Adaptability Of A 1900t/h Boiler For Switching To Designed Coal

Operating characteristics of the boiler is directly affected by coal characteristics. Since the original designed coal has been exhausted for a1900t/h supercritical boiler, characteristics of different common coal need for analysis, and put forward appropriate designed coal of the unit. Some issues such as falling coal char frequently, high exhaust gas temperature, low reheat steam temperature, low boiler efficiency, high carbon content of fly ash and bottom slag carbon content in boiler operation are solved through the boiler operation optimization and combustion adjustment test. And find the optimal control law under various load, basis and guidance of the unit safe operation and economic operation are provided.In this paper, experiments of daily coal quality characteristics are tested, elemental analysis, industrial analysis, heat analysis, HGI test, ash melting point test and ash composition analysis of single coal are carried out. On this basis, ignition performance, burnin performance and slagging properties of mixed coal at different blending proportions are analyzed, and finally switching to designed coal composed of 60% Jinjie coal+40% Gengcun coal is determined. The adaptability of combustion system, soot blowing system, wind and smoke systems and milling system for mixed coal are studied for the switched designed coal and combined with the characteristics of boiler equipment. The switched designed coal adapt to each boiler system through the appropriate operation adjustment.Analysis of boiler performance under different oxygen and grinding combinations are carried out for the switched designed coal out of the boiler performance test and optimal conditions experiment. Boiler efficiency increased from 93.02% to 93.73%, and increased by about 0.7 percentage points through system optimization, and boiler efficiency can fully meet the design requirements. Therefore, the changing coal work completely succeed.