A system for recovering waste steam working fluid and heat and producing low-pressure steam.

Abstract

This utility model discloses a system for recovering waste steam refrigerant and heat to produce low-pressure steam. It includes a steam utilization point, a water jet ejector, a water collection tank, an evaporator, a compressor, a condenser, a feedwater pump, a flash tank, a steam-water separator, and a steam compressor. The system recovers the discharged low-pressure waste steam via the water jet ejector. Then, the low-grade heat from the mixture of waste steam and driving water is used to raise the temperature of the refrigerant in the evaporator. After further heating by the compressor, the heat is transferred to the feedwater through the condenser. Flash evaporation technology is used to instantly vaporize the high-temperature feedwater at low pressure, producing clean saturated steam. Finally, the high-temperature feedwater is converted into low-pressure steam for reuse. Furthermore, the steam compressor is used to raise the temperature and pressure of the saturated steam, allowing the negative-pressure saturated steam containing droplets after flash evaporation to be pressurized into low-pressure saturated steam after passing through the steam-water separator. This forms a closed-loop system where each unit is coupled and works collaboratively, resulting in stable operation and a high degree of automation. This system converts waste steam into steam while simultaneously achieving energy savings.

Description

Technical Field

[0001] This utility model relates to the field of energy-efficient utilization technology, and in particular to a system for recovering waste steam working fluid and heat and producing low-pressure steam. Background Technology

[0002] In industrial production, such as thermal power, petrochemical, textile, food, and papermaking industries, a large number of processes require the use of steam. As a commonly used energy medium, steam generates a large amount of waste steam after heat exchange is completed at steam-using points (such as printing and dyeing, papermaking, and chemical drying processes).

[0003] These exhaust steams are usually emitted directly into the air, but due to the instability or even discontinuity of exhaust steam emissions, recovery is difficult. Most of the exhaust steam can only be emitted into the air, and the water vapor working fluid contained in the exhaust steam is not recovered, and the latent heat and sensible heat of vaporization carried by the exhaust steam are directly lost, resulting in a great waste of resources and energy and thermal pollution to the environment.

[0004] Currently, the main technical challenges facing exhaust steam recovery are the dispersed emission points, low pressure (often slightly positive or atmospheric pressure), and unstable or even discontinuous flow rates. Common recovery methods include direct condensation heat exchange, which often only recovers a portion of the sensible heat, while the latent heat and all working fluid cannot be effectively recovered. Alternatively, large-scale, high-energy-consuming mechanical vapor recompression systems are used, which have high investment and operating costs and are difficult to promote and apply in small and medium-sized exhaust steam emission scenarios.

[0005] Therefore, a new technical solution needs to be researched to address the above problems. Utility Model Content

[0006] In view of this, the present invention addresses the deficiencies of the existing technology and its main purpose is to provide a system for recovering waste steam working fluid and heat and producing low-pressure steam. Through the mutual coupling and synergistic cooperation between various components, the waste steam is converted into steam, reducing the consumption of fresh steam and water replenishment costs, thereby reducing production costs and achieving energy saving.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A system for recovering waste steam working fluid and heat and producing low-pressure steam is characterized by comprising: a steam utilization point, a water ejector, a water collection tank, an evaporator, a compressor, a condenser, a feed water pump, a flash tank, a steam-water separator, and a steam compressor;

[0009] The exhaust steam outlet of the steam consumption point is connected to the exhaust steam inlet of the water jet ejector via a main pipe; the outlet of the water collection tank is connected to the cooled side inlet of the evaporator via a circulating pump; the cooled side outlet of the evaporator is connected to the drive water inlet of the water jet ejector.

[0010] The refrigerant outlet of the evaporator is connected to the inlet of the compressor, the outlet of the compressor is connected to the refrigerant inlet of the condenser, and the refrigerant outlet of the condenser is connected to the refrigerant inlet of the evaporator; the heated water outlet of the condenser is connected to the feed water inlet of the flash tank; the unvaporized feed water outlet at the bottom of the flash tank is connected to the heated water inlet of the condenser via a feed water pump; the steam outlet at the top of the flash tank is connected to the inlet of the steam-water separator, the steam outlet of the steam-water separator is connected to the inlet of the steam compressor, and the outlet of the steam compressor is connected to the steam inlet of the steam consumption point via a steam delivery pipeline.

[0011] As a preferred embodiment, the unvaporized feedwater outlet of the flash tank is connected to the feedwater pump via a connecting pipe, so that the unvaporized feedwater is sent back into the flash tank after being pumped by the feedwater pump, forming a circulation loop.

[0012] As a preferred embodiment, the water collection tank is equipped with a water supply pipe, an overflow pipe, and a water discharge pipe. The outlet of the water collection tank is connected to the inlet of the circulating pump through the water supply pipe. When the volume of water in the water collection tank exceeds the interface of the overflow pipe, the water in the water collection tank automatically overflows.

[0013] As a preferred embodiment, the refrigerant outlet of the condenser is connected to the refrigerant inlet of the evaporator via a throttling valve.

[0014] As a preferred embodiment, the system for recovering waste steam working fluid and heat and producing low-pressure steam further includes a makeup water tank, the outlet of which is connected to the feed water pump via a connecting pipe.

[0015] As a preferred embodiment, the outlet of the steam compressor is connected to a pressure stabilizing tank, and the outlet of the pressure stabilizing tank is connected to the steam inlet of the steam consumption point via a steam delivery pipeline.

[0016] As a preferred embodiment, multiple sets of steam consumption points are provided, and all sets of steam consumption points are connected to the exhaust steam inlet of the water jet steam extractor through a main pipe.

[0017] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it mainly recovers the low-pressure exhaust steam by using a water jet ejector. Utilizing the Venturi principle, the circulating water, pressurized by the circulating pump and releasing heat in the evaporator, is injected into the water jet ejector with residual pressure, creating a -10kPa micro-negative pressure environment at the throat. The low-pressure exhaust steam released from the steam point enters the water jet ejector through the main pipe under the action of micro-negative pressure, achieving heat and mass mixing with the circulating water, thus realizing the purpose of recovering the exhaust steam working fluid and heat.

[0018] Secondly, by utilizing the setup of the evaporator, compressor, and condenser, the low-grade heat from the mixture of exhaust steam and driving water is used. Through the refrigerant's heat absorption, compression enthalpy increase, and heat release processes, the refrigerant absorbs heat from the heated circulating water in the evaporator, increasing its temperature and converting it into high-grade heat energy for the feed water in the condenser, thus achieving heat transfer across temperature zones. The compressor further increases the refrigerant temperature, and after this further heating, the heat is transferred to the feed water through the condenser, converting the high-temperature feed water into low-pressure steam for reuse.

[0019] Next, flash evaporation technology is used to instantly vaporize high-temperature feedwater under low pressure, generating clean saturated steam. The suction at the inlet of the steam compressor creates a negative pressure environment in the flash tank, lower than the saturation pressure corresponding to the feedwater temperature (the saturation temperature at this pressure is 5-10°C lower than the feedwater temperature). When the high-temperature feedwater enters the flash tank, the pressure drop causes the feedwater temperature to exceed the saturation temperature corresponding to the pressure inside the flash tank, resulting in flash evaporation.

[0020] Another method utilizes a steam compressor to raise the temperature and pressure of saturated steam. This allows the negative-pressure saturated steam containing droplets after flash evaporation, processed by a steam-water separator, to be pressurized into low-pressure saturated steam. Under the suction at the inlet of the steam compressor, the saturated steam enters the compressor. By inputting electrical energy, the steam undergoes mechanical work, increasing its temperature and pressure to meet the steam quality requirements of the production process. The heated and pressurized steam is then transported through pipelines to various steam-consuming points, forming a closed-loop system. The various units are coupled and work collaboratively, ensuring stable operation and a high degree of automation. This method converts waste steam into steam, directly reducing the factory's fresh steam consumption and water replenishment costs, lowering production costs, and simultaneously achieving energy conservation.

[0021] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0022] Figure 1 This is a flowchart illustrating an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached diagram:

[0024] 1. Steam point 2. Water injection steam extractor

[0025] 11. Exhaust steam outlet 12. Steam inlet

[0026] 13" Mother tube

[0027] 21. Exhaust steam inlet 22. Water outlet

[0028] 23. Drive water inlet

[0029] 3. Water collection tank 4. Circulation pump

[0030] 5. Evaporator 6. Compressor

[0031] 7. Throttling valve 8. Condenser

[0032] 9. Water supply pump 10. Water supply tank

[0033] 11. Flash evaporator 12. Steam separator

[0034] 13. Steam compressor 14. Pressure stabilizing tank. Detailed Implementation

[0035] Please refer to Figure 1 As shown, it illustrates the specific structure of an embodiment of the present invention.

[0036] In the description of this utility model, it should be noted that the directional terms such as "up", "down", "front", "back", "left", and "right" indicate the orientation and positional relationship based on the accompanying drawings or the orientation or positional relationship shown when wearing and using the device normally. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0037] A system for recovering waste steam working fluid and heat and producing low-pressure steam includes a useful steam point 1, a water jet ejector 2, a water collection tank 3, an evaporator 5, a compressor 6, a condenser 8, a feed water pump 9, a flash tank 11, a steam-water separator 12, and a steam compressor 13.

[0038] A slightly negative pressure environment is established by the water jet steam ejector 2 to efficiently extract the exhaust steam from the dispersed steam consumption point 1, thereby realizing the recovery of the working fluid. The refrigeration cycle consisting of the evaporator 5, compressor 6, and condenser 8 is used to convert the low-grade heat of the exhaust steam into feedwater heat energy to provide energy for subsequent flash evaporation. The flash tank 11, combined with the steam-water separator 12 and the steam compressor 13, accurately produces and improves low-pressure steam, forming a closed loop from exhaust steam recovery to heat conversion and then to steam regeneration, which greatly improves the energy efficiency of the steam system. In typical scenarios (such as textile printing and dyeing), it can reduce the energy consumption of steam preparation.

[0039] The steam consumption point 1 is provided with a waste steam outlet 11" and a steam inlet 12"; the water jet ejector 2 is provided with a waste steam inlet 21, a water outlet 22 and a driving water inlet 23; the evaporator 5 is provided with a cooled side inlet and a cooled side outlet; the condenser 8 is provided with a refrigerant inlet and a refrigerant outlet; and the outlet of the water collection tank 3 is connected to the cooled side inlet of the evaporator 5.

[0040] The exhaust steam outlet 11" of the steam consumption point 1 is connected to the exhaust steam inlet 21 of the water jet steam ejector 2 via a main pipe 13". Preferably, multiple sets of steam consumption points 1 are provided, and all sets of steam consumption points 1 are connected to the exhaust steam inlet 21 of the water jet steam ejector 2 via a main pipe 13". For example, there are multiple sets of steam consumption points 1 in an industrial plant area (such as a textile industrial park) (such as multiple dryers and setting machines in a dyeing and printing workshop). The dispersed exhaust steam (with different pressures and flow rates) is collected by the main pipe 13" and sent to the water jet steam ejector 2. The working fluid and heat can be recovered in a centralized manner, avoiding the high cost (equipment investment and operation and maintenance) of individual equipment recovery (such as each unit being equipped with a small condenser 8).

[0041] The outlet of the water collection tank 3 is connected to the inlet of the evaporator 5 on the cooled side via the circulation pump 4; preferably, the water collection tank 3 is provided with a water supply pipe, an overflow pipe and a water discharge pipe, and the outlet of the water collection tank 3 is connected to the inlet of the circulation pump 4 via the water supply pipe; when the volume of water in the water collection tank 3 exceeds the interface of the overflow pipe, the water in the water collection tank 3 automatically overflows.

[0042] To ensure stable drive water circulation, the water collection tank 3 serves as the drive water storage and distribution unit. The water supply pipe replenishes water lost from the system (such as leakage from the water jet ejector 2 or indirect water loss during flash evaporation), ensuring sufficient water supply at the inlet of the circulating pump 4. This prevents a decrease in the suction capacity of the water jet ejector 2 due to water shortage (resulting in the inability to establish a slight negative pressure and a sharp reduction in the amount of waste steam recovered). The overflow pipe and drain pipe work together to control the liquid level in the water collection tank 3, preventing overflow caused by excessive water supply (such as a malfunction of the automatic water supply valve) or water quality issues due to long-term accumulation of impurities (regular water draining and cleaning). During industrial steam consumption, the amount of waste steam at steam consumption point 1 fluctuates with the load (such as changes in the speed of the paper machine). The water supply pipe can flexibly replenish water to maintain the liquid level in the water collection tank 3. The overflow pipe automatically drains excess water to balance the increase in water volume caused by sudden changes in the amount of waste steam (such as simultaneous exhaust from multiple devices).

[0043] The cooled side outlet of the evaporator 5 is connected to the drive water inlet 23 of the water ejector 2; the refrigerant outlet of the evaporator 5 is connected to the inlet of the compressor 6. The high-temperature and high-pressure refrigerant gas from the heat pump compressor flows in the tube side (or shell side) of the condenser, releasing heat to the feed water flowing in the shell side (or tube side). The refrigerant itself condenses into a liquid due to cooling, while the feed water is heated to a higher temperature (usually 40-50°C, reaching close to or exceeding 100°C).

[0044] Preferably, the refrigerant outlet of the condenser 8 is connected to the refrigerant inlet of the evaporator 5 via a throttling valve. This valve efficiently transfers the low-grade heat extracted from the exhaust vapor by the evaporator, compressor, condenser, and throttling valve to the flash tank through the refrigerant condensation heat release process. During the refrigeration cycle, the high-pressure refrigerant discharged from the condenser 8 is depressurized and cooled by the throttling valve, becoming a low-temperature, low-pressure liquid. This liquid then enters the evaporator 5 to more efficiently absorb heat from the driving water. Compared to a direct-flow system without a throttling valve, the throttling valve allows the refrigerant to absorb heat more fully in the evaporator 5. The improved refrigeration cycle efficiency indirectly enhances the heating capacity of the condenser 8 for feedwater, providing more heat for the flash evaporation stage. Secondly, by adjusting the opening of the throttle valve, the refrigerant flow rate and the evaporation temperature of the evaporator 5 can be controlled. When the demand of steam point 1 changes (such as the steam pressure needs to be adjusted from 0.3MPa to 0.25MPa), the throttle valve is adjusted in conjunction with the condenser 8 to change the heat release power, adapting to the demand of flash tank 11 for feedwater temperature and heat, so that the low-pressure steam parameters (pressure and temperature) can be adjusted as needed to meet the process requirements of steam point 1.

[0045] The outlet of the compressor 6 is connected to the refrigerant inlet of the condenser 8, and the refrigerant outlet of the condenser 8 is connected to the refrigerant inlet of the evaporator 5; the heated water outlet of the condenser 8 is connected to the water supply inlet of the flash tank 11; the water supply pump 9 provides pressure for the unvaporized water coming out of the flash tank, overcomes the resistance of pipelines, valves and equipment, and delivers it to the higher-positioned flash tank, ensuring that the water entering the flash tank has sufficient pressure.

[0046] Preferably, the unvaporized water outlet of the flash tank 11 is connected to the water pump 9 through a connecting pipe, so that the unvaporized water is sent back into the flash tank 11 after passing through the water pump 9, forming a circulation loop. Inside the flash tank 11, during the flash evaporation of high-temperature feedwater under negative pressure, there is unvaporized feedwater (still containing a large amount of sensible heat). This unvaporized feedwater is connected to the feedwater pump 9 through the unvaporized feedwater outlet, allowing it to re-participate in heat exchange and preventing heat from being idle. For example, after flash evaporation of 100°C feedwater, the temperature of the unvaporized water is about 90°C. It can be recycled to continue absorbing heat from the condenser 8 (such as raising the temperature to 100°C), improving flash evaporation efficiency. The circulating flow makes the water temperature and level in the flash tank 11 more uniform, reducing local overcooling or overheating. When the load of the steam consumption point 1 fluctuates (such as the start and stop of the dyeing machine), and the feedwater flow and temperature change, the circulation loop can buffer and adjust to ensure the stability of the negative pressure flash evaporation environment in the flash tank 11, avoiding large fluctuations in steam output and quality, and ensuring a continuous and stable supply of low-pressure steam to the steam consumption point 1.

[0047] The top steam outlet of the flash tank 11 is connected to the inlet of the steam-water separator 12, the steam outlet of the steam-water separator 12 is connected to the inlet of the steam compressor 13, and the outlet of the steam compressor 13 is connected to the steam inlet 12″ of the steam point 1 through a steam delivery pipeline.

[0048] Preferably, the outlet of the steam compressor 13 is connected to a pressure stabilizing tank 14, and the outlet of the pressure stabilizing tank 14 is connected to the steam inlet 12" of the steam consumption point 1 via a steam delivery pipeline. The pressure stabilizing tank 14 acts as a pressure buffer, and its internal air chamber can absorb fluctuating pressure, allowing the pressure in the steam delivery pipeline to change smoothly.

[0049] Preferably, the system for recovering waste steam working fluid and heat to produce low-pressure steam further includes a water replenishment tank 10. The outlet of the water replenishment tank 10 is connected to the feed water pump 9 via a connecting pipe. During flash evaporation, the feed water turns into steam, which leads to a reduction in the system water volume (e.g., 1 t of water flashes to produce 0.1 t of steam, resulting in a water loss of 0.1 t). The water replenishment tank 10 is directly connected to the feed water pump 9, which can replenish this water in real time to maintain the water level and temperature in the flash tank 11. For example, in a continuous chemical reaction process, the water replenishment tank 10 replenishes water according to the water loss rate to ensure continuous steam production in the flash tank 11, avoiding flash evaporation interruption and steam pressure drop due to water shortage, thus stabilizing the operating conditions of the steam consumption point 1 (e.g., reactor heating) and improving product quality consistency.

[0050] The general working process of this embodiment is described in detail below:

[0051] The system is mainly divided into four parts:

[0052] In the first stage, a water jet ejector 2 is used to recover the discharged low-pressure exhaust steam. The exhaust steam released from each steam use point 1 is collected through the main pipe 13" and then connected to the water jet ejector 2. Utilizing the Venturi principle, the circulating water, pressurized by the circulating pump 4 and releasing heat in the evaporator 5, is injected into the water jet ejector 2 with residual pressure, creating a slight negative pressure environment of about -10 kPa at the throat. The low-pressure exhaust steam released from the steam use point 1 enters the water jet ejector 2 under the action of the slight negative pressure through the main pipe 13" and mixes with the circulating water in terms of heat and mass. After the circulating water and exhaust steam undergo heat and mass transfer and mixing, the temperature rises (by about 10°C) and is stored in the water collection tank 3 as a heat source for the next stage.

[0053] The second stage employs heat pump technology to transfer the heat from the circulating water heated in the previous stage to the water supply system, thereby increasing the water temperature in the supply system (by 5-10°C, compared to a 40-50°C increase in temperature compared to the heat source). This stage achieves heat transfer and temperature increase through the circulation of refrigerant.

[0054] First, the refrigerant absorbs heat from the circulating water after the previous heating process in the evaporator 5, causing its temperature to rise. Then, the refrigerant temperature is further increased by the compression work of the compressor 6. Subsequently, the refrigerant releases heat in the condenser 8 and is pressurized by the feed water pump 9 before being delivered to the flash tank 11. After releasing heat, the refrigerant expands through the expansion valve, causing its temperature to drop, and then enters the evaporator 5 to begin the second cycle of heat absorption.

[0055] In the third stage, flash evaporation technology is used. Utilizing the principle that the boiling point of water decreases with decreasing pressure, the feedwater, pressurized by the feedwater pump 9 and absorbing heat in the condenser 8, experiences a pressure reduction in the flash tank 11, resulting in partial vaporization and the generation of steam. The suction at the inlet of the steam compressor 13 creates a negative pressure environment in the flash tank 11 below the saturation pressure corresponding to the feedwater temperature (the saturation temperature corresponding to this pressure is 5-10℃ lower than the feedwater temperature). When the high-temperature feedwater enters the flash tank 11, due to the pressure reduction, the feedwater temperature is higher than the saturation temperature corresponding to the pressure inside the flash tank 11, causing flash evaporation. Part of the feedwater vaporizes and, carrying droplets, enters the steam-water separator 12 in the form of saturated steam for steam-water separation. The remaining unvaporized feedwater, having lost heat due to flash vaporization, decreases in temperature and continues to be pressurized by the feedwater pump 9 to begin the second cycle of heat absorption. The water lost due to the steam generated by flash evaporation is replenished through the water supply tank 10.

[0056] In the fourth stage, steam compression technology is used to heat and pressurize saturated steam using steam compressor 13. After the saturated steam containing droplets is separated by steam-water separator 12, dry saturated steam is obtained. Under the suction at the inlet of steam compressor 13, the saturated steam enters steam compressor 13. By inputting electrical energy, the steam compressor 13 performs mechanical work to increase the steam temperature and pressure, meeting the steam quality requirements of the production process. After being heated and pressurized, the steam compressor 13 is buffered by pressure stabilizing tank 14 and then transported to each steam consumption point 1 through pipelines.

[0057] The key design feature of this invention is that it recovers the low-pressure exhaust steam by using a water jet ejector. Utilizing the Venturi principle, the circulating water, pressurized by a circulating pump and releasing heat in the evaporator, is injected into the water jet ejector with residual pressure, creating a -10 kPa micro-negative pressure environment at the throat. The low-pressure exhaust steam released from the steam point enters the water jet ejector through the main pipe under the action of micro-negative pressure, where it mixes with the circulating water to achieve the purpose of recovering the exhaust steam working fluid and heat.

[0058] Secondly, by utilizing the setup of the evaporator, compressor, and condenser, the low-grade heat from the mixture of exhaust steam and driving water is used. Through the refrigerant's heat absorption, compression enthalpy increase, and heat release processes, the refrigerant absorbs heat from the heated circulating water in the evaporator, raising its temperature and converting it into high-grade heat energy for the feed water in the condenser, thus achieving heat transfer across temperature zones. Through the compressor's compression work, the refrigerant temperature is further increased. After being further heated by the compressor, the heat is transferred to the feed water through the condenser, converting the high-temperature feed water into low-pressure steam for reuse.

[0059] Next, flash evaporation technology is used to instantly vaporize high-temperature feedwater under low pressure to generate clean saturated steam. Through the suction at the inlet of the steam compressor, the flash tank generates a negative pressure environment that is lower than the saturation pressure corresponding to the feedwater temperature (the saturation temperature corresponding to this pressure is 5-10℃ lower than the feedwater temperature). When the high-temperature feedwater enters the flash tank, due to the pressure reduction, the temperature of the feedwater is higher than the saturation temperature corresponding to the pressure inside the flash tank, and the flash evaporation phenomenon occurs.

[0060] Another method utilizes a steam compressor to raise the temperature and pressure of saturated steam. This allows the negative-pressure saturated steam containing droplets after flash evaporation, processed by a steam-water separator, to be pressurized into low-pressure saturated steam. Under the suction at the inlet of the steam compressor, the saturated steam enters the compressor. By inputting electrical energy, the steam undergoes mechanical work, increasing its temperature and pressure to meet the steam quality requirements of the production process. The heated and pressurized steam is then transported through pipelines to various steam-consuming points, forming a closed-loop system. The various units are coupled and work collaboratively, ensuring stable operation and a high degree of automation. This method converts waste steam into steam, directly reducing the factory's fresh steam consumption and water replenishment costs, lowering production costs, and simultaneously achieving energy conservation.

[0061] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A system for recovering waste steam working fluid and heat and producing low-pressure steam, characterized in that: It includes a steam point, a water jet ejector, a water collection tank, an evaporator, a compressor, a condenser, a feed water pump, a flash tank, a steam-water separator, and a steam compressor; The exhaust steam outlet of the steam consumption point is connected to the exhaust steam inlet of the water jet ejector via a main pipe; the outlet of the water collection tank is connected to the cooled side inlet of the evaporator via a circulating pump. The cooled side outlet of the evaporator is connected to the drive water inlet of the water jet ejector. The refrigerant outlet of the evaporator is connected to the inlet of the compressor, the outlet of the compressor is connected to the refrigerant inlet of the condenser, and the refrigerant outlet of the condenser is connected to the refrigerant inlet of the evaporator; the heated water outlet of the condenser is connected to the feed water inlet of the flash tank; the unvaporized feed water outlet at the bottom of the flash tank is connected to the heated water inlet of the condenser via a feed water pump; the steam outlet at the top of the flash tank is connected to the inlet of the steam-water separator, the steam outlet of the steam-water separator is connected to the inlet of the steam compressor, and the outlet of the steam compressor is connected to the steam inlet of the steam consumption point via a steam delivery pipeline.

2. The system for recovering waste steam working fluid and heat and producing low-pressure steam according to claim 1, characterized in that: The unvaporized feedwater outlet of the flash tank is connected to the feedwater pump via a connecting pipe, so that the unvaporized feedwater is sent back into the flash tank after being pumped by the feedwater pump, forming a circulation loop.

3. The system for recovering waste steam working fluid and heat and producing low-pressure steam according to claim 1, characterized in that: The water collection tank is equipped with a water supply pipe, an overflow pipe, and a water discharge pipe. The outlet of the water collection tank is connected to the inlet of the circulating pump through the water supply pipe. When the volume of water in the water collection tank exceeds the interface of the overflow pipe, the water in the water collection tank will automatically overflow.

4. The system for recovering waste steam working fluid and heat and producing low-pressure steam according to claim 1, characterized in that: The refrigerant outlet of the condenser is connected to the refrigerant inlet of the evaporator via a throttling valve.

5. The system for recovering waste steam working fluid and heat and producing low-pressure steam according to claim 2, characterized in that: The system for recovering waste steam working fluid and heat and producing low-pressure steam also includes a water supply tank, the outlet of which is connected to the feed water pump via a connecting pipe.

6. The system for recovering waste steam working fluid and heat and producing low-pressure steam according to claim 1, characterized in that: The outlet of the steam compressor is connected to a pressure stabilizing tank, and the outlet of the pressure stabilizing tank is connected to the steam inlet of the steam consumption point through a steam transmission pipeline.

7. The system for recovering waste steam working fluid and heat and producing low-pressure steam according to claim 1, characterized in that: The steam consumption points are set in multiple groups, and all groups of steam consumption points are connected to the exhaust steam inlet of the water jet steam extractor through a main pipe.

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