半焦加压燃烧特性的试验研究  

Experimental Study on Combustion Characteristic of Coal-Chars at Elevated Pressures

作　　者：段钰锋[1] 周毅[1] 

机构地区：[1]东南大学洁净煤发电及燃烧技术教育部重点实验室,南京210096

出　　处：《燃烧科学与技术》2006年第4期353-357,共5页Journal of Combustion Science and Technology

基　　金：国家重点基础研究发展计划(973)资助项目(G199902210532).

摘　　要：半焦加压燃烧是第二代PFBC-CC技术的重要组成部分．分别在实验室规模的喷动流化床和热输入1 MWt中试规模的增压流化床燃烧装置上,进行了系统的半焦加压燃烧特性试验研究．研究结果表明,随系统压力的增加,炉膛温度逐渐升高,半焦燃烧效率也相应增大；在压力接近0．5 MPa时,压力增加,煤的燃烧效率增加减缓,但半焦的燃烧效率仍然增加显著．在较高的系统压力下,压力对燃烧的影响占主导因素；在较低的过量空气系数下半焦燃烧仍能获得较高的燃烧效率．床层温度提高后,燃烧反应速度加快,颗粒燃烧较完全,有利于提高燃烧效率．The re-combustion of gasified coal-chars plays an important role in the second-generation PFBC-CC technologies for pursuing higher overall power generation efficiency. The research on pressurized combustion characteristic of coal-chars were systematically conducted in a bench-scale pressurized spout fluidized bed combustor and the results were fed into a pilot-scale pressurized fluidized bed combustor with heat input of 1 MWt to verify its utility combustion effects. The results show that the combustion temperature and efficiency increase with the increase of the system pressure. When the pressure approached 0. 5 MPa, the combustion efficiency of coal increased slowly but the combustion efficiency of coal-char continued rising. Under operational condition of higher pressure of the test case, the pressure turned to have a dominant effect on the combustion efficiency, and the combustion efficiency could be high with lower excess air coefficient. Higher temperature made the coal-chars burnt completely as a result of speeding up the combustion reactions between air and coal-chars and thus benefited the combustion efficiency.

关 键 词：半焦 加压喷动流化床 加压燃烧 燃烧效率 

分 类 号：TK16[动力工程及工程热物理—热能工程]