李金凤;
LI Jinfeng;China Shenhua (Baotou) Charcoal Chemical Industry Co.,Ltd.;

• 1:神华包头煤化工有限责任公司

摘要(Abstract)：

煤气化技术作为煤炭高效清洁转化利用的重要技术,其无机组分约占20%,主要以气化灰渣(气化滤饼和粗渣)形式外排,其中气化滤饼碳含量达20%～50%,是资源化利用的关键技术瓶颈,由于缺乏对碳微观物化性质的深入分析,导致脱碳效率低、成本高,主要以堆存方式处理,造成环境污染。针对上述问题,以内蒙古某公司气流床气化得到的气化滤饼为研究对象,采用XRD谱图精修、粒度仪、扫描电镜、碳硫分析仪、热重分析仪以及灰熔点分析仪等对气化灰渣的元素/矿相组成、碳结晶度、碳在不同粒度中的分布规律、碳与无机相赋存形态和微观形貌、碳失重范围以及气化滤饼的反应活性等方面进行研究。结果表明:气化滤饼中碳主要以反应活性较高的无定型碳和惰性的石墨碳2种形态存在,其比例分别为92.94%和7.06%,其赋存形态主要是由煤种和气化条件决定;气化滤饼中碳赋存形态包括单独存在的絮状碳颗粒、与无机组分熔融的不规则颗粒,且细颗粒中含碳量高,粗颗粒中无机组分含量高; 500～700℃热重分析的失重高达27.38%,与碳硫分析和马弗炉烧失量结果较为一致,说明该部分烧失部分主要是碳的高温热解导致;通过分析灰熔融温度,发现软化温度在1 130℃,流动温度在1 247℃,在煤气化温度范围内具有较高的反应活性,可用于循环掺烧实现碳资源的高效回收利用。
Coal gasification technology is an important technology for the efficient and clean conversion and utilization of coal.Its inorganic components account for about 20%,which is mainly discharged in the form of gasification ash and slag( gasification filter cake and coarse slag),and especially the content ofcarbon in gasification filter cake is about 20-50%,which is the key technical bottleneck of resource utilization.Due to the lack of in-depth analysis of the microscopic physical and chemical properties of carbon in gasification ash and slag,the carbon removal efficiency is low and the cost is high,and the resource utilization is difficult.At present,it is mainly handled by stacking,resulting in serious environmental pollution. In the view of the above problems,the gasification filter cake obtained from entrained flow gasification of a company in Inner Mongolia was taken as the research object in this study.XRD spectrum refinement,particle size analyzer,scanning electron microscope,carbon and sulfur analyzer,thermogravimetric analyzer,ash melting point analyzer and other methods were adopted to study and analyze the elements/minerals phase composition,carbon crystallinity,the distribution of carbon in different particle sizes,the morphology and microstructure of carbon and inorganic phase,the weight loss range of carbon,and the reactivity of gasification filter cake.The results show that the carbon in the gasification filter cake is mainly composed of amorphous carbon with high reactivity and inert graphite carbon with the proportions of 92.94% and 7.06% respectively,which is mainly determined by the type of coal and gasification conditions.The morphology of carbon in the gasification filter cake includes flocculent carbon particles which exist alone and irregular carbon particles fused with inorganic components.The fine particles have a high carbon content and the coarse particles have a high inorganic component content.Under the condition of 500-700 ℃,a weight loss bythermogravimetric analysis is up to 27.38%,which is consistent with the results of carbon and sulfur analysis and muffle furnace loss of ignition,indicating that this part of the loss of ignition is mainly caused by the pyrolysis of carbon at high temperature.Through the analysis of ash melting point,it is found that the softening temperature is 1 130 ℃ and the flow temperature is 1 247 ℃ .The reactivity is high in the range of coal gasification temperature.It can be used for circulation of blending combustion to realize efficient recovery and utilization of carbon resources.

关键词(KeyWords)： 煤气化;气化滤饼;碳;基础物性;反应活性;高效脱碳
coal gasification;coal gasification filter cake;carbon;basic properties;reactivity;efficient decarburization

Abstract:

Keywords:

基金项目(Foundation): 神华包头煤化工有限责任公司工业固体废物物联网企业端建设项目(JG-20-15)

作者(Author): 李金凤;
LI Jinfeng;China Shenhua (Baotou) Charcoal Chemical Industry Co.,Ltd.;

Email:

DOI: 10.13226/j.issn.1006-6772.20042902

参考文献(References)：

• [1]煤化工信息网．现代煤化工是煤炭清洁高效利用的重要途径[EB/OL](2019-11-05).http://www.meihuake.net/detail-2-3097-c.html．
• [2]煤化工信息网．国家能源局:积极支持煤炭清洁高效利用相关项目的技术、装备研发[EB/OL].(2019-10-11).http://www.meihuake.net/detail-1-2887-c.html．
• [3]吴治国．煤气化原理及其技术发展方向[J]．石油炼制与化工,2015,46(4):22-28.WU Zhiguo.Coal gasification principle and its technology development direction[J].Petroleum Processing and Petrochemicals,2015,46(4):22-28．
• [4]唐宏青．现代煤化工新技术[M]．北京:化学工业出版社,2016.TANG Hongqing.Modern coal chemical industry new technology[M].Beijing:Chemical Industry Press,2016．
• [5]曲江山,张建波,孙志刚,等．煤气化渣综合利用研究进展[J]．洁净煤技术,2020,26(1):184-193.QU Jiangshan,ZHANG Jianbo,SUN Zhigang,et al.Research progress on comprehensive utilization of coal gasification slag[J].Clean Coal Technology,2020,26(1):184-193．
• [6]卢珊珊．气流床煤气化灰渣的特性研究[D]．上海:华东理工大学,2011.LU Shanshan.Study on the characteristics of slag and fly ash which generated from entrained-bed gasifiers[D].Shanghai:East China University of Science and Technology,2011．
• [7]胡文豪,张建波,李少鹏,等．煤气化渣制备聚合氯化铝工艺研究[J]．洁净煤技术,2019,25(1):154-159.HU Wenhao,ZHANG Jianbo,LI Shaopeng,et al.Study on the preparation of polyaluminium chloride from coal gasification residue[J].Clean Coal Technology,2019,25(1):154-159．
• [8]LI Zuzhong,ZHANG Yayun,ZHAO Hongyan,et al.Structure characteristics and composition of hydration products of coal gasification slag mixed cement and lime[J].Construction and Building Materials,2019,213:265-274．
• [9]PAN Chanchan,LIANG Qinfeng,GUO Xiaolei,et al.Charac-teristics of different sized slag particles from entrained-flow coal gasification[J].Energy Fuels,2016,30(2):1487-1495．
• [10]GUO Fanhui,MIAO Zekai,GUO Zhenkun,et al.Properties of flotation residual carbon from gasification fine slag[J].Fuel,2020,267:1-8．
• [11]AI Weidon,ZHANG Jiupeng,MIAO Shiding,et al.A low-cost and high-value reinforcing filler for styrene butadienerubber fabricated by a pneumatic separation technique from coal gasi-fication fine slag[J].Polymer Journal,2020,52:493-503．
• [12]高旭霞,郭晓镭,龚欣．气流床煤气化渣的特征[J]．华东理工大学学报(自然科学版),2009,35(5):677-683.GAO Xuxia,GUO Xiaolei,GONG Xin.Characterization of slag from entrained-flow coal gasificaion[J].Journal of East China University of Science and Technology(Natural Science Edition),2009,35(5):677-683．
• [13]WU Tao,GONG Mei,LESTER Ed,et al.Characterisation of residual carbon from entrained-bed coal water slurry gasifiers[J].Fuel,2007,86:972-982．
• [14]盛羽静．气流床气化灰渣的理化特性研究[D]．上海:华东理工大学,2017.SHENG Yujing.Study on physicochemical characteristics of slag from entrained-flow coal gasification[D].Shanghai:East China University of Science and Technology,2017．
• [15]张晓峰,王玉飞,范晓勇,等．煤气化细渣浮选脱碳分析[J]．能源化工,2016,37(5):54-57.ZHANG Xiaofeng,WANG Yufei,FAN Xiaoyong,et al.Analysis of decarbonization from coal gasification fine slag by flotation[J].Energy Chemical Industry,2016,37(5):54-57．
• [16]ZHANG Rui,GUO Fangyu,XIA Yangchao,et al.Recovering unburned carbon from gasification fly ash using saline water[J].Waste Management,2019,98:29-36．
• [17]杨玉芬,陈清如,骆振福．流态化技术干法脱炭的理论分析与试验研究[J]．中国矿业大学学报,2003,32(6):36-39.YANG Yufen,CHEN Qingru,LUO Zhenfu.Theoretiealanalysis and experimental research on dry removing carbon with fluidization method[J].Journal of China University of Science&Technology,2003,32(6):36-39．
• [18]MCMAHAN L Gray,KENNETH J Champagne,YEE Soong,et al.Physical cleaning of high carbon fly ash,fuel processing tech-nology[J].Fuel Processing Technology,2002,76(1):11-21．
• [19]UURUM M.Influences of Jameson flotation operation varia-bles on the kinetics and recovery of unburned carbon[J].Power Technology,2009,191(3):240-246．
• [20]王金福,唐强,郑妍妍,等．一种煤气化灰渣氧化脱碳制灰分联产蒸汽的方法:CN105441131B[P].2018-04-20.

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