CN212492235U

CN212492235U - Valve dynamic loss detection system of PSA (pressure swing adsorption) air separation plant

Info

Publication number: CN212492235U
Application number: CN202020521075.5U
Authority: CN
Inventors: 刘秋平
Original assignee: Zhejiang Chenfan Technology Co Ltd
Current assignee: Zhejiang Chenfan Technology Co Ltd
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2021-02-09
Anticipated expiration: 2030-04-10

Abstract

The utility model relates to a PSA air separation plant valve moves and decreases detecting system, including first adsorption tower and second adsorption tower, the bottom of first adsorption tower and second adsorption tower is provided with first drain and second drain, first drain department is provided with first sampling valve, second drain department is provided with second sampling valve, first sampling valve and second sampling valve are connected with PLC controller signal processing unit, be provided with A tower pressure signal transmitter and B tower pressure signal transmitter respectively between PLC controller signal processing unit and first sampling valve and the second sampling valve, be connected through the pressure sampling pipe between first sampling valve and the A tower pressure signal transmitter, be connected through the pressure sampling pipe between second sampling valve and the B tower pressure signal transmitter, PLC controller signal processing unit is connected with the display, the display is used for displaying the pressure curve.

Description

Valve dynamic loss detection system of PSA (pressure swing adsorption) air separation plant

Technical Field

The utility model belongs to pressure swing adsorption nitrogen and oxygen making equipment field, in particular to PSA air separation plant valve moves and decreases detecting system.

Background

The pressure swing adsorption nitrogen and oxygen production is a new type adsorption regeneration filler, and utilizes the physical process of isothermal pressure swing adsorption regeneration (PSA for short), and utilizes the gas separation produced by different adsorption capacities of different components in gas medium on the adsorbent, and the adsorbent can make selective adsorption when its pressure is raised, and can obtain desorption regeneration when its pressure is reduced or its pressure is reduced. Therefore, when the pressure in the tower body is increased and decreased by the double tower or the multiple towers, the judgment on whether the PSA nitrogen and oxygen production equipment is in normal operation is made.

At present, in the field of PSA (pressure swing adsorption) nitrogen and oxygen production, a plurality of valve assemblies are commonly used for realizing pressure switching required by each adsorption regeneration, and the normal operation of the valve assemblies is necessary for the normal operation of complete equipment.

Taking a set of PSA nitrogen generating units as an example, the number of valves of the PSA nitrogen generating unit includes 8 valves, 9 valves, 10 valves, 11 valves, 12 valves, etc. due to the difference between the process and the gas yield, however, the nitrogen generating process composed of these valves is to ensure that the carbon molecular sieve in the nitrogen generating and oxygen generating apparatus will be adsorbed or regenerated along with the change of pressure.

The carbon molecular sieve in the container has different adsorption capacity to the adsorbed gas under different pressures, and the pressure is reduced to make the carbon molecular sieve release the adsorption of oxygen, and the process is called regeneration. Pressure swing adsorption processes typically employ two columns in parallel, with alternating pressure adsorption and decompression regeneration to obtain a continuous nitrogen stream.

In conclusion, when the pressure swing adsorption oxygen generation and generation equipment is actually operated, the starting of the equipment is crucial to the normal operation of each valve of the equipment. Whether the valve is operated reliably will determine the important role of the device in starting the whole gas production.

From the above, PSA nitrogen and oxygen generating units usually have a plurality of independent valves, and through mutual logical cooperation, form a complete action system to realize the switching between adsorption and regeneration in the adsorption tower of the nitrogen and oxygen generating unit.

However, it is difficult for technicians, both for the user of the equipment and for the manufacturer of the equipment, to accurately determine whether the valves of the equipment are operating correctly. When the device has phenomena such as purity reduction, flow rate not meeting the requirement, insufficient gas supply pressure of the finished gas and the like, whether the action of a certain valve is normal or good is difficult to judge.

When such a failure occurs, a person with a lot of experience in the field of the device is often required to determine the specific damage (dynamic damage) condition of the valve. Both the user of the equipment and the manufacturer of the equipment have certain difficulties, which also puts higher demands on the equipment manufacturer.

Disclosure of Invention

In view of this, to foretell weak point, the utility model provides a PSA air separation plant valve moves and decreases detecting system in order to solve above-mentioned problem.

In order to realize above purpose, the utility model provides a PSA air separation plant valve moves and decreases detecting system, including first adsorption tower and second adsorption tower, first adsorption tower with be provided with a plurality of valves between the second adsorption tower, the bottom of first adsorption tower and second adsorption tower is provided with first drain and second drain, its characterized in that: first drain outlet department is provided with first sampling valve, second drain outlet department is provided with second sampling valve, first sampling valve and second sampling valve are connected with PLC controller signal processing unit, be provided with A tower pressure signal changer and B tower pressure signal changer between PLC controller signal processing unit and first sampling valve and the second sampling valve respectively, be connected through the pressure sampling pipe between first sampling valve and the A tower pressure signal changer, be connected through the pressure sampling pipe between second sampling valve and the B tower pressure signal changer, PLC controller signal processing unit is connected with the display, be used for showing the pressure curve on the display.

The utility model discloses further set up: and the PLC signal processing unit is connected with the tower A pressure signal transmitter and the tower B pressure signal transmitter through electric quick aviation plugs.

The utility model has the advantages that: in the PSA nitrogen and oxygen production equipment, the bottom of the adsorption tower is provided with a sewage draining outlet, the condition of pressure change in the adsorption tower can be temporarily detected through the sewage draining outlet, and the sewage draining outlet plays a role in draining sewage when the equipment normally runs; when a valve of the device is suspected of malfunctioning, a complete pressure curve can be established through this port. Therefore, the utility model discloses supporting PSA valve moves and decreases quick detector uses suitable pressure sensing changer, gets off the effectual record of the pressure variation value in the tower. The two pressure transmitters are arranged, the front end of the two pressure transmitters is provided with a quick pressure connecting pipe, and pressure connection in the tower can be quickly carried out. The valve dynamic loss condition is quickly searched by connecting the pressure of a drain outlet at the bottom of the adsorption tower, recording a pressure change curve and contrasting a dynamic loss curve chart.

Drawings

FIG. 1 is a schematic diagram of a pressure swing adsorption nitrogen and oxygen production apparatus in the prior art of the present invention.

Fig. 2 is a graph of the pressure change of the double-tower structure of the present invention.

Fig. 3 is a schematic diagram of the double-tower pressure curve of the non-tight damage failure of the valve No. 1 of the present invention.

Fig. 4 is the utility model discloses the damage trouble when No. 1 valve is malfunctioning opens entirely, its two tower pressure curve schematic diagrams.

Fig. 5 is a schematic structural diagram of an embodiment of the present invention.

Figure 6 is the utility model discloses a PSA valve moves and decreases quick detector schematic diagram.

Reference numerals: 1. a first adsorption tower; 2. a second adsorption column; 3. a valve; 4. a first drain port; 5. a second sewage draining outlet; 6. a first sampling valve; 7. a second sampling valve; 8. a PLC controller signal processing unit; 9. a tower pressure signal transmitter; 10. a tower B pressure signal transmitter; 11. a display; 12. an electrical quick aviation plug; 13. a pressure sampling tube.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

When the pressure swing adsorption nitrogen and oxygen production equipment shown in figure 1 is adopted, the valves 3 arranged in the equipment are separately arranged and are controlled by a set of controller. When in control, the control of each valve 3 is controlled by a separate air pipe and an electric control line

In actual operation, the valve 3 will perform effective switching control according to the logic of the controller, and the pressure change in the double tower structure of the equipment will form two similar double parabolas as shown in fig. 2.

Assuming valve 3 # 1 is associated with an untight failure, the double column pressure curve will show a double pressure curve as in fig. 3.

Assuming a failure at full opening for valve 3 # 1, the double column pressure curve would show a double pressure curve as in fig. 4. As shown in fig. 3 and 4, when an abnormal phenomenon occurs in the valve 3, the corresponding pressure curve of the double column changes accordingly.

From the above, the pressure change of the double-tower or multi-tower pressure swing adsorption nitrogen and oxygen making unit can be deduced to be the damage condition of the specific valve 3.

Therefore, the utility model adopts the following technical scheme:

as shown in fig. 5-6, the utility model relates to a valve dynamic damage detection system of PSA air separation plant, comprising a first adsorption tower 1 and a second adsorption tower 2, a plurality of valves 3 are arranged between the first adsorption tower 1 and the second adsorption tower 2, the bottoms of the first adsorption tower 1 and the second adsorption tower 2 are provided with a first sewage discharge outlet 4 and a second sewage discharge outlet 5, a first sampling valve 63 is arranged at the first sewage discharge outlet 4, a second sampling valve 73 is arranged at the second sewage discharge outlet 5, the first sampling valve 63 and the second sampling valve 73 are connected with a PLC controller signal processing unit 8, an a tower pressure signal transmitter 9 and a B tower pressure signal transmitter 10 are respectively arranged between the PLC controller signal processing unit 8 and the first sampling valve 63 and the second sampling valve 73, the first sampling valve 63 and the a tower pressure signal transmitter 9 are connected through a pressure sampling pipe 13, the second sampling valve 73 is connected with the B tower pressure signal transmitter 10 through a pressure sampling tube 13, the PLC controller signal processing unit 8 is connected with a display 11, and the display 11 is used for displaying a pressure curve. The PLC signal processing unit 8 is connected with the A tower pressure signal transmitter 9 and the B tower pressure signal transmitter 10 through an electric quick aviation plug 12.

According to the technical scheme, when different pressure curves are displayed on the display 11, the specific state of the valve 3 can be determined through comparison data; the method is mainly aimed at establishing a complete valve 3 process system of the PSA nitrogen and oxygen production equipment, establishing an action condition of the valve 3 and a double-tower pressure curve chart in normal operation under each valve 3 system, establishing a pressure curve change chart under the condition that each valve 3 of the complete PSA nitrogen and oxygen production equipment is abnormal, and the like under the condition that the valve 3 is not switched, internally leaked, and switched and fixed. Besides, a large database and a valve 3 dynamic damage detection software platform can be established, so that the condition of the valve 3 can be rapidly determined and damaged, and the healthy running state of the equipment can be reflected in time. The self-judgment capability of the equipment is really realized, and intelligent control and intelligent operation are realized.

It should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a PSA air separation plant valve moves decreases detecting system, includes first adsorption tower and second adsorption tower, first adsorption tower with be provided with a plurality of valves between the second adsorption tower, the bottom of first adsorption tower and second adsorption tower is provided with first drain and second drain, its characterized in that: first drain outlet department is provided with first sampling valve, second drain outlet department is provided with second sampling valve, first sampling valve and second sampling valve are connected with PLC controller signal processing unit, be provided with A tower pressure signal changer and B tower pressure signal changer between PLC controller signal processing unit and first sampling valve and the second sampling valve respectively, be connected through the pressure sampling pipe between first sampling valve and the A tower pressure signal changer, be connected through the pressure sampling pipe between second sampling valve and the B tower pressure signal changer, PLC controller signal processing unit is connected with the display, be used for showing the pressure curve on the display.

2. The system of claim 1, wherein the valve dynamic loss detection system comprises: and the PLC signal processing unit is connected with the tower A pressure signal transmitter and the tower B pressure signal transmitter through electric quick aviation plugs.