摘要
建立了基于Ca循环的生物质气化制氢模型,包括气化单元和燃烧单元.气化单元包括热解与重整2个模块,通过快速热解试验获得初始热解模块的结果,并进行了压力和温度的修正计算;通过调整二次热解时进入燃烧炉的焦炭量,使得燃烧炉能够达到煅烧碳酸钙的温度,剩余焦炭进入气化炉;重整模块以及燃烧单元采用Gibbs自由能最小化原理进行计算.通过控制气化反应平衡趋近温度得到系统加压时非平衡态工况的结果,并与气化炉试验结果进行了对比验证.考察了压力、温度、n(Ca)/n(C)和n(H2O)/n(C)对氢气体积分数与产量、碳酸化率和碳酸钙煅烧率等的影响.通过优化,得到了最优的氢气产量为106.4g/kg,体积分数可达94.0%.
A model was developed for hydrogen production by biomass gasification based on Ca-looping,including a gasification and a combustion process.The gasification process consists of a pyrolysis and a reforming module,and the yield of each initial pyrolysis product was determined based on the results of rapid pyrolysis experiments in consideration of pressure and temperature effects.A part of char produced in secondary pyrolysis was fed into the combustor so as to achieve the calcination temperature of calcium carbonate,and the remaining char was sent to the gasifier.Calculations in reforming module and combustion process were based on Gibbs free energy minimization approach.Simulation results of the system in non-equilibrium state during pressurization process were obtained by controlling the temperature approach in restricted equilibrium state,which were subsequently verified with experimental results of gasifiers.Influences of following factors on hydrogen volume fraction and yield,carbonation reaction rate and calcination ratio of calcium carbonate were analyzed,such as the pressure,temperature,n（Ca）/n（C） and n（H2O）/n（C）,etc.Results show that an optimal hydrogen output of 106.4 g/kg can be obtained,with a volume fraction reaching 94.0 ％,after optimization of the system.
出处
《动力工程学报》
CAS
CSCD
北大核心
2013年第11期883-889,共7页
Journal of Chinese Society of Power Engineering
基金
中美清洁能源联合研究中心(CERC)洁净煤联盟合作项目(2010DFA72730-202)
教育部新世纪优秀人才支持计划资助项目(NCET-09-0696)
关键词
生物质
Ca循环
加压气化
制氢
模拟
优化
biomass
Ca-looping
pressurized gasification
hydrogen production
simulation
optimization
