Operational optimization on fully burning and high proportion blend burning high-alkali coal in boiler with slag-tap furnace
In order to understand the key parameters and operating experience on fully burning and high proportion blend burning high-alkali coal in boiler with slag-tap furnace,long-term engineering tests were conducted based on a 300 MW boiler with slag-tap furnace in a power plant.An analysis was conducted on the possible combustion organization,nitrogen oxide control,slag flow,and ash deposition issues.Modifications were made to the combustion system,thermal modification system,and slag flow system.So long-term operational data and key parameter records were conducted,after fully burning and high proportion blending burning of 300 000 tons of high-alkali coal,all operating parameters of the boiler were normal.Based on recent operations and comprehensive tests,the optimized boiler with slag-tap furnace in a specific power plant demonstrates strong adaptability to high-alkali coal.Within the control range of coal ash components with w(Al2O3)＜25％,w(Fe2O3)＜15％,12％＜w(CaO)＜30％,silica-alumina ratio＞1.7,acid/alkali ratio＞0.5,the normal operation of the boiler can be ensured without obvious ash deposition.Burning high-alkali coal can effectively reduce the inlet flue gas temperature of the first-level heating surface to below the design value,effectively avoiding the occurrence of slagging on the first-level heating surface of the boiler,and the generation of nitrogen oxides is also reduced by more than 30％compared with using the original design coal.
high-alkali coalboiler with slag-tap furnaceoperational optimizationcontaminationslagging
国家科技期刊平台
NSTL
万方数据
维普
