Heat pipe type coil heat exchanger

Abstract

The application discloses a heat pipe type coiled tube heat exchanger. The heat exchanger is provided with an intermediate medium circulation system and a pressure control system, so that the cold and hot flows are completely separated for heat transfer; meanwhile, the structure of the coiled tube bundle and the internal circulation ensures the compact structure and the heat exchange efficiency of the heat exchanger; the tube bundle hanger elastically suspends the coiled tube bundle on the tube bundle hanger support frame, so that the stress influence caused by the thermal expansion and cold contraction of the tube bundle is eliminated. The heat exchanger eliminates the risk of medium pollution and has high heat exchange efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of heat transfer, and relates to a heat-pipe type coil heat exchanger. BACKGROUND

[0002] A heat pipe is a heat transfer component with high heat conduction performance. The heat pipe transfers heat through evaporation and condensation of a working medium in a fully-closed vacuum pipe shell. The working medium in the evaporation section of the heat pipe is heated to boil or evaporate, absorbs heat of an external heat source, generates latent heat of vaporization, changes from liquid to vapor, and the generated vapor flows to the condensation section under the action of a certain pressure difference in the pipe. The vapor condenses into liquid when meeting a cold wall surface and an external cold source, and releases the latent heat of vaporization, which is transferred to the external cold source through the pipe wall. The condensate returns to the evaporation section under the action of gravity (or wick) to evaporate again. The above process is repeated to realize heat transfer and exchange between the external cold and hot media. The heat exchanger with the heat pipe as the heat transfer component has the advantages of high heat transfer efficiency, compact structure, small fluid resistance, and being conducive to controlling dew point corrosion. The heat exchanger has been widely applied in the industries of metallurgy, chemical industry, oil refining, boiler, ceramics, transportation, light textile, and machinery, as an energy-saving device for waste heat recovery and heat energy utilization in a process, and has achieved remarkable economic benefits.

[0003] CN101702871A discloses a semi-inserted heat pipe heat exchanger explosion-proof box. The explosion-proof box comprises an explosion-proof box body, a heat pipe heat exchanger, an intermediate partition plate, and an internal heat source of the explosion-proof box body. The heat pipe heat exchanger mainly comprises heat pipes arranged in an array and penetrating through the stacked heat dissipation fins provided with the intermediate partition plate. An open flange is arranged on the upper surface of the explosion-proof box body. The heat receiving section of the heat pipe heat exchanger is arranged in the explosion-proof box body and located at the lower end of the intermediate partition plate. The cooling section of the heat pipe heat exchanger is arranged outside the explosion-proof box body and located at the upper end of the intermediate partition plate. The intermediate partition plate is fixed to the open flange by bolts. Compared with the prior art, the semi-inserted heat pipe heat exchanger is adopted, cold and hot fluids can be quickly exchanged through the cooling section and the heat receiving section of the heat pipe heat exchanger, effective explosion-proof and good heat dissipation are achieved, the structure is simple, installation is convenient, and the heat pipe heat exchanger can be widely applied to heat dissipation of various explosion-proof boxes.

[0004] The above technical solution has the following disadvantages: the heat pipe heat exchanger has high cost, is difficult to replace when damaged during use, the selection of the medium in the heat pipe heat exchanger is strict and harsh, and the available medium is limited. In many chemical applications, the contamination of the process materials caused by the damaged heat pipe is unacceptable, so the use of the heat pipe heat exchanger is greatly limited.

[0005] The spiral wound heat exchanger refers to a kind of heat exchanger in which multiple layers of spiral heat exchange pipes are arranged in core cylinder and outer cylinder to form spiral pipe bundle (the spiral directions of adjacent two layers of spiral heat exchange pipes are opposite and a certain spacing is kept). The heat exchange efficiency of this kind of spiral wound heat exchanger is 5-7 times of that of traditional column tube heat exchanger, the volume is smaller, and the installation is more convenient, and it is widely used in medium heat exchange in chemical industry, food, medicine and other fields.

[0006] CN104896973A discloses a double-tube spiral wound tube heat exchanger and a heat exchange method thereof. The heat exchanger comprises a shell side cylinder, a left tube box and a right tube box. The upper part of the shell side cylinder is provided with shell side connecting pipes on both sides. The left tube plate and the slotted right tube plate are arranged at both ends of the shell side cylinder. The spiral wound tube bundle is fixedly arranged between the left tube plate and the slotted right tube plate, and is connected with the left tube box and the right tube box at both ends. A partition plate is arranged in the right tube box to divide the inner cavity into upper and lower cavities. The partition plate is sealingly connected with the partition plate slot on the slotted right tube plate. The upper part of the right tube box is provided with a tube side upper connecting pipe, and the lower part of the right tube box is provided with a tube side lower connecting pipe. The heat exchanger is suitable for occasions where the installation site of the user is limited, the tube side inlet and outlet positions are required to be arranged on the same side, or the tube side flow process needs to be lengthened. The double-tube spiral wound tube heat exchanger can improve the heat exchange efficiency, save energy, reduce consumption, and facilitate operation and maintenance. The disadvantage of the above technical solution is that the traditional spiral wound tube heat exchanger cannot ensure that the cold and hot flows do not mix. SUMMARY

[0007] The technical problem to be solved by the present application is to provide a heat pipe type spiral wound heat exchanger which can completely prevent the cold and hot flows from mixing, has no pollution risk to process medium, and has high heat exchange efficiency.

[0008] A heat pipe type spiral wound heat exchanger, which is a vertical structure, comprises a shell, an upper large head, a lower large head and a center cylinder located in the middle of the shell. The shell is connected with the upper large head and the lower large head through flanges respectively.

[0009] The center cylinder is wound with a heat exchange pipe bundle. The heat exchange pipe bundle comprises a hot flow heat exchange pipe and a cold flow heat exchange pipe sleeved inside the hot flow heat exchange pipe. The shell side of the shell is used for hot flow circulation, and the hot flow directly contacts the hot flow heat exchange pipe. The inside of the cold flow heat exchange pipe is used for cold flow circulation, and the cold flow directly contacts the cold flow heat exchange pipe. The cold flow circulation passage forms a tube side of the heat exchanger. The annular passage between the hot flow heat exchange pipe and the cold flow heat exchange pipe constitutes an intermediate medium passage. The working pressure of the intermediate medium passage is higher than that of the hot flow passage and the cold flow passage.

[0010] Further, the shell side of the shell has a hot flow inlet and a hot flow outlet.

[0011] Further, the intermediate medium channel between the hot flow heat exchange pipe and the cold flow heat exchange pipe and the center cylinder constitute an intermediate medium circulation channel (system).

[0012] Further, a cold flow lower tube plate is arranged at the lower part of the lower large head, and a cold flow lower tube box is formed in the space below the cold flow lower tube plate, and a cold flow inlet is arranged in the cold flow lower tube box. The cold flow lower tube plate connects the cold flow heat exchange pipe and the cold flow lower tube box.

[0013] Further, an intermediate medium lower tube plate is arranged at the position above the cold flow tube plate and at the lower part of the center cylinder in the lower large head, and an intermediate medium tube box is formed between the intermediate medium lower tube plate and the cold flow lower tube plate.

[0014] Further, the lower end of the center cylinder is connected with the intermediate medium lower tube plate, and the lower end extension of the center cylinder extends downward into the intermediate medium lower tube box. A circulation pump is arranged at the end of the lower end extension of the center cylinder, which is used to pump the intermediate medium flowing down from the intermediate medium channel into the intermediate cylinder.

[0015] Further, a cold flow upper tube plate is arranged at the upper part of the upper large head, and a cold flow upper tube box is formed in the space above the cold flow upper tube plate, and the cold flow upper tube box has a cold flow outlet. The cold flow upper tube plate connects the cold flow tube and the cold flow upper tube box.

[0016] Further, an intermediate medium upper tube plate is arranged at the position below the cold flow upper tube plate and close to the upper end of the intermediate cylinder in the upper large head, and an intermediate medium upper tube box is formed between the intermediate medium upper tube plate and the cold flow upper tube plate.

[0017] Further, a pressure control system is arranged at one side of the intermediate medium upper tube box. The pressure control system comprises a pressure charging adjusting valve, a pressure sensor and an exhaust adjusting valve. A liquid level sensor and a liquid supplementing and discharging valve are arranged at the other side of the intermediate medium upper tube box, which are used to adjust the liquid level of the intermediate medium in the heat exchanger.

[0018] The pressure sensor measures the gas phase pressure in the intermediate upper tube box, and opens and closes the exhaust adjusting valve and the pressure charging adjusting valve. When the pressure is high, the exhaust adjusting valve is opened to discharge gas, and when the pressure is low, the pressure charging adjusting valve is opened to charge gas, so as to maintain the pressure of the intermediate circulation system stable and constant. The liquid level sensor measures the liquid level of the intermediate medium in the cylinder, so as to control the opening and closing of the liquid supplementing and discharging adjusting valve, thereby maintaining the liquid level.

[0019] Further, the pressure charging adjusting valve generally charges inert gas, and the preferred inert gas is nitrogen.

[0020] Further, a driving device (driving machine) is further included, which is used to drive the circulation pump to work.

[0021] Further, a wave reducing plate is arranged in the intermediate medium upper tube box, which is used to reduce the upward impact force of the intermediate medium.

[0022] In the present application, the intermediate medium circulation system is arranged, the heat flow is first exchanged with the heat flow through the intermediate circulation, and the heat flow heat is transferred to the cold flow, and then the cold flow is cooled and returned to the inlet circulation. The pressure gradient control is arranged, the intermediate circulation medium pressure is high, and the cold flow and the heat flow medium pressure is low. The present application has no special requirements for the circulation medium, and the same medium as the heat flow or the relative process system risk-free medium can be used.

[0023] Further, the center tube is lined with a heat-insulating inner sleeve.

[0024] Further, the heat flow enters the heat exchanger, and the heat is transferred to the intermediate medium through the heat flow heat exchange pipe in the shell side of the heat exchanger. The intermediate medium is heated and transferred to the cold flow through the cold flow heat exchange pipe in the heat flow heat exchange pipe.

[0025] Further, the heat exchanger of the present application further comprises a hanging system. The hanging system comprises a tube bundle hanger support ring which can be placed between the large flanges of the heat exchanger, a tube bundle hanger support frame connected with the tube bundle hanger support ring, a center tube connected with the tube bundle hanger support frame, and a tube bundle support strip connected with the support frame.

[0026] Further, the tube bundle support strip can be chain type or hanging rack type. The tube bundle support strip is hung on the tube bundle support strip through the tube bundle hanger bolt.

[0027] Compared with the prior art, the heat exchanger of the present application has the following advantages:

[0028] By arranging the center tube as the intermediate medium channel and sleeving the cold flow heat exchange pipe inside the heat flow heat exchange pipe, and combining the circulating pump arranged at the end of the center tube extension section in the intermediate medium lower tube box, the intermediate medium circulation channel is formed inside the heat exchanger. The establishment of the intermediate medium circulation channel realizes the purpose of transferring the heat flow heat to the cold flow after the intermediate medium extracts the heat flow heat inside the heat exchanger. Through the pressure control system arranged in the intermediate medium upper tube box, the working pressure of the intermediate medium in the intermediate medium channel can be ensured to be higher than the pressure of the cold flow and the heat flow, thereby ensuring that the cold flow and the heat flow medium will not be mixed. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a schematic diagram of the heat pipe type spiral wound heat exchanger.

[0030] Figure 2 It is a schematic diagram of the hanging system.

[0031] Figure 3 It is a schematic diagram of the heat exchange system tube bundle winding.

[0032] Figure 4 It is a structural schematic diagram of the intermediate medium lower tube box.

[0033] Figure 5This is a schematic diagram of the structure of the intermediate medium upper pipe box.

[0034] In the diagram, the component names corresponding to the numbers are as follows: 1-Hot flow inlet, 2-Heat exchanger shell, 3-Cold flow heat exchange tube, 4-Shell side inlet / outlet flange, 5-Hot flow outlet, 6-Lower large flange, 7-Lower large head, 8-Circulating pump, 9-Drive motor, 10-Cold flow inlet, 11-Hot flow heat exchange tube, 12-Cold flow outlet, 13-Cold flow heat exchange tube extension, 14-Upper large flange, 15-Upper large head, 16-Surge damper, 17-Exhaust regulating valve, 18-Pressure sensor, 19-Pressure regulating valve, 20-Liquid... 21-Liquid level, 22-Replenish / drain valve, 23-Tube bundle hanger support frame, 24-Central cylinder, 25-Cold flow upper tube box, 26-Cold flow upper tube sheet, 27-Intermediate medium upper tube sheet, 28-Intermediate medium lower tube sheet, 29-Cold flow lower tube sheet, 30-Cold flow lower tube box, 31-Intermediate medium lower tube box, 32-Intermediate medium upper tube box, 33-Lower extension section of central cylinder, 34-Hanger support ring, 35-Tube bundle hanger bolt, 36-Tube bundle support strip, 37-Insulating inner sleeve, 38-Intermediate circulating medium. Detailed Implementation

[0035] The heat exchanger of the present invention will now be described in more detail with reference to the accompanying drawings.

[0036] like Figure 1 As shown, the heat pipe wound tube heat exchanger of the present invention has a vertical structure, including a shell 2, an upper large head 15, a lower large head 7, and a central cylinder 24 located in the middle of the shell; the shell is connected to the upper and lower large heads by an upper large flange 14 and a lower large flange 6, respectively; a heat exchange tube bundle is wound around the outside of the central cylinder, the heat exchange tube bundle including a hot flow heat exchange tube 11 and a cold flow heat exchange tube 3 fitted inside the hot flow heat exchange tube; the shell side of the shell is used for hot flow, and the hot flow is in direct contact with the hot flow heat exchange tube, the inside of the cold flow heat exchange tube is used for cold flow, and the cold flow is in direct contact with the cold flow heat exchange tube, the cold flow channel forms the tube side of the heat exchanger, and the annular channel between the hot flow heat exchange tube 11 and the cold flow heat exchange tube 3 constitutes the intermediate medium channel; wherein, the working pressure of the intermediate medium channel is higher than the working pressure of the shell side hot flow channel and cold flow channel.

[0037] The shell side of the shell 2 has a hot flow inlet 1 and a hot flow outlet 5. The intermediate medium channel between the hot flow heat exchange tube 11 and the cold flow heat exchange tube 3 and the central cylinder 24 constitute the intermediate medium circulation channel.

[0038] A cold flow lower tube sheet 29 is installed at the lower part of the lower large head. The space below the cold flow lower tube sheet forms a cold flow lower tube box 30, which is equipped with a cold flow inlet 10. The cold flow lower tube sheet connects the cold flow heat exchange tube 3 and the cold flow lower tube box 30. An intermediate medium lower tube sheet 28 is installed inside the lower large head, above the cold flow tube sheet and near the lower part of the lower central cylinder. The intermediate medium lower tube sheet 28 and the cold flow lower tube sheet 29 form an intermediate medium lower tube box. The lower extension section 33 of the central cylinder extends downward into the lower large head. A circulation pump 8 is installed at the end of the lower extension section of the central cylinder.

[0039] A cold flow upper tube sheet 26 is installed on the upper part of the upper large head. The space above the cold flow upper tube sheet forms a cold flow upper tube box 25, which has a cold flow outlet 12. A wave damping plate 16 is installed inside the intermediate medium upper tube box to reduce the upward impact force of the intermediate medium. The cold flow upper tube sheet connects the cold flow pipe 3 and the cold flow upper tube box 25. An intermediate medium upper tube sheet 27 is installed inside the upper large head, below the cold flow upper tube sheet and near the upper extension of the intermediate cylinder. The intermediate medium upper tube sheet 27 and the cold flow upper pipe 26 form an intermediate medium upper tube box.

[0040] A pressure control system is installed on one side of the intermediate medium upper tank. The pressure control system includes a pressurization regulating valve 19, a pressure sensor 18, and a venting regulating valve 17. A liquid level sensor 21 and a replenishment / drainage valve 22 are installed on the other side of the intermediate medium upper tank.

[0041] Pressure sensor 18 measures the gas phase pressure inside the intermediate medium's upper pipe tank, and switches the exhaust regulating valve 17 and the pressurization regulating valve 19 accordingly. When the pressure is high, the exhaust regulating valve opens to release gas; when the pressure is low, the pressurization regulating valve opens to pressurize, thus maintaining the pressure stability and maintenance of the intermediate circulation system. Liquid level sensor 20 measures the liquid level in the intermediate medium's pressure-maintaining cylinder, thereby controlling the opening and closing of the replenishment / drainage regulating valve 22 to maintain a proper liquid level.

[0042] The drive unit (drive motor) 9 is located outside the housing and is used to drive the circulating pump 8. The interior of the central cylinder is lined with an insulating inner sleeve.

[0043] like Figures 1-3 As shown in the schematic diagram of the hanger system, the hanger system has a tube bundle hanger support frame 23 at the top, and tube bundle hanger bolts 35 are connected to the tube bundle hanger support frame 23. The tube bundle hanger bolts 35 are connected to tube bundle support bars 36. The tube bundle is suspended on the tube bundle support bars 36 and can extend and retract freely.

[0044] like Figure 3As shown in the heat exchange system pipe bundle winding schematic diagram, the cold flow heat exchange pipe 3 is inserted into the inside of the hot flow heat exchange pipe 11, and the hot flow heat exchange pipe 11 and the cold flow heat exchange pipe 3 form an intermediate medium heat exchange channel. The cold flow heat exchange pipe 3 is spirally wound in the composite heat transfer pipe formed by the hot flow heat exchange pipe 11, and the winding directions of the spirally wound composite pipes between adjacent two layers are opposite, forming an interlaced structure.

[0045] As shown in the heat exchange system pipe bundle winding schematic diagram, the cold flow heat exchange pipe 3 is inserted into the inside of the hot flow heat exchange pipe 11, and the hot flow heat exchange pipe 11 and the cold flow heat exchange pipe 3 form an intermediate medium heat exchange channel. The cold flow heat exchange pipe 3 is spirally wound in the composite heat transfer pipe formed by the hot flow heat exchange pipe 11, and the winding directions of the spirally wound composite pipes between adjacent two layers are opposite, forming an interlaced structure. Figure 4 As shown in the heat exchange system pipe bundle winding schematic diagram, the cold flow heat exchange pipe 3 is inserted into the inside of the hot flow heat exchange pipe 11, and the hot flow heat exchange pipe 11 and the cold flow heat exchange pipe 3 form an intermediate medium heat exchange channel. The cold flow heat exchange pipe 3 is spirally wound in the composite heat transfer pipe formed by the hot flow heat exchange pipe 11, and the winding directions of the spirally wound composite pipes between adjacent two layers are opposite, forming an interlaced structure.

[0046] As shown in the heat exchange system pipe bundle winding schematic diagram, the cold flow heat exchange pipe 3 is inserted into the inside of the hot flow heat exchange pipe 11, and the hot flow heat exchange pipe 11 and the cold flow heat exchange pipe 3 form an intermediate medium heat exchange channel. The cold flow heat exchange pipe 3 is spirally wound in the composite heat transfer pipe formed by the hot flow heat exchange pipe 11, and the winding directions of the spirally wound composite pipes between adjacent two layers are opposite, forming an interlaced structure. Figure 5 As shown in the heat exchange system pipe bundle winding schematic diagram, the cold flow heat exchange pipe 3 is inserted into the inside of the hot flow heat exchange pipe 11, and the hot flow heat exchange pipe 11 and the cold flow heat exchange pipe 3 form an intermediate medium heat exchange channel. The cold flow heat exchange pipe 3 is spirally wound in the composite heat transfer pipe formed by the hot flow heat exchange pipe 11, and the winding directions of the spirally wound composite pipes between adjacent two layers are opposite, forming an interlaced structure.

[0047] Example 1

[0048] The present application will be described below in combination with waste heat recovery of a refinery heat medium water system.

[0049] The refinery heat medium water system recovers low-temperature waste heat of various process streams through heat medium water, but some process waste heat, such as overhead stream of a toluene column in an aromatic hydrocarbon device, overhead stream of a raffinate column, etc., cannot be directly taken by heat medium water because the subsequent process catalysts are prone to water poisoning. The overhead waste heat recovery of a raffinate column in an aromatic hydrocarbon xylene device will be described as an example.

[0050] The process stream from the top of the column 141℃, 30KPa, enters the hot stream inlet 1 into the hot stream heat exchange tube 11 for heat exchange. The 65℃, 0.6MPa hot medium water has a cold stream inlet 10 into the cold stream heat exchange tube 3 for heat exchange, the circulating medium 90℃, 1.2MPa is pressurized to about 1.25MPa by the circulating pump 8 into the center cylinder 24, from the center cylinder 24 into the intermediate medium pressure maintaining cylinder 32, through the intermediate medium pressure maintaining cylinder 32, passes through the intermediate medium upper tube plate 27 into the intermediate medium heat exchange passage between the hot stream heat exchange tube 11 and the cold stream heat exchange tube 3, the hot stream finally passes through the intermediate medium heat exchange passage between the hot stream heat exchange tube 11 and the cold stream heat exchange tube 3 and passes through the intermediate medium lower tube plate 28 into the intermediate medium circulating cylinder 31. The hot stream enters the heat exchanger shell side through the hot stream inlet 1, flows downward in the shell side, exchanges heat with the intermediate circulating medium 38 in the hot stream heat exchange tube 11, and the hot stream is cooled to 127℃ when it exits the heat exchanger through the hot stream outlet 5, the intermediate circulating medium 38 is heated to about 130.2℃, the intermediate circulating medium 38 passes through the cold stream heat exchange tube 11 to heat the hot medium water, and the hot medium water is heated to 120℃ and exits the heat exchanger through the cold stream outlet 12. The circulating medium 38 is finally cooled to 90℃ by the hot medium water and enters the intermediate medium circulating cylinder 31, enters the center cylinder 24 through the circulating pump 8, and is recirculated. The pressure of the circulating medium 38 is adjusted by the pressure sensor 18 and the pressure adjusting valve 19 and the exhaust adjusting valve 17, and the pressure is maintained at 1.2MPa.

[0051] The detachable heat pipe type coil heat exchanger of the present application realizes complete separation of the cold and hot streams by setting the intermediate circulation and pressure control system, and at the same time, the structure of the coil bundle and the internal circulation ensures the compact structure of the heat exchanger and the heat exchange efficiency. The coil bundle hanger elastically suspends the coil bundle on the coil bundle hanger support frame, eliminating the stress influence caused by thermal expansion and cold contraction of the coil bundle. The heat exchanger can ensure that the cold and hot streams do not mix.

Claims

1. A heat pipe type coil heat exchanger which is a vertical structure, characterized by, The heat exchanger comprises a shell, an upper large head, a lower large head and a central cylinder located in the middle of the shell. The shell is connected with the upper large head and the lower large head through flanges respectively. The outer part of the central cylinder is wound with a heat exchange tube bundle, which comprises a hot flow heat exchange tube and a cold flow heat exchange tube sleeved in the hot flow heat exchange tube. The shell side is used for hot flow circulation, and the inside of the cold flow heat exchange tube is used for cold flow circulation, and the cold flow circulation channel forms a heat exchanger tube side. The annular channel between the hot flow heat exchange tube and the cold flow heat exchange tube constitutes an intermediate medium channel, and the intermediate medium channel and the central cylinder constitute an intermediate medium circulation channel. The working pressure of the intermediate medium channel is higher than that of the hot flow circulation channel and the cold flow circulation channel.

2. The coiled tube heat exchanger of claim 1, wherein, The shell side has a hot flow inlet and a hot flow outlet.

3. The coiled tube heat exchanger of claim 1, wherein, A cold flow lower tube plate is arranged at the lower part of the lower large head, and the space below the cold flow lower tube plate constitutes a cold flow lower tube box, which is provided with a cold flow inlet.

4. The coiled tube heat exchanger of claim 1, wherein, An intermediate medium lower tube plate is arranged at the lower part of the central cylinder above the cold flow tube plate in the lower large head, and an intermediate medium tube box is formed between the intermediate medium lower tube plate and the cold flow lower tube plate.

5. The coiled tube heat exchanger of claim 1, wherein, The lower end of the central cylinder is connected with the intermediate medium lower tube plate, and the lower end extension of the central cylinder extends downward into the intermediate medium lower tube box.

6. The coiled tube heat exchanger of claim 1, wherein, A circulating pump is arranged at the end of the lower end extension of the central cylinder, which is used for pumping the intermediate medium flowing out of the intermediate medium channel into the intermediate cylinder.

7. The coiled tube heat exchanger of claim 1, wherein A cold flow upper tube plate is arranged at the upper part of the upper large head, and the space above the cold flow upper tube plate constitutes a cold flow upper tube box, which has a cold flow outlet.

8. The coiled tube heat exchanger of claim 1, wherein, An intermediate medium upper tube plate is arranged at the position close to the upper end of the intermediate cylinder below the cold flow upper tube plate in the upper large head, and an intermediate medium upper tube box is formed between the intermediate medium upper tube plate and the cold flow upper tube plate.

9. The coiled tube heat exchanger of claim 8, wherein, A pressure control system is arranged on one side of the intermediate medium upper tube box, which comprises a pressure charging adjusting valve, a pressure sensor and an exhaust adjusting valve.

10. The coiled tube heat exchanger of claim 8, wherein, A liquid level sensor and a liquid supplementing valve are arranged on the other side of the intermediate medium upper tube box, which are used for adjusting the liquid level of the intermediate medium in the heat exchanger.

11. The coiled tube heat exchanger of claim 6, wherein, A driving device is further arranged, which is used for driving the circulating pump to work.

12. The coiled tube heat exchanger of claim 8, wherein, A wave reduction plate is arranged in the intermediate medium upper tube box, which is used for reducing the upward impact force of the intermediate medium.

13. The coiled tube heat exchanger of claim 1, wherein, An adiabatic inner sleeve is lined in the inner part of the central cylinder.

14. The coiled tube heat exchanger of claim 1, wherein, A hanging system is further arranged, which comprises a tube bundle hanging support ring that can be placed between the upper large flanges of the heat exchanger, a tube bundle hanging support frame connected with the tube bundle hanging support ring, a central cylinder connected with the tube bundle hanging support frame, and a tube bundle support strip connected with the support frame.

15. The coiled tube heat exchanger of claim 14, wherein, The tube bundle support strip is chain type or hanger type, and the tube bundle support strip is hung on the tube bundle support strip through tube bundle hanging bolts.

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