双螺杆挤出机论文：ZSK300型双螺杆挤压造粒机组扩能改造方法的研究.doc

双螺杆挤出机论文：ZSK300型双螺杆挤压造粒机组扩能改造方法的研究【中文摘要】在石化企业大型挤压造粒机组中,通常采用双螺杆挤压造粒机组实现对合成树脂的造粒。企业为了适应市场需求不断提高产能,需要对现有设备进行技术创新,提高设备的利用率以及合成树脂的产量和品质。所以,现有设备的技术改造对提高造粒机组的产量和工艺适应性有重大的现实意义和经济效益。本文基于混炼能量等效原理对双螺杆挤压造粒机组扩能改造方法进行研究,利用比能耗理论对造粒机组进行能效分析；采用有限元分析软件POLYFLOW对双螺杆挤出机的混炼段进行三维非等温流动数值模拟及统计学分析,并借助平均解聚功和修正Lyapunov指数等参量评价混炼流场的混合特性；讨论了产量、熔融指数与捏合块错位角、厚度以及混炼段长度之间的关系。通过对模拟和实验结果的分析,得出以下几点结论：(1)调整捏合块的几何结构(如错位角、厚度)和混炼段的长度是双螺杆挤压造粒机组扩能改造的方法之一。(2)在产量一定的条件下,错位角越大、捏合盘厚度越小,分布混合效果越好；捏合盘的厚度越大对分散混合越有利。(3)当产量提高15%时,模拟和实验结果表明,通过增加两个捏合盘可以使最终混炼效果与提高产量前等效。(4)熔融指数对混炼效果的影响与螺杆结构有很大关系,对于熔融指数较小的物料,可以通过加长混炼段来延长物料混炼时间,或者增加宽度较小的捏合盘来改变混炼流场的分布,从而改善分散和分布混合效果。(5)从混炼机能量利用率,过滤网和模板温度控制等方面提出扩能降耗的运行措施。【英文摘要】Twin-screw extrusion granulator was usually used to achieve the synthetic resin granulation in the petrochemical unit. For the purpose of increasing the production capacity to meet market demand, it is necessary to innovate the technology, improve the equipment, increase the output and quality of synthetic resin. Therefore, in order to improve the production output and process adaptability, capacity expansion of existing equipment is of great practical significance and economic benefits.In this paper, the capacity expansion method of twin screw extruder was studied based on the energy equivalence principle. Specific energy consumption was employed for the analysis of energy efficiency of the granulation unit. The finite element analysis software POLYFLOW was adopted to simulate three-dimensional non-isothermal flow field in the mixing section of twin-screw extruder. The mixing characteristics were evaluated by the parameters of average deagglomerating energy, the modified Lyapunov index, and so on. The relationship between production output, melt index, stagger angle, disc width and length of the mixing section was discussed. Based on the analysis and experiments, the main conclusions are made as follows:(1) To adjust the geometry of kneading block (such as stagger angle and disc width) and the length of mixing section is one of the methods which study the capacity expansion of twin-screw extrusion granulator unit.(2) Small disc width and large stagger angle provide good distributive mixing performance when the production output is constant. The bigger the disc width is, the better the effect of dispersive mixing will be.(3) The analysis results show that the satisfied mixing performance can be obtained by adding two discs at the mixing section when the production output increases 15%.(4) The influence of melt index on mixing performance has a closed relationship with the screw structure. For the small melt index, mixing section length can be lengthened to extend the mixing time, or to add the smaller width disk to change the mixing flow field.(5) The measures of capacity expansion and energy consumption decreasing were proposed according to the energy efficiency of mixer, the filter and the temperature control of the template.【关键词】双螺杆挤出机 分散和分布混合 混炼等效 扩能改造【英文关键词】twin-screw extruder dispersive and distributive mixing equivalent mixing performance capacity expansion【备注】索购全文在线加我：1.3.99.3.8848 同时提供论文一对一写作指导和论文发表委托服务【目录】ZSK300型双螺杆挤压造粒机组扩能改造方法的研究摘要5-6Abstract6-7第1章 绪论12-231.1 选题背景及意义12-131.2 造粒机组的发展现状13-161.3 造粒设备扩能改造的研究进展16-181.4 混炼效果表征方法的研究进展18-211.5 本文的研究内容21-23第2章 挤压造粒机组混炼能效分析23-332.1 某石化企业塑料厂造粒机组基本概况23-242.2 造粒机组能效分析24-322.2.1 造粒机组的实际能耗及其构成25-272.2.2 造粒机组的理论能耗及其构成27-302.2.3 造粒机组的能量利用率30-312.2.4 造粒机组产能提升的改进措施31-322.3 本章小结32-33第3章 双螺杆挤压造粒机组混炼效果的表征体系及实验33-433.1 造粒机组混炼效果的评价指标33-363.2 混炼效果表征体系的实验评估36-423.2.1 实验方法、设备及原料配方36-383.2.2 实验结果分析38-423.2.3 模拟结果分析423.3 本章小结42-43第4章 ZSK300型双螺杆挤压造粒机组混炼段数值分析43-584.1 数值模拟软件POLYFLOW概述43-454.2 捏合段模型的建立45-514.2.1 数学模型45-464.2.2 物理模型及网格划分46-514.3 捏合段的相关参数设置51-524.3.1 边界条件514.3.2 物性参数51-524.4 数值模拟结果分析52-564.4.1 混炼段聚合物熔体流场中的温度分布52-534.4.2 混炼段聚合物熔体流场中的压力分布53-554.4.3 混炼段聚合物熔体流场中的混合指数分布55-564.5 本章小结56-58第5章 ZSK300型双螺杆挤压造粒机组扩能改造的混炼效果分析58-725.1 喂料速率对造粒机组产能提升能力的影响58-685.1.1 单一错位角的捏合块混炼效果58-605.1.2 混合错位角的捏合块混炼效果60-625.1.3