Efficient HCl gas absorption device structure

Abstract

The utility model belongs to the technical field of waste gas treatment equipment, and particularly relates to an efficient HCl gas absorption device structure. Through reasonable arrangement of the buffer tank, the multi-stage hydrochloric acid absorber, the hydrochloric acid storage tank, the demister, the multi-stage acid mist absorption tower, the matched circulating pump and the matched exhaust fan, the absorption efficiency of the HCl waste gas can be effectively improved, a byproduct hydrochloric acid can be conveniently recycled, and the HCl waste gas can be directly treated to reach the standard to be discharged; the device disclosed by the utility model is compact in overall structure, low in use and maintenance cost and easy to implement, and has the characteristics of high HCl recovery efficiency, high removal efficiency, economical operation, convenience in adjustment and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste gas treatment equipment, and particularly relates to a structure of an efficient HCl gas absorption device. Background Art

[0002] In the production process of the pharmaceutical and chemical industries, a large amount of high-concentration HCl (hydrogen chloride) waste gas is generated during the chlorination reaction. The existing waste gas treatment solutions usually adopt alkali liquor to absorb the HCl waste gas. This method has a low absorption efficiency for HCl and will produce a large amount of unusable by-product hydrochloric acid, which has no utilization value and increases the cost of end treatment.

[0003] With the continuous advancement of environmental governance work, higher requirements have been put forward for the emission index of HCl in the emission standards of each region. In new construction and renovation projects, key considerations should be given to the HCl treatment efficiency and the compliance of treatment products to ensure that the HCl waste gas can meet the emission standards after passing through the treatment device. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a structure of an efficient HCl gas absorption device, which has a compact overall structure, is convenient for use and maintenance, can effectively improve the absorption efficiency of HCl waste gas, and is convenient for the recovery and utilization of the absorbed by-product hydrochloric acid.

[0005] The technical solution adopted by the utility model to solve the above technical problem is as follows:

[0006] A structure of an efficient HCl gas absorption device includes a buffer tank 1. The inlet of the buffer tank 1 is connected to the waste gas to be treated, and the outlet of the buffer tank 1 is connected to a multi-stage hydrochloric acid absorber group formed by connecting multiple hydrochloric acid absorbers 2 in series. The outlet end of the multi-stage hydrochloric acid absorber group is connected to a multi-stage acid mist absorption tower group formed by connecting multiple acid mist absorption towers 6 in series after passing through a demister 5. The outlet end of the multi-stage acid mist absorption tower group is connected to an exhaust fan 8.

[0007] Further, the inlet end of the first hydrochloric acid absorber in the multi-stage hydrochloric acid absorber group is connected to the outlet of the buffer tank 1, the inlet and outlet ends of adjacent two hydrochloric acid absorbers are connected in series in turn, and the outlet end of the last hydrochloric acid absorber is connected to the input end of the demister 5.

[0008] Further, each hydrochloric acid absorber 2 in the multi-stage hydrochloric acid absorber group includes a hydrochloric acid absorption chamber and a cooling water circuit. The bottom of each hydrochloric acid absorption chamber is connected to a corresponding hydrochloric acid storage tank 3; the top of the hydrochloric acid storage tank 3 is connected to an absorption liquid supply pipeline 11, and the bottom of the hydrochloric acid storage tank 3 is connected to the top of the hydrochloric acid absorption chamber through an absorber circulation pump 4.

[0009] Further, the water inlet of the cooling water circuit is connected to the cooling water inlet pipe 9, and the water outlet of the cooling water circuit is connected to the cooling water return pipe 10.

[0010] Further, the gas inlet end of the first acid mist absorber in the multi-stage acid mist absorber group is connected to the output end of the demister 5, the gas inlet ends and gas outlet ends of adjacent two acid mist absorbers are connected in series in sequence, and the gas outlet end of the last acid mist absorber is connected to the exhaust fan 8.

[0011] Further, each acid mist absorber 6 in the multi-stage acid mist absorber group is provided with a circulating spray pipeline, and an acid mist absorber circulating pump 7 is arranged on the circulating spray pipeline.

[0012] Further, a condensate liquid outlet is arranged at the bottom of the demister 5, and the condensate liquid outlet is connected to the corresponding hydrochloric acid storage tank 3 at the bottom of the last hydrochloric acid absorber through a return pipeline 12.

[0013] Further, a mist droplet filter screen is arranged inside the demister 5.

[0014] The present utility model has the following main advantages compared with the prior art:

[0015] 1. The present utility model provides a high-efficiency HCl gas absorption device structure. Through the reasonable arrangement of a buffer tank, multi-stage hydrochloric acid absorbers, hydrochloric acid storage tanks, a demister, multi-stage acid mist absorbers and supporting circulating pumps and exhaust fans, the absorption efficiency of HCl waste gas can be effectively improved, and it is convenient for the recycling of the absorption by-product hydrochloric acid. The HCl waste gas can be directly treated to meet the discharge standards.

[0016] 2. The overall structure of the present utility model is compact, the use and maintenance cost is low, and it is easy to implement. It has the characteristics of high HCl recovery efficiency, high removal efficiency, economical operation and convenient adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the overall schematic diagram of a high-efficiency HCl gas absorption device structure of the present utility model.

[0018] In the figure: 1. Buffer tank; 2. Hydrochloric acid absorber; 3. Hydrochloric acid storage tank; 4. Absorber circulating pump; 5. Demister; 6. Acid mist absorber; 7. Acid mist absorber circulating pump; 8. Exhaust fan; 9. Cooling water inlet pipe; 10. Cooling water return pipe; 11. Absorption liquid supply pipe; 12. Return pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0020] It should be noted that according to the needs of implementation, each step / component described in this application can be split into more steps / components, or two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the objectives of the present utility model.

[0021] Embodiment 1. This embodiment provides a structure of an efficient HCl gas absorption device, as Figure 1 shown, including a buffer tank 1. The inlet of the buffer tank 1 is connected to the waste gas to be treated, and the outlet of the buffer tank 1 is connected to a multi-stage hydrochloric acid absorber group formed by connecting a plurality of hydrochloric acid absorbers 2 in series. The outlet end of the multi-stage hydrochloric acid absorber group is connected to a multi-stage acid mist absorption tower group formed by connecting a plurality of acid mist absorption towers 6 in series after passing through a demister 5. The outlet end of the multi-stage acid mist absorption tower group is connected to an exhaust fan 8.

[0022] Further, the inlet end of the first hydrochloric acid absorber in the multi-stage hydrochloric acid absorber group is connected to the outlet of the buffer tank 1, the inlet ends and outlet ends of adjacent two hydrochloric acid absorbers are connected in series in sequence, and the outlet end of the last hydrochloric acid absorber is connected to the input end of the demister 5.

[0023] Further, each hydrochloric acid absorber 2 in the multi-stage hydrochloric acid absorber group includes a hydrochloric acid absorption chamber and a cooling water circuit. The bottom of each hydrochloric acid absorption chamber is connected to a corresponding hydrochloric acid storage tank 3; the top of the hydrochloric acid storage tank 3 is connected to an absorption liquid supply pipeline 11, and the bottom of the hydrochloric acid storage tank 3 is connected to the top of the hydrochloric acid absorption chamber through an absorber circulation pump 4.

[0024] Further, the inlet of the cooling water circuit is connected to a cooling water inlet pipeline 9, and the outlet of the cooling water circuit is connected to a cooling water return pipeline 10.

[0025] Further, the inlet end of the first acid mist absorption tower in the multi-stage acid mist absorption tower group is connected to the output end of the demister 5, the inlet ends and outlet ends of adjacent two acid mist absorption towers are connected in series in sequence, and the outlet end of the last acid mist absorption tower is connected to the exhaust fan 8.

[0026] Further, each acid mist absorption tower 6 in the multi-stage acid mist absorption tower group is provided with a circulating spray pipeline, and an acid mist absorption tower circulation pump 7 is provided on the circulating spray pipeline.

[0027] Furthermore, a condensate liquid outlet is provided at the bottom of the demister 5, and the condensate liquid outlet is connected to the hydrochloric acid storage tank 3 corresponding to the bottom of the last hydrochloric acid absorber through a reflux pipeline 12.

[0028] Furthermore, a mist droplet filter screen is provided inside the demister 5.

[0029] Embodiment 2: A high-efficiency HCl gas absorption device structure provided in this embodiment utilizes the characteristic that HCl is highly soluble in water, uses pure water as an absorption liquid to absorb HCl gas, and multiple hydrochloric acid absorbers can be selected for absorption according to engineering needs. Moreover, the by-product hydrochloric acid generated by absorption can be recycled; after the high-concentration HCl waste gas is treated by this device structure, the HCl emission concentration in the waste gas can be ≤10 mg / m³, thus meeting the emission standard. As a whole, it has the characteristics of high HCl recovery efficiency, high removal efficiency, economical operation, and convenient adjustment.

[0030] This device structure specifically includes: a buffer tank, a hydrochloric acid absorber, a hydrochloric acid storage tank, an absorber circulation pump, a demister, an acid mist absorption tower, an acid mist absorption tower circulation pump, and an exhaust fan;

[0031] Among them, the hydrochloric acid absorber can adopt a graphite tube or graphite block falling film absorber;

[0032] Furthermore, this device can not only treat HCl waste gas, but also treat waste gases such as NH₃. For those that can use water as an absorption medium, this device can be considered for recycling and treatment.

[0033] Furthermore, the hydrochloric acid absorber can adopt three stages or multiple stages.

[0034] Furthermore, this device is provided with a demister, and the demister can adopt wire meshes, filter plates, filter bags, etc.

[0035] Furthermore, the acid mist absorption tower can adopt two stages or multiple stages.

[0036] Furthermore, the acid mist absorption tower can adopt forms such as an empty tower, a packed tower, a plate tower, a bubble cap tower, etc.

[0037] Furthermore, the acid mist absorption tower can select liquid alkali, acid, etc. according to the components of the absorbed waste gas.

[0038] During specific use:

[0039] The HCl-containing waste gas first passes through the buffer tank of this device for uniform mixing, and then passes through multiple-stage hydrochloric acid absorbers to absorb the HCl gas. The hydrochloric acid absorbers are connected with cooling water pipelines to reduce the temperature of the circulating absorption liquid, and the absorption liquid (water) in the hydrochloric acid storage tank is circulated into the hydrochloric acid absorbers through the absorber circulation pump, so that the absorption liquid forms a liquid film in the absorber to fully contact with the HCl gas, realizing efficient absorption; the treated HCl gas successively enters the next-stage hydrochloric acid absorbers for further absorption;

[0040] The HCl gas absorbed by multiple-stage hydrochloric acid absorbers then passes through a demister to remove large particle droplets, and the condensed liquid converges at the bottom and then flows back to the hydrochloric acid storage tank. Finally, a small amount of acid mist is absorbed by the multi-stage acid mist absorption tower at the end, and then discharged up to the standard through a fan.

[0041] Furthermore, the utility model can be adjusted according to the concentration of HCl that needs to be recycled. After the concentration in the front-end hydrochloric acid storage tank meets the use requirements, it can be discharged and recycled in time; the hydrochloric acid content in the end hydrochloric acid storage tank is relatively low, and the liquid in the storage tank can be pumped into the front-end storage tank through the absorber circulation pump to absorb HCl again to increase the hydrochloric acid concentration.

[0042] Furthermore, the utility model can use hydrochloric acid absorbers to absorb HCl gas, recycle by-product hydrochloric acid, and directly treat the HCl waste gas up to the standard for discharge.

[0043] The exhaust gas volume of the implementation project in this embodiment is 1200 m3 / h (standard, dry basis). The HCl waste gas is treated by using the HCl gas absorption device structure of the utility model. The inlet HCl concentration is about 60% (v), and the outlet HCl concentration ≤ 10 mg / Nm3. From the above data, it can be seen that the treated gas meets the emission standard, and the device structure has been successfully applied in this project.

[0044] Furthermore, the parts not detailed in this application are the same as the prior art or are implemented by using the prior art.

[0045] To sum up:

[0046] 1. The utility model provides a high-efficiency HCl gas absorption device structure. Through the reasonable arrangement of a buffer tank, multiple-stage hydrochloric acid absorbers, hydrochloric acid storage tanks, demisters, multi-stage acid mist absorption towers and supporting circulation pumps and exhaust fans, the absorption efficiency of HCl waste gas can be effectively improved, and it is convenient for the recovery and utilization of by-product hydrochloric acid. The HCl waste gas can be directly treated up to the standard for discharge;

[0047] 2. The overall structure of the utility model is compact, with low use and maintenance costs, easy to implement, and has the characteristics of high HCl recovery efficiency, high removal efficiency, economical operation, and convenient adjustment.

[0048] The above embodiments are only used to illustrate the design concept and features of the present utility model, and the purpose is to enable those skilled in the art to understand the content of the present utility model and implement it accordingly. The protection scope of the present utility model is not limited to the above embodiments. Therefore, all equivalent changes or modifications made according to the principles and design concepts disclosed by the present utility model are within the protection scope of the present utility model.

Claims

1. An efficient HCl gas absorption device structure, characterized in that: The invention comprises a buffer tank (1), wherein an air inlet of the buffer tank (1) is connected to waste gas to be treated, and an air outlet of the buffer tank (1) is connected to a multi-stage hydrochloric acid absorber group formed by connecting a plurality of hydrochloric acid absorbers (2) in series, and an air outlet of the multi-stage hydrochloric acid absorber group is connected to a multi-stage acid mist absorption tower group formed by connecting a plurality of acid mist absorption towers (6) in series after passing through a demister (5), and an exhaust fan (8) is connected to the air outlet of the multi-stage acid mist absorption tower group.

2. The structure of an efficient HCl gas absorption device according to claim 1, characterized in that: The air inlet end of the first hydrochloric acid absorber in the multi-stage hydrochloric acid absorber group is connected to the air outlet of the buffer tank (1), the air inlet ends and air outlet ends of two adjacent hydrochloric acid absorbers are connected in series in sequence, and the air outlet end of the last hydrochloric acid absorber is connected to the input end of the demister (5).

3. The structure of an efficient HCl gas absorption device according to claim 2, characterized in that: Each hydrochloric acid absorber (2) in the multi-stage hydrochloric acid absorber group comprises a hydrochloric acid absorption chamber and a cooling water circuit, and the bottom of the hydrochloric acid absorption chamber is connected to a corresponding hydrochloric acid storage tank (3); the top of the hydrochloric acid storage tank (3) is connected to an absorption liquid supply pipeline (11), and the bottom of the hydrochloric acid storage tank (3) is connected to the top of the hydrochloric acid absorption chamber through an absorber circulation pump (4).

4. The structure of an efficient HCl gas absorption device according to claim 3, characterized in that: The water inlet of the cooling water circuit is connected to a cooling water inlet pipeline (9), and the water outlet of the cooling water circuit is connected to a cooling water return pipeline (10).

5. The structure of an efficient HCl gas absorption device according to claim 3, characterized in that: The air inlet end of the first acid mist absorption tower in the multi-stage acid mist absorption tower group is connected to the output end of the demister (5), the air inlet ends and air outlet ends of two adjacent acid mist absorption towers are sequentially connected in series, and the air outlet end of the last acid mist absorption tower is connected to the exhaust fan (8).

6. The structure of an efficient HCl gas absorption device according to claim 5, characterized in that: Each acid mist absorption tower (6) in the multi-stage acid mist absorption tower group is provided with a circulation spray pipeline, and the circulation spray pipeline is provided with an acid mist absorption tower circulation pump (7).

7. The structure of an efficient HCl gas absorption device according to claim 5, characterized in that: The bottom of the defoamer (5) is provided with a condensate outlet, and the condensate outlet is connected to the hydrochloric acid storage tank (3) corresponding to the bottom of the last hydrochloric acid absorber through a reflux pipe (12).

8. The structure of an efficient HCl gas absorption device according to claim 1, characterized in that: The defoamer (5) is provided with a mist filter.

Images