Tail gas absorption system in hydrochloric acid loading process

Abstract

The utility model belongs to the technical field of hydrochloric acid absorption processes, and particularly discloses a tail gas absorption system in a hydrochloric acid loading process, which comprises an absorption tower, a layer of filter element is arranged on the inner wall of a barrel of the absorption tower, a water inlet at the top of the absorption tower is connected with an absorption tower water adding pipe, and a gas inlet of the absorption tower is connected with an exhaust fan. A liquid outlet in the bottom of the absorption tower is connected with an absorption liquid collecting pool; the absorption liquid collecting pool is connected with an absorption liquid conveying pump; the absorption liquid conveying pump is connected with a hydrochloric acid pipeline; the hydrochloric acid pipeline is connected with a circulating pipeline; according to the tail gas absorption system in the hydrochloric acid loading process, through the combined action of the air exhaust fan, the absorption tower and the absorption liquid conveying pump, circulating absorption is achieved, hydrogen chloride tail gas is absorbed more sufficiently, the working environment in the hydrochloric acid loading process is improved, and meanwhile the personal safety of loading workers is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrochloric acid absorption process, and particularly relates to an exhaust gas absorption system in the process of hydrochloric acid loading. Background Art

[0002] Hydrochloric acid is an important chemical raw material. As a product, it needs to be loaded onto vehicles for sale. During the loading process, hydrogen chloride exhaust gas will evaporate. If not recycled, it can pollute the atmospheric environment. However, traditional recovery equipment directly passes the hydrogen chloride exhaust gas into an aqueous solution. When the bubbles formed are large, the hydrogen chloride molecules in the bubbles cannot be fully absorbed by the aqueous solution, resulting in incomplete treatment of the hydrogen chloride exhaust gas, causing atmospheric pollution and easily forming acid rain.

[0003] Therefore, it is necessary to design an exhaust gas absorption system during the hydrochloric acid loading process to fully absorb the hydrogen chloride exhaust gas volatilized during the loading of the hydrochloric acid tanker, improve the working environment during the hydrochloric acid loading process, and reduce environmental pollution. Utility Model Content

[0004] In response to the problems of the prior art, the purpose of the present invention is to provide an exhaust gas absorption system for the hydrochloric acid loading process, so as to solve the problem that when the hydrogen chloride exhaust gas is directly introduced into the aqueous solution, when the bubbles formed are large, the hydrogen chloride molecules in the bubbles cannot be fully absorbed by the aqueous solution.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A tail gas absorption system for a hydrochloric acid loading process comprises an absorption tower, wherein a filter element is provided on the inner wall of the cylinder of the absorption tower, a water inlet of the absorption tower is connected to an absorption tower water supply pipe, an air inlet of the absorption tower is connected to an exhaust fan, an air inlet of the exhaust fan is connected to a hydrogen chloride tail gas pipeline, a liquid discharge port at the bottom of the absorption tower is connected to an absorption liquid collection tank, a liquid outlet of the absorption liquid collection tank is connected to an absorption liquid delivery pump, an outlet of the absorption liquid delivery pump is connected to a hydrochloric acid pipeline, the other end of the hydrochloric acid pipeline is connected to a circulation pipeline, the other end of the circulation pipeline is connected to the circulation liquid inlet of the absorption tower, and a circulation valve is provided on the circulation pipeline.

[0007] More preferably, a water supply pipe valve is provided on the absorption tower water supply pipe.

[0008] More preferably, the gas outlet at the top of the absorption tower is connected to a tail gas exhaust pipe.

[0009] More preferably, an observation mirror is provided on the top of the absorption tower.

[0010] More preferably, a plurality of drainage holes are provided on the top of the filter element.

[0011] More preferably, the other end of the hydrochloric acid pipeline is connected to a collecting pipeline, the other end of the collecting pipeline is connected to a hydrochloric acid storage tank, and a collecting valve is provided on the collecting pipeline.

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

[0013] The tail gas absorption system for the hydrochloric acid loading process provided by the utility model achieves the purpose of absorbing tail gas during the hydrochloric acid tanker loading process through the combined action of an exhaust fan and an absorption tower, and utilizes an absorption liquid delivery pump to realize cyclic absorption, so that the hydrogen chloride tail gas is absorbed more fully; the absorption liquid collection tank and the absorption liquid delivery pump collect the hydrochloric acid into a hydrochloric acid storage tank for subsequent further recycling and utilization. The utility model improves the working environment during the hydrochloric acid loading process and ensures the personal safety of the loading workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a process flow chart of the utility model;

[0015] The meanings of the accompanying symbols are as follows: 1. Exhaust fan; 2. Absorption tower; 3. Absorption liquid collection tank; 4. Absorption liquid delivery pump; 5. Tail gas exhaust pipe; 6. Absorption tower water pipe; 7. Water pipe valve; 8. Observation mirror; 9. Drain hole; 10. Filter element; 11. Hydrochloric acid pipeline; 12. Circulation pipeline; 13. Collection pipeline; 14. Circulation valve; 15. Collection valve; 16. Hydrochloric acid storage tank; 17. Hydrogen chloride tail gas pipeline. DETAILED DESCRIPTION

[0016] 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.

[0017] In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "back," "left," "right," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, in the description of the present invention, "several" means two or more, unless otherwise expressly and specifically defined.

[0018] like Figure 1As shown, a tail gas absorption system for the hydrochloric acid loading process includes an absorption tower 2. A filter element 10 is provided on the inner wall of the cylinder of the absorption tower 2. The filter element 10 is made of filter cotton. The filter element 10 is fixed to the absorption tower 2 with a wire mesh as a whole, which can slow down the water speed, make the water and gas fully contact, and absorb more thoroughly. A plurality of drain holes 9 are provided on the top of the filter element 10 to prevent residual liquid from accumulating in the liquid collection tray. The water inlet at the top of the absorption tower 2 is connected to the absorption tower water supply pipe 6. The absorption tower water supply pipe 6 is provided with a water supply pipe valve 7 to control the amount of water added to the absorption tower 2. The air outlet at the top of the absorption tower 2 is connected to the tail gas exhaust pipe 5 to discharge low-concentration gas that meets the emission standards. An observation mirror 8 is provided on the top of the absorption tower 2 to observe the liquid level of the added water. The air inlet of the absorption tower 2 is connected to the exhaust fan 1, the air inlet of the exhaust fan 1 is connected to the hydrogen chloride tail gas pipeline 17, the discharge port at the bottom of the absorption tower 2 is connected to the absorption liquid collecting tank 3, the liquid outlet of the absorption liquid collecting tank 3 is connected to the absorption liquid delivery pump 4, the outlet of the absorption liquid delivery pump 4 is connected to the hydrochloric acid pipeline 11, the other end of the hydrochloric acid pipeline 11 is connected to the circulation pipeline 12, the other end of the circulation pipeline 12 is connected to the circulation liquid inlet of the absorption tower 2, and the circulation pipeline 12 is provided with a circulation valve 14; the other end of the hydrochloric acid pipeline 11 is connected to the collecting pipeline 13, the other end of the collecting pipeline 13 is connected to the hydrochloric acid storage tank 16, and the collecting pipeline 13 is provided with a collecting valve 15.

[0019] When the utility model is used, the operator opens the water adding pipe valve 7 before loading hydrochloric acid, first adds production water into the absorption tower 2, observes the water level through the sight glass 8, and closes the water adding pipe valve 7 when the water fully soaks the filter element 10. When loading, turn on the exhaust fan 1, and draw the exhaust gas generated during the loading process into the absorption tower 2 through the exhaust branch 1 for absorption. Use the absorption liquid delivery pump 4 to extract the absorption liquid from the drain port at the bottom of the absorption tower 2, flow through the hydrochloric acid pipeline 11, open the circulation valve 14, flow through the circulation pipeline 12, and then pump into the circulation liquid inlet at the top of the absorption tower 2, so that the exhaust gas and the water in the absorption tower 2 can fully circulate and absorb. After a certain period of absorption, take samples from the drain port at the bottom of the absorption tower 2 to analyze the concentration of the absorption liquid. When the concentration reaches the collection requirement, the absorption liquid in the absorption tower 2 is discharged into the absorption liquid collection pool 3 through the drain port. When the absorption liquid collection pool 3 reaches a certain liquid level, close the circulation valve 14, open the collection valve 15, and use the absorption liquid delivery pump 4 to extract the absorption liquid from the absorption liquid collection pool 3. It flows through the hydrochloric acid pipeline 11 and the collection pipeline 13 in turn, and the absorption liquid is collected in the hydrochloric acid storage tank 16 for subsequent use. At the same time, when low-concentration gas passes through the absorption tower 2 and reaches the top of the filter element 10, the gas concentration reaches the emission standard and is discharged into the atmosphere through the tail gas exhaust pipe 5.

[0020] The tail gas absorption system for the hydrochloric acid loading process provided by the utility model achieves the purpose of absorbing tail gas during the hydrochloric acid tanker loading process through the combined action of an exhaust fan and an absorption tower, and utilizes an absorption liquid delivery pump to realize cyclic absorption, so that the hydrogen chloride tail gas is absorbed more fully; the absorption liquid collection tank and the absorption liquid delivery pump collect the hydrochloric acid into a hydrochloric acid storage tank for subsequent further recycling and utilization. The utility model improves the working environment during the hydrochloric acid loading process and ensures the personal safety of the loading workers.

[0021] 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 tail gas absorption system for a hydrochloric acid loading process, comprising an absorption tower, characterized in that: A filter element (10) is provided on the inner wall of the cylinder of the absorption tower (2); the water inlet of the absorption tower (2) is connected to an absorption tower water supply pipe (6); the air inlet of the absorption tower (2) is connected to an exhaust fan (1); the air inlet of the exhaust fan (1) is connected to a hydrogen chloride tail gas pipeline (17); the liquid discharge port at the bottom of the absorption tower (2) is connected to an absorption liquid collection tank (3); the liquid outlet of the absorption liquid collection tank (3) is connected to an absorption liquid delivery pump (4); the outlet of the absorption liquid delivery pump (4) is connected to a hydrochloric acid pipeline (11); the other end of the hydrochloric acid pipeline (11) is connected to a circulation pipeline (12); the other end of the circulation pipeline (12) is connected to the circulation liquid inlet of the absorption tower (2); and a circulation valve (14) is provided on the circulation pipeline (12).

2. The tail gas absorption system for a hydrochloric acid loading process according to claim 1, characterized in that: The absorption tower water supply pipe (6) is provided with a water supply pipe valve (7).

3. The tail gas absorption system for a hydrochloric acid loading process according to claim 1, characterized in that: The top gas outlet of the absorption tower (2) is connected to a tail gas exhaust pipe (5).

4. The tail gas absorption system for a hydrochloric acid loading process according to claim 1, characterized in that: An observation mirror (8) is provided on the top of the absorption tower (2).

5. The tail gas absorption system for a hydrochloric acid loading process according to claim 1, characterized in that: The top of the filter element (10) is provided with a plurality of drain holes (9).

6. The tail gas absorption system for a hydrochloric acid loading process according to claim 1, characterized in that: The other end of the hydrochloric acid pipeline (11) is connected to a collecting pipeline (13), and the other end of the collecting pipeline (13) is connected to a hydrochloric acid storage tank (16). A collecting valve (15) is provided on the collecting pipeline (13).

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