固钠剂对NaCl蒸气的钠捕获性能研究  

Study on the Sodium Capture Performance of Sodium Adsorbent for NaCl Vapor

作　　者：黄东东 张守玉[1] 江锋浩 常明 张华[3] 吴玉新[4] 吕俊复[4] 胡南 HUANG Dongdong;ZHANG Shouyu;JIANG Fenghao;CHANG Ming;ZHANG Hua;WU Yuxin;LYU Junfu;HU Nan(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Yangpu District,Shanghai 200093,China;Department of Chemistry,Southern University of Science and Technology,Shenzhen 518000,Guangdong Province,China;Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering(University of Shanghai for Science and Technology),Yangpu District,Shanghai 200093,Ghina;Department of Thermal Engineering,Tsinghua University,Haidian District,Beijing 100084,China;Changchun Institute of Technology,Changchun 130012,Jilin 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200093 [2]南方科技大学化学系,广东省深圳市518000 [3]上海市动力工程多相流动与传热重点实验室(上海理工大学),上海市200093 [4]清华大学热能工程系,北京市100084 [5]长春工程学院,吉林省长春市130012

出　　处：《中国电机工程学报》2021年第21期7403-7409,共7页Proceedings of the CSEE

基　　金：国家自然科学基金重点国际(地区)合作研究项目(51761125011)。

摘　　要：中国新疆的准东煤具有重要开发利用价值,但准东煤的钠含量高,在其燃烧过程中产生大量的气态含钠化合物进入烟气中,冷凝于受热面上,造成严重的沾污结渣问题。固钠剂可有效降低高钠煤燃烧后烟气中气态含钠化合物的浓度从而降低沾污结渣趋势。研究选用高岭土、二氧化硅及膨润土作为原料,以NaCl为钠蒸气源在反应温度810~1000℃间进行钠捕获实验。利用热重分析、X-射线衍射分析和电感耦合等离子原子发射光谱分析研究了样品的热稳定性及实验过程的矿物质成分和钠含量前后发生的变化,分析和讨论了高岭土、二氧化硅及膨润土的钠捕获性能和机制。研究发现在810~1000℃间膨润土的钠捕获性能最佳,高岭土次之,二氧化硅最差。膨润土的钠捕获量随反应温度升高而逐渐增加。810℃和900℃下高岭土的钠捕获量几乎不变,但当温度由900℃增加至1000℃时,其钠捕获性能增加显著。二氧化硅通过物理吸附与化学反应固定NaCl蒸气,在900℃时表现出一定钠捕获性能,但随温度继续增加,其钠捕获能力下降。Zhundong coal of China has important development and utilization value.However,because of the high sodium content of Zhundong coal,a large amount of gaseous sodium-containing compounds produced during its combustion process of Zhundong coal condenses onto the heating surface,and results in serious fouling and slagging problems.The content of the gaseous sodium-containing compounds in the flue gas can be effectively reduced by the sodium adsorbent.The three sodium adsorbents(kaolinite,SiO2 and bentonite)were selected as the raw material for the sodium-capturing experiment.NaCl was used as sodium vapor source,and sodium-capturing experiment device was used to conduct sodium-capturing experiment under the reaction temperature range of 810~1000℃.Thermogravimetric analysis(TG)was used to study the thermal stability of the samples.The main crystalline compounds were identified by X-ray diffraction analysis(XRD).The sodium content of the sample before and after the sodium-capturing experiment was determined by inductively coupled plasma atomic emission spectrometry(ICP-OES).The results found that the amount of the sodium captured by the adsorbents was in the order of bentonite>kaolin>SiO_(2),between 810°C and 1000℃.The sodium-capturing amount of bentonite gradually increased with the increase of reaction temperature.As the reaction temperature increased from 810℃to 1000℃,the sodium-capturing amount of kaolin changed a little as the result of the increasing chemical reaction rate,and the decreasing number of active sited on the surface of kaolin.But the sodium-capturing performance increased significantly when the temperature increased to 1000℃.SiO2,which could fix a certain NaCl vapor through physical adsorption and chemical reaction at 900℃,showed the decreasing performance when the temperature above 900℃.

关 键 词：高钠煤 煤燃烧 气态含钠化合物 沾污结渣 固钠剂 钠捕获 

分 类 号：TK6[动力工程及工程热物理—生物能]