摘要
针对某电厂2号机组屏式过热器两侧汽温交叉摆动、高负荷时减温水量大及NOx超标等问题,通过系统性燃烧调整试验与运行数据分析,提出基于总风量-负荷匹配的协同优化控制策略。研究表明,主燃区辅助二次风门开度从15%增至45%,可以使一级减温水总量降低50.0%;周界风开度从10%提升至30%,可以缩小减温水量差异25%,并解决汽温交叉摆动及NO_(x)超标问题;燃烬风门开度从100%降至70%,可改善二级减温水入口汽温交叉现象。经现场试验验证,形成包含风门协同调节及总风量优化的综合解决方案可为同类型机组调整改造提供参考。
Aiming at the problems such as the cross-swing of steam temperature on both sides of the screen superheater of unit 2 of a certain power plant,the large amount of cooling water at high load and the excessive NOx,through systematic combustion adjustment tests and operation data analysis,a collaborative optimization control strategy based on total air volume-load matching is proposed.Research shows that increasing the opening degree of the auxiliary secondary air door in the main combustion zone from 15%to 45%can reduce the total amount of primary desuperheating water by 50.0%.The peripheral wind opening has been increased from 10%to 30%,which can reduce the difference in cooling water volume by 25%and solve the problems of steam temperature cross-swing and NO_(x) over-limit.Reducing the opening degree of the combustion ash damper from 100%to 70%can improve the vapor-temperature crossover phenomenon at the inlet of the secondary desuperheating water.On-site tests have verified that the comprehensive solution formed,which includes the coordinated regulation of dampers and the optimization of total air volume,can provide a reference for the adjustment and transformation of similar units.
出处
《节能》
2025年第8期136-140,共5页
Energy Conservation
关键词
汽温偏差
燃烧调整
二次风
周界风
氮氧化物
汽温控制
steam temperature deviation
combustion adjustment
secondary air
peripheral air
nitrogen oxides
steam temperature control
