Device for preparing acid by desulfurizing waste gas containing low-concentration sulfur

Abstract

The utility model discloses a device for preparing acid by desulfurizing waste gas containing low-concentration sulfur. The device comprises an ejector, a desulfurizing tower, a turbulent demister, an electrostatic demisting device and an exhaust funnel, wherein the lower part of the desulfurizing tower is communicated with the ejector; the turbulent demister is communicated with the top of the desulfurizing tower; according to the system, no secondary pollutants are generated, a dilute sulfuric acid product is produced in the waste gas desulfurization process, and the ultra-low emission requirements that the content of sulfur dioxide in waste gas pollutants is lower than 50mg / m < 3 > and the content of sulfuric acid mist in the waste gas pollutants is lower than 5mg / m < 3 > are stably met; meanwhile, the cost of the whole waste gas desulfurization device is reduced and the operation stability of the desulfurization device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection tail gas treatment, in particular to a device for desulfurizing and producing acid from waste gas containing low-concentration sulfur. Background Art

[0002] Many product lines of chemical and metallurgical enterprises will produce some sulfur-containing waste gas. If it is discharged directly, it will not meet the relevant national pollutant emission standards. It must be treated with necessary technologies to meet the requirements. For example, the sulfur dioxide pollutant index in the "Air Pollutant Emission Standard" has been increased from 960mg / m 3 At the same time, some places have implemented ultra-low emission standards, requiring sulfur dioxide pollutants to be less than 50mg / m 3 At present, most of the methods adopt the method of adding alkaline substances such as limestone, ammonia water, sodium hydroxide, etc. to neutralize the sulfur dioxide in the waste gas. After the treatment, a large amount of secondary pollutants such as waste residue and wastewater will be generated. For example, a large amount of gypsum waste residue can only be stored as solid waste, which brings risks to the environment of the storage site. For example, a large amount of sodium sulfate waste liquid is generated, and some enterprises directly discharge it nearby, causing risks to the water environment. Some enterprises evaporate the waste liquid to obtain sodium sulfate salt, which increases the treatment cost on the one hand, and the storage of sodium sulfate salt is still a problem on the other hand. Utility Model Content

[0003] In order to solve the above problems of the prior art, the utility model provides a device for desulfurizing and producing acid from waste gas containing low-concentration sulfur.

[0004] The technical solution adopted by the utility model is:

[0005] The utility model provides a device for desulfurizing and producing acid by waste gas containing low concentration of sulfur, comprising an ejector, a desulfurizing tower connected to the ejector at the bottom, a turbulent demister connected to the top of the desulfurizing tower, an electrostatic demister connected to the turbulent demister, and an exhaust pipe connected to the electrostatic demister; the desulfurizing tower is connected to a hydrogen peroxide tank through a hydrogen peroxide feeding pump, and the sulfur-containing waste gas is introduced into the ejector inlet.

[0006] Furthermore, the bottom of the desulfurization tower is connected to the inlet of a desulfurization circulation pump, and the outlet of the desulfurization circulation pump is connected to the outlet of a hydrogen peroxide feeding pump.

[0007] Furthermore, the outlet of the desulfurization circulation pump is also connected to the inlet of the ejector, and the solution is input into the ejector to cool the exhaust gas.

[0008] Furthermore, the outlet of the desulfurization circulation pump is also connected to the dilute sulfuric acid tank, and a valve is provided between the outlet of the desulfurization circulation pump and the dilute sulfuric acid tank.

[0009] Furthermore, the dilute sulfuric acid tank is connected to the inlet of the dilute sulfuric acid delivery pump, and the outlet of the dilute sulfuric acid delivery pump is communicated with the boundary area.

[0010] Furthermore, the lower part of the electrostatic demisting device is connected to the inlet of the turbulator circulation pump, and the outlet of the turbulator circulation pump is connected to the upper part of the turbulent demister, so that the process gas with mist from the desulfurization tower is washed again by the turbulator circulation pump.

[0011] Furthermore, the outlet of the turbulator circulation pump is also connected to the desulfurization tower to utilize the excess solution.

[0012] Furthermore, the ejector and desulfurization tower adopt glass fiber reinforced plastic shells, the hydrogen peroxide tank adopts stainless steel shells, and the electrostatic demisting device adopts conductive glass fiber reinforced plastic shells.

[0013] Furthermore, the injector contains a fluorine material lining which is resistant to high temperature and strong corrosion.

[0014] Furthermore, the desulfurization tower comprises a desulfurization tower stabilizing layer, and the desulfurization tower stabilizing layer structure contains one or more packing layers, the packing layer thickness is 1500-6000mm, and the packing specification is 40-80mm.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model does not generate any secondary pollutants, and produces dilute sulfuric acid products during the waste gas desulfurization process, which can stably achieve waste gas pollutant sulfur dioxide below 50mg / m 3 , sulfuric acid mist is less than 5mg / m 3 It can also meet the ultra-low emission requirements of the exhaust gas desulfurization device, while reducing the cost of the entire exhaust gas desulfurization device and improving the operational stability of the desulfurization device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of a device for desulfurizing and producing sulfuric acid from waste gas containing low concentration sulfur;

[0018] Figure 2 It is a schematic diagram of the desulfurization tower structure of a device for desulfurizing and producing acid from waste gas containing low concentration sulfur;

[0019] Figure 3 The figure is a schematic diagram of the structure of a dilute sulfuric acid tank of a device for desulfurizing and producing acid from waste gas containing low concentration sulfur.

[0020] In the figure: 1- ejector; 2- desulfurization tower; 3- turbulent demister; 4- electrostatic demister; 5- dilute sulfuric acid tank; 6- hydrogen peroxide tank; 7- desulfurization tower steady flow layer; 8- desulfurization circulation pump; 9- turbulent device circulation pump; 10- hydrogen peroxide feed pump; 11- dilute sulfuric acid delivery pump; 12- exhaust pipe. DETAILED DESCRIPTION

[0021] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through a specific implementation method and in combination with its drawings. In the following description, many specific details are described to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein, so the scope of protection of the present application is not limited by the specific embodiments disclosed below. In addition, in the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly specified and specifically defined. In this application, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection, an electrical connection, or a communication; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In this application, unless otherwise clearly specified and defined, the first feature "on" or "under" the second feature can be the first and second features directly contacting, or the first and second features indirectly contacting through an intermediate medium. In the description of this specification, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0022] Example 1

[0023] See also Figures 1 to 3The utility model provides an embodiment: a device for desulfurizing and producing acid from waste gas containing low concentration sulfur, comprising an ejector 1, a desulfurization tower 2, a turbulent demister 3, an electrostatic demister, an exhaust pipe 12, a hydrogen peroxide feeding pump 10, and a hydrogen peroxide tank 6.

[0024] The injector 1 contains a fluorine material lining that is resistant to high temperatures and strong corrosion. The exhaust gas from outside the boundary area is cooled and partially desulfurized inside the injector 1.

[0025] The lower part of the desulfurization tower 2 is connected to the ejector 1 through a pipeline. The desulfurization tower 2 includes a desulfurization tower stabilizing layer 7. The structure of the desulfurization tower stabilizing layer 7 includes one or more packing layers. The packing layer thickness is 1500-6000mm, and the packing specification is 40-80mm. There is a dilute sulfuric acid solution inside the desulfurization tower stabilizing layer 7. The sulfur-containing exhaust gas cooled from the ejector 1 enters the lower part of the desulfurization tower 2, passes through the desulfurization tower stabilizing layer 7 from bottom to top to the top of the desulfurization tower 2 in sequence, and a desulfurization and acid-making reaction occurs inside the desulfurization tower 2 to remove the sulfur-containing components in the exhaust gas.

[0026] The desulfurization tower 2 is connected to the hydrogen peroxide tank 6 through a hydrogen peroxide feeding pump 10, and the hydrogen peroxide from the hydrogen peroxide tank 6 is mixed with the dilute sulfuric acid solution of the desulfurization tower 2 through the hydrogen peroxide pump and input into the upper part of the desulfurization tower 2 (the desulfurization tower steady flow layer 7).

[0027] The turbulent demister 3 is connected to the top of the desulfurization tower 2 through a pipeline, and the process gas from the top of the desulfurization tower 2 enters the turbulent demister 3 to remove the dilute sulfuric acid foam entrained from the desulfurization tower 2 in the process gas.

[0028] The electrostatic demisting device is connected to the turbulent demister 3 through a pipeline, and the process gas from the turbulent demister 3 enters the electrostatic demisting device 4 to remove sulfuric acid droplets in the process.

[0029] The exhaust chimney 12 is connected to the electrostatic demisting device through a pipeline. The clean gas from the electrostatic demisting device, from which sulfur dioxide and sulfuric acid mist have been removed, meets the ultra-low emission requirements of pollutants, and is discharged at a high point through the exhaust chimney 12.

[0030] The ejector 1 and the desulfurization tower 2 are made of glass fiber reinforced plastics, the hydrogen peroxide tank 6 is made of stainless steel, and the electrostatic demisting device is made of conductive glass fiber reinforced plastics.

[0031] Working principle:

[0032] 1. The sulfur-containing waste gas from the boundary area undergoes rapid cooling and preliminary desulfurization and acid production in the ejector 1, so that the sulfur-containing waste gas exceeding 100℃~1100℃ is cooled to about 50℃ under the action of the solution entering the ejector 1.

[0033] 2. The cooled sulfur-containing waste gas is in reverse contact with the desulfurization circulating liquid mixed with hydrogen peroxide in the desulfurization tower 2, and a desulfurization and acid production chemical reaction occurs. The sulfur dioxide in the sulfur-containing waste gas reacts with the hydrogen peroxide in the desulfurization circulating liquid to produce SO 2 +H 2 O 2 =H 2 SO 4 At the same time, the hydrogen peroxide feeding pump 10 automatically controls the addition of hydrogen peroxide to reduce the sulfur dioxide concentration in the exhaust gas to 50 mg / m 3 the following.

[0034] 3. The gas after desulfurization carries dilute sulfuric acid droplets. In the turbulent demister 3, the gas-liquid turbulent zone with strong contact formed by the air flow and liquid in the turbulent demister 3 can remove the dilute sulfuric acid droplets carried in the gas with maximum efficiency.

[0035] 4. The gas after the dilute sulfuric acid droplets are removed enters the electrostatic demisting device 4. The electrostatic demisting device 4 is a device that uses the principle of DC high-voltage electric field to discharge electrons through the electric field cathode line to the electric field. The electrons attach to the droplets of the electric field process gas, making the electric field droplets negatively charged. Under the action of the electric field force, the negatively charged droplets approach the anode and are finally adsorbed to the anode tube wall of the electrostatic demisting device. Controlling the electric field voltage of the electrostatic demisting device 4 to be above 70kV can reduce the sulfuric acid droplets in the exhaust gas to the ultra-low emission requirement of 5mg / m 3 the following.

[0036] Example 2

[0037] See also Figures 1 to 3 The utility model provides an embodiment: a device for desulfurizing and producing acid from waste gas containing low concentration sulfur, comprising an ejector 1, a desulfurization tower 2, a turbulent demister 3, an electrostatic demister, an exhaust pipe 12, a hydrogen peroxide feeding pump 10, and a hydrogen peroxide tank 6.

[0038] The injector 1 contains a fluorine material lining that is resistant to high temperatures and strong corrosion. The exhaust gas from outside the boundary area is cooled and partially desulfurized inside the injector 1.

[0039] The lower part of the desulfurization tower 2 is connected to the ejector 1 through a pipeline. The desulfurization tower 2 includes a desulfurization tower stabilizing layer 7. The structure of the desulfurization tower stabilizing layer 7 includes one or more packing layers. The packing layer thickness is 1500-6000mm, and the packing specification is 40-80mm. There is a dilute sulfuric acid solution inside the desulfurization tower stabilizing layer 7. The sulfur-containing exhaust gas cooled from the ejector 1 enters the lower part of the desulfurization tower 2, passes through the desulfurization tower stabilizing layer 7 from bottom to top to the top of the desulfurization tower 2 in sequence, and a desulfurization and acid-making reaction occurs inside the desulfurization tower 2 to remove the sulfur-containing components in the exhaust gas.

[0040] The desulfurization tower 2 is connected to the hydrogen peroxide tank 6 through a hydrogen peroxide feeding pump 10, and the hydrogen peroxide from the hydrogen peroxide tank 6 is mixed with the dilute sulfuric acid solution of the desulfurization tower 2 through the hydrogen peroxide pump and input into the upper part of the desulfurization tower 2 (the desulfurization tower steady flow layer 7).

[0041] The turbulent demister 3 is connected to the top of the desulfurization tower 2 through a pipeline, and the process gas from the top of the desulfurization tower 2 enters the turbulent demister 3 to remove the dilute sulfuric acid foam entrained from the desulfurization tower 2 in the process gas.

[0042] The electrostatic demisting device is connected to the turbulent demister 3 through a pipeline, and the process gas from the turbulent demister 3 enters the electrostatic demisting device 4 to remove sulfuric acid droplets in the process.

[0043] Furthermore, the lower part of the tank body of the electrostatic demisting device 4 is connected to the inlet of the turbulator circulation pump 9, and the outlet of the turbulator circulation pump 9 is connected to the upper part of the turbulent demister 3, so that the process gas entrained with mist from the desulfurization tower 2 is washed again through the turbulator circulation pump 9.

[0044] Furthermore, the outlet of the turbulator circulation pump 9 is also connected to the desulfurization tower 2 to utilize the excess solution.

[0045] The exhaust chimney 12 is connected to the electrostatic demisting device through a pipeline. The clean gas from the electrostatic demisting device, from which sulfur dioxide and sulfuric acid mist have been removed, meets the ultra-low emission requirements of pollutants, and is discharged at a high point through the exhaust chimney 12.

[0046] The ejector 1 and the desulfurization tower 2 are made of glass fiber reinforced plastics, the hydrogen peroxide tank 6 is made of stainless steel, and the electrostatic demisting device is made of conductive glass fiber reinforced plastics.

[0047] Working principle:

[0048] 1. The sulfur-containing waste gas from the boundary area undergoes rapid cooling and preliminary desulfurization and acid production in the ejector 1, so that the sulfur-containing waste gas exceeding 100℃~1100℃ is cooled to about 50℃ under the action of the solution entering the ejector 1.

[0049] 2. The cooled sulfur-containing waste gas is in reverse contact with the desulfurization circulating liquid mixed with hydrogen peroxide in the desulfurization tower 2, and a desulfurization and acid production chemical reaction occurs. The sulfur dioxide in the sulfur-containing waste gas reacts with the hydrogen peroxide in the desulfurization circulating liquid to produce SO 2 +H 2 O 2 =H 2 SO 4 At the same time, the hydrogen peroxide feeding pump 10 automatically controls the addition of hydrogen peroxide to reduce the sulfur dioxide concentration in the exhaust gas to 50 mg / m 3 the following.

[0050] 3. The gas after desulfurization carries dilute sulfuric acid droplets. In the turbulent demister 3, the gas-liquid turbulent zone with strong contact formed by the air flow and liquid in the turbulent demister 3 can remove the dilute sulfuric acid droplets carried in the gas with maximum efficiency.

[0051] 4. The gas after the dilute sulfuric acid droplets are removed enters the electrostatic demisting device 4. The electrostatic demisting device 4 is a device that uses the principle of DC high-voltage electric field to discharge electrons through the electric field cathode line to the electric field. The electrons attach to the droplets of the electric field process gas, making the electric field droplets negatively charged. Under the action of the electric field force, the negatively charged droplets approach the anode and are finally adsorbed to the anode tube wall of the electrostatic demisting device. Controlling the electric field voltage of the electrostatic demisting device 4 to be above 70kV can reduce the sulfuric acid droplets in the exhaust gas to the ultra-low emission requirement of 5mg / m 3 the following.

[0052] Example 3

[0053] See also Figures 1 to 3 The utility model provides an embodiment: a device for desulfurizing and producing acid from waste gas containing low concentration sulfur, comprising an ejector 1, a desulfurization tower 2, a turbulent demister 3, an electrostatic demister, an exhaust pipe 12, a hydrogen peroxide feeding pump 10, and a hydrogen peroxide tank 6.

[0054] The injector 1 contains a fluorine material lining that is resistant to high temperatures and strong corrosion. The exhaust gas from outside the boundary area is cooled and partially desulfurized inside the injector 1.

[0055] The lower part of the desulfurization tower 2 is connected to the ejector 1 through a pipeline. The desulfurization tower 2 includes a desulfurization tower stabilizing layer 7. The structure of the desulfurization tower stabilizing layer 7 includes one or more packing layers. The packing layer thickness is 1500-6000mm, and the packing specification is 40-80mm. There is a dilute sulfuric acid solution inside the desulfurization tower stabilizing layer 7. The sulfur-containing exhaust gas cooled from the ejector 1 enters the lower part of the desulfurization tower 2, passes through the desulfurization tower stabilizing layer 7 from bottom to top to the top of the desulfurization tower 2 in sequence, and a desulfurization and acid-making reaction occurs inside the desulfurization tower 2 to remove the sulfur-containing components in the exhaust gas.

[0056] The desulfurization tower 2 is connected to the hydrogen peroxide tank 6 through a hydrogen peroxide feeding pump 10, and the hydrogen peroxide from the hydrogen peroxide tank 6 is mixed with the dilute sulfuric acid solution of the desulfurization tower 2 through the hydrogen peroxide pump and input into the upper part of the desulfurization tower 2 (the desulfurization tower steady flow layer 7).

[0057] Furthermore, the bottom of the desulfurization tower 2 is connected to the inlet of the desulfurization circulation pump 8 through a pipeline, and the outlet of the desulfurization circulation pump 8 is connected to a branch pipe of the outlet pipeline of the hydrogen peroxide feeding pump 10, so as to maintain the circulation of the dilute sulfuric acid solution inside the desulfurization tower 2 and mix it with the hydrogen peroxide. The outlet of the desulfurization circulation pump 8 is also connected to the inlet of the ejector 1, and the solution is input into the ejector 1 to cool the exhaust gas.

[0058] Furthermore, the outlet of the desulfurization circulation pump 8 is also connected to the dilute sulfuric acid tank 4, and a valve is provided between the outlet of the desulfurization circulation pump 8 and the dilute sulfuric acid tank 4. The dilute sulfuric acid tank 4 is connected to the inlet of the dilute sulfuric acid delivery pump 11, and the outlet of the dilute sulfuric acid delivery pump 11 is connected to the boundary area.

[0059] The turbulent demister 3 is connected to the top of the desulfurization tower 2 through a pipeline, and the process gas from the top of the desulfurization tower 2 enters the turbulent demister 3 to remove the dilute sulfuric acid foam entrained from the desulfurization tower 2 in the process gas.

[0060] The electrostatic demisting device is connected to the turbulent demister 3 through a pipeline, and the process gas from the turbulent demister 3 enters the electrostatic demisting device 4 to remove sulfuric acid droplets in the process.

[0061] The exhaust chimney 12 is connected to the electrostatic demisting device through a pipeline. The clean gas from the electrostatic demisting device, from which sulfur dioxide and sulfuric acid mist have been removed, meets the ultra-low emission requirements of pollutants, and is discharged at a high point through the exhaust chimney 12.

[0062] The ejector 1 and the desulfurization tower 2 are made of glass fiber reinforced plastics, the hydrogen peroxide tank 6 is made of stainless steel, and the electrostatic demisting device is made of conductive glass fiber reinforced plastics.

[0063] Working principle:

[0064] 1. The sulfur-containing waste gas from the boundary area undergoes rapid cooling and preliminary desulfurization and acid production in the ejector 1, so that the sulfur-containing waste gas exceeding 100℃~1100℃ is cooled to about 50℃ under the action of the solution entering the ejector 1.

[0065] 2. The cooled sulfur-containing waste gas is in reverse contact with the desulfurization circulating liquid mixed with hydrogen peroxide in the desulfurization tower 2, and a desulfurization and acid production chemical reaction occurs. The sulfur dioxide in the sulfur-containing waste gas reacts with the hydrogen peroxide in the desulfurization circulating liquid to produce SO 2 +H 2 O 2 =H 2 SO 4 At the same time, the hydrogen peroxide feeding pump 10 automatically controls the addition of hydrogen peroxide to reduce the sulfur dioxide concentration in the exhaust gas to 50 mg / m 3 the following.

[0066] 3. The desulfurization and acid production reaction of sulfur dioxide and hydrogen peroxide continues to occur in the desulfurization tower 2, causing H 2 SO 4 When the concentration of dilute sulfuric acid reaches the product standard of 5% to 70%, the dilute sulfuric acid is discharged to the dilute sulfuric acid tank 4 for storage through the valve switch automatically controlled by the desulfurization circulation pump 8.

[0067] 4. The gas after desulfurization carries dilute sulfuric acid droplets. In the turbulent demister 3, the gas-liquid turbulent zone with strong contact formed by the air flow and liquid in the turbulent demister 3 can remove the dilute sulfuric acid droplets carried in the gas with maximum efficiency.

[0068] 5. The gas after the dilute sulfuric acid droplets are removed enters the electrostatic demisting device 4. The electrostatic demisting device 4 is a device that uses the principle of DC high-voltage electric field to discharge electrons through the electric field cathode line to the electric field. The electrons attach to the droplets of the electric field process gas, making the electric field droplets negatively charged. Under the action of the electric field force, the negatively charged droplets approach the anode and are finally adsorbed on the anode tube wall of the electrostatic demisting device. By controlling the electric field voltage of the electrostatic demisting device 4 to be above 70kV, the sulfuric acid droplets in the exhaust gas can be reduced to the ultra-low emission requirement of 5mg / m 3 the following.

[0069] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A device for desulfurizing and producing sulfuric acid from waste gas containing low concentration sulfur, characterized in that: It includes an ejector, a desulfurization tower connected to the ejector at the bottom, a turbulent demister connected to the top of the desulfurization tower, an electrostatic demister connected to the turbulent demister, and an exhaust pipe connected to the electrostatic demister; the upper part of the desulfurization tower is connected to a hydrogen peroxide tank through a hydrogen peroxide feeding pump, and the sulfur-containing waste gas is introduced into the ejector inlet.

2. The device for desulfurizing and producing sulfuric acid from waste gas containing low concentration sulfur according to claim 1, characterized in that: The bottom of the desulfurization tower is connected to the inlet of the desulfurization circulation pump, and the outlet of the desulfurization circulation pump is connected to the outlet of the hydrogen peroxide feeding pump.

3. The device for desulfurizing and producing sulfuric acid from waste gas containing low concentration sulfur according to claim 2, characterized in that: The outlet of the desulfurization circulation pump is also connected to the inlet of the ejector.

4. The device for desulfurizing and producing sulfuric acid from waste gas containing low concentration sulfur according to claim 2, characterized in that: The outlet of the desulfurization circulation pump is also connected to the dilute sulfuric acid tank, and a valve is provided between the outlet of the desulfurization circulation pump and the dilute sulfuric acid tank.

5. The device for desulfurizing and producing sulfuric acid from waste gas containing low concentration sulfur according to claim 4, characterized in that: The dilute sulfuric acid tank is connected to the inlet of the dilute sulfuric acid delivery pump, and the outlet of the dilute sulfuric acid delivery pump is communicated with the boundary area.

6. The device for desulfurizing and producing sulfuric acid from waste gas containing low concentration sulfur according to claim 1, characterized in that: The lower part of the electrostatic demisting device is communicated with the inlet of the turbulator circulation pump, and the outlet of the turbulator circulation pump is communicated with the upper part of the turbulent demister.

7. The device for desulfurizing and producing sulfuric acid from waste gas containing low concentration sulfur according to claim 6, characterized in that: The outlet of the turbulator circulation pump is also connected to the desulfurization tower.

8. The device for desulfurizing and producing sulfuric acid from waste gas containing low concentration sulfur according to claim 1, characterized in that: The ejector and desulfurization tower adopt glass fiber reinforced plastic shells, the hydrogen peroxide adopts stainless steel shells, and the electrostatic demisting device adopts conductive glass fiber reinforced plastic shells.

9. The device for desulfurizing and producing sulfuric acid from waste gas containing low concentration sulfur according to claim 1, characterized in that: The injector contains a fluorine material lining which is resistant to high temperature and strong corrosion.

10. The device for desulfurizing and producing sulfuric acid from waste gas containing low concentration sulfur according to claim 1, characterized in that: The desulfurization tower comprises a desulfurization tower stabilizing layer, and the desulfurization tower stabilizing layer structure has one or more sections of packing layers, and the thickness of the packing layer is 40-80 mm.

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