Entrained-flow gasification technology is considered as the most promising gasification technology because of its clean and efficient utilization characteristics. The stable fluidity of slag at high temperature is the key to affect the long-period operation of gasifier. The diversity and difference of coal ash-slag systems are difficult to meet the requirements for stable slagging in entrained-flow gasifiers. Therefore, coal blending or adding fluxes have been used in industry for a long time to improve the flow behavior of coal ash. In essence, the coal ash flow behavior is controlled by changing the chemical composition of feedstock coal ash. As a by-product of indirect coal liquefaction process, indirect coal liquefaction residue (ICLR) is a kind of industrial solid waste, which is usually disposed of by stacking or landfilling. However, this disposal method will not only occupy land resources, but also cause serious pollution to soil and water bodies by leachate containing toxic and harmful metals. As a carbon containing matrix, ICLR is not only a kind of waste, but also a kind of energy substance. Utilizing existing industrial gasifier to blend combustion ICLR can not only transform industrial solid waste into fuel, but also save coal resources. Moreover, the ICLR usually contains unique ash chemical composition different from coal, which will affect the slagging performance of the gasifier. Therefore, exploring the effect of the ash addition in ICLR on the coal ash flow behavior can not only improve the slagging performance and gasification efficiency of entrained-flow gasifier by using the unique ash chemical composition of ICLR, but also provide some theoretical support for the large-scale consumption of industrial solid waste.
 

Entrained-flow gasification,Ash slag,Slag structure,Melting characteristics,Viscosity-temperature characteristics