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首页> 外文会议>2004 TAPPI fall technical conference >Economics of Integrating Black Liquor Gasification with Pulping: Part II-Effects of Yield Increases from Modified Pulping with Polysulfide
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Economics of Integrating Black Liquor Gasification with Pulping: Part II-Effects of Yield Increases from Modified Pulping with Polysulfide

机译：黑液气化与制浆一体化的经济学：第二部分-多硫化物改性制浆的产量增加的影响

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Using black liquor gasification (BLG), the recovered entities of sodium and sulfur can be split into two separate fractions with varying degrees of separation dependent on the operating conditions and the technology used. The separation of these chemicals creates some opportunities in the pulping process where chemical profiling may be employed to increase the pulp yield or to extend delignification. This benefit may be offset by an increase in the causticizing load. Of the various pulping options with black liquor gasification, sulfur profiling would be the lowest capital cost process to implement, especially for mills with a modified continuous or batch process. Previous process simulation work has showed that BLG implementation alone would likely increase the cost of pulping operations due to the higher costs associated with limekiln operation. However, it was also found that by combining BLG implementation with pulping process modifications like split sulfidity pulping, green liquor pretreatment or polysulfide addition, the overall operational costs associated with pulping and chemical recovery could be substantially decreased. The work described here further explores the previous results; incorporating experimental data obtained in laboratory pulping operations, as well as the refinement of the BLG and overall process model. In order to enhance the previously used WinGEMS simulation, models for a black liquor gasifier and associated gas clean-up operations were developed and incorporated into the process simulation used for economic analysis. Specific detail was given to the process carbon conversion ratios, the phase separation of sodium and sulfur components and the energy balance around the gasifier model. Comparative analyses were made between a traditional kraft mill simulation using the Tomlinson recovery boiler and the improved model system incorporating the BLG. The analyses were focused on variables affecting the cost of process operation. Results show the potential impact from BLG implementation on Kraft MCC pulping, and the effects on operational cost associated with pulping and chemical recovery.
机译：使用黑液气化（BLG），可以将回收的钠和硫实体分为两个独立的馏分，其分离程度取决于操作条件和所使用的技术。这些化学物质的分离在制浆过程中创造了一些机会，在这种过程中，可以使用化学特征分析来提高纸浆产量或延长脱木质素作用。这种好处可以通过增加苛性化负荷来抵消。在黑液气化的各种制浆选项中，硫剖析将是实施成本最低的过程，特别是对于采用改进的连续或间歇过程的工厂而言。以前的过程模拟工作表明，由于石灰窑运营相关的成本较高，仅实施BLG可能会增加制浆成本。但是，还发现，通过将BLG实施与制浆工艺修改（如分开的硫化制浆，绿液预处理或添加多硫化物）相结合，可以显着降低与制浆和化学回收相关的总体运营成本。这里描述的工作进一步探索了先前的结果；结合在实验室制浆操作中获得的实验数据，以及BLG和整体过程模型的完善。为了增强以前使用的WinGEMS模拟，开发了黑液气化炉和相关的气体净化操作的模型，并将其合并到用于经济分析的过程模拟中。详细介绍了过程碳转化率，钠和硫组分的相分离以及气化炉模型周围的能量平衡。在使用汤姆林森回收锅炉的传统牛皮纸厂模拟与结合了BLG的改进模型系统之间进行了比较分析。分析集中在影响过程操作成本的变量上。结果显示了BLG实施对牛皮纸MCC制浆的潜在影响，以及对与制浆和化学回收相关的运营成本的影响。

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