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CN-224207733-U - Device for removing SO2 in flue gas

CN224207733UCN 224207733 UCN224207733 UCN 224207733UCN-224207733-U

Abstract

The utility model relates to the technical field of flue gas desulfurization, and provides a device for removing SO 2 in flue gas, which comprises a heat exchange area, an absorption area and an electrolysis area, wherein the heat exchange area comprises a plate heat exchanger, the plate heat exchanger is communicated with a flue gas inlet channel, the top of the absorption area is provided with a first air outlet, an alkali liquor collecting layer, a spraying layer and a pall ring packing layer are arranged from top to bottom, the spraying layer is communicated with a solution inlet, the electrolysis area is positioned at the bottom of the absorption area and is communicated with the absorption area through a liquid outlet, the electrolysis area comprises an anode electrolysis chamber and a cathode electrolysis chamber, the anode electrolysis chamber is communicated with the plate heat exchanger through a water pump, the cathode electrolysis chamber is provided with a second air outlet, the plate heat exchanger is communicated with the absorption area through a liquid inlet and a gas inlet, and the plate heat exchanger is also communicated with a sulfuric acid collector. The method has the beneficial effects that the method can be suitable for improving the solubility of SO 2 by using the alcohol auxiliary agent, and the effect of efficiently removing SO 2 in flue gas and synchronously preparing sulfuric acid and hydrogen is realized.

Inventors

  • LUO ZIXIAO
  • ZHOU SIYING
  • YANG SIXUAN
  • TAN YU
  • WANG JIAYAN

Assignees

  • 华北电力大学（保定）

Dates

Publication Date
20260508
Application Date
20250604

Claims (6)

  1. 1. The device for removing SO 2 in flue gas is characterized by comprising a heat exchange area, an absorption area and an electrolysis area, wherein the heat exchange area comprises a plate heat exchanger (1), the plate heat exchanger (1) is communicated with a flue gas inlet channel (11), an air outlet I (21) is formed in the top of the absorption area, an alkali liquor collecting layer (22), a spraying layer (23) and a pall ring packing layer (24) are arranged from top to bottom, the spraying layer (23) is communicated with a solution inlet (231), the electrolysis area is positioned at the bottom of the absorption area and is communicated with the absorption area through a liquid outlet (30), the electrolysis area comprises an anode electrolysis chamber (31) and a cathode electrolysis chamber (32), the anode electrolysis chamber (31) is communicated with the plate heat exchanger (1) through a water pump (4), an air outlet II (321) is formed in the cathode electrolysis chamber (32), and the plate heat exchanger (1) is communicated with the absorption area through a liquid inlet (25) and a low-temperature gas inlet (26).
  2. 2. A device for removing SO 2 from flue gas according to claim 1, wherein the plate heat exchanger (1) is further connected to a sulfuric acid collector (5).
  3. 3. A device for removing SO 2 from flue gas according to claim 1, characterised in that the side wall of the absorption zone is fixed with a baffle (27) for introducing the solution into the outlet (30).
  4. 4. A device for removing SO 2 from flue gas according to claim 1, characterised in that the spray layer (23) comprises a number of spiral atomizers, which are fixed to the inner wall of the absorption zone by means of brackets.
  5. 5. A device for removing SO 2 from flue gas according to claim 1, wherein a mist removing device (28) is fixed at the first air outlet (21).
  6. 6. A device for removing SO 2 from flue gas according to claim 1, wherein the side wall of the absorption zone is provided with a viewing port (29).

Description

Device for removing SO 2 in flue gas Technical Field The utility model relates to the technical field of flue gas desulfurization, in particular to a device for removing SO 2 in flue gas. Background In the domestic industry for preparing sulfuric acid from a plurality of SO2, a contact oxidation process is used as a main mode, and is applied to the condition of flue gas with large gas phase component, vanadium catalysts are generally adopted as catalysts, the principle is that flue gas containing SO 2 is produced from sulfur-containing raw materials, SO 2 is subjected to contact oxidation and is converted into sulfur trioxide gas, and the sulfur trioxide generated through conversion treatment is subjected to liquid phase absorption with water, SO that sulfuric acid is generated. The typical two-to-two-suction method is commonly used as a process for producing sulfuric acid, is suitable for flue gas with SO2 concentration higher than 5%, and has a highest SO 2 concentration up to 12.5%. Such atmospheric components of SO 2 must be converted in operation at high temperatures and most require catalyst intervention, thus compromising the overall treatment of low temperature flue gases. Several large copper smelting enterprises in China adopt a desulfurization and sulfur-making process such as an ionic liquid method, a hydrogen peroxide method and the like. Compared with two technologies of flue gas desulfurization and acid preparation, the ionic liquid method needs to be treated in the environment of low-pressure steam, the application range is too small, and certain potential safety hazards exist in transportation and storage of hydrogen peroxide. Therefore, an idea of using alcohol auxiliary agent is proposed, the addition of ethanol can promote SO 2 in water through the action of hydrogen bond between water molecules and SO 2 molecules and utilize the theory that the decomposition voltage of SO 2 aqueous solution is low, namely, the SO 2 OR reaction is utilized to bypass the OER reaction, SO that SO 2 dissolved in water is treated to enable a cathode to generate hydrogen evolution reaction, and the anode adopts the oxidation of SO 32- to replace OER to achieve the effect of reducing the potential of hydrogen production by water electrolysis, and meanwhile, useless O 2 is not generated, and the oxidation is directly utilized to act on SO 2 to achieve the effect of synchronously preparing sulfuric acid and hydrogen. Disclosure of utility model The utility model provides a device for removing SO 2 in flue gas, which is suitable for a method for improving the solubility of SO 2 by using an alcohol auxiliary agent, and can realize the effect of efficiently removing SO 2 in the flue gas and synchronously preparing sulfuric acid and hydrogen. The technical scheme adopted is as follows: The utility model provides a device of SO 2 in desorption flue gas, includes heat transfer area, absorption area and electrolysis district, the heat transfer area includes plate heat exchanger, plate heat exchanger intercommunication flue gas entering passageway, gas outlet one has been seted up at absorption area top to from top to bottom is provided with alkali lye collection layer, sprays layer and pall ring packing layer, it has the solution import to spray the layer intercommunication, the electrolysis district is located the bottom of absorption area and passes through the liquid outlet and the absorption area intercommunication, the electrolysis district includes anode electrolysis room and cathode electrolysis room, anode electrolysis room passes through water pump and plate heat exchanger intercommunication, gas outlet two has been seted up to the cathode electrolysis room, plate heat exchanger passes through inlet and low temperature gas import and absorption area intercommunication. The further technical scheme is that the plate heat exchanger is also communicated with a sulfuric acid collector. The further technical scheme is that a guide plate for guiding the solution into the liquid outlet is fixed on the side wall of the absorption area. The further technical scheme is that the spraying layer comprises a plurality of spiral sprayers, and the plurality of spiral sprayers are fixed on the inner wall of the absorption area through a bracket. The further technical scheme is that a water mist removing device is fixed at one position of the air outlet. The further technical scheme is that an observation port is formed in the side wall of the absorption area. The working principle and the beneficial effects of the application are as follows: The device for removing SO 2 in flue gas can realize the synergistic absorption of SO 2 by using a water-ethanol liquid phase system through a heat exchange area, an absorption area and an electrolysis area, and synchronously prepare sulfuric acid and hydrogen by electrochemical oxidation of SO 2 after heat exchange, SO that pollutant purification and resource utilization are synchronously