Investigation on co-gasification of coal and biomass in Shell gasifier by using a validated gasification model
Investigation on co-gasification of coal and biomass in Shell gasifier by using a validated gasification model
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DOI：
10.1016/j.fuel.2017.01.103
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发表时间：
2017-05
期刊：
影响因子：
7.4
通讯作者：
H. Jeong;In Sik Hwang;Sang Shin Park;Jungho Hwang
中科院分区：
文献类型：
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作者：
H. Jeong;In Sik Hwang;Sang Shin Park;Jungho Hwang
在发电厂中，煤和生物质的共同利用可以通过用生物质的近碳中性燃烧部分取代化石燃料燃烧来减少总体CO2排放。采用经过验证的气化模型，对Shell气化炉中生物质的共气化过程进行了计算流体动力学（CFD）模拟，以考察生物质量对共气化过程的影响。在煤和生物质焦反应的子模型中，使用用户定义的函数考虑孔隙和体积扩散。煤（南非的道格拉斯优质煤）和生物质（韩国的由松树和橡树的锯末处理的木屑）混合比（基于热值）为0.0（煤100%）、0.05、0.1、0.15和0.2。CFD模型的验证使用的整体煤气化联合循环电厂位于西班牙Puertollano的实际运行数据。随着共混比的增加，CO浓度降低，H2浓度增加。冷煤气效率在82.8%和88.1%之间，并且对于所有掺混比，碳转化效率高于99.8%。这些效率与煤气化的效率相似。然而，混合比为0.15和0.2是不合适的共气化，因为这两个混合比计算的出口温度分别为1708和1621 K，其中都低于本研究中使用的煤的临界炉渣粘度温度（1753 K）。
Co-utilization of coal and biomass in a power plant can reduce the overall CO2emission by partly displacing fossil-fuel combustion with near-carbon-neutral combustion of biomass. Computational fluid dynamics (CFD) modeling of co-gasification is conducted using a validated gasification model to examine the effect of biomass amount on the co-gasification process in a Shell gasifier. In the sub-models for coal and biomass char reactions, pore and bulk diffusions are considered using a user-defined function. The coal (Douglas premium coal, South Africa) and biomass (wood pellet treated from sawdust of pine and oak in South Korea) blend ratios (based on calorific value) are 0.0 (coal 100%), 0.05, 0.1, 0.15, and 0.2. The CFD model is validated using the actual operating data of the integrated gasification combined-cycle plant located in Puertollano, Spain. The CO concentration decreases but that of H2increases with increasing blend ratio. The cold gas efficiencies range between 82.8% and 88.1%, and the carbon conversion efficiencies are higher than 99.8% for all blend ratios. These efficiencies are similar to those of coal gasification. However, blend ratios of 0.15 and 0.2 are not appropriate for co-gasification because the exit temperatures calculated for these two blend ratios are 1708 and 1621 K, respectively, in which both are lower than the critical slag viscosity temperature (1753 K) of the coal used in this study.