摘要
为获得硫对水稻秸秆燃烧过程中碱金属钾迁移释放规律的影响,通过在水稻秸秆中加入不同量硫磺,研究硫在不同燃烧温度下对钾的作用规律,利用分级萃取结合电感耦合等离子体发射光谱法(inductivecoupledplasmaatomic emissionspectrometry,ICP-AES)的方式定量测量样品中不同类型的碱金属含量,并采用X射线衍射技术(X-ray diffractiontechniques,XRD)分析添加前后的样品灰中物相变化。结果表明,在标准灰化法815℃下,硫对钾的释放有明显的抑制作用。结合物相分析可知,其主要通过将低熔点挥发性钾转化为硫酸钾形式固定在灰中从而实现释放抑制,此外添加的硫也导致了灰中钾的硅铝酸盐等不溶钾盐含量的下降。改变添加硫与钾的摩尔比可知,在S/K=6时硫的抑制作用达到饱和。上述固定现象与温度密切相关,在400~600℃燃烧温度下,硫对钾不仅没有固定效应,反而促进释放;当燃烧温度大于800℃时,硫开始对钾产生固定效果,并可持续至1200℃。
In order to obtain the effect of sulfur on the migration and release of alkali-metal potassium in the combustion process of rice straw,this paper added different amounts of sulfur into rice straw,used fractional extraction combined with inductive coupled plasma atomic emission spectrometry(ICP-AES)to quantitatively measure the content of different types of alkali metals,and X-ray diffraction techniques(XRD)were used to analyze the phase changes in the ash before and after addition.The results show that sulfur can obviously inhibit the release of potassium at 815℃by standard ashing method.Combined phase analysis shows that the release inhibition is mainly realized by converting low melting point volatile potassium into potassium sulfate and fixing it in ash.In addition,the added sulfur also leads to the decrease of insoluble potassium salt content such as aluminosilicate of potassium in ash.Changing the molar ratio of added sulfur to potassium shows that the inhibition of sulfur reaches saturation when S/K=6.The above fixation phenomenon is closely related to temperature.At the combustion temperature of 400~600℃,sulfur has no fixation effect on potassium,but promotes release.When the combustion temperature is higher than 800℃,sulfur begins to produce a fixation effect on potassium,which can last up to 1200℃.
作者
方璐瑶
刘颖祖
朱燕群
何勇
王智化
FANG Luyao;LIU Yingzu;ZHU Yanqun;HE Yong;WANG Zhihua(State Key Laboratory of Clean Energy Utilization(Zhejiang University),Hangzhou 310027,Zhejiang Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2020年第5期1562-1569,共8页
Proceedings of the CSEE
基金
国家自然科学基金项目(51876192,51776185).
关键词
水稻秸秆
碱金属钾
硫
燃烧
迁移
释放
rice straw
alkali-metal potassium
sulfur
combustion
migration
release
作者简介
方璐瑶(1995),女,硕士研究生,从事单颗粒燃烧及碱金属释放方面研究,21727004@zju.edu.cn;通信作者:朱燕群(1981),女,工程师,从事燃煤污染物检测及控制研究,yqzhu@zju.edu.cn。
