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首页> 外文会议>International Chemical Recovery Conference v.1; 20040606-20040610; Charleston,SC; US >Direct Causticization For Low And High Temperature Black Liquor Gasification
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Direct Causticization For Low And High Temperature Black Liquor Gasification

机译：直接苛化用于低温和高温黑液气化

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摘要

In order for both low and high temperature black liquor gasification technologies to become economically viable alternatives to the conventional recovery cycle, issues relating to causticization must be addressed. Direct causticizing processes, which involve adding a chemical agent to the black liquor that reacts preferentially with the sodium in the gasifier to form a salt and thus allow the carbon to be released as CO_2, offers a potential solution to this problem. Experiments on thermochemical conversion of black liquor in the presence of sodium tri-titanate or Mn_3O_4 were carried out in a pressurized, entrained-flow reactor simulating high temperature gasification conditions and in a fixed bed reactor simulating low temperature gasification. The experimental results showed that a degree of decarbonization up to 65% was obtained for titanate direct causticization during the studied low and high temperature gasification conditions. The experimental results for Mn_3O_4 direct causticization showed that this system is not possible in combination with high temperature black liquor gasification, since no carbonate conversion was obtained in these experiments. For the low temperature gasification of Mn_3O_4 doped black liquor a degree of decarbonization of 45% was obtained.
机译：为了使低温黑液气化技术和高温黑液气化技术都成为常规回收周期的经济可行替代方案，必须解决与苛化有关的问题。直接苛化工艺包括为黑液添加化学剂，该化学剂优先与气化炉中的钠反应形成盐，从而使碳以CO_2的形式释放，这为解决该问题提供了一种可能的解决方案。在三钛酸钠或Mn_3O_4存在下黑液的热化学转化实验在模拟高温气化条件的加压气流床反应器中和在模拟低温气化条件的固定床反应器中进行。实验结果表明，在所研究的低温和高温气化条件下，钛酸酯直接苛化可获得高达65％的脱碳率。 Mn_3O_4直接苛化的实验结果表明，该系统无法与高温黑液气化结合使用，因为在这些实验中均未获得碳酸盐转化率。对于Mn_3O_4掺杂黑液的低温气化，脱碳度为45％。

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