Suction dryer for recycling waste heat of circulating lubricating oil of screw air compressor

Abstract

The utility model relates to the field of suction dryers, in particular to a screw air compressor circulating lubricating oil waste heat recovery suction dryer which comprises a tower A, a tower B, a screw air compressor and an air blower, the air blower is connected with an efficient heat exchanger through a pipeline, the efficient heat exchanger is connected with a cooler a through a pipeline, and the cooler a is connected with an electric heater through a pipeline; the electric heater is respectively communicated with the tower A and the tower B through pipelines, both the tower A and the tower B are communicated with the air outlet pipe, both the bottoms of the tower A and the tower B are connected with the exhaust pipe, the screw air compressor is respectively connected with the tower A and the tower B through the air inlet pipe, and the screw air compressor is further connected with the efficient heat exchanger through the oil inlet pipe and the oil return pipe. According to the device, high-temperature lubricating oil of the screw air compressor is used for preliminarily heating air, energy consumption needed by the electric heater is reduced, energy is saved, and waste heat of the high-temperature lubricating oil of the screw air compressor is utilized.

Description

Technical Field

[0001] The invention relates to the field of adsorption dryers, and in particular to an adsorption dryer for recovering waste heat from circulating lubricating oil of a screw air compressor. Background Art

[0002] Energy conservation and emission reduction is an absolutely important topic in today's human activities, whether in industrial production or daily consumption. In addition to reducing unnecessary energy consumption, energy conservation is also important for the utilization of waste energy.

[0003] The adsorption dryer is also called adsorption dryer. The adsorption dryer is an important equipment for drying and purifying compressed air during compressed air use. The blast heating regeneration adsorption dryer is a type of adsorption dryer, which is a compressed air drying equipment with slightly complex control but very energy-saving. Patent application number: CN202220735345.1 discloses a blast regeneration internal cooling blowing zero air consumption energy-saving adsorption dryer, including a blower, air can enter from the air inlet of the blower, and during regeneration after adsorption, the air in the environment extracted by the blower can enter the first adsorption tower through the second pipeline, wherein the first adsorption tower is connected to the heater through one end of the three-way pipe, and the other end of the three-way pipe is connected to the intake filter through control valve nine. The ambient air heated by the heater can be used as the regeneration gas source during heating. After the regeneration gas source enters the second adsorption tower through the fourth pipe and the third pipe, the adsorbent can be heated to desorb and regenerate it. The temperature for heating and regenerating the adsorbent is about 180 degrees Celsius. During heating regeneration, the heater needs to heat the regeneration gas source from the external ambient temperature to 180 degrees Celsius, which consumes more energy and is costly.

[0004] The present invention is proposed in view of the deficiencies in the prior art. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a desiccant for recycling waste heat of circulating lubricating oil in a screw air compressor.

[0006] The present invention can be implemented by the following technical solutions:

[0007] The present invention discloses a desiccant dryer for waste heat recovery of the circulating lubricating oil of a screw air compressor, which includes Tower A, Tower B, a screw air compressor and a blower. The blower is connected to a high-efficiency heat exchanger through a pipeline. The high-efficiency heat exchanger is connected to cooler a through a pipeline. Cooler a is connected to an electric heater through a pipeline. The electric heater is connected to Tower A and Tower B respectively through pipelines. Both Tower A and Tower B are connected to an air outlet pipe. The bottoms of both Tower A and Tower B are connected to an exhaust pipe. The screw air compressor is connected to Tower A and Tower B respectively through an intake pipe. The screw air compressor is also connected to the high-efficiency heat exchanger through an oil inlet pipe and an oil return pipe. Tower A and Tower B switch to work alternately. When the adsorbent in Tower A is saturated and cannot adsorb moisture anymore, it switches to Tower B to adsorb moisture and Tower A is regenerated. When the adsorbent in Tower B is saturated and cannot adsorb moisture anymore, it switches to Tower A to adsorb moisture and Tower B is regenerated. When Tower A adsorbs and Tower B is regenerated, the valve on the intake pipe between the screw air compressor and Tower A is opened, the valve on the intake pipe between the screw air compressor and Tower B is closed, and a one-way valve is provided on the pipeline between Tower A and the air outlet pipe. A one-way valve is also provided on the pipeline between Tower B and the air outlet pipe. The air flow generated by the screw air compressor is discharged from the air outlet pipe after being adsorbed by Tower A. The pressure of the air flow of the screw air compressor is high, and the air pressure at one end for regenerating Tower B is relatively low. The air flow generated by the screw air compressor holds down the one-way valve between Tower B and the air outlet pipe, realizing the closing of the pipeline between Tower B and the air outlet pipe. The valve on the pipeline between the electric heater and Tower A is closed, the valve on the pipeline between the electric heater and Tower B is opened, the valve on the pipeline between Tower A and the exhaust pipe is closed, and the valve on the pipeline between Tower B and the exhaust pipe is opened. The high-temperature lubricating oil in the oil-gas separator is connected to the oil inlet pipe through pneumatic three-way valve a, and the oil return pipe is connected to cooler b through pneumatic three-way valve b, realizing that the high-temperature lubricating oil after being compressed by the machine head enters the high-efficiency heat exchanger through the oil inlet pipe and returns to the screw air compressor through the oil return pipe after heat exchange. The working principle of Tower A adsorption is as follows: The air compressed by the screw air compressor is discharged into Tower A through a pipeline. The moisture in the air is adsorbed by the adsorbent in Tower A. After drying the air, the dried air is discharged through the air outlet pipe for equipment use. The principle of heating and regenerating Tower B is as follows: The electric heater is turned on, cooler a is turned off, and the blower is turned on. Due to the action of the blower, the outside air enters the high-efficiency heat exchanger to exchange heat with the high-temperature lubricating oil. The air is heated and then enters cooler a. Cooler a does not work. The air enters the electric heater and is continuously heated by the electric heater to 180°C after being heated by the lubricating oil. The heated air is discharged into Tower B, and the adsorbent in Tower B is heated and regenerated by the high-temperature air. Since the adsorption capacity disappears after the adsorbent is heated, the adsorbent is heated and desorbed by the high-temperature air to remove the moisture inside the adsorbent; The high-temperature moist air is discharged through the exhaust pipe connected to Tower B;The adsorbent loses its adsorption capacity at high temperatures. After the water is discharged, since the high-temperature adsorbent has no adsorption capacity, the adsorbent needs to be cooled and regenerated. When the adsorbent is cooled and regenerated, the pipeline between the high-temperature lubricating oil pipe and the cooler b is opened through the pneumatic three-way valve a, the oil inlet pipe is closed, the pipeline between the high-temperature lubricating oil pipe and the cooler b is opened through the pneumatic three-way valve b, and the oil return pipe is closed. The high-efficiency heat exchanger stops working, the cooler a is turned on, and the electric heater is turned off. Due to the action of the blower, outside air enters the position of the high-efficiency heat exchanger through the pipeline. The high-temperature lubricating oil does not flow to the position of the high-efficiency heat exchanger, and after the temperature of the lubricating oil decreases, it does not exchange heat with the air. The air flows into the cooler a, and the air is cooled by the cooler a. The cooled air is discharged into tower B, and the adsorbent in tower B is blown cold by the low-temperature air. The air is discharged through the exhaust pipe connected to tower B. The temperature of the adsorbent in tower B decreases, and after the adsorbent reaches room temperature, it regains its adsorption capacity, realizing the functional regeneration of the adsorbent in tower B. Similarly, tower A can be regenerated and tower B can be adsorbed, realizing the cyclic operation of tower A and tower B. When the adsorbent is regenerated at high temperatures, first, the high-temperature lubricating oil of the compressor is exported and exchanged heat with the air. After the air is preliminarily heated, it is then heated to 180°C by the electric heater. The lubricating oil of the screw air compressor is compressed with the oil-gas mixture at the head, and the oil temperature of the lubricating oil is about 90°C. After oil-gas separation, the high-temperature lubricating oil is continuously discharged into the high-efficiency heat exchanger to exchange heat with the air, and the air can be gradually heated to 80 - 90°C, and then heated to 180°C by the electric heater. The electric heater needs to provide the energy consumption required for heating from 80 - 90°C to 180°C. The ambient temperature is generally 25 - 35°C in summer and 10 - 25°C in winter. Compared with the energy consumption required for the electric heater to heat the ambient temperature to 180°C, the energy consumption of the electric heater is greatly reduced. This device uses the high-temperature lubricating oil of the screw air compressor to initially heat the air, reducing the energy consumption required by the electric heater, saving energy and making use of the waste heat of the high-temperature lubricating oil of the screw air compressor.;

[0008] Preferably, an air intake filter is also connected to the air inlet of the blower through a pipeline, and a one-way valve is also fixed on the pipeline between the air intake filter and the blower. The impurities are filtered by the air intake filter, and the one-way valve prevents the gas from flowing backward.;

[0009] Preferably, the screw air compressor includes a motor, with a machine head arranged on one side of the motor. The machine head is connected to an oil-gas separator through a pipeline. The oil-gas separator is connected to cooler b through a compressed air pipeline. The compressed air outlet on cooler b is fixed to the intake pipe. The oil-gas separator is also connected to cooler b through a high-temperature lubricating oil pipe. An air-controlled three-way valve a and an air-controlled three-way valve b are successively fixed on the high-temperature lubricating oil pipe. The air-controlled three-way valve a is also connected to the oil inlet of the high-efficiency heat exchanger through an oil inlet pipe. The air-controlled three-way valve b is also connected to the oil outlet of the high-efficiency heat exchanger through an oil return pipe. Cooler b is also connected to the machine head through an oil supply pipe. When the screw air compressor works, compression is driven by the motor to compress lubricating oil and air. The compressed high-temperature oil-gas mixture is discharged into the oil-gas separator for oil-gas separation. After the lubricating oil is separated from the air, the air is cooled by cooler b and then discharged into tower A or tower B for adsorption. The compressed air after water removal is discharged and supplied for equipment use. The high-temperature lubricating oil after oil-gas separation is discharged into the high-efficiency heat exchanger for heat exchange and then returns to the screw air compressor system through the oil return pipe.

[0010] Preferably, an oil filter is also fixed on the oil supply pipe. The lubricating oil is filtered by the oil filter and then discharged into the machine head for use.

[0011] Preferably, an oil outlet pipe is also connected between the high-temperature lubricating oil pipe and the oil supply pipe. The high-temperature lubricating oil pipe is connected to the oil outlet pipe through a temperature control valve. The oil outlet pipe is arranged on the high-temperature lubricating oil pipe between the air-controlled three-way valve b and cooler b. When the temperature of the lubricating oil flowing back through the oil return pipe is lower than the specified temperature, the temperature control valve opens to connect the high-temperature lubricating oil pipe and the oil outlet pipe, and closes the pipeline between the high-temperature lubricating oil pipe and cooler b, and directly discharges the lubricating oil into the oil supply pipe for the machine head to use.

[0012] The present invention has the following advantages compared with the existing technology:

[0013] This device uses the high-temperature lubricating oil of the screw air compressor to initially heat the air, reducing the energy consumption required by the electric heater, saving energy and making use of the waste heat of the high-temperature lubricating oil of the screw air compressor. Description of the Drawings

[0014] The following further details the specific embodiments of the present invention in conjunction with the drawings, where:

[0015] Figure 1 is the schematic diagram of the principle structure of the present invention;

[0016] In the figure: 1. Tower A; 2. Tower B; 3. Electric heater; 4. Cooler a; 5. High-efficiency heat exchanger; 6. Blower; 7. Suction filter; 8. Check valve; 9. Screw air compressor; 10. Exhaust pipe; 11. Intake pipe; 12. Outlet pipe; 13. Compressed air pipeline; 14. Cooler b; 15. High-temperature lubricating oil pipe; 16. Pneumatically controlled three-way valve a; 17. Inlet oil pipe; 18. Temperature control valve; 19. Pneumatically controlled three-way valve b; 20. Return oil pipe; 21. Motor; 22. Machine head; 23. Oil-gas separator; 24. Oil supply pipe; 25. Outlet oil pipe; Detailed implementation manners

[0017] The following makes a detailed description of the implementation manners of the present invention in conjunction with the accompanying drawings:

[0018] Embodiment 1:

[0019] As Figure 1As shown in the figure, this embodiment discloses a desiccant dryer for waste heat recovery of the circulating lubricating oil of a screw air compressor, which includes Tower A 1, Tower B 2, screw air compressor 9 and blower 6. The blower 6 is connected to the high-efficiency heat exchanger 5 through a pipeline. The high-efficiency heat exchanger 5 is connected to the cooler a 4 through a pipeline. The cooler a 4 is connected to the electric heater 3 through a pipeline. The electric heater 3 is respectively communicated with Tower A 1 and Tower B 2 through pipelines. Both Tower A 1 and Tower B 2 are communicated with the air outlet pipe 12. The bottoms of Tower A 1 and Tower B 2 are both connected to the exhaust pipe 10. The screw air compressor 9 is connected to Tower A 1 and Tower B 2 respectively through the air inlet pipe 11. The screw air compressor 9 is also connected to the high-efficiency heat exchanger 5 through the oil inlet pipe 17 and the oil return pipe 20. Tower A 1 and Tower B 2 switch to work alternately. When the adsorbent in Tower A 1 is saturated with adsorption and can no longer adsorb moisture, it switches to Tower B 2 to adsorb moisture, and Tower A 1 is regenerated. When the adsorbent in Tower B 2 is saturated with adsorption and can no longer adsorb moisture, it switches to Tower A 1 to adsorb moisture, and Tower B 2 is regenerated. When Tower A 1 adsorbs and Tower B 2 is regenerated, the valve on the air inlet pipe 11 between the screw air compressor 9 and Tower A 1 is opened, and the valve on the air inlet pipe 11 between the screw air compressor 9 and Tower B 2 is closed. And a one-way valve 8 is provided on the pipeline between Tower A 1 and the air outlet pipe 12, and a one-way valve 8 is also provided on the pipeline between Tower B 2 and the air outlet pipe 12. The air flow generated by the screw air compressor 9 is discharged from the air outlet pipe 12 after being adsorbed by Tower A 1. The pressure of the air flow of the screw air compressor 9 is high, and the air pressure at one end of the regeneration of Tower B 2 is relatively low. The air flow generated by the screw air compressor 9 holds down the one-way valve 8 between Tower B 2 and the air outlet pipe 12, so as to close the pipeline between Tower B 2 and the air outlet pipe 12. The valve on the pipeline between the electric heater 3 and Tower A 1 is closed, and the valve on the pipeline between the electric heater 3 and Tower B 2 is opened. The valve on the pipeline between Tower A 1 and the exhaust pipe 10 is closed, and the valve on the pipeline between Tower B 2 and the exhaust pipe 10 is opened. The high-temperature lubricating oil in the oil-gas separator 23 is communicated with the oil inlet pipe 17 through the pneumatic three-way valve a 16, and the oil return pipe 20 is communicated with the cooler b 14 through the pneumatic three-way valve b 19, so as to realize that the high-temperature lubricating oil after being compressed by the machine head 22 enters the high-efficiency heat exchanger 5 through the oil inlet pipe 17, and returns to the screw air compressor 9 through the oil return pipe 20 after heat exchange. The working principle of Tower A 1 for adsorption is: the air compressed by the screw air compressor 9 is discharged into Tower A 1 through a pipeline, and the moisture in the air is adsorbed by the adsorbent in Tower A 1. After the air is dried, the dried air is discharged through the air outlet pipe 12 for equipment use. The principle of heating and regeneration of Tower B 2 is: the electric heater 3 is turned on, the cooler a 4 is turned off, and the blower 6 is turned on. Due to the action of the blower 6, the outside air enters the high-efficiency heat exchanger 5 to exchange heat with the high-temperature lubricating oil. The air is heated and then enters the cooler a 4. The cooler a 4 does not work. The air enters the electric heater 3 and is continuously heated to 180 °C by the electric heater 3. The heated air is discharged into Tower B 2, and the adsorbent in Tower B 2 is heated and regenerated by the high-temperature air. Since the adsorbent loses its adsorption capacity after being heated,The adsorbent is heated and desorbed by high-temperature air to remove the moisture inside the adsorbent; the high-temperature water-containing air is discharged through the exhaust pipe 10 connected to Tower B 2; the adsorbent loses its adsorption capacity at high temperature. After the water is discharged, since the high-temperature adsorbent has no adsorption capacity, the adsorbent needs to be cooled and regenerated. When the adsorbent is cooled and regenerated, the pipeline between the high-temperature lubricating oil pipe 15 and the cooler b 14 is opened through the pneumatic three-way valve a 16, the oil inlet pipe 17 is closed, the pipeline between the high-temperature lubricating oil pipe 15 and the cooler b 14 is opened through the pneumatic three-way valve b 19, the oil return pipe 20 is closed, the high-efficiency heat exchanger 5 stops working, the cooler a 4 is turned on, the electric heater 3 is turned off. Due to the action of the blower 6, the outside air enters the position of the high-efficiency heat exchanger 5 through the pipeline. The high-temperature lubricating oil does not flow to the position of the high-efficiency heat exchanger 5. After the temperature of the lubricating oil drops, it does not exchange heat with the air. The air flows into the cooler a 4, and the air is cooled by the cooler a 4. The cooled air is discharged into Tower B 2, and the adsorbent in Tower B 2 is blown cold by the low-temperature air. The air is discharged through the exhaust pipe 10 connected to Tower B 2. The temperature of the adsorbent in Tower B 2 drops, and the adsorbent regains its adsorption capacity after reaching room temperature, realizing the functional regeneration of the adsorbent in Tower B 2. Similarly, Tower A 1 can be regenerated, and Tower B 2 can adsorb, realizing the cyclic operation of Tower A 1 and Tower B 2. When the adsorbent is regenerated at high temperature, first, the high-temperature lubricating oil of the compressor is led out and exchanges heat with the air. After the air is preliminarily heated, it is then heated to 180 °C by the electric heater 3. The lubricating oil of the screw air compressor 9 is compressed with the oil-gas mixture at the machine head 22. The oil temperature of the compressed lubricating oil is about 90 °C. After oil-gas separation, the high-temperature lubricating oil is continuously discharged into the high-efficiency heat exchanger 5 to exchange heat with the air, and the air can be gradually heated to 80-90 °C, and then heated to 180 °C by the electric heater 3. The electric heater 3 needs to provide the energy consumption required for heating from 80-90 °C to 180 °C. The ambient temperature is generally 25-35 °C in summer and 10-25 °C in winter. Compared with the energy consumption required for the electric heater 3 to heat the ambient temperature to 180 °C, the energy consumption of the electric heater 3 is greatly reduced. This device uses the high-temperature lubricating oil of the screw air compressor 9 to preliminarily heat the air, reducing the energy consumption required by the electric heater, saving energy and making use of the waste heat of the high-temperature lubricating oil of the screw air compressor 9.

[0020] Among them, an air intake filter 7 is also connected to the air intake of the blower 6 through a pipeline, and a check valve 8 is also fixed on the pipeline between the air intake filter 7 and the blower 6. The impurities are filtered by the air intake filter 7, and the check valve 8 is used to prevent gas backflow.

[0021] Among them, the screw air compressor 9 includes a motor 21. On one side of the motor 21, there is a machine head 22. The machine head 22 is connected to an oil and gas separator 23 through a pipeline. The oil and gas separator 23 is connected to a cooler b14 through a compressed air pipeline 13. The compressed air outlet on the cooler b14 is fixed to the air inlet pipe 11. The oil and gas separator 23 is also connected to the cooler b14 through a high-temperature lubricating oil pipe 15. An air-controlled three-way valve a16 and an air-controlled three-way valve b19 are sequentially fixed on the high-temperature lubricating oil pipe 15. The air-controlled three-way valve a16 is also connected to the oil inlet of the high-efficiency heat exchanger 5 through an oil inlet pipe 17. The air-controlled three-way valve b19 is also connected to the oil outlet of the high-efficiency heat exchanger 5 through an oil return pipe 20. The cooler b14 is also connected to the machine head 22 through an oil supply pipe 24. When the screw air compressor 9 works, it drives compression through the motor 21, compresses the lubricating oil and air. The compressed high-temperature oil and gas mixture is discharged into the oil and gas separator 23 for oil and gas separation. After the lubricating oil is separated from the air, the air is cooled by the cooler b14 and then discharged into the tower A 1 or the tower B 2 for adsorption. The compressed air after water removal is discharged and supplied for equipment use. The high-temperature lubricating oil after oil and gas separation is discharged into the high-efficiency heat exchanger 5 for heat exchange, and then returns to the screw air compressor 9 system through the oil return pipe 20.

[0022] Among them, an oil outlet pipe 25 is also connected between the high-temperature lubricating oil pipe 15 and the oil supply pipe 24. The high-temperature lubricating oil pipe 15 is connected to the oil outlet pipe 25 through a temperature control valve 18. The oil outlet pipe 25 is arranged on the high-temperature lubricating oil pipe 15 between the air-controlled three-way valve b19 and the cooler b14. When the temperature of the lubricating oil flowing back through the oil return pipe 20 is lower than the specified temperature, the temperature control valve 18 opens to connect the high-temperature lubricating oil pipe 15 and the oil outlet pipe 25, and closes the pipeline between the high-temperature lubricating oil pipe 15 and the cooler b14, and directly discharges the lubricating oil into the oil supply pipe 24 for use by the machine head 22.

[0023] Embodiment 2:

[0024] This embodiment discloses a dryer for recovering waste heat from the circulating lubricating oil of a screw air compressor. On the basis of the structure and principle of Embodiment 1, an oil filter is also fixed on the oil supply pipe 24 of this embodiment. The lubricating oil is filtered by the oil filter and then discharged into the machine head 22 for use.

[0025] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, various changes, modifications, substitutions, and variations can be made to these embodiments, and these changes, modifications, substitutions, and variations should also be regarded as the protection scope of the present invention.

Claims

1. A desiccant dryer for waste heat recovery of the circulating lubricating oil of a screw air compressor, comprising a tower A, a tower B, a screw air compressor and a blower, characterized in that, The blower is connected to the high-efficiency heat exchanger through a pipeline. The high-efficiency heat exchanger is connected to cooler a through a pipeline. Cooler a is connected to the electric heater through a pipeline. The electric heater is respectively connected to Tower A and Tower B through pipelines. Tower A and Tower B are both connected to the outlet pipe. The bottoms of Tower A and Tower B are both connected to the exhaust pipe. The screw air compressor is respectively connected to Tower A and Tower B through the intake pipe. The screw air compressor is also connected to the high-efficiency heat exchanger through the inlet oil pipe and the return oil pipe.

2. The dryer for waste heat recovery of the circulating lubricating oil of the screw air compressor according to claim 1, characterized in that: A suction filter is also connected to the air inlet of the blower through a pipeline. A check valve is also fixed on the pipeline between the suction filter and the blower.

3. The dryer for waste heat recovery of the circulating lubricating oil of the screw air compressor according to claim 1, characterized in that: The screw air compressor includes a motor. A machine head is arranged on one side of the motor. The machine head is connected to the oil-gas separator through a pipeline. The oil-gas separator is connected to cooler b through a compressed air pipeline. The compressed air outlet on cooler b is fixed to the intake pipe. The oil-gas separator is also connected to cooler b through a high-temperature lubricating oil pipe. An air-controlled three-way valve a and an air-controlled three-way valve b are successively fixed on the high-temperature lubricating oil pipe. The air-controlled three-way valve a is also connected to the oil inlet of the high-efficiency heat exchanger through the inlet oil pipe. The air-controlled three-way valve b is also connected to the oil outlet of the high-efficiency heat exchanger through the return oil pipe. Cooler b is also connected to the machine head through an oil supply pipe.

4. The dryer for waste heat recovery of the circulating lubricating oil of the screw air compressor according to claim 3, characterized in that: An oil filter is also fixed on the oil supply pipe.

5. The dryer for waste heat recovery of the circulating lubricating oil of the screw air compressor according to claim 3, characterized in that: An outlet oil pipe is also connected between the high-temperature lubricating oil pipe and the oil supply pipe. The high-temperature lubricating oil pipe is connected to the outlet oil pipe through a temperature control valve. The outlet oil pipe is arranged on the high-temperature lubricating oil pipe between the air-controlled three-way valve b and cooler b.

Images