Effect of Heat Flux Distribution Profile on Hydrogen Concentration in an Allothermal Downdraft Biomass Gasification Process: Modeling Study

Lenis Yuhan A.; Maag Gilles; Lins de Oliveira Celso Eduardo; Corredor Lesme; Sanjuan Marco

首页> 外文期刊>Journal of Energy Resources Technology >Effect of Heat Flux Distribution Profile on Hydrogen Concentration in an Allothermal Downdraft Biomass Gasification Process: Modeling Study

【24h】

Effect of Heat Flux Distribution Profile on Hydrogen Concentration in an Allothermal Downdraft Biomass Gasification Process: Modeling Study

机译：热流向下分布生物质气化过程中热通量分布曲线对氢浓度的影响：建模研究

获取原文

获取原文并翻译 | 示例

掌桥外文数据库（机构版） >>

开具论文收录证明 >>

文献代查 >>

页面导航

摘要
著录项
相似文献
相关主题

摘要

Considering the potential of using concentrating solar power systems to supply the heat required for the allothermal gasification process, this study analyzes hydrogen production in such a system by assuming typical radiative heat flux profiles for a receiver of a central tower concentrated solar power (CSP) plant. A detailed model for allothermal gasification in a downdraft fixed bed tubular reactor is proposed. This considers solid and gas phases traveling in parallel flow along the reactor. Results for temperature and gas profile show a reasonable quantitative agreement with experimental works carried out under similar conditions. Aiming to maximize H-2 yield, eight Gaussian flux distributions, similar to those typical of CSP systems, each with a total power of 8 kW (average heat flux 20 kW/m(2)), but with varying peak locations, were analyzed. The results show a maximum producer gas yield and a chemical efficiency of 134.1 kmol/h and 45.9% respectively, with a molar concentration of 47.2% CO, 46.9% H-2, 3.3% CH4, and 2.6% CO2 for a distribution peak at z = 1.4 m, thus relatively close to the flue gas outlet. Hydrogen production and gas yield using this configuration were 4% and 2.9% higher than the achieved using the same power but homogeneously distributed. Solar to chemical efficiencies ranged from 38.9% to 45.9%, with a minimum when distribution peak was at the reactor center. These results are due to high temperatures during the latter stage of the process favoring char gasification reactions.

机译：考虑到使用聚光太阳能系统提供地热气化过程所需热量的潜力，本研究通过假设中央塔式聚光太阳能（CSP）装置接收器的典型辐射热通量分布图，分析了该系统中的氢气产生。提出了下沉式固定床管式反应器中变热气化的详细模型。这考虑了沿反应器平行流动的固相和气相。温度和气体分布的结果与在类似条件下进行的实验工作显示出合理的定量一致性。为了最大化H-2产量，分析了八种高斯通量分布，类似于CSP系统的典型分布，每种分布的总功率为8 kW（平均热通量为20 kW / m（2）），但峰位置不同。结果显示最大产生气产量和化学效率分别为134.1 kmol / h和45.9％，摩尔浓度为47.2％CO，46.9％H-2、3.3％CH4和2.6％CO2的分布峰位于z = 1.4 m，因此相对靠近烟气出口。使用这种配置的氢气产量和气体产率分别比使用相同功率但均匀分布的氢气和天然气的产量高4％和2.9％。太阳到化学的效率在38.9％至45.9％的范围内，当分布峰值位于反应堆中心时最低。这些结果归因于在该过程的后期有利于炭气化反应的高温。

著录项

来源
《Journal of Energy Resources Technology》 |2019年第3期|031801.1-031801.10|共10页
作者
Lenis Yuhan A.; Maag Gilles; Lins de Oliveira Celso Eduardo; Corredor Lesme; Sanjuan Marco;
展开▼
作者单位

Univ Norte, Dept Mech Engn, Km 5 Via Puerto Colombia, Barranquilla 081007, Colombia|Inst Univ Pascual Bravo, Dept Mech Engn, Calle 73 73A-226, Medellin 050034, Colombia;

Univ Sao Paulo, Fac Anim Sci & Food Engn, Dept Biosyst Engn, Ave Duque Caxias Norte 225, BR-13635900 Pirassununga, SP, Brazil;

Univ Sao Paulo, Fac Anim Sci & Food Engn, Dept Biosyst Engn, Ave Duque Caxias Norte 225, BR-13635900 Pirassununga, SP, Brazil;

Univ Norte, Dept Mech Engn, Km 5 Via Puerto Colombia, Barranquilla 081007, Colombia;

Univ Norte, Dept Mech Engn, Km 5 Via Puerto Colombia, Barranquilla 081007, Colombia;

展开▼
收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词

相似文献

外文文献
中文文献
专利

1. Modeling of downdraft gasification process: Part Ⅱ - Studies on the effect of shrinking and non-shrinking biomass geometries on the performance of gasification process [J] . Ashish Chaurasia Energy . 2020,第Sepa15期

机译：降下的气化过程建模：第Ⅱ部分 - 对气化过程萎缩和非萎缩生物质几何效果的研究
2. Modeling, simulation and optimization of downdraft gasifier: Studies on chemical kinetics and operating conditions on the performance of the biomass gasification process [J] . Chaurasia Ashish Energy . 2016,第pta1期

机译：下行气流气化炉的建模，模拟和优化：化学动力学和操作条件对生物质气化过程性能的研究
3. Effect of biomass particle size and air superficial velocity on the gasification process in a downdraft fixed bed gasifier.An experimental and modelling study [J] . Francisco V.Tinaut, Andres Melgar, Juan F.Perez Fuel Processing Technology . 2008,第11期

机译：下沉式固定床气化炉中生物质粒径和空气表观速度对气化过程的影响。实验与模型研究
4. Thermodynamic Modeling of Allothermal Steam Gasification in a Downdraft Fixed-bed Gasifier [C] . Wilson B. Musinguzi, Mackay A.E. Okure, Adam Sebbit International Conference on Advanced Material and Manufacturing Science . 2014

机译：降下式固定床气化器中的热力学建模
5. Design, scale-up, Six Sigma in processing different feedstocks in a fixed bed downdraft biomass gasifier [D] . Boravelli, Sai Chandra Teja. 2016

机译：设计，缩放，六西格玛在固定床下加工生物量气化器处理不同的原料
6. Dataset of biomass characteristics and net output power from downdraft biomass gasifier integrated power production unit [O] . Sahar Safarian, Seyed Mohammad Ebrahimi Saryazdi, Runar Unnthorsson, 2020

机译：下降生物量气化器的生物质特性数据集和净输出电源集成电源生产单元
7. This article presents a new numerical model describing the behaviour of a thermally thick wood sample exposed to high solar heat flux (above 1 MW/m2). A preliminary study based on dimensionless numbers is used to classify the problem and support model building assumptions. Then, a model based on mass, momentum and energy balance equations is proposed. These equations are coupled with liquid-vapour drying model and pseudo species biomass degradation model. By comparing to a former experimental study, preliminary results have shown that these equations are not enough to accurately predict biomass behaviour under high solar heat flux. Indeed, a char layer acting as radiative shield forms on the sample exposed surface. In addition to this classical set of equations, it is mandatory to take into account radiation penetration into the medium. Furthermore, as biomass contains water, medium deformation consecutively to char steam gasification must also be implemented. Finally, with the addition of these two strategies, the model is able to properly capture the degradation of biomass when exposed to high radiative heat flux over a range of sample initial moisture content. Additional insights of biomass behaviour under high solar heat flux were also derived. Drying, pyrolysis and gasification fronts are present at the same time inside of the sample. The coexistence of these three thermochemical fronts leads to char gasification by the steam produced from drying of the sample, which it is the main phenomenon behind medium ablation. [O] . Pozzobon, Victor, Salvador, Sylvain, Bézian, Jean Jacques 2018

机译：本文提供了一个新的数值模型，该模型描述了暴露于高太阳热通量（高于1 / MW / m2）的热厚木材样品的行为。基于无量纲数的初步研究用于对问题进行分类并支持模型构建假设。然后，提出了一种基于质量，动量和能量平衡方程的模型。这些方程式与液体蒸汽干燥模型和假物种生物质降解模型耦合。通过与以前的实验研究进行比较，初步结果表明，这些方程不足以准确预测高太阳热通量下的生物量行为。的确，在样品暴露的表面上形成了充当辐射屏蔽层的炭层。除了这套经典的方程式之外，还必须考虑到辐射向介质的渗透。此外，由于生物质中含有水，因此还必须在炭蒸气汽化后进行连续的介质变形。最后，通过添加这两种策略，该模型能够在一定范围的样品初始水分含量下暴露于高辐射热通量的情况下，正确捕获生物质的降解。还得出了在高太阳热通量下生物量行为的其他见解。样品内部同时存在干燥，热解和气化前沿。这三个热化学前沿的共存会导致样品干燥产生的蒸汽产生焦炭气化，这是介质烧蚀的主要现象。

Effect of Heat Flux Distribution Profile on Hydrogen Concentration in an Allothermal Downdraft Biomass Gasification Process: Modeling Study

摘要

著录项

相似文献

相关主题

期刊订阅