不同赋存形态碱金属在单颗粒煤燃烧过程中的释放行为  

Release Behavior of Alkali Metals With Different Occurrence Forms During Combustion of Single Particle Coal

作　　者：何雅娟 白静云 门小勇 宋旭东 白永辉 王焦飞 于广锁[3] HE Yajuan;BAI Jingyun;MEN Xiaoyong;SONG Xudong;BAI Yonghui;WANG Jiaofei;YU Guangsuo(State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering(College of Chemistry and Chemical Engineering,Ningxia University),Yinchuan 750021,Ningxia Hui Autonomous Region,China;Methanol Branch of Ningxia Coal Industry Company of National Energy Group,Yinchuan 750000,Ningxia Hui Autonomous,China;Institute of Clean Coal Technology of East China University of Science and Technology,Xuhui District,Shanghai 200237,China)

机构地区：[1]省部共建煤炭高效利用与绿色化工国家重点实验室(宁夏大学化学化工学院),宁夏回族自治区银川市750021 [2]国家能源集团宁夏煤业公司甲醇分公司,宁夏回族自治区银川市750000 [3]华东理工大学洁净煤技术研究所,上海市徐汇区200237

出　　处：《中国电机工程学报》2024年第22期8968-8979,I0023,共13页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家自然科学基金项目(22108132,U21A20318);宁夏自然科学基金项目(2023AAC01001)。

摘　　要：由于高碱煤含有钠、钾等碱金属,在热利用过程中会造成换热器壁面的结焦、结渣、腐蚀等问题,对电厂设备的安全、高效运行构成严重威胁。该文利用电感耦合等离子体发射光谱仪(inductively coupled plasma-optical emission spectrometer,ICP-OES),测量单颗粒洋场湾(YCW)煤和淖毛湖(NMH)煤中各种赋存形态碱金属的含量,利用高速相机和高光谱成像系统,获得单颗粒YCW煤和NMH煤燃烧过程和火焰的自发辐射光谱图像。结果表明:YCW煤和NMH煤中,碱金属Na^(*)、K^(*)大部分以水溶性的形态存在;碱金属Na^(*)在单颗粒煤燃烧过程中呈两段式的阶段特征,各类型的碱金属Na^(*)在燃烧过程中均会释放,其中大部分以水溶钠的形式释放,不溶态碱金属很难在煤燃烧过程中释放;单颗粒煤在经历水洗酸洗之后,出现了气相着火延迟时间提前和燃尽时间延迟的现象。通过该文研究,以期为构建煤在燃烧的不同阶段的碱金属转化动力学模型以及控制碱金属的释放提供理论依据。As high alkali coal contains sodium,potassium and other alkali metals,it may cause coking,slagging,corrosion and other problems on the heat exchanger wall during the heat utilization process,which poses a serious threat to the safe and efficient operation of the power plant equipment.In this article,the contents of alkali metals occurrence in single-particle YCW and NMH coals are measured using inductively coupled plasma emission spectrometry(ICP-OES).Using a high-speed camera and a hyperspectral imaging system,images of the combustion process and spectral images of spontaneous radiation from the flames of single-particle YCW and NMH coals are obtained.The results show that most of the alkali metals Na^(*)and K^(*)exist in water-soluble forms in YCW and NMH coals;Alkali metal Na^(*)exhibits a two-stage characteristic during the combustion process of single particle coal.and all types of alkali metal Na^(*)are released during the combustion process,most of which are released in the form of water-soluble sodium.Insoluble alkali metals are difficult to release during the coal combustion process.Single-particle coals show early gas-phase ignition time and delayed burnout time after undergoing water-washing and acid-washing.The above studies are conducted with a view to providing a theoretical basis for constructing a kinetic model ofalkali metal transformation of coal at different stages ofcombustion as well as controlling the release of alkali metals.

关 键 词：单颗粒煤 碱金属Na^(*) 碱金属K^(*) 释放特性 燃烧特性 

分 类 号：TQ546[化学工程—煤化学工程]