高钠煤煤灰对NaCl蒸气捕获性能分析  

Analysis of NaCl Vapor Capture Capability of Sodium-rich Coal

作　　者：常明 张守玉[1] 黄小河[1] 胡南 江锋浩 李潇峰 刘宏宇 CHANG Ming;ZHANG Shouyu;HUANG Xiaohe;HU Nan;JIANG Fenghao;LI Xiaofeng;LIU Hongyu(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Yangpu Distinct,Shanghai 200082,China;Changchun Institute of Technology,Changchun 130012,Jilin Province,China;Department of Chemistry,Southern University of Science and Technology,Shenzhen 518000,Guangdong Province,China.)

机构地区：[1]上海理工大学能源与动力工程学院,上海市杨浦区200082 [2]长春工程学院,吉林省长春市130012 [3]南方科技大学化学系,广东省深圳市518000

出　　处：《中国电机工程学报》2020年第16期5248-5254,共7页Proceedings of the CSEE

摘　　要：燃用高钠煤锅炉沾污结渣极其严重,极大地限制了高钠煤的燃烧利用及开发。为探索高钠煤煤灰对气态含钠化合物的捕获能力,研究哈密煤煤灰及五彩湾煤煤灰燃烧过程中对氯化钠的捕获性能。通过电感耦合等离子体发射光谱仪(Inductively coupled plasma optical emission spectrometer,ICP-OES)分析钠捕获实验前后高钠煤煤灰样品中钠含量变化进行钠捕获性能研究,并结合X射线衍射仪(X-rays diffraction,XRD)研究煤灰中矿物成分在钠捕获过程中的演变规律以探究煤灰的钠捕获机制。研究发现哈密煤煤灰在810℃时钠捕获能力较强,可通过物理吸附与化学反应固定NaCl蒸气。随着温度的增加H-900的物理吸附能力降低且会向环境中释放自身所含有的钠,导致其钠捕获能力下降。五彩湾煤煤灰中硅铝含量低而钙镁含量高,无法有效地通过化学反应和物理吸附固定NaCl蒸气,W-900处于钠饱和状态,不具备降低烟气中气态含钠化合物含量的能力。The fouling and slagging of boilers burning sodium-rich coal is extremely serious, which greatly limits the combustion, utilization and development of sodium-rich coal. In order to explore the capturing performance of sodium-rich coal ash for the sodium chloride in the flue gas, the sodium-capturing capacity of Hami coal ash and Wucaiwan coal ash was investigated. Inductively coupled plasma optical emission spectrometer(ICP-OES) was used to analyze the changes of the sodium content of the samples before and after the sodium-capturing experiment. To explore the sodium-capturing mechanism of the coal ash, the evolution rule of the mineral components during the sodium-capturing process of the coal ash was investigated using X-rays diffraction(XRD). The results indicate that Hami coal ash shows good sodium-capturing performance at 810℃, the coal ash can capture sodium chloride vapor by physical adsorption and chemical reaction. With the increase of temperature, the physical adsorption capacity of H-900 decreases, and the sodium contained in H-900 will be released to the environment, resulting in the decrease of its sodium-capturing capacity. Wucaiwan coal ash has low silicon aluminum content and high calcium magnesium content, so it is unable to capture chloride vapor effectively through chemical reaction and physical adsorption. Wucaiwan coal ash is in a state of sodium saturation, so it has no ability to reduce the content of gaseous sodium compounds in the flue gas.

关 键 词：高钠煤 煤灰 钠捕获 燃烧 沾污结渣 

分 类 号：TK6[动力工程及工程热物理—生物能]