CN102944647B - 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 for fermenting cellar ambient air quality and method

Technical field

The present invention relates to air quality is measured under a kind of hot and humid environment method and device, particularly relate to method and device that fermenting cellar environment air quality measures, belong to the field that indoor air quality detects and controls.

Background technology

All there is the processing link of fermentation in the food processing process such as beer, white wine, bread, tobacco, fermentation indoor temperature reaches as high as 60 DEG C, and humidity can to more than 95%, and the detection of the temperature in fermenting cellar, humidity etc. is to zymotechnique important in inhibiting.In existing technology, indoor air quality is mainly through being installed on indoor various sensors, transmitter to realize indoor temperature, the isoparametric detection of humidity.And the surveying instrument of these routines is all difficult to adapt to the long-time high temperature of appearance, the environment of high humidity in sweat.On the one hand, in hot and humid environment, when temperature changes slightly, wall or indoor object just easily condense, be installed on indoor Temperature Humidity Sensor and belong to electronic product, there is circuit board transmitter inside, is just easy to damage once condensation.On the other hand, temperature measurement probe can directly contact with room air, temperature survey can be realized by the conduction of heat, but humidity-measuring probe directly must contact with air, in high humidity environment, the sensor probe humidity-sensitive element (hygristor or humicap) measuring humidity easily produces larger drift.For these reasons, in current hot and humid environment, temperature, humidity etc. are measured and substantially all cannot be stablized, realizes reliably, or 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 for the measurement of fermenting cellar ambient air quality and device, can for a long time, air quality in stable, reliable measurements hot and humid environment, cannot the deficiency of long-term stable operation hot and humid environment in such as fermenting cellar to make up conventional Temperature Humidity Sensor.

Technical scheme of the present invention is as follows:

A kind of for fermenting cellar ambient air quality measurement mechanism, it is characterized in that: this device comprises containment housing, 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 in containment housing, and described first temperature sensor, heater block, Temperature Humidity Sensor and air sampling driven fan are arranged in containment housing; Between first temperature sensor sampled air disposed in the interior inlet tube and heater block and near indoor sampled air entrance; Temperature Humidity Sensor is arranged between heater block and sampled air efferent duct; First temperature sensor, heater block, Temperature Humidity Sensor are connected with micro computer disposal system respectively by signal wire with air sampling driven fan.

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

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

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

1) arrange several air sampling tubes in fermenting cellar, sampled air is sent in a seal case, utilize the temperature sensor be arranged in seal case to detect sampled air, obtain the temperature adopting air, the air themperature t namely in fermenting cellar ₁;

2) by the heater block be arranged in after temperature sensor, sampled air is heated, then utilize Temperature Humidity Sensor to record the sampled air temperature t2 after heating and relative humidity Φ 2; The relative humidity of the sampled air after heating is made to be reduced to 60% to 70%;

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

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

Wherein: P _q2=φ ₂× P _qb2(II)

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

In above-mentioned formula:

P _qb2t ₂saturated vapor partial pressure at temperature, unit is Pa;

T ₂sampled air temperature after heating, unit is DEG C;

P _q2t ₂partial pressure of water vapor at temperature, unit is Pa;

P _aatmospheric pressure, unit is Pa;

D ₂heating post-sampling air humidity content, unit is g/kg;

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

5) following formula is utilized and by the relative humidity before micro computer disposal system calculating sampling air heat, the relative humidity Φ namely in fermenting cellar ₁:

${\mathrm{\φ}}_1=\frac{P_{q1}}{P_{q\·b1}}...\left(\mathrm{IV}\right)$

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

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

In above-mentioned formula:

P _qb1t ₁saturated vapor partial pressure at temperature, unit is Pa;

T ₁sampled air temperature DEG C before heating;

P _q1t ₁partial pressure of water vapor at temperature, unit is Pa;

P _aatmospheric pressure, unit is Pa;

D ₁sampled air water capacity before heating, unit is g/kg;

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

The present invention compared with prior art, have the following advantages and high-lighting effect: 1. the present invention is provided with temperature sensor successively due to the air in fermenting cellar is introduced one, heater block, in the containment housing of Temperature Humidity Sensor and power sampling blower fan, sampled air is constant by water capacity after heating, and relative humidity reduces, therefore moisture measurement does not need to detect under high humidity environment, the humidity-sensitive element (hygristor or humicap) avoiding the sensor measuring humidity in high humidity environment easily drifts about, condensation is damaged and measuring accuracy reduces the problem such as comparatively.2. Temperature Humidity Sensor is different in different temperature humidity range interval measure precision, the present invention adds heat by control heater block, the temperature after heater block and relative humidity can be controlled, the temperature and humidity measurement after heating is remained in the highest interval of sensor accuracy and carries out.3. sampled air can be cooled to fermenting cellar indoor temperature again by the cooling power of controlled cooling model parts, even if sampled air returns to the state before sampling processing again, and send back in room by thermo-insulating pipe line, avoid and extract sampled air to the interference of indoor temperature, humidity, pressure etc.

Accompanying drawing explanation

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

In figure: 1-containment housing; The indoor sampled air inlet tube of 2-; The equal flow filter of 3-; 4-first temperature sensor; 5-heater block; 6-Temperature Humidity Sensor; 7-cooling-part; 8-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 ambient air quality measurement mechanism embodiment provided by the invention.This device comprises containment housing 1, indoor sampled air inlet tube 2, 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 in containment housing; First temperature sensor 4, heater block 5, Temperature Humidity Sensor 6 and air sampling driven fan 9 are arranged in containment housing; And between the first temperature sensor 4 sampled air inlet tube 2 disposed in the interior and heater block 5 and near indoor air inlet; Temperature Humidity Sensor 6 is arranged between heater block 5 and air outlet conduits 10; First temperature sensor, heater block, Temperature Humidity Sensor are connected with micro computer disposal system 11 respectively by signal wire with air sampling driven fan.

In order to eliminate the disturbance that heating link produces, there is provided measuring accuracy further, also can set gradually cooling-part 7 and the second temperature sensor 8 in containment housing, cooling-part 7 and the second temperature sensor 8 to be arranged between Temperature Humidity Sensor 6 and air outlet conduits 10.

In order to realize the Homogeneous phase mixing of sampled air in containment housing, be also provided with in containment housing and filter current equalizer 3, this current-sharing filter arrangement, in the back of indoor air sampling inlet tube 2, is namely arranged between indoor sampled air entrance and the first temperature sensor 4.Arrange the first temperature sensor 4 after equal flow filter 3, detect the temperature of sampled air, this temperature is the air themperature in fermenting cellar.

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

Above-mentioned hot and humid environment humiture measurement mechanism, 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 multiple stage device.

Above-mentioned hot and humid environment temperature and humidity measurement method, by micro computer disposal system 11 Programming, does not start well heater in humidity lower than during setting value, and the air themperature namely measured after heater block 5, humidity are temperature, the humidity of room air.Just heater block 5 is started after humidity is higher than setting value.

Above-mentioned hot and humid environment temperature and humidity measurement method, pipeline and the container of conveying air all adopt insulation, to ensure the accuracy measured.

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

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

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

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

1) arrange some air sampling tubes in fermenting cellar, sampled air is sent in a seal case, utilize temperature sensor to detect the temperature t obtaining room air ₁;

2) then the air of collection is heated, utilize Temperature Humidity Sensor to detect the temperature t obtaining 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, micro computer disposal system goes out water capacity d according to following formulae discovery ₂;

$P_{q\·b2}={2.718}^{(\frac{-5800.2206}{t_2+273.15}+1.3914993-0.04860239\×(t_2+273.15)+\frac{0.41764768\×{(t_2+273.15)}^2}{10000}-\frac{0.14452093\×{(t_2+273.15)}^3+6.5459673\×\ln (t_2+273.15)}{10000000})...\left(I\right)}$

P _q2=φ ₂×P _q·b2…………………(Ⅱ)

$d_2=622\×\frac{P_{q2}}{P_a-P_{q2}}...\left(\mathrm{III}\right)$

In above-mentioned formula:

P _qb2t ₂saturated vapor partial pressure (Pa) at temperature;

T ₂sampled air temperature (DEG C) after heating;

P _q2t ₂partial pressure of water vapor (Pa) at temperature;

P _aatmospheric pressure (Pa);

D ₂heating post-sampling air humidity content (g/kg (dry air));

4) equal according to the water capacity of sampled air before and after heating, obtain the water capacity d heating front sampled air ₁;

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

d ₁＝d ₂；…………………(Ⅳ)

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

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

${\mathrm{\φ}}_1=\frac{P_{q1}}{P_{q\·b1}}...\left(\mathrm{VII}\right)$

In above-mentioned formula:

P _qb1t ₁saturated vapor partial pressure (Pa) at temperature;

T ₁sampled air temperature (DEG C) before heating;

P _q1t ₁partial pressure of water vapor (Pa) at temperature;

P _aatmospheric pressure (Pa);

D ₁sampled air water capacity (g/kg (dry air)) before heating;

Above-mentioned computation process is completed by microcomputer system.

Owing to being in hot and humid environment in fermenting cellar, therefore need to heat to sampled air, but it is very little to add heat, almost negligible to the disturbance of indoor temperature and humidity.In order to eliminate the disturbance of this link, arrange cooling-part 7 and the second temperature sensor 8 in containment housing, cooling-part 7 and the second temperature sensor 8 to be arranged between Temperature Humidity Sensor 6 and air outlet conduits 10.Namely install cooling-part 7 additional in Temperature Humidity Sensor 6 back, the air of coming sampling cools to the temperature before heating again after heating, and the sampled air temperature after cooling-part 7 is measured by the second temperature sensor 8 and obtained.Sampled air is cooled to again the air themperature in fermenting cellar through cooling-part 7 after, then through air outlet conduits 10, air is sent back in fermenting cellar by connecting line, or be directly discharged in air.

Claims (6)

1. for a fermenting cellar ambient air quality measurement mechanism, it is characterized in that: this device comprises containment housing (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 in containment housing, and described first temperature sensor (4), heater block (5), Temperature Humidity Sensor (6) and air sampling driven fan (9) are arranged in containment housing; Between first temperature sensor (4) sampled air disposed in the interior inlet tube (2) and heater block (5) and near indoor sampled air entrance; Temperature Humidity Sensor (6) is arranged between heater block (5) and sampled air efferent duct (10); First temperature sensor, heater block, Temperature Humidity Sensor are connected with micro computer disposal system (11) respectively by signal wire with air sampling driven fan.

2. one according to claim 1 is used for fermenting cellar ambient air quality measurement mechanism, it is characterized in that: in containment housing (1), be also disposed with cooling-part (7) and the second temperature sensor (8), cooling-part (7) and the second temperature sensor (8) are arranged between Temperature Humidity Sensor (6) and air outlet conduits (10).

3. one according to claim 1 and 2 is used for fermenting cellar ambient air quality measurement mechanism, it is characterized in that: in containment housing (1), be also provided with equal flow filter (3), this current-sharing filter arrangement is before the first temperature sensor, and close indoor sampled air porch.

4. one according to claim 3 is used for fermenting cellar ambient air quality measurement mechanism, it is characterized in that: described sampled air efferent duct is connected with fermenting cellar by pipeline.

5. adopt the measuring method for fermenting cellar ambient air quality of device as claimed in claim 1, it is characterized in that the method comprises the steps:

1) arrange several air sampling tubes in fermenting cellar, sampled air is sent in a seal case, utilize the temperature sensor be arranged in seal case to detect sampled air, obtain the temperature adopting air, the air themperature t namely in fermenting cellar ₁;

2) by the heater block be arranged in after temperature sensor, sampled air is heated, then utilize Temperature Humidity Sensor to record the sampled air temperature t2 after heating and relative humidity Φ 2; The relative humidity of the employing air after heating is made to be reduced to 60% to 70%;

3) the water capacity d after utilizing following formulae discovery to go out heating ₂:

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

Wherein: P _q2=φ ₂× P _qb2(II)

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

In above-mentioned formula:

P _qb2t ₂saturated vapor partial pressure at temperature, unit is Pa;

T ₂sampled air temperature after heating, unit is DEG C;

P _q2partial pressure of water vapor at t2 temperature, unit is Pa;

P _aatmospheric pressure, unit is Pa;

D ₂heating post-sampling air humidity content, unit is g/kg;

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

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

${\mathrm{\φ}}_1=\frac{P_{q1}}{P_{q\·b1}}...\left(\mathrm{IV}\right)$

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

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

In above-mentioned formula:

P _qb1t ₁saturated vapor partial pressure at temperature, unit is Pa;

T ₁sampled air temperature before heating, unit is DEG C;

P _q1t ₁partial pressure of water vapor at temperature, unit is Pa;

P _aatmospheric pressure, unit is Pa;

D ₁sampled air water capacity before heating, unit is g/kg.

6. a kind of measuring method for fermenting cellar ambient air quality according to claim 5, it is characterized in that: arrange cooling-part (7) and the second temperature sensor (8) successively below at Temperature Humidity Sensor (6), by cooling-part, the sampled air after heating is cooled, utilize the second temperature sensor (8) to detect cooled temperature t ₃; The temperature that comparison 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 ₁; At this moment namely sampled air state has returned to the air condition in fermenting cellar; Then this sampled air is sent back in fermenting cellar.