...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Forests >Sulfur Recovery from Syngas in Pulp Mills with Integrated Black Liquor Gasification
【24h】

Sulfur Recovery from Syngas in Pulp Mills with Integrated Black Liquor Gasification

机译：从合成气中的含硫在纸浆厂中的含硫储存，具有综合黑液气化

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Research Highlights: As to fill the current knowledge gap and to deliver important findings to the scientific community, efficient sulfur recovery from black liquor gasifier syngas, comprising both gas cleaning and returning sulfur to the pulping process, was modeled and assessed from a techno-economic viewpoint. This manuscript proves that the associated investment and operational costs cannot be neglected and that they impact the black liquor gasification feasibility significantly. To prove its gasification as a sustainable and more efficient processing route over its combustion in recovery boilers, a substantial process efficiency improvement and operating costs reduction must be targeted in future research. Background and Objectives: Sulfur compounds found in black liquor partly turn into hydrogen sulfide during gasification and exit the gasifier in the syngas. Their efficient recovery in their sulfidic form to the pulping process is of utmost importance. Current studies focus on black liquor gasifier syngas desulfurization only. Materials and Methods: A mathematical model of two H 2 S absorption units from a 66.7 t DS /h (1600 tons dry solids per day) black liquor gasification process to 20 ppm H 2 S content in cleaned syngas using either white liquor plus NaOH or N-methyldiethanolamine (MDEA) was created using the Aspen Plus simulation software. Results: The results show that CO 2 co-absorption significantly increases the lime kiln load: +20% in the MDEA alternative and +100% in the other one. The MDEA alternative requires almost the same investment costs but by around USD 9.7 million (50%) lower annual operating costs compared to the other one. Economic evaluation was based on the assumed discount rate of 5% and on the expected plant operation time of 25 years. The estimated total investment cost of the whole plant is around USD 170 million for both alternatives. The whole plant including this alternative exhibits a positive net present value (over USD 19 million), an internal rate of return of 5% and a profitability index of 1.12, whereas that with the other alternative is economically infeasible. Conclusions: The MDEA-based syngas cleaning technology represents a more efficient and economically feasible option of sulfur recovery. A major drawback of both modeled syngas cleaning technologies is that their estimated annual operating costs significantly reduce the expected profit margin of gasification over the traditional black liquor combustion in a recovery boiler. Syngas cleaning and sulfur recovery have to be further optimized to reach a significant cut down in operational costs to improve the economic feasibility of black liquor gasification.
机译：研究亮点：为了填补当前的知识差距并向科学界提供重要调查结果，从黑液气化器合成气中的高效硫回收，包括气体清洁和将硫磺向制浆过程进行建模，并从技术经济学中进行建模和评估观点。本手稿证明，没有忽视相关的投资和运营成本，并显着影响黑液气化可行性。为了证明其气化作为在恢复锅炉中燃烧的可持续和更有效的处理路线，必须在未来的研究中实现大量的工艺效率提高和减少运营成本。背景和目的：在黑液中发现的硫化合物在气化过程中部分变成硫化氢，并在合成气中出口气化器。它们以硫酸形式的高效恢复至制浆过程至关重要。目前的研究专注于黑液气化器合成气脱硫。材料与方法：从66.7吨/小时（每天1600吨干固体）的2 H 2 S吸收单元的数学模型（每天1600吨）黑液气化过程在清洁合成气中的20ppm H 2 S含量使用白色白酒加NaOH或使用Aspen Plus仿真软件创建N-甲基二乙醇胺（MDEA）。结果：结果表明，二氧化碳吸收显着增加了MDEA替代品中的石灰窑载荷：+ 20％，另一个+ 100％。 MDEA替代方案需要几乎相同的投资成本，但与另一个相比，年度运营成本下降了970万美元（> 50％）。经济评估基于假设的贴现率为5％，并在预期的植物运作时间为25年。两种替代方案的估计总投资成本约为1.7亿美元。包括此替代品在内的整个工厂展示了正净值（超过1900万），内部返回率为5％，盈利指数为1.12，而其他替代方案在经济上不可行。结论：基于MDEA的合成气清洁技术代表了硫磺恢复的更有效和经济可行的选择。建模合成气清洁技术的主要缺点是，其估计的年度运营成本显着降低了在回收锅炉中传统的黑色酒燃烧对气化的预期利润率。必须进一步优化合成气清洁和硫磺恢复，以达到运营成本的显着减少，以提高黑液气化的经济可行性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号