多流量低温省煤器最优设计通用数学模型  

A General-purposed Mathematical Model for Optimal Design of Multi-flow Low Temperature Economizers

作　　者：谭良红 胡三高[1] 赵艳[1] 汪喆[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《热能动力工程》2015年第6期911-915,974,共5页Journal of Engineering for Thermal Energy and Power

摘　　要：针对锅炉的低温省煤器,本研究提出一种多流量的连接方式,并对这种连接方式的连接准则以及由此造成的机组经济性影响进行了分析。考虑投资、动力消耗以及燃煤的收益,以纯收益的最大值为目标函数,建立低温省煤器最优设计的数学模型,并以N200-12.75/535/535机组为例进行计算,计算结果表明:与单一流量模型相比,多流量模型减少了低参数抽汽的排挤,增多了高参数抽汽的排挤,更好地实现烟气余热的梯级利用,煤耗降低了0.5 g/(kW·h),并且换热面积降低了1 000 m^2,减小了初始化投资和风机与泵的功耗。For low temperature economizers in boilers,proposed was a multi-flow connection mode,of which the connection criteria and the resulting influence on the cost-effectiveness of the unit were analyzed. Under the condition of the total investment,power consumption and amount of coal burned being taken into account and with the maximal pure income serving as the object of study,a mathematical model for optimal design of low temperature economizers was established and with a N200-12. 75 /535 /535 unit serving as an example,a calculation was performed. The calculation results show that compared with a single-flow economizer,a multi-flow economizer can increase the amount of steam extracted at low parameters and at the same time decrease that at high parameters,thus better realizing a stepped utilization of waste heat from flue gases,reducing the coal consumption by 0. 5 g /( Kw. h),cutting the heat exchange area by 1 000 square meters and minimizing the initial investment and the power consumed by the fans and pumps.

关 键 词：电站锅炉 低温省煤器 优化设计 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]