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Development of a strategy for energy efficiency improvement in a Kraft process based on systems interactions analysis.

机译：基于系统交互分析，开发牛皮纸工艺中提高能源效率的策略。

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摘要

The objective of this thesis is to develop, validate, and apply a unified methodology for the energy efficiency improvement of a Kraft process that addresses globally the interactions of the various process systems that affect its energy performance. An implementation strategy is the final result. An operating Kraft pulping mill situated in Eastern Canada with a production of 700 adt/d of high-grade bleached pulp was the case study.;The methodology consists of four successive stages. The first stage is the base case definition. The development of a focused, reliable and representative model of an operating process is a prerequisite to the optimization and fine tuning of its energy performance. A four-pronged procedure has been developed: data gathering, master diagram, utilities systems analysis, and simulation. The computer simulation has been focused on the energy and water systems. The second stage corresponds to the benchmarking analysis. The benchmarking of the base case has the objectives of identifying the process inefficiencies and to establish guidelines for the development of effective enhancement measures. The studied process is evaluated by a comparison of its efficiency to the current practice of the industry and by the application of new energy and exergy content indicators. The minimum energy and water requirements of the process are also determined in this step. The third stage is the core of the methodology; it represents the formulation of technically feasible energy enhancing options. Several techniques are applied in an iterative procedure to cast light on their synergies and counter-actions. The objective is to develop a path for improving the process so as to maximize steam savings while minimizing the investment required. The fourth stage is the implementation strategy. As the existing process configuration and operating conditions vary from process to process it is important to develop a strategy for the implementation of energy enhancement programs in the most advantageous way for each case. A three-phase strategy was selected for the specific case study in the context of its management strategic plan: the elimination of fossil fuel, the production of power and the liberation of steam capacity. A post-benchmarking analysis is done to quantify the improvement of the energy efficiency. The performance indicators are computed after all energy enhancing measures have been implemented.;The improvement of the process by applying the unified methodology results in substantially more steam savings than by applying individually the typical techniques that it comprises: energy savings of 5.6 GJ/adt (27% of the current requirement), water savings of 32 m3/adt (34% of the current requirement) and an electricity production potential of 44.5MW.;As a result of applying the unified methodology the process becomes eco-friendly as it does not require fossil fuel for producing steam; its water and steam consumptions are below the Canadian average and it produces large revenues from the production of green electricity;The Pulp and Paper industry is Canada's premier industry. It is characterized by large thermal energy and water consumption. Rising energy costs and more stringent environmental regulations have led the industry to refocus its efforts toward identifying ways to improve energy and water conservation. Energy and water aspects are usually analyzed independently, but in reality they are strongly interconnected. Therefore, there is a need for an integrated methodology, which considers energy and water aspects, as well as the optimal utilization and production of the utilities.
机译：本文的目的是开发，验证和应用统一的方法来提高卡夫工艺的能效，从而全面解决影响其能效的各种工艺系统之间的相互作用。实施策略是最终结果。案例研究位于加拿大东部的一家经营牛皮纸制浆厂，其日产量为700 adt /年的高级漂白纸浆。该方法包括四个连续的阶段。第一阶段是基本案例定义。开发集中，可靠且具有代表性的操作过程模型是对其能源性能进行优化和微调的前提。已经开发了一个四管齐下的程序：数据收集，主图，公用事业系统分析和仿真。计算机仿真一直集中在能源和水系统上。第二阶段对应于基准分析。基本案例的基准测试的目的是确定流程效率低下并为开发有效的增强措施建立指导方针。通过将其效率与该行业的当前实践进行比较，并通过应用新能源和火用含量指标，对所研究的过程进行评估。在此步骤中还确定了过程的最低能量和水需求。第三阶段是方法论的核心。它代表了技术上可行的能源增强方案的制定。在迭代过程中应用了多种技术来阐明它们的协同作用和反作用。目的是开发一条改进工艺的途径，以在最大程度减少所需投资的同时，最大程度地节省蒸汽。第四阶段是实施策略。由于现有的过程配置和操作条件因过程而异，因此针对每种情况以最有利的方式制定一种策略以实施能源增强计划非常重要。在其管理战略计划的背景下，针对特定案例研究选择了三个阶段的战略：消除化石燃料，发电和释放蒸汽量。进行基准测试后分析以量化能源效率的提高。性能指标是在实施所有节能措施后计算得出的;与采用单独的典型技术相比，采用统一的方法进行流程改进可显着节省更多的蒸汽：节能5.6 GJ / adt（ 27％的当前需求），节水32 m3 / adt（当前的需求的34％）和44.5MW的发电潜力。;由于采用了统一的方法，该过程与以往一样变得生态友好不需要化石燃料来产生蒸汽；它的水和蒸汽消耗量低于加拿大的平均水平，并且通过生产绿色电力获得了可观的收入；制浆造纸业是加拿大的主要产业。它的特点是热能和水消耗大。不断上涨的能源成本和更严格的环境法规使该行业重新将精力集中在确定改善能源和节水的方法上。能源和水的方面通常是独立分析的，但实际上它们是紧密关联的。因此，需要一种综合的方法，该方法应考虑能源和水方面以及公用事业的最佳利用和生产。

著录项

  • 作者

    Mateos-Espejel, Enrique.;

  • 作者单位

    Ecole Polytechnique, Montreal (Canada).;

  • 授予单位 Ecole Polytechnique, Montreal (Canada).;
  • 学科 Engineering Chemical.;Energy.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 238 p.
  • 总页数 238
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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