Comprehensive utilization system for waste heat of air compressor

Abstract

The utility model belongs to the technical field of air compressor waste heat utilization, and particularly relates to an air compressor waste heat comprehensive utilization system which comprises an air source heat pump unit system, an air compressor system and a waste heat recovery system. According to the air compressor waste heat recycling system, waste heat of the air compressor is recycled, and the improved requirements of refrigeration and heating of industrial plants are met. In winter, waste heat of the air compressor is used for preparing hot water, then the hot water is used as auxiliary energy of the air source heat pump unit, low-frequency energy-saving operation of the air source heat pump is achieved, meanwhile, the problem that the air source heat pump unit starts auxiliary electric heating heat compensation in extremely cold weather in winter is solved, central heating is conducted on an industrial factory building, and energy conservation and environmental protection are achieved. Traditional coal-fired boilers and natural gas boilers are replaced, clean heating is achieved, when waste heat of the air compressor is insufficient, the operation frequency of the air source heat pump is increased, and the heating requirement of the industrial factory building is met; in summer, the air source heat pump unit directly refrigerates the industrial factory building, and hot water prepared by waste heat of the air compressor can be directly used as domestic hot water.

Description

Technical Field

[0001] This utility model belongs to the field of air compressor waste heat utilization technology, and specifically relates to an air compressor waste heat comprehensive utilization system. Background Technology

[0002] Large air compressors are the main equipment in industrial plants. When the air compressor is running, the high-temperature lubricating oil in the system needs to be kept at a certain temperature in order to operate normally. The conventional practice is to install a closed cooling tower to cool the air compressor condenser. Alternatively, a heat exchange device can be installed to convert heat into domestic hot water. In summer, industrial plants generally use industrial fans for natural heat dissipation.

[0003] One method involves using a closed-loop cooling tower, which directly dissipates heat into the atmosphere, resulting in energy waste.

[0004] The method of converting heat energy into domestic hot water using the matching heat exchange device can be entirely achieved by producing domestic hot water through the solar collectors installed in the factory, without realizing the waste heat recovery of the system. Summary of the Invention

[0005] This utility model provides a comprehensive system for utilizing waste heat from air compressors, which can solve the problems pointed out in the background art.

[0006] An air compressor waste heat comprehensive utilization system includes an air source heat pump unit system, an air compressor system, and a waste heat recovery system;

[0007] The air source heat pump unit system includes an air source heat pump unit, air conditioning terminal equipment, a medium outlet pipe and a medium return pipe, and the medium return pipe is sequentially equipped with an intermediate water tank, a circulating water pump and a first temperature sensor.

[0008] The air compressor system includes an air compressor, a heat exchange circulation pipeline, a heat exchanger, and a first control valve and a second temperature sensor installed on the heat exchange circulation pipeline.

[0009] The waste heat recovery system includes a hot water exchange tank, with a heat exchanger installed inside. A first outlet pipe and a first return pipe are connected to the hot water exchange tank. The first outlet pipe is connected to an intermediate water tank, and a second outlet pipe is connected to the intermediate water tank. The second outlet pipe is connected to a first hot water storage tank. The first hot water storage tank is connected to a domestic hot water network via a first connecting pipe, which is equipped with a fifth control valve. A second connecting pipe is provided between the first and second outlet pipes, and a second control valve is provided on the second connecting pipe. A third control valve and a fourth control valve are respectively provided on the first and second outlet pipes, located behind the connection point of the second connecting pipe. The first hot water storage tank is connected to the hot water exchange tank via a first return pipe, which is equipped with a built-in water pump.

[0010] Preferably, the air conditioning terminal equipment is a fan coil unit.

[0011] Preferably, it also includes a solar-powered domestic hot water system, which is connected to the domestic hot water pipe network.

[0012] Preferably, the solar domestic hot water system includes a solar collector, which is connected to a second hot water storage tank via a connecting circulation pipeline, and the second hot water storage tank is connected to the domestic hot water pipeline network.

[0013] Preferably, the air compressor is connected to a duct tee via a pipeline. One end of the duct tee discharges naturally, and the other end is connected to the air source heat pump unit via a duct. The air source heat pump unit is equipped with a process exhaust fan.

[0014] Preferably, the hot water tank has several corrugated guide plates arranged along the height direction, and the corrugated guide plates have several through holes.

[0015] Beneficial Effects: This utility model provides a comprehensive waste heat utilization system for air compressors, realizing the recovery and utilization of waste heat from air compressors while also meeting the improved cooling and heating needs of industrial plants. In winter, the waste heat from the air compressor is used to produce hot water, which is then used as auxiliary energy for the air source heat pump unit, enabling low-frequency energy-saving operation of the air source heat pump. Simultaneously, it solves the problem of supplementing heating by auxiliary electric heating during extremely cold winter weather, and provides centralized heating for industrial plants, replacing traditional coal-fired boilers and natural gas boilers, thus achieving clean heating. When the waste heat from the air compressor is insufficient, the operating frequency of the air source heat pump is increased to ensure the heating needs of the industrial plant. In summer, the air source heat pump unit directly cools the industrial plant, and the hot water produced from the waste heat of the air compressor can be directly used as domestic hot water. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the system of this utility model.

[0017] Figure 2 This is a schematic diagram of the waste heat recovery system of this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the wave-shaped guide plate of this utility model.

[0019] Figure 4 This is a schematic diagram of the air guide tee of this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] The diagram includes the following labels: 11 Air source heat pump unit; 12 Air conditioning terminal equipment; 13 Medium outlet pipe; 14 Medium return pipe; 15 Intermediate water tank; 16 Circulating water pump; 17 First temperature sensor; 21 Air compressor; 22 Heat exchange circulation pipeline; 23 Heat exchanger; 24 First control valve; 25 Second temperature sensor; 3 Waste heat recovery system; 31 Hot water tank; 311 Corrugated guide plate; 312 Through hole; 32 First water outlet pipe; 33 First water return pipe; 34 Second water outlet pipe; 35 Second connecting pipeline; 36 Second control valve; 37 Third control valve; 38 Fourth control valve; 39 Built-in water pump; 41 First hot water storage tank; 42 First connecting pipeline; 43 Fifth control valve; 51 Solar collector; 52 Second hot water storage tank; 61 Air guide tee; 62 Air duct; 63 Process exhaust fan; 64 Self-closing louvers. Detailed Implementation

[0022] The following describes a specific embodiment of the present invention in detail with reference to the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0023] Example 1: As Figure 1-3 As shown in the figure, the present invention provides an air compressor waste heat comprehensive utilization system, including an air source heat pump unit system, an air compressor system and a waste heat recovery system 3;

[0024] The air source heat pump unit system includes an air source heat pump unit 11, an air conditioning terminal device 12, a medium outlet pipe 13 and a medium return pipe 14. An intermediate water tank 15, a circulating water pump 16 and a first temperature sensor 17 are sequentially installed on the medium return pipe 14.

[0025] The air compressor system includes an air compressor 21, a heat exchange circulation pipeline 22, a heat exchanger 23, a first control valve 24 and a second temperature sensor 25 installed on the heat exchange circulation pipeline 22;

[0026] The waste heat recovery system 3 includes a hot water exchange tank 31, with a heat exchanger 23 installed inside the hot water exchange tank 31. The hot water exchange tank 31 is connected to a first outlet pipe 32 and a first return pipe 33. The first outlet pipe 32 is connected to an intermediate water tank 15, and the intermediate water tank 15 is connected to a second outlet pipe 34. The second outlet pipe 34 is connected to a first hot water storage tank 41. The first hot water storage tank 41 is connected to the domestic hot water network through a first connecting pipe 42. A fifth control valve 43 is provided on the first connecting pipe 42. A second connecting pipe 35 is provided between the first outlet pipe 32 and the second outlet pipe 34. A second control valve 36 is provided on the second connecting pipe 35. A third control valve 37 and a fourth control valve 38 are respectively provided on the first outlet pipe 32 and the second outlet pipe 34. The third control valve 37 and the fourth control valve 38 are located behind the connection point of the second connecting pipe 35. The first hot water storage tank 41 is connected to the hot water exchange tank 31 through a first return pipe 33. A built-in water pump 39 is provided on the first return pipe 33.

[0027] Specifically, the air conditioning terminal device 12 is a fan coil unit.

[0028] In some embodiments, a solar-powered domestic hot water system is also included, which is connected to a domestic hot water network.

[0029] In some embodiments, the solar domestic hot water system includes a solar collector 51, which is connected to a second hot water storage tank 52 via a connecting circulation pipeline, and the second hot water storage tank 52 is connected to the domestic hot water network.

[0030] In some embodiments, a plurality of corrugated guide plates 311 are provided in the hot water tank 31 along the height direction, and a plurality of through holes 312 are provided on the corrugated guide plates 311.

[0031] Example 2: As Figure 1 and Figure 4 As shown, in some embodiments, the air compressor 21 is connected to the air duct 61 through a pipeline. One end of the air duct 61 is naturally discharged, and the other end is connected to the air source heat pump unit 11 through the air duct 62. The air source heat pump unit 11 is equipped with a process exhaust fan 63.

[0032] The control logic of this utility model is as follows: This system is controlled by an intelligent control system. The control cabinet is installed in the industrial plant and can be installed close to the air source heat pump unit 11. When the temperature of the second temperature sensor 25 is lower than the set temperature, such as 65°C, the first control valve 24 is closed. The air source heat pump unit 11 is controlled according to the feedback temperature of the first temperature sensor 17. After receiving the closing signal of the first control valve 24, the waste heat recovery system 3 shuts down the built-in water pump 39 and closes the second control valve 36, the third control valve 37, and the fourth control valve 38.

[0033] Summer process conditions: Waste heat recovery system 3 prepares hot water at a set temperature (e.g., 60℃), which is then connected to the domestic hot water network inside the industrial plant through the first hot water storage tank 41; air source heat pump unit 11 provides cooling for the industrial plant until the set temperature is reached; the third control valve 37 and the fourth control valve 38 are closed.

[0034] Winter process conditions: Waste heat recovery system 3 prepares hot water at a set temperature (e.g., 60℃), connects to air source heat pump unit 11 to provide auxiliary heat source for industrial plant, and air source heat pump unit 11 provides heat to industrial plant until the set temperature is reached; close the second control valve 36; close the fifth control valve 43 partially (e.g., close 1 / 2).

[0035] Transitional season process conditions: Waste heat recovery system 3 prepares hot water at a set temperature (e.g., 60℃), which enters the first hot water storage tank 41 and is connected to the domestic hot water pipeline network inside the industrial plant; the third control valve 37 and the fourth control valve 38 are closed;

[0036] Solar collector 51: can be installed on the roof of industrial plant to provide domestic hot water throughout the year, meeting the domestic hot water needs of the plant.

[0037] Air source heat pump unit 11: can be installed on the roof of industrial plant to provide cooling and heating for the industrial plant.

[0038] Process exhaust ventilation: During extreme winter weather, the air compressor's process exhaust ventilation is activated. For example, when the temperature is set to -20 degrees Celsius, the process exhaust fan 63 will run for 20 minutes per hour. The specific frequency and duration of the process exhaust ventilation are automatically adjusted by the control system based on the outdoor air temperature. The outdoor temperature provides hot air to the evaporator side of the air source heat pump unit 11, increasing the air temperature on the evaporator side, reducing defrosting time during winter heating, improving heating efficiency, and simultaneously saving on electric heating power and reducing energy consumption.

[0039] The airflow guide tee 61 has three interfaces: A, B, and C. Interface A connects to natural exhaust ventilation, and interface C connects to the air source heat pump unit 11. The air source heat pump unit 11 is equipped with a process exhaust fan 63. Self-closing louvers 64 are installed at interface A and are normally closed. The diameter of interface A is 1.5 times the diameter of interface B. When the process exhaust fan 63 is turned on, the self-closing louvers 64 close under negative pressure to prevent excessive intake of cold air. When the process exhaust fan 63 is not needed, airflow is exhausted outdoors through the self-closing louver 64 vent from interface A (due to the smaller diameter of interface C and the inherent resistance of the process exhaust fan 63).

[0040] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any variations that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A comprehensive waste heat utilization system for air compressors, characterized in that: This includes air source heat pump unit systems, air compressor systems, and waste heat recovery systems (3); The air source heat pump unit system includes an air source heat pump unit (11), an air conditioning terminal device (12), a medium outlet pipe (13) and a medium return pipe (14). The medium return pipe (14) is provided with an intermediate water tank (15), a circulating water pump (16) and a first temperature sensor (17) in sequence. The air compressor system includes an air compressor (21), a heat exchange circulation pipeline (22), a heat exchanger (23), a first control valve (24) and a second temperature sensor (25) installed on the heat exchange circulation pipeline (22). The waste heat recovery system (3) includes a hot water exchange tank (31), and a heat exchanger (23) is installed inside the hot water exchange tank (31). The hot water exchange tank (31) is connected to a first outlet pipe (32) and a first return pipe (33). The first outlet pipe (32) is connected to the intermediate water tank (15), and the intermediate water tank (15) is connected to a second outlet pipe (34). The second outlet pipe (34) is connected to a first hot water storage tank (41). The first hot water storage tank (41) is connected to the domestic hot water network through a first connecting pipe (42). A fifth control valve (43) is provided on the first connecting pipe (42). A second connecting pipe (35) is provided between the first water outlet pipe (32) and the second water outlet pipe (34). A second control valve (36) is provided on the second connecting pipe (35). A third control valve (37) and a fourth control valve (38) are respectively provided on the first water outlet pipe (32) and the second water outlet pipe (34). The third control valve (37) and the fourth control valve (38) are located behind the connection point of the second connecting pipe (35). The first hot water storage tank (41) is connected to the hot water exchange tank (31) through the first return water pipe (33). A built-in water pump (39) is provided on the first return water pipe (33).

2. The air compressor waste heat comprehensive utilization system according to claim 1, characterized in that: The air conditioning terminal equipment (12) is a fan coil unit.

3. A comprehensive waste heat utilization system for air compressors according to any one of claims 1-2, characterized in that: It also includes a solar-powered domestic hot water system, which is connected to the domestic hot water pipeline network.

4. The air compressor waste heat comprehensive utilization system according to claim 3, characterized in that: The solar-powered domestic hot water system includes a solar collector (51), which is connected to a second hot water storage tank (52) via a connecting circulation pipeline, and is connected to the domestic hot water pipeline network via the second hot water storage tank (52).

5. A comprehensive waste heat utilization system for air compressors according to any one of claims 1-2, characterized in that: The air compressor (21) is connected to the air guide tee (61) through a pipeline. One end of the air guide tee (61) is naturally discharged, and the other end is connected to the air source heat pump unit (11) through the air duct (62). The air source heat pump unit (11) is equipped with a process exhaust fan (63).

6. A comprehensive waste heat utilization system for air compressors according to any one of claims 1-2, characterized in that: The hot water tank (31) has several wavy guide plates (311) arranged along the height direction, and several through holes (312) are provided on the wavy guide plates (311).

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