Hydrogen peroxide production oxidation column

Abstract

The utility model belongs to the technical field of oxidation tower, concretely relates to a hydrogen peroxide preparation is with oxidation tower, including tower body, the upper portion of tower body is provided with hydrogenation liquid inlet and is located the liquid distributor that hydrogenation liquid inlet is connected with in the inside of tower body, the bottom of tower body is provided with oxidizing liquid export, the inside of tower body between hydrogenation liquid inlet and oxidizing liquid export is provided with tray, the liquid distributor includes liquid inlet portion and liquid distribution part, liquid distribution part is symmetrically provided with a plurality of groups at liquid inlet portion both sides and is respectively communicated with liquid inlet portion, the width of liquid inlet portion is gradually decreased from input end to distal end. The utility model discloses the liquid inlet portion of liquid distributor is designed as the structure that the width is gradually decreased from input end to distal end, improves the distribution uniformity of hydrogenation liquid in the tower body, avoids the local failure of catalyst on the tray because of liquid gathering, improves reaction efficiency and catalyst service life.

Description

Technical Field

[0001] This utility model belongs to the field of oxidation tower technology, specifically relating to an oxidation tower for hydrogen peroxide preparation. Background Technology

[0002] Hydrogen peroxide, as an important inorganic chemical product, is widely used in chemical, pharmaceutical and other fields. The oxidation tower is one of the core equipment in its preparation process. During the oxidation reaction, the uniformity of the distribution of the hydrogenated liquid in the tower directly affects the reaction efficiency and product purity. Only when the hydrogenated liquid can be evenly dispersed and cover the tower plates can the reaction interface be fully contacted, ensuring that the catalyst evenly distributed in the tower plates can play its full role. This avoids the catalyst in some areas becoming ineffective due to excessive contact with the hydrogenated liquid, while the catalyst in other areas still retains high activity.

[0003] To achieve uniform distribution of the hydrogenated liquid, a liquid distributor is typically installed at the inlet of the oxidation tower. Its core function is to divert the hydrogenated liquid, allowing it to fall evenly onto the lower trays and ensuring that each area on the trays receives approximately the same amount of liquid. In existing technology, the liquid distributor generally consists of an inlet pipe and distribution pipes connected in parallel on both sides of the inlet pipe. Openings on the distribution pipes guide the liquid to different areas of the tower.

[0004] However, due to pressure loss along the flow path of the hydrogenated liquid in the inlet pipe, the water pressure is higher in the area near the inlet end, resulting in a larger liquid output from the parallel distributor on that side. As the hydrogenated liquid flows further away from the inlet pipe, the water pressure gradually decreases, and the liquid output from the distributor on the side farther from the inlet end decreases accordingly. This uneven flow rate caused by water pressure differences directly leads to excessive liquid accumulation in some areas of the tray, resulting in accelerated catalyst deactivation in some areas and insufficient catalyst participation in the reaction in others. This not only reduces the overall reaction efficiency but also requires frequent replacement of the degraded catalyst, increasing equipment maintenance costs. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides an oxidation tower for hydrogen peroxide preparation. By designing the inlet section of the liquid distributor with a structure in which the width gradually decreases from the input end to the far end, the uniformity of the hydrogenated liquid distribution in the tower body is improved, the catalyst on the tower plate is prevented from local failure due to liquid accumulation, and the reaction efficiency and catalyst lifespan are improved.

[0006] The specific technical solution adopted in this utility model is as follows:

[0007] An oxidation tower for hydrogen peroxide preparation includes a tower body, an inlet for hydrogenated liquid and a liquid distributor located inside the tower body and connected to the inlet for hydrogenated liquid, an outlet for oxidized liquid at the bottom of the tower body, a tray inside the tower body between the inlet for hydrogenated liquid and the outlet for oxidized liquid, and a liquid distributor including an inlet section and a dispensing section. The dispensing section is symmetrically arranged on both sides of the inlet section and is connected to the inlet section respectively. The width of the inlet section gradually decreases from the input end to the distal end.

[0008] The liquid distributor includes a housing, a fixed plate and guide vanes located inside the housing. The side wall of the housing is provided with a through hole that connects to the hydrogenated liquid inlet. The fixed plate is symmetrically arranged on both sides of the hydrogenated liquid inlet in the liquid outlet direction. The channel between two sets of fixed plates forms the liquid inlet of the liquid distributor. Multiple sets of guide vanes are arranged at intervals along the fixed plate. The channel between adjacent guide vanes forms the liquid distribution section of the liquid distributor. Multiple flow holes are arranged at intervals along the liquid distribution section on the bottom plate of the housing.

[0009] The diameter of the diversion orifice gradually increases from the inlet end to the distal end of the liquid distribution section.

[0010] The fixed plate is provided with positioning slots along the vertical direction. Multiple sets of positioning slots are equally spaced along the length of the fixed plate. The guide plate has an L-shaped structure. The corner of the guide plate is arc-shaped and is inserted and matched with the fixed plate by means of the positioning slots. The guide end of the guide plate is located in the liquid inlet. The extension line of the guide end of the guide plate forms an angle of 5-10° with the liquid outlet direction of the hydrogenated liquid inlet.

[0011] The guide plate has a limiting rib at its guide end, which is arranged vertically and the end of the limiting rib is fixedly connected to the shell.

[0012] The liquid distributor also includes reinforcing ribs, which are arranged in a direction parallel to the liquid outlet direction of the hydrogenated liquid inlet. One end of the reinforcing rib is fixedly connected to the inner wall of one side of the housing, and the other end of the reinforcing rib passes through the top edge of multiple sets of guide vanes and is fixedly connected to the inner wall of the other side of the housing.

[0013] The tower body is also equipped with a heat exchanger. Multiple sets of tower plates and heat exchangers are arranged vertically, and the tower plates and heat exchangers are distributed alternately along the vertical direction.

[0014] The beneficial effects of this utility model are:

[0015] 1. In this utility model, the liquid distributor's inlet section is designed with a structure in which the width gradually decreases from the input end to the far end, thereby improving the uniformity of hydrogenation liquid distribution in the tower body, avoiding local failure of the catalyst on the tower plate due to liquid accumulation, and improving reaction efficiency and catalyst lifespan.

[0016] As the width of the inlet gradually decreases along the flow direction of the hydrogenated liquid, the decrease in its cross-sectional area can compensate for the pressure loss along the flow path. The decrease in cross-sectional area will increase the liquid flow rate, thereby maintaining a basically consistent liquid flow rate at each position in the inlet, and ultimately achieving a uniform distribution of liquid flow rate in each area of ​​the tray.

[0017] 2. As the hydrogenated liquid flows in the inlet and outlet sections, it generates a continuous impact force, especially under high flow conditions. This may cause the guide vanes to shake slightly, generate noise, or even deform. The channel width of the guide vanes will widen, disrupting the uniformity of the flow distribution.

[0018] Therefore, this utility model is provided with reinforcing ribs that penetrate multiple sets of guide vanes and connect to both sides of the inner wall of the shell to form a rigid support structure, which fixes the guide vanes and the shell as a whole, improves the structural strength of the guide vanes and resists the bending moment generated by liquid impact, reduces noise generation and prevents the guide vanes from deforming. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the oxidation tower structure;

[0020] Figure 2 This is a schematic cross-sectional view of a liquid distributor.

[0021] Figure 3 for Figure 2 An enlarged schematic diagram of part A in the middle;

[0022] Figure 4 This is a schematic diagram of the flow guide vane structure;

[0023] In the attached diagram, 1 is the tower body, 2 is the hydrogenated liquid inlet, 3 is the liquid distributor, 301 is the liquid inlet, 302 is the liquid distribution section, 4 is the oxidized liquid outlet, 5 is the tower plate, 6 is the shell, 7 is the fixing plate, 8 is the guide vane, 9 is the flow distribution hole, 10 is the positioning slot, 11 is the reinforcing rib, 12 is the heat exchanger, and 13 is the limiting rib. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0025] Specific embodiments, such as Figure 1As shown, this utility model provides an oxidation tower for hydrogen peroxide preparation, including a tower body 1. The upper part of the tower body 1 is provided with a hydrogenated liquid inlet 2 and a liquid distributor 3 located inside the tower body 1 and connected to the hydrogenated liquid inlet 2. The bottom of the tower body 1 is provided with an oxidation liquid outlet 4. A tower plate 5 is provided inside the tower body 1 between the hydrogenated liquid inlet 2 and the oxidation liquid outlet 4. The liquid distributor 3 includes a liquid inlet section 301 and a liquid distribution section 302. Multiple sets of liquid distribution sections 302 are symmetrically arranged on both sides of the liquid inlet section 301 and are respectively connected to the liquid inlet section 301. The width of the liquid inlet section 301 gradually decreases from the input end to the far end.

[0026] In existing technologies, the liquid distributor 3 typically includes an inlet pipe and parallel distribution pipes on both sides of the inlet pipe, using openings in the distribution pipes to guide the liquid to different areas of the tower body 1. However, due to pressure loss along the flow path of the hydrogenated liquid in the inlet pipe, the water pressure is higher in the area near the inlet end, resulting in a larger liquid output from the parallel distribution pipe on that side. As the hydrogenated liquid flows further away from the inlet pipe, the water pressure gradually decreases, and the liquid output from the distribution pipe on the side farther from the inlet end decreases accordingly. This uneven flow rate caused by water pressure differences directly leads to excessive liquid accumulation in some areas of the tower plate 5, causing accelerated catalyst deactivation in some areas and insufficient catalyst participation in the reaction in others. This not only reduces the overall reaction efficiency but also requires frequent replacement of the degraded catalyst, increasing equipment maintenance costs.

[0027] Therefore, in this invention, the liquid inlet 301 of the liquid distributor 3 is designed with a structure in which the width gradually decreases from the input end to the far end, thereby improving the uniformity of the distribution of hydrogenated liquid in the tower body 1, avoiding local failure of the catalyst on the tower plate 5 due to liquid accumulation, and improving the reaction efficiency and catalyst lifespan.

[0028] As the width of the liquid inlet 301 gradually decreases along the flow direction of the hydrogenated liquid, the decrease in its cross-sectional area can compensate for the pressure loss along the flow path. The decrease in cross-sectional area will increase the liquid flow rate, thereby maintaining the liquid outflow at each position in the liquid inlet 301 to be basically consistent, and finally achieving a uniform distribution of liquid flow rate in each area of ​​the tray 5.

[0029] like Figure 2-4 The liquid distributor 3 includes a housing 6, a fixed plate 7 and guide vanes 8 located inside the housing 6. The side wall of the housing 6 is provided with a through hole that connects to the hydrogenated liquid inlet 2. The fixed plate 7 is symmetrically arranged on both sides of the outlet direction of the hydrogenated liquid inlet 2. The channel between two sets of fixed plates 7 forms the liquid inlet 301 of the liquid distributor 3. Multiple sets of guide vanes 8 are arranged at intervals along the fixed plate 7. The channel between adjacent guide vanes 8 forms the liquid distribution section 302 of the liquid distributor 3. Multiple distribution holes 9 are arranged at intervals along the liquid distribution section 302 on the bottom plate of the housing 6.

[0030] The two ends of the fixing plate 7 are fixedly connected to the inner wall of the housing 6. The extension direction of the fixing plate 7 forms an angle of approximately 2-3° with the liquid outlet direction of the hydrogenated liquid inlet 2. The fixing plate 7 is held between the upper cover plate and the lower bottom plate of the housing 6. The fixing plate 7, the upper cover plate and the lower bottom plate of the housing 6, and the inner wall of the housing 6 together form the liquid inlet 301. The end of the liquid inlet 301 away from the hydrogenated liquid inlet 2 is closed. A through hole is provided on the fixing plate 7 at the input end of the liquid distribution section 302, allowing the hydrogenated liquid to enter the liquid distribution section 302.

[0031] One end of the guide vane 8 is fixedly connected to the inner wall of the housing 6, and the other end of the guide vane 8 is fixedly connected to the fixing plate 7. The guide vane 8 is also clamped by the upper cover plate and the lower bottom plate of the housing 6. The two adjacent sets of guide vanes 8, the upper cover plate and the lower bottom plate of the housing 6, and the inner wall of the housing 6 together form the liquid distribution section 302. The end of the liquid distribution section 302 away from the fixing plate 7 is closed.

[0032] In addition, an outlet hole is provided on the housing 6 in the area where the liquid inlet 301 is located.

[0033] The diameter of the diversion orifice 9 gradually increases from the input end to the distal end of the liquid distribution section 302.

[0034] Since the water pressure is higher at the input end near the liquid distribution section 302 and lower at the far end, and the flow rate is proportional to the water pressure and the size of the diversion orifice 9, the size of the diversion orifice 9 can be adjusted so that the diversion orifice 9 is larger where the water pressure is lower, so that the liquid output at all parts of the liquid distribution section 302 is basically the same, further improving the uniformity of the hydrogenated liquid distribution on the tray 5.

[0035] like Figure 2-3 The fixed plate 7 is provided with a vertical positioning slot 10. Multiple sets of positioning slots 10 are provided at equal intervals along the length of the fixed plate 7. The guide plate 8 has an L-shaped structure. The corner of the guide plate 8 is arc-shaped and is inserted and matched with the fixed plate 7 by means of the positioning slot 10. The guide end of the guide plate 8 is located in the liquid inlet 301. The extension line of the guide end of the guide plate 8 forms an angle of 5-10° with the liquid outlet direction of the hydrogenated liquid inlet 2.

[0036] The positioning slots 10 on the fixing plate 7 are evenly distributed along the length direction, which can accurately fix the position of the guide vanes 8 and ensure that the width of the liquid distribution section 302 between adjacent guide vanes 8 is consistent, avoiding uneven flow distribution caused by installation deviation. After the guide vanes 8 are inserted and fitted with the positioning slots 10, the gap between the positioning slots 10 and the guide vanes 8 needs to be sealed with sealant to prevent hydrogenated liquid from seeping into the liquid distribution section 302 along the gap and affecting the uniformity of water pressure. The corners of the L-shaped guide vanes 8 are designed with arcs, which can play a buffering and guiding role, reduce the impact of liquid on the guide vanes 8, and reduce the pressure loss of water flow. The guide end of the guide plate 8 forms an angle of 5-10° with the outlet direction of the hydrogenated liquid. The guide ends of adjacent guide plates 8 form the guide inlets of the liquid distribution section 302. The liquid in the inlet section 301 can be guided to the liquid distribution sections 302 on both sides through the guiding effect. At the same time, the small-angle guidance can reduce the turbulence caused by the sudden change in flow direction, maintain the stability of the water flow in the inlet section 301, and thus ensure that the flow rate of each liquid distribution section 302 is consistent.

[0037] The guide plate 8 has a limiting rib 13 at its guide end. The limiting rib 13 is arranged in a vertical direction and its end is fixedly connected to the housing 6.

[0038] Because the guide end is constantly impacted by water flow, and the guide plate 8 itself is relatively thin, the guide end is prone to shaking. Therefore, a limiting rib 13 is provided at the guide end to reinforce the guide end, thereby reducing the shaking caused by the water flow impact and improving the service life of the guide plate 8.

[0039] like Figure 2-3 The liquid distributor 3 further includes a reinforcing rib 11, the reinforcing rib 11 being arranged in a direction parallel to the liquid outlet direction of the hydrogenated liquid inlet 2, one end of the reinforcing rib 11 being fixedly connected to one side of the inner wall of the housing 6, and the other end of the reinforcing rib 11 passing through the top edge of the multiple sets of guide vanes 8 and being fixedly connected to the other side of the inner wall of the housing 6.

[0040] When the hydrogenated liquid flows within the inlet section 301 and the distribution section 302, it generates continuous impact force. Especially under high flow conditions, this may cause slight shaking of the guide vanes 8, generating noise, or even deformation of the guide vanes 8, widening the channel width of the distribution section 302 and disrupting the uniformity of the flow distribution. Therefore, reinforcing ribs 11 are provided, penetrating multiple sets of guide vanes 8 and connecting to both sides of the inner wall of the housing 6, forming a rigid support structure. This fixes the guide vanes 8 and the housing 6 as a whole, improving the structural strength of the guide vanes 8 and resisting the bending moment generated by the liquid impact, reducing noise generation, and preventing deformation of the guide vanes 8.

[0041] In addition, the reinforcing rib 11 in this invention is arranged along the top of the housing 6 to avoid obstructing the flow of water into the liquid distribution section 302.

[0042] like Figure 1 The tower body 1 is also equipped with a heat exchanger 12. Multiple sets of tower plates 5 and heat exchangers 12 are arranged in the vertical direction, and the tower plates 5 and heat exchangers 12 are alternately distributed in the vertical direction.

[0043] Since the oxidation reaction between the hydrogenated liquid and the oxidant on tray 5 is an exothermic reaction, the accumulation of heat will cause the temperature inside the tower to rise. The temperature rise will significantly affect the catalyst activity, not only reducing the reaction rate, but also potentially triggering side reactions such as hydrogen peroxide decomposition.

[0044] Therefore, the heat exchanger 12 is placed between adjacent trays 5 to form a "tray 5-heat exchanger 12-tray 5" structure. After the hydrogenated liquid undergoes oxidation reaction in the previous tray 5, its temperature will rise. The heat it carries is promptly carried away by the cooling medium flowing through the heat exchanger 12, so that when the hydrogenated liquid enters the next tray 5, its temperature is maintained in the optimal reaction range, avoiding the adverse effects of excessive temperature, thereby improving the overall reaction efficiency and product purity.

Claims

1. An oxidation tower for hydrogen peroxide preparation, comprising a tower body (1), wherein a hydrogenated liquid inlet (2) is provided at the upper part of the tower body (1) and a liquid distributor (3) is located inside the tower body (1) and connected to the hydrogenated liquid inlet (2), an oxidation liquid outlet (4) is provided at the bottom of the tower body (1), and a tray (5) is provided inside the tower body (1) between the hydrogenated liquid inlet (2) and the oxidation liquid outlet (4), characterized in that, The liquid distributor (3) includes an inlet section (301) and a dispensing section (302). The dispensing section (302) is symmetrically arranged on both sides of the inlet section (301) and is connected to the inlet section (301) respectively. The width of the inlet section (301) gradually decreases from the input end to the far end.

2. The oxidation tower for hydrogen peroxide preparation according to claim 1, characterized in that, The liquid distributor (3) includes a housing (6) and a fixed plate (7) and a guide plate (8) located inside the housing (6). The side wall of the housing (6) is provided with a through hole and connected to the hydrogenated liquid inlet (2). The fixed plate (7) is symmetrically arranged on both sides of the outlet direction of the hydrogenated liquid inlet (2). The channel between the two sets of fixed plates (7) forms the liquid inlet (301) of the liquid distributor (3). Multiple sets of guide plates (8) are arranged at intervals along the fixed plate (7). The channel between adjacent guide plates (8) forms the liquid distribution section (302) of the liquid distributor (3). Multiple groups of flow holes (9) are arranged at intervals along the liquid distribution section (302) on the bottom plate of the housing (6).

3. The oxidation tower for hydrogen peroxide preparation according to claim 2, characterized in that, The diameter of the diversion orifice (9) gradually increases from the inlet end to the distal end of the liquid distribution section (302).

4. The oxidation tower for hydrogen peroxide preparation according to claim 2, characterized in that, The fixing plate (7) is provided with a positioning slot (10) along the vertical direction. Multiple sets of positioning slots (10) are provided at equal intervals along the length of the fixing plate (7). The guide plate (8) has an L-shaped structure. The corner of the guide plate (8) is arc-shaped and is inserted and matched with the fixing plate (7) by means of the positioning slot (10). The guide end of the guide plate (8) is located in the liquid inlet (301). The extension line of the guide end of the guide plate (8) forms an angle of 5-10° with the liquid outlet direction of the hydrogenated liquid inlet (2).

5. The oxidation tower for hydrogen peroxide preparation according to claim 4, characterized in that, The guide plate (8) has a limiting rib (13) at its guide end. The limiting rib (13) is arranged in the vertical direction and the end of the limiting rib (13) is fixedly connected to the shell (6).

6. The oxidation tower for hydrogen peroxide preparation according to claim 2, characterized in that, The liquid distributor (3) also includes a reinforcing rib (11), the reinforcing rib (11) is arranged in a direction parallel to the liquid outlet direction of the hydrogenated liquid inlet (2), one end of the reinforcing rib (11) is fixedly connected to the inner wall of one side of the housing (6), and the other end of the reinforcing rib (11) passes through the top edge of multiple sets of guide vanes (8) and is fixedly connected to the inner wall of the other side of the housing (6).

7. The oxidation tower for hydrogen peroxide preparation according to claim 1, characterized in that, The tower body (1) is also equipped with a heat exchanger (12). Multiple sets of tower plates (5) and heat exchangers (12) are arranged in the vertical direction, and the tower plates (5) and heat exchangers (12) are alternately distributed in the vertical direction.

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