摘要
重新设计喷嘴组的通流面积后,提高机组在中低负荷区域的运行压力。75%左右负荷,机组在二阀点下运行,主汽压力从13.56 MPa提高到16.7 MPa。由于部分进汽度有所增加,部分进汽损失的增加,高压缸的效率下降了0.48%。主汽压力提升,高压缸做功量增加25.8 kJ/kg。从单位蒸汽做功量变化和吸热量变化上进行分析,75%左右负荷下机组热循环效率提高0.62%,机组供电煤耗下降3.5 g/kWh。所以,通流面积重新设计后结合蒸汽参数的变化,机组在中低负荷区域的经济性明显提升。
After redesign of nozzle group flow path area,the operating pressure of the unit in the middle and low load region can be improved.At around 75% load,the Unit was running under the two-valves opening condition,the main steam pressure was increased from 13.56 MPa to 16.7 MPa.As the partial admission degree increased,the loss increases,and the high pressure cylinder efficiency would be droped 0.48%.With the main steam pressure increasing,the working quantity of the high pressure cylinder increased 25.8 kJ/kg.Analyzing on the steam power changes and heat changes,the unit thermal cycle efficiency improved 0.62% under 75% load.The coal consumption of power supply reduced by 3.5 g/kWh.Therefore,with the flow area redesigned and the steam parameters optimization,the operation efficiency of the unit in the middle and low load region was improved significantly.
出处
《节能技术》
CAS
2012年第6期524-526,536,共4页
Energy Conservation Technology
关键词
喷嘴组
有效焓降
低负荷
循环效率
nozzle group
effective enthalpy drop
low load
thermal cycle efficiency
