Journal of the Japan Institute of Energy
Online ISSN : 1882-6121
Print ISSN : 0916-8753
ISSN-L : 0916-8753
Effect of Wall Temperature on Ash Deposition in an Entrained-bed Gasifier
Shuntaro KOYAMAShinji TANAKAAkio UEDANobuo YOSHIDA
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1995 Volume 74 Issue 4 Pages 221-227

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Abstract

The adhesion and the deposition behavior of coal ash on an entrained-bed gasifier wall were studied with a laboratory scale apparatus equipped with a wall temperature (TW) control device. The ash melting temperature (TM) and the sintering temperature (TS) seemed to influence the adhesive force and deposit form considerably. When TW was below TS, the deposit was a “powder-ash”. Between TM and TS, the deposit was a “sintered-ash”. Near TM, a “solid slag” was formed. The wall temperature also affected the detachment behavior between the wall and deposit. The sticking temperature (TST) was below TS and the deposit could be detached by gravity from the wall when TW was below TST.
Experiments indicated wall cooling may significantly reduce both particle-wall and particle-particle adhesive forces.
A modest numerical simulation model for ash growth was developed. When grow-ing the deposits formed triple layers, powder-ash / sintered-ash / slag. Easy removal, such as by a soot blower, is possible by not allowing the deposit to become “sintered-ash”.

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