CN203181983U - Tobacco moistening machine - Google Patents
Tobacco moistening machine Download PDFInfo
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- CN203181983U CN203181983U CN 201220737276 CN201220737276U CN203181983U CN 203181983 U CN203181983 U CN 203181983U CN 201220737276 CN201220737276 CN 201220737276 CN 201220737276 U CN201220737276 U CN 201220737276U CN 203181983 U CN203181983 U CN 203181983U
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Abstract
The utility model particularly discloses a tobacco moistening machine which comprises a heat exchanger and a tobacco moistening cylinder. An inlet and an outlet of the tobacco moistening cylinder are provided with an inlet steam valve and an outlet steam valve respectively. The tobacco moistening machine is characterized by further comprising a first forecast PI controller. The inlet steam valve and the outlet steam valve are connected with the output end of the first forecast PI controller. The outlet of the tobacco moistening cylinder is provided with a tobacco water content detecting device connected with the input end of the first forecast PI controller. Aperture limit values of the inlet steam valve and the outlet steam valve are stored in the first forecast PI controller. The first forecast PI controller can control the aperture of the inlet steam valve and the aperture of the outlet steam valve according to the aperture limit values and the water content of the tobacco at the outlet of the tobacco moistening cylinder. The forecast PI controller has the advantages of forecasting an output signal in a large lag process and hindering and measuring noise. The forecast PI controller is suitable for stable control of a large lag objective. Automatic control of water content in the tobacco moistening process is achieved, on-spot technique control capability is improved and tobacco redrying quality is integrally improved.
Description
Technical field
The utility model relates to the beating and double roasting technical field, is specifically related to a kind of tobacco leaf tobacco leaf moisting machine.
Background technology
The tobacco redrying process is interference more than, close coupling, large time delay, non-linear, uncertain big thermal capacitance process.In process of production, exist heat transfer medium (hot gas) with uniform temperature, humidity, pressure, flow velocity all the time and in the relative motion process, heat exchange action takes place with tobacco leaf, thereby reach the purposes such as drying, cooling, moisture regain of tobacco leaf.Tobacco redrying comprises leaves moisting and two emphasis process sections of roasting sheet, and leaves moisting realizes by tobacco leaf moisting machine that generally roasting sheet realizes by roasting sheet machine that generally roasting sheet machine generally comprises dry section, cold-zone, ordering room.Arbitrary zone temperatures of various process, the variation of humidity all can have influence on the variation of each section parameter thereafter and the variation of outlet moisture content in leaves content, and this becomes quite complicated with regard to the mechanism model that makes the system of foundation, is in particular in the following aspects:
1) disturbing factor is many: the moisture of entrance tobacco leaf, temperature, the place of production, kind, grade have very important influence to moisture content of outlet; Pressure, temperature and the degree of saturation of heating steam and moisture regain steam directly influences moisture and the temperature of outlet tobacco leaf; The temperature of surrounding air, humidity also have bigger remote-effects to moisture content in leaves and the temperature of cooling stage.
2) the production process characteristic is changeable: be subjected to anterior influence of beating the leaf process, the speed of tobacco leaf feed rate, tobacco leaf feeding machine needs to adjust to satisfy produce continuous sometimes, changes with regard to the characterisitic parameter that has caused process like this; Simultaneously, tobacco redrying is worked under environment such as high temperature, high humidity and dust, and equipment also can take place unusually, and in this case, operating personnel need change technological operation at any time, make process characteristic have diversity, are difficult to realize stable PID closed-loop control.
3) control of moisture is a large time delay process: often after moisture content of outlet changed, it was untimely it being controlled again, and the direct result that causes is that moisture fluctuates up and down in setting value, can not stablize.
The existence of above reason has increased the difficulty of redrying moisture content of outlet control, and pid control algorithm itself has a lot of limitation, be non-minimum phase system with reverse characteristic, have serious frequent procedures system, multivariable strongly coupled system, the control system that has constraint and a Large-lag System of disturbing as it, use the closed-loop control that simple pid control algorithm carries out even can not guarantee the stable of system, let alone the precision of control.
In classical control system, it more pays attention to the monomer running of equipment and the chain operation between the equipment, still adopt traditional pid algorithm at specific control loop, and these control loops have independence of one's own, ignored " force action " between multifactor, for example: the moisture content of roasting sheet outlet tobacco leaf largely is subjected to influencing jointly of each control loop.And if by control manually, because experience difference, the stabilization time of operative employee's control line of varying level is different in size, veteran operative employee often abandons the automatic PID of computer and regulates and control with the experience of oneself fully.Have only by creating out production models accurately, various factors and correlation thereof are all included in whole system take all factors into consideration, could realize outstanding control effect.
The utility model content
The technical problem that the utility model solves is to overcome the deficiencies in the prior art, provides a kind of tobacco leaf leaves moisting process is carried out temperature auto control, can promote the tobacco leaf tobacco leaf moisting machine of control accuracy.
For solving the problems of the technologies described above, the technical solution of the utility model is as follows:
A kind of tobacco leaf tobacco leaf moisting machine, comprise heat exchanger and leaves moisting tube, entrance and exit difference inlet porting steam valve and outlet steam valve at described leaves moisting tube also comprise first predictive PI controller, and the inlet steam valve all is connected with the first predictive PI controller output with the outlet steam valve; Leaves moisting tube exit also is provided with the moisture content in leaves checkout gear that is connected with the first predictive PI controller input, also store the aperture limiting value of inlet steam valve and outlet steam valve in first predictive PI controller, first predictive PI controller is according to the aperture of moisture content in leaves control inlet steam valve and the outlet steam valve in aperture limiting value and leaves moisting tube exit.The utility model is by controlling automatically the moisture in the tobacco leaf leaves moisting process, to promote moisture and control accuracy of temperature in the tobacco leaf leaves moisting process.
Preferably, also comprise second predictive PI controller, store leaves moisting tube tobacco leaf desired temperature in first predictive PI controller, store the hot blast temperature setting value in second predictive PI controller, the outlet of leaves moisting tube is provided with the first tobacco leaf temperature measuring equipment, be provided with the hot blast temperature measurement mechanism in the heat exchanger, the first tobacco leaf temperature measuring equipment is connected with the input of first predictive PI controller, the output of first predictive PI controller is connected with the input of hot blast temperature measurement mechanism with second predictive PI controller, and the output of second predictive PI controller is connected with heat exchanger.
Preferably, described leaves moisting tube porch also is provided with the feed rate signal supervisory instrument that is connected with the first predictive PI controller input, and first predictive PI controller is according to the humidification quantity of steam in feed rate signal and the moisture content of outlet adjusting tobacco leaf moisting machine.
Preferably, entrance and exit at described tobacco leaf moisting machine arranges inlet steam valve and the outlet steam valve that all is connected with the first predictive PI controller output respectively, the tobacco leaf moisting machine exit also is provided with the moisture content in leaves checkout gear that is connected with the first predictive PI controller input, also store the aperture limiting value of inlet steam valve and outlet steam valve in first predictive PI controller, first predictive PI controller is according to the aperture of moisture content in leaves control inlet steam valve and the outlet steam valve in aperture limiting value and tobacco leaf moisting machine exit.The utility model is also controlled automatically to the tobacco leaf feed rate of tobacco leaf leaves moisting process.
Compared with prior art, the beneficial effect of technical solutions of the utility model is:
(1) predictive PI controller in the utility model adopts the predictive PI control algolithm that tobacco leaf leaves moisting process is controlled, compare with common pid algorithm, output signal and the advantage that suppresses to measure noise that it has prediction large time delay process are suitable for the steady control of large time delay object.
(2) the utility model adopts predictive PI controller to realize tobacco leaf leaves moisting process moisture and temperature auto control, comprises that moisture, the temperature to a profit, two profits jointly controls, and improves on-the-spot technology controlling and process ability, the whole tobacco redrying crudy that promotes.
Description of drawings
Fig. 1 is the structural representation of in the tobacco leaf tobacco leaf moisting machine of the present utility model leaves moisting moisture being controlled.
Fig. 2 is to the temperature controlled structural representation of leaves moisting in the tobacco leaf tobacco leaf moisting machine of the present utility model.
The specific embodiment
Below in conjunction with drawings and Examples the technical solution of the utility model is described further.
As illustrated in fig. 1 and 2, be part Organization Chart of the present utility model.
As illustrated in fig. 1 and 2, a kind of tobacco leaf tobacco leaf moisting machine, comprise heat exchanger 3 and leaves moisting tube, entrance and exit difference inlet porting steam valve and outlet steam valve at the leaves moisting tube, also comprise first predictive PI controller 1, the inlet steam valve all is connected with first predictive PI controller, 1 output with the outlet steam valve; Leaves moisting tube exit also is provided with the moisture content in leaves checkout gear that is connected with first predictive PI controller, 1 input, also store the aperture limiting value of inlet steam valve and outlet steam valve in first predictive PI controller 1, first predictive PI controller 1 is according to the aperture of moisture content in leaves control inlet steam valve and the outlet steam valve in aperture limiting value and leaves moisting tube exit.The utility model is by controlling automatically the moisture in the tobacco leaf leaves moisting process, to promote moisture and control accuracy of temperature in the tobacco leaf leaves moisting process.
In the prior art, owing to generally all arranged the humidification steam jet at the tobacco leaf moisting machine entrance and exit, and these two nozzles are different to the regulating action of moisture content of outlet: the regulating action of outlet nozzle is apparent in view, reaction is very fast, is convenient to control; But from technological angle, the wetting action time of entrance humidification is longer, more be conducive to improve the rate that runs through of tobacco leaf, therefore, in the utility model, to be connected with first predictive PI controller, 1 output with the outlet steam valve with the supporting inlet steam valve of humidification steam jet, for preventing water stain cigarette, rule of thumb set the aperture limiting value of entrance humidification steam valve by operating personnel, the aperture that first predictive PI controller 1 is preferentially regulated the inlet steam valve according to the moisture content in leaves in aperture limiting value and leaves moisting tube exit, when entrance humidification steam valve aperture reaches the limiting value of setting, moisture content of outlet still can not satisfy technological requirement, at this moment, first predictive PI controller 1 will export steam valve and participate in to the moisture control procedure.
The fluctuation of tobacco leaf moisting machine feed rate also is a very important disturbance factor to the influence of tobacco leaf moisting machine moisture content of outlet.Therefore, preferably, be provided with the feed rate signal supervisory instrument that is connected with first predictive PI controller, 1 input in the tobacco leaf moisting machine porch, first predictive PI controller 1 is according to the humidification quantity of steam in feed rate signal and the moisture content of outlet adjusting tobacco leaf moisting machine.
In addition, the rotating speed of tobacco leaf moisting machine directly influences the time of staying of tobacco leaf in tobacco leaf moisting machine, and then causes the variation of tobacco leaf moisting machine moisture content of outlet, and influences the rate that runs through of tobacco leaf.Therefore native system can also be with the tobacco leaf moisting machine rotating speed as one of feed forward variable of moisture control.
When specifically using the utility model, the outlet of leaves moisting tube can detect moisture value, and when this value reaches certain limit, whole leaves moisting moisture control system is the control target with the moisture content of outlet, the pressure that adds moist steam is regulating measure, adopts Model Predictive Control Algorithm to realize closed-loop control in conjunction with Kalman filtering.
Can also control the tobacco leaf temperature in the leaves moisting tube in the utility model, particularly: go back second predictive PI controller 2, store leaves moisting tube tobacco leaf desired temperature in first predictive PI controller 1, store the hot blast temperature setting value in second predictive PI controller 2, the outlet of leaves moisting tube is provided with the first tobacco leaf temperature measuring equipment, be provided with the hot blast temperature measurement mechanism in the heat exchanger 3, the first tobacco leaf temperature measuring equipment is connected with the input of first predictive PI controller 1, the output of first predictive PI controller 1 is connected with the input of hot blast temperature measurement mechanism with second predictive PI controller 2, and the output of second predictive PI controller 2 is connected with heat exchanger 3.The setting of first predictive PI controller 1 and second predictive PI controller 2 is for the tobacco leaf moisting machine outlet temperature is controlled, its with hot blast temperature as regulating measure, utilize predictive PI control algolithm realization closed loop to control automatically, realize indirect control to the leaves moisting temperature with this, the fluctuation range of leaves moisting temperature can be controlled in ± 1.0 ℃ by the utility model, wherein the air circulation in the tobacco leaf moisting machine then can rule of thumb be worth automatic setting.
In the practical application, from the tobacco leaf moisting machine charging, detect signal to the moisture content of outlet device, this process approximately needs the time about 1-2 minute.In this stage, owing to do not feed back detection signal, the moisture control loop is actual to be in open loop control, must need the moisture of removal and the heat of needs according to law of conservation of energy calculating, set up leaves moisting humidification amount and intensification Mathematical Modeling, and then definite humidification steam pressure and barrel desired temperature curve, the accurate control of moisture content of outlet startup stage of realizing tobacco leaf moisting machine.
There is the influence of factors such as non-linear, uncertainty in the real system, in the predictive control algorithm of each controller, based on the prediction output of varying model can not be not in full accord with the actual output of system, and in the rolling optimization process, require model output and real system output to be consistent again, for this reason, Model Predictive Control adopts the error between the actual output of process and the model output to carry out feedback compensation and remedies this defective, and such rolling optimization can overcome the uncertainty in the system effectively.
Claims (3)
1. tobacco leaf tobacco leaf moisting machine, comprise heat exchanger and leaves moisting tube, entrance and exit difference inlet porting steam valve and outlet steam valve at described leaves moisting tube, it is characterized in that, also comprise first predictive PI controller, the inlet steam valve all is connected with the first predictive PI controller output with the outlet steam valve; Leaves moisting tube exit also is provided with the moisture content in leaves checkout gear that is connected with the first predictive PI controller input, also store the aperture limiting value of inlet steam valve and outlet steam valve in first predictive PI controller, first predictive PI controller is according to the aperture of moisture content in leaves control inlet steam valve and the outlet steam valve in aperture limiting value and leaves moisting tube exit.
2. tobacco leaf tobacco leaf moisting machine according to claim 1, it is characterized in that, also comprise second predictive PI controller, store leaves moisting tube tobacco leaf desired temperature in first predictive PI controller, store the hot blast temperature setting value in second predictive PI controller, the outlet of leaves moisting tube is provided with the first tobacco leaf temperature measuring equipment, be provided with the hot blast temperature measurement mechanism in the heat exchanger, the first tobacco leaf temperature measuring equipment is connected with the input of first predictive PI controller, the output of first predictive PI controller is connected with the input of hot blast temperature measurement mechanism with second predictive PI controller, and the output of second predictive PI controller is connected with heat exchanger.
3. tobacco leaf tobacco leaf moisting machine according to claim 1, it is characterized in that, described leaves moisting tube porch also is provided with the feed rate signal supervisory instrument that is connected with the first predictive PI controller input, and first predictive PI controller is according to the humidification quantity of steam in feed rate signal and the moisture content of outlet adjusting tobacco leaf moisting machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220737276 CN203181983U (en) | 2012-12-28 | 2012-12-28 | Tobacco moistening machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220737276 CN203181983U (en) | 2012-12-28 | 2012-12-28 | Tobacco moistening machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203181983U true CN203181983U (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220737276 Expired - Lifetime CN203181983U (en) | 2012-12-28 | 2012-12-28 | Tobacco moistening machine |
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| CN (1) | CN203181983U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105068583A (en) * | 2015-07-07 | 2015-11-18 | 福建中烟工业有限责任公司 | Method and system of controlling water content of material |
| CN107048458A (en) * | 2016-12-14 | 2017-08-18 | 中国航天空气动力技术研究院 | Piece cigarette method for controlling water content based on predictive PI control system |
-
2012
- 2012-12-28 CN CN 201220737276 patent/CN203181983U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105068583A (en) * | 2015-07-07 | 2015-11-18 | 福建中烟工业有限责任公司 | Method and system of controlling water content of material |
| CN105068583B (en) * | 2015-07-07 | 2017-06-23 | 福建中烟工业有限责任公司 | Material water ratio control method and system |
| CN107048458A (en) * | 2016-12-14 | 2017-08-18 | 中国航天空气动力技术研究院 | Piece cigarette method for controlling water content based on predictive PI control system |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130911 |
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| CX01 | Expiry of patent term |