Lignite-char gasification mechanism in mixed atmospheres of steam and CO2 at different pressures
Lignite-char gasification mechanism in mixed atmospheres of steam and CO2 at different pressures
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DOI：
10.1016/j.fuproc.2015.06.035
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发表时间：
2015-10
影响因子：
7.5
通讯作者：
Fenghai Li;Q. Yan;Jiejie Huang;Jiantao Zhao;Yitian Fang;Jianfei Wang
中科院分区：
文献类型：
--
作者：
Fenghai Li;Q. Yan;Jiejie Huang;Jiantao Zhao;Yitian Fang;Jianfei Wang
研究了褐煤焦与水蒸汽、CO2及其混合物在加压固定床（PFB）反应器中在不同压力（0.10~2.0MPa，N2为稀气体）下的气化特性。结果表明，蒸汽和CO2混合物中的焦炭气化机理与两种反应气体的相对分压有关。焦炭气化过程中存在一个蒸汽分压拐点，当蒸汽分压低于该值时，焦炭气化率随着CO2分压的增加先增大后下降；而当蒸汽分压高于该值时，CO2分压增加，导致焦炭气化率下降。水蒸气与CO2混合气中褐煤-焦气化反应机理与总压力密切相关：较低压力下，与单独反应位点反应机理一致；而在较高压力下，它接近常见的反应位点反应机制。
Gasification characteristics of lignite-char with steam, CO2and their mixture in a pressurized fixed bed (PFB) reactor were investigated at different pressures (0.10 ~ 2.0 MPa, N2as dilute gas). The results show that char-gasification mechanism in the mixture of steam and CO2are connected with relative partial pressures of two reactant gases. A turning value of steam partial pressure is found in char gasification, when the steam partial pressure is lower than the value, the char gasification rate firstly increase and then drops with CO2partial pressure increase; whereas, when the steam partial pressure is higher than the value, the increase of CO2partial pressure results in char gasification rate decrease. The reaction mechanism of lignite-char gasification in the mixture of steam and CO2is closely related to the total pressure: under lower pressures, it is consistent with the separate reactive site reaction mechanism; while under higher pressures, it approaches to the common reactive site reaction mechanism.