CN113933464B - Method and system for measuring moisture removal rate of tobacco curing barn - Google Patents
Method and system for measuring moisture removal rate of tobacco curing barn Download PDFInfo
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- CN113933464B CN113933464B CN202111199692.3A CN202111199692A CN113933464B CN 113933464 B CN113933464 B CN 113933464B CN 202111199692 A CN202111199692 A CN 202111199692A CN 113933464 B CN113933464 B CN 113933464B
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- 241000208125 Nicotiana Species 0.000 title claims abstract description 39
- 235000002637 Nicotiana tabacum Nutrition 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 238000002360 preparation method Methods 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims description 18
- 238000007791 dehumidification Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004383 yellowing Methods 0.000 description 2
- 230000009418 agronomic effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229930002875 chlorophyll Natural products 0.000 description 1
- 235000019804 chlorophyll Nutrition 0.000 description 1
- ATNHDLDRLWWWCB-AENOIHSZSA-M chlorophyll a Chemical compound C1([C@@H](C(=O)OC)C(=O)C2=C3C)=C2N2C3=CC(C(CC)=C3C)=[N+]4C3=CC3=C(C=C)C(C)=C5N3[Mg-2]42[N+]2=C1[C@@H](CCC(=O)OC\C=C(/C)CCC[C@H](C)CCC[C@H](C)CCCC(C)C)[C@H](C)C2=C5 ATNHDLDRLWWWCB-AENOIHSZSA-M 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002255 enzymatic effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
Abstract
The invention belongs to the field of tobacco leaf modulation processing. Aiming at the problem that the prior art cannot accurately measure the moisture removal rate of tobacco baking in a tobacco baking room, the method and the system for measuring the moisture removal rate of the tobacco baking room are provided. The measuring method comprises the following steps: measuring the area S of a moisture discharge port; measuring the wind speed V of the dehumidifying port Wind power Dry bulb temperature T in the curing barn Inner dry And wet bulb temperature T Interior dampness The method comprises the steps of carrying out a first treatment on the surface of the Dry bulb temperature and wet bulb temperature T of external natural environment External drier And T External dampness The method comprises the steps of carrying out a first treatment on the surface of the Calculating the density rho of the hot and humid air discharged from the curing barn Inner part Moisture content d Inner part Density ρ of dry and cold air in natural environment Outer part Moisture content d Outer part The method comprises the steps of carrying out a first treatment on the surface of the Rate of moisture removal V by curing barn Water and its preparation method ＝V Inner water ‑V External water ＝V Interior humid air *d Inner part /(1000+d Inner part )—V Outside air *d Outer part /(1000+d Outer part ) And calculating to obtain the dehumidifying rate of the curing barn. The measuring system comprises an anemometer, a dry-wet bulb thermometer, a wet air parameter calculator, a PLC and a display. The accurate measurement of the moisture removal rate in the tobacco baking process can be realized.
Description
Technical Field
The invention belongs to the field of tobacco leaf modulation processing, and particularly relates to a method and a system for measuring the moisture removal rate of a tobacco leaf curing barn.
Background
The essential purpose of tobacco leaf baking is to show and exert the quality potential of tobacco leaves formed and accumulated in the agronomic process to the maximum extent, so as to achieve the effects of tobacco leaf yellowing, baking, soft baking and fragrant baking. The tobacco leaves are gradually changed from fresh tobacco with the water content of 80-90% to dry tobacco with the water content of 8-9% after the baking starts to finish for about one week, and a large amount of water is required to be dissipated. The speed of water loss is closely related to the quality of the cured tobacco, so that the curing of the high-quality tobacco is realized, and the coordination of the change of the internal components of the tobacco and the water loss must be realized. Too fast water loss can easily lead to insufficient chlorophyll degradation to cause baking green, and too slow water loss can easily lead to excessive respiration consumption of tobacco leaves, and enzymatic browning reaction can easily occur to cause baking grains. The "no water and no yellowing, no water and no smoke damage" has been summarized in the category of water regulation in tobacco leaf baking.
In the tobacco leaf baking process, the regulation and control of the tobacco leaf moisture are generally carried out through the setting of the wet bulb temperature, when the wet bulb temperature in a baking room is higher than a certain value of a set value, a cold air door is opened, external dry and cold air enters a tobacco accommodating chamber through preheating under the action of a circulating fan, and the wet and hot air in the tobacco accommodating chamber is discharged outdoors under the action of pressure, so that the regulation and control of the tobacco leaf moisture are realized, and the process is called as 'dehumidification' of tobacco leaf baking. Under normal conditions, the moisture removal rate directly determines the moisture loss speed of the tobacco leaves, and is also one of the determining factors of the quality of the tobacco leaves after baking. At present, the judgment of the dehumidification rate is generally qualitative judgment according to the opening angle of a cold air door and the rotation speed of a fan, and the requirements of high-quality development of tobacco baking cannot be met.
Disclosure of Invention
Aiming at the problem that the prior art cannot accurately measure the moisture removal rate of the tobacco curing barn, the invention provides the method and the system for measuring the moisture removal rate of the tobacco curing barn, which can accurately measure the moisture removal rate of the tobacco curing process and are beneficial to accurately regulating and controlling the moisture of the tobacco in the curing process.
The invention is realized by the following technical scheme:
the method for measuring the moisture removal rate of the tobacco curing barn comprises the following steps:
(1) Measuring the length and the width of a dehumidifying port of the curing barn, and calculating the area S=length;
(2) Measuring the wind speed V of the dehumidifying port Wind power ；
(3) Dry bulb temperature T in the curing barn during measurement and recording Inner dry And wet bulb temperature T Interior dampness ；
(4) Measuring and recording the dry bulb temperature and the wet bulb temperature T of the external natural environment during measurement External drier And T External dampness ；
(5) The temperature T of the dry ball in the curing barn Inner dry And wet bulb temperature T Interior dampness Dry bulb temperature T of the external natural environment External drier And wet bulb temperature T External dampness Inputting the humidity air parameter calculator to calculate the density rho of the humidity and hot air discharged from the curing barn Inner part Moisture content d Inner part Density ρ of dry and cold air in natural environment Outer part Moisture content d Outer part ；
(6) Moisture-removing mouth bakingIn-house humid and hot air discharge rate V Interior humid air ＝ρ Inner part *S*V Wind power *3600；
The dry and cold air inflow volume in unit time is equal to the dry and cold air inflow volume in unit time, and the external dry and cold air inflow curing barn speed V Outside air ＝ρ Outer part *S*V Wind power *3600；
Calculating the water discharge rate V of the hot and humid air at the wet discharge port Inner water ＝V Interior humid air *d Inner part /(1000+d Inner part )；
Calculating the water inflow rate V of the outside dry and cold air External water ＝V Outside air *d Outer part /(1000+d Outer part )；
Dehumidifying rate V of curing barn Water and its preparation method ＝V Inner water -V External water ＝V Interior humid air *d Inner part /(1000+d Inner part )—V Outside air *d Outer part /(1000+d Outer part )；
Substituting each parameter into a curing barn dehumidification rate formula, and finally obtaining the curing barn dehumidification rate:
V water and its preparation method ＝ρ Inner part *S*V Wind power *3600*d Inner part /(1000+d Inner part )—ρ Outer part *S*V Wind power *3600*d Outer part /(1000+d Outer part )。
The area S of the moisture discharging opening is m 2 Density ρ of hot and humid air exhausted from the curing barn Inner part Density ρ of dry and cold air in natural environment Outer part In kg/m 3 Wind speed V Wind power The unit is m/s, and the moisture content d of the hot and humid air discharged from the curing barn Inner part Moisture content d of dry and cold air in external natural environment Outer part The unit is g/kg dry air.
Further, the step (2) is to measure the wind speed V of the moisture discharging port through an anemometer Wind power 。
Further, the step (3) is to measure and record the dry bulb temperature T in the curing barn by a dry bulb thermometer Inner dry And wet bulb temperature T Interior dampness Placing dry and wet bulb thermometers at different positions in the curing barn, and taking the average value of measured values at different positions as a dry bulbTemperature T Inner dry And wet bulb temperature T Interior dampness 。
Further, the step (4) uses a dry-wet bulb thermometer to measure and record the dry bulb temperature and the wet bulb temperature T of the external natural environment during measurement External drier And T External dampness A dry-wet bulb thermometer is arranged at different positions around the outer moisture discharging opening of the curing barn, and the average value of measured values at different positions is taken as the dry bulb temperature and the wet bulb temperature T of the external natural environment External drier And T External dampness 。
The invention also provides a system for measuring the moisture removal rate of the tobacco curing barn, which comprises an anemometer, a dry and wet bulb thermometer, a wet air parameter calculator, a PLC and a display, wherein the anemometer, the dry and wet bulb thermometer, the wet air parameter calculator and the display are respectively connected with the PLC, the anemometer is arranged at a moisture removal port of the curing barn, and the measured wind speed V of the moisture removal port is measured by the anemometer Wind power Uploading to a PLC, wherein the dry and wet ball temperatures are several, and are respectively arranged in and outside the curing barn, and the measured dry ball temperature T in the curing barn Inner dry And wet bulb temperature T Interior dampness Dry bulb temperature T of the external natural environment External drier And wet bulb temperature T External dampness Uploading to a PLC, and starting a wet air parameter calculator by the PLC, wherein the wet air parameter calculator calculates the density rho of the wet and hot air discharged from the curing barn Inner part Moisture content d Inner part Density ρ of dry and cold air in natural environment Outer part Moisture content d Outer part The PLC embeds a curing barn dehumidification rate calculation program: dehumidifying rate V of curing barn Water and its preparation method ＝V Inner water -V External water ＝V Interior humid air *d Inner part /(1000+d Inner part )—V Outside air *d Outer part /(1000+d Outer part ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the discharge rate V of the damp and hot air in the damp-discharging port curing barn Interior humid air ＝ρ Inner part *S*V Wind power *3600; the external dry and cold air flows into the curing barn at a rate V Outside air ＝ρ Outer part *S*V Wind power *3600; moisture discharge rate V in hot and humid air at a moisture discharge port Inner water ＝V Interior humid air *d Inner part /(1000+d Inner part ) The method comprises the steps of carrying out a first treatment on the surface of the Moisture inflow rate V in external dry and cold air External water ＝V Outside air *d Outer part /(1000+d Outer part ) S is the area of a moisture discharging port; the display is used for displaying the dehumidification rate of the curing barn calculated by the PLC.
Further, the wet air parameter calculator is a wet air parameter calculation software built in the PLC.
The beneficial effects of the invention are as follows: the invention realizes the accurate measurement of the dehumidification rate of the curing barn, and the measuring system has simple structure and high degree of automation; the invention is beneficial to realizing the accurate regulation and control of the moisture of tobacco leaves in the baking process.
Drawings
FIG. 1 is a schematic diagram of the system for determining the moisture removal rate of a tobacco leaf bulk curing barn.
Detailed Description
The invention will be described in further detail with reference to specific embodiments and drawings.
Example 1
In the baking process of the baking room, the temperature T of the dry ball is measured Inner dry Wet bulb temperature t=42℃ Interior dampness The rate of moisture removal of the curing barn in the moisture-removed state was calculated =38deg.C.
Measuring the length of a single moisture discharging opening of the curing barn to be 40cm and the width of the single moisture discharging opening to be 40cm, and calculating the area of the single moisture discharging opening to be 0.16m 2 The two dehumidifying ports with the same size are shared in the curing barn, so that the total area S=0.32m of the dehumidifying ports 2 。
Measuring the wind speed V of the moisture discharging port by an anemometer Wind power ＝1.24m/s。
Dry ball temperature T for measuring outside dry and cold air of curing barn External drier Wet bulb temperature t=26℃ External dampness ＝22℃
Inputting dry bulb temperature T on wet air parameter calculator Inner dry =42 ℃ and wet bulb temperature T Interior dampness =38deg.C, calculating the density ρ of hot and humid air discharged from the curing barn Inner part ＝1.10kg/m 3 Moisture content d Inner part = 41.61g/kg dry air.
Inputting dry bulb temperature T on wet air parameter calculator External drier =26 ℃ and wet bulb temperature T External dampness The density ρ of the outside dry and cold air is calculated at 22 DEG C Outer part ＝1.17kg/m 3 Moisture content d Outer part =14.90 g/kg dry air.
The above parameters are taken into the following calculation formula:
dehumidifying rate V of curing barn Water and its preparation method ＝ρ Inner part *S*V Wind power *3600*d Inner part /(1000+d Inner part )-ρ Outer part *S*V Wind power *3600*d Outer part /(1000+d Outer part )
＝1.10*0.32*1.24*3600*41.61/(1000+41.61)-1.17*0.32*1.24*3600*14.90/(1000+14.90)＝62.77-24.54＝38.23kg/h。
Namely: the temperature of the dry bulb of the outside air is 26 ℃, the temperature of the wet bulb is 22 ℃, the temperature of the dry bulb in the curing barn is 42 ℃, the temperature of the wet bulb is 38 ℃, and the water in the curing barn is discharged at a rate of 38.23kg/h when the curing barn is in a moisture-discharging state.
Example 2
The system for measuring the moisture removal rate of the tobacco leaf bulk curing barn comprises an anemometer, a temperature and humidity measuring and controlling instrument, a wet air parameter calculator, a PLC and a display, wherein the anemometer, the intelligent dry and wet ball temperature measuring and controlling instrument, the wet air parameter calculator and the display are respectively connected with the PLC as shown in figure 1.
The anemometer is arranged at the moisture discharging port of the curing barn, and the measured air speed V of the moisture discharging port is measured Wind power Uploading to the PLC. The intelligent dry and wet bulb temperature measuring and controlling instrument is provided with a plurality of dry bulb temperature measuring and controlling instruments which are respectively arranged in the curing barn and outside the curing barn and used for measuring the dry bulb temperature T in the curing barn Inner dry And wet bulb temperature T Interior dampness Dry bulb temperature T of the external natural environment External drier And wet bulb temperature T External dampness Uploading to a PLC, and starting a wet air parameter calculator by the PLC, wherein the wet air parameter calculator calculates the density rho of the wet and hot air discharged from the curing barn Inner part Moisture content d Inner part Density ρ of dry and cold air in natural environment Outer part Moisture content d Outer part 。
The dehumidification rate calculation program of the PLC built-in curing barn comprises the following steps: dehumidifying rate V of curing barn Water and its preparation method ＝V Inner water -V External water ＝V Interior humid air *d Inner part /(1000+d Inner part )—V Outside air *d Outer part /(1000+d Outer part ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the moisture discharging portDischarge rate V of damp and hot air in curing barn Interior humid air ＝ρ Inner part *S*V Wind power *3600; the external dry and cold air flows into the curing barn at a rate V Outside air ＝ρ Outer part *S*V Wind power *3600; moisture discharge rate V in hot and humid air at a moisture discharge port Inner water ＝V Interior humid air *d Inner part /(1000+d Inner part ) The method comprises the steps of carrying out a first treatment on the surface of the Moisture inflow rate V in external dry and cold air External water ＝V Outside air *d Outer part /(1000+d Outer part ). The relevant parameters such as the area S of the dehumidifying port can be set and modified through the input device of the PLC. The display is used for displaying the dehumidification rate of the curing barn calculated by the PLC.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (6)
1. The method for measuring the moisture removal rate of the tobacco curing barn is characterized by comprising the following steps of:
(1) Measuring the length and the width of a dehumidifying port of the curing barn, and calculating the area S=length;
(2) Measuring the wind speed V of the dehumidifying port Wind power ；
(3) Dry bulb temperature T in the curing barn during measurement and recording Inner dry And wet bulb temperature T Interior dampness ；
(4) Measuring and recording the dry bulb temperature and the wet bulb temperature T of the external natural environment during measurement External drier And T External dampness ；
(5) The temperature T of the dry ball in the curing barn Inner dry And wet bulb temperature T Interior dampness Dry bulb temperature T of the external natural environment External drier And wet bulb temperature T External dampness Inputting the humidity air parameter calculator to calculate the density rho of the humidity and hot air discharged from the curing barn Inner part Moisture content d Inner part Density ρ of dry and cold air in natural environment Outer part Moisture content d Outer part ；
(6) Calculating the discharge rate V of the damp and hot air in the damp-discharging port curing barn Interior humid air ＝ρ Inner part *S*V Wind power *3600；
The dry and cold air inflow volume in unit time is equal to the dry and cold air inflow volume in unit time, and the external dry and cold air inflow curing barn speed V Outside air ＝ρ Outer part *S*V Wind power *3600；
Calculating the water discharge rate V of the hot and humid air at the wet discharge port Inner water ＝V Interior humid air *d Inner part /(1000+d Inner part )；
Calculating the water inflow rate V of the outside dry and cold air External water ＝V Outside air *d Outer part /(1000+d Outer part )；
Dehumidifying rate V of curing barn Water and its preparation method ＝V Inner water -V External water ＝V Interior humid air *d Inner part /(1000+d Inner part )—V Outside air *d Outer part /(1000+d Outer part )；
Substituting each parameter into a curing barn dehumidification rate formula, and finally obtaining the curing barn dehumidification rate:
V water and its preparation method ＝ρ Inner part *S*V Wind power *3600*d Inner part /(1000+d Inner part )—ρ Outer part *S*V Wind power *3600*d Outer part /(1000+d Outer part )；
The area S of the moisture discharging opening is m 2 Density ρ of hot and humid air exhausted from the curing barn Inner part Density ρ of dry and cold air in natural environment Outer part In kg/m 3 Wind speed V Wind power The unit is m/s, and the moisture content d of the hot and humid air discharged from the curing barn Inner part Moisture content d of dry and cold air in external natural environment Outer part The unit is g/kg dry air.
2. The method according to claim 1, wherein the step (2) is to measure the wind speed V of the wet discharging port by an anemometer Wind power 。
3. The method according to claim 1, wherein,the step (3) is to measure and record the dry bulb temperature T in the curing barn by a dry bulb thermometer Inner dry And wet bulb temperature T Interior dampness Placing dry and wet bulb thermometers at different positions in the curing barn, taking the average value of measured values at different positions as the dry bulb temperature T Inner dry And wet bulb temperature T Interior dampness 。
4. The method according to claim 1, wherein the step (4) is to measure and record the dry bulb temperature and the wet bulb temperature T of the external natural environment at the time of measurement with a dry bulb thermometer External drier And T External dampness A dry-wet bulb thermometer is arranged at different positions around the outer moisture discharging opening of the curing barn, and the average value of measured values at different positions is taken as the dry bulb temperature and the wet bulb temperature T of the external natural environment External drier And T External dampness 。
5. The system is characterized by comprising an anemometer, a dry and wet bulb thermometer, a wet air parameter calculator, a PLC and a display, wherein the anemometer, the dry and wet bulb thermometer, the wet air parameter calculator and the display are respectively connected with the PLC, and the anemometer is arranged at a moisture outlet of the curing barn and is used for measuring the wind speed V of the moisture outlet Wind power Uploading to a PLC, wherein the dry and wet ball temperatures are several, and are respectively arranged in and outside the curing barn, and the measured dry ball temperature T in the curing barn Inner dry And wet bulb temperature T Interior dampness Dry bulb temperature T of the external natural environment External drier And wet bulb temperature T External dampness Uploading to a PLC, and starting a wet air parameter calculator by the PLC, wherein the wet air parameter calculator calculates the density rho of the wet and hot air discharged from the curing barn Inner part Moisture content d Inner part Density ρ of dry and cold air in natural environment Outer part Moisture content d Outer part The PLC embeds a curing barn dehumidification rate calculation program: dehumidifying rate V of curing barn Water and its preparation method ＝V Inner water -V External water ＝V Interior humid air *d Inner part /(1000+d Inner part )—V Outside air *d Outer part /(1000+d Outer part ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the interior of the baking room with the moisture-removing mouth is moist, hot and emptyGas discharge rate V Interior humid air ＝ρ Inner part *S*V Wind power *3600; the external dry and cold air flows into the curing barn at a rate V Outside air ＝ρ Outer part *S*V Wind power *3600; moisture discharge rate V in hot and humid air at a moisture discharge port Inner water ＝V Interior humid air *d Inner part /(1000+d Inner part ) The method comprises the steps of carrying out a first treatment on the surface of the Moisture inflow rate V in external dry and cold air External water ＝V Outside air *d Outer part /(1000+d Outer part ) S is the area of a moisture discharging port; the display is used for displaying the dehumidification rate of the curing barn calculated by the PLC.
6. The measurement system according to claim 5, wherein the humid air parameter calculator is a humid air parameter calculation software built into a PLC.
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|---|---|---|---|---|
| US4192323A (en) * | 1977-09-21 | 1980-03-11 | Gas-Fired Products, Inc. | Apparatus and method for automatically controlling curing conditions in a tobacco curing barn |
| CN202853919U (en) * | 2012-11-12 | 2013-04-03 | 天津市卓东科技发展有限公司 | Enthalpy difference laboratory |
| CN112075656A (en) * | 2020-10-22 | 2020-12-15 | 中国农业科学院烟草研究所 | Intelligent control method for auxiliary dehumidification of closed circulation heat pump tobacco curing barn |
| CN112155243A (en) * | 2020-10-22 | 2021-01-01 | 云南省烟草农业科学研究院 | Baking method capable of improving tobacco leaf smoking quality based on heat pump baking dehumidification system |
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2021
- 2021-10-14 CN CN202111199692.3A patent/CN113933464B/en active Active
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|---|---|---|---|---|
| US4192323A (en) * | 1977-09-21 | 1980-03-11 | Gas-Fired Products, Inc. | Apparatus and method for automatically controlling curing conditions in a tobacco curing barn |
| CN202853919U (en) * | 2012-11-12 | 2013-04-03 | 天津市卓东科技发展有限公司 | Enthalpy difference laboratory |
| CN112075656A (en) * | 2020-10-22 | 2020-12-15 | 中国农业科学院烟草研究所 | Intelligent control method for auxiliary dehumidification of closed circulation heat pump tobacco curing barn |
| CN112155243A (en) * | 2020-10-22 | 2021-01-01 | 云南省烟草农业科学研究院 | Baking method capable of improving tobacco leaf smoking quality based on heat pump baking dehumidification system |
Non-Patent Citations (1)
| Title |
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| 密集烤房烘烤技术参数的测定与分析;孟智勇;张保占;马浩波;张东峰;;河南农业科学(第04期);全文 * |
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