Air compression cooling water waste heat recycling device

Abstract

The utility model discloses an air compression cooling water waste heat recycling device which comprises an air compressor, the output end of the air compressor is divided into three paths to be connected with the primary side input end of a first heat exchanger, the primary side input end of a second heat exchanger and the input end of a cooling system in parallel, and a first electric valve set is arranged on a connecting pipeline of the air compressor and the first heat exchanger. A second electric valve group is arranged on a connecting pipeline of the air compressor and the second heat exchanger; a third electric valve group is arranged on a connecting pipeline of the output end of the air compressor and the input end of the cooling system; the primary side output end of the first heat exchanger and the primary side output end of the second heat exchanger are connected to the input end of the cooling system in parallel. The secondary side input end of the first heat exchanger is connected with the preheating side output end of the boiler system through a pipeline. A water source heat pump evaporator side output end of the air conditioning system is connected with a secondary side input end of a second heat exchanger through a pipeline; a secondary side output end of the second heat exchanger is connected with a water source heat pump evaporator side input end; the output end of the cooling system is connected with the air compressor cooling water input end.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange, in particular to a device for recovering and utilizing waste heat of compressed air cooling water. Background Art

[0002] The air compressor uses cooling water to reduce the heat generated by the compressed air process to extend the service life of the machine. The outlet temperature of the air compressor cooling water is about 55°C. Usually, the cooling tower spray water and cooling water are used to exchange water with water to reduce the cooling water temperature to 25°C. The heat absorbed by the spray water is taken away by the wind through forced ventilation and wind-water heat exchange. Central air conditioning heating usually uses steam to heat the air to ensure the temperature and humidity of the production process. The boiler needs to ensure 24-hour steam supply.

[0003] Compressed air cooling water has a lot of heat, and this part of the heat is not recycled, resulting in energy waste. The cooling tower brings heat to the atmosphere through forced ventilation heat exchange, causing the atmospheric temperature to rise. Steam is a high-grade energy source. Using steam to heat the air in air conditioning is costly and requires continuous boiler protection. From the perspective of energy users, low-grade energy is most suitable for use in HVAC systems, and the energy quality required is low and close to the ambient state.

[0004] In the existing air compressor waste heat recovery technology, for example, the Chinese utility model patent with patent number CN201720696009.X discloses an air compressor waste heat recovery system, which stores the hot water after the air compressor heat exchange in a hot water storage tank, and then uses a water supply pump to extract the hot water in the hot water storage tank for use. However, the patent still has the following problems: 1. The heat exchange circuit of the patent structure is single, and the heat exchange pipeline cannot be adjusted according to the actual use situation, and the thermal energy utilization efficiency is not high; 2. When the use of hot water in the hot water storage tank is reduced or suspended, and the air compressor is still running, the cooling water of the air compressor cannot be cooled and recycled, resulting in increased power consumption of the air compressor. Summary of the invention

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an air compressor cooling water waste heat recovery and utilization device.

[0006] The utility model is realized by the following technical solutions:

[0007] An air compressor cooling water waste heat recovery and utilization device comprises an air compressor (1), and further comprises:

[0008] A first heat exchanger (2), wherein the primary side input end is connected in series with a first electric valve group (11) through a pipeline and then connected to the cooling water output end of the air compressor (1), and the primary side output end is connected to the input end of the cooling system (6);

[0009] The preheating side output end of the boiler system (3) is connected to the secondary side input end of the first heat exchanger (2), and the secondary side output end of the first heat exchanger (2) is connected to the preheating side input end of the boiler system (3);

[0010] The second heat exchanger (4) has a primary side input end connected in series with a second electric valve group (12) through a pipeline and then connected to a cooling water output end of the air compressor (1), and the primary side output end is connected to an input end of a cooling system (6);

[0011] An air conditioning system (5), the air conditioning system (5) comprising a water source heat pump (51), the evaporator output end of the water source heat pump (51) being connected to the secondary side input end of the second heat exchanger (4), and the secondary side output end of the second heat exchanger (4) being connected to the preheating side input end of the air conditioning system (5);

[0012] The cooling system (6) has an output end connected to the cooling water input end of the air compressor (1); the cooling water output end of the air compressor (1) is connected in series with the third electric valve group (13) and then connected to the input end of the cooling system (6).

[0013] Furthermore, an intermediate water tank (7) and an intermediate water pump group (71) are provided on the pipeline between the output end of the evaporator of the water source heat pump (51) and the secondary side input end of the second heat exchanger (4); the intermediate water pump group (71) is located on the pipeline between the intermediate water tank (7) and the second heat exchanger (4); and the water supply end of the intermediate water tank (7) is connected to a water supply electric valve (72).

[0014] Furthermore, the air conditioning system (5) comprises:

[0015] A water source heat pump (51), wherein the condenser output end is connected to the hot water tank (52) input end;

[0016] The hot water tank (52), the output end of which is connected in series with the hot water pump unit (53) and then connected to the input end of the air conditioning unit (55);

[0017] A first constant-pressure water replenishing device (54), the output end of which is connected to the water replenishing port of the hot water tank (52);

[0018] The hot water pump unit (53) has an output end connected to an input end of the air conditioning unit (55);

[0019] The air conditioning unit (55) has an output end connected to an input end of a condenser of a water source heat pump (51).

[0020] Furthermore, the cooling system (6) comprises:

[0021] The output end of the closed cooling tower (61) is connected to the input end of the cold water tank (62), and the primary side output end of the first heat exchanger (2), the primary side output end of the second heat exchanger (4) and the output end of the third electric valve group (13) are connected in parallel to the input end of the closed cooling tower (61);

[0022] A cold water tank (62), the output end of which is connected to the input end of a cold water pump unit (63);

[0023] A cooling water pump group (63), the output end of which is connected to the cooling water input end of the air compressor (1);

[0024] A second constant-pressure water replenishing device (64), the output end of which is connected to the water replenishing port of the cold water tank (62);

[0025] Furthermore, the first constant-pressure water replenishing device (54) and the second constant-pressure water replenishing device (64) have the same structure, and both include:

[0026] A water replenishment pump (541), wherein the output end of the water replenishment pump (541) of the first constant-pressure water replenishment device (54) is connected to the hot water tank (52), and the output end of the water replenishment pump (541) of the second constant-pressure water replenishment device (64) is connected to the cold water tank (62);

[0027] The expansion water tank (542) is connected to the pipeline between the water supply pump (541) and the water tank through a butterfly valve and a pipeline;

[0028] A butterfly valve, a check valve and a filter are arranged in sequence on the connecting pipeline between the water replenishment pump (541) and the water tank.

[0029] Furthermore, the preheating test of the boiler system (3) comprises:

[0030] A desalted water tank (31), the output end of which is connected to the input end of a preheating water pump group (32);

[0031] A preheating water pump group (32), the output end of which is connected to the input end of the secondary side of the first heat exchanger (2);

[0032] A secondary economizer (33), the input end of which is connected to the output end of the secondary side of the first heat exchanger (2);

[0033] A deaerator (34), the input end of which is connected to the output end of the secondary economizer (33);

[0034] The bypass electric valve group (35) has an input end connected to the output end of the preheating water pump group (32), and an output end connected to the input end of the secondary energy saver (33).

[0035] Furthermore, the preheating water pump group (32), the hot water pump group (53), the cold water pump group (63) and the intermediate water pump group (71) are all formed by at least two pump group pipelines (531) connected in parallel; the pump group one-way pipeline (531) is sequentially formed by a first butterfly valve, a filter, a first flexible joint, a water pump, a second flexible joint, a second butterfly valve, and a check valve connected in series.

[0036] Furthermore, temperature sensors and pressure sensors are provided on the front and rear pipelines of the first heat exchanger (2), the second heat exchanger (4), the cold water pump group (63) and the preheating water pump group (32).

[0037] Furthermore, the bottoms of the hot water tank (52) and the cold water tank (62) are both connected to a sewage tank (521), and a pressure relief solenoid valve and a stopcock are provided on the connecting pipeline between the sewage tank (521) and the water tank.

[0038] A spray pipeline is arranged above the cooling water pipeline in the closed cooling tower (61), the spray pipeline passes through the closed cooling tower (61) and is connected to a spray pump group (611), and the water inlet of the spray pump group (611) is connected to desalted water; a fan (612) is arranged on the top of the closed cooling tower (61).

[0039] The working principle of this utility model:

[0040] Based on the premise of waste heat utilization, the utility model recycles the waste heat of high-temperature cooling water generated by an air compressor (1). The utility model divides the 55°C cooling water of the air compressor (1) into two paths for heat exchange with a boiler system (3) and an air conditioning system (5) respectively.

[0041] The cooling water for heat exchange with the air conditioning system (5) enters the second heat exchanger (4) through the second electric valve group (12) and exchanges heat with the cold water in the intermediate water tank (7). The air-compressed cooling water is cooled down to 25°C after heat exchange, and then returns to the closed cooling tower (61) and enters the cold water tank (62). The cold water pump group (63) provides power for the water flow to enter the air compressor (1) to complete the circulation of the cooling water. The cold water at 20°C in the intermediate water tank (7) is heated to 28°C after heat exchange with the air-compressed cooling water through the heat exchanger and enters the evaporator of the water source heat pump (51). After being cooled to 20°C by the evaporator, it enters the intermediate water tank (7) and is driven by the intermediate water pump group (71) to complete the circulation. When the water level in the intermediate water tank (7) is low, the water replenishment electric valve (72) is opened to replenish the water in the intermediate water tank (7). The hot water at 50°C in the hot water tank (52) is driven by the hot water pump group (53) and sent to the air conditioning unit (55) through the hot water pipe to heat the air. After heating the air, the temperature of the hot water drops to 40°C, and returns to the water source heat pump (51) condenser through the hot water pipe to be heated to 50°C before returning to the hot water tank (52) to complete the circulation of the hot water pipeline. When the liquid level in the hot water tank (52) drops, the expansion water tank (542) automatically replenishes the hot water tank (52) to balance the water pressure. When the water pressure in the expansion water tank (542) is low, the replenishing water pump (541) is automatically started to pressurize the expansion water tank (542).

[0042] The other cooling water for heat exchange with the boiler system (3) enters the first heat exchanger (2) through the second electric valve group (12), and after heat exchange with the normal temperature desalted water in the secondary side desalted water tank (31), the temperature drops to 25°C. The cooling water after heat exchange enters the closed cooling tower (61), and the cooling water enters the cold water tank (62) from the closed cooling tower (61), and the cooling water is driven by the cold water pump group (63) to complete the circulation of the cooling water. The normal temperature desalted water of 20°C in the desalted water tank (31) is heated to 32°C by the first heat exchanger (2), enters the secondary economizer (33), is heated again to 80°C by the flue gas, and enters the deaerator (34). The normal temperature desalted water on the preheating side of the boiler system (3) provides power for the desalted water pipeline through the preheating water pump group (32). A bypass electric valve group (35) is arranged on the pipeline. When the first heat exchanger (2) fails or only the boiler system (3) is in operation, the bypass electric valve group (35) can be opened to provide cold water for the secondary economizer (33).

[0043] When the closed cooling tower (61) is in operation, the spray pump group (611) is started, the internal fan (612) is turned on, and the normal temperature desalted water and the air compressor (1) cooling water are exchanged with each other in a heat exchanger inside the cooling tower to reduce the temperature of the air compressor (1) cooling water. The cold air generated by the fan (612) removes the heat of the spray water to reduce the temperature of the spray water.

[0044] Compared with the prior art, the utility model has the following beneficial effects:

[0045] The waste heat generated by the cooling water of the air compressor (1) of the utility model is mainly exchanged through the first heat exchanger (2) and the second heat exchanger (4) of the heat exchange equipment to provide a heat source for the boiler system (3) and the air conditioning system (5), thereby saving the energy consumption of preheating the water supply of the deaerator (34) of the secondary economizer (33) and the steam energy consumption of the air conditioning unit (55).

[0046] The utility model can greatly reduce steam consumption by recycling waste heat from compressed air cooling water, replace high-grade heat sources with low-grade heat sources, improve thermal system efficiency, reduce system energy consumption, adapt to production heat demand, achieve clean production and energy conservation and consumption reduction, improve energy resource utilization efficiency, and continuously reduce energy resource consumption and carbon emissions per unit output.

[0047] The boiler system (3), air conditioning system (5) and air compressor (1) of the utility model can control the opening and closing of their heat exchange pipelines individually through the first electric valve group (11), the second electric valve group (12) and the third electric valve group (13), and can be adjusted according to the actual operation conditions of the factory area, selectively exchange heat according to the working conditions of the air conditioning unit (55) and the boiler, maximize the use of the waste heat of the air compressor, and are easy to operate and meet the production heat demand.

[0048] The cooling water circuit of the air compressor (1) and the water flow circuit of the air conditioning unit (55) of the utility model are both provided with a constant pressure water replenishing device (54, 64), which can automatically replenish water to the cold water tank (62) and the hot water tank (52). The cold water tank (62) and the hot water tank (52) are both connected to a sewage tank (521) and a pressure relief solenoid valve, which can reduce the number of times that the staff checks and maintains the water tank and replenishes water, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a schematic diagram of the pipeline structure of the utility model;

[0050] Figure 2 This is a principle block diagram of the utility model;

[0051] Figure 3 This is a schematic diagram of the piping structure of the heat exchange of the boiler system of the utility model;

[0052] Figure 4 This is a schematic diagram of the piping structure of the heat exchange of the air conditioning system of the utility model;

[0053] Figure 5 The utility model is a schematic diagram of the piping structure of the air compressor and the cooling system.

[0054] Numbers in the figure:

[0055] 1-air compressor, 11-first electric valve group, 12-second electric valve group, 13-third electric valve group;

[0056] 2- first heat exchanger;

[0057] 3- boiler system, 31- demineralized water tank, 32- preheating water pump group, 33- secondary economizer, 34- deaerator, 35- bypass electric valve group;

[0058] 4- Second heat exchanger;

[0059] 5-air conditioning system, 51-water source heat pump, 52-hot water tank, 521-sewage tank, 53-hot water pump group, 54-first constant pressure water replenishment device, 541-water replenishment pump, 542-expansion water tank, 55-air conditioning unit;

[0060] 6-cooling system, 61-closed cooling tower, 611-water pump group, 612-fan, 62-cold water tank, 63-cold water pump group, 64-second constant pressure water supply device;

[0061] 7-intermediate water tank, 71-intermediate water pump group, 72-water supply electric valve. DETAILED DESCRIPTION

[0062] In order to enable those skilled in the art to better understand the technical solution of the utility model, its specific implementation method is described in detail below with reference to the accompanying drawings.

[0063] like Figure 1-5 As shown, a device for recovering waste heat of air compressor cooling water comprises an air compressor 1, wherein the output end of the air compressor 1 is divided into three paths connected in parallel with the primary input end of the first heat exchanger 2, the primary input end of the second heat exchanger 4 and the input end of the cooling system 6, a first electric valve group 11 is arranged on the connecting pipeline between the air compressor 1 and the first heat exchanger 2, a second electric valve group 12 is arranged on the connecting pipeline between the air compressor 1 and the second heat exchanger 4, and a third electric valve group 13 is arranged on the connecting pipeline between the cooling water output end of the air compressor 1 and the input end of the cooling system 6; the primary output end of the first heat exchanger 2 and the primary output end of the second heat exchanger 4 are connected in parallel with the input end of the cooling system 6; the secondary input end of the first heat exchanger 2 is connected to the preheating side output end of the boiler system 3; the air conditioning system 5 comprises a water source heat pump 51, the evaporator output end of the water source heat pump 51 is connected to the secondary input end of the second heat exchanger 4, and the secondary output end of the second heat exchanger 4 is connected to the evaporator input end of the water source heat pump 51; the output end of the cooling system 6 is connected to the cooling water input end of the air compressor 1.

[0064] In an embodiment, Figure 4 As shown, an intermediate water tank 7 and an intermediate water pump group 71 are arranged on the pipeline between the output end of the evaporator of the water source heat pump 51 and the secondary side input end of the second heat exchanger 4. The intermediate water pump group 71 is located on the pipeline between the intermediate water tank 7 and the second heat exchanger 4; the water replenishment end of the intermediate water tank 7 is connected to a water replenishment electric valve 72.

[0065] The cold water in the intermediate water tank 7 enters the second heat exchanger 4 through the intermediate water pump group 71, is heated to 28°C by the cooling water of the air compressor 1, and then enters the evaporator of the water source heat pump 51 to be cooled to 20°C and returns to the intermediate water tank 7. A liquid level gauge is provided in the intermediate water tank 7, and water is automatically replenished through the water replenishment electric valve 72 according to the liquid level recorded by the liquid level gauge.

[0066] In an embodiment, Figure 4 As shown, the air-conditioning system 5 includes a water source heat pump 51, a hot water tank 52, a hot water pump group 53, a first constant-pressure water replenishment device 54 and an air-conditioning unit 55. The output end of the condenser of the water source heat pump 51 is connected to the input end of the hot water tank 52; the output end of the hot water tank 52 is connected in series with the hot water pump group 53 and then connected to the input end of the air-conditioning unit 55; the water replenishment port of the hot water tank 52 is connected to the output end of the first constant-pressure water replenishment device 54, and the output end of the hot water pump group 53 is connected to the input end of the air-conditioning unit 55; the output end of the air-conditioning unit 55 is connected to the input end of the condenser of the water source heat pump 51.

[0067] The hot water at 50°C in the hot water tank 52 is sent to the air conditioning unit 55 through the hot water pump group 53 to heat the air. The hot water heated by the air conditioning unit 55 is returned to the water source heat pump 51 condenser after the temperature drops to 40°C and is heated to 50°C before returning to the hot water tank 52 for recycling. The water replenishment of the hot water tank 52 is achieved through the first constant pressure water replenishment device 54.

[0068] In an embodiment, Figure 5 As shown, the cooling system 6 includes a closed cooling tower 61, a cold water tank 62, a cold water pump group 63, and a second constant-pressure water replenishment device 64. The output end of the closed cooling tower 61 is connected to the input end of the cold water tank 62, and the primary side output end of the first heat exchanger 2, the primary side output end of the second heat exchanger 4 and the output end of the third electric valve group 13 are connected in parallel to the input end of the closed cooling tower 61; the output end of the cold water tank 62 is connected to the input end of the cold water pump group 63; the output end of the cold water pump group 63 is connected to the cooling water input end of the air compressor 1; the output end of the second constant-pressure water replenishment device 64 is connected to the water replenishment port of the cold water tank 62.

[0069] If the air conditioning system 5 and the boiler system 3 fail to fully utilize the waste heat of the air compressor 1, the excess heat is dissipated through the closed cooling tower 61 to ensure that the return water temperature of the cooling water of the air compressor 1 is reduced to 25°C. The closed cooling tower 61 operates at a variable frequency according to the temperature of the cold water tank 62, and the temperature setting value of the cold water tank 62 is 25°C.

[0070] In an embodiment, Figure 4 , 5 As shown, the first constant-pressure water replenishment device 54 and the second constant-pressure water replenishment device 64 have the same structure, both including a water replenishment pump 541 and an expansion water tank 542. The output end of the water replenishment pump 541 of the first constant-pressure water replenishment device 54 is connected to the hot water tank 52, and the output end of the water replenishment pump 541 of the second constant-pressure water replenishment device 64 is connected to the cold water tank 62; the expansion water tank 542 is connected to the pipeline between the water replenishment pump 541 and the water tank through a butterfly valve and a pipeline;

[0071] A butterfly valve, a check valve and a filter are sequentially arranged on the connecting pipeline between the water supply pump 541 and the water tank.

[0072] When the water pressure in the expansion water tank 542 is low, the water replenishment pump 541 is automatically started to pressurize it. When the liquid level in the hot water tank 52 is lower than the position of the internal float valve, the hot water tank 52 is replenished with water through the first constant-pressure water replenishment device 54. The first constant-pressure water replenishment device 54 is used to compensate for the evaporation of the water flow circuit between the evaporator of the water source heat pump 51 and the air-conditioning unit 55.

[0073] When the water pressure in the expansion water tank 542 is low, the water replenishment pump 541 is automatically started to pressurize it. When the liquid level in the cold water tank 62 is lower than the position of the internal float valve, the cold water tank 62 is replenished with water through the second constant-pressure water replenishment device 64. The second constant-pressure water replenishment device 64 is used to compensate for the evaporation of the water flow circuit between the air compressor 1, the primary side of the first heat exchanger 2, the primary side of the second heat exchanger 4 and the cooling system 6.

[0074] In an embodiment, Figure 3 As shown, the preheating side of the boiler system 3 includes a desalted water tank 31, a preheated water pump group 32, a secondary economizer 33, a deaerator 34 and a bypass electric valve group 35. The output end of the desalted water tank 31 is connected to the input end of the preheated water pump group 32; the output end of the preheated water pump group 32 is connected to the input end of the secondary side of the first heat exchanger 2; the input end of the secondary economizer 33 is connected to the output end of the secondary side of the first heat exchanger 2; the input end of the deaerator 34 is connected to the output end of the secondary economizer 33; the bypass electric valve group 35, the input end is connected to the output end of the preheated water pump group 32, and the output end is connected to the input end of the secondary economizer 33.

[0075] When the air compressor 1 and the boiler system 3 are running, the 55°C cooling water of the air compressor is connected to the boiler room, and heat is exchanged with the normal temperature feed water of the deaerator 34 from the desalted water tank 31 through the first heat exchanger 2, and the temperature of the cooling water of the air compressor 1 on the primary side of the first heat exchanger 2 is reduced to 25°C. The feed water of the deaerator 34 can be preheated to 32°C on the secondary side of the first heat exchanger 2, and then enters the secondary economizer of the boiler. In this cycle, the cooling water of the air compressor is reduced from 55°C to 25°C, which maximizes the use of the waste heat of the cooling water of the air compressor and ensures the normal operation of the air compressor.

[0076] When the air compressor 1 is not running, the bypass electric valve group 35 is opened, and the boiler desalted water enters the deaerator 34 through the secondary economizer 33.

[0077] In an embodiment, Figure 1-5 As shown, the preheating water pump group 32, the hot water pump group 53, the cold water pump group 63 and the intermediate water pump group 71 are all composed of at least two pump group pipelines 531 in parallel; the pump group one-way pipeline 531 is composed of a first butterfly valve, a filter, a first flexible joint, a water pump, a second flexible joint, a second butterfly valve, and a check valve in series.

[0078] In an embodiment, Figure 1-5 As shown, temperature sensors and pressure sensors are provided on the front and rear pipelines of the first heat exchanger 2, the second heat exchanger 4, the cold water pump group 63 and the preheating water pump group 32. The temperature sensor is used to detect the water flow temperature in each pipeline, and the pressure sensor is used to detect the water pressure in each pipeline.

[0079] In the embodiment, the first heat exchanger 2 and the second heat exchanger 4 are plate-type water-to-water heat exchangers, and one side of the heat exchanger is generally divided into a primary side and a secondary side:

[0080] The primary side, also called the working side or heat source side, refers to the side where the fluid enters the heat exchanger and is responsible for heat and mass transfer. It is usually a high-temperature, high-pressure fluid such as steam or hot water, which may be heat from a boiler or other heat source.

[0081] The secondary side, also called the user side or heat user side, refers to the side where the fluid flows out of the heat exchanger, where the fluid receives and uses the heat previously transferred to complete a specific task, such as heating, cooling or supplying hot water to homes or public places.

[0082] In an embodiment, Figure 4 , 5 As shown, the bottoms of the hot water tank 52 and the cold water tank 62 are connected to the sewage tank 521, and a pressure relief solenoid valve and a plug valve are provided on the connecting pipeline between the sewage tank 521 and the water tank to facilitate the removal of sludge deposited at the bottom of the hot water tank 52 and the cold water tank 62.

[0083] In an embodiment, Figure 5 As shown, a spray pipeline is arranged above the cooling water pipeline in the closed cooling tower 61, and the spray pipeline passes through the closed cooling tower 61 and is connected to a spray pump group 611, and the water inlet of the spray pump group 611 is connected to desalted water; a fan 612 is arranged on the top of the closed cooling tower 61.

[0084] Working mode of the utility model:

[0085] Method 1: The air compressor is running, and the boiler and air conditioning unit are not running

[0086] At this time, the third electric valve group 13 is opened, and the cooling water at 55°C generated by the operation of the air compressor 1 enters the closed cooling tower 61 through the third electric valve group 13. The cooling water of the air compressor 1 is cooled to 25°C after heat exchange with the normal temperature desalted water in the closed cooling tower 61, and then flows into the cold water tank 62. The cold water in the cold water tank 62 enters the air compressor 1 through the cold water pump group 63 to cool the air compressor 1, thereby forming a circulation of air compressor cooling water. At this time, the first electric valve group 11 and the second electric valve group 12 are closed, and the cooling water of the air compressor 1 does not enter the first heat exchanger 2 and the second heat exchanger 4 for heat exchange.

[0087] When the closed cooling tower 61 is in operation, the spray pump group 611 is started, the internal fan 612 is turned on, and the normal temperature desalted water and the cooling water of the air compressor 1 are exchanged with each other in the heat exchanger inside the cooling tower to reduce the cooling water temperature of the air compressor 1. The cold air generated by the fan 612 takes away the heat of the spray water to reduce the spray water temperature.

[0088] The cold water tank 62 is provided with a temperature sensor for real-time detection of the cold water temperature. The water replenishment of the cold water tank is achieved through a second constant-pressure water replenishment device 64. When the water pressure in the expansion water tank 542 is low, the water replenishment pump 541 is automatically started to pressurize the expansion water tank 542. When the liquid level in the cold water tank 62 is lower than the position of the internal float valve, the water replenishment pump 541 is automatically started to replenish the cold water tank 62.

[0089] Method 2: The air compressor and air conditioning unit are running, but the boiler is not running

[0090] The cooling water at 55°C generated by the operation of the air compressor 1 first enters the second heat exchanger 4 and exchanges heat with the cold water in the intermediate water tank 7. At this time, the second electric valve group 12 is opened, and the first electric valve group 11 and the third electric valve group 13 are closed. The compressed air cooling water is cooled by heat exchange and the temperature drops to 25°C. Then it returns to the closed cooling tower 61 and enters the cold water tank 62. The cold water pump group 63 provides power for the water flow to complete the circulation of the cooling water.

[0091] The cold water at 20°C in the intermediate water tank 7 is heated to 28°C by the compressed air cooling water through the heat exchanger and enters the evaporator of the water source heat pump 51. After being cooled to 20°C by the evaporator, it enters the intermediate water tank 7 and is driven by the intermediate water pump group 71 to complete the circulation. A liquid level gauge is provided in the intermediate water tank 7. When the water level in the intermediate water tank 7 is low, the water replenishment electric valve 72 is opened to complete the water replenishment of the intermediate water tank 7.

[0092] The hot water at 50°C in the hot water tank 52 is driven by the hot water pump group 53 and sent to the air conditioning unit 55 through the hot water pipe to heat the air. After heating the air, the temperature of the hot water drops to 40°C, and returns to the water source heat pump 51 condenser through the hot water pipe to be heated to 50°C before returning to the hot water tank 52 to complete the circulation of the hot water pipeline. The hot water tank 52 is equipped with a first constant pressure water replenishment device 54. When the liquid level in the hot water tank 52 drops, the expansion water tank 542 automatically replenishes the hot water tank 52 to balance the water pressure. When the water pressure in the expansion water tank 542 is low, the water replenishment pump 541 is automatically started to pressurize the expansion water tank 542.

[0093] Method 3: The air compressor, boiler, and air conditioning unit are all running

[0094] The operation of the air compressor 1 generates cooling water at 55°C, which enters the second heat exchanger 4 on the water source heat pump 51 side through the second electric valve group 12, and then exchanges heat with the cold water in the intermediate water tank 7 to 25°C. Another 55°C compressed air cooling water enters the primary side of the first heat exchanger 2 through the first electric valve group 11, and the temperature drops to 25°C after heat exchange with the normal temperature demineralized water in the secondary side demineralized water tank 31. The cooling water after heat exchange on the primary side of the second heat exchanger 4 is mixed with the cooling water after heat exchange on the primary side of the first heat exchanger 2 and enters the closed cooling tower 61. The cooling water enters the cold water tank 62 from the closed cooling tower 61, and the circulation of the cooling water is completed by driving the cold water pump group 63. At this time, the first electric valve group 11 and the second electric valve group 12 are opened, and the third electric valve group 13 is closed.

[0095] In the boiler system 3, the 20°C normal temperature desalted water in the desalted water tank 31 is heated to 32°C by the first heat exchanger 2, enters the secondary economizer 33, is heated again to 80°C by the flue gas, and enters the deaerator 34. The normal temperature desalted water on the preheating side of the boiler system 3 provides power for the desalted water pipeline through the preheating water pump group 32. A bypass electric valve group 35 is provided on this pipeline. When the first heat exchanger 2 fails or only the boiler system 3 is running, the bypass electric valve group 35 can be opened to provide cold water for the secondary economizer 33.

[0096] The circulation of cold water in the air conditioning system 5 and the intermediate water tank 7 is the same as in mode 2.

[0097] It should be noted that the above detailed introduction of the technical solution of the utility model and the description of the principle of the utility model are provided, and the above description of the working principle is only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0098] The technical personnel in the technical field of the utility model can make modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, which shall fall within the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An air compressor cooling water waste heat recovery device, comprising an air compressor (1), characterized in that: Also includes: A first heat exchanger (2), wherein the primary side input end is connected in series with a first electric valve group (11) through a pipeline and then connected to the cooling water output end of the air compressor (1), and the primary side output end is connected to the input end of the cooling system (6); The preheating side output end of the boiler system (3) is connected to the secondary side input end of the first heat exchanger (2), and the secondary side output end of the first heat exchanger (2) is connected to the preheating side input end of the boiler system (3); The second heat exchanger (4) has a primary side input end connected in series with a second electric valve group (12) through a pipeline and then connected to a cooling water output end of the air compressor (1), and the primary side output end is connected to an input end of a cooling system (6); An air conditioning system (5), the air conditioning system (5) comprising a water source heat pump (51), the evaporator output end of the water source heat pump (51) being connected to the secondary side input end of the second heat exchanger (4), and the secondary side output end of the second heat exchanger (4) being connected to the evaporator input end of the water source heat pump (51); The cooling system (6) has an output end connected to the cooling water input end of the air compressor (1); the cooling water output end of the air compressor (1) is connected in series with the third electric valve group (13) and then connected to the input end of the cooling system (6).

2. The air compression cooling water waste heat recovery and utilization device according to claim 1 is characterized in that: An intermediate water tank (7) and an intermediate water pump group (71) are provided on the pipeline between the output end of the evaporator of the water source heat pump (51) and the secondary side input end of the second heat exchanger (4); the intermediate water pump group (71) is located on the pipeline between the intermediate water tank (7) and the second heat exchanger (4); and the water supply end of the intermediate water tank (7) is connected to a water supply electric valve (72).

3. The air compression cooling water waste heat recovery and utilization device according to claim 1 is characterized in that: The air conditioning system (5) comprises: A water source heat pump (51), wherein the condenser output end is connected to the hot water tank (52) input end; The hot water tank (52), the output end of which is connected in series with the hot water pump unit (53) and then connected to the input end of the air conditioning unit (55); A first constant-pressure water replenishing device (54), the output end of which is connected to the water replenishing port of the hot water tank (52); The hot water pump unit (53) has an output end connected to an input end of the air conditioning unit (55); The air conditioning unit (55) has an output end connected to an input end of a condenser of a water source heat pump (51).

4. The air compression cooling water waste heat recovery and utilization device according to claim 3 is characterized in that: The cooling system (6) comprises: The output end of the closed cooling tower (61) is connected to the input end of the cold water tank (62), and the primary side output end of the first heat exchanger (2), the primary side output end of the second heat exchanger (4) and the output end of the third electric valve group (13) are connected in parallel to the input end of the closed cooling tower (61); A cold water tank (62), the output end of which is connected to the input end of a cold water pump unit (63); A cooling water pump group (63), the output end of which is connected to the cooling water input end of the air compressor (1); The second constant-pressure water replenishing device (64) has an output end connected to a water replenishing port of the cold water tank (62).

5. The air compression cooling water waste heat recovery and utilization device according to claim 4 is characterized in that: The first constant-pressure water replenishing device (54) and the second constant-pressure water replenishing device (64) have the same structure, and both include: A water replenishment pump (541), wherein the output end of the water replenishment pump (541) of the first constant-pressure water replenishment device (54) is connected to the hot water tank (52), and the output end of the water replenishment pump (541) of the second constant-pressure water replenishment device (64) is connected to the cold water tank (62); The expansion water tank (542) is connected to the pipeline between the water supply pump (541) and the water tank through a butterfly valve and a pipeline; A butterfly valve, a check valve and a filter are sequentially arranged on the connecting pipeline between the water replenishment pump (541) and the water tank.

6. The air compression cooling water waste heat recovery and utilization device according to claim 5 is characterized in that: The preheating test of the boiler system (3) comprises: A desalted water tank (31), the output end of which is connected to the input end of a preheating water pump group (32); A preheating water pump group (32), the output end of which is connected to the input end of the secondary side of the first heat exchanger (2); A secondary economizer (33), the input end of which is connected to the output end of the secondary side of the first heat exchanger (2); A deaerator (34), the input end of which is connected to the output end of the secondary economizer (33); The bypass electric valve group (35) has an input end connected to the output end of the preheating water pump group (32), and an output end connected to the input end of the secondary energy saver (33).

7. The air compression cooling water waste heat recovery and utilization device according to claim 6 is characterized in that: The preheating water pump group (32), the hot water pump group (53), the cold water pump group (63) and the intermediate water pump group (71) are all formed by at least two pump group pipelines (531) connected in parallel; the pump group one-way pipeline (531) is sequentially formed by a first butterfly valve, a filter, a first flexible joint, a water pump, a second flexible joint, a second butterfly valve and a check valve connected in series.

8. The air-compressed cooling water waste heat recovery and utilization device according to claim 4 is characterized in that: Temperature sensors and pressure sensors are provided on the front and rear pipelines of the first heat exchanger (2), the second heat exchanger (4), the cold water pump group (63) and the preheating water pump group (32).

9. The air compression cooling water waste heat recovery and utilization device according to claim 4 is characterized in that: The bottoms of the hot water tank (52) and the cold water tank (62) are both connected to a sewage tank (521), and a pressure relief solenoid valve and a stopcock are provided on the connecting pipeline between the sewage tank (521) and the water tank.

10. The air compression cooling water waste heat recovery and utilization device according to claim 4 is characterized in that: A spray pipeline is arranged above the cooling water pipeline in the closed cooling tower (61), the spray pipeline passes through the closed cooling tower (61) and is connected to a spray pump group (611), and the water inlet of the spray pump group (611) is connected to desalted water; a fan (612) is arranged on the top of the closed cooling tower (61).

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