Hydrochloric acid recovery system

Abstract

The utility model provides a hydrochloric acid recovery system and relates to the technical field of hydrochloric acid recovery. The absorption tower is communicated with the feeding pipe, a circulating pipeline is arranged between a recovery tank and the absorption tower, the absorption mechanism is communicated with the absorption tower and the recovery tank, the absorption mechanism comprises a first absorption tank and a second absorption tank which are communicated with each other, and gas dispersing components are arranged in the first absorption tank and the second absorption tank. The gas dispersing assembly in the first absorption tank is communicated with the absorption tower, the gas dispersing assembly in the second absorption tank is communicated with the first absorption tank, and the first absorption tank and the second absorption tank are communicated with the recovery tank. When the absorption efficiency of the absorption tower is reduced, the hydrogen chloride absorption capacity can be improved through the external absorption mechanism.

Description

Technical Field

[0001] This utility model relates to the field of hydrochloric acid recovery technology, and specifically to a hydrochloric acid recovery system. Background Technology

[0002] Hydrochloric acid is an aqueous solution of hydrogen chloride. It has a wide range of industrial applications. Hydrochloric acid is a colorless and transparent liquid with a strong pungent odor and high corrosiveness. In the chemical industry, hydrochloric acid has many important applications and plays a decisive role in the quality of products. Hydrochloric acid can be used to pickle steel and is also a chemical reagent required for the large-scale preparation of many inorganic and organic compounds.

[0003] In the existing technology, hydrochloric acid is recovered by absorbing hydrogen chloride in an absorption tower. When the absorption efficiency of hydrogen chloride in the absorption tower decreases, the pressure in the absorption tower gradually increases, which not only affects safety, but also reduces the amount of hydrogen chloride absorbed. Utility Model Content

[0004] The purpose of this invention is to develop a hydrochloric acid recovery system that can increase the absorption of hydrogen chloride by using an external absorption mechanism when the absorption efficiency of the absorption tower decreases.

[0005] This utility model is achieved through the following technical solution:

[0006] A hydrochloric acid recovery system, comprising:

[0007] Feed pipe;

[0008] The absorption tower is connected to the feed pipe;

[0009] The recovery tank is connected to the absorption tower by a circulation pipeline;

[0010] The absorption mechanism is connected to the absorption tower and recovery tank;

[0011] The absorption mechanism includes a first absorption tank and a second absorption tank that are connected to each other. The first absorption tank and the second absorption tank are equipped with a gas dispersing component. The gas dispersing component in the first absorption tank is connected to the absorption tower. The gas dispersing component in the second absorption tank is connected to the first absorption tank. The first absorption tank and the second absorption tank are connected to a recovery tank.

[0012] Optionally, the air dissipation assembly includes an air dissipation cylinder with an open top and a closed bottom, and the outer wall of the air dissipation cylinder is evenly covered with multiple air holes;

[0013] The top of the gas diffuser in the first absorption tank is connected to a gas delivery pipe, which is connected to the top of the absorption tower. A solenoid valve is installed on the gas delivery pipe.

[0014] The top of the gas diffuser in the second absorption tank is connected to a gas supply pipe, which is connected to the top of the first absorption tank.

[0015] Optionally, the air diffuser is provided with multiple air diffuser columns, which are perpendicular to the air diffuser and are evenly distributed on the air diffuser.

[0016] Optionally, the air-dispersing column has a hollow structure inside, the hollow cavity inside the air-dispersing column is connected to the inside of the air-dispersing cylinder, and the air-dispersing column is evenly covered with multiple air holes.

[0017] Optionally, the gas diffuser is rotatably located at the bottom of the first or second absorption tank where the gas diffuser assembly is located, and the bottom of the first or second absorption tank is provided with a motor that is drively connected to the gas diffuser.

[0018] Optionally, stirring blades are provided on the outer wall of the air diffuser at the lower part of the air diffuser arrangement area.

[0019] Optionally, both the first absorption tank and the second absorption tank are connected to a water supply pipe, and both the first absorption tank and the second absorption tank are provided with a return pipe at the bottom that is connected to the recovery tank.

[0020] Optionally, the absorption tower is equipped with packing material, the feed pipe is connected to the side wall of the absorption tower below the packing material, and the absorption tower above the packing material is equipped with spray heads.

[0021] Optionally, the spray head is connected to an infusion pipe, the infusion pipe is connected to the bottom of the recovery tank, the infusion pipe is equipped with an infusion pump, the infusion pipe near the recovery tank is connected to a water infusion pipe, the bottom of the absorption tower is connected to the recovery tank with an outlet pipe, and the bottom of the recovery tank is equipped with a recovery pipe.

[0022] Optionally, a safety valve is provided at the top of the absorption tower, and a pressure gauge is provided inside the absorption tower.

[0023] The beneficial effects of this utility model are:

[0024] This invention allows hydrogen chloride from the top of the absorption tower to be sequentially introduced into the first and second absorption tanks, achieving two-stage hydrogen chloride absorption. This avoids the pressure increase inside the absorption tower due to low hydrogen chloride absorption efficiency, thus preventing the absorption amount from being affected. The gas diffuser in the first and second absorption tanks can rotate, driving the gas diffuser column and stirring blades to rotate, so that hydrogen chloride is evenly dispersed into the water. The water and hydrogen chloride are stirred, improving the absorption efficiency of water for hydrogen chloride and achieving the treatment of residual hydrogen chloride at the top of the absorption tower. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a system structure diagram of the present invention;

[0027] Figure 2 This is a structural diagram of the absorption mechanism.

[0028] Attached reference numerals: 1. Feed pipe; 2. Absorption tower; 3. Packing material; 4. Spray head; 5. Safety valve; 6. Liquid delivery pipe; 7. Liquid delivery pump; 8. Water delivery pipe; 9. Recovery tank; 10. Liquid outlet pipe; 11. Recovery pipe; 12. Gas delivery pipe; 13. Liquid return pipe; 14. Gas supply pipe; 15. First absorption tank; 16. Second absorption tank; 17. Water replenishment pipe; 18. Gas diffuser; 19. Gas diffuser column; 20. Agitator blade; 21. Motor. Detailed Implementation

[0029] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0030] In the description of this invention, 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," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0031] 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.

[0032] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0033] like Figure 1 and Figure 2 As shown, this utility model discloses a hydrochloric acid recovery system, including an absorption tower 2, a recovery tank 9, and an absorption mechanism. Hydrogen chloride in the absorption tower 2 is absorbed by water or dilute acid. The acid solution that absorbs hydrogen chloride in the absorption tower 2 flows into the recovery tank 9. The dilute acid in the recovery tank 9 can be pumped into the absorption tower 2 for hydrogen chloride absorption. Excess hydrogen chloride in the absorption tower 2 can be passed into the absorption mechanism for absorption.

[0034] The absorption tower 2 is equipped with packing material 3. The side wall of the absorption tower 2 below the packing material 3 is connected to the feed pipe 1. The absorption tower 2 above the packing material 3 is equipped with a spray head 4. The spray head 4 is connected to a liquid delivery pipe 6. The liquid delivery pipe 6 is connected to the bottom of the recovery tank 9. The liquid delivery pipe 6 is equipped with a liquid delivery pump 7. The liquid delivery pipe 6 near the recovery tank 9 is connected to a water delivery pipe 8. The bottom of the absorption tower 2 is connected to the recovery tank 9 with an outlet pipe 10. The bottom of the recovery tank 9 is equipped with a recovery pipe 11, which outputs the acid in the recovery tank 9.

[0035] A safety valve 5 is installed at the top of the absorption tower 2, a pressure gauge is installed inside the absorption tower 2, and a gas supply pipe 12 is connected to the top of the absorption tower 2. The gas supply pipe 12 is connected to the absorption mechanism, and a solenoid valve is installed on the gas supply pipe 12.

[0036] The absorption mechanism includes a first absorption tank 15 and a second absorption tank 16. Both the first absorption tank 15 and the second absorption tank 16 are equipped with a gas dispersion assembly. The gas dispersion assembly includes a gas dispersion cylinder 18, which is closed at the bottom and open at the top. Multiple gas dispersion columns 19 are provided on the gas dispersion cylinder 18. The gas dispersion columns 19 are perpendicular to the gas dispersion cylinder 18 and are evenly arranged on the gas dispersion cylinder 18. A stirring blade 20 is also provided on the outer wall of the lower part of the gas dispersion cylinder 18. The stirring blade 20 is located in the lower part of the area where the gas dispersion columns 19 are arranged.

[0037] The diffuser column 19 has a hollow internal structure, and the internal cavity of the diffuser column 19 is connected to the internal cavity of the diffuser cylinder 18. The outer walls of both the diffuser cylinder 18 and the diffuser column 19 are covered with multiple air holes, which are evenly distributed.

[0038] The air diffuser 18 is rotatably located at the bottom of the first absorption tank 15 or the second absorption tank 16 where the air diffuser assembly is located. The bottom of the first absorption tank 15 or the second absorption tank 16 is provided with a motor 21 that is connected to the air diffuser 18 for transmission. The motor 21 drives the air diffuser 18 to rotate.

[0039] The gas supply pipe 12 is rotatably and sealed to the top of the gas diffuser 18 inside the first absorption tank 15. The top of the first absorption tank 15 is connected to the gas supply pipe 14, which is rotatably and sealed to the top of the gas diffuser 18 inside the second absorption tank 16. Both the first absorption tank 15 and the second absorption tank 16 are connected to the water supply pipe 17. Both the first absorption tank 15 and the second absorption tank 16 are provided with a return liquid pipe 13 at the bottom that is connected to the recovery tank 9.

[0040] Hydrogen chloride gas enters the absorption tower 2 through the feed pipe 1. Water or dilute acid is sprayed out from the spray head 4 to absorb hydrogen chloride in the absorption tower 2. Hydrogen chloride is absorbed at the bottom of the absorption tower 2 through the liquid outlet pipe 10 into the recovery tank 9. The dilute acid in the recovery tank 9 is pumped by the liquid transfer pump 7 and circulated into the spray head 4 through the liquid transfer pipe 6 and then into the absorption tower 2. Water is added to the liquid transfer pipe 6 through the water transfer pipe 8. If the hydrogen chloride absorption efficiency in absorption tower 2 decreases, the amount of hydrogen chloride increases, or the pressure gauge in absorption tower 2 detects a high pressure, the solenoid valve opens, allowing the hydrogen chloride at the top of absorption tower 2 to enter the absorption mechanism. The hydrogen chloride first enters the gas diffuser 18 in the first absorption tank 15. The motor 21 drives the gas diffuser 18 to rotate, and the hydrogen chloride is dispersed into the first absorption tank 15 through the pores on the surface of the gas diffuser 18 and the gas diffuser column 19. The hydrogen chloride at the top of the first absorption tank 15 then enters the gas diffuser 18 in the second absorption tank 16 through the gas supply pipe 14, and then exits through the pores on the surface of the gas diffuser 18 and the gas diffuser column 19 in the second absorption tank 16. Through the two absorptions in the first absorption tank 15 and the second absorption tank 16, the hydrogen chloride at the top of absorption tower 2 is absorbed. The acid in the first absorption tank 15 and the second absorption tank 16 is input into the recovery tank 9 through the return liquid pipe 13.

[0041] This invention allows hydrogen chloride from the top of absorption tower 2 to be sequentially introduced into the first absorption tank 15 and the second absorption tank 16, achieving two-stage hydrogen chloride absorption. This avoids the pressure increase inside absorption tower 2 due to low hydrogen chloride absorption efficiency, thus preventing the absorption amount from being affected. The gas diffuser 18 inside the first absorption tank 15 and the second absorption tank 16 can rotate, driving the gas diffuser column 19 and the stirring blade 20 to rotate, so that hydrogen chloride is evenly dispersed into the water. The water and hydrogen chloride are stirred, improving the absorption efficiency of water for hydrogen chloride and achieving the treatment of residual hydrogen chloride at the top of absorption tower 2.

[0042] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A hydrochloric acid recovery system, characterized in that, include: Feed pipe; The absorption tower is connected to the feed pipe; The recovery tank is connected to the absorption tower by a circulation pipeline; The absorption mechanism is connected to the absorption tower and recovery tank; The absorption mechanism includes a first absorption tank and a second absorption tank that are connected to each other. The first absorption tank and the second absorption tank are equipped with a gas dispersing component. The gas dispersing component in the first absorption tank is connected to the absorption tower. The gas dispersing component in the second absorption tank is connected to the first absorption tank. The first absorption tank and the second absorption tank are connected to a recovery tank.

2. The hydrochloric acid recovery system according to claim 1, characterized in that, The air dissipation assembly includes an air dissipation cylinder with an open top and a closed bottom, and the outer wall of the air dissipation cylinder is evenly covered with multiple air holes; The top of the gas diffuser in the first absorption tank is connected to a gas delivery pipe, which is connected to the top of the absorption tower. A solenoid valve is installed on the gas delivery pipe. The top of the gas diffuser in the second absorption tank is connected to a gas supply pipe, which is connected to the top of the first absorption tank.

3. The hydrochloric acid recovery system according to claim 2, characterized in that, The air diffuser is provided with multiple air diffuser columns, which are perpendicular to the air diffuser and are evenly distributed on the air diffuser.

4. The hydrochloric acid recovery system according to claim 3, characterized in that, The air-dispersing column has a hollow structure inside, and the hollow cavity inside the air-dispersing column is connected to the inside of the air-dispersing cylinder. The air-dispersing column is evenly covered with multiple air holes.

5. The hydrochloric acid recovery system according to claim 4, characterized in that, The gas diffuser is rotatably located at the bottom of the first or second absorption tank where the gas diffuser assembly is located, and the bottom of the first or second absorption tank is equipped with a motor that is connected to the gas diffuser for transmission.

6. The hydrochloric acid recovery system according to claim 5, characterized in that, The outer wall of the air diffuser at the lower part of the air diffuser column arrangement area is equipped with stirring blades.

7. The hydrochloric acid recovery system according to claim 6, characterized in that, Both the first absorption tank and the second absorption tank are connected to a water supply pipe, and both the first absorption tank and the second absorption tank are equipped with a return liquid pipe at the bottom that connects to the recovery tank.

8. The hydrochloric acid recovery system according to any one of claims 1 to 7, characterized in that, The absorption tower is equipped with packing material, the feed pipe is connected to the side wall of the absorption tower below the packing material, and the absorption tower above the packing material is equipped with spray heads.

9. The hydrochloric acid recovery system according to claim 8, characterized in that, The spray head is connected to an infusion pipe, which is connected to the bottom of the recovery tank. An infusion pump is installed on the infusion pipe, and a water infusion pipe is connected to the infusion pipe on the side of the infusion pump near the recovery tank. An outlet pipe is connected between the bottom of the absorption tower and the recovery tank, and a recovery pipe is installed at the bottom of the recovery tank.

10. The hydrochloric acid recovery system according to claim 8, characterized in that, A safety valve is installed at the top of the absorption tower, and a pressure gauge is installed inside the absorption tower.

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