高钠准东煤在循环流化床燃烧中的受热面沾污结渣和床料烧结特性研究

循环流化床燃烧高钠准东煤时受热面的积灰结渣严重影响了锅炉电站的正常运行。本项目旨在研究循环流化床燃烧准东煤时受热面沾污结渣特性和床料烧结特性，并探讨不同方法（水洗、混煤、以及使用添加剂）对固定碱金属蒸汽以及缓解受热面沾污特性和床料烧结特性的影响。实验研究首先在实验室等级循环流化床试验系统上利用炉内不同位置的空冷控温取样枪制取灰样。然后对制取灰样和床料的化学成分、矿物组成、熔化温度、烧结温度以及其表观形态进行研究分析表征。通过上述分析研究，该项目拟解决流化床燃烧准东煤的关键问题包括碱金属和碱土金属在炉内燃烧过程中的蒸发、固化和转化特性、其在炉内各受热面的浓度和矿物组成差异、碱金属和碱土金属对床料烧结的影响以及水洗、混煤和使用添加剂对减缓受热面沾污特性和床料烧结特性的影响。实验结果能够加深对循环流化床燃烧准东煤时受热面沾污结渣和床料烧结的理解，为清洁高效燃烧准东煤提供扎实的科研基础。

Severe ash fouling and slagging problems during combustion of Zhundong lignite in Circulating Fluidised-Bed (CFB) boilers have occurred and greatly influenced its stable operation. This project is therefore aimed to investigate the fouling and slagging characteristics of the ashes on heat transfer surfaces as well as the sintering characteristics of bed materials during combustion of Zhundong lignite in CFB boilers. Meanwhile, this project is aimed to develop strategies including water washing, coal blending and the use of additives to mitigate its fouling, slagging and sintering characteristics. These aims could be achieved through the analysis into the chemical composition, mineralogical and morphological characteristics, fusion and sintering temperatures of the ash samples prepared on air-cooled ash sampling probes at different locations in the lab-scale CFB system. The results of this project are expected to provide comprehensive understandings on the key fundamental research problems including the release, solidification and transformation of alkali and alkali earth, the concentration and mineralogy of alkali and alkali earth, the reaction mechanisms between alkali vapour and other minearls, the effect of alkali and alkali earth on the sintering of bed materials, and the influence of water washing, coal blending and additives during combustion of Zhundong lignite in CFB boilers. The outcome of this project is expected to provide fundamental scientific support for clear and effective combustion of high sodium Zhundong lignite.