A steam energy-saving system for autoclave and its working method

Abstract

This invention discloses an autoclave steam energy-saving system and its operating method, comprising a main steam pipeline, a medium-pressure steam pipeline, a low-pressure steam pipeline, four autoclaves, a heat exchanger, a clarifier, a flash tank, a gas storage tank, and two steam jet pumps. This invention utilizes steam jet pumps to pressurize residual steam within the autoclaves for heating the autoclaves to be steamed, maximizing steam utilization and reducing energy waste. Condensate from the autoclave is fed into the flash tank, where the flashed steam is pressurized by the steam jet pump and used as pre-steam for the autoclaves to be steamed. The flashed condensate enters the heat exchanger tank for heating domestic water. Condensate flowing from the heat exchanger enters the clarifier, is clarified, and then undergoes pre-boiler water treatment before entering the boiler for reuse. This invention maximizes the utilization of autoclave exhaust steam, fully utilizes the residual energy contained in the condensate within the autoclaves, achieves water recycling, and realizes the goals of environmental protection and energy conservation.

Description

Technical Field

[0001] This invention belongs to the field of energy conservation and environmental protection technology, specifically relating to an autoclave steam energy-saving system and its working method. Background Technology

[0002] An autoclave, also known as a steam curing autoclave or pressure autoclave, is used to cure products at high temperatures. It is the main equipment for manufacturing silicate building products such as sand-lime bricks. At the same time, it is also widely used in rubber vulcanization, heavy metal smelting, refractory brick impregnation and carburizing, composite glass steam curing, wood drying and anti-corrosion treatment, high-pressure treatment of chemical fiber products, high-temperature and high-pressure treatment of food canning, pulp cooking, cable vulcanization, and aerospace industries.

[0003] In existing technologies, after the autoclave insulation process is completed, the steam and condensate inside are directly discharged into the environment. However, the steam discharged from the autoclave still has a relatively high temperature and pressure, possessing significant energy utilization value. Furthermore, the condensate inside the autoclave after operation also has a relatively high temperature and potential for utilization; however, the condensate contains many impurities, and direct discharge would harm the environment. In summary, existing autoclaves consume a lot of energy and pollute the environment. Therefore, how to maximize the utilization of autoclave exhaust steam and how to recycle condensate are urgent problems that those skilled in the art need to solve. Summary of the Invention

[0004] Technical problem to be solved: In view of the above-mentioned technical problems, the present invention provides a steam energy-saving system for autoclave and its working method, which can effectively solve the shortcomings of the above-mentioned autoclave exhaust steam and condensate not being recycled and directly discharged, which damages the environment.

[0005] Technical solution: In a first aspect, the present invention provides a steam energy-saving system for an autoclave, comprising a main steam pipeline, a medium-pressure steam pipeline, a low-pressure steam pipeline, a first evaporator, a second evaporator, a third evaporator, a fourth evaporator, a heat exchanger, a clarifier, a flash tank, a gas storage tank, a first steam jet pump, and a second steam jet pump.

[0006] The low-pressure steam pipeline is connected to the first inlet and outlet of the first evaporator, the first inlet and outlet of the second evaporator, the first inlet and outlet of the third evaporator, the first inlet and outlet of the fourth evaporator, and the outlet of the gas storage tank via branch pipes.

[0007] The medium-pressure steam pipeline is connected via branch pipes to the second inlet and outlet ports of the first evaporator, the second inlet and outlet ports of the second evaporator, the third evaporator, the fourth evaporator, and the outlet port of the first steam jet pump.

[0008] The main steam pipeline is connected to the third inlet and outlet ports of the first evaporator, the second evaporator, the third evaporator, the fourth evaporator, the inlet of the first steam jet pump, and the inlet of the second steam jet pump via branch pipes.

[0009] The fourth inlet and outlet ports of the first evaporator, the second evaporator, the third evaporator, and the fourth evaporator are all connected to the inlet port of the first steam jet pump. The condensate outlets of the first evaporator, the second evaporator, the third evaporator, and the fourth evaporator are all connected to the inlet port of the flash tank. The outlet port of the flash tank is connected to the inlet of the second steam jet pump. The condensate from the flash tank passes through a heat exchanger and a clarifier before entering the boiler. The outlet of the second steam jet pump is connected to the inlet port of the gas storage tank.

[0010] Preferably, the heat exchanger is connected to the domestic water system and uses domestic water as the cold fluid.

[0011] Preferably, the water in the clarification tank is filtered and softened before entering the boiler.

[0012] Preferably, the bottoms of both the flash tank and the heat exchanger are detachable.

[0013] Preferably, the branch pipe connecting the low-pressure steam pipeline to the first inlet and outlet of the first evaporator is equipped with a first valve, the branch pipe connecting to the first inlet and outlet of the second evaporator is equipped with a sixth valve, the branch pipe connecting to the first inlet and outlet of the third evaporator is equipped with a twenty-second valve, the branch pipe connecting to the first inlet and outlet of the fourth evaporator is equipped with a twenty-seventh valve, and the branch pipe connecting to the outlet of the gas storage tank is equipped with a thirtieth valve.

[0014] A second valve is installed on the branch pipe connecting the medium-pressure steam pipeline to the second inlet and outlet of the first evaporator; a seventh valve is installed on the branch pipe connecting the second inlet and outlet of the second evaporator; a nineteenth valve is installed on the branch pipe connecting the second inlet and outlet of the third evaporator; and a twenty-fourth valve is installed on the branch pipe connecting the second inlet and outlet of the fourth evaporator.

[0015] A third valve is installed on the branch pipe connecting the main steam pipe to the third inlet and outlet of the first evaporator; an eighth valve is installed on the branch pipe connecting to the third inlet and outlet of the second evaporator; a twentieth valve is installed on the branch pipe connecting to the third inlet and outlet of the third evaporator; a twenty-fifth valve is installed on the branch pipe connecting to the third inlet and outlet of the fourth evaporator; a thirty-first valve is installed on the branch pipe connecting to the inlet of the first steam jet pump; and a thirteenth valve is installed on the branch pipe connecting to the inlet of the second steam jet pump.

[0016] A fourth valve is installed on the branch pipe connecting the fourth inlet / outlet of the first evaporator to the inlet of the first steam jet pump; a ninth valve is installed on the branch pipe connecting the fourth inlet / outlet of the second evaporator to the inlet of the first steam jet pump. Both the fourth and ninth valves are connected to the inlet of the first steam jet pump via a branch pipe equipped with a twelfth valve. A twenty-first valve is installed on the branch pipe connecting the fourth inlet / outlet of the third evaporator to the inlet of the first steam jet pump; a twenty-sixth valve is installed on the branch pipe connecting the fourth inlet / outlet of the fourth evaporator to the inlet of the first steam jet pump; both the twenty-first and twenty-sixth valves are connected to the inlet of the first steam jet pump via a branch pipe equipped with an eighteenth valve. A fifth valve is installed on the branch pipe connecting the condensate outlet of the first evaporator to the inlet of the flash tank. The condensate outlet of the second evaporator... A tenth valve is installed on the branch pipe connecting the condensate outlet to the flash tank inlet. Both the fifth and tenth valves are connected to the flash tank inlet via a branch pipe equipped with the fifteenth valve. A twenty-third valve is installed on the branch pipe connecting the condensate outlet of the third evaporator to the flash tank inlet. A twenty-eighth valve is installed on the branch pipe connecting the condensate outlet of the fourth evaporator to the flash tank inlet. Both the twenty-third and twenty-eighth valves are connected to the flash tank inlet via a branch pipe equipped with the seventeenth valve. A fourteenth valve is installed on the pipe connecting the flash tank outlet to the inlet of the second steam jet pump. A sixteenth valve is installed on the pipe connecting the flash tank to the heat exchanger. An eleventh valve is installed on the pipe connecting the heat exchanger to the clarifier. A twenty-ninth valve is installed on the pipe connecting the outlet of the second steam jet pump to the inlet of the gas storage tank.

[0017] Secondly, the present invention provides a method for operating a steam energy-saving system for an autoclave. When the first and second evaporators are used as heat-preserving vessels, and the third and fourth evaporators are used as vessels to be steamed, all valves are closed. The thirtieth, twenty-second, and twenty-seventh valves are opened to allow steam from the storage tank to enter the third and fourth evaporators respectively to preheat the vessel bodies. After preheating, the thirtieth, first, and sixth valves are closed. After the heat preservation of the first and second evaporators is completed, the second, seventh, nineteenth, and twenty-fourth valves are opened to introduce high-pressure steam from the first and second evaporators into the third and fourth evaporators. After pressure balance, the second valve and... The seventh valve; opening the fourth, ninth, twelfth, and thirty-first valves activates the first steam jet pump, directing residual steam from the first and second evaporators into the third and fourth evaporators. After completion, the thirty-first, twelfth, nineteenth, and twenty-fourth valves are closed sequentially. The twentieth and twenty-fifth valves are then opened to replenish steam to the third and fourth evaporators. Once the working pressure is reached, the twentieth and twenty-fifth valves are closed, and the third and fourth evaporators begin heat preservation. The fifth, tenth, and fifteenth valves are opened, allowing condensate from the first and second evaporators to enter the flash tank and flash-evaporate into steam. The thirteenth, fourteenth, and... Valve 29, the second steam jet pump pressurizes the steam and introduces it into the storage tank. Simultaneously, valves 11 and 16 are opened, allowing condensate from the flash tank to flow into the heat exchanger for heat exchange with domestic water. After heat exchange, the condensate is discharged into the clarification tank, where it undergoes sedimentation and softening before entering the boiler. After the condensate in the first and second evaporators is drained, valves 5, 10, 13, and 29 are closed sequentially. At this point, the first and second evaporators become preheating vessels. Valve 30, 1, and 6 are opened to allow steam from the storage tank to enter the first and second evaporators for preheating. After pressure balance, valves 30, 1, and 6 are closed. Valve 19 is then opened... Valve 24, valve 2, and valve 7 are used to introduce high-pressure steam from the third and fourth evaporators into the first and second evaporators. Once the pressure is balanced, valve 19 and valve 24 are closed. Valve 26, valve 21, valve 18, and valve 31 are then opened, and the first steam jet pump starts working, introducing residual steam from the third and fourth evaporators into the first and second evaporators. After this is completed, valve 31, valve 18, valve 2, and valve 7 are closed sequentially. Valve 3 and valve 8 are then opened to replenish steam to the third and fourth evaporators. Once the working pressure is reached, valve 3 and valve 8 are closed, and the insulation process for the first and second evaporators begins.Open valves 23, 28, and 17. The condensate from the third and fourth evaporators enters the flash tank to produce steam. Open valves 13 and 29. The second steam jet pump pressurizes the steam and directs it into the storage tank. The condensate from the flash tank flows into the heat exchanger to exchange heat with domestic water. After heat exchange, it is discharged into the clarification tank, where it undergoes sedimentation and softening before entering the boiler. After the condensate in the third and fourth evaporators is drained, valves 23, 28, 13, and 29 are closed sequentially. Then, the next cycle of operation begins.

[0018] Preferably, the water level in the heat exchanger is maintained at 60%-70% of the total volume.

[0019] Preferably, the opening or closing of all valves is controlled by a PLC controller.

[0020] Beneficial Effects: The autoclave steam energy-saving system of this invention utilizes a steam jet pump to pressurize the residual steam in the autoclave and then use it to heat the autoclave to be steamed, thus maximizing steam utilization and reducing energy waste. The condensate from the autoclave is fed into a flash tank, where the steam from flash evaporation is pressurized by a steam jet pump and used as pre-steam for the autoclave to be steamed. The condensate after flash evaporation enters the heat exchanger tank to heat domestic water; the condensate flowing out of the heat exchanger enters a clarification tank, is clarified, and then undergoes pre-boiler water treatment before entering the boiler for reuse. Thus, the pre-pressurization and residual heat of the autoclave condensate are fully utilized. In summary, this invention maximizes the utilization of autoclave exhaust steam, fully utilizes the residual energy contained in the condensate within the autoclave, achieves water recycling, and achieves the goals of environmental protection and energy conservation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the steam energy-saving system of an autoclave according to the present invention;

[0022] The numbers in the diagram are: 100, First Evaporator; 200, Second Evaporator; 300, Third Evaporator; 400, Fourth Evaporator; 500, Heat Exchanger; 600, Clarifying Tank; 700, Flash Tank; 800, Gas Storage Tank; 900, First Steam Jet Pump; 901, Second Steam Jet Pump; 1, First Valve; 2, Second Valve; 3, Third Valve; 4, Fourth Valve; 5, Fifth Valve; 6, Sixth Valve; 7, Seventh Valve; 8, Eighth Valve; 9, Ninth Valve; 10, Tenth Valve; 11, Eleventh Valve; 12, [missing information - likely a valve name]. 12 valves, 13, 13 valves, 14, 14 valves, 15, 15 valves, 16, 16 valves, 17, 17 valves, 18, 18 valves, 19, 19 valves, 20, 20 valves, 21, 21 valves, 22, 22 valves, 23, 23 valves, 24, 24 valves, 25, 25 valves, 26, 26 valves, 27, 27 valves, 28, 28 valves, 29, 29 valves, 30, 30 valves, 31 valves. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0024] Example 1

[0025] like Figure 1As shown, an autoclave steam energy-saving system includes a main steam pipeline, a medium-pressure steam pipeline, a low-pressure steam pipeline, a first evaporator 100, a second evaporator 200, a third evaporator 300, a fourth evaporator 400, a heat exchanger 500, a clarifier 600, a flash tank 700, a gas storage tank 800, a first steam jet pump 900, and a second steam jet pump 901. The low-pressure steam pipeline is connected to the first inlet and outlet of the first evaporator 100 and the first inlet and outlet of the second evaporator 200 via branch pipes. The main steam pipeline is connected to the first inlet and outlet of the first evaporator 100, the first inlet and outlet of the second evaporator 200, the second inlet and outlet of the third evaporator 300, the second inlet and outlet of the fourth evaporator 400, and the outlet of the first steam jet pump 900 via branch pipes. The air inlet and outlet are connected to the third air inlet and outlet of the second evaporator 200, the third air inlet and outlet of the third evaporator 300, the third air inlet and outlet of the fourth evaporator 400, the air inlet of the first steam jet pump 900, and the air inlet of the second steam jet pump 901. The fourth air inlet and outlet of the first evaporator 100, the fourth air inlet and outlet of the second evaporator 200, the fourth air inlet and outlet of the third evaporator 300, and the fourth air inlet and outlet of the fourth evaporator 400 are all connected to the air inlet of the first steam jet pump 900. The condensate outlets of the first evaporator 100, the second evaporator 200, the third evaporator 300, and the fourth evaporator 400 are all connected to the inlet of the flash tank 700. The outlet of the flash tank 700 is connected to the inlet of the second steam jet pump 901. The condensate from the flash tank 700 passes through the heat exchanger 500 and the clarifier 600 in sequence before entering the boiler. The outlet of the second steam jet pump 901 is connected to the inlet of the gas storage tank 800.

[0026] The heat exchanger 500 is connected to the domestic water system and uses domestic water as the cold fluid.

[0027] The water in the aforementioned clarification tank 600 is filtered and softened before entering the boiler.

[0028] The bottoms of the flash tank 700 and heat exchanger 500 are detachable for easy cleaning.

[0029] The branch pipe connecting the aforementioned low-pressure steam pipeline to the first inlet and outlet of the first evaporator 100 is equipped with a first valve 1; the branch pipe connecting to the first inlet and outlet of the second evaporator 200 is equipped with a sixth valve 6; the branch pipe connecting to the first inlet and outlet of the third evaporator 300 is equipped with a twenty-second valve 22; the branch pipe connecting to the first inlet and outlet of the fourth evaporator 400 is equipped with a twenty-seventh valve 27; and the branch pipe connecting to the outlet of the gas storage tank 800 is equipped with a thirtieth valve 30. The branch pipe connecting the medium-pressure steam pipeline to the second inlet and outlet of the first evaporator 100 is equipped with a first valve 1; the branch pipe connecting to the second inlet and outlet of the first evaporator 100 is equipped with a sixth valve 6; the branch pipe connecting to the outlet of the gas storage tank 800 is equipped with a thirtieth valve 30; and the branch pipe connecting to the second inlet and outlet of the medium-pressure steam pipeline is equipped with a sixth valve 6. The second valve 2, the branch pipe connected to the second inlet and outlet of the second evaporator 200 is equipped with a seventh valve 7, the branch pipe connected to the second inlet and outlet of the third evaporator 300 is equipped with a nineteenth valve 19, the branch pipe connected to the second inlet and outlet of the fourth evaporator 400 is equipped with a twenty-fourth valve 24, the branch pipe connected to the third inlet and outlet of the first evaporator 100 is equipped with a third valve 3, the branch pipe connected to the third inlet and outlet of the second evaporator 200 is equipped with an eighth valve 8, and the branch pipe connected to the third inlet and outlet of the third evaporator 300 is equipped with a twenty-fourth valve 24. Valve 20 is provided with a twenty-fifth valve 25 on the branch pipe connected to the third inlet / outlet of the fourth evaporator 400; a thirty-first valve 31 is provided on the branch pipe connected to the inlet of the first steam jet pump 900; a thirteenth valve 13 is provided on the branch pipe connected to the inlet of the second steam jet pump 901; a fourth valve 4 is provided on the branch pipe connecting the fourth inlet / outlet of the first evaporator 100 to the inlet of the first steam jet pump 900; and a ninth valve 9 is provided on the branch pipe connecting the fourth inlet / outlet of the second evaporator 200 to the inlet of the first steam jet pump 900. The fourth valve 4 and the ninth valve 9 are both connected to the air inlet of the first steam jet pump 900 through a branch pipe equipped with the twelfth valve 12; the branch pipe connecting the fourth air inlet / outlet of the third evaporator 300 to the air inlet of the first steam jet pump 900 is equipped with the twenty-first valve 21; the branch pipe connecting the fourth air inlet / outlet of the fourth evaporator 400 to the air inlet of the first steam jet pump 900 is equipped with the twenty-sixth valve 26; the twenty-first valve 21 and the twenty-sixth valve 26 are both connected to the air inlet of the first steam jet pump 900 through a branch pipe equipped with the eighteenth valve 18.A fifth valve 5 is installed on the branch pipe connecting the condensate outlet of the first evaporator 100 to the inlet of the flash tank 700. A tenth valve 10 is installed on the branch pipe connecting the condensate outlet of the second evaporator 200 to the inlet of the flash tank 700. Both the fifth valve 5 and the tenth valve 10 are connected to the inlet of the flash tank 700 via a branch pipe equipped with a fifteenth valve 15. A twenty-third valve 23 is installed on the branch pipe connecting the condensate outlet of the third evaporator 300 to the inlet of the flash tank 700. A twenty-third valve 23 is installed on the branch pipe connecting the condensate outlet of the fourth evaporator 400 to the inlet of the flash tank 700. There is a 28th valve 28, and both the 23rd valve 23 and the 28th valve 28 are connected to the inlet of the flash tank 700 via a branch pipe equipped with the 17th valve 17. A 14th valve 14 is installed on the pipe connecting the outlet of the flash tank 700 to the inlet of the second steam jet pump 901. A 16th valve 16 is installed on the pipe connecting the flash tank 700 to the heat exchanger 500. An 11th valve 11 is installed on the pipe connecting the heat exchanger 500 to the clarifier 600. A 29th valve 29 is installed on the pipe connecting the outlet of the second steam jet pump 901 to the inlet of the gas storage tank 800.

[0030] Example 2

[0031] This embodiment provides the operating method of the autoclave steam energy-saving system of Embodiment 1. When the first evaporator 100 and the second evaporator 200 are used as heat-preserving vessels, and the third evaporator 300 and the fourth evaporator 400 are used as vessels to be steamed, all valves are closed. The thirtieth valve 30, the twenty-second valve 22, and the twenty-seventh valve 27 are opened to allow steam from the gas storage tank 800 to enter the third evaporator 300 and the fourth evaporator 400 respectively to preheat the vessel bodies. After preheating, the thirtieth valve 30, the first valve 22, and the sixth valve 27 are closed. After the heat preservation of the first evaporator 100 and the second evaporator 200 is completed, the second valve 2, the seventh valve 7, the nineteenth valve 19, and the twenty-fourth valve 24 are opened, allowing steam from the first evaporator 100 and the second evaporator 200 to enter the third evaporator 300 and the fourth evaporator 400 to be steamed. High-pressure steam from the second evaporator 200 is introduced into the third evaporator 300 and the fourth evaporator 400. After pressure equilibrium is reached, the second valve 2 and the seventh valve 7 are closed. The fourth valve 4, the ninth valve 9, the twelfth valve 12, and the thirty-first valve 31 are opened, and the first steam jet pump 900 starts working, introducing the residual steam from the first evaporator 100 and the second evaporator 200 into the third evaporator 300 and the fourth evaporator 400. After completion, the thirty-first valve 31, the twelfth valve 12, the nineteenth valve 19, and the twenty-fourth valve 24 are closed in sequence. The twentieth valve 20 and the twenty-fifth valve 25 are opened to replenish steam to the third evaporator 300 and the fourth evaporator 400. After the working pressure is reached, the twentieth valve 20 and the twenty-fifth valve 25 are closed. Door 25, the third evaporator 300 and the fourth evaporator 400 begin heat preservation; the fifth valve 5, the tenth valve 10 and the fifteenth valve 15 are opened, and the condensate in the first evaporator 100 and the second evaporator 200 enters the flash tank 700 to flash steam. The thirteenth valve 13, the fourteenth valve 14 and the twenty-ninth valve 29 are opened, and the second steam jet pump 901 pressurizes the steam and introduces it into the storage tank 800. At the same time, the eleventh valve 11 and the sixteenth valve 16 are opened, and the condensate produced in the flash tank 700 flows into the heat exchanger 500 to exchange heat with domestic water. After heat exchange, it is discharged into the clarification tank 600, and after sedimentation and softening treatment, it enters the boiler; after the condensate in the first evaporator 100 and the second evaporator 200 is drained, the process proceeds sequentially... Close valves 5, 10, 13, and 29. At this time, the first evaporator 100 and the second evaporator 200 become the vessels to be steamed. Open valves 30, 1, and 6 to allow steam in the gas storage tank 800 to enter the first evaporator 100 and the second evaporator 200 respectively to preheat the vessel bodies. After the pressure is balanced, close valves 30, 1, and 6. Open valves 19, 24, 2, and 7 to introduce high-pressure steam from the third evaporator 300 and the fourth evaporator 400 into the first evaporator 100 and the second evaporator 200. After the pressure is balanced, close valves 19 and 24.Open valves 26, 21, 18, and 31. The first steam jet pump 900 starts working, introducing residual steam from the third evaporator 300 and the fourth evaporator 400 into the first evaporator 100 and the second evaporator 200. After completion, close valves 31, 18, 2, and 7 in sequence. Open valves 3 and 8 to replenish steam to the third evaporator 300 and the fourth evaporator 400. After reaching the working pressure, close valves 3 and 8. The first evaporator 100 and the second evaporator 200 begin heat preservation. Open valves 23 and 28. The condensate from valves 28 and 17, and from the third and fourth evaporators 300, enters the flash tank 700 to flash steam. Valve 13 and valve 29 are then opened, and the second steam jet pump 901 pressurizes the steam before introducing it into the storage tank 800. The condensate from the flash tank 700 flows into the heat exchanger 500 to exchange heat with domestic water. After heat exchange, it is discharged into the clarifier 600, where it undergoes sedimentation and softening before entering the boiler. After the condensate in the third and fourth evaporators 300 is drained, valves 23, 28, 13, and 29 are closed sequentially. Then, the next cycle of operation begins.

[0032] The water level in the heat exchanger 500 is maintained at 60%-70% of the total volume of the heat exchanger 500.

[0033] The opening and closing of all valves are controlled by a PLC controller, realizing the automatic control of the system of this invention.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An autoclave steam energy saving system, characterized by: The system comprises a main steam pipeline, a medium-pressure steam pipeline, a low-pressure steam pipeline, a first evaporation kettle (100), a second evaporation kettle (200), a third evaporation kettle (300), a fourth evaporation kettle (400), a heat exchanger (500), a clarifier (600), a flash tank (700), a gas storage tank (800), a first steam jet pump (900) and a second steam jet pump (901), The low-pressure steam pipeline is connected with the first inlet and outlet of the first evaporation kettle (100), the first inlet and outlet of the second evaporation kettle (200), the first inlet and outlet of the third evaporation kettle (300), the first inlet and outlet of the fourth evaporation kettle (400) and the gas outlet of the gas storage tank (800) through branch pipes respectively, The medium-pressure steam pipeline is connected with the second inlet and outlet of the first evaporation kettle (100), the second inlet and outlet of the second evaporation kettle (200), the second inlet and outlet of the third evaporation kettle (300), the second inlet and outlet of the fourth evaporation kettle (400) and the gas outlet of the first steam jet pump (900) through branch pipes respectively, The main steam pipeline is connected with the third inlet and outlet of the first evaporation kettle (100), the third inlet and outlet of the second evaporation kettle (200), the third inlet and outlet of the third evaporation kettle (300), the third inlet and outlet of the fourth evaporation kettle (400), the gas inlet of the first steam jet pump (900) and the gas inlet of the second steam jet pump (901) through branch pipes respectively, The fourth inlet and outlet of the first evaporation kettle (100), the fourth inlet and outlet of the second evaporation kettle (200), the fourth inlet and outlet of the third evaporation kettle (300) and the fourth inlet and outlet of the fourth evaporation kettle (400) are connected with the gas inlet of the first steam jet pump (900), the condensate outlets of the first evaporation kettle (100), the second evaporation kettle (200), the third evaporation kettle (300) and the fourth evaporation kettle (400) are connected with the water inlet of the flash tank (700), the gas outlet of the flash tank (700) is connected with the inlet of the second steam jet pump (901), the condensate of the flash tank (700) enters the boiler after passing through the heat exchanger (500) and the clarifier (600) in sequence, and the outlet of the second steam jet pump (901) is connected with the gas inlet of the gas storage tank (800).

2. The steam energy saving system for an autoclave according to claim 1, characterized by: The heat exchanger (500) is connected with a domestic water system, and domestic water is used as the cold fluid.

3. The steam energy saving system for an autoclave according to claim 1, characterized in that: The water in the clarifier (600) is filtered and softened before entering the boiler.

4. The steam energy saving system for an autoclave according to claim 1, characterized by: The bottoms of the flash tank (700) and the heat exchanger (500) are detachable.

5. The steam energy saving system for an autoclave according to claim 1, characterized in that: The low-pressure steam pipeline is provided with a first valve (1) on the branch pipe connected with the first inlet and outlet of the first evaporation kettle (100), a sixth valve (6) on the branch pipe connected with the first inlet and outlet of the second evaporation kettle (200), a twenty-second valve (22) on the branch pipe connected with the first inlet and outlet of the third evaporation kettle (300), a twenty-seventh valve (27) on the branch pipe connected with the first inlet and outlet of the fourth evaporation kettle (400), and a thirtieth valve (30) on the branch pipe connected with the gas outlet of the gas storage tank (800), The medium-pressure steam pipeline is provided with a second valve (2) on the branch pipe connected with the second inlet and outlet of the first evaporation kettle (100), a seventh valve (7) on the branch pipe connected with the second inlet and outlet of the second evaporation kettle (200), a nineteenth valve (19) on the branch pipe connected with the second inlet and outlet of the third evaporation kettle (300), and a twenty-fourth valve (24) on the branch pipe connected with the second inlet and outlet of the fourth evaporation kettle (400), The main steam pipeline is provided with a third valve (3) on the branch pipe connected with the third inlet and outlet of the first evaporation kettle (100), an eighth valve (8) on the branch pipe connected with the third inlet and outlet of the second evaporation kettle (200), a twentieth valve (20) on the branch pipe connected with the third inlet and outlet of the third evaporation kettle (300), a twenty-fifth valve (25) on the branch pipe connected with the third inlet and outlet of the fourth evaporation kettle (400), a thirty-first valve (31) on the branch pipe connected with the gas inlet of the first steam jet pump (900), and a thirteenth valve (13) on the branch pipe connected with the gas inlet of the second steam jet pump (901), The fourth inlet and outlet gas port of the first evaporation kettle (100) is connected with the inlet gas port of the first steam jet pump (900) through a branch pipe provided with a fourth valve (4), the fourth inlet and outlet gas port of the second evaporation kettle (200) is connected with the inlet gas port of the first steam jet pump (900) through a branch pipe provided with a ninth valve (9), the fourth valve (4) and the ninth valve (9) are connected with the inlet gas port of the first steam jet pump (900) through a branch pipe provided with a twelfth valve (12); the fourth inlet and outlet gas port of the third evaporation kettle (300) is connected with the inlet gas port of the first steam jet pump (900) through a branch pipe provided with a twenty-first valve (21), the fourth inlet and outlet gas port of the fourth evaporation kettle (400) is connected with the inlet gas port of the first steam jet pump (900) through a branch pipe provided with a twenty-sixth valve (26), the twenty-first valve (21) and the twenty-sixth valve (26) are connected with the inlet gas port of the first steam jet pump (900) through a branch pipe provided with an eighteenth valve (18); the condensed water outlet of the first evaporation kettle (100) is connected with the water inlet of the flash tank (700) through a branch pipe provided with a fifth valve (5), the condensed water outlet of the second evaporation kettle (200) is connected with the water inlet of the flash tank (700) through a branch pipe provided with a tenth valve (10), the fifth valve (5) and the tenth valve (10) are connected with the water inlet of the flash tank (700) through a branch pipe provided with a fifteenth valve (15), the condensed water outlet of the third evaporation kettle (300) is connected with the water inlet of the flash tank (700) through a branch pipe provided with a twenty-third valve (23), the condensed water outlet of the fourth evaporation kettle (400) is connected with the water inlet of the flash tank (700) through a branch pipe provided with a twenty-eighth valve (28), the twenty-third valve (23) and the twenty-eighth valve (28) are connected with the water inlet of the flash tank (700) through a branch pipe provided with a seventeenth valve (17), the gas outlet of the flash tank (700) is connected with the inlet of the second steam jet pump (901) through a pipeline provided with a fourteenth valve (14), the flash tank (700) is connected with the heat exchanger (500) through a pipeline provided with a sixteenth valve (16), the heat exchanger (500) is connected with the clarification tank (600) through a pipeline provided with an eleventh valve (11); the outlet of the second steam jet pump (901) is connected with the gas inlet of the gas storage tank (800) through a pipeline provided with a twenty-ninth valve (29).

6. The method of claim 5, wherein the method comprises: When the first evaporation kettle (100) and the second evaporation kettle (200) are used as heat preservation kettles, and the third evaporation kettle (300) and the fourth evaporation kettle (400) are used as kettles to be evaporated, all the valves are in the closed state; the thirtieth valve (30), the twenty-second valve (22) and the twenty-seventh valve (27) are opened, so that the steam in the gas storage tank (800) enters the third evaporation kettle (300) and the fourth evaporation kettle (400) to preheat the kettle bodies; after preheating, the thirtieth valve (30), the twenty-second valve (22) and the twenty-seventh valve (27) are closed; the second valve (2), the seventh valve (7), the nineteenth valve (19) and the twenty-fourth valve (24) are opened, and the high-pressure steam in the first evaporation kettle (100) and the second evaporation kettle (200) is introduced into the third evaporation kettle (300) and the fourth evaporation kettle (400); after pressure balance, the second valve (2) and the seventh valve (7) are closed; the fourth valve (4), the ninth valve (9), the twelfth valve (12) and the thirty-first valve (31) are opened, and the first steam jet pump (900) starts to work, so that the residual steam in the first evaporation kettle (100) and the second evaporation kettle (200) is introduced into the third evaporation kettle (300) and the fourth evaporation kettle (400); after the work is finished, the thirty-first valve (31), the twelfth valve (12), the nineteenth valve (19) and the twenty-fourth valve (24) are sequentially closed; the twentieth valve (20) and the twenty-fifth valve (25) are opened to supply steam to the third evaporation kettle (300) and the fourth evaporation kettle (400); after the working pressure is reached, the twentieth valve (20) and the twenty-fifth valve (25) are closed, and the third evaporation kettle (300) and the fourth evaporation kettle (400) start to be heat preserved; the fifth valve (5), the tenth valve (10) and the fifteenth valve (15) are opened, and the condensed water in the first evaporation kettle (100) and the second evaporation kettle (200) enters the flash tank (700) to flash out steam; the thirteenth valve (13), the fourteenth valve (14) and the twenty-ninth valve (29) are opened, and the second steam jet pump (901) introduces the steam into the gas storage tank (800) after increasing the pressure of the steam; at the same time, the eleventh valve (11) and the sixteenth valve (16) are opened, and the condensed water generated by the flash tank (700) flows into the heat exchanger (500) to exchange heat with domestic water; after heat exchange, the condensed water is discharged into the clarifier (600) and then enters the boiler after softening treatment by sedimentation; after the condensed water in the first evaporation kettle (100) and the second evaporation kettle (200) is discharged, the fifth valve (5), the tenth valve (10), the thirteenth valve (13) and the twenty-ninth valve (29) are sequentially closed;At this time, the first evaporation kettle (100) and the second evaporation kettle (200) become the kettle to be evaporated, the thirtieth valve (30), the first valve (1) and the sixth valve (6) are opened, the steam in the gas storage tank (800) is respectively introduced into the first evaporation kettle (100) and the second evaporation kettle (200) to preheat the kettle body, after pressure balance, the thirtieth valve (30), the first valve (1) and the sixth valve (6) are closed; the nineteenth valve (19), the twenty-fourth valve (24), the second valve (2) and the seventh valve (7) are opened, the high-pressure steam in the third evaporation kettle (300) and the fourth evaporation kettle (400) is introduced into the first evaporation kettle (100) and the second evaporation kettle (200), when the pressure is balanced, the nineteenth valve (19) and the twenty-fourth valve (24) are closed; the twenty-sixth valve (26), the twenty-first valve (21), the eighteenth valve (18) and the thirty-first valve (31) are opened, the first steam jet pump (900) starts to work, the residual steam in the third evaporation kettle (300) and the fourth evaporation kettle (400) is introduced into the first evaporation kettle (100) and the second evaporation kettle (200), after the end, the thirty-first valve (31), the eighteenth valve (18), the second valve (2) and the seventh valve (7) are closed in turn; the third valve (3) and the eighth valve (8) are opened to supply steam for the third evaporation kettle (300) and the fourth evaporation kettle (400), after reaching the working pressure, the third valve (3) and the eighth valve (8) are closed, the first evaporation kettle (100) and the second evaporation kettle (200) are heated and start; the twenty-third valve (23), the twenty-eighth valve (28) and the seventeenth valve (17) are opened, the condensed water generated by the third evaporation kettle (300) and the fourth evaporation kettle (400) is introduced into the flash tank (700) to flash out steam, the thirteenth valve (13) and the twenty-ninth valve (29) are opened, the second steam jet pump (901) introduces the steam into the gas storage tank (800) after increasing the pressure, the condensed water generated by the flash tank (700) flows into the heat exchanger (500) to exchange heat with domestic water, after heat exchange, it is discharged into the clarifier (600), after softening treatment by precipitation, it enters the boiler; after the condensed water in the third evaporation kettle (300) and the fourth evaporation kettle (400) is emptied, the twenty-third valve (23), the twenty-eighth valve (28), the thirteenth valve (13) and the twenty-ninth valve (29) are closed in turn; then the next round of work is started.

7. The working method of the steam energy-saving system of the autoclave according to claim 6, characterized in that: The water level in the heat exchanger (500) is maintained at 60%-70% of the total volume.

8. The working method of the steam energy-saving system of the autoclave according to claim 6, characterized in that: The opening and closing of all valves are controlled by a PLC controller.

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