An air drying device using surplus air from a nitrogen supply device

Abstract

The utility model discloses an air drying device of surplus air with nitrogen supply device, including the main cold and condenser evaporimeter who is connected with the oxygen -enriched air pipeline, and the oxygen -enriched air pipeline is connected with the purifier regenerating pipeline and purifier blow -off pipeline respectively through the three -way valve, and the oxygen -enriched air pipeline is connected with drying -machine blow -off pipeline and vent valve before the three -way valve, and the purifier regenerating pipeline is connected with cooler, regenerator, heater and purifier in proper order, and the regenerator is connected with air compressor high -temperature gas pipeline, and the cooler is connected to circulating water pool through circulating water inlet pipeline and circulating water outlet pipeline respectively. The utility model avoids the loss of the original air drying machine blow -off gas, makes air drying machine blow -off effect improve greatly, and the purifier regenerating gas carries out heat exchange with the circulating water pool needing temperature reduction through cooler, reduces circulating water temperature, reduces circulating water system work load, and will regenerating gas temperature improve, reduces the power consumption of heater, and reduces enterprise energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of air drying device technology, and in particular to an air drying device that uses a nitrogen supply device to provide surplus air. Background Technology

[0002] Currently, existing air separation nitrogen generation systems include air separation towers, purifiers, three-way valves, regenerators, vent valves, and vent pipelines. In these systems, oxygen-enriched liquid air exchanges heat with nitrogen in the condenser-evaporator, vaporizing into oxygen-enriched air. This oxygen-enriched liquid air is then used to provide regeneration and cooling air to the purifier via the three-way valve. However, excess air needs to be vented through valve V124 to maintain the gas balance in the nitrogen generation system. Existing air drying devices include air compressors, waste heat dryers, vent valves, and pipelines. In these devices, the air compressor compresses air to 0.65 MPa and delivers it to the waste heat dryer, where alumina adsorbs moisture from the air, producing dry air for the customer.

[0003] However, the existing technology has the following shortcomings: the excess air in the air separation nitrogen generation system is directly vented, resulting in the failure to utilize its dry and low-temperature characteristics, which leads to resource waste; the adsorption cylinder of the dryer equipped with the air drying device needs to be activated at high temperature, and the steps include regeneration and cooling. Regeneration directly utilizes the high temperature of the air compressor outlet, but cooling requires a portion of the treated air to be throttled and depressurized before being used to cool the adsorption cylinder. The cooling air is directly vented through the vent valve, which causes a portion of the dryer to lose energy, with the energy loss being about 5%. Utility Model Content

[0004] To address the technical problems of existing air separation nitrogen generation systems where excess air is directly vented, resulting in resource waste, and air drying devices where cold air is directly vented through vent valves, causing energy loss in the dryer, this utility model provides the following technical solution.

[0005] This utility model discloses an air drying device using excess air from a nitrogen supply unit, comprising a main cooler and a condenser-evaporator connected to an oxygen-enriched air pipeline. The oxygen-enriched air pipeline is connected to a purifier regeneration pipeline and a purifier cooling pipeline via a three-way valve. Before the three-way valve, the oxygen-enriched air pipeline is connected to a dryer cooling pipeline and a vent valve. The purifier regeneration pipeline is sequentially connected to a cooler, a regenerator, a heater, and the purifier. The regenerator is connected to a high-temperature air pipeline from an air compressor. The cooler is connected to a circulating water tank via an inlet circulating water pipeline and an outlet circulating water pipeline.

[0006] As a further technical solution, the air dryer cooling pipeline is connected to an air dryer with an air compressor air supply pipeline on one side, and the air dryer is connected to a user pipeline and a second vent pipeline.

[0007] As a further technical solution, the air dryer is connected to a circulating cooling pipeline that is connected to the dryer cooling pipeline.

[0008] As a further technical solution, the purifier is provided with a first vent line.

[0009] As a further technical solution, the regenerator is connected to the air separation system.

[0010] As a further technical solution, the circulating water pool is connected to the circulating water system cooling tower.

[0011] The beneficial effects of this invention are as follows: This invention utilizes the surplus low-temperature, dry, oxygen-enriched air vented from the nitrogen supply unit in an air drying unit, avoiding the losses from the original air dryer's cooling air. The low temperature and low moisture content of the oxygen-enriched air significantly improve the cooling effect of the air dryer, resulting in better air quality after adsorption and enhanced regeneration efficiency. Simultaneously, the regeneration gas pipeline is modified by adding a cooler after the three-way valve to exchange heat with the circulating water tank requiring cooling. This lowers the circulating water temperature, reduces the workload of the cooling tower in the circulating water system, and increases the regeneration gas temperature, reducing the power consumption of the heater before the purifier and lowering the company's energy consumption. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the air drying device with excess air using a nitrogen supply device according to this utility model; In the diagram: 1-Condenser / Evaporator; 2-Main Cooler; 3-Three-way Valve; 4-Cooler; 5-Circulating Water Tank; 6-Regenerator; 7-Heater; 8-Purifier; 9-Air Dryer; 10-Vent Valve; a-Dryer Cooling Pipeline; b-Purifier Regeneration Pipeline; c-Purifier Cooling Pipeline; d-Inlet Circulating Water Pipeline; e-Outlet Circulating Water Pipeline; f-High-Temperature Air Pipeline of Air Compressor; g-Circulating Cooling Pipeline; h-User Pipeline; j-First Vent Pipeline; k-Second Vent Pipeline; m-Air Inlet Pipeline of Air Compressor; n-Oxygen-Enriched Air Pipeline. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0014] In the description of this utility model, it should be understood that the terms "upper" and "lower" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0015] like Figure 1 As shown, this utility model discloses an air drying device using surplus air from a nitrogen supply device. It includes a main cooler 2 connected to an oxygen-enriched air pipeline n and a condenser-evaporator 1. The condenser-evaporator 1 is the condenser-evaporator of the nitrogen supply device. Liquid oxygen-enriched air in the condenser-evaporator 1 exchanges heat with nitrogen, vaporizing the liquid oxygen-enriched air into gaseous oxygen-enriched air. The vaporized oxygen-enriched air after passing through the main cooler 2 is discharged into the oxygen-enriched air pipeline n, and then provides regeneration gas and cooling air to the purifier 8, cools the circulating water tank 5, and provides cooling air to the air dryer 9.

[0016] In a preferred embodiment, the oxygen-enriched air pipeline n is connected to the purifier regeneration pipeline b and the purifier cooling pipeline c via a three-way valve 3. The purifier regeneration pipeline b provides purified regeneration gas to the purifier 8, and the purifier cooling pipeline c is connected to the purifier 8 to provide cooling gas. Simultaneously, the oxygen-enriched air pipeline n is connected to the dryer cooling pipeline a and the vent valve 10 before the three-way valve 3. The dryer cooling pipeline a provides the previously surplus vented oxygen-enriched air to the air dryer 9 of the air drying device for cooling, avoiding the loss of the original cooling gas in the air dryer 9. Furthermore, the low temperature and low moisture content of the oxygen-enriched air significantly improve the cooling effect of the air dryer 9, resulting in better air quality after adsorption by the air dryer 9 and enhancing its regeneration effect.

[0017] At this time, the air dryer cooling pipeline a is connected to the air dryer 9. The air dryer 9 has an air compressor supply pipeline m on one side. The outlet end of the air dryer 9 is connected to the user pipeline h and the second vent pipeline k. In order to improve the effective utilization of the cooling air, the air dryer 9 is connected to the circulating cooling pipeline g, which is connected to the air dryer cooling pipeline a. The circulating cooling pipeline g can circulate the low-temperature oxygen-rich air.

[0018] In a preferred embodiment, the purifier regeneration pipeline b is sequentially connected to a cooler 4, a regenerator 6, a heater 7, and a purifier 8. The regenerator 6 is connected to a high-temperature gas pipeline f of an air compressor, and the purifier 8 is equipped with a first vent pipeline j. The regenerator 6 is connected to an air separation system. The regenerated gas flowing through the purifier regeneration pipeline b exchanges heat with the cooler 4 to increase its temperature. When the heated regenerated gas passes through the regenerator 6 and the heater 7, it can reach the regenerated gas temperature required by the purifier 8 without the heater 7 needing to overheat, which can reduce the power consumption of the heater 7 and reduce the enterprise's energy consumption.

[0019] Meanwhile, the cooler 4 is connected to the circulating water pool 5 through the inlet circulating water pipeline d and the outlet circulating water pipeline e, respectively. The circulating water pool 5 is connected to the circulating water system cooling tower. The circulating water can be cooled down after exchanging heat with the regeneration gas in the cooler 4, which reduces the temperature of the circulating water in the circulating water pool 5. As a result, the working load of the circulating water system cooling tower can be reduced, the energy consumption of the enterprise can be reduced, and the economic benefits of the enterprise can be improved.

[0020] The preferred embodiments and examples of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, various changes or equivalent substitutions can be made without departing from the concept of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. An air drying device employing surplus air from a nitrogen supply unit, comprising a main cooler (2) and a condenser-evaporator (1) connected to an oxygen-enriched air pipeline (n), wherein the oxygen-enriched air pipeline (n) is connected to a purifier regeneration pipeline (b) and a purifier cooling pipeline (c) respectively via a three-way valve (3), characterized in that: The oxygen-enriched air pipeline (n) is connected to the dryer cooling pipeline (a) and the vent valve (10) before the three-way valve (3). The purifier regeneration pipeline (b) is connected to the cooler (4), the regenerator (6), the heater (7) and the purifier (8) in sequence. The regenerator (6) is connected to the air compressor high-temperature gas pipeline (f). The cooler (4) is connected to the circulating water pool (5) through the inlet circulating water pipeline (d) and the outlet circulating water pipeline (e).

2. The air drying device with surplus air supplied by a nitrogen supply device according to claim 1, characterized in that: The dryer cooling line (a) is connected to an air dryer (9) with an air compressor air supply line (m) on one side. The air dryer (9) is connected to a user line (h) and a second vent line (k).

3. The air drying device with surplus air supplied by a nitrogen supply device according to claim 2, characterized in that: The air dryer (9) is connected to a circulating cooling pipeline (g) that is connected to the air dryer cooling pipeline (a).

4. The air drying device with surplus air supplied by a nitrogen supply device according to claim 1, characterized in that: The purifier (8) is equipped with a first vent line (j).

5. The air drying device with surplus air supplied by a nitrogen supply device according to claim 1, characterized in that: The regenerator (6) is connected to the air separation system.

6. The air drying device with surplus air supplied by a nitrogen supply device according to claim 1, characterized in that: The circulating water tank (5) is connected to the circulating water system cooling tower.

Images