白云石添加剂对稻秆灰熔融特性及固钾能力的影响

Influence of dolomite additive on the ash fusion and potassium fixation characteristics of rice straw

在管式炉中研究了稻草秸秆的结渣特性与白云石作为添加剂对稻秆燃烧结渣的影响及其机理。采用电感耦合等离子体发射光谱(ICP-OES)和X射线衍射(XRD)表征了稻秆灰分与白云石之间的相互作用。结果表明,当白云石添加质量分数为5%时,对稻秆的结渣特性具有明显的改善。白云石具有较好的固钾能力,在900和1000℃下尤为明显。白云石中富含的Mg和Ca元素能够与稻秆灰分中的SiO2反应形成高熔点的硅酸盐矿物,包括透辉石、钙镁橄榄石和镁硅钙石。

The influence of dolomite as an additive on the slagging and potassium fixation characteristics of rice straw upon burning was investigated in a tube furnace;the slagging mechanism as well as the interaction between the rice straw ash and dolomite were explored by using the inductively coupled plasma optical emission spectrometry(ICP-OES) and X-ray diffraction(XRD).The results show that the slagging characteristics of rice straw are significantly influenced by adding 5% dolomite.Dolomite can greatly improve the potassium fixation ability,especially at 900-1000℃;moreover,the Mg and Ca elements rich in dolomite can react with SiO2 in the rice straw ash,forming high-melting silicate minerals including diopside,monticellite and merwinite.