Experimental Study on Combustion Optimization for 1000MW Ultra-supercritical Boilers

After the comprehensive transformation of combustion system for a 1000MW ultra-supercritical boiler, there are a series of problems such as combustion deviation of left and right sides, high CO content at the outlet of economizer, high carbon content of slag and poor low-nitrogen combustion effect due to unsatisfactory operation adjustment. In order to solve the problem of abnormal combustion, combustion optimization adjustment test was carried out, including oxygen leveling, secondary throttle adjustment, exhaust throttle adjustment, optimal oxygen adjustment. By combustion optimization adjustment test, the economy, safety and environmental protection of the boiler combustion get obvious increase. Oxygen distribution is more uniform along the furnace width direction, and the problems of abnormal combustion are solved significantly. The wall temperature distribution is more uniform along the furnace width, and the wall temperature deviation is decreased obviously. The boiler efficiency under 1000MW condition increased by 0.41 percentage points compared with that before adjustment, reaching the design boiler efficiency under THA condition.