Cold and hot separated heat supply system for thermal power plant

Abstract

The invention discloses a hot and cold separated heat supply system for a thermal power plant, comprising a vortex tube used for separating steam received by an input end, outputting the steam with the temperature greater than a temperature threshold from a first output end, and outputting the steam with the temperature less than or equal to the temperature threshold from a second output end; and the first cold supply heat exchanger communicates with the second output end of the vortex tube and is used for cooling the steam flowing through the first cold supply heat exchanger by using the steam with the temperature smaller than or equal to the temperature threshold value. The second cold supply heat exchanger is used for heating steam flowing through the second cold supply heat exchanger, and the supply device is used for supplying heat energy to the outside by using the steam flowing through the first cold supply heat exchanger. Steam is separated into a cold part and a hot part through the vortex tube, efficient utilization of energy is achieved, the first cold supply heat exchanger and the second cold supply heat exchanger are combined, low-temperature steam can be effectively utilized for cold and heat exchange, the energy utilization rate is increased, and energy consumption is reduced.

Description

Technical Field

[0001] The present application relates to the field of heating, and in particular to a heating system for separating heat from cold in a thermal power plant. Background Art

[0002] With the intensification of the energy crisis and the emergence of global warming, how to achieve clean and efficient energy development and utilization has received increasing attention. To achieve the above goals, the combined heat and power system using steam circulation has been widely used in industrial production. The steam circulation device uses high-pressure steam to generate kinetic energy to drive the compressor to rotate, drive the compressor to compress the sucked low-pressure steam, increase the pressure and send it into the steam circulation device, and continuously circulate the thermal energy of the steam to achieve efficient use of steam. In actual applications, the steam circulation device also needs to recover the heat generated by the compressor, and then use the heat generated by the compressor to heat the condensed water in the production process to reduce heat waste. Therefore, improving the utilization rate of the heat energy generated by the steam circulation loop has become the key to achieving efficient operation of the steam circulation system.

[0003] The refrigeration method in traditional steam cycle devices usually uses gas pressure regulation to reduce the temperature of the gas, but when faced with high load demand, it often shows poor refrigeration effect. This not only leads to a large amount of energy consumption and increases operating costs, but also due to low refrigeration efficiency, the system often takes longer to reach the required refrigeration temperature, prolonging the cooling time and affecting the overall performance of the refrigeration system and user experience. Summary of the invention

[0004] An embodiment of the present application provides a heat supply system for separating heat from cold in a thermal power plant.

[0005] According to one aspect of an embodiment of the present application, a heat supply system for separating cold and heat in a thermal power plant is provided, comprising a vortex tube, the vortex tube comprising an input end, a first output end, and a second output end, the vortex tube being used to separate the steam received at the input end, outputting the steam having a temperature greater than a temperature threshold from the first output end, and outputting the steam having a temperature less than or equal to the temperature threshold from the second output end; a first cooling heat exchanger, the first cooling heat exchanger being connected to the second output end of the vortex tube, and being used to utilize the steam having a temperature less than or equal to the temperature threshold to cool the steam flowing through the first cooling heat exchanger; a second cooling heat exchanger and a supply device, the second cooling heat exchanger, the first cooling heat exchanger, and the supply device being connected in sequence, the second cooling heat exchanger being used to utilize the steam flowing through the first cooling heat exchanger to heat the steam flowing through the second cooling heat exchanger, and the supply device being used to utilize the steam flowing through the first cooling heat exchanger to supply heat energy to the outside.

[0006] In one embodiment of the present application, the system also includes a steam extraction and injection device, which is connected to the input end of the vortex tube and is used to provide steam for the input end of the vortex tube; the second cooling heat exchanger includes a second circulation pipeline and a second heat exchange pipeline, the first end of the second circulation pipeline is connected to the first output end of the vortex tube, and the second end of the second circulation pipeline is connected to the steam extraction and injection device, wherein the steam extraction and injection device, the second cooling heat exchanger, and the vortex tube constitute a first steam cycle.

[0007] In one embodiment of the present application, the first cooling heat exchanger includes a first circulation pipeline and a first heat exchange pipeline, the first end of the first heat exchange pipeline is connected to the second output end of the vortex tube, the first end of the first circulation pipeline is connected to the first end of the second heat exchange pipeline, and the second end of the first circulation pipeline is connected to the supply device, wherein the first heat exchange pipeline is used to exchange temperature with the first circulation pipeline, wherein the first cooling heat exchanger, the second cooling heat exchanger, and the supply device constitute a second steam cycle.

[0008] In one embodiment of the present application, the system further includes a condenser, which is connected to the second end of the first heat exchange pipeline and is used to recover heat energy of the steam transmitted by the second end of the first heat exchange pipeline.

[0009] In one embodiment of the present application, the system also includes a hot water storage tank, which is connected to the first output end of the vortex tube and is used to receive steam with a temperature greater than a temperature threshold; the hot water storage tank is also connected to the supply device through two passages, respectively, wherein the hot water storage tank and the supply device constitute a third steam cycle.

[0010] In one embodiment of the present application, the system further comprises a first circulation pump, which is arranged on a passage connecting the hot water storage tank and the supply device, and is used to drive the steam circulation.

[0011] In one embodiment of the present application, the system further comprises a first valve, which is arranged on a passage connecting the hot water storage tank and the supply device, and is used to cut off the third steam cycle when closed.

[0012] In one embodiment of the present application, the system also includes a second valve, a first end of the second valve is connected to the first end of the second cooling heat exchanger, and a second end of the second valve is connected to the second end of the second cooling heat exchanger, for bypassing the second cooling heat exchanger when closed.

[0013] In one embodiment of the present application, the system also includes a waste steam heat recovery heat exchanger, which includes a third circulation pipeline, a first end of the third circulation pipeline is connected to the steam extraction and injection device, and a second end of the third circulation pipeline is connected to the condenser, for transferring the waste steam generated by the steam extraction and injection device to the condenser for recovery.

[0014] In one embodiment of the present application, the system also includes a third valve, a first end of the third valve is connected to the first end of the third circulation pipeline, and a second end of the third valve is connected to the second end of the third circulation pipeline, for bypassing the exhaust steam heat recovery exchanger when closed.

[0015] The above-mentioned heating system for separating hot and cold in thermal power plants separates steam into hot and cold parts through vortex tubes, thereby realizing efficient use of energy. By using vortex tubes, heat energy and cold energy can be effectively separated and utilized, thus avoiding energy waste caused by directly discharging cold steam. Hot steam can be further used to heat water in the heat storage buffer tank or directly supplied to hot users, while cold steam can be used to cool the return water of the heat network or supplied to cold users, thereby improving the overall energy utilization efficiency of the system. Through the first cold supply heat exchanger, the cold energy generated by the vortex tube can be effectively utilized to supply cold energy to users or assist the condensation process, thereby reducing the operating load of cooling devices such as cooling towers, reducing the temperature of cooling water, and further improving the exhaust steam recovery efficiency and the overall thermal economy of the system. At the same time, by utilizing the heat energy and cold energy of steam in stages, more efficient use of energy is realized. The design of the second cold supply heat exchanger and the supply device realizes the multi-level utilization of steam energy and improves the thermal efficiency of the entire system. After the cold steam releases cold energy in the first cooling heat exchanger, its residual heat energy can be effectively recovered in the second cooling heat exchanger to provide heat energy to the outside, avoiding direct heat discharge and energy waste. In summary, the vortex tube separates the steam into two parts, cold and hot, to achieve efficient energy utilization. Combined with the first cooling heat exchanger and the second cooling heat exchanger, low-temperature steam can be effectively used for cold and heat exchange, improving energy utilization, reducing energy consumption, and achieving multiple refrigeration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 It is a structural block diagram of a heat supply system for heat and cold separation in a thermal power plant according to an embodiment of the present application;

[0019] Figure 2 It is a structural schematic diagram of a heating system for separating heat and cold in a thermal power plant according to an embodiment of the present application.

[0020] Description of reference numerals:

[0021] 10-vortex tube, 20-first cooling heat exchanger, 30-second cooling heat exchanger, 40-supply device, 50-steam extraction and injection device, 60-condenser, 70-heat storage tank, 81-first circulation pump, 82-first valve, 83-second valve, 90-exhaust steam heat recovery heat exchanger, 84-third valve. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, the process, method, system, product or equipment comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0027] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is transmission of electrical signals or data between the connected objects.

[0028] In this embodiment, a heat supply system for separating heat from cold in a thermal power plant is provided. Figure 1 It is a structural diagram of an optional heat supply system for heat and cold separation of a thermal power plant according to an embodiment of the present application, comprising: a vortex tube 10, a first cold supply heat exchanger 20, a second cold supply heat exchanger 30 and a supply device 40, wherein:

[0029] The vortex tube 10 includes an input end, a first output end, and a second output end. The vortex tube 10 is used to separate the steam received at the input end, output steam with a temperature greater than a temperature threshold from the first output end, and output steam with a temperature less than or equal to the temperature threshold from the second output end.

[0030] Specifically, the vortex tube 10 is a heat separation device without moving parts, and its internal design allows a high-speed rotating vortex to be generated after the high-pressure gas enters. During the rotation process, the gas is separated into two streams: a hot flow with a higher temperature and a cold flow with a lower temperature. The hot flow is discharged from the first output end (hot end outlet), and the cold flow is discharged from the second output end (cold end outlet). In the present invention, the vortex tube 10 receives steam from the ejector, and uses the pressure energy of the steam to separate the steam into hot steam with a temperature higher than a certain threshold and cold steam with a temperature lower than or equal to the threshold through an internal rotating flow separation process.

[0031] The first cooling heat exchanger 20 is connected to the second output end of the vortex tube 10 and is used to cool the steam flowing through the first cooling heat exchanger 20 by using the steam with a temperature less than or equal to the temperature threshold.

[0032] Specifically, the first cooling heat exchanger 20 is connected to the second output end (cold end outlet) of the vortex tube 10, and its function is to use the cold steam generated by the vortex tube 10 to cool the return water of the hot network flowing through the heat exchanger, so as to provide cooling for users or assist the condenser 60. The design of the heat exchanger allows heat exchange to occur between the cold steam and the return water of the hot network. The cold steam releases heat and lowers the temperature, while the return water of the hot network absorbs heat and raises the temperature, thereby achieving cascade utilization of energy.

[0033] The second cooling heat exchanger 30, the first cooling heat exchanger 20, and the supply device 40 are connected in sequence. The second cooling heat exchanger 30 is used to utilize the steam flowing through the first cooling heat exchanger 20 to increase the temperature of the steam flowing through the second cooling heat exchanger 30, and the supply device 40 is used to utilize the steam flowing through the first cooling heat exchanger 20 to supply heat energy to the outside.

[0034] Specifically, the second cooling heat exchanger 30 is connected with the first cooling heat exchanger 20 and the supply device 40 in sequence, and its function is to use the steam pre-cooled by the first cooling heat exchanger 20 to further heat the return water or other fluid flowing through the second cooling heat exchanger 30, thereby improving the utilization efficiency of thermal energy. The supply device 40 is used to supply the heated fluid to external heat users to meet the needs of heat users. The whole process realizes the transfer and distribution of heat through the pipe connection and valve control between the heat exchangers.

[0035] In this embodiment, the steam is separated into hot and cold parts by the vortex tube 10, so that the efficient use of energy is achieved. By using the vortex tube 10, the heat energy and cold energy can be effectively separated and utilized, avoiding the energy waste caused by the direct discharge of cold steam. The hot steam can be further used to heat the water in the heat storage buffer tank or directly supplied to the heat user, while the cold steam can be used to cool the return water of the heat network or supply the cold user, thereby improving the overall energy utilization efficiency of the system. Through the first cold supply heat exchanger 20, the cold energy generated by the vortex tube 10 can be effectively utilized to supply cold energy to the user or assist the condensation process, thereby reducing the operating load of cooling devices such as cooling towers, reducing the temperature of cooling water, and further improving the exhaust steam recovery efficiency and the overall thermal economy of the system. At the same time, by utilizing the heat energy and cold energy of steam in stages, more efficient use of energy is achieved. The design of the second cold supply heat exchanger 30 and the supply device 40 realizes the multi-level utilization of steam energy and improves the thermal efficiency of the entire system. After the cold steam releases cold energy in the first cooling heat exchanger 20, its residual heat energy can be effectively recovered in the second cooling heat exchanger 30 to provide heat energy to the outside, avoiding direct heat discharge and energy waste. In summary, the vortex tube 10 separates the steam into two parts, cold and hot, to achieve efficient use of energy. Combined with the first cooling heat exchanger 20 and the second cooling heat exchanger 30, low-temperature steam can be effectively used for cold and heat exchange, thereby improving energy utilization, reducing energy consumption, and achieving multiple refrigeration.

[0036] In one embodiment, please continue to see Figure 1 The heat supply system for heat and cold separation of thermal power plants further includes: a steam extraction and injection device 50. The steam extraction and injection device 50 is communicated with the input end of the vortex tube 10, and is used to provide steam for the input end of the vortex tube 10.

[0037] The steam extraction and injection device 50 is a device that utilizes the pressure energy of steam to inject steam into the vortex tube 10 for separation.

[0038] The second cooling heat exchanger 30 includes a second circulation pipeline and a second heat exchange pipeline. The first end of the second circulation pipeline is connected to the first output end of the vortex tube 10 , and the second end of the second circulation pipeline is connected to the steam extraction and ejection device 50 .

[0039] The steam extraction and injection device 50, the second cooling heat exchanger 30, and the vortex tube 10 constitute a first steam cycle.

[0040] The second cooling heat exchanger 30 is connected to the first output end (hot end outlet) of the vortex tube 10 through the second circulation pipeline and the second heat exchange pipeline inside it, and is used to absorb the heat of the hot steam from the vortex tube 10 and transfer this part of the heat to other fluids, such as water supply from the heating network, so as to further utilize the thermal energy. The second circulation pipeline is responsible for the flow in and out of the hot steam, while the second heat exchange pipeline is used for heat exchange with other fluids. The second cooling heat exchanger 30, the steam extraction and ejection device 50, and the vortex tube 10 together constitute the first steam cycle, so that the energy of the steam can be utilized in stages, thereby improving the overall thermal efficiency of the system.

[0041] The first steam cycle refers to obtaining steam from the steam extraction and ejection device 50, sending the steam into the vortex tube 10 through the ejection effect, and after energy separation in the vortex tube 10, the hot steam enters the second cooling heat exchanger 30 for heat exchange, and returns to the steam extraction and ejection device 50 after releasing heat, and the cold steam enters the first cooling heat exchanger 20 for cold exchange. The whole cycle realizes the efficient utilization and recovery of steam energy, including the extraction of heat energy and the utilization of cold energy.

[0042] In this embodiment, the steam extraction and ejection device 50 can effectively utilize the energy of high-pressure steam, avoid the extra energy consumption and complexity caused by the use of equipment such as electric pumps, simplify the system structure, and improve the operating efficiency and economy of the system. In addition, the steam extraction and ejection device 50 can quickly respond to load changes and improve the flexibility of the system. Through the second cooling heat exchanger 30, the heat of the hot steam separated by the vortex tube 10 can be fully utilized, the waste of energy can be reduced, and the economy and environmental protection of the system energy utilization can be improved. At the same time, it can provide a stable supply of heat energy for heat users, and improve the heat energy supply capacity and service quality of the system.

[0043] In one embodiment, please continue to see Figure 1 The first cooling heat exchanger 20 includes a first circulation pipeline and a first heat exchange pipeline, the first end of the first heat exchange pipeline is connected to the second output end of the vortex tube 10, the first end of the first circulation pipeline is connected to the first end of the second heat exchange pipeline, and the second end of the first circulation pipeline is connected to the supply device 40, wherein the first heat exchange pipeline is used to exchange temperature with the first circulation pipeline, wherein the first cooling heat exchanger 20, the second cooling heat exchanger 30, and the supply device 40 constitute a second steam cycle.

[0044] Specifically, the first cooling heat exchanger 20 is a key component for the cooling process in the system, and it includes a first circulation pipeline and a first heat exchange pipeline. The first heat exchange pipeline is connected to the second output end (i.e., the cold end outlet) of the vortex tube 10 to receive the cold steam separated by the vortex tube 10. The first circulation pipeline is used for the circulation of fluid (such as heat network return water), and its first end is connected to the first end of the second heat exchange pipeline, and the second end is connected to the external supply device 40. In the first cooling heat exchanger 20, the cold steam exchanges heat with the fluid in the circulation pipeline through the first heat exchange pipeline, so that the fluid is cooled. This design allows the cold energy of the cold steam to be effectively recovered and utilized.

[0045] Specifically, in the second steam cycle, the second cooling heat exchanger 30 is connected to the first circulation pipeline of the first cooling heat exchanger 20 through the second heat exchange pipeline inside it, receives the fluid precooled by the first cooling heat exchanger 20, and further heats it for use by heat users. The design of the second cooling heat exchanger 30 enables the precooled fluid to absorb heat again before entering the final supply device 40, thereby improving the utilization efficiency of thermal energy. The second steam cycle includes a continuous energy transfer process between the first cooling heat exchanger 20, the second cooling heat exchanger 30 and the supply device 40. In this cycle, the cold steam separated by the vortex tube 10 exchanges heat with the fluid in the first circulation pipeline in the first cooling heat exchanger 20, thereby reducing the temperature of the fluid; then, the cooled fluid absorbs heat again in the second cooling heat exchanger 30, and finally delivers the fluid to the heat user through the supply device 40. The design of the second steam cycle revolves around the cold energy recovery of the cold steam and the cascade utilization of the fluid heat, effectively improving the overall thermal efficiency of the system.

[0046] In this embodiment, the first cooling heat exchanger 20 can not only effectively recover the cold energy in the cold steam, but also provide cold energy for the system through heat exchange with the circulating fluid, meet the needs of cold users or assist the condenser 60 in operation. This cascade utilization of cold and hot energy can not only improve the overall thermal efficiency of the system, but also reduce the dependence on cooling facilities such as cooling towers, reduce the operating costs and environmental impact of the system. The second steam cycle realizes the multi-level utilization of energy by cascading the cold energy of the cold steam and the waste heat of the pre-cooled fluid, reduces energy waste, and improves the thermal efficiency and economic benefits of the system. In addition, the second steam cycle enhances the flexibility of the system, can adapt to different cold and hot load requirements, and is conducive to the stable operation of the system and the improvement of market competitiveness.

[0047] In one embodiment, Figure 2 As shown, the system further includes: a condenser 60, which is connected to the second end of the first heat exchange pipeline and is used to recover the heat energy of the steam transmitted by the second end of the first heat exchange pipeline.

[0048] Specifically, the main function of the condenser 60 is to condense the exhaust steam (hot steam) discharged from the steam turbine into water by heat exchange with the circulating cooling water, and recover the heat energy of the steam. The condenser 60 is connected to the second end of the first heat exchange pipeline and receives the steam cooled by the first cooling heat exchanger 20. The steam loses most of its heat energy in the condenser 60, so the temperature can be further reduced in the condenser 60 until it is condensed into water.

[0049] In this embodiment, by using the condenser 60 in the system, the heat energy of the steam can be effectively recovered, the direct emission of heat can be reduced, and the energy utilization efficiency can be improved.

[0050] In one embodiment, please continue to see Figure 2 The above system also includes: a hot water storage tank 70.

[0051] The hot water storage tank 70 is in communication with the first output end of the vortex tube 10 for receiving steam with a temperature greater than a temperature threshold.

[0052] The hot water storage tank 70 is also connected to the supply device 40 through two passages.

[0053] The hot water storage tank 70 and the supply device 40 constitute a third steam cycle.

[0054] Specifically, the hot water storage tank 70 plays a dual role of energy storage and heat supply in the present technical solution. It is directly connected to the first output end (hot end outlet) of the vortex tube 10, and is used to receive and store steam with a temperature higher than the preset temperature threshold. These high-temperature steams exchange heat with the water in the hot water storage tank 70, heat the water to the required temperature, and form hot water resources. The capacity design of the hot water storage tank 70 fully considers the maximum heat load and heat recovery capacity of the system, and can provide a stable heat source at the peak of the heat load, and store excess heat energy at the trough of the heat load. Two passages connecting the hot water storage tank 70 and the supply device 40 ensure the flexible supply of hot water. One passage is used to directly send the hot water in the hot water storage tank 70 to the supply device 40 to meet the immediate heat demand; the other passage is the connection between the hot water storage tank 70 and the second cooling heat exchanger 30, and after further heating, it is sent to the supply device 40 to meet the higher temperature heat demand. The hot water storage tank 70 can be used for cross-seasonal heat storage.

[0055] Specifically, the third steam cycle is an independent energy flow path formed between the hot water storage tank 70 and the supply device 40. In this cycle, the hot water storage tank 70 receives high-temperature steam from the vortex tube 10. After the steam exchanges heat with the water in the hot water storage tank 70, the water is heated to a higher temperature. Subsequently, this part of the hot water is directly sent to the supply device 40 through one of the two pathways for use by external heat users. If it is through the second pathway, the hot water will first be further heated by the second cooling heat exchanger 30, and then sent to the supply device 40 to meet higher thermal energy requirements. This circulation mode ensures the efficient use and storage of thermal energy, while also providing flexible heat source options for heat users with different temperature requirements.

[0056] Exemplarily, the heat storage tank 70 is generally in the shape of a cylinder, a cuboid, or an inverted pyramid, with a peakless inverted pyramid being preferred. The design size depends on the unit size, steam extraction volume and parameters, exhaust steam volume and temperature, local average temperature, water tank insulation conditions, etc. It should generally cover the entire heating season or the peak heating season. At the end of the heating season or the peak heating season, the temperature in the water intake area is higher than 30°C. The use of the end of the heating season or the peak heating season depends on the local heat price, the total scale of the local thermal power plant, and cost-effectiveness calculations.

[0057] In this embodiment, the establishment of the hot water storage tank 70 provides a reliable thermal energy reserve for the system and enhances the system's thermal load adaptability. By storing the heat of high-temperature steam, it can respond quickly at the peak of the thermal load, avoiding energy shortages or system instability caused by excessive instantaneous heat demand. At the same time, as an energy storage unit, the hot water storage tank 70 can store excess thermal energy when the thermal load is low, reducing energy waste and improving energy utilization efficiency.

[0058] In one embodiment, please continue to see Figure 2The system further includes: a first circulation pump 81. The first circulation pump 81 is disposed on a passage connecting the hot water storage tank 70 and the supply device 40, and is used to drive the steam circulation.

[0059] Specifically, the first circulation pump 81 is a key device for maintaining hot water circulation in the system, and is arranged on a passage connecting the hot water storage tank 70 and the supply device 40. Its main function is to drive the hot water to circulate between the hot water storage tank 70 and the supply device 40.

[0060] In this embodiment, the provision of the first circulation pump 81 ensures a smooth supply of hot water and improves the thermal energy distribution efficiency of the system.

[0061] In one embodiment, please continue to see Figure 2 The system further includes: a first valve 82. The first valve 82 is disposed on a passage connecting the hot water storage tank 70 and the supply device 40, and is used to cut off the third steam cycle when closed.

[0062] Specifically, the first valve 82 is located on the communication path between the hot water storage tank 70 and the supply device 40, and is used to control the opening and closing of the third steam cycle. When closed, the first valve 82 cuts off the path for the hot water storage tank 70 to deliver hot water to the supply device 40, which means that the third steam cycle is interrupted and hot water cannot flow through the path. The opening and closing state of the first valve 82 can be adjusted according to the system operation mode or the change of external heat demand.

[0063] In this embodiment, the setting of the first valve 82 provides the system with the ability to switch the operating mode. When hot water does not need to be directly supplied through the hot water storage tank 70, the first valve 82 can be closed to avoid unnecessary energy consumption. In addition, through the control of the first valve 82, the system can respond quickly in maintenance or fault conditions, protect the system from damage, and enhance the safety and reliability of the system.

[0064] In one embodiment, please continue to see Figure 2 The system further includes: a second valve 83. A first end of the second valve 83 is communicated with a first end of the second cooling heat exchanger 30, and a second end of the second valve 83 is communicated with a second end of the second cooling heat exchanger 30, for bypassing the second cooling heat exchanger 30 when closed.

[0065] Specifically, a bypass is provided between the second valve 83 and the second cooling heat exchanger 30, and its design purpose is to bypass the second cooling heat exchanger 30 when necessary and directly transport the fluid from one end of the heat exchanger to the other end. When the second valve 83 is in a closed state, the fluid does not flow through the second cooling heat exchanger 30, but is directly transported through the bypass of the second valve 83. This design enables the system to flexibly adjust the use status of the heat exchanger according to actual needs.

[0066] In this embodiment, the second valve 83 is provided to improve the operational flexibility of the system. When the second cooling heat exchanger 30 needs maintenance or the system does not need to further increase the hot water temperature through the heat exchanger, the second valve 83 can be closed to bypass the heat exchanger, thereby avoiding unnecessary energy loss and complex system operation. At the same time, this design also improves the system's adaptability to different working conditions and enhances the system's stable operation and maintenance convenience.

[0067] In one embodiment, please continue to see Figure 2 The system further includes: an exhaust steam heat recovery heat exchanger 90. The exhaust steam heat recovery heat exchanger 90 includes a third circulation pipeline, a first end of the third circulation pipeline is connected to the steam extraction and ejection device 50, and a second end of the third circulation pipeline is connected to the condenser 60, for transferring the exhaust steam generated by the steam extraction and ejection device 50 to the condenser 60 for recovery.

[0068] Specifically, the exhaust steam heat recovery heat exchanger 90 is a device for recovering the exhaust steam heat generated by the extraction and ejection device 50, and comprises a third circulation pipeline, one end of which is connected to the extraction and ejection device 50, and the other end of which is connected to the condenser 60. The exhaust steam is ejected in the extraction and ejection device 50 and transferred to the exhaust steam heat recovery heat exchanger 90, where the heat of the exhaust steam is recovered, and then the exhaust steam is sent to the condenser 60 for further cooling and condensation. This process realizes the effective utilization of the exhaust steam heat and reduces the waste of energy.

[0069] In this embodiment, the exhaust steam heat recovery heat exchanger 90 is provided to improve the heat recovery efficiency of the system. By recovering and reusing the heat energy in the exhaust steam, the energy consumption of the system is reduced, and the operating cost is reduced. In addition, by transferring the exhaust steam heat to the condenser 60, it helps to improve the cooling efficiency of the condenser 60, reduce the dependence on cooling water, and is of great significance to energy saving and emission reduction and improving the thermal economy of the system.

[0070] In one embodiment, please continue to see Figure 2 The system further includes a third valve 84. A first end of the third valve 84 is connected to a first end of the third circulation pipeline, and a second end of the third valve 84 is connected to a second end of the third circulation pipeline, for bypassing the exhaust steam heat recovery heat exchanger 90 when closed.

[0071] Specifically, the third valve 84 is located on the communication path between the exhaust steam heat recovery heat exchanger 90 and the steam extraction ejector 50 and the condenser 60, and is designed to bypass the exhaust steam heat recovery heat exchanger 90 when necessary. When the third valve 84 is in a closed state, the exhaust steam does not flow through the exhaust steam heat recovery heat exchanger 90, but flows directly from one end of the heat exchanger to the other end, and finally enters the condenser 60. This design enables the system to flexibly adjust the flow path of the exhaust steam according to external conditions or operation requirements, thereby improving the operation flexibility of the system.

[0072] In this embodiment, the setting of the third valve 84 provides the system with the ability to control the exhaust steam heat recovery heat exchanger 90. When the heat exchanger needs maintenance or the system does not need to recover the exhaust steam heat energy, the third valve 84 can be closed to send the exhaust steam directly to the condenser 60, avoiding unnecessary operation of the heat exchanger, reducing the maintenance cost and operation complexity of the system, and enhancing the stable operation and thermal economy of the system. This design also improves the system's adaptability to different operating conditions and ensures the efficient and flexible operation of the system.

[0073] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0074] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A heat supply system for heat and cold separation in a thermal power plant, characterized in that: include: A vortex tube, the vortex tube comprising an input end, a first output end, and a second output end, the vortex tube is used to separate the steam received at the input end, output the steam with a temperature greater than a temperature threshold from the first output end, and output the steam with a temperature less than or equal to the temperature threshold from the second output end; a first cooling heat exchanger, the first cooling heat exchanger being in communication with the second output end of the vortex tube, and being used for cooling the steam flowing through the first cooling heat exchanger by using the steam having a temperature less than or equal to the temperature threshold; A second cooling heat exchanger and a supply device, wherein the second cooling heat exchanger, the first cooling heat exchanger and the supply device are connected in sequence, the second cooling heat exchanger is used to utilize the steam flowing through the first cooling heat exchanger to heat the steam flowing through the second cooling heat exchanger, and the supply device is used to utilize the steam flowing through the first cooling heat exchanger to supply heat energy to the outside.

2. The heat supply system for heat and cold separation in a thermal power plant according to claim 1, characterized in that: The system further comprises: A steam extraction and injection device, the steam extraction and injection device is communicated with the input end of the vortex tube and is used to provide steam to the input end of the vortex tube; The second cooling heat exchanger includes a second circulation pipeline and a second heat exchange pipeline, the first end of the second circulation pipeline is connected to the first output end of the vortex tube, and the second end of the second circulation pipeline is connected to the steam extraction and injection device, wherein the steam extraction and injection device, the second cooling heat exchanger, and the vortex tube constitute a first steam cycle.

3. The heat supply system for heat and cold separation in a thermal power plant according to claim 2, characterized in that: The first cooling heat exchanger includes a first circulation pipeline and a first heat exchange pipeline, the first end of the first heat exchange pipeline is connected to the second output end of the vortex tube, the first end of the first circulation pipeline is connected to the first end of the second heat exchange pipeline, and the second end of the first circulation pipeline is connected to the supply device, wherein the first heat exchange pipeline is used to exchange temperature with the first circulation pipeline, wherein the first cooling heat exchanger, the second cooling heat exchanger, and the supply device constitute a second steam cycle.

4. The heat supply system for heat and cold separation in a thermal power plant according to claim 3, characterized in that: The system further comprises: A condenser is connected to the second end of the first heat exchange pipeline and is used to recover heat energy of the steam transmitted by the second end of the first heat exchange pipeline.

5. The heat supply system for heat and cold separation in a thermal power plant according to any one of claims 1 to 4, characterized in that: The system further comprises: a hot water storage tank, the hot water storage tank being in communication with the first output end of the vortex tube and being used for receiving the steam having a temperature greater than a temperature threshold; The hot water storage tank is also connected to the supply device through two passages respectively, wherein the hot water storage tank and the supply device constitute a third steam cycle.

6. The heat supply system for heat and cold separation in a thermal power plant according to claim 5, characterized in that: The system further comprises: The first circulation pump is arranged on a passage connecting the hot water storage tank and the supply device, and is used for driving the steam circulation.

7. The heat supply system for heat and cold separation in a thermal power plant according to claim 5, characterized in that: The system further comprises: The first valve is arranged on a passage connecting the hot water storage tank and the supply device, and is used to cut off the third steam cycle when closed.

8. The heat supply system for heat and cold separation in a thermal power plant according to any one of claims 1 to 4, characterized in that: The system further comprises: A second valve, wherein a first end of the second valve is connected to a first end of the second cooling heat exchanger, and a second end of the second valve is connected to a second end of the second cooling heat exchanger, and is used to bypass the second cooling heat exchanger when closed.

9. The heat supply system for heat and cold separation in a thermal power plant according to claim 4, characterized in that: The system further comprises: An exhaust steam heat recovery heat exchanger, wherein the exhaust steam heat recovery heat exchanger comprises a third circulation pipeline, a first end of the third circulation pipeline is connected to the steam extraction and injection device, and a second end of the third circulation pipeline is connected to the condenser, for transferring the exhaust steam generated by the steam extraction and injection device to the condenser for recovery.

10. The heat supply system for heat and cold separation in a thermal power plant according to claim 9, characterized in that: The system further comprises: A third valve, wherein a first end of the third valve is connected to a first end of the third circulation pipeline, and a second end of the third valve is connected to a second end of the third circulation pipeline, and is used to bypass the exhaust steam heat recovery heat exchanger when closed.

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