O2/CO2气氛下CO2对乙炔可燃下限的影响

李家瑶; 梁容真; 胡贤忠

doi:10.11883/bzycj-2024-0359

O₂/CO₂气氛下CO₂对乙炔可燃下限的影响

doi: 10.11883/bzycj-2024-0359

李家瑶^1,,
梁容真^{1, 2},
胡贤忠^1, ,

1.
东北大学冶金学院，辽宁沈阳 110819
2.
雷沃重工集团有限公司，山东青岛 266500

基金项目: 辽宁省自然科学基金项目（2023-1SBA-100）；中央高校基本科研业务费（N2425018）

详细信息

作者简介:
李家瑶（1999－　），男，硕士研究生，2201654@stu.neu.edu.cn

通讯作者:
胡贤忠（1984－　），男，博士，副教授，huxz@smm.neu.edu.cn

中图分类号: O389; TK16
计量
- 文章访问数: 25
- HTML全文浏览量: 4
- PDF下载量: 8
- 被引次数: 0
出版历程
- 收稿日期: 2024-09-23
- 修回日期: 2024-12-31
- 网络出版日期: 2025-01-01

Study of the effect of CO₂ on the lower flammability limit of acetylene in O₂/CO₂ atmosphere

LI Jiayao^1
,,
LIANG Rongzhen^{1, 2},
HU Xianzhong^{1
, ,}

1.
School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
2.
Lovol Heavy Industry Group Co. , Ltd., Qingdao 266500, Shandong, China

摘要

摘要: 为探究清洁燃料乙炔在O₂/CO₂气氛下的可燃下限，在5 L圆柱体爆炸反应装置中进行实验，测得了乙炔的可燃下限。随着CO₂的体积分数从14%增加到85%，乙炔的可燃下限从2.64%增长到3.93%，在较小的范围内呈线性增加。烷烃、烯烃和炔烃的可燃下限依次降低，表明炔烃具有更大燃烧范围。基于极限层流速度法计算模型，建立了适用于乙炔可燃下限的预测模型。通过实验数据，验证了该模型的可靠性，采用该模型讨论了CO₂的热力学、化学、输运效应对可燃下限的影响。结果表明：热力学效应的平均占比约为64%，化学效应占比35%，输运效应占比1%。
- 乙炔 /
- O_2/CO₂ /
- 可燃下限 /
- 极限层流速度法
Abstract: Oxy-fuel combustion is one of the effective means to reduce greenhouse gases. In order to grasp the combustion characteristics of the clean fuel acetylene in O₂/CO₂ atmosphere and to investigate the effect of different concentrations of CO₂ on the lower flammable limit of acetylene, the lower flammable limit of acetylene was experimentally measured in a 5L cylindrical explosive reaction device. With the increase of CO₂ concentration from 14% to 85%, the experimental value of the lower flammable limit of acetylene increased from 2.64% to 3.93%, which was linearly increased in a small range. Compared with hydrocarbon fuels such as ethylene, ethane, and propylene, the lower flammability limit presents alkanes > olefins > alkynes, indicating that alkynes have a larger combustion range and a higher hazard factor. Based on the calculation model of limiting laminar flame velocity method, a prediction model applicable to the lower flammability limit of acetylene was established. Through the verification of experimental data, the average absolute error of this prediction model using the USC II combustion reaction mechanism is at 0.52%, and the model is accurate and reliable. In order to explain the reason for the existence of the lower flammability limit from the perspective of the competition between the temperature rise of the heat generation from fuel consumption and the temperature drop of the heat dissipation from the expansion of the fuel body, the thermodynamic, chemical, and transport effects of CO₂ on the lower flammability limit are discussed by using the model and modifying the combustion reaction mechanism of USC II to introduce the virtual substances FCO₂, TCO₂, and MCO₂, and comparing the flammability limits of the three virtual substances as well as those of the five atmospheres of N₂ and CO₂. The thermodynamic, chemical and transport effects of CO₂ on the lower flammability limit were discussed. The results show that the average proportion of thermodynamic effect is 64%, chemical effect is 35% and transportation effect is 1%.
- acetylene /
- O₂/CO₂ /
- lower flammability limit /
- limiting laminar velocity method

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图 1 实验装置示意图

Figure 1. Schematic diagram of the experimental setup

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图 2 极限层流燃烧速度法原理图

Figure 2. Schematic diagram of the limiting laminar burning velocity method

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图 3 可燃下限的实验值

Figure 3. Experimental values of lower flammability limit

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图 4 可燃下限的实验值（点）及预测值（线）

Figure 4. Experimental (point) and predicted (line) values of lower flammability limits

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图 5 浮力燃烧力变化曲线

Figure 5. Change curve of buoyancy combustion force

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图 6 不同稀释气氛下的可燃下限

Figure 6. Lower flammability limits in different dilution atmospheres

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图 7 不同CO₂浓度时3种效应对可燃下限的影响

Figure 7. Influence of three effects on the lower flammability limit at different CO₂ concentrations

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图 8 定压比热容随温度、稀释气占比变化的曲面

Figure 8. Constant-pressure specific heat capacity with temperature, dilution gas percentage change surface

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图 9 不同CO₂浓度及不同气氛可燃下限处的敏感性分析

Figure 9. Sensitivity analysis at different CO₂ concentrations and lower flammability limits of different atmospheres

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图 10 三体效应对可燃下限的影响

Figure 10. Three-body effect on lower flammability limits

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图 11 不同气氛下主要自由基OH、O、H摩尔分数变化曲线

Figure 11. Variation curves of OH, O and H molar fractions of major radicals under different atmospheres

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表 1 乙炔常用燃烧反应机理

Table 1. Common Combustion Reaction Mechanisms for Acetylene

序号	机理名称	年份	反应/物种数量
1	USC Mech II	2007	784/112
2	GRI-Mech 3.0	1999	325/53
3	Davis	2017	469/71
4	San Diego	2014	247/50
5	Wang	1999	529/75

下载: 导出CSV

表 2 自由基峰值摩尔分数比例

Table 2. Ratio of peak molar fractions of free radicals

稀释气浓度/%	自由基峰值摩尔分数比
稀释气浓度/%	H_CO₂∶H_FCO₂	O_CO₂∶O_FCO₂	OH_CO₂∶OH_FCO₂	H_CO₂∶H_MCO₂	O_CO₂∶O_MCO₂	OH_CO₂∶OH_MCO₂
14	0.928	1.001	1.03	0.881	0.983	1.042
52	0.769	0.959	1.07	0.681	0.881	1.12
85	0.79	0.805	1.038	0.76	0.702	1.251

下载: 导出CSV

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