Air compressor heat recovery hot water system

Abstract

The utility model belongs to the field of waste heat recovery, and provides an air compressor heat recovery hot water system which comprises an air compressor system, a heat recovery device and a hot water application system. The heat recovery device comprises a heat recovery unit and a heat preservation water tank, a main component in the heat recovery unit is a heat exchanger, the primary side of the heat exchanger of the heat recovery unit is connected with the air compressor system through a pipeline, the secondary side of the heat exchanger of the heat recovery unit is connected with the heat preservation water tank through a pipeline, and the heat preservation water tank is connected with the hot water application system through a pipeline. The heat recovery device is used for absorbing waste heat of the air compressor system and providing hot water for the hot water application system to use through the waste heat. The heat energy generated in the compression process of the air compressor is recycled, the energy utilization efficiency can be improved, a reliable heat source can be provided for various industrial and commercial applications, and the energy-saving effect of the air compressor is achieved. In addition, waste heat recovery of the air compressor can effectively reduce environmental pollution, and green low-carbon production is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of waste heat recovery, and relates to a hot water system for heat recovery of an air compressor. BACKGROUND

[0002] Industrial heat consumption accounts for more than 60% of the total heat consumption in China, and is the main field of heat consumption in China. More than half of the energy consumed by industries in China is converted into waste heat in the form of waste gas and waste water, of which only 30% is reused, which is one of the reasons for low energy utilization efficiency.

[0003] Air compressors are widely used in mechanical manufacturing, chemical industry, metallurgy, mining, power, refrigeration, medicine, textile, automobile, food and other industries, and are important equipment indispensable in industrial production. The power consumption of air compressors in industrial production is often high, and during the working process of the air compressor, about 80% of the input electric energy is converted into heat, and only about 20% is converted into the final compressed air energy. After the electric energy consumed by the compressor during the working process is converted into heat, most of the heat is carried away by the compressed oil-gas mixture. The oil-gas mixture is separated into high-temperature compressed air and high-temperature oil in the oil-gas separator, and the high-temperature compressed air and the high-temperature oil are respectively carried away by the cooling medium in the respective coolers: the high-temperature compressed air is cooled in the air cooler, and the high-temperature oil is cooled in the oil cooler, and the heat is dissipated into the atmosphere, causing heat waste. These unused heat not only affects the environment, but also causes production enterprises to give up valuable heat energy resources.

[0004] On the other hand, industrial production enterprises usually also have some process flows that need to be heated, such as process cleaning water pools, the water temperature in the process cleaning water pool needs to be kept within a range, such as 30℃~40℃, all year round, the process cleaning water pool is used to clean the paint on the mold, and often needs to be replaced with water, the municipal water temperature is low, and in addition to the heat dissipation on the surface of the process cleaning water pool, a heat source is needed to heat all year round, and the process cleaning water pool is heated by electric heating; in addition, the kitchen, bath and other living scenes of the industrial production enterprise also have hot water demand, and hot water heating is mostly heated by electric water heaters. Electric heating is low in efficiency, high in energy consumption and high in operating cost.

[0005] Therefore, actively recovering the waste heat generated by the air compressor of industrial production and applying it to other process flows or living scenes of industrial production not only saves energy and protects the environment, but also achieves economic benefits, which is of great significance. Utility model content

[0006] In order to solve the above problems, the utility model provides a kind of air compressor heat recovery hot water system.The present application does not change the existing working condition of air compressor under the premise, reasonably utilizes air compressor waste heat, cooling water is cooled down rapidly by heat exchanger through water pump to the hot oil of air compressor, is converted into hot water heat source by heat recovery device for production process, kitchen or worker shower etc., does not need to additionally increase large operating cost;Meanwhile, the present application also optimizes air compressor hot oil cooling, realizes the effect of air compressor energy saving.

[0007] To achieve the above object, the technical scheme provided by the utility model is as follows:

[0008] An air compressor heat recovery hot water system, comprising an air compressor system 1, a heat recovery device, and a hot water application system;The heat recovery device includes a heat recovery unit 2 and a heat preservation water tank 5, the internal components of the heat recovery unit 2 include a heat exchanger, the heat exchanger of the heat recovery unit 2 is connected to the air compressor system through a pipeline, the heat exchanger of the heat recovery unit is connected to the heat preservation water tank 5 through a pipeline, and the heat preservation water tank 5 is connected to the hot water application system through a pipeline;The heat recovery device is used to absorb the waste heat of the air compressor system 1 and provide hot water for the hot water application system.

[0009] Specifically, the air compressor system 1 includes an air suction inlet 1-1, an air filter 1-2, a screw compressor 1-3, an oil-gas mixing pipe 1-4, an oil-gas separator 1-5, a temperature control valve 1-6, an oil cooler return pipe 1-7, an oil cooler oil supply pipe 1-8, an oil cooler 1-9, an oil supply main pipe 1-10, an exhaust pipe 1-11, an air cooler 1-12, a compressed air supply pipe 1-13, and a cooling fan 1-14.

[0010] The inlet of the air filter 1-2 is connected to the air suction inlet 1-1, and the outlet is connected to the screw compressor 1-3 through a pipeline;

[0011] The screw compressor 1-3 is connected to the oil-gas separator 1-5 through the oil-gas mixing pipe 1-4;

[0012] The top of the oil-gas separator 1-5 is provided with an air outlet, the air outlet is connected to the inlet of the air cooler 1-12 through the exhaust pipe 1-11, and the outlet of the air cooler 1-12 is connected to the end user through the compressed air supply pipe 1-13;

[0013] The lower part of the oil-gas separator 1-5 is provided with a lubricating oil outlet, which is transported to the heat exchanger primary side inlet of the heat recovery unit 2 of the heat recovery device through the oil return pipeline 3, the heat exchanger primary side outlet of the heat recovery unit 2 of the heat recovery device is connected to the inlet of the oil cooler 1-9 in sequence through the oil supply pipeline 4, the temperature control valve 1-6 and the oil cooler return oil pipe 1-7, and the outlet of the oil cooler 1-9 is connected to the oil tank of the screw compressor 1-3 in sequence through the oil cooler oil supply pipe 1-8, the temperature control valve 1-6 and the oil supply main pipe 1-10; the temperature control valve 1-6 is connected with the oil supply pipeline 4, the oil cooler return oil pipe 1-7, the oil cooler oil supply pipe 1-8 and the oil supply main pipe 1-10.

[0014] Specifically, the heat recovery device, the heat exchanger primary side loop of the heat recovery unit 2 is a lubricating oil passage, and the lubricating oil flows inside; the heat exchanger secondary side loop is a water passage, and water flows inside;

[0015] The heat exchanger secondary side outlet of the heat recovery unit 2 is connected to the inlet of the upper part of the heat preservation water tank 5 through the water supply pipeline 10; the heat exchanger secondary side inlet of the heat recovery unit 2 is connected to the outlet of the lower part of the heat preservation water tank 5 through the water return pipeline 9;

[0016] The heat recovery device further comprises a heat recovery circulating water pump 8 and a temperature controller 7; the heat recovery circulating water pump 8 is arranged on the water return pipeline 9; the temperature controller 7 is connected with the heat preservation water tank 5 and is electrically connected with the heat recovery circulating water pump 8;

[0017] The heat recovery device further comprises a water replenishment electromagnetic valve 12 and a liquid level controller 6; the top of the heat preservation water tank 5 is provided with a tap water inlet connected with tap water through a tap water replenishment pipeline 11, and the water replenishment electromagnetic valve 12 is arranged on the tap water replenishment pipeline 11; the liquid level controller 6 is connected with the heat preservation water tank 5 and is electrically connected with the water replenishment electromagnetic valve 12.

[0018] Specifically, the hot water application system applies the hot water generated by the waste heat recovered by the heat recovery device to process flow water heating or uses it as domestic hot water; the hot water application system comprises a hot water supply main pipe 24, a hot water supply pump 23, a water pump frequency conversion controller 13 with a water supply pressure sensor, a process water branch and a domestic water branch, and a hot water return main pipe 14, wherein:

[0019] The hot water supply main pipe 24 is connected to the outlet of the bottom of the heat preservation water tank 5;

[0020] The hot water supply pump 23 and the water pump frequency conversion controller 13 with a water supply pressure sensor are arranged on the hot water supply main pipe 24, and the hot water supply pump 23 is electrically connected with the water pump frequency conversion controller 13 with a water supply pressure sensor;

[0021] The process water branch and the domestic water branch are connected in parallel between the hot water supply main pipe 24 and the hot water return main pipe 14 as two hot water branches.

[0022] More specifically, the process water branch includes a process cleaning water tank supply branch pipe 21, a process cleaning water tank 16, a process cleaning water tank return branch pipe 22, a temperature control electromagnetic valve 17, and a temperature sensor-equipped temperature controller 18.

[0023] The process cleaning water tank 16 is connected to the hot water supply main pipe 24 through the process cleaning water tank supply branch pipe 21 and connected to the hot water return main pipe 14 through the process cleaning water tank return branch pipe 22.

[0024] The temperature control electromagnetic valve 17 is installed on the process cleaning water tank return branch pipe 22, and the temperature sensor-equipped temperature controller 18 is installed on the lower part of the outer wall of the process cleaning water tank 16, and the temperature control electromagnetic valve 17 and the temperature sensor-equipped temperature controller 18 are electrically connected.

[0025] Further, the process cleaning water tank 16 is composed of a water tank inner wall 16-3 and a water tank bottom to form a water storage space, and the water tank bottom is provided with a serpentine heating pipe 16-1; the inlet of the serpentine heating pipe 16-1 is connected to the process cleaning water tank supply branch pipe 21, and the outlet is connected to the process cleaning water tank return branch pipe 22; a protection plate 16-2 is installed above the serpentine heating pipe 16-1.

[0026] More specifically, the domestic water branch includes a domestic water supply branch pipe 19, a plurality of domestic hot water taps 15, and a domestic water return branch pipe 20; the domestic hot water taps 15 are connected to the hot water supply main pipe 24 through the domestic water supply branch pipe 19 and connected to the hot water return main pipe 14 through the domestic water return branch pipe 20.

[0027] Compared with the prior art, the application has the following beneficial effects:

[0028] The application recycles the heat energy generated in the compression process of the air compressor, which not only improves the energy utilization efficiency, but also provides a reliable heat source for various industrial and commercial applications, achieving the effect of energy saving. In addition, air compressor waste heat recovery can effectively reduce environmental pollution and achieve green and low-carbon production. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of an air compressor heat recovery hot water system.

[0030] Figure 2 It is a schematic structural diagram of a process cleaning water tank system.

[0031] Figure 3 It is a front view of a process cleaning water tank.

[0032] Figure 4 Figure 1 is a top view of a process cleaning water tank.

[0033] Figure 5 Figure 2 is a left view of a process cleaning water tank.

[0034] Reference signs:

[0035] 1, air compressor, 2, heat recovery unit, 3, oil return pipeline, 4, oil supply pipeline, 5, heat preservation water tank, 6, liquid level controller, 7, temperature controller, 8, heat recovery circulating water pump, 9, water return pipeline, 10, water supply pipeline, 11, tap water makeup pipeline, 12, makeup electromagnetic valve, 13, water pump frequency conversion controller with water supply pressure sensor, 14, hot water return main pipe, 15, domestic hot water cock, 16, process cleaning water tank, 17, temperature control electromagnetic valve, 18, temperature controller with temperature sensor, 19, domestic water supply branch pipe, 20, domestic water return branch pipe, 21, process cleaning water tank water supply branch pipe, 22, process cleaning water tank water return branch pipe, 23, hot water pump, 24, hot water supply main pipe;

[0036] 1-1, air suction port, 1-2, air filter, 1-3, screw compressor, 1-4, oil-gas mixing pipe, 1-5, oil-gas separator, 1-6, temperature control valve, 1-7, oil cooler return oil pipe, 1-8, oil cooler oil supply pipe, 1-9, oil cooler, 1-10, oil supply main pipe, 1-11, exhaust pipe, 1-12, air cooler, 1-13, compressed air supply pipe, 1-14, cooling fan;

[0037] 2-1, primary side of heat exchanger, 2-2, secondary side of heat exchanger;

[0038] 16-1, serpentine heating pipe, 16-2, protection plate, 16-3, water tank inner wall, 16-4, decorative plate, 16-5, wall protection plate, 16-6, water baffle, 16-7, water tank outer wall. DETAILED DESCRIPTION

[0039] The technical solutions provided by the present application will be further described below in combination with specific embodiments and their drawings. The advantages and features of the present application will be more apparent in combination with the following description.

[0040] As Figure 1As shown, a kind of air compressor heat recovery hot water system, including air compressor system 1, heat recovery device, hot water application system;The heat recovery device includes heat recovery unit 2 and heat preservation water tank 5, the main components inside the heat recovery unit 2 are heat exchanger, the heat exchanger primary side 2-1 of heat recovery unit 2 is connected with air compressor system by pipeline, the heat exchanger secondary side 2-2 of heat recovery unit is connected with heat preservation water tank 5 by pipeline, heat preservation water tank 5 is connected with hot water application system by pipeline;The heat recovery device is used to absorb the waste heat of air compressor system 1 and provide hot water using waste heat for hot water application system.

[0041] Specifically, the air compressor system 1 includes air suction inlet 1-1, air filter 1-2, screw compressor 1-3, oil-gas mixing pipe 1-4, oil-gas separator 1-5, temperature control valve 1-6, oil cooler return oil pipe 1-7, oil cooler oil supply pipe 1-8, oil cooler 1-9, oil supply main pipe 1-10, exhaust pipe 1-11, air cooler 1-12, compressed air supply pipe 1-13, cooling fan 1-14, wherein:

[0042] The air filter 1-2 is connected with the air suction inlet 1-1 at the inlet, and is connected with the screw compressor 1-3 by pipeline at the outlet;

[0043] The screw compressor 1-3 is connected with the oil-gas separator 1-5 through the oil-gas mixing pipe 1-4;

[0044] The top of the oil-gas separator 1-5 is provided with an air outlet, the air outlet is connected with the inlet of the air cooler 1-12 through the exhaust pipe 1-11, and the outlet of the air cooler 1-12 is connected to the end user through the compressed air supply pipe 1-13;

[0045] The lower part of the oil-gas separator 1-5 is provided with a lubricating oil outlet, the lubricating oil outlet is transported to the heat exchanger primary side inlet of the heat recovery unit 2 of the heat recovery device through the oil return pipeline 3, the heat exchanger primary side outlet of the heat recovery unit 2 of the heat recovery device is connected to the inlet of the oil cooler 1-9 in sequence through the oil supply pipeline 4, the temperature control valve 1-6 and the oil cooler return oil pipe 1-7, the outlet of the oil cooler 1-9 is connected to the oil tank of the screw compressor 1-3 in sequence through the oil cooler oil supply pipe 1-8, the temperature control valve 1-6 and the oil supply main pipe 1-10; The temperature control valve 1-6 is connected with the oil supply pipeline 4, the oil cooler return oil pipe 1-7, the oil cooler oil supply pipe 1-8 and the oil supply main pipe 1-10, for detecting the temperature of the lubricating oil and controlling the further cooling treatment of the oil temperature.

[0046] Specifically, the heat recovery device, the heat exchanger primary side loop of the heat recovery unit 2 is a lubricating oil passage, and the lubricating oil flows inside; The heat exchanger secondary side loop is a water passage, and water flows inside;

[0047] The outlet of the secondary side of the heat exchanger of the heat recovery unit 2 is connected to the inlet of the upper part of the heat preservation water tank 5 through the water supply pipeline 10; the inlet of the secondary side of the heat exchanger of the heat recovery unit 2 is connected to the outlet of the lower part of the heat preservation water tank 5 through the backwater pipeline 9;

[0048] The heat recovery device further comprises a heat recovery circulating water pump 8 and a temperature controller 7; the heat recovery circulating water pump 8 is arranged on the backwater pipeline 9; the temperature controller 7 is connected to the heat preservation water tank 5 and is electrically connected to the heat recovery circulating water pump 8; the temperature controller 7 is used for monitoring the temperature of the heat preservation water tank 5 and controlling the start and stop of the heat recovery circulating water pump 8;

[0049] The heat recovery device further comprises a water replenishment electromagnetic valve 12 and a liquid level controller 6; the top of the heat preservation water tank 5 is provided with a tap water inlet connected to tap water through a tap water replenishment pipeline 11; the water replenishment electromagnetic valve 12 is arranged on the tap water replenishment pipeline 11; the liquid level controller 6 is connected to the heat preservation water tank 5 and is electrically connected to the water replenishment electromagnetic valve 12; the liquid level controller 6 is used for monitoring the liquid level of the heat preservation water tank 5 and controlling the water replenishment electromagnetic valve 12 to inject tap water into the heat preservation water tank 5.

[0050] Specifically, the hot water application system applies the hot water generated by the waste heat recovered by the heat recovery device to process flow water heating or uses it as domestic hot water. The hot water application system comprises a hot water supply main pipe 24, a hot water supply pump 23, a water pump frequency conversion controller 13 with a water supply pressure sensor, a process water branch and a domestic water branch, and a hot water backwater main pipe 14, wherein:

[0051] The hot water supply main pipe 24 is connected to the outlet of the bottom of the heat preservation water tank 5; as an embodiment, the bottom of the heat preservation water tank 5 can be provided with multiple outlets, and the outlet connected by the hot water supply main pipe 24 and the outlet connected by the backwater pipeline 9 are different outlets on the two sides of the heat preservation water tank 5;

[0052] The hot water supply pump 23 and the water pump frequency conversion controller 13 with a water supply pressure sensor are arranged on the hot water supply main pipe 24, and the hot water supply pump 23 is electrically connected to the water pump frequency conversion controller 13 with a water supply pressure sensor;

[0053] The process water branch and the domestic water branch are two hot water branches and are connected in parallel between the hot water supply main pipe 24 and the hot water backwater main pipe 14.

[0054] In the embodiment, the process water branch is used for heating a workshop cleaning process tank, and the domestic water branch is used for providing hot water for kitchens, toilets and the like, specifically:

[0055] The process water branch includes a process cleaning water tank supply branch pipe 21, a process cleaning water tank 16, a process cleaning water tank return branch pipe 22, a temperature control solenoid valve 17, and a temperature controller 18 with a temperature sensor. The process cleaning water tank 16 is connected to the hot water supply main pipe 24 through the process cleaning water tank supply branch pipe 21 and to the hot water return main pipe 14 through the process cleaning water tank return branch pipe 22. The temperature control solenoid valve 17 is installed on the process cleaning water tank return branch pipe 22, and the temperature controller 18 with a temperature sensor is installed on the lower part of the outer wall of the process cleaning water tank 16, and the temperature control solenoid valve 17 and the temperature controller 18 with a temperature sensor are electrically connected.

[0056] The domestic water branch includes a domestic water supply branch pipe 19, several domestic hot water taps 15, and a domestic return water branch pipe 20; the domestic hot water taps 15 are connected to the hot water supply main pipe 24 through the domestic water supply branch pipe 19, and are connected to the hot water return main pipe 14 through the domestic return water branch pipe 20.

[0057] Furthermore, such as Figures 2 to 5 As shown, the process cleaning water tank 16 consists of an inner wall 16-3 and a bottom forming a water storage space. A serpentine heating pipe 16-1 is installed at the bottom of the tank. The inlet of the serpentine heating pipe 16-1 is connected to the water supply branch pipe 21 of the process cleaning water tank, and its outlet is connected to the water return branch pipe 22 of the process cleaning water tank. A protective plate 16-2 is installed above the serpentine heating pipe 16-1. The protective plate 16-2 is used to protect the serpentine heating pipe 16-1 so that it is not damaged during the cleaning operation. The protective plate 16-2 is easy to disassemble, making it convenient to clean the bottom of the water tank when removed.

[0058] Furthermore, a decorative panel 16-4 is installed at the bottom of the outer wall 16-7 of the process cleaning water tank 16 for aesthetic purposes.

[0059] Furthermore, the process cleaning water tank 16 is set against the wall, and a wall panel 16-5 is installed on the top of the outer wall 16-7 of the water tank adjacent to the wall to prevent sewage from splashing onto the wall during the cleaning operation.

[0060] Furthermore, baffles 16-6 are installed on both sides of the outer wall 16-7 of the process cleaning water tank 16 to prevent sewage from splashing onto the ground on both sides of the water tank during the cleaning operation.

[0061] Preferably, the outer wall of the pool has 16-7 corners with a smooth arc.

[0062] Specifically, the working process of the air compressor system is as follows:

[0063] Air enters from air suction port 1-1, is filtered by air filter 1-2, and becomes high-pressure and high-temperature oil-gas mixture after being compressed by screw compressor 1-3. The high-pressure and high-temperature oil-gas mixture enters oil-gas separator 1-5 through oil-gas mixing pipe 1-4 and is separated. The high-temperature and high-pressure air is discharged from the top outlet of oil-gas separator 1-5 and enters air cooler 1-12 to exchange heat with air. After heat exchange, the high-pressure air temperature is reduced, and the high-pressure air is transported to the end user through compressed air supply pipe 1-13. The high-temperature lubricating oil is discharged from the lower outlet of oil-gas separator 1-5 and transported to heat recovery unit 2 through oil return pipe 3. The lubricating oil exchanges heat with low-temperature water from heat recovery unit 2 through heat exchanger primary side 2-1 and heat exchanger secondary side 2-2. After heat exchange, the temperature of the lubricating oil is reduced, and the lubricating oil is transported to temperature control valve 1-6 through oil supply pipe 4.

[0064] Temperature control valve 1-6 judges the temperature of the lubricating oil. When the temperature of the lubricating oil is less than or equal to the set value, the lubricating oil returns to the oil tank of screw compressor 1-3 through oil supply main pipe 1-10. When the temperature of the lubricating oil is higher than the set value, the lubricating oil enters oil cooler 1-9 through oil cooler return pipe 1-7 to exchange heat with air. The temperature of the lubricating oil is further reduced by oil cooler 1-9, and the lubricating oil returns to the oil tank of screw compressor 1-3 through oil cooler oil supply pipe 1-8 and oil supply main pipe 1-10.

[0065] Specifically, the heat recovery device recovers the waste heat of the air compressor. The heat recovery circulating water pump 8 installed on the water return pipe 9 pressurizes the low-temperature water in the heat preservation water tank 5 and transports the low-temperature water to the heat recovery unit 2. The low-temperature water exchanges heat with the high-temperature lubricating oil from the air compressor system in the heat exchanger primary side circuit 2-1 and the heat exchanger secondary side circuit 2-2. The low-temperature water becomes high-temperature water and returns to the heat preservation water tank 5 through the water supply pipe 10, completing the water heating and circulation process in the water tank.

[0066] Further, the temperature controller 7 controls the start and stop of the heat recovery circulating water pump 8. The temperature controller 7 sets the temperature of the hot water (as an example, the temperature is 55℃) and the water temperature control accuracy (as an example, the accuracy is ±5℃). The temperature controller monitors the water temperature in the heat preservation water tank 5. When the water temperature is lower than 50℃, the heat recovery circulating water pump 8 operates to heat the heat preservation water tank. When the water temperature is higher than 60℃, the heat recovery circulating water pump 8 stops operating.

[0067] Further, the liquid level controller 6 controls the water replenishment electromagnetic valve 12. The liquid level controller 6 has a medium water level, a high water level and a low water level. When the actual liquid level of the heat preservation water tank 5 is lower than the medium water level of the liquid level controller 6, the water replenishment electromagnetic valve 12 is opened to replenish water for the heat preservation water tank 5. When the actual liquid level reaches the high water level, the water replenishment is stopped. The low water level is a protection level. When the actual liquid level is lower than the low water level, the heat recovery circulating water pump 8 and the hot water pump 23 stop operating.

[0068] Specifically, the hot water application system, the hot water supply pump 23 on the hot water supply main pipe 24 pressurizes the hot water from the heat preservation water tank 5, part of the hot water is delivered to the hot water cock 15 through the life water supply branch pipe 19 to provide hot water for the kitchen, bathroom and the like; part of the hot water is delivered to the serpentine heating pipe 16-1 of the process cleaning tank 16 through the cleaning tank water supply branch pipe 21, and the hot water flows in the serpentine heating pipe 16-1, exchanges heat with the cold water at the bottom of the process cleaning tank 16, heats the cold water in the process cleaning tank 16, and the water temperature rises to the set temperature.

[0069] Further, the frequency conversion control of the hot water supply pump 23: the controller 13 installed in the hot water supply main pipe 24 sets a pressure value such as 0.3 MPa, when the actual pressure is lower than the set pressure value, the controller outputs a signal to increase the rotating speed of the hot water supply pump 23, so as to increase the water supply amount and make the pressure rise; on the contrary, when the actual pressure is higher than the set pressure value, the controller reduces the rotating speed of the hot water supply pump 23, so as to reduce the water supply amount and make the pressure drop.

[0070] Further, the water temperature control of the process cleaning tank 16: the temperature control electromagnetic valve 17 is controlled by the temperature controller 18 with a temperature sensor, the water temperature (such as 35℃) in the process cleaning tank 16 and the water temperature control precision (such as ±5℃) are set on the temperature controller 18, the temperature controller 18 monitors the water temperature of the process cleaning tank 16, when the water temperature is lower than 30℃, the temperature control electromagnetic valve 17 is opened, the hot water flows in the serpentine heating pipe 16-1, exchanges heat with the cold water at the bottom of the process cleaning tank 16, heats the cold water in the process cleaning tank 16, and when the water temperature in the tank rises to 40℃, the temperature control electromagnetic valve 17 is closed to stop heating the process cleaning tank 16, so as to realize the heating and temperature preservation process of the process cleaning tank 16.

[0071] Innovations and advantages of the present application:

[0072] 1) After the heat recovery device is installed on the air compressor system, the heat energy generated in the compression process of the air compressor is recycled, and the energy utilization efficiency is further improved. The waste heat of the air compressor is converted into hot water, which is used for heating the water in the process cleaning tank and the hot water in the kitchen, bathroom and the like, instead of original electric heating, saving electric energy consumption and operation cost.

[0073] 2) The waste heat of the air compressor in the process is recycled, so that the energy consumption and related carbon dioxide emission are greatly saved.

[0074] 3) The air compressor of the application has better heat dissipation effect, can operate in the best working condition of oil temperature 70-85 DEG C, effectively avoids the internal carbon deposition and lock of the air compressor oil caused by too high temperature, thereby improves the gas production efficiency of the air compressor and prolongs the service life of the equipment. When the oil temperature of the air compressor is 70-85 DEG C, the heat recovery hot water temperature is 50-60 DEG C.

[0075] The above description is only a description of the preferred embodiments of the application, and is not any limitation on the scope of the application. Any modification or modification made by any person skilled in the art according to the above disclosed technical content should be regarded as an equivalent effective embodiment, and belongs to the protection scope of the technical scheme of the application.

Claims

1. An air compressor heat recovery hot water system, characterized by, The application relates to a heat recovery device for air compressor system, which comprises an air compressor system (1), a heat recovery device and a hot water application system; the heat recovery device comprises a heat recovery unit (2) and a heat preservation water tank (5); the heat recovery unit (2) comprises a heat exchanger; the heat exchanger primary side (2-1) of the heat recovery unit (2) is connected with the air compressor system through a pipeline; the heat exchanger secondary side (2-2) of the heat recovery unit is connected with the heat preservation water tank (5) through a pipeline; the heat preservation water tank (5) is connected with the hot water application system through a pipeline; the heat recovery device is used for absorbing the waste heat of the air compressor system (1) and providing hot water for the hot water application system. The air compressor system (1) comprises an air suction inlet (1-1), an air filter (1-2), a screw compressor (1-3), an oil-gas mixing pipe (1-4), an oil-gas separator (1-5), a temperature control valve (1-6), an oil cooler return oil pipe (1-7), an oil cooler oil supply pipe (1-8), an oil cooler (1-9), an oil supply main pipe (1-10), an exhaust pipe (1-11), an air cooler (1-12), a compressed air supply pipe (1-13) and a cooling fan (1-14), wherein: The air filter (1-2) is connected with the air suction inlet (1-1) at the inlet and connected with the screw compressor (1-3) at the outlet through a pipeline; The screw compressor (1-3) is connected with the oil-gas separator (1-5) through the oil-gas mixing pipe (1-4); The top of the oil-gas separator (1-5) is provided with an air outlet, the air outlet is connected with the air cooler (1-12) inlet through the exhaust pipe (1-11), and the air cooler (1-12) outlet is connected to the end user through the compressed air supply pipe (1-13); The lower part of the oil-gas separator (1-5) is provided with a lubricating oil outlet, the lubricating oil outlet is transported to the heat recovery unit (2) heat exchanger primary side inlet of the heat recovery device through the oil return pipeline (3), the heat recovery unit (2) heat exchanger primary side outlet of the heat recovery device is sequentially connected to the inlet of the oil cooler (1-9) through the oil supply pipeline (4), the temperature control valve (1-6) and the oil cooler return oil pipe (1-7), the outlet of the oil cooler (1-9) is sequentially connected to the oil tank of the screw compressor (1-3) through the oil cooler oil supply pipe (1-8), the temperature control valve (1-6) and the oil supply main pipe (1-10); the temperature control valve (1-6) is connected with the oil supply pipeline (4), the oil cooler return oil pipe (1-7), the oil cooler oil supply pipe (1-8) and the oil supply main pipe (1-10).

2. The air compressor heat recovery hot water system of claim 1, wherein, The heat recovery device, the heat recovery unit (2) heat exchanger primary side loop is a lubricating oil passage, and lubricating oil flows in the inside; the heat exchanger secondary side loop is a water passage, and water flows in the inside; The heat recovery unit (2) heat exchanger secondary side outlet is connected to the inlet of the upper part of the heat preservation water tank (5) through the water supply pipeline (10); the heat recovery unit (2) heat exchanger secondary side inlet is connected with the outlet of the lower part of the heat preservation water tank (5) through the water return pipeline (9). The heat recovery device further comprises a heat recovery circulating water pump (8) and a temperature controller (7); the heat recovery circulating water pump (8) is arranged on a return water pipeline (9); the temperature controller (7) is connected with the heat preservation water tank (5) and is electrically connected with the heat recovery circulating water pump (8); The heat recovery device further comprises a water replenishing electromagnetic valve (12) and a liquid level controller (6); the top of the heat preservation water tank (5) is provided with a tap water inlet, the tap water is connected through a tap water replenishing pipeline (11), the water replenishing electromagnetic valve (12) is arranged on the tap water replenishing pipeline (11); the liquid level controller (6) is connected with the heat preservation water tank (5) and is electrically connected with the water replenishing electromagnetic valve (12).

3. The air compressor heat recovery hot water system of claim 1, wherein, The hot water application system applies the hot water generated by the waste heat recovered by the heat recovery device to process flow water heating or uses the hot water as domestic hot water; the hot water application system comprises a hot water supply main pipe (24), a hot water supply pump (23), a water pump frequency conversion controller (13) provided with a water supply pressure sensor, a process water branch and a domestic water branch, and a hot water return main pipe (14), wherein: The hot water supply main pipe (24) is connected to the outlet at the bottom of the heat preservation water tank (5); The hot water supply pump (23) and the water pump frequency conversion controller (13) provided with a water supply pressure sensor are arranged on the hot water supply main pipe (24), and the hot water supply pump (23) is electrically connected with the water pump frequency conversion controller (13) provided with a water supply pressure sensor; The process water branch and the domestic water branch are two hot water water branches and are connected in parallel between the hot water supply main pipe (24) and the hot water return main pipe (14).

4. The air compressor heat recovery hot water system of claim 3, wherein, The process water branch comprises a process cleaning water tank water supply branch pipe (21), a process cleaning water tank (16), a process cleaning water tank return water branch pipe (22), a temperature control electromagnetic valve (17) and a temperature control device (18) provided with a temperature sensor; The process cleaning water tank (16) is connected with the hot water supply main pipe (24) through the process cleaning water tank water supply branch pipe (21) and is connected with the hot water return main pipe (14) through the process cleaning water tank return water branch pipe (22); The temperature control electromagnetic valve (17) is installed on the process cleaning water tank return water branch pipe (22), the temperature control device (18) provided with a temperature sensor is installed on the lower part of the outer wall of the process cleaning water tank (16), and the temperature control electromagnetic valve (17) and the temperature control device (18) provided with a temperature sensor are electrically connected.

5. The air compressor heat recovery hot water system of claim 4, wherein, The process cleaning water tank (16) comprises a water tank inner wall (16-3) and a water tank bottom part to form a water storage space, and the water tank bottom part is provided with a serpentine heating pipe (16-1); the inlet of the serpentine heating pipe (16-1) is connected with the process cleaning water tank water supply branch pipe (21), the outlet of the serpentine heating pipe (16-1) is connected with the process cleaning water tank return water branch pipe (22), and a protection plate (16-2) is installed above the serpentine heating pipe (16-1).

6. The air compressor heat recovery hot water system of claim 3, wherein, The domestic water branch comprises a domestic water supply branch pipe (19), a plurality of domestic hot water taps (15), and a domestic water return branch pipe (20); the domestic hot water tap (15) is connected with the hot water supply main pipe (24) through the domestic water supply branch pipe (19) and connected with the hot water return main pipe (14) through the domestic water return branch pipe (20).

Images