煤燃烧过程中铍的迁移转化特性研究

发布时间：2018-01-12 05:22

本文关键词：煤燃烧过程中铍的迁移转化特性研究　出处：《燃料化学学报》2016年06期 　论文类型：期刊论文

【摘要】：通过热力学平衡模拟计算煤燃烧过程中铍的形态转化,采用高温真空管式炉进行含铍化合物与矿物的固固反应实验,以及富铍煤中加入添加剂的燃烧实验,通过X射线衍射仪(XRD)、X射线荧光探针(XRF)以及电感耦合等离子质谱仪(ICP-MS)揭示煤燃烧过程中铍的迁移转化规律。结果表明,模拟计算发现铍只与含铝化合物反应生成BeAl_2O_4和Be Al6O10,同时固固反应实验也印证了这一结论,但反应温度在1 000℃左右,明显高于模拟计算温度650℃。添加Al_2O_3的富铍煤在燃烧时,由于铍与Al_2O_3发生反应,铍的释放率明显降低,最高降低33%以上;添加了伊利石的富铍煤,由于伊利石与铍的反应温度高于Al_2O_3,其抑制作用弱于Al_2O_3;而高岭石由于与铍的反应温度过高,在高岭石与铍发生反应产生抑制效果之前,部分铍已经在燃烧过程中释放出去,因此,抑制效果最差。
[Abstract]:Through the thermodynamic equilibrium calculation of beryllium in coal combustion process transformation, high-temperature vacuum of beryllium containing compounds and mineral solid solid reaction experimental tube furnace, and adding additives be rich coal in combustion experiments by X ray diffraction (XRD), X ray fluorescence probe (XRF) and inductively coupled plasma the mass spectrometer (ICP-MS) to reveal the migration process of beryllium in coal combustion transformation. The results show that the simulation results only with beryllium aluminum compound reaction of BeAl_2O_4 and Be Al6O10, while the solid solid reaction experiment also confirms this conclusion, but the reaction temperature at 1000 degrees Celsius, was significantly higher than that of calculated temperature of 650 degrees Celsius. Add Al_2O_3 the rich coal in the combustion of beryllium, beryllium due to react with Al_2O_3, beryllium release rate decreased significantly, the highest is reduced by more than 33%; adding illite rich coal as the reaction temperature of beryllium, beryllium and illite is higher than that of Al_2O The inhibition effect of _3 is weaker than that of Al_2O_3. However, kaolinite is released due to the reaction of kaolinite and beryllium because of its high reaction temperature with beryllium, so the partial beryllium has been released during combustion, so its inhibition effect is the worst.

【作者单位】：华中科技大学煤燃烧国家重点实验室;
【基金】：国家自然科学基金(51376074) 国家重点基础研究发展规划(973计划,2014CB238904)资助~~
【分类号】：X131
【正文快照】： Received:2015-12-31;Revised:2016-03-15.铍及其化合物无论是以粉尘、烟气或者蒸汽形式被人体吸入时,都会引起上呼吸道系统以及肺部发生病变[1,2]。研究表明,当空气中的铍含量超过25μg/m3,或者长期生活在铍含量超过0.01μg/m3的环境中,都会引起急性铍中毒(铍肺),长期吸入低

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