Implementation of biorefining technologies in Kraft mills: impact assessment and feasibility

在牛皮纸厂实施生物精炼技术：影响评估和可行性

• 批准号: 364665-2007
• 负责人: Paris, Jean
• 金额: $ 5.77万
• 依托单位: École Polytechnique de Montréal
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=499141
• 关键词: Implementation; biorefining; technologies; Kraft; mills

The Kraft process produces wood pulp for the manufacture of high quality printing papers, tissue papers and packaging material. It is an attractive candidate for partial conversion to biorefinery while maintaining the manufacturing of its traditional core products. The premise of the forest biorefinery is that some of the organic constituents of the wood which are by-products of the chemical pulping step dissolved in the spent liquor may be used for greater advantage than being burnt on-site to recover their beating value as is currently done; they could be used as feedstock for the manufacture of a broad variety of products which have a significant market value. However, the conversion of a Kraft mill to a biorefinery will profoundly modify its capacity for sustainable energy production. This project proposes to develop a methodology and criteria to evaluate the techno-economic feasibility of biorefinery options for Canadian Kraft mills. Starting from the base-case of highly integrated and energy efficient Kraft mills, we will apply state-of-the-art simulation techniques and systems engineering tools to examine the effects of key biorefinery technologies on the energy balance and operating cost of the process. They are, lignin precipitation, hemicelluloses extraction and biomass gasification. A new methodology for advanced energy efficiency analysis will be developed and applied to the study. It will take into account the factors that affect energy consumption individually and in conjunction: internal energy recovery, use of steam injection and mixing, water systems closure, heat and power production and the incorporation of energy upgrading technologies (co- and tri-generation, absorption heat pumps). Economic viability will be assessed by a new thermo-economic analysis method. The impacts of biorefining technologies on the process air emissions will be determined. The major outcome of this project will be guidelines that can be applied to examine the feasibility of proposed biorefinery concepts, guide investments in these technologies and help develop research strategies that address technical impediments. Models of biorefinery unit operations and a unique process simulation software for pulp mill-based biorefineries will be produced and validated.

牛皮纸工艺生产用于制造高质量印刷纸、薄纸和包装材料的木浆。它是部分转变为生物精炼厂同时保持其传统核心产品制造的有吸引力的候选者。森林生物精炼厂的前提是，溶解在废液中的化学制浆步骤的副产品木材的一些有机成分可以比目前在现场燃烧以恢复其打浆价值具有更大的优势；它们可用作制造多种具有重要市场价值的产品的原料。然而，牛皮纸厂改建为生物精炼厂将深刻改变其可持续能源生产的能力。该项目建议制定一种方法和标准来评估加拿大牛皮纸厂生物精炼方案的技术经济可行性。从高度集成和节能的牛皮纸厂的基本案例开始，我们将应用最先进的模拟技术和系统工程工具来研究关键生物精炼技术对能量平衡和工艺运营成本的影响。它们是木质素沉淀、半纤维素提取和生物质气化。将开发一种先进能源效率分析的新方法并将其应用于该研究。它将单独和综合考虑影响能源消耗的因素：内部能源回收、蒸汽喷射和混合的使用、水系统关闭、热电生产以及能源升级技术的结合（热电联产和三联产、吸收式热泵）。经济可行性将通过新的热经济分析方法进行评估。将确定生物精炼技术对工艺废气排放的影响。该项目的主要成果将是指导方针，可用于审查拟议的生物精炼概念的可行性，指导对这些技术的投资，并帮助制定解决技术障碍的研究策略。将制作并验证生物精炼单元操作模型和基于纸浆厂的生物精炼厂的独特工艺模拟软件。