摘要
煤泥和污泥颗粒具有高黏度和高含水量的特点,直接作为燃料掺烧容易引起输煤线堵塞、锅炉燃烧效率降低、排烟量增加等问题。为解决循环流化床锅炉掺烧湿煤泥、污泥影响锅炉稳定运行的问题,设计并应用了太阳能+余热干化的高水分燃料立体式干化系统,该系统可按功能划分为太阳能干化系统、热水系统、热风系统和除臭系统4部分。干化温室顶部整体利用太阳能辐射,中部利用空压机热风循环扰动,底部利用低温省煤器和烟气脱白系统的热水进行烘干,并定期对物料连续翻动,以实现湿煤泥、污泥高效干化。干化系统投运后,年均烘干湿煤泥、污泥总量10万t以上,煤泥含水率由30%降至约15%,污泥含水率由70%降至约30%,年经济收益达400万元以上。湿物料经干化脱水达标后即送入锅炉焚烧发电,环境、社会效益显著。
Coal slurry and sludge particles have the characteristics of high viscosity and high water content.Di⁃rectly co firing them as fuel can easily cause problems such as coal pipe blockage,reduced boiler combustion effi⁃ciency,and increased smoke exhaust.To solve the problem of mixing wet coal slurry and sludge in circulating fluidized bed(CFB)boilers affecting the stable operation of the boiler,a high moisture fuel stereo dryization system with solar energy and remaining heat drying was designed and applied.The system can be divided into four parts according to function:solar drying system,hot water system,hot air system,and deodorization sys⁃tem.The top of the drying greenhouse adopts solar radiation as a whole.The underfloor heating hot water sys⁃tem utilizes the hot water circulation of the low-temperature economizer and the flue gas whitening system.The middle uses an air compressor to cool hot air and circulate hot air disturbance.The bottom recovers waste heat from flue gas for drying,and regularly flips the materials to achieve efficient drying of wet coal sludge and sludge.After the project is put into operation,the average annual dry wet coal slurry and total amount of sludge will be over 100000 t.The moisture content of coal slurry will be reduced from 30%to about 15%,and the moisture content of sludge will be reduced from 70%to about 30%.The annual economic benefits will reach over 4 million yuan;After the wet materials are dried and dehydrated to meet the standards,they are sent to the boiler for incineration and power generation,which has significant environmental and social benefits.
作者
胡光涛
HU Guangtao(Jiangsu Xukuang Comprehensive Utilization Power Generation Co.,Ltd.,Xuzhou 221000,China)
出处
《电力学报》
2023年第6期541-549,共9页
Journal of Electric Power
关键词
循环流化床锅炉
高水分燃料
立体式干化
余热利用
煤泥
污泥
资源化利用
改造
CFB boiler
high moisture fuel
stereo dryization
remaining heat utilization
coal slurry
sludge
re⁃source utilization
transformation
