Abstract:

The reducing agents for flue gas denitration systems in coal-fired power plants mainly include liquid ammonia, ammonia water and urea. However, the selection of reducing agents in practical project is always a troublesome question. Based on fuzzy comprehensive evaluation method and membership degree principle, the quantitative analysis of evaluation index were carried out for reducing agent, and the evaluation results were obtained according to the principle of maximum membership degree. Then, this paper analyzed the impact of factor weights on the final results according to the actual situation, and obtained the result that liquid ammonia was best. Liquid ammonia, ammonia water and urea all can be used as reducing agent for the SCR denitration system in large units, but liquid ammonia is the best because of its prominent economy characteristics and slightly better technical performance.

Key words: coal-fired power plant, flue gas denitration, reducing agent, fuzzy comprehensive evaluation