基于正交实验的准格尔煤水煤浆性能优化  

Performance optimization of Jungar coal-water slurry based on orthogonal experiment

作　　者：张国庆 李云妹 黄涌波 刘海军[2] 黄中 ZHANG Guoqing;LI Yunmei;HUANG Yongbo;LIU Haijun;HUANG Zhong(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Tsinghua University,100084 Beijing,China;Shenhua Jungar Energy Company Limited,010300 Ordor,China;School of Chemical and Environmental Engineering,China University of Mining and Technology(Beijing),100083 Beijing,China)

机构地区：[1]清华大学热科学与动力工程教育部重点实验室,北京100084 [2]神华准格尔能源有限责任公司,内蒙古鄂尔多斯010300 [3]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《煤炭转化》2023年第4期20-27,共8页Coal Conversion

基　　金：国家能源投资集团科技创新项目(神华准能合(2021)1729).

摘　　要：准格尔煤燃烧后灰渣中氧化铝含量高,采用循环流化床燃烧准格尔煤水煤浆可进一步提高灰渣中氧化铝的提取效率和氧化铝活性,具有极高的技术潜力。采用三因素六水平正交实验法研究了粗粒级和超细粒级煤粉质量比、细粒级煤粉质量分数及分散剂亚甲基双萘磺酸钠(NNO)添加量对准格尔煤水煤浆定浓黏度(浆体浓度60%)的影响,对比分析了不同制浆方案下浆体的最大成浆浓度(浆体表观黏度为1200 mPa·s)、流动性、稳定性和流变特性。结果表明,影响准格尔煤水煤浆定浓黏度的因素由主到次依次为粗粒级和超细粒级煤粉质量比、分散剂NNO添加量、细粒级煤粉质量分数;正交实验得到的最佳工艺条件为,粗粒级和超细粒级煤粉质量比4∶1、细粒级煤粉质量分数40%、NNO添加量0.35%,此时浆体的定浓黏度为479 mPa·s,最大成浆浓度为63.5%,流动性为12.3 cm,稳定性为15 d;三峰级配方式下,准格尔煤水煤浆可获得更好的浆体性能,其最大成浆浓度相较于双峰级配方式提升超过了2%,是更适用于制备准格尔煤水煤浆的级配方式。The ash slag from Jungar coal possesses high utilization value due to its substantial content of aluminum oxide.Meanwhile,the combustion of Jungar coal-water slurry in circulating fluidized bed can significantly boost the extraction efficiency and activity of alumina,making it a method with remarkable technical potential.In this paper,the influences of the mass ratio of coarse to ultra-fine pulverized coal,the mass fraction of fine pulverized coal,and the amount of NNO dispersant on the constant concentration viscosity(slurry concentration was 60%)of Jungar coal-water slurry were studied using the three-factor six-level orthogonal experimental method.Besides,the maximum slurry concentration(slurry apparent viscosity was 1200 mPa·s),fluidity,stability and rheological properties of the slurry under different slurry preparation schemes were compared and analyzed in detail.The results indicate that the factors affecting the constant viscosity of Jungar coal-water slurry,ranked by their impact magnitude,are the mass ratio of coarse to ultra-fine pulverized coal,the amount of NNO dispersant,and the mass fraction of fine pulverized coal,respectively.Moreover,the optimal technological conditions derived from the orthogonal experiment are as follows:a mass ratio of coarse to ultra-fine pulverized coal of 4∶1,a mass fraction of fine pulverized coal of 40%,and an NNO dispersant addition of 0.35%.Under these conditions,the constant concentration viscosity of the slurry is 479 mPa·s,the maximum slurry concentration is 63.5%,the fluidity is 12.3 cm,and the stability is 15 d.In addition,the adoption of the three-peak grading method yields enhanced slurry performance,with an increase in maximum slurry concentration of over 2%compared to the double-peak grading method.Therefore,the three-peak grading method is more suitable for the preparation of Jungar coal-water slurry.

关 键 词：准格尔煤 正交实验 粒度级配 分散剂 稳定性 流变特性 

分 类 号：TQ536.1[化学工程—煤化学工程]