CN114950332A - External circulation ethoxylation reaction heat regulation and control system and regulation and control method thereof - Google Patents
External circulation ethoxylation reaction heat regulation and control system and regulation and control method thereof Download PDFInfo
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- CN114950332A CN114950332A CN202210815224.2A CN202210815224A CN114950332A CN 114950332 A CN114950332 A CN 114950332A CN 202210815224 A CN202210815224 A CN 202210815224A CN 114950332 A CN114950332 A CN 114950332A
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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
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- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/04—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers only
- C08G65/06—Cyclic ethers having no atoms other than carbon and hydrogen outside the ring
- C08G65/08—Saturated oxiranes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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Abstract
The invention discloses an external circulation ethoxylation reaction heat regulation and control system and a regulation and control method thereof, relating to the field of ethoxylation reaction equipment and comprising the following steps: the system comprises a reaction unit, an external circulation channel, a heat exchange unit capable of switching a heating mode or a cooling mode, a cooling water supply unit and a steam heat supply unit, wherein the cooling water supply unit comprises a deionized water storage tank for containing water for removing calcium, magnesium and chloride ions; according to the invention, the heating and cooling are switched by only one heat exchanger, so that the occupied space is reduced, the problem of scaling and intergranular corrosion can be avoided by using water for removing calcium, magnesium and chloride ions as cooling water, the service life of the device is prolonged, and meanwhile, the water outlet and the steam discharge port are communicated with the deionized water storage tank, so that the cyclic utilization of water resources can be realized.
Description
Technical Field
The invention relates to the field of ethoxylation reaction equipment, in particular to an external circulation ethoxylation reaction heat regulation and control system and a regulation and control method thereof.
Background
The external circulation ethoxylation device takes EO feeding speed as the main regulating quantity of reaction heat and the flow and the temperature of a heat exchange medium as the secondary regulating quantity of the reaction heat, the regulating aim is to ensure that the EO polymerization speed is maximum, the EO feeding speed and the flow of the heat exchange medium are regulated by valves, the temperature of the heat exchange medium is regulated by mixing cold and hot media, and the temperature and the pressure change of materials in a reaction kettle are the main regulating models.
The temperature change in the reaction kettle is determined by the factors of EO polymerization heat release and heat transfer in and out of an external heat exchanger, and when the EO polymerization heat release is larger than the heat transfer quantity of the heat exchanger, the temperature rises; on the contrary, the temperature is reduced, the temperature of the materials in the reaction kettle is increased, which means that the EO polymerization heat release is larger than the heat transfer heat, on the contrary, the polymerization heat release is smaller than the heat transfer heat, so the method for transferring heat in and out in the reaction is the most important link for determining the efficiency of the external circulation ethoxylation reaction.
The invention discloses an ethoxylation reaction device capable of controlling the temperature of a material through two heat exchangers, which is named as an efficient energy-saving steam-free ethoxylation reaction device and has the application number of 200810024366.7, but the arrangement of the two heat exchangers causes the space occupation to be larger, and the water resource cannot be fully utilized.
While heat exchangers with integrated heating and cooling are disclosed in the prior art, for example: the application number is '201710351762. X', the name is 'a spiral plate type heat exchanger integrating heating and cooling', when cooling and heating are integrated, after cooling water enters a heat exchange medium circulation cavity with higher temperature, calcium and magnesium ions can form a structure, and chloride ions can generate intergranular corrosion on welding seams of the heat exchanger, so that the service life of the heat exchanger is seriously influenced.
Therefore, an external circulation ethoxylation reaction heat regulation and control system which occupies a small space, has a long service life and can realize the cyclic utilization of water resources is urgently needed.
Disclosure of Invention
The invention aims to provide an external circulation ethoxylation reaction heat regulation and control system and a regulation and control method thereof, which are used for solving the problems in the prior art, realize the switching of heating and cooling by only utilizing one heat exchanger, reduce the occupied space, avoid the problems of scaling and intergranular corrosion by setting water for removing calcium, magnesium and chloride ions as cooling water, prolong the service life of a device and realize the cyclic utilization of water resources.
In order to achieve the purpose, the invention provides the following scheme: the invention provides an external circulation ethoxylation reaction heat regulation and control system which comprises a reaction unit, an external circulation channel, a heat exchange unit capable of switching a heating mode or a cooling mode, a cooling water supply unit and a steam heat supply unit, wherein the external circulation channel is communicated with a material circulation cavity of the heat exchange unit, the cooling water supply unit comprises a deionized water storage tank for containing water for removing calcium, magnesium and chloride ions, the deionized water storage tank and the steam heat supply unit are communicated with a heat exchange medium circulation cavity of the heat exchange unit, a water outlet for allowing cooling water after heat exchange and condensed water generated after steam heat exchange to flow out in the heat exchange medium circulation cavity is communicated with the deionized water storage tank, and a steam exhaust port of the heat exchange medium circulation cavity is communicated with the deionized water storage tank.
Preferably, a water outlet of the deionized water storage tank is connected with a cooling water inlet of the heat exchange medium circulation cavity through a cooler, a cooling water circulating pump is arranged between the water outlet of the deionized water storage tank and the cooling water inlet of the heat exchange medium circulation cavity, and a water outlet of the heat exchange medium circulation cavity is arranged at the bottom end of the heat exchange medium circulation cavity.
Preferably, the heat exchange unit is a spiral plate type heat exchanger, and the cooler is a plate type heat exchanger.
Preferably, the steam heat supply unit is a steam generating device, a steam outlet of the steam generating device is connected with a steam inlet of the heat exchange medium circulation cavity, and the steam outlet of the heat exchange medium circulation cavity is arranged at the top end of the heat exchange medium circulation cavity.
Preferably, valves are arranged at the cooling water inlet, the water outlet, the water vapor inlet and the steam outlet of the heat exchange medium circulation cavity.
Preferably, a steam discharge pipeline is arranged at the top end of the material circulation cavity and communicated with the deionized water storage tank.
Preferably, the steam discharge pipeline and the steam discharge port of the heat exchange medium circulation cavity share one pipeline communicated with the deionized water storage tank.
Preferably, the top end of the deionized water storage tank is provided with an exhaust passage, and the exhaust passage is provided with a safety pressure relief valve.
Preferably, a drainage channel is arranged at the bottom end of the deionized water storage tank, a drain valve is arranged on the drainage channel, and a deionized water inlet for supplying water for removing calcium, magnesium and chloride ions is arranged on the deionized water storage tank.
The invention also provides a regulation and control method of the external circulation ethoxylation reaction heat regulation and control system, which is characterized by comprising the following steps of:
s1: opening valves at a water vapor inlet and a steam outlet of the heat exchange medium circulation cavity, allowing water vapor to enter the heat exchange medium circulation cavity to exchange heat with the material to heat the material;
s2: the heated materials enter the reaction unit to carry out ethoxylation reaction, the reaction releases heat, and the materials with higher temperature are circulated into the material circulation cavity again through the external circulation channel;
s3: when the heating mode needs to be switched to the cooling mode, a valve of a water vapor inlet of a heat exchange medium circulation cavity is closed, a valve of a cooling water inlet of the heat exchange medium circulation cavity is opened, a cooling water circulating pump is started, deionized water enters the heat exchange medium circulation cavity after being cooled, after residual water vapor is squeezed out, a valve at a steam exhaust port is closed, a valve at a water outlet is opened, and the cooled deionized water exchanges heat with materials to realize the cooling of the materials;
s4: when the cooling mode needs to be switched to the heating mode, the valve of the cooling water inlet is closed, the valve of the water vapor inlet of the heat exchange medium circulation cavity is opened, water vapor is firstly introduced to extrude residual deionized water from the water outlet, the valve of the water outlet is closed after the residual deionized water is extruded, the valve of the steam outlet is opened, heat exchange is carried out between the water vapor and the material, and the material is heated.
Compared with the prior art, the invention has the following technical effects:
1. compared with the arrangement of a heating unit and a cooling unit, the heat exchange unit capable of switching a heating mode or a cooling mode is used for heating or cooling materials, so that the occupied space of the whole device is saved, on the basis, water for removing calcium, magnesium and chloride ions is contained in a deionized water storage tank for supplying cooling water, the problem that when the heat exchange unit is switched from the heating mode to the cooling mode, after the cooling water enters a heat exchange medium circulation cavity with higher temperature, the calcium and magnesium ions scale under the influence of high temperature to block the heat exchange medium circulation cavity, and meanwhile, the chloride ions form intergranular corrosion on welding seams of the heat exchange unit at high temperature to cause leakage of the heat exchange unit can be effectively avoided, the normal operation of the heat exchange unit is effectively ensured, the service life of the heat exchange unit is prolonged, and in addition, the cooling water after heat exchange, The condensed water generated after the steam heat exchange and the waste steam discharged from the steam discharge port all enter the deionized water storage tank, so that the water resource is recycled, and the resource utilization rate is improved.
2. According to the invention, the cooler is arranged to cool the deionized water supplied to the heat exchange medium circulation cavity of the heat exchange unit from the deionized water storage tank, so that the cooling effect on the material is improved.
3. According to the invention, the steam discharge pipeline is arranged at the top end of the material circulation cavity and communicated with the deionized water storage tank, so that steam generated during material heating can be utilized, and the utilization rate of resources is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an external circulation ethoxylation reaction heat regulation system of the present invention;
wherein, 1, a reaction kettle; 2. a material circulating pump; 3. a rotating plate heat exchanger; 4. a deionized water storage tank; 5. a cooling water inlet; 6. a water outlet; 7. a water vapor inlet; 8. a steam outlet; 9. a steam generating device; 10. a plate heat exchanger; 11. a cooling water circulation pump; 12. a safety relief valve; 13. a water escape valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention aims to provide an external circulation ethoxylation reaction heat regulation and control system and a regulation and control method thereof, which are used for solving the problems in the prior art, realize the switching of heating and cooling by only using one heat exchanger, reduce the occupied space, avoid the problems of scaling and intergranular corrosion by setting water for removing calcium, magnesium and chloride ions as cooling water, prolong the service life of a device and realize the cyclic utilization of water resources.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, an external circulation ethoxylation reaction heat regulation and control system is provided, including a reaction unit, an external circulation channel, a heat exchange unit capable of switching a heating mode or a cooling mode, a cooling water supply unit and a steam heat supply unit, where the external circulation channel is communicated with a material circulation cavity of the heat exchange unit, the cooling water supply unit includes a deionized water storage tank 4 for storing water with calcium, magnesium and chloride ions removed, the deionized water storage tank 4 and the steam heat supply unit are both communicated with a heat exchange medium circulation cavity of the heat exchange unit, a water outlet 6 in the heat exchange medium circulation cavity for allowing cooling water after heat exchange and condensed water generated after steam heat exchange to flow out is communicated with the deionized water storage tank 4, a steam outlet 8 in the heat exchange medium circulation cavity is communicated with the deionized water storage tank 4, and a heat exchange unit capable of switching a heating mode or a cooling mode is used to heat or cool a material Compared with the arrangement of a heating unit and a cooling unit, the occupied space of the whole device is saved, on the basis, water with calcium, magnesium and chloride ions removed is contained in the deionized water storage tank 4 for supplying cooling water, the problem that the heat exchange unit leaks due to the fact that the calcium and magnesium ions are scaled under the influence of high temperature and intercrystalline corrosion is formed on the welding seams of the heat exchange unit under the high temperature when the heat exchange unit is switched from a heating mode to a cooling mode can be effectively avoided when the cooling water enters the heat exchange medium circulation cavity with higher temperature to block the heat exchange medium circulation cavity, the normal operation of the heat exchange unit is effectively guaranteed, the service life of the heat exchange unit is prolonged, in addition, cooling water after heat exchange, condensate water generated after heat exchange of water vapor and waste vapor discharged from the vapor discharge port 8 all enter the deionized water storage tank 4, and the cyclic utilization of water resources is realized, the resource utilization rate is improved, the heat supply unit is selected as the steam heat supply unit, and the steam does not contain calcium, magnesium and chloride ions, so that the environment that the deionized water storage tank 4 does not contain the calcium, magnesium and chloride ions can not be damaged after condensed water generated after the steam heat exchange and waste steam discharged from the steam discharge port 8 enter the deionized water storage tank 4.
In order to improve the cooling effect of the heat exchange unit, the water outlet of the deionized water storage tank 4 is connected with the cooling water inlet 5 of the heat exchange medium circulation cavity through a cooler, a cooling water circulating pump 11 is arranged between the water outlet of the deionized water storage tank 4 and the cooling water inlet 5 of the heat exchange medium circulation cavity, the water outlet 6 of the heat exchange medium circulation cavity is arranged at the bottom end of the heat exchange medium circulation cavity, deionized water cooled by the cooler enters the heat exchange medium circulation cavity for heat exchange, and meanwhile, the deionized water returns to the deionized water storage tank 4 after heat exchange and can be cooled by the cooler again, so that the cooling capacity of the deionized water is still kept when the deionized water is recycled.
Since the cooling medium in the cooler does not enter the circulation path of the deionized water, the cooling medium of the cooler may be selected from common cooling water.
In this embodiment, the heat exchange unit is a spiral plate heat exchanger 3, the cooler is a plate heat exchanger 10, and other heat exchangers may be selected according to actual conditions.
The steam heat supply unit is a steam generating device 9, the steam generating device generates steam with higher temperature by heating water, a steam outlet 8 of the steam generating device 9 is connected with a steam inlet 7 of the heat exchange medium circulation cavity, and the steam outlet 8 of the heat exchange medium circulation cavity is arranged at the top end of the heat exchange medium circulation cavity.
Valves are arranged at a cooling water inlet 5, a water outlet 6, a water vapor inlet 7 and a steam outlet 8 of the heat exchange medium circulation cavity, and in order to improve the intelligence of the system, the control system can be used for controlling the opening and closing of each valve so as to realize the switching between a cooling mode and a heating mode.
Because the material need heat drying process to it when putting into outer circulation system, also can produce steam during the heating, consequently, the top of material circulation chamber sets up the steam discharge pipeline, the steam discharge pipeline with deionized water storage tank 4 intercommunication for the steam that produces when heating the material also can be utilized, has improved the utilization ratio of resource greatly.
The steam discharge pipeline and the steam discharge port 8 of the heat exchange medium circulation cavity share one pipeline communicated with the deionized water storage tank 4, so that the use of the pipeline is saved, the production cost of the device is reduced, specifically, the steam discharge pipeline, the steam discharge port 8 and the deionized water storage tank 4 can be connected through a three-way pipe, at the moment, valves are required to be arranged between the three-way pipe and the steam discharge pipeline and between the three-way pipe and the steam discharge port 8, and the control of exhaust of the three-way pipe and the steam discharge port is realized.
Because the steam that produces after exhaust steam and material are dried all inputs to deionized water storage tank 4 in, in order to avoid the pressure rise in deionized water storage tank 4, consequently be provided with exhaust passage on the 4 tops of deionized water storage tank, the last safety relief valve 12 that is provided with of exhaust passage.
In order to conveniently replace the deionized water, a drain passage is arranged at the bottom end of the deionized water storage tank 4, a drain valve 13 is arranged on the drain passage, and a deionized water inlet for supplying water for removing calcium, magnesium and chloride ions is arranged on the deionized water storage tank 4.
The reaction unit is a reaction kettle 1, and the external circulation system comprises a circulation channel and a material circulation pump 2 arranged on the circulation channel.
The invention also provides a regulation and control method of the external circulation ethoxylation reaction heat regulation and control system, which comprises the following steps:
s1: a valve at a steam inlet 7 and a steam outlet 8 of the heat exchange medium circulation cavity is opened, a steam generating device 9 generates steam, the steam enters the heat exchange medium circulation cavity to exchange heat with the material to heat the material, and the steam generated by the heated material and the waste steam flow into the cooling water storage tank together;
s2: the heated materials enter the reaction unit to carry out ethoxylation reaction, the reaction releases heat, and the materials with higher temperature circulate to the material circulation cavity again through the external circulation channel;
s3: when the heating mode needs to be switched to the cooling mode, a valve of a water vapor inlet 7 of a heat exchange medium circulation cavity is closed, a valve of a cooling water inlet 5 of the heat exchange medium circulation cavity is opened, a cooling water circulating pump 11 is started, deionized water enters the heat exchange medium circulation cavity after being cooled, after residual water vapor is extruded, a valve at a steam outlet 8 is closed, a valve at a water outlet 6 is opened, and the cooled deionized water exchanges heat with materials to realize the cooling of the materials;
s4: when the cooling mode needs to be switched to the heating mode, the valve of the cooling water inlet 5 is closed, the valve of the water vapor inlet 7 of the heat exchange medium circulation cavity is opened, water vapor is firstly introduced to extrude residual deionized water from the water outlet 6, after the residual deionized water is extruded, the valve of the water outlet 6 is closed, the valve of the steam discharge port 8 is opened, and the water vapor exchanges heat with the material to heat the material.
The adaptation according to the actual needs is within the scope of the invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. The external circulation ethoxylation reaction heat regulation and control system is characterized by comprising a reaction unit, an external circulation channel, a heat exchange unit capable of switching a heating mode or a cooling mode, a cooling water supply unit and a steam heat supply unit, wherein the external circulation channel is communicated with a material circulation cavity of the heat exchange unit, the cooling water supply unit comprises a deionized water storage tank for containing water for removing calcium, magnesium and chloride ions, the deionized water storage tank and the steam heat supply unit are communicated with a heat exchange medium circulation cavity of the heat exchange unit, a water outlet for allowing cooling water after heat exchange and condensed water generated after steam heat exchange to flow out in the heat exchange medium circulation cavity is communicated with the deionized water storage tank, and a steam outlet of the heat exchange medium circulation cavity is communicated with the deionized water storage tank.
2. The system for regulating and controlling the quantity of heat generated by the ethoxylation reaction of an external circulation of claim 1, wherein the water outlet of the deionized water storage tank is connected with the cooling water inlet of the heat exchange medium circulation chamber through a cooler, a cooling water circulation pump is arranged between the water outlet of the deionized water storage tank and the cooling water inlet of the heat exchange medium circulation chamber, and the water outlet of the heat exchange medium circulation chamber is arranged at the bottom end of the heat exchange medium circulation chamber.
3. The system for regulating and controlling the heat of an external circulation ethoxylation reaction of claim 2, wherein the heat exchange unit is a rotary plate heat exchanger and the cooler is a plate heat exchanger.
4. The system for regulating and controlling the heat of the external circulation ethoxylation reaction of claim 2, wherein the water vapor heating unit is a water vapor generating device, a vapor outlet of the water vapor generating device is connected with a water vapor inlet of the heat exchange medium circulation cavity, and a vapor outlet of the heat exchange medium circulation cavity is arranged at the top end of the heat exchange medium circulation cavity.
5. The system for regulating and controlling the heat of the external circulation ethoxylation reaction of claim 4, wherein valves are arranged at the cooling water inlet, the water outlet, the water vapor inlet and the steam outlet of the heat exchange medium circulation cavity.
6. The system for regulating and controlling the heat of an external circulation ethoxylation reaction of claim 1, wherein a steam discharge pipeline is arranged at the top end of the material circulation cavity and is communicated with the deionized water storage tank.
7. The system for regulating and controlling the heat of an external circulation ethoxylation reaction of claim 6, wherein the steam discharge pipeline and the steam discharge port of the heat exchange medium circulation cavity share a pipeline communicated with the deionized water storage tank.
8. The system for regulating and controlling the heat of an external circulation ethoxylation reaction of claim 1, wherein an exhaust passage is arranged at the top end of the deionized water storage tank, and a safety pressure relief valve is arranged on the exhaust passage.
9. The system for regulating and controlling the heat of an external circulation ethoxylation reaction of claim 8, wherein a drain channel is arranged at the bottom end of the deionized water storage tank, a drain valve is arranged on the drain channel, and a deionized water inlet for supplying water for removing calcium, magnesium and chloride ions is arranged on the deionized water storage tank.
10. A regulation and control method of an external circulation ethoxylation reaction heat regulation and control system is characterized by comprising the following steps:
s1: opening valves at a water vapor inlet and a steam outlet of the heat exchange medium circulation cavity, allowing water vapor to enter the heat exchange medium circulation cavity to exchange heat with the material to heat the material;
s2: the heated materials enter the reaction unit to carry out ethoxylation reaction, the reaction releases heat, and the materials with higher temperature are circulated into the material circulation cavity again through the external circulation channel;
s3: when the heating mode needs to be switched to the cooling mode, a valve of a water vapor inlet of a heat exchange medium circulation cavity is closed, a valve of a cooling water inlet of the heat exchange medium circulation cavity is opened, a cooling water circulating pump is started, deionized water enters the heat exchange medium circulation cavity after being cooled, after residual water vapor is squeezed out, a valve at a steam exhaust port is closed, a valve at a water outlet is opened, and the cooled deionized water exchanges heat with materials to realize the cooling of the materials;
s4: when the cooling mode needs to be switched to the heating mode, the valve of the cooling water inlet is closed, the valve of the water vapor inlet of the heat exchange medium circulation cavity is opened, water vapor is firstly introduced to extrude residual deionized water from the water outlet, the valve of the water outlet is closed after the residual deionized water is extruded, the valve of the steam outlet is opened, heat exchange is carried out between the water vapor and the material, and the material is heated.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210815224.2A CN114950332A (en) | 2022-07-08 | 2022-07-08 | External circulation ethoxylation reaction heat regulation and control system and regulation and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210815224.2A CN114950332A (en) | 2022-07-08 | 2022-07-08 | External circulation ethoxylation reaction heat regulation and control system and regulation and control method thereof |
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