Device for utilizing waste heat of screw air compressor

Abstract

The utility model relates to a device for utilizing waste heat of a screw air compressor, and relates to the technical field of waste heat recovery of air compressors. A heat utilization system of a screw air compressor comprises a heat exchange system, a heat supply system and a controller. By arranging the heat exchange system, heat exchange can be conducted between deionized water in the heat exchange water tank and high-temperature cooling oil of the screw type air compressor, oil-water heat exchange circulation between the screw type air compressor and the heat exchange water tank is formed, the deionized water circulates in a closed pipeline, frequent water supplementing is not needed, meanwhile, scaling can be effectively restrained, and the service life of the screw type air compressor is prolonged. The condition of leakage of cooling oil of the air compressor is avoided, and normal use of the heat exchanger of the air compressor is guaranteed; by arranging the heat supply system, water-water heat exchange circulation between the heat exchange water tank and the heat supply water tank can be formed, water in the heat supply water tank is heated, the requirement for external daily hot water is met, and effective recycling of waste heat of the air compressor is achieved.

Description

Technical Field

[0001] This application relates to the field of waste heat recovery technology for air compressors, and more particularly to a device for utilizing waste heat from a screw air compressor. Background Technology

[0002] In mining operations, screw air compressors are widely used as key power equipment. They are driven by electricity to deliver compressed air to the underground working face, providing power support for equipment such as rock drills and pneumatic picks.

[0003] During operation, screw air compressors generate a large amount of heat, causing the equipment to operate in a high-temperature environment for extended periods. This not only exacerbates the heat load on equipment within the plant and increases the risk of equipment failure and damage, but also threatens the safety of inspection and maintenance personnel, resulting in significant heat hazards.

[0004] Existing waste heat recovery systems for air compressors often consist of a single heat exchange between the air compressor lubricating oil and the customer's water: the water to be heated is delivered into the water tank, the heat transfer circulation pump is controlled to work, the process water is pressurized by the heat transfer circulation pump and then sent to the air compressor oil-water heat exchange module for heating, and then returned to the insulated water tank after heating.

[0005] Due to issues such as corrosion of air compressor lubricating oil, brazed heat exchangers are typically used in air compressor waste heat recovery systems. However, brazed plate heat exchangers are prone to scaling during use, which can lead to air compressor cooling oil leaks. This can cause the air compressor cooling oil to enter the water system, resulting in water pollution and posing a significant safety hazard. Utility Model Content

[0006] To address or partially address the problems existing in related technologies, this application provides a system for heat utilization of screw air compressors, which can effectively inhibit scaling, prevent air compressor cooling oil leakage, and achieve effective recovery and utilization of waste heat from the air compressor.

[0007] This application provides a system for heat utilization of a screw air compressor, the system comprising: a heat exchange system, a heating system, and a controller;

[0008] The heat exchange system includes a first circulation pump and a hot water tank. The two ends of the first circulation pump are connected to the heat exchanger of the screw air compressor and the hot water tank through pipes, respectively, to form an oil-water heat exchange cycle between the screw air compressor and the hot water tank. The liquid in the hot water tank is deionized water.

[0009] The heating system includes a heat exchanger, a second circulation pump, and a hot water tank. The two ends of the heat exchanger are connected to the hot water tank and the second circulation pump through pipes, respectively. The other end of the second circulation pump is connected to the hot water tank through a pipe, forming a water-to-water heat exchange cycle between the hot water tank and the hot water tank. The hot water tank is connected to the external daily water pipe through a pipe.

[0010] The controller is directly electrically connected to the first circulating pump, the heating heat exchanger, and the second circulating pump.

[0011] Optionally, in some embodiments of this application:

[0012] A filter is installed on the pipe connecting the heat exchange outlet of the hot water tank to the second circulation pump.

[0013] The filter is a Y-type filter with a drain pipe.

[0014] Optionally, in some embodiments of this application:

[0015] The hot water tank is equipped with a variable frequency heat pump unit on the pipe that connects the heat exchange inlet to the second circulation pump.

[0016] A temperature sensor is installed in the hot water tank.

[0017] The controller is directly electrically connected to the variable frequency heat pump unit and the temperature sensor.

[0018] Optionally, in some embodiments of this application:

[0019] Heat exchange solenoid valves are installed on each pipeline connecting the first circulating pump and the screw air compressor.

[0020] Heating solenoid valves are installed on each pipe connecting the second circulation pump and the hot water tank.

[0021] The controller establishes direct electrical connections with each heat exchange solenoid valve and heating solenoid valve.

[0022] Optionally, in some embodiments of this application:

[0023] The hot water tank is connected to the external daily water pipe by an inlet solenoid valve.

[0024] The hot water tank is equipped with a solenoid valve for water outlet.

[0025] The controller establishes direct electrical connections with each inlet solenoid valve and outlet solenoid valve.

[0026] The technical solution provided in this application may include the following beneficial effects:

[0027] This application, by setting up a heat exchange system, enables heat exchange between deionized water in the hot water tank and the high-temperature cooling oil of the screw air compressor, forming an oil-water heat exchange cycle between the screw air compressor and the hot water tank. The deionized water circulates in a closed pipeline, eliminating the need for frequent water replenishment and effectively inhibiting scaling, preventing air compressor cooling oil leakage, and ensuring the normal operation of the air compressor heat exchanger. By setting up a heating system, a water-water heat exchange cycle is formed between the hot water tank and the hot water supply tank, heating the water in the hot water supply tank to meet the external daily hot water needs and achieving effective recovery and utilization of waste heat from the air compressor.

[0028] This application, by setting up a Y-type filter, can reduce impurities in the external water supply, reduce the risk of scaling in the heating heat exchanger, lower maintenance costs, and ensure normal water use.

[0029] In this application, the controller controls the variable frequency heat pump unit, which can adjust the water flow rate of the hot water tank according to the detection results of the temperature sensor. When the temperature reaches the set temperature, the hot water tank is replenished with water to cool down, and the variable frequency heat pump unit stops at the same time, so as to further ensure the demand for hot water for daily use outside.

[0030] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0031] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0032] Figure 1 This is a schematic diagram of a screw air compressor heat utilization system in an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of a control structure of the controller in an embodiment of this application.

[0034] Reference numerals in the attached diagram: 1-Screw air compressor, 2-First circulation pump, 201-Heat exchange solenoid valve, 3-Hot water tank, 4-Heating heat exchanger, 5-Second circulation pump, 501-Heating solenoid valve, 6-Hot water tank, 601-Inlet solenoid valve, 602-Outlet solenoid valve, 7-Filter, 8-Variable frequency heat pump unit, 9-Temperature sensor, 10-Controller. Detailed Implementation

[0035] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0036] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0037] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] Existing waste heat recovery systems for air compressors often consist of a single heat exchange between the air compressor lubricating oil and the customer's water: the water to be heated is delivered into the water tank, the heat transfer circulation pump is controlled to work, the process water is pressurized by the heat transfer circulation pump and then sent to the air compressor oil-water heat exchange module for heating, and then returned to the insulated water tank after heating.

[0040] Due to issues such as corrosion of air compressor lubricating oil, brazed heat exchangers are typically used in air compressor waste heat recovery systems. However, brazed plate heat exchangers are prone to scaling during use, which can lead to air compressor cooling oil leaks. This can cause the air compressor cooling oil to enter the water system, resulting in water pollution and posing a significant safety hazard.

[0041] To address the aforementioned issues, this application provides a system for the heat utilization of a screw air compressor, which can effectively inhibit scaling, prevent air compressor cooling oil leakage, and achieve effective recovery and utilization of waste heat from the air compressor.

[0042] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0043] Figure 1 This is a schematic diagram of a screw air compressor heat utilization system in an embodiment of this application;

[0044] Figure 2 This is a schematic diagram of a control structure of the controller in an embodiment of this application.

[0045] See Figure 1 A system for heat utilization of a screw air compressor, comprising: a heat exchange system, a heating system, and a controller.

[0046] The heat exchange system includes a first circulation pump 2 and a hot water tank 3. The two ends of the first circulation pump 2 are connected to the heat exchanger of the screw air compressor 1 and the hot water tank 3 respectively through pipes, forming an oil-water heat exchange cycle between the screw air compressor 1 and the hot water tank 3. The liquid in the hot water tank 3 is deionized water.

[0047] The heating system includes a heat exchanger 4, a second circulation pump 5, and a hot water tank 6. The two ends of the heat exchanger 4 are connected to the hot water tank 3 and the second circulation pump 5 respectively through pipes. The other end of the second circulation pump 5 is connected to the hot water tank 6 through a pipe, forming a water-to-water heat exchange cycle between the hot water tank 3 and the hot water tank 6. The hot water tank 6 is connected to the external daily water pipe through a pipe.

[0048] The controller 10 is directly electrically connected to the first circulating pump 2, the heat exchanger 4, and the second circulating pump 5. The controller 10 is a PLC controller 10, which is used for unified control.

[0049] In this embodiment, by setting up a heat exchange system, heat exchange can be carried out between the deionized water in the hot water tank 3 and the high-temperature cooling oil of the screw air compressor 1, forming an oil-water heat exchange cycle between the screw air compressor 1 and the hot water tank 3. The deionized water circulates in a closed pipeline, eliminating the need for frequent water replenishment, and effectively inhibiting scaling and air compressor cooling oil leakage, thus ensuring the normal operation of the air compressor heat exchanger. By setting up a heating system, a water-water heat exchange cycle can be formed between the hot water tank 3 and the hot water supply tank 6, heating the water in the hot water supply tank 6 to meet the external daily hot water needs and achieve effective recovery and utilization of the waste heat from the air compressor.

[0050] Specifically, a filter 7 is installed on the pipe connecting the heat exchange outlet of the hot water tank 6 to the second circulation pump 5; the filter 7 is a Y-type filter with a drain pipe.

[0051] In this embodiment, by setting a Y-type filter 7, impurities in the external water supply can be reduced, the risk of scaling in the heating heat exchanger 4 can be reduced, maintenance costs can be lowered, and normal water use can be guaranteed.

[0052] Specifically, a variable frequency heat pump unit 8 is installed on the pipe connecting the heat exchange inlet of the hot water tank 6 to the second circulation pump 5; a temperature sensor 9 is installed in the hot water tank 6; and the controller 10 is directly electrically connected to the variable frequency heat pump unit 8 and the temperature sensor 9.

[0053] In this embodiment, the controller 10 controls the variable frequency heat pump group 8, which can adjust the water flow rate of the hot water tank 6 according to the detection result of the temperature sensor 9. When the temperature reaches the set temperature, the hot water tank is replenished with water to cool down, and the variable frequency heat pump group 8 stops, further ensuring the demand for hot water for daily use.

[0054] Specifically, each pipe connecting the first circulating pump 2 and the screw air compressor 1 is equipped with a heat exchange solenoid valve 201; each pipe connecting the second circulating pump 5 and the hot water tank 6 is equipped with a heating solenoid valve 501; and the controller 10 is directly electrically connected to each heat exchange solenoid valve 201 and heating solenoid valve 501.

[0055] In this embodiment, the controller 10 automatically controls the opening and stopping of the heat exchange solenoid valve 201 and the heating solenoid valve 501 according to the operating status of the air compressor and the temperature of the hot water tank 6, so as to ensure the normal operation of the heat exchange system.

[0056] Specifically, a water inlet solenoid valve 601 is installed on the pipe that connects the hot water tank 6 to the external daily water pipe;

[0057] The hot water tank 6 is equipped with an outlet solenoid valve 602 on its outlet pipe; the controller 10 is directly electrically connected to each inlet solenoid valve 601 and outlet solenoid valve 602.

[0058] In this embodiment, the controller 10 controls the water inlet solenoid valve 601 to replenish water according to the water usage. At the same time, when maintenance is required, the controller 10 ensures normal maintenance work by cutting off the water outlet solenoid valve 602.

[0059] The technical solutions provided in this application have the following beneficial effects:

[0060] This application, by setting up a heat exchange system, enables heat exchange between the deionized water in the hot water tank 3 and the high-temperature cooling oil of the screw air compressor 1, forming an oil-water heat exchange cycle between the screw air compressor 1 and the hot water tank 3. The deionized water circulates in a closed pipeline, eliminating the need for frequent water replenishment and effectively inhibiting scaling, preventing air compressor cooling oil leakage, and ensuring the normal operation of the air compressor heat exchanger. By setting up a heating system, a water-water heat exchange cycle can be formed between the hot water tank 3 and the hot water supply tank 6, heating the water in the hot water supply tank 6 to meet the external daily hot water needs and achieving effective recovery and utilization of waste heat from the air compressor.

[0061] This application, by setting a Y-type filter 7, can reduce impurities in the external water supply, reduce the risk of scaling in the heating heat exchanger 4, lower maintenance costs, and ensure normal water use.

[0062] In this application, the controller 10 controls the variable frequency heat pump group 8, which can adjust the water flow rate of the hot water tank 6 according to the detection result of the temperature sensor 9. When the temperature reaches the set temperature, the hot water tank is replenished with water to cool down, and the variable frequency heat pump group 8 stops, further ensuring the demand for hot water for daily use.

[0063] Finally, it should be noted that in this document, relationships such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "include," "contain," or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0064] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0065] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0066] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A device for utilizing waste heat of a screw air compressor, characterized by comprising: a screw air compressor; a heat exchanger; a heat pipe; and a heat sink. The device comprises a heat exchange system, a heat supply system and a controller (10); The heat exchange system comprises a first circulating pump (2) and a heat exchange water tank (3), two ends of the first circulating pump (2) are connected with a heat exchanger of a screw air compressor (1) and the heat exchange water tank (3) through pipelines respectively, forming an oil-water heat exchange circulation between the screw air compressor (1) and the heat exchange water tank (3), wherein the liquid in the heat exchange water tank (3) is deionized water; The heat supply system comprises a heat supply heat exchanger (4), a second circulating pump (5) and a heat supply water tank (6), two ends of the heat supply heat exchanger (4) are connected with the heat exchange water tank (3) and the second circulating pump (5) through pipelines respectively, the other end of the second circulating pump (5) is connected with the heat supply water tank (6) through a pipeline, forming a water-water heat exchange circulation between the heat exchange water tank (3) and the heat supply water tank (6), wherein the heat supply water tank (6) is connected with an external daily water pipe through a pipeline; The controller (10) is directly electrically connected with the first circulating pump (2), the heat supply heat exchanger (4) and the second circulating pump (5) respectively.

2. The device for utilizing the waste heat of the screw air compressor according to claim 1, wherein: A filter (7) is arranged on the pipeline through which the heat exchange outlet end of the heat supply water tank (6) is connected with the second circulating pump (5); The filter (7) is a Y-shaped filter (7) with a blowdown pipe.

3. The device for utilizing the waste heat of the screw air compressor according to claim 2, wherein: A variable frequency heat pump group (8) is arranged on the pipeline through which the heat exchange inlet end of the heat supply water tank (6) is connected with the second circulating pump (5); A temperature sensor (9) is arranged in the heat supply water tank (6); The controller (10) is directly electrically connected with the variable frequency heat pump group (8) and the temperature sensor (9) respectively.

4. The device for utilizing the waste heat of the screw air compressor according to claim 3, wherein: Heat exchange electromagnetic valves (201) are arranged on the pipelines through which the first circulating pump (2) is connected with the screw air compressor (1) respectively; Heat supply electromagnetic valves (501) are arranged on the pipelines through which the second circulating pump (5) is connected with the heat supply water tank (6) respectively; The controller (10) is directly electrically connected with the heat exchange electromagnetic valves (201) and the heat supply electromagnetic valves (501) respectively.

5. The device for utilizing the waste heat of the screw air compressor according to claim 4, wherein: An inlet water electromagnetic valve (601) is arranged on the pipeline through which the heat supply water tank (6) is connected with the external daily water pipe; An outlet water electromagnetic valve (602) is arranged on the outlet pipeline of the heat supply water tank (6); The controller (10) is directly electrically connected with the inlet water electromagnetic valve (601) and the outlet water electromagnetic valve (602) respectively.

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