The first domestic blast furnace gas refined desulfurization "hydrolysis + blue carbon adsorption" project

Fine desulfurization of blast furnace gas is a key and difficult issue for ultra-low emissions in the metallurgical industry, and is a major topic for the steel industry to continuously conduct research on process technology. In recent years, Anyang Iron and Steel has determined through continuous exploration and systematic analysis to adopt a new process technology route of "hydrolysis + blue carbon adsorption" for fine desulfurization of blast furnace gas, and integrated engineering design and construction. This project has the advantages of small area, low investment, short construction period, no waste water and gas emissions, and no solid waste and hazardous waste emissions. This technical route is the first of its kind in China. It also solves the technical problem of fine desulfurization of coke oven gas and provides Anyang Steel with a solution for reducing sulfur dioxide emissions in the metallurgical industry. In order to find out the process route of the blast furnace gas fine desulfurization project, Anyang Iron and Steel has sent people to brother enterprises and professional manufacturers to conduct on-site inspections on the treatment technology, operation status, and emission indicators. Based on the actual situation of Anyang Iron and Steel's blast furnace, the layout of the tower body in the hydrolysis section, system resistance loss, hydrolysis efficiency, and desulfurization indicators were discussed. For the most critical components of the project, such as pressurization, hydrolysis and desulfurization, Zezhong Design Company set up a professional team and regarded the hydrolysis unit as a key part. By inspecting pretreatment hydrolysis agent manufacturers and scientific research units, and based on actual conditions, the design and transformation of hydrolysis unit drawings were mastered. The design elements of the hydrolysis unit and supporting facilities were mastered. At the same time, the desulfurization unit was regarded as the core technology to provide support for the overall standard operation of the project.

During the transportation and installation work of the desulfurization tower, the key equipment of the project, the road surface of the limited construction site was hardened in advance, which opened up a new route for the lifting and installation of 12 desulfurization towers with a height of 30 meters and a weight of 70 tons, saving a lot of transportation time. At the same time, the lifting equipment chose to use the 260-ton crawler crane, which is more economical and fully meets the needs of the project. * * Reduced project costs. From on-site investigation to drawing design, from construction to successful commissioning, all employees of Anyang Iron and Steel participated in independent design and construction, and made every effort to overcome the impact of the epidemic. After 68 days and nights, they completed technology development and project construction with high quality and efficiency. This not only demonstrated Anyang Iron and Steel's technology and speed, but also demonstrated the innovative spirit of daring to be the first. It will surely write a strong mark on the high-quality development path of Anyang Iron and Steel. As a technology leader in this field, Anyang Iron and Steel's solution will also play a positive role in the green development and high-quality development of the metallurgical industry.

If this were all applied in steel plants, how big of a project would it be 4@wise man Ming

Blast furnace gas is the combustible gas with the largest output among steel companies, with its statistical output reaching 70-80 billion cubic meters per month. Existing blast furnace gas purification and subsequent applications mainly use bag dust removal to remove particulate matter, and then use TRT residual pressure to generate electricity, and then send it to blast furnace hot blast furnaces, steel rolling heating furnaces, gas power generation and other user units for use as fuel. However, blast furnace gas still contains harmful substances such as sulfur and chlorine. With the promulgation of the "Opinions on Promoting the Implementation of Ultra-Low Emissions in the Steel Industry" (hereinafter referred to as the "Opinions"), the steel industry has officially entered the era of "ultra-low emissions". Users such as blast furnace hot blast stoves, steel rolling heating furnaces, and gas power generation all require combustion tail gas SO2 to reach ultra-low emission limits. However, the existing blast furnace gas purification process cannot meet SO2 control requirements. The current technical route mainly includes source control and terminal treatment after combustion. If the terminal treatment method is adopted, desulfurization facilities need to be installed at multiple points. At the same time, the amount of waste gas after gas combustion is large, and the scale of the treatment facilities becomes larger. ； If we adopt the source control method and implement fine desulfurization of blast furnace gas to reduce the sulfur content in the gas, we can * * Reduce the pressure of terminal treatment and even eliminate the need for terminal treatment facilities. Fine desulfurization of blast furnace gas is a new technological development direction. A literature search shows that there are many individual organic sulfur hydrolysis technologies and dry adsorption removal technologies, and there are also relevant literature reports on blast furnace gas dechlorination. However, there are no reports on blast furnace gas desulfurization or sulfur content control technology, and there are no relevant reports on blast furnace gas desulfurization project cases. Coke oven gas fine desulfurization and chemical industry CO raw gas desulfurization technology and engineering case applications are available for reference. However, due to the particularity of blast furnace gas, the above technologies cannot be directly applied. Therefore, blast furnace gas fine desulfurization technology is still in the cutting-edge exploration stage. In recent years, as blast furnace production has greatly increased the amount of coal injection and the proportion of imported ore, the HCl content in blast furnace gas has increased, and gas pipeline corrosion problems often occur in blast furnace gas main pipes. The implementation of fine desulfurization of blast furnace gas can synergistically treat HCl in the gas and effectively reduce safety risks such as corrosion and leakage of gas main pipes.

The key to blast furnace gas desulfurization lies in the control and reduction of carbonyl sulfide (COS) in the gas. COS is a carbon compound similar in structure to carbon disulfide. The gaseous COS molecules are linear and COS is stable in nature. It is difficult to react directly with other compounds in the oxygen-free environment of blast furnace gas, and the alkali absorption efficiency is low. COS is generally removed from industrial gases by first hydrolyzing and then removing hydrogen sulfide. Hydrogen sulfide can be removed using alkaline liquid absorption methods, physical adsorption methods, etc. Hydrolysis reaction formula: 1) Catalytic hydrolysis of COSH2O→H2SCO2 2) Hydrolysis of COS4H2→H2SCH4 H2O