不同温度下几种合成气成分的层燃速度峰值研究

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
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引用次数: 0

摘要

在当前能源转型的背景下,使用生物质合成气(BDS)通常被认为是减少对化石燃料依赖和温室气体排放的根本途径。然而,含氢 BDS 容易出现火焰不稳定问题。目前正在开展更多工作,旨在通过探索燃烧速度的准确知识,在工业燃烧器中有效地采用 BDS,并辅以 CH4 燃烧或惰性气体稀释。为此,必须对合成气燃烧行为有更深入的了解。本研究的目标与这一框架相吻合:特别是,通过计算研究来评估动力学模型,并就 CO/H2、CO/H2/CO2 和 CO/H2/CH4 等不同合成气混合物对层流燃烧速度(LBV)和 LBV 峰值位置(ΦLBV=max)的影响提出新的见解。利用开源 CANTERA 求解器,系统地对等摩尔(CO: H2 = 1:1)林业废料合成气进行了详细的化学动力学模拟。采用了三种详细的动力学模型,即新发布的 FFCM-2、USC mech II 和改进的 GRI mech III,以报告 1 巴和不同温度水平(从 300 K 到 450 K)下的精确火焰参数。将结果与实验结果相比较,FFCM-2 被证明是一个很好的动力学模型,适用于所考虑的 CO/H2、CO/H2/CO2 合成气混合物,特别是在 0.4 ≤ Φ ≤ 2.1 的常温和适度高温条件下 CO/H2/CH4 混合物(甲烷含量为 30%)。USC mech II 在 CO/H2 和 CO/H2/CO2 方面表现出色,而修改后的 GRI mech III 模型也对富含甲烷的 CO/H2/CH4 混合物进行了预测。此外,在不同温度下进行不同合成气成分分析时,二氧化碳的逐步稀释和高达 30% 的 CH4 添加降低了峰值 LBV,并将峰值 LBV 位置(ΦLBV=max)向贫ER 条件移动,分别降低了 9% 和 40%;然而,只有后者在初始温度升高时才会增强。此外,报告还对正常温度和升高温度下的各种合成气混合物进行了敏感性分析,以探索相对于 LBV 最敏感的中间反应。枸杞多糖峰值位置的移动及其在高温下的增强也为研究对火焰模式/机制和结构的潜在影响开辟了道路,尤其是在添加了 30% CH4 和 CO2 的合成气中的 CO 排放途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study of peak Laminar Burning Velocity of several syngas compositions at different temperatures

In the context of the current energy transition, the use of biomass-derived syngas (BDS) is often recognized as a fundamental path towards decreasing fossil fuel dependency and greenhouse gas emissions. However, hydrogen-containing BDS are prone to flame instability problems. More efforts are being carried out aiming at efficiently adopting BDS in industrial combustors with CH4 co-firing or inert gas dilutions by exploring accurate knowledge of burning velocity. To do so, a deeper knowledge of the syngas combustion behaviour is strictly necessary. The objective of this study fits in this framework: in particular, a computational study has been carried out to evaluate kinetic models and present fresh insights on the effects of varying syngas mixtures such as CO/H2, CO/H2/CO2 and CO/H2/CH4 on Laminar Burning Velocity (LBV) and peak LBV location (ΦLBV=max). In-detail chemical kinetic simulations of equimolar (CO: H2 = 1:1) forestry waste syngas were systematically carried out taking advantage of the open-source CANTERA solver. Three detailed kinetic models i.e., newly released FFCM-2, USC mech II, and modified GRI mech III were implemented to report accurate flame parameters at 1 bar and different temperature levels (from 300 K up to 450 K). On comparing the results with experiments, FFCM-2 proved to be a good kinetic model for the considered syngas mixtures CO/H2, CO/H2/CO2 and especially for CO/H2/CH4 for mixtures containing a limited share of 30 % methane at normal and moderately elevated temperature at 0.4 ≤ Φ ≤ 2.1. The USC mech II performed very well for CO/H2, and CO/H2/CO2, while the modified GRI mech III model also gave agreeable predictions for CO/H2/CH4 mixture having rich methane content. Additionally, when varying syngas composition analysis was conducted at different temperatures, the progressive CO2 dilution and CH4 addition of up to 30 % reduced the peak LBV and moved the peak LBV locations (ΦLBV=max) towards lean ER conditions with 9 % and 40 % reductions, respectively; however, only the latter effect was enhanced at the elevated initial temperature. Furthermore, sensitivity analysis of respective syngas mixtures is reported at normal and elevated temperatures to explore the most sensitive intermediate reactions relative to LBV. The shift of peak LBV locations and their enhancement at elevated temperatures also open the research path to study the underlying impacts on the flame modes/regimes and structure, especially CO emissions pathways in syngas with 30 % of CH4 and CO2 additions.

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来源期刊
Journal of The Energy Institute
Journal of The Energy Institute 工程技术-能源与燃料
CiteScore
10.60
自引率
5.30%
发文量
166
审稿时长
16 days
期刊介绍: The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.
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