Industrial waste heat driven ejector refrigeration and wastewater treatment coupling system

Abstract

This application provides an industrial waste heat-driven jet refrigeration and wastewater treatment coupling system, including a waste heat gradient recovery subsystem, a jet refrigeration subsystem, and a multi-effect distillation wastewater treatment subsystem. The high-heat recovery loop and medium-heat recovery loop in the waste heat gradient recovery subsystem utilize the recovered industrial waste heat to drive the corresponding steam ejectors in the jet refrigeration subsystem and the multi-effect distillation wastewater treatment subsystem, respectively, thereby driving the heat medium circulation of the subsystem. The waste heat gradient recovery subsystem performs graded recovery of waste heat generated in the industrial production process, while the wastewater to be treated by the multi-effect distillation wastewater treatment subsystem recovers heat in this coupling system for preheating. Through the above configuration, this coupling system not only recovers industrial waste heat to provide cooling for a specific local environment but also desalinates wastewater, thus constructing a complete green internal cycle for ceramic production processes and waste heat and wastewater treatment.

Description

Technical Field

[0001] This application relates to the field of industrial waste heat recovery technology, and in particular to an industrial waste heat-driven jet refrigeration and wastewater treatment coupling system. Background Technology

[0002] In ceramic production, especially during the firing process, the temperature in ceramic kilns can reach as high as 1350℃. This process consumes a large amount of fuel and produces large quantities of high-temperature, high-carbon flue gas. Secondly, the ceramic industry chain involves many processes operating in high-temperature environments, resulting in excessively high ambient temperatures in certain areas that typically require additional cooling. Currently, most ceramic production bases rely primarily on air conditioning and refrigeration equipment that consume additional electricity to meet these cooling needs, significantly increasing energy consumption. Furthermore, the ceramic production process consumes large amounts of tap water, generating substantial amounts of industrial wastewater. Summary of the Invention

[0003] This application provides an industrial waste heat-driven jet refrigeration and wastewater treatment coupling system to solve the defects in the prior art where a large amount of waste heat and wastewater generated in the production process cannot be effectively utilized, and to realize a green internal circulation of local area refrigeration, waste heat recovery and wastewater treatment in the industrial production process.

[0004] This application provides an industrial waste heat-driven jet refrigeration and wastewater treatment coupling system, which includes:

[0005] The waste heat gradient recovery subsystem includes a high heat recovery loop and a medium heat recovery loop. The high heat recovery loop has a first heat medium flowing therein and includes a first heat medium input section and a first heat medium output section. The medium heat recovery loop has a second heat medium flowing therein.

[0006] The jet refrigeration subsystem includes a steam generator, a first steam ejector, and an evaporator. The jet refrigeration subsystem has a third heat medium flowing therein. The first steam ejector includes a first high-pressure steam inlet, a first low-pressure steam inlet, and a first mixed fluid outlet.

[0007] The multi-effect distillation wastewater treatment subsystem includes a second steam ejector, a first-effect distillation chamber, and a condensation chamber. The second steam ejector includes a second high-pressure steam inlet, a second low-pressure steam inlet, and a second mixed fluid outlet. The first-effect distillation chamber and the condensation chamber each include their own heat exchange pipelines.

[0008] The first heat medium output section is fluidly connected to the second high-pressure steam inlet, the second mixed fluid outlet is fluidly connected to the inlet of the first heat exchange pipeline of the first-effect distillation chamber, the outlet of the first heat exchange pipeline is at least fluidly connected to the first heat medium input section, the outlet of the condensation heat exchange pipeline of the condensation chamber is fluidly connected to the second low-pressure steam inlet, the first mixed fluid outlet is fluidly connected to the steam generator and the evaporator respectively, the steam generator is fluidly connected to the first high-pressure steam inlet, the evaporator is fluidly connected to the first low-pressure steam inlet, the intermediate heat recovery loop exchanges heat with a portion of the third heat medium in the steam generator, and the remaining portion of the third heat medium evaporates and absorbs heat in the evaporator.

[0009] According to the industrial waste heat driven jet refrigeration and wastewater treatment coupling system provided in this application, the jet refrigeration subsystem further includes a condenser, and the first mixed fluid outlet is fluidly connected to the steam generator and the evaporator through the condenser.

[0010] According to the industrial waste heat driven jet refrigeration and wastewater treatment coupling system provided in this application, the multi-effect distillation wastewater treatment subsystem also includes a wastewater feed pipeline, and the third heat medium exchanges heat with the wastewater feed pipeline in the condenser.

[0011] According to the industrial waste heat driven jet refrigeration and wastewater treatment coupling system provided in this application, a pump is further provided between the condenser and the steam generator, and the pump is used to maintain the fluid pressure of a portion of the third heat medium.

[0012] According to the industrial waste heat driven jet refrigeration and wastewater treatment coupling system provided in this application, a throttling valve is further provided between the condenser and the evaporator. The throttling valve is used to reduce the fluid pressure of the remaining part of the third heat medium.

[0013] According to the present application, an industrial waste heat-driven jet refrigeration and wastewater treatment coupling system includes a heat recovery loop comprising a second heat medium input section and a second heat medium output section. The second heat medium input section is equipped with a heat exchanger, and the second heat medium and the wastewater inlet pipeline exchange heat in the heat exchanger.

[0014] According to the industrial waste heat driven jet refrigeration and wastewater treatment coupling system provided in this application, the multi-effect distillation wastewater treatment subsystem further includes several subsequent distillation chambers, each of which includes its own heat exchange pipeline, and the first-effect distillation chamber and several subsequent distillation chambers each include a corresponding flash chamber.

[0015] The first-effect distillation chamber, several subsequent-effect distillation chambers, and the condenser are sequentially fluidly connected. The first-effect distillation chamber and several subsequent-effect distillation chambers are each fluidly connected to their respective flash chambers. The corresponding flash chambers are fluidly connected to the heat exchange pipelines of the subsequent subsequent-effect distillation chambers or condensers.

[0016] According to the industrial waste heat driven jet refrigeration and wastewater treatment coupling system provided in this application, water vapor from the preceding follow-effect distillation chamber and its corresponding flash chamber exchanges heat with the wastewater feed pipeline in the condensation heat exchange pipeline.

[0017] According to the industrial waste heat driven jet refrigeration and wastewater treatment coupling system provided in this application, the heat-exchanged wastewater is transported to the first-effect distillation chamber and several subsequent-effect distillation chambers, where heat exchange takes place in the corresponding heat exchange pipelines.

[0018] According to the industrial waste heat driven jet refrigeration and wastewater treatment coupling system provided in this application, in the waste heat gradient recovery subsystem, the first heat medium output section, the second heat medium output section, the first heat medium input section and the second heat medium input section sequentially recover industrial waste heat in the order of cooling.

[0019] The industrial waste heat-driven jet refrigeration and wastewater treatment coupling system provided in this application recovers industrial waste heat through a waste heat gradient recovery subsystem. The recovered waste heat is then used to drive a jet refrigeration subsystem to cool specific local environments, while simultaneously driving a multi-effect distillation wastewater treatment subsystem to desalinate wastewater generated during production. This gradient recovery and utilization of industrial waste heat is used to optimize the associated working environment or treat byproducts of the production process, improving the energy efficiency of ceramic production and constructing a complete green internal cycle for ceramic production processes and waste heat and wastewater treatment. Furthermore, the industrial waste heat-driven jet refrigeration and wastewater treatment coupling system provided in this application recovers industrial waste heat step-by-step through the waste heat gradient recovery subsystem. Heat exchange / preheating of wastewater is performed in the intermediate heat recovery loop, condenser, and condensation chamber. This precise and innovative arrangement of heat exchange levels and sites for waste heat recovery and wastewater preheating within the coupling system achieves both efficient recovery and utilization of industrial waste heat and energy-saving, efficient preheating for wastewater treatment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the waste heat gradient recovery subsystem provided in this application.

[0022] Figure 2 This is a schematic diagram of the jet cooling subsystem provided in this application.

[0023] Figure 3This is a schematic diagram of the multi-effect distillation wastewater treatment subsystem provided in this application.

[0024] Figure label:

[0025] 3. Heat exchanger; 4. Second heat medium inlet section; 5. First heat medium inlet section; 6. Second heat medium outlet section; 7. First heat medium outlet section; 8. Wastewater inlet pipeline (second section); 9. Industrial waste heat inlet; 10. Industrial waste heat outlet; 11. Waste heat gradient recovery chamber; 12. Steam generator; 13. First steam ejector; 14. Condenser; 15. Evaporator; 16. Throttling valve; 17. Pump; 20. First flash chamber; 21. Second flash chamber; 22. Third flash chamber; 23. Fourth flash chamber; 24. First-effect distillation chamber; 25. Second-effect distillation chamber. 26. Distillation Chamber; 27. Third-Effect Distillation Chamber; 28. Fourth-Effect Distillation Chamber; 29. ​​Condensation Chamber; 30. Wastewater Inlet Pipeline (Third Section); 31. Concentrate Discharge Pipeline; 32. Clean Water Collection Pipeline; 33. Second Steam Ejector; 34. Second Heat Exchanger; 35. Second Mixed Fluid Outlet; 36. First Heat Exchange Pipeline; 37. Second Heat Exchange Pipeline; 38. Third Heat Exchange Pipeline; 39. First Steam Outlet; 40. Second Steam Outlet; 41. Third Steam Outlet; 42. Fourth Steam Outlet; 43. Clean Water Pump; V p , supplementary pump. Detailed Implementation

[0026] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but should not be used to limit the scope of this application.

[0027] In the description of the embodiments of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application 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. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections, wherein a fixed connection can include an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0029] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0031] The following is combined Figures 1 to 3 This application describes an industrial waste heat-driven jet refrigeration and wastewater treatment coupling system.

[0032] This industrial waste heat-driven jet refrigeration and wastewater treatment coupled system includes a waste heat gradient recovery subsystem, a jet refrigeration subsystem, and a multi-effect distillation wastewater treatment subsystem, which are coupled together.

[0033] like Figure 1As shown, the waste heat gradient recovery subsystem includes at least a high-heat recovery loop and a medium-heat recovery loop. The high-heat recovery loop has a first heat medium flowing therein, which is water, and includes a first heat medium input section 5 and a first heat medium output section 7. The medium-heat recovery loop has a second heat medium flowing therein, which can be a refrigerant, heat transfer oil, or other working fluid, and includes a second heat medium input section 4 and a second heat medium output section 6. In the ceramic production process, the high-temperature flue gas emitted from the ceramic kiln is input into the waste heat gradient recovery chamber 11. Specifically, the high-temperature flue gas flows in from the industrial waste heat inlet 9 and exits from the industrial waste heat outlet 10. In the waste heat gradient recovery chamber 11, the first heat medium output section 7, the second heat medium output section 6, the first heat medium input section 5, and the second heat medium input section 4 are arranged sequentially along the flow direction of the high-temperature flue gas. This means that the high-temperature flue gas sequentially exchanges heat with the first heat medium output section 7, the second heat medium output section 6, the first heat medium input section 5, and the second heat medium input section 4, transferring heat to the corresponding heat medium in each stage. As the high-temperature flue gas releases heat at each stage, its temperature naturally decreases accordingly. In the high-heat recovery loop, the first heat medium output section 7, especially the first heat medium flowing within it, absorbs heat from the relatively higher-temperature flue gas compared to the first heat medium input section 5, resulting in a higher temperature. The same applies to the medium-heat recovery loop. Through this temperature gradient-matched heat exchange layout, efficient recovery of the waste heat gradient from the high-temperature flue gas is achieved. After multi-stage heat recovery, the flue gas discharged from the industrial waste heat outlet 10 has a significantly lower temperature compared to the initial stage of emission from the kiln. This significantly reduces the exacerbating effect of the emitted flue gas on global average temperature and effectively solves the carbon emission problem in the ceramic production process.

[0034] like Figure 2 As shown, the jet refrigeration subsystem includes at least a steam generator 12, a first steam ejector 13, a condenser 14, and an evaporator 15. The jet refrigeration subsystem has a third heat transfer medium flowing therein; similar to the second heat transfer medium, the third heat transfer medium can be a refrigerant, heat transfer oil, or other working fluid. The first steam ejector 13 includes a first high-pressure steam inlet, a first low-pressure steam inlet, and a first mixed fluid outlet. The first mixed fluid outlet is fluidly connected to the condenser 14, which is fluidly connected to both the steam generator 12 and the evaporator 15. The steam generator 12 is fluidly connected to the first high-pressure steam inlet, and the evaporator 15 is fluidly connected to the first low-pressure steam inlet.

[0035] The mixed third heat medium ejected from the first mixed fluid outlet of the first steam ejector 13 condenses in the condenser 14, releasing its latent heat. The object of this heat release will be described below. Subsequently, the condensed third heat medium in the condenser 14 is split into two branches, one flowing to the steam generator 12 and the other to the evaporator 15. The second heat medium in the intermediate heat recovery loop exchanges heat with a portion of the third heat medium in the steam generator 12, where a portion of the third heat medium absorbs heat from the second heat medium, thus transforming into high-temperature steam. The remaining portion of the third heat medium evaporates and absorbs heat in the evaporator 15, transforming into steam with relatively low temperature and pressure (relative to the steam generator 12). Furthermore, the remaining portion of the third heat medium absorbs ambient heat here; in other words, the evaporator 15 can provide cooling to the external environment. The heat generated by the ceramic kiln makes the working area extremely hot. Placing the evaporator 15 at the kiln site can alleviate the heat experience for workers to some extent, thus providing a relatively comfortable working environment. High-temperature steam from the steam generator 12 is transported to the first high-pressure steam inlet, and low-temperature, low-pressure steam from the evaporator 15 is transported to the first low-pressure steam inlet. Under the working principle of the first steam ejector 13, they are remixed into a mixed third heat medium and ejected from the first mixed fluid outlet. This forms a circulation of the third heat medium in the jet refrigeration subsystem.

[0036] To maintain the fluid pressure in the branch where the steam generator 12 is located, a pump 17 is installed between the condenser 14 and the steam generator 12, thereby providing sufficient fluid pressure for the third heat medium portion in this branch. On the other hand, in another branch, to ensure that the evaporator 15 properly evaporates the remaining portion of the third heat medium, a throttling valve 16 is installed between the condenser 14 and the evaporator 15. This throttling valve 16 is used to reduce the fluid pressure of the remaining portion of the third heat medium.

[0037] like Figure 3 As shown, the multi-effect distillation wastewater treatment subsystem includes at least a second steam ejector 32, a first-effect distillation chamber 24, and a condenser chamber 28. The second steam ejector 32 includes a second high-pressure steam inlet, a second low-pressure steam inlet, and a second mixed fluid outlet 34. The first-effect distillation chamber 24 and the condenser chamber 28 each include their own heat exchange piping, namely a first heat exchange piping 35 and a condensation heat exchange piping.

[0038] The wastewater treated by the multi-effect distillation wastewater treatment subsystem can be industrial wastewater from ceramic production processes or a mixture of industrial wastewater and seawater. Before being desalinated by multi-effect distillation, the wastewater can be preheated. First, the first section of the wastewater inlet pipe undergoes heat exchange at the condenser 14, where the wastewater absorbs the latent heat released by the condensation of the third heat medium to complete the first preheating. Subsequently, a heat exchanger 3 is installed in the second heat medium input section 4, where the wastewater in the second section 8 of the wastewater inlet pipe exchanges heat with the second heat medium in the second heat medium input section 4, absorbing heat from the second heat medium to complete the second preheating. Furthermore, the third section 29 of the wastewater inlet pipe extends into the condenser chamber 28, where the wastewater exchanges heat with the water vapor in the condenser heat exchange pipe, absorbing heat from the water vapor to complete the third preheating. Preferably, a second heat exchanger 33 is provided between the condenser 28 and the wastewater inlet of each distillation chamber. Before entering each distillation chamber, the wastewater undergoes heat exchange at the second heat exchanger 33, absorbing heat to complete a fourth preheating process, and is then transported to each distillation chamber for treatment. The terms "first," "second," "third," and "fourth" here do not necessarily indicate the order of wastewater preheating, but are merely used for descriptive purposes to distinguish them from each other at the level of defining the terminology.

[0039] The first heat medium output section 7 is fluidly connected to the second high-pressure steam inlet. The second mixed fluid outlet 34 is fluidly connected to the inlet of the first heat exchange pipe 35 of the first-effect distillation chamber 24. Wastewater entering the first-effect distillation chamber 24 exchanges heat with the first heat medium flowing within the first heat exchange pipe 35. The wastewater absorbs a large amount of heat from the first heat medium and evaporates into water vapor. Salts and residues that cannot be evaporated are deposited at the bottom of the first-effect distillation chamber 24 as concentrated liquid or even concentrated solids. The outlet of the first heat exchange pipe 35 is at least fluidly connected to the first heat medium input section 5, which means that at least a portion of the first heat medium flows back to the waste heat gradient recovery subsystem, thus forming a circulation of a portion of the first heat medium in the high-heat recovery loop. In addition, the outlet of the condensation heat exchange pipe of the condenser chamber 28 is fluidly connected to the second low-pressure steam inlet. Similar to the first steam ejector 13, high-temperature, high-pressure steam from the first heat medium output section 7 is conveyed to the second high-pressure steam inlet, and low-temperature steam from the condenser 28 is conveyed to the second low-pressure steam inlet. Under the operating principle of the second steam ejector 32, the steam is remixed into a mixed state of the first heat medium and ejected from the second mixed fluid outlet 34. This also constitutes the circulation of the remaining portion of the first heat medium in the multi-effect distillation wastewater treatment subsystem.

[0040] The multi-effect distillation wastewater treatment subsystem also includes several subsequent distillation chambers. In this embodiment, the multi-effect distillation wastewater treatment subsystem includes a total of four-effect distillation, namely, in addition to the first-effect distillation chamber 24, it also includes a second-effect distillation chamber 25, a third-effect distillation chamber 26, and a fourth-effect distillation chamber 27. Similar to the first-effect distillation chamber 24 and the condenser chamber 28, the second-effect distillation chamber 25, the third-effect distillation chamber 26, and the fourth-effect distillation chamber 27 each include their own heat exchange pipes, namely, the second heat exchange pipe 36, the third heat exchange pipe 37, and the fourth heat exchange pipe 38. Furthermore, the multi-effect distillation wastewater treatment subsystem also includes flash chambers corresponding to each effect distillation chamber, namely, the first flash chamber 20, the second flash chamber 21, the third flash chamber 22, and the fourth flash chamber 23.

[0041] The first steam outlet 39 of the first-effect distillation chamber 24 is fluidly connected to the second-effect distillation chamber 25, so that when wastewater is evaporated / distilled by the first heat exchanger 35, a portion of the steam generated enters the inlet of the second heat exchanger 36 of the second-effect distillation chamber 25; it is also fluidly connected to the first flash chamber 20, where the remaining steam enters, and the concentrate or even concentrated solids settle at the bottom of the first-effect distillation chamber 24. Furthermore, the outlet of the first heat exchanger 35 is also additionally fluidly connected to the first flash chamber 20, meaning that the remaining portion of the first heat medium is collected by the first flash chamber 20. The first flash chamber 20 collects the steam from the first-effect distillation chamber 24, rapidly depressurizes and flashes it, thereby generating secondary steam and further separating the concentrate or even concentrated solids. The first flash chamber 20 is also fluidly connected to the inlet of the second heat exchanger 36 of the second-effect distillation chamber 25. Similar to the operation of the first-effect distillation chamber 24, the wastewater entering the second-effect distillation chamber 25 exchanges heat with the water vapor flowing within the second heat exchange pipe 36. The wastewater absorbs a large amount of heat from the water vapor (from the first-effect distillation chamber 24 and the first flash chamber 20) and evaporates into water vapor. Unevaporable salts and residues precipitate at the bottom of the second-effect distillation chamber 25 as concentrated liquid or even concentrated solids. Subsequently, the second water vapor outlet 40 of the second-effect distillation chamber 25 is fluidly connected to the third-effect distillation chamber 26 (specifically, the inlet of the third heat exchange pipe 37) and the second flash chamber 21, respectively. The distilled water vapor then enters the third heat exchange pipe 37 and the second flash chamber 21, respectively. Simultaneously, the fresh water condensed in the second heat exchange pipe 36 is also transported to the second flash chamber 21. The fluid connection and operation of the third-effect distillation chamber 26 and the fourth-effect distillation chamber 27 are similar to those of the second-effect distillation chamber 25 and will not be described further here.

[0042] It is important to note that the working fluid in the condensation heat exchanger of condensation chamber 28 is a mixture of steam and water vapor from the fourth-effect distillation chamber 27 and the fourth flash chamber 23. At the condensation heat exchanger, the mixed steam condenses and releases heat, performing the aforementioned third preheating of the wastewater in the wastewater inlet pipe (third section) 29. Part of the condensate flows to the second low-pressure steam inlet, returning to the high-heat recovery loop; the other part can be used as clean water, flowing through the clean water collection pipe 31 to an external storage tank for later use.

[0043] Preferably, the first flash chamber 20, the second flash chamber 21, the third flash chamber 22, and the fourth flash chamber 23 can be connected in series in a fluid connection, and the fourth flash chamber 23 is subsequently connected in a fluid connection to the clean water collection pipeline 31. Further, the multi-effect distillation wastewater treatment subsystem also includes a clean water pump 43, located at the output end of the clean water collection pipeline 31. The clean water pump 43 provides stable fluid pressure to the series flow paths of each flash chamber and the clean water collection pipeline 31, thereby ensuring the stable operation of the multi-effect distillation wastewater treatment subsystem. Additionally, the multi-effect distillation wastewater treatment subsystem also includes a makeup pump V. p An additional output is installed at the clean water collection line 31. The supplementary pump V is adjusted according to the working fluid flow rate in the high heat recovery circuit. p The first heat medium, namely water, is replenished to the first heat medium input section 5 as needed.

[0044] As described above, concentrated liquid and even concentrated solids are deposited at the bottom of each distillation chamber. In order to properly handle these concentrated liquids / concentrated solids, each distillation chamber is provided with a dedicated pipe for concentrated liquids / concentrated solids at its bottom. These pipes are fluidly connected to the concentrated liquid discharge pipe 30 so that the concentrated liquids / concentrated solids from each distillation chamber can be discharged to another predetermined collection point through the concentrated liquid discharge pipe 30.

[0045] During the process of recovering industrial waste heat, providing cooling capacity for the local environment, and desalinating wastewater using the industrial waste heat-driven jet refrigeration and wastewater treatment coupling system of this application, on the heating side, the efficiency of industrial waste heat utilization can be optimized by allocating the heat exchange stages of the medium / high heat recovery loop and regulating the flow rate of the heat medium in the associated subsystems; on the heat consumption side, the desalination efficiency is mainly optimized by regulating the flow rate of wastewater.

[0046] Furthermore, considering the dynamic supply and demand scenario of heating and cooling, both the jet refrigeration subsystem based on steam ejector thermal drive and the thermocompression-multi-effect distillation wastewater treatment subsystem operate under fluctuating conditions. These fluctuations may lead to a deterioration in the ejector performance of the steam ejector designed based on initial fixed conditions, thus significantly impacting the performance of the corresponding subsystems. Therefore, further collaborative optimization of the steam ejector performance is necessary. Here, two ejector performance enhancement technologies suitable for fluctuating conditions are introduced: auxiliary ejection and pressure field control. After adding auxiliary ejection or pressure field control schemes, the required performance enhancement schemes for each steam ejector under the corresponding fluctuating conditions can be determined using Fluent numerical simulation methods.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A coupled system for industrial waste heat-driven jet refrigeration and wastewater treatment, characterized in that, include: A waste heat gradient recovery subsystem includes a high heat recovery loop and a medium heat recovery loop. The high heat recovery loop has a first heat medium flowing therein and includes a first heat medium input section and a first heat medium output section. The medium heat recovery loop has a second heat medium flowing therein. A jet refrigeration subsystem includes a steam generator, a first steam ejector, and an evaporator. The jet refrigeration subsystem has a third heat medium flowing therein. The first steam ejector includes a first high-pressure steam inlet, a first low-pressure steam inlet, and a first mixed fluid outlet. The multi-effect distillation wastewater treatment subsystem includes a second steam ejector, a first-effect distillation chamber, and a condensation chamber. The second steam ejector includes a second high-pressure steam inlet, a second low-pressure steam inlet, and a second mixed fluid outlet. The first-effect distillation chamber and the condensation chamber each include their own heat exchange pipelines. Wherein, the first heat medium output section is fluidly connected to the second high-pressure steam inlet, the second mixed fluid outlet is fluidly connected to the inlet of the first heat exchange pipeline of the first-effect distillation chamber, the outlet of the first heat exchange pipeline is at least fluidly connected to the first heat medium input section, the outlet of the condensation heat exchange pipeline of the condensation chamber is fluidly connected to the second low-pressure steam inlet, the first mixed fluid outlet is fluidly connected to the steam generator and the evaporator respectively, the steam generator is fluidly connected to the first high-pressure steam inlet, the evaporator is fluidly connected to the first low-pressure steam inlet, the intermediate heat recovery circuit exchanges heat with a portion of the third heat medium in the steam generator, and the remaining portion of the third heat medium evaporates and absorbs heat in the evaporator.

2. The industrial waste heat-driven jet refrigeration and wastewater treatment coupling system according to claim 1, characterized in that, The jet refrigeration subsystem further includes a condenser, and the first mixed fluid outlet is fluidly connected to the steam generator and the evaporator through the condenser.

3. The industrial waste heat-driven jet refrigeration and wastewater treatment coupling system according to claim 2, characterized in that, The multi-effect distillation wastewater treatment subsystem also includes a wastewater inlet pipeline, and the third heat medium exchanges heat with the wastewater inlet pipeline in the condenser.

4. The industrial waste heat-driven jet refrigeration and wastewater treatment coupling system according to claim 2, characterized in that, A pump is further provided between the condenser and the steam generator, the pump being used to maintain the fluid pressure of a portion of the third heat medium.

5. The industrial waste heat-driven jet refrigeration and wastewater treatment coupling system according to claim 2, characterized in that, A throttling valve is further provided between the condenser and the evaporator, the throttling valve being used to reduce the fluid pressure of the remaining portion of the third heat medium.

6. The industrial waste heat-driven jet refrigeration and wastewater treatment coupling system according to claim 3, characterized in that, The intermediate heat recovery loop includes a second heat medium input section and a second heat medium output section. The second heat medium input section is equipped with a heat exchanger, and the second heat medium exchanges heat with the wastewater inlet pipeline in the heat exchanger.

7. The industrial waste heat-driven jet refrigeration and wastewater treatment coupling system according to claim 6, characterized in that, The multi-effect distillation wastewater treatment subsystem further includes several subsequent distillation chambers, each of which includes its own heat exchange pipeline, and the first-effect distillation chamber and each of the several subsequent distillation chambers each include a corresponding flash chamber. The first-effect distillation chamber, a plurality of subsequent-effect distillation chambers, and the condenser are sequentially fluidly connected. The first-effect distillation chamber and the plurality of subsequent-effect distillation chambers are each fluidly connected to the corresponding flash chamber. The corresponding flash chamber is fluidly connected to the heat exchange pipeline of the subsequent subsequent-effect distillation chamber or the condenser.

8. The industrial waste heat-driven jet refrigeration and wastewater treatment coupling system according to claim 7, characterized in that, Water vapor from the preceding follow-up distillation chamber and its corresponding flash chamber exchanges heat with the wastewater feed line in the condensation heat exchange line.

9. The industrial waste heat-driven jet refrigeration and wastewater treatment coupling system according to claim 8, characterized in that, The heat-exchanged wastewater is transported to the first-effect distillation chamber and several subsequent-effect distillation chambers, where heat exchange takes place in the corresponding heat exchange pipelines.

10. The industrial waste heat-driven jet refrigeration and wastewater treatment coupling system according to claim 6, characterized in that, In the waste heat gradient recovery subsystem, the first heat medium output section, the second heat medium output section, the first heat medium input section, and the second heat medium input section sequentially recover industrial waste heat in a cooling order.

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