Zinc oxide desulfurization device for smelting flue gas

Abstract

The utility model relates to the field of flue gas desulfurization and purification, in particular to a zinc oxide desulfurization device for smelting flue gas, which comprises a desulfurization induced draft fan, and is characterized in that one end of the desulfurization induced draft fan is connected with a washing tower reverse spray pipe communicated with the desulfurization induced draft fan in a flange manner, and one end of the washing tower reverse spray pipe is connected with a reverse spray washing tower; according to the zinc oxide slurry desulfurization device, through a zinc oxide slurry desulfurization process, the large-caliber spray head forms a turbulent effect in the reverse spray pipe, so that SO2-containing flue gas is in reverse contact with zinc oxide desulfurization liquid, and zinc sulfite slurry is efficiently generated. Generated zinc sulfite is subjected to acid decomposition, high-concentration SO2 is released for acid making, meanwhile, zinc sulfate is electrolyzed to recover zinc resources, and efficient recycling of sulfur and zinc is achieved; a foam area is formed in a reverse spraying pipe through a large-diameter spraying head and makes full contact with high-temperature flue gas, and the fluid mechanics principle and the aerodynamics principle are ingeniously combined.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of flue gas desulfurization and purification, particularly to a smelting flue gas zinc oxide desulfurization device. BACKGROUND

[0002] Non-ferrous smelting industry, a large amount of flue gas is generated in the production and processing process, and the commonly used flue gas desulfurization methods are roughly wet and dry, among which the wet desulfurization has high stability and is widely used. In copper-zinc smelting enterprises, zinc oxide dust is generated in the flue gas furnace, and zinc oxide belongs to metal oxide and has a certain absorption capacity for SO2. Zinc oxide wet desulfurization is to use zinc oxide as a desulfurizer, and the slurry prepared by mixing zinc oxide (ZnO) with water is contacted with flue gas containing sulfur dioxide (SO2) in an absorption equipment to generate zinc sulfite (and part of zinc bisulfite and zinc sulfate) by reaction for removal. Zinc sulfite is oxidized by air to generate zinc sulfate, and after impurity removal, zinc and sulfuric acid can be recovered by electrolysis. Therefore, using zinc oxide to remove sulfur dioxide in flue gas can greatly reduce the desulfurization cost, and has the advantages of reliable desulfurization absorbent source and recyclable desulfurization byproducts.

[0003] In the smelting process, the flue gas contains a large amount of sulfides (such as SO2), and direct emission will cause serious pollution to the environment, resulting in problems such as acid rain and air pollution. Although the traditional flue gas desulfurization technology (such as limestone-gypsum method, ammonia method, etc.) can effectively desulfurize, it has the disadvantages of complex equipment, high operation cost, and difficult treatment of byproducts. Especially for smelting flue gas containing zinc oxide, the traditional desulfurization technology is difficult to efficiently recover zinc oxide resources, causing resource waste.

[0004] A zinc smelting self-provided power plant flue gas desulfurization device is disclosed in Chinese patent (CN 206121505U): it includes a process water tank, a filtrate tank and an underground tank, the process water tank is connected with a washing tower through a pipeline, and the process water tank is connected with a desulfurization tower through a flushing pipeline, the washing tower is connected with the desulfurization tower through a pipeline, and the washing tower and the desulfurization tower are both provided with a circulating pipeline, the washing tower is connected with a degassing tower through a pipeline, and the filtrate tank and the underground tank are both connected with the desulfurization tower through a pipeline, but this flue gas desulfurization device has the disadvantages of complex equipment, high operation cost, and difficult treatment of byproducts. Especially for smelting flue gas containing zinc oxide, the traditional desulfurization technology is difficult to efficiently recover zinc oxide resources, causing resource waste, therefore, a smelting flue gas zinc oxide desulfurization device is needed. UTILITY MODEL CONTENTS

[0005] The purpose of this invention is to provide a process and apparatus for cooling and dust removal of furnace flue gas, further removal of fluoride and chloride ions, followed by zinc oxide wet desulfurization, and then acid decomposition to recover SO2 for acid production and obtain zinc sulfate that meets the requirements for electrolysis. Specifically, the furnace flue gas, after pre-dust removal, undergoes reverse-jet scrubbing for cooling and dust removal, and further removal of fluoride and chloride ions. It then undergoes wet desulfurization with zinc oxide produced by the fuming furnace. The desulfurization byproduct, zinc sulfite, is decomposed by waste acid from electrolysis to recover SO2 for acid production. Simultaneously, the dust removal and fluoride and chloride ion removal processes before desulfurization yield zinc sulfate for electrolysis that meets the required quality for electrolysis after acid decomposition. The system operates without secondary pollution, valuable resources are recovered and utilized, environmental protection investment drives economic efficiency, and meets the sustainable development needs of enterprises.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a zinc oxide desulfurization device for smelting flue gas, including a desulfurization induced draft fan, characterized in that: one end of the desulfurization induced draft fan is connected to a backspray pipe of a scrubbing tower that is flange-connected to the desulfurization induced draft fan; one end of the backspray pipe of the scrubbing tower is connected to a backspray scrubbing tower; the top of the backspray scrubbing tower is provided with a top outlet; one end of the top outlet is connected to an absorption desulfurization tower; one end of the absorption desulfurization tower is connected to a wet electrostatic precipitator; one end of the absorption desulfurization tower is connected to a desulfurization slurry circulation tank; one end of the desulfurization slurry circulation tank is connected to a desulfurization circulation pump; one end of the desulfurization circulation pump is connected to a reaction device that is flange-connected to the desulfurization circulation pump; one end of the desulfurization circulation pump is connected to a backspray pipe of the desulfurization tower that is flange-connected to the desulfurization circulation pump; the backspray pipe of the desulfurization tower is associated with the absorption desulfurization tower; and one end of the backspray scrubbing tower and the absorption desulfurization tower are connected to a process water system. High-efficiency desulfurization: The dual desulfurization design of the reverse-jet scrubbing tower and the absorption desulfurization tower can fully absorb sulfides in the flue gas, improving desulfurization efficiency; Modular design: The components are connected by flanges, which facilitates installation, disassembly and maintenance, improving the flexibility and operability of the unit; Resource recycling: The design of the desulfurization slurry circulation tank and desulfurization circulation pump realizes the recycling of desulfurization slurry, reducing resource waste; Optimized process water system: The reverse-jet scrubbing tower and the absorption desulfurization tower share the same process water system, simplifying the process flow and reducing operating costs.

[0007] Preferably, the reaction apparatus includes a primary reaction tank, a secondary reaction tank, and a multi-stage reaction tank, which are interconnected and coordinated. One end of the top of the primary reaction tank is connected to a high-level decomposition liquid tank, and one end of the high-level decomposition liquid tank is connected to a decomposition liquid system. One end of the top of the multi-stage reaction tank is connected to a decomposition gas intake circulation machine, and one end of the decomposition gas intake circulation machine is connected to a decomposition gas intake system for acid production. Through the step-by-step reactions in the primary, secondary, and multi-stage reaction tanks, sulfides can be fully decomposed and absorbed, improving the desulfurization effect. The high-level decomposition liquid tank and the decomposition liquid system provide sufficient decomposition liquid to the reaction tanks, ensuring the continuity and stability of the reaction process. The wet electrostatic precipitator can effectively remove droplets and particulate matter generated during the reaction process, improving the flue gas purification effect.

[0008] Preferably, the primary reaction tank, secondary reaction tank, and multi-stage reaction tank are all connected to a sulfuric acid circulating tank. One end of the sulfuric acid circulating tank is connected to a sulfuric acid circulating pump, and the other end of the sulfuric acid circulating pump is connected to an acidolysis system. The sulfuric acid circulating tank collects and stores the desulfurization liquid from the reaction tanks, realizing the recycling of the desulfurization liquid and reducing operating costs. The sulfuric acid circulating pump transports the desulfurization liquid to the acidolysis system, ensuring the continuity and efficiency of the acidolysis process. The acidolysis system can further process the desulfurization liquid to generate recyclable sulfuric acid products, achieving comprehensive resource utilization.

[0009] Preferably, the backspray nozzle of the scrubbing tower includes an upper large-diameter backspray nozzle and a lower large-diameter backspray nozzle. The dual-nozzle design allows both the upper and lower large-diameter backspray nozzles to cover a larger spray area, improving the contact efficiency between the flue gas and the desulfurization liquid; the dual-nozzle design also allows for more uniform distribution of the desulfurization liquid, ensuring that sulfides in the flue gas are fully absorbed; and the large-diameter nozzle design reduces the possibility of clogging and improves the operational stability of the device.

[0010] Preferably, a backspray circulation pump is connected to one side of the backspray pipe via a flange, and a wastewater treatment system is connected to one end of the backspray circulation pump via a flange. The backspray circulation pump transports wastewater from the backspray pipe of the scrubbing tower to the wastewater treatment system, ensuring that the wastewater is effectively treated and meets environmental protection requirements. The wastewater treatment system can recover useful components from the wastewater, reducing resource waste. By introducing the wastewater treatment system, the environmental impact of the device is reduced, and the environmental performance of the device is improved.

[0011] Preferably, one end of the absorption desulfurization tower is connected to a zinc oxide slurry circulation pump, one end of the zinc oxide slurry circulation pump is connected to a zinc oxide slurry storage tank, and one end of the zinc oxide slurry storage tank is connected to a zinc oxide slurry system. The zinc oxide slurry circulation pump and the zinc oxide slurry storage tank enable the recycling of zinc oxide slurry, reducing operating costs; the zinc oxide slurry system can provide sufficient zinc oxide slurry to the absorption desulfurization tower, ensuring the high efficiency of the desulfurization process; and the zinc oxide slurry system can recover the zinc oxide products generated during the desulfurization process, achieving comprehensive resource utilization.

[0012] The advantages of this utility model are:

[0013] This application utilizes a zinc oxide slurry desulfurization process. A large-diameter nozzle creates a turbulent effect in the reverse spray pipe, causing SO2-containing flue gas to come into countercurrent contact with the zinc oxide desulfurization liquid, efficiently generating zinc sulfite slurry. The generated zinc sulfite is decomposed by acid, releasing high-concentration SO2 for acid production. Simultaneously, zinc sulfate is electrolyzed to recover zinc resources, achieving efficient recovery and utilization of sulfur and zinc. The large-diameter nozzle creates a foam zone in the reverse spray pipe, ensuring full contact with the high-temperature flue gas. By cleverly combining fluid mechanics and aerodynamics principles, the gas, solid, and liquid phases maintain prolonged and sufficient contact, achieving efficient cooling, dust removal, and fluoride / chloride ion removal. The large-diameter nozzle's reverse spray washing and desulfurization avoids the clogging problem of traditional atomizing nozzles. The generated zinc sulfite has high viscosity. A separate circulation tank with thorough stirring is used to prevent sedimentation and clogging of equipment and pipelines. Traditional ZnSO3 oxidation to ZnSO4 process is energy-intensive and its oxidation efficiency is difficult to control. This device uses a ZnSO3 acid decomposition process to release SO2 for acid production, resulting in a more stable and controllable process with significantly reduced energy consumption. It fully utilizes the production characteristics of copper and zinc smelting enterprises, achieving self-sufficiency in desulfurizing zinc oxide powder. The desulfurization byproduct, zinc sulfite, is decomposed to recover SO2 for acid production, and zinc sulfate is electrolyzed to recover zinc resources, maximizing resource utilization. The device adopts a modular design, with components connected by flanges, facilitating installation, disassembly, and maintenance. It is flexible in operation and highly adaptable. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Please see Figure 1 As shown:

[0016] Figure 1 This is a schematic diagram of the workflow of this utility model;

[0017] In the diagram: 1. Zinc oxide slurry system; 2. Zinc oxide slurry storage tank; 3. Zinc oxide slurry circulation pump; 4. Wet electrostatic precipitator; 5. Desulfurization tower backspray nozzle; 6. Absorption desulfurization tower; 7. Desulfurization slurry circulation tank; 8. Desulfurization circulation pump; 9. Process water system; 10. Desulfurization induced draft fan; 11. Upper large-diameter backspray nozzle; 12. Scrubber backspray nozzle; 13. Top outlet; 14. Lower large-diameter backspray nozzle; 15. Backspray circulation pump; 16. Backspray scrubbing tower; 17. Wastewater treatment system; 18. Decomposition liquid system; 19. Decomposition liquid high-level tank; 20. Decomposition air intake to acid production system; 21. Decomposition air intake circulation machine; 22. Primary reaction tank; 23. Secondary reaction tank; 24. Multi-stage reaction tank; 25. Sulfuric acid circulation tank; 26. Sulfuric acid circulation pump; 27. Acidolysis system. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0019] Example

[0020] Please see Figure 1 As shown:

[0021] Example: A zinc oxide desulfurization device for smelting flue gas, comprising a desulfurization induced draft fan 10, characterized in that: one end of the desulfurization induced draft fan 10 is connected to a backspray nozzle 12 of a scrubbing tower, which is flange-connected to the desulfurization induced draft fan 10; one end of the backspray nozzle 12 is connected to a backspray scrubbing tower 16; the backspray scrubbing tower 16 has a top outlet 13 at its top; one end of the top outlet 13 is connected to an absorption desulfurization tower 6; one end of the absorption desulfurization tower 6 is connected to a wet electrostatic precipitator 4, which can effectively remove the products generated during the reaction process. The desulfurization tower 6 is connected to a desulfurization slurry circulation tank at one end, and a desulfurization circulation pump 8 at one end. A reaction device connected to the desulfurization circulation pump 8 via a flange is connected to the desulfurization circulation pump 8 at one end. A desulfurization tower backspray pipe 5 connected to the desulfurization circulation pump 8 via a flange is also connected to the desulfurization tower backspray pipe 5. The desulfurization tower backspray pipe 5 is associated with the absorption desulfurization tower 6. The backspray scrubbing tower 16 and the absorption desulfurization tower 6 are connected together to a process water system 9 at one end. High-efficiency desulfurization: The dual desulfurization design of the reverse-jet scrubbing tower 16 and the absorption desulfurization tower 6 can fully absorb sulfides in the flue gas, improving desulfurization efficiency; Modular design: The components are connected by flanges, which facilitates installation, disassembly and maintenance, improving the flexibility and operability of the unit; Resource recycling: The design of the desulfurization slurry circulation tank 7 and the desulfurization circulation pump 8 realizes the recycling of desulfurization slurry, reducing resource waste; Optimized process water system 9: The reverse-jet scrubbing tower 16 and the absorption desulfurization tower 6 share the process water system 9, simplifying the process flow and reducing operating costs.

[0022] In this embodiment, the reaction device includes a primary reaction tank 22, a secondary reaction tank 23, and a multi-stage reaction tank 24. The primary reaction tank 22, the secondary reaction tank 23, and the multi-stage reaction tank 24 are interconnected and cooperate with each other. One end of the top of the primary reaction tank 22 is connected to a decomposition liquid high-level tank 19, and one end of the decomposition liquid high-level tank 19 is connected to a decomposition liquid system 18. One end of the top of the multi-stage reaction tank 24 is connected to a decomposition gas absorption and circulation machine 21, and one end of the decomposition gas absorption and circulation machine 21 is connected to a decomposition gas absorption and acid production system 20. Through the step-by-step reaction in the primary, secondary, and multi-stage reaction tanks 24, sulfides can be fully decomposed and absorbed, improving the desulfurization effect. The high-level decomposition liquid tank 19 and the decomposition liquid system 18 provide sufficient decomposition liquid to the reaction tanks, ensuring the continuity and stability of the reaction process. The decomposition gas recirculation machine 21 efficiently extracts the sulfur dioxide gas generated during acid decomposition through a negative pressure system, ensuring that the gas concentration in the reaction tank is kept at a low level, thereby promoting the continuous progress of the acid decomposition reaction and improving the reaction efficiency. The decomposition gas recirculation machine 21 transports the sulfur dioxide gas to the acid production system for the production of sulfuric acid, realizing the efficient recovery and utilization of sulfur resources and reducing resource waste.

[0023] In this embodiment, the primary reaction tank 22, the secondary reaction tank 23, and the multi-stage reaction tank 24 are all connected to a sulfuric acid circulating liquid tank 25. One end of the sulfuric acid circulating liquid tank 25 is connected to a sulfuric acid circulating pump 26, and the other end of the sulfuric acid circulating pump 26 is connected to an acidolysis system 27. The sulfuric acid circulating liquid tank 25 collects and stores the desulfurization liquid in the reaction tanks, realizing the recycling of the desulfurization liquid and reducing operating costs. The sulfuric acid circulating pump 26 transports the desulfurization liquid to the acidolysis system 27, ensuring the continuity and efficiency of the acidolysis process. The acidolysis system 27 can further process the desulfurization liquid to generate recyclable sulfuric acid products, realizing the comprehensive utilization of resources.

[0024] In this embodiment, the backspray nozzle 12 of the scrubbing tower includes an upper large-diameter backspray nozzle 11 and a lower large-diameter backspray nozzle 14. The dual-nozzle design allows the upper large-diameter backspray nozzle 11 and the lower large-diameter backspray nozzle 14 to cover a larger spray area, improving the contact efficiency between the flue gas and the desulfurization liquid. The dual-nozzle design also allows for more uniform distribution of the desulfurization liquid, ensuring that sulfides in the flue gas are fully absorbed. Furthermore, the large-diameter nozzle design reduces the possibility of clogging and improves the operational stability of the device.

[0025] In this embodiment, a backspray circulation pump 15 is connected to one side of the backspray pipe via a flange, and a wastewater treatment system 17 is connected to one end of the backspray circulation pump 15 via a flange. The backspray circulation pump 15 transports wastewater from the backspray pipe 12 of the scrubbing tower to the wastewater treatment system 17, ensuring that the wastewater is effectively treated and meets environmental protection requirements. The wastewater treatment system 17 can recover useful components from the wastewater, reducing resource waste. By introducing the wastewater treatment system 17, the environmental impact of the device is reduced, and the environmental performance of the device is improved.

[0026] In this embodiment, one end of the absorption desulfurization tower 6 is connected to a zinc oxide slurry circulation pump 3, one end of the zinc oxide slurry circulation pump 3 is connected to a zinc oxide slurry storage tank 2, and one end of the zinc oxide slurry storage tank 2 is connected to a zinc oxide slurry system 1. The zinc oxide slurry circulation pump 3 and the zinc oxide slurry storage tank 2 enable the recycling of zinc oxide slurry, reducing operating costs; the zinc oxide slurry system 1 can provide sufficient zinc oxide slurry to the absorption desulfurization tower 6, ensuring the high efficiency of the desulfurization process; the zinc oxide slurry system 1 can recover the zinc oxide products generated during the desulfurization process, realizing the comprehensive utilization of resources.

[0027] The working principle of this embodiment:

[0028] (1) Flue gas pretreatment:

[0029] In copper-zinc smelting enterprises, the flue gas from furnaces and kilns undergoes preliminary dust removal via electrostatic precipitators. However, the flue gas still contains high concentrations of dust, fluoride, and chloride ions. If zinc oxide desulfurization is performed directly, fluoride ions will enter the zinc sulfate solution, leading to complex and costly subsequent electrolysis processes. Therefore, further cooling, dust removal, and fluoride and chloride ion removal are necessary before desulfurization.

[0030] (2) Treatment by reverse jet scrubber 16:

[0031] Flue gas is conveyed to the reverse spray scrubbing tower 16 by the desulfurization induced draft fan 10, and enters the reverse spray pipe of the reverse spray scrubbing tower 16 from top to bottom; the upper part of the reverse spray pipe is equipped with a large-diameter reverse spray nozzle, which sprays process water for washing; the lower part is equipped with a large-diameter reverse spray nozzle, which sprays the circulating liquid in the scrubbing tower for secondary washing; through the spray washing of the upper and lower nozzles, the flue gas temperature drops from about 230℃ to 50-60℃, while removing dust and fluoride and chloride ions; the washing circulating liquid is periodically discharged to the sewage treatment system 17 for treatment by the circulating pump to ensure the cleanliness of the washing liquid; the flue gas after cooling and dust removal enters the absorption desulfurization tower 6 from the top outlet 13 of the scrubbing tower.

[0032] (3) Desulfurization in absorption desulfurization tower 6:

[0033] After cooling and dust removal, the SO2-containing flue gas enters the absorption desulfurization tower 6 and passes through the reverse spray pipe of the absorption desulfurization tower 6 from top to bottom. The large-diameter nozzle in the reverse spray pipe sprays zinc oxide desulfurization slurry, which forms a gas-liquid countercurrent contact with the flue gas and reacts fully to generate zinc sulfite slurry.

[0034] Desulfurization principle:

[0035] SO2 dissolves in water: SO2 + H2O → H2SO3

[0036] Absorption reaction: ZnO + H₂SO₃ → ZnSO₃ + H₂O

[0037] The generated zinc sulfite slurry and the remaining zinc oxide slurry enter the storage area at the bottom of the absorption desulfurization tower 6. Through liquid level control and pressure difference, they slide down to the desulfurization slurry circulation tank 7. The slurry in the desulfurization slurry circulation tank 7 is transported to the reverse spray pipe by the desulfurization circulation pump 8 for circulating spray desulfurization to ensure desulfurization efficiency.

[0038] (4) Zinc oxide slurry replenishment:

[0039] A zinc oxide slurry with a solid content of 10-15% is prepared in the zinc oxide slurry storage tank. It is replenished to the absorption desulfurization tower 6 by the zinc oxide slurry circulation pump at regular intervals to ensure a sufficient supply of desulfurizing agent. The replenished zinc oxide slurry and the circulating slurry are fully stirred and mixed in the desulfurization slurry circulation tank 7 to improve the desulfurization efficiency.

[0040] (5) Flue gas purification and emission:

[0041] The purified flue gas after desulfurization enters the wet electrostatic precipitator 4 to remove moisture and residual particulate matter from the flue gas.

[0042] The purified flue gas is discharged through a chimney to ensure that the emissions meet environmental protection standards;

[0043] (6) Zinc sulfite decomposition:

[0044] The desulfurization slurry (containing zinc sulfite and residual zinc oxide) in the desulfurization tower 6 enters the sulfuric acid circulating liquid tank 25. By fully stirring, sedimentation is avoided. Most of the slurry is transported to the reverse spray pipe for circulating spray desulfurization via the desulfurization circulating pump 8, and a small portion of the slurry is transported to the acidolysis system 27 via the sulfuric acid circulating pump 26. In the acidolysis system 27, zinc sulfite and the waste acid after electrolysis react step by step in the multi-stage reaction tank 24, completely decomposing to generate zinc sulfate solution and sulfur dioxide gas.

[0045] Acid decomposition reaction:

[0046] ZnSO3+H2SO4→ZnSO4+SO2↑+H2O

[0047] ZnO + H₂SO₄ → ZnSO₄ + H₂O

[0048] The generated sulfur dioxide gas is returned to the acid production system through a negative pressure system to produce acid, realizing the recycling of sulfur resources. The decomposition gas extraction and circulation machine 21 efficiently extracts the sulfur dioxide gas generated in the reaction tank through the negative pressure system, ensuring that the gas concentration in the reaction tank is kept at a low level and promoting the continuous progress of the acid decomposition reaction.

[0049] (7) Zinc sulfate solution recovery:

[0050] The zinc sulfate solution produced after acid decomposition is sent to the zinc electrolysis system via a zinc sulfate solution transfer pump to recover zinc resources and maximize resource utilization.

[0051] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A smelting flue gas zinc oxide desulphurization plant comprising a desulphurization induced draft fan (10), characterized in that: The desulfurization induced draft fan (10) is connected with a flange type communication washing tower reverse jet pipe (12) at one end, the washing tower reverse jet pipe (12) is connected with a reverse jet washing tower (16) at one end, the reverse jet washing tower (16) is provided with a top outlet (13) at the top, the top outlet (13) is connected with an absorption desulfurization tower (6) at one end, the absorption desulfurization tower (6) is connected with a wet type electric demister (4) at one end, the absorption desulfurization tower (6) is connected with a desulfurization slurry circulating tank at one end, the desulfurization slurry circulating tank (7) is connected with a desulfurization circulating pump (8) at one end, the desulfurization circulating pump (8) is connected with a reaction device in flange type communication with the desulfurization circulating pump (8) at one end, the desulfurization circulating pump (8) is connected with a desulfurization tower reverse jet pipe (5) in flange type communication with the desulfurization circulating pump (8) at one end, the desulfurization tower reverse jet pipe (5) is associated with the absorption desulfurization tower (6), and the reverse jet washing tower (16) and the absorption desulfurization tower (6) are jointly connected with a process water system (9) at one end.

2. A metallurgical off-gas zinc oxide desulphurization device as claimed in claim 1, characterized in that: The reaction device comprises a first-stage reaction tank (22), a second-stage reaction tank (23) and a multi-stage reaction tank (24), the first-stage reaction tank (22), the second-stage reaction tank (23) and the multi-stage reaction tank (24) are associated and cooperated with each other, the first-stage reaction tank (22) is connected with a decomposition liquid head tank (19) at one end of the top, the decomposition liquid head tank (19) is connected with a decomposition liquid system (18) at one end, and the multi-stage reaction tank (24) is connected with a decomposition gas suction circulating machine (21) at one end of the top, the decomposition gas suction circulating machine (21) is connected with a decomposition gas suction acid making system (20) at one end.

3. A metallurgical off-gas zinc oxide desulphurization device as claimed in claim 1, wherein: The first-stage reaction tank (22), the second-stage reaction tank (23) and the multi-stage reaction tank (24) are jointly connected with a sulfuric acid circulating liquid tank (25), the sulfuric acid circulating liquid tank (25) is connected with a sulfuric acid liquid circulating pump (26) at one end, and the sulfuric acid liquid circulating pump (26) is connected with an acid decomposition system (27) at one end.

4. A metallurgical off-gas zinc oxide desulphurization device as claimed in claim 1, wherein: The washing tower reverse jet pipe (12) comprises an upper large-diameter reverse jet nozzle (11) and a lower large-diameter reverse jet nozzle (14).

5. A metallurgical off-gas desulphurization unit for zinc oxide as claimed in claim 1, wherein: The reverse jet pipe is connected with a reverse jet circulating pump (15) in flange type communication with the reverse jet pipe at one side, the reverse jet circulating pump (15) is connected with a sewage treatment system (17) in flange type communication with the reverse jet circulating pump (15) at one end.

6. A metallurgical off-gas zinc oxide desulphurization unit as claimed in claim 1, wherein: The absorption desulfurization tower (6) is connected with a zinc oxide slurry circulating pump (3) at one end, the zinc oxide slurry circulating pump (3) is connected with a zinc oxide slurry storage tank (2) at one end, and the zinc oxide slurry storage tank (2) is connected with a zinc oxide slurry system (1) at one end.

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