摘要
该文利用Aspen Plus软件对农林废弃生物质固定床气化、经甲醇制备低碳烯烃工艺路线进行了系统综合模拟,以研究生物低碳烯烃系统的物质和能量转化效果。以生成1t低碳烯烃的生物质原料消耗量RF、耗水量RH2O和耗电量Relec及低碳烯烃能量效率和系统总能量效率ηole和ηT等为性能评价指标,重点分析了气化水蒸气及富氧气与原料质量比(S/B和O/B)、合成气氢碳比和甲醇合成平衡温度等系统参数对系统性能的影响。并运用基于低位热值的能量分析方法,对优化条件下系统的物质和能量转化进行分析评价。结果表明:在S/B=0.26,O/B=0.14,合成气氢碳比为2.0和合成甲醇温度为245℃下,低碳烯烃制备系统性能较优,RF、RH2O、Relec、ηole和ηT分别为7.86t/t、15.9t/t、4.12MWh/t、40.7%和43.0%。系统可实现电力自供,系统耗水主要用于补充冷却塔空气带出的蒸发水。系统能量损失主要来源于空冷换热、冷却塔蒸发散热及排空尾气,占生物质原料能量的24.1%。
Light olefins, represented by ethylene and propylene, are important platform compounds. At present, naphtha and natural gas are the main raw materials for the production of light olefins. The use of agricultural and forestry waste from lignocellulosic biomass can be an alternative supplement to produce renewable light olefins, considering the limited fossil resources and restricted environmental legislation. In this paper, the process simulation of light olefin production by gasification of agricultural and forestry waste biomass, methanol synthesis and the following step of methanol to olefins was modeling. And the material and energy consumption of the process was analyzed and optimized in this context. Aspen Plus software was applied for process modeling. The integrated process included several main sections, of which were O2-steam gasification of wood chips, reforming of raw fuel gas, adjustment of fuel gas composition (sulfur removal, water-gas shift reaction, pressure-swing CO2 adsorption), methanol synthesis and separation, light olefin production from methanol, waste heat utilization, boiler and steam turbine, cooling tower. The effect of main operation parameters on process performance was investigated, including the weight ratios of steam to biomass and O2-rich gas to biomass (S/B and O/B), H2 to CO ratio of syngas (H2/COsyngas), and reaction temperature of methanol synthesis. The evaluation index were feedstock usage (RF), water usage(RH2O), electricity usage(Relec), light olefin efficiency (ηole) and total energy efficiency(ηT), et al. Potential energy method, based on low heating values of the streams, was adapted for the analysis and evaluation of energy conversion of the process under different operation conditions. The results show that RF of 7.86 t/t, RH2O of 15.9 t/t, Relec of 4.12 MWh/t,ηole of 40.7% and ηT of 43.0% were obtained under the optimized process parameters, which was at S/B=0.26, O/B=0.14, H2/COsyngas and methanol synthesis temperature of 245 ℃. Self-supply of electricity was
作者
李茜
李宇萍
张兴华
陈伦刚
王晨光
马隆龙
Li Xi;Li Yuping;Zhang Xinghua;Chen Lungang;Wang Chenguang;Ma Longlong(CAS Key Laboratory of Renewable Energy,Guangzhou 510640,China;Guangzhou Institute of Energy Conversion,ChineseAcademy of Sciences,Guangzhou 510640,China;Guangdong Provincial Key Laboratory of New and Renewable Energy Research andDevelopment,Guangzhou 510640,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2019年第18期211-219,共9页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金项目(51776205)
广东省科技计划项目(2016A050502037)
湖南省科技重大专项项目(2017NK1010)
关键词
废弃物
甲烷
制备低碳烯烃
物质和能量分析
系统模拟优化
residues
methane
light olefin production
mass and energy analysis
process simulation and optimization
