Hydrogen recovery device for refining unit of purified terephthalic acid device

Abstract

The utility model provides a hydrogen recovery device for a refining unit of a purified terephthalic acid device, which relates to the technical field of hydrogen recovery and comprises an operating panel, a generating device fixedly mounted at the top of the operating panel, two first air inlet pipes fixedly inserted into one side of the outer wall of the generating device, and a drying box fixedly mounted at the top of the operating panel. The output ends of the two first air inlet pipes communicate with the interior of the drying box. According to the hydrogen drying device, drying agents are placed on the multiple placing plates, the draught fan is started, generated gas with hydrogen enters the drying box along the two first gas inlet pipes, and then moisture in the hydrogen can be effectively removed under the action of the drying agents on the multiple placing plates; and secondly, through the action of two positioning grooves, two positioning strips and two handle holes, the drying agents on the ventilation frame and the multiple placement plates can be replaced, the subsequent removal efficiency of water in hydrogen is improved, and then the hydrogen recovery efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen recovery, in particular to a hydrogen recovery device for the refining unit of a purified terephthalic acid (PTA) plant. Background Art

[0002] The PTA plant consists of two production units: oxidation and refining. The task of the oxidation unit is to oxidize p-xylene (PX) to terephthalic acid (TA), and through crystallization, filtration separation, and drying, crude terephthalic acid (CTA) is obtained. CTA contains 4CBA (p-carboxybenzaldehyde), p-TA (p-toluic acid), and other impurities, which need to be purified and removed in the refining unit. The refining unit adopts a hydrorefining method to reduce 4CBA to p-TA. Since p-TA is soluble in water, through crystallization, filtration, and washing processes, p-TA acid is removed from TA. Another function of the hydrogenation reaction is to reduce the double bond of the colored group in the colored impurities to a single bond for decolorization.

[0003] In the prior art, a large amount of hydrogen generated in production is directly discharged into the air, which not only increases the problem of hydrogen resource waste but also causes unnecessary pollution to the environment. Therefore, a unit hydrogen recovery device is needed. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problem that when the existing equipment is in use, a large amount of hydrogen generated in production is directly discharged into the air, increasing the problem of hydrogen resource waste, and to propose a hydrogen recovery device for the refining unit of a purified terephthalic acid plant.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A hydrogen recovery device for the refining unit of a purified terephthalic acid plant, including an operation panel. A generating device is fixedly installed on the top of the operation panel. Two first air inlet pipes are fixedly inserted on one side of the outer wall of the generating device. A drying box is fixedly installed on the top of the operation panel, and the output ends of the two first air inlet pipes are both communicated with the inside of the drying box. Two positioning grooves are opened on the inner wall of the drying box. Positioning bars are movably inserted in the inner walls of the two positioning grooves. Pulling holes are opened on one side of the outer walls of the two positioning bars. An air-permeable frame is fixedly installed between one side of the outer walls of the two positioning bars. A plurality of placing plates are arranged on the inner wall of the air-permeable frame.

[0006] Preferably, a top plate is fixedly installed on the top of the drying box, and a second air inlet pipe is fixedly inserted on one side of the outer wall of the drying box.

[0007] Preferably, a filtering box is fixedly installed on the top of the operation panel, and the output end of the second air inlet pipe is communicated with the inside of the filtering box.

[0008] Preferably, an activated carbon plate is arranged between the inner walls of the filtering box.

[0009] Preferably, a top cover is fixedly installed on the top of the filtering box, and the outer wall of the second air inlet pipe is fixedly inserted into the inside of the top cover.

[0010] Preferably, a blower is fixedly installed on the top of the operation panel, and the input end of the blower is communicated with the inside of the filtering box.

[0011] Preferably, a collecting pipe is fixedly installed on one side of the outer wall of the blower, a collecting box is fixedly installed on the top of the operation panel, and the input end of the collecting pipe is communicated with the inside of the collecting box.

[0012] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:

[0013] 1. In the present utility model, desiccants (such as silica gel or molecular sieve) are placed on a plurality of placing plates. The blower is started, so that the generated hydrogen-containing gas enters the drying box along two first air inlet pipes. Then, through the action of the desiccants on the plurality of placing plates, the moisture in the hydrogen can be effectively removed. Secondly, through the action of two positioning grooves, two positioning strips and two handle holes, the breathable frame and the desiccants on the plurality of placing plates can be replaced, improving the subsequent removal efficiency of the moisture in the hydrogen, and further improving the recovery efficiency of the hydrogen.

[0014] 2. In the present utility model, after the hydrogen-containing gas passes through the drying box, it will enter the filtering box along the second air inlet pipe. And through the action of the activated carbon plate in the filtering box, the impurity gases (such as organic matters, sulfides, etc.) in the gas are effectively adsorbed, ensuring the purity of the recovered hydrogen. Then it enters the collecting box along the collecting pipe, further improving the recovery efficiency of the hydrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a perspective view of a hydrogen recovery device for the refining unit of a purified terephthalic acid plant proposed by the present utility model;

[0016] Figure 2 is a front view of a hydrogen recovery device for the refining unit of a purified terephthalic acid plant proposed by the present utility model;

[0017] Figure 3 is a partial exploded view of a hydrogen recovery device for the refining unit of a purified terephthalic acid plant proposed by the present utility model;

[0018] Figure 4 is a partial schematic view of a hydrogen recovery device for the refining unit of a purified terephthalic acid plant proposed by the present utility model.

[0019] Legend:

[0020] 1. Operating panel; 2. Generation device; 3. First intake pipe; 4. Drying oven; 5. Positioning groove; 6. Positioning strip; 7. Handle hole; 8. Ventilation frame; 9. Placing plate; 10. Top plate; 11. Second intake pipe; 12. Filter box; 13. Activated carbon plate; 14. Top cover; 15. Fan; 16. Collection pipe; 17. Collection box. Detailed implementation manner

[0021] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0022] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the present invention is not limited by the specific embodiments disclosed in the following specification.

[0023] Embodiment 1: As Figures 1 - 4 shown, the present invention provides a hydrogen recovery device for the refining unit of a purified terephthalic acid device, including an operating panel 1. A generation device 2 is fixedly installed on the top of the operating panel 1. Two first intake pipes 3 are fixedly inserted on one side of the outer wall of the generation device 2. A drying oven 4 is fixedly installed on the top of the operating panel 1. The output ends of the two first intake pipes 3 are both communicated with the inside of the drying oven 4. Two positioning grooves 5 are opened on the inner surface wall of the drying oven 4. Positioning strips 6 are movably inserted on the inner surface walls of the two positioning grooves 5. Handle holes 7 are opened on one side of the outer walls of the two positioning strips 6. A ventilation frame 8 is fixedly installed between the outer walls of the two positioning strips 6. A plurality of placing plates 9 are arranged on the inner surface wall of the ventilation frame 8.

[0024] The overall effect achieved by the entire Embodiment 1 is that when a series of reactions occur in the generation device 2 and hydrogen-containing gas is generated, at this time, the fan 15 installed on one side of the filter box 12 is started, so that the gas enters the drying oven 4 along the two first intake pipes 3. Since a plurality of placing plates 9 are arranged on the inner surface wall of the ventilation frame 8, and desiccants (such as silica gel or molecular sieve) are placed on each placing plate 9, the moisture in the hydrogen can be effectively removed. Secondly, two positioning grooves 5 are opened on the inner surface wall of the drying oven 4, and the positioning strips 6 installed on both sides of the ventilation frame 8 are movably inserted into the two positioning grooves 5. Therefore, through the handle holes 7 on the two positioning strips 6, the ventilation frame 8 can be taken out, and the desiccants on the plurality of placing plates 9 can be replaced, improving the subsequent drying effect of hydrogen, and thus improving the efficiency of hydrogen recovery.

[0025] Embodiment 2: As Figures 2 - 4As shown in the figure, a top plate 10 is fixedly installed on the top of the drying oven 4. A second intake pipe 11 is fixedly inserted on one side of the outer wall of the drying oven 4. A filter box 12 is fixedly installed on the top of the operation panel 1, and the output end of the second intake pipe 11 is communicated with the inside of the filter box 12. An activated carbon plate 13 is arranged between the inner walls of the filter box 12. A top cover 14 is fixedly installed on the top of the filter box 12, and the outer wall of the second intake pipe 11 is fixedly inserted into the inside of the top cover 14. A blower 15 is fixedly installed on the top of the operation panel 1, and the input end of the blower 15 is communicated with the inside of the filter box 12. A collecting pipe 16 is fixedly installed on one side of the outer wall of the blower 15. A collecting box 17 is fixedly installed on the top of the operation panel 1, and the input end of the collecting pipe 16 is communicated with the inside of the collecting box 17.

[0026] The overall effect achieved by the entire Embodiment 2 is that when the gas containing hydrogen passes through the drying oven 4, the gas will enter the filter box 12 along the second intake pipe 11. Since the activated carbon plate 13 is arranged on the inner wall of the filter box 12, the activated carbon plate 13 can be replaced, and the regular replacement of the activated carbon plate 13 can maintain its best adsorption capacity, reduce the decline of adsorption performance caused by saturation, so as to effectively adsorb the impurity gases (such as organic substances, sulfides, etc.) in the gas, and enter the collecting box 17 along the collecting pipe 16, ensuring the purity of the hydrogen recovery, and thus improving the use effect of the hydrogen recovery device.

[0027] Working principle: First, start the blower 15, so that the gas containing hydrogen generated in the generating device 2 enters the drying oven 4 along the two first intake pipes 3. Since the two positioning strips 6 installed on both sides of the air-permeable frame 8 are inserted into the two positioning grooves 5 opened on the inner wall of the drying oven 4, and then a plurality of placement plates 9 are arranged on the inner wall of the air-permeable frame 8, and a desiccant (such as silica gel or molecular sieve) is placed on each placement plate 9. Thus, through the action of the desiccant, the moisture in the hydrogen can be effectively removed, and the air-permeable frame 8 can be easily taken out through the two handle holes 7 opened on the two positioning strips 6, and then the desiccant can be replaced to improve the subsequent drying effect. Secondly, the dried gas will enter the filter box 12 along the second intake pipe 11. Since the activated carbon plate 13 is arranged on the inner wall of the filter box 12, and the activated carbon plate 13 can also be replaced, the impurity gases (such as organic substances, sulfides, etc.) in the gas can be effectively adsorbed, and then the hydrogen enters the collecting box 17 along the collecting pipe 16, ensuring the purity of the hydrogen recovery. Generally speaking, through the drying and filtering of hydrogen, the purity of hydrogen recovery can be improved, hydrogen resources will not be wasted, and the environment will not be polluted, thus improving the use effect of the unit hydrogen recovery device.

[0028] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as they do not depart from the technical solution content of the present utility model, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A hydrogen recovery device for the refining unit of a purified terephthalic acid plant, comprising an operation panel (1), characterized in that: A generating device (2) is fixedly installed at the top of the operation panel (1). Two first air inlet pipes (3) are fixedly inserted on one side of the outer wall of the generating device (2). A drying box (4) is fixedly installed at the top of the operation panel (1), and the output ends of the two first air inlet pipes (3) are both communicated with the inside of the drying box (4). Two positioning grooves (5) are formed on the inner wall of the drying box (4). Positioning strips (6) are movably inserted on the inner walls of the two positioning grooves (5). Pulling holes (7) are formed on one side of the outer walls of the two positioning strips (6). A ventilation frame (8) is fixedly installed between one side of the outer walls of the two positioning strips (6). A plurality of placing plates (9) are arranged on the inner wall of the ventilation frame (8).

2. The hydrogen recovery device for the purification unit of a purified terephthalic acid plant according to claim 1, characterized in that: A top plate (10) is fixedly installed at the top of the drying box (4). A second air inlet pipe (11) is fixedly inserted on one side of the outer wall of the drying box (4).

3. The hydrogen recovery device for the purification unit of a purified terephthalic acid plant according to claim 2, wherein: A filtering box (12) is fixedly installed at the top of the operation panel (1), and the output end of the second air inlet pipe (11) is communicated with the inside of the filtering box (12).

4. The hydrogen recovery device for the purification unit of a purified terephthalic acid plant according to claim 3, wherein: An activated carbon plate (13) is arranged between the inner walls of the filtering box (12).

5. The hydrogen recovery device for the refining unit of a purified terephthalic acid plant according to claim 4, wherein: A top cover (14) is fixedly installed at the top of the filtering box (12), and the outer wall of the second air inlet pipe (11) is fixedly inserted into the inside of the top cover (14).

6. The hydrogen recovery device for the purification unit of a purified terephthalic acid plant according to claim 5, characterized in that: A fan (15) is fixedly installed at the top of the operation panel (1), and the input end of the fan (15) is communicated with the inside of the filtering box (12).

7. The hydrogen recovery device for the purification unit of a purified terephthalic acid plant according to claim 6, characterized in that: A collecting pipe (16) is fixedly installed on one side of the outer wall of the fan (15). A collecting box (17) is fixedly installed at the top of the operation panel (1), and the input end of the collecting pipe (16) is communicated with the inside of the collecting box (17).

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