摘要
中国的准东煤储量巨大,但由于其Na、Ca含量较高,燃烧准东煤的锅炉炉膛出口过热器表面上结渣和沾污问题严重。为了阐明其结渣机理,对某350 MW锅炉出口屏式过热器(烟气温度1 000℃左右)的焦样进行分析,发现焦体内部存在明显的分层结构,不同层焦样中元素含量明显不同,化合物形态也存在较大差异。这是由于在焦体发展过程中,随着沉积表面温度逐渐升高,焦体的灰颗粒之间发生差异较大的物理化学反应而形成的。通过对不同层焦样的化合物形态进行整理并详细分析,最终提出了各层不同化合物的形成机理。
The reserves of Zhundong （ZD） coal in China are huge. However, due to its high contents of Na and Ca, slagging and fouling are serious on the surface of the platen superheater at the furnace outlet area （at the flue gas temperature of around 1 000 ℃）. In this paper, to explore the mechanism of the slagging in the high alkali coal combustion process, study is conducted on the slag samples from the platen superheater of a 350-MW boiler. With the study, an obvious layered structure is observed in the slag, and the element compositions and compounds in each layer are very different. This is because in the developing of slags, with the deposite temperature rising, different physical-chemical reactions happen in the ash particles. Through the classification and the detailed analysis on the compounds in each layer, the formation mechanisms of those different compounds are proposed.
出处
《中国电力》
CSCD
北大核心
2016年第8期167-171,共5页
Electric Power
基金
国家自然科学基金资助项目(51376147
91544108
51306142)~~
关键词
高碱煤
屏式过热器
分层结构
结渣机理
high alkali coal
platen superheater
layered structure
slagging mechanism
作者简介
谭厚章（1965-），男，江西吉安人，教授，博士生导师，从事固体颗粒燃烧的着火、结渣、污染物控制等方面的研究工作。E-mail：tanhz@mail．xjtu．edu．cn
