Homogeneous/heterogeneous coupled combustion of heptane in a partially packed bed burner

doi:10.16085/j.issn.1000-6613.2022-1926

Abstract

Abstract:

Premixed combustion experiments of n-heptane were carried out in a micro-burner, and three different combustion modes were studied: homogeneous combustion (HMC), heterogeneous combustion (HTC), and coupled combustion (CC) in which homogeneous combustion and heterogeneous combustion simultaneously occurred. The combustion characteristics were analyzed under the three combustion modes, including the stable combustion range, conversion rate, combustion efficiency, gas product distribution characteristics, wall maximum temperature and wall temperature characteristics of n-heptane with different input power (P=20—70W) and equivalent ratio (Φ=0.55—2.5). The results showed that the stable combustion range of CC mode is the smallest and was limited by both HMC lean combustion limit and HTC rich combustion limit. The conversion rate of n-heptane was higher in the HMC and CC combustion modes, and the conversion rate exceeded 90% when Φ≤1.6. The conversion rate of n-heptane was only 16%—31% under HTC condition, and the product had high CO₂ selectivity, while other combustible gases were almost absent. When Φ≥1.0, the combustion efficiency of CC was higher than that of HMC. The reason was that the content of incomplete combustion products such as H₂, CO, C₂H₄, and C₂H₂ was smaller in CC mode, and the content of CO₂ in complete combustion products was higher. The maximum wall temperature of the three combustion modes showed a trend of T_max-HMC＞T_max-CC＞T_max-HTC. CC combustion mode had no obvious hot spot, had longer reaction high temperature zone and more uniform wall temperature distribution, and had high combustion efficiency, which was of great significance for the practical application of thermoelectric system and thermal photovoltaic system.

Key words: homogeneous combustion, heterogeneous combustion, coupled combustion, n-heptane, catalysis

摘要：

在微小型燃烧器内进行了正庚烷的预混燃烧实验，研究三种不同的燃烧模式，即均相燃烧（HMC）、异相燃烧（HTC）、均相燃烧与异相燃烧同时发生的耦合燃烧（CC），包括三种燃烧模式下不同输入功率（P=20~70W）和当量比（Φ=0.55~2.5）的正庚烷的稳燃范围、转化率、燃烧效率、气相产物分布特性、壁面最高温度以及壁面沿程温度的特性。结果表明：CC模式的稳燃范围最小且同时受到HMC贫燃极限和HTC富燃极限的限制。HMC和CC燃烧模式下正庚烷转化率较高，在Φ≤1.6时，转化率超过90%。HTC工况下正庚烷转化率仅为16%~31%，产物CO₂选择性高，其他可燃气体基本没有。当Φ≥1.0时，CC的燃烧效率大于HMC，其原因在于CC模式下不完全燃烧产物（如H₂、CO、C₂H₄、C₂H₂等）含量较小，完全燃烧产物CO₂含量高。三种燃烧模式的最高壁面温度呈现出T_max-HMC＞T_max-CC＞T_max-HTC的趋势。CC燃烧模式无明显热点，具有更长的反应高温区和更均匀的壁温分布，燃烧效率高，对热电系统、热光伏系统的实际应用有较大意义。

关键词: 均相燃烧, 异相燃烧, 耦合燃烧, 正庚烷, 催化

CLC Number:

TK16

GENG Yuanze, ZHOU Junhu, ZHANG Tianyou, ZHU Xiaoyu, YANG Weijuan. Homogeneous/heterogeneous coupled combustion of heptane in a partially packed bed burner[J]. Chemical Industry and Engineering Progress, 2023, 42(9): 4514-4521.

耿源泽, 周俊虎, 张天佑, 朱晓宇, 杨卫娟. 部分填充床燃烧器中庚烷均相/异相耦合燃烧[J]. 化工进展, 2023, 42(9): 4514-4521.

Figures/Tables 13

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