CN-121988148-A - Flue gas catalytic desulfurization method based on carbon-based material and atmosphere regulation

Abstract

The invention discloses a flue gas catalytic desulfurization method based on carbon-based materials and atmosphere regulation, which comprises the following steps of mixing sulfur-containing flue gas and oxygen-containing atmosphere to obtain mixed atmosphere, wherein the oxygen content of the mixed atmosphere is 5% -30%, introducing the mixed atmosphere into the carbon-based materials for desulfurization reaction to obtain desulfurized flue gas, and the water content of the carbon-based materials is 5% -15%. SO 2 is adsorbed and dissolved on the surface of the carbon-based material to help the subsequent reaction, the desulfurization efficiency is more than or equal to 95%, the stability of the chemical sulfur fixation product is excellent, the release rate of sulfur element after sulfur fixation is lower than 5%, and the risk of secondary pollution is effectively avoided.

Inventors

• LIU SHIHAO
• SHI QI
• Yan yongzhou
• YANG FABAO
• GAO YAN
• ZHU LIJUAN
• SONG JINXUAN
• CHANG DEZHENG
• WANG XIN
• YANG HAO
• YE ZHIGUO
• HE DANDAN
• CHANG SHENGLI
• GUO FANGFANG
• WANG FANG

Assignees

• 河南省冶金研究所有限责任公司

Dates

Publication Date

20260508

Application Date

20260107

Claims (6)

1. 1. A flue gas catalytic desulfurization method based on carbon-based material and atmosphere regulation is characterized by comprising the following steps: mixing sulfur-containing flue gas and an oxygen-containing atmosphere to obtain a mixed atmosphere, wherein the oxygen content of the mixed atmosphere is 5% -30%; Introducing the mixed atmosphere into a carbon-based material to perform desulfurization reaction to obtain desulfurization flue gas, wherein the water content of the carbon-based material is 5% -15%.
2. 2. The method for flue gas catalytic desulfurization based on carbon-based material and atmosphere control according to claim 1, wherein the oxygen-containing atmosphere is oxygen or air.
3. 3. The flue gas catalytic desulfurization method based on carbon-based materials and atmosphere control according to claim 1, wherein the carbon-based materials are one or more of pulverized coal, coke powder, semicoke, activated carbon, biomass carbon, carbon black, graphite and carbon-based composite materials.
4. 4. The flue gas catalytic desulfurization method based on carbon-based material and atmosphere control as claimed in claim 1, wherein the carbon-based material is located in a reaction device, one end of the reaction device is provided with an air inlet, the other end of the reaction device is provided with an air outlet, the mixed atmosphere enters from the air inlet, and the desulfurization flue gas is output from the air outlet.
5. 5. The flue gas catalytic desulfurization method based on carbon-based materials and atmosphere control as claimed in claim 1, wherein the reaction temperature is 100-300 ℃ and the reaction time is 0.5-120 min during the desulfurization reaction.
6. 6. The flue gas catalytic desulfurization method based on carbon-based materials and atmosphere control as claimed in claim 1, wherein the gas flux of the mixed atmosphere is 50-2000 m 3 /(m 2 & h during the desulfurization reaction.

Description

Flue gas catalytic desulfurization method based on carbon-based material and atmosphere regulation Technical Field The invention relates to the technical field of sulfur-containing flue gas treatment, in particular to a flue gas catalytic desulfurization method based on carbon-based materials and atmosphere regulation. Background Currently in the coal burning industry, sulfur-containing components (primarily sulfur oxides such as SO 2、SO3 and hydrogen sulfide, etc.) are one of the major atmospheric pollutants. In order to control the emission of sulfur-containing components, limestone-gypsum wet method, dry method sodium-based and calcium-based fixed bed desulfurization technologies are commonly used in engineering. The technology is applied to large scale of large thermal power plants and iron and steel enterprises, and 2025 industry reports show that the limestone-gypsum wet method has the removal efficiency of 95% -98.73% for sulfur-containing components (such as 98.73% after a certain 300MW unit is modified), but the unit investment is about 100-200 yuan/(kWh), the by-product gypsum treatment cost is about 50-80 yuan/ton, the dry sodium-based removal efficiency is about 90%, the investment cost is 15% -20%, the annual consumption cost of an adsorbent is increased by more than 30%, and the calcium-based fixed bed removal efficiency is about 85% -90%, but the operation energy consumption is high (25% higher than that of the wet method). Although the method has a certain removal effect, the method has the advantages of high investment, high operation cost, complex byproduct treatment and easy secondary pollution. In addition, the methods all depend on an external desulfurizing agent, and are difficult to popularize in small and medium heat sources, distributed devices or resource-limited scenes. Therefore, there is an urgent need in the industry for new desulfurization technologies that do not require additional desulfurizing agents, are simple in system, and are low in cost. Currently, the main stream dry desulfurization technology comprises an active carbon adsorption method, an electron beam radiation method and a metal oxide desulfurization method. 1. The activated carbon adsorption method refers to that SO 2 is adsorbed by activated carbon and catalyzed and oxidized into sulfur trioxide, and then reacts with water to generate sulfuric acid, and the saturated activated carbon can be regenerated through water washing or heating. The sulfur resource can be recovered, but the adsorption capacity is limited, and the activated carbon needs to be replaced periodically. 2. The electron beam irradiation method refers to irradiating the flue gas with a high energy electron beam to generate active substances to oxidize SO 2 into sulfuric acid, which is then absorbed by ammonia or limestone absorbent. The desulfurization efficiency is high, and nitrogen oxides can be removed at the same time, but the equipment investment is large, and the operation and maintenance requirements are high. 3. The metal oxide desulfurization method is to utilize the adsorptivity of metal oxides such as manganese oxide and zinc oxide to SO 2, react with SO 2 at normal temperature or high temperature to generate metal salts, and regenerate the oxides by thermal decomposition or the like. The desulfurization efficiency is lower, the equipment is huge, and the investment and operation cost are high. Some carbon-based materials (e.g., coke, coal-based activated carbon) have been tried for removal of sulfur-containing components from flue gas because of their porosity and strong adsorption capacity. The method has only physical adsorption function, and has weak capability of converting and fixing sulfur-containing components, for example, the removal efficiency of an activated carbon physical adsorption method is only 60% -80%, the adsorption saturation period is short (about 72-120 hours), the regeneration cost accounts for 40% of the operation cost, and the removal efficiency is low, the treatment is troublesome and the saturated failure is easy. The Chinese patent document No. CN117448501A utilizes the waste heat of low-temperature flue gas of the hot blast stove to dry and synchronously adsorb and remove sulfur-containing components from coal dust, and although the heat energy recovery is combined, the heat energy recovery still only depends on physical adsorption (the efficiency is about 70% -75%), the physical adsorption is unstable, and the secondary release is easy. In order to stabilize the removal, in the prior art, in order to improve the stability of physical adsorption desulfurization, a metal catalyst or a chemical desulfurizing agent is further introduced into an adsorption material, and sulfur-containing oxides in the flue gas are removed by a chemical reaction mode. However, the technical scheme has the following defects that on one hand, the metal catalyst or the desulfurizing agent is introduced to consume extra chemical