摘要
我国高灰熔点煤占煤炭储量的57%左右,直接用于气流床气化时将面临"积灰和堵渣"的问题,探索高灰熔点煤灰熔融特性的调控方法对气流床的稳定运行意义重大。主要分析了助熔剂和配煤对灰熔融温度的影响规律;并从矿物质演变机理的角度综述了助熔剂(Fe2O3,Ca O,Mg O,Na2O,K2O和复合助熔剂)、配煤和软件分析(FactSage软件热力学计算和Gaussian量子化计算)如何分析和实现高灰熔点煤灰熔融特性的可控调整;最后阐述了采用支持向量机进行煤灰熔融温度的预测存在精度高的优势。提出了寻找新型助熔剂以增强灰熔融温度调控的准确性和基于支持向量机模型建立煤灰成分与灰熔融温度的关联式,进而指导和优化气化配煤煤种和比例的选择,为高灰熔点煤的清洁高效利用提供理论支持。
The coal with a high ash melting point accounts for about 57% of the coal reserves in China. It would face the problem of ＂ash deposit fouling and slagging＂ when it is directly used for entrained-bed gasification. Exploring the adjustments of ash melting characteristics for the coal with a high ash melting point is of great significance to the stable operation for entrained-bed gasifier. The influence rules of flux and coal blending on the ash melting temperature were analyzed. A review on how to realize the controllable adjustment of ash melting characteristics was given from three aspects including fluxes （Fe2O3, CaO, MgO, Na2O, K2O and complex flux） , coal blending, and software analysis （thermodynamics calculation of FaetSage and quantization calculation of Gaussian） based on the viewpoints of mineral evolution mechanism. Finally the advantage of high precision on predicting coal ash melting temperature on the basis of support vector machine was discussed. Furthermore, some suggestions were given on looking for new flux to improve the stability of changing the ash melting temperature and establishing a relationship between ash composition and ash melting temperature based on support vector machine to guide and optimize the choice of blending coal and the ratio, thus providing the theoretical support for the clean and efficient utilization of coal with a high ash melting point.
出处
《化学工程》
CAS
CSCD
北大核心
2015年第3期60-63,78,共5页
Chemical Engineering(China)
基金
中国科学院战略性先导科技专项(XDA07050103)
煤炭转化国家重点实验室开放项目(J12-13-102)
关键词
灰熔融特性
助熔剂
配煤
可控调整
ash mehing characteristics
flux
blending coal
controllable adjustment
