CN220143343U - Cooling and temperature control system of degradable polyester experimental device heating medium system - Google Patents
Cooling and temperature control system of degradable polyester experimental device heating medium system Download PDFInfo
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- CN220143343U CN220143343U CN202321298482.4U CN202321298482U CN220143343U CN 220143343 U CN220143343 U CN 220143343U CN 202321298482 U CN202321298482 U CN 202321298482U CN 220143343 U CN220143343 U CN 220143343U
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 89
- 229920000728 polyester Polymers 0.000 title claims abstract description 62
- 238000001816 cooling Methods 0.000 title claims abstract description 45
- 239000002826 coolant Substances 0.000 claims abstract description 60
- 238000006243 chemical reaction Methods 0.000 claims abstract description 59
- 230000001105 regulatory effect Effects 0.000 claims abstract description 42
- 238000003860 storage Methods 0.000 claims abstract description 4
- 239000003507 refrigerant Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 28
- 238000002474 experimental method Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 7
- 238000003786 synthesis reaction Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 238000006068 polycondensation reaction Methods 0.000 description 4
- 206010017472 Fumbling Diseases 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005886 esterification reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011020 pilot scale process Methods 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Devices For Use In Laboratory Experiments (AREA)
Abstract
The utility model relates to a cooling and temperature control system of a heating medium system of a degradable polyester experimental device, which comprises a closed loop system formed by a heating medium cooler, a cooling medium outlet automatic regulating valve, a cooling medium storage tank, a cooling medium circulating pump, a temperature-regulating refrigerator and a cooling medium inlet automatic regulating valve which are connected with each other by pipelines clockwise, and also comprises an automatic control system which is connected with a heating medium inlet and outlet automatic regulating valve, a cooling medium inlet and outlet automatic regulating valve and a temperature-regulating refrigerator by signal wires. The utility model solves the problems of no forced cooling, unsatisfactory heat exchange effect, inaccurate reaction temperature control, low experimental efficiency and the like of the heat medium system of the conventional degradable polyester experimental device, and has the advantages of small device investment, simple structure and high degree of automation.
Description
Technical Field
The utility model relates to the technical field of temperature control of a heating medium of a degradable polyester experimental device, in particular to cooling and temperature control of a heating medium system of the degradable polyester experimental device.
Background
In the polyester synthesis process, many process formulation fumbling is accomplished by polyester experimental setup. The experimental device of the polyester is particularly suitable for development and test of new polyester varieties due to the characteristics of small investment, short construction period, strong production adaptability, easy conversion of product varieties and the like. Most of the development of novel polyesters in the market is to firstly test by a polyester experimental device, confirm the formula and the production process, and then amplify the polyester, so as to further realize industrialized popularization.
The synthesis of the degradable polyester material generally comprises two processes of esterification and polycondensation, wherein the esterification reaction is carried out at 110-240 ℃ for 2-4 hours; the polycondensation reaction is carried out at 180-300 ℃ for 4-12 hours, and the target product of the experiment can be obtained only by realizing accurate and stable control of the reaction temperature of the materials in each reaction stage.
The control of the synthesis reaction temperature of the degradable polyester material is realized mainly by heat exchange between the reaction kettle and a heating medium system. At present, the common heating medium system of the degradable polyester experimental device in China adopts a heating medium furnace to heat the heating medium, and natural heat dissipation is adopted for cooling.
When fumbling research and development experiments of new formulas, new products and the like for synthesizing the degradable polyester are carried out, frequent heating and cooling treatment is needed in the reaction process, the speed of the cooling process is completely dependent on the influence of environmental factors, and the cooling effect is not ideal. Especially, a great deal of heat release that reaction process appears unusual makes reaction material temperature rise sharply, when surpassing the reaction and presuming that the temperature range is great, current experimental apparatus heat medium cooling only relies on natural heat dissipation, and the cooling is slow, hardly returns the setting range with reation kettle material temperature control in the short time, easily leads to the material to be oxidized, and the side reaction increases, can't obtain the target product, increases the experiment failure risk.
Patent CN202829905U discloses a system for adjusting the kettle temperature of a reaction kettle for producing polyester resin, which adopts a heating device and a cooling device to heat and cool a heat-conducting fluid, thereby realizing the heating and cooling of the reaction kettle, and controlling the flow rate of the heat-conducting fluid to adjust the temperature through the opening of a valve. However, the reaction kettle requires that the outer peripheral wall is provided with a half-branch pipe which is spirally arranged, the inner part of the reaction kettle is provided with a full pipe which is spirally arranged, and the half-branch pipe and the full pipe are alternately stacked, so that the heat exchange requirement of heat conduction fluid on rapid heating and cooling of reaction materials can be met. But the volume of the reaction kettle of the small-scale experimental device for the degradable polyester material is generally smaller than 50L, the volume of the pilot scale reaction kettle is 50-100L, the volume is small, the complex structural design cannot be realized inside and outside the reaction kettle, the heat exchange area is small, the heat exchange capability is insufficient, and the requirements of rapid heating and cooling experiments cannot be met.
And the synthetic reaction period of the degradable polyester material is longer, generally 6 ～ And 16 hours. If continuous experiments are carried out, the high-temperature heating medium at about 300 ℃ of the previous reaction is required to be cooled to below 50 ℃ so that the second synthesis experiment can be carried out again. The existing degradable polyester experimental device is naturally cooled by the environment, so that the cooling of the heating medium can be completed usually in a long time, the experimental frequency is seriously influenced, the utilization rate of the device is low, and the research and development process is slow; on the other hand, the experimental device is at a higher temperature for a long time, and is easy to form thermal stress concentration, so that the service life of the experimental device is influenced.
In summary, the existing degradable polyester experimental device has the following problems:
1. the heating medium system is not provided with a forced cooling device, the cooling is slow, the rapid and accurate control of the material temperature is difficult to realize, particularly when the reaction is abnormal, a large amount of reaction heat cannot be removed in time, a target product is difficult to obtain, and potential safety hazards exist.
2. The experimental device is small in size, the reaction kettle is simple in structure, complex structural design cannot be realized inside and outside, the heat exchange surface is insufficient, and the heat exchange effect is not ideal.
3. The heating medium system adopts a natural cooling mode, the cooling time is long, and the continuous experimental efficiency and the equipment service life are affected.
Disclosure of Invention
The utility model aims to overcome the defects of no forced cooling, unsatisfactory heat exchange effect and low experimental efficiency of the heat medium system of the conventional degradable polyester experimental device, and further provides a cooling and temperature control system of the heat medium system of the degradable polyester experimental device, which has the advantages of small investment, simple structure and high degree of automation.
In the synthesis experiment of the degradable polyester material, the key of experimental success and high efficiency depends on the following aspects: firstly, the temperature fluctuation of materials is controlled within +/-2 ℃ for a long time during the reaction of polyester; secondly, in fumbling research of new experimental formulas, new products and the like, the reaction temperature of a polyester synthesis system is affected due to different chemical characteristics of reactants and different types and amounts of catalysts, reaction abnormality often occurs, the temperature is rapidly increased, rapid cooling is needed at the moment, otherwise, high-temperature oxidation of materials is caused, and the experiment fails; thirdly, after an experiment is completed, when the next experiment is carried out, the temperature of the reaction kettle needs to be reduced to below 50 ℃, the existing natural heat dissipation mode is too low in heat dissipation efficiency, usually 6 hours are needed, the experiment progress is seriously influenced, the device is adversely influenced by long-time high temperature, and the service life of the device is shortened.
In order to solve the technical problems, the cooling and temperature control system of the heating medium system of the degradable polyester experimental device comprises a closed loop system formed by a heating medium cooler, a cooling medium outlet automatic regulating valve, a cooling medium storage tank, a cooling medium circulating pump, a temperature-regulating refrigerator and a cooling medium inlet automatic regulating valve which are connected with each other by pipelines clockwise, and also comprises an automatic control system which is connected with the heating medium inlet and outlet automatic regulating valves through signal wires, wherein the cooling medium inlet and outlet automatic regulating valves are connected with the temperature-regulating refrigerator. The closed loop system design can realize forced cooling of the heat medium of the degradable polyester experimental device, the temperature-adjusting refrigerator is favorable for quickly adjusting the temperature of the cooling medium, the closed loop system design is suitable for cooling under various experimental abnormal conditions, the automatic control system reduces human operation errors, shortens operation time and is favorable for accurately controlling the reaction temperature of materials.
The cooling and temperature control system of the heating medium system of the degradable polyester experimental device comprises a heating medium cooler, a heating medium inlet automatic regulating valve, a heating medium inlet temperature transmitter, a heating medium outlet automatic regulating valve, a heating medium outlet temperature transmitter, a cooling medium inlet and a cooling medium inlet automatic regulating valve and a cooling medium inlet temperature transmitter, wherein the heating medium cooler is connected with a polyester reaction kettle through a pipeline, the bottom of the heating medium cooler is provided with a heating medium inlet, the heating medium inlet automatic regulating valve and the heating medium inlet temperature transmitter are arranged on the heating medium cooler, the top of the heating medium cooler is provided with a heating medium outlet automatic regulating valve and the cooling medium outlet temperature transmitter, and the left lower part of the heating medium cooler is provided with a cooling medium inlet. The heat medium inlet and outlet temperature transmitters and the cooling medium inlet and outlet temperature transmitters are connected with an automatic control system, so that the connection among the material reaction temperature, the heat medium temperature and the cooling medium temperature is facilitated to be established, and the automatic control of the automatic control system on the heat medium inlet and outlet automatic regulating valves and the cooling medium inlet and outlet automatic regulating valves is realized through signal feedback of a plurality of temperature transmitters of the system.
The cooling and temperature control system of the heat medium system of the degradable polyester experimental device is characterized in that the heat medium cooler is a tube array heat exchanger or a plate heat exchanger. The two are simple in structure and high in heat exchange efficiency, and timely heat exchange in the experimental process is facilitated.
The cooling and temperature control system of the heat medium system of the degradable polyester experimental device comprises a cooling medium, a cooling medium and a cooling medium control system, wherein the cooling medium of the cooling medium system of the heat medium system of the degradable polyester experimental device is mechanical oil. The mechanical oil has the advantages of quick heat conduction and high heat transfer efficiency, and is favorable for quick heat exchange between the reaction process and the heating medium.
The cooling and temperature control system of the heat medium system of the degradable polyester experimental device is characterized in that the temperature-adjusting refrigerator adopts Freon as a refrigerant. The Freon refrigerant has wide application range, is environment-friendly and easy to obtain, and is favorable for realizing the control requirement with low cost.
The cooling and temperature control system of the heating medium system of the degradable polyester experimental device is characterized in that the automatic control system is a PLC control system or a DCS control system. Both belong to automatic control system, are favorable to using manpower sparingly cost, make temperature regulation realize automaticly, accuracy.
The cooling and temperature control system of the heating medium system of the degradable polyester experimental device is characterized in that the heating medium cooler is connected with the polyester reaction kettle in series. The serial connection process is simple and convenient to install.
Compared with the prior art, the utility model has the following beneficial effects:
1. the natural cooling mode of the heating medium of the conventional degradable polyester experimental device is changed, a forced cooling temperature control system is added, a temperature-adjusting refrigerator is used for refrigerating, and the cooling medium is used for exchanging heat with the heating medium, so that the aim of rapidly reducing the temperature of the polyester reaction kettle is fulfilled, and the requirement of experiments on temperature variability can be met.
2. The cooling temperature control equipment is simple, has small investment and is suitable for cooling various degradable polyester laboratory heating medium.
3. According to the temperature required by the material reaction, the automatic control system is used for adjusting the temperature of a heating medium inlet and outlet automatic regulating valve, a cooling medium inlet and outlet automatic regulating valve and a temperature-regulating refrigerator, so that the rapid and accurate adjustment of the temperature of the heating medium in a jacket of the polyester reaction kettle is realized, and the material reaction temperature is ensured to be strictly carried out according to the experimental set temperature.
4. The device can meet the rapid cooling requirement of continuous experiments, avoid the equipment to be in a high-temperature state for a long time, prolong the service life of the equipment and effectively improve the test frequency.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic diagram of an embodiment of the present utility model;
the reference numerals shown in the figures are: the cooling medium device comprises a cooling medium storage tank 1, a heating medium inlet temperature transmitter 2, a heating medium inlet automatic regulating valve 3, a heating medium cooler 4, a cooling medium outlet temperature transmitter 5, a cooling medium outlet automatic regulating valve 6, a heating medium outlet automatic regulating valve 7, a heating medium outlet temperature transmitter 8, a polyester reaction kettle 9, an exhaust processor 10, an oil-gas separator 11, a heating medium heating furnace 12, a heating medium circulating pump 13, a temperature-regulating refrigerator 14, a cooling medium circulating pump 15, a cooling medium inlet automatic regulating valve 16 and a cooling medium inlet temperature transmitter 17.
Detailed Description
As shown in figures 1-2, the cooling and temperature control system of the heat medium system of the degradable polyester experimental device is connected with the heat medium circulation system of the polyester device through a heat medium cooler.
When the polyester reaction kettle 9 needs to be heated, the automatic control system is used for closing the automatic cooling medium outlet regulating valve 6 and the automatic cooling medium inlet regulating valve 16, opening the automatic heating medium outlet regulating valve 7 and the automatic heating medium inlet regulating valve 3, and starting the heating medium circulating pump 13 to enable the heating medium to pass through the heating medium cooler 4, the polyester reaction kettle 9, the heating medium to pass through the oil-gas separator 11, the exhaust processor 10 and the heating medium heating furnace 12 in turn anticlockwise through the pipelines to form a heating medium circulating system; starting a heating medium heating furnace, and continuously heating to enable the heating medium to reach a set temperature so as to meet the heat exchange requirement of materials in the polyester reaction kettle.
When the polyester reaction needs to cool down and precisely control the temperature of the reaction materials, the phenomenon often occurs in the polycondensation stage of the polyester reaction, and the exothermic phenomenon of the polycondensation reaction materials occurs, so that the reaction temperature of the materials exceeds the reaction set temperature. When the difference value between the material reaction temperature and the set reaction temperature is less than or equal to 5 ℃, the automatic control system starts the temperature-regulating refrigerator 14 and the cooling medium circulating pump 15, and sequentially opens the cooling medium outlet automatic regulating valve 6 and the cooling medium inlet automatic regulating valve 16, signals of the heating medium inlet temperature transmitter 2, the heating medium outlet temperature transmitter 8, the cooling medium inlet temperature transmitter 17 and the cooling medium outlet temperature transmitter 5 are fed back to the automatic control system, and the automatic control system carries out logic conversion on the 4 signals, the material reaction temperature signals and the material reaction set value signals to realize the regulation of valve position opening of the cooling medium outlet automatic regulating valve and the heating medium outlet automatic regulating valve, thereby ensuring that the material reaction temperature is stably controlled within the error of plus or minus 0.5 ℃ of the set value;
when abnormal explosion occurs in the material reaction and the reaction temperature rises, once the difference between the material reaction temperature and a set value is larger than 5 ℃, the automatic control system ensures that the material reaction temperature is within a set range by adjusting the refrigeration temperature of the temperature-adjusting refrigerator 7, the automatic regulating valve of the cooling medium outlet and the valve position opening of the automatic regulating valve of the heating medium outlet in a coordinated manner.
When the polyester reaction kettle needs to be cooled rapidly in a large range, the automatic control system is used for closing the heating furnace of the heating medium, opening the automatic regulating valve of the cooling medium outlet, opening the automatic regulating valve of the cooling medium inlet, starting the cooling medium circulating pump and the temperature-regulating refrigerator, and opening the low-temperature mode of the temperature-regulating refrigerator, so that the heating medium of the polyester reaction kettle is cooled to the set temperature in the shortest time, and the feeding preparation is made for the experiment again.
In conclusion, the utility model can rapidly and accurately control the temperature of the polyester reaction kettle, and ensures the safe and smooth performance of experimental work. The foregoing is merely illustrative of the best possible embodiment of the utility model and is not therefore intended to limit the scope of the utility model. In addition to the embodiments described above, other embodiments of the utility model are possible. The technical proposal formed by equivalent substitution or equivalent transformation is not repeated herein, but is within the protection scope of the utility model.
Claims (7)
1. The cooling and temperature control system of the heat medium system of the degradable polyester experimental device is characterized by comprising a closed loop system formed by a heat medium cooler, a cooling medium outlet automatic regulating valve, a cooling medium storage tank, a cooling medium circulating pump, a temperature-regulating refrigerator and a cooling medium inlet automatic regulating valve which are connected with each other through pipelines clockwise, and an automatic control system which is connected with the heat medium inlet and outlet automatic regulating valves, the cooling medium inlet and outlet automatic regulating valve and the temperature-regulating refrigerator through signal lines.
2. The cooling and temperature control system of a heating medium system of a degradable polyester experimental device according to claim 1, wherein the heating medium cooler is connected with the polyester reaction kettle through a pipeline, a heating medium inlet is arranged at the bottom, a heating medium inlet automatic regulating valve and a heating medium inlet temperature transmitter are arranged on the heating medium inlet, a heating medium outlet is arranged at the top, a heating medium outlet automatic regulating valve and a heating medium outlet temperature transmitter are arranged on the heating medium outlet, a cooling medium inlet is arranged at the lower part of the left side, a cooling medium inlet automatic regulating valve and a cooling medium inlet temperature transmitter are arranged on the cooling medium inlet, a cooling medium outlet is arranged at the upper part of the right side, and a cooling medium outlet automatic regulating valve and a cooling medium outlet temperature transmitter are arranged on the cooling medium outlet automatic regulating valve and the cooling medium outlet temperature transmitter.
3. The cooling and temperature control system of a heat medium system of a degradable polyester experimental device according to claim 1 or 2, wherein the heat medium cooler is a tube array heat exchanger or a plate heat exchanger.
4. The cooling and temperature control system of the heat medium system of the degradable polyester experimental device according to claim 3, wherein the cooling medium of the heat medium system of the degradable polyester experimental device is mechanical oil.
5. The cooling and temperature control system of a heating medium system of a degradable polyester experimental device according to claim 4, wherein the temperature-adjusting refrigerator adopts freon as a refrigerant.
6. The cooling and temperature control system of the heating medium system of the degradable polyester experimental device according to claim 5, wherein the automatic control system is a PLC control system or a DCS control system.
7. The cooling and temperature control system of the heating medium system of the degradable polyester experimental device according to claim 6, wherein the heating medium cooler and the polyester reaction kettle are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321298482.4U CN220143343U (en) | 2023-08-29 | 2023-08-29 | Cooling and temperature control system of degradable polyester experimental device heating medium system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321298482.4U CN220143343U (en) | 2023-08-29 | 2023-08-29 | Cooling and temperature control system of degradable polyester experimental device heating medium system |
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| Publication Number | Publication Date |
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| CN220143343U true CN220143343U (en) | 2023-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321298482.4U Active CN220143343U (en) | 2023-08-29 | 2023-08-29 | Cooling and temperature control system of degradable polyester experimental device heating medium system |
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| CN (1) | CN220143343U (en) |
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- 2023-08-29 CN CN202321298482.4U patent/CN220143343U/en active Active
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