供热机组深度调峰中供热方式的优化改造

Optimization Retrofit on Heat Supply Modes of Heating Units for Deep Peak-load Regulation

对供热机组深度调峰的供热方式进行了优化改造,并对不同抽汽点供热的经济性进行了分析。结果表明:在低负荷下,分别用主蒸汽、冷段再热蒸汽和热段再热蒸汽供热这3种改造方案均可满足供热蒸汽参数要求;在40%THA负荷下,冷段再热蒸汽供热的经济性最好;在30%THA负荷下,主蒸汽供热和冷段再热蒸汽供热的经济性在不同供热质量流量下有所差异;若负荷进一步降低,主蒸汽供热优势更为明显。

An optimization retrofit was carried out on the heat supply mode of heating units for deep peak-load regulation,while an economic analysis was performed on the unit by extracting the steam from different points.Results show that under low load conditions,all the three retrofit schemes with steam extracted respectively from main steam pipe,cold reheat steam pipe and hot reheat steam pipe could satisfy the requirements of heating steam parameters.At 40%THA load,the highest economy of heat supply appears in the scheme with steam extracted from cold reheat steam pipe;whereas at 30%THA load,the economy of heat supply is different between main steam mode and cold reheat steam mode under different heating steam flows.With the reduction of unit load,the advantage of heat supply becomes more obvious in the main steam mode.