Device for the oxidative treatment of aluminium chloride solutions containing ferrous ions

Abstract

The utility model belongs to the hydrometallurgy technical field discloses a kind of device for the oxidation treatment of aluminium chloride solution containing ferrous ion;The device for the oxidation treatment of aluminium chloride solution containing ferrous ion, including ozone generator (1), first oxidation reaction device (2), second oxidation reaction device (3), first water washing device (4), caustic washing device (5), second water washing device (6), air draught fan (7), refrigerated dryer (8), moisture absorption device (9) and gas holder (10), the device for the oxidation treatment of aluminium chloride solution containing ferrous ion in the utility model not only can efficiently oxidize ferrous ion in aluminium chloride solution containing ferrous ion, but also can recycle oxygen in tail gas, avoid oxygen resource waste, significantly reduce production cost.

Description

Technical Field

[0001] This utility model relates to the field of hydrometallurgical technology, specifically to an apparatus for the oxidation treatment of aluminum chloride solutions containing ferrous ions. Background Technology

[0002] In the process of leaching alumina from fly ash using hydrochloric acid, it is necessary to oxidize the ferrous ions in the aluminum chloride solution, thereby removing the ferrous ions through ion exchange. Ozone, as an oxidant, has attracted attention due to its strong oxidizing power and lack of impurity ions, and is widely used in water treatment, fine chemicals, and other fields.

[0003] Chinese patent document CN208700590U discloses an oxidation treatment system for organic matter and intermediate valence ions in a one-step acid leaching process for producing alumina, comprising: an oxidant storage tank for providing oxidizing gas; a liquid storage tank for providing liquid in the one-step acid leaching process for producing alumina; a water jet injector for mixing the oxidizing gas with at least a portion of the liquid to form a gas-liquid mixture; an oxidation tank for reacting the liquid and oxidizing gas to obtain oxidized liquid and tail gas; a radial flow aerator for uniformly mixing the oxidizing gas and liquid in the gas-liquid mixture; and a tail gas treatment device for removing... The exhaust gas discharged from the oxidation tank carries acidic gases and moisture; an induced draft device is used to introduce the treated exhaust gas into the alumina roasting furnace; this system can shorten the oxidation time required to oxidize intermediate valence ions in aluminum chloride solution to the same degree; it also improves the utilization rate of oxidant and saves costs; using ozone as an oxidant in the fly ash acid process for alumina production can convert ferrous ions in aluminum chloride solution into ferric ions, and the oxidized exhaust gas is then decomposed by electric heating for environmentally friendly emission, but this process has the problems of low oxidation efficiency, high power consumption for exhaust gas environmental treatment, and waste of oxygen; Chinese patent document CN207142843U discloses Fe for use in the "one-step acid dissolution method" for producing alumina. 2+ The oxidation system includes: an ozone unit for providing ozone; a storage tank for providing aluminum chloride solution; and an oxidation tank for using ozone to remove Fe from the aluminum chloride solution. 2+ Oxidized to Fe 3+ The upper part of the oxidation tank is equipped with an exhaust gas outlet for waste gas discharge and an outlet for oxidized feed liquid discharge. The lower part of the oxidation tank also has a circulating feed inlet for feeding the oxidized feed liquid discharged from the outlet into the oxidation tank for circulating oxidation until it meets the required standards. An oxidized feed liquid storage tank is used to receive the qualified oxidized feed liquid from the oxidation tank. An acid absorption unit is used to remove acidic gases from the waste gas from the oxidation tank; the acid absorption unit includes a water washing device and an alkaline washing device. A tail gas destroyer is used to receive the waste gas from the acid absorption unit and decompose the ozone in it before discharging it. This system can use ozone as an oxidant to decompose Fe in the "one-step acid dissolution method" for producing alumina.2+ Oxidation is highly efficient. However, the mixed gas after the oxidation reaction only undergoes simple treatment and cannot be reused. It must be directly sent to an ozone decomposer for high-temperature decomposition to meet environmental protection requirements. Utility Model Content

[0004] The technical problem this invention aims to solve is that the oxidation of aluminum chloride solutions containing ferrous ions in the prior art suffers from low oxidation efficiency, high power consumption for exhaust gas treatment, and waste of oxygen. This invention provides a device for oxidizing aluminum chloride solutions containing ferrous ions, which can achieve efficient oxidation of the solution, fully purify the oxidized gas, and recycle the exhaust gas to meet the reuse standards of ozone generators. This achieves low energy consumption, zero emissions, and clean production in the oxidation process, while also conserving oxygen resources.

[0005] To solve the above-mentioned technical problems, this utility model provides an apparatus for oxidizing aluminum chloride solution containing ferrous ions, including an ozone generator, a first oxidation reaction device, a second oxidation reaction device, an exhaust gas purification device, an exhaust gas drying device, and an exhaust gas storage tank. The ozone generator is equipped with an oxygen inlet and an ozone gas outlet. The ozone gas outlet of the ozone generator is connected to the ozone gas inlets of the first oxidation reaction device and the second oxidation reaction device via pipelines. The gas outlets of the first oxidation reaction device and the second oxidation reaction device are connected to the gas inlet of the exhaust gas purification device via pipelines. The gas outlet of the exhaust gas purification device is connected to the gas inlet of the exhaust gas drying device via pipelines. The gas outlet of the exhaust gas drying device is connected to the gas inlet of the gas storage tank via pipelines. The gas outlet of the gas storage tank is connected to the oxygen inlet of the ozone generator via pipelines. The first oxidation reaction device is provided with a first liquid inlet and a first liquid outlet, and the second oxidation reaction device is provided with an acid inlet, a second liquid inlet and a second liquid outlet; the first liquid inlet of the first oxidation reaction device is configured to be connected to a storage tank of aluminum chloride solution containing ferrous ions, the first liquid outlet of the first oxidation reaction device is connected to the second liquid inlet of the second oxidation reaction device, the acid inlet is configured to supply acid to the second oxidation reaction device, and the second liquid outlet of the second oxidation reaction device is configured to discharge the oxidized aluminum chloride solution.

[0006] According to some embodiments of the present invention, the exhaust gas purification device includes a first water washing device, an alkaline washing device, and a second water washing device. The gas outlets of the first oxidation reaction device and the second oxidation reaction device are respectively connected to the gas inlet of the first water washing device through pipelines; the gas outlet of the first water washing device is connected to the gas inlet of the alkaline washing device through pipelines; the gas outlet of the alkaline washing device is connected to the gas inlet of the second water washing device (6) through pipelines; and the gas outlet of the second water washing device is connected to the gas inlet of the tail gas drying device through pipelines.

[0007] According to some embodiments of the present invention, the first water washing device includes a first water inlet, which is configured to supply water to the first water washing device.

[0008] According to some embodiments of the present invention, the second water washing device includes a second water inlet, which is configured to supply water to the second water washing device.

[0009] According to some embodiments of the present invention, the alkaline washing device includes an alkaline inlet, which is configured to supply alkaline solution to the alkaline washing device.

[0010] According to some embodiments of this utility model, the alkaline solution is a sodium hydroxide solution.

[0011] According to some embodiments of this utility model, the exhaust gas drying device includes a refrigerated dryer and a moisture absorption device; The gas outlet of the exhaust gas purification device is connected to the gas inlet of the refrigerated dryer via a pipeline; the gas outlet of the refrigerated dryer is connected to the gas inlet of the moisture absorption device via a pipeline; and the gas outlet of the moisture absorption device is connected to the gas inlet of the gas storage tank via a pipeline.

[0012] According to some embodiments of the present invention, the refrigerated dryer is provided with a condensate outlet, which is used to discharge condensate.

[0013] According to some embodiments of the present invention, the device further includes an induced draft fan; The gas outlet of the exhaust gas purification device is connected to the gas inlet of the induced draft fan via a pipeline, and the gas outlet of the induced draft fan is connected to the gas inlet of the exhaust gas drying device via a pipeline.

[0014] According to some embodiments of this utility model, the acid solution is nitric acid.

[0015] In this invention, there are no particular limitations on the selection of the ozone generator, the first oxidation reaction device, the second oxidation reaction device, the first water washing device, the second water washing device, the alkaline washing device, the refrigerated dryer, and the moisture absorption device. All of these are conventional devices that can be known to those skilled in the art. For example, the first oxidation reaction device and the second oxidation reaction device can be an aeration tank or a reaction vessel with a height of 8-10 meters; the first water washing device and the second water washing device can be a water washing tower; the alkaline washing device can be an alkaline washing tower; the refrigerated dryer can be a refrigerated air dryer; and the moisture absorption device can be an adsorption dryer.

[0016] In this invention, there are no special limitations on the selection of the induced draft fan; all are conventional induced draft fan devices that are known to those skilled in the art.

[0017] In this invention, there are no particular limitations on the selection of storage tanks; all are conventional storage tank equipment that can be known to those skilled in the art. For example, storage tanks made of polypropylene (PP), polyvinyl chloride (CPVC), or polytetrafluoroethylene (PTFE) can be used in this invention.

[0018] In this invention, the process of ozone oxidation of ferrous ions in aluminum chloride solution has the following characteristics: when the concentration of ferrous ions is high, the oxidation efficiency of ozone is very high; however, when the concentration of ferrous ions in the solution drops to a certain threshold (<0.1 g / L), the ozone oxidation efficiency will decrease significantly, requiring a large amount of ozone to continue the reaction. To address this problem, this invention adds a second oxidation reaction device, namely, adding nitric acid after the concentration of ferrous ions in the aluminum chloride solution drops to this threshold. The remaining ferrous ions are further completely oxidized by the nitric acid, thereby effectively improving the utilization efficiency of ozone.

[0019] According to some embodiments of the present invention, the ozone generator is used to prepare ozone gas using fresh oxygen and oxygen from the drying and dehydration unit, and to deliver the ozone gas to the oxidation unit.

[0020] According to some embodiments of the present invention, the first oxidation reaction device is used to oxidize part of the ferrous ions in the aluminum chloride solution containing ferrous ions using ozone; the second oxidation reaction device is used to oxidize the remaining ferrous ions in the aluminum chloride solution containing ferrous ions using ozone and nitric acid, and the exhaust gas from the first oxidation reaction device and the second oxidation reaction device is sent to the exhaust gas purification unit.

[0021] According to some embodiments of this utility model, the first water washing device is used to remove the oxidized aluminum chloride solution entrained in the exhaust gas; the alkaline washing device is used to remove acidic gases from the exhaust gas; and the second water washing device is used to remove the alkaline solution entrained in the exhaust gas and transport the purified exhaust gas to the drying and dehydration unit.

[0022] Because ozone gas may produce volatile HCl gas during the reaction with aluminum chloride solution containing ferrous ions in an acidic environment, the exhaust gas will contain HCl gas.

[0023] In this invention, the oxidized aluminum chloride solution entrained in the exhaust gas is removed by dissolving in water in the first water washing device; the acidic gas in the exhaust gas is hydrogen chloride (HCl), which is removed by neutralization reaction with alkali (sodium hydroxide) in the alkaline washing device; after passing through the alkaline washing device, the alkali (sodium hydroxide) solution entrained in the exhaust gas is removed by dissolving in water.

[0024] According to some embodiments of this utility model, the freeze dryer is used to remove moisture from the exhaust gas; the moisture absorption device is used to remove moisture from the exhaust gas and transport the dried and dehydrated exhaust gas (mainly composed of oxygen) to the ozone generating unit to realize the recovery and utilization of oxygen in the exhaust gas.

[0025] In this invention, the purified exhaust gas is cooled to remove most of the water by a refrigerated dryer, and the purified exhaust gas is further dried to a dew point below -50°C by a moisture absorption device to meet the gas requirements of the ozone generator. The gas then enters the gas storage tank.

[0026] Beneficial effects: The device for oxidizing aluminum chloride solution containing ferrous ions provided by this utility model has the following specific process for oxidation of aluminum chloride solution containing ferrous ions and recovery of tail gas: The aluminum chloride solution containing ferrous ions is first oxidized by ozone gas in the first oxidation reaction device, and then oxidized a second time by a mixture of ozone and nitric acid in the second oxidation reaction device, so that all the ferrous ions in the aluminum chloride solution containing ferrous ions are converted into ferric ions; The resulting tail gas is purified by first water washing, alkaline washing, and second water washing to remove the entrained liquid (oxidized aluminum chloride solution) and HCl gas components in the tail gas; Finally, the tail gas is dehydrated by a refrigerated dryer and a moisture absorption device (adsorption drying), and the dehydrated and dried tail gas is returned to the ozone generator for recycling.

[0027] The device described in this invention can not only efficiently oxidize ferrous ions in aluminum chloride solutions containing ferrous ions, but also recover and utilize oxygen in the exhaust gas, avoiding waste of oxygen resources and significantly reducing production costs. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the apparatus for oxidizing aluminum chloride solution containing ferrous ions as described in this utility model.

[0029] In the diagram, 1-ozone generator, 2-first oxidation reaction device, 3-second oxidation reaction device, 4-first water washing device, 5-alkaline washing device, 6-second water washing device, 7-exhaust fan, 8-refrigerated dryer, 9-moisture absorption device, 10-gas storage tank. Detailed Implementation

[0030] The present invention will be further described below with reference to the embodiments. However, the present invention is not limited to these embodiments.

[0031] Unless otherwise specified, all raw materials and components used in the following embodiments and comparative examples of this utility model are commercially available.

[0032] In this embodiment of the utility model, the ozone generator was purchased from Qingdao Guolin Technology Group Co., Ltd., with an ozone generation capacity of 10 kg / hour and model CF-G-2-10Kg. The first oxidation reaction device and the second oxidation reaction device are the same, both are steel-lined polytetrafluoroethylene reactors, purchased from Binzhou Tanglian Chemical Machinery Co., Ltd., atmospheric pressure equipment, specifications: diameter 2m, height 8m; The first and second water washing devices are the same, both being water washing packed towers purchased from Hebei Huaqiang Technology Development Co., Ltd., with the following specifications: the tower body is made of fiberglass, with a diameter of 1m and a height of 6m, and fiberglass packing. The alkaline washing device is an alkaline washing packed tower, purchased from Hebei Huaqiang Technology Development Co., Ltd. Specifications: tower body made of fiberglass, diameter 1m, height 6m, fiberglass packing. The induced draft fan was purchased from Dezhou Fulet Environmental Protection Technology Co., Ltd., model 2.8A, with the following specifications: speed 2900rpm, flow rate 1131m3 / h, and pressure 900Pa. The freeze dryer was purchased from Hangzhou Shunfeng Purification Equipment Co., Ltd., with a capacity of 55 cubic meters of gas per hour.

[0033] The moisture absorption device is a 50 cubic meter adsorption dryer, purchased from Qingdao Guolin Technology Group Co., Ltd., GFN50-PA, with an outlet gas dew point ≤-50℃; The gas storage tank was purchased from Beijing Ouliyuan Machinery Co., Ltd., with a volume of 40 cubic meters and a pressure of 0.8 bar.

[0034] Example 1 This embodiment provides an apparatus for the oxidation treatment of aluminum chloride solutions containing ferrous ions. The apparatus for oxidizing aluminum chloride solution containing ferrous ions and recovering tail gas includes an ozone generator 1, a first oxidation reaction device 2, a second oxidation reaction device 3, a first water washing device 4, an alkaline washing device 5, a second water washing device 6, an induced draft fan 7, a refrigerated dryer 8, a moisture absorption device 9, and a gas storage tank 10.

[0035] The ozone generator 1 includes a first oxygen inlet, a second oxygen inlet, and an ozone gas outlet. A fresh oxygen storage tank is connected to the first oxygen inlet of the ozone generator 1 via a pipeline. The ozone gas outlet of the ozone generator 1 is connected to the ozone gas inlets of the first oxidation reaction device 2 and the second oxidation reaction device 3 via pipelines. The gas outlets of the first oxidation reaction device 2 and the second oxidation reaction device 3 are connected to the gas inlet of the first water washing device 4 via pipelines. The gas outlet of the first water washing device 2 is connected to the gas inlet of the alkaline washing device 5 via a pipeline. The gas outlet of the alkaline washing device 5 is connected to the gas inlet of the second water washing device 6 via a pipeline; the gas outlet of the second water washing device 6 is connected to the gas inlet of the induced draft fan 7 via a pipeline; the gas outlet of the induced draft fan 7 is connected to the gas inlet of the refrigerated dryer 8 via a pipeline; the gas outlet of the refrigerated dryer 8 is connected to the gas inlet of the moisture absorption device 9 via a pipeline; the gas outlet of the moisture absorption device 9 is connected to the gas inlet of the gas storage tank 10 via a pipeline; and the gas outlet of the gas storage tank 10 is connected to the second oxygen inlet of the ozone generator 1 via a pipeline.

[0036] The first oxidation reaction device 2 includes a first liquid inlet and a first liquid outlet, and the second oxidation reaction device 3 includes a second liquid inlet, an acid inlet, and a second liquid outlet. The first liquid inlet of the first oxidation reaction device 2 is configured to be connected to a storage tank containing an aluminum chloride solution containing ferrous ions. The first liquid outlet of the first oxidation reaction device 2 is connected to the second liquid inlet of the second oxidation reaction device 3. The acid inlet is configured to supply acid to the second oxidation reaction device 3, and the second liquid outlet of the second oxidation reaction device 3 is configured to discharge the oxidized aluminum chloride solution.

[0037] The first water washing device 4 includes a first water inlet, which is configured to provide water to the first water washing device 4; the second water washing device 6 includes a second water inlet, which is configured to provide water to the second water washing device 6; the alkaline washing device 5 includes an alkaline solution inlet, which is configured to provide alkaline solution to the alkaline washing device 5; the refrigerated dryer 8 is provided with a condensate outlet, which is used to discharge condensate.

[0038] The ozone generator is used to prepare ozone gas using fresh oxygen and oxygen from the drying and dehydration unit, and to deliver the ozone gas to the oxidation unit. The first oxidation reaction device is used to oxidize some of the ferrous ions in the aluminum chloride solution containing ferrous ions using ozone; the second oxidation reaction device is used to oxidize the remaining ferrous ions in the aluminum chloride solution containing ferrous ions using ozone and nitric acid, and the exhaust gas from the first oxidation reaction device and the second oxidation reaction device is sent to the exhaust gas purification unit. The first water washing device is used to remove the oxidized aluminum chloride solution entrained in the exhaust gas; the alkaline washing device is used to remove the acidic gas in the exhaust gas; the second water washing device is used to remove the alkaline solution entrained in the exhaust gas and transport the purified exhaust gas to the drying and dehydration unit. The refrigerated dryer is used to remove moisture from the exhaust gas; the moisture absorption device is used to remove moisture from the exhaust gas and transport the dried and dehydrated exhaust gas (mainly composed of oxygen) to the ozone generating unit to realize the recovery and utilization of oxygen in the exhaust gas.

[0039] The apparatus for oxidizing aluminum chloride solution containing ferrous ions described in this utility model includes an ozone generation unit, an oxidation unit, a tail gas purification unit, and a drying and dehydration unit. The specific process is as follows: (1) Ozone generating unit Fresh oxygen (O2 mass concentration 90%, dew point ≤ -60℃ at 1 atmosphere) and oxygen returned from the drying and dehydration unit enter ozone generator 1 together to produce ozone gas (O3 mass concentration 8%, O2 mass concentration 92%), which is then sent to the oxidation unit.

[0040] (2) Oxidation unit Ozone gas and an aluminum chloride solution containing ferrous ions (ferrous ion concentration of 1.0 g / L) at a temperature of 60℃~80℃ are introduced into the first oxidation reaction device 2. The gas phase and liquid phase are fully contacted, and the ferrous ions react with ozone. After the first oxidation, the ferrous ion concentration in the aluminum chloride solution is reduced to 0.2 g / L. Further, the aluminum chloride solution after the first oxidation (80℃), ozone gas, and a nitric acid solution with a volume concentration of 40% are introduced into the second oxidation reaction device 3. The ozone and nitric acid mixture produces a synergistic oxidation enhancement effect, converting all the ferrous ions in the aluminum chloride solution after the first oxidation into ferric ions, resulting in an oxidized aluminum chloride solution (ferrous ion concentration below the detection limit). The exhaust gases generated in the first oxidation reaction device 2 and the second oxidation reaction device 3 are sent together to the exhaust gas purification unit.

[0041] (3) Exhaust gas purification unit The exhaust gas generated by the oxidation unit enters the first water washing device 4, where the oxidized aluminum chloride solution entrained in the exhaust gas dissolves in the water, removing the oxidized aluminum chloride solution. Further, the exhaust gas enters the alkaline washing device 5, where the alkaline solution (sodium hydroxide solution) has a mass concentration of 10%. The HCl component in the exhaust gas undergoes a neutralization reaction with the alkaline solution (sodium hydroxide), removing the HCl component. Further, the exhaust gas enters the second water washing device 6, where the alkaline solution (sodium hydroxide solution) entrained in the exhaust gas dissolves in the water, removing the alkaline solution (sodium hydroxide solution), resulting in purified exhaust gas, which is then sent to the drying and dehydration unit.

[0042] (4) Drying and dehydration unit The purified exhaust gas is sent to the freeze dryer 8 by the induced draft fan 7. Most of the water in the exhaust gas is cooled into condensate, and the exhaust gas is cooled to a dew point of 2°C. Further, the exhaust gas enters the moisture absorption device 9, where the moisture is absorbed, the oxygen concentration in the gas phase reaches 90%, and the dew point reaches -50°C, meeting the gas requirements of the ozone generator. The gas is then sent to the gas storage tank 10 to obtain dried and dehydrated oxygen. The dried and dehydrated oxygen is then sent to the ozone generation unit to realize the recovery and utilization of oxygen in the exhaust gas.

[0043] It should be noted that the embodiments described above are only for explaining the present invention and do not constitute any limitation on the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory terms, not limiting terms. Modifications can be made to the present invention within the scope of the claims, and revisions can be made to the present invention without departing from the scope and spirit of the present invention. Although the present invention described herein relates to specific methods, materials, and embodiments, it does not mean that the present invention is limited to the specific examples disclosed herein; on the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. An apparatus for the oxidation treatment of aluminum chloride solutions containing ferrous ions, characterized in that, It includes an ozone generator (1), a first oxidation reaction device (2), a second oxidation reaction device (3), an exhaust gas purification device, an exhaust gas drying device, and an air storage tank (10). The ozone generator (1) is provided with an oxygen inlet and an ozone gas outlet. The ozone gas outlet of the ozone generator (1) is connected to the ozone gas inlets of the first oxidation reaction device (2) and the second oxidation reaction device (3) through pipelines. The gas outlets of the first oxidation reaction device (2) and the second oxidation reaction device (3) are connected to the gas inlets of the exhaust gas purification device through pipelines. The gas outlet of the exhaust gas purification device is connected to the gas inlet of the exhaust gas drying device through pipelines. The gas outlet of the exhaust gas drying device is connected to the gas inlet of the gas storage tank (10) through pipelines. The gas outlet of the gas storage tank (10) is connected to the oxygen inlet of the ozone generator (1) through pipelines. The first oxidation reaction device (2) is provided with a first liquid inlet and a first liquid outlet, and the second oxidation reaction device (3) is provided with an acid inlet, a second liquid inlet and a second liquid outlet; the first liquid inlet of the first oxidation reaction device (2) is configured to be connected to a storage tank of aluminum chloride solution containing ferrous ions, the first liquid outlet of the first oxidation reaction device (2) is connected to the second liquid inlet of the second oxidation reaction device (3), the acid inlet is configured to provide acid to the second oxidation reaction device (3), and the second liquid outlet of the second oxidation reaction device (3) is configured to discharge the oxidized aluminum chloride solution.

2. The apparatus according to claim 1, characterized in that, The exhaust gas purification device includes a first water washing device (4) and an alkaline washing device (5). The gas outlet of the first oxidation reaction device (2) and the gas outlet of the second oxidation reaction device (3) are respectively connected to the gas inlet of the first water washing device (4) through pipelines; the gas outlet of the first water washing device (4) is connected to the gas inlet of the alkaline washing device (5) through pipelines; the gas outlet of the alkaline washing device (5) is connected to the gas inlet of the tail gas drying device through pipelines.

3. The apparatus of claim 2, wherein, The exhaust gas purification device also includes a second water washing device (6). The gas outlet of the alkaline washing device (5) is connected to the gas inlet of the second water washing device (6) via a pipeline; the gas outlet of the second water washing device (6) is connected to the gas inlet of the tail gas drying device via a pipeline.

4. The apparatus of claim 2, wherein, The first water washing device (4) includes a first water inlet, which is configured to supply water to the first water washing device (4).

5. The apparatus of claim 3, wherein, The second water washing device (6) includes a second water inlet, which is configured to supply water to the second water washing device (6).

6. The apparatus according to claim 2, characterized in that, The alkaline washing device (5) includes an alkaline inlet, which is configured to supply alkaline solution to the alkaline washing device (5).

7. The apparatus of claim 1, wherein, The exhaust gas drying device includes a refrigerated dryer (8); The gas outlet of the exhaust gas purification device is connected to the gas inlet of the refrigerated dryer (8) via a pipeline; the gas outlet of the refrigerated dryer (8) is connected to the gas inlet of the gas storage tank (10) via a pipeline.

8. The apparatus of claim 7, wherein, The exhaust gas drying device also includes a moisture absorption device (9). The gas outlet of the refrigerated dryer (8) is connected to the gas inlet of the moisture absorption device (9) via a pipeline; the gas outlet of the moisture absorption device (9) is connected to the gas inlet of the gas storage tank (10) via a pipeline.

9. The apparatus of claim 8, wherein, The refrigerated dryer (8) is provided with a condensate outlet, which is used to discharge condensate.

10. The apparatus of claim 1, wherein, The device also includes an induced draft fan (7). The gas outlet of the exhaust gas purification device is connected to the gas inlet of the induced draft fan (7) via a pipeline, and the gas outlet of the induced draft fan (7) is connected to the gas inlet of the exhaust gas drying device via a pipeline.

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