CN115041113A - Temperature control method for mixed oil bath device capable of inhibiting overshoot - Google Patents
Temperature control method for mixed oil bath device capable of inhibiting overshoot Download PDFInfo
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- CN115041113A CN115041113A CN202210682953.5A CN202210682953A CN115041113A CN 115041113 A CN115041113 A CN 115041113A CN 202210682953 A CN202210682953 A CN 202210682953A CN 115041113 A CN115041113 A CN 115041113A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 5
- 230000008859 change Effects 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 15
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 238000013459 approach Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 99
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- JZZIHCLFHIXETF-UHFFFAOYSA-N dimethylsilicon Chemical compound C[Si]C JZZIHCLFHIXETF-UHFFFAOYSA-N 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000011076 safety test Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/0013—Controlling the temperature of the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L7/00—Heating or cooling apparatus; Heat insulating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
- B01J2219/00087—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements outside the reactor
- B01J2219/00094—Jackets
Abstract
The invention discloses a temperature control method for a mixed oil bath device for inhibiting overshoot. The invention specifically comprises the following steps: firstly, when the set target temperature of the mixed oil bath device rises, the proportional valve of the thermal loop is controlled by feedback to open the corresponding opening degree, so that the oil bath temperature quickly approaches the target temperature. And secondly, when the deviation between the oil bath temperature and the target temperature set by the oil bath is small, the hot loop proportional valve is kept opened, the cold loop proportional valve is opened slowly, and overshoot in the temperature rise process is reduced. And finally, when the oil bath temperature tends to be stable, maintaining the feedback control of the hot loop proportional valve and simultaneously gradually reducing the opening of the cold loop proportional valve until the cold loop proportional valve is closed. According to the invention, by adopting a mode that a cold loop is involved in a temperature rise process, the rapid temperature rise and drop characteristic of the mixed oil bath device is ensured, and the overshoot and the fluctuation of the oil bath during rapid temperature change are inhibited.
Description
Technical Field
The invention belongs to the technical field of fine chemical reaction safety test and automated chemistry, and relates to a temperature control method of a mixed oil bath device, which is suitable for the process of greatly increasing and decreasing the temperature of an oil bath and can effectively improve the experimental efficiency and the stability of temperature control.
Background
In the chemical industry, a constant temperature oil bath is a device which is commonly used in the experiment and production processes, and the temperature control performance of the constant temperature oil bath directly influences the experiment efficiency and the quality of products. The common constant-temperature oil bath usually adopts a heating and refrigerating shared oil cavity to realize accurate control of the internal temperature of the oil bath, and the requirement of rapid temperature rise and drop cannot be met. The oil bath has the advantages that the two oil grooves are used as the cold source and the heat source respectively, the control of the internal temperature of the oil bath is realized in a flow control mode through the valve, and the rapid change of the internal temperature of the oil bath is guaranteed under the condition that the cold source and the heat source are enough. The temperature control method of the mixed oil bath device plays a decisive role in the temperature control effect of the mixed oil bath.
The mixed oil bath system is composed as shown in figure 1, the parts related to the invention mainly comprise a monitoring system 1, a high-temperature oil bath 2, a low-temperature oil bath 3, a jacketed metal reaction kettle 4, high-precision proportional valves 5 and 6, electromagnetic valves 7 and 8, high- precision temperature sensors 10, 11 and 12, and the mixed oil bath device also comprises a signal transmission server 9 and a reaction kettle stirring device 13. The mixed oil bath device adopts dimethyl silicon oil as a heat conducting medium, the high-temperature oil bath 2 and the low-temperature oil bath 3 are respectively responsible for providing sufficient heat sources and cold sources, the proportional valves 5 and 6, the electromagnetic valves 7 and 8 are responsible for controlling the flow rate of the mixture of the cold and hot loops, the high- precision sensors 10, 11 and 12 are respectively used for collecting the temperature of an inlet and an outlet of the oil bath and the temperature of a sample in the metal reaction kettle 4 with a jacket, and the collected temperature information is transmitted to the monitoring system 1 through the signal transmission server 9. The heat-conducting medium circulates and flows in the pipeline under the driving action of the pump, the heat is transmitted to the sample in the reaction kettle through the jacket of the metal reaction kettle 4, the monitoring system 1 outputs the opening degree of the valve through detecting the temperature values of different positions in real time and further controls the circulating flow in the cold and hot loop by means of a feedback control algorithm, and the temperature control of the oil bath is realized.
The mixed oil bath device adopts two common oil bath devices to provide sufficient cold sources and heat sources, has obvious advantages in temperature control speed compared with the common oil bath due to the structural advantages, controls the temperature of the heat-conducting medium at the target temperature is the most basic function of the mixed oil bath device, and can stabilize the temperature of the heat-conducting medium at the target temperature by controlling the opening degree of a proportional valve of a hot loop or a cold loop through a PID algorithm in the temperature rising and falling process. However, in the temperature changing process, the hot oil is introduced into the cold oil, the cold oil cannot be mixed with the hot oil rapidly and uniformly, the temperature data measured by the temperature sensor is not the temperature after complete mixing, and the oil bath temperature is often subjected to obvious overshoot when the temperature is greatly increased or decreased. When some samples or loads are subjected to temperature control, the overshoot phenomenon in the temperature increasing and decreasing process may cause the conditions of sample inactivation, load temperature fluctuation and the like, and further cause experiment failure or inaccurate measurement results.
Disclosure of Invention
In order to solve the above situation, the invention provides a temperature control method for a mixed oil bath device for inhibiting overshoot, when the target temperature of the device is changed, the temperature of the oil bath is quickly controlled to be close to the target temperature through feedback control of a first loop proportional valve, after the temperature of the oil bath is close to the target temperature, overshoot of the temperature of the oil bath is inhibited through control of a second loop proportional valve, and after the temperature of the oil bath is stable, the second loop proportional valve is gradually closed, so that the quick and stable control of the target temperature of the oil bath is realized, and the overshoot fluctuation of the temperature of the oil bath is inhibited, specifically:
the method comprises the following steps: when the target temperature of the mixed oil bath is increased or decreased, the proportional valve of the first loop is controlled by feedback to open the corresponding opening degree, so that the oil bath temperature is quickly close to the target temperature;
step two: when the absolute value of the deviation between the oil bath temperature and the target temperature set by the oil bath is smaller than the corresponding threshold value, the feedback control of the proportional valve of the first loop is kept, and the proportional valve of the second loop is opened slowly, so that the overshoot in the temperature control process is reduced.
Step three: when the absolute value of the deviation of the oil bath temperature from the target temperature is less than the threshold value, the opening degree of the proportional valve of the second circuit is kept unchanged.
Step four: when the oil bath temperature tends to be stable, the opening degree of the second loop proportional valve is gradually reduced while the feedback control of the first loop proportional valve is maintained until the second loop proportional valve is closed, and the oil bath temperature is stabilized at the target temperature.
Further, the threshold setting of the absolute value of the deviation between the oil bath temperature and the target temperature in the second step and the third step is specifically as follows: if the difference between the temperature before the oil bath changes the target temperature and the target temperature set by the oil bath is large, the corresponding threshold range is increased, and if the difference is small, the corresponding threshold is reduced.
And further, before the fourth step is started, whether the oil bath temperature tends to be stable or not is judged by detecting the deviation of the oil temperature and the target temperature in real time, the change rate of the oil bath temperature and analyzing the change trend of the oil bath temperature, and if the oil bath temperature is stable, the fourth step is operated.
Further, the change of the opening of the second loop proportional valve in the second step is related to the change rate of the oil bath temperature, when the change rate of the oil bath temperature is high, the change speed of the opening of the second loop proportional valve is also high, and conversely, the change speed of the opening of the second loop proportional valve is also low.
The invention has the beneficial effects that: in the temperature control process of the mixed oil bath device, under the condition that the structure of the mixed oil bath device is not changed, the structural characteristics of the device are fully utilized, the original rapidity of the first loop guarantee device is used, and overshoot and fluctuation in the temperature control process are inhibited by using the mode that the second loop intervenes in the temperature control process.
Drawings
FIG. 1 is a schematic view of the construction of a hybrid oil bath;
1. the system comprises a monitoring system, 2, a high-temperature oil tank, 3, a low-temperature oil tank, 4, a jacketed metal reaction kettle, 5, a hot-loop high-precision proportional valve, 6, a cold-loop high-precision proportional valve, 7, a hot-loop electromagnetic valve, 8, a cold-loop electromagnetic valve, 9, a signal transmission server, 10, an oil bath outlet temperature sensor, 11, an oil bath inlet temperature sensor, 12, a reaction kettle sample temperature sensor, 13 and a stirring motor;
FIG. 2 is a block diagram of a fuzzy PID algorithm system;
FIG. 3 is a schematic diagram showing the original temperature control effect of the mixed oil bath device;
FIG. 4 is a schematic representation of temperature control of a post-mix oil bath apparatus employing the present invention;
fig. 5 is a schematic diagram of proportional valve opening change after the present invention is employed.
Detailed Description
The present invention is described in detail below with reference to the attached drawings and specific embodiments, it should be noted that the present invention can be embodied in many different forms and is not limited to the embodiments described herein, but rather, these embodiments are provided for the purpose of providing a more thorough understanding of the present disclosure.
In order to make the present invention more comprehensible, the present invention is described in detail below with reference to specific examples.
Taking the example of controlling the outlet temperature of the oil bath under the condition that the mixed oil bath device is connected with a jacketed reaction kettle, the temperature of the hot oil bath is set to 250 ℃ before the start of the experiment, the temperature of the cold oil bath is set to-30 ℃, the target temperature of the oil bath is changed from 25 ℃ to 80 ℃ through monitoring software in the experiment process, and the temperature control logic of the mixed oil bath device in the process can be decomposed into the following steps:
the method comprises the following steps: and calculating the optimal control parameter in real time by using a fuzzy control algorithm, calculating the opening degree of the proportional valve in real time by using a PID (proportion integration differentiation) algorithm according to the difference value of the real-time temperature of the oil bath outlet and the target temperature, obtaining the opening degree of the proportional valve of the thermal loop according to the calculation, and simultaneously opening the electromagnetic valve of the thermal loop. The hot oil is mixed with the heat-conducting oil in the jacket of the reaction kettle through a thermal loop, and the temperature of the outlet of the oil bath is quickly close to the target temperature under the circulating action of the pump.
Step two: when the absolute value of the deviation between the oil bath outlet temperature and the target temperature set by the oil bath is less than 15% of the deviation between the oil bath starting temperature and the target temperature, the opening increasing rate of the proportional valve of the cold loop is adjusted in real time according to the change rate of the oil bath outlet temperature while the real-time control of the opening of the proportional valve of the hot loop is maintained.
Step three: when the absolute value of the deviation of the oil bath outlet temperature from the target temperature is less than 3, the proportional valve opening of the cold circuit is kept unchanged. The thermal loop proportional valve can control the oil temperature at the target temperature through small opening change under the control of a fuzzy PID algorithm.
Step four: when the deviation of the oil bath outlet temperature from the target temperature is less than 0.1, the rate of change of the oil bath outlet temperature per second is less than 0.1, and the average deviation of the oil bath outlet temperature from the target temperature in one minute is less than 0.15, the oil bath outlet temperature is considered to tend to be stable. When the temperature of the oil bath outlet is stable, the cold loop slowly closes the proportional valve at a fixed rate. The temperature of the thermal loop proportional valve is gradually increased under the control action of the fuzzy PID algorithm, and the stability of the oil bath outlet temperature is kept.
In the first step of the method, the fuzzy PID algorithm controls the opening of the proportional valve of the thermal loop according to the data collected by the oil bath outlet temperature sensor, the system block diagram is shown in FIG. 2, and the opening V of the proportional valve of the thermal loop heat (t) can be expressed as:
wherein e (t) represents the deviation between the oil bath outlet temperature and the target temperature, K P 、K I 、K D Respectively representing a proportional coefficient, an integral coefficient and a differential coefficient which are obtained by real-time calculation of data acquired by an oil bath temperature sensor in the fuzzy control.
In the second step of the method, when the deviation between the oil bath outlet temperature and the target temperature reaches the set threshold, the opening degree of the cold loop proportional valve is adjusted in real time according to the change rate of the oil bath outlet temperature, and the opening degree V of the cold loop proportional valve cold The expression of (t) is as follows:
wherein V cold (T +1) represents the opening of the proportional valve of the cold circuit for one second, T oil (t)、T oil (t +1) represents the real-time temperature at the outlet of the oil bath and the temperature one second above the outlet of the oil bath, respectively.
The invention fully utilizes the structural advantages of the mixed oil bath device, ensures the rapidity of the temperature-controlling process and reduces the overshoot and the stabilization time by the way that the refrigeration loop participates in the temperature-controlling process. The temperature control schematic diagram of the original mixed oil bath device is shown in FIG. 3, and the temperature control effect is observed to be rapid but has obvious overshoot. After the temperature control method is adopted, the overshoot is obviously reduced, and the stabilization time is faster. The schematic diagrams of the temperature control effect and the valve opening degree transformation are shown in fig. 4 and fig. 5.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, and improvement made within the principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A temperature control method for a mixed oil bath device for inhibiting overshoot is characterized by comprising the following steps:
the method comprises the following steps: when the target temperature of the mixed oil bath is increased or decreased, the proportional valve of the first loop is controlled by feedback to open the corresponding opening degree, so that the oil bath temperature is quickly close to the target temperature;
step two: when the absolute value of the deviation between the oil bath temperature and the target temperature set by the oil bath is smaller than the corresponding first threshold, the feedback control of the proportional valve of the first loop is kept, and the proportional valve of the second loop is opened slowly, so that the overshoot in the temperature control process is reduced;
step three: when the absolute value of the deviation between the oil bath temperature and the target temperature is smaller than a second threshold value, the opening degree of the proportional valve of the second loop is kept unchanged;
step four: when the oil bath temperature tends to be stable, the opening degree of the second loop proportional valve is gradually reduced while the feedback control of the first loop proportional valve is maintained until the second loop proportional valve is closed, and the oil bath temperature is stable at the internal temperature.
2. The method for controlling the temperature of a mixed oil bath for suppressing overshoot according to claim 1, wherein: the threshold setting of the absolute value of the deviation between the oil bath temperature and the target temperature in the second step and the third step is specifically as follows: if the difference between the temperature before the oil bath changes the target temperature and the target temperature set by the oil bath is large, the corresponding threshold range is increased; if the difference is small, the corresponding threshold is decreased.
3. The method for controlling the temperature of a mixed oil bath for suppressing overshoot according to claim 1, wherein: and fourthly, before the fourth step, judging whether the oil bath temperature tends to be stable or not by detecting the deviation of the oil temperature and the target temperature in real time, the change rate of the oil bath temperature and analyzing the change trend of the oil bath temperature, and if the oil bath temperature is stable, operating the fourth step.
4. The method for controlling the temperature of a mixed oil bath for suppressing overshoot according to claim 1, wherein: and in the second step, the change of the opening of the second loop proportional valve is related to the change rate of the oil bath temperature, when the change rate of the oil bath temperature is high, the change speed of the opening of the second loop proportional valve is also high, and otherwise, the change speed of the opening of the second loop proportional valve is also low.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210682953.5A CN115041113A (en) | 2022-06-16 | 2022-06-16 | Temperature control method for mixed oil bath device capable of inhibiting overshoot |
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| CN202210682953.5A CN115041113A (en) | 2022-06-16 | 2022-06-16 | Temperature control method for mixed oil bath device capable of inhibiting overshoot |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103130927A (en) * | 2011-11-29 | 2013-06-05 | 中国石油化工股份有限公司 | Method and system for olefin polymerization temperature control |
| CN106325063A (en) * | 2016-08-30 | 2017-01-11 | 中国科学院理化技术研究所 | Method and device for quickly decreasing temperature |
| CN206424984U (en) * | 2016-12-21 | 2017-08-22 | 科之杰新材料集团有限公司 | A kind of polycarboxylate water-reducer synthesizes constant temperature oil bath device |
| CN208156524U (en) * | 2018-04-26 | 2018-11-27 | 广东新华粤石化集团股份公司 | One is suitable for the accurate temperature control system of multi-user's tank reactor |
| CN109682160A (en) * | 2017-10-19 | 2019-04-26 | 海信（山东）冰箱有限公司 | A kind of temprature control method of wind cooling refrigerator and its alternating temperature compartment |
-
2022
- 2022-06-16 CN CN202210682953.5A patent/CN115041113A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103130927A (en) * | 2011-11-29 | 2013-06-05 | 中国石油化工股份有限公司 | Method and system for olefin polymerization temperature control |
| CN106325063A (en) * | 2016-08-30 | 2017-01-11 | 中国科学院理化技术研究所 | Method and device for quickly decreasing temperature |
| CN206424984U (en) * | 2016-12-21 | 2017-08-22 | 科之杰新材料集团有限公司 | A kind of polycarboxylate water-reducer synthesizes constant temperature oil bath device |
| CN109682160A (en) * | 2017-10-19 | 2019-04-26 | 海信（山东）冰箱有限公司 | A kind of temprature control method of wind cooling refrigerator and its alternating temperature compartment |
| CN208156524U (en) * | 2018-04-26 | 2018-11-27 | 广东新华粤石化集团股份公司 | One is suitable for the accurate temperature control system of multi-user's tank reactor |
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