All-wet collecting and purifying system for high-temperature waste gas containing arsenic and sulfur

Abstract

The utility model provides an all-wet collecting and purifying system for high-temperature waste gas containing arsenic and sulfur, and belongs to the technical field of industrial waste gas treatment. Comprising a washing tower, a first-stage desulfurization tower, a second-stage desulfurization tower and an electric demisting unit which are connected in sequence, the top end of the washing tower is connected with the middle lower part of the first-stage desulfurization tower and is used for preliminarily degrading sulfur oxide gas, and an alkali liquor spraying device is arranged in the first-stage desulfurization tower; the top end of the first-stage desulfurization tower is connected with the middle lower part of the second-stage desulfurization tower and is used for adsorbing and degrading sulfur oxide gas, the second-stage desulfurization tower is a filler type cooling tower, and an alkali liquor spraying device is arranged in the second-stage desulfurization tower; the bottom of the electric demisting unit is connected with the secondary desulfurization tower; the device further comprises a filter press and a circulating pump; the filter press is connected with the bottom of the washing tower; an inlet of the circulating pump is connected with the bottom of the secondary desulfurization tower, and an outlet of the circulating pump is connected with a spraying device of the secondary desulfurization tower. The utility model provides a purification system capable of effectively treating tail gas containing arsenic and SOX generated by a kiln in industrial production.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial waste gas treatment, and particularly relates to a full-wet capture and purification system for high-temperature waste gas containing arsenic and sulfur. Background Art

[0002] While rapid industrialization has brought enormous economic benefits, the problem of high levels of harmful industrial waste gas emissions has become increasingly prominent. These emissions not only cause severe damage to the environment but also pose a significant threat to public health. The treatment of industrial waste gas has become a common challenge facing countries around the world. The core of waste gas treatment is to effectively manage the various harmful emissions generated by industrial production activities, including but not limited to dust particles, smoke, and toxic and hazardous chemical gases.

[0003] Arsenic-containing materials (such as arsenic-containing gold concentrate, copper concentrate, copper anode mud, etc.) will produce arsenic, SO X Flue gas contains arsenic and other heavy metal pollutants. Arsenic enters the flue gas primarily in the form of arsenic oxides (arsenic trioxide) and composite oxides with other valuable metals. If these arsenic-containing flue gases are not properly treated, they will cause significant harm to the environment and have adverse effects on human health. Therefore, strict purification treatment must be carried out before discharge to ensure compliance with national waste gas emission standards.

[0004] At present, there are two types of arsenic removal technologies for smelting flue gas: dry arsenic removal and wet arsenic removal. Dry arsenic removal technology uses cooling operation to condense arsenic trioxide in the flue gas from gas to solid state, and then enters the bag dust collector to complete gas-solid separation. Publication No. CN104451167A discloses a flue gas arsenic removal method, which uses a spray cooling tower to perform multi-stage cooling on arsenic-containing flue gas to condense arsenic in the flue gas, and then uses a bag dust collector to recover arsenic. This method mainly uses cooling water spray quenching to remove arsenic. The spray cooling tower is prone to increase the moisture content in the flue gas. After arsenic trioxide absorbs water, its viscosity increases and it will clog the bag, and water vapor will react with SO in the flue gas. X Combined to form a dilute acid corrosion device. Publication number CN108187436A discloses a method for quenching and cooling arsenic-containing flue gas using a granular medium in a circulating fluidized bed to remove arsenic. After cooling, the flue gas flows out from the top of the fluidized bed and arsenic is collected at the bottom of the fluidized bed. However, this method mainly relies on the granular medium in the fluidized bed. If the smoke concentration at the inlet is not properly controlled, it is easy to cause blockage of the system, resulting in a decrease in the flue gas flow rate and poor cooling effect, which ultimately affects the arsenic removal efficiency. In actual industrial production, the dry arsenic removal process involves the operation of bag dust collection. The number of bags on the dust collector is relatively large. If one of the bags leaks, the arsenic removal effect of the system will be greatly reduced. In addition, there is also the risk of fine particle dust-arsenic dispersion, which poses a great safety hazard to the surrounding environment.

[0005] Conventional flue gas wet arsenic removal technology generally adopts cyclone dust removal + dilute acid multi-stage washing + electrostatic mist purification to meet the subsequent flue gas acid production requirements, and the gaseous arsenic in the flue gas enters the liquid phase and is removed. Publication No. CN112370951A discloses a method for wet arsenic removal from smelting flue gas, in which the flue gas is first washed with high-concentration sulfuric acid to remove most of the sulfur trioxide; then the flue gas is washed multiple times with low-concentration sulfuric acid to remove most of the arsenic trioxide; after meeting the acid production process requirements, it is sent to the acid production system. Although the flue gas wet arsenic removal technology has the advantages of a wide range of applications, fast arsenic removal rate and high efficiency, the treatment process produces waste acid containing arsenic and heavy metals. The waste acid composition is complex and difficult to treat. In view of the problems existing in the above-mentioned arsenic-containing flue gas treatment technology, it is urgently needed to provide a flue gas wet arsenic removal method that is safe, environmentally friendly, has low production costs, and simple subsequent treatment operations. Utility Model Content

[0006] In view of this, the purpose of the present invention is to provide a fully wet capture and purification system for arsenic-containing and sulfur-containing high-temperature exhaust gas, aiming to solve at least one technical problem in the background technology.

[0007] The utility model is achieved in this way:

[0008] A fully wet capture and purification system for arsenic-containing and sulfur-containing high-temperature waste gas, the fully wet capture and purification system comprising a scrubber, a primary desulfurization tower, a secondary desulfurization tower, and an electrostatic demister unit connected in sequence; the main pollutants of the arsenic-containing and sulfur-containing high-temperature waste gas include solid smoke, arsenic oxide waste gas, and sulfur oxide gas;

[0009] The scrubber is used to settle solid dust in the high-temperature exhaust gas containing arsenic and sulfur, and to cool it down so that the gaseous arsenic oxides condense into solids;

[0010] The top of the primary desulfurization tower is connected to the middle and lower part of the primary desulfurization tower, which is used for the preliminary degradation of sulfur oxide gas. The primary desulfurization tower has a built-in alkali solution spraying device;

[0011] The top of the secondary desulfurization tower is connected to the middle and lower part of the secondary desulfurization tower, which is used to absorb and degrade sulfur oxide gas. The secondary desulfurization tower is a packed cooling tower and has a built-in alkali solution spray device;

[0012] The electrostatic demisting unit, whose bottom is connected to the secondary desulfurization tower, is used to remove residual dust and acid mist impurities;

[0013] Also includes filter press and circulation pump;

[0014] The filter press is connected to the bottom of the washing tower and is used to separate the solid-liquid mixture discharged from the washing tower;

[0015] The inlet of the circulation pump is connected to the bottom of the secondary desulfurization tower, and the outlet is connected to the spray device of the secondary desulfurization tower.

[0016] Furthermore, the washing liquid of the arsenic- and sulfur-containing high-temperature exhaust gas washing tower is in countercurrent contact.

[0017] Furthermore, the washing tower is selected from at least one of a dynamic wave washer, a spray washing tower, and a liquid column tower.

[0018] Furthermore, the electric demisting unit comprises at least two stages of electric demisters connected end to end in sequence, and the two connected electric demisters are connected by an induced draft fan; the outlet of the electric demisting unit is connected to the exhaust chimney.

[0019] Furthermore, the filter press is selected from a plate and frame filter press, a vertical filter press or a belt filter press.

[0020] Furthermore, the alkaline solution of the primary desulfurization tower and the secondary desulfurization tower is selected from sodium hydroxide solution, lime water or ammonia water.

[0021] Furthermore, the washing tower, the primary desulfurization tower and the secondary desulfurization tower all adopt an integrated tower and tank structure, and the bottom of the tower is a liquid collecting tank for collecting waste liquid.

[0022] Furthermore, the inlet of the filter press is connected to the bottom of the washing tower, and the drainage outlet is connected to the upper part of the washing tower.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The utility model provides a method for effectively treating arsenic and SO generated by furnaces in industrial production. X Exhaust gas purification system.

[0025] 2. In the process of purifying waste gas, the system of this utility model does not require substances such as acids that are highly harmful and have strict equipment requirements. It has the advantages of safety, environmental protection, low production cost, and simple subsequent treatment.

[0026] 3. The utility model effectively treats the tail gas produced by furnaces in industrial production, which mainly contains arsenic oxides, sulfur oxides and solid particles, so that it meets the emission standards and then discharges and recovers solid particles containing metals such as copper. It not only solves the problem of environmentally friendly emission of industrial tail gas, but also achieves the recycling of useful metals, ultimately achieving both environmental protection and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of the present utility model.

[0028] Illustration: 1-washing tower, 2-filter press, 3-primary desulfurization tower, 4-secondary desulfurization tower, 5-circulating pump, 6-primary electrostatic precipitator, 7-induced draft fan, 8-secondary electrostatic precipitator, 9-exhaust chimney. DETAILED DESCRIPTION

[0029] 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 in conjunction with the embodiments. It should be understood that the specific implementation cases described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] like Figure 1 As shown, a full wet capture and purification system for arsenic-containing and sulfur-containing high-temperature waste gas comprises a washing tower 1, a primary desulfurization tower 3, a secondary desulfurization tower 4 and an electrostatic demister unit connected in sequence; the main pollutants of the arsenic-containing and sulfur-containing high-temperature waste gas include solid smoke, arsenic oxide waste gas, sulfur oxide SO X Waste gas is a high-temperature exhaust gas of about 300°C produced by the furnace.

[0033] Scrubber 1 is used to settle solid dust from high-temperature, arsenic- and sulfur-containing exhaust gas and cool it to condense gaseous arsenic oxides into solids. The high-temperature, arsenic- and sulfur-containing exhaust gas is countercurrently exposed to the scrubbing liquid flowing out of the upper portion of scrubber 1. The scrubber is selected from a dynamic wave scrubber, a spray scrubber, or a liquid column scrubber. The solid dust and arsenic oxide solids produced after treatment in scrubber 1, along with the wastewater, flow into filter press 2, which is connected to the bottom of scrubber 1. Specifically, the inlet of filter press 2 is connected to the bottom of scrubber 1, and the outlet is connected to the upper portion of the scrubber. Filter press 2 separates the solid-liquid mixture discharged from the scrubber, enriching the solid particles for reuse. The solid particles discharged from the kiln contain metals such as copper, which can be recovered and reused after enrichment. The recovered liquid can be reused as scrubbing liquid. The filter press is selected from a plate and frame filter press, a vertical filter press, or a belt filter press.

[0034] The top of the primary desulfurization tower 3 is connected to the middle and lower part of the primary desulfurization tower 3. The primary desulfurization tower 3 has a built-in alkali solution spraying device. The tail gas after cooling, arsenic removal and dust removal in the scrubber 1 enters the middle and lower part of the primary desulfurization tower 3. The alkali solution is sprayed down from the upper part of the primary desulfurization tower 3. SO X It reacts with alkali solution to generate a mixed solution of sulfite and sulfate, thereby achieving preliminary degradation of sulfur oxide gas; the primary desulfurization tower 3 is an empty tower without filler.

[0035] The secondary desulfurization tower 4 is connected to the middle and lower part of the primary desulfurization tower 3. The secondary desulfurization tower is a packed cooling tower with a built-in alkali solution spraying device. The alkali solution is sprayed down from the upper part of the secondary desulfurization tower 4. The filler and structure in the secondary desulfurization tower can adopt any form of filler allowed in the art, such as ceramsite filler, metal oxide filler such as zinc oxide, silica gel filler, activated carbon filler, etc., which will not be described in detail here. The solid filler inside the secondary desulfurization tower 4 can be used to remove SO X Adsorption is carried out, and at the same time, the sprayed alkali solution and SO X The reaction further generates a mixture of sulfite and sulfate, achieving deep degradation of sulfur oxide gas.

[0036] Secondary desulfurization tower 4 is also equipped with a circulating pump 5. Its inlet is connected to the bottom of secondary desulfurization tower 4, and its outlet is connected to the tower's spray system. The circulating pump 5 circulates the mixed liquid, flushing the packing and preventing clogging. The alkaline solution in the primary and secondary desulfurization towers is selected from sodium hydroxide solution, lime water, or ammonia water.

[0037] The electrostatic demister unit, whose bottom is connected to the secondary desulfurization tower, is used to remove residual dust and acid mist impurities; the electrostatic demister unit includes at least two stages of electrostatic demisters connected end to end in sequence, and the two electrostatic demisters connected in pairs are connected by an induced draft fan 7; the outlet of the electrostatic demister unit is connected to the exhaust chimney 9. In the following embodiment, a two-stage electrostatic demister is used, namely a primary electrostatic demister 6 and a secondary electrostatic demister 8.

[0038] The washing tower 1, the primary desulfurization tower 3 and the secondary desulfurization tower 4 all adopt a tower-tank integrated structure, and the bottom of the tower is a liquid collecting tank for collecting waste liquid.

[0039] In a specific implementation, the devices also include pipes for connection, valves for controlling switches and flow, fans and pumps for driving transportation, etc., all of which adopt conventional settings and will not be elaborated here.

[0040] Example 1

[0041] The full wet capture and purification system of the utility model is used to treat high-temperature waste gas containing arsenic and sulfur. The specific steps are as follows:

[0042] (1) Arsenic-containing and sulfur-containing high-temperature exhaust gas is the tail gas generated by the furnace (about 300℃), which mainly contains harmful pollutants such as arsenic oxides, sulfur oxides and solid particles. A dynamic wave scrubber is first used to settle the solid smoke dust in the arsenic-containing and sulfur-containing high-temperature exhaust gas, and cool it down to condense the gaseous arsenic oxide into a solid; during operation, the arsenic-containing and sulfur-containing high-temperature exhaust gas is first input into the washing pipe (i.e., the reverse jet pipe) from the top, and the washing liquid (such as normal temperature water or cooling water) is reversely sprayed into the reverse jet pipe through a large-aperture non-throttling nozzle. The arsenic-containing and sulfur-containing high-temperature exhaust gas and the liquid collide with each other in reverse flow, thereby forcing the liquid to be sprayed radially from the inside to the outside toward the pipe wall, forming a strong turbulence in the gas-liquid contact area. At this time, the gas-liquid two phases reach momentum balance, and the gas-liquid phases are in close contact to generate a stable standing wave, forming a foam area. The position of the "standing wave" moves up and down with the speed of the gas and liquid. In the foam zone, the gas and liquid are in full contact, and the gas contacts the rapidly renewed liquid surface to effectively remove particles; the solid particles therein are washed, and at the same time, the tail gas is adiabatically evaporated, and the temperature drops to about 55°C. The arsenic trioxide therein condenses from the gaseous state to the solid state and is carried away with the washing liquid along with the washed solid particles. The solid-liquid separation operation is carried out by the plate and frame filter press, and the arsenic-containing solid particles are enriched and recycled;

[0043] (2) The sulfur-containing flue gas then enters the primary desulfurization tower and the secondary desulfurization tower for desulfurization. The alkaline solution used for desulfurization treatment is sodium hydroxide. In the primary desulfurization tower and the secondary desulfurization tower, the alkaline solution absorbs SO in the gas. X The discharged mother liquor is a mixture of sodium sulfite and sodium sulfate, which can be recycled or treated as sewage. In the secondary desulfurization tower, fillers are also used to remove residual SO XAdsorption is carried out and the tail gas is cooled to 40°C at the same time to form exhaust gas with a certain humidity;

[0044] (3) The exhaust gas enters the first-stage electrostatic precipitator and the second-stage electrostatic precipitator in turn to further remove residual dust, acid mist and other impurities. After the qualified exhaust gas reaches the emission index, it is discharged through the exhaust chimney (relative height of 35 meters) installed on the top of the second-stage electrostatic precipitator.

[0045] The pollutant treatment status of the arsenic- and sulfur-containing high-temperature waste gas treated in Example 1 is shown in Table 1.

[0046] Table 1. Pollutant emissions before and after treatment

[0047] Sulfur oxides solid particles arsenic oxide Before treatment <![CDATA[~6253mg / Nm 3 ]]> <![CDATA[100~250g / Nm 3 ]]> <![CDATA[~1376mg / Nm 3 ]]> After processing <![CDATA[≤50mg / Nm 3 ]]> <![CDATA[≤10mg / Nm 3 ]]> <![CDATA[≤0.5mg / Nm 3 ]]>

[0048] From the data in Table 1, we can see that after the tail gas is treated, the control index of the exhaust gas is: SO2 content ≤ 50mg / Nm 3 , solid particles ≤ 10mg / Nm 3 , SO3 content was not detected, arsenic oxide content ≤ 0.5 mg / Nm 3 This method can effectively treat arsenic and SO generated by furnaces in industrial production. X The exhaust gas can be effectively captured by the harmful pollutants such as arsenic oxides, sulfur oxides and solid particles, thus meeting environmental protection requirements.

[0049] Example 2

[0050] The full wet capture and purification system of the utility model is used to treat high-temperature waste gas containing arsenic and sulfur. The specific steps are as follows:

[0051] (1) Arsenic-containing and sulfur-containing high-temperature waste gas is the tail gas (about 300°C) generated by the furnace, which mainly contains harmful pollutants such as arsenic oxides, sulfur oxides and solid particles. The flue gas treatment system is used to treat the arsenic-containing and sulfur-containing high-temperature waste gas. In the spray tower + empty tower scrubber, the circulating pump pumps the scrubbing liquid into the spray scrubber, which contacts the tail gas in countercurrent to wash the solid particles therein. At the same time, the arsenic-containing and sulfur-containing high-temperature waste gas is adiabatically evaporated and the temperature drops to about 55°C. The arsenic trioxide therein condenses from the gaseous state to the solid state and is taken away with the scrubbing liquid together with the washed solid particles. The vertical filter press is used for solid-liquid separation. The arsenic-containing solid particles are enriched and recycled. The waste gas discharged from the scrubber is sulfur-containing flue gas;

[0052] (2) The sulfur-containing flue gas then enters the primary desulfurization tower and the secondary desulfurization tower for desulfurization. The desulfurization treatment adopts the lime-gypsum method. In the desulfurization tower, SO2 and SO3 in the flue gas react with the limestone in the slurry to form calcium sulfite and calcium sulfate. Finally, in the secondary desulfurization tower, which is the packed cooling tower, the exhaust gas is cooled to 40°C at the same time.

[0053] (3) The wet gas after desulfurization treatment enters the first-stage electrostatic precipitator and the second-stage electrostatic precipitator to further remove residual dust, acid mist and other impurities. After the qualified exhaust gas reaches the emission index, it is discharged through the exhaust chimney (relative height of 35 meters) set at the top of the second-stage electrostatic precipitator.

[0054] The pollutant treatment status of the arsenic- and sulfur-containing high-temperature waste gas treated in Example 2 is shown in Table 2.

[0055] Table 2. Pollutant emissions before and after treatment

[0056] Sulfur oxides solid particles arsenic oxide Before treatment <![CDATA[~5937mg / Nm 3 ]]> <![CDATA[120~230g / Nm 3 ]]> <![CDATA[~1435mg / Nm 3 ]]> After processing <![CDATA[≤50mg / Nm 3 ]]> <![CDATA[≤10mg / Nm 3 ]]> <![CDATA[≤0.5mg / Nm 3 ]]>

[0057] From the data in Table 2, we can see that after the tail gas is treated, the control index of the exhaust gas is: SO2 content ≤ 50mg / Nm 3 , solid particles ≤ 10mg / Nm 3 , SO3 content was not detected, arsenic oxide content ≤ 0.5 mg / Nm 3 This method can effectively treat arsenic and SO generated by furnaces in industrial production. X The exhaust gas can be effectively captured by the harmful pollutants such as arsenic oxides, sulfur oxides and solid particles, thus meeting environmental protection requirements.

[0058] Example 3

[0059] The full wet capture and purification system of the utility model is used to treat high-temperature waste gas containing arsenic and sulfur. The specific steps are as follows:

[0060] (1) Arsenic-containing and sulfur-containing high-temperature waste gas is the tail gas (about 300°C) generated by the furnace, which mainly contains harmful pollutants such as arsenic oxides, sulfur oxides and solid particles. The flue gas treatment system is used to treat the roasting tail gas. The arsenic-containing and sulfur-containing high-temperature waste gas is washed in the scrubber composed of a liquid column tower. The gas and liquid are in reverse contact to wash the solid particles therein. At the same time, the arsenic-containing and sulfur-containing high-temperature waste gas is adiabatically evaporated and the temperature is reduced to about 55°C. The arsenic trioxide therein condenses from the gaseous state to the solid state and is taken away with the washing liquid together with the washed solid particles. The solid-liquid separation operation is carried out by the belt filter press. The arsenic-containing solid particles are enriched and recycled. The waste gas discharged from the scrubber is sulfur-containing flue gas;

[0061] (2) The sulfur-containing flue gas then enters the primary desulfurization tower and the secondary desulfurization tower for desulfurization. The alkaline solution for desulfurization treatment uses ammonia water. In the desulfurization tower, SO2 and SO3 in the flue gas react with the limestone in the slurry to form ammonium sulfite, ammonium bisulfite, ammonium bisulfate and ammonium sulfate. Finally, in the secondary desulfurization tower, i.e., the packed cooling tower, the tail gas is cooled to 40°C at the same time.

[0062] (3) The wet gas after desulfurization treatment enters the first-stage electrostatic precipitator and the second-stage electrostatic precipitator to further remove residual dust, acid mist and other impurities. After the qualified exhaust gas reaches the emission index, it is discharged through the exhaust chimney (relative height of 35 meters) set at the top of the second-stage electrostatic precipitator.

[0063] The pollutant treatment status of the arsenic- and sulfur-containing high-temperature waste gas treated in Example 3 is shown in Table 3.

[0064] Table 3. Pollutant emissions before and after treatment

[0065] Sulfur oxides solid particles arsenic oxide Before treatment <![CDATA[~5683mg / Nm 3 ]]> <![CDATA[150~220g / Nm 3 ]]> <![CDATA[~1389mg / Nm 3 <!-- 5 -->]]> After processing <![CDATA[≤50mg / Nm 3 ]]> <![CDATA[≤10mg / Nm 3 ]]> <![CDATA[≤0.5mg / Nm 3 ]]>

[0066] From the data in Table 3, we can see that after the tail gas is treated, the control index of the exhaust gas is: SO2 content ≤ 50mg / Nm 3 , solid particles ≤ 10mg / Nm 3 , SO3 content was not detected, arsenic oxide content ≤ 0.5 mg / Nm 3 This method can effectively treat arsenic and SO generated by furnaces in industrial production. X The exhaust gas can be effectively captured by the harmful pollutants such as arsenic oxides, sulfur oxides and solid particles, thus meeting environmental protection requirements.

[0067] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A fully wet capture and purification system for high-temperature exhaust gas containing arsenic and sulfur, characterized in that: The full wet capture and purification system comprises a washing tower, a primary desulfurization tower, a secondary desulfurization tower and an electric demisting unit connected in sequence; The scrubber is used to settle the solid dust in the arsenic-containing and sulfur-containing high-temperature exhaust gas, and to cool the gaseous arsenic oxide in the arsenic-containing and sulfur-containing high-temperature exhaust gas to condense into solid; The top of the primary desulfurization tower is connected to the middle and lower part of the primary desulfurization tower, which is used to initially degrade the sulfur oxide gas containing arsenic and sulfur-containing high-temperature exhaust gas. The primary desulfurization tower has a built-in alkali solution spray device; The top of the secondary desulfurization tower is connected to the middle and lower part of the secondary desulfurization tower, which is used to absorb and degrade sulfur oxide gas. The secondary desulfurization tower is a packed cooling tower and has a built-in alkali solution spray device; The electrostatic demisting unit, whose bottom is connected to the secondary desulfurization tower, is used to remove residual dust and acid mist impurities; Also includes filter press and circulation pump; The filter press is connected to the bottom of the washing tower and is used to separate the solid-liquid mixture discharged from the washing tower; The inlet of the circulation pump is connected to the bottom of the secondary desulfurization tower, and the outlet is connected to the spray device of the secondary desulfurization tower.

2. The all-wet capture and purification system for high-temperature exhaust gas containing arsenic and sulfur according to claim 1 is characterized in that: The high-temperature waste gas containing arsenic and sulfur is in countercurrent contact with the washing liquid of the washing tower.

3. A fully wet capture and purification system for high-temperature exhaust gas containing arsenic and sulfur according to claim 1 or 2, characterized in that: The washing tower is selected from at least one of a dynamic wave washing tower, a spray washing tower, and a liquid column tower.

4. The all-wet capture and purification system for high-temperature exhaust gas containing arsenic and sulfur according to claim 1 is characterized in that: The electric demisting unit comprises at least two stages of electric demisters connected end to end in sequence, and the two connected electric demisters are connected by an induced draft fan; the outlet of the electric demisting unit is connected to the exhaust chimney.

5. The all-wet capture and purification system for high-temperature exhaust gas containing arsenic and sulfur according to claim 1 is characterized in that: The filter press is selected from a plate and frame filter press, a vertical filter press or a belt filter press.

6. The all-wet capture and purification system for high-temperature exhaust gas containing arsenic and sulfur according to claim 1 is characterized in that: The alkali liquor of the primary desulfurization tower and the secondary desulfurization tower is selected from sodium hydroxide solution, lime water or ammonia water.

7. The all-wet capture and purification system for high-temperature exhaust gas containing arsenic and sulfur according to claim 1 is characterized in that: The washing tower, the primary desulfurization tower and the secondary desulfurization tower all adopt a tower-tank integrated structure, and the bottom of the tower is a liquid collecting tank for collecting waste liquid.

8. The all-wet capture and purification system for high-temperature exhaust gas containing arsenic and sulfur according to claim 1 is characterized in that: The inlet of the filter press is connected to the bottom of the washing tower, and the drainage outlet is connected to the upper part of the washing tower.

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