【作者】 陆浩；

【导师】 王慧；

【作者基本信息】 浙江大学 ， 系统工程， 2003， 硕士

【摘要】 全世界纸浆产量中，化学制浆约占60％，其中90％以上是由硫酸盐法所生产。蒸煮过程是硫酸盐制浆生产中的重要工段，蒸煮的质量与得率直接影响后续工序以及成纸的质量和工厂的效益。所以，研究蒸煮工艺过程，在蒸煮过程实现先进的自动控制，对稳定纸浆质量、提高产量、节约能源、降低消耗具有重要意义。另一方面，从清洁生产的角度考虑，在达到纸浆得率和质量要求的前提下，在蒸煮过程中如何尽可能地控制污染物产生，既减轻后续碱回收系统处理黑液的负荷，又最大限度地降低对环境的污染也是自动控制系统需要考虑的目标。在计算机控制系统已经或正在普及的现代化制浆造纸工业，基于这种思想的控制策略是企业减少污染排放量、实现清洁生产的可行途径之一。因此，研究蒸煮过程的先进技术，以更恰当的模型描述蒸煮过程并设计先进的控制系统非常必要。 出于上述考虑，本文作为国家自然科学基金资助项目“基于分布式智能化的建模与优化的制浆造纸清洁生产策略的研究(编号69974034)”工作的一部分，对硫酸盐法制浆中连续蒸煮过程的建模与控制进行了研究。研究的主要内容如下：(1)对蒸煮过程中有效碱的测量技术、蒸煮模型和控制系统的发展概况作了综述；(2)根据连续制浆蒸煮过程的反应机理，应用正交配置方法建立了动态模型，并进行了模型仿真；(3)根据文献中蒸煮过程经验模型产生的数据，设计了基于子空间辨识的蒸煮过程推断控制，并作了计算机仿真研究；(4)针对蒸煮过程脱木素反应的特点，设计了有效碱浓度在线软测量系统及蒸煮过程的推断控制算法；最后对工作进行了总结并指出了蒸煮过程迫切需要解决的问题以及以后的发展趋势。更多还原

【Abstract】 Sixty percent of pulp yield is chemistry pulp in the world, and above 90% of chemistry pulp is kraft pulp. Cooking process is an important workshop section in kraft pulp. On the one hand, the quality of cooking process influence directly the following workshop section and quality and yield of paper and benefit of plant. On the other hand, in view of cleaner production, the objective in optimal control of a continuous pulp digester is to achieve maximum pulp production at a specified kappa number with a minimum of chemicals and energy input. The control strategy based on the idea is the feasible approach to reducing pollution and realizing cleaner production. Therefore, it is necessary to study a suitable model and advanced control system on a continuous pulp digester. In addition, it is urgent affairs to develop the related measurement instrument with lower cost.Based on the above objective, as one part of the work about distributed intelligent modeling and optimization method for cleaner production of pulp and paper industry (National Science Fund, No. 69974034), the measurement technology of effective alkali, the model of continuous digester and control system are summarized in the introduction of this paper and studied deeply in the following chapters. The main content of the thesis include: (1) A dynamic model of the continuous pulp digester is developed by applying the method of orthogonal collocation and a simulation study is present showing dynamical effects of input and parameter changes. (2) Subspace identification based inferential control is applied to a continuous pulp digester. And the idea is tested on the continuous digester. (3) Based on the principle of conductance measuring liquor concentration, the online soft-measure system of effective alkali concentration is designed.更多还原