Heat exchange system for producing ethylene propylene diene monomer and polymerization reactor

Abstract

The utility model provides a heat exchange system for producing ethylene propylene diene monomer and a polymerization reactor, the heat exchange system is arranged on a polymerization kettle and comprises a first heat exchanger, a second heat exchanger and a third heat exchanger, the first heat exchanger is internally provided with a heat dissipation channel and a first refrigerant channel, and the two ends of the heat dissipation channel are communicated with the interior of the polymerization kettle; a first water pump is arranged between the reaction kettle and the polymerization kettle; a second refrigerant channel is arranged in the second heat exchanger; a third refrigerant channel is arranged in the third heat exchanger; the first refrigerant channel, the second refrigerant channel and the third refrigerant channel are communicated to form a refrigerant loop, and a radiator, a second water pump and a control valve assembly are further arranged; the three heat exchangers are used for dissipating heat of the polymerization kettle, the heat dissipation efficiency can be improved, the three refrigerant channels are communicated to form a refrigerant loop, the control valve assembly is used for controlling the flowing sequence of refrigerants between the first heat exchanger and the second heat exchanger according to the temperature of the working area of the heat exchangers, cascade heat exchange is achieved, the energy of the refrigerants is utilized to the maximum degree, and the heat dissipation efficiency is improved. The use cost is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of polymerization reactors, in particular to a heat exchange system for producing ethylene-propylene-diene rubber and a polymerization reactor. BACKGROUND

[0002] The ethylene-propylene-diene rubber is a synthetic rubber material widely used in the fields of automobiles, buildings and electric power, and has excellent heat resistance, weather resistance and chemical stability, so that the ethylene-propylene-diene rubber can maintain good performance in various harsh environments. The ethylene-propylene-diene rubber is mainly produced by a polymerization reactor. Through the action of high temperature, high pressure and a specific catalyst, monomers such as ethylene, propylene and non-polymerized diene are subjected to polymerization reaction, and finally the ethylene-propylene-diene rubber polymer is formed. Since a large amount of heat is generated in the polymerization reaction, the efficiency of a single heat dissipation device is poor, and the use of multiple devices for heat dissipation will cause energy waste and is not conducive to cost reduction. CONTENT OF THE INVENTION

[0003] The application aims at the above problems and provides a heat exchange system for producing ethylene-propylene-diene rubber and a polymerization reactor.

[0004] In a first aspect, the application provides a heat exchange system for producing ethylene-propylene-diene rubber, which is arranged on a polymerization kettle and comprises:

[0005] A first heat exchanger, which has a heat dissipation channel and a first refrigerant channel inside, and the two ends of the heat dissipation channel are respectively communicated with the inside of the polymerization kettle, and a first water pump is further communicated between one end of the heat dissipation channel and the polymerization kettle.

[0006] A second heat exchanger, which is arranged inside the polymerization kettle and has a second refrigerant channel inside.

[0007] A third heat exchanger, which is arranged on the outer wall of the polymerization kettle and has a third refrigerant channel inside.

[0008] The first refrigerant channel, the second refrigerant channel and the third refrigerant channel are communicated to form a refrigerant loop, and a radiator, a second water pump and a control valve assembly are further arranged in the refrigerant loop. The control valve assembly is used to control the flow sequence of the refrigerant between the first refrigerant channel and the second refrigerant channel, so as to realize the step-by-step utilization of the refrigerant energy.

[0009] According to the technical scheme provided in some embodiments of the present application, the control valve assembly comprises a first three-way valve, a first end of the first three-way valve is communicated with an output end of the radiator, a second end and a third end of the first three-way valve are respectively communicated with a first end of a second three-way valve and a first end of a third three-way valve, a second end of the second three-way valve and a second end of the third three-way valve are sequentially communicated with the first refrigerant channel and the second refrigerant channel, a third end of the second three-way valve is communicated with a second end of a fourth three-way valve, a third end of the third three-way valve is communicated with a third end of the fourth three-way valve, and a first end of the fourth three-way valve is communicated with the second water pump through the third refrigerant channel, and the second water pump is communicated with an input end of the radiator.

[0010] According to the technical scheme provided in some embodiments of the present application, the control valve assembly has a first state, when in the first state, the first end and the second end of the first three-way valve are communicated, the first end and the second end of the second three-way valve are communicated, the second end and the third end of the third three-way valve are communicated, the third end and the first end of the fourth three-way valve are communicated, and the second water pump, the radiator, the first refrigerant channel, the second refrigerant channel and the third refrigerant channel are sequentially communicated to form a first loop.

[0011] According to the technical scheme provided in some embodiments of the present application, the control valve assembly also has a second state, when in the second state, the first end and the third end of the first three-way valve are communicated, the first end and the second end of the third three-way valve are communicated, the second end and the third end of the second three-way valve are communicated, the second end and the first end of the fourth three-way valve are communicated, and the second water pump, the radiator, the second refrigerant channel, the first refrigerant channel and the third refrigerant channel are sequentially communicated to form a second loop.

[0012] According to the technical scheme provided in some embodiments of the present application, the input end of the heat dissipation channel is provided with a first detection member, and the first detection member is used for detecting the temperature of the fluid output in the polymerization kettle; the second heat exchanger is provided with a second detection member, and the second detection member is used for detecting the temperature of the fluid inside the polymerization kettle.

[0013] According to the technical scheme provided in some embodiments of the present application, a controller is further included, the controller is electrically connected with the first detection member and the second detection member respectively, and the control valve assembly can be controlled according to a first temperature detected by the first detection member and a second temperature detected by the second detection member, so as to adjust the flow sequence of the refrigerant between the first refrigerant channel and the second refrigerant channel.

[0014] According to the technical scheme provided in some embodiments of the present application, one side of the radiator is further provided with a fan.

[0015] In a second aspect, the present application provides a reaction device for producing ethylene propylene diene rubber, comprising a heat exchange system for producing ethylene propylene diene rubber as described above, and further comprising a polymerization kettle, wherein the polymerization kettle is provided with a stirring assembly for stirring the fluid inside the polymerization kettle, and the top of the polymerization kettle is provided with an evaporation port.

[0016] Compared with the prior art, the present application has the following beneficial effects: the present application provides a heat exchange system for producing ethylene propylene diene rubber, which is arranged on a polymerization kettle and comprises a first heat exchanger, a second heat exchanger and a third heat exchanger, the first heat exchanger has a heat dissipation channel and a first coolant channel inside, the two ends of the heat dissipation channel are respectively communicated with the inside of the polymerization kettle, and a first water pump is further arranged between one end of the heat dissipation channel and the polymerization kettle; the second heat exchanger is arranged inside the polymerization kettle and has a second coolant channel inside; the third heat exchanger is arranged on the outer wall of the polymerization kettle and has a third coolant channel inside; the first coolant channel, the second coolant channel and the third coolant channel are communicated to form a coolant loop, and a radiator, a second water pump and a control valve assembly are further arranged in the coolant loop, and the control valve assembly can adjust the flow sequence of the coolant between the first coolant channel and the second coolant channel; the use of the three heat exchangers for heat dissipation of the fluid inside the polymerization kettle can effectively increase the heat dissipation efficiency of the polymerization kettle, and the coolant channels of the three heat exchangers are communicated to form a coolant loop, the control valve assembly is used to control the flow sequence of the coolant between the first coolant channel and the second coolant channel according to the temperature of the working area of the heat exchanger, so that the coolant can realize cascade heat exchange between the three heat exchangers, and the energy of the coolant can be maximized to reduce the use cost.

[0017] It should be understood that the description of technical features, technical solutions, beneficial effects or similar language in the present application does not imply that all features and advantages can be achieved in any single embodiment. On the contrary, it can be understood that the description of a feature or a beneficial effect means that the specific technical feature, technical solution or beneficial effect is included in at least one embodiment. Therefore, the description of technical features, technical solutions or beneficial effects in the specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and beneficial effects described in the present embodiment can be combined in any appropriate manner. Those skilled in the art will understand that the embodiments can be implemented without one or more specific technical features, technical solutions or beneficial effects of a specific embodiment. In other embodiments, additional technical features and beneficial effects can be identified in specific embodiments that do not embody all embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to make the skilled in the art better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings. Obviously, the drawings in the following description only show some embodiments of the present application, and all other embodiments obtained by the skilled in the art without any creative effort based on these drawings should belong to the protection scope of the present application.

[0019] Figure 1 A structure schematic diagram of a refrigerant circuit of a heat exchange system for producing EPDM provided in Embodiment 1 of the present application;

[0020] Figure 2 A structure schematic diagram of a polymerization reactor for producing EPDM provided in Embodiment 2 of the present application.

[0021] The text annotations in the drawings represent:

[0022] 1, first heat exchanger; 2, second heat exchanger; 3, third heat exchanger; 4, polymerization kettle; 5, first water pump; 6, radiator; 7, second water pump; 8, fan; 9, evaporation port; 10, rotating shaft; 11, stirring paddle; 12, liquid flinger; 101, first three-way valve; 102, second three-way valve; 103, third three-way valve; 104, fourth three-way valve. DETAILED DESCRIPTION

[0023] In order to make the skilled in the art better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings. Obviously, the drawings in the following description only show some embodiments of the present application, and all other embodiments obtained by the skilled in the art without any creative effort based on these drawings should belong to the protection scope of the present application.

[0024] It should be noted that similar reference numerals and letters in the following drawings represent similar items, thus, once an item is defined in one drawing, it need not be further defined and explained in the subsequent drawings. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units need not be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0025] Embodiment 1

[0026] As mentioned in the background section, to address the problems existing in the prior art, this embodiment provides a heat exchange system for producing EPDM rubber, installed on the polymerization reactor 4, comprising:

[0027] The first heat exchanger 1 has a heat dissipation channel and a first refrigerant channel inside, and the two ends of the heat dissipation channel are respectively connected to the inside of the polymerization reactor 4.

[0028] The second heat exchanger 2 is located inside the polymerization reactor 4, and the second heat exchanger 2 has a second refrigerant channel inside.

[0029] The third heat exchanger 3 is located on the outer wall of the polymerization reactor 4, and the third heat exchanger 3 has a third refrigerant channel inside.

[0030] The first refrigerant passage, the second refrigerant passage, and the third refrigerant passage are connected to form a refrigerant circuit. The refrigerant circuit is also equipped with a radiator 6 and a control valve assembly. The control valve assembly is used to control the flow sequence of refrigerant between the first refrigerant passage, the second refrigerant passage, and the third refrigerant passage, so as to realize the cascade utilization of refrigerant energy.

[0031] like Figure 1 As shown, the polymerization reactor 4 is similar to a tank structure, containing a fluid for the polymerization reaction. The first heat exchanger 1 is a shell-and-tube heat exchanger, including a first heat exchange tube with a first refrigerant channel inside. A heat dissipation channel is formed between the outer shell of the first heat exchanger 1 and the outer wall of the first heat exchange tube. Two heat exchange ports are opened on the outer shell of the first heat exchanger 1, and the two heat exchange ports are respectively connected to the inside of the polymerization reactor 4 through conduits. A first water pump 5 is installed on one of the conduits. The first water pump 5 is a bidirectional water pump, used to drive the fluid in the polymerization reactor 4 into the first heat exchanger 1 through one of the conduits, exchange heat with the refrigerant in the first refrigerant channel, and then return to the reactor through the other conduit. Inside the polymerization reactor 4; the second heat exchanger 2 is a shell-and-tube heat exchanger, located inside the polymerization reactor 4 and fixed to the inner wall of the polymerization reactor 4. The second heat exchanger 2 includes a second heat exchange tube, and the second heat exchange tube has a second refrigerant channel inside; the third heat exchanger 3 is a jacketed heat exchanger, fitted on the outer wall of the polymerization reactor 4. The jacket has a third refrigerant channel inside. The first refrigerant channel, the second refrigerant channel and the third refrigerant channel are connected by a control valve assembly to form a refrigerant circuit. The refrigerant circuit is also equipped with a radiator 6 and a second water pump 7. The second water pump 7 is used to drive the refrigerant to absorb heat from the polymerization reactor 4 in the first refrigerant channel, the second refrigerant channel and the third refrigerant channel, and then the radiator 6 delivers the heat to the external environment.

[0032] Since the third heat exchanger 3 is a jacketed heat exchanger, which is arranged on the outer wall of the polymerizer 4 to dissipate heat from the fluid inside the polymerizer 4, the heat exchange efficiency of the third heat exchanger 3 is lower than that of the first heat exchanger 1 and the second heat exchanger 2. The heat exchange efficiency of the first heat exchanger 1 and the second heat exchanger 2 is related to the flow state and rate of the fluid stirred by the stirring assembly when the polymerization reaction is carried out inside the polymerizer 4. According to the temperature change of the working area of the first heat exchanger 1 and the second heat exchanger 2, the flow sequence of the refrigerant between the first refrigerant passage and the second refrigerant passage is adjusted, so that the refrigerant preferentially exchanges heat with the fluid with the highest temperature, thereby realizing cascade heat exchange and fully utilizing the energy of the refrigerant.

[0033] By arranging three heat exchangers, the fluid inside the polymerizer 4 is dissipated by external circulation heat exchange, internal heat exchange of the polymerizer 4, and external heat exchange of the polymerizer 4, which can effectively increase the heat dissipation efficiency. At the same time, the three refrigerant passages are connected to form a refrigerant loop. According to the temperature of the working area of the three heat exchangers, the flow sequence of the refrigerant between the first refrigerant passage and the second refrigerant passage is controlled by using the control valve assembly, thereby realizing cascade heat exchange, maximizing the use of the energy of the refrigerant, and reducing the use cost.

[0034] In a preferred embodiment, the control valve assembly includes a first three-way valve 101, a second three-way valve 102, a third three-way valve 103, and a fourth three-way valve 104. The first end of the first three-way valve 101 is connected to the output end of the radiator 6. The second end and the third end of the first three-way valve 101 are connected to the first end of the second three-way valve 102 and the first end of the third three-way valve 103, respectively. The second end of the second three-way valve 102 and the second end of the third three-way valve 103 are sequentially connected to the first refrigerant passage and the second refrigerant passage. The third end of the second three-way valve 102 is connected to the second end of the fourth three-way valve 104. The third end of the third three-way valve 103 is connected to the third end of the fourth three-way valve 104. The first end of the fourth three-way valve 104 is connected to the input end of the radiator 6 through the third refrigerant passage.

[0035] In a preferred embodiment, the control valve assembly has a first state. When in the first state, the first end and the second end of the first three-way valve 101 are connected, the first end and the second end of the second three-way valve 102 are connected, the second end and the third end of the third three-way valve 103 are connected, the third end and the first end of the fourth three-way valve 104 are connected, and the second water pump 7, the radiator 6, the first refrigerant passage, the second refrigerant passage, and the third refrigerant passage are sequentially connected to form a first loop.

[0036] In a preferred embodiment, the control valve assembly also has a second state. When in the second state, the first end and the third end of the first three-way valve 101 are connected, the first end and the second end of the third three-way valve 103 are connected, the second end and the third end of the second three-way valve 102 are connected, the second end and the first end of the fourth three-way valve 104 are connected, and the second water pump 7, the radiator 6, the second refrigerant passage, the first refrigerant passage, and the third refrigerant passage are sequentially connected to form a second loop.

[0037] like Figure 1 As shown, when the fluid temperature output from the polymerization reactor 4 under the drive of the second water pump 7 is higher than the fluid temperature in the area where the second heat exchanger 2 is located inside the polymerization reactor 4, the output end of the radiator 6 is connected to the first refrigerant channel through the first three-way valve 101 and the second three-way valve 102. The second refrigerant channel is connected to the third refrigerant channel through the third three-way valve 103 and the fourth three-way valve 104. The refrigerant absorbs heat by passing through the first, second, and third refrigerant channels in sequence under the drive of the second water pump 7, and then flows back to the input end of the radiator 6 after passing through the second water pump 7. The heat absorbed by the refrigerant is transported to the external environment through the radiator 6 and then circulated again, which is the first state mentioned above. When the fluid temperature output from the polymerization reactor 4 under the drive of the second water pump 7 is lower than the fluid temperature in the area where the second heat exchanger 2 is located inside the polymerization reactor 4, the first refrigerant channel is connected to the first refrigerant channel through the second three-way valve 101 and the second three-way valve 102. When the fluid temperature in the area is reached, the output end of radiator 6 is connected to the second refrigerant channel through the first three-way valve 101 and the third three-way valve 103. The first refrigerant channel is connected to the third refrigerant channel through the second three-way valve 102 and the fourth three-way valve 104. Driven by the second water pump 7, the refrigerant absorbs heat by passing through the second refrigerant channel, the first refrigerant channel and the third refrigerant channel in sequence. After flowing through the second water pump 7, it returns to the input end of radiator 6. The heat absorbed by the refrigerant is transported to the external environment through radiator 6 and then circulated again, which is the second state mentioned above. By switching the control valve assembly between the first state and the second state, the order in which the refrigerant passes through the first refrigerant channel and the second refrigerant channel can be changed, so that the refrigerant always maintains stepped heat exchange when passing through the three heat exchangers in sequence, thereby maximizing the utilization of cold energy.

[0038] Furthermore, when the control valve assembly switches between the first and second states, it will correspondingly change the direction of the refrigerant flow through the first refrigerant channel. Since the first heat exchanger 1 adopts a shell-and-tube heat exchanger, in order to ensure that the fluid with a higher temperature in the heat dissipation channel and the refrigerant in the first refrigerant channel have a large average temperature difference during heat exchange and improve heat exchange efficiency, the flow direction of the fluid in the heat dissipation channel is opposite to the flow direction of the refrigerant in the first refrigerant channel. Therefore, multi-way valves or reversing valves can be set at both ends of the heat dissipation channel to adjust the flow direction of the fluid in the heat dissipation channel according to the change of the flow direction of the refrigerant in the first heat dissipation channel, and the two always maintain opposite flow directions. The second heat exchange tube of the second heat exchanger 2 is an integrally formed S-shaped tube, which consists of multiple straight tubes and elbows. Two adjacent straight tubes are connected by elbows. Therefore, the flow direction of the refrigerant in two adjacent straight tubes is opposite, and the change of the flow direction of the refrigerant will not affect the heat exchange effect of the second heat exchanger 2.

[0039] In a preferred embodiment, the input end of the heat dissipation channel is provided with a first detection element, which is used to detect the temperature of the fluid output from the polymerization reactor 4; the second heat exchanger 2 is provided with a second detection element, which is used to detect the temperature of the fluid inside the polymerization reactor 4.

[0040] As shown in Figure 1 , the first detection member and the second detection member are both temperature sensors in the prior art, the first detection member is arranged at the input end of the heat dissipation passage for detecting the temperature of the fluid output from the polymerizer 4, and the second detection member is arranged on the outer wall of the second heat exchange tube of the second heat exchanger 2 for detecting the temperature of the fluid in the area of the polymerizer 4 where the second heat exchanger 2 is located.

[0041] Further, the first detection member can be arranged at both ends of the heat dissipation passage, and when the direction of the fluid in the heat dissipation passage changes, the first detection member at the corresponding input end position is used to detect the temperature of the fluid.

[0042] In a preferred embodiment, a controller is further included, which is electrically connected with the first detection member and the second detection member respectively, and can control the control valve assembly according to the first temperature detected by the first detection member and the second temperature detected by the second detection member, so as to adjust the flow sequence of the refrigerant between the first refrigerant passage and the second refrigerant passage.

[0043] As shown in Figure 1 , the controller is electrically connected with the first detection member and the second detection member respectively, the first detection member detects the temperature of the fluid output from the polymerizer 4, and the second detection member detects the temperature of the fluid in the area of the polymerizer 4 where the second heat exchanger 2 is located, and the controller adjusts the flow sequence of the refrigerant between the first refrigerant passage and the second refrigerant passage by comparing the temperatures.

[0044] The control valve assembly is initially in a first state, the first end and the second end of the first three-way valve 101 are communicated, the first end and the second end of the second three-way valve 102 are communicated, the second end and the third end of the third three-way valve 103 are communicated, the third end and the first end of the fourth three-way valve 104 are communicated, the radiator 6 output end is communicated with the first refrigerant channel through the first three-way valve 101 and the second three-way valve 102, the second refrigerant channel is communicated with the third refrigerant channel through the third three-way valve 103 and the fourth three-way valve 104, and the refrigerant sequentially passes through the first refrigerant channel, the second refrigerant channel and the third refrigerant channel under the driving of the second water pump 7; the first temperature detected by the first detection member and the second temperature detected by the second detection member are transmitted to the controller, the controller compares the first temperature and the second temperature, when the second temperature is higher than the first temperature, the controller makes the control valve assembly switch to a second state, the first end and the third end of the first three-way valve 101 are communicated, the first end and the second end of the third three-way valve 103 are communicated, the second end and the third end of the second three-way valve 102 are communicated, the second end and the first end of the fourth three-way valve 104 are communicated, the radiator 6 output end is communicated with the second refrigerant channel through the first three-way valve 101 and the third three-way valve 103, the first refrigerant channel is communicated with the third refrigerant channel through the second three-way valve 102 and the fourth three-way valve 104, and the refrigerant sequentially passes through the second refrigerant channel, the first refrigerant channel and the third refrigerant channel under the driving of the second water pump 7; when the second temperature is lower than the first temperature, the controller makes the control valve assembly remain in the first state.

[0045] In a preferred embodiment, one side of the radiator 6 is also provided with a fan 8.

[0046] As shown in Figure 1 , by arranging the fan 8, the heat exchange efficiency of the refrigerant in the radiator 6 and the external environment can be improved, and the speed of releasing heat by the refrigerant can be accelerated.

[0047] Embodiment 2

[0048] The embodiment provides a polymerization reactor for producing ethylene-propylene-diene rubber, which comprises the heat exchange system for producing ethylene-propylene-diene rubber in the embodiment 1, and further comprises a polymerization kettle 4, wherein the polymerization kettle 4 is provided with a stirring assembly for stirring the fluid in the polymerization kettle 4; and the top of the polymerization kettle 4 is further provided with an evaporation port 9.

[0049] As shown in Figure 2 , the stirring assembly comprises a driving member arranged at the top of the polymerization kettle 4, a rotating shaft 11 fixedly connected to the driving end of the driving member after penetrating through the top of the polymerization kettle 4, a stirring paddle 12 sleeved on the rotating shaft 11, and a liquid throwing disc 13 sleeved on the rotating shaft 11 above the stirring paddle 12, wherein the liquid throwing disc 13 can rotate around the axis of the rotating shaft 11 under the driving of the driving member, so that the liquid flowing on the liquid throwing disc 13 forms a water curtain, preventing the fluid in the polymerization kettle 4 from overflowing; and the top of the polymerization kettle 4 is further provided with an evaporation port 9, so that the fluid can also volatilize to the external environment through the evaporation port 9 for heat dissipation.

[0050] Working principle: when in use, the driving member, the first water pump 5 and the second water pump 7 are started, and initially the refrigerant flows through the first refrigerant passage, the second refrigerant passage and the third refrigerant passage in turn; when the temperature detected by the first detection member is lower than the temperature detected by the second detection member, the output end of the radiator 6 is connected to the second refrigerant passage through the first three-way valve 101 and the third three-way valve 103, the first refrigerant passage is connected to the third refrigerant passage through the second three-way valve 102 and the fourth three-way valve 104, and the refrigerant flows through the second refrigerant passage, the first refrigerant passage and the third refrigerant passage in turn under the driving of the second water pump 7 to absorb heat, and then flows back to the input end of the radiator 6 after passing through the second water pump 7, and the heat absorbed by the refrigerant is transported to the external environment through the radiator 6 and then recycled; when the temperature detected by the first detection member is higher than the temperature detected by the second detection member, the output end of the radiator 6 is connected to the first refrigerant passage through the first three-way valve 101 and the second three-way valve 102, and the second refrigerant passage is connected to the third refrigerant passage through the third three-way valve 103 and the fourth three-way valve 104, and the refrigerant flows through the first refrigerant passage, the second refrigerant passage and the third refrigerant passage in turn under the driving of the second water pump 7 to absorb heat, and then flows back to the input end of the radiator 6 after passing through the second water pump 7, and the heat absorbed by the refrigerant is transported to the external environment through the radiator 6 and then recycled.

[0051] The principles and implementation manners of the present application are described by using specific examples in the present text, and the above example descriptions are only for helping to understand the method and its core idea of the present application. The above descriptions are only preferred implementation manners of the present application, and it should be noted that due to the limited nature of the language expression, there are infinite specific structures, and for ordinary skilled persons in the technical field, some improvements, refinements or changes can be made without departing from the principles of the present application, and the above technical features can also be combined in an appropriate manner; these improvements, refinements, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, shall be regarded as the protection scope of the present application.

Claims

1. A heat exchange system for producing an ethylene-propylene-diene rubber, provided on a polymerizer (4), characterized in that, The application relates to a heat exchanger for a polymerization kettle, which comprises: a first heat exchanger (1) internally provided with a heat dissipation channel and a first refrigerant channel, the two ends of the heat dissipation channel being respectively communicated with the inside of the polymerization kettle (4), and a first water pump (5) being further communicated between one end of the heat dissipation channel and the polymerization kettle (4); a second heat exchanger (2) arranged in the polymerization kettle (4), and internally provided with a second refrigerant channel; a third heat exchanger (3) arranged on the outer wall of the polymerization kettle (4), and internally provided with a third refrigerant channel; the first refrigerant channel, the second refrigerant channel and the third refrigerant channel are communicated to form a refrigerant loop, and a radiator (6), a second water pump (7) and a control valve assembly are further arranged in the refrigerant loop, the control valve assembly is used for controlling the flow sequence of the refrigerant between the first refrigerant channel and the second refrigerant channel, so as to realize the step utilization of the refrigerant energy.

2. The heat exchange system for producing EPDM according to claim 1, wherein The control valve assembly comprises a first three-way valve (101), the first end of the first three-way valve (101) is communicated with the output end of the radiator (6), the second end and the third end of the first three-way valve (101) are respectively communicated with the first end of a second three-way valve (102) and the first end of a third three-way valve (103), the second end of the second three-way valve (102) and the second end of the third three-way valve (103) are sequentially communicated with the first refrigerant channel and the second refrigerant channel, the third end of the second three-way valve (102) is communicated with the second end of a fourth three-way valve (104), the third end of the third three-way valve (103) is communicated with the third end of the fourth three-way valve (104), and the first end of the fourth three-way valve (104) is communicated with the second water pump (7) through the third refrigerant channel, and the second water pump (7) is communicated with the input end of the radiator (6).

3. The heat exchange system for producing EPDM according to claim 2, wherein The control valve assembly has a first state, when in the first state, the first end and the second end of the first three-way valve (101) are communicated, the first end and the second end of the second three-way valve (102) are communicated, the second end and the third end of the third three-way valve (103) are communicated, the third end and the first end of the fourth three-way valve (104) are communicated, and the second water pump (7), the radiator (6), the first refrigerant channel, the second refrigerant channel and the third refrigerant channel are sequentially communicated to form a first loop.

4. The heat exchange system for producing EPDM according to claim 2, wherein The control valve assembly also has a second state, when in the second state, the first end and the third end of the first three-way valve (101) are communicated, the first end and the second end of the third three-way valve (103) are communicated, the second end and the third end of the second three-way valve (102) are communicated, the second end and the first end of the fourth three-way valve (104) are communicated, and the second water pump (7), the radiator (6), the second refrigerant channel, the first refrigerant channel and the third refrigerant channel are sequentially communicated to form a second loop.

5. The heat exchange system for producing EPDM according to claim 1, wherein The input end of the heat dissipation channel is provided with a first detection member for detecting the fluid temperature output in the polymerization kettle; the second heat exchanger is provided with a second detection member for detecting the fluid temperature inside the polymerization kettle.

6. The heat exchange system for producing EPDM according to claim 5, wherein Further comprising a controller electrically connected with the first detection member and the second detection member respectively, which can control the control valve assembly according to the first temperature detected by the first detection member and the second temperature detected by the second detection member, so as to adjust the flow sequence of the refrigerant between the first refrigerant channel and the second refrigerant channel.

7. The heat exchange system for producing EPDM according to claim 1, wherein One side of the heat dissipation device (6) is further provided with a fan (8).

8. A polymerization reactor for producing an ethylene-propylene-diene rubber, comprising a heat exchange system for producing an ethylene-propylene-diene rubber according to any one of claims 1 to 7, characterized in that Further comprising the polymerization kettle (4) provided with a stirring assembly for stirring the fluid inside the polymerization kettle (4); the top of the polymerization kettle (4) is further provided with an evaporation port (9).

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