Abstract
In this paper, effect of gasification temperature and residence time on gasification characteristics of typical pulverized coals under atmosphere pressure were studied on a one-dimensional electric heating drop tube furnace system to evaluate gasification characteristics of pulverized coal at medium temperature. The results show that the gasification rate increases with the raising of the gasification temperature under the temperature among 1150℃and1450℃, and as the temperature is above1350℃, the increasing rate become slower. Cold gas efficiency and carbon conversion meet the maximum value when the temperature approaches the ash fusion point of coal. With the further rise of the temperature, ash on the surface of the char starts to be melted, the gasification reaction rate decreases, due to the hindrance of the effective contact between coal char and gasification agent. The gasification efficiency would become steady when the residence time exceeds 8s.
Highlights
Issues on natural resource and environment become increasingly severely in China, due to the long-term use of traditional coal combustion
Effect of gasification temperature and residence time on gasification characteristics of typical pulverized coals under atmosphere pressure were studied on a one-dimensional electric heating drop tube furnace system to evaluate gasification characteristics of pulverized coal at medium temperature
The results show that the gasification rate increases with the raising of the gasification temperature under the temperature among 1150°C and 1450°C, and as the temperature is above 1350°C, the increasing rate become slower
Summary
Issues on natural resource and environment become increasingly severely in China, due to the long-term use of traditional coal combustion. Integrated gasification combined cycle (IGCC) takes advantage on high efficient and environmentally-friendly, is a new power generation technology. Gasified is one of the key devices of IGCC power generation system. Compared to the other gasification technologies, entrained flow gasification technology get rapid development for its advantages of high gasification intensity, high carbon conversion and be practiced on a large scale. Influencing factors on gasification efficiency of entrained flow gasified are many, effect of gasification temperature and residence time on gasification characteristics of typical pulverized coals were studied on a one-dimensional electric heating drop tube furnace system under the conditions of atmosphere pressure and medium temperature from 1150°C to 1450°C[1,2,3]
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