针对准东煤碱金属含量高导致灰熔融温度低、在燃烧过程中容易造成沾污及结焦等问题，利用恒温热重实验系统，研究了准东煤的燃烧特性及温度、煤种掺混等对燃烧特性的影响。实验结果表明：单煤煤种燃烧过程中，不同煤种燃尽时间、燃烧速率存在显著差异，其中路茂通坎乡煤种和永华金泰煤种差异最大，路茂通坎乡煤种易着火，燃烧速率快，燃尽时间短；随着温度升高，单煤燃烧失重曲线发生左移，燃尽时间缩短，燃烧速率上升，表明温度升高会加速煤粉燃烧，并且1 000 ℃后提高温度对焦碳燃尽的促进作用更明显；掺混燃烧过程中，掺烧高挥发分的煤种可以有效改善煤粉燃烧初期着火特性，而掺烧高固定碳煤种可使燃尽时间延长，从而降低燃尽率；混煤掺烧能够提高灰熔点，有效改善准东煤熔融特性，从而在煤源方面减少或者避免炉膛受热面沾污、结渣，确保锅炉运行的安全性和经济性。

Aiming at the problems of low ash melting temperature caused by high alkali metal content in Zhundong coal and fouling and coking in the combustion process,the thermostatic thermogravimetric experimental system was used to study the combustion characteristics of Zhundong coal and the influence of temperature and blended coal on the combustion characteristics.The research results show that during the combustion of single coal,there is a significant difference in the burnout time and the combustion rate between different types of coal,among which LM and YH have the largest difference.By comparison,LM has better ignitability,faster combustion and shorter burnout time.With increasing temperature,the weight loss curve of single coal shifts left,the burnout time shortens and the burning rate enhances,indicating that the coal combustion accelerates at higher temperatures,and the positive effect of higher temperature on char burnout is more significant above 1 000 ℃.During the combustion of blended coal,the highvolatile coal can improve the ignition characteristics at the initial stage of burning effectively.However,the burnout time of blended coal can be prolonged by mixing with high fixed carbon coal,leading to a lower burnout rate.Furthermore,the blending combustion can increase the ash melting temperature,improving the melting characteristics of Zhundong coal effectively.This helps to reduce or avoid the contamination and slagging of heating surface,thereby ensuring the security and economy of boiler.

TK227.1

国网河北能源技术服务有限公司科技项目（TSS2020-17）