300MW汽轮机通流改造方案及应用研究  

Study on Flow Path Retrofit Scheme and Application of 300 MW Steam Turbine

作　　者：王军泓 李志高 谭厚章[2] WANG Junhong;LI Zhigao;TAN Houzhang(Shaanxi Weihe Power Generation Co.,Ltd.,Xianyang 712085,Shaanxi,China;Xi'an Jiaotong University,Xi'an 710049,Shaanxi,China)

机构地区：[1]陕西渭河发电有限公司,陕西咸阳712085 [2]西安交通大学,陕西西安710049

出　　处：《能源与节能》2019年第4期77-79,共3页Energy and Energy Conservation

摘　　要：针对国产300 MW汽轮机改造为供热抽汽机组后出现的运行热耗值高、发电煤耗高等安全问题,以及国产引进型300 MW汽轮机出现的部分结构问题,压损以及进汽和漏汽损失等问题,分别对两种机组提出通流结构优化改造方案,在尽可能减少现有设备变动的情况下对汽轮机高、中、低压缸全部进行优化设计。改造后预计汽轮机高压缸效率约达到86%,中压缸达到93%,低压缸达到88%以上;THA工况(热耗率验收工况)下机组热耗率降低约796 kJ/(kW·h),达到8 000 kJ/(kW·h);发电煤耗可下降约29.8 g/(kW·h)(锅炉效率92%,管道效率99%),每年可节约标煤约4.48×10~4t (年发电量1.5×10~9k W·h)。改造方案效果明显,经济效益好,风险较小。Safety problems like the high running heat consumption and the high coal consumption occurred in the domestic 300 MW steam turbine after it was transformed into heating extraction unit, and the partial structural problems, pressure loss, inlet and steam leakage losses appeared in domestically introduced 300 MW steam turbines after transformation. Therefore, this paper proposed flow path retrofit scheme for the two units respectively to optimize the design of all high, medium and low pressure cylinders of steam turbines while minimizing changes in existing equipment. After the transformation, the efficiency of the steam turbine high pressure cylinder is expected to reach 86%, the medium pressure cylinder reaches 93%, and the low pressure cylinder reaches 88%;under the THA working condition(heat rate acceptance condition), the unit heat consumption rate is reduced by about 796 kJ/(kW·h), reaching 8 000 k J/(k W·h);the coal consumption for power generation can be reduced by about 29.8 g/(kW·h)(boiler efficiency is 92%, and pipeline efficiency is 99%), which can save about 4.48×10^4 t of standard coal per year(an annual power generation of 1.5×10^9 k W·h). The transformation plan is of obvious effects, good economic benefits and low risks.

关 键 词：汽轮机 通流改造 供热 电厂 

分 类 号：TM621[电气工程—电力系统及自动化]