CN103365318B - A kind of freeze dryer flaggy temperature intelligent control method and system - Google Patents
A kind of freeze dryer flaggy temperature intelligent control method and system Download PDFInfo
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- CN103365318B CN103365318B CN201310293527.3A CN201310293527A CN103365318B CN 103365318 B CN103365318 B CN 103365318B CN 201310293527 A CN201310293527 A CN 201310293527A CN 103365318 B CN103365318 B CN 103365318B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005057 refrigeration Methods 0.000 claims abstract description 12
- 238000004458 analytical method Methods 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims description 8
- 238000007710 freezing Methods 0.000 claims description 6
- 230000008014 freezing Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 abstract 1
- 230000008859 change Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 238000004108 freeze drying Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
Abstract
The invention discloses a kind of freeze dryer flaggy temperature intelligent control method and system, the method comprises the following steps: (1) gathers the temperature of freeze dryer flaggy import, using the difference of the temperature actual value PV that collects and setting value SP as deviate TD; (2) crossing heat R or crossing cold L of temperature is drawn according to deviate TD obtained above; (3) PID arithmetic is carried out to the cold L that crosses obtained above, obtain the output quantity of from heater core; (4) fuzzy rule analysis is carried out to the above-mentioned heat R that obtained, carry out intelligent fuzzy reasoning according to control rule table and show that refrigerating capacity exports number percent OP.This system comprises limit value judge module, refrigeration output fuzzy control model, the well heater pid control module of flaggy temperature, expansion valve pid control module, temperature slope control module and temperature collect module.The present invention has that principle is simple, easy to operate, control accuracy is high, can improve heat utilization rate and reduce the advantages such as operating cost.
Description
Technical field
The present invention is mainly concerned with the control field of freeze dryer, refers in particular to a kind of freeze dryer flaggy temperature intelligent control method and system.
Background technology
Freeze dryer utilizes the principle of distillation to carry out dry a kind of equipment, achieves the quick freezing at low temperatures of dried material, then under suitable vacuum environment, makes the hydrone freezed be directly sublimed into process into water vapor effusion.Need in this process to carry out freezing and heating to dried material, and the temperature of dried material is consistent with the temperature of the carrier (flaggy) placing dried object, therefore needing a set of efficient, stable flaggy temperature control system, this system is usually called as " heart " of freeze dryer.
The temperature control system of conventional freeze dryer flaggy is made up of refrigeration compressor, water condenser, plate type heat exchanger, cooling electronic expansion valve, temperature control electric expansion valve, well heater, oil circulation pump etc., different electric expansion valves is controlled, for dried material provides cold and heat by PLC.The change because of flaggy load is usually there is in current this control system in temperature controlled processes, the factors such as the start and stop of compressor, the hysteresis quality of temperature cause that rate of temperature change responds slowly, temperature fluctuation is large, make dried object occur freezing bad in freeze-drying process, distillation slowly waits the problem and the fault that affect product quality.In addition because temperature fluctuation is large, there is the situation that temperature is too high or too low, need refrigeration compressor or well heater to provide cold or heat at any time like this, make the utilization factor of the heat energy of freeze dryer very low, add energy consumption and operating cost.
Summary of the invention
The technical problem to be solved in the present invention is just: the technical matters existed for prior art, the invention provides that a kind of principle is simple, easy to operate, control accuracy is high, can improve heat utilization rate and reduces energy consumption, the freeze dryer flaggy temperature intelligent control method reducing operating cost and system.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is:
A kind of freeze dryer flaggy temperature intelligent control method, comprises the following steps:
(1) temperature signal of flaggy inflow point in freeze dryer is gathered, using the difference of the temperature actual value PV that collects and desired temperature SP as deviate TD;
(2) crossing heat R or crossing cold L of temperature is drawn according to deviate TD obtained above;
(3) PID arithmetic is carried out to the cold L that crosses obtained above, draw the output quantity of well heater in freeze dryer;
(4) fuzzy rule analysis is carried out to the above-mentioned heat R that obtained, carry out intelligent fuzzy reasoning according to control rule table and show that refrigerating capacity exports number percent OP; The degree of superheat that refrigerating capacity exports respective electronic expansion valve in number percent OP and freeze dryer exports the aperture of number percent OPO co-controlling electric expansion valve, and both selecting in smaller value as the control output number percent of electric expansion valve.
Improve further as method of the present invention:
The forming process of described control rule table is:
(1.1) draw flaggy control temperature CT according to rate of temperature change, flaggy control temperature CT equals desired temperature SP; And then calculation deviation value TD:TD=| flaggy inlet temperature-CT|;
(1.2) with CT be table row, TD be table row, the point of crossing of table correspond to OP, sets up corresponding relation.
By the size obfuscation of CT, TD in control rule table, fundamental domain is decided to be 7 kinds of ranks: in negative large, negative, negative little, zero, just little, center, honest.
The present invention further discloses a kind of freeze dryer flaggy Temperature Intelligent Control System, comprise the limit value judge module of flaggy temperature, refrigeration exports fuzzy control model, well heater pid control module, expansion valve pid control module, temperature slope control module and temperature collect module; Described temperature collect module is used for gathering the temperature of flaggy in freeze dryer, and the limit value judge module of described flaggy temperature drew heat R according to the temperature of flaggy or crossed the judgement of cold L; When flaggy temperature is on the low side, described temperature slope control module, well heater pid control module carry out PID arithmetic to crossing cold L, control to add thermal output; When flaggy temperature drift, described temperature slope control module, refrigeration export fuzzy control model to crossing after heat R carries out fuzzy rule analyzing and processing, carry out through described expansion valve pid control module the control exported of freezing.
Further improvement as control system of the present invention:
The temperature of described temperature collect module to flaggy inflow point gathers.
Compared with prior art, the invention has the advantages that:
The present invention adopts fuzzy refrigeration control, and accuracy is high, and the flaggy temperature fluctuation in control procedure is minimum, flaggy temperature can be controlled fluctuate up and down in setting value to be no more than 0.8 degree Celsius, thus improves the utilization factor of heat energy, improves the qualification rate of product; Automaticity of the present invention is high, adopting the Automatic Control of intelligence, without the need to artificially adjusting respective electronic expansion valve, can save labour.Present invention achieves the accurate control of the refrigeration of freeze dryer flaggy, heating and flaggy rate temperature change, solve that the freeze-drying occurred in freeze-drying process is bad, distil the problem such as slow, improve the utilization factor of heat energy simultaneously, reduce the operating cost of energy consumption and freeze dryer.
Accompanying drawing explanation
Fig. 1 is Control system architecture figure of the present invention.
Fig. 2 is the frame principles schematic diagram of control system of the present invention.
Embodiment
Below in conjunction with Figure of description and specific embodiment, the invention will be further described.
A kind of freeze dryer flaggy temperature intelligent control method of the present invention, comprises the following steps:
(1) temperature signal of flaggy inflow point in freeze dryer is gathered, using the difference of the temperature actual value PV that collects and desired temperature SP as deviate TD;
(2) crossing heat R or crossing cold L of temperature is drawn according to deviate TD obtained above;
(3) PID arithmetic is carried out to the cold L that crosses obtained above, draw the output quantity of well heater in freeze dryer;
(4) fuzzy rule analysis is carried out to the above-mentioned heat R that obtained, carry out intelligent fuzzy reasoning according to control rule table and show that refrigerating capacity exports number percent OP; The degree of superheat that refrigerating capacity exports respective electronic expansion valve in number percent OP and freeze dryer exports the aperture of number percent OPO co-controlling electric expansion valve, and both selecting in smaller value as the control output number percent of electric expansion valve.
The forming process of above-mentioned control rule table is:
(1.1) draw flaggy control temperature CT according to rate of temperature change, flaggy control temperature CT equals desired temperature SP; And then calculation deviation value TD:TD=| flaggy inlet temperature-CT|;
(1.2) with CT be table row, TD be table row, the point of crossing of table correspond to OP, sets up corresponding relation;
(1.3) by the size obfuscation of CT, TD, fundamental domain is decided to be 7 kinds of ranks: in negative large, negative, negative little, zero, just little, center, honest; Be appreciated that in other examples, also according to working control needs, fundamental domain can be defined as the rank of other quantity.
As depicted in figs. 1 and 2, the present invention further provides a kind of freeze dryer flaggy Temperature Intelligent Control System, comprise the limit value judge module of flaggy temperature, refrigeration exports fuzzy control model, well heater pid control module, expansion valve pid control module, temperature slope control module and temperature collect module; Temperature collect module is used for gathering the temperature of flaggy in freeze dryer, and the limit value judge module of flaggy temperature drew heat R according to the temperature of flaggy or crossed the judgement of cold L; When flaggy temperature is on the low side, temperature slope control module, well heater pid control module carry out PID arithmetic to crossing cold L, control to add thermal output; When flaggy temperature drift, temperature slope control module, refrigeration export fuzzy control model to crossing after heat R carries out fuzzy rule analyzing and processing, carry out through expansion valve pid control module the control exported of freezing.
Flaggy temperature control is the design temperature inlet temperature of flaggy being controlled specifying, flaggy inflow point be flaggy is carried out the most rapidly, best place that most accurate temperature controls.In the present embodiment, in the temperature-measuring casing of flaggy inflow point, there is a RTD temperature measuring unit, as temperature collect module, inlet temperature is measured.Temperature collect module enters PLC after temperature transmitter, and is used in temperature control logic.To following measures be taked when temperature limit judge module determination flaggy is crossed cold or overheated:
When flaggy is overheated, control system is by the fuzzy control of startup refrigeration:
First require to draw current flaggy control temperature CT according to rate of temperature change.
Then calculating temperature difference: TD=| flaggy inlet temperature-CT|.
According to the above parameter calculating gained, by the variable size obfuscation of the control temperature CT of flaggy and temperature difference TD, fundamental domain is decided to be following 7 kinds of ranks: negative large, negative in, negative little, zero, just little, center, honest.Simultaneously according to the situation that reality exports, create following control rule table:
In the table of comparisons, refrigerating capacity output number percent OP and current flaggy control temperature CT is stored in relation table.Current flaggy control temperature CT is the row of table, and temperature difference TD is the row of table simultaneously, and the corresponding refrigerating capacity in point of crossing of table exports number percent OP, sets up corresponding relation as following table:
Show that refrigerating capacity exports number percent OP value according to the number of units of existing compressor and upper table, the actuation time of each flaggy cooling valve will obtain exporting confirmation by fuzzy reasoning.For electric expansion valve, the degree of superheat of refrigerating capacity output number percent OP and respective electronic expansion valve exports the aperture of number percent OPO co-controlling electric expansion valve, and the control that the smaller value in selecting both is electric expansion valve exports number percent.
When the quantity of compressor is 2, it is as follows that fuzzy reasoning obtains principle:
When flaggy is crossed cold, control system will draw the control temperature of current flaggy according to rate of temperature change, then carries out PID arithmetic, exports the controling parameters of heating.
Below be only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be considered as protection scope of the present invention.
Claims (5)
1. a freeze dryer flaggy temperature intelligent control method, is characterized in that, comprise the following steps:
(1) gather the temperature signal of flaggy inflow point in freeze dryer, obtain the difference of temperature actual value PV and desired temperature SP;
(2) crossing heat R or crossing cold L of temperature is drawn according to difference obtained above;
(3) PID arithmetic is carried out to the cold L that crosses obtained above, draw the output quantity of well heater in freeze dryer; Or fuzzy rule analysis is carried out to the above-mentioned heat R that obtained, formulates control rule table, and carry out intelligent fuzzy reasoning according to control rule table and show that refrigerating capacity exports number percent OP; The degree of superheat that refrigerating capacity exports respective electronic expansion valve in number percent OP and freeze dryer exports the aperture of number percent OPO co-controlling electric expansion valve, and both selecting in smaller value as the control output number percent of electric expansion valve.
2. freeze dryer flaggy temperature intelligent control method according to claim 1, it is characterized in that, the forming process of described control rule table is:
(1.1) calculation deviation value TD:TD=| flaggy inlet temperature-CT|, wherein CT represents flaggy control temperature, and desired temperature SP equals flaggy control temperature CT;
(1.2) with CT be table row, TD be table row, the point of crossing of table correspond to OP, sets up corresponding relation.
3. freeze dryer flaggy temperature intelligent control method according to claim 2, is characterized in that, by the size obfuscation of CT, TD in control rule table, fundamental domain is decided to be 7 kinds of ranks: in negative large, negative, negative little, zero, just little, center, honest.
4. a freeze dryer flaggy Temperature Intelligent Control System, it is characterized in that, comprise the limit value judge module of flaggy temperature, refrigeration exports fuzzy control model, well heater pid control module, expansion valve pid control module, temperature slope control module and temperature collect module; Described temperature collect module is used for gathering the temperature of flaggy in freeze dryer, and the limit value judge module of described flaggy temperature drew heat R according to the temperature of flaggy or crossed the judgement of cold L; When flaggy temperature is lower than desired temperature, described temperature slope control module, well heater pid control module carry out PID arithmetic to crossing cold L, control to add thermal output; When flaggy temperature is higher than desired temperature, described temperature slope control module, refrigeration export fuzzy control model to crossing after heat R carries out fuzzy rule analyzing and processing, formulate corresponding control rule table and output number percent to the described expansion valve pid control module exporting refrigerating capacity according to control rule table carries out the control exported of freezing.
5. freeze dryer flaggy Temperature Intelligent Control System according to claim 4, is characterized in that: the temperature of described temperature collect module to flaggy inflow point gathers.
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| CN105425854B (en) * | 2015-12-20 | 2017-05-31 | 湖南科技大学 | A kind of bridge cable heats anti-icing control method |
| CN105595149A (en) * | 2015-12-21 | 2016-05-25 | 江苏新美星包装机械股份有限公司 | Method for controlling sterilization temperature of sterilization machine |
| CN109991843B (en) * | 2019-04-30 | 2021-11-23 | 广州齐志生物工程设备有限公司 | Temperature control method of bioreactor |
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| US5398426A (en) * | 1993-12-29 | 1995-03-21 | Societe' De Gestion Et De Diffusion North America, Inc. | Process and apparatus for desiccation |
| CN201314766Y (en) * | 2008-12-11 | 2009-09-23 | 上海舒博拉尼制药设备有限公司 | Refrigeration controller for freezedryer |
| CN101858689A (en) * | 2010-06-11 | 2010-10-13 | 上海东富龙科技股份有限公司 | Energy-saving freeze dryer and control method thereof |
| CN201744282U (en) * | 2010-05-25 | 2011-02-16 | 陈蓉 | Freezing type drying machine capable of controlling temperature of refrigerant |
| CN201876094U (en) * | 2010-12-01 | 2011-06-22 | 河南辅仁怀庆堂制药有限公司 | Temperature control device on freeze drier |
| CN103123206A (en) * | 2013-03-21 | 2013-05-29 | 楚天科技股份有限公司 | Freeze dryer |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5398426A (en) * | 1993-12-29 | 1995-03-21 | Societe' De Gestion Et De Diffusion North America, Inc. | Process and apparatus for desiccation |
| CN201314766Y (en) * | 2008-12-11 | 2009-09-23 | 上海舒博拉尼制药设备有限公司 | Refrigeration controller for freezedryer |
| CN201744282U (en) * | 2010-05-25 | 2011-02-16 | 陈蓉 | Freezing type drying machine capable of controlling temperature of refrigerant |
| CN101858689A (en) * | 2010-06-11 | 2010-10-13 | 上海东富龙科技股份有限公司 | Energy-saving freeze dryer and control method thereof |
| CN201876094U (en) * | 2010-12-01 | 2011-06-22 | 河南辅仁怀庆堂制药有限公司 | Temperature control device on freeze drier |
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Application publication date: 20131023 Assignee: Changsha Pharmaceutical Equipment Industrial Technology Research Institute Co.,Ltd. Assignor: TRUKING TECHNOLOGY Ltd. Contract record no.: X2023980051833 Denomination of invention: A Method and System for Intelligent Control of Layer Temperature of Freeze Drying Machine Granted publication date: 20160224 License type: Common License Record date: 20231213 |