Closed-cycle phase-change superconductive steam engine

Abstract

The invention discloses a closed-cycle phase-change superconductive steam engine, which relates to the field of steam heat exchange and comprises a steam engine main machine, the steam engine main machine is connected with a full-premixing plane combustion system, and a secondary side heat exchanger is arranged at the top of the steam engine main machine; one end of the blowdown waste heat recovery assembly is connected with the secondary side heat exchanger, and the other end of the blowdown waste heat recovery assembly is connected with the normal-pressure condenser; and the flue gas waste heat recovery assembly is connected with the steam engine main machine and the pollution discharge waste heat recovery assembly and is connected with the water inlet end of the secondary side heat exchanger at the same time. The steam engine secondary side heat exchanger is used for forming a closed reciprocating circulation system, only one boiler of water is burnt permanently, no water supplementing device is arranged, and the fault risk caused by the water quality problem is avoided; and the waste heat recovery assembly and the flue gas waste heat recovery assembly are used for preheating cold water, so that the use of fuel and the loss of heat are reduced.

Description

Technical Field

[0001] The invention relates to the field of steam heat exchange, in particular to a closed-cycle phase-change superconducting steam engine. Background Art

[0002] A steam generator is a device that uses fuel or other energy to heat water into hot water or steam. It is an indispensable and important device in modern industry and daily life. The working principle of a steam generator is based on heat exchange. It generates heat by burning fuel or other means, heats water into steam, and then processes it to generate steam of the required temperature and pressure. In industrial production, steam generators are often used to provide power, heating, drying, etc. In the field of power generation, it is an important part of a power station, generating electricity through steam-driven turbines; in the civilian field, steam generators can be used to provide heating, hot water, and food processing, etc.

[0003] However, in the existing steam generator, the loss of internal medium during operation leads to water shortage, and the relevant heat medium needs to be added regularly. During the process of adding the heat medium, outside air enters, causing corrosion to the inner wall, reducing the service life of the steam engine; at the same time, due to the poor purity of the heat medium, scaling often occurs inside the steam engine, and due to the failure of the water supply system, the water supply is not added in time, resulting in dry burning explosion, poor steam quality, low thermal efficiency, excessive nitrogen oxide emissions and other problems.

[0004] In view of the above problems, the present invention provides a closed-cycle phase-change superconducting steam engine to solve the above problems. Summary of the invention

[0005] To achieve the above object, the present invention provides the following technical solution: a closed-cycle phase-change superconducting steam engine, comprising: a steam engine main engine, the steam engine main engine is connected to a fully premixed plane combustion system, and a secondary side heat exchanger is arranged on the top of the steam engine main engine;

[0006] The exhaust waste heat recovery component is connected to the secondary side heat exchanger at one end and to the atmospheric pressure condenser at the other end; the flue gas waste heat recovery component is connected to the steam engine main engine and the exhaust waste heat recovery component respectively, and is also connected to the water inlet end of the secondary side heat exchanger;

[0007] Among them, the flue gas waste heat recovery component includes: a pressure economizer, on which a flue gas heat exchange pipe is arranged, one end of the flue gas heat exchange pipe is connected to the flue gas outlet of the steam engine main engine, and the other end is connected to the normal pressure condenser, which is used to replace the flue gas heat; the normal pressure condenser is a shell and tube heat exchanger, one end of the internal tube layer is connected to the flue gas heat exchange pipe, and the other end is provided with a chimney interface.

[0008] Further, preferably, the steam engine host includes a combustion chamber, the combustion chamber is connected to the full premixed plane combustion system, and is connected to the steam engine host heat exchange tube bundle at one end of the combustion chamber. The steam engine host is connected to the secondary condensate header of the secondary heat exchanger through the condensate return pipe, and the steam outlet pipe of the steam engine host is connected to the high-temperature steam header of the secondary heat exchanger;

[0009] A fire viewing hole is also provided on the combustion chamber.

[0010] Further, preferably, the secondary side heat exchanger is a multi-stage parallel double-layer shell and tube heat exchange structure, including a shell layer and an inner tube layer, the upper part of the shell layer is connected to the high-temperature steam header, and the lower part is connected to the secondary side condensate header;

[0011] The lower part of the internal pipe layer 8 is connected to the outlet pipe of the pressure economizer, and the upper part is connected to the secondary side steam header.

[0012] Further, preferably, the water inlet end of the pressure economizer is connected to the sewage waste heat recovery component through a pipeline.

[0013] Further, preferably, the sewage waste heat recovery component includes a high-pressure water pump, and the water inlet of the high-pressure water pump is connected to the water outlet of the atmospheric pressure condenser; a high-pressure electronic valve is provided at the water outlet of the high-pressure water pump, and the high-pressure electronic valve is connected to the water inlet end of the secondary side sewage waste heat recovery device, and the discharge end of the secondary side sewage waste heat recovery device is connected to the water inlet end of the pressure energy saver through a high-pressure pipeline.

[0014] Further, preferably, an automatic drain valve is provided at the drain inlet end of the secondary side drain waste heat recovery device, and the automatic drain valve is connected to the secondary side water inlet manifold through a secondary side drain pipe; a drain pipe is provided at the drain outlet end of the secondary side drain waste heat recovery device.

[0015] Furthermore, preferably, the atmospheric pressure condenser is also provided with an atmospheric pressure cold water inlet.

[0016] Further, preferably, a liquid level gauge and a hand hole assembly are also provided on the secondary side heat exchanger; and a secondary side steam outlet is provided on the secondary side steam header;

[0017] The secondary side steam outlet is connected to the user's gas end.

[0018] Further, preferably, the fully premixed planar combustion system includes a secondary mixing chamber, one end of which is connected to the combustion chamber, and the other end of which is provided with a variable frequency fan and a gas inlet.

[0019] Furthermore, preferably, it also includes a remote control monitoring function and a water quality detection system; the remote control monitoring system is used to display the operating status of the steam engine main unit, the sewage waste heat recovery component and the flue gas waste heat recovery component in real time, and to control, adjust and optimize the respective operating status; the water quality detection system is used to monitor the quality of the water source in the working state.

[0020] Compared with the prior art, the present invention provides a closed-cycle phase-change superconducting steam engine, which has the following beneficial effects:

[0021] 1. Through two reverse heat exchanges, the temperature difference is used to improve the heat exchange efficiency.

[0022] The first reverse heat exchange: when the high-temperature flue gas is just discharged from the steam engine main engine, the flue gas heat exchange tube installed on the pressure economizer quickly transfers the heat to the water source in the pressure economizer, and the flow direction of the water source in the pressure economizer is opposite to the flow direction of the flue gas in the flue gas heat exchange tube, thereby further improving the absorption of the heat of the high-temperature flue gas by the water source in the pressure economizer and increasing the water source temperature in the pressure economizer.

[0023] Second reverse heat exchange: After the first reverse heat exchange, the flue gas temperature drops significantly. At this time, the flue gas at this temperature is guided to the heat exchange tubes in the atmospheric pressure condenser. Since the water temperature in the atmospheric pressure condenser is at room temperature, which is significantly lower than the flue gas temperature, the effect of replacing the waste heat in the flue gas is improved by increasing the temperature difference. At the same time, the water source flow direction in the atmospheric pressure condenser shell is opposite to the flue gas flow direction in the tube layer, which further improves the replacement effect of the flue gas waste heat and increases the initial water source temperature in the atmospheric pressure condenser.

[0024] In summary, by performing reverse heat exchange twice on the heat of flue gas emissions, the water inlet temperature of the secondary heat exchanger is greatly increased, and the flue gas emission temperature is reduced, thereby improving the efficiency of the secondary heat exchanger in converting water into steam.

[0025] 2. After the steam in the shell of the shell and tube heat exchanger exchanges heat with the water source, the heat is released and condensed into water, which is gathered in the secondary condensate header. The condensed water in the secondary condensate header returns to the boiler through the condensate return pipe, thus forming a closed natural circulation of the heat medium. The main engine of the steam engine only burns one boiler of water permanently, without a water replenishment device, avoiding the risk of scaling of the steam engine due to water quality problems and the risk of failure caused by water shortage in the main engine of the steam engine.

[0026] 3. The nitrogen oxide emission of the full-scale mixed plane combustion system can easily reach 20㎎ / m 3 the following.

[0027] 4. Advanced control system and remote monitoring system can realize unmanned operation of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall schematic diagram of a closed-cycle phase-change superconducting steam engine;

[0029] Figure 2 A schematic diagram of the connection between a closed-cycle phase-change superconducting steam engine heat exchanger and a normal-pressure economizer;

[0030] Figure 3 A closed-cycle phase-change superconducting steam engine smoke exhaust connection circuit diagram;

[0031] In the figure: 1. Frequency conversion fan; 2. Secondary mixing chamber; 3. Steam engine host; 4. High-pressure water pump; 5. Normal pressure condenser; 6. Pressure economizer; 7. Secondary side heat exchanger; 8. Condensate return pipeline; 9. Secondary side sewage waste heat recovery device; 10. Water inlet of high-pressure water pump; 11. High-pressure pipeline; 12. Secondary side sewage pipe; 13. Automatic sewage valve; 14. Sewage pipe; 15. Hand hole assembly; 16. Cold water inlet; 17. Secondary side steam outlet; 18. Side liquid level gauge; 19. Steam outlet pipeline; 20. Secondary side condensate header; 21. Secondary side water inlet header; 22. Secondary side steam header; 23. High-temperature steam header; 24. Safety valve; 25. Water outlet pipe; 26. Chimney interface; 27. High-voltage electronic valve; 29. ​​Flue gas heat exchange tube; 30. Fire viewing hole. DETAILED DESCRIPTION

[0032] Reference Figures 1 to 3 The present invention provides a technical solution: a closed-cycle phase-change superconducting steam engine, comprising: a steam engine main engine 3, the steam engine main engine 3 is connected to a fully premixed plane combustion system, and a secondary side heat exchanger 7 is arranged on the top of the steam engine main engine 3;

[0033] A waste heat recovery component for exhaust is connected to the secondary side heat exchanger 7 at one end and to the atmospheric pressure condenser 5 at the other end; a flue gas waste heat recovery component is connected to the steam engine main unit 3 and the waste heat recovery component for exhaust, respectively, and is also connected to the water inlet end of the secondary side heat exchanger 7;

[0034] Among them, the flue gas waste heat recovery component includes: a pressure economizer 6, on which a flue gas heat exchange pipe 29 is arranged, one end of the flue gas heat exchange pipe is connected to the flue gas outlet of the steam engine main unit 3, and the other end is connected to the normal pressure condenser 5, which is used to replace the flue gas heat; multiple rows of heat exchange pipes are arranged in the normal pressure condenser 5, one end of the heat exchange pipe is connected to the flue gas heat exchange pipe, and the other end is provided with a chimney interface 26.

[0035] The mixed gas is provided by a fully premixed plane combustion system, and the steam engine main unit 3 ignites the mixed gas to heat the heat medium therein. The heat medium vaporizes after fully absorbing heat, and the steam generated by vaporization is transmitted to the secondary side heat exchanger 7. The secondary side heat exchanger 7 transfers the heat carried by the steam to the water source, thereby vaporizing the water source for use by users at the user end.

[0036] The combustion exhaust gas generated by the ignition of the mixed gas by the steam engine main unit 3 undergoes two reverse heat exchanges under the action of the flue gas waste heat recovery component, thereby increasing the temperature of the water source at the water inlet end of the secondary side heat exchanger 7, thereby improving the efficiency of converting the water source of the secondary side heat exchanger 7 into steam.

[0037] Two reverse heat exchange:

[0038] The first reverse heat exchange: when the high-temperature flue gas is just discharged from the steam engine main unit 3, the flue gas heat exchange pipe 29 arranged on the pressure economizer 6 quickly transfers the heat to the water source in the pressure economizer 6, and the flow direction of the water source in the pressure economizer 6 is opposite to the flow direction of the flue gas in the flue gas heat exchange pipe 29, thereby further improving the absorption of the heat of the high-temperature flue gas by the water source in the pressure economizer 6 and increasing the water source temperature in the pressure economizer 6.

[0039] Second reverse heat exchange: After the first reverse heat exchange, the flue gas temperature drops significantly. At this time, the flue gas at this temperature is guided to the heat exchange tube in the atmospheric pressure condenser 5. Since the water temperature in the atmospheric pressure condenser 5 is at room temperature, which is significantly lower than the flue gas temperature, the effect of replacing the residual heat in the flue gas is improved by increasing the temperature difference. At the same time, the flow direction of the water source in the atmospheric pressure condenser 5 is opposite to the flow direction of the flue gas in the heat exchange tube, which further improves the replacement effect of the flue gas residual heat and increases the initial water source temperature in the atmospheric pressure condenser 5.

[0040] After completing the second heat exchange, the flue gas is close to room temperature and is finally discharged to the outside through the chimney interface 26.

[0041] It should be noted that when the secondary side heat exchanger 7 is operating normally, it is necessary to discharge sewage automatically and regularly. The high-temperature sewage discharged during the regular automatic sewage discharge process is heat exchanged with the water source discharged from the atmospheric pressure condenser 5 through the sewage discharge waste heat recovery component, and the sewage flow direction in the sewage discharge waste heat recovery component is opposite to the flow direction of the water source discharged from the atmospheric pressure condenser 5, thereby realizing the third reverse heat exchange, reducing the heat in the sewage discharge, and further improving the utilization rate of heat.

[0042] As a preferred embodiment, the steam engine main engine 3 includes a combustion chamber, which is connected to the full premixed plane combustion system, and a steam engine main engine heating tube bundle is arranged at one end of the combustion chamber. The steam engine main engine heat exchange tube bundle is connected to the secondary side condensate header 20 of the secondary side heat exchanger 7 through the condensate return pipe 8, and the steam outlet pipe 19 of the steam engine main engine is connected to the high-temperature steam header 23 of the secondary side heat exchanger 7;

[0043] A fire viewing hole 30 is also provided on the combustion chamber; and a safety valve 24 is also provided on the steam outlet pipe 19 of the boiler. The safety valve 24 ensures that the steam pressure in the steam engine main engine 3 exceeds the set pressure and brakes the pressure relief to prevent accidents caused by excessive internal pressure of the steam engine main engine 3, thereby improving the safety of equipment use.

[0044] As a preferred embodiment, the secondary side heat exchanger 7 is a multi-stage parallel double-layer shell and tube heat exchange structure, including a shell layer and a tube layer, the upper part of the shell layer is connected to the high-temperature steam header 23, and the lower part is connected to the secondary side condensate header 20;

[0045] The lower part of the pipe layer is connected to the water outlet pipe 25 of the pressure economizer 6, and the upper part is connected to the secondary side steam header 22.

[0046] It should be noted that the mixed gas is burned through the combustion chamber to heat the heat medium in the steam engine main unit to generate steam, and the high-temperature steam enters the high-temperature steam header 23 through the steam outlet pipe 19. The high-temperature steam entering the high-temperature steam header 23 flows to the shell layer of the secondary side heat exchanger 7.

[0047] The internal tube layer of the secondary side heat exchanger 7 is filled with the preheated water source from the pressure economizer 6 through the water inlet end, that is, the water source of the internal tube layer is heated by the high-pressure steam of the heat exchanger shell, so that the water source of the tube layer is heated and steamed. The steam after steaming is collected in the secondary side steam header 22, and finally enters the secondary side steam outlet 17 for discharge.

[0048] After the steam in the shell of the secondary heat exchanger exchanges heat with the water source in the internal pipe layer, the heat is released and condensed into water, which is gathered in the secondary condensate header 20. The condensed water in the secondary condensate header 20 returns to the steam engine main unit through the condensate return pipe 8, thus forming a closed circulation of the heat medium of the steam engine main unit, achieving the goal of permanently burning only one boiler of water without a water replenishment device, avoiding the risk of failure caused by water quality problems or water shortage problems.

[0049] As a preferred embodiment, the water inlet end of the pressure energy saver 6 is connected to the sewage waste heat recovery component through a pipeline.

[0050] As a preferred embodiment, the sewage waste heat recovery component includes a high-pressure water pump 4, and the water inlet 10 of the high-pressure water pump is connected to the water outlet of the atmospheric pressure condenser 5; a high-pressure electronic valve 27 is provided at the water outlet of the high-pressure water pump, and the high-pressure electronic valve 27 is connected to the water inlet end of the secondary side sewage waste heat recovery device 9, and the discharge end of the secondary side sewage waste heat recovery device 9 is connected to the water inlet end of the pressure energy saver 6 through a high-pressure pipeline 11.

[0051] It should be noted that the high-pressure water pump 4 pressurizes the water source in the atmospheric condenser 5 and reversely flows through the secondary side sewage preheat recovery device 9. After passing through the secondary side sewage waste heat recovery device 9, the water source flows into the pressure economizer 6.

[0052] When the secondary side heat exchanger 7 is automatically drained at a scheduled time, the secondary side drain pipe 12 discharges the hot water source in the internal pipe layer of the secondary side heat exchanger 7 into the secondary side drain waste heat recovery device 9. At this time, the secondary side drain waste heat recovery device 9 transfers and replaces its heat to the water source before entering the pressure energy saver 6, thereby increasing the temperature of the water source entering the pressure energy saver 6; in the secondary side drain waste heat recovery device 9, the flow direction of the wastewater discharge is opposite to the flow direction of the water source, thereby further improving the heat replacement effect and the heat transfer efficiency.

[0053] As a preferred embodiment, an automatic drain valve 13 is provided at the drain inlet end of the secondary side drain waste heat recovery device 9, and the automatic drain valve 13 is connected to the secondary side water inlet manifold 21 through a secondary side drain pipe 12; a drain pipe 14 is provided at the drain outlet end of the secondary side drain waste heat recovery device 9.

[0054] The atmospheric pressure condenser 5 is also provided with an atmospheric pressure cold water inlet 16 .

[0055] It should be noted that, by providing the automatic drain valve 13 , the secondary side heat exchanger 7 is automatically drained and cleaned regularly to ensure that the heat conversion efficiency of the secondary side heat exchanger 7 is in the best working state.

[0056] The waste water treated by the secondary side waste heat recovery device 9 is discharged to the sewer through the sewage pipe 14.

[0057] As a preferred embodiment, a liquid level gauge 18 and a hand hole assembly 15 are also provided on the secondary side heat exchanger 7; and a secondary side steam outlet 17 is provided on the secondary side steam header 22;

[0058] The secondary side steam outlet 17 is connected to the user's gas end.

[0059] The hand hole assembly 15 is provided to facilitate the removal of scale from the internal tube layer of the secondary side heat exchanger 7 to ensure the stability of the heat exchange efficiency. The steam in the secondary side steam header 22 is connected to the user through the secondary side steam outlet 17 for use by the user.

[0060] As a preferred embodiment, the fully premixed planar combustion system includes a secondary mixing chamber, one end of which is connected to the combustion chamber, and the other end of which is provided with a variable frequency fan 1 and a gas inlet.

[0061] The heat medium inside the steam engine main engine is vaporized and converted into steam by absorbing the heat provided by the combustion system, and then the heat is transferred to the secondary side heat exchanger through the steam. That is, the warm water in the secondary side heat exchanger is heated by high-temperature steam and converted into steam. When the steam in the secondary side heat exchanger releases heat, it condenses back into the heat medium water in the steam engine main engine, thereby completing reheating and vaporization, forming a closed reciprocating cycle, so as to achieve permanent burning of only one boiler of water, without a water replenishment device, and avoiding the risk of failure caused by water quality problems.

[0062] As a preferred embodiment, the fully premixed planar combustion system includes a secondary premixing chamber 2, a fuel outlet of the secondary premixing chamber 2 is connected to the combustion chamber, and a fan 1 is provided at the fuel inlet of the secondary premixing chamber 2.

[0063] As a preferred embodiment, a liquid level meter 18 is also provided on the secondary side heat exchanger 7 .

[0064] After the gas and air are mixed once by the variable frequency fan 1, they enter the secondary premixing chamber 2 for secondary mixing, achieving high-precision and full mixing. The mixed gas enters the combustion chamber for combustion. The flat burner is equipped with a furnace water channel and several strip-shaped precision rectangular gaps. After precise ignition, it enters the combustion state, and the flame temperature is as high as about 1400°. A flame stabilization and cooling tube bundle is installed at the root of the flame to reduce the flame temperature from the root to about 800°, achieving ultra-low nitrogen emissions and stabilizing the flame.

[0065] As a preferred embodiment, a closed-cycle phase-change superconducting steam engine further includes: a remote control monitoring function and a water quality detection system;

[0066] The remote control monitoring system is used to display the operating status of the steam engine main engine, the sewage waste heat recovery component and the flue gas waste heat recovery component in real time, and to control, adjust and optimize the adjustments according to their respective operating statuses, so as to further improve the waste heat recovery rate and reduce the emission of waste heat.

[0067] The water quality detection system is used to monitor the quality of water sources during operation, to avoid equipment failures due to water quality problems and the need for frequent cleaning of equipment, thereby increasing the service life of the equipment.

[0068] In specific implementation, the steam engine main unit 3 is heated by a fully premixed planar combustion system, and the high-temperature steam generated by the steam engine main unit 3 during the heating process enters the secondary side heat exchanger 7. At the same time, the high-temperature flue gas discharged from the end of the steam engine main unit preheats the water sources in the pressure condenser 6 and the atmospheric pressure condenser 5 twice through the flue gas heat exchange pipe 29. The cold water is converted into warm water after preheating. The warm water enters the secondary side heat exchanger 7 and completes the change from water to steam under the action of high-temperature steam. The generated steam is discharged through the secondary side steam outlet 17 of the secondary side heat exchanger 7 for user use.

[0069] As a preferred embodiment, the steam engine host is equipped with an extremely low liquid level monitoring device:

[0070] The extremely low liquid level monitoring device is a protective device for monitoring the accidental leakage of the heat medium inside the steam engine main engine, further ensuring the risk of steam engine failure.

[0071] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A closed-cycle phase-change superconducting steam engine, characterized in that: include: A steam engine main engine (3), the steam engine main engine (3) being connected to a fully premixed plane combustion system, and a secondary side heat exchanger (7) being arranged on the top of the steam engine main engine (3); A waste heat recovery component, one end of which is connected to the secondary heat exchanger (7), and the other end of which is connected to the atmospheric condenser (5); a flue gas waste heat recovery component, which is respectively connected to the steam engine main unit (3) and the waste heat recovery component, and is also connected to the water inlet end of the secondary heat exchanger (7); The flue gas waste heat recovery component comprises: a pressure-bearing economizer (6), on which a flue gas heat exchange pipe (29) is arranged, one end of the flue gas heat exchange pipe is connected to the flue gas outlet of the steam engine main unit (3), and the other end is connected to the normal pressure condenser (5), so as to replace the heat of the flue gas; a plurality of rows of heat exchange plates are arranged in the normal pressure condenser (5), one end of the heat exchange plate is connected to the flue gas heat exchange pipe, and the other end is provided with a chimney interface (26).

2. A closed-cycle phase-change superconducting steam engine according to claim 1, characterized in that: The steam engine main engine (3) includes a combustion chamber, the combustion chamber is connected to the full premixed plane combustion system, a boiler is arranged on the top of the combustion chamber, the boiler is connected to the secondary condensate header (20) of the secondary heat exchanger (7) through a condensate return pipe (8), and the steam outlet pipe (19) of the boiler is connected to the high-temperature steam header (23) of the secondary heat exchanger (7); A fire viewing hole (30) is also provided on the combustion chamber; and a safety valve (24) is also provided on the steam outlet pipe (19) of the boiler.

3. A closed-cycle phase-change superconducting steam engine according to claim 2, characterized in that: The secondary side heat exchanger (7) is a multi-stage parallel double-layer shell and tube heat exchange structure, comprising a shell layer and a tube layer, the upper part of the shell layer is connected to the high-temperature steam header (23), and the lower part is connected to the secondary side condensate header (20); The lower part of the pipe layer is connected to the water outlet pipe (25) of the pressure-bearing economizer (6), and the upper part is connected to a secondary side steam header (22).

4. A closed-cycle phase-change superconducting steam engine according to claim 3, characterized in that: The water inlet end of the pressure-bearing economizer (6) is connected to the waste heat recovery component through a pipeline.

5. A closed-cycle phase-change superconducting steam engine according to claim 4, characterized in that: The waste heat recovery component comprises a high-pressure water pump (4), the water inlet (10) of the high-pressure water pump is connected to the water outlet of the atmospheric condenser (5); a high-pressure electronic valve (27) is arranged at the water outlet of the high-pressure water pump, the high-pressure electronic valve (27) is connected to the water inlet end of the secondary waste heat recovery device (9), and the discharge end of the secondary waste heat recovery device (9) is connected to the water inlet end of the pressure energy saver (6) through a high-pressure pipeline (11).

6. A closed cycle phase change superconducting steam engine according to claim 5, characterized in that: An automatic sewage discharge valve (13) is provided at the sewage discharge inlet end of the secondary sewage discharge waste heat recovery device (9), and the automatic sewage discharge valve (13) is connected to the secondary water inlet header (21) via a secondary sewage discharge pipe (12); a sewage discharge pipe (14) is provided at the sewage discharge outlet end of the secondary sewage discharge waste heat recovery device (9).

7. A closed cycle phase change superconducting steam engine according to claim 1, characterized in that: The atmospheric pressure condenser (5) is also provided with an atmospheric pressure cold water inlet (16).

8. A closed cycle phase change superconducting steam engine according to claim 3, characterized in that: A liquid level meter (18) and a hand hole assembly (15) are also provided on the secondary side heat exchanger (7); and a secondary side steam outlet (17) is provided on the secondary side steam header (22); The secondary side steam outlet (17) is connected to the user's gas end.

9. A closed cycle phase change superconducting steam engine according to claim 2, characterized in that: The fully premixed planar combustion system comprises a secondary mixing chamber, one end of which is connected to the combustion chamber, and the other end of which is provided with a variable frequency fan (1) and a gas inlet.

10. A closed cycle phase change superconducting steam engine according to claim 1, characterized in that: It also includes remote control monitoring functions and water quality testing systems; The remote control monitoring system is used to display the operating status of the steam engine main unit (3), the waste heat recovery component and the flue gas waste heat recovery component in real time, and to perform control, adjustment and optimization according to their respective operating status; The water quality detection system is used to monitor the quality of water sources in a working state.

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