CN102944647A - Measuring device and method for air quality in fermenting room - Google Patents

Abstract

The invention discloses a measuring device and method for air quality in a fermenting room, relating to an air quality measurement technique and device in high temperature and high humidity environments. The device is characterized by arranging a plurality of sampling pipes in the fermenting room, introducing the air in the fermenting room into an enclosed box by a sampling fan, wherein the enclosed box is successively provided with a temperature sensor, a heating unit, a temperature and humidity sensor and a dynamic sampling fan. The method is characterized by using the temperature sensor to measure the temperature of the sampled air before heating, then using the temperature and humidity sensor to measure the temperature and the humidity after heating, then using formulas to calculate the moisture content of the sampled air, and calculating the relative humidity according to the moisture content and the temperature before heating, that is, the relative humidity in the fermenting room. According to the invention, the problems of short service life and low measurement precision of common temperature and humidity sensors used in long-term high humidity environment in the fermenting room are solved; by using the device and the method, the service life of temperature and humidity measurement devices can be more than 8-10 times longer, and the precision of the humidity measurement is raised by about 2%.

Description

A kind of measurement mechanism and method for fermenting cellar surrounding air quality

Technical field

The present invention relates to air quality is measured under a kind of hot and humid environment method and device, relate in particular to method and the device of fermentation indoor air quality measurement, belong to the field that indoor air quality detects and controls.

Background technology

The processing link that all has fermentation in the food processing process such as beer, liquor, bread, tobacco, the fermentation indoor temperature reaches as high as 60 ℃, and humidity can arrive more than 95%, and the detection of the temperature in the fermenting cellar, humidity etc. is to the zymotechnique important in inhibiting.In the existing technology, indoor air quality is mainly realized indoor temperature, the isoparametric detection of humidity by being installed on indoor various sensors, transmitter.And these conventional surveying instruments all are difficult to adapt to the long-time high temperature that occurs, the environment of high humidity in the sweat.On the one hand, in the hot and humid environment, when temperature changed slightly, just easy dewfall was installed on indoor Temperature Humidity Sensor and belongs to electronic product on wall or the indoor object, and there is circuit board transmitter inside, in case dewfall just is easy to damage.On the other hand, temperature measurement probe can directly contact with room air, conduction by heat can realize temperature survey, but humidity-measuring probe must directly contact with air, in the high humidity environment, measure the easily larger drift of generation of sensor probe humidity-sensitive element (hygristor or humicap) that humidity is used.For these reasons, at present in the hot and humid environment measurement such as temperature, humidity basically all can't stablize, reliably realization, perhaps serviceable life very short (about 3 months) thus maintenance cost is very high.

Summary of the invention

The object of the present invention is to provide a kind of method and device for fermenting cellar surrounding air quality measurement, can be for a long time, stable, reliable measurements hot and humid environment Air quality, to remedy the deficiency that conventional Temperature Humidity Sensor can't long-term stable operation hot and humid environment in such as fermenting cellar.

Technical scheme of the present invention is as follows:

A kind of for fermenting cellar surrounding air quality measurement device, it is characterized in that: this device comprises airtight casing, indoor sampled air inlet tube, the first temperature sensor, heater block, Temperature Humidity Sensor, air sampling driven fan, sampled air efferent duct and micro computer disposal system; Indoor sampled air inlet tube and sampled air efferent duct are separately positioned on the airtight casing, and described the first temperature sensor, heater block, Temperature Humidity Sensor and air sampling driven fan are arranged in the airtight casing; The first temperature sensor is arranged between indoor sampled air inlet tube and the heater block and close indoor sampled air entrance; Temperature Humidity Sensor is arranged between heater block and the sampled air efferent duct; The first temperature sensor, heater block, Temperature Humidity Sensor and air sampling driven fan are connected by signal wire and are connected with the micro computer disposal system.

Technical characterictic of the present invention also is: also be disposed with cooling-part and the second temperature sensor in airtight casing, cooling-part and the second temperature sensor are arranged between Temperature Humidity Sensor and the air efferent duct.Described sampled air efferent duct is connected with fermenting cellar by pipeline

Another technical characterictic of the present invention is: also be provided with equal flow filter in airtight casing, this current-sharing filter arrangement is in the front of the first temperature sensor, and close indoor sampled air porch.

A kind of measuring method for fermenting cellar surrounding air quality provided by the invention is characterized in that the method comprises the steps:

1) arranges several air sampling tubes in the fermenting cellar, sampled air is sent in the seal case, utilize the temperature sensor that is arranged in the seal case that sampled air is detected, obtain adopting the temperature of air, i.e. air themperature t in the fermenting cellar ₁

2) by the heater block that is arranged in the temperature sensor back sampled air is heated, then utilize sampled air temperature t 2 and relative humidity Φ 2 after Temperature Humidity Sensor records heating; Make the relative humidity of the sampled air after the heating be reduced to 60% to 70%;

3) utilize following formula and calculate water capacity d after the heating by the micro computer disposal system ₂:

${\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="HDA00002351145700011.png"\; state="\{\{state\}\}">d</figure-callout>}}_2=622\&times;\frac{P_{q2}}{P_a-{\mathrm{<figure-callout\; id="2"\; label="P\; q"\; filenames="HDA00002351145700011.png"\; state="\{\{state\}\}">P</figure-callout>}}_q}...\left(I\right)$

Wherein: P _Q2=φ ₂* P _Qb2(II)

$P_{q\&CenterDot;\mathrm{<figure-callout\; id="2"\; label="b"\; filenames="HDA00002351145700011.png"\; state="\{\{state\}\}">b</figure-callout>}2}={2.718}^{(\frac{-5800.2206}{{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA00002351145700011.png"\; state="\{\{state\}\}">t</figure-callout>}}_2+273.15}+1.3914993-0.04860239\&times;({\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA00002351145700011.png"\; state="\{\{state\}\}">t</figure-callout>}}_2+273.15)+\frac{0.41764768\&times;{({\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA00002351145700011.png"\; state="\{\{state\}\}">t</figure-callout>}}_2+273.15)}^2}{10000}-\frac{0.14452093\&times;{({\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA00002351145700011.png"\; state="\{\{state\}\}">t</figure-callout>}}_2+273.15)}^3+6.5459673\&times;\ln ({\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA00002351145700011.png"\; state="\{\{state\}\}">t</figure-callout>}}_2+273.15)}{10000000})...\left(\mathrm{III}\right)}$

In the above-mentioned formula:

P _Qb2T ₂Saturated vapor partial pressure under the temperature, unit are Pa;

t ₂Sampled air temperature after the heating, unit is ℃;

P _Q2T ₂Partial pressure of water vapor under the temperature, unit are Pa;

P _aAtmospheric pressure, unit are Pa;

d ₂Heating post-sampling air humidity content, unit is g/kg;

4) water capacity according to sampled air before and after the heating equates d ₁=d ₂, obtain heating the water capacity d of front sampled air ₁

5) utilize following formula also by the relative humidity before the micro computer disposal system calculating sampling air heat, i.e. relative humidity Φ in the fermenting cellar ₁:

${\mathrm{\&phi;}}_1=\frac{P_{q1}}{P_{q\&CenterDot;b1}}...\left(\mathrm{IV}\right)$

$P_{q1}=\frac{d_1\&times;P_a}{d_1+622}...\left(V\right)$

$P_{q\&CenterDot;b1}={2.718}^{(\frac{-5800.2206}{t_1+273.15}+1.3914993-0.04860239\&times;(t_1+273.15)+\frac{0.41764768\&times;{(t_1+273.15)}^2}{10000}-\frac{0.14452093\&times;{(t_1+273.15)}^3+6.5459673\&times;\ln (t_1+273.15)}{10000000})...\left(\mathrm{VI}\right)}$

In the above-mentioned formula:

P _Qb1T ₁Saturated vapor partial pressure under the temperature, unit are Pa;

t ₁Sampled air temperature ℃ before the heating;

P _Q1T ₁Partial pressure of water vapor under the temperature, unit are Pa;

P _aAtmospheric pressure, unit are Pa;

d ₁Sampled air water capacity before the heating, unit is g/kg;

The measuring method that another kind provided by the invention is used for fermenting cellar surrounding air quality is: based on the above method, arrange successively cooling-part and the second temperature sensor in the Temperature Humidity Sensor back, by cooling-part the sampled air after heating is cooled off, utilized the second temperature sensor to detect cooled temperature t ₃Compare the temperature that the first temperature sensor and the second temperature sensor detect, according to the difference of two temperature, regulate the cooling power of cooling-part, until the temperature t that the second temperature sensor detects ₃Equal the temperature t that the first temperature sensor detects ₁At this moment the sampled air state has namely returned to the air condition in the fermenting cellar; Then this sampled air is sent back in the fermenting cellar.

The present invention compared with prior art, have the following advantages and the high-lighting effect: 1. the present invention is owing to being equipped with one of the introducing of the air in the fermenting cellar successively in the airtight casing of temperature sensor, heater block, Temperature Humidity Sensor and power sampling blower fan, sampled air is constant by the rear water capacity of heating, and relative humidity reduces, therefore moisture measurement need to not detect under high humidity environment, has avoided easily drift of humidity-sensitive element (hygristor or humicap), dewfall damage and the measuring accuracy of the sensor that measurement humidity is used in high humidity environment to reduce the problem that waits.2. Temperature Humidity Sensor is different in different temperature humidity range interval measure precision, the present invention is by the heat that adds of control heater block, can control temperature and relative humidity behind the heater block, carry out so that the temperature and humidity measurement after the heating remains in the highest interval of sensor accuracy.3. the cooling power by the control cooling-part can be cooled to the fermenting cellar indoor temperature again with sampled air, even sampled air returns to the state before the sampling processing again, and send back in the room by thermo-insulating pipe line, avoided extracting sampled air to the interference of indoor temperature, humidity, pressure etc.

Description of drawings

Fig. 1 is the structural principle schematic diagram for fermenting cellar surrounding air quality measurement device embodiment provided by the invention.

Among the figure: the airtight casing of 1-; The indoor sampled air inlet tube of 2-; The equal flow filter of 3-; 4-the first temperature sensor; The 5-heater block; The 6-Temperature Humidity Sensor; The 7-cooling-part; 8-the second temperature sensor; 9-air sampling driven fan; 10-sampled air efferent duct; 11-micro computer disposal system.

Embodiment

Below in conjunction with accompanying drawing structure of the present invention, principle and embodiment are described further.

Fig. 1 is the structural principle schematic diagram for fermenting cellar surrounding air quality measurement device embodiment provided by the invention.This device comprises airtight casing 1, indoor sampled air inlet tube 2, the first temperature sensor 4, heater block 5, Temperature Humidity Sensor 6, air sampling driven fan 9, sampled air efferent duct 10 and micro computer disposal system 11; Indoor sampled air inlet tube 2 and sampled air efferent duct 10 are separately positioned on the rear and front end on the airtight casing; The first temperature sensor 4, heater block 5, Temperature Humidity Sensor 6 and air sampling driven fan 9 are arranged in the airtight casing; And the first temperature sensor 4 is arranged between indoor sampled air inlet tube 2 and the heater block 5 and close room air entrance; Temperature Humidity Sensor 6 is arranged between heater block 5 and the air efferent duct 10; The first temperature sensor, heater block, Temperature Humidity Sensor and air sampling driven fan are connected by signal wire and are connected connection with the micro computer disposal system.

The disturbance that produces in order to eliminate the heating link, measuring accuracy further is provided, also can set gradually cooling-part 7 and the second temperature sensor 8 in airtight casing, cooling-part 7 and the second temperature sensor 8 are arranged between Temperature Humidity Sensor 6 and the air efferent duct 10.

In order to realize the even mixing of sampled air in airtight casing, also be provided with in the airtight casing and filter current equalizer 3, this current-sharing filter arrangement namely is arranged between indoor sampled air entrance and the first temperature sensor 4 in the back of indoor air sampling inlet tube 2.All behind the flow filter 3 the first temperature sensor 4 is set, detects the temperature of sampled air, this temperature is the air themperature in the fermenting cellar.

Above-mentioned fermenting cellar surrounding air quality measurement device, its temperature can detect by thermal resistance such as Pt100, humidity can detect by humicap, the signal that detects converts 0 to by transmitter ... 10VDC or 4 ... the 20mA signal is sent to micro computer disposal system 11(such as PLC controller or DDC controller or independently developed data collecting plate card etc.) on, realize calculating, storage and the demonstration of temperature, humidity.Heater block 5, cooling-part 7, air sampling driven fan 9 etc. also are connected to micro computer disposal system 11 by signal wire, realize heating efficiency, the adjusting of cooling power and the control of equipment start-stop.

Above-mentioned hot and humid environment humiture measurement mechanism, the micro computer Processing System Design has the RS485 communication interface of standard, the industrial field bus Modbus-RTU of support standard or Profibus-DP agreement can realize networking data collection and the Centralized Monitoring of many table apparatus.

Above-mentioned hot and humid environment temperature and humidity measurement method can be passed through micro computer disposal system 11 Programmings, does not start well heater when humidity is lower than setting value, i.e. temperature, humidity that the air themperature of heater block 5 rear measurements, humidity are room air.After being higher than setting value, humidity just starts heater block 5.

Above-mentioned hot and humid environment temperature and humidity measurement method carries pipeline and the container of air all to adopt insulation, with the accuracy that guarantees to measure.

Concrete steps and the principle of work of the measuring method for fermenting cellar surrounding air quality provided by the invention are as follows:

1) at first in fermenting cellar, is evenly arranged some air sampling tubes, sampled air is sent in the seal case 1, install in back, indoor air sampling porch and filter current equalizer 3, realize the even mixing of air.The temperature of the sampled air behind equal flow filter 3 is detected by the first temperature sensor 4, and this temperature is the temperature in the fermenting cellar.

2) behind the first temperature sensor 4 heater block 5 is set, sampled air is heated, air themperature raises after the heating, and relative humidity reduces, water capacity is constant, and temperature after heating and relative humidity are measured by Temperature Humidity Sensor 6.

The principle of work of measurement mechanism of the present invention is as follows:

1) arranges some air sampling tubes in the fermenting cellar, sampled air is sent in the seal case, utilize temperature sensor to detect the temperature t that obtains room air ₁

2) then the air that gathers is heated, utilize Temperature Humidity Sensor to detect the temperature t that obtains heating rear air ₂With relative humidity Φ ₂

3) above-mentioned 1), 2) in temperature sensor and Temperature Humidity Sensor by signal wire access micro computer disposal system, the micro computer disposal system calculates water capacity d according to following formula ₂

$P_{q\&CenterDot;b2}={2.718}^{(\frac{-5800.2206}{{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA00002351145700011.png"\; state="\{\{state\}\}">t</figure-callout>}}_2+273.15}+1.3914993-0.04860239\&times;({\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA00002351145700011.png"\; state="\{\{state\}\}">t</figure-callout>}}_2+273.15)+\frac{0.41764768\&times;{({\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA00002351145700011.png"\; state="\{\{state\}\}">t</figure-callout>}}_2+273.15)}^2}{10000}-\frac{0.14452093\&times;{({\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA00002351145700011.png"\; state="\{\{state\}\}">t</figure-callout>}}_2+273.15)}^3+6.5459673\&times;\ln ({\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA00002351145700011.png"\; state="\{\{state\}\}">t</figure-callout>}}_2+273.15)}{10000000})...\left(I\right)}$

P _q2=φ ₂×P _q·b2 …………………(Ⅱ)

${\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="HDA00002351145700011.png"\; state="\{\{state\}\}">d</figure-callout>}}_2=622\&times;\frac{P_{q2}}{P_a-{\mathrm{<figure-callout\; id="2"\; label="P\; q"\; filenames="HDA00002351145700011.png"\; state="\{\{state\}\}">P</figure-callout>}}_q}...\left(\mathrm{III}\right)$

In the above-mentioned formula:

P _Qb2T ₂Saturated vapor partial pressure (Pa) under the temperature;

t ₂Sampled air temperature after the heating (℃);

P _Q2T ₂Partial pressure of water vapor under the temperature (Pa);

P _aAtmospheric pressure (Pa);

d ₂Heating post-sampling air humidity content (g/kg (dry air));

4) water capacity according to sampled air before and after the heating equates, obtains heating the water capacity d of front sampled air ₁

5) relative humidity before the calculating sampling air heat, i.e. relative humidity Φ in the fermenting cellar ₁:

d ₁＝d ₂；…………………(Ⅳ)

$P_{q1}=\frac{d_1\&times;P_a}{d_1+622}...\left(V\right)$

$P_{q\&CenterDot;b1}={2.718}^{(\frac{-5800.2206}{t_1+273.15}+1.3914993-0.04860239\&times;(t_1+273.15)+\frac{0.41764768\&times;{(t_1+273.15)}^2}{10000}-\frac{0.14452093\&times;{(t_1+273.15)}^3+6.5459673\&times;\ln (t_1+273.15)}{10000000})...\left(\mathrm{VI}\right)}$

${\mathrm{\&phi;}}_1=\frac{P_{q1}}{P_{q\&CenterDot;b1}}...\left(\mathrm{VII}\right)$

In the above-mentioned formula:

P _Qb1T ₁Saturated vapor partial pressure (Pa) under the temperature;

T ₁Sampled air temperature before the heating (℃);

P _Q1T ₁Partial pressure of water vapor under the temperature (Pa);

P _aAtmospheric pressure (Pa);

d ₁Sampled air water capacity (g/kg (dry air)) before the heating;

Above-mentioned computation process is finished by microcomputer system.

Owing to being in hot and humid environment in the fermenting cellar, therefore need to heat sampled air, but it being very little to add heat, almost can ignore to the disturbance of indoor temperature and humidity.In order to eliminate the disturbance of this link, cooling-part 7 and the second temperature sensor 8 are set in airtight casing, cooling-part 7 and the second temperature sensor 8 are arranged between Temperature Humidity Sensor 6 and the air efferent duct 10.Namely install cooling-part 7 additional in Temperature Humidity Sensor 6 back, the air that sampling is come heats front temperature through cooling to after heating again, and is measured by the second temperature sensor 8 through the sampled air temperature behind the cooling-part 7.Sampled air after cooling-part 7 is cooled to air themperature in the fermenting cellar again, is sent back to air in the fermenting cellar by connecting line through air efferent duct 10, or directly is discharged in the atmosphere.

Claims (6)

1. one kind is used for fermenting cellar surrounding air quality measurement device, and it is characterized in that: this device comprises airtight casing (1), indoor sampled air inlet tube (2), the first temperature sensor (4), heater block (5), Temperature Humidity Sensor (6), air sampling driven fan (9), sampled air efferent duct (10) and micro computer disposal system (11); Indoor sampled air inlet tube (2) and sampled air efferent duct (10) are separately positioned on the airtight casing, and described the first temperature sensor (4), heater block (5), Temperature Humidity Sensor (6) and air sampling driven fan (9) are arranged in the airtight casing; The first temperature sensor (4) is arranged between indoor sampled air inlet tube (2) and the heater block (5) and close indoor sampled air entrance; Temperature Humidity Sensor (6) is arranged between heater block (5) and the sampled air efferent duct (10); The first temperature sensor, heater block, Temperature Humidity Sensor and air sampling driven fan be connected by signal wire be connected 11 with the micro computer disposal system) connect.

2. according to claim 1 a kind of for fermenting cellar surrounding air quality measurement device, it is characterized in that: also be disposed with cooling-part (7) and the second temperature sensor (8) in airtight casing (1), cooling-part (7) and the second temperature sensor (8) are arranged between Temperature Humidity Sensor (6) and the air efferent duct (10).

3. according to claim 1 and 2 a kind of for fermenting cellar surrounding air quality measurement device, it is characterized in that: in airtight casing (1), also be provided with equal flow filter (3), this current-sharing filter arrangement is in the front of the first temperature sensor, and close indoor sampled air porch.

4. according to claim 3 a kind of for fermenting cellar surrounding air quality measurement device, it is characterized in that: described sampled air efferent duct is connected with fermenting cellar by pipeline.

5. the measuring method that is used for fermenting cellar surrounding air quality that employing is installed as claimed in claim 1 is characterized in that the method comprises the steps:

1) arranges several air sampling tubes in the fermenting cellar, sampled air is sent in the seal case, utilize the temperature sensor that is arranged in the seal case that sampled air is detected, obtain adopting the temperature of air, i.e. air themperature t in the fermenting cellar ₁

2) by the heater block that is arranged in the temperature sensor back sampled air is heated, then utilize sampled air temperature t 2 and relative humidity Φ 2 after Temperature Humidity Sensor records heating; Make the relative humidity of the employing air after the heating be reduced to 60% to 70%;

3) utilize water capacity d after following formula calculates heating ₂:

$d_2=622\&times;\frac{P_{q2}}{P_a-P_{q2}}...\left(I\right)$

Wherein: P _Q2=φ ₂* P _Qb2(II)

$P_{q\&CenterDot;b2}={2.718}^{(\frac{-5800.2206}{t_2+273.15}+1.3914993-0.04860239\&times;(t_2+273.15)+\frac{0.41764768\&times;{(t_2+273.15)}^2}{10000}-\frac{0.14452093\&times;{(t_2+273.15)}^3+6.5459673\&times;\ln (t_2+273.15)}{10000000})...\left(\mathrm{III}\right)}$

In the above-mentioned formula:

P _Qb2T ₂Saturated vapor partial pressure under the temperature, unit are Pa;

t ₂Sampled air temperature after the heating, unit is ℃;

P _Q2Partial pressure of water vapor under the t2 temperature, unit are Pa;

P _aAtmospheric pressure, unit are Pa;

d ₂Heating post-sampling air humidity content, unit is g/kg;

4) water capacity according to sampled air before and after the heating equates d ₁=d ₂, obtain heating the water capacity d of front sampled air ₁

5) relative humidity before the calculating sampling air heat, i.e. relative humidity Φ in the fermenting cellar ₁:

${\mathrm{\&phi;}}_1=\frac{P_{q1}}{P_{q\&CenterDot;b1}}...\left(\mathrm{IV}\right)$

$P_{q1}=\frac{d_1\&times;P_a}{d_1+622}...\left(V\right)$

$P_{q\&CenterDot;b1}={2.718}^{(\frac{-5800.2206}{t_1+273.15}+1.3914993-0.04860239\&times;(t_1+273.15)+\frac{0.41764768\&times;{(t_1+273.15)}^2}{10000}-\frac{0.14452093\&times;{(t_1+273.15)}^3+6.5459673\&times;\ln (t_1+273.15)}{10000000})...\left(\mathrm{VI}\right)}$

In the above-mentioned formula:

P _Qb1T ₁Saturated vapor partial pressure under the temperature, unit are Pa;

t ₁Sampled air temperature before the heating, unit is ℃;

P _Q1T ₁Partial pressure of water vapor under the temperature, unit are Pa;

P _aAtmospheric pressure, unit are Pa;

d ₁Sampled air water capacity before the heating, unit is g/kg;

6. a kind of measuring method for fermenting cellar surrounding air quality according to claim 5, it is characterized in that: arrange successively cooling-part (7) and the second temperature sensor (8) in Temperature Humidity Sensor (6) back, by cooling-part the sampled air after heating is cooled off, utilized the second temperature sensor (8) to detect cooled temperature t ₃Compare the temperature that the first temperature sensor (4) and the second temperature sensor (8) detect, according to the difference of two temperature, regulate the cooling power of cooling-part (7), until the temperature t that the second temperature sensor (8) detects ₃Equal the temperature t that the first temperature sensor (4) detects ₁At this moment the sampled air state has namely returned to the air condition in the fermenting cellar; Then this sampled air is sent back in the fermenting cellar.

Images