Tham khảo tài liệu 'air pollution control systems for boiler and incinerators part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | TM 5-815-1 AFR 19-6 c. Copper oxide is used as the acceptor for SO2 removal forming copper sulfate. Subsequently both the copper sulfate which was formed and the copper oxide catalyze the reduction of NO to nitrogen and water by reaction with ammonia. A regeneration step produces an SO2 rich steam which can be used to manufacture by-products such as sulfuric acid. 11-5. Step-by-step NOx reduction method a. Applicability. The application of NOx reduction techniques in stationary combustion boilers is not extensive. However NOx reduction techniques have been extensively applied on automobiles. These techniques have been confined to large industrial and utility boilers where they can be more easily implemented where NOx emissions standards apply and where equipment modifications are more economically justified. However some form of NOx control is available for all fuel-burning boilers without sacrificing unit output or operating efficiency. Such controls may become more widespread as emission regulations are broadened to include all fuel-burning boilers. b. Implementation. The ability to implement a particular combustion modification technique is dependent upon furnace design size and the degree of equipment operational control. In many cases the cost of conversion to implement a modification such as flue-gas recirculation may not be economically justified. Therefore the practical and economic aspects of boiler design and operational modifications must be ascertained before implementing a specific reduction technique. 1 Temperature reduction through the use of two stage combustion and flue-gas recirculation is most applicable to high heat release boilers with a multiplicity of burners such as utility and large industrial boilers. 2 Low excess air operation LEA coupled with flue-gas recirculation offers the most viable solution in smaller industrial and commercial size boilers. These units are normally designed for lower heat rates furnace temperature and generally .
