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    李岁, 王元华. 油田水套加热炉高温空气燃烧瞬态模拟及最小换向时间[J]. 华东理工大学学报(自然科学版), 2019, 45(5): 823-830. DOI: 10.14135/j.cnki.1006-3080.20180723008
    引用本文: 李岁, 王元华. 油田水套加热炉高温空气燃烧瞬态模拟及最小换向时间[J]. 华东理工大学学报(自然科学版), 2019, 45(5): 823-830. DOI: 10.14135/j.cnki.1006-3080.20180723008
    LI Sui, WANG Yuanhua. Transient Simulation and the Minimum Reversal Time of High Temperature Air Combustion in Oil-Field Jacket Heater[J]. Journal of East China University of Science and Technology, 2019, 45(5): 823-830. DOI: 10.14135/j.cnki.1006-3080.20180723008
    Citation: LI Sui, WANG Yuanhua. Transient Simulation and the Minimum Reversal Time of High Temperature Air Combustion in Oil-Field Jacket Heater[J]. Journal of East China University of Science and Technology, 2019, 45(5): 823-830. DOI: 10.14135/j.cnki.1006-3080.20180723008

    油田水套加热炉高温空气燃烧瞬态模拟及最小换向时间

    Transient Simulation and the Minimum Reversal Time of High Temperature Air Combustion in Oil-Field Jacket Heater

    • 摘要: 为解析蓄热式高温空气燃烧过程,采用Fluent软件对油田水套加热炉高温燃烧系统进行换向瞬态模拟,分析了氧气体积分数、空气预热温度、负荷对燃烧特性及最小换向时间选取的影响。结果表明:换向后炉内燃烧可分为4个过程:乏汽排空、火焰再燃、火焰扩散、稳定燃烧;NO质量分数与温度有相同变化规律,但稍有滞后;降低氧气体积分数、提高助燃空气预热温度能减少最小换向时间,负荷变化对最小换向时间无明显影响;建议将15 s作为油田水套加热炉高温空气燃烧工业应用中最小换向时间的参考值。

       

      Abstract: The reversal time of the high temperature air combustion is usually determined by engineering experience and the thermal characteristics of the regenerator, which often ignores the combustion in furnace. If the reversal time is too short, it will cause incomplete combustion, large fluctuation of furnace temperature and other problems. Therefore, it is necessary to analyze the minimum reversal time from the perspective of combustion in furnace. The commercial software Fluent was used to perform the transient simulation for analyzing the combustion process of high temperature air combustion system in oil-field jacket heater. Influences of the volume fraction of oxygen, load fluctuation and temperature of the heated air on combustion performance and reversal time were analyzed. The results show that the combustion in furnace can be divided into four processes: exhaust gases evacuation, flame reburning, flame diffusion and stable combustion. At the stage of exhaust gases evacuation, the high temperature gas is discharged out, which makes a rapid drop of temperature during the original combustion. At the same time, fresh gas gets in, so the temperature decreases at the original fume side. After about 0.2 s, the flame reburns at the original fume side, and the temperature in the furnace rises rapidly. Then the flame diffuses forward, and the temperature is increased and then is prone to be stable in the whole furnace. The mass fraction of NO shows a similar evolution as that of temperature change, and has a certain lag. The minimum reversal time should be no less than the stabilization time of temperature and the mass fraction of NO in the furnace. Reducing the volume fraction of oxygen and increasing the temperature of preheated air can stabilize the combustion and reduce the minimum reversal time. Load fluctuation has no obvious effect on the minimum reversal time. 15 s is the commendatory minimum reversal time of this kind of jacket heater.

       

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