Experimental Investigation into a Pilot-Scale Entrained-Flow Gasification of Pulverized Coal Using CO2 As Carrier Gas

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• 作者：Xiaolei Guo ; Wenxue Lu ; Zhenghua Dai ; Haifeng Liu ; Xin Gong ; Lei Li ; Honglin Zhang ; Baogui Guo
• 刊名：Energy & Fuels
• 出版年：2012
• 出版时间：February 16, 2012
• 年：2012
• 卷：26
• 期：2
• 页码：1063-1069
• 全文大小：293K
• 年卷期：v.26,no.2(February 16, 2012)
• ISSN：1520-5029

文摘

Using CO₂ as a carrier gas in pneumatic conveying of pulverized coal instead of N₂ has been paid more and more attention with the wide application of dry-feed entrained-flow coal gasification technology due to its attractive effects as a reactant. Accordingly, a pilot-scale performance of entrained-flow gasification using CO₂ as the carrier gas of pulverized coal was investigated at gasifier temperatures between 1300 and 1400 掳C. The differences in solid mass flow rate and flow stability are insignificant in the dense-phase pneumatic conveying between CO₂ and N₂ carrier provided that the conveying pressure differences and solid velocities in the pipeline are kept constant. Regarding syngas composition in dry basis, there was a desired drop in inert gas (N₂) concentration from about 6% to less than 2%, while the CO₂ concentration increased by about 4%age points in optimal operation conditions when CO₂ carrier substituted for N₂. At the same time, gasification profiles in different operation conditions indicated that CO₂ carrier can act as an auxiliary gasification agent. Steam as another important gasification agent, however, cannot be completely substituted by CO₂ carrier gas.