超超临界机组无省煤器改造及优化

以一台1 000 MW超超临界机组为研究对象,将锅炉、汽轮机及发电厂热力系统作为一个整体,针对超超临界机组的特性,对其锅炉进行无省煤器改造,并相应地通过增加一级高压加热器来替代省煤器的给水加热的作用.改造后的机组流量发生改变,锅炉内的工质在各个受热面内的吸热量也发生了变化;最后对回热系统进行优化.研究结果表明:改造后的锅炉效率基本保持不变,锅炉的效率由54.0%增加到了54.4%,全厂供电标准煤耗由304 g/kWh降低至302.9 g/kWh.

The Optimization of the Ultra supercritical Coal Fired Power Plant Without Economizer

Taking a 1000MW ultra supercritical unit as the research object, the transformation of the unit without economizer was studied. The boiler, turbine and thermal system of the power plant were considered as a whole. A high pressure heater was added to the unit. The flow rate of the unit was changed and as a result, the heat absorption of the boiler heating surface was also changed. The heat regenerative system was optimized. The results have shown that the exergy efficiency of the boiler increased from 54.0% to 54.4%. Standard coal consumption rate of power supply is reduced from 304 g/kWh to 302.9 g/kWh.