CN103365318A - Freeze drying equipment ply temperature intelligent control method and freeze drying equipment ply temperature intelligent control system - Google Patents
Freeze drying equipment ply temperature intelligent control method and freeze drying equipment ply temperature intelligent control system Download PDFInfo
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- CN103365318A CN103365318A CN2013102935273A CN201310293527A CN103365318A CN 103365318 A CN103365318 A CN 103365318A CN 2013102935273 A CN2013102935273 A CN 2013102935273A CN 201310293527 A CN201310293527 A CN 201310293527A CN 103365318 A CN103365318 A CN 103365318A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004108 freeze drying Methods 0.000 title abstract description 11
- 238000005057 refrigeration Methods 0.000 claims abstract description 13
- 238000004458 analytical method Methods 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000004781 supercooling Methods 0.000 abstract 2
- 239000000463 material Substances 0.000 description 4
- 238000004821 distillation Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 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
- 238000001816 cooling 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
- 230000004044 response Effects 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
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Abstract
The invention discloses a freeze drying equipment ply temperature intelligent control method and a freeze drying equipment ply temperature intelligent control system. The method includes the following steps that firstly, the temperature of an entrance of a freeze drying equipment ply is collected, and the difference value of the collected temperature actual value PV and the set value SP is used as the deviation value TD; secondly, the superheated heat quantity R or the supercooling quantity L of the temperature are obtained according to the obtained deviation value TD; thirdly, the PID operation is performed on the obtained supercooling quantity L, and the output quantity of a heater is obtained; fourthly, the fuzzy rule analysis is performed on the obtained superheated heat quantity R, and the intelligent fuzzy reasoning can be carried out according to a control rule table so as to obtain the refrigerating capacity output percentage OP. The freeze drying equipment ply temperature intelligent control system comprises a ply temperature limiting value judging module, a refrigeration output fuzzy control module, a heater PID control module, an expansion valve PID control module, a temperature slope control module and a temperature collecting module. The freeze drying equipment ply temperature intelligent control method and the freeze drying equipment ply temperature intelligent control system have the advantages of being simple in principle, convenient to operate, high in control precision, capable of improving the heat energy utilization rate and reducing operation cost and the like.
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 is to utilize the principle of distillation to carry out dry a kind of equipment, has realized the at low temperatures quick freezing of material that is dried then under suitable vacuum environment, making the hydrone that freezes be directly sublimed into the process of overflowing into water vapor.In this process, need to carry out freezing and heating to the material that is dried, and the temperature of the material that is dried is consistent with the be dried temperature of carrier (flaggy) of thing of placement, so need efficient, the stable flaggy temperature control system of a cover, this system usually is called as " heart " of freeze dryer.
The temperature control system of conventional freeze dryer flaggy is made of institutes such as refrigeration compressor, water condenser, plate type heat exchanger, refrigeration electric expansion valve, temperature control electric expansion valve, well heater, silicone oil ebullators, by the different electric expansion valve of PLC control, for the material that is dried provides cold and heat.Variation because of the flaggy load usually appears in present this control system in temperature controlled processes, the start and stop of compressor, the factors such as hysteresis quality of temperature cause rate of temperature change response slowly, temperature fluctuation is large, thing occurs freezing bad in freeze-drying process so that be dried, and distillation slowly waits problem and the fault that affects product quality.Because temperature fluctuation is large, there are excess Temperature or excessively low situation in addition, need like this refrigeration compressor or well heater that cold or heat are provided at any time, make the utilization factor of heat energy of freeze dryer very low, increased energy consumption and operating cost.
Summary of the invention
The technical problem to be solved in the present invention just is: the freeze dryer flaggy temperature intelligent control method and the system that for the technical matters that prior art exists, the invention provides that a kind of principle is simple, easy to operate, control accuracy is high, can improve heat utilization rate and reduce energy consumption, reduce operating cost.
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 may further comprise the steps:
(1) gather the temperature signal of flaggy inflow point in the freeze dryer, with the difference of the temperature actual value PV that collects and desired temperature SP as deviate TD;
(2) draw crossing heat R or crossing cold L of temperature according to deviate TD obtained above;
(3) the cold L that crosses obtained above is carried out the PID computing, draw the output quantity of well heater in the freeze dryer;
(4) the above-mentioned heat R that obtained is carried out the fuzzy rule analysis, carry out the intelligent fuzzy reasoning according to control rule table and draw refrigerating capacity output number percent OP; The aperture of the degree of superheat output number percent OPO co-controlling electric expansion valve of respective electronic expansion valve in refrigerating capacity output number percent OP and the freeze dryer, and select the smaller value among both to export number percent as the control of electric expansion valve.
Further improve 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) row take CT as table, the row of TD as showing, the point of crossing correspondence of table OP, sets up corresponding relation.
In control rule table, with the big or small 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.
The present invention further discloses a kind of freeze dryer flaggy Temperature Intelligent Control System, the limit value judge module, refrigeration output fuzzy control model, the well heater pid control module that comprise the flaggy temperature, 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 the freeze dryer, and the limit value judge module of described flaggy temperature drew heat R or the excessively judgement of cold L according to the temperature of flaggy; When the flaggy temperature was on the low side, described temperature slope control module, well heater pid control module carried out the PID computing to crossing cold L, and control adds thermal output; When the flaggy temperature drift, described temperature slope control module, refrigeration output fuzzy control model be to after crossing heat R and carrying out the fuzzy rule analyzing and processing, through the freeze control of output of described expansion valve pid control module.
Further improvement as control system of the present invention:
Described temperature collect module gathers the temperature of flaggy inflow point.
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, the flaggy temperature can be controlled at setting value and fluctuate up and down and be no more than 0.8 degree centigrade, thereby improve the utilization factor of heat energy, improves the qualification rate of product; Automaticity of the present invention is high, adopts the Automatic Control of intelligence, need not artificially to adjust the respective electronic expansion valve, can save the labour.The present invention has realized the accurate control of refrigeration, heating and the flaggy rate temperature change of freeze dryer flaggy, the problems such as the freeze-drying that occurs is bad, distillation is slow have been solved in freeze-drying process, improve simultaneously the utilization factor of heat energy, reduced the operating cost of energy consumption and freeze dryer.
Description of drawings
Fig. 1 is control system structural drawing of the present invention.
Fig. 2 is the frame principles synoptic diagram of control system of the present invention.
Embodiment
The invention will be further described below in conjunction with Figure of description and specific embodiment.
A kind of freeze dryer flaggy temperature intelligent control method of the present invention may further comprise the steps:
(1) gather the temperature signal of flaggy inflow point in the freeze dryer, with the difference of the temperature actual value PV that collects and desired temperature SP as deviate TD;
(2) draw crossing heat R or crossing cold L of temperature according to deviate TD obtained above;
(3) the cold L that crosses obtained above is carried out the PID computing, draw the output quantity of well heater in the freeze dryer;
(4) the above-mentioned heat R that obtained is carried out the fuzzy rule analysis, carry out the intelligent fuzzy reasoning according to control rule table and draw refrigerating capacity output number percent OP; The aperture of the degree of superheat output number percent OPO co-controlling electric expansion valve of respective electronic expansion valve in refrigerating capacity output number percent OP and the freeze dryer, and select the smaller value among both to export number percent as the control 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) row take CT as table, the row of TD as showing, the point of crossing correspondence of table OP, sets up corresponding relation;
(1.3) with the big or small 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 embodiment, also can according to the working control needs, fundamental domain 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 limit value judge module, refrigeration output fuzzy control model, well heater pid control module, expansion valve pid control module, temperature slope control module and the temperature collect module of flaggy temperature; Temperature collect module is used for gathering the temperature of flaggy in the freeze dryer, and the limit value judge module of flaggy temperature drew heat R or the excessively judgement of cold L according to the temperature of flaggy; When the flaggy temperature was on the low side, temperature slope control module, well heater pid control module carried out the PID computing to crossing cold L, and control adds thermal output; When the flaggy temperature drift, temperature slope control module, refrigeration output fuzzy control model be to after crossing heat R and carrying out the fuzzy rule analyzing and processing, through the freeze control of output of expansion valve pid control module.
The flaggy temperature control is the design temperature that the inlet temperature of flaggy is controlled at appointment, and flaggy inflow point carries out the rapidest, the most accurate temperature controlled best place to flaggy.In the present embodiment, a RTD temperature measuring unit is arranged in the temperature-measuring casing of flaggy inflow point, as temperature collect module inlet temperature is measured.Temperature collect module enters PLC through behind the temperature transmitter, and is used in temperature control logic.Determine when the temperature limit judge module that flaggy is crossed and will take following measures when cold or overheated:
When flaggy is overheated, control system will start the refrigeration fuzzy control:
At first require to draw current flaggy control temperature CT according to rate of temperature change.
Follow calculating temperature difference: TD=| flaggy inlet temperature-CT|.
According to the parameter of above calculating gained, the variable size obfuscation with the control temperature CT of flaggy and temperature difference TD is decided to be following 7 kinds of ranks with fundamental domain: negative large, negative in, negative little, zero, just little, center, honest.According to the situation of reality output, create following control rule table simultaneously:
Refrigerating capacity output number percent OP and current flaggy control temperature CT are stored in the relation table in the table of comparisons.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 output in the point of crossing of table number percent OP sets up corresponding relation such as following table:
Number of units and upper table according to existing compressor draw refrigerating capacity output number percent OP value, will obtain output by fuzzy reasoning the actuation time of each flaggy cooling valve and confirm.For electric expansion valve, the aperture of refrigerating capacity output number percent OP and the degree of superheat output number percent OPO co-controlling electric expansion valve of respective electronic expansion valve, and to select smaller value among both be that number percent is exported in the control of electric expansion valve.
When the quantity of compressor was 2, it is as follows that fuzzy reasoning gets principle:
Cross when cold when flaggy, control system will draw according to rate of temperature change the control temperature of current flaggy, carry out the PID computing again, the control parameter of output heating.
Below only be preferred implementation of the present invention, protection scope of the present invention also not only is confined to above-described embodiment, and all technical schemes that belongs under the thinking of the present invention all belong to protection scope of the present invention.Should be pointed out that for those skilled in the art the some improvements and modifications not breaking away under the principle of the invention prerequisite 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, may further comprise the steps:
(1) gather the temperature signal of flaggy inflow point in the freeze dryer, with the difference of the temperature actual value PV that collects and desired temperature SP as deviate TD;
(2) draw crossing heat R or crossing cold L of temperature according to deviate TD obtained above;
(3) the cold L that crosses obtained above is carried out the PID computing, draw the output quantity of well heater in the freeze dryer;
(4) the above-mentioned heat R that obtained is carried out the fuzzy rule analysis, carry out the intelligent fuzzy reasoning according to control rule table and draw refrigerating capacity output number percent OP; The aperture of the degree of superheat output number percent OPO co-controlling electric expansion valve of respective electronic expansion valve in refrigerating capacity output number percent OP and the freeze dryer, and select the smaller value among both to export number percent as the control of electric expansion valve.
2. freeze dryer flaggy temperature intelligent control method according to claim 1 is characterized in that 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) row take CT as table, the row of TD as showing, the point of crossing correspondence of table OP, sets up corresponding relation.
3. freeze dryer flaggy temperature intelligent control method according to claim 2 is characterized in that, with the big or small obfuscation of CT, TD, fundamental domain is decided to be 7 kinds of ranks in control rule table: in negative large, negative, negative little, zero, just little, center, honest.
4. freeze dryer flaggy Temperature Intelligent Control System, it is characterized in that, the limit value judge module, refrigeration output fuzzy control model, the well heater pid control module that comprise the flaggy temperature, 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 the freeze dryer, and the limit value judge module of described flaggy temperature drew heat R or the excessively judgement of cold L according to the temperature of flaggy; When the flaggy temperature was on the low side, described temperature slope control module, well heater pid control module carried out the PID computing to crossing cold L, and control adds thermal output; When the flaggy temperature drift, described temperature slope control module, refrigeration output fuzzy control model be to after crossing heat R and carrying out the fuzzy rule analyzing and processing, through the freeze control of output of described expansion valve pid control module.
5. freeze dryer flaggy Temperature Intelligent Control System according to claim 4, it is characterized in that: described temperature collect module gathers the temperature of flaggy inflow point.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425854A (en) * | 2015-12-20 | 2016-03-23 | 湖南科技大学 | Anti-ice heating control method of bridge cable |
| 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 |
| CN109991843A (en) * | 2019-04-30 | 2019-07-09 | 广州齐志生物工程设备有限公司 | A kind of temprature control method of bioreactor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105425854A (en) * | 2015-12-20 | 2016-03-23 | 湖南科技大学 | Anti-ice heating control method of bridge cable |
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| CN109991843A (en) * | 2019-04-30 | 2019-07-09 | 广州齐志生物工程设备有限公司 | A kind of temprature control method of bioreactor |
| 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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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 |