FBC中含S和Cl煤燃烧下的碳钢退化研究

DEGRADATION OF A CARBON STEEL IN A FBC SYSTEM FIRING COALS CONTAINING SULFUR AND CHLORINE

在实验室规模的流化床 (FBC)中分别燃烧低S(0 97mass% )与低Cl(0 0 2 6mass% ) ,中S(1 6 8mass% )与高Cl(0 4 2mass % ) ,高S(4 4 8mass% )与高Cl(0 4 1mass% )三种煤各 10 0 0小时后 ,对放置于接近沸腾床位置的A2 10 -C碳钢管的退化情况进行了研究 .结果表明 ,(1)碳钢退化明显受温度影响 ,随表面温度的升高显著加快 ;(2 )碳钢退化明显受飞行粒子带来的冲蚀影响 ;(3)燃烧低S低Cl煤对碳钢的耗损影响最小 ,而燃烧高S高Cl煤对碳钢耗损影响最大 .同时根据对腐蚀产物的观测分析 。

Degradation of A210 C carbon steel was investigated after 1000 h exposure under a laboratory-scale fluidized-bed combustor (FBC) firing three different coals respectively:low S (0.97 mass%) and C (0.026 mass %) coal,low S (1.68 mass %) and high Cl (0.42 mass %) coal,and high S (4.48 mass %) and CI (0.41 mass%) coal.There were several observations:(1) Degradation is strongly temperature dependent,which significantly increases with increase of the surface temperature of the metal,(2) erosion induced by flying particles makes a great contribution to metal recession,(3) the environment by firing the low S and low Cl coal is the slightest aggressive,while the one firing the high S and high Cl coal is the most corrosive.Morphological evidences obtained in the work are helpful to interpret the effect of the coal-fired atmospheres on the recession of the carbon steel.