Inlet air preheating and temperature adjusting system suitable for compressor unit

Abstract

The utility model provides an air inlet preheating and temperature adjusting system suitable for a compressor unit, which comprises a main preheating device and an auxiliary preheating device, the main preheating device comprises a first heat exchanger arranged at the tail-section compressor, a preheater arranged at the head-section compressor, a preheating pipeline connected with the first heat exchanger and the preheater and forming a closed loop, a heat-conducting medium filled in the preheating pipeline, and a first circulating pump connected to the preheating pipeline; and the auxiliary preheating device is connected into the first-section gas inlet pipeline. The air inlet temperature of the first-section compressor can be increased through the main preheating device, meanwhile, when the main preheating device does not completely preheat the air inlet temperature in the first-section air inlet pipeline, the air inlet temperature in the first-section air inlet pipeline is increased through the auxiliary preheating device, the preheating time is shortened, it can also be guaranteed that the temperature is constant in an auxiliary mode, and in the low-temperature environment in winter, the preheating time is shortened. The air inlet temperature of the compressor is kept consistent with the design temperature, so that the operation reliability of the compressor unit is improved, and the efficiency of the compressor unit in the low-temperature environment is improved.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and more specifically, to an intake preheating and temperature control system suitable for compressor units. Background Technology

[0002] A compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas, and it is used in many fields. During compression, the air temperature rises with the increase in pressure. The compressor discharge temperature is directly related to the pressure ratio (the ratio of discharge pressure to intake pressure); the higher the pressure ratio, the higher the discharge temperature. To control the discharge temperature and improve the efficiency of the compression process, multiple compressors are usually connected in series to compress air, forming a compressor unit. A heat exchange system cools the compressor stages, reducing the high-temperature exhaust gas to a low temperature before it enters the next compressor stage or other gas-using equipment, or it is stored in a gas storage device. Simultaneously, the heat in the high-temperature exhaust gas is stored using a heat storage medium.

[0003] However, a major drawback of existing technology is that conventional compressors do not perform well in low-temperature environments. The discharge temperature of the first-stage compressor is directly related to the ambient temperature. Under the premise of constant pressure ratio, the discharge temperature of subsequent stages is directly related to the discharge temperature of the first-stage compressor. Therefore, it is necessary to improve the intake temperature of the first-stage compressor. At the same time, the discharge of the last-stage compressor needs to be cooled before it can be used by other gas-consuming equipment or stored through gas storage equipment. At this time, the heat carried in the discharge of the last-stage compressor will be lost into the ambient atmosphere, resulting in waste. Utility Model Content

[0004] Based on this, in order to solve the technical problems existing in the background art, the present invention provides an intake air preheating and temperature control system suitable for compressor units, the specific technical solution of which is as follows:

[0005] An intake air preheating and temperature control system for a compressor unit includes a main preheating device and an auxiliary preheating device. The main preheating device includes a first heat exchanger located at the end of the compressor, a preheater located at the beginning of the compressor, a preheating pipeline connecting the first heat exchanger and the preheater to form a closed loop, a heat-conducting medium filled in the preheating pipeline, and a first circulating pump connected to the preheating pipeline.

[0006] The first heat exchanger is connected to the final outlet pipeline of the final compressor.

[0007] The preheater is connected to the first intake pipe of the first compressor.

[0008] The auxiliary preheating device is connected to the first section of the air intake pipeline.

[0009] The aforementioned intake preheating and temperature control system for compressor units can increase the intake temperature of the first-stage compressor through the main preheating device. At the same time, before the main preheating device has fully preheated the intake temperature in the first-stage intake pipeline, the auxiliary preheating device can increase the intake temperature in the first-stage intake pipeline, reducing the preheating time and helping to ensure constant temperature. In low-temperature winter environments, the compressor intake temperature remains consistent with the design temperature, thereby improving the operational reliability of the compressor unit and increasing the efficiency of the compressor unit in low-temperature environments.

[0010] In one specific embodiment, the auxiliary preheating device includes an electromagnetic heating coil and a heat-conducting metal rod. The heat-conducting metal rod is connected to the central axis of the first section of the air intake pipe and is arranged along the length of the first section of the air intake pipe. The electromagnetic heating coil is arranged around the heat-conducting metal rod and is connected to an external power source.

[0011] The auxiliary preheating device also includes a heat-conducting metal mesh, which is arranged perpendicular to the central axis of the first section of the air intake pipe and connected to the inner wall of the first section of the air intake pipe. The heat-conducting metal rod is connected to the heat-conducting metal mesh.

[0012] In one specific embodiment, there are two thermally conductive metal meshes, each connected to one end of the thermally conductive metal rod.

[0013] In one specific embodiment, the mesh openings of the two thermally conductive metal meshes are staggered.

[0014] In one specific embodiment, the auxiliary preheating device is multiple and evenly spaced and connected to the first section of the air intake pipe.

[0015] In one specific embodiment, the final outlet pipeline of the final compressor includes a first outlet branch and a second outlet branch, wherein the first outlet branch is connected to the first heat exchanger.

[0016] The second outlet branch is connected to a cooler for cooling the compressed air;

[0017] A flow regulating valve is provided on the first outlet branch.

[0018] In one specific embodiment, the system further includes a control unit and several temperature sensors;

[0019] Several of the temperature sensors are respectively installed on the preheater, at the first inlet pipe of the first compressor, and at the last outlet pipe of the last compressor.

[0020] The control unit is connected to the first circulating pump, the auxiliary preheating device, the flow regulating valve, and several temperature sensors.

[0021] In one specific embodiment, the heat-conducting medium is heat-conducting oil or water.

[0022] In one specific embodiment, the compressor unit includes at least three compressors connected in sequence, a second heat exchanger is provided between two adjacent compressors, and the intermediate pipeline between two adjacent compressors passes through the second heat exchanger and is heat-exchange connected to a cooling water pipeline that also passes through the second heat exchanger.

[0023] One end of the cooling water pipeline is connected to a cold water tank, and the other end is connected to a hot water tank. A second circulation pump is installed on the cooling water pipeline.

[0024] Compared with the prior art, the beneficial effects of this application are as follows:

[0025] 1. The main preheating device can increase the intake temperature of the first stage compressor. In low-temperature winter environments, the compressor intake temperature remains consistent with the design temperature, thereby improving the operational reliability of the compressor unit and increasing the efficiency of the compressor unit in low-temperature environments.

[0026] 2. At the same time, before the main preheating device has fully preheated the intake temperature in the first section of the intake pipeline, the auxiliary preheating device is used to increase the intake temperature in the first section of the intake pipeline, thereby reducing the preheating time.

[0027] 3. The auxiliary preheating device can also help ensure a constant intake temperature when the exhaust temperature of the final compressor is unstable. Attached Figure Description

[0028] The present invention can be further understood from the following description taken in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale; rather, the focus is on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0029] Figure 1 This is a schematic diagram of the structure of an intake preheating and temperature control system for a compressor unit, as described in this utility model embodiment.

[0030] Figure 2 This is a schematic diagram of the structure of an auxiliary preheating device for an intake preheating and temperature control system suitable for compressor units, as described in this utility model embodiment.

[0031] Explanation of reference numerals in the attached figures:

[0032] 110. First-stage compressor; 120. Last-stage compressor; 131. First outlet branch; 132. Second outlet branch; 133. Flow regulating valve; 134. Cooler; 140. Gas storage tank; 151. Second heat exchanger; 152. Cooling water pipeline; 153. Cold water tank; 154. Hot water tank; 155. Second circulation pump; 210. First heat exchanger; 220. Preheater; 230. Preheating pipeline; 240. First circulation pump; 310. Electromagnetic heating coil; 320. Thermally conductive metal rod; 330. Thermally conductive metal mesh. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit its scope of protection.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] refer to Figure 1 as well as Figure 2 As shown, an intake preheating and temperature control system for a compressor unit according to one embodiment of the present invention includes a main preheating device and an auxiliary preheating device. The main preheating device includes a first heat exchanger 210 located at the end compressor 120, a preheater 220 located at the first compressor 110, a preheating pipeline 230 connecting the first heat exchanger 210 and the preheater 220 to form a closed loop, a heat-conducting medium filled in the preheating pipeline 230, and a first circulating pump 240 connected to the preheating pipeline 230.

[0036] The first heat exchanger 210 is connected to the final outlet pipeline of the final compressor 120;

[0037] The preheater 220 is connected to the first intake pipe of the first compressor 110;

[0038] The auxiliary preheating device is connected to the first section of the air intake pipeline.

[0039] The aforementioned intake preheating and temperature control system for compressor units can increase the intake temperature of the first-stage compressor 110 through the main preheating device. At the same time, before the main preheating device has fully preheated the intake temperature in the intake pipeline, the auxiliary preheating device can increase the intake temperature in the intake pipeline, reducing the preheating time and helping to ensure constant temperature. In low-temperature winter environments, the compressor intake temperature remains consistent with the design temperature, thereby improving the operational reliability of the compressor unit and increasing the efficiency of the compressor unit in low-temperature environments.

[0040] In some specific embodiments of this utility model, it may also have the following additional technical features: the auxiliary preheating device includes an electromagnetic heating coil 310 and a heat-conducting metal rod 320. The heat-conducting metal rod 320 is connected to the central axis of the first section of the air intake pipe and is arranged along the length of the first section of the air intake pipe. The electromagnetic heating coil 310 is arranged around the heat-conducting metal rod 320 and is connected to an external power source.

[0041] The auxiliary preheating device also includes a heat-conducting metal mesh 330, which is set perpendicular to the central axis of the first section of the air intake pipe and connected to the inner wall of the first section of the air intake pipe. The heat-conducting metal rod 320 is connected to the heat-conducting metal mesh 330.

[0042] In some specific embodiments of this utility model, it may also have the following additional technical features: there are two thermally conductive metal meshes 330, which are respectively connected to the two ends of the thermally conductive metal rod 320.

[0043] The presence of the thermally conductive metal mesh 330 can, on the one hand, assist the thermally conductive metal rod 320 in connecting to the first section of the air intake pipe, and on the other hand, transfer the concentrated heat on the thermally conductive metal rod 320 to make more contact with the ambient air to assist in heating.

[0044] In some specific embodiments of this utility model, it may also have the following additional technical features: the mesh openings of the two thermally conductive metal meshes 330 are respectively staggered.

[0045] In some specific embodiments of this utility model, it may also have the following additional technical features: multiple auxiliary preheating devices are connected to the first section of the air intake pipeline at even intervals.

[0046] Through the above design, by energizing the electromagnetic heating coil 310, electromagnetism is generated, and the magnetic field produces an induced current and heats up the heat-conducting metal rod 320. At this time, the heat on the heat-conducting metal rod 320 is transferred to the heat-conducting metal mesh 330. The ambient air flowing through the air intake pipe exchanges heat with the heat-conducting metal rod 320 and the heat-conducting metal mesh 330. Due to the staggered mesh openings of the heat-conducting metal mesh 330, the airflow can be slowed down, allowing the air to stay in the auxiliary preheating device for a longer time to complete the heat exchange, thereby ensuring the heating effect. At the same time, the staggered mesh openings can also make the airflow turbulent, thus making the gas heat exchange more obvious.

[0047] Specifically, the thermally conductive metal rod 320 and the thermally conductive metal mesh 330 can be selected from metal materials with high thermal conductivity commonly used in the prior art. No restrictions are imposed here, so they will not be elaborated further.

[0048] In some specific embodiments of this utility model, it may also have the following additional technical features: the final outlet pipeline of the final compressor 120 includes a first outlet branch 131 and a second outlet branch 132, and the first outlet branch 131 is connected to the first heat exchanger 210.

[0049] The second exhaust branch 132 is connected to a cooler 134 for cooling compressed air;

[0050] A flow regulating valve 133 is installed on the first air outlet branch 131.

[0051] After passing through the normal cooler 134, the second exhaust branch 132 enters the gas storage tank 140. During the cooling process, heating is achieved. The cooling and heating of the second exhaust branch 132 before entering the gas storage tank 140 is the normal working method of the prior art, which will not be elaborated on here.

[0052] The above design allows for adjustment of the preheating temperature and regulation of the high-temperature air flow entering the first heat exchanger 210, thereby controlling the heat absorbed by the heat transfer medium. When the ambient temperature is low, the opening of the flow regulating valve 133 increases, increasing the heat absorbed by the heat transfer medium and raising its temperature, which in turn raises the temperature of the low-temperature air in the preheater 220. When the ambient temperature rises, the opening of the flow regulating valve 133 decreases, reducing the heat absorbed by the heat transfer medium and thus reducing the temperature rise of the low-temperature air. Ultimately, this effectively controls the air temperature entering the first-stage compressor 110 to remain constant at different temperatures in winter, ensuring that the compressor unit operates in its high-efficiency range. Furthermore, the auxiliary preheating device further ensures a constant exhaust temperature and a constant temperature of the heat storage medium.

[0053] In some specific embodiments of this utility model, it may also have the following additional technical features: the system further includes a control unit (not shown in the figure) and several temperature sensors (not shown in the figure);

[0054] Several temperature sensors are respectively installed on the preheater 220, at the first inlet pipe of the first compressor 110, and at the last outlet pipe of the last compressor 120.

[0055] The control unit is connected to the first circulating pump 240, the auxiliary preheating device, the flow regulating valve 133, and several temperature sensors.

[0056] The control unit determines the required flow rate of compressed air entering the first heat exchanger 210 and the time required for the heating process based on the temperature of the current ambient air measured by the temperature sensor, the preset optimal operating temperature of the compressor, and the temperature of the high-temperature and high-pressure air in the heat exchanger. It then adjusts the opening of the flow regulating valve 133, whether the auxiliary preheating device is turned on, and adjusts the heating power as needed to ensure that the air temperature entering the first stage compressor 110 is constant and achieves precise preheating.

[0057] In some specific embodiments of this utility model, it may also have the following additional technical features: the preheater 220 adopts a plate heat exchanger or a finned tube heat exchanger (the low-temperature ambient air flows on the shell side, and the heat transfer medium used for preheating flows on the tube side); the first heat exchanger 210 adopts a BEM type shell and tube heat exchanger (the high-temperature air flows on the tube side, and the heat transfer medium used for preheating flows on the shell side).

[0058] In some specific embodiments of this utility model, it may also have the following additional technical features: the heat-conducting medium is heat-conducting oil or water.

[0059] In some specific embodiments of this utility model, it may also have the following additional technical features: the compressor unit includes at least three compressors connected in sequence, a second heat exchanger 151 is provided between two adjacent compressors, and the intermediate pipeline between two adjacent compressors passes through the second heat exchanger 151 and is heat-exchange connected to the cooling water pipeline 152 that also passes through the second heat exchanger 151.

[0060] One end of the cooling water pipe 152 is connected to the cold water tank 153, and the other end is connected to the hot water tank 154. A second circulation pump 155 is installed on the cooling water pipe 152.

[0061] The high-temperature compressed air in the intermediate pipeline is cooled by the cooling water in its cooling pipeline through a heat exchanger. The cooled low-temperature compressed air then enters the next stage compressor. The inlet of the cooling pipeline is connected to the cold water tank 153, and the outlet is connected to the hot water tank 154. A second circulation pump 155 is installed on the cooling pipeline to provide circulation power for the cooling water.

[0062] Specifically, the second circulating pump 155 is connected to the control unit, and the second heat exchanger 151 has the same structure as the first heat exchanger 210.

[0063] It should be noted that the control unit and each circulating pump are common technical solutions in the prior art, and will not be described in detail here.

[0064] The first stage compressor receives ambient air for compression. The ambient air is connected to the first stage compressor 110 via the first stage intake pipe. Before entering the first stage compressor 110, the first stage intake pipe is preheated by the preheater 220 and the auxiliary preheating device. After preheating, the air that meets the temperature requirements enters the first stage compressor for compression.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An intake air preheating and temperature control system suitable for compressor units, characterized in that, It includes a main preheating device and an auxiliary preheating device. The main preheating device includes a first heat exchanger (210) located at the end compressor (120), a preheater (220) located at the first compressor (110), a preheating pipeline (230) connecting the first heat exchanger (210) and the preheater (220) to form a closed loop, a heat transfer medium filled in the preheating pipeline (230), and a first circulating pump (240) connected to the preheating pipeline (230). The first heat exchanger (210) is connected to the final outlet pipeline of the final compressor (120); The preheater (220) is connected to the first intake pipe of the first compressor (110); The auxiliary preheating device is connected to the first section of the air intake pipeline.

2. The intake preheating and temperature control system for compressor units according to claim 1, characterized in that, The auxiliary preheating device includes an electromagnetic heating coil (310) and a heat-conducting metal rod (320). The heat-conducting metal rod (320) is connected to the central axis of the first section of the air intake pipe and is arranged along the length of the first section of the air intake pipe. The electromagnetic heating coil (310) is arranged around the heat-conducting metal rod (320). The electromagnetic heating coil (310) is connected to an external power source. The auxiliary preheating device also includes a heat-conducting metal mesh (330), which is arranged perpendicular to the central axis of the first section of the air intake pipe and connected to the inner wall of the first section of the air intake pipe. The heat-conducting metal rod (320) is connected to the heat-conducting metal mesh (330).

3. The intake preheating and temperature control system for compressor units according to claim 2, characterized in that, There are two thermally conductive metal meshes (330) and they are respectively connected to the two ends of the thermally conductive metal rod (320).

4. The intake preheating and temperature control system for compressor units according to claim 3, characterized in that, The mesh openings of the two thermally conductive metal meshes (330) are respectively staggered.

5. A preheating and temperature control system for intake air of a compressor unit according to any one of claims 1-4, characterized in that, Multiple auxiliary preheating devices are connected to the first section of the air intake pipeline at even intervals.

6. The intake preheating and temperature control system for compressor units according to claim 1, characterized in that, The final outlet pipeline of the final compressor (120) includes a first outlet branch (131) and a second outlet branch (132), wherein the first outlet branch (131) is connected to the first heat exchanger (210). The second air outlet branch (132) is connected to a cooler (134) for cooling compressed air; The first air outlet branch (131) is equipped with a flow regulating valve (133).

7. The intake preheating and temperature control system for compressor units according to claim 6, characterized in that, The system also includes a control unit and several temperature sensors; Several of the temperature sensors are respectively installed on the preheater (220), at the first inlet pipe of the first compressor (110), and at the last outlet pipe of the last compressor (120); The control unit is connected to the first circulating pump (240), the auxiliary preheating device, the flow regulating valve (133), and several temperature sensors.

8. The intake preheating and temperature control system for compressor units according to claim 1, characterized in that, The heat-conducting medium is heat-conducting oil or water.

9. The intake preheating and temperature control system for compressor units according to claim 1, characterized in that, The compressor unit includes at least three compressors connected in sequence. A second heat exchanger (151) is provided between two adjacent compressors. The intermediate pipeline between two adjacent compressors passes through the second heat exchanger (151) and is connected to the cooling water pipeline (152) which also passes through the second heat exchanger (151) in a heat exchange manner. One end of the cooling water pipeline (152) is connected to the cold water tank (153), and the other end is connected to the hot water tank (154). A second circulation pump (155) is installed on the cooling water pipeline (152).

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