电力科技与环保2025，Vol.41Issue(5)：759-768,10.DOI:10.19944/j.eptep.1674-8069.2025.05.007
新疆高碱煤掺烧及结渣特性实验研究
Experimental study of combustion and slag characteristics of blended Xinjiang high alkali coal
摘要
Abstract
[Objective]Xinjiang coal has huge reserves,but due to its richness in alkali metals,it is prone to slagging and staining problems in boiler combustion,which limits its large-scale application.The aim of this study is to optimise the combustion characteristics and inhibit slagging through mixed coal combustion technology to provide theoretical support for the safe and environmentally friendly use of Xinjiang coal resources.[Methods]Wangbu coal,Xinjiang high red sand spring high alkali coal,medium-high calorific value mixed coal,medium-low calorific value mixed coal and high sulphur coal were selected as experimental raw materials,and the coal quality and ash composition of different coal types were analysed,and the combustion characteristics and melting mechanism of Xinjiang high alkali coal with different coal proportion were then studied by a one-dimensional flame burner and a black-body furnace,respectively,to quantify the flame temperature by using two-color pyrometry.The melting and slagging of ash samples was investigated by the high-temperature experiments of the black-body furnace.The melting and slagging behaviours of the ash samples were investigated,and the ash morphology and minimum slagging temperature were analyzed.[Results]The results show that the blending of appropriate amount of Xinjiang high alkali coal can effectively improve the combustion characteristics of coal samples.Particularly when Xinjiang high-alkali coal is blended with other coal types(such as medium-to-high calorific value coal),it can increase the flame temperature,rising from 688 ℃ without blending to 809 ° C with a 25%blend of Xinjiang high-alkali coal,thereby promoting more complete combustion of the coal.In terms of slagging,as the proportion of Xinjiang high-alkali coal increases,the ash melting point decreases,making slagging more likely.However,when Xinjiang coal is co-fired with medium-to-high calorific value blended coal or high-sulfur coal,the slagging temperature of the coal ash increases from 1,100 ℃ to 1,200 ℃,effectively reducing slagging.Therefore,by adjusting the blending ratios of different coal types,it is possible not only to increase the flame temperature and enhance combustion performance but also to effectively suppress slagging.[Conclusion]Blended coal combustion technology can synergistically improve combustion efficiency and anti-slagging ability by optimising the ratio(e.g.25%～50%Xinjiang coal+medium-high calorific value coal).Mixing medium-high calorific value blended coal or high sulfur coal can significantly improve the ash melting temperature.This study provides a key technical basis for the large-scale clean utilisation of high alkali coals in Xinjiang.关键词
新疆高碱煤/混煤燃烧技术/燃烧特性/结渣Key words
high-alkali coal from xinjiang/mixed coal combustion technology/combustion characteristics/slagging分类
能源科技引用本文复制引用
赵秉庆,李泯材,王依敬,饶钊,雷领,彭国宇..新疆高碱煤掺烧及结渣特性实验研究[J].电力科技与环保,2025,41(5):759-768,10.基金项目
江苏重点产品碳足迹标识创新体系构建及应用示范项目(BT2024013) （BT2024013）
江苏省碳达峰碳中和科技创新专项资金项目(BE2023854) （BE2023854）
