Hydrogenation tower gas-liquid-solid three-phase distributor for hydrogen peroxide production

Abstract

The utility model is applicable to the technical field of gas-liquid-solid distributors, and provides a hydrogenation tower gas-liquid-solid three-phase distributor for hydrogen peroxide production, which comprises a device cylinder, and the top end of the device cylinder is vertically communicated with a feed liquid inlet pipe and a hydrogen inlet pipe. According to the hydrogenation tower gas-liquid-solid three-phase distributor for hydrogen peroxide production, through the arrangement of the coarse distributor, the fine distributor and the downcomer, after entering the device, feed liquid is firstly distributed by the coarse distributor and then flows to the fine distributor below, and after coming out of the fine distributor, the feed liquid firstly passes through a catalyst layer with a forced distribution plate, then flows to a bulk catalyst layer and then flows to the next process; when the flow of the feed liquid is too large, the liquid holding layer of the coarse distributor rises and can flow out through the overflow groove of the downcomer, so that the operation flexibility is greatly improved, and meanwhile, the bias flow phenomenon after the feed liquid enters the catalyst layer is avoided through the design of the forced distribution plate, so that the utilization rate of the catalyst and the excessive hydrogenation reaction phenomenon are improved; and long-time safe and stable operation of the device is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas-liquid-solid distributors, in particular to a gas-liquid-solid three-phase distributor for a hydrogenation tower used in hydrogen peroxide production. Background Art

[0002] The anthraquinone process for producing hydrogen peroxide is currently the primary industrial method, and the hydrogenation of the anthraquinone working fluid is the core of the entire anthraquinone process. The hydrogenation column (also known as a fixed bed) in the process is a typical trickle-bed reactor. The anthraquinone hydrogenation reaction is a surface diffusion-controlled reaction, so uniform material distribution is crucial for reaction efficiency. Uneven gas-liquid distribution can lead to over-hydrogenation of reactants in certain areas and insufficient catalyst performance in certain areas, impacting reaction yield or exacerbating side reactions, shortening catalyst life or regeneration cycles. Continuous uneven distribution can lead to localized catalyst agglomeration and blockage in the hydrogenation column, excessive pressure drop, and abnormal shutdowns.

[0003] Currently, most hydrogenation towers in the device use gas-liquid sieve plate distributors, which only distribute the working fluid and hydrogen. Moreover, these distributors are often made of small pieces. It is difficult to ensure that the distributor plate surface is absolutely level during installation. Installation errors will cause the distribution plate surface to tilt at a certain angle in the horizontal direction. Even if it is completely level at the beginning of installation, the distributor plate surface will lose levelness due to thermal expansion and load during operation, which will cause the material to flow unevenly, with some areas having more liquid and some areas having less liquid or no liquid. This will cause local over-hydrogenation in the low-liquid areas of the catalyst bed, while insufficient hydrogenation reaction will occur in the high-liquid areas. In other words, in those low-liquid areas where local over-hydrogenation occurs, anthraquinone precipitates, the catalyst nucleates, grows continuously, agglomerates, and the bed resistance pressure increases. Due to the short residence time of the material in the high-liquid areas, it does not fully contact the catalyst. Therefore, a high-performance distributor should spray the gas-liquid mixture evenly onto the catalyst bed surface, fully exert the catalytic effect of the entire bed, reduce the generation of side reactions, and ensure the stability of hydrogenation efficiency and the quality of the working fluid. Utility Model Content

[0004] The utility model provides a gas-liquid-solid three-phase distributor for a hydrogenation tower used in hydrogen peroxide production, aiming to solve the problem that the current distributor cannot evenly spray gas and liquid materials onto the surface of a catalyst bed.

[0005] The utility model is realized as follows: a gas-liquid-solid three-phase distributor for a hydrogenation tower for hydrogen peroxide production, comprising a device barrel, the top of which is vertically connected to a liquid inlet pipe and a hydrogen inlet pipe, a coarse distributor being laterally fixedly connected to the upper portion of the inner cavity of the device barrel, a fine distributor being laterally fixedly connected to the upper portion of the inner cavity of the device barrel and located below the coarse distributor, a plurality of mounting openings being vertically penetrated through the upper surface of the coarse distributor, and a downcomer being vertically fixedly connected to the interior of each of the plurality of mounting openings, the bottom end of which penetrates the fine distributor and extends downward;

[0006] A fixing ring is fixedly connected transversely to the middle of the inner cavity of the device tube, a forced distribution plate is fixedly connected inside the fixing ring, and a catalyst layer is arranged inside the device tube and below the forced distribution plate.

[0007] Preferably, a U-shaped overflow groove is provided at the top of each of the plurality of downcomers, and a plurality of drainage holes are provided transversely through the outer surfaces of each of the plurality of downcomers at the positions of the fine distributors.

[0008] Preferably, baffles are fixedly connected to the top of the inner cavity of the device barrel and located below the liquid inlet pipe and the hydrogen inlet pipe.

[0009] Preferably, a mounting hole is provided on the outer surface of the device cylinder and is located on the upper part of the coarse distributor and is passed through transversely, and a sight glass is fixedly connected to the interior of the mounting hole.

[0010] Preferably, a discharge pipe is laterally connected to the outer surface of the device cylinder and located at the catalyst layer.

[0011] Preferably, a plurality of supporting legs are vertically fixedly connected to the bottom of the outer side surface of the device tube, and a reinforcement rod is transversely fixedly connected between every two adjacent supporting legs.

[0012] Beneficial effects

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: the gas-liquid-solid three-phase distributor of the hydrogenation tower for hydrogen peroxide production of the present invention is provided with a coarse distributor, a fine distributor and a downcomer. When the feed liquid enters the interior of the device, it is first distributed by the coarse distributor and then flows to the fine distributor below. After coming out of the fine distributor, it first passes through the catalyst layer with a forced distribution plate, then to the bulk catalyst layer, and then to the next process. When the feed liquid flow rate is too large, the liquid holding layer of the coarse distributor rises and can flow out through the overflow groove of the downcomer. When the liquid holding layer of the fine distributor rises, it can also be discharged from the drainage hole on the outer surface of the downcomer, which greatly improves the operational flexibility. At the same time, the design of the forced distribution plate avoids the phenomenon of biased flow after the feed liquid enters the catalyst layer, thereby improving the utilization rate of the catalyst and the phenomenon of excessive hydrogenation reaction, which is conducive to the long-term safe and stable operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the external structure of the utility model;

[0016] Figure 3 It is a structural schematic diagram of the downcomer in the utility model.

[0017] In the figure: 1-device cylinder, 2-liquid inlet pipe, 3-hydrogen inlet pipe, 4-baffle, 5-coarse distributor, 6-fine distributor, 7-downpipe, 8-overflow trough, 9-drain hole, 10-sight glass, 11-fixing ring, 12-forced distribution plate, 13-catalyst layer, 14-discharge pipe, 15-support leg, 16-reinforcement rod. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] See also Figure 1-3 The utility model provides a technical solution: a gas-liquid-solid three-phase distributor for a hydrogenation tower for hydrogen peroxide production, comprising a device barrel 1, the top of which is vertically connected to a liquid inlet pipe 2 and a hydrogen inlet pipe 3, a coarse distributor 5 being laterally fixedly connected to the upper part of the inner cavity of the device barrel 1, a fine distributor 6 being laterally fixedly connected to the upper part of the inner cavity of the device barrel 1 and located below the coarse distributor 5, a plurality of mounting openings being vertically penetrated through the upper surface of the coarse distributor 5, and a downcomer 7 being vertically fixedly connected to the interior of each of the plurality of mounting openings, the bottom end of which penetrates the fine distributor 6 and extends downward;

[0020] A fixing ring 11 is fixedly connected transversely to the middle of the inner cavity of the device tube 1 , a forced distribution plate 12 is fixedly connected inside the fixing ring 11 , and a catalyst layer 13 is provided inside the device tube 1 and below the forced distribution plate 12 .

[0021] A U-shaped overflow groove 8 is provided at the top of each of the plurality of downcomers 7 , and a plurality of drainage holes 9 are provided transversely through the outer surfaces of each of the plurality of downcomers 7 and at the positions of the fine distributor 6 .

[0022] In this embodiment, when the device is in use, the feed liquid is first poured into the interior of the device through the feed liquid inlet pipe 2, and hydrogen enters the interior of the device through the hydrogen inlet pipe 3. When the feed liquid enters the interior of the device, it is first distributed by the coarse distributor 5, and then flows to the fine distributor 6 below. After coming out of the fine distributor 6, it first passes through the forced distribution plate 12, then to the catalyst layer 13, and then to the next process. When the feed liquid flow rate is too large, the liquid holding layer of the coarse distributor 5 rises and can flow out through the overflow groove 8 of the downcomer 7. When the liquid holding layer of the fine distributor 6 rises, it can also be discharged from the drainage hole 9 on the outer surface of the downcomer 7, which greatly improves the operational flexibility. At the same time, the design of the forced distribution plate 12 avoids the deviation phenomenon after the feed liquid enters the catalyst layer, thereby improving the utilization rate of the catalyst and the excessive hydrogenation reaction phenomenon, which is conducive to the long-term safe and stable operation of the device.

[0023] Furthermore, a baffle 4 is fixedly connected to the top of the inner cavity of the device cylinder 1 and located below the liquid inlet pipe 2 and the hydrogen inlet pipe 3.

[0024] In this embodiment, the baffle 4 can make the liquid feed and hydrogen diffuse horizontally immediately after entering the interior of the device, thereby improving the distribution effect.

[0025] Furthermore, a mounting hole is provided on the outer surface of the device cylinder 1 and is located above the coarse distributor 5 and is transversely penetrated, and a sight glass 10 is fixedly connected to the interior of the mounting hole.

[0026] In this embodiment, the sight glass 10 allows the staff to observe the height of the liquid layer in the coarse distributor, determine whether there is overflow of the liquid from the downcomer 7, and adjust the total flow into the equipment in time.

[0027] Furthermore, a discharge pipe 14 is laterally connected to the outer surface of the device cylinder 1 and located at the catalyst layer 13 .

[0028] A plurality of support legs 15 are vertically fixedly connected to the bottom of the outer surface of the device tube 1 , and a reinforcement rod 16 is transversely fixedly connected between every two adjacent support legs 15 .

[0029] In this embodiment, the discharge pipe 14 is used to discharge materials, the support legs 15 support the entire device, and the multiple reinforcement rods 16 improve the stability of the support legs.

[0030] The working principle and use process of the present invention: After the present invention is installed, when the device is used, the feed liquid is first poured into the interior of the device through the feed liquid inlet pipe 2, and hydrogen enters the interior of the device through the hydrogen inlet pipe 3. When the feed liquid enters the interior of the device, it is first distributed by the coarse distributor 5, and then flows to the fine distributor 6 below. After coming out of the fine distributor 6, it first passes through the forced distribution plate 12, then to the catalyst layer 13, and then to the next process. When the feed liquid flow rate is too large, the liquid holding layer of the coarse distributor 5 rises and can flow out through the overflow groove 8 of the downcomer 7. When the liquid holding layer of the fine distributor 6 rises, it can also be discharged from the drainage hole 9 on the outer surface of the downcomer 7, which greatly improves the operational flexibility. At the same time, the design of the forced distribution plate 12 avoids the phenomenon of biased flow after the feed liquid enters the catalyst layer, thereby improving the utilization rate of the catalyst and the phenomenon of excessive hydrogenation reaction, which is conducive to the long-term safe and stable operation of the device.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gas-liquid-solid three-phase distributor for a hydrogenation tower for hydrogen peroxide production, characterized in that: The invention comprises a device barrel (1), the top of the device barrel (1) is vertically connected to a liquid inlet pipe (2) and a hydrogen inlet pipe (3), the upper part of the inner cavity of the device barrel (1) is transversely fixedly connected to a coarse distributor (5), the upper part of the inner cavity of the device barrel (1) and located below the coarse distributor (5) is transversely fixedly connected to a fine distributor (6), the upper surface of the coarse distributor (5) is vertically penetrated with a plurality of mounting openings, and the interiors of the plurality of mounting openings are vertically fixedly connected to a downcomer (7) whose bottom ends penetrate the fine distributor (6) and extend downwards; A fixing ring (11) is laterally fixedly connected to the middle of the inner cavity of the device cylinder (1), a forced distribution plate (12) is fixedly connected inside the fixing ring (11), and a catalyst layer (13) is provided inside the device cylinder (1) and below the forced distribution plate (12).

2. A hydrogenation tower gas-liquid-solid three-phase distributor for hydrogen peroxide production according to claim 1, characterized in that: The top ends of the plurality of downcomers (7) are each provided with a U-shaped overflow groove (8), and the outer surfaces of the plurality of downcomers (7) and the positions of the fine distributors (6) are each provided with a plurality of drainage holes (9) extending transversely therethrough.

3. A hydrogenation tower gas-liquid-solid three-phase distributor for hydrogen peroxide production according to claim 1, characterized in that: A baffle (4) is fixedly connected to the top end of the inner cavity of the device cylinder (1) and located below the liquid inlet pipe (2) and the hydrogen inlet pipe (3).

4. A gas-liquid-solid three-phase distributor for hydrogenation tower production of hydrogen peroxide according to claim 1, characterized in that: A mounting hole is provided on the outer surface of the device cylinder (1) and located above the coarse distributor (5), and a sight glass (10) is fixedly connected to the interior of the mounting hole.

5. A gas-liquid-solid three-phase distributor for hydrogenation tower production of hydrogen peroxide according to claim 1, characterized in that: A discharge pipe (14) is laterally connected to the outer surface of the device cylinder (1) and located at the position of the catalyst layer (13).

6. A hydrogenation tower gas-liquid-solid three-phase distributor for hydrogen peroxide production as claimed in claim 1, Its characteristics are: The bottom of the outer surface of the device cylinder (1) is vertically fixedly connected with a plurality of supporting legs (15). A reinforcement rod (16) is transversely fixedly connected between each two adjacent support legs (15).

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