Circulating condensation system

Abstract

The utility model relates to a circulating condensation system which comprises a reaction device, a heat exchanger, a cooler, a compressor and a vacuum device, and the reaction device is provided with a reactant outlet, a heat transfer medium inlet and a heat transfer medium outlet; the heat exchanger comprises a collecting barrel, a first coil pipe is arranged in the collecting barrel, and an inlet of the collecting barrel is communicated with a reactant outlet of the reaction device; the cooler comprises a shell, a second coil pipe is arranged in the shell, a shell inlet is communicated with a reaction device heat-transfer medium outlet, and a shell outlet is communicated with a reaction device heat-transfer medium inlet; the compressor outlet communicates with the second coil pipe refrigerant inlet through a refrigerant circulating pipeline, the second coil pipe refrigerant outlet communicates with the first coil pipe liquid inlet through a refrigerant circulating pipeline, and the first coil pipe liquid outlet communicates with the compressor inlet through a refrigerant circulating pipeline. And an expansion throttle valve is arranged on a pipeline through which the refrigerant outlet of the second coil pipe is communicated with the liquid inlet of the first coil pipe. The circulating condensation system provided by the utility model has the advantages of recycling heat, quickly condensing volatile matters at an ultralow temperature and effectively protecting a vacuum device.

Description

Technical Field

[0001] The utility model relates to a circulating condensation system. Background Art

[0002] In chemical synthesis and chemical production, reflux condensation and vacuum distillation are two important process operation links of the reaction system. The traditional reflux condensation process mainly uses a distillation column and a condenser to evaporate the reactants into a reflux tank, and then refluxes to the reactor through a U-shaped connection between the reflux tank and the reactor, thereby achieving the process goal of reflux condensation and realizing a full and complete reaction between the reactants. The coolant in the condenser plays the role of absorbing the heat of organic vapor. Vacuum distillation is an important method for separating and purifying compounds. It is particularly suitable for high-boiling point substances and those compounds that are easily decomposed, oxidized or polymerized by heat during atmospheric distillation. In the vacuum distillation process, the system pressure is reduced to allow the liquid to evaporate at a lower temperature, thereby reducing energy consumption and production costs.

[0003] However, the above-mentioned traditional processes do not fully recover volatile reactants or solvents, which not only causes waste but also pollutes the atmospheric environment. Utility Model Content

[0004] The utility model aims to provide a circulating condensation system.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A circulating condensation system, comprising a reaction device, a heat exchanger, a cooler, a compressor, and a vacuum device.

[0007] The reaction device has a reactant outlet, a heat transfer medium inlet, and a heat transfer medium outlet;

[0008] The heat exchanger comprises a collecting tube, a first coil is arranged in the collecting tube, the first coil has a liquid inlet and a liquid outlet, and the inlet of the collecting tube of the heat exchanger is connected to the reactant outlet of the reaction device;

[0009] The cooler comprises a shell, a second coil is arranged in the shell, the second coil has a refrigerant inlet and a refrigerant outlet, the shell inlet is connected to the heat transfer medium outlet of the reaction device, and the shell outlet is connected to the heat transfer medium inlet of the reaction device;

[0010] The outlet of the compressor and the refrigerant inlet of the second coil, the refrigerant outlet of the second coil and the liquid inlet of the first coil, and the liquid outlet of the first coil and the inlet of the compressor are connected through a refrigerant circulation pipeline;

[0011] An expansion throttle valve is provided on the pipeline connecting the refrigerant outlet of the second coil and the liquid inlet of the first coil;

[0012] The vacuum device is communicated with the heat exchanger.

[0013] In some embodiments, the refrigerant inlet and the refrigerant outlet of the second coil are both located outside the shell and on the same side outside the shell.

[0014] In some embodiments, the liquid inlet and the liquid outlet of the first coil are both located below the collecting tube.

[0015] In some embodiments, the collecting cylinder of the heat exchanger includes an inner cylinder, an outer cylinder, and a sealing cover. The inner cylinder is arranged in the outer cylinder, an insulating interlayer is formed between the inner cylinder and the outer cylinder, and the sealing cover is arranged on the top of the inner cylinder and the outer cylinder.

[0016] In some embodiments, the liquid inlet and the liquid outlet of the first coil are both located below the collecting tube.

[0017] In some embodiments, the first coil and the second coil are both spiral-shaped.

[0018] In some embodiments, the system further comprises a heat transfer medium intermediate tank, and the heat transfer medium intermediate tank is connected to the heat transfer medium inlet and the shell outlet of the reaction device.

[0019] In some embodiments, a control valve is provided on the pipeline connecting the heat transfer medium intermediate tank and the shell outlet.

[0020] In some embodiments, the heat transfer medium intermediate tank includes a tank body, an upper head and a lower head, the upper head and the lower head are respectively arranged at the upper end and the lower end of the tank body, the tank body is cylindrical, the cross-sections of the upper head and the lower head are both elliptical, and the lower side of the lower head is provided with a discharge pipe connected to the tank body, and a discharge valve is provided on the discharge pipe.

[0021] In some embodiments, the system further comprises a heat transfer medium circulation pump, and the heat transfer medium circulation pump is disposed on a pipeline connecting the heat transfer medium outlet of the reaction device and the shell inlet.

[0022] In some embodiments, the second coil includes a tube body, a first lead pipe, and a second lead pipe, the tube body having a first end and a second end, the first end of the tube body being connected to one end of the first lead pipe, the second end of the tube body being connected to one end of the second lead pipe, the other end of the first lead pipe extending to the outside of the shell and connected to the compressor, and the other end of the second lead pipe extending to the outside of the shell and connected to the expansion throttle valve.

[0023] In some embodiments, the vacuum device includes a vacuum buffer tank and a vacuum pump, the vacuum buffer tank is connected to the heat exchanger, and the vacuum pump is connected to the vacuum buffer tank.

[0024] In some embodiments, the system further includes a connecting pipe, a vent pipe, and a three-way valve. The other end of the connecting pipe and one end of the vent pipe are connected to the vacuum buffer tank through the three-way valve, and the other end of the vent pipe is connected to the atmosphere.

[0025] In some embodiments, the system further comprises an exhaust pipe, one end of which is connected to the vacuum pump, and the other end of which is connected to the atmosphere.

[0026] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0027] The circulating condensation system provided by the utility model can quickly condense the volatile organic matter flowing into the collecting tube of the heat exchanger by arranging a heat exchanger, a cooler and a compressor, thereby ensuring that no volatile gas invades the subsequent vacuum device; at the same time, the heat transfer medium is passed into the shell through the cooler, and the refrigerant enters the second coil, which can heat the heat transfer medium, realize the recycling of system heat, and achieve energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Attached Figure 1 A structural diagram of a circulating condensation system provided by the utility model;

[0029] Attached Figure 2 The structural diagram of the circulating condensation system provided by the utility model (without vacuum device);

[0030] Attached Figure 3 For attachment Figure 1 A structural diagram showing the connection between the heat exchanger and the cooler;

[0031] Attached Figure 4 For attachment Figure 1 Structural diagram of the connection between the heat exchanger and the vacuum device;

[0032] Attached Figure 5 For attachment Figure 1 Structural diagram of the heat exchanger.

[0033] In the above attached figure:

[0034] 1-heat exchanger, 101-outer cylinder, 102-inner cylinder, 103-insulating interlayer, 104-first cover, 105-second cover, 106-discharging valve, 107-tube body, 108-first outlet pipe, 109-second outlet pipe, 110-second protrusion;

[0035] 2-vacuum buffer tank, 21-vacuum pressure gauge, 22-feeding valve, 23-first flange pipe; 3-vacuum pump, 31-connecting pipe, 32-exhaust pipe;

[0036] 4-compressor, 41-liquid inlet pipe, 42-liquid outlet pipe; 5-expansion throttle valve;

[0037] 6-cooler, 61-tube body, 62-fourth flange tube, 63-second guide tube, 64-fifth flange tube, 65-first guide tube, 66-shell;

[0038] 7-heat transfer medium circulation pump; 8-control valve;

[0039] 9-intermediate tank for heat transfer medium, 91-discharge valve, 92-second flange pipe, 93-third flange pipe, 94-tank body, 95-upper head, 96-lower head;

[0040] 11-reaction device, 111-sixth flange pipe, 112-seventh flange pipe, 113-eighth flange pipe; 12-connecting pipe; 13-vent pipe; 14-three-way valve; 15-feeding hollow screw. DETAILED DESCRIPTION

[0041] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] See also Figures 1 to 5 The circulating condensation system shown in the figure includes a reaction device 11, a heat exchanger 1, a cooler 6, a compressor 4, and a vacuum device. The reaction device 11 has a reactant outlet, a heat transfer medium inlet, and a heat transfer medium outlet. The reaction device 11 includes a reactor, and a reactant outlet is opened on the reactor. The reactant is a volatile organic compound. A jacket is arranged outside the reactor, and a heat transfer medium flows in and out of the jacket. The heat transfer medium is used to heat the reactant in the reactor; the heat exchanger 1 includes a collecting tube, and a first coil is arranged in the collecting tube. The first coil has a liquid inlet and a liquid outlet. The liquid inlet of the first coil , the liquid outlets are both located outside the collecting tube and are both located below the collecting tube (on the same side), the inlet of the collecting tube of the heat exchanger 1 is connected to the reactant outlet of the reaction device 11 through a pipeline; the cooler 6 includes a shell 66, the inlet of the shell 66 is connected to the heat transfer medium outlet of the reaction device 11 through a pipeline, the outlet of the shell 66 is connected to the heat transfer medium inlet of the reaction device 11 through a pipeline, a second coil is arranged in the shell 66, the second coil has a refrigerant inlet and a refrigerant outlet, the refrigerant inlet and the refrigerant outlet of the second coil are both located outside the shell 66 and are both located on the same side outside the shell 66.

[0044] The compressor 4 is connected to the refrigerant inlet of the second coil and the liquid outlet of the first coil, that is, the outlet of the compressor 4 and the refrigerant inlet of the second coil, the refrigerant outlet of the second coil and the liquid inlet of the first coil, and the liquid outlet of the first coil and the inlet of the compressor 4 are connected through a refrigerant circulation pipeline. An expansion throttle valve 5 is provided on the pipeline connecting the refrigerant outlet of the second coil and the liquid inlet of the first coil. The compressor 4 is used to pressurize the refrigerant so that the refrigerant becomes a high-temperature and high-pressure gas and then enters the second coil through the liquid outlet pipe 42. Heat exchange is performed between the refrigerant vapor and the heat transfer medium, and condensation reduces the temperature of the refrigerant vapor, thereby turning it into a high-pressure liquid refrigerant. The pressure of the high-pressure liquid refrigerant is then reduced through the expansion throttle valve 5 and enters the first coil.

[0045] In this example, the heat transfer medium flows out from the heat transfer medium outlet of the reaction device 11 to the shell 66 of the cooler 6, and the high-temperature and high-pressure refrigerant gas enters the second coil through the liquid outlet pipe 42 to perform heat exchange with the heat transfer medium in the shell 66. The heat transfer medium absorbs the heat released by the high-temperature and high-pressure refrigerant. The heat transfer medium that has absorbed the heat then enters the jacket of the reaction device 11 through the heat transfer medium inlet of the reaction device 11, thereby achieving the goal of heat recovery and reuse; the high-pressure liquid refrigerant coming out of the second coil of the cooler 6 is converted into a low-pressure liquid refrigerant by the expansion throttle valve 5 and enters the first coil in the heat exchanger 1 (the volatile reactants remaining in the reactor enter the collection cylinder of the heat exchanger 1), and the low-pressure refrigerant liquid absorbs the heat from the volatile organic matter remaining in the reactor and causes it to condense, forming a secondary collection, thereby making the collection rate of the volatile reactants (organic matter) of the chemical synthesis reaction device 11 reach more than 99.99%, which not only protects the subsequent operating equipment (such as vacuum pumps, etc.), but also protects the environment. The high-temperature refrigerant (the low-pressure refrigerant liquid becomes the high-temperature refrigerant after absorbing the heat of the volatile organic matter) flowing out from the first coil outlet of the heat exchanger 1 enters the compressor 4 through the liquid inlet pipe 41. The refrigerant can be recycled to realize the recycling of the heat of the compressor 4 system and achieve the effect of energy saving.

[0046] The function of the cooler 6 in this example is as follows: the refrigerant pressurized by the compressor 4 becomes a high-temperature and high-pressure gas and enters the second coil through the liquid outlet pipe 42, and the heat transfer medium enters the shell 66, and heat exchange is carried out in the cooler 6, which is equivalent to preheating the heat transfer medium, so that the high-temperature and high-pressure refrigerant is cooled, achieving the goal of heat recovery and reuse; the cooled refrigerant comes out from the outlet of the second coil and enters the expansion throttle valve 5.

[0047] See also Figure 3 The shell 66 of the cooler 6 in this example is cylindrical and cubic; the second coil includes a tube body 61, a first lead pipe 65, and a second lead pipe 63. The tube body 61 has a first end and a second end. The tube body 61 is located in the shell 66. The first end of the tube body 61 is connected to one end of the first lead pipe 65, and the second end of the tube body 61 is connected to one end of the second lead pipe 63. The other end of the first lead pipe 65 extends to the outside of the shell 66 and is connected to the compressor 4 through the liquid outlet pipe 42. The other end of the second lead pipe 63 extends to the outside of the shell 66 and is connected to the expansion throttle valve 5. The other end of the first lead pipe 65 is the refrigerant inlet, and the other end of the second lead pipe 63 is the refrigerant outlet; the other end of the first lead pipe 65 and the other end of the second lead pipe 63 are both located outside the shell 66 and on the same side outside the shell 66, and the first lead pipe 65 and the second lead pipe 63 are arranged in parallel.

[0048] In some embodiments, the tube body of the first coil and the tube body of the second coil are both spiral-shaped, with high condensation efficiency, and can instantly condense the rapidly flowing volatile organic matter thereon, thereby better ensuring that no volatile gas invades the subsequent vacuum device.

[0049] In some embodiments, the collecting cylinder of the heat exchanger 1 includes an inner cylinder 102, an outer cylinder 101 and a sealing cover, the inner cylinder 102 is arranged in the outer cylinder 101, the interior of the inner cylinder 102 has a accommodating cavity, a thermal insulation interlayer 103 is formed between the inner cylinder 102 and the outer cylinder 101, and the thermal insulation interlayer 103 is formed by vacuuming to form an insulating thermal insulation interlayer 103; the sealing cover is arranged at the top of the inner cylinder 102 and the outer cylinder 101 to seal the collecting cylinder.

[0050] The first coil in this example includes a pipe body 107, a first outlet pipe 108, and a second outlet pipe 109. The pipe body 107 has a first end and a second end. The first end of the pipe body 107 is connected to one end of the first outlet pipe 108, and the second end of the pipe body 107 is connected to one end of the second outlet pipe 109. The other end of the first outlet pipe 108 extends to the outside of the outer cylinder 101 and is connected to the second outlet pipe 63. An expansion throttle valve 5 is provided on the connecting pipeline. The other end of the second outlet pipe 109 extends to the outside of the outer cylinder 101 and is connected to the compressor 4 through the liquid inlet pipe 41. The other end port of the first outlet pipe 108 is a liquid inlet, and the other end port of the second outlet pipe 109 is a liquid outlet.

[0051] The heat exchanger 1 also includes a discharge pipe, one end of which is connected to the inner cylinder 102, and the other end of the discharge pipe passes through the thermal insulation interlayer 103 and the outer cylinder 101 in sequence and extends to the outside of the outer cylinder 101. A discharge valve 106 is arranged at the other end of the discharge pipe, and the discharge valve 106 is used to control the on-off of the discharge pipe. The condensed liquid in the inner cylinder 102 is discharged through the discharge pipe.

[0052] See also Figure 5 The outer cylinder 101 includes a first section and a second section connected to each other. The first section is located on the second section. The first section is cylindrical and the second section is elliptical. The first section and the second section are welded. Two openings are provided at the bottom of the second section. The two openings are used for the first lead-out pipe 108 and the second lead-out pipe 109 to extend out respectively. The two openings are symmetrically arranged about the center of the outer cylinder 101. A circular hole is provided at the center of the bottom of the second section. The circular hole is used for welding and installing the discharge pipe.

[0053] The inner cylinder 102 includes a first cylinder and a second cylinder connected to each other. The first cylinder is located on the second cylinder. The first cylinder is cylindrical and the second cylinder is elliptical. The first cylinder and the second cylinder are welded. Two openings are provided at the bottom of the second cylinder. The two openings are used for the first lead-out pipe 108 and the second lead-out pipe 109 to extend out respectively. The two openings are symmetrically arranged around the center of the inner cylinder 102. A circular hole is provided at the center of the bottom of the second cylinder for welding and installing the discharge pipe.

[0054] See also Figure 5The sealing cover includes a first cover body 104 and a second cover body 105. The first cover body 104 is arranged on the second cover body 105. The first cover body 104 includes a main body, a first protrusion and a second protrusion 110. The first protrusion and the second protrusion 110 are both arranged on the lower side of the main body and extend away from the upper side of the main body. The first protrusion is arranged in the middle of the main body compared to the second protrusion 110. The outer diameter of the main body is larger than the outer diameters of the first protrusion and the second protrusion 110, and the outer diameter of the first protrusion is larger than the outer diameter of the second protrusion 110. A through hole is provided in the middle of the upper side of the main body, which passes through the main body and the first protrusion. The through hole is used to connect a feeding hollow screw 15, which is used to connect the material pipeline from the reaction device 11. Two internal threaded holes (located at symmetrical positions of the radial connection line) are provided on the upper side of the main body to facilitate the connection of the hydraulic lifting device.

[0055] The second cover body 105 is cylindrical, and a positioning circular hole for the first protrusion to be inserted is opened in the middle of the second cover body 105. A groove matching the second protrusion 110 is also opened on the second cover body 105. The first protrusion and the second protrusion 110 are arranged to facilitate positioning and to more quickly install the first cover body 104 and the second cover body 105.

[0056] The heat exchanger 1 also includes a plurality of support columns for supporting the collection tube, the support columns are round tubes or square tubes, the upper ends of the support columns are welded to the second cover 105, and the lower ends of the support columns are against the ground. Furthermore, a reinforcement is provided between two adjacent support columns, and the reinforcement can be a round tube or a square tube to enhance the support for the collection tube. A support plate can be welded to the lower end of the support column, and the support plate is square or round.

[0057] In some embodiments, the system further includes a heat transfer medium intermediate tank 9, which is connected to the heat transfer medium inlet and shell outlet of the reaction device 11. The heat transfer medium can be buffered in the heat transfer medium intermediate tank 9, and whether to transport the heat transfer medium to the jacket outside the reactor can be selected according to the temperature in the reactor.

[0058] See also Figure 1-2 The heat transfer medium intermediate tank 9 includes a tank body 94, an upper head 95 and a lower head 96. The tank body 94 is cylindrical. The upper head 95 and the lower head 96 are respectively arranged at the upper end and the lower end of the tank body 94. The cross-sections of the upper head 95 and the lower head 96 are both elliptical. A discharge pipe connected to the tank body 94 is arranged on the lower side of the lower head 96. A discharge valve 91 is arranged on the discharge pipe, and the heat transfer medium in the tank body 94 can flow out through the discharge valve 91; a second flange pipe 92 connected to the jacket of the chemical synthesis reaction device 11 is arranged outside one side of the tank body 94, and a third flange pipe 93 connected to the control valve 8 is arranged outside the upper head 95.

[0059] In some embodiments, the system further includes a heat transfer medium circulation pump 7, which is disposed in a pipeline connecting the heat transfer medium outlet of the reaction device 11 and the shell inlet, and the function of the heat transfer medium circulation pump 7 is to pump the heat transfer medium in the chemical synthesis reaction device 11 into the cooler 6 for heat exchange and heat recovery. The cooler 6 and the heat transfer medium circulation pump 7 are connected through a fourth flange pipe 62.

[0060] In some embodiments, a control valve 8 is provided on the pipeline connecting the heat transfer medium intermediate tank 9 and the shell outlet, and the function of the control valve 8 is to control the flow rate of the heat transfer medium flowing out of the shell into the heat transfer medium intermediate tank 9 to ensure the cooling effect of the refrigerant. The cooler 6 and the control valve 8 are connected through a fifth flange pipe 64.

[0061] The device of this example further includes a sixth flange pipe 111 connected to the heat transfer medium circulation pump 7 , a seventh flange pipe 112 connected to the heat exchanger 1 , and an eighth flange pipe 113 connected to the heat transfer medium intermediate tank 9 .

[0062] The vacuum device is connected to the heat exchanger 1, see Figure 1-2 The vacuum device includes a vacuum buffer tank 2 and a vacuum pump 3. The vacuum buffer tank 2 is connected to the heat exchanger 1, and the vacuum pump 3 is connected to the vacuum buffer tank 2. The vacuum buffer tank 2 includes a tank body, a first end cap and a second end cap. The tank body is cylindrical. The first end cap and the second end cap are respectively arranged at the upper end and the lower end of the tank body. The cross-sections of the first end cap and the second end cap are both elliptical. A vacuum pressure gauge 21 is arranged on the first end cap. A first flange pipe 23 with a valve is also arranged on the first end cap. The first end cap is connected to the three-way valve 14 through a pipeline 24. A discharge pipe is arranged on the second end cap, and a discharge valve 22 is arranged on the discharge pipe.

[0063] In some embodiments, the system also includes a connecting pipe 12 and a vent pipe 13, one end of the connecting pipe 12 is connected to the shell, the other end of the connecting pipe 12 and one end of the vent pipe 13 are connected to the vacuum buffer tank 2 through a three-way valve 14, and the other end of the vent pipe 13 is connected to the atmosphere. The function of the connecting pipe 12 is to close, connect with the vacuum system or vent; the function of the vent pipe 13 is to vent.

[0064] In some embodiments, the vacuum pump 3 is connected to the vacuum buffer tank 2 via a connecting pipe 31, and the system further includes an exhaust pipe 32, one end of the exhaust pipe 32 is connected to the vacuum pump 3, and the other end of the exhaust pipe 32 is connected to the atmosphere.

[0065] The circulating high-efficiency condensation reaction system of this example has the advantages of heat recovery and reuse, ultra-low temperature rapid condensation of volatiles and effective protection of vacuum devices.

[0066] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A circulating condensation system, characterized in that: It includes a reaction device, a heat exchanger, a cooler, a compressor, and a vacuum device. The reaction device has a reactant outlet, a heat transfer medium inlet, and a heat transfer medium outlet; The heat exchanger comprises a collecting tube, a first coil is arranged in the collecting tube, the first coil has a liquid inlet and a liquid outlet, and the inlet of the collecting tube of the heat exchanger is connected to the reactant outlet of the reaction device; The cooler comprises a shell, a second coil is arranged in the shell, the second coil has a refrigerant inlet and a refrigerant outlet, the shell inlet is connected to the heat transfer medium outlet of the reaction device, and the shell outlet is connected to the heat transfer medium inlet of the reaction device; The outlet of the compressor and the refrigerant inlet of the second coil, the refrigerant outlet of the second coil and the liquid inlet of the first coil, and the liquid outlet of the first coil and the inlet of the compressor are connected through a refrigerant circulation pipeline; An expansion throttle valve is provided on the pipeline connecting the refrigerant outlet of the second coil and the liquid inlet of the first coil; The vacuum device is communicated with the heat exchanger.

2. The circulating condensation system according to claim 1, characterized in that: The refrigerant inlet and the refrigerant outlet of the second coil are both located outside the shell and on the same side outside the shell.

3. The circulating condensation system according to claim 1, characterized in that: The liquid inlet and the liquid outlet of the first coil are both located below the collecting tube.

4. The circulating condensation system according to claim 1, characterized in that: The first coil and the second coil are both in a spiral shape.

5. The circulating condensation system according to claim 1, characterized in that: The system further comprises a heat transfer medium intermediate tank, which is connected with the heat transfer medium inlet and the shell outlet of the reaction device.

6. The circulating condensation system according to claim 5, characterized in that: A control valve is arranged on the pipeline connecting the heat transfer medium intermediate tank and the shell outlet.

7. The circulating condensation system according to claim 5, characterized in that: The heat transfer medium intermediate tank includes a tank body, an upper head and a lower head, the upper head and the lower head are respectively arranged at the upper end and the lower end of the tank body, the tank body is cylindrical, the cross-sections of the upper head and the lower head are both elliptical, and the lower side of the lower head is provided with a discharge pipe connected to the tank body, and a discharge valve is provided on the discharge pipe.

8. The circulating condensation system according to claim 1, characterized in that: The system further comprises a heat transfer medium circulation pump, which is arranged on a pipeline connecting the heat transfer medium outlet of the reaction device and the shell inlet.

9. The circulating condensation system according to claim 1, characterized in that: The second coil includes a pipe body, a first lead pipe, and a second lead pipe. The pipe body has a first end and a second end. The first end of the pipe body is connected to one end of the first lead pipe, and the second end of the pipe body is connected to one end of the second lead pipe. The other end of the first lead pipe extends to the outside of the shell and is connected to the compressor, and the other end of the second lead pipe extends to the outside of the shell and is connected to the expansion throttle valve.

10. The circulating condensation system according to claim 1, characterized in that: The vacuum device comprises a vacuum buffer tank and a vacuum pump. The vacuum buffer tank is communicated with the heat exchanger, and the vacuum pump is communicated with the vacuum buffer tank.

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