Pyrolysis of wood pellets in the presence of oxygen carriers in a fluidised bed coupled with a DBD reactor for tar quantification
Pyrolysis of wood pellets in the presence of oxygen carriers in a fluidised bed coupled with a DBD reactor for tar quantification
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DOI：
10.1016/j.cej.2018.08.090
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发表时间：
2019
影响因子：
15.1
通讯作者：
Yaoyao Zheng;R. Grant;Wenting Hu;S. Scott
中科院分区：
文献类型：
--
作者：
Yaoyao Zheng;R. Grant;Wenting Hu;S. Scott
在773 ~ 1173 K温度范围内，研究了Fe 2 O3、钙铝石负载CuO和钙铝石负载Cu 2 O化学链剂存在下木材的热裂解行为。一个连续的焦油定量系统，基于流化床下游的DBD反应器，被开发，以允许量化的焦油形成。使用含氧等离子体将挥发物和焦油转化为可测量的含碳物质，主要是CO、CH 4和CO2。结果表明，氧化铝砂中木材热解的主要产物为CH 4、CO、CO2、焦油和焦炭。焦油裂解观察到高于1073 K，这主要产生CH 4。Fe 2 O3和钙铝石负载的Cu基氧化物在873 K以上的温度下对热解产物，特别是焦油的原位燃烧都是有效的。镁铝石负载的CuO表现出最高的反应活性。结果表明，使用金属氧化物直接燃烧生物质，特别是在脱挥发分过程中转化焦油产品的潜力。在这些实验中，与Fe 2 O3和Cu 2 O相比，钙铝石负载的CuO的更好的活性主要是由于CuO在高温下释放气态氧的能力。
The pyrolysis of wood in the presence of chemical looping agents including Fe2O3, mayenite-supported CuO and mayenite-supported Cu2O was studied from 773 to 1173 K. A continuous tar quantification system, based on a DBD reactor downstream of the fluidised bed, was developed to allow quantification of the tar formed. An oxygen-containing plasma was used to convert volatiles and tars to measurable carbon-containing species, mainly CO, CH4, and CO2. It was found that pyrolysis of the wood in alumina sand produced CH4, CO, CO2, tar and char as the main products. Tar cracking was observed above 1073 K, and this mainly generated CH4. Both Fe2O3and mayenite-supported Cu-based oxides were effective forin situcombustion of the pyrolysis products, particularly tar, at temperatures exceeding 873 K. Mayenite-supported CuO showed the highest reactivity. The results showed the potential of using metal oxides for direct combustion of biomass, and particularly converting the tarry products during devolatisation. The better activity of mayenite-supported CuO compared to Fe2O3and Cu2O in these experiments was mainly due to the ability of CuO to release gaseous oxygen at high temperatures.