Efficient water medium type waste heat recovery refrigeration cooling system of air compressor

Abstract

The utility model discloses an efficient water medium type waste heat recovery refrigeration cooling system of an air compressor, which is characterized in that a first-stage compressor, a gas flow channel of a first-stage heat exchanger, a second-stage compressor, a gas flow channel of a second-stage heat exchanger, a third-stage compressor and a gas flow channel of a third-stage heat exchanger are communicated in sequence; an inlet and an outlet of a chilled water flow channel of the water-water heat exchanger communicate with a chilled water outlet and a chilled water inlet of the lithium bromide refrigerating unit correspondingly, and an inlet of a cooling water flow channel of the water-water heat exchanger communicates with a water outlet of the first cooling tower. Inlets of the water flow channels of the first-stage heat exchanger and the second-stage heat exchanger are respectively communicated with an outlet of a cooling water flow channel of the water-water heat exchanger or / and a water outlet of the first cooling tower; and a water flow channel of the third-stage heat exchanger and a heating medium water flow channel of the lithium bromide refrigerating unit form a loop. Medium-temperature chilled water is generated by recycling high-temperature waste heat of the air compressor for refrigeration and can be directly used for cooling the air compressor, and energy is utilized more sufficiently.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a high-efficiency water-medium waste heat recovery refrigeration and temperature reduction system for an air compressor. Background Art

[0002] Compressed gas is one of the commonly used power sources in the industrial field. A large amount of energy is consumed in the preparation process. When the compressor is running, it will convert electrical energy into heat in the compressed gas and discharge it into the air through air cooling or water cooling. The waste heat of the compressed gas cannot be utilized, resulting in waste and also affecting the environment. In industrial production, medium-temperature chilled water is often required. Generally, new refrigeration equipment will be added to produce the required chilled water. If the waste heat of the compressed gas can be used for the preparation of medium-temperature chilled water, energy can be more fully utilized and costs can be reduced. Therefore, the utility model proposes an air compressor high-efficiency water-based waste heat recovery refrigeration and cooling system. Utility Model Content

[0003] In order to address the deficiencies in the prior art, the utility model provides an air compressor high-efficiency water-based waste heat recovery refrigeration and cooling system, which recovers the high-temperature waste heat of the air compressor for refrigeration to generate medium-temperature chilled water that can be directly used for cooling the air compressor or for cooling process equipment in the production line; and can greatly reduce the electric power of the lithium bromide refrigeration unit equipment, while ensuring the efficient operation of the air compressor and providing sufficient cooling capacity for the cooling of the production line process equipment; effectively solves the problem of production-type enterprises requiring medium-temperature cooling water for production line equipment, and no new refrigeration equipment is required, and medium-temperature cooling water can be produced using the existing centrifugal air compressor; efficient use of the high-temperature waste heat of the centrifugal air compressor for refrigeration can meet its own cooling needs, and can also meet the cooling needs of the production equipment; the system makes more effective use of energy, and realizes the conversion of thermal energy into cooling capacity using a small amount of electrical energy.

[0004] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical solutions:

[0005] An air compressor high-efficiency water-medium waste heat recovery refrigeration and temperature-lowering system comprises an air compressor, a lithium bromide refrigeration unit, a first cooling tower, a primary heat exchanger, a secondary heat exchanger, a tertiary heat exchanger, and a water-to-water heat exchanger. The air compressor comprises a primary compressor, a secondary compressor, and a tertiary compressor. The primary heat exchanger, the secondary heat exchanger, and the tertiary heat exchanger are provided with gas flow channels and water flow channels; the water-to-water heat exchanger is provided with a chilled water flow channel and a cooling water flow channel.

[0006] The gas flow passage of the first-stage compressor and the first-stage heat exchanger, the gas flow passage of the second-stage compressor and the second-stage heat exchanger, the gas flow passage of the third-stage compressor and the third-stage heat exchanger are connected in sequence;

[0007] The inlet and outlet of the chilled water flow channel of the water-to-water heat exchanger are respectively connected to the chilled water outlet and chilled water inlet of the lithium bromide refrigeration unit, and the inlet of the cooling water flow channel of the water-to-water heat exchanger is connected to the outlet of the first cooling tower;

[0008] The inlets of the water channels of the primary heat exchanger and the secondary heat exchanger are respectively connected to the outlets of the cooling water channels of the water-to-water heat exchanger or / and the water outlet of the first cooling tower; the outlets of the water channels of the primary heat exchanger and the secondary heat exchanger are respectively connected to the water inlet of the first cooling tower;

[0009] The water flow channel of the three-stage heat exchanger and the heat medium water flow channel of the lithium bromide refrigeration unit form a loop.

[0010] The cooling water of the first cooling tower is also used as the cooling medium of the lithium bromide refrigeration unit.

[0011] The system also includes a second cooling tower, and cooling water of the second cooling tower is used as a cooling medium for the lithium bromide refrigeration unit.

[0012] The lithium bromide refrigeration unit comprises a condenser, an evaporator and a heat exchanger which are connected in sequence. The cooling water of the first cooling tower and / or the cooling water of the second cooling tower are used as the cooling medium of the condenser. The heat medium water flow channel of the lithium bromide refrigeration unit is located in the heat exchanger.

[0013] The air compressor is a centrifugal air compressor.

[0014] Two sets of independent water pumps are respectively arranged on the water outlet pipelines of the first cooling tower, the second cooling tower and the lithium bromide refrigeration unit.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The utility model recovers the high-temperature waste heat of the air compressor to generate medium-temperature chilled water, which can be directly used to cool the air compressor or to cool the process equipment of the production line.

[0017] 2. The utility model can greatly reduce the electric power of lithium bromide refrigeration unit equipment, while ensuring the efficient operation of the air compressor and providing sufficient cooling capacity for the cooling of production line process equipment.

[0018] 3. This system effectively solves the problem of production-oriented enterprises' production line equipment requiring medium-temperature cooling water, and there is no need to add new refrigeration equipment. The existing centrifugal air compressor can produce medium-temperature cooling water; the efficient use of high-temperature waste heat from the centrifugal air compressor can meet its own cooling needs, and can also meet the cooling needs of production equipment; this system makes more effective use of energy, realizing the conversion of heat energy into cooling using a small amount of electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] AttachedFigure 1 It is a flow chart of the utility model.

[0020] Attached Figure 2 It is a flow chart of the lithium bromide refrigeration unit of the utility model.

[0021] The numbers shown in the accompanying drawings are: 1. air compressor; 11. primary compressor; 12. secondary compressor; 13. tertiary compressor; 2. lithium bromide refrigeration unit; 21. condenser; 22. evaporator; 23. heat exchanger; 24. heat medium water flow channel; 3. first cooling tower; 4. primary heat exchanger; 5. secondary heat exchanger; 6. tertiary heat exchanger; 7. water-to-water heat exchanger; 8. second cooling tower. DETAILED DESCRIPTION

[0022] The utility model is further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the utility model and are not used to limit the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the present application.

[0023] like Figure 1 As shown, the utility model provides an air compressor 1 high-efficiency water-based waste heat recovery refrigeration and cooling system, comprising an air compressor 1, a lithium bromide refrigeration unit 2, a first cooling tower 3, a primary heat exchanger 4, a secondary heat exchanger 5, a tertiary heat exchanger 6, and a water-to-water heat exchanger 7. The air compressor 1 comprises a primary compressor 11, a secondary compressor 12, and a tertiary compressor 13. The primary heat exchanger 4, the secondary heat exchanger 5, and the tertiary heat exchanger 6 all have gas flow channels for compressed air circulation and water flow channels for cooling water circulation; the water-to-water heat exchanger 7 has a chilled water flow channel for chilled water circulation and a cooling water flow channel for cooling water circulation.

[0024] The primary compressor 11, the gas flow passage of the primary heat exchanger 4, the secondary compressor 12, the gas flow passage of the secondary heat exchanger 5, the tertiary compressor 13, and the gas flow passage of the tertiary heat exchanger 6 are sequentially connected through compressed air pipelines. Specifically, the compressed air outlet of the primary compressor 11 is connected to the inlet of the gas flow passage of the primary heat exchanger 4, the outlet of the gas flow passage of the primary heat exchanger 4 is connected to the compressed air inlet of the secondary compressor 12, the compressed air outlet of the secondary compressor 12 is connected to the inlet of the gas flow passage of the secondary heat exchanger 5, the gas flow passage outlet of the secondary heat exchanger 5 is connected to the compressed air inlet of the tertiary compressor 13, the compressed air outlet of the tertiary compressor 13 is connected to the inlet of the gas flow passage of the tertiary heat exchanger 6, and the compressed air flowing out of the outlet of the gas flow passage of the tertiary heat exchanger 6 can be used.

[0025] The inlet and outlet of the chilled water flow channel of the water-to-water heat exchanger 7 are respectively connected to the chilled water outlet and the chilled water inlet of the lithium bromide refrigeration unit 2, and the inlet of the cooling water flow channel of the water-to-water heat exchanger 7 is connected to the outlet of the first cooling tower 3. The chilled water at about 10°C flowing out of the lithium bromide refrigeration unit 2 exchanges heat with the cooling water in the cooling water flow channel of the water-to-water heat exchanger 7, so that the medium-temperature chilled water at about 16°C flows out of the cooling water flow channel of the water-to-water heat exchanger 7, which is used for the primary heat exchanger and / or the secondary heat exchanger to cool the compressed air.

[0026] The inlet of the water channel of the primary heat exchanger 4 is connected to the outlet of the cooling water channel of the water-to-water heat exchanger 7 or / and the water outlet of the first cooling tower 3; the outlet of the water channel of the primary heat exchanger 4 is connected to the water inlet of the first cooling tower 3.

[0027] The water channel inlet of the secondary heat exchanger 5 is connected to the outlet of the cooling water channel of the water-to-water heat exchanger 7 or / and the water outlet of the first cooling tower 3 ; the water channel outlet of the secondary heat exchanger 5 is connected to the water inlet of the first cooling tower 3 .

[0028] The water flow channel of the three-stage heat exchanger 6 and the heat medium water flow channel of the lithium bromide refrigeration unit 2 form a loop.

[0029] The working process of the compressor of this system:

[0030] Attach Figure 1 The temperature and flow rate of each substance in the air compressor are taken as an example for specific description. Air at room temperature enters the first-stage compressor 11 from the compressed air inlet of the first-stage compressor 11, and the temperature rises to about 110°C after the action of the first-stage compressor 11; the high-temperature first-stage compressed air enters the first-stage heat exchanger 4 for heat exchange, and the temperature drops to about 17.15°C after the action of chilled water or / and cooling water; then enters the second-stage compressor 12 from the compressed air inlet of the second-stage compressor 12, and the temperature rises to about 110°C after the action of the second-stage compressor 12; the high-temperature second-stage compressed air enters the second-stage heat exchanger 5 for heat exchange, and the temperature of the second-stage compressed air drops to about 30°C after the action of cooling water; then enters the third-stage compressor 13 from the compressed air inlet of the third-stage compressor 13, and the temperature rises to about 110°C after the action of the third-stage compressor 13; the high-temperature third-stage compressed air is heat exchanged through the third-stage heat exchanger 6, so that the temperature of the third-stage compressed air drops to about 82°C for subsequent use.

[0031] The water flow passages of the primary heat exchanger 4 and the secondary heat exchanger 5 of the utility model can be fed with cooling water alone, or chilled water alone, or mixed water of chilled water at about 16°C and cooling water at about 20°C, so that the temperature of the primary compressed air can be reduced to about 17.15°C. The water flow passage of the secondary heat exchanger 5 is fed with cooling water at about 20°C, so that the temperature of the secondary compressed air can be reduced to about 30°C. The water flow passage of the secondary heat exchanger 5 is fed with heat medium return water at about 65°C, so that the temperature of the tertiary compressed air can be reduced to about 82°C.

[0032] The chilled water generated by the lithium bromide refrigeration unit 2 enters the chilled water flow channel of the water-to-water heat exchanger 7, and performs heat exchange on the water entering the cooling water flow channel of the water-to-water heat exchanger 7 from the first cooling tower 3, so that the temperature of the water flowing out of the cooling water flow channel of the water-to-water heat exchanger 7 drops to about 16°C, so as to be used for heat exchange in the primary heat exchanger 4 and / or the secondary heat exchanger 5, or for cooling process equipment.

[0033] The heat medium water flow channel 24 of the lithium bromide refrigeration unit 2 forms a loop with the water flow channel of the tertiary heat exchanger 6. The water temperature increases after heat exchange in the tertiary heat exchanger 6 and flows to the heat medium water flow channel 24 of the lithium bromide refrigeration unit 2, which can be used as a heat source for the lithium bromide refrigeration unit 2. After the temperature decreases (about 65°C), it flows out to the tertiary heat exchanger 6 for heat exchange, so that the temperature increases, thereby forming a cycle.

[0034] Furthermore, the cooling water of the first cooling tower 3 is also used as the cooling medium of the lithium bromide refrigeration unit 2 .

[0035] Furthermore, the system also includes a second cooling tower 8 , and cooling water of the second cooling tower 8 is used as a cooling medium for the lithium bromide refrigeration unit 2 .

[0036] Furthermore, the lithium bromide refrigeration unit 2 includes a condenser 21, an evaporator 22 and a heat exchanger 23 connected in sequence, the cooling water of the first cooling tower 3 and / or the cooling water of the second cooling tower 8 are used as the cooling medium of the condenser, and the heat medium water flow channel 24 of the lithium bromide refrigeration unit 2 is located in the heat exchanger 23.

[0037] The cooling water of the first cooling tower 3 and / or the cooling water of the second cooling tower 8 cools down the refrigerant vapor in the condenser 21, turning it into refrigerant liquid and entering the evaporator 22, spraying and cooling the water to be refrigerated or the medium-temperature chilled water to obtain chilled water at a temperature of about 10°C, and part of it flows into the chilled water flow channel of the water-to-water heat exchanger 7 for heat exchange. The medium-temperature chilled water at a temperature of about 15°C after heat exchange flows back to the evaporator 22 for cooling. After the refrigerant liquid in the evaporator 22 absorbs heat, it enters the heat exchanger 23 to absorb heat to obtain refrigerant vapor, which enters the condenser 21, forming a cycle.

[0038] Furthermore, the air compressor 1 is a centrifugal air compressor.

[0039] Furthermore, two sets of independent water pumps are respectively provided on the water outlet pipelines of the first cooling tower 3, the second cooling tower 8 and the lithium bromide refrigeration unit 2, one for use and the other for standby, for easy maintenance and replacement.

Claims

1. An air compressor high-efficiency water-based waste heat recovery refrigeration and cooling system, characterized in that: It includes an air compressor, a lithium bromide refrigeration unit, a first cooling tower, a primary heat exchanger, a secondary heat exchanger, a tertiary heat exchanger, and a water-to-water heat exchanger. The air compressor includes a primary compressor, a secondary compressor, and a tertiary compressor. The primary heat exchanger, the secondary heat exchanger, and the tertiary heat exchanger all have gas flow channels and water flow channels. The water-to-water heat exchanger has a chilled water flow channel and a cooling water flow channel. The gas flow passage of the first-stage compressor and the first-stage heat exchanger, the gas flow passage of the second-stage compressor and the second-stage heat exchanger, the gas flow passage of the third-stage compressor and the third-stage heat exchanger are connected in sequence; The inlet and outlet of the chilled water flow channel of the water-to-water heat exchanger are respectively connected to the chilled water outlet and chilled water inlet of the lithium bromide refrigeration unit, and the inlet of the cooling water flow channel of the water-to-water heat exchanger is connected to the outlet of the first cooling tower; The inlets of the water channels of the primary heat exchanger and the secondary heat exchanger are respectively connected to the outlets of the cooling water channels of the water-to-water heat exchanger or / and the water outlet of the first cooling tower; the outlets of the water channels of the primary heat exchanger and the secondary heat exchanger are respectively connected to the water inlet of the first cooling tower; The water flow channel of the three-stage heat exchanger and the heat medium water flow channel of the lithium bromide refrigeration unit form a loop.

2. The air compressor high-efficiency water-based waste heat recovery refrigeration and cooling system according to claim 1 is characterized in that: The cooling water of the first cooling tower is also used as the cooling medium of the lithium bromide refrigeration unit.

3. The air compressor high-efficiency water-based waste heat recovery refrigeration and cooling system according to claim 1 is characterized in that: The system also includes a second cooling tower, and cooling water of the second cooling tower is used as a cooling medium for the lithium bromide refrigeration unit.

4. The air compressor high-efficiency water-based waste heat recovery refrigeration and cooling system according to claim 2 or 3, characterized in that: The lithium bromide refrigeration unit comprises a condenser, an evaporator and a heat exchanger which are connected in sequence. The cooling water of the first cooling tower and / or the cooling water of the second cooling tower are used as the cooling medium of the condenser. The heat medium water flow channel of the lithium bromide refrigeration unit is located in the heat exchanger.

5. The air compressor high-efficiency water-based waste heat recovery refrigeration and cooling system according to claim 1 is characterized in that: The air compressor is a centrifugal air compressor.

6. The air compressor high-efficiency water-based waste heat recovery refrigeration and cooling system according to claim 2 or 3, characterized in that: Two sets of independent water pumps are respectively arranged on the water outlet pipelines of the first cooling tower, the second cooling tower and the lithium bromide refrigeration unit.

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