CN106974317A - A kind of control method of hot blast leaves moisting equipment - Google Patents
A kind of control method of hot blast leaves moisting equipment Download PDFInfo
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- CN106974317A CN106974317A CN201610025907.2A CN201610025907A CN106974317A CN 106974317 A CN106974317 A CN 106974317A CN 201610025907 A CN201610025907 A CN 201610025907A CN 106974317 A CN106974317 A CN 106974317A
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- hot blast
- moisture content
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- setting value
- tobacco
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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
- A24B3/04—Humidifying or drying tobacco bunches or cut tobacco
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
Abstract
A kind of control method of hot blast leaves moisting equipment.The invention belongs to Cigarette processing technique, and in particular to beating and double roasting produces the control method of hot blast leaves moisting equipment.This method is, according to hot air conditioning cylinder tobacco export moisture content and the difference x of entering water rate, four continuous but misaligned range intervals are set out from big to small, that is x ∈ [a, + ∞) it is scope one, x ∈ [b, a) it is scope two, x ∈ [0, b) it is scope three, x ∈ [- ∞, 0) it is scope four, wherein 0 ＜ b ＜ a, by the difference of surveyed scope, are adjusted to the humidification amount of equipment, hot blast temperature, return air temperature these three intermediate variables correspondence.The present invention method it is possible to prevente effectively from multi-parameter blindly adjustment bring interfere, attend to one thing and lose sight of another, process relativity fluctuation it is larger the problem of.Grading control pattern is advantageously implemented " targeting " quickly adjustment control, each state modulator and conversion is carried out in order.
Description
Technical field
The invention belongs to Cigarette processing technique, and in particular to beating and double roasting produces the control method of hot blast leaves moisting equipment.
Background technology
Hot blast leaves moisting is a very important manufacturing procedure in beating and double roasting production process, the process task of the process is the temperature and moisture for improving tobacco leaf, improve the mechanical resist processing intensity of tobacco leaf, its part aesthetic quality is obtained a certain degree of improvement simultaneously, be following process processing preparatory technology condition.The controlling whether of hot blast leaves moisting production process key process parameter quick response and can reach stable state, and the economic and technical norms such as the quality of tobacco leaf, material process loss after processing are suffered from directly affecting.
The control of hot blast leaves moisting process crudy is always one of emphasis of tobacco redrying manufacturing enterprise concern.Because hot blast leaves moisting equipment needs the rolling for realizing processing materials loose and stirring warming and humidifying, therefore the hot blast leaves moisting equipment of beating and double roasting production generally uses drum-type hot air conditioning cylinder.It is mainly made up of input and output material cover, cylinder, vapour system, hot air circulating system, water-adding system and electric-control system.The equipment operation principle is：There is independent direct-injection steam jet at drum inlet end, " water-steam " mixing nozzle and and hot-blast spray nozzle, tobacco leaf material enters drum-type hot air conditioning cylinder drums inside through charging cover, the damp and hot mixed airflow of the air-flow formation sprayed simultaneously with three road nozzles is mixed in the relatively closed hot and humid environment that roller is formed, tobacco leaf material is constantly stirred under the collective effect of the roller with certain inclination angle and drum inner surface spiral distribution harrow nail, throwing dissipates to be done during approximate helical moves to the port of export, fully absorb temperature, moisture, so that material is brought rapidly up and moisture absorption.
In produce reality, hot air conditioning cylinder process quality generally is characterized using two important physical indexs of material water ratio and temperature, the control method generally used at present is：
1st, it is the tobacco leaf moisture content by detecting hot air conditioning cylinder entrance, exporting to the control of tobacco leaf moisture content, amount of water control is carried out using double closed-loop PID, the mode that adds water uniformly is sprayed at tobacco leaf surface to be atomized moisture by saturated vapor.
2nd, to the control of tobacco leaf temperature, mainly tobacco leaf temperature is controlled by controlling hot blast temperature and return air temperature in technique.（1）The quantity of steam for being adjusted into heat exchanger using PID controller makes hot blast temperature reach standard requirement.(2) the direct-injection quantity of steam control return air temperature added in leaves moisting cylinder is adjusted using PID controller and reaches standard requirement.
The control of tobacco leaf humidification amount, hot blast temperature and return air temperature is three sets of separate systems, independent PID controller is respectively adopted control is adjusted.And the medium processed has hot blast, saturated vapor and water, regulation add quantity of steam number come adjust return air temperature it is up to standard while, contained vapor also results in material moisture change in steam, while influence can also be produced on tobacco sensory quality.Need to be adjusted control to three parameters often in actual production, due to lacking the grading control pattern taken according to the difference interval of tobacco export moisture content and entering water rate, by rule of thumb and blindness adjusting parameter, the phenomenon generally existing for interfering, attending to one thing and lose sight of another between parameters is easily caused, causes tobacco leaf moisture content and temperature quality index in process, the problem of tobacco sensory quality fluctuation is larger after processing.
For the deficiency of current hot air conditioning cylinder control method, associated control parameters are optimized by combination with the theory of " grading control ", form more scientific and reasonable control model, to abundant and development beating and double roasting process, lifting beating and double roasting process technology level has a very important role and meaning.
The content of the invention
In order to solve the above problems, the present invention provides a kind of hot air conditioning cylinder hierarchical control method, this method is interval according to the difference of tobacco export moisture content and entering water rate, set out a kind of control preferred selection order power, the intermediate variables such as tobacco leaf humidification amount, hot blast temperature, return air temperature are made to be adjusted according to the state of tobacco export moisture content and temperature, so as to obtain more stable tobacco leaf crudy and aesthetic quality.
The technical solution adopted in the present invention is：The difference of tobacco export moisture content and entering water rate is first subjected to interval division, the control model of each interval correspondence different levels, under each level control model, different control models is used to humidification amount, hot blast temperature, return air temperature, a set of hierarchical control method is formed.
The present invention particular content be：According to hot air conditioning cylinder tobacco export moisture content and the difference x of entering water rate, four continuous but misaligned range intervals, i.e. x ∈ [a are set out from big to small, + ∞) it is scope one, [b, a) is scope two, x ∈ [0 to x ∈, b) it is scope three, x ∈ [- ∞, 0) it is scope four, wherein 0 ＜ b ＜ a, by the difference of surveyed scope, the humidification amount of equipment, hot blast temperature, return air temperature these three intermediate variables correspondence are adjusted：
（1）In scope for the moment, fixed original hot blast temperature setting value is constant by x, with single closed loop PID control mode, the quantity of steam of heat exchanger is entered by adjusting, hot blast temperature is reached setting value；By single closed loop PID control mode, the size of direct-injection quantity of steam is adjusted, to control and stablize return air temperature, return air temperature is reached setting value；Calculated by the numerical value of the tobacco export moisture content gathered in real time, tobacco leaf entering water rate, tobacco leaf inlet flow rate, the real-time amount of water calculated as inner ring PID in two-loop system setting value, by the size for adjusting amount of water, to control tobacco export moisture content, use a mouthful moisture content and reach setting value.
（2）When x is in scope two, according to the difference and the difference of tobacco leaf degree of b values, amount of water is set as less fixed value W, wherein W>0；Tobacco export moisture content is controlled by changing the size of direct-injection quantity of steam, tobacco leaf moisture content is reached setting value；Fixed original return air temperature setting value is constant, return air temperature is controlled by changing the setting value of hot blast temperature, the regulation of hot blast temperature is realized with single closed loop PID control mode.
（3）When x is in scope three, amount of water is set as 0, steam mixing nozzle is closed.Tobacco export moisture content is controlled by changing the size of direct-injection quantity of steam, tobacco leaf moisture content is reached setting value；Fixed original return air temperature setting value is constant, return air temperature is controlled by changing the setting value of hot blast temperature, the regulation of hot blast temperature is realized with single closed loop PID control mode.
（4）When x is in scope four, amount of water is set as 0, steam mixing nozzle is closed.Direct-injection quantity of steam is also set to 0, closes direct-injection steam jet.It is same to use hot blast temperature PID control method, by changing the setting value of hot blast temperature, allow hot blast to take away moisture unnecessary in tobacco leaf in the way of improving hot blast temperature, to control tobacco export moisture content, tobacco leaf moisture content is reached setting value.
According to the tobacco leaf characteristic of different cultivars grade, hot air conditioning cylinder tobacco export moisture content and a of the difference of entering water rate are that 2~4%, b is 1~2%.
Pass through above-mentioned level Four control model, it is interval according to where the difference of tobacco export moisture content and entering water rate, system is accordingly controlled using corresponding control hierarchy, so as to realize the selection conversion of outlet moisture content each level control system in order, make the control of material water ratio more accurate, quick and stably.
The method have the benefit that：By the tobacco export moisture control of hot air conditioning cylinder, the related humidification control system of tobacco leaf temperature control, hot blast control system, the control of return air temperature control system are controlled by the difference interval of tobacco export moisture content and entering water rate using grading control pattern, it is possible to prevente effectively from multi-parameter blindly adjustment bring interfere, attend to one thing and lose sight of another, the problem of process relativity fluctuation is larger.Grading control pattern is advantageously implemented " targeting " quickly adjustment control, each state modulator and conversion is carried out in order.
Embodiment
Embodiment：Assuming that when carrying out interval division setting according to hot air conditioning cylinder tobacco export moisture content and the difference x of entering water rate, a=3%, b=1%, then.
（1）When x >=3%（Scope one）When, illustrate tobacco leaf entering water rate very little, tobacco leaf need to be added water in large quantities, and suitably plus steam, now system is adjusted into first order control model, the control model used for：Fixed hot blast temperature, is controlled by adjusting direct-injection quantity of steam and stablizes return air temperature, tobacco export moisture content is controlled by controlling amount of water.
（2）As 1%≤x ＜ 3%（Scope two）When, illustrate that tobacco leaf entering water rate is smaller, only tobacco leaf need on a small quantity be added water, then pass through contain in applied steam moisture content compensation can meet to tobacco leaf humidification requirement, now system be adjusted into second level control model, the control model used for：According to the difference and the difference of tobacco leaf degree of b values, amount of water is set as less fixed value W, tobacco export moisture content is controlled by adjusting direct-injection quantity of steam, return air temperature is adjusted by adjusting hot blast temperature.
（3）As 0≤x ＜ 1%（Scope three）When, illustrate that tobacco leaf entering water rate closely exports moisture content, now without being added water to tobacco leaf, as long as the requirement humidified to tobacco leaf can be met by applying the moisture content contained in steam compensation by control, now system is adjusted into third level control model, the control model used for：Amount of water is set as 0, adding a small amount of steam by adjusting direct-injection quantity of steam controls tobacco export moisture content, and return air temperature is adjusted by controlling hot blast temperature.
（4）As x ＜ 0（Scope four）When, illustrate that tobacco leaf entering water rate is more than outlet moisture content, now tobacco leaf can not only be added water plus steam, in order to reach the outlet moisture content of requirement, the moisture of excess in tobacco leaf must also be taken away by the desiccation of hot blast, now system is adjusted into fourth stage control model, the control model used for：Amount of water is set as 0, direct-injection steam adds consumption to be also set to 0, takes away the moisture of excess in tobacco leaf by adjusting and improving hot blast temperature, reach required tobacco export moisture content.
Claims (2)
1. a kind of control method of hot blast leaves moisting equipment, it is characterized in that：According to hot air conditioning cylinder tobacco export moisture content and the difference x of entering water rate, four continuous but misaligned range intervals, i.e. x ∈ [a are set out from big to small, + ∞) it is scope one, [b, a) is scope two, x ∈ [0 to x ∈, b) it is scope three, x ∈ [- ∞, 0) it is scope four, wherein 0 ＜ b ＜ a, by the difference of surveyed scope, the humidification amount of equipment, hot blast temperature, return air temperature these three intermediate variables correspondence are adjusted；1. x is in scope a period of time, and fixed original hot blast temperature setting value is constant, with single closed loop PID control mode, the quantity of steam of heat exchanger is entered by adjusting, hot blast temperature is reached setting value；By single closed loop PID control mode, the size of direct-injection quantity of steam is adjusted, to control and stablize return air temperature, return air temperature is reached setting value；Calculated by the numerical value of the tobacco export moisture content gathered in real time, tobacco leaf entering water rate, tobacco leaf inlet flow rate, the real-time amount of water calculated as inner ring PID in two-loop system setting value, by the size for adjusting amount of water, to control tobacco export moisture content, use a mouthful moisture content and reach setting value；2. when x is in scope two, according to the difference of actual b values and tobacco leaf degree, the conventional corresponding amount of water of setting；Tobacco export moisture content is controlled by changing the size of direct-injection quantity of steam, tobacco leaf moisture content is reached setting value；Fixed original return air temperature setting value is constant, return air temperature is controlled by changing the setting value of hot blast temperature, the regulation of hot blast temperature is realized with single closed loop PID control mode；3. when x is in scope three, amount of water is set as 0, steam mixing nozzle is closed；Tobacco export moisture content is controlled by changing the size of direct-injection quantity of steam, tobacco leaf moisture content is reached setting value；Fixed original return air temperature setting value is constant, return air temperature is controlled by changing the setting value of hot blast temperature, the regulation of hot blast temperature is realized with single closed loop PID control mode；4. when x is in scope four, amount of water is set as 0, steam mixing nozzle is closed；Direct-injection quantity of steam is also set to 0, closes direct-injection steam jet；It is same to use hot blast temperature PID control method, by changing the setting value of hot blast temperature, allow hot blast to take away moisture unnecessary in tobacco leaf in the way of improving hot blast temperature, to control tobacco export moisture content, tobacco leaf moisture content is reached setting value.
2. the control method of the hot blast leaves moisting equipment as described in claim 1, it is characterized in that：The a of the difference of hot air conditioning cylinder tobacco export moisture content and entering water rate is that 2~4%, b is 1~2%.
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| CN201610025907.2A CN106974317B (en) | 2016-01-15 | 2016-01-15 | A kind of control method of hot wind leaves moisting equipment |
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| CN201610025907.2A CN106974317B (en) | 2016-01-15 | 2016-01-15 | A kind of control method of hot wind leaves moisting equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108378406A (en) * | 2018-04-11 | 2018-08-10 | 红塔烟草(集团)有限责任公司 | Smoked sheet multiple roasting machine moisture regain area's temperature/humidity control method and its system |
| CN115016568A (en) * | 2022-06-20 | 2022-09-06 | 浙江中烟工业有限责任公司 | Temperature control method for outlet of leaf moistening machine based on temperature division area accumulation strategy |
| CN115053975A (en) * | 2022-06-15 | 2022-09-16 | 浙江中烟工业有限责任公司 | PID (proportion integration differentiation) associated control method for outlet moisture temperature of loosening and wetting machine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108378406A (en) * | 2018-04-11 | 2018-08-10 | 红塔烟草(集团)有限责任公司 | Smoked sheet multiple roasting machine moisture regain area's temperature/humidity control method and its system |
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| CN115053975B (en) * | 2022-06-15 | 2023-08-22 | 浙江中烟工业有限责任公司 | PID (proportion integration differentiation) associated control method for outlet moisture temperature of loosening and leaf wetting machine |
| CN115016568A (en) * | 2022-06-20 | 2022-09-06 | 浙江中烟工业有限责任公司 | Temperature control method for outlet of leaf moistening machine based on temperature division area accumulation strategy |
| CN115016568B (en) * | 2022-06-20 | 2024-04-02 | 浙江中烟工业有限责任公司 | Temperature control method for outlet of leaf-wetting machine based on area accumulation strategy of temperature division area |
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