二甲醚和氢气混合燃料预混火焰中的可用能损失

doi:10.1007/s11708-019-0645-8

Frontiers in Energy

2019, Vol. 13

Issue (4): 658-666 https://doi.org/10.1007/s11708-019-0645-8

研究论文

本期目录

二甲醚和氢气混合燃料预混火焰中的可用能损失

赵同宾¹, 张家博¹, 具德浩¹, 黄震¹, 韩东²(

)

¹. 上海交通大学动力机械与工程教育部重点实验室
². 重庆大学低品位能源利用技术与系统教育部重点实验室

Exergy losses in premixed flames of dimethyl ether and hydrogen blends

Tongbin ZHAO¹, Jiabo ZHANG¹, Dehao JU¹, Zhen HUANG¹, Dong HAN²(

)

¹. Key Laboratory for Power Machinery and Engineering of the Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
². Key Laboratory for Power Machinery and Engineering of the Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China; Key Laboratory of Low-grade Energy Utilization Technologies and Systems of the Ministry of Education, Chongqing University, Chong-qing 400044, China

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摘要:

本文针对大气压条件下，化学计量比的二甲醚/氢气/空气预混合火焰开展了热力学第二定律分析。火焰过程的可用能损失主要来自于不同的不可逆源，如化学反应、热传导、物质扩散等，以及来自于部分燃烧产物的可用能损失。研究结果表明，无论二甲醚和氢气的混合比例如何，化学反应始终是可用能损失的主要贡献因素，其次是未完全燃烧产物和热传导，而物质扩散对可用能损失的贡献最小。随着氢气比例的提高，源自化学反应、热传导和物质扩散的可用能损失降低，这主要是由于火焰厚度的减小所致。其中，来自化学反应和热传导的可用能损失下降得更为明显，而物质扩散所导致的可用能损失下降较小。然而，来自未完全燃烧的可用能损失随着氢气比例的升高而增加，这是由于氢气和OH基团等未燃燃料和燃烧中间产物的比例上升造成的。随着氢气混合比例从0%升高至100%，二甲醚/氢气预混火焰的总可用能损失下降约5%。

Abstract：

A second-law thermodynamic analysis was conducted for stoichiometric premixed dimethyl ether (DME)/hydrogen (H₂)/air flames at atmospheric pressure. The exergy losses from the irreversibility sources, i.e., chemical reaction, heat conduction and species diffusion, and those from partial combustion products were analyzed in the flames with changed fuel blends. It is observed that, regardless of the fuel blends, chemical reaction contributes most to the exergy losses, followed by incomplete combustion, and heat conduction, while mass diffusion has the least contribution to exergy loss. The results also indicate that increased H₂ substitution decreases the exergy losses from reactions, conduction, and diffusion, primarily because of the flame thickness reduction at elevated H₂ substitution. The decreases in exergy losses by chemical reactions and heat conduction are higher, but the exergy loss reduction by diffusion is slight. However, the exergy losses from incomplete combustion increase with H₂ substitution, because the fractions of the unburned fuels and combustion intermediates, e.g., H₂ and OH radical, increase. The overall exergy losses in the DME/H₂ flames decrease by about 5% with increased H₂ substitution from 0% to 100%.

Key words： second law analysis flame dimethyl ether (DME) hydrogen binary fuels

收稿日期: 2019-04-14 出版日期: 2019-12-26

通讯作者: 黄震,韩东 E-mail: dong_han@sjtu.edu.cn

Corresponding Author(s): Zhen HUANG,Dong HAN

引用本文:

赵同宾, 张家博, 具德浩, 黄震, 韩东. 二甲醚和氢气混合燃料预混火焰中的可用能损失[J]. Frontiers in Energy, 2019, 13(4): 658-666.
Tongbin ZHAO, Jiabo ZHANG, Dehao JU, Zhen HUANG, Dong HAN. Exergy losses in premixed flames of dimethyl ether and hydrogen blends. Front. Energy, 2019, 13(4): 658-666.

链接本文:

https://academic.hep.com.cn/fie/CN/10.1007/s11708-019-0645-8
https://academic.hep.com.cn/fie/CN/Y2019/V13/I4/658

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Fig.2

Fig.3

Fig.4

Tab.1

Fig.5

Fig.6

Fig.7

Tab.2

X	Mole fraction
Y	Mass fraction
$M ˙$ /(kg·s^–1)	Mass flow rate
r/(kg·m^–3)	Mass density
u/(m·s^–1)	Velocity
A/m²	Area
$μ k$ /(J·mol^–1)	Chemical potential of the kth species
$ω ˙$ /(mol·(m³·s)^–1))	Production rate
W/(kg·mol^–1)	Molecular weight
s/(J·(mol·K)^–1)	Specific entropy
c_p/(J·(mol·K)^–1)	Specific constant-pressure heat
T/K	Temperature
l/(W·(m·K)^–1)	Thermal conductivity
$D k − mi x ?$ /(m²·s^–1)	Mass diffusivity of species k in the mixture
$μ / (Pa ? s)$	Viscosity coefficient
S/(J·K^–1)	Entropy
R/(J·(mol·K)^–1)	Universal gas constant
P/atm	Pressure
h/(J·mol^–1)	Specific enthalpy
G/(J·mol^–1)	Gibbs free energy
$S gen \| dissipation$ /(W·(m³·K)^–1)	Volumetric entropy generation rate due to viscous dissipation
$S gen \| conduction$ /(W·(m³·K)^–1)	Volumetric entropy generation rate due to heat conduction
$S gen \| diffusion$ /(W·(m³·K)^–1)	Volumetric entropy generation rate due to mass diffusion
$S gen \| reaction$ /(W·(m³·K)^–1)	Volumetric entropy generation rate due to chemical reaction
$B destruction$ /(W·m^–2)	Exergy loss due to entropy generation
$B incomplete$ /(W·m^–2)	Exergy loss due to incomplete combustion
$B fuel$ /(W·m^–2)	Initial chemical exergy carried by the fuel
0	Dead state
complete, pro	Complete combustion products
incomplete, pro	Incomplete combustion products

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