发电技术 ›› 2022, Vol. 43 ›› Issue (6): 970-976.DOI: 10.12096/j.2096-4528.pgt.22080

• 发电及环境保护 • 上一篇    

调峰机制下供热汽轮机中压调门调节特性试验研究

王志云1, 赵玉柱2, 王学栋2, 张元舒2   

  1. 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
  • 收稿日期:2022-04-20 出版日期:2022-12-31 发布日期:2023-01-03
  • 作者简介:王志云(1970),男,高级工程师,主要从事电站设计工作,hdnmg2005@126.com
    赵玉柱(1981),男,正高级工程师,主要从事汽轮机、燃气轮机运维服务及监测诊断技术研究工作;
    王学栋(1966),男,正高级工程师,主要从事汽轮机节能诊断、节能改造及节能技术研究工作,本文通信作者,xuedong-wang@chder.com
    张元舒(1987),男,高级工程师,主要从事火电厂汽轮机本体和辅机性能测试、经济指标分析、运行策略优化和节能技改方案研究等工作。

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

Zhiyun WANG1, Yuzhu ZHAO2, Xuedong WANG2, Yuanshu ZHANG2   

  1. 1.Baotou Donghua Thermal Power Co. , Ltd. , Baotou 014000, Inner Mongolia Autonomous Region, China
    2.Huadian Electric Power Research Institute Co. , Ltd. , Hangzhou 310030, Zhejiang Province, China
  • Received:2022-04-20 Published:2022-12-31 Online:2023-01-03

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。

关键词: 热电联产机组, 供热改造, 汽轮机, 中压调门, 调节特性

Abstract:

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.

Key words: combined heat and power units, heating retrofit, steam turbine, intermediate pressure cylinder regulating valve, regulation characteristics

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