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Entrained flow gasification of biocoal from hydrothermal carbonization

机译：水热碳化法对生物煤进行气流床气化

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摘要

Hydrothermal carbonization (HTC) converts biomass into a coal-like substance, here referred to as biocoal. Beech wood chips are treated hydrothermally at 210℃ for 3 h in a 250 L pilot scale reactor. The carbon content (daf) thereby increases from 48 wt.% to 57 wt.% and the volatile matter (wf) decreases from 79 wt.% to 69 wt.%. The carbon and energy yields are both 80% on a mass and HHV basis, respectively, with the major loss being solubilized substances. Pulverization of biocoal is found to be much less energy intensive compared to wood. Moreover, pulverized particles show a spherical shape which may facilitate fluidization.Gasification experiments are carried out at temperatures of 1000℃, 1200℃ and 1400℃ at atmospheric pressure in a laboratory scale entrained flow reactor. The standard particle diameter used in the experiments is 80-160 urn. During each experiment char samples are collected and the synthesis gas concentration is measured. Carbon conversion at a residence time of 1.0 s is 84%, at both 1000℃ and 1200℃ A significant increase in carbon conversion to 88% at 1400℃ is observed. Comparable gasification experiments are carried out with lignite as the fuel. Rhenish lignite is gasified using the same stoichiometry and particle size. The conversion of lignite is slightly lower indicating the high reactivity of biocoal.An increase of particle size would be beneficial due to the lower power consumption for pulverization. In experiments with biocoal at a particle size of 160-250 urn, a slightly lower conversion is measured due to internal and external mass transfer limitations at the particles. The high conversion at short reaction times indicates a high reactivity of biocoal under entrained flow gasification conditions.
机译：水热碳化（HTC）将生物质转化为煤样物质，此处称为生物煤。将山毛榉木屑在250升中试规模反应器中于210℃水热处理3小时。碳含量（daf）由此从48重量％增加到57重量％，并且挥发性物质（wf）从79重量％减少到69重量％。以质量和HHV计，碳和能量的收率分别为80％，主要损失是可溶物质。与木材相比，发现粉煤的能耗低得多。此外，粉碎后的颗粒呈球形，有利于流化。在实验室规模的气流床中，在大气压下于1000℃，1200℃和1400℃的温度下进行了气化实验。实验中使用的标准粒径为80-160微米。在每个实验期间，收集炭样品并测量合成气浓度。在1000℃和1200℃下，停留时间为1.0 s的碳转化率为84％，在1400℃时，碳转化率显着增加至88％。以褐煤为燃料进行了可比的气化实验。用相同的化学计量和粒径将重质褐煤气化。褐煤的转化率略低，表明生物煤具有较高的反应活性。由于降低了粉煤的能耗，因此增大粒径将是有益的。在使用粒径为160-250微米的生物煤进行的实验中，由于颗粒内部和外部的传质限制，测得的转化率略低。在短反应时间下的高转化率表明，在气流床气化条件下，生物煤的反应性很高。

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  • 来源
    《Fuel》 |2012年第2012期|p.396-403|共8页
  • 作者

    Alexander Tremel; Jan Stemann; Michael Herrmann; Berit Erlach; Hartmut Spliethoff;

  • 作者单位

    Institute for Energy Systems, Technische Universitaet Muenchen, Boltzmannstrasse 15, 85748 Garching, Germany;

    Institute for Energy Engineering, Technische Universitaet Berlin, Marchstrasse 18, 70587 Berlin, Germany;

    Institute for Energy Systems, Technische Universitaet Muenchen, Boltzmannstrasse 15, 85748 Garching, Germany;

    Institute for Energy Engineering, Technische Universitaet Berlin, Marchstrasse 18, 70587 Berlin, Germany;

    Institute for Energy Systems, Technische Universitaet Muenchen, Boltzmannstrasse 15, 85748 Garching, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    entrained flow gasification; hydrothermal carbonization; biocoal; pulverization; rhenish lignite;

    机译：气流床气化;水热碳化生物煤粉碎菱镁矿;

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