Drainage waste heat recycling system

Abstract

The utility model relates to a drainage waste heat recycling system, and belongs to the technical field of drainage waste heat recycling. The drainage waste heat recycling system comprises a drainage flash tank, a drainage input pipeline is arranged at an inlet of the drainage flash tank, a steam exhaust pipeline and a drainage pipeline are arranged at an outlet of the drainage flash tank, and a water jet air extractor communicates with the drainage flash tank through the steam exhaust pipeline; the heat exchanger is communicated with the drain flash tank through the drain pipeline so that steam and non-condensable gas in the drain flash tank can be pumped out, negative pressure can be formed in the drain flash tank, drain water can be generated, and the heat exchanger is communicated with the drain flash tank through the drain pipeline so that the drain water generated by the drain flash tank can exchange heat with unit condensation water. And the heat exchanger is communicated with the water jetting and air extracting device through a circulating pipeline, so that drained water after heat exchange is introduced into the water jetting and air extracting device and provides power for the water jetting and air extracting device.

Description

Technical Field

[0001] This application relates to the field of hydrophobic waste heat recovery and utilization technology, and in particular to a hydrophobic waste heat recovery and utilization system. Background Technology

[0002] In steam systems, "condensate drainage" refers to the removal of condensate generated in the system through specific devices. The main purpose of condensate drainage is to ensure the efficient operation of the steam system and prevent equipment damage.

[0003] To keep the boiler's heating surfaces clean, coal-fired boilers are often equipped with steam soot blowers. Since water carried by the soot blowers can easily damage the heating surfaces, a large amount of condensate is needed during soot blowing to ensure that the soot blowing steam has sufficient superheat. In addition, coal-fired power plants in my country have generally installed NH3-based SCR flue gas denitrification devices. The reducing agent of the SCR flue gas denitrification device is mainly ammonia. Ammonia is usually prepared by liquid ammonia evaporation, ammonia water evaporation, urea hydrolysis, urea pyrolysis, etc. Among them, the urea hydrolysis system and the heat tracing of the ammonia supply pipeline for denitrification of the unit both use steam as the heat source. The steam transportation process and the condensation after heat exchange can also generate a large amount of condensate.

[0004] Most of the hydrophobic water generated in the above process has a certain temperature. High-temperature hydrophobic water will be directly discharged into the unit's drainage tank, the fixed discharge expansion container, or directly into the wastewater recycling pipeline, and finally discharged into the wastewater treatment system for treatment. In the application of urea hydrolysis technology, the recycling and utilization of hydrophobic water has not been considered, resulting in the waste of resources and energy. Utility Model Content

[0005] This application provides a hydrophobic waste heat recovery and utilization system, which can solve the problem that existing hydrophobic materials are generally directly discharged, resulting in low energy utilization efficiency of hydrophobic materials.

[0006] The technical solution of this application is as follows: A hydrophobic waste heat recovery and utilization system, comprising:

[0007] A hydrophobic expansion container, wherein the inlet of the hydrophobic expansion container is provided with a hydrophobic input pipe, and the outlet of the hydrophobic expansion container is provided with a steam exhaust pipe and a drainage pipe;

[0008] A water jetting and air extraction device is connected to a hydrophobic expansion container via a steam exhaust pipe to extract steam and non-condensable gases from inside the hydrophobic expansion container, thereby creating a negative pressure inside the hydrophobic expansion container and generating hydrophobicity.

[0009] The heat exchanger is connected to the condensate expansion container through the drain pipe, so that the condensate generated by the condensate expansion container exchanges heat with the condensate of the unit. The heat exchanger is connected to the water jet exhaust device through the circulation pipe, so that the condensate after heat exchange is introduced into the water jet exhaust device and provides power to the water jet exhaust device.

[0010] By adopting the above scheme, the steam and non-condensable gas in the drain expansion vessel are extracted by the water jet air extraction device, so that a negative pressure is formed in the drain expansion vessel, and then the high-temperature and high-pressure unit drain entering the drain expansion vessel is subjected to flash evaporation under the negative pressure to form high-temperature steam and drain, which is subjected to heat exchange with the unit condensate in the heat exchanger, so that the heat energy of the unit drain is fully utilized, and in addition, part of the heat-exchanged drain is circulated into the water jet air extraction device after being pressurized to provide power for the water jet air extraction device, and the other part is recovered to the unit condenser.

[0011] In one of the embodiments of the present application, the drain input pipeline comprises a boiler steam soot blowing drain pipeline, a urea hydrolysis heat exchanger drain pipeline and a unit denitration ammonia supply pipeline heat tracing drain pipeline, water inlet electric valves are arranged on the boiler steam soot blowing drain pipeline, the urea hydrolysis heat exchanger drain pipeline and the unit denitration ammonia supply pipeline heat tracing drain pipeline, the drain expansion vessel is communicated with the steam soot blower through the boiler steam soot blowing drain pipeline, the drain expansion vessel is communicated with the urea hydrolysis system through the urea hydrolysis heat exchanger drain pipeline, and the drain expansion vessel is communicated with the unit denitration ammonia supply pipeline through the unit denitration ammonia supply pipeline heat tracing drain pipeline.

[0012] By adopting the above scheme, the drain expansion vessel can be communicated with the steam soot blower, the urea hydrolysis system and the unit denitration ammonia supply pipeline respectively, so that the by-products drain generated by the above three during operation can be recycled and utilized, and the utilization rate of energy is improved.

[0013] In one of the embodiments of the present application, a heat exchanger electric valve is arranged on the drain pipeline, an inlet steam electric valve is arranged on the exhaust pipeline, and the outlet of the water jet air extraction device is communicated with the heat exchanger.

[0014] By adopting the above scheme, the exhaust steam pipeline and the drain pipeline are arranged to realize the simultaneous shunt discharge of gas and liquid, and facilitate the formation of negative pressure in the drain expansion vessel.

[0015] In one of the embodiments of the present application, the outlet of the drain expansion vessel is further provided with an emptying pipeline, an emptying electric valve is arranged on the emptying pipeline, and the emptying pipeline is communicated with the atmospheric environment.

[0016] By adopting the above scheme, when a fault occurs in the system, the emptying electric valve is opened, so that the drain steam in the drain expansion vessel can be smoothly discharged, and safety accidents caused by excessive pressure in the system are avoided.

[0017] In one of the embodiments of the present application, the heat exchanger is provided with a condensate input pipeline and a condensate output pipeline, the condensate input pipeline is provided with an input electric valve, the condensate output pipeline is provided with an output electric valve, and the unit condensate enters the heat exchanger through the condensate input pipeline and is discharged through the condensate output pipeline after heat exchange with the drain water in the heat exchanger.

[0018] By using the above scheme, the unit condensate is introduced into the heat exchanger, so that the heat energy in the drain water can be utilized for heat exchange, thereby improving the energy utilization rate of the drain water.

[0019] In one of the embodiments of the present application, the circulating pipeline is sequentially provided with a drain pump inlet electric valve, a drain pump and a water jet air extraction device electric valve along the discharge direction.

[0020] By using the above scheme, the heat-exchanged drain water can be pressurized and accelerated by the drain pump, thereby generating a high-pressure drain water flow, and the high-speed jet flow of the drain water flow can provide power for the water jet air extraction device, thereby facilitating the extraction of steam and non-condensable gas.

[0021] In one of the embodiments of the present application, the unit condenser pipeline is further provided between the drain pump and the water jet air extraction device electric valve, and the unit condenser pipeline is provided with a condenser electric control valve and communicates with the circulating pipeline and the unit condenser respectively.

[0022] By using the above scheme, the unit condenser pipeline is additionally provided between the drain pump and the water jet air extraction device electric valve, and is connected with the unit condenser, so that the remaining drain water after the use of the water jet air extractor can be recovered to the unit condenser after being pressurized by the drain pump.

[0023] In one of the embodiments of the present application, a starting water supply pipeline is further provided between the water jet air extraction device electric valve and the water jet air extraction device, and the starting water supply pipeline is provided with a starting electric valve and communicates with the water jet air extraction device and a water supply device respectively.

[0024] By using the above scheme, when the high-temperature drain water produced by the drain expansion vessel is insufficient to provide power for the water jet air extraction device, the starting water supply pipeline can be opened to introduce external water into the water jet air extraction device by the water supply device to provide power for the water jet air extraction device.

[0025] In one of the embodiments of the present application, a speed increasing device is further provided on the circulating pipeline, and the speed increasing device is located between the water jet air extraction device electric valve and the water jet air extraction device and communicates with the water jet air extraction device electric valve and the water jet air extraction device.

[0026] By adopting the above scheme, the speed increasing device is additionally arranged in the circulating pipeline, the water flow of the drain water is further increased in speed when passing through the speed increasing device after being pressurized and increased in speed by the drain water pump, and thus the power of the water jet air extraction device is further increased.

[0027] In one embodiment of the present application, the speed increasing device comprises:

[0028] A hollow cylinder, a spiral fluid passage being arranged on the inner wall of the hollow cylinder;

[0029] A liquid inlet pipe, the liquid inlet pipe being tangentially arranged on the upper end of the hollow cylinder and being communicated with the fluid passage.

[0030] By adopting the above scheme, the water flow of the drain water is tangentially jetted into the hollow cylinder through the liquid inlet pipe, and vortex is generated when the water flow flows through the spiral fluid passage, and thus the flow speed of the water flow of the drain water is further increased.

[0031] In summary, the present application has at least one of the following beneficial technical effects:

[0032] 1. By arranging the drain water expander and the heat exchanger in cooperation, the drain water of the high-temperature unit is expanded and flashed in the drain water expander, thereby forming high-temperature steam and drain water, and the heat energy of the steam and the drain water is exchanged to the condensate water of the unit, thereby increasing the energy utilization rate of the industrial byproduct drain water.

[0033] 2. By arranging the water jet air extraction device, the water jet air extraction device can form a negative pressure in the drain water expander, thereby forming more high-temperature drain water, and the drain water after heat exchange can be re-introduced into the water jet air extraction device after being pressurized and increased in speed, thereby providing power for the water jet air extraction device.

[0034] 3. By arranging the speed increasing device, when the drain water after heat exchange flows through the circulating pipeline, the drain water passes through the spiral fluid passage, vortex is generated when the drain water passes through the fluid passage, and the speed of the drain water is increased, thereby further increasing the power of the water jet air extraction device and making the air extraction capacity of the water jet air extraction device stronger. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a schematic diagram of a drain water waste heat recycling system provided by the first embodiment of the present application;

[0036] Figure 2 is a schematic diagram of a drain water waste heat recycling system provided by the second embodiment of the present application;

[0037] Figure 3 is a front view of a speed increasing device of a drain water waste heat recycling system provided by the second embodiment of the present application;

[0038] Figure 4is a plan view of a hydrophobic waste heat recycling system speed increasing device provided by the second embodiment of the present application.

[0039] BRIEF DESCRIPTION OF DRAWINGS: 1, hydrophobic expander; 2, heat exchanger; 3, water jet air extraction device; 4, hydrophobic pump; 5, starting water supply pipeline; 6, circulating pipeline; 7, unit condenser pipeline; 8, condensate input pipeline; 9, condensate output pipeline; 10, water inlet electric valve; 11, boiler steam soot blowing hydrophobic pipeline; 12, urea hydrolysis heat exchanger hydrophobic pipeline; 13, unit denitration ammonia supply pipeline heat tracing hydrophobic pipeline; 14, emptying pipeline; 15, drainage pipeline; 16, exhaust pipeline; 17, starting electric valve; 18, water jet air extraction device water supply electric valve; 19, hydrophobic pump inlet electric valve; 20, input electric valve; 21, output electric valve; 22, condenser electric control valve; 23, speed increasing device; 231, hollow cylinder; 2311, fluid passage; 232, liquid inlet pipe; 24, emptying electric valve. DETAILED DESCRIPTION

[0040] The following will be described in detail below with reference to the accompanying drawings Figures 1-4 A hydrophobic waste heat recycling system provided by the present application will be described in further detail.

[0041] Embodiment 1

[0042] Please refer to Figure 1 A hydrophobic waste heat recycling system provided by the embodiment of the present application comprises a hydrophobic expander 1, a water jet air extraction device 3 and a heat exchanger 2. The inlet of the hydrophobic expander 1 is provided with a hydrophobic input pipeline, and the outlet of the hydrophobic expander 1 is provided with an exhaust pipeline 16 and a drainage pipeline 15. The water jet air extraction device 3 is communicated with the hydrophobic expander 1 through the exhaust pipeline 16 to extract steam and non-condensable gas inside the hydrophobic expander 1, so that a negative pressure is formed inside the hydrophobic expander 1, and hydrophobic water is generated by flashing. The heat exchanger 2 is communicated with the hydrophobic expander 1 through the drainage pipeline 15, so that the hydrophobic water generated by the hydrophobic expander 1 exchanges heat with unit condensate. The heat exchanger 2 is communicated with the water jet air extraction device 3 through a circulating pipeline 6, so that the hydrophobic water after heat exchange is introduced into the water jet air extraction device 3 and provides power for the water jet air extraction device 3. By using the water jet air extraction device 3, a negative pressure is formed inside the hydrophobic expander 1, so that the high-temperature and high-pressure unit hydrophobic water inside the hydrophobic expander 1 is flashed to form high-temperature steam and hydrophobic water, so as to exchange heat with unit condensate by the heat exchanger 2, thereby fully utilizing the heat energy of the hydrophobic water.

[0043] In the embodiment, the water jet air extraction device 3 can be a water jet air extractor, and the heat exchanger 2 can be a horizontal heat exchanger 2.

[0044] Please continue to refer to Figure 1The hydrophobic input pipeline includes a boiler steam soot blowing hydrophobic pipeline 11, a urea hydrolysis heat exchanger 2 hydrophobic pipeline and a unit denitration ammonia supply pipeline heat tracing hydrophobic pipeline 13, the boiler steam soot blowing hydrophobic pipeline 11, the urea hydrolysis heat exchanger 2 hydrophobic pipeline and the unit denitration ammonia supply pipeline heat tracing hydrophobic pipeline 13 are all provided with water inlet electric valves 10, the hydrophobic expander 1 is communicated with the steam soot blower through the boiler steam soot blowing hydrophobic pipeline 11, the hydrophobic expander 1 is communicated with the urea hydrolysis system through the urea hydrolysis heat exchanger 2 hydrophobic pipeline, the hydrophobic expander 1 is communicated with the unit denitration ammonia supply pipeline through the unit denitration ammonia supply pipeline heat tracing hydrophobic pipeline 13, the by-product hydrophobic produced by different industries can be recycled by setting the hydrophobic input pipeline, and the utilization rate of energy is improved.

[0045] Please continue to refer to Figure 1 The drain pipeline 15 is provided with a heat exchanger electric valve, the exhaust steam pipeline 16 is provided with a steam inlet electric valve, the outlet of the water jet air extraction device 3 is communicated with the heat exchanger 2, the steam and the non-condensable gas in the hydrophobic expander 1 are extracted by respectively setting the drain pipeline 15 and the exhaust steam pipeline 16.

[0046] Please continue to refer to Figure 1 The outlet of the hydrophobic expander 1 is also provided with an emptying pipeline 14, the emptying pipeline 14 is provided with an emptying electric valve 24, the emptying pipeline 14 is communicated with the atmosphere, the hydrophobic steam in the hydrophobic expander 1 is discharged by opening the emptying electric valve 24, the system safety is improved by avoiding that the pressure in the system is too large.

[0047] Please continue to refer to Figure 1 The heat exchanger 2 is provided with a condensate water input pipeline 8 and a condensate water output pipeline 9, the condensate water input pipeline 8 is provided with an input electric valve 20, the condensate water output pipeline 9 is provided with an output electric valve 21, the unit condensate water enters the heat exchanger 2 through the condensate water input pipeline 8, after heat exchange with the steam and the hydrophobic in the heat exchanger 2, the unit condensate water is discharged through the condensate water output pipeline 9, the unit condensate water is input into the heat exchanger 2, so that the heat exchanger 2 exchanges heat, and the energy utilization rate of the hydrophobic is improved.

[0048] Please continue to refer to Figure 1 The circulating pipeline 6 is provided with a hydrophobic pump inlet electric valve 19, a hydrophobic pump 4 and a water jet air extraction device water supply electric valve 18 in turn along the discharge direction, the hydrophobic pump 4 can pressurize the hydrophobic flowing out of the heat exchanger 2, the speed of the hydrophobic before entering the water jet air extraction device 3 is improved, and the air extraction capacity of the water jet air extraction device 3 is improved. Please continue to refer to Figure 1, the hydrophobic pump 4 and water injection gas extraction device water supply motor valve 18 between the unit condenser pipeline 7 is also provided, the unit condenser pipeline 7 is provided with condenser electric control valve 22, and is communicated with the circulating pipeline 6 and unit condenser respectively, after the hydrophobic pump pressure, the remaining hydrophobic water is recycled to the unit condenser after ensuring the use of water injection gas extraction device 3.

[0049] Please continue to see Figure 1 , the water injection gas extraction device water supply motor valve 18 and water injection gas extraction device 3 between the start of water supply pipeline 5 is also provided, the start of water supply pipeline 5 is provided with start motor valve 17, the start of water supply pipeline 5 is communicated with water injection gas extraction device 3 and water supply equipment respectively, when the device just starts, by opening the start of water supply pipeline 5, the external water is introduced into the water injection gas extraction device 3 by using the water supply equipment, which is convenient for the water injection gas extraction device 3 to extract gas.

[0050] Example 2

[0051] Example 2 and example 1 are basically the same structure, the difference is that:

[0052] Please see Figure 2 , Figure 3 and Figure 4 , the circulating pipeline 6 is also provided with speed increasing device 23, the speed increasing device 23 is located between the water injection gas extraction device water supply motor valve 18 and the water injection gas extraction device 3, and is communicated with the water injection gas extraction device water supply motor valve 18 and the water injection gas extraction device 3.

[0053] Please see Figure 3 and Figure 4 , the speed increasing device 23 comprises: a hollow cylinder 231 and a liquid inlet pipe 232, the inner wall of the hollow cylinder 231 is provided with a spiral fluid passage 2311, the liquid inlet pipe 232 is tangentially arranged on the upper end of the hollow cylinder 231, and is communicated with the fluid passage 2311, the hollow cylinder 231 is arranged in front of the water injection gas extraction device 3, so that the hydrophobic water can be further speeded up, and the gas extraction capacity of the water injection gas extraction device 3 is improved.

[0054] As described above, when hydrophobic water is needed, the water injection gas extraction device 3 can extract the non-condensable gas in the steam in the hydrophobic water expander 1, so that the hydrophobic water expander 1 produces more hydrophobic water through expansion flash evaporation, so that the temperature of the hydrophobic water is used to heat the condensate of the unit in the heat exchanger 2, so as to improve the energy utilization rate of the hydrophobic water;

[0055] At the same time, after heat exchange, the hydrophobic water is pressurized by the hydrophobic pump 4 and then reenters the water injection gas extraction device 3, so as to continue to provide power for the water injection gas extraction device 3, and further improve the energy utilization rate.

[0056] The following is an example of economic calculation of hydrophobic water recovery in a certain power plant:

[0057] The coal used in the power plant has a high ash content, and the boiler coking is relatively serious. The frequency of blowing ash is high, and the blowing ash device is operated more than twice per shift on average every day. In order to prevent water from being carried by the blowing ash steam, the blowing ash system needs to be regularly drained.

[0058] The steam drainage amount of the urea hydrolysis heater and the denitration heating steam is also large, and the urea pyrolysis drainage discharge point is multiple.

[0059] The above three drainage is not recovered, resulting in a large amount of heat loss. After the above three drainage is transformed by the drainage waste heat utilization system, the energy saving effect is remarkable.

[0060] Details are as follows:

[0061] 1, the boiler blowing ash drainage recovery is as follows:

[0062]

[0063]

[0064] 2, for the urea hydrolysis heater drainage:

[0065] The boiler urea hydrolysis device inlet steam pipeline is DN100, the steam pressure is 0.75MPa, the temperature is 280℃, the drainage pipeline is DN80, and the system keeps continuous operation during the operation of the unit, the drainage amount is about 0.6t / h, that is, 14.4t / d.

[0066] The urea hydrolysis device drainage amount is about 1t / h, that is, 24t / d.

[0067] 3, for the unit denitration ammonia supply pipeline heating drainage:

[0068] The unit denitration ammonia supply pipeline heating is DN32 pipeline, the pressure is 0.75MPa, the ammonia supply pipeline has four drainage, and the drainage amount is about 0.4t / h, that is, 9.6t / d.

[0069] 4, the total drainage amount of the three is 61.6t / d, and the total heat recovery amount of the drainage per day is 51548MJ / d.

[0070] 5, economic benefit analysis (the annual effective utilization hours of the unit are 6500h):

[0071] 1. The total heat recovery amount of the drainage is equivalent to 450t of standard coal per year, the standard coal price is 650yuan / t, and the total annual saving is 290,000yuan / year.

[0072] 2. The annual drainage amount is 16683t / year, the cost of each ton of desalted water is 15yuan, and the saving is 250,000yuan / year.

[0073] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A hydrophobic waste heat recovery system, characterized by, The application relates to a steam extraction device for a power unit. The steam extraction device comprises a hydrophobic expansion vessel (1), a water jet air extraction device (3) and a heat exchanger (2). The hydrophobic expansion vessel (1) is provided with a hydrophobic input pipeline at the inlet, and is provided with a steam discharge pipeline (16) and a water discharge pipeline (15) at the outlet. The water jet air extraction device (3) is communicated with the hydrophobic expansion vessel (1) through the steam discharge pipeline (16) to extract steam and non-condensable gas in the hydrophobic expansion vessel (1) so that negative pressure is formed in the hydrophobic expansion vessel (1) to generate hydrophobicity.

2. The hydrophobic waste heat recovery system of claim 1, wherein: The heat exchanger (2) is communicated with the hydrophobic expansion vessel (1) through the water discharge pipeline (15) so that the hydrophobicity generated by the hydrophobic expansion vessel (1) is exchanged with condensate water of the power unit, and the heat exchanger (2) is communicated with the water jet air extraction device (3) through a circulating pipeline (6) so that the hydrophobicity after heat exchange is introduced into the water jet air extraction device (3) and provides power for the water jet air extraction device (3).

3. The hydrophobic waste heat recovery system of claim 2, wherein: The hydrophobic input pipeline comprises a boiler steam blowing hydrophobic pipeline (11), a urea hydrolysis heat exchanger hydrophobic pipeline (12) and a power unit denitration ammonia supply pipeline heat tracing hydrophobic pipeline (13), and the boiler steam blowing hydrophobic pipeline (11), the urea hydrolysis heat exchanger hydrophobic pipeline (12) and the power unit denitration ammonia supply pipeline heat tracing hydrophobic pipeline (13) are all provided with water inlet electric valves (10).

4. The hydrophobic waste heat recovery system of claim 1, wherein: The hydrophobic expansion vessel (1) is communicated with a steam blowing device through the boiler steam blowing hydrophobic pipeline (11), communicated with a urea hydrolysis system through the urea hydrolysis heat exchanger hydrophobic pipeline (12) and communicated with a power unit denitration ammonia supply pipeline through the power unit denitration ammonia supply pipeline heat tracing hydrophobic pipeline (13).

5. The hydrophobic waste heat recovery system of claim 1, wherein: The water discharge pipeline (15) is provided with a heat exchanger electric valve, the steam discharge pipeline (16) is provided with a steam inlet electric valve, and the outlet of the water jet air extraction device (3) is communicated with the heat exchanger (2).

6. The hydrophobic waste heat recovery system of claim 1, wherein: The outlet of the hydrophobic expansion vessel (1) is further provided with a venting pipeline (14), the venting pipeline (14) is provided with a venting electric valve (24), and the venting pipeline (14) is communicated with the atmosphere.

7. The hydrophobic waste heat recovery system of claim 6, wherein: The heat exchanger (2) is provided with a condensate water input pipeline (8) and a condensate water output pipeline (9), the condensate water input pipeline (8) is provided with an input electric valve (20), the condensate water output pipeline (9) is provided with an output electric valve (21), and the condensate water of the power unit enters the heat exchanger (2) through the condensate water input pipeline (8) and is discharged through the condensate water output pipeline (9) after heat exchange with steam and hydrophobicity in the heat exchanger (2). The circulating pipeline (6) is sequentially provided with a hydrophobic pump inlet electric valve (19), a hydrophobic pump (4) and a water jet air extraction device water supply electric valve (18) along the discharging direction. The hydrophobic pump (4) and the water jet air extraction device water supply electric valve (18) are further provided with a power unit condenser pipeline (7), the power unit condenser pipeline (7) is provided with a condenser electric control valve (22) and is communicated with the circulating pipeline (6) and a power unit condenser respectively.

8. The hydrophobic waste heat recovery system of claim 6, wherein: The water supply electric valve (18) of the water jet air extraction device is further provided with a starting water supply pipeline (5), the starting water supply pipeline (5) is provided with a starting electric valve (17), and the starting water supply pipeline (5) is in communication with the water jet air extraction device (3) and a water supply device respectively.

9. The hydrophobic waste heat recovery system of claim 6, wherein: The circulating pipeline (6) is further provided with a speed increasing device (23), the speed increasing device (23) is located between the water jet air extraction device water supply electric valve (18) and the water jet air extraction device (3) and is in communication with the water jet air extraction device water supply electric valve (18) and the water jet air extraction device (3).

10. The hydrophobic waste heat recovery system of claim 9, wherein: The speed increasing device (23) comprises: A hollow cylinder (231), a spiral fluid channel (2311) is arranged on the inner wall of the hollow cylinder (231); A liquid inlet pipe (232) is arranged on the upper end of the hollow cylinder (231) in a tangential direction and is in communication with the fluid channel (2311).

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