油页岩半焦在流化床内的燃烧特性研究  

Study on Combustion Characteristics of Oil Shale Semi-coke in Fluidized Bed

作　　者：洪勇[1] 卢啸风[1] 王泉海[1] 杨宇[1] 

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400044

出　　处：《热能动力工程》2016年第3期92-96,142-143,共5页Journal of Engineering for Thermal Energy and Power

基　　金：中国科学院战略性先导科技专项(XDA07030100)

摘　　要：为了实现油页岩半焦的鼓泡流化床燃烧,构建炉膛尺寸150 mm×150 mm×2 500 mm的流化床试验台,研究了油页岩半焦的燃烧特性和烟气中污染物的排放特性。研究表明:低热值半焦可以在鼓泡流化床中稳定燃烧;随密相区温度的升高,烟气含氧量及燃料停留时间降低,SO_2与NO_x排放浓度增大;床层高度比(指床层高度与炉膛本体高度比)为0.16时,烟气含氧量及燃料停留时间有最大值;密相区温度升至900℃时,飞灰与底渣的含碳量达到稳定值,且飞灰浓度最低;鼓泡流化床燃烧的典型工况:流化风温取400℃,床层高度比取0.16,炉内密相区温度取900℃。In order to achieve the combustion of oil shale semi-coke in the bubbling fluidized bed,the paper built up a fluidized bed test bench with the furnace size of 150 mm × 150 mm × 2 500 mm,and studied combustion characteristics of the oil shale semi-coke as well as the emission characteristics of pollutants in the flue gas. The Study indicates that the semi-coke with low-calorific value can obtain stable combustion in the bubbling fluidized bed. Along with the increase of temperature in dense phase zone,flue gas oxygen content and fuel residence time will decrease and emission concentration of SO_2 and NO_x will increase. The flue gas oxygen content and fuel residence period can reach the maximum value as bed height ratio( the ratio of bed height to furnace body height) being of 0. 16. When temperature in dense phase zone rises to 900 ℃,the carbon contents of fly ash and bottom slag can reach stable values and the concentration of fly ash can get the lowest value. The typical operating conditions for the combustion of bubbling fluidized bed are as follows: the fluidization air temperature is taken as 400 ℃,bed height ratio is taken as0. 16 and the temperature in dense phase zone in furnace is taken as 900 ℃.

关 键 词：低热值 油页岩半焦 鼓泡床 

分 类 号：TK223[动力工程及工程热物理—动力机械及工程]