调峰机制下供热汽轮机中压调门调节特性试验研究  

Experimental Study on Regulation Characteristics of Intermediate Pressure Cylinder Regulating Valves of Heat Supply Steam Turbine Under Peak Regulating Mechanism

作　　者：王志云 赵玉柱 王学栋 张元舒 WANG Zhiyun;ZHAO Yuzhu;WANG Xuedong;ZHANG Yuanshu(Baotou Donghua Thermal Power Co.,Ltd.,Baotou 014000,Inner Mongolia Autonomous Region,China;Huadian Electric Power Research Institute Co.,Ltd.,Hangzhou 310030,Zhejiang Province,China)

机构地区：[1]包头东华热电有限公司,内蒙古自治区包头市014000 [2]华电电力科学研究院有限公司,浙江省杭州市310030

出　　处：《发电技术》2022年第6期970-976,共7页Power Generation Technology

摘　　要：为适应调峰要求,汽轮机组发电负荷变化幅度较大,从再热蒸汽管道抽汽供热的参数也大幅波动,汽轮机中压调门参与调节以稳定供热参数。对于一台采用此方式供热的300 MW等级汽轮机组,在电负荷250 MW、供热抽汽量52.20~53.94 t/h条件下,通过试验研究了中压调门的调节特性。结果表明:随着中压调门开度的减小,中压缸进汽流量逐渐降低,再热蒸汽压力逐渐升高,当中压调门最小开度为24.97%时,中压缸进汽压力为3.44 MPa,供热抽汽母管压力为3.13 MPa;高压缸压比随中压调门开度的减小而减小,其最大值为3.13,最小值为2.65;高压缸排汽温度随中压调门开度的减小而升高,其最高值为331.76℃,最低值为312.97℃;随着中压调门开度的减小,中压缸效率逐渐降低,从93.37%降至84.78%;随着中压调门开度的减小,高压缸和中压缸蒸汽焓降变化不大,但一段抽汽压力和高压缸排汽压力增加,高、中压缸通流量降低,高、中压缸做功量减小,导致机组电负荷降低9.79 MW;机组轴系安全运行指标保持稳定。In order to meet the requirements of peak regulation,the power load of the steam turbine unit changes greatly.The heating parameters of the steam extraction from the reheated steam pipe also fluctuate greatly.The intermediate pressure(IP)cylinder regulating valves of the steam turbine participate in the regulation to stabilize the heating parameters.For a 300 MW steam turbine adopting such heating mode,the regulation characteristics of the IP cylinder regulating valves was studied experimentally under power load of 250 MW and extraction steam flow of 52.20-53.94 t/h.The results show that,as the opening of regulating valves decreases,the inlet steam flow of the IP cylinder decreases gradually,and reheated steam pressure increases gradually.When the minimum opening of the IP cylinder regulating valves is 24.97%,the inlet steam pressure of the IP cylinder is 3.44 MPa,and pressure of the main extraction steam pipe is 3.13 MPa.The maximum pressure ratio of the high pressure(HP)cylinder is 3.13 and the minimum value is 2.65,decreasing gradually.The exhausting steam temperature of the HP cylinder increases gradually,the highest is 331.76℃,the lowest is 312.97℃.The efficiency of the IP cylinder is gradually reduced,from 93.37%to 84.78%.The steam enthalpy drops of the HP cylinder and the IP cylinder do not change a lot.However,the first stage extraction steam pressure and the HP cylinder exhausting steam pressure increase.The flow rate of the HP and IP cylinders is reduced,and the work capacity of the HP and IP cylinders is reduced,resulting in the decrease of power load of 9.79 MW.The safety operation index of the unit shaft system remains stable.

关 键 词：热电联产机组 供热改造 汽轮机 中压调门 调节特性 

分 类 号：TK263[动力工程及工程热物理—动力机械及工程]