Method for improving displacement airtight efficiency of pressure swing adsorption system

Abstract

The invention provides a method for improving the replacement airtight efficiency of a pressure swing adsorption system, and relates to the technical field of gas separation. The specific method comprises the following steps: preparing a medium-pressure nitrogen pipeline, wherein the medium-pressure nitrogen pipeline is connected with a spray guide valve at a process gas inlet of the pressure swing adsorption system; the pressure swing adsorption system is improved, nitrogen with higher pressure is conveyed by configuring the medium-pressure nitrogen DN25 pipeline, the airtight waiting time after system maintenance is shortened, the airtight replacement efficiency is improved, and meanwhile waste of process gas is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of gas separation, and in particular to a method for improving the replacement gas-tightness efficiency of a pressure swing adsorption system. Background Art

[0002] The inlet of the PSA pressure swing adsorption system is provided with a process gas inlet. In the prior art, only low-pressure nitrogen is introduced into the process gas inlet, and the low-pressure nitrogen is used to replace the process of the system after the system is overhauled. However, when the system is airtight, the high-pressure system pressure must be filled to 5.3MPa for airtightness test after the process gas of the previous system is qualified. This low-pressure nitrogen cannot meet the pressure requirements, which prolongs the system start-up time and reduces the replacement airtightness efficiency. In addition, the repeated filling and release of process gas during the airtightness process also causes waste of process gas. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the present invention provides a method for improving the replacement airtightness efficiency of a pressure swing adsorption system, which solves the technical problem that the low-pressure nitrogen in the existing PSA pressure swing adsorption system cannot meet the pressure requirements, prolongs the system start-up time, and causes waste of process gas.

[0005] (II) Technical solution

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The method for improving the displacement airtightness efficiency of the pressure swing adsorption system is specifically to equip a medium-pressure nitrogen pipeline, wherein the medium-pressure nitrogen pipeline is connected to the shower valve at the process gas inlet of the pressure swing adsorption system.

[0008] Preferably, the specific method of equipping the medium-pressure nitrogen pipeline is: equip the first tee after the nitrogen main valve to lead out a medium-pressure nitrogen DN25 pipeline.

[0009] Preferably, a DN25,600LB valve is added before the medium-pressure nitrogen DN25 pipeline is led out.

[0010] Preferably, the medium-pressure nitrogen DN25 pipeline and the shower valve are connected by a flange.

[0011] Preferably, an inlet valve is provided at the inlet of the medium-pressure nitrogen DN25 pipeline, and a second tee is provided between the pipeline after the inlet valve and the shower valve to lead out a new shower.

[0012] Preferably, two DN25,600LB valves are sequentially provided on the pipeline between the second tee and the inlet valve, and a one-way valve is provided after the second DN25,600LB valve.

[0013] Preferably, a DN25,600LB "8" shaped blind plate is additionally provided between the two DN25,600LB valves.

[0014] (III) Beneficial effects

[0015] The present invention provides a method for improving the displacement airtightness efficiency of a pressure swing adsorption system. Compared with the prior art, the method has the following beneficial effects:

[0016] The present invention improves the pressure swing adsorption system by configuring a medium-pressure nitrogen DN25 pipeline to transport nitrogen at a higher pressure, thereby reducing the airtight waiting time after system maintenance, improving the replacement airtight efficiency, and avoiding waste of process gas.

[0017] After the improvement, the airtight waiting time of the pressure swing adsorption system after maintenance is about 8 hours, and the effective gas discharge volume at the start-up is 30KNm 3 / hour calculation, the effective gas discharge volume in 8 hours is about 240KNm 3 The effective gas cost of the second phase is 1316.15 yuan / KNm 3 , saving approximately RMB 315,800. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The embodiment of the present application provides a method for improving the replacement airtightness efficiency of the pressure swing adsorption system, thereby solving the technical problem that the low-pressure nitrogen in the existing PSA pressure swing adsorption system cannot meet the pressure requirements, prolongs the system start-up time, and causes waste of process gas.

[0020] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with specific implementation methods.

[0021] Example:

[0022] The method for improving the displacement airtightness efficiency of the pressure swing adsorption system is as follows:

[0023] The first tee is installed behind the nitrogen main valve to lead out a medium-pressure nitrogen DN25 pipeline. A DN25,600LB valve is added before the medium-pressure nitrogen DN25 pipeline is led out to control the gas flow. An inlet valve is installed at the inlet of the medium-pressure nitrogen DN25 pipeline. A second tee is installed between the pipeline after the inlet valve and the drain valve to lead out a new drain. The outlet is connected to the drain valve of the process gas inlet of the pressure swing adsorption system through a flange. Increasing the pressure of the nitrogen introduced is conducive to reducing the waiting time for airtightness after system maintenance and improving the efficiency of replacement airtightness.

[0024] Two DN25,600LB valves are added in sequence on the pipeline between the second tee and the inlet valve, and a DN25,600LB "8" blind plate is added between the two DN25,600LB valves. A check valve is provided after the second DN25,600LB valve.

[0025] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention improves the pressure swing adsorption system by configuring a medium-pressure nitrogen DN25 pipeline to transport nitrogen at a higher pressure, thereby reducing the airtight waiting time after system maintenance, improving the replacement airtight efficiency, and avoiding waste of process gas.

[0027] After the improvement, the airtight waiting time of the pressure swing adsorption system after maintenance is about 8 hours, and the effective gas discharge volume at the start-up is 30KNm 3 / hour calculation, the effective gas discharge volume in 8 hours is about 240KNm 3 The effective gas cost of the second phase is 1316.15 yuan / KNm 3 , saving approximately RMB 315,800.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0029] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for improving the displacement airtightness efficiency of a pressure swing adsorption system, characterized in that: Specifically: a medium-pressure nitrogen pipeline is equipped, and the medium-pressure nitrogen pipeline is connected to the shower valve at the process gas inlet of the pressure swing adsorption system.

2. The method for improving the displacement airtightness efficiency of a pressure swing adsorption system according to claim 1, characterized in that: The specific method of equipping the medium-pressure nitrogen pipeline is as follows: equip the first tee after the nitrogen main valve to lead out a medium-pressure nitrogen DN25 pipeline.

3. The method for improving the displacement airtightness efficiency of a pressure swing adsorption system according to claim 2, characterized in that: A DN25,600LB valve is added before the medium-pressure nitrogen DN25 pipeline is led out.

4. The method for improving the displacement airtightness efficiency of a pressure swing adsorption system according to claim 2, characterized in that: The medium-pressure nitrogen DN25 pipeline and the shower valve are connected by a flange.

5. The method for improving the displacement airtightness efficiency of a pressure swing adsorption system according to claim 2, characterized in that: An inlet valve is provided at the inlet of the medium-pressure nitrogen DN25 pipeline, and a second tee is provided between the pipeline after the inlet valve and the shower valve to lead out a new shower.

6. The method for improving the displacement airtightness efficiency of a pressure swing adsorption system according to claim 5, characterized in that: Two DN25,600LB valves are sequentially installed on the pipeline between the second tee and the inlet valve, and a one-way valve is installed after the second DN25,600LB valve.

7. The method for improving the displacement airtightness efficiency of a pressure swing adsorption system according to claim 6, characterized in that: A DN25,600LB "8" shaped blind plate is added between the two DN25,600LB valves.