Acid mist absorption device for sulfuric acid production

Abstract

The utility model discloses an acid mist absorption device for sulfuric acid production, relates to the technical field of acid mist absorption treatment, and provides the following scheme aiming at the problems that an absorption method in the prior art easily causes insufficient contact between alkali liquor and acid mist, the acid mist is not completely absorbed, and residual acid mist in exhausted gas is exhausted together, the acid mist absorption device comprises a reaction cylinder, a top cover is connected to the top of the reaction cylinder, a fixed pipe is fixedly welded to the top of the top cover in a penetrating mode, a spiral guide plate is fixedly welded to the outer wall of the fixed pipe, the outer diameter of the spiral guide plate is matched with the inner diameter of the reaction cylinder, and a liquid supplementing pipe is fixedly inserted into one side of the top of the top cover; and a connecting pipe is fixedly inserted into the other side of the top of the top cover. According to the utility model, after acid mist gas is conveyed into the fixed pipe and discharged from the bottom, the discharged gas flows upwards along a spiral channel formed in the reaction cylinder by the spiral guide plate, so that the gas can have more time to react with a solution in the reaction cylinder.

Description

Technical Field

[0001] This utility model relates to the field of acid mist absorption and treatment technology, and in particular to an acid mist absorption device for sulfuric acid production. Background Technology

[0002] High-concentration sulfuric acid has strong hygroscopic properties and can be used as a dehydrating agent. It is also widely used in industry for carbonizing carbohydrate-containing materials such as wood, paper, cotton and linen fabrics, and biological skin and flesh. The production of concentrated sulfuric acid requires first roasting phosphate rock to produce sulfur dioxide, then oxidizing the sulfur dioxide to obtain sulfur trioxide, and finally absorbing it with water and then distilling it to concentrate it, or absorbing it with 98.3% sulfuric acid and then diluting it with water to produce concentrated sulfuric acid. During the production process, acid fumes are generated. These acid fumes can diffuse into the air, causing harm to the human body and corroding buildings and production equipment.

[0003] In the existing technology, the acid mist generated during the production of aluminum sulfate is collected by a fan and discharged into an alkaline solution for absorption. During absorption, the acid mist is directly passed into the alkaline solution for absorption. This absorption method is prone to insufficient contact between the alkaline solution and the acid mist, resulting in incomplete absorption of the acid mist. As a result, residual acid mist will be discharged with the gas. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides an acid mist absorption device for sulfuric acid production, which overcomes the shortcomings of the prior art and effectively solves the problem that the absorption method in the prior art is prone to insufficient contact between the alkali solution and the acid mist, resulting in incomplete absorption of the acid mist and residual acid mist being discharged with the gas.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A sulfuric acid production acid mist absorption device includes a reaction cylinder. A top cover is connected to the top of the reaction cylinder, and a fixing pipe is welded through and fixed to the top of the top cover. A spiral guide plate is welded to the outer wall of the fixing pipe, and the outer diameter of the spiral guide plate is adapted to the inner diameter of the reaction cylinder. A liquid replenishment pipe is inserted and fixed to one side of the top of the top cover, and a connecting pipe is inserted and fixed to the other side of the top of the top cover. A test chamber is provided on one side of the reaction cylinder, and an air inlet pipe connected to the connecting pipe is inserted and fixed to one end of the top of the test chamber. An exhaust pipe is inserted and fixed to the other end of the top of the test chamber, and an absorption cylinder is inserted at the top of the exhaust pipe. A ventilation pipe is inserted and fixed to the top of the outer wall of the absorption cylinder, and a cylinder cover is inserted at one end of the absorption cylinder.

[0007] Acid mist gas is transported to a fixed pipe via an external fan and pipeline and discharged from the bottom. The discharged gas flows upward along a spiral channel formed by a spiral guide plate inside the reaction chamber, allowing the gas more time to react with the solution inside the reaction chamber. The reacted gas enters the test chamber through a connecting pipe and an inlet pipe. After contacting the litmus solution in the test chamber, the color change of the litmus solution determines whether acid mist remains in the gas. If the litmus solution gradually turns red, the sodium hydroxide solution in the reaction chamber is replaced. The gas then enters the absorption chamber through the exhaust pipe, where calcium hydroxide particles absorb the residual mild acid mist.

[0008] Preferably, a drain pipe is welded through and fixed to the bottom of the reaction cylinder, and a control valve is installed on the drain pipe. Sodium hydroxide solution is injected into the reaction cylinder.

[0009] By opening the control valve on the drain pipe, the absorbed and neutralized solution and water can be discharged.

[0010] Preferably, a fixing ring is welded and fixed to the outer wall of the reaction cylinder, and support legs distributed at equal intervals are welded and fixed to the bottom of the fixing ring along the annular shape. A tray is welded and fixed to one side of the annular outer wall of the fixing ring.

[0011] The reaction cylinder is supported and raised using support legs and fixing rings.

[0012] Preferably, the top of the tray has a placement slot, and the placement slot is adapted to the bottom specifications of the test box.

[0013] The placement slots allow the test chamber to be placed more stably on top of the tray.

[0014] Preferably, an observation window is provided on one side of the outer wall of the test chamber, and litmus solution is injected into the test chamber.

[0015] The observation window allows staff to easily observe the color of the litmus solution inside the test chamber, thus determining whether the emitted gas still contains acid.

[0016] Preferably, a bracket is welded and fixed to the other end of the top of the test chamber, and the arc-shaped inner wall of the bracket is adapted to the bottom of the outer wall of the absorption cylinder, and the absorption cylinder is filled with calcium hydroxide particles.

[0017] The calcium hydroxide particles can absorb the mild acid mist in the exhaust gas.

[0018] The beneficial effects of this utility model are as follows:

[0019] After the acid mist gas is delivered to the fixed pipe and discharged from the bottom, the discharged gas flows upward along the spiral channel formed by the spiral guide plate in the reaction cylinder, allowing the gas more time to react with the solution in the reaction cylinder. The reacted gas enters the test chamber through the connecting pipe and the inlet pipe. After contacting the litmus solution in the test chamber, the color change of the litmus solution determines whether acid mist remains in the gas. The gas then enters the absorption cylinder through the exhaust pipe, where the calcium hydroxide particles in the absorption cylinder absorb the residual mild acid mist. This effectively solves the problem in the existing technology where the absorption method easily leads to insufficient contact between the alkali solution and the acid mist, incomplete absorption of acid mist, and residual acid mist being discharged with the gas. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an acid mist absorption device for sulfuric acid production proposed in this utility model;

[0021] Figure 2 This is a schematic diagram of the reaction cylinder connection structure of an acid mist absorption device for sulfuric acid production proposed in this utility model;

[0022] Figure 3 This is a schematic diagram of the top cover connection structure of an acid mist absorption device for sulfuric acid production proposed in this utility model;

[0023] Figure 4 This is a schematic diagram of the test chamber structure of an acid mist absorption device for sulfuric acid production proposed in this utility model.

[0024] In the diagram: 1. Reaction cylinder; 2. Drain pipe; 3. Fixing ring; 4. Support leg; 5. Tray; 6. Top cover; 7. Fixing pipe; 8. Spiral guide plate; 9. Connecting pipe; 10. Liquid replenishment pipe; 11. Test chamber; 12. Air inlet pipe; 13. Exhaust pipe; 14. Absorption cylinder; 15. Ventilation pipe; 16. Cylinder cover; 17. Bracket. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Example:

[0027] Reference Figure 1-4A sulfuric acid production acid mist absorption device includes a reaction cylinder 1, a top cover 6 connected to the top of the reaction cylinder 1, a fixed pipe 7 welded through the top of the top cover 6, a spiral guide plate 8 welded to the outer wall of the fixed pipe 7, the outer diameter of the spiral guide plate 8 being adapted to the inner diameter of the reaction cylinder 1, a replenishment pipe 10 inserted and fixed to one side of the top of the top cover 6, a connecting pipe 9 inserted and fixed to the other side of the top of the top cover 6, a test chamber 11 provided on one side of the reaction cylinder 1, an air inlet pipe 12 connected and communicating with the connecting pipe 9 inserted and fixed to one end of the top of the test chamber 11, an exhaust pipe 13 inserted and fixed to the other end of the top of the test chamber 11, an absorption cylinder 14 inserted to the top of the exhaust pipe 13, a ventilation pipe 15 inserted and fixed to the top of the outer wall of the absorption cylinder 14, and a cylinder cover 16 inserted to one end of the absorption cylinder 14.

[0028] A drain pipe 2 is welded through and fixed to the bottom of the reaction cylinder 1. A control valve is installed on the drain pipe 2. Sodium hydroxide solution is injected into the reaction cylinder 1. By opening the control valve of the drain pipe 2, the absorbed and neutralized solution and water can be discharged. A fixing ring 3 is welded to the outer wall of the reaction cylinder 1. Support legs 4 are evenly distributed along the bottom of the fixing ring 3. A tray 5 is welded to one side of the outer wall of the fixing ring 3. The reaction cylinder 1 is supported and raised by the support legs 4 and the fixing ring 3. A placement groove is opened on the top of the tray 5. The placement groove is adapted to the bottom specifications of the test box 11. The placement groove allows the test box 11 to be placed more stably on the top of the tray 5.

[0029] An observation window is provided on one side of the outer wall of the test chamber 11. The test chamber 11 is filled with litmus solution. The observation window allows the staff to observe the color of the litmus solution in the test chamber 11 to understand whether the exhaust gas still contains acid. A bracket 17 is welded and fixed to the other end of the top of the test chamber 11. The arc-shaped inner wall of the bracket 17 is adapted to the bottom of the outer wall of the absorption cylinder 14. The absorption cylinder 14 is filled with calcium hydroxide particles. The calcium hydroxide particles can absorb the mild acid mist in the exhaust gas.

[0030] Working principle:

[0031] During operation, the acid mist gas is transported to the fixed pipe 7 through an external fan and pipeline and discharged from the bottom. The discharged gas flows upward along the spiral channel formed in the reaction cylinder 1 by the spiral guide plate 8, allowing the gas to have more time to react with the solution in the reaction cylinder 1. The reacted gas enters the test chamber 11 through the connecting pipe 9 and the air inlet pipe 12. After contacting the litmus solution in the test chamber 11, the color change of the litmus solution determines whether there is residual acid mist in the gas. If the litmus solution gradually turns red, the sodium hydroxide solution in the reaction cylinder 1 is replaced. The gas then enters the absorption cylinder 14 through the exhaust pipe 13, where the calcium hydroxide particles in the absorption cylinder 14 absorb the residual mild acid mist.

[0032] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", 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 the present invention 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 the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sulfuric acid production acid mist absorption device, comprising a reaction cylinder (1), characterized in that, The top of the reaction cylinder (1) is connected to a top cover (6), and a fixing pipe (7) is welded through the top of the top cover (6). A spiral guide plate (8) is welded to the outer wall of the fixing pipe (7), and the outer diameter of the spiral guide plate (8) is adapted to the inner diameter of the reaction cylinder (1). A liquid replenishment pipe (10) is inserted and fixed on one side of the top of the top cover (6), and a connecting pipe (9) is inserted and fixed on the other side of the top of the top cover (6). A test chamber (11) is provided on one side of the reaction cylinder (1), and an air inlet pipe (12) connected to the connecting pipe (9) is inserted and fixed at one end of the top of the test chamber (11). An exhaust pipe (13) is inserted and fixed at the other end of the top of the test chamber (11), and an absorption cylinder (14) is inserted at the top of the exhaust pipe (13). A ventilation pipe (15) is inserted and fixed at the top of the outer wall of the absorption cylinder (14), and a cylinder cover (16) is inserted at one end of the absorption cylinder (14).

2. The sulfuric acid production acid mist absorption device according to claim 1, characterized in that, A drain pipe (2) is welded through and fixed to the bottom of the reaction cylinder (1), and a control valve is installed on the drain pipe (2). Sodium hydroxide solution is injected into the reaction cylinder (1).

3. The sulfuric acid production acid mist absorption device according to claim 1, characterized in that, The outer wall of the reaction cylinder (1) is welded and fixed with a fixing ring (3), and the bottom of the fixing ring (3) is welded and fixed with equally spaced support legs (4) along the annular shape. A tray (5) is welded and fixed on one side of the annular outer wall of the fixing ring (3).

4. The sulfuric acid production acid mist absorption device according to claim 3, characterized in that, The top of the tray (5) is provided with a placement slot, and the placement slot is compatible with the bottom specifications of the test box (11).

5. The sulfuric acid production acid mist absorption device according to claim 1, characterized in that, The test chamber (11) has an observation window on one side of its outer wall, and litmus solution is injected into the test chamber (11).

6. The sulfuric acid production acid mist absorption device according to claim 1, characterized in that, The test chamber (11) is welded to the other end of the top with a bracket (17), and the arc-shaped inner wall of the bracket (17) is adapted to the bottom of the outer wall of the absorption cylinder (14). The absorption cylinder (14) is filled with calcium hydroxide particles.

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