高碱煤熔渣捕捉钠的核磁共振研究  

Nuclear Magnetic Resonance Study on Sodium Capture in High Alkali Coal Slag

作　　者：周小粮 胡兴雷 孙叶柱 张忠孝[1] 范浩杰[1] 李辉[2] ZHOU Xiaoliang;HU Xinglei;SUN Yezhu;ZHANG Zhongxiao;FAN Haojie;LI Hui(School of Mechanical and Power Engineering,Shanghai Jiaotong University.Shanghai 200240,China;Huaneng Power Int’l Inc,Beijing 100031,China)

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]华能国际电力股份有限公司,北京100031

出　　处：《锅炉技术》2022年第1期1-7,共7页Boiler Technology

基　　金：国家重点研发计划课题(2018YFB0604101)。

摘　　要：准东煤是良好的动力用煤且储量巨大,但碱金属含量过高导致沾污结渣严重。提出液态排渣的方式捕捉煤中碱金属的思路。采用模拟煤灰(SiO_(2)-Al_(2)O_(2)-Fe_(2)O_(2)-CaO-NaCl)代替准东煤灰进行熔融试验,并对样品进行固体核磁共振测试与物相分析,探究煤灰主要成分对Na捕捉率的影响,并结合熔渣结构的变化分析捕捉机理。研究结果表明:Na被捕捉后进入到熔渣的Si-Al网状结构中;煤灰中Si和Al含量越多,Na的捕捉越高;Ca与Na争夺Si-Al网状结构中的配位,对Na捕捉起抑制作用;Si/Al比越高时,Na的捕捉率越高。Zhundong coal is a high-quality power coal with huge reserves, but its alkali metal content is too high, which leads to serious ash fouling and slagging problems. A scheme has been proposed to capture alkali metal in coal by liquid slag discharge. In this paper, simulated coal ash(SiO_(2)-Al_(2)O_(2)-Fe_(2)O_(2)-Cao-NaCl) was used to replace Zhundong coal ash for melting test. The samples were tested by nuclear magnetic resonance(NMR) and inductive coupled plasma(ICP) to explore the effect of main components on the Na capture rate, and combined with the change of slag structure, the capture mechanism was analyzed. The results show that Na enters into the Si-Al network structure of slag after being captured;the more Si and Al content in coal ash, the higher the capture rate of Na;Ca competes with Na for the coordination in Si-Al structure, which inhibits the capture of Na;the higher the Si/Al ratio, the better the capture effect of Na.

关 键 词：高碱煤 钠捕捉 核磁共振 熔渣结构 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]