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A salt-induced mechanism for the swelling of black liquor droplet during devolatilization

机译：脱挥发分过程中盐引起黑液液滴溶胀的机制

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摘要

Black liquor (BL) from the pulp and paper industry is a significant bioenergy source. Swelling of BL droplet during the pyrolysis stage of combustion and gasification is a profound phenomenon affecting various boiler processes. However, the mechanism for droplet swelling has remains a puzzle due to an insufficient understanding of the formation of the plastic droplet at the pyrolysis stage of the thermal conversion. Thermogravimetric studies with model aliphatic carboxylates unraveled the melting and decomposition behavior of the complex mixture of BL salts during pyrolysis, indicating that the melting of salts forming a liquid state may be the primary cause for the development of a plastic droplet, which is confirmed by the significant swelling of the salt-polymer mixtures pyrolyzed at 500 degrees C. It is revealed that the consecutive and concurrent melting of an array of aliphatic carboxylates and NaOH over a temperature range of 230-500 degrees C brings about a plastic droplet, while lignin forms carbon materials ideal for building a rigid char surface. Both lignin and aliphatic carboxylates are major sources of volatiles providing the momentum for swelling. In conclusion, three basic aspects account for the swelling of BL droplet: the creation of a plastic state, the production of volatiles, and the formation of a rigid char surface. (C) 2017 Elsevier Ltd. All rights reserved.
机译：制浆造纸行业的黑液（BL）是重要的生物能源。 BL液滴在燃烧和气化的热解阶段膨胀是一种影响各种锅炉过程的深刻现象。然而，由于对热转化的热解阶段中的塑料液滴的形成的了解不足，液滴溶胀的机理仍然是一个难题。用模型脂族羧酸盐进行的热重分析揭示了热解过程中BL盐复杂混合物的熔融和分解行为，表明形成液态的盐的熔融可能是形成塑料液滴的主要原因，这一点已得到证实。在500摄氏度下热解的盐-聚合物混合物显着溶胀。据揭示，一系列脂肪族羧酸盐和NaOH在230-500摄氏度的温度范围内连续且同时熔融会产生塑料滴，而木质素形成碳材料是构建刚性炭表面的理想选择。木质素和脂肪族羧酸盐都是挥发物的主要来源，它们提供了膨胀的动力。总之，BL液滴膨胀的三个基本方面是：塑性状态的产生，挥发物的产生以及刚性炭表面的形成。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2017年第15期|338-344|共7页
  • 作者

    Chen Chengcong; Alen Raimo; Lehtimaki Esa; Louhelainen Jarmo;

  • 作者单位

    Univ Jyvaskyla, Dept Chem, Lab Appl Chem, POB 35, FI-40014 Jyvaskyla, Finland;

    Univ Jyvaskyla, Dept Chem, Lab Appl Chem, POB 35, FI-40014 Jyvaskyla, Finland;

    Univ Jyvaskyla, Dept Chem, Lab Inorgan & Analyt Chem, POB 35, FI-40014 Jyvaskyla, Finland;

    Univ Jyvaskyla, Dept Chem, Lab Appl Chem, POB 35, FI-40014 Jyvaskyla, Finland;

  • 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

    Combustion; Black liquor; Swelling; Mechanism; Aliphatic carboxylates; Lignin;

    机译：燃烧;黑液;溶胀;机理;脂肪族羧酸盐;木质素;

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