惰性气体对C<sub>3</sub>H<sub>8</sub>可燃下极限的影响

陆毅; 胡贤忠; 张国栋

doi:10.11883/bzycj-2021-0231

惰性气体对C₃H₈可燃下极限的影响

doi: 10.11883/bzycj-2021-0231

东北大学冶金学院，辽宁沈阳 110819

基金项目: 国家自然科学基金（51706037）

详细信息

作者简介:
陆　毅（1996－　），男，硕士研究生， luyieric@163.com

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
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- 被引次数: 0
出版历程
- 收稿日期: 2021-06-07
- 修回日期: 2021-07-13
- 网络出版日期: 2022-01-13
- 刊出日期: 2022-02-28

The influence of inert gas on the lower flammability limit of propane

School of Metallurgy, Northeastern University, Shengyang 110819, Liaoning, China

摘要

摘要: 为探究CO₂、N₂和Ar对C₃H₈可燃下极限的影响，在5 L爆炸容器中测定了C₃H₈在O₂/CO₂、O₂/Ar、O₂/N₂三种气氛下的可燃下极限。首先分析了稀释气浓度、稀释气种类和氧气浓度对C₃H₈的可燃下极限的影响。结果表明，在O₂/CO₂气氛下，稀释气浓度变化对C₃H₈的可燃下极限影响最大，对O₂/Ar的影响次之，对O₂/N₂的影响最小。在相同稀释气浓度条件下，CO₂对C₃H₈可燃下极限的影响最大，N₂的影响次之，Ar的影响最小。随着O₂浓度的上升，O₂/CO₂气氛的可燃下极限出现较为明显的下降，O₂/N₂和O₂/Ar的氛围的可燃下极限平缓上升。通过建立能量平衡方程分析了稀释气的比热和辐射效应对可燃下极限的影响。结果表明，混合气比热的改变是C₃H₈可燃下极限改变的主要原因，辐射热损失是影响可燃下极限的重要因素。
- O₂/CO₂气氛 /
- 可燃下极限 /
- C₃H₈ /
- 辐射热损失
Abstract: Propane is a main component of liquefied petroleum gas, and the lower flammability limit is an important indicator for evaluating the safety of combustible gases. The addition of diluent gas can affect the lower flammability limit and reduce the flammable range of propane, so as to achieve the purpose of explosion suppression. CO₂, N₂ and Ar are commonly used as diluents in the industry. In order to explore their influence on the lower flammability limit of C₃H₈, the lower flammability limits of C₃H₈ under O₂/CO₂, O₂/Ar and O₂/N₂ atmosphere were measured in a 5 L explosive container based on the American ASTM E681-09 standard. The gas mixture was configured according to the partial pressure of each gas, and a pair of high-voltage electrodes was used for ignition. The influences of dilution gas concentration, dilution gas type and O₂ concentration on the lower flammability limit of C₃H₈ was analyzed. The results show that CO₂ has the greatest impact on the lower flammability limit of C₃H₈, followed by N₂ and Ar. With the increase of O₂ concentration, the lower flammability limit under O₂/CO₂ atmosphere decreases significantly, and the lower flammability limit under O₂/N₂ and O₂/Ar atmosphere shows a gentle increase. An energy balance equation was established to calculate the radiative heat loss (Q_r) and endothermic loss (Q_t) of the mixed gas at the lower flammability limit. The effects of specific heat and radiation on the lower flammable limit were compared. The results show that the change in the specific heat of the mixture is the main reason for the change of the lower flammability limit of C₃H₈, and the radiant heat loss is an important factor in the change of the lower flammability limit. As the concentration of diluent increases, CO₂ has the largest impact on λ（Q_t） and λ（Q_r） followed by Ar and N₂. The adiabatic flame temperature is an important factor that affects the change of the lower flammability limit.
- O₂/CO₂ atmosphere /
- lower flammability limit /
- C₃H₈ /
- radiant heat loss

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图 1 实验装置

Figure 1. Experimental device

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图 2 火焰扩散过程

Figure 2. Flame diffusion process

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图 3 O₂/稀释气气氛下稀释气体积分数对C₃H₈的LFL的影响

Figure 3. Influence of diluent volume fraction on LFL of C₃H₈ in the O₂/diluent atmosphere

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图 4 O₂/CO₂气氛下O₂体积分数对C₃H₈的LFL的影响

Figure 4. Influence of O₂ volume fraction on LFL of C₃H₈ in the O₂/CO₂ atmosphere

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图 5 循环迭代过程流程图

Figure 5. Flow chart of the loop iteration process

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图 6 稀释气/O₂气氛下LFL处λ（Q_t）、λ（Q_r）的变化

Figure 6. Variations of λ(Q_t) and λ(Q_r) at the LFL in the diluent/O₂ atmosphere

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图 7 稀释气/O₂气氛下LFL处火焰温度T的变化

Figure 7. Variation of the flame temperature T at the LFL in the diluent/O₂ atmosphere

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