SCR脱硝催化剂寿命管理研究

催化剂是燃煤电站SCR脱硝系统的核心，其在运行过程中会缓慢失活，及时更换失活催化剂或者加装新催化剂是保证SCR脱硝系统高效经济运行的关键。以氨逃逸量为评判标准，基于SCR反应器的基础模型和催化剂失活模型，建立了符合脱硝工况实际的催化剂寿命管理模型。该模型以氨氮摩尔比小于1的真实工况为建模条件，综合考虑了反应器入口氨氮摩尔比以及反应器内部各层催化剂入口氨氮摩尔比变化，经与实际催化剂失活时间进行比较，证明所建模型准确，假设催化剂运行工况恰当。在此基础上，根据催化剂更换或者加装情况，给出12种可能的催化剂管理方案，并以催化剂使用寿命为评价标准，从中获得了最优方案。

Study on Life Management of the SCR Denitrification Catalyst

The catalyst is the key element of the SCR denitrification system in the coal-fired power plant. It deactivates gradually during the running process. In-time replacement or supplement of the catalyst not only guarantees the denitrification efficiency, but also reduces the system reaction costs. In this work, with the ammonia slip amount as the evaluation indicator, the catalyst life management model in line with the actual conditions of the denitrification is established based on the basic model of the SCR reactor and the deactivation model of the catalyst. The actual conditions of the ammonia-nitrogen ratio less than 1 are adopted as the modeling conditions, with the changes of the ammonia-nitrogen ratios at the reactor inlet and each catalyst layer in the reactor in consideration. Through comparing with the actual catalyst deactivation time, it is concluded that the model is proved to be accurate and the catalyst operating conditions are assumed properly. On this basis, combining with the catalyst replacement or supplement situation, 12 feasible catalyst management schemes are proposed. The optimal scheme is obtained when the service life of the catalyst is set as the evaluation indicator.