Effect of Wall Temperature on Ash Deposition in an Entrained-bed Gasifier.
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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 (T<SUB>W</SUB>) control device. The ash melting temperature (T<SUB>M</SUB>) and the sintering temperature (T<SUB>S</SUB>) seemed to influence the adhesive force and deposit form considerably. When T<SUB>W</SUB> was below T<SUB>S</SUB>, the deposit was a "powder-ash". Between T<SUB>M</SUB> and T<SUB>S</SUB>, the deposit was a "sintered-ash". Near T<SUB>M</SUB>, a "solid slag" was formed. The wall temperature also affected the detachment behavior between the wall and deposit. The sticking temperature (T<SUB>ST</SUB>) was below T<SUB>S</SUB> and the deposit could be detached by gravity from the wall when T<SUB>W</SUB> was below T<SUB>ST</SUB>.<BR>Experiments indicated wall cooling may significantly reduce both particle-wall and particle-particle adhesive forces.<BR>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".
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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