Comprehensive utilization system for refrigerating and heating by recovering waste heat of air compressor

Abstract

The utility model relates to an air compressor waste heat recovery refrigeration and heating comprehensive utilization system which comprises an air compressor, an oil-water heat exchanger, a circulating water pump, a circulating water tank, a heat preservation energy storage water tank and a stop valve. The circulating water tank is connected with a circulating water heat exchange inlet and outlet of the oil-water heat exchanger through a circulating water heat exchange pipeline, a hot water outlet of the circulating water tank is connected with the heat-preservation energy-storage water tank through a heat-preservation pipeline, a heat transfer outlet of the heat-preservation energy-storage water tank is connected with two pipelines, one pipeline is connected with factory refrigeration, and the other pipeline is connected with factory heating; the utility model has the beneficial effects that the combined arrangement of the refrigeration station and the air compression station can reduce the use amount of pipes, respectively realize the double-effect utilization of refrigeration and heat supply in the factory in summer and winter, reduce the waste of circulating cooling water by the air compression station while reducing the heat loss, fully recycle the energy, and achieve the energy efficiency.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology of air compressors, and in particular to a comprehensive utilization system for refrigeration and heating based on waste heat recovery from air compressors. Background Technology

[0002] In the coking industry, air compressor stations play an indispensable role as the air source for plant production. Most air compressor stations typically use centrifugal or screw compressors. Due to the different air compression processes of these two types of compressors, the outlet temperature of the compressed air produced also differs. To ensure cooling effectiveness and normal operation of the air compressor, each stage of the compressor's cooler consumes a large amount of circulating cooling water produced by the cooling tower. This results in a significant demand for cooling water while wasting a considerable amount of high-grade heat energy released by the coolers, leading to water and heat energy waste and reduced energy efficiency.

[0003] Currently, the low-pressure steam generated during the cooling process in many plants is insufficient to meet production needs. Furthermore, the old process routes are complex to operate, and the low-pressure steam consumes a huge amount of energy during operation. This not only wastes the operating costs for the owners but also violates the requirements of green coking for extreme energy efficiency, making coking production neither economical nor practical. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model provides a comprehensive utilization system for air compressor waste heat recovery for refrigeration and heating. By optimizing the internal and external piping systems of the air compressor and installing an external oil-water heat exchanger, the high-grade heat energy from the original cooling units at each stage is transferred to the hot water chiller and the plant's heating network for refrigeration and heating through a circulating water tank. This achieves dual-effect utilization of cooling and heating in the plant during both summer and winter. This reduces investment in plant buildings and equipment, alleviates the current situation of insufficient steam supply in the plant, reduces the large-scale use of circulating water, and realizes comprehensive energy utilization in a cascade manner.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A comprehensive utilization system for air compressor waste heat recovery for refrigeration and heating includes an air compressor, an oil-water heat exchanger, a circulating water pump, a circulating water tank, an insulated energy storage tank, and shut-off valves. The air compressor is connected to the oil heat exchange inlet and outlet of the oil-water heat exchanger via an oil heat exchange pipeline. The circulating water tank is connected to the circulating water heat exchange inlet and outlet of the oil-water heat exchanger via a circulating water heat exchange pipeline. The hot water outlet of the circulating water tank is connected to the insulated energy storage tank via an insulated pipeline. Circulating water pumps are installed on both the insulated pipeline and the circulating water heat exchange pipeline. A liquid level monitoring device is installed in the circulating water tank. The liquid level monitoring device and the two circulating water pumps are interlocked. The heat transfer outlet of the insulated energy storage tank is connected to two pipelines: one pipeline connects to the plant's refrigeration system, and the other pipeline connects to the plant's heating system. Shut-off valves are installed on each of the two pipelines.

[0007] The plant refrigeration system includes a chiller, a cooling tower, and a regulating valve. The hot water inlet of the chiller is connected to an insulated energy storage tank, and the hot water outlet of the chiller is connected to a circulating water tank via a return water pipe. A regulating valve is installed on the return water pipe. The cooling tower is connected to the cooling water inlet and outlet of the chiller via a cooling water pipeline. The low-temperature return water inlet and low-temperature supply water inlet of the chiller are connected to the plant refrigeration circulation system.

[0008] Furthermore, the oil heat exchange pipeline includes a high-temperature oil pipe and a low-temperature oil pipe. The high-temperature oil pipe connects the high-temperature oil outlet of the air compressor to the oil heat exchange inlet of the oil-water heat exchanger, and the low-temperature oil pipe connects the low-temperature oil inlet of the air compressor to the oil heat exchange outlet of the oil-water heat exchanger.

[0009] Furthermore, the circulating water heat exchange pipeline includes a circulating water inlet pipe and a circulating water return pipe. The circulating water inlet pipe connects the circulating water outlet of the oil-water heat exchanger and the circulating water inlet of the circulating water tank. The circulating water return pipe connects the circulating water inlet of the oil-water heat exchanger and the circulating water outlet of the circulating water tank.

[0010] Furthermore, the cooling water pipeline includes a cooling water supply pipeline and a cooling water return pipeline. The cooling water supply pipeline connects the cooling tower inlet and the chiller cooling water inlet, and the cooling water return pipeline connects the cooling tower return outlet and the chiller cooling water outlet.

[0011] Furthermore, the circulating water tank is equipped with industrial water replenishment to periodically replenish the system.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. Combining the refrigeration station and the air compressor station can reduce the amount of piping used, as well as reduce the loss of temperature drop and pressure drop. It also eliminates the need for the refrigeration unit to use the waste hot water from the primary cooler, thereby reducing the investment in plant and equipment and saving costs.

[0014] 2. By using an external heat exchanger, the high-grade heat energy of the cooler is extracted and transferred to the hot water chiller and the plant heating network, so as to achieve dual-effect utilization of cooling and heating in the plant during summer and winter. This reduces heat loss and reduces the waste of circulating cooling water in the air compressor station, saves energy, and improves the energy recovery and utilization rate.

[0015] 3. In summer, the hot water produced by the air compressor heat exchange can be used as energy for the chiller to supply cooling to the plant area, improving energy utilization. The hot water after use is returned to the circulating water tank for heat exchange and circulation again, reducing the large amount of circulating water used, avoiding water waste, realizing a fully closed loop, improving heat exchange efficiency, and realizing the comprehensive utilization of energy in a cascade manner.

[0016] 4. Hot water can be used directly for heating in winter, which helps to alleviate the current situation of large-scale heating shortage in some areas, and can also alleviate the current situation of insufficient steam supply in the plant area, making full use of energy, realizing green coking, and achieving ultimate energy efficiency. Attached Figure Description

[0017] Figure 1 This is a system layout diagram of a comprehensive utilization system for air compressor waste heat recovery, refrigeration, and heating, as described in this utility model.

[0018] In the diagram: 1. Air compressor; 2. Oil-water heat exchanger; 3. Circulating water pump; 4. Circulating water tank; 5. Insulated energy storage tank; 6. Regulating valve; 7. Shut-off valve; 8. Refrigeration unit; 9. Cooling tower; 10. Oil heat exchange pipeline; 11. Circulating water heat exchange pipeline; 12. Insulated pipeline; 13. Return water pipeline; 14. Cooling water pipeline; 15. High-temperature oil pipeline; 16. Low-temperature oil pipeline; 17. Circulating water inlet pipeline; 18. Circulating water return pipeline; 19. Cooling water supply pipeline; 20. Cooling water return pipeline; LG. Liquid level monitoring device. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0020] like Figure 1As shown, a comprehensive utilization system for air compressor waste heat recovery for refrigeration and heating includes an air compressor 1, an oil-water heat exchanger 2, a circulating water pump 3, a circulating water tank 4, an insulated energy storage tank 5, and a shut-off valve 7. The air compressor 1 is connected to the oil heat exchange inlet and outlet of the oil-water heat exchanger 2 via an oil heat exchange pipeline 10. The circulating water tank 4 is connected to the circulating water heat exchange inlet and outlet of the oil-water heat exchanger 2 via a circulating water heat exchange pipeline 11. The 76°C high-temperature oil generated by the oil cooler of the air compressor 1 enters the oil-water heat exchanger 2 through the oil heat exchange pipeline 10. In the oil-water heat exchanger 2, the 50°C circulating water in the circulating water tank 4 enters the oil-water heat exchanger 2 through the circulating water heat exchange pipe 11. The 76°C high-temperature oil and the 50°C circulating water exchange heat in the oil-water heat exchanger 2. The 76°C high-temperature oil cools down to a low-temperature oil of 73°C, while the 50°C circulating water heats up to hot water of 60°C. The 73°C low-temperature oil after heat exchange in the oil-water heat exchanger 2 is sent back to the air compressor 1 through the low-temperature oil pipe 16. The 60°C hot water returns to the circulating water tank 4. The hot water outlet of the circulating water tank 4 is connected to the insulated pipe 1. 2. Connect the insulated energy storage water tank 5. After heat exchange, the 60°C hot water in the circulating water tank 4 flows from the circulating water tank 4 into the insulated energy storage water tank 5 through the insulated pipe 12. Circulating water pumps 3 are installed on both the insulated pipe 12 and the circulating water heat exchange pipe 11. A liquid level monitoring device LG is installed in the circulating water tank 4. The liquid level monitoring device LG and the two circulating water pumps 3 are interlocked. When the water level is lower than the set value, the speed of the circulating water pumps 3 between the circulating water tank 4 and the insulated energy storage water tank 5 is reduced, and the oil-water flow rate is increased. The speed of the circulating water pump 3 between heat exchanger 2 and circulating water tank 4 is increased to raise the water level of circulating water tank 4; when the water level is higher than the set value, the speed of the circulating water pump 3 between circulating water tank 4 and heat-insulated energy storage tank 5 is increased, and the speed of the circulating water pump 3 between circulating water tank 4 and oil-water heat exchanger 2 is decreased to lower the water level of circulating water tank 4. The heat transmission outlet of the heat-insulated energy storage tank 5 is connected to two pipelines, one pipeline is connected to the plant cooling system, and the other pipeline is connected to the plant heating system. The two pipelines are respectively equipped with shut-off valves 7.

[0021] The plant cooling system includes a chiller 8, a cooling tower 9, and a regulating valve 6. When cooling is required, the shut-off valve 7 between the chiller 8 and the insulated energy storage tank 5 opens, while the shut-off valve 7 for heating closes. Hot water from the insulated energy storage tank 5 enters the chiller 8. The regulating valve 6, installed between the chiller 8 and the circulating water tank 4, can adjust the flow rate of hot water into and out of the chiller 8 according to its load capacity. The hot water supplied by the insulated energy storage tank 5 serves as the heat source for the chiller 8, and the 35°C circulating cooling water generated in the cooling tower 9 supplies water to the plant cooling system. The 23°C low-temperature water returning from the intermediate circulation is cooled and refrigerated to produce 16°C low-temperature water, which is supplied to the plant's refrigeration circulation system for refrigeration. The hot water that powers the chiller 8 flows back to the circulating water tank 4 through the return water pipe 13 and regulating valve 6. The 43°C circulating cooling water that has been heated by heat exchange returns to the cooling tower 9 for further cooling, completing the closed-loop heat exchange process. When heating is needed, the shut-off valve 7 between the chiller 8 and the insulated energy storage tank 5 is closed, and the shut-off valve 7 for heating is opened, using the hot water in the insulated energy storage tank 5 to supply heat to the plant's heating network.

[0022] Furthermore, the oil heat exchange pipeline 10 includes a high-temperature oil pipe 15 and a low-temperature oil pipe 16. The high-temperature oil pipe 15 is connected to the high-temperature oil outlet of the air compressor 1 and the oil heat exchange inlet of the oil-water heat exchanger 2, and the low-temperature oil pipe 16 is connected to the low-temperature oil inlet of the air compressor 1 and the oil heat exchange outlet of the oil-water heat exchanger 2.

[0023] Furthermore, the circulating water heat exchange pipeline 11 includes a circulating water inlet pipe 17 and a circulating water return pipe 18. The circulating water inlet pipe 17 connects the circulating water outlet of the oil-water heat exchanger 2 and the circulating water inlet of the circulating water tank 4, and the circulating water return pipe 18 connects the circulating water inlet of the oil-water heat exchanger 2 and the circulating water outlet of the circulating water tank 4.

[0024] Furthermore, the cooling water pipe 14 includes a cooling water supply pipe 19 and a cooling water return pipe 20. The cooling water supply pipe 19 is connected to the water inlet of the cooling tower 9 and the cooling water inlet of the chiller 8, and the cooling water return pipe is connected to the water outlet of the cooling tower 9 and the cooling water outlet of the chiller 8.

[0025] Furthermore, the circulating water tank 4 is equipped with industrial water replenishment, which periodically replenishes the system with 20°C industrial water to offset the circulating water loss during the system circulation process.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An air compressor waste heat recovery refrigeration and heating comprehensive utilization system, comprising an air compressor, an oil-water heat exchanger, a circulating water pump, a circulating water tank, a heat preservation energy storage water tank and a cut-off valve, characterized in that, The air compressor is connected with the oil heat exchange inlet and outlet of the oil-water heat exchanger through an oil heat exchange pipeline, the circulating water tank is connected with the circulating water heat exchange inlet and outlet of the oil-water heat exchanger through a circulating water heat exchange pipeline, the hot water outlet of the circulating water tank is connected with the heat storage water tank through a heat preservation pipeline, the heat preservation pipeline and the circulating water heat exchange pipeline are provided with a circulating water pump, the circulating water tank is provided with a liquid level monitoring device, the liquid level monitoring device and the two circulating water pumps are interlocked controlled, the heat outlet of the heat storage water tank is connected with two pipelines, one pipeline is connected with the plant refrigeration, and the other pipeline is connected with the plant heating, and the two pipelines are respectively provided with a cut-off valve. The plant refrigeration comprises a refrigeration machine, a cooling tower and a regulating valve, the hot water inlet of the refrigeration machine is connected with the heat storage water tank, the hot water outlet of the refrigeration machine is connected with the circulating water tank through a backwater pipeline, and the backwater pipeline is provided with the regulating valve; the cooling tower is connected with the cooling water inlet and outlet of the refrigeration machine through a cooling water pipeline; and the low-temperature backwater outlet and the low-temperature water supply outlet of the refrigeration machine are connected with the plant refrigeration circulating system.

2. The comprehensive utilization system of air compressor waste heat recovery refrigeration and heating according to claim 1, characterized in that, The oil heat exchange pipeline comprises a high-temperature oil pipeline and a low-temperature oil pipeline, the high-temperature oil pipeline is connected with the high-temperature oil outlet of the air compressor and the oil heat exchange inlet of the oil-water heat exchanger, and the low-temperature oil pipeline is connected with the low-temperature oil inlet of the air compressor and the oil heat exchange outlet of the oil-water heat exchanger.

3. The comprehensive utilization system of air compressor waste heat recovery refrigeration and heating according to claim 1, characterized in that, The circulating water heat exchange pipeline comprises a circulating water inlet pipeline and a circulating water backwater pipeline, the circulating water inlet pipeline is connected with the circulating water outlet of the oil-water heat exchanger and the circulating water inlet of the circulating water tank, and the circulating water backwater pipeline is connected with the circulating water inlet of the oil-water heat exchanger and the circulating water outlet of the circulating water tank.

4. The comprehensive utilization system of air compressor waste heat recovery refrigeration and heating according to claim 1, characterized in that, The cooling water pipeline comprises a cooling water feed pipeline and a cooling water backwater pipeline, the cooling water feed pipeline is connected with the cooling tower water supply inlet and the refrigeration machine cooling water inlet, and the cooling water backwater pipeline is connected with the cooling tower backwater outlet and the refrigeration machine cooling water outlet.

5. The air compressor waste heat recovery refrigeration and heating comprehensive utilization system according to claim 1, characterized in that, The circulating water tank is provided with industrial water supplement, and the system is supplemented with water regularly.

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