Cold and heat source combined supply system based on converter valve waste heat gradient utilization

Abstract

The cold and heat source combined supply system based on converter valve waste heat gradient utilization comprises a filter, a converter valve, a degassing tank, a main circulating water pump, a first electric gate valve, a second electric gate valve and an electric three-way valve which are connected in sequence. The two ends of the electric three-way valve are connected with the absorption type refrigerating system and the spraying water system in series through the electric adjusting valve and the first one-way valve respectively, the two ends of the first electric gate valve are connected with the air cooling system, the two ends of the second electric gate valve are connected with the radiation heating system, and the two ends of the converter valve are connected with the auxiliary circulation loop. The internal cooling water flow direction in the main circulation loop is changed by controlling opening and closing of the first electric gate valve, the second electric gate valve and the electric three-way valve, heat exchange with different terminals is achieved, waste heat of the converter valve is effectively utilized in different seasons, and energy waste is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of converter valves, and in particular is a cold and heat source cogeneration system based on cascaded utilization of waste heat from converter valves. Background Art

[0002] As key electrical equipment in HVDC converter stations, converter valves generate a large amount of heat during operation, so a large number of cooling systems are required to remove the heat and prevent the components on the converter valves from being damaged due to overheating. Existing HVDC converter stations are generally cooled by air or cooling towers to discharge a large amount of heat generated during the operation of the converter valves into the atmosphere to ensure operational stability and service life.

[0003] The heat generated by the converter valve is huge. Currently, the heat is discharged into the atmosphere through air cooling or cooling tower cooling, resulting in huge energy waste. When the converter valve is actually in operation, due to the low outdoor temperature in winter, outdoor pipes and equipment need to be heated. At the same time, rooms in the complex building need heating in winter and cooling in summer.

[0004] Based on this, how to effectively utilize the waste heat of the converter valve and reduce energy waste is a problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a cold and heat source cogeneration system based on the cascade utilization of waste heat from converter valves.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A cold and heat source cogeneration system based on the cascade utilization of waste heat from converter valves, comprising a filter, a converter valve, a degassing tank, a main circulation water pump, a No. 1 electric gate valve, a No. 2 electric gate valve, and an electric three-way valve connected in sequence, wherein both ends of the electric three-way valve are connected in series with an absorption refrigeration system and a spray water system via an electric regulating valve and a first non-return valve, both ends of the No. 1 electric gate valve are connected to an air cooling system, both ends of the No. 2 electric gate valve are connected to a radiant heating system, and both ends of the converter valve are connected to an auxiliary circulation loop.

[0008] Preferably, a degassing tank is provided at the outlet end of the converter valve and the inlet end of the main circulation water pump in the main circulation loop, and an electric gate valve No. 1, an electric gate valve No. 2, an electric three-way valve, an electric regulating valve, a first one-way valve, and a filter are provided at the inlet end of the converter valve and the outlet end of the main circulation water pump. Two main circulation pumps are provided, one for use and one for backup, for providing power to the system. The degassing tank is used to stabilize the water pressure in the pipeline. The electric gate valve No. 1, the electric gate valve No. 2, and the electric three-way valve are used to change the water flow direction inside the system. The electric regulating valve is used to adjust the amount of internal cooling water. The first one-way valve is used to prevent the water flow in the pipeline from backflowing, and the filter is used to treat impurities in the water.

[0009] Preferably, the absorption refrigeration system includes an absorbent cycle and a refrigerant cycle, the absorbent cycle is a positive cycle, and the refrigerant cycle is a reverse cycle, the positive cycle includes a generator, an absorber, a solution pump, and a pressure reducing valve, and the reverse cycle includes a condenser, an evaporator, and an expansion valve;

[0010] One end of the generator is connected to the plate heat exchanger, and the other end of the generator is connected to the absorber. The generator is used to absorb heat from the plate heat exchanger to heat the working fluid pair of the absorption refrigeration system, i.e., the refrigerant-absorbent solution, to boil, wherein the refrigerant with a low boiling point is vaporized to form a high-pressure gaseous refrigerant. The absorber is used to release heat to the outside and absorb the low-pressure gaseous refrigerant with a liquid absorbent.

[0011] Preferably, a solution pump and a pressure reducing valve are provided between the generator and the absorber, the solution pump is used to pressurize the refrigerant-absorbent solution in a low-pressure state and then allow it to enter the generator, and the pressure reducing valve is used to depressurize the absorbent solution in a high-pressure state and then allow it to enter the absorber;

[0012] The generator is connected to the condenser, the absorber is connected to the evaporator, an expansion valve is provided between the condenser and the evaporator, the condenser is used to release heat to the outside to liquefy the high-pressure gaseous refrigerant from the generator, the expansion valve is used to reduce the pressure and cool the refrigerant, and the evaporator is used to absorb heat from the outside to vaporize the refrigerant into low-pressure steam.

[0013] Preferably, the air cooling system includes an air cooling heat exchanger, one end of the air cooling heat exchanger is provided with a No. 1 electric butterfly valve and a No. 1 temperature sensor, the other end of the air cooling heat exchanger is provided with a second one-way valve, an electric regulating valve, and a No. 2 temperature sensor, the No. 1 electric butterfly valve is used for pipeline maintenance, the second one-way valve is used to prevent water flow in the pipeline from flowing back, the electric regulating valve is used to adjust the water volume in the pipeline, and the No. 1 temperature sensor and the No. 2 temperature sensor are used to monitor changes in water temperature in the pipeline;

[0014] The air-cooled heat exchanger is connected to the heat transport pipeline and is used to transport the heated outdoor air to the outdoor pipeline and equipment in winter to prevent the cold water temperature inside the pipeline or equipment from falling below 0°C due to the low ambient temperature, causing the pipeline to freeze and crack.

[0015] Preferably, the spray water system is a non-closed circulating water system, which includes a spray tower, a spray pump, a buffer water tank, a dosing pump, a water treatment tank, a No. 2 electric butterfly valve, a No. 7 temperature sensor, and a No. 8 temperature sensor. The spray tower is equipped with a spray device and a variable frequency cooling fan. The spray device uses spray water to cool the internal cooling water from the valve hall. The variable frequency cooling fan is used to discharge the steam generated in the process. Two spray pumps are provided, one for use and one for backup, for transporting spray water to the spray tower. The raw water is treated with dosing in the water treatment tank to ensure that the water quality of the external cooling water meets the standard. Two make-up water pumps are provided, one for use and one for backup. When the water level in the buffer water tank is low, the make-up water pump is turned on. The No. 2 electric butterfly valve is used to facilitate pipeline maintenance. The No. 7 temperature sensor and the No. 8 temperature sensor are used to monitor the water temperature.

[0016] Preferably, a filter is provided at the outlet end of the ion exchanger in the auxiliary circulation loop, and an expansion tank and a nitrogen tank are provided at the outlet end of the filter, the ion exchanger and the filter are used to treat impurities in part of the water in the main circulation loop, and the expansion tank and the nitrogen tank are used to buffer the water volume change of the main circulation loop, while isolating the air and maintaining a constant pressure;

[0017] A water replenishment pump and a water replenishment tank are arranged at the inlet bypass of the ion exchanger. Two water replenishment pumps are arranged, one for use and one for standby, for replenishing the water in the water replenishment tank into the system.

[0018] Preferably, the radiant heating system includes a plate heat exchanger, one end of the plate heat exchanger is provided with a No. 3 electric butterfly valve, a third one-way valve, an electric regulating valve, a No. 3 temperature sensor, and a No. 4 temperature sensor, and the other end of the plate heat exchanger is provided with a heat recovery circulation pump and a filter, the No. 3 electric butterfly valve is used to facilitate pipeline maintenance, the third one-way valve is used to prevent water flow back, the electric regulating valve is used to adjust the water volume in the pipeline, the temperature sensor is used to monitor changes in water temperature in the pipeline, the heat recovery circulation pump is used to provide power for the radiant heating system, and the filter is used to remove impurities in the water in the radiant heating system.

[0019] Preferably, a water make-up circuit is provided between the plate heat exchanger and the heat recovery circulation pump, and the water make-up circuit includes a water make-up tank, a water make-up pump, and an expansion tank. The water make-up tank is used to replenish the water lost due to leakage of pipes, valves and other equipment during the operation of the radiant heating system. The water make-up pump is used to provide power to the radiant heating system, and the expansion tank is used to store water.

[0020] Preferably, the plate heat exchanger transfers the heat generated by the operation of the converter valve in the system to the room of the complex building in which the underground coil is pre-buried during the heating season, and the underground coil dissipates the heat in the room through radiant heating.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] In the present invention, the opening and closing of No. 1 electric gate valve, No. 2 electric gate valve and electric three-way valve are controlled to change the direction of the internal cooling water flow in the main circulation loop, and heat exchange is performed with different terminals, thereby effectively utilizing the waste heat of the converter valve in different seasons and reducing energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the system structure of an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the main circulation loop structure of an embodiment of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the absorption refrigeration system of the present invention. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention are described in detail below.

[0027] The "range" disclosed in the present invention is defined in the form of a lower limit and an upper limit, and a given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of the particular range. The range defined in this way can be inclusive or exclusive of the end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a range. For example, if a range of 10 to 50 is listed for a specific parameter, it is understood that the range of 10 to 40 and 20 to 50 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following ranges can all be expected: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4 and 2 to 5. In this application, unless otherwise specified, the range of values ​​"a to b" represents an abbreviation of any real number combination between a and b, where a and b are both real numbers. For example, the range of values ​​"0 to 5" means that all real numbers between "0 to 5" have been fully listed in this article, and "0 to 5" is only an abbreviation of these numerical combinations.

[0028] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0029] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0030] If there is no special explanation, all steps of the present application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), which means that step (c) may be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0031] If there is no special explanation, the "include" and "comprising" mentioned in this application are open-ended or closed-ended. For example, the "include" and "comprising" may mean that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0032] Unless otherwise specified, the reaction is carried out at room temperature and pressure.

[0033] Unless otherwise specified, all parts or percentages are by weight.

[0034] In the present invention, all substances used are known substances and can be purchased or synthesized by known methods.

[0035] In the present invention, the devices or equipment used are all conventional devices or equipment known in the art and are commercially available.

[0036] The following is a further description of a specific implementation of a cold and heat source cogeneration system based on cascade utilization of converter valve waste heat according to the present invention in conjunction with an embodiment. The cold and heat source cogeneration system based on cascade utilization of converter valve waste heat according to the present invention is not limited to the description of the following embodiment.

[0037] Example:

[0038] A combined heat and cold source system based on cascade utilization of waste heat from converter valves, such as Figure 1-2As shown, it includes a filter E-4, a converter valve E-1, a degassing tank E-2, a main circulation water pump E-3, a No. 1 electric gate valve V-1, a No. 2 electric gate valve V-2, and an electric three-way valve V-3 which are connected in sequence. The two ends of the electric three-way valve V-3 are connected in series with the absorption refrigeration system and the spray water system through an electric regulating valve V-10 and a first non-return valve V-11 respectively. The two ends of the No. 1 electric gate valve V-1 are connected to an air cooling system, the two ends of the No. 2 electric gate valve V-2 are connected to a radiant heating system, and the two ends of the converter valve E-1 are connected to an auxiliary circulation loop. The air cooling system and the spray water system are used to reduce the internal cooling water temperature of the main circulation loop. The auxiliary circulation loop is used to supplement the main circulation loop with water, stabilize the water pressure, etc. The radiant heating system is used to recover the heat of the main circulation loop and perform radiant heating on rooms such as the comprehensive building.

[0039] By adopting the above technical means:

[0040] Make full use of the waste heat generated by the converter valve to reduce energy waste, heat outdoor pipes and equipment that need heating in winter, prevent the cold water temperature inside the pipes or equipment from falling below 0°C due to low ambient temperature, causing pipe freezing and cracking, provide radiation heating for rooms that need heating in winter, and use absorption refrigeration systems to cool rooms that need cooling, such as complex buildings.

[0041] In a possible embodiment, a degassing tank E-2 is provided at the outlet end of the converter valve E-1 and the inlet end of the main circulation water pump E-3 in the main circulation loop, and an electric gate valve No. 1 V-1, an electric gate valve No. 2 V-2, an electric three-way valve V-3, an electric regulating valve V-10, a first check valve V-11, and a filter E-4 are provided at the inlet end of the converter valve E-1 and the outlet end of the main circulation water pump E-3. Two main circulation pumps E-3 are provided, one for use and one for backup, for providing power to the system. The degassing tank E-2 is used to stabilize the water pressure in the pipeline. The electric gate valve No. 1 V-1, the electric gate valve No. 2 V-2, and the electric three-way valve V-3 are used to change the water flow direction inside the system. The electric regulating valve V-10 is used to adjust the amount of internal cooling water. The first check valve V-11 is used to prevent the water flow in the pipeline from backflowing, and the filter E-4 is used to treat impurities in the water.

[0042] In a possible implementation, electric gate valve No. 1 V-1 and electric gate valve No. 2 V-2 are provided on the main circulation loop, electric butterfly valve No. 1 V-4 is provided on the main circuit of the air cooling system, electric butterfly valve No. 2 V-12 is provided on the main circuit of the spray water system, valve V-7 is provided on one side of the plate heat exchanger E-12 of the radiant heating system, electric gate valve No. 1 V-1, electric gate valve No. 2 V-2, electric butterfly valve No. 1 V-4, electric butterfly valve No. 2 V-12, and electric butterfly valve No. 3 V-7 are all electric butterfly valves, which are convenient for inspection and maintenance of the pipelines.

[0043] like Figure 1 and2 As shown, the internal cooling water temperature of the main circulation loop of the heat exchange valve is 40-45°C. In order to prevent the water temperature inside the outdoor pipes and equipment from being lower than 0°C in winter, close the No. 1 electric gate valve V-1 to allow the internal cooling water flow in the main circulation loop to enter the air cooling system. The air-cooled heat exchanger E-11 is used to increase the outdoor air temperature and transfer it to the outdoor pipes and equipment through the heat transfer pipe for preheating. At this time, after heat exchange, the internal cooling water temperature can be reduced to 35-40°C.

[0044] like Figure 1 and 2 As shown, in order to make full use of the waste heat of the converter valve, the No. 2 electric gate valve V-2 is closed in winter, the electric three-way valve V-3 is connected to the filter E-4, and the cooling water in the converter valve with a temperature of 35-40°C is exchanged with the radiant heating system through the plate heat exchanger E-12, and the temperature is reduced to 25-30°C, and then returns to the main circulation loop. After the radiant heating system obtains the heat, it radiates heating to the rooms such as the comprehensive building through the underground coil S-1.

[0045] like Figure 1 and 2 As shown, the internal cooling water temperature of the main circulation loop of the heat exchange valve is 40-45°C. In order to make full use of the waste heat of the converter valve in summer, close the No. 1 electric butterfly valve V-4 and the No. 3 electric butterfly valve V-7, open the No. 1 electric gate valve V-1 and the No. 2 electric gate valve V-2, and connect the electric three-way valve V-3 to the plate heat exchanger E-18. The internal cooling water of the main circulation loop exchanges heat with the absorption refrigeration system through the plate heat exchanger E-18, and the temperature is reduced to 30-35°C. Then, it is cooled again to 20-25°C by the spray water system and returns to the main circulation loop. The absorption refrigeration system obtains heat and uses it to heat the working fluid pair in the generator E-19.

[0046] In a possible implementation, the absorption refrigeration system includes an absorbent cycle and a refrigerant cycle, the absorbent cycle is a positive cycle, and the refrigerant cycle is a reverse cycle, the positive cycle includes a generator E-19, an absorber E-20, a solution pump E-21, and a pressure reducing valve V-14, and the reverse cycle includes a condenser E-22, an evaporator E-23, and an expansion valve V-13;

[0047] One end of the generator E-19 is connected to the plate heat exchanger E-18, and the other end of the generator E-19 is connected to the absorber E-20. The generator E-19 is used to absorb the heat from the plate heat exchanger E-18, and heat the working fluid pair of the absorption refrigeration system, that is, the refrigerant-absorbent solution, to boil, wherein the refrigerant with a low boiling point is vaporized to form a high-pressure gaseous refrigerant. The absorber E-20 is used to release heat to the outside and absorb the low-pressure gaseous refrigerant with a liquid absorbent.

[0048] In a possible implementation, a solution pump E-21 and a pressure reducing valve V-14 are provided between the generator E-19 and the absorber E-20. The solution pump E-21 is used to pressurize the refrigerant-absorbent solution in a low-pressure state and then enter the generator E-19. The pressure reducing valve V-14 is used to reduce the pressure of the absorbent solution in a high-pressure state and then enter the absorber E-20.

[0049] Generator E-19 is connected to condenser E-22, absorber E-20 is connected to evaporator E-23, and expansion valve V-13 is provided between condenser E-22 and evaporator E-23. Condenser E-22 is used to release heat to the outside to liquefy the high-pressure gaseous refrigerant from generator E-19, expansion valve V-13 is used to reduce pressure and cool the refrigerant, and evaporator E-23 is used to absorb heat from the outside to vaporize the refrigerant into low-pressure steam.

[0050] In a possible implementation, the air cooling system includes an air cooling heat exchanger E-11, one end of the air cooling heat exchanger E-11 is provided with a No. 1 electric butterfly valve V-4 and a No. 1 temperature sensor T-1, and the other end of the air cooling heat exchanger E-11 is provided with a second one-way valve V-5, an electric regulating valve V-6, and a No. 2 temperature sensor T-2, the No. 1 electric butterfly valve V-4 is used for pipeline maintenance, the second one-way valve V-5 is used to prevent water flow in the pipeline from flowing back, the electric regulating valve V-6 is used to adjust the water volume in the pipeline, and the No. 1 temperature sensor T-1 and the No. 2 temperature sensor T-2 are used to monitor changes in water temperature in the pipeline;

[0051] The air-cooled heat exchanger E-11 is connected to the heat transfer pipeline and is used to transfer the heated outdoor air to the outdoor pipelines and equipment in winter to prevent the cold water temperature inside the pipelines or equipment from falling below 0°C due to the low ambient temperature, causing the pipelines to freeze and crack.

[0052] In a possible implementation, the spray water system is a non-closed circulating water system, which includes a spray tower E-24, a spray pump E-25, a buffer water tank, a dosing pump E-26, a water treatment tank, a No. 2 electric butterfly valve V-12, a No. 7 temperature sensor T-7, and a No. 8 temperature sensor T-8. The spray tower E-24 is equipped with a spray device and a variable frequency cooling fan. The spray device uses spray water to cool the internal cooling water from the valve hall. The variable frequency cooling fan is used to cool the process The generated steam is discharged. Two spray pumps E-25 are set, one for use and one for backup, to transport spray water to the spray tower E-24. The raw water is treated with chemicals in the water treatment tank to ensure that the water quality of the external cooling water meets the standards. Two make-up water pumps E-26 are set, one for use and one for backup. When the water level in the buffer water tank is low, the make-up water pump E-26 is turned on. The No. 2 electric butterfly valve V-12 is used to facilitate pipeline maintenance. The No. 7 temperature sensor T-7 and the No. 8 temperature sensor T-8 are used to monitor the water temperature.

[0053] In a possible implementation, a filter E-6 is provided at the outlet of the ion exchanger E-8 in the auxiliary circulation loop, and an expansion tank E-5 and a nitrogen tank E-6 are provided at the outlet of the filter E-6. The ion exchanger E-8 and the filter E-6 are used to treat impurities in part of the water in the main circulation loop, and the expansion tank E-5 and the nitrogen tank E-6 are used to buffer the water volume change in the main circulation loop, while isolating the air and maintaining a constant pressure.

[0054] A water replenishment pump E-9 and a water replenishment tank E-10 are set at the inlet bypass of the ion exchanger E-8. Two water replenishment pumps E-9 are set, one for use and one for backup, for replenishing the water in the water replenishment tank E-10 into the system.

[0055] In one possible embodiment, the radiant heating system includes a plate heat exchanger E-12, one end of which is provided with a No. 3 electric butterfly valve V-7, a third one-way valve V-8, an electric regulating valve V-9, a No. 3 temperature sensor T-3, and a No. 4 temperature sensor T-4, and the other end of the plate heat exchanger E-12 is provided with a heat recovery circulation pump E-14 and a filter E-13. The No. 3 electric butterfly valve V-7 is used to facilitate pipeline maintenance, the third one-way valve V-8 is used to prevent water flow back, the electric regulating valve V-9 is used to adjust the water volume in the pipeline, the temperature sensors T-3 and T-4 are used to monitor the water temperature changes in the pipeline, the heat recovery circulation pump E-14 is used to provide power for the radiant heating system, and the filter E-13 is used to remove impurities in the water in the radiant heating system.

[0056] In a possible implementation, a water replenishment circuit is provided between the plate heat exchanger E-12 and the heat recovery circulation pump E-14, and the water replenishment circuit includes a water replenishment tank E-15, a water replenishment pump E-16, and an expansion tank E-17. The water replenishment tank E-15 is used to replenish the water lost due to leakage of pipes, valves and other equipment during the operation of the radiant heating system. The water replenishment pump E-16 is used to provide power for the radiant heating system, and the expansion tank E-17 is used to store water.

[0057] In one possible implementation, the plate heat exchanger E-12 transfers the heat generated by the operation of the converter valve in the system to the room of the complex building where the underground coil S-1 is pre-buried during the heating season, and the underground coil S-1 dissipates the heat in the room through radiant heating.

[0058] In a possible implementation, the inlet and outlet ends of the air-cooled heat exchanger E-11 are respectively installed with temperature sensor No. 1 T-1 and temperature sensor No. 2 T-2, the inlet and outlet ends of the plate heat exchanger E-12 are respectively installed with temperature sensor No. 3 T-3 and temperature sensor No. 4 T-4, and the inlet and outlet ends of the plate heat exchanger E-18 are respectively installed with temperature sensor No. 5 T-5 and temperature sensor No. 6 T-6, which are used to detect the water temperature and ensure the ultimate cooling effect.

[0059] In a possible implementation, the material of the underground coil S-1 should be resistant to high temperature and pressure, have antioxidant properties, be corrosion-resistant and leak-proof, not easy to damage, and have a long service life. PE-X, PE-RT, PB and aluminum-plastic composite pipes can be considered. The radiant air-conditioning system only needs 30 to 35°C in winter, and low-quality heat energy at around 35°C is used for heating to improve the comfort of rooms such as complex buildings. In the radiant heating system, the low-temperature water from the rooms of the complex building absorbs the heat of the plate heat exchanger E-12 and the temperature rises. The heated hot water is driven by the heat recovery circulation pump E-14 into the underground coil S-1 in the room for comfortable heating of rooms such as the complex building.

[0060] In a possible implementation, Figure 1 As shown, the radiant heating system is equipped with a water supply tank E-15, a water supply pump E-16 and an expansion tank E-17 for water supply and pressure regulation. The water supply circuit includes a water supply tank E-15 located at the outlet of the underground coil S-1, a water supply pump E-16 located at the outlet of the water supply tank E-15 for adjusting the water flow, and an expansion tank E-17 for storing water. The water supply circuit can realize functions such as pressure stabilization, automatic water supply, automatic exhaust, automatic water discharge and automatic overpressure protection for the system.

[0061] In a possible implementation, Figure 1 and 2 As shown, the inlet and outlet of the spray water system are respectively installed with temperature sensor No. 7 T-7 and temperature sensor No. 8 T-8, which are used to monitor the water temperature to ensure the final cooling effect. The temperature of the water flowing back to the bridge arm of the converter valve is 20-25°C.

[0062] In a possible implementation, Figure 3 As shown, the temperature of the generator E-19 rises after absorbing the heat of the converter valve, so that the working fluid pair in the generator E-19 is heated, and the refrigerant with a low boiling point vaporizes to form a high-pressure gaseous refrigerant, thereby entering the condenser E-22, while the high-temperature and high-pressure absorbent becomes a low-pressure liquid after the throttling and pressure reduction effect of the expansion valve V-14. The high-pressure gaseous refrigerant releases heat to the cooling water in the condenser E-22 and is condensed into a liquid state. The temperature of the cooling water is reduced by the spraying effect in the cooling tower. The liquid refrigerant enters the evaporator E-23 after being reduced in pressure and cooled by the expansion valve V-13. After absorbing the heat of the chilled water in the evaporator E-23, it vaporizes into a low-pressure refrigerant vapor. The chilled water exchanges heat with the heat exchanger and transfers the cold to the user for refrigeration. The low-pressure refrigerant vapor enters the absorber E-20 and is absorbed by the low-temperature and low-pressure absorbent. The two are pressurized by the solution pump E-21 and sent to the generator E-19, and the cycle repeats over and over again.

[0063] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A cold and heat source cogeneration system based on cascade utilization of waste heat from converter valves, characterized in that: The invention comprises a filter (E-4), a flow changer valve (E-1), a degassing tank (E-2), a main circulation water pump (E-3), a No. 1 electric gate valve (V-1), a No. 2 electric gate valve (V-2), and an electric three-way valve (V-3) which are connected in sequence. Both ends of the electric three-way valve (V-3) are connected in series with an absorption refrigeration system and a spray water system through an electric regulating valve (V-10) and a first non-return valve (V-11), respectively. Both ends of the No. 1 electric gate valve (V-1) are connected to an air cooling system, both ends of the No. 2 electric gate valve (V-2) are connected to a radiation heating system, and both ends of the flow changer valve (E-1) are connected to an auxiliary circulation loop.

2. A cold and heat source cogeneration system based on cascade utilization of waste heat from converter valves according to claim 1, characterized in that: A degassing tank (E-2) is provided at the outlet end of the converter valve (E-1) and the inlet end of the main circulation water pump (E-3) in the main circulation loop; a No. 1 electric gate valve (V-1), a No. 2 electric gate valve (V-2), an electric three-way valve (V-3), an electric regulating valve (V-10), a first non-return valve (V-11), and a filter (E-4) are provided at the inlet end of the converter valve (E-1) and the outlet end of the main circulation water pump (E-3); two main circulation pumps (E-3) are provided, one for use and one for backup, for providing system power; the degassing tank (E-2) is used to stabilize the water pressure in the pipeline; the No. 1 electric gate valve (V-1), the No. 2 electric gate valve (V-2), and the electric three-way valve (V-3) are used to change the water flow direction inside the system; the electric regulating valve (V-10) is used to adjust the amount of internal cooling water; the first non-return valve (V-11) is used to prevent the water flow in the pipeline from backflowing; and the filter (E-4) is used to treat impurities in the water.

3. A cold and heat source cogeneration system based on cascade utilization of waste heat from converter valves as claimed in claim 1, characterized in that: The absorption refrigeration system includes an absorbent cycle and a refrigerant cycle, wherein the absorbent cycle is a positive cycle and the refrigerant cycle is a reverse cycle, wherein the positive cycle includes a generator (E-19), an absorber (E-20), a solution pump (E-21), and a pressure reducing valve (V-14), and the reverse cycle includes a condenser (E-22), an evaporator (E-23), and an expansion valve (V-13); One end of the generator (E-19) is connected to the plate heat exchanger (E-18), and the other end of the generator (E-19) is connected to the absorber (E-20). The generator (E-19) is used to absorb heat from the plate heat exchanger (E-18) to heat the working fluid pair of the absorption refrigeration system, i.e., the refrigerant-absorbent solution, to boil, wherein the refrigerant with a low boiling point is vaporized to form a high-pressure gaseous refrigerant. The absorber (E-20) is used to release heat to the outside and absorb the low-pressure gaseous refrigerant with a liquid absorbent.

4. A cold and heat source cogeneration system based on cascade utilization of waste heat from converter valves as claimed in claim 2, characterized in that: A solution pump (E-21) and a pressure reducing valve (V-14) are provided between the generator (E-19) and the absorber (E-20), wherein the solution pump (E-21) is used to pressurize the refrigerant-absorbent solution in a low-pressure state and allow it to enter the generator (E-19), and the pressure reducing valve (V-14) is used to reduce the pressure of the absorbent solution in a high-pressure state and allow it to enter the absorber (E-20); The generator (E-19) is connected to the condenser (E-22), the absorber (E-20) is connected to the evaporator (E-23), an expansion valve (V-13) is provided between the condenser (E-22) and the evaporator (E-23), the condenser (E-22) is used to release heat to the outside so as to liquefy the high-pressure gaseous refrigerant from the generator (E-19), the expansion valve (V-13) is used to reduce the pressure and temperature of the refrigerant, and the evaporator (E-23) is used to absorb heat from the outside so as to vaporize the refrigerant into low-pressure steam.

5. The cold and heat source combined supply system based on cascade utilization of waste heat from converter valves according to claim 1, characterized in that: The air cooling system comprises an air cooling heat exchanger (E-11), one end of the air cooling heat exchanger (E-11) is provided with a No. 1 electric butterfly valve (V-4) and a No. 1 temperature sensor (T-1), and the other end of the air cooling heat exchanger (E-11) is provided with a second one-way valve (V-5), an electric regulating valve (V-6), and a No. 2 temperature sensor (T-2), the No. 1 electric butterfly valve (V-4) is used for pipeline maintenance, the second one-way valve (V-5) is used to prevent water flow in the pipeline from flowing back, the electric regulating valve (V-6) is used to adjust the amount of water in the pipeline, and the No. 1 temperature sensor (T-1) and the No. 2 temperature sensor (T-2) are used to monitor changes in water temperature in the pipeline; The air-cooled heat exchanger (E-11) is connected to the heat transport pipeline and is used to transport the heated outdoor air to the outdoor pipeline and equipment in winter to prevent the cold water temperature inside the pipeline or equipment from falling below 0°C due to the low ambient temperature, causing the pipeline to freeze and crack.

6. A cold and heat source cogeneration system based on cascaded utilization of waste heat from converter valves according to claim 1, characterized in that: The spray water system is a non-closed circulating water system, which includes a spray tower (E-24), a spray pump (E-25), a buffer water tank, a dosing pump (E-26), a water treatment tank, a No. 2 electric butterfly valve (V-12), a No. 7 temperature sensor (T-7), and a No. 8 temperature sensor (T-8). The spray tower (E-24) is equipped with a spray device and a variable frequency cooling fan. The spray device uses spray water to cool the internal cooling water from the valve hall. The variable frequency cooling fan is used to discharge the steam generated in the process. Two spray pumps (E-25) are provided, one for use and one for backup, for conveying spray water to the spray tower (E-24). The raw water is treated with chemicals in the water treatment pool to ensure that the quality of the external cooling water meets the standards. Two water make-up pumps (E-26) are provided, one for use and one for backup. When the water level in the buffer pool is low, the water make-up pump (E-26) is turned on. The No. 2 electric butterfly valve (V-12) is used to facilitate pipeline maintenance. The No. 7 temperature sensor (T-7) and the No. 8 temperature sensor (T-8) are used to monitor the water temperature.

7. A cold and heat source cogeneration system based on cascaded utilization of waste heat from converter valves according to claim 1, characterized in that: The outlet end of the ion exchanger (E-8) in the auxiliary circulation loop is provided with a filter (E-6), and the outlet end of the filter (E-6) is provided with an expansion tank (E-5) and a nitrogen tank (E-6). The ion exchanger (E-8) and the filter (E-6) are used to treat impurities in part of the water in the main circulation loop, and the expansion tank (E-5) and the nitrogen tank (E-6) are used to buffer the water volume change in the main circulation loop, while isolating the air and maintaining a constant pressure; A water replenishment pump (E-9) and a water replenishment tank (E-10) are arranged at the inlet bypass of the ion exchanger (E-8). Two water replenishment pumps (E-9) are arranged, one for use and one for backup, for replenishing the water in the water replenishment tank (E-10) into the system.

8. The cold and heat source cogeneration system based on cascade utilization of waste heat from converter valves according to claim 1, characterized in that: The radiant heating system comprises a plate heat exchanger (E-12), one end of which is provided with a No. 3 electric butterfly valve (V-7), a third non-return valve (V-8), an electric regulating valve (V-9), a No. 3 temperature sensor (T-3), and a No. 4 temperature sensor (T-4), and the other end of the plate heat exchanger (E-12) is provided with a heat recovery circulation pump (E-14) and a filter (E-13), the No. 3 electric butterfly valve (V-7) is used to facilitate pipeline maintenance, the third non-return valve (V-8) is used to prevent water flow from flowing back, the electric regulating valve (V-9) is used to adjust the amount of water in the pipeline, the temperature sensors (T-3) and (T-4) are used to monitor changes in water temperature in the pipeline, the heat recovery circulation pump (E-14) is used to provide power for the radiant heating system, and the filter (E-13) is used to remove impurities in the water of the radiant heating system.

9. A cold and heat source cogeneration system based on cascaded utilization of converter valve waste heat as claimed in claim 8, characterized in that: A water replenishment circuit is provided between the plate heat exchanger (E-12) and the heat recovery circulation pump (E-14), and the water replenishment circuit includes a water replenishment tank (E-15), a water replenishment pump (E-16), and an expansion tank (E-17). The water replenishment tank (E-15) is used to replenish the water lost due to leakage of pipes, valves and other equipment during the operation of the radiant heating system. The water replenishment pump (E-16) is used to provide power to the radiant heating system. The expansion tank (E-17) is used to store water.

10. A cold and heat source cogeneration system based on cascaded utilization of converter valve waste heat according to claim 9, characterized in that: During the heating season, the plate heat exchanger (E-12) transfers the heat generated by the operation of the converter valve in the system to the room of the complex building where the underground coil (S-1) is pre-buried, and the underground coil (S-1) dissipates the heat in the room through radiant heating.

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