Experimental Study on Product Characteristics of Typical Pulverized Coal Preheated by a Self-Preheating Burner  

作　　者：ZHANG Jinyang OUYANG Ziqu DING Hongliang SU Kun 

机构地区：[1]Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,Zhenjiang 212013,China [2]Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China [3]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Thermal Science》2023年第5期1912-1934,共23页热科学学报（英文版）

基　　金：supported by CAS Project for Young Scientists in Basic Research(YSBR-028);Strategic Priority Research Program of the Chinese Academy of Sciences(XDA21040100);Youth InnovationPromotion Association of the Chinese Academy of Sciences(2019148)。

摘　　要：As the major primary energy source in China,coal has been proved to be capable to improve its physical and chemical characteristics by the pretreatment of the self-preheating burner.In this study,the effects of altering operating conditions including preheating temperature(T_(p))and primary air equivalence ratio(λ_(p))on preheating characteristics of three typical pulverized coal were investigated on a bench-scale test rig.The high-temperature coal gas compositions along the axis of the riser and at the outlet of the self-preheating burner were measured,and the coal char and coal tar produced in the preheating process were collected and analyzed separately.The results indicated that with the significant release of volatile and the occurrence of chemical reactions,cracks and micropores emerged on the surface of the particles,making the pore structure on the surface more developed,and T_(p)had the most significant effect on the structure of coal particles.Additionally,there were evident differences in the corresponding operating conditions when the preheating characteristics of the three typical coal reached optimally.And preheating had the strongest influence on the degree of anthracite modification.With respect to coal tar,the increase of T_(p)andλ_(p)further promoted its secondary cracking and oxidation,resulting in a decrease in production yield.In this study,for bituminous coal and lignite,a large amount of coal tar were produced during preheating and the highest production yields could reach 5.74%and 6.15%,respectively.While for anthracite,the production yield was intensely low due to its own coal properties,all below 1.02%.

关 键 词：self-preheating fuel modification product characteristics coal particle structure coal tar 

分 类 号：TQ531[化学工程—煤化学工程] TK223.23[动力工程及工程热物理—动力机械及工程]