旁路放风余热循环利用系统优化及经济性分析

Optimization and Economic Analysis of Bypass Ventilation Waste Heat Recycling System

增设旁路放风系统是解决水泥窑采用固废原燃材料导致水泥产品质量劣化的有效途径,但传统旁路放风系统存在废弃余热资源浪费的问题。为提高水泥窑余热资源的利用率,在传统旁路放风余热利用系统的基础上进行了工艺优化,通过采用混合BP锅炉排烟取代混合环境冷风,回收了绝大部分的烟气余热资源,增加了余热电站的发电量。以某5000t/d水泥生产线余热发电项目为例,对比分析了两种工艺流程的经济性。结果表明,采用优化后的旁路放风余热锅炉烟气循环系统,年可增加经济效益296.27万元,减少废气排放量42750Nm^(3)/h,社会效益和经济效益显著。

Adding a bypass ventilation system is an effective way to solve the problem of cement product quality deterioration caused by the use of solid waste raw materials in cement kilns.However,traditional bypass ventilation systems suffer from the waste of waste heat resources.In order to improve the utilization rate of waste heat resources in cement kilns,process optimization was carried out on the basis of the traditional bypass ventilation waste heat utilization system.By replacing the mixed ambient cold air with mixed BP boiler exhaust,the vast majority of gas waste heat resources were recovered,increasing the power generation capacity of the waste heat power plant.Taking a 5000t/d cement production line waste heat power generation project as an example,the economic feasibility of two process flows was compared and analyzed.The results show that adopting the optimized bypass ventilation waste heat boiler flue gas circulation system can increase economic benefits by 2.9627 million yuan annually,reduce exhaust gas emissions by 42750 Nm^(3)/h,and achieve significant social and economic benefits.