采用数值模拟软测量技术，在保证锅炉燃烧稳定和炉内温度较高水平的条件下，预测300 MW等级锅炉在实际运行中可降低到25%负荷稳定燃烧，并经过现场低负荷稳燃实验对结果进行验证。针对一次风速调整、磨煤机投运方式调整和配风方式及运行氧量调整三种方式对低负荷稳燃能力的影响进行分析，结果表明：在降负荷过程中调平一次风速偏差并适当降低一次风速，投运相邻层燃烧器，关小周界风，适当降低二次风量的同时适当降低运行氧量有利于提高低负荷稳燃特性。

Numerical simulation technology was used to predict the lowest load with stable combustion that the 300 MW grad boiler can be reduced to in actual operation which is 25%.Under this load,the combustion stability of the boiler and the high temperature level in the furnace can be guaranteed.And the results were verified by the experiments of the low load condition with stable combustion.The effects of primary air speed adjustment,coal mill operation mode adjustment,second air distribution and operation oxygen content adjustment on low load stable combustion capability are discussed.The results show that: during the load reduction,it is beneficial to improve the low load stable combustion ability by leveling deviation of primary air velocity,reducing the primary air velocity appropriately,commissioning adjacent burners,closing the perimeter air,and reducing the operating oxygen volume,while reducing the secondary air volume.

TM621.2

内蒙古电力公司2017年第二批科技计划（重点）项目（源网综合协调控制及火电机组深度调峰技术研究，2017-02-01）