论文部分内容阅读
为研究床温对糠醛渣流化床燃烧中碱金属析出迁移特性的影响,在小型鼓泡流化床试验台上以糠醛渣为原料进行不同温度(750、800、850、900℃)下的燃烧试验,试验后采用ICP-OES测定各工况下的床料和飞灰中碱金属K的份额,并结合糠醛渣原料中的K的份额,计算气相中K的份额。结果表明:在所研究的床温范围内,K主要存在于气相中。随床温的升高,气相和床料中K的份额均升高,并且在750~800℃之间气相有较大幅度的升高,而在飞灰中的份额会降低。通过对试验后糠醛渣灰的X射线衍射(XRD)分析表明,不同床温下K在床料、飞灰和气相中的份额不同的根本原因在于,灰中钾盐存在的形式不同,750℃为KCl,800℃为KCl和K_2SO_4的混合物,800℃以上则为含碱金属K的复杂硅酸盐。
In order to study the influence of bed temperature on the precipitation and transport of alkali metals in the fluidized bed combustion of furfural slag, furfural residue was used as raw material in a small bubbling fluidized bed test bed to test the effects of different temperature (750,800,850,900 ℃) After the test, the content of K in the bed material and the fly ash in each condition was measured by ICP-OES, and the K content in the gas phase was calculated by combining the share of K in the raw material of furfural residue. The results show that K is mainly present in the gas phase in the investigated bed temperature range. With the increase of the bed temperature, the proportion of K in the gas phase and the bed material all increased, and the gas phase increased sharply between 750 and 800 ° C, while the share in the fly ash decreased. X-ray diffraction (XRD) analysis of the furfural residue ash showed that the difference of K in bed material, fly ash and gas phase at different bed temperatures is due to the different forms of potassium salt present in the ash, 750 ℃ KCl, 800 ℃ for KCl and K_2SO_4 mixture, 800 ℃ above is a complex containing alkali metal K silicate.