CN113933464A - 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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- 241000208125 Nicotiana Species 0.000 title claims abstract description 41
- 235000002637 Nicotiana tabacum Nutrition 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000007599 discharging Methods 0.000 claims abstract description 26
- 238000007791 dehumidification Methods 0.000 claims abstract description 5
- 238000005259 measurement Methods 0.000 claims description 10
- 238000003556 assay Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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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 can not accurately measure the moisture removal rate of tobacco leaf curing in a tobacco leaf curing barn, the invention provides a method and a system for measuring the moisture removal rate of the tobacco leaf curing barn. The determination method comprises the following steps: measuring the area S of a moisture discharging port; measuring the wind speed V of the moisture exhaust portWind powerDry bulb temperature T in the curing barnInner trunkAnd wet bulb temperature TInternal dampness(ii) a Dry bulb temperature and wet bulb temperature T of the external natural environmentExternal stemAnd TExternal dampness(ii) a Calculating the density rho of the damp and hot air discharged from the curing barnInner partMoisture content dInner partDensity rho of dry and cold air in natural environmentOuter coverMoisture content dOuter cover(ii) a Rate of dehumidification V through barnWater (W)＝VInner water‑VExternal water＝VInternal humid air*dInner part/(1000+dInner part)—VOutside air*dOuter cover/(1000+dOuter cover) And calculating to obtain the moisture removal rate of the curing barn. The measuring system comprises an anemometer, a wet-dry bulb thermometer, a wet air parameter calculator and a PLC and display. The moisture removal rate in the tobacco leaf baking process can be accurately measured.
Description
Technical Field
The invention belongs to the field of tobacco leaf modulation processing, and particularly designs a method and a system for measuring the moisture removal rate of a tobacco leaf curing barn.
Background
The tobacco leaf baking aims at exposing and playing the quality potential of the formed and accumulated tobacco leaves in the agricultural process to the maximum extent, so as to achieve the purposes of yellowing, baking, softening and roasting the tobacco leaves. Generally, the time lasts for about one week from the beginning to the end of the baking, the tobacco leaves gradually change from fresh tobacco with the water content of 80-90% to dry tobacco with the water content of 8-9%, and a large amount of water needs to be dissipated. The speed of water loss is closely related to the quality of the baked tobacco leaves, so that the high-quality tobacco leaves are baked, and the coordination of the internal component change and water loss of the tobacco leaves is required. Too fast water loss easily leads to insufficient degradation of chlorophyll to cause green baking, while too slow water loss easily leads to over-breathing consumption of tobacco leaves and enzymatic browning reaction to cause baking of the tobacco grains. The Hangul of 'no water and no yellow, no water and no bad tobacco' roughly explains that the water regulation is in the core position in the tobacco leaf baking.
In the tobacco leaf baking process, the regulation and control of the moisture of the tobacco leaves are generally carried out through the setting of the wet bulb temperature, when the wet bulb temperature in the baking room is higher than a set value by a certain numerical value, the cold air door is opened, the external dry and cold air enters the tobacco loading chamber through preheating under the action of the circulating fan, and the damp and hot air in the tobacco loading chamber is discharged outdoors under the action of pressure, so that the regulation and control of the moisture of the tobacco leaves are realized, and the process is called as the 'humidity discharge' of the 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 baked tobacco leaves. At present, the judgment of the moisture removal rate is generally qualitative according to the opening angle of a cold air door and the rotating speed of a fan, and the requirement of high-quality development of tobacco leaf curing cannot be met.
Disclosure of Invention
Aiming at the problem that the moisture removal rate of a tobacco leaf curing barn can not be accurately measured in the prior art, the invention provides the method and the system for measuring the moisture removal rate of the tobacco leaf curing barn, which can realize the accurate measurement of the moisture removal rate in the tobacco leaf curing process and are beneficial to realizing the accurate regulation and control of the moisture of the tobacco leaves in the curing process.
The invention is realized by the following technical scheme:
a method for measuring the moisture removal rate of a tobacco leaf curing barn comprises the following steps:
(1) measuring the length and the width of a moisture discharge port of the curing barn, and calculating the area S of the moisture discharge port as the length and the width;
(2) measuring the wind speed V of the moisture exhaust portWind power；
(3) Measuring and recording the dry bulb temperature T in the curing barn at the time of measurementInner trunkAnd wet bulb temperature TInternal dampness；
(4) Measuring and recording the dry bulb temperature and wet bulb temperature T of the external natural environment during measurementExternal stemAnd TExternal dampness；
(5) Will dry the temperature T of the ball in the curing barnInner trunkAnd wet bulb temperature TInternal dampnessDry bulb temperature T of the external natural environmentExternal stemAnd wet bulb temperature TExternal dampnessInputting the parameters into a wet air parameter calculator, and calculating to obtain the density rho of the wet and hot air discharged from the curing barnInner partMoisture content dInner partDensity rho of dry and cold air in natural environmentOuter coverMoisture content dOuter cover；
(6) Discharge rate V of damp and hot air in curing barn with moisture discharge portInternal humid air＝ρInner part*S*VWind power*3600；
The discharge volume of the damp and hot air in unit time is approximately equal to the inflow volume of the dry and cold air in unit time, and the external dry and cold air flows into the baking room at the speed VOutside air＝ρOuter cover*S*VWind power*3600；
Calculating the moisture discharge rate V in the damp and hot air at the moisture discharge portInner water＝VInternal humid air*dInner part/(1000+dInner part)；
Calculating the water inflow rate V in the outside dry and cold airExternal water＝VOutside air*dOuter cover/(1000+dOuter cover)；
Humidity discharging rate V of curing barnWater (W)＝VInner water-VExternal water＝VInternal humid air*dInner part/(1000+dInner part)—VOutside air*dOuter cover/(1000+dOuter cover)；
Substituting the parameters into a curing barn dehumidification rate formula to finally obtain the curing barn dehumidification rate:
Vwater (W)＝ρInner part*S*VWind power*3600*dInner part/(1000+dInner part)—ρOuter cover*S*VWind power*3600*dOuter cover/(1000+dOuter cover)。
The unit of the area S of the moisture discharging port is m2Density rho of hot and humid air discharged from the curing barnInner partDensity rho of dry and cold air in external natural environmentOuter coverUnit is kg/m3Velocity of wind VWind powerMoisture content d of the moist hot air discharged from the roasting room in m/sInner partMoisture content d of dry and cold air in external natural environmentOuter coverThe unit is g/kg dry air.
Further, theStep (2) measuring the wind speed V of a moisture exhaust port through a wind speed meterWind power。
Further, the step (3) is to measure and record the dry bulb temperature T in the curing barn by a dry-wet bulb thermometerInner trunkAnd wet bulb temperature TInternal dampnessPlacing dry-wet bulb thermometers at different positions in the curing barn, and taking the average value of the measured values at different positions as the dry-bulb temperature TInner trunkAnd wet bulb temperature TInternal dampness。
Further, the step (4) is to measure and record the dry bulb temperature and the wet bulb temperature T of the external natural environment during measurement by using a dry-wet bulb thermometerExternal stemAnd TExternal dampnessThe dry-wet bulb thermometers are arranged at different positions around the moisture exhaust port outside the curing barn, and the average value of the measured values at different positions is used as the dry-bulb temperature and the wet-bulb temperature T of the external natural environmentExternal stemAnd TExternal dampness。
The invention also provides a system for measuring the moisture-removing rate of the tobacco leaf curing barn, which comprises an anemoscope, a wet-dry bulb thermometer, a wet air parameter calculator, a PLC and a display, wherein the anemoscope, the wet-dry bulb thermometer, the wet air parameter calculator and the display are respectively connected with the PLC, the anemoscope is arranged at a moisture-removing port of the curing barn, and the measured wind speed V of the moisture-removing portWind powerUploading to a PLC, wherein a plurality of dry-wet bulb thermometers are respectively arranged in the curing barn and outside the curing barn, and the measured dry-wet bulb temperature T in the curing barnInner trunkAnd wet bulb temperature TInternal dampnessDry bulb temperature T of the external natural environmentExternal stemAnd wet bulb temperature TExternal dampnessUploading the density rho to a PLC (programmable logic controller), starting a wet air parameter calculator by the PLC, and calculating by the wet air parameter calculator to obtain the density rho of the hot and humid air discharged from the curing barnInner partMoisture content dInner partDensity rho of dry and cold air in natural environmentOuter coverMoisture content dOuter coverAnd the PLC is internally provided with a humidity-discharging rate calculation program of the curing barn: humidity discharging rate V of curing barnWater (W)＝VInner water-VExternal water＝VInternal humid air*dInner part/(1000+dInner part)—VOutside air*dOuter cover/(1000+dOuter cover) (ii) a Wherein, the discharging speed V of the damp and hot air in the curing barn with the moisture discharging portInternal humid air＝ρInner part*S*VWind power3600; speed V of external dry and cold air flowing into curing barnOutside air＝ρOuter cover*S*VWind power3600; moisture discharge rate V in moist hot air at moisture discharge portInner water＝VInternal humid air*dInner part/(1000+dInner part) (ii) a Moisture inflow rate V in external dry and cold airExternal water＝VOutside air*dOuter cover/(1000+dOuter cover) S is the area of a moisture exhaust port; and the display is used for displaying the humidity-discharging rate of the curing barn calculated by the PLC.
Further, the wet air parameter calculator is wet air parameter calculation software built in the PLC.
The invention has the following beneficial effects: the invention realizes the accurate measurement of the moisture removal rate of the curing barn, and the measurement system has simple structure and high automation degree; the invention is beneficial to realizing the accurate regulation and control of the moisture of the tobacco leaves in the baking process.
Drawings
FIG. 1 is a schematic diagram of a system for measuring moisture removal rate of a tobacco leaf bulk curing barn.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings.
Example 1
During the baking process in the baking room, the temperature T of the dry bulb is measuredInner trunkWet bulb temperature T42 ℃Internal dampnessThe moisture removal rate of the barn in the moisture removal state was calculated at 38 ℃.
Measuring the length and the width of a single moisture discharging opening of the curing barn to be 40cm and calculating the area of the single moisture discharging opening to be 0.16m2The total area S of the moisture discharge openings is 0.32m2。
Wind speed V of moisture discharging port is measured by anemometerWind power＝1.24m/s。
Determining the dry bulb temperature T of the external dry and cold air of the curing barnExternal stemWet bulb temperature T at 26 ℃External dampness＝22℃
Inputting dry bulb temperature T on wet air parameter calculatorInner trunk42 ℃ and wet bulb temperature TInternal dampnessCalculating the density rho of the damp and hot air exhausted from the curing barn at 38 DEG CInner part＝1.10kg/m3Moisture content dInner part41.61g/kg dry air.
Inputting dry bulb temperature T on wet air parameter calculatorExternal stem26 ℃ and wet bulb temperature TExternal dampnessThe density rho of the external dry and cold air is calculated at 22 DEG COuter cover＝1.17kg/m3Moisture content dOuter cover14.90g/kg dry air.
Substituting the above parameters into the following calculation formula:
humidity discharging rate V of curing barnWater (W)＝ρInner part*S*VWind power*3600*dInner part/(1000+dInner part)-ρOuter cover*S*VWind power*3600*dOuter cover/(1000+dOuter cover)
＝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: when the outside air dry bulb temperature is 26 ℃, the outside air wet bulb temperature is 22 ℃, the inside dry bulb temperature is 42 ℃ and the inside wet bulb temperature is 38 ℃, the baking room is in a moisture elimination state, and the moisture discharge rate in the baking room is 38.23 kg/h.
Example 2
A system for measuring the moisture removal rate of a tobacco leaf bulk curing barn is shown in figure 1 and comprises an anemoscope, a temperature and humidity measuring and controlling instrument, a wet air parameter calculator, a PLC and a display, wherein the anemoscope, 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.
The anemometer is arranged at the moisture exhaust port of the curing barn, and the wind speed V of the moisture exhaust port is measuredWind powerAnd uploading to the PLC. The intelligent dry-wet ball temperature measuring and controlling instruments are respectively arranged in the baking room and outside the baking room, and the measured dry-wet ball temperature T in the baking roomInner trunkAnd wet bulb temperature TInternal dampnessDry bulb temperature T of the external natural environmentExternal stemAnd wet bulb temperature TExternal dampnessUploading the density rho to a PLC (programmable logic controller), starting a wet air parameter calculator by the PLC, and calculating by the wet air parameter calculator to obtain the density rho of the hot and humid air discharged from the curing barnInner partMoisture content dInner partOutside natural environment dry and cold airDensity of gas ρOuter coverMoisture content dOuter cover。
A PLC built-in curing barn dehumidifying rate calculation program: humidity discharging rate V of curing barnWater (W)＝VInner water-VExternal water＝VInternal humid air*dInner part/(1000+dInner part)—VOutside air*dOuter cover/(1000+dOuter cover) (ii) a Wherein, the discharging speed V of the damp and hot air in the curing barn with the moisture discharging portInternal humid air＝ρInner part*S*VWind power3600; speed V of external dry and cold air flowing into curing barnOutside air＝ρOuter cover*S*VWind power3600; moisture discharge rate V in moist hot air at moisture discharge portInner water＝VInternal humid air*dInner part/(1000+dInner part) (ii) a Moisture inflow rate V in external dry and cold airExternal water＝VOutside air*dOuter cover/(1000+dOuter cover). Relevant parameters such as the area S of the moisture discharging opening can be set and modified through the input device of the PLC. And the display is used for displaying the humidity-discharging rate of the curing barn calculated by the PLC.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (6)
1. A method for measuring the moisture removal rate of a tobacco leaf curing barn is characterized by comprising the following steps:
(1) measuring the length and the width of a moisture discharge port of the curing barn, and calculating the area S of the moisture discharge port as the length and the width;
(2) measuring the wind speed V of the moisture exhaust portWind power；
(3) Measuring and recording the dry bulb temperature T in the curing barn at the time of measurementInner trunkAnd wet bulb temperature TInternal dampness；
(4) Measuring and recording the dry bulb temperature and wet bulb temperature T of the external natural environment during measurementExternal stemAnd TExternal dampness；
(5) Will dry in the curing barnBall temperature TInner trunkAnd wet bulb temperature TInternal dampnessDry bulb temperature T of the external natural environmentExternal stemAnd wet bulb temperature TExternal dampnessInputting the parameters into a wet air parameter calculator, and calculating to obtain the density rho of the wet and hot air discharged from the curing barnInner partMoisture content dInner partDensity rho of dry and cold air in natural environmentOuter coverMoisture content dOuter cover；
(6) Calculating the discharge rate V of damp and hot air in the curing barn with the moisture discharge portInternal humid air＝ρInner part*S*VWind power*3600；
The discharge volume of the damp and hot air in unit time is approximately equal to the inflow volume of the dry and cold air in unit time, and the external dry and cold air flows into the baking room at the speed VOutside air＝ρOuter cover*S*VWind power*3600；
Calculating the moisture discharge rate V in the damp and hot air at the moisture discharge portInner water＝VInternal humid air*dInner part/(1000+dInner part)；
Calculating the water inflow rate V in the outside dry and cold airExternal water＝VOutside air*dOuter cover/(1000+dOuter cover)；
Humidity discharging rate V of curing barnWater (W)＝VInner water-VExternal water＝VInternal humid air*dInner part/(1000+dInner part)—VOutside air*dOuter cover/(1000+dOuter cover)；
Substituting the parameters into a curing barn dehumidification rate formula to finally obtain the curing barn dehumidification rate:
Vwater (W)＝ρInner part*S*VWind power*3600*dInner part/(1000+dInner part)—ρOuter cover*S*VWind power*3600*dOuter cover/(1000+dOuter cover)；
The unit of the area S of the moisture discharging port is m2Density rho of hot and humid air discharged from the curing barnInner partDensity rho of dry and cold air in external natural environmentOuter coverUnit is kg/m3Velocity of wind VWind powerMoisture content d of the moist hot air discharged from the roasting room in m/sInner partMoisture content d of dry and cold air in external natural environmentOuter coverThe unit is g/kg dry air.
2. The method as set forth in claim 1, wherein the step (2) of determining the wind speed V at the moisture exhaust port by an anemometerWind power。
3. The method as set forth in claim 1, wherein the step (3) of measuring and recording the dry bulb temperature T in the roast room at the time of measurement with a dry-wet bulb thermometerInner trunkAnd wet bulb temperature TInternal dampnessPlacing dry-wet bulb thermometers at different positions in the curing barn, and taking the average value of the measured values at different positions as the dry-bulb temperature TInner trunkAnd wet bulb temperature TInternal dampness。
4. The method according to claim 1, wherein the step (4) of measuring and recording the dry bulb temperature and the wet bulb temperature T of the natural environment at the time of measurement with a dry-wet bulb thermometerExternal stemAnd TExternal dampnessThe dry-wet bulb thermometers are arranged at different positions around the moisture exhaust port outside the curing barn, and the average value of the measured values at different positions is used as the dry-bulb temperature and the wet-bulb temperature T of the external natural environmentExternal stemAnd TExternal dampness。
5. The system is characterized by comprising an anemoscope, a wet-dry bulb thermometer, a wet air parameter calculator, a PLC and a display, wherein the anemoscope, the wet-dry bulb thermometer, the wet air parameter calculator and the display are respectively connected with the PLC, the anemoscope is arranged at a moisture discharging port of a curing barn, and the wind speed V of the moisture discharging port is measuredWind powerUploading to a PLC, wherein a plurality of dry-wet bulb thermometers are respectively arranged in the curing barn and outside the curing barn, and the measured dry-wet bulb temperature T in the curing barnInner trunkAnd wet bulb temperature TInternal dampnessDry bulb temperature T of the external natural environmentExternal stemAnd wet bulb temperature TExternal dampnessUploading the density rho to a PLC (programmable logic controller), starting a wet air parameter calculator by the PLC, and calculating by the wet air parameter calculator to obtain the density rho of the hot and humid air discharged from the curing barnInner partMoisture content dInner partExternal natural environmentDensity of dry and cold air ρOuter coverMoisture content dOuter coverAnd the PLC is internally provided with a humidity-discharging rate calculation program of the curing barn: humidity discharging rate V of curing barnWater (W)＝VInner water-VExternal water＝VInternal humid air*dInner part/(1000+dInner part)—VOutside air*dOuter cover/(1000+dOuter cover) (ii) a Wherein, the discharging speed V of the damp and hot air in the curing barn with the moisture discharging portInternal humid air＝ρInner part*S*VWind power3600; speed V of external dry and cold air flowing into curing barnOutside air＝ρOuter cover*S*VWind power3600; moisture discharge rate V in moist hot air at moisture discharge portInner water＝VInternal humid air*dInner part/(1000+dInner part) (ii) a Moisture inflow rate V in external dry and cold airExternal water＝VOutside air*dOuter cover/(1000+dOuter cover) S is the area of a moisture exhaust port; and the display is used for displaying the humidity-discharging rate of the curing barn calculated by the PLC.
6. The assay system of claim 5, wherein the wet air parameter calculator is wet air parameter calculation software built into the PLC.
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Cited By (1)
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| CN115067537A (en) * | 2022-06-24 | 2022-09-20 | 青岛海尔空调电子有限公司 | Control method for a tobacco curing system and tobacco curing system |
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