T/CI 079-2022 Active

Scope: This document specifies the general technical requirements for the full-dry desulfurization and denitrification of coke oven flue gas in the coke industry, including technical terms and definitions, principles and processes, as well as design, construction, acceptance, operation and maintenance requirements. This document applies to the full-dry desulfurization and denitrification purification systems for coke oven flue gas generated during the coal loading, coke extraction, and coke refining processes, as well as the replacement and discharge of circulating gas in the dry quenching process and the discharge of flue gas from the discharge chutes. The exhaust gas from the acid production unit of the gas purification system should be sent to this desulfurization and denitrification system for unified treatment. It can be used as a technical basis for environmental impact assessments, environmental protection facility design and construction, environmental protection acceptance of construction projects, and post-construction operation and management in the coke chemical industry. Main technical content: 3.1 Full-dry desulfurization The method involves spraying powdered or granular desulfurization agents, adsorbents, or catalysts into the flue gas desulfurization reactor to allow them to fully contact with sulfur-containing gases such as SO2 in the flue gas and remove SO2. At the same time, some inorganic and organic trace substances are removed by physical/chemical adsorption. 3.2 Selective catalytic reduction (SCR) This method uses reducing agents (such as NH3 and urea) to selectively react with NOx in the flue gas under the action of a catalyst to generate nitrogen (N2) and water (H2O). 3.3 Medium-low temperature SCR denitrification This process uses ammonia and urea as reducing agents to selectively catalytically reduce NOx to N2 and H2O at medium-low temperatures (180–280°C) in the flue gas, thereby removing NOx from the flue gas. 3.4 SCR r