PSA (Pressure Swing Adsorption) treatment system capable of improving hydrogen conversion rate

Abstract

The utility model discloses a PSA (Pressure Swing Adsorption) treatment system capable of improving hydrogen conversion rate, which relates to the technical field of petrochemical industry, and comprises a dry gas inlet pipeline, a hydrogen compressor, a PSA device, a circulation header pipe used for communicating the hydrogen compressor and the PSA device, and the circulation header pipe is divided into a first circulation branch pipe and a second circulation branch pipe at the rear end of the PSA device, the tail end of the first circulation branch pipe is connected with a high-purity hydrogen tank, and the tail end of the second circulation branch pipe is connected with a desorption gas compressor; the desorption gas compressor is backwards connected with a flow dividing main pipe, the flow dividing main pipe extends backwards and is divided into a first flow dividing branch pipe and a second flow dividing branch pipe, and the two flow dividing branch pipes are each provided with a control valve used for controlling gas flow. On the basis of the prior art, through simple connection improvement between pipelines, the hydrogen conversion rate can be greatly improved, the hydrogen conversion rate device has the advantages of being low in investment cost, short in construction period and simple in procedure, meanwhile, cost can be reduced, efficiency can be improved, and the device is helpful for building a green factory.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical industry, in particular to a PSA processing system capable of improving the hydrogen conversion rate. Background Art

[0002] The PSA device is a common gas separation technology and is widely used in the gas processing process of the petrochemical industry. It is usually used to separate and purify gases such as hydrogen, nitrogen and methane. The working principle of the PSA device is to use adsorbents to adsorb certain components in the gas under different pressures, thereby achieving the separation of different gas components. Traditional propane dehydrogenation units are generally equipped with PSA devices. The product gas is passed through a cold box to obtain dry gas, which generally contains 92% hydrogen components. The dry gas is further purified by the PSA device. Part of the purified high-purity hydrogen is used as a catalyst reducing agent in the reactor, and the rest is used as a raw material for downstream manufacturing of chemical products such as hydrogen peroxide and maleic anhydride method BDO.

[0003] In order to improve the dry gas to hydrogen conversion rate, the traditional method is to adjust the pressure swing adsorption time control or install another PSA unit at the end of the PSA unit for secondary purification to achieve efficient use of hydrogen. However, if a new PSA is built in a factory, it is expensive, occupies a large area, has a long construction period, and requires a series of complicated procedures such as safety assessment and environmental assessment, which is not practical.

[0004] In order to solve this problem, the utility model proposes a PSA processing system capable of improving the hydrogen conversion rate. Utility Model Content

[0005] (1) Technical issues to be solved

[0006] The utility model aims at the above-mentioned problems in the prior art and, in order to make up for the deficiencies of the prior art, provides a PSA processing system which can be reasonably manufactured and used and can improve the hydrogen conversion rate.

[0007] (2) Technical solution

[0008] In order to achieve the above technical objectives, the utility model provides a PSA processing system capable of improving the hydrogen conversion rate, comprising a dry gas inlet pipeline, the dry gas inlet pipeline is connected to a hydrogen compressor, a PSA device is connected to the rear of the hydrogen compressor, a circulation main pipe is used to connect the hydrogen compressor and the PSA device, the circulation main pipe is divided into a first circulation branch pipe and a second circulation branch pipe at the rear end of the PSA device, the end of the first circulation branch pipe is connected to a high-purity hydrogen tank, and the end of the second circulation branch pipe is connected to a desorption gas compressor;

[0009] The analytical gas compressor is connected to a branch main pipe at the rear, and the branch main pipe extends backward and forks into a first branch branch pipe and a second branch branch pipe. A first control valve is provided on the first branch branch pipe, and a second control valve is provided on the second branch branch pipe. The end of the second branch branch pipe is connected to the air inlet end of the dry gas inlet pipe. A connecting pipe is also externally connected between the first branch branch pipe and the second branch branch pipe, and the connecting pipe is controlled by the first control valve and the second control valve at the same time.

[0010] Preferably, both the first circulation branch pipe and the second circulation branch pipe are provided with an electric control valve for controlling the flow of gas, so as to facilitate the control of the first circulation branch pipe and the second circulation branch pipe respectively.

[0011] Preferably, the first branch pipe is externally connected to the use end, that is, this part of the gas can be directly used at each customer's use end.

[0012] Preferably, the high-purity hydrogen tank is externally connected to the user end, that is, this part of the gas can be directly used for each customer's user end.

[0013] Preferably, an online hydrogen purity analyzer is provided at the front end of the high-purity hydrogen tank.

[0014] Preferably, an online hydrogen purity analyzer for detecting the purity of hydrogen is also provided at the tail end of the analytical gas compressor.

[0015] (3) Beneficial effects

[0016] The utility model can avoid the cost and floor space problems caused by re-installing the PSA device for purification through simple technical improvements on the basis of the existing technology. By improving the connection between the pipelines, the hydrogen conversion rate can be greatly improved. In addition, it has the advantages of low investment cost, short construction period and simple procedures. At the same time, it can reduce costs and increase efficiency to help build a green factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 It is the overall connection schematic diagram of the utility model;

[0019] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of part A.

[0020] The figures are marked as follows: 1-dry gas inlet pipeline, 2-hydrogen compressor, 3-PSA device, 4-circulation main pipe, 41-first circulation branch pipe, 42-second circulation branch pipe, 5-high-purity hydrogen tank, 6-analysis gas compressor, 7-diversion main pipe, 71-first diversion branch pipe, 72-second diversion branch pipe, 8-first control valve, 9-second control valve, 10-connecting pipe. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Example:

[0023] See also Figure 1-2 As shown, t provides an embodiment of the utility model, a PSA processing system capable of improving the hydrogen conversion rate, specifically comprising a dry gas intake pipeline 1, the dry gas intake pipeline 1 is connected to a hydrogen compressor 2, a PSA device 3 is connected to the rear of the hydrogen compressor 2, a flow main pipe 4 is used to connect the hydrogen compressor 2 and the PSA device 3, and the flow main pipe 4 is divided into a first flow branch pipe 41 and a second flow branch pipe 42 at the rear end of the PSA device 3. In order to facilitate the control of the gas flow rate of the first flow branch pipe 41 and the second flow branch pipe 42 , the first circulation branch pipe 41 and the second circulation branch pipe 42 are both provided with an electric control valve for controlling the flow of gas, the end of the first circulation branch pipe 41 is connected to a high-purity hydrogen tank 5, and the high-purity hydrogen tank 5 is externally connected to the use end, and the purity of the hydrogen needs to be tested before use, so as to control whether it is purified again; similarly, the end of the second circulation branch pipe 42 is connected to a decomposition gas compressor 6, and the first branch pipe 71 is externally connected to the use end, and the purity of the hydrogen needs to be tested before use, so as to control whether it is purified again;

[0024] The analytical gas compressor 6 is connected to a branch main pipe 7 at the rear, and the branch main pipe 7 extends backward and forks into a first branch branch pipe 71 and a second branch branch pipe 72. A first control valve 8 is provided on the first branch branch pipe 71, and a second control valve 9 is provided on the second branch branch pipe 72. The end of the second branch branch pipe 72 is connected to the inlet end of the dry gas inlet pipe 1, which is convenient for re-purification of the gas and effectively improves the conversion rate of hydrogen. A connecting pipe 10 is also externally connected between the first branch branch pipe 71 and the second branch branch pipe 72. The connecting pipe 10 is controlled by the first control valve 8 and the second control valve 9 at the same time, achieving the effect of a three-way connection and better controlling the gas flow direction.

[0025] During the use of the utility model, if the attached Figure 1As shown, the gas is first filled into the pipeline through dry gas, and then the gas enters the hydrogen compressor and then enters the PSA device. Finally, after passing the purity test, the gas is opened through the electric control valve to allow the gas to go to the high-purity hydrogen tank (which is then supplied to the user end for use) or enter the analytical gas compressor. The tail end of the analytical gas compressor is also provided with an online hydrogen purity analyzer for detecting the purity of hydrogen. The first control valve or the second control valve is opened by knowing the purity of the hydrogen. If the first control valve is opened and closed, the gas will be transmitted to the outside and finally delivered to the user end for use; if the first control valve is closed and the second control valve is opened, it means that the gas needs to return to the system for purification. Finally, the gas enters the pipeline from the dry gas again to perform the above-mentioned purification operation again, thereby improving the conversion rate of hydrogen. It should be noted that the device can also be applied to the operation of related gas purification, not only limited to the hydrogen purification process, if the same method is used for purification, it should also be included in the protection scope of this scheme.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A PSA processing system capable of improving hydrogen conversion rate, characterized in that: The invention comprises a dry gas inlet pipeline (1), wherein the dry gas inlet pipeline (1) is connected to a hydrogen compressor (2), a PSA device (3) is connected to the rear of the hydrogen compressor (2), a circulation main pipe (4) is used to connect the hydrogen compressor (2) and the PSA device (3), and the circulation main pipe (4) is divided into a first circulation branch pipe (41) and a second circulation branch pipe (42) at the rear end of the PSA device (3), the end of the first circulation branch pipe (41) is connected to a high-purity hydrogen tank (5), and the end of the second circulation branch pipe (42) is connected to a desorption gas compressor (6); The analytical gas compressor (6) is connected to a main flow branch pipe (7) at the rear, and the main flow branch pipe (7) extends backward and forks to branch into a first flow branch pipe (71) and a second flow branch pipe (72). A first control valve (8) is provided on the first flow branch pipe (71), and a second control valve (9) is provided on the second flow branch pipe (72). The end of the second flow branch pipe (72) is connected to the air inlet end of the dry gas inlet pipeline (1). A connecting pipe (10) is also externally connected between the first flow branch pipe (71) and the second flow branch pipe (72), and the connecting pipe (10) is controlled by both the first control valve (8) and the second control valve (9).

2. A PSA processing system capable of improving hydrogen conversion rate according to claim 1, characterized in that: The first circulation branch pipe (41) and the second circulation branch pipe (42) are both provided with an electric control valve for controlling the flow of gas.

3. A PSA processing system capable of improving hydrogen conversion rate according to claim 1, characterized in that: The first flow branch pipe (71) is externally connected to the use end.

4. A PSA processing system capable of improving hydrogen conversion rate according to claim 1, characterized in that: The high-purity hydrogen tank (5) is externally connected to a use end.

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