Fundamentals on Combustion and Gasification Behavior of Coal Particle Trapped on Molten Slag Layer

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Ichiro Naruse¹  Reiji Noda¹  Kazutomo Ohtake¹ 

[1] Department of Ecological Engineering, Toyohashi University of Technology

关键词: Coal Combustion;    Coal Gasification;    Deconvolution;    Molten;    Slag Layer;    Temperature Measurement;   

DOI  :  10.1252/jcej.29.235

来源: Maruzen Company Ltd

【 摘 要 】

References(15)Cited-By(4)In order to develop a slagging coal gasifier and an Integral Gasification Combined Cycle (IGCC), fundamental behavior of combustion/gasification of a coal particle trapped on the molten slag layer was studied by using a laboratory scale batch reactor. Air and CO2 were used as reactants to burn and gasify the coal particle, respectively. The experiments were carried out by dropping a single coal particle onto the molten slag layer. The producted gas concentrations and the surface temperatures of coal particle and slag layer were continuously measured by gas analyzers and a two-dimensional two-color pyrometer, respectively. The indicated results by the analyzers were deconvoluted to evaluate the true time history of concentration change since the changing rate of concentration corresponded to the time delay of the analyzers comparably. In order to observe the change of particle structure, the reacting particle was quenched by injecting N2 gas. After that, the surface and internal structures were observed by an SEM and an optical microscope, respectively.As a result, the accuracy of adopted temperature measuring method was found to be within ±40 K. Under the combustion condition the particle temperature of coal exceeded that of the slag layer. Under the gasification condition, on the other hand, the reverse tendency was observed. The molten slag layer decelerated the reaction rate, especially under the gasification condition, since the melting points of ash and coal particle itself fell down due to the reducing condition occurring around/in the coal particle.

【 授权许可】

Unknown