Steam condensate water recycling system for chemical industry park

Abstract

The utility model provides a steam condensate water recycling system for a chemical industry park, and belongs to the technical field of steam condensate water recycling. The system comprises a drain valve, a first condensate pump, a condensate pipe network, a condensate water tank, a second condensate pump, a plate heat exchanger and a heat pump system. And through the arrangement that the plate heat exchanger is coupled with the heat pump system, the waste heat of the condensate water is further recovered, and ideal condensate water waste heat recovery is achieved. The system further comprises an iron removal device, an oil removal device and a condensate water recovery system for fine treatment, the condensate water recovery system for fine treatment is connected with the heat pump system in parallel, and the problems that waste heat utilization is not thorough and water and heat utilization requirements change along with seasons can be solved. According to the steam condensate water recycling system for the chemical industry park, the waste heat utilization efficiency is high, condensate water is utilized more thoroughly, and the requirements of users for heat and various different process water can be met.

Description

Technical Field

[0001] This utility model belongs to the field of steam condensate recovery technology, and particularly relates to a steam condensate recovery and utilization system in a chemical industrial park. Background Technology

[0002] In chemical industrial parks, heat-consuming enterprises typically use industrial steam in heat exchangers and reactors. After surface heat exchange, the industrial steam only utilizes the latent heat of saturated steam. The saturated water obtained at the same pressure after the saturated steam releases its latent heat is condensate. The condensate contains approximately 25% of the total heat of the steam, a considerable amount. Therefore, large chemical enterprises generally choose to recover and reuse it. However, new fine chemical and biopharmaceutical enterprises, due to their shorter process flows, have less room for waste heat utilization than large chemical enterprises. Their steam condensate is generally cooled by cooling towers and other equipment before being directly discharged, resulting in ineffective utilization of waste heat and a waste of water resources.

[0003] Currently, the solutions for treating steam condensate are as follows: For low-temperature waste heat steam, flash tanks are often used for recovery. However, flash tanks are too large, and when pressurized steam enters the flash tank through pipes, the sudden change in space and pressure leads to significant waste heat loss. Alternatively, a steam condensate recovery device can be installed to directly recover the condensate and produce pure water.

[0004] However, the heat utilization rate of the steam condensate in the above scheme is relatively low. Furthermore, while the condensate is usually high-quality distilled water, the production processes of heat-using enterprises may introduce oil and tap water with low water quality requirements into the condensate, leading to substandard condensate quality. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this utility model provides a steam condensate recovery and utilization system for chemical industrial parks. This system has high efficiency in utilizing waste heat and more thorough utilization of condensate, and can meet the user's needs for heat and various process water.

[0006] To achieve the above objectives, the technical solution of this utility model includes: a steam trap, a first condensate pump, a condensate pipe network, a condensate tank, a second condensate pump, a plate heat exchanger, and a heat pump system.

[0007] The output end of the steam trap is connected to the input end of the first condensate pump, and the output end of the first condensate pump is connected to the input end of the condensate pipe network. After the condensate flows through the steam trap, the first condensate pump provides power to transport the condensate to the condensate pipe network. The condensate then flows into the condensate tank after passing through the condensate pipe network.

[0008] The condensate outlet of the condensate tank is connected to the input end of the second condensate pump, and the output end of the second condensate pump is connected to the condensate inlet end of the plate heat exchanger. The second condensate pump provides power to transport the condensate in the condensate tank to the plate heat exchanger. A flow regulating valve is provided between the second condensate pump and the plate heat exchanger.

[0009] The heat pump system includes an evaporator; the condensate outlet of the plate heat exchanger is connected to the condensate inlet of the evaporator, so that the condensate enters the evaporator for heat exchange; after heat exchange, the condensate in the evaporator is discharged into the pipeline through the condensate outlet of the evaporator.

[0010] As a further implementation, the heat pump system also includes an expansion valve, a compressor, and a condenser;

[0011] The outlet end of the expansion valve is connected to the refrigerant side inlet end of the evaporator, the refrigerant side outlet end of the evaporator is connected to the inlet end of the compressor, the outlet end of the compressor is connected to the refrigerant inlet end of the condenser, and the refrigerant outlet end of the condenser is connected to the inlet end of the expansion valve.

[0012] As a further implementation, the steam condensate recovery and utilization system also includes a demineralized water tank, a third condensate pump, a fourth condensate pump, and a deaerator.

[0013] The output end of the demineralized water tank is connected to the input end of the third condensate pump. The output end of the third condensate pump is connected to the demineralized water inlet end of the plate heat exchanger through the first branch. Powered by the third condensate pump, the demineralized water in the demineralized water tank is transported to the plate heat exchanger for heat exchange.

[0014] The demineralized water outlet of the plate heat exchanger is connected to the inlet of the fourth condensate pump, and the outlet of the fourth condensate pump is connected to the inlet of the deaerator. Powered by the fourth condensate pump, the demineralized water heated by the plate heat exchanger is transported to the deaerator.

[0015] As a further implementation, the steam condensate recovery and utilization system also includes a demineralized water tank, a third condensate pump, a fourth condensate pump, and a deaerator.

[0016] The output end of the demineralized water tank is connected to the input end of the third condensate pump. The output end of the third condensate pump is connected to the demineralized water inlet of the condenser through the second branch. The third condensate pump provides power to transport the demineralized water in the demineralized water tank to the condenser for heat exchange.

[0017] The demineralized water outlet of the condenser is connected to the input of the fourth condensate pump, and the output of the fourth condensate pump is connected to the input of the deaerator. Powered by the fourth condensate pump, the demineralized water heated by the heat pump system is transported to the deaerator.

[0018] As a further implementation, an iron removal device and an oil removal device are provided between the flow regulating valve and the plate heat exchanger.

[0019] As a further implementation, the iron removal device and the oil removal device are connected in series.

[0020] As a further implementation, the iron removal device includes one or more of a conventional filter, a porous high-temperature resistant ceramic filter media device, and an electromagnetic iron removal device; the oil removal device includes one or more of a conventional filter and a porous high-temperature resistant ceramic filter media device.

[0021] As a further implementation, the system also includes a condensate recovery system for fine treatment; the condensate recovery system for fine treatment is connected in parallel with the heat pump system; after the condensate is discharged from the condensate outlet of the plate heat exchanger, it can also be fed into the condensate recovery system for fine treatment.

[0022] As a further implementation, the condensate recovery system for the fine treatment includes a reverse osmosis unit and an ion exchanger; the outlet end of the reverse osmosis unit is connected to the inlet end of the ion exchanger.

[0023] As a further implementation, the condensate in the plate heat exchanger flows into the inlet of the water collection device or mixing device through the condensate outlet of the plate heat exchanger. After mixing and cooling with the incoming raw water, it flows into the inlet of the reverse osmosis device through the outlet of the water collection device or mixing device.

[0024] The above one or more technical solutions have the following beneficial effects:

[0025] (1) This utility model uses a plate heat exchanger coupled with a heat pump system to further recover the waste heat of condensate, achieving a more ideal condensate waste heat recovery. Unqualified condensate is used as circulating cooling water for the condenser or discharged.

[0026] (2) When the water quality fails to meet the standards as detected by online water quality monitoring or manual sampling, it can be treated by iron removal device, oil removal device and condensate recovery system of fine treatment to achieve the purpose of reducing conductivity and producing demineralized water.

[0027] (3) Chemical enterprises have many processes, and different processes usually have different water standards. Moreover, the water consumption of some processes (such as boiler feedwater and cooling) is greatly affected by the season. This utility model connects the condensate recovery system of the fine treatment in parallel with the heat pump system, so that enterprises can flexibly select the condensate recovery system and overcome the problem of water and heat demand changing with the season. Attached Figure Description

[0028] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0029] Figure 1 This utility model relates to a condensate recovery system for a coupled heat pump system.

[0030] Figure 2 This utility model relates to a condensate recovery system that requires iron and oil removal and fine treatment.

[0031] In the diagram, 1. Steam trap; 2. First condensate pump; 3. Condensate pipe network; 4. Condensate tank; 5. First online water quality monitoring device or manual sampling point; 6. Second condensate pump; 7. Flow regulating valve; 8. Plate heat exchanger; 9. Evaporator; 10. Compressor; 11. Expansion valve; 12. Condenser; 13. Third condensate pump; 14. Demineralized water tank; 15. Fourth condensate pump; 16. Deaerator; 17. Iron removal device; 18. Oil removal device; 19. Second online water quality monitoring device or manual sampling point; 20. Reverse osmosis unit; 21. Ion exchanger. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Example 1:

[0034] See Figure 1 The steam condensate recovery and utilization system in the chemical industrial park includes: a steam trap 1, a first condensate pump 2, a condensate pipe network 3, a condensate tank 4, a second condensate pump 6, a plate heat exchanger 8, and a heat pump system; the heat pump system includes an evaporator 9.

[0035] The steam used by heat-consuming enterprises (those that rely on heat supply to maintain production or operation, such as pharmaceutical and chemical companies) typically operates at a temperature of 200-240℃ and a pressure of 1.4-2.2 MPa. After the heat is used in the production process, the steam liquefies into high-temperature condensate, with a temperature of approximately 85-105℃. The condensate from the heat-consuming enterprise flows through a steam trap 1. The output of steam trap 1 is connected to the input of a first condensate pump 2, which in turn connects to the input of a condensate pipe network 3. Powered by the first condensate pump 2, the condensate is transported to the condensate pipe network 3. The condensate then flows through the condensate pipe network 3 into a condensate tank 4. The condensate tank 4 is a conventional existing device responsible for receiving and storing the condensate. The condensate outlet of the condensate tank 4 is located on its side wall. A first online water quality monitoring device or a manual sampling point 5 is also installed at the condensate outlet of the condensate tank 4. After passing online water quality monitoring or manual testing, condensate that meets the standard requirements can be directly discharged through a ball valve or gate valve. The ball valve or gate valve is connected to the drain port at the bottom of the condensate tank 4. However, in this embodiment, to fully utilize the heat in the condensate, regardless of whether the condensate quality meets the standard requirements, the condensate in the condensate tank 4 can be transported to the plate heat exchanger 8. The condensate outlet of the condensate tank 4 is connected to the input end of the second condensate pump 6, and the output end of the second condensate pump 6 is connected to the condensate inlet end of the plate heat exchanger 8, with the second condensate pump 6 providing the power. A flow regulating valve 7 is also provided between the output end of the second condensate pump 6 and the condensate inlet end of the plate heat exchanger 8 to regulate the condensate flow rate.

[0036] The plate heat exchanger 8 is equipped with a condensate inlet, a demineralized water inlet, a condensate outlet, and a demineralized water outlet. Condensate from the condensate tank 4 is supplied to the plate heat exchanger 8 for heat exchange. The condensate outlet of the plate heat exchanger 8 is connected to the condensate inlet of the evaporator 9, and the condensate enters the evaporator 9 of the heat pump system through the condensate outlet of the plate heat exchanger 8. Demineralized water from the demineralized water tank 14 is divided into two branches by the third condensate pump 13. When the plate heat exchanger 8 is operating, the output of the demineralized water tank 14 is connected to the input of the third condensate pump 13. The output of the third condensate pump 13 is connected to the demineralized water inlet of the plate heat exchanger 8 through the first branch. Powered by the third condensate pump 13, the demineralized water from the demineralized water tank 14 is supplied to the plate heat exchanger 8. During this process, the condensate exchanges heat with the demineralized water in the plate heat exchanger 8, transferring the heat of the condensate to the demineralized water, which helps to raise the temperature of the demineralized water. This allows the demineralized water to save a lot of steam during the heating process in the deaerator 16, achieving the effect of heat recovery and utilization.

[0037] The working principle of plate heat exchanger 8: When two fluids at different temperatures, such as low-temperature demineralized water and high-temperature condensate, flow through the channels between the plates, heat is transferred from the high-temperature condensate to the low-temperature demineralized water due to the temperature difference. In this process, the plate structure of plate heat exchanger 8 plays a crucial role, increasing the contact area between the condensate and demineralized water and the plates, while also promoting fluid turbulence, thereby improving heat exchange efficiency.

[0038] To further recover the waste heat from the condensate and achieve a more ideal waste heat recovery, a heat pump system is coupled to the above structure. The heat pump system includes: an evaporator 9, an expansion valve 11, a compressor 10, and a condenser 12. The outlet end of the expansion valve 11 is connected to the refrigerant-side inlet end of the evaporator 9, the refrigerant-side outlet end of the evaporator 9 is connected to the inlet end of the compressor 10, the outlet end of the compressor 10 is connected to the refrigerant inlet end of the condenser 12, and the refrigerant outlet end of the condenser 12 is connected to the inlet end of the expansion valve 11.

[0039] When the temperature of the condensate after heat exchange in plate heat exchanger 8 drops to around 30°C, it flows into evaporator 9 from the condensate outlet of plate heat exchanger 8. After absorbing heat through the heat pump system, the temperature of the condensate drops from around 30°C to around 5°C. At this point, the cooled condensate that does not meet the required temperature is directly discharged from the condensate outlet of evaporator 9, or used as circulating cooling water for the condenser.

[0040] When the heat pump system is operating, the output of the demineralized water tank 14 is connected to the input of the third condensate pump 13. The output of the third condensate pump 13 is connected to the demineralized water inlet of the condenser 12 via a second branch. Powered by the third condensate pump 13, the demineralized water in the demineralized water tank 14 is transported to the condenser 12. During this process, the heat recovered by the evaporator 9 of the heat pump system is transferred to the condenser 12 by the refrigerant to heat the demineralized water. The demineralized water outlet of the condenser 12 is connected to the input of the fourth condensate pump 15, and the output of the fourth condensate pump 15 is connected to the input of the deaerator 16. Powered by the fourth condensate pump 15, the demineralized water heated by the heat pump system is transported to the deaerator 16 as boiler feedwater.

[0041] The working principle of the heat pump system is as follows: The compressor 10, driven by the engine, extracts gaseous refrigerant from the evaporator 9 and compresses it into the condenser 12. The high-pressure gaseous refrigerant liquefies and releases heat as it passes through the condenser 12. Simultaneously, demineralized water from the demineralized water tank 14 is transported to the condenser 12 for heat exchange. After the heat exchange, the released heat is carried away by the demineralized water. The high-pressure liquid refrigerant is depressurized by the expansion valve 11, and the low-pressure liquid refrigerant vaporizes in the evaporator 9, absorbing heat. Meanwhile, the condensate flowing out of the plate heat exchanger 8 is cooled to approximately 5°C due to the absorption of heat. Further, the gaseous refrigerant is drawn away by the compressor 10 and transported to the condenser 12, thus creating a closed-loop circulation of the refrigerant. The heat from the condensate is continuously transferred to the condenser 12 to heat the demineralized water, which is then used as boiler feedwater. Simultaneously, the high-temperature condensate exchanges heat with the low-temperature demineralized water, cooling the high-temperature condensate to a low temperature, which can then be directly discharged.

[0042] The specific working principle of this recovery system includes: condensate generated by the heat-using enterprise flows into the condensate pipe network 3 through the enterprise's steam trap 1, and then into the condensate tank 4. The outlet of the condensate tank 4 is equipped with a first online water quality monitoring device or a manual sampling point 5. After testing by the online water quality monitoring device or manual analysis, condensate that meets or does not meet the standard requirements can sequentially pass through the plate heat exchanger 8 and the heat pump system for heat exchange. After heat exchange, the temperature of the condensate decreases, and it can be directly discharged into the pipeline for recovery or discharge through the condensate outlet of the evaporator 9 in the heat pump system.

[0043] The demineralized water in the demineralized water tank 14 is divided into two branches by the third condensate pump 13. The first branch, powered by the third condensate pump 13, transports the demineralized water from the tank 14 to the plate heat exchanger 8 when the plate heat exchanger 8 is operating. The second branch, powered by the third condensate pump 13, transports the demineralized water from the tank 14 to the condenser 12 when the heat pump system is operating. These two branches allow the demineralized water to exchange heat in both the plate heat exchanger 8 and the condenser 12, transferring heat from the condensate to the demineralized water and helping to raise its temperature. This saves a significant amount of steam during the heating process in the deaerator 16, achieving the effect of heat recovery and utilization.

[0044] Example 2:

[0045] See Figure 2The steam condensate recovery and utilization system in the chemical industrial park also includes: an iron removal device 17, an oil removal device 18, and a fine-treatment condensate recovery system. Condensate fine treatment is a technology used to treat condensate in boiler feedwater systems, aiming to improve feedwater quality and prevent scaling and corrosion in equipment such as boilers and turbines. The fine-treatment condensate recovery system is connected in parallel with the heat pump system described in Example 1. After being discharged from the condensate outlet of the plate heat exchanger 8, the condensate can also be fed into the fine-treatment condensate recovery system. The fine-treatment condensate recovery system includes a reverse osmosis device 20 and an ion exchanger 21.

[0046] When the condensate water quality is substandard, an iron removal device 17 and an oil removal device 18 are installed between the flow regulating valve 7 and the plate heat exchanger 8 in the system described in Example 1. The iron removal device 17 and the oil removal device 18 are connected in series, and the condensate water flows through the iron removal device 17 and the oil removal device 18 in sequence. Commonly used iron removal devices 17 include: ordinary filters, porous high-temperature resistant ceramic filter media devices (e.g., foam ceramic filters, porous ceramic filters, porous ceramic filter plates), and electromagnetic iron removal devices (e.g., electromagnetic separators). Commonly used oil removal devices 18 include: ordinary filters and porous high-temperature resistant ceramic filter media devices. A second online water quality monitoring device or a manual sampling point 19 is installed at the outlet of the oil removal device 18.

[0047] If online monitoring devices or manual testing indicate that the conductivity of the condensate exceeds the standard, heat exchange should first be performed through plate heat exchanger 8 to lower the temperature of the condensate below the required temperature of the water treatment system (generally below 35℃). During this process, after the demineralized water absorbs heat from the condensate, the demineralized water outlet of plate heat exchanger 8 is connected to the input end of the fourth condensate pump 15, and the output end of the fourth condensate pump 15 is connected to the input end of the deaerator 16. Powered by the fourth condensate pump 15, the demineralized water after heat exchange in plate heat exchanger 8 is directly transported to deaerator 16.

[0048] If the condensate cooled to approximately 30°C meets the inlet water quality standards of the fine treatment system, it should first be mixed with the raw water for further cooling. Specifically, the condensate outlet of plate heat exchanger 8 is connected to the inlet of a water collection device or mixing device, and the outlet of the water collection device or mixing device is connected to the inlet of the fine treatment condensate recovery system. The condensate in plate heat exchanger 8 flows into the inlet of the water collection device or mixing device through the condensate outlet, mixing with the incoming raw water for cooling. After cooling, it flows into the fine treatment condensate recovery system from the outlet of the water collection device or mixing device. Here, the fine treatment condensate recovery system can be an existing chemical water treatment system. The chemical water treatment system is used to supply qualified demineralized water as makeup water to boilers and other thermal equipment, while further treating the condensate to remove harmful substances (such as copper, iron, silicon, etc.) to prevent scaling and corrosion of furnace tubes in thermal equipment and to prevent salt accumulation on turbine blades, thereby protecting the safe operation of turbines, boilers, and other thermal equipment.

[0049] The condensate is finely treated using the company's existing chemical water treatment system, such as reverse osmosis unit 20 and ion exchanger 21. In this embodiment, the outlet of the water collection device or mixing device is connected to the inlet of reverse osmosis unit 20, and the outlet of reverse osmosis unit 20 is connected to the inlet of ion exchanger 21. The condensate, after being mixed with and cooled from the raw water, flows sequentially through reverse osmosis unit 20 and ion exchanger 21 into demineralized water tank 14, achieving the purpose of reducing conductivity to produce demineralized water. The outlet of ion exchanger 21 is connected to the input of demineralized water tank 14. After reducing conductivity, qualified demineralized water can be directly transported to demineralized water tank 14. The output of demineralized water tank 14 is connected to the input of fourth condensate pump 15, and the output of fourth condensate pump 15 is connected to the input of deaerator 16. Powered by fourth condensate pump 15, demineralized water is transported from demineralized water tank 14 to deaerator 16. The reverse osmosis device 20 can be a reverse osmosis water purifier. The working principle of the reverse osmosis device 20 is to separate the solute and solvent in the solution by using a semi-permeable membrane.

[0050] The specific working principle of this recovery system includes: condensate generated by the heat-using enterprise flows into the condensate pipe network 3 through the heat-using enterprise's steam trap 1, and then into the condensate tank 4. A first online water quality monitoring device or manual sampling point 5 is installed at the outlet of the condensate tank 4. After online water quality monitoring or manual testing, condensate that does not meet the standard requirements can be treated sequentially by an iron removal device 17 and an oil removal device 18. After iron and oil removal, a second online water quality monitoring device or manual sampling point 19 is installed for online water quality monitoring or manual testing. If the test results show that the conductivity of the condensate exceeds the standard, the temperature of the condensate should first be reduced to below the temperature required by the water treatment system (generally below 35℃) through a plate heat exchanger 8. If the condensate cooled to about 30°C meets the inlet water quality standards of the fine treatment system, it should be mixed with the raw water and cooled down before passing through the reverse osmosis unit 20 and the ion exchanger 21 in sequence to achieve the purpose of reducing conductivity and producing demineralized water. The qualified demineralized water can directly enter the deaerator 16.

[0051] Specifically, the following scenarios can be prioritized for activating the steam condensate recovery and utilization system in the chemical industrial park described in Example 1: For example, in winter, which is the season with heating demand, the system described in Example 1 can be activated to better heat the demineralized water; in summer, the demand for cooling water increases, while the water quality requirements for circulating cooling water are relatively low. In this case, unqualified condensate can be directly used as circulating cooling water for the condenser.

[0052] The following scenario allows for the priority activation of the steam condensate recovery and utilization system in the chemical industrial park described in Example 2: For example, during transitional seasons such as spring and autumn, while recovering heat through the plate heat exchanger 8, unqualified condensate can also be treated by one or more devices or systems in the condensate recovery system, including the iron removal device 17, the oil removal device 18, and the fine treatment device, to meet the water demand of different process stages.

[0053] In other words, the steam condensate recovery and utilization system for chemical industrial parks provided by this utility model can overcome the problems of incomplete heat recovery and utilization as well as the seasonal changes in water demand for different processes. It can achieve more thorough heat recovery and utilization, and can flexibly meet the water demand of various processes, thereby significantly improving the efficiency of steam condensate recovery and utilization.

[0054] In this embodiment, the size, height, and spacing of each part are for illustrative purposes only. The size of the specific pipes and various valves can be adjusted according to the actual production dimensions. The length, thickness, and shell thickness of the lines in the accompanying drawings are for illustrative purposes only. Those skilled in the art can make adaptive adjustments based on actual usage.

[0055] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A chemical industrial park steam condensate water recycling system, characterized in that, include: Steam trap, first condensate pump, condensate piping network, condensate tank, second condensate pump, plate heat exchanger and heat pump system; The output end of the steam trap is connected to the input end of the first condensate pump, and the output end of the first condensate pump is connected to the input end of the condensate pipe network. After the condensate flows through the steam trap, the first condensate pump provides power to transport the condensate to the condensate pipe network. The condensate then flows into the condensate tank after passing through the condensate pipe network. The condensate outlet of the condensate tank is connected to the input end of the second condensate pump, and the output end of the second condensate pump is connected to the condensate inlet end of the plate heat exchanger. The second condensate pump provides power to transport the condensate in the condensate tank to the plate heat exchanger. A flow regulating valve is provided between the second condensate pump and the plate heat exchanger. The heat pump system includes an evaporator; the condensate outlet of the plate heat exchanger is connected to the condensate inlet of the evaporator, so that the condensate enters the evaporator for heat exchange. After heat exchange, the condensate in the evaporator is discharged into the pipeline through the evaporator's condensate outlet.

2. The chemical industrial park steam condensate recovery and utilization system as described in claim 1, characterized in that, The heat pump system also includes an expansion valve, a compressor, and a condenser; The outlet end of the expansion valve is connected to the refrigerant side inlet end of the evaporator, the refrigerant side outlet end of the evaporator is connected to the inlet end of the compressor, the outlet end of the compressor is connected to the refrigerant inlet end of the condenser, and the refrigerant outlet end of the condenser is connected to the inlet end of the expansion valve.

3. The chemical park steam condensate water recycling system of claim 1, wherein, The steam condensate recovery and utilization system also includes a demineralized water tank, a third condensate pump, a fourth condensate pump, and a deaerator; The output end of the demineralized water tank is connected to the input end of the third condensate pump. The output end of the third condensate pump is connected to the demineralized water inlet end of the plate heat exchanger through the first branch. Powered by the third condensate pump, the demineralized water in the demineralized water tank is transported to the plate heat exchanger for heat exchange. The demineralized water outlet of the plate heat exchanger is connected to the inlet of the fourth condensate pump, and the outlet of the fourth condensate pump is connected to the inlet of the deaerator. Powered by the fourth condensate pump, the demineralized water heated by the plate heat exchanger is transported to the deaerator.

4. The chemical park steam condensate water recycling system of claim 2, wherein, The steam condensate recovery and utilization system also includes a demineralized water tank, a third condensate pump, a fourth condensate pump, and a deaerator; The output end of the demineralized water tank is connected to the input end of the third condensate pump. The output end of the third condensate pump is connected to the demineralized water inlet of the condenser through the second branch. The third condensate pump provides power to transport the demineralized water in the demineralized water tank to the condenser for heat exchange. The demineralized water outlet of the condenser is connected to the input of the fourth condensate pump, and the output of the fourth condensate pump is connected to the input of the deaerator. Powered by the fourth condensate pump, the demineralized water heated by the heat pump system is transported to the deaerator.

5. The chemical park steam condensate water recycling system of claim 1, wherein, An iron removal device and an oil removal device are provided between the flow regulating valve and the plate heat exchanger.

6. The chemical park steam condensate water recycling system of claim 5, wherein, The iron removal device and the oil removal device are connected in series.

7. The chemical industrial park steam condensate water recycling system of claim 5, wherein, The iron removal device includes one or more of a common filter, a porous high-temperature resistant ceramic filter media device, and an electromagnetic iron removal device; the oil removal device includes one or more of a common filter and a porous high-temperature resistant ceramic filter media device.

8. The chemical park steam condensate water recycling system of claim 1, wherein, The system also includes a fine-treatment condensate recovery system; the fine-treatment condensate recovery system is connected in parallel with the heat pump system; after the condensate is discharged from the condensate outlet of the plate heat exchanger, it can also be fed into the fine-treatment condensate recovery system.

9. The chemical industrial park steam condensate recovery and utilization system as described in claim 8, characterized in that, The condensate recovery system for the fine treatment includes a reverse osmosis unit and an ion exchanger; the outlet end of the reverse osmosis unit is connected to the inlet end of the ion exchanger.

10. The chemical park steam condensate water recycling system of claim 9, wherein, The condensate in the plate heat exchanger flows into the inlet of the water collection device or mixing device through the condensate outlet of the plate heat exchanger. After mixing with the incoming raw water and cooling down, it flows into the inlet of the reverse osmosis device through the outlet of the water collection device or mixing device.

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