Hydrogen chloride gas absorption device for phosphorous acid production

Abstract

The utility model provides a hydrogen chloride gas absorption device for phosphorous acid production, which comprises an absorption tank, the absorption tank is vertically arranged, the inner upper end of the absorption tank is fixedly connected with a liquid distribution disc, the absorption tank is also fixedly connected with a liquid inlet pipe, one end of the liquid inlet pipe extends into the absorption tank and is provided with a downward liquid outlet positioned above the liquid distribution disc, and the other end of the liquid inlet pipe extends into the absorption tank. A plurality of liquid distribution holes are formed in the liquid distribution disc in a penetrating manner; an air inlet pipe is further fixedly connected to the absorption tank, a plurality of mounting ring pipes which are located below the liquid distribution disc and are concentrically arranged are further fixedly arranged in the absorption tank, the mounting ring pipes are fixedly communicated through a plurality of connecting pipes, the air inlet pipe is further communicated with the mounting ring pipe located on the outermost side, and a plurality of spray heads are further installed on the mounting ring pipes. The absorption efficiency of the hydrogen chloride gas can be improved, and most of the hydrogen chloride gas in the tail gas can be absorbed through one-time absorption treatment.

Description

Technical Field

[0001] This utility model relates to the field of gas absorption equipment technology, and in particular to a hydrogen chloride gas absorption device for phosphorous acid production. Background Technology

[0002] In existing technologies, phosphoric acid can be produced using phosphorus trichloride. This process generates tail gas containing hydrogen chloride gas. This tail gas typically requires absorption treatment with water to remove the hydrogen chloride gas before further purification and discharge. This process prevents the hydrogen chloride gas from corroding subsequent purification equipment and allows for the recovery of hydrochloric acid produced by dissolving the hydrogen chloride gas in water. Existing technologies generally employ absorption devices for this treatment. Specifically, for example… Figure 1 As shown, the absorption device generally includes an absorption tank 1 and an inlet pipe 7, a liquid inlet pipe 3, a tail gas pipe 10, and a drain pipe 11 fixed thereon. During operation, the tail gas containing hydrogen chloride gas is introduced through the inlet pipe 7, and the water for absorption is introduced through the liquid inlet pipe 3. The two meet in the absorption tank 1 and complete absorption, turning into a hydrochloric acid solution. The hydrochloric acid solution is discharged through the drain pipe 11, while the remaining tail gas is discharged through the tail gas pipe 10. However, in actual operation, the water and the tail gas containing hydrogen chloride gas may not have sufficient contact in the absorption tank 1. Therefore, the treated tail gas may still contain a large amount of hydrogen chloride gas, requiring multiple absorption treatments, which reduces efficiency and makes the overall treatment equipment more complex. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a hydrogen chloride gas absorption device for phosphorous acid production, which solves the problem that insufficient contact between water and hydrogen chloride-containing tail gas in the absorption tank may lead to the need for multiple absorption treatments.

[0004] According to an embodiment of this utility model, a hydrogen chloride gas absorption device for phosphorous acid production includes an absorption tank, which is vertically arranged and has a liquid distribution plate fixedly connected to its upper end. The absorption tank is also fixedly connected to an inlet pipe, one end of which extends into the absorption tank and has a downward-facing outlet located above the liquid distribution plate. The liquid distribution plate has several liquid distribution holes. An air inlet pipe is also fixedly connected to the absorption tank. Multiple mounting ring pipes are fixedly arranged concentrically below the liquid distribution plate inside the absorption tank and are fixedly connected to each other through multiple connecting pipes. The air inlet pipe is also connected to the outermost mounting ring pipe, and several nozzles are installed on the mounting ring pipe. The top and bottom ends of the absorption tank are respectively fixedly connected to a tail gas pipe and a drain pipe. Water is introduced into the absorption tank through the inlet pipe and flows onto the distribution plate. After passing through multiple distribution holes, it flows downward, forming a water curtain. Meanwhile, the exhaust gas containing hydrogen chloride gas is introduced into multiple installation ring pipes through the inlet pipe, and then discharged through multiple nozzles. The exhaust gas discharged into the absorption tank flows upward and fully convections with the downward-flowing water, resulting in more thorough contact. This improves the absorption efficiency of hydrogen chloride gas. Most of the hydrogen chloride gas in the exhaust gas can be absorbed in a single absorption treatment. Therefore, this solves the problem in the prior art where insufficient contact between water and hydrogen chloride-containing exhaust gas in the absorption tank may require multiple absorption treatments.

[0005] Furthermore, the liquid distribution plate has an upward convexity in the middle and a protrusion fixedly installed at the top. The protrusion extends into the liquid outlet and its outer periphery is separate from the inner wall of the liquid outlet.

[0006] Furthermore, a fixing ring is fixedly connected to the lower outer edge of the liquid distribution plate, and the fixing ring is also fixedly connected to the inner wall of the absorption tank. A recessed annular groove is provided between the fixing ring and the liquid distribution plate, and several leakage holes are provided through the inner bottom surface of the annular groove.

[0007] Furthermore, multiple connecting rods are fixedly connected between the outermost mounting ring pipe and the inner wall of the absorption tank.

[0008] Furthermore, all the mounting rings are on the same plane.

[0009] Furthermore, all mounting rings are arranged in a conical shape from the inside out, with the innermost mounting ring at the highest position.

[0010] Furthermore, at least one partition plate is fixedly installed between the installation ring pipe and the liquid distribution plate, and several through holes are provided through the partition plate.

[0011] Furthermore, the liquid distribution plate is provided with several grooves that are equidistantly recessed and extend from the top to the lower edge, and liquid distribution holes are provided in the grooves and the convex portions between the grooves.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The absorption tank is equipped with a liquid distribution plate and multiple mounting ring pipes. Water is introduced into the absorption tank through the inlet pipe and flows onto the liquid distribution plate. Then, it flows downward through multiple distribution holes, forming a water curtain. The exhaust gas containing hydrogen chloride gas is introduced into the multiple mounting ring pipes through the inlet pipe and then discharged through multiple nozzles. The exhaust gas discharged into the absorption tank flows upward and fully convections with the downward-flowing water, resulting in more thorough contact. Therefore, the absorption efficiency of hydrogen chloride gas can be improved. Most of the hydrogen chloride gas in the exhaust gas can be absorbed in one absorption treatment. This solves the problem in the prior art where insufficient contact between water and exhaust gas containing hydrogen chloride gas in the absorption tank may require multiple absorption treatments. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the absorption tank structure in the prior art;

[0015] Figure 2 This is a schematic diagram of the overall structure of an embodiment of the present utility model. Figure 1 ;

[0016] Figure 3 This is a schematic diagram of the overall structure of an embodiment of the present utility model. Figure 2 ;

[0017] Figure 4 This is a top view of the mounting ring structure according to an embodiment of the present invention;

[0018] Figure 5 for Figure 2 Enlarged schematic diagram of a local structure at point A;

[0019] Figure 6 for Figure 2 Enlarged schematic diagram of the local structure at point B;

[0020] Figure 7 This is a top view of the perforated plate structure according to an embodiment of the present invention;

[0021] In the above attached figures:

[0022] Absorption tank 1, liquid distribution plate 2, liquid inlet pipe 3, liquid outlet 4, liquid distribution hole 5, protrusion 6, air inlet pipe 7, mounting ring pipe 8, nozzle 9, exhaust pipe 10, drain pipe 11, groove 12, fixing ring 13, ring groove 14, leakage hole 15, partition plate 16, perforation 17, connecting rod 18, connecting pipe 19. Detailed Implementation

[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] In an exemplary implementation, such as Figure 2-6As shown, this embodiment provides a hydrogen chloride gas absorption device for phosphorous acid production, which includes an absorption tank 1. The absorption tank 1 is vertically arranged and a liquid distribution plate 2 is fixedly connected to its upper end. The absorption tank 1 is also fixedly connected to an inlet pipe 3, one end of which extends into the absorption tank 1 and has a downward-facing outlet 4 located above the liquid distribution plate 2. The liquid distribution plate 2 has several liquid distribution holes 5. The liquid distribution plate 2 can be convex upward, and a protrusion 6 extending upward into the outlet 4 is fixedly provided on its top. The outer periphery of the protrusion 6 is separated from the inner wall of the outlet 4. The inlet pipe 3 is used to introduce water for absorbing hydrogen chloride gas. After being introduced through the inlet pipe 3, the water flows downward from the outlet 4 in a ring shape between the protrusion 6 and the outlet 4, and then flows to the liquid distribution plate. The liquid flows down the cone surface of the liquid distribution plate 2, passing through the distribution holes 5, thus forming a water curtain in the absorption tank 1 below the liquid distribution plate 2. An air inlet pipe 7 is fixedly connected to the absorption tank 1. Multiple mounting ring pipes 8, located below the liquid distribution plate 2 and concentrically arranged, are also fixedly installed inside the absorption tank 1. These mounting ring pipes 8 are connected by multiple connecting pipes 19. The air inlet pipe 7 is also connected to the outermost mounting ring pipe 8. Several nozzles 9 are installed on the mounting ring pipes 8. The air inlet pipe 7 is used to introduce the tail gas containing hydrogen chloride to be treated. After passing through the air inlet pipe 7, the tail gas enters each mounting ring pipe 8, and then is introduced into the absorption tank 1 from the nozzles 9. The nozzle 9 outlets can be upward-facing. The exhaust gas is positioned so that it moves upward and convects with the water curtain, allowing the water to more fully absorb hydrogen chloride gas to produce hydrochloric acid. The top and bottom of the absorption tank 1 are fixedly connected to an exhaust gas pipe 10 and a drain pipe 11, respectively. The exhaust gas moves upward and eventually passes through the liquid distribution hole 5 and is discharged through the exhaust gas pipe 10, while the produced hydrochloric acid is at the bottom of the absorption tank 1 and is finally discharged through the drain pipe 11. Throughout the process, the hydrogen chloride gas in the exhaust gas can come into more complete contact with the water, resulting in more thorough absorption. Most of the hydrogen chloride gas in the exhaust gas can be absorbed in a single absorption treatment, thus solving the problem in existing technologies where insufficient contact between water and hydrogen chloride-containing exhaust gas in the absorption tank 1 may require multiple treatments. The problem of secondary absorption treatment; in particular, the water in the liquid distribution plate 2 does not completely cover the conical surface of the liquid distribution plate 2 during the outward flow of water, but there will be an uncovered part. The uncovered part is also provided with liquid distribution holes 5. Therefore, the upward exhaust gas can pass through these liquid distribution holes 5 downward, ensuring that both exhaust gas and water can pass through the liquid distribution plate 2 normally; more specifically, several grooves 12 extending from the top edge to the bottom edge can be equidistantly recessed on the liquid distribution plate 2. Liquid distribution holes 5 are provided in the grooves 12 and the convex parts between the grooves 12. The liquid distribution holes 5 located between the grooves 12 allow more exhaust gas to pass through, while the liquid distribution holes 5 located in the grooves 12 allow water to pass through because water enters the grooves 12 more smoothly.

[0026] In further proposals, such as Figure 2-6As shown, a fixing ring 13 is fixedly connected to the lower outer edge of the liquid distribution plate 2, and the fixing ring 13 is also fixedly connected to the inner wall of the absorption tank 1. A recessed annular groove 14 is provided between the fixing ring 13 and the liquid distribution plate 2. Several leakage holes 15 are provided through the inner bottom surface of the annular groove 14. The fixing ring 13 provides an installation base for the liquid distribution plate 2. At the same time, water can enter the annular groove 14 between the fixing ring 13 and the liquid distribution plate 2 and then pass downward through the leakage holes 15.

[0027] like Figure 2 , 3 As shown in Figure 7, the mounting ring pipes 8 can be arranged in several ways. One is that all mounting ring pipes 8 are on the same plane, and another is that all mounting ring pipes 8 are arranged in a conical shape from the inside to the outside, with the innermost mounting ring pipe 8 at the highest position. In the first case, all nozzles 9 are on the same surface, while in the second case, the nozzle 9 in the middle is at a higher position. More specifically, multiple connecting rods 18 are fixedly connected between the outermost mounting ring pipe 8 and the inner wall of the absorption tank 1. The connecting rods 18 and the air inlet pipe 7 together stabilize the mounting ring pipe 8 in the absorption tank 1. Furthermore, at least one partition plate 16 is fixedly installed between the mounting ring pipe 8 and the liquid distribution plate 2. Several through holes 17 are provided through the partition plate 16. The partition plate 16 is set above the nozzles 9. The exhaust gas needs to pass through the leakage hole 15 upwards, and the water also needs to pass through the leakage hole 15 downwards. In this way, the water and exhaust gas can have more sufficient contact near the partition plate 16, so the water can more fully absorb the hydrogen chloride gas in the exhaust gas.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A hydrogen chloride gas absorption device for phosphorous acid production, characterized by, The utility model provides absorbent jar, the vertical setting and its inside upper end fixedly connected with cloth liquid distribution tray, absorbent jar still fixedly connected with liquid inlet pipe and one end of liquid inlet pipe extends to absorbent jar and is provided with the liquid outlet that is located cloth liquid distribution tray top and downward, the cloth liquid distribution tray is provided with a plurality of cloth liquid distribution holes, the absorbent jar still fixedly connected with the air inlet pipe, the absorbent jar still fixedly provided with a plurality of installation ring pipe that is located cloth liquid distribution tray below and same circle center setting, and the installation ring pipe between through a plurality of connecting pipes fixed communication, the air inlet pipe still with the installation ring pipe of most outside side communication, the installation ring pipe still installs a plurality of shower nozzles on, the top end and bottom end of absorbent jar are fixedly connected with the tail gas pipe and drainage pipe that communicate with each other respectively.

2. The hydrogen chloride gas absorbing apparatus for phosphorous acid production according to claim 1, characterized by, The cloth liquid distribution tray is upwardly convex in the middle and has a convex head fixedly arranged at the top end, the convex head extends into the liquid outlet and the outer periphery is separated from the inner wall of the liquid outlet.

3. The hydrogen chloride gas absorbing apparatus for phosphorous acid production according to claim 2, wherein The outer edge of the lower end of the cloth liquid distribution tray is further fixedly connected with a fixed ring, and the fixed ring is further fixedly connected with the inner wall of the absorbent jar, a concave annular groove is further arranged between the fixed ring and the cloth liquid distribution tray, a plurality of leakage holes are further arranged through the inner bottom surface of the annular groove.

4. The hydrogen chloride gas absorbing apparatus for phosphorous acid production according to claim 1, wherein A plurality of connecting rods are further fixedly connected between the installation ring pipe located at the most outer side and the inner wall of the absorbent jar.

5. The hydrogen chloride gas absorbing apparatus for phosphorous acid production according to claim 1, wherein All the installation ring pipes are located on the same plane.

6. The hydrogen chloride gas absorbing apparatus for phosphorous acid production according to claim 1, wherein All the installation ring pipes are arranged in a conical shape from the inner to the outer, and the installation ring pipe located at the innermost side is located at the highest position.

7. The hydrogen chloride gas absorbing apparatus for phosphorous acid production according to claim 1, wherein A plurality of grooves extending from the top end to the lower edge are recessed at equal intervals on the cloth liquid distribution tray, and the upper convex portions in the grooves and between the grooves are provided with the cloth liquid distribution holes.

8. The hydrogen chloride gas absorbing apparatus for phosphorous acid production according to any one of claims 1 to 7, characterized in that, At least one separation hole plate is further fixedly arranged between the installation ring pipe and the cloth liquid distribution tray, a plurality of perforations are further arranged through the separation hole plate.

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