排序方式: 共有5条查询结果,搜索用时 15 毫秒
1
1.
2.
燃煤过程中碱金属迁移规律的模拟研究与预测分析 总被引:4,自引:0,他引:4
基于ASPEN PLUS 平台,对燃煤过程中碱金属迁移规律进行了模拟研究和预测。模拟结果表明,在850K~1650K气态碱金属物质随反应温度的升高而增加;1400K以下,气相中以NaCl、KCl为主,Na2SO4蒸气量明显高于K2SO4;1500K以下,气态碱金属释放量随着煤中氯质量分数的增加而增加;一定温度下,气态碱金属质量分数随压力的升高而降低;常压下煤中氯的质量分数0.1%,温度降到972K时气态碱金属的质量分数可降到2.4×10-8;而当氯的质量分数分别为0.05%和0.01%时,为达到同样的气态碱金属质量分数,温度需分别降到990K和1025K。模拟结果为燃煤联合循环发电系统的设计和优化提供了参考依据。 相似文献
3.
4.
A process economic approach to develop a dilute-acid cellulose hydrolysis process to produce ethanol from biomass 总被引:10,自引:0,他引:10
Successful deployment of a bioethanol process depends on the integration of technologies that can be economically commercialized.
Pretreatment and fermentation operations of the traditional enzymatic bioethanol-production process constitute the largest
portion of the capital and operating costs. Cost reduction in these areas, through improved reactions and reduced capital,
will improve the economic feasibility of a large-scale plant.
A technoeconomic model was developed using the ASPEN PlusTN modeling software package. This model in cluded a two-stage pretreatment operation with a co-current first stage and countercurrent
second stage, a lignin adsorption unit, and a cofermentation unit. Data from kinetic modeling of the pretreatment reactions,
verified by bench-scale experiments, were used to create the ASPEN Plus base model. Results from the initial pretreatment
and fermentation yields of the two-stage system correlated well to the performance targets established by the model. The ASPEN
Plus model determined mass and energy-balance information, which was supplied, to an economic module to determine the required
selling price of the ethanol. Several pretreatment process variables such as glucose yield, liquid: solid ratio, additional
pretreatment stages, and lignin adsorption were varied to determine which parameters had the greatest effect on the process
economics. Optimized values for these key variables became target values for the bench-scale research, either to achieve oridentify
as potential obstacles in the future commercialization process. Results from this modeling and experimentation sequence have
led to the design of an advanced two-stage engineering-scale reactor for a dilute-acid hydrolysis process. 相似文献
5.
1