摘要
为了考察不同浓度的CO2气氛对煤热解特性的影响,该文以陕西榆林烟煤为研究对象,在小型鼓泡流化床上开展实验研究。考察了CO2气氛浓度对半焦、焦油、热解水和热解气体产物产率的影响。另外以600℃为例,考察了CO2气氛对焦油组分、半焦表面官能团、半焦孔隙结构、元素组成和燃烧特性的影响。各温度下,热解产物半焦产率随CO2浓度的提高而降低,在较高温度下（700和800℃）降低作用更明显。当CO2浓度较低（10%）时,焦油产率受其影响不大,继续提高CO2浓度时焦油产率有所提高而热解水产率受CO2浓度的影响较小。热解气中CH4产率随CO2浓度的提高而提高,CO产率受CO2浓度影响在800℃下最为明显。CO2浓度越高H2产率越低,C2-C3气体产率越高。提高CO2浓度能减少焦油中重质组分相对含量,增加酚类的相对含量。半焦表面官能团中,CO2浓度的提高抑制了羰基分解成CO2,—OH伸缩特征峰随CO2浓度的提高而减弱。半焦热重燃烧特性实验表明,随着CO2浓度的提高,半焦的着火温度、最大燃烧速率对应温度以及燃尽温度都有所降低,而较高浓度（40%）下这一作用有所减弱。
Chinese typical bituminous coal（Shaanxi Yulin coal） was pyrolyzed in the atmosphere with various CO2 volume concentration at different temperatures in a small fluidized bed reactor. The influence of CO2 concentration on the yields of char, tar, water and pyrolysis gas was studied. Tar components, functional group of char, combustion characteristic of char obtained under 600℃ were analyzed. Char yield decreases with the increase of CO2 concentration and its effect becomes more obvious at higher temperature（700℃ and 800℃）. Low CO2 concentration（10%） has little effect both on tar yield. When the CO2 concentration is increased, tar yield improves obviously while the water yield is less effected. CH4 and C2~C3 yield improves when the CO2 concentration is elevated while the H2 yield decreases. Increasing the CO2 concentration could decrease the heavy fraction in tar and increase relative contents of phenols. FT-IR spectra of char obtained at 600℃ showed that the peak which represents v（O—H） bond stretching vibrations of hydroxyl groups is enhanced with the increase of CO2 concentration. Thermal Gravity test on the combustion characteristic of char showed that all three characteristic temperatures（ignition temperature, temperature corresponding to maximum combustion rate and burnout temperature） of char decrease first with the elevation of CO2 concentration and this effect become weak in a high CO2 concentration（40%） atmosphere.
作者
穆合塔尔·斯依提
王勤辉
唐健
司文飞
俞利锋
骆仲泱
MUHETAER Siyiti;WANG Qinghui;TANG Jian;SI Wenfeil;YU Lifeng;LUO Zhongyang(State Key Laboratory of Clean Energy Utilization（Zhejiang University）,Hangzhou 310027,Zhejiang Province,China;China Huadian Corporation Zhejiang Company,Hangzhou 310016,Zhejiang Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2018年第13期3881-3888,共8页
Proceedings of the CSEE
基金
国家重点研发计划(2016YFE0102500-05)~~
关键词
CO2气氛
烟煤
流化床热解
产率
产物特性
C02 atmosphere
bituminous coal
fluidized bed pyrolysis
product yield
characteristics
