Waste heat recovery energy-saving device of centrifugal air compressor unit

Abstract

The utility model relates to the technical field of air compressor waste heat recovery, and discloses a centrifugal air compressor unit waste heat recovery energy-saving device which comprises an oil waste heat recovery machine, a water storage tank and a dosing tank, a plate heat exchanger is arranged in the oil waste heat recovery machine, the lower portion of the water storage tank is connected with a water inlet pipe, and a circulating pump is installed on the water inlet pipe. The upper part of the water storage tank is connected with a water return pipe; a first electric control valve is installed on the water inlet side of the water inlet pipe, a second electric control valve is installed on the water outlet side of the water return pipe, a communicating pipe is connected between the water inlet pipe and the water return pipe, third electric control valves are installed on the upper portion and the lower portion of the communicating pipe respectively, a flushing pipe is connected to the water inlet pipe, and a fourth electric control valve is installed on the flushing pipe. A dosing pump is mounted on the dosing pipe, a fifth electric control valve is mounted on the liquid inlet side of the dosing pipe, a sixth electric control valve mounted on the water inlet pipe is arranged on the water outlet side of the first electric control valve, a blow-off pipe is mounted on the water inlet pipe, and a seventh electric control valve is mounted on the blow-off pipe.

Description

TECHNICAL FIELD

[0001] The utility model belongs to air compressor waste heat recovery technical field, concretely is a kind of centrifugal air compressor unit waste heat recovery energy-saving device. BACKGROUND

[0002] ‌Centrifugal air compressor is a kind of mechanical equipment using centrifugal force principle to compress gas. Its working principle is to make gas work by high-speed rotating impeller, so that gas obtains kinetic energy and pressure energy under the action of centrifugal force, to realize air compression. Centrifugal air compressor is mainly composed of impeller, diffuser, volute, shafting and other components. When motor drive shafting rotates at high speed, impeller installed on shaft also rotates at high speed, and external air is sucked at the center of impeller. With the rotation of impeller, air obtains very high speed and kinetic energy. Subsequently, high-speed airflow enters diffuser, and in diffuser, the speed of airflow gradually decreases, while the pressure continuously increases. Finally, compressed air is discharged from volute into subsequent process flow.

[0003] In order to save energy, existing centrifugal air compressor is specially provided with oil waste heat recovery device, so as to heat high-temperature oil generated by air compressor. High-temperature oil and water are heat-exchanged through plate heat exchanger, and water after heat exchange is stored in water storage tank, so as to facilitate water use. In the above-mentioned heat exchange structure, circulating pipeline is needed to make water circulate and flow to exchange heat, but with pipeline operation, scale is easily generated in pipeline, which affects heat exchange and blocks pipeline. In order to solve scale, personnel maintenance is manually operated periodically, which is troublesome and low in maintenance efficiency. In order to solve the above-mentioned problems, a centrifugal air compressor unit waste heat recovery energy-saving device is provided. UTILITY MODEL CONTENTS

[0004] The utility model aims at: in order to solve the above-mentioned problems, provide a kind of centrifugal air compressor unit waste heat recovery energy-saving device.

[0005] The technical scheme adopted by the utility model is as follows: a kind of centrifugal air compressor unit waste heat recovery energy-saving device, including centrifugal air compressor unit, oil waste heat recovery machine, water storage tank and descaling agent dosing tank, the oil waste heat recovery machine is internally provided with plate heat exchanger, the air compressor unit is connected with the plate heat exchanger by oil circuit pipeline, the lower part of the water storage tank is connected with water inlet pipe, and the circulating pump is installed on the water inlet pipe, and the water outlet end of the water inlet pipe is connected with the plate heat exchanger, the upper part of the water storage tank is connected with return pipe, and the water inlet end of the return pipe is connected with the plate heat exchanger;

[0006] The water inlet side of the water inlet pipe is provided with an electric control valve one, the water outlet side of the water return pipe is provided with an electric control valve two, a communication pipe is connected between the water inlet pipe and the water return pipe, the upper part and the lower part of the communication pipe are provided with an electric control valve three, a flushing pipe is connected to the water inlet pipe, the flushing pipe is provided with an electric control valve four, the lower part of the dosing tank is connected with a dosing pipe, the dosing pipe is provided with a dosing pump, the liquid inlet side of the dosing pipe is provided with an electric control valve five, the water outlet side of the electric control valve one is provided with an electric control valve six which is arranged on the water inlet pipe, the water inlet pipe is provided with a blowdown pipe, and the blowdown pipe is provided with an electric control valve seven.

[0007] In a preferred embodiment, the flushing pipe is arranged at the liquid outlet side of the electric control valve six, the blowdown pipe is arranged between the electric control valve one and the electric control valve five, and the communication pipe is arranged between the electric control valve one and the electric control valve five at the connection position with the water inlet pipe.

[0008] In a preferred embodiment, the highest position of the water return pipe is provided with a liquid level pipe, the liquid inlet side of the liquid level pipe is provided with an electric control valve eight, and the liquid outlet side of the liquid level pipe is provided with a photoelectric liquid level sensor.

[0009] In a preferred embodiment, the flushing pipe is connected with a tap water supply pipe network.

[0010] In a preferred embodiment, the water outlet pipe connected to the water storage tank is connected with a water pipe network, and the water outlet pipe is provided with an electric control valve nine.

[0011] In a preferred embodiment, the water storage tank is connected with a water supplement pipe, the water supplement pipe is connected with a tap water supply pipe network, and the water supplement pipe is provided with an electric control valve ten.

[0012] In summary, due to the adoption of the above technical scheme, the present application has the following beneficial effects:

[0013] 1. The present application can automatically clean the heat exchange water pipe, which is more convenient than manual cleaning and improves the cleaning efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the present application;

[0015] Figure 2 It is a schematic diagram of the front view of the internal structure of the present application;

[0016] Figure 3 It is a schematic diagram of the connection structure of the plate heat exchanger and the heat exchange water pipe in the present application.

[0017] The diagram is labeled as follows: 1-Centrifugal air compressor unit, 2-Oil waste heat recovery machine, 3-Water storage tank, 4-Dosing tank, 5-Plate heat exchanger, 6-Inlet pipe, 7-Circulating pump, 8-Return pipe, 9-Electrically controlled valve 1, 10-Electrically controlled valve 2, 11-Connecting pipe, 12-Electrically controlled valve 3, 13-Flushing pipe, 14-Electrically controlled valve 4, 15-Dosing pipe, 16-Dosing pump, 17-Electrically controlled valve 5, 18-Electrically controlled valve 6, 19-Drain pipe, 20-Electrically controlled valve 7, 21-Level pipe, 22-Electrically controlled valve 8, 23-Photoelectric level sensor, 24-Outlet pipe, 25-Electrically controlled valve 9, 26-Make-up water pipe, 27-Electrically controlled valve 10. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] The following will combine Figures 1-3 This invention provides a detailed description of a waste heat recovery and energy-saving device for a centrifugal air compressor unit according to an embodiment of the present invention.

[0020] Example:

[0021] This utility model provides an energy-saving device for waste heat recovery of a centrifugal air compressor unit, as referenced. Figures 1 to 3 As shown, the system includes a centrifugal air compressor unit 1, an oil waste heat recovery unit 2, and a water storage tank 3. The oil waste heat recovery unit 2 is equipped with a plate heat exchanger 5. The air compressor unit is connected to the plate heat exchanger 5 via an oil pipeline. A water inlet pipe 6 is connected to the lower part of the water storage tank 3, and a circulation pump 7 is installed on the water inlet pipe 6. The outlet end of the water inlet pipe 6 is connected to the plate heat exchanger 5. A return water pipe 8 is connected to the upper part of the water storage tank 3, and the inlet end of the return water pipe 8 is connected to the plate heat exchanger 5. In this structure, the high-temperature oil from the centrifugal air compressor unit 1 enters the plate heat exchanger 5 through the pipeline. Simultaneously, the circulation pump 7 is started, causing water from the water storage tank 3 to enter the plate heat exchanger 5 through the water inlet pipe 6. The plate heat exchanger 5 exchanges heat between the high-temperature oil and water, thereby recovering the waste heat from the centrifugal air compressor unit 1. The heated water then flows back to the water storage tank 3 through the return water pipe 8 for storage, facilitating subsequent distribution and use.

[0022] It should be noted that the centrifugal air compressor unit 1 and plate heat exchanger 5 mentioned above are existing equipment, and their specific principles and structures are publicly disclosed. Furthermore, this application does not make any improvements to the structure of the centrifugal air compressor unit 1 and plate heat exchanger 5, so they will not be described in detail here.

[0023] Reference Figures 1 to 3 As shown, including the dosing tank 4, the water inlet side of the water inlet pipe 6 is provided with electric control valve one 9, the water outlet side of the water return pipe 8 is provided with electric control valve two 10, the communication pipe 11 is connected between the water inlet pipe 6 and the water return pipe 8, the upper and lower parts of the communication pipe 11 are provided with electric control valve three 12, the water inlet pipe 6 is connected with the flushing pipe 13, the flushing pipe 13 is connected with the water supply pipe network, the flushing pipe 13 is provided with electric control valve four 14, the lower part of the dosing tank 4 is connected with the dosing pipe 15, the dosing pipe 15 is provided with dosing pump 16, the liquid outlet side of the dosing pipe 15 is provided with electric control valve five 17, the water outlet side of the electric control valve one 9 is provided with electric control valve six 18 installed on the water inlet pipe 6, the water inlet pipe 6 is provided with blowdown pipe 19, the blowdown pipe 19 is provided with electric control valve seven 20, the highest part of the water return pipe 8 is provided with liquid level pipe 21, the liquid inlet side of the liquid level pipe 21 is provided with electric control valve eight 22, the liquid outlet side of the liquid level pipe 21 is provided with photoelectric liquid level sensor 23, when the water circulation heat exchange pipeline and the plate heat exchanger 5 of the water storage tank 3 need to be descaled and maintained, at this time, the electric control valve one 9 of the water inlet pipe 6 and the electric control valve two 10 of the water return pipe 8 are closed, then the electric control valve three 12 of the communication pipe 11 and the electric control valve seven 20 of the blowdown pipe 19 are opened, so as to discharge the water in the entire heat exchange pipeline, when the preset emptying time is reached, then the electric control valve seven 20 is closed and the electric control valve eight 22 of the liquid level pipe 21 is opened, and at the same time, the electric control valve five 17 of the dosing pipe 15 is opened, at this time, the dosing pump 16 is started to run, so as to inject the prepared descaling agent into the flushing pipe 13 through the dosing pipe, then the flushing pipe 13 injects the descaling agent into the entire heat exchange pipeline, when the liquid level reaches the photoelectric liquid level sensor 23 of the liquid level pipe 21, at this time, the dosing pump 16, the electric control valve five 17 and the electric control valve eight 22 are closed, then the descaling agent is dissolved, when the descaling time is reached, at this time, the electric control valve seven 20 is opened, at this time, the descaling agent dissolved with the scale is discharged from the pipeline, when the preset emptying time is reached, at this time, the electric control valve six 18 of the water inlet pipe 6 is closed, and at the same time, the electric control valve four 14 of the flushing pipe 13 is opened, so as to make the external tap water enter into the pipeline, and at the same time, the circulating pump 7 is started to deliver the tap water to the entire pipeline, and finally, the tap water is discharged from the opened blowdown pipe 19, so as to realize the sufficient flushing of the entire pipeline, so as to remove the descaling agent, when the flushing time is reached, at this time, the electric control valve four 14 is closed and the circulating pump 7 is stopped, after the communication pipe 11 is emptied, then the electric control valve three 12 and the electric control valve seven 20 are closed, then the electric control valve six 18 is opened, and at the same time, the electric control valve one 9 and the electric control valve two 10 are opened, so as to make the pipeline communicate with the water storage tank 3, so as to complete the automatic descaling and cleaning of the pipeline.

[0024] The entire structure can realize the automatic descaling and cleaning of the heat exchange water pipeline, compared with the existing manual cleaning, the descaling operation will be more convenient.

[0025] Reference Figures 1 to 3As shown, the flushing pipe 13 is arranged at the liquid outlet side of the electric control valve six 18, the blowdown pipe 19 is arranged between the electric control valve one 9 and the electric control valve five 17, and the communication pipe 11 is arranged between the electric control valve one 9 and the electric control valve five 17.

[0026] Reference Figures 1 to 3 As shown, the water tank 3 is connected with a water outlet pipe 24, the water outlet pipe 24 is connected with a water supply pipe network, and the electric control valve nine 25 is arranged on the water outlet pipe 24. In this structure, the water outlet pipe 24 is used to conveniently deliver hot water from the water tank 3 to the water supply pipe network, and the electric control valve nine 25 is used to control the opening and closing of the water outlet pipe 24.

[0027] Reference Figures 1 to 3 As shown, the water tank 3 is connected with a water supplement pipe 26, the water supplement pipe 26 is connected with a tap water supply pipe network, and the electric control valve ten 27 is arranged on the water supplement pipe 26. In this structure, the water supplement pipe 26 is used to supplement water to the water tank 3, and the electric control valve ten 27 is used to control the opening and closing of the water supplement pipe 26.

[0028] It should be noted that the above-mentioned electric control valves and the photoelectric liquid level sensor 23 are all existing devices, the model of the photoelectric liquid level sensor 23 is FS-IR1902D, and the above-mentioned electric control valves and the photoelectric liquid level sensor 23 are all connected with a PLC control end. The control program of the PLC control end is used to control the electric control valves and the photoelectric liquid level sensor 23 to operate cooperatively, and the specific control device and control program of the PLC control end have been disclosed, and the control device and control program are not improved in this application, so they will not be introduced here.

[0029] The implementation principle of the waste heat recovery and energy saving device of the centrifugal air compressor unit is as follows: when the water circulation heat exchange pipeline of the water storage tank 3 and the plate heat exchanger 5 need to be descaled and maintained, the electric control valve one 9 of the water inlet pipe 6 and the electric control valve two 10 of the backwater pipe 8 are closed, the electric control valve three 12 of the communication pipe 11 and the electric control valve seven 20 of the blowdown pipe 19 are opened, so that the water in the entire heat exchange pipeline is discharged, when the preset emptying time is reached, the electric control valve eight 22 of the liquid level pipe 21 is opened, the electric control valve five 17 of the dosing pipe 15 is opened at the same time, the dosing pump 16 is started to run, the prepared descaling agent is injected into the flushing pipe 13 through the dosing pipe, then the flushing pipe 13 injects the descaling agent into the entire heat exchange pipeline, when the liquid level reaches the photoelectric liquid level sensor 23 of the liquid level pipe 21, the dosing pump 16, the electric control valve five 17 and the electric control valve eight 22 are closed, then the descaling agent dissolves the water scale, when the descaling time is reached, the electric control valve seven 20 is opened, the descaling agent dissolved with the water scale is discharged, when the preset emptying time is reached, the electric control valve six 18 of the water inlet pipe 6 is closed, the electric control valve four 14 of the flushing pipe 13 is opened at the same time, so that the external tap water enters the pipeline, the circulating pump 7 is started at the same time to deliver the tap water to the entire pipeline, and finally the tap water is discharged through the opened blowdown pipe 19, so that the pipeline is fully flushed, so that the descaling agent is removed, when the flushing time is reached, the electric control valve four 14 is closed and the circulating pump 7 is stopped, after the communication pipe 11 is emptied, the electric control valve three 12 and the electric control valve seven 20 are closed, the electric control valve six 18 is opened, and the electric control valve one 9 and the electric control valve two 10 are opened at the same time, so that the pipeline is connected with the water storage tank 3 to run, so that the automatic descaling and cleaning of the pipeline are completed.

[0030] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A kind of centrifugal air compressor unit waste heat recovery energy-saving device, including centrifugal air compressor unit (1), oil waste heat recovery machine (2), water storage tank (3) and descaling agent dosing tank (4), it is characterized by: The oil waste heat recovery machine (2) is internally provided with a plate heat exchanger (5), the air compressor unit is connected with the plate heat exchanger (5) through an oil pipeline, the lower portion of the water storage tank (3) is connected with a water inlet pipe (6), a circulating pump (7) is installed on the water inlet pipe (6), the water outlet end of the water inlet pipe (6) is connected with the plate heat exchanger (5), the upper portion of the water storage tank (3) is connected with a water return pipe (8), and the water inlet end of the water return pipe (8) is connected with the plate heat exchanger (5); An electric control valve one (9) is installed on the water inlet side of the water inlet pipe (6), an electric control valve two (10) is installed on the water outlet side of the water return pipe (8), a communication pipe (11) is connected between the water inlet pipe (6) and the water return pipe (8), electric control valve threes (12) are installed on the upper portion and the lower portion of the communication pipe (11), a flushing pipe (13) is connected to the water inlet pipe (6), an electric control valve four (14) is installed on the flushing pipe (13), a dosing pipe (15) is connected to the lower portion of the dosing tank (4), a dosing pump (16) is installed on the dosing pipe (15), an electric control valve five (17) is installed on the liquid outlet side of the dosing pipe (15), an electric control valve six (18) is arranged on the water inlet pipe (6) and arranged on the liquid outlet side of the electric control valve six (18), a blowdown pipe (19) is installed on the water inlet pipe (6), and an electric control valve seven (20) is installed on the blowdown pipe (19).

2. A waste heat recovery and energy saving device for a centrifugal air compressor unit (1) according to claim 1, characterized in that: The flushing pipe (13) is arranged on the liquid outlet side of the electric control valve six (18), the blowdown pipe (19) is arranged between the electric control valve one (9) and the electric control valve five (17), and the communication pipe (11) is arranged between the electric control valve one (9) and the electric control valve five (17) at the connection position with the water inlet pipe (6).

3. A waste heat recovery and energy saving device for a centrifugal air compressor unit (1) according to claim 1, characterized in that: A liquid level pipe (21) is installed on the highest position of the water return pipe (8), an electric control valve eight (22) is installed on the liquid inlet side of the liquid level pipe (21), and a photoelectric liquid level sensor (23) is installed on the liquid outlet side of the liquid level pipe (21).

4. A waste heat recovery and energy saving device for a centrifugal air compressor unit (1) according to claim 1, characterized in that: The flushing pipe (13) is connected with a tap water supply pipe network.

5. A waste heat recovery and energy saving device for a centrifugal air compressor unit (1) according to claim 1, characterized in that: A water outlet pipe (24) is connected to the water storage tank (3), the water outlet pipe (24) is connected with a water pipe network, and an electric control valve nine (25) is installed on the water outlet pipe (24).

6. A waste heat recovery and energy saving device for a centrifugal air compressor unit (1) according to claim 1, characterized in that: A water supplement pipe (26) is connected to the water storage tank (3), the water supplement pipe (26) is connected with a tap water supply pipe network, and an electric control valve ten (27) is installed on the water supplement pipe (26).

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