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以化学热力学平衡计算为基础,利用自行设计的立式管式炉结合X射线衍射(X-ray power diffraction,XRD)、扫描电子显微镜(scanning election microscope,SEM)等分析测试手段探讨稻秆与煤在850℃的条件下混合燃烧碱金属K、Na的迁移转化规律。结果表明,碱金属的主要气态组元KCl、KOH、NaCl、NaOH随稻秆含量的增多而增加,且氯化物的析出量大于氢氧化物的析出量;煤中某些矿物组分或元素对K的气相析出有抑制作用,但对Na的抑制作用不明显;灰中K、Na的存在形式直接受原料秸秆含量的影响,稻秆含量为0%和20%时,灰中K以K2O Fe2O3为主,Na则以Na2SO4为主,稻秆含量大于50%时,K2O 2SiO2、Na2SiO3随稻秆含量的增多表现出上升趋势,K2SO4、Na2SO4趋势则相反,原料K还会以KAlSiO4、KAlSi3O8的形式滞留在灰中。
Based on the chemical thermodynamic equilibrium calculation, the vertical tube furnace designed by ourselves was analyzed by X-ray diffraction (XRD) and scanning election microscope (SEM) Under the conditions of 850 ℃ mixed combustion of alkali metals K, Na migration and transformation rules. The results showed that KCl, KOH, NaCl and NaOH, the main gaseous components of alkali metals, increased with the increase of rice straw content, and the amount of chloride precipitation was greater than the amount of hydroxide precipitation. Some mineral components or element pairs in coal However, the inhibitory effect on Na was not obvious. The forms of K and Na in ash were directly affected by the content of raw straw. When the content of rice straw was 0% and 20%, the content of K in the ash was K2O Fe2O3 , While Na is mainly Na2SO4. When the content of rice straw is more than 50%, K2O 2SiO2 and Na2SiO3 show an upward trend with the increase of rice straw content, but the trend of K2SO4 and Na2SO4 is opposite. K is also KAlSiO4 and KAlSi3O8 Stranded in the ash.