CN117600078A - A method to characterize the processing strength of leaf shreds in a two-stage air separation machine - Google Patents
A method to characterize the processing strength of leaf shreds in a two-stage air separation machine Download PDFInfo
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- CN117600078A CN117600078A CN202311660852.9A CN202311660852A CN117600078A CN 117600078 A CN117600078 A CN 117600078A CN 202311660852 A CN202311660852 A CN 202311660852A CN 117600078 A CN117600078 A CN 117600078A
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B3/00—Preparing tobacco in the factory
- A24B3/18—Other treatment of leaves, e.g. puffing, crimpling, cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/02—Arrangement of air or material conditioning accessories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/04—Control arrangements
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Abstract
本发明公开了一种叶丝两级风选机加工强度的表征方法，是基于叶丝两级风选过程中传热传质的三个主要对象叶丝、循环气体和除尘气体进行分析，利用叶丝两级风选过程除尘风量与循环风量的比例来表征叶丝中低沸点成分的挥发量，同时利用循环气体的水分饱和度即含湿量来控制水分传质的速度，从叶丝两级风选过程叶丝与循环气体传质的总量和速度两个方面来表征叶丝两级风选机的加工强度。本发明采用量化方法表征叶丝风选过程中的加工强度，根据烤烟型卷烟产品质量特性与消耗需求，选择不同的叶丝两级风选机加工强度，有效指导卷烟加工工艺。The invention discloses a method for characterizing the processing strength of a two-stage air separation machine for blades. It is based on the analysis of the three main objects of heat and mass transfer in the two-stage air separation process: blades, circulating gas and dust removal gas. The ratio of dust removal air volume and circulating air volume in the two-stage leaf separation process is used to characterize the volatilization of low-boiling components in the leaves. At the same time, the water saturation of the circulating gas, that is, the moisture content, is used to control the speed of water mass transfer. The total amount and speed of mass transfer between the blades and circulating gas during the two-stage air separation process characterize the processing intensity of the two-stage air separation machine. The present invention uses a quantitative method to characterize the processing intensity of shredded leaves in the process of winnowing. According to the quality characteristics and consumption requirements of flue-cured cigarette products, different two-stage shredded shredded winnowing machine processing intensities are selected to effectively guide the cigarette processing technology.
Description
Technical Field
The invention relates to the field of cigarette cut-making processing, in particular to a method for representing the processing strength of a cut-leaf two-stage winnowing machine.
Background
The purity of cut tobacco is a permanently pursued target in the tobacco industry, and the purification processes of spectral impurity removal, metal detection, screening, winnowing and the like are widely applied to the cigarette cut tobacco making process. The two-stage winnowing of the cut tobacco has two basic functions: firstly, cooling and shaping the dried cut leaves, and improving the filling performance of the cut leaves; and secondly, removing light impurities (such as feathers and the like) and heavy impurities (such as stem sticks, scaling and the like) in the cut leaves.
In the tobacco industry, the two-stage winnowing and pneumatic conveying of cut tobacco are widely applied in the cigarette processing process, gas is used as a carrier and a heating medium to convey and dry materials in a pipeline, and the flowing of the gas directly provides energy for the movement of the materials. In the two-stage winnowing and pneumatic conveying processes of the cut tobacco, the cut tobacco is crushed due to the excessively high material movement speed, and the problems of uneven cut tobacco water content and layering of the cut tobacco are caused by the non-uniformity of gas-solid two phases.
Although the two-stage air separation of the shredded tobacco has the effects of improving the filling performance of the shredded tobacco, purifying the shredded tobacco and the like, the two-stage air separation of the shredded tobacco also has the defects of shredded tobacco, reduced sensory quality and the like. As the temperature of the materials is reduced before and after the two-stage winnowing of the cut tobacco, the sensory quality indexes such as aroma quantity, smoke sweetness, irritation, dry mouth feel and the like are obviously reduced.
The technical staff in the tobacco industry also explores the technologies of structural optimization, control mode improvement, cut tobacco flow, air quantity and the like of the cut tobacco two-stage air separation equipment, but the research on the processing strength of the cut tobacco two-stage air separation process has not been referred to the relevant reports.
The research for representing the processing strength in the two-stage winnowing process of the cut tobacco has positive significance for ascertaining the change rule in the two-stage winnowing process of the cut tobacco.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a characterization method of the processing strength of the cut tobacco two-stage winnowing machine, so that the processing strength of the cut tobacco two-stage winnowing machine can be accurately quantified, the cigarette processing technology can be effectively guided, and the problem that the processing strength of the cut tobacco two-stage winnowing machine cannot be quantitatively characterized can be solved.
The invention adopts the following technical scheme for realizing the purpose:
the invention relates to a characterization method of the processing strength of a cut tobacco two-stage winnowing machine, which is characterized by comprising the following steps:
step 1, after the wind power balance of a leaf shred two-stage winnowing machine is adjusted, a first measuring hole is formed in a horizontal section pipeline of a return air section of a circulating gas pipeline of the two-stage winnowing machine and used for measuring circulating gas in the horizontal section pipelineWind speed; a first detection point is arranged near the first measurement hole, and a temperature sensor, a first differential pressure gauge and a moisture content sensor are arranged at the first detection point and are respectively used for collecting the temperature value T of the circulating gas in the horizontal section pipeline on line 1 Differential pressure value ΔP 1 And moisture content H 1 ；
Step 2, calculating the density ρ of the circulating gas 1 ：
Step 2.1, calculating the partial pressure p of water vapor in the circulating gas according to the formula (1) q ：
In the formula (1): b is a standard atmospheric pressure value;
step 2.2, calculating the density ρ of the circulating gas according to formula (2) 1 ；
Step 3, calculating the velocity v of the circulating gas according to the formula (3) 1 ；
Step 4, calculating the mass flow M of the circulating gas according to the formula (4) 1 ；
In the formula (4), D 1 Representing the diameter of the return air section of the circulating gas pipeline;
step 5, a second measuring hole for dust-removing gas is formed in a vertical section pipeline of a dust-removing gas pipeline of the cut tobacco two-stage winnowing machine, and the second measuring hole is used for measuring the wind speed of the dust-removing gas in the vertical section pipeline; a second detection point is arranged near the second measuring hole and is atA second differential pressure gauge is arranged at the second detection point and is used for collecting the differential pressure value delta P of the dust removing gas in the vertical section pipe on line 2 Wherein the temperature value T of the dust removing gas 2 And the temperature value T of the circulating gas 1 The same moisture content H of the dust-removing gas 2 Moisture content H with the recycle gas 1 The same applies to the dust removal gas, the water vapor partial pressure p of the circulating gas q The same;
step 6, calculating the velocity v of the dust-removing gas according to the formula (5) 2 ；
Step 7, calculating the mass flow M of the dust removing gas according to the formula (6) 2 ；
In the formula (6), D 2 Representing the diameter of the dedusting gas pipeline;
step 8, calculating the characterization index of the processing intensity of the cut tobacco two-stage winnowing machine
The characterization method of the processing strength of the cut tobacco two-stage winnowing machine is also characterized in that the moisture content sensor in the step 1 is replaced by a relative humidity sensor of circulating gas, and the relative humidity RH of the circulating gas is collected on line 1 Thereby according to the temperature value T of the circulating gas 1 Calculating the saturated steam partial pressure P of the circulating gas by using the formula (7) s1 ：
In the formula (7), EXP represents a natural exponential function;
calculating the circulating gas according to the formula (8)Is a water vapor partial pressure p of q1 ；
p q1 ＝p s1 ×RH 1 (8)
The moisture content sensor of the dedusting gas in the step 5 is replaced by a relative humidity sensor of the dedusting gas, and the relative humidity RH of the dedusting gas 2 Relative humidity RH with the circulating gas 1 The same, saturated water vapor partial pressure P of the dust-removing gas s2 Partial pressure P of saturated steam with recycle gas s1 The same, the water vapor partial pressure p of the dust-removing gas q2 Partial pressure p of water vapor with circulating gas q1 The same applies.
In the step 1, the wind power balance of the two-stage cut tobacco winnowing machine is adjusted to negative pressure of-5 to-0 micro Pa by adjusting the feed inlet of the two-stage cut tobacco winnowing machine.
The processing intensity representation index A is between 10% and 30%, and is in direct proportion to the processing intensity of the cut tobacco two-stage winnowing machine.
The invention provides an electronic device comprising a memory and a processor, characterized in that the memory is arranged to store a program for enabling the processor to execute the characterization method, the processor being arranged to execute the program stored in the memory.
The invention relates to a computer-readable storage medium, on which a computer program is stored, characterized in that the computer program is executed by a processor to perform the steps of the characterization method.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for characterizing the processing strength of a cut tobacco two-stage winnowing machine, which adopts a technical index to characterize the processing strength of the cut tobacco two-stage winnowing process, wherein the index is related to the circulating gas flow and the dedusting gas flow in the cut tobacco two-stage winnowing process, and is characterized by utilizing the principles of conservation of material mass and conservation of heat in the cut tobacco two-stage winnowing process, from the chemical perspective of tobacco, according to the Dalton partial pressure law, utilizing the law of conservation of mass in the cut tobacco two-stage winnowing process and based on the original volatilization of aroma components in the cut tobacco two-stage winnowing processBy reason, three main object property analysis of mass transfer in the two-stage winnowing process of cut tobacco: the tobacco shred, the circulating gas and the dedusting gas are the sources for providing mass transfer and heat transfer in the two-stage winnowing process, and the circulating gas and the dedusting gas are the carriers for mass transfer and heat transfer in the two-stage winnowing process. Dust removal gas mass flow M 2 The smaller the circulating gas mass flow M 1 The greater the processing strength A value is, the smaller the processing strength A value is, the higher the saturation of the circulating gas serving as a moisture carrier in the cut tobacco is, the water dispersion stall degree of the cut tobacco in the two-stage winnowing process is reduced, the steam partial pressure of volatile components in the cut tobacco in the circulating gas can be increased, and the volatilization speed of low-boiling-point aroma components in the cut tobacco in the two-stage winnowing process is reduced, so that the loss of the aroma components in the cut tobacco is reduced.
Detailed Description
The present invention will be described in further detail with reference to examples, but the examples are not intended to limit the technical scope of the present invention.
Unless otherwise indicated, all technical terms referred to refer to version 2016 of the cigarette Process Specification written by the State tobacco specialty agency.
In this embodiment, a method for characterizing processing strength of a two-stage air separator for shredded tobacco is provided, which aims at the problem that low boiling point components in shredded tobacco are transferred to a circulating gas along with volatilization of moisture in shredded tobacco in an air separation process, meanwhile, the circulating gas carries tobacco dust in shredded tobacco to pass through a gas-solid separation filter screen, the density of the tobacco dust in a return air pipeline is higher than that of the circulating gas so as to be mainly distributed at the middle lower part of the return air pipeline, a dust removing pipeline arranged at the middle lower part of the return air pipeline brings the tobacco dust in the circulating gas to a dust remover through a dust removing gas with a certain flow rate, while the tobacco dust is discharged, moisture and low boiling point components in shredded tobacco can be discharged simultaneously, thereby causing reduction of flavor components of shredded tobacco after air separation.
And step 1, after the wind power balance of the two-stage leaf shred winnowing machine is adjusted, the feed inlet of the two-stage leaf shred winnowing machine is adjusted to negative pressure of-5 to-0 micro Pa. A first measuring hole is formed in a horizontal section pipeline of a return air section of a circulating gas pipeline of the two-stage winnowing machine and is used for measuring the wind speed of circulating gas in the horizontal section pipeline; a first detection point is arranged near the first measurement hole, and a temperature sensor, a first differential pressure gauge and a moisture content sensor are arranged at the first detection point and are respectively used for collecting the temperature value T of the circulating gas in the horizontal section pipeline on line 1 Differential pressure value ΔP 1 And moisture content H 1 。
Step 2, calculating the density ρ of the circulating gas 1 ：
Step 2.1, calculating the partial pressure p of water vapor in the circulating gas according to the formula (1) q ：
In the formula (1): b is a standard atmospheric pressure value.
Step 2.2, calculating the density ρ of the circulating gas according to formula (2) 1 ；
Step 3, calculating the velocity v of the circulating gas according to the formula (3) 1 ；
Step 4, calculating the mass flow M of the circulating gas according to the formula (4) 1 ；
(4)) In (D) 1 Indicating the diameter of the return section of the recycle gas line.
Step 5, a second measuring hole for dust-removing gas is formed in a vertical section pipeline of a dust-removing gas pipeline of the cut tobacco two-stage winnowing machine, and the second measuring hole is used for measuring the wind speed of the dust-removing gas in the vertical section pipeline; a second detection point is arranged near the second measurement hole, and a second differential pressure gauge is arranged at the second detection point and used for collecting the differential pressure value delta P of the dust removing gas in the vertical section pipe on line 2 Wherein the temperature value T of the dust removing gas 2 And the temperature value T of the circulating gas 1 The same moisture content H of the dust-removing gas 2 Moisture content H with the recycle gas 1 The same applies to the dust removal gas, the water vapor partial pressure p of the circulating gas q The same applies.
Step 6, calculating the velocity v of the dust-removing gas according to the formula (5) 2 ；
Step 7, calculating the mass flow M of the dust removing gas according to the formula (6) 2 ；
In the formula (6), D 2 Indicating the diameter of the dedusting gas line.
Step 8, calculating the characterization index of the processing intensity of the cut tobacco two-stage winnowing machine
The processing intensity A value of the two-stage leaf shred winnowing machine is between 10% and 30%, the internal quality of the leaf shred after the two-stage leaf shred winnowing is better, and the smoke irritation can be reduced to a certain extent by removing low-boiling-point components in part of the leaf shred on the basis of basically keeping the organoleptic quality characteristics of the leaf shred after the leaf shred is baked.
In particular implementation, the step 1 comprisesThe humidity sensor is replaced by a relative humidity sensor of the circulating gas for online acquisition of the relative humidity RH of the circulating gas 1 Thereby according to the temperature value T of the circulating gas 1 Calculating the saturated steam partial pressure P of the circulating gas by using the formula (7) s1 ：
In the formula (7), EXP represents a natural exponential function.
Calculating the partial pressure p of water vapor in the circulating gas according to formula (8) q1 ；
p q1 ＝p s1 ×RH 1 (8)
In this embodiment, the moisture content sensor of the dedusting gas in step 5 is replaced by a relative humidity sensor of the dedusting gas, and the relative humidity RH of the dedusting gas 2 Relative humidity RH with the circulating gas 1 The same, saturated water vapor partial pressure P of the dust-removing gas s2 Partial pressure P of saturated steam with recycle gas s1 The same, the water vapor partial pressure p of the dust-removing gas q2 Partial pressure p of water vapor with circulating gas q1 The same applies.
Example 1
Step 1, the cut tobacco moisture content of the cut tobacco after the yellow mountain A brand thin plate is dried and entering the two-stage winnowing machine is 12.94%, the material flow before the cut tobacco enters the two-stage winnowing machine is about 3380kg/h, and the discharged cut tobacco moisture content after the two-stage winnowing of the cut tobacco is 12.41%.
And 2, adjusting the wind power balance of the two-stage leaf shred winnowing machine to adjust the feeding opening of the two-stage leaf shred winnowing machine to be slightly negative pressure-5 to-0 micro Pa, wherein the feeding opening of the two-stage leaf shred winnowing machine has no positive pressure. A horizontal section pipeline positioned at the return air section of the circulating gas pipeline of the two-stage winnowing machine is provided with a circulating gas measuring hole which is used as a circulating gas wind speed detecting point; the vertical section pipeline of the dedusting gas pipeline of the two-stage winnowing machine is provided with a dedusting gas measuring hole which is used as a dedusting gas wind speed detecting point, and a dedusting gas differential pressure gauge is arranged at the circulating detecting point.
Measuring the pipe diameter D of a circulating gas pipe 1 600mm; differential pressure detection value delta P of online differential pressure meter 1 104.3Pa; the temperature t=36.2 ℃ at the circulating gas wind speed detection point is acquired with a temperature sensor.
Measuring the pipe diameter D of a dust-removing gas pipeline 2 300mm; differential pressure detection value delta P of online differential pressure meter 2 20.3Pa.
Step 3, collecting the relative humidity RH of the circulating gas on line 1 45.85%, the concrete steps are as follows:
first, by circulating the relative humidity RH of the gas 1 And temperature T 1 Calculating the gas density ρ according to the formulas (7), (8) and (2) 1 1.1280kg/m 3 ；
Step 4, detecting a pressure difference detection value delta P through a circulating gas on-line pressure difference meter 1 And gas density ρ 1 Calculating the velocity v of the circulating gas according to the formula (4) 1 13.62m/s.
Step 5, calculating according to the formula (4) to obtain the circulating gas mass flow M 1 15640kg/h.
Step 6, detecting a pressure difference detection value delta P through a dust removal gas online pressure difference meter 2 And a dust removal gas density ρ 2 Calculating the velocity v of the circulating gas according to the formula (5) 1 6.0m/s.
Step 7, calculating according to the formula (6) to obtain the dust removal gas mass flow M 2 1722.5kg/h;
and 8, calculating a characterization index A of the processing intensity of the burley tobacco roasting machine to be 11.0%.
After the Huangshan A brand thin plate is dried, the leaf shreds are subjected to two-stage winnowing through the combination of the process parameters, and because the dust removal gas mass flow is reasonable in design, the leaf shreds run smoothly in the two-stage winnowing equipment, the leaf shreds are small in breakage, the dust removal of tobacco dust is smooth, and no tobacco dust remains in a dust removal pipeline.
The sensory quality of the cut tobacco after the two-stage winnowing is combined by adopting the technical parameters, so that the sweet feeling of the smoke is better, the fragrance texture is slightly improved, the fragrance loss is less, the smoke concentration is slightly higher, and the sensory quality of the cut tobacco after the two-stage winnowing is better as a whole.
The above description is illustrative of the invention and is not intended to be limiting, but is to be construed as being included within the spirit and scope of the invention.
Claims (7)
1. A characterization method of the processing strength of a cut tobacco two-stage winnowing machine is characterized by comprising the following steps:
step 1, after the wind power balance of a cut tobacco two-stage winnowing machine is adjusted, a first measuring hole is formed in a horizontal section pipeline of a return air section of a circulating gas pipeline of the two-stage winnowing machine and used for measuring the wind speed of circulating gas in the horizontal section pipeline; a first detection point is arranged near the first measurement hole, and a temperature sensor, a first differential pressure gauge and a moisture content sensor are arranged at the first detection point and are respectively used for collecting the temperature value T of the circulating gas in the horizontal section pipeline on line 1 Differential pressure value ΔP 1 And moisture content H 1 ；
Step 2, calculating the density ρ of the circulating gas 1 ：
Step 2.1, calculating the partial pressure p of water vapor in the circulating gas according to the formula (1) q ：
In the formula (1): b is a standard atmospheric pressure value;
step 2.2, calculating the density ρ of the circulating gas according to formula (2) 1 ；
Step 3, calculating the velocity v of the circulating gas according to the formula (3) 1 ；
Step 4, calculating the mass flow M of the circulating gas according to the formula (4) 1 ；
In the formula (4), D 1 Representing the diameter of the return air section of the circulating gas pipeline;
step 5, a second measuring hole for dust-removing gas is formed in a vertical section pipeline of a dust-removing gas pipeline of the cut tobacco two-stage winnowing machine, and the second measuring hole is used for measuring the wind speed of the dust-removing gas in the vertical section pipeline; a second detection point is arranged near the second measurement hole, and a second differential pressure gauge is arranged at the second detection point and used for collecting the differential pressure value delta P of the dust removing gas in the vertical section pipe on line 2 Wherein the temperature value T of the dust removing gas 2 And the temperature value T of the circulating gas 1 The same moisture content H of the dust-removing gas 2 Moisture content H with the recycle gas 1 The same applies to the dust removal gas, the water vapor partial pressure p of the circulating gas q The same;
step 6, calculating the velocity v of the dust-removing gas according to the formula (5) 2 ；
Step 7, calculating the mass flow M of the dust removing gas according to the formula (6) 2 ；
In the formula (6), D 2 Representing the diameter of the dedusting gas pipeline;
step 8, calculating the characterization index of the processing intensity of the cut tobacco two-stage winnowing machine
2. The method for characterizing the processing strength of a two-stage air separator for shredded tobacco as recited in claim 1 wherein the moisture content sensor in step 1 is replaced by a relative humidity sensor for circulating gas for on-line acquisition of the relative humidity RH of the circulating gas 1 Thereby according to the temperature value T of the circulating gas 1 Calculating the saturated steam partial pressure P of the circulating gas by using the formula (7) s1 ：
In the formula (7), EXP represents a natural exponential function;
calculating the partial pressure p of water vapor in the circulating gas according to formula (8) q1 ；
p q1 ＝p s1 ×RH 1 (8)。
3. The method for characterizing the processing strength of a two-stage fan for shredded tobacco as recited in claim 2, wherein the moisture content sensor of the dust removing gas in step 5 is replaced with a relative humidity sensor of the dust removing gas, and the relative humidity RH of the dust removing gas 2 Relative humidity RH with the circulating gas 1 The same, saturated water vapor partial pressure P of the dust-removing gas s2 Partial pressure P of saturated steam with recycle gas s1 The same, the water vapor partial pressure p of the dust-removing gas q2 Partial pressure p of water vapor with circulating gas q1 The same applies.
4. The method for characterizing the processing strength of a cut tobacco two-stage winnowing machine according to claim 1, wherein the method comprises the following steps: in the step 1, the wind power balance of the two-stage cut tobacco winnowing machine is adjusted to negative pressure of-5 to-0 micro Pa by adjusting the feed inlet of the two-stage cut tobacco winnowing machine.
5. The method for characterizing the processing strength of a cut tobacco two-stage winnowing machine according to claim 1, wherein the method comprises the following steps: the processing intensity representation index A is between 10% and 30%, and is in direct proportion to the processing intensity of the cut tobacco two-stage winnowing machine.
6. An electronic device comprising a memory and a processor, wherein the memory is configured to store a program that supports the processor to perform the characterization method of any of claims 1-5, the processor being configured to execute the program stored in the memory.
7. A computer readable storage medium having a computer program stored thereon, characterized in that the computer program when executed by a processor performs the steps of the characterization method according to any of claims 1-5.
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| CN202052702U (en) * | 2011-05-03 | 2011-11-30 | 上虞市晨光食品机械有限公司 | Winnowing machine |
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