Combustion Performance Analysis of a New Type 600 MW Lignite-Fired Wall Tangential Boiler
This paper aims to investigate the causes of problems such as slagging on water walls and tube failure due to overheating in the actual operation of a 600 MW supercritical lig-nite-fired wall-tangential boiler.The author conducts cold and hot-state numerical simula-tions and validates the simulation results through on-site parameter testing and system opti-mization adjustments.The results show persistent differences in velocity and temperature imbalance between the left and right sides of the furnace outlet.Feeding and cutting off SO-FA significantly affects the air velocity distribution,thus effectively reducing residual swirl.Computer numerical simulations and on-site parameter testing reveal the existence of a large-diameter and stable rotating"high-temperature fire ring"inside the furnace.It facilitates the ignition of high-moisture lignite and improves combustion stability,but the high primary air ratio along with the large diameter cause slagging and local overheating,thus imperiling the safe and stable operation of the unit.The results and methods of this paper provide a refer-ence for optimal design and operation of similar boilers and offer new ideas for the efficient utilization of high-moisture lignite,which has low heat value and tends to cause slagging.
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