摘要
近些年来,为了提高纤维分离质量和降低能耗,磨片结构研究成为热点关注领域之一。国内外许多学者就磨片结构对纤维解离质量及能耗影响,展开了数学理论分析及实验研究。但基于传热学理论对上述关系的研究较少,因此本研究以传热学理论为基础展开研究。由于磨片处于高温高压的复杂工作环境中,不便于以实验的形式探究磨片的工作状态,故以传热学理论为依据,对现有磨片的工作状态进行理论和建模分析,根据分析结果,综合考虑原料特点后,提出磨片结构的改进方案:改变破碎区磨齿齿形;减小粗磨区和精磨区磨齿齿倾角;减少粗磨区磨齿数量,降低周向齿齿高;在破碎区和粗磨区间,粗磨区和精磨区间分别设置缓冲区域。将现有和改进型磨片建模分析结果进行对比,结果表明:磨片结构对纤维解离质量及能耗有较大的影响,改进型磨片不同区域温度场及热通量分布差异及平均值减小,受到的热应力较小,研磨工况较稳定;摩擦作用减弱,磨片热稳定性提高,纤维解离质量提高,因摩擦产生的能耗降低22.7%,验证了改进设计的合理性。
In recent years,in order to improve the quality of fiber separation and reduce energy consumption,the research of refining disk structure is one of the hot research areas.Many scholars in the world have carried out experimental research exploring the influence of refining disk structure on fiber dissociation quality and energy consumption.However,there are limited studies on theoretically analyzing the relationship between the refining disk structure and fiber dissociation quality/energy consumption so this study was aimed at improving fiber quality and reducing energy consumption through modifying the structure of refining disk based on heat transfer theory.Because the refining disk is in the complex working environment of high temperature and high pressure.It is not convenient to explore the working state of the refining disk during the experiments.Thus,according to the actual working conditions after consulting the relevant production data,the following research activities were carried out.Based on the heat transfer theory,the working state of the existing refining disk was analyzed theoretically,and the modeling analysis of the refining disk was carried out.According to the analysis results and considering the characteristics of raw materials,the improvement scheme of the refining disk structure was proposed,which included changing the grinding teeth profile in the crushing area,reducing the inclination angles of grinding teeth in the rough and the fine refining area,the numbers of refining teeth in the rough refining area and the height for circumferential tooth,setting up buffer areas in crushing area and rough refining zone,rough and fine refining zone,respectively.By comparing the modeling analysis results of the existing disk and improved refining disk,it was revealed that the structures of the refining disk had a great influence on the fiber dissociation quality and energy consumption;the differences of temperature field and heat flux distribution in different areas of the improved disk and average heat flux were reduced,the thermal stress was sreduced;the refining condition was stable,the friction was weakened,the thermal stability of the refining disk and fiber dissociation quality were improved,and the energy consumption due to friction was reduced by 22.7%;the rationality of the improved design was verified.
作者
李晓旭
张成旭
花军
陈光伟
LI Xiaoxu;ZHANG Chengxu;HUA Jun;CHEN Guangwei(Beijing Forestry Machinery Research Institute,National Forestry and GrasslandAdministration,Beijing 100029,China;Dongfang Electric<Tianjin>Wind Turbine Blade Engineering Co.Ltd.,Tianjin 300480,China;Northeast Forestry University,Harbin 150040,China)
出处
《林业工程学报》
CSCD
北大核心
2021年第5期128-134,共7页
Journal of Forestry Engineering
基金
教育部高等学校博士学科点专项科研基金(博导类)课题(20130062110005)。
关键词
磨片结构
纤维解离
建模分析
热稳定性
能耗
refining disk structure
fiber dissociation
modeling analysis
thermal stability
energy consumption
