Device for collecting hydrogen chloride gas and recovering hydrochloric acid

Abstract

The utility model relates to a device for capturing hydrogen chloride gas and recovering hydrochloric acid. The device comprises a condensation unit, an absorption unit and a neutralization unit which are sequentially connected in series, the inlet end of the condensing unit is communicated with an exhaust port of the tunnel kiln, and the condensing unit is used for condensing high-temperature tail gas exhausted from the exhaust port into liquid and absorbing and dissolving hydrogen chloride gas in the liquid; the absorption unit is used for further dissolving and recycling hydrogen chloride gas in the tail gas; and the neutralizing unit is used for neutralizing hydrogen chloride gas in the tail gas. The device for collecting hydrogen chloride gas and recovering hydrochloric acid has the advantages of recycling resources and being environment-friendly.

Description

TECHNICAL FIELD

[0001] The utility model relates to tail gas treatment technical field especially relates to a kind of trapping hydrogen chloride gas recovery hydrochloric acid device. BACKGROUND

[0002] Zirconium dioxide is calcined at high temperature in the production process, and tail gas containing hydrogen chloride gas is generated. If the tail gas is directly discharged into the air, it will cause fatal harm to human body and pollute the environment. Hydrochloric acid can be recovered by trapping hydrogen chloride gas in the tail gas, which can be reused in the production process, reducing the purchase of new hydrochloric acid by enterprises and thus reducing the cost of raw materials. SUMMARY

[0003] Therefore, the utility model discloses a kind of trapping hydrogen chloride gas recovery hydrochloric acid device, which has the advantages of resource recycling and environmental protection.

[0004] A kind of trapping hydrogen chloride gas recovery hydrochloric acid device, including condensing unit, absorption unit and neutralization unit that are sequentially connected;The inlet end of the condensing unit is communicated with the exhaust port of the tunnel kiln, for the high-temperature tail gas discharged in the exhaust port is condensed into liquid and absorbs the hydrogen chloride gas dissolved therein;The absorption unit is used for further dissolving and recovering hydrogen chloride gas in the tail gas;The neutralization unit is used for neutralizing and processing hydrogen chloride gas in the tail gas.

[0005] The trapping hydrogen chloride gas recovery hydrochloric acid device condenses water vapor and hydrogen chloride gas in the tail gas into liquid through the condensing unit first, reduces the difficulty of tail gas treatment, and then further dissolves and recovers hydrochloric acid through the absorption unit, improving the hydrochloric acid recovery efficiency.

[0006] Further, the condensing unit includes a first condensing part and a second condensing part connected in series, and the first condensing part is connected with a first liquid storage tank at the bottom, and the second condensing part is connected with a second liquid storage tank at the bottom.

[0007] Further, the first condensing part includes a plurality of condensers connected in parallel, the gas inlet end of each condenser is communicated with the exhaust port, the gas outlet end of each condenser is communicated with the gas inlet end of the second condensing part, and the bottom of each condenser is communicated with the first liquid storage tank.

[0008] Further, it further includes a plurality of pumps, the water inlet end of the pump is communicated with the first liquid storage tank or the second liquid storage tank, and the water outlet end of the pump is communicated with the top of the first condensing part or the top of the second condensing part.

[0009] Further, the absorption unit comprises a spray absorption tower and a plurality of packing absorption towers arranged in series, the spray absorption tower and the packing absorption towers are both sprayed by dilute hydrochloric acid solution through a circulating pump; the gas inlet end of the spray absorption tower is communicated with the gas outlet end of the secondary condensing part.

[0010] Further, a first air extractor is arranged between the spray absorption tower and the secondary condensing part.

[0011] Further, the liquid storage tank at the bottom of the packing absorption tower, the liquid storage tank at the bottom of the spray absorption tower, the second liquid storage tank and the first liquid storage tank are overflow-connected in sequence.

[0012] Further, a collection storage tank is further included, the first liquid storage tank is overflow-connected with the collection storage tank.

[0013] Further, the neutralization unit comprises a neutralization absorption tower, the gas inlet end of the neutralization absorption tower is connected with the gas outlet end of the tail end packing absorption tower, the gas outlet end of the neutralization absorption tower is provided with a second air extractor; the neutralization absorption tower is sprayed by alkaline solution through a circulating pump.

[0014] In order to better understand and implement, the following will be described in detail in combination with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the device for capturing hydrogen chloride gas and recovering hydrochloric acid.

[0016] In the figure: 1 - condensing unit; 11 - primary condensing part; 111 - first liquid storage tank; 112 - condenser; 12 - secondary condensing part; 121 - second liquid storage tank; 13 - pump; 2 - absorption unit; 21 - first air extractor; 22 - spray absorption tower; 23 - packing absorption tower; 3 - neutralization unit; 31 - second air extractor; 4 - tunnel kiln; 5 - collection storage tank. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0018] It should be noted that in the description of the utility model, the orientation or positional relationship indicated by the terms "vertical direction", "upper", "lower", "horizontal" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, "first", "second", "third", "fourth" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0019] It should be noted that in the description of the utility model, unless otherwise specified and limited, the terms "arrangement", "installation", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be connected through an intermediate medium, it can be the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0020] In the production process of zirconium dioxide, zirconium oxychloride is calcined at high temperature, and acidic octuple water zirconium oxychloride is calcined at high temperature to produce volatile water vapor and hydrogen chloride gas. The application provides a device for capturing hydrogen chloride gas and recycling hydrochloric acid, which is used for recycling and reusing the above-mentioned hydrogen chloride gas, and producing hydrochloric acid liquid. Please refer to Figure 1 The device for capturing hydrogen chloride gas and recycling hydrochloric acid comprises a condensation unit 1, an absorption unit 2 and a neutralization unit 3 which are sequentially connected in series.

[0021] The gas inlet end of the condensation unit 1 is communicated with the upper end exhaust port of the tunnel kiln 4, and during operation, the exhaust port discharges high-temperature tail gas (containing water vapor and hydrogen chloride gas), the condensation unit 1 condenses the water vapor in the high-temperature tail gas into liquid, and absorbs and dissolves the hydrogen chloride gas to become dilute hydrochloric acid liquid.

[0022] Further, the condensation unit 1 comprises a first condensation part 11 and a second condensation part 12. The first condensation part 11 and the second condensation part 12 are arranged in series with each other, and during operation, the remaining tail gas after condensation in the first condensation part 11 enters the second condensation part 12 for further condensation treatment, so as to improve the condensation rate of the whole water vapor and the solubility of hydrogen chloride gas in the liquid. Further, the bottom of the first condensation part 11 is communicated with a first liquid storage tank 111, and the bottom of the second condensation part 12 is communicated with a second liquid storage tank 121, for receiving the dilute hydrochloric acid liquid after condensation.

[0023] Further, the primary condensing part 11 comprises a plurality of condensers 112 arranged in parallel, for shortening the condensing time of the high-temperature tail gas and improving the condensing efficiency. The gas inlet ends of the plurality of condensers 112 are communicated with the exhaust port, the gas outlet ends of the plurality of condensers 112 are communicated with the gas inlet ends of the secondary condensing part 12, and the bottoms of the plurality of condensers 112 are communicated with the first liquid storage tank 111.

[0024] Further, a plurality of pumps 13 are arranged beside the primary condensing part 11 and the secondary condensing part 12. The water inlet ends of the pumps 13 are communicated with the first liquid storage tank 111 or the second liquid storage tank 121, and the water outlet ends of the pumps 13 are communicated with the top of the primary condensing part 11 or the top of the secondary condensing part 12, for pumping the dilute hydrochloric acid liquid in the first liquid storage tank 111 or the second liquid storage tank 121 to the top of the condensing unit 1 for spraying, improving the gas-liquid two-phase contact between the undissolved hydrogen chloride gas and the dilute hydrochloric acid liquid, and thus improving the concentration of the recovered hydrochloric acid liquid. In the embodiment, the pump 13 is a fluorine plastic pump.

[0025] The gas inlet end of the absorption unit 2 is communicated with the gas outlet end of the condensing unit 1, for re-processing the tail gas of the condensing unit 1 and absorbing and dissolving the hydrogen chloride gas therein. Further, a first air extractor 21 is arranged between the absorption unit 2 and the condensing unit 1, for smoothly sending the tail gas of the condensing unit 1 into the absorption unit 2 for processing, and the amount of gas entering the absorption unit 2 can be controlled by adjusting the flow rate of the first air extractor 21.

[0026] The absorption unit 2 comprises a spray absorption tower 22 and a plurality of packed absorption towers 23 arranged in series. In the embodiment, the spray absorption tower 22 and the packed absorption tower 23 are both sprayed with dilute hydrochloric acid liquid by a circulating pump. In operation, the spray absorption tower 22 first removes large particles of dust in the tail gas by collision, interception and other methods, while the hydrogen chloride gas is quickly dissolved in the spray liquid and falls into the liquid tank at the bottom of the spray absorption tower 22. The remaining tail gas after the treatment of the spray absorption tower 22 enters the packed absorption tower 23 for further treatment. The packing layer of the packed absorption tower 23 provides a large surface area for the contact between the tail gas and the spray liquid of the packed absorption tower 23, and the hydrogen chloride gas is dissolved in the spray liquid and falls into the liquid tank at the bottom of the packed absorption tower 23. In the absorption unit 2, the spray absorption tower 22 and the packed absorption tower 23 layer by layer dissolve and recover the hydrogen chloride gas in the tail gas, so that the amount of hydrogen chloride gas in the tail gas is greatly reduced.

[0027] Further, a collection and storage tank 5 is further included. The liquid tanks at the bottoms of the packed absorption towers 23 and the spray absorption tower 22, the second liquid storage tank 121, the first liquid storage tank 111 and the collection and storage tank 5 are sequentially overflow-connected, and the collection and storage tank 5 is further provided with an output pump, for facilitating the collection and transportation of the dilute hydrochloric acid liquid generated in all processes.

[0028] The neutralization unit 3 comprises a neutralization absorption tower, the gas inlet end of which is connected with the gas outlet end of the tail end packing absorption tower 23, the neutralization absorption tower uses alkaline solution to spray through a circulating pump, the hydrogen chloride gas in the tail gas contacts with the alkaline solution in gas-liquid two phases and is neutralized, so that the treated tail gas reaches the standard of environmental protection emission. The gas outlet end of the neutralization absorption tower is provided with a second air extractor 31 to prevent the tail gas from backflowing.

[0029] The above-described embodiments only express several implementation manners of the present application, the description is relatively specific and detailed, but it cannot be understood as the limitation of the scope of the present application. It should be pointed out that, for the ordinary skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and the present application also intends to include these modifications and improvements.

Claims

1. A device for capturing hydrogen chloride gas for recovering hydrochloric acid, characterized by: The application relates to a condensing unit, an absorbing unit and a neutralizing unit which are arranged in series.

2. The apparatus for recovering hydrochloric acid by trapping hydrogen chloride gas according to claim 1, wherein: The condensing unit comprises a first condensing part and a second condensing part which are arranged in series, the bottom of the first condensing part is connected with a first liquid storage tank, and the bottom of the second condensing part is connected with a second liquid storage tank.

3. The apparatus for recovering hydrochloric acid by trapping hydrogen chloride gas according to claim 2, wherein: The first condensing part comprises a plurality of condensers which are arranged in parallel, the gas inlet ends of the condensers are connected with the exhaust port, the gas outlet ends of the condensers are connected with the gas inlet end of the second condensing part, and the bottoms of the condensers are connected with the first liquid storage tank.

4. The apparatus for recovering hydrochloric acid by trapping hydrogen chloride gas according to claim 2, wherein: A plurality of pumps are further arranged, the water inlet ends of the pumps are connected with the first liquid storage tank or the second liquid storage tank, and the water outlet ends of the pumps are connected with the top of the first condensing part or the top of the second condensing part.

5. The apparatus for recovering hydrochloric acid by trapping hydrogen chloride gas according to claim 2, wherein: The absorbing unit comprises a spray absorbing tower and a plurality of packing absorbing towers which are arranged in series, the spray absorbing tower and the packing absorbing towers are sprayed with dilute hydrochloric acid liquid by circulating pumps, and the gas inlet end of the spray absorbing tower is connected with the gas outlet end of the second condensing part.

6. The apparatus for recovering hydrochloric acid by trapping hydrogen chloride gas according to claim 5, wherein: A first air extractor is arranged between the spray absorbing tower and the second condensing part.

7. The apparatus of claim 5, wherein: The liquid storage tank at the bottom of the packing absorbing tower, the liquid storage tank at the bottom of the spray absorbing tower, the second liquid storage tank and the first liquid storage tank are sequentially overflow-connected.

8. The apparatus of claim 7, wherein: A collecting and storing tank is further arranged, and the first liquid storage tank is overflow-connected with the collecting and storing tank.

9. The apparatus for recovering hydrochloric acid by trapping hydrogen chloride gas according to claim 5, wherein: The neutralizing unit comprises a neutralizing absorbing tower, the gas inlet end of the neutralizing absorbing tower is connected with the gas outlet end of the tail-end packing absorbing tower, the gas outlet end of the neutralizing absorbing tower is provided with a second air extractor, and the neutralizing absorbing tower is sprayed with alkaline solution by a circulating pump.

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