粉尘对高温煤气脱硫反应的影响

EFFECT OF DUST ON HIGH TEMPERATURE GAS DESULFURIZATION

研究了在 4 0 0℃～ 5 5 0℃范围内粉尘对氧化铁高温脱硫剂的硫容和脱硫反应速度的影响。结果表明随着温度的升高 ,粉尘对脱硫剂的硫容和脱硫反应速度的影响增大。并利用收缩核模型计算比较了由于粉尘加入引起的H2 S有效扩散系数的变化 ,发现有效扩散系数由于粉尘的作用 ,随温度升高显著降低。

High temperature gas cleaning is a key technique in advanced coal based power generation systems The effect of deposited dust on iron oxide desulfurization sorbent was systemically evaluated in the temperature range of 400?℃～550?℃ The ratio of effective sulfur capacity of the sorbent without dust and with dust was defined as a factor to measure the effect of dust on the sorbent The results showed that the effect became more serious with the increase of temperature At 550?℃, the factor was 1 5 when 0 5% dust was mixed with sorbent By at 400?℃, even though 5% dust was mixed with sorbent, the factor was about 1 This indicated the effect can be overlooked at 400?℃ Kinetic studies were also performed when dust adhered to the surface of sorbent and the data were correlated using the shrinking core model Deposition of dust on the surface of the sorbent could result in the deterioration of mass transfer and the decrease of the effective diffusivities