工业抽汽机组供热改造的变工况热经济性分析  

Economic Analysis on the Variable Condition of Industrial Extraction Unit for Heating Rebuilding

作　　者：孙士恩 高新勇 庞建锋 

机构地区：[1]华电电力科学研究院,杭州310030

出　　处：《汽轮机技术》2016年第4期301-304,共4页Turbine Technology

摘　　要：以330MW抽凝式机组为例,建立以纯凝工况为基准的供热机组相对经济性分析模型,对机组工业供热改造进行经济性分析。分析结果表明:利用中排抽汽供热时,机组负荷越低,节流损失越大,供热收益越小;且在机组负荷越低之间,节流损失的增加速度越快。高排抽汽供热时,由于机组抽汽压力远高于需求压力,机组负荷越低,抽汽压力越接近需求压力,节流损失越小,收益越明显。因此,对该两种抽汽位置来说,不同机组负荷的情况下,存在临界抽汽量点;且机组负荷越高,临界抽汽量越小。Taken 330 MW extraction condensing turbine as an example, relative economy analysis model as the benchmark in condensing condition is created and heating unit relative economy analysis for heating rebuilding is completed. The results are that when using middle pumping steam for industrial heating, lower unit power load resulted in higher throttling loss and lower heating profit. Besides Throttling loss increases the faster in the range of the lower unit load. When using cold -reheat pumping steam for industrial heating, because the pressure of pumping steam is well above the demand pressure, the lower unit load, the pressure of pumping steam is the closer to the demand pressure, and Throttling loss is the smaller. So for the two kinds of industrial pumping location,there are critical points for pumping steam in different unit load cases. Besides the higher unit load, and the lower critical point for pumping steam.

关 键 词：工业供热 高排抽汽 中排抽汽 临界点 热经济性 

分 类 号：TK26[动力工程及工程热物理—动力机械及工程] TM621[电气工程—电力系统及自动化]