摘要
针对影响煤层气与煤矸石循环流化床内混合高效燃烧关键因素(混烧比R、二次风率r2、过量空气系数α)进行试验,研究这3种运行参数对炉内温度场以及燃烧效率的影响.试验结果表明:与纯烧煤矸石相比,采用煤层气/煤矸石混烧可使炉内温度场分布更加均匀,提高燃烧效率.当混烧比R=0.2时,炉内温度场比较均匀,燃烧效率相对较高;随着r2的增加,燃烧效率先升高后降低;随着过量空气系数α增大,炉膛密、稀相区的温度均降低,燃烧效率先升高后降低.在本试验条件下,R=0.2,r2=0.3,α=1.3综合燃烧效果较好.
The co-combustion test of coal-bed gas and coal gangue were performed in circulating fluidized bed （CFB）, the studies about bed temperature field and combustion efficiency were done when the test parameters including the gas/gangue mixing rations （R） , second air rate （r2 ） and excess air coefficient （α） were different. The results show that the co-combustion has an important effect on the combustion optimization, compared with com- bustion of coal gangue only, the distribution of bed temperature becomes well-proportioned and the combustion effi- ciency increases when the coal-bed gas has been mixed. The combustion efficiency is higher when the gas/gangue mixing rations is 0. 2. The second air rate and the excess air coefficient have different effect on temperature in dense bed and dilute phase region, but both parameters have an optimum value corresponding to the highest combustion efficiency. With the increase of the second air rate, the combustion efficiency increases firstly and then reduces. With the increase of excess air coefficient, the temperature in dense bed and dilute phase region fall, the combustion efficiency increases firstly and then reduces. The integrated combustion effect is more preferable when R = 0. 2, r2 = 0. 3 and α = 1.3.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2009年第10期1374-1378,共5页
Journal of China Coal Society
基金
重庆市产业技术研究与开发项目(07-2-177)
关键词
煤层气
煤矸石
循环流化床
混烧
温度场分布
燃烧效率
coal-bed gas
coal gangue
circulating fluidized bed （ CFB ）
co-combustion
distribution of bedtemperature
combustion efficiency
