配煤对煤灰熔融温度和黏温特性的影响OA

To address the mismatch between the melting temperature(tm)and viscosity(η)of coal ash in the Yulin area and the requirements of gasification process,coal blending was conducted using six types of local coal(Jinjitan slack coal and five cleaned coals)to study the effect of coal blending on tm and η.The results indi-cate that with an increase in the mass of cleaned coal(m)blended,the tm and η of coal ash slag exhibit a nonlin-ear decreasing trend.FactSage simulation results show that as the mass fraction of alkaline components(wa)in the coal ash slag increases,the amount of low-melting-point minerals(such as CaAl2Si2O8)increases,leading to a decrease in the tm of coal ash slag.Although J8H2 coal ash exhibits a glassy slag state,its η is relatively high,which can easily lead to slagging in the gasifier.With an increase in the mass of blended cleaned coal(m),the coal ash slag shows a crystalline slag state,but the temperature range corresponding to η=2.5-25.0 Pa·s is expanded,which is beneficial for the stable operation of the gasifier.The calculation results of non-bridging oxygen bonds and bridging oxygen bonds(nNBO/nBO)show that an increase in the mass of blended cleaned coal(m)reduces the stability of the silicate network structure of coal ash slag,resulting in a decrease in η.Coal blending effectively regulates the tm and η of Yulin coal,providing a theoretical basis for its efficient utili-zation in gasifiers.