气相温度脉动对煤粉颗粒热解氮化合物释放的影响

Influence of Gas-phase Temperature Fluctuations on the Release of Nitrogen Compound in the Pyrolysis of Pulverized Coal Particles

在有气相温度脉动的条件下,对煤粉颗粒热解中含氮化合物的瞬时释放过程进行了计算,计算中对氮化合物瞬时释放速率采用了官能团(FG-DVC)模型。结果表明,在不同的气相平均温度下,不同粒径煤粉颗粒氮化合物即HCN的释放均受到气相温度脉动的影响。与不考虑气相温度脉动相比,气相温度脉动加快了煤粉颗粒HCN的释放。随着气相温度脉动强度的提高,这种加快作用进一步增大。

In the presence of gas-phase temperature fluctuations,the transient release process of nitrogenous compound resulting from the pyrolysis of pulverized coal particles was calculated.A functional group (FG-DVC) model was adopted for calculating the transient release rate of nitrogen compound.It has been found that at various time-averaged gas-phase temperatures,the release of pulverized-coal particle nitrogen compound (HCN) in a variety of particle diameters is all influenced by the gas-phase temperature fluctuations.Compared with the case when gas-phase temperature fluctuations have not been taken into account,the release of pulverized coal particle HCN is quickened by such fluctuations.With an increase of the gas-phase temperature fluctuation intensity,the quickening action will be further enhanced.