CN105466845A - Supercritical equipment and corrosion monitoring method thereof - Google Patents
Supercritical equipment and corrosion monitoring method thereof Download PDFInfo
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Abstract
The invention discloses supercritical equipment and a corrosion monitoring method thereof, relates to the technical field of equipment corrosion monitoring and aims to solve the problems that the corrosion condition of a liner in existing supercritical equipment cannot be accurately judged in the actual use process of the supercritical equipment. The supercritical equipment comprises an equipment casing and the liner in the equipment casing, wherein the liner comprises a middle protecting layer, a middle indicating layer and a corrosion resistance layer from outside to inside sequentially, the middle indicating layer at least contains one characteristic element, and the characteristic element can be dissolved in a medium carried in the supercritical equipment when the middle indicating layer is corroded. The supercritical equipment corrosion monitoring method can be used for monitoring the corrosion condition of the liner in the supercritical equipment. The supercritical equipment is used for providing a reaction field for a supercritical reaction.
Description
Technical field
The present invention relates to equipment corrosion monitoring technical field, particularly relate to a kind of overcritical equipment and corrosion monitoring process thereof.
Background technology
Along with improving constantly of quality of life, municipal wastewater, the pollutants such as industrial sludge are also corresponding to be increased, and process the supercritical Water Oxidation Technology that these pollutants apply and need at high temperature (being greater than 500 DEG C), carry out under the reaction conditions that high pressure (being greater than 23MPa) etc. are harsh, under this reaction conditions, the medium that overcritical device interior contains can cause certain corrosion and wearing and tearing to the liner of overcritical equipment, when the corrosion of the liner of overcritical equipment or the degree of wearing and tearing more serious time, overcritical equipment will be there is break suddenly, the even security incident such as blast, therefore, to the design of inner lining structure in overcritical equipment, and to the monitoring of overcritical equipment use situation be always chemical enterprise pay close attention to focus.
At present; liner in overcritical equipment generally comprises anti-corrosion layer and intermediate protective layer; and the liner of this structure is in the process used; be merely able to record its average corrosion rate; judge the corrosion condition of liner again according to average corrosion rate, so just easily occur that the corrosion condition of liner can not by the problem accurately judged.
Summary of the invention
The object of the present invention is to provide a kind of overcritical equipment and corrosion monitoring process thereof, for solving existing overcritical equipment in actual use, the corrosion condition of the liner of overcritical equipment can not by the problem accurately judged.
To achieve these goals, the invention provides following technical scheme:
A kind of overcritical equipment, comprising: apparatus casing and be located at the liner of described apparatus casing inside; Wherein, described liner comprises intermediate protective layer, middle marker and anti-corrosion layer from outside to inside successively; at least containing a kind of characteristic element in described middle marker, described characteristic element is for can element in the medium that contains to described overcritical device interior of stripping when described middle marker is corroded.
The present invention also provides a kind of overcritical equipment corrosion monitoring method, and for monitoring the corrosion condition of the liner of above-mentioned overcritical equipment, described overcritical equipment corrosion monitoring method comprises the following steps:
Step 101, according to element kind contained in element kind contained in described middle marker and described anti-corrosion layer, determine the characteristic element that will monitor, described characteristic element is for can element in the medium that contains to described overcritical device interior of stripping when described middle marker is corroded;
Step 102, monitors the content of characteristic element described in medium that described overcritical device interior contains;
Step 103, judges the extent of corrosion of described liner according to the change of the content of characteristic element described in the medium that described overcritical device interior contains.
Compared with prior art, beneficial effect of the present invention is:
In overcritical equipment provided by the invention, along with the carrying out of the supercritical reaction of its inside, the medium that overcritical device interior contains can successively by anti-corrosion layer, middle marker and intermediate protective layer corrosion failure; After anti-corrosion layer is corroded inefficacy, when the medium that overcritical device interior contains starts to corrode middle marker, owing at least containing a kind of characteristic element in middle marker, and when middle marker is corroded, characteristic element can in the medium that contains to overcritical device interior of stripping, and in the medium that overcritical device interior is contained, the content of characteristic element changes; Like this along with the extent of corrosion of middle marker strengthens, in the different corrosion stages, in the medium that overcritical device interior contains, the content of characteristic element can be different; Therefore, in the use procedure of overcritical equipment, only need monitor the change of characteristic element content in the medium that its inside contains, just can judge the corrosion condition of the liner of overcritical equipment accurately.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a part of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
The structural representation of the liner of the overcritical equipment that Fig. 1 provides for the embodiment of the present invention;
The process flow diagram of the overcritical equipment corrosion monitoring method that Fig. 2 provides for the embodiment of the present invention.
Reference numeral:
1-intermediate protective layer, marker in the middle of 2-,
3-anti-corrosion layer.
Embodiment
In order to further illustrate the overcritical equipment and corrosion monitoring process thereof that the embodiment of the present invention provides, be described in detail below in conjunction with Figure of description.
Refer to Fig. 1, the overcritical equipment that the embodiment of the present invention provides comprises: apparatus casing and be located at the liner of apparatus casing inside; Wherein, liner comprises intermediate protective layer 1, middle marker 2 and anti-corrosion layer 3 from outside to inside successively; at least containing a kind of characteristic element in middle marker 2, characteristic element is for can element in the medium that contains to overcritical device interior of stripping when middle marker 2 is corroded.
Above-mentioned overcritical equipment in use, the raw material carried out needed for supercritical reaction is joined overcritical device interior, and the high temperature, the condition of high voltage that the environmental baseline of overcritical device interior are set to needed for supercritical reaction, supercritical reaction is carried out smoothly at overcritical device interior; And along with the carrying out of supercritical reaction, the content of the characteristic element in the medium that staff can contain overcritical device interior is monitored, according to the change of characteristic element content in the medium that overcritical device interior contains, judge the corrosion condition of the liner of overcritical equipment.
In the overcritical equipment that the present embodiment provides, along with the carrying out of the supercritical reaction of its inside, the medium that overcritical device interior contains can successively by anti-corrosion layer 3, middle marker 2 and intermediate protective layer 1 corrosion failure; After anti-corrosion layer 3 is corroded inefficacy, when the medium that overcritical device interior contains starts to corrode middle marker 2, owing at least containing a kind of characteristic element in middle marker 2, and when middle marker 2 is corroded, characteristic element can in the medium that contains to overcritical device interior of stripping, and in the medium that overcritical device interior is contained, the content of characteristic element changes; Like this along with middle marker 2 is corroded the increasing of degree, in the different corrosion stages, in the medium that overcritical device interior contains, the content of characteristic element can be different; Therefore, in the use procedure of overcritical equipment, only need monitor characteristic element content in the medium that its inside contains, just can judge the corrosion condition of the liner of overcritical equipment accurately.
In addition; above-mentioned intermediate protective layer 1 also has certain corrosion resistivity; when middle marker 2 is corroded inefficacy, intermediate protective layer 1 can play certain protective action, and the phenomenon of leaking suddenly appears in the overcritical equipment caused to avoid generation apparatus casing to be corroded.
In the liner of above-mentioned overcritical equipment; auxiliary separation layer can also be provided with between apparatus casing and intermediate protective layer 1; and/or; auxiliary separation layer is provided with between intermediate protective layer 1 and middle marker 2; and/or; between middle marker 2 and anti-corrosion layer 3, be provided with auxiliary separation layer, and auxiliary separation layer comprises at least one deck intermediate protective layer 1 and/or at least middle marker 3 of one deck.Because auxiliary separation layer comprises at least one deck intermediate protective layer 1 and/or at least middle marker 2 of one deck; overcritical equipment can be made to there is multiple different inner lining structure; below provide two all concrete inner lining structures, be described in detail with the different beneficial effects produced the liner of different structure.
When at least one deck intermediate protective layer 1 be provided with in above-mentioned three positions and/or at least marker 2 in the middle of one deck, when making to comprise successively from outside to inside in liner the middle marker 2 of at least one deck intermediate protective layer 1, at least one deck and anti-corrosion layer 3, be equivalent to the thickness having thickeied intermediate protective layer 1 and/or middle marker 2; In this case, because the thickness of the intermediate protective layer 1 in liner and/or middle marker 2 is thickening, just make the resistance to corrosion of intermediate protective layer 1 and/or middle marker 2 stronger, extend the serviceable life of overcritical equipment accordingly.
When at least one deck intermediate protective layer 1 be provided with in above-mentioned three positions and/or at least marker 2 in the middle of one deck, liner is made to comprise one deck anti-corrosion layer 3, marker 2 and multilayer intermediate protective layer 1 in the middle of multilayer, and when in the middle of multilayer, marker 2 and multilayer intermediate protective layer 1 interval are arranged, along with the carrying out of supercritical reaction in overcritical equipment, the medium that overcritical device interior contains can carry out corrosion one by one to by marker 2 in the middle of spaced multilayer, and marker 2 in the middle of every corresponding corrosion one deck, characteristic element in middle marker 2 will be dissolved in the medium that overcritical device interior contains, in the medium that overcritical device interior is contained, the content of characteristic element constantly changes, staff can carry out Real-Time Monitoring by the content of the characteristic element in the medium that contains overcritical device interior, to obtain the corrosion condition of liner in the differential responses stage of overcritical equipment, in addition, due in this case, add intermediate protective layer 1 and/or middle marker 2, make the thickness of liner become thicker accordingly, so just make overcritical equipment have longer serviceable life.
It should be noted that, the liner of overcritical equipment is not limited only to above-mentioned two kinds of concrete structures, and no matter liner selects any structure, all at least there is the effect extending overcritical service life of equipment, more excellent, staff can also be made to understand the corrosion condition of liner in the differential responses stage of overcritical equipment.
Due to overcritical equipment in actual use, for the different supercritical reactions that its inside is carried out, overcritical equipment can the corresponding liner selecting unlike material, has stronger corrosion resistivity to enable the liner of overcritical equipment; Therefore, can there is multiple possibility in the material of the liner of overcritical equipment.When the housing selecting chrome-molybdenum steel as overcritical equipment, intermediate protective layer in liner selects the welding coefficient between chrome-molybdenum steel can reach the Inconel625 alloy of 80%, elect the material of middle marker as 12Cr2Mo1V alloy, and 12Cr2Mo1V alloy belongs to Mayari, under room temperature and high temperature, there is good mechanical property, elect the material of anti-corrosion layer as Inconel625 alloy, and Inconel625 alloy has stronger inorganic acid resistance corrosive nature, according to all elements included in 12Cr2Mo1V alloy, Fe can be judged, Mo, V tri-kinds of elements can in the medium that contains to overcritical device interior of stripping, in the medium that overcritical device interior is contained, the content of characteristic element changes, therefore, when using 12Cr2Mo1V alloy as middle marker 2, can determine that characteristic element is Fe, Mo, V.In addition, assign to from the element set of 12Cr2Mo1V alloy and Inconel625 alloy, both containing Mo element, Mo is very important alloying element in refractory steel, can significantly improve the thermostrength of steel, keeps enough intensity when high temperature, and energy crystal grain thinning, prevent the overheated tendency of steel.
When the material of middle marker elects C-276 (Hastelloy) as, C-276 is in the environment of supercritical reaction, there is stronger decay resistance, and to wet chlorine, various oxidisability chloride, chlorate solution, sulfuric acid and oxidisability salt etc., all there is good corrosion resisting property, when electing the material of anti-corrosion layer as Inconel625 alloy, owing to not containing W in Inconel625, and only containing the Co seldom measured, can judging characteristic element be W and Co.
Refer to Fig. 2, the embodiment of the present invention additionally provides the corrosion monitoring process of above-mentioned overcritical equipment, and for monitoring the corrosion condition of the liner of above-mentioned overcritical equipment, overcritical equipment corrosion monitoring method comprises the following steps:
Step 101, according to element kind contained in element kind contained in middle marker 2 and anti-corrosion layer 3, determine the characteristic element that will monitor, described characteristic element is for can element in the medium that contains to overcritical device interior of stripping when middle marker 2 is corroded; Concrete, due to overcritical equipment in actual use, the material of its liner can exist multiple may; To in the actual monitoring process of overcritical equipment, need element kind contained in the middle marker 2 in clear and definite liner, and the element kind contained by anti-corrosion layer 3, according to these element kinds, find out at least one characteristic element existing in middle marker 2, and the change of content in the medium that contains at overcritical device interior of characteristic element, the extent of corrosion of liner can be reflected.
Step 102, monitors the content of characteristic element in the medium that overcritical device interior contains; In more detail, along with continuing to increase of extent of corrosion, when middle marker 2 is corroded, characteristic element in middle marker 2 can in the medium that contains to overcritical device interior of continuous stripping, the content of the characteristic element in the medium that overcritical device interior is contained changes, and the medium in overcritical equipment can take out by staff from equipment, and it is carried out to the detection of characteristic element content, monitor with the content realizing characteristic element in the medium that contains overcritical device interior; Certainly, the method for monitoring characteristic element in the medium that overcritical device interior contains is not limited only to this.
Step 103, judges the extent of corrosion of liner according to the change of the content of characteristic element in the medium that overcritical device interior contains; Further, due to the stripping quantity in the medium that the overcritical device interior of selected characteristic element in overcritical equipment contains, the extent of corrosion of liner can be reflected; Therefore, by the result monitored in above-mentioned steps 102, the extent of corrosion of the liner of overcritical equipment just accurately can be judged.
In the overcritical equipment corrosion monitoring method that the present embodiment provides, by monitoring the situation of change of the content of characteristic element in medium that overcritical device interior contains, just can judge the corrosion condition of the liner of overcritical equipment accurately.
It should be noted that, above-mentioned overcritical device interior has contained polytype medium, comprising supercritical water, because supercritical water itself is only containing protium and oxygen element, can not impact the monitoring of characteristic element, and in observation process, only supercritical water need be taken out from overcritical equipment and detect, simple to operation, therefore, preferably, select supercritical water as the medium that will monitor, and according to the content of characteristic element in supercritical water, judge the extent of corrosion of liner.
In addition, in above-mentioned steps 103, when the content of characteristic element in the medium contained according to overcritical device interior judge anti-corrosion layer 3 be corroded lost efficacy time, staff can stop the use of overcritical equipment, to prevent the problem that the overcritical equipment that caused by pitch corrosion is in use revealed suddenly.
Owing to may there is various features element in middle marker 2, in actual monitoring process, staff, in order to save monitoring time, improves monitoring efficiency, wherein one or both characteristic elements generally can be selected to carry out actual monitoring; And when selecting the characteristic element that will monitor, also need to consider the element kind in anti-corrosion layer 3, and the kind of medium that overcritical device interior contains, when these factors comprehensive, staff just can determine the characteristic element finally will monitored; Below for different situations, provide in step 101, specifically determine mode for two kinds of characteristic element.
First kind of way, when characteristic element comprises the first element, and in anti-corrosion layer and the medium that contains of overcritical device interior itself all containing the first element time, determine the characteristic element of the first element for monitoring, due in anti-corrosion layer 3 and the medium that contains of overcritical device interior itself all not containing the first element, the content of the first element in this medium just making overcritical device interior contain is only relevant to the extent of corrosion of middle marker 2, namely when middle marker 2 is not also corroded, not containing the first element in the medium that overcritical device interior contains, first element is merely able to derive from middle marker 2, so in step 103, as long as just can determine to contain the first element in the medium that overcritical device interior contains, just illustrate that anti-corrosion layer 3 has been corroded inefficacy, and middle marker 2 is corroded.
Further, in order to the result making judgement is more accurate, in step 103, when the content of monitoring the first element in the medium that excess of export marginal devices inside contains reaches the detection limit of used monitoring equipment, judge that anti-corrosion layer 3 lost efficacy, and stop the use of overcritical equipment.Because monitoring equipment self has detection limit, the concrete content of characteristic element that namely monitoring equipment is monitored should be greater than detection limit as far as possible, and such monitoring equipment can the content of monitoring feature element more accurately.
The second way, when characteristic element comprises the second element, and when also comprising the second element in anti-corrosion layer, determines the characteristic element of the second element for monitoring.Due to overcritical equipment in different environments, the material of the liner of its inside is different, therefore can not ensure in liner used each time, element contained by middle marker 2, the medium itself that anti-corrosion layer 3 and overcritical device interior contain all does not contain, like this when selecting characteristic element, consider according to actual conditions with regard to needs, in the medium that selected characteristic element contains at overcritical device interior, content should be able to reflect the corrosion condition of liner accurately, and can not be subject to the impact of other factors.
It should be noted that, to in the actual monitoring process of characteristic element, be not limited only to monitor a kind of characteristic element, and when monitoring various features element, by compared with the concentration of characteristic element more stable to the concentration of characteristic element larger for content amplitude and content, the extent of corrosion of the liner of overcritical equipment can also be judged according to the ratio obtained; Certainly, be not limited only to this method according to ratio in judgement extent of corrosion, as long as accurately can judge that the method for liner corrosion condition all can adopt.In addition, in order to make monitoring result more accurate, when monitoring the second element, the kind of the second element is not limited only to one, can monitor multiple second element simultaneously, then weighs the extent of corrosion of liner of overcritical equipment according to monitoring result.
In the liner of above-mentioned overcritical equipment, auxiliary separation layer is provided with between apparatus casing and intermediate protective layer 1, and/or, auxiliary separation layer is provided with between intermediate protective layer 1 and middle marker 2, and/or, auxiliary separation layer is provided with between middle marker 2 and anti-corrosion layer 3, and auxiliary separation layer comprises at least one deck intermediate protective layer 1 and/or at least in the middle of one deck during marker 3, liner can be made to occur multiple different structure, and for the liner of different structure, can there are some difference in corresponding adopted overcritical equipment corrosion monitoring method; Due to intermediate protective layer 1 may be there is in the inner side of middle marker 2; this just makes the element kind in intermediate protective layer 1 also can produce certain impact to the selection of characteristic element; so in a step 101; just need according to element kind contained in element kind contained in element kind contained in intermediate protective layer 1, middle marker 2 and anti-corrosion layer 3; determine the characteristic element that will monitor, can ensure that selected characteristic element accurately can reflect that condition is asked in the corrosion of liner like this.
In order to the specific implementation process of the overcritical equipment corrosion monitoring method that the clearer description embodiment of the present invention provides, below provide preferred embodiment:
Embodiment one:
The material of the apparatus casing of overcritical equipment is 12Cr2Mo1V, and the material of intermediate protective layer 1 is Inconel625 alloy, and the material of middle marker 2 is 12Cr2Mo1V, and the material of anti-corrosion layer 3 is Inconel625 alloy.Concrete, 12Cr2Mo1V belongs to Mayari, under room temperature and hot environment, have better mechanical property, and its main alloying element has molybdenum, chromium, vanadium, silicon and boron etc.; Inconel625 belongs to nickel-base alloy, and have outstanding anti-mineral acid corrosive power, its principal ingredient has Ni, Cr, Mo, Fe, Nb.
According to the element comprised respectively in 12Cr2Mo1V and Inconel625 alloy, the characteristic element obtaining 12Cr2Mo1V is mainly Fe, Mo, V; And in these three kinds of characteristic elements, can determine that Fe and Mo contains equally in Inconel625 alloy, and V does not contain in Inconel625 alloy; Therefore, a kind of element V can be chosen as the characteristic element that will monitor, or choose together with Fe with Mo as the characteristic element that will monitor.
When selection V is as the characteristic element that will monitor, and when not containing V in the medium of participation supercritical reaction, along with the operation of overcritical equipment, anti-corrosion layer 3 in the liner of overcritical equipment can owing to being subject to general corrosion or pitch corrosion and the inefficacy that is corroded, after anti-corrosion layer 3 is corroded and lost efficacy, supercritical water in overcritical equipment directly contacts with middle marker 2, and middle marker 2 is corroded, in the process of corrosion, V in 12Cr2Mo1V can be dissolved in supercritical water, makes this not occur V element containing in the supercritical water of V; Like this in the process that supercritical water is monitored, if monitor out the anti-corrosion layer 3 that can judge in liner containing V in supercritical water to be corroded inefficacy, staff can stop the operation of overcritical equipment, with the phenomenon of preventing the overcritical equipment occurring to be caused by pitch corrosion or general corrosion to reveal suddenly.More excellent, if in observation process in supercritical water the content of V beyond the detectability of monitoring equipment, then judge that anti-corrosion layer 3 is corroded inefficacy, middle marker 2 there occurs corrosion.
When selecting Fe and Mo as the characteristic element that will monitor, the content of these two kinds of elements in supercritical water can be monitored out, consider that the comparision contents of Ni in supercritical water is stablized, in order to judge the corrosion condition of liner more easily according to monitoring result, can monitor out respectively Fe and Mo respectively with the concentration ratio of Ni, then judge the extent of corrosion of liner of overcritical equipment according to ratio.
Experimentally can verify, as Mo/Ni < 8 and Fe/Ni < 7 time, or V element concentration more than 0.05mg/L time, be optimal conditions equipment being carried out to parking maintenance.
Below to meeting Mo/Ni < 8 and correlativity between the Rule of judgment of Fe/Ni < 7 and the Rule of judgment meeting V > 0.05mg/L is verified.
Select the gross thickness of the liner of overcritical equipment to be 5mm, wherein, the thickness of anti-corrosion layer 3 is 2.5mm, and the thickness of middle marker 2 is 1.5mm, and the thickness of intermediate protective layer 1 is 1mm.The environmental baseline of carrying out supercritical reaction is set to 500 DEG C, the environment of containing sulfate, phosphate, hydrochloride, and the alarm limit of V is set to 0.05mg/L (when the concentration of monitoring out V is more than 0.05mg/L, stop test), monitor out the ion concentration of Fe, Mo, Ni in supercritical water, and conversion is concentration ratio.
Total testing time is divided into 5 stages, different according to the concentration of the various ions chosen in overcritical equipment, carry out following three groups of tests respectively:
Test one: choose NaCl concentration 2.0g/L, Na2SO4 concentration 2.0g/L, Na3PO4 concentration 2.0g/L, pH=4.When the concentration of V exceedes alarm limit, stop test.
| 500h | 1000h | 1500h | 2000h | 2321h | |
| Fe(mg/L) | 0.235 | 0.276 | 0.193 | 0.155 | 0.114 |
| Mo(mg/L) | 0.412 | 0.377 | 0.256 | 0.195 | 0.128 |
| V(mg/L) | 0.007 | 0.003 | ＜0.001 | ＜0.001 | 0.055 |
| Ni(mg/L) | 0.015 | 0.018 | 0.014 | 0.021 | 0.017 |
| Fe/Ni | 15.67 | 15.33 | 13.79 | 7.38 | 6.71 |
| Mo/Ni | 27.47 | 20.94 | 18.29 | 9.29 | 7.53 |
Table 1
After test, find that liner is comparatively even at the extent of corrosion of diverse location with defectoscope, the thinnest position thickness of liner is 1.2mm, and the thickest position thickness of liner is 2.7mm, and this test has judged test stand-by time exactly before middle marker 2 eating thrown.According to the data display in table 1, when 2321h, the concentration of V reaches 0.055mg/L, Fe/Ni=6.71 and Mo/Ni=7.53, demonstrates the alarm limit of V and the correlativity of Mo/Ni, Fe/Ni ratio.
Test two: choose NaCl concentration 2.0g/L, Na2SO4 concentration 2.0g/L, Na3PO4 concentration 2.0g/L, pH=1.When V concentration exceed alarm limit time, stop test.
| 500h | 1000h | 1136h 6 --> | |
| Fe(mg/L) | 10.228 | 6.859 | 6.103 |
| Mo(mg/L) | 15.377 | 8.912 | 8.37 |
| V(mg/L) | 0.001 | ＜0.001 | 0.051 |
| Ni(mg/L) | 0.976 | 1.128 | 1.125 |
| Fe/Ni | 10.48 | 6.08 | 5.42 |
| Mo/Ni | 15.76 | 8.21 | 7.44 |
Table 2
After test; find that liner is obvious in the extent of corrosion gap of diverse location with defectoscope; the thinnest position thickness of liner is 0.9mm; the thickest position thickness of liner is 3.6mm; this phenomenon is obvious pitch corrosion; and this test has judged risk exactly when corroding and just having occurred in intermediate protective layer 1, and stopped test in time.According to the data display in table 2, when 1136h, the concentration of V reaches 0.051mg/L, Fe/Ni=5.42 and Mo/Ni=7.44, demonstrates the alarm limit of V and the correlativity of Mo/Ni, Fe/Ni ratio.
Based on the test findings of above-mentioned test one and test two, can find as Mo/Ni < 8 and Fe/Ni < 7 time, can judge that anti-corrosion layer 3 lost efficacy.In order to verify this conclusion, choosing one group of V below and do not exceed alarming line but meet Mo/Ni < 8 and the test figure of Fe/Ni < 7 condition is analyzed.
Test three: choose NaCl concentration 4.0g/L, Na2SO4 concentration 4.0g/L, Na3PO4 concentration 4.0g/L, pH=4.
| 500h | 1000h | 1500h | 1766h | |
| Fe(mg/L) | 0.834 | 0.772 | 0.495 | 0.408 |
| Mo(mg/L) | 1.209 | 1.047 | 0.618 | 0.592 |
| V(mg/L) | 0.002 | 0.003 | ＜0.001 | ＜0.001 |
| Ni(mg/L) | 0.062 | 0.067 | 0.053 | 0.081 |
| Fe/Ni | 13.45 | 11.52 | 9.34 | 5.04 |
| Mo/Ni | 19.50 | 15.63 | 11.66 | 7.31 |
Table 3
After test, find that with defectoscope the thinnest position thickness of liner is 1.3mm, the thickest position thickness of liner is 3.1mm.This test has judged test stand-by time exactly before middle marker 2 is corroded inefficacy.According to the data display in table 3, when 1766h, the concentration of V is less than 0.001, and now Fe/Ni=5.04 and Mo/Ni=7.31, demonstrate as Mo/Ni < 8 and Fe/Ni < 7 time, can judge that anti-corrosion layer 3 lost efficacy.
In the description of above-mentioned embodiment, specific features, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (10)
1. an overcritical equipment, is characterized in that, comprising: apparatus casing and be located at the liner of described apparatus casing inside; Wherein,
Described liner comprises intermediate protective layer, middle marker and anti-corrosion layer from outside to inside successively; at least containing a kind of characteristic element in described middle marker, described characteristic element is for can element in the medium that contains to described overcritical device interior of stripping when described middle marker is corroded.
2. overcritical equipment according to claim 1, is characterized in that,
Auxiliary separation layer is provided with between described apparatus casing and described intermediate protective layer;
And/or, between described intermediate protective layer and described middle marker, be provided with auxiliary separation layer;
And/or be provided with auxiliary separation layer between described middle marker and described anti-corrosion layer, described auxiliary separation layer comprises at least intermediate protective layer described in one deck and/or at least middle marker described in one deck.
3. overcritical equipment according to claim 1 and 2, is characterized in that, when the material of described middle marker is 12Cr2Mo1V alloy, when the material of described anti-corrosion layer is Inconel625 alloy, described characteristic element is Fe, Mo and V;
When the material of described middle marker is C-276 alloy, when the material of described anti-corrosion layer is Inconel625 alloy, described characteristic element is W and Co.
4. an overcritical equipment corrosion monitoring method, is characterized in that, for monitoring the corrosion condition of the liner of overcritical equipment described in claim 1, described overcritical equipment corrosion monitoring method comprises the following steps:
Step 101, according to element kind contained in element kind contained in described middle marker and described anti-corrosion layer, determine the characteristic element that will monitor, described characteristic element is for can element in the medium that contains to described overcritical device interior of stripping when described middle marker is corroded;
Step 102, monitors the content of characteristic element described in medium that described overcritical device interior contains;
Step 103, judges the extent of corrosion of described liner according to the change of the content of characteristic element described in the medium that described overcritical device interior contains.
5. overcritical equipment corrosion monitoring method according to claim 4, it is characterized in that, in described step 103, when the content of characteristic element described in the medium contained according to described overcritical device interior judge described anti-corrosion layer be corroded lost efficacy time, stop the use of described overcritical equipment.
6. the overcritical equipment corrosion monitoring method according to claim 4 or 5, it is characterized in that, when described characteristic element comprises the first element, and in described anti-corrosion layer and the medium that contains of described overcritical device interior itself all containing described first element time, in described step 101, determine the characteristic element of described first element for monitoring;
In described step 103, when monitoring out in the medium that described overcritical device interior contains containing described first element, judge that described anti-corrosion layer is corroded inefficacy.
7. the overcritical equipment corrosion monitoring method according to claim 4 or 5, it is characterized in that, in described step 103, when the content of monitoring out the first element described in medium that described overcritical device interior contains reaches the detection limit of used monitoring equipment, judge that described anti-corrosion layer is corroded inefficacy.
8. the overcritical equipment corrosion monitoring method according to claim 4 or 5, it is characterized in that, when described characteristic element comprises the second element, and when also comprising described second element in described anti-corrosion layer, in described step 101, determine the characteristic element of described second element for monitoring.
9. overcritical equipment corrosion monitoring method according to claim 8, is characterized in that, at least comprises two kinds of described second elements in described characteristic element.
10. overcritical equipment corrosion monitoring method according to claim 4, is characterized in that,
Auxiliary separation layer is provided with between described apparatus casing and described intermediate protective layer;
And/or, between described intermediate protective layer and described middle marker, be provided with auxiliary separation layer;
And/or be provided with auxiliary separation layer between described middle marker and described anti-corrosion layer, described auxiliary separation layer comprises at least intermediate protective layer described in one deck and/or at least middle marker described in one deck;
When the inner side of described middle marker is provided with described intermediate protective layer; in described step 101; according to element kind contained in element kind contained in element kind contained in described intermediate protective layer, described middle marker and described anti-corrosion layer, determine the characteristic element that will monitor.
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| CN111455286A (en) * | 2020-04-09 | 2020-07-28 | 宁波万冠熔模铸造有限公司 | Marine fitting with corrosion indicator layer and method of making same |
| CN114574849A (en) * | 2021-12-16 | 2022-06-03 | 西安交通大学 | Method for improving corrosion resistance of Inconel 625 alloy in oxygen-containing supercritical water |
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