Energy-saving adsorption dryer for clean waste gas recovery

Abstract

The utility model discloses an energy -conserving adsorption type drying machine for clean waste gas recovery, including first adsorption tower A and second adsorption tower B, first adsorption tower A with second adsorption tower B bottom is equipped with the air inlet pipeline, be equipped with A tower exhaust valve, A tower air inlet valve, B tower exhaust valve and B tower air inlet valve on the air inlet pipeline, first adsorption tower A with second adsorption tower B top is equipped with the air outlet pipeline, be equipped with the regenerative gas air inlet valve on the air outlet pipeline, rear end connection nitrogen making or oxygen making system, nitrogen making or oxygen making system bottom is equipped with the air outlet pipeline, the air outlet pipeline connects waste gas recovery pipeline, waste gas recovery pipeline connects the regenerative gas storage tank, the regenerative gas storage tank is connected with the air outlet pipeline through clean waste gas pipeline, the utility model has the characteristics such as compact structure, waste gas recycling effect is good, energy -conserving environmental protection and good work stability, can be widely used in the production technical field of various industrial air separation equipment drying machine.

Description

Technical Field

[0001] This utility model belongs to the technical field of adsorption dryer equipment, specifically relating to an energy-saving adsorption dryer for clean waste gas recovery. Background Technology

[0002] Currently, compressed air dryers can be broadly classified into two types: refrigerated dryers and adsorption dryers. Adsorption dryers utilize the principle of desorption regeneration to continuously produce dry air. Conventional micro-heating adsorption compressed air dryers are devices that dry compressed air based on the principle of pressure swing adsorption, applying a micro-heating regeneration method. The desorption regeneration process involves heating a portion of the dry air to cause it to expand. When this gas comes into contact with an adsorbent saturated with moisture, the moisture in the adsorbent is diverted to the regeneration air until equilibrium is reached, thus drying the adsorbent. This is the desorption (regeneration) process. The desorption regeneration process consumes a portion (≈7%) of clean compressed air and requires electrical energy to heat this portion of compressed air to approximately 120°C, resulting in significant energy consumption.

[0003] Patent application number "202122179949.0" discloses an energy-saving adsorption dryer, which features a heater located between the first and second adsorption towers, characterized by its simple structure, compact size, and stable dew point control. Patent application number "20182054789.1" introduces an adsorption dryer with waste heat recovery and regeneration, comprising a first adsorption tower, a second adsorption tower, an electrical control box, a cooler, a gas-liquid separator, and a hot water heater. It regenerates the adsorbent by utilizing the waste heat from the air compressor's exhaust, and simultaneously uses the hot water heater and cooler to cold-blow the regenerated adsorbent, achieving energy savings. However, existing energy-saving adsorption dryers often lack utilization of clean waste gas generated by nitrogen or oxygen generators, or the utilization effect is poor. For example, when the nitrogen or oxygen generator is not working, the lack of clean waste gas will cause the dryer to malfunction, or it may require regeneration using the prepared nitrogen or oxygen, which not only fails to achieve energy savings but also wastes more energy. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide an energy-saving adsorption dryer for clean waste gas recovery. It has the characteristics of compact structure, good waste gas recovery and utilization effect, energy saving and environmental protection, and good working stability. It can be widely used in the production technology field of dryers for various industrial air separation equipment.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: an energy-saving adsorption dryer for clean waste gas recovery, comprising a first adsorption tower A and a second adsorption tower B. The bottom of the first adsorption tower A and the second adsorption tower B are provided with inlet pipes. The inlet pipes have an inlet port at the front end and a first silencer at the rear end. The inlet pipes are also equipped with an A-tower exhaust valve, an A-tower inlet valve, a B-tower exhaust valve, and a B-tower inlet valve. The top of the first adsorption tower A and the second adsorption tower B are provided with outlet pipes. The outlet pipes are equipped with regeneration gas inlet valves, and their rear ends are connected to a nitrogen or oxygen generation system. The bottom of the nitrogen or oxygen generation system is provided with an exhaust pipe, which is connected to a waste gas recovery pipe. The waste gas recovery pipe is connected to a regeneration gas storage tank, which is connected to the outlet pipe via a clean waste gas pipe. The clean waste gas pipe is also equipped with a clean waste gas inlet valve, through which gas for desorption and regeneration is supplied to the dryer.

[0006] As an improvement, pressure gauges are provided on the top sides of both the first adsorption tower A and the second adsorption tower B.

[0007] As an improvement, the first adsorption tower A and the second adsorption tower B are equipped with a desiccant, which is a molecular sieve.

[0008] As an improvement, the exhaust valve and inlet valve of tower A are located at the bottom of the first adsorption tower A, and the exhaust valve and inlet valve of tower B are located at the bottom of the second adsorption tower B, with the exhaust valve and inlet valve being symmetrically distributed.

[0009] As an improvement, heaters are connected to both ends of the gas outlet pipe, and the heaters are electric heaters, which further heat and dry the gas.

[0010] As an improvement, the gas outlet pipeline is equipped with a gas outlet check valve for tower A and a gas outlet check valve for tower B, and the gas outlet check valves for tower A and tower B are symmetrically arranged on the left and right sides respectively.

[0011] As an improvement, the regenerated gas inlet valve and the clean exhaust gas inlet valve are arranged perpendicularly to each other.

[0012] As an improvement, the nitrogen or oxygen generation system includes two adsorption tanks, with a finished gas pipeline at the top and a second silencer on the exhaust pipeline at the bottom.

[0013] As an improvement, a flow control device is provided at the end of the finished gas pipeline, and a finished gas outlet is provided at the rear end of the flow control device.

[0014] As an improvement, the nitrogen or oxygen generation system is connected to a solenoid valve control device, which is connected to a PLC integrated control system.

[0015] The beneficial effects of this utility model are as follows: An energy-saving adsorption dryer for clean waste gas recovery features a compact structure, good waste gas recovery efficiency, energy saving and environmental protection, and good operational stability. By employing a dual-valve control structure with a regenerated gas inlet valve and a clean waste gas inlet valve, when the nitrogen or oxygen production system is working, a portion of the waste gas discharged from the system is collected and stored in a regenerated gas storage tank under PLC program control. Opening the clean waste gas inlet valve and closing the regenerated gas inlet valve allows the regenerated gas stored in the tank to regenerate the dryer. This eliminates the need for clean compressed air, saving compressed air and electricity. Furthermore, when the nitrogen or oxygen production system is operating, a portion of the waste gas discharged from the system is collected and stored in a regenerated gas storage tank under PLC program control. When the nitrogen or oxygen generation system is not working, open the regeneration gas inlet valve and close the clean exhaust gas inlet valve. At this time, the dryer will return to normal operation as a micro-thermal adsorption dryer. This requires the consumption of some clean compressed air and electricity for regeneration, thus achieving a bidirectional and stable regeneration function for the dryer. In addition, by installing a PLC control system in the nitrogen or oxygen generation system, clean exhaust gas can be selectively collected to ensure stable gas pressure in the regeneration gas storage tank. Since the clean exhaust gas comes from the nitrogen generator or oxygen generator, it is very clean and has low moisture content after passing through the dryer and the nitrogen / oxygen generator, making it very suitable as regeneration gas for adsorption dryers. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of an energy-saving adsorption dryer for clean waste gas recovery according to this utility model.

[0017] In the diagram: 1. First adsorption tower A, 2. Second adsorption tower B, 3. Inlet pipe, 4. Inlet, 5. First silencer, 6. A-tower exhaust valve, 7. A-tower inlet valve, 8. B-tower exhaust valve, 9. B-tower inlet valve, 10. Outlet pipe, 11. Regenerated gas inlet valve, 12. Nitrogen or oxygen production system, 13. Exhaust pipe, 14. Waste gas recovery pipe, 15. Regenerated gas storage tank, 16. Clean waste gas pipe, 17. Clean waste gas inlet valve, 18. Pressure gauge, 19. Heater, 20. A-tower outlet check valve, 21. B-tower outlet check valve, 22. Adsorption tank, 23. Finished gas pipe, 24. Second silencer, 25. Flow control device, 26. Finished gas outlet, 27. Solenoid valve control device, 28. Drain valve. Detailed Implementation

[0018] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0019] like Figure 1As shown in this embodiment, an energy-saving adsorption dryer for clean waste gas recovery includes a first adsorption tower A1 and a second adsorption tower B2. The bottom of both the first adsorption tower A1 and the second adsorption tower B2 is provided with an inlet pipe 3. The inlet pipe 3 has an inlet port 4 at its front end and a first silencer 5 at its rear end. The inlet pipe 3 is also equipped with an A-tower exhaust valve 6, an A-tower inlet valve 7, a B-tower exhaust valve 8, and a B-tower inlet valve 9. The top of both the first adsorption tower A1 and the second adsorption tower B2 is provided with an outlet pipe 10, on which a regeneration gas inlet is located. A gas valve 11 is connected to a nitrogen or oxygen generation system 12 at its rear end. The nitrogen or oxygen generation system 12 is provided with an exhaust pipe 13 at its bottom, which is connected to a waste gas recovery pipe 14. The waste gas recovery pipe 14 is connected to a regeneration gas storage tank 15, which is connected to the outlet pipe 10 through a clean waste gas pipe 16. Specifically, the regeneration gas storage tank 15 is provided with a drain valve 28 at its bottom. The clean waste gas pipe 16 is also provided with a clean waste gas inlet valve 17, which provides gas for desorption and regeneration to the dryer.

[0020] Furthermore, pressure gauges 18 are provided on the top sides of both the first adsorption tower A1 and the second adsorption tower B2 to monitor the internal pressure of the adsorption towers in real time. Specifically, desiccant is provided inside the first adsorption tower A1 and the second adsorption tower B2. The desiccant is a molecular sieve. The compressed gas is dried and dehydrated by the molecular sieve desiccant. At the same time, the molecular sieve has a reciprocating cycle function to meet the clean gas source requirements of the downstream oxygen or nitrogen generation system.

[0021] Furthermore, the exhaust valve 6 and the inlet valve 7 of tower A are located at the bottom of the first adsorption tower A1, and the exhaust valve 8 and the inlet valve 9 of tower B are located at the bottom of the second adsorption tower B2, and the exhaust valves and inlet valves are symmetrically distributed.

[0022] Furthermore, the gas outlet pipe 10 is connected to heaters 19 at both ends, and the heaters 19 are electric heaters, which further heat and dry the gas. Specifically, the gas outlet pipe 10 is equipped with an A-tower gas outlet check valve 20 and a B-tower gas outlet check valve 21, which are symmetrically arranged on the left and right sides, respectively. The A-tower gas outlet check valve 20 and the B-tower gas outlet check valve 21 prevent the dried gas from flowing back into the adsorption tower.

[0023] Furthermore, the regeneration gas inlet valve 11 and the clean exhaust gas inlet valve 17 are vertically intersecting. Specifically, the regeneration gas source is independently controlled by the two vertically intersecting regeneration gas inlet valves 11 and 17. When the nitrogen or oxygen generation system 12 is working, the clean exhaust gas inlet valve 17 can be opened to provide the regeneration gas source; when the nitrogen or oxygen generation system 12 stops working, the regeneration gas inlet valve 11 can be opened to provide the regeneration gas source using clean compressed air and a heater.

[0024] Furthermore, the nitrogen or oxygen generation system 12 includes two adsorption tanks 22, with a finished gas pipeline 23 at the top and a second silencer 24 on the exhaust pipeline at the bottom; specifically, a flow control device 25 is provided at the end of the finished gas pipeline 23, and a finished gas outlet 26 is provided at the rear end of the flow control device 25; even further, the nitrogen or oxygen generation system 12 is connected to a solenoid valve control device 27, which is connected to a PLC integrated control system, and the PLC integrated control system controls the intelligent cyclic operation of the nitrogen or oxygen generation system.

[0025] This utility model discloses an energy-saving adsorption dryer for clean waste gas recovery, featuring a compact structure, excellent waste gas recovery and utilization effect, energy saving and environmental protection, and good operational stability. By adding a clean waste gas inlet valve 17 and a regeneration gas storage tank 15 before the electric heater, when the nitrogen or oxygen generation system 12 is working, a portion of the waste gas discharged from the system is collected and stored in the regeneration gas storage tank 15 through program control. By opening the clean waste gas inlet valve 17 and closing the regeneration gas inlet valve 11, the dryer can be regenerated using the regeneration gas stored in the tank. This process eliminates the need for clean compressed air, effectively saving compressed air and electricity. When the nitrogen or oxygen generation system 12 is not working, the regeneration gas inlet valve 11 is opened and the clean waste gas inlet valve 17 is closed, at which point the dryer returns to normal operation as a micro-heat adsorption dryer, requiring the consumption of some clean compressed air and electricity for regeneration.

[0026] Finally, it should be noted that the above examples are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. An energy-saving adsorption dryer for clean exhaust gas recovery, comprising a first adsorption tower A (1) and a second adsorption tower B (2), characterized in that, The first adsorption tower A (1) and the second adsorption tower B (2) are provided with an air inlet pipe (3) at the bottom. The front end of the air inlet pipe (3) is provided with an air inlet (4), and the rear end is provided with a first silencer (5). The air inlet pipe (3) is also provided with an A-tower exhaust valve (6), an A-tower air inlet valve (7), a B-tower exhaust valve (8), and a B-tower air inlet valve (9). The first adsorption tower A (1) and the second adsorption tower B (2) are provided with an air outlet pipe (10) at the top. The air outlet pipe (10) is provided with a regeneration gas inlet valve (11), and the rear end is connected to A nitrogen or oxygen generation system (12) is connected; the nitrogen or oxygen generation system (12) is provided with an exhaust pipe (13) at the bottom, and the exhaust pipe (13) is connected to a waste gas recovery pipe (14); the waste gas recovery pipe (14) is connected to a regeneration gas storage tank (15), and the regeneration gas storage tank (15) is connected to the outlet pipe (10) through a clean waste gas pipe (16); a clean waste gas inlet valve (17) is also provided on the clean waste gas pipe (16), and the clean waste gas inlet valve (17) provides the dryer with gas for desorption and regeneration.

2. The adsorption dryer according to claim 1, characterized in that Pressure gauges (18) are provided on the top side of both the first adsorption tower A (1) and the second adsorption tower B (2).

3. The adsorption dryer according to claim 2, characterized in that, The first adsorption tower A (1) and the second adsorption tower B (2) are equipped with a desiccant, which is a molecular sieve.

4. The adsorption dryer according to claim 1, characterized in that, The exhaust valve (6) and inlet valve (7) of tower A are located at the bottom of the first adsorption tower A (1), and the exhaust valve (8) and inlet valve (9) of tower B are located at the bottom of the second adsorption tower B (2), and the exhaust valve and inlet valve are symmetrically distributed.

5. The adsorption dryer according to claim 1, characterized in that The air outlet pipe (10) is connected to heaters (19) at both ends, and the heaters (19) are electric heaters.

6. The adsorption dryer according to claim 5, characterized in that The gas outlet pipeline (10) is equipped with a gas outlet check valve (20) for tower A and a gas outlet check valve (21) for tower B, and the gas outlet check valve (20) for tower A and the gas outlet check valve (21) for tower B are symmetrically arranged on the left and right sides respectively.

7. The adsorption dryer according to claim 1, characterized in that, The regenerated gas inlet valve (11) and the clean exhaust gas inlet valve (17) are vertically intersecting.

8. The adsorption dryer according to claim 1, characterized in that The nitrogen or oxygen generation system (12) includes two adsorption tanks (22), with a finished gas pipeline (23) at the top and a second silencer (24) on the exhaust pipeline at the bottom.

9. The adsorption dryer according to claim 8, characterized in that The finished gas pipeline (23) is equipped with a flow control device (25) at the end, and the finished gas outlet (26) is provided at the rear end of the flow control device (25).

10. The adsorption dryer according to claim 8, characterized in that The nitrogen or oxygen generation system (12) is connected to a solenoid valve control device (27), which is connected to a PLC integrated control system.

Images