Study on Combustion Characteristics of Porous Media of Gaseous Fuels with Low Calorific Value
1. School of Energy and Power, Dalian University of Technology, Dalian 116024, China
2. College of Material and Metallurgy, Wuhan Science and Technology University, Wuhan 430081, China
| Abstract: | The utilization of low calorific value gaseous fuels can not only avoid environmental pollution caused by emissions into the atmosphere, but also save energy and truly achieve energy conservation and environmental protection. However, it is difficult to achieve stable combustion of gaseous fuels with low calorific value with existing traditional combustion technologies. Due to the porous media combustion technology has the advantages of high combustion efficiency, wide flammability limit, large combustion regulation ratio, and low pollutant emission, the porous medium combustion technology is selected to treat and utilize low calorific value gaseous fuels. Using the porous medium test bench, the dry quenching coke oven tail gas was selected as a low calorific value gas fuel for experimental research. The dry quenching coke oven tail gas is composed of 79% N2, 10% CO2, 7% CO, 3% H2 and 1% O2, with a calorific value of about 1.2 MJ/Nm3. The effects of methane blending ratio, combustion equivalent ratio, combustion intensity and other factors on key characteristics such as flame movement and CO emission concentration were investigated. Research has found that when the combustion intensity and methane blending ratio are the same, as the equivalence ratio increases, the thickness of the flame zone shows a trend of first increasing and then decreasing, and the starting time first decreases. When the combustion equivalent ratio is 1.0, the starting time increases and then continues to decrease; When the methane blending ratio is 0, combustion cannot be maintained; The influence of methane blending ratio on the thickness of the flame core area is relatively low. As the methane blending ratio decreases, the start-up time significantly increases, and preheating will significantly reduce the start-up time; The CO emission concentration is sensitive to the change of the equivalent ratio, and the CO emission concentration is similar when the equivalent ratio is equal to 0.7 and 0.8 in each working condition, and the CO emission is the lowest among all equivalent ratios, and begins to increase sharply when it reaches 0.9. In this experiment, the NOx emission concentration was consistently below 10 ppm. |
| Keywords: | Low Calorific Value Gaseous Fuels; Combustion of Porous Media; Flue Gas Emission Characteristics; Flame Thickness; Combustion Start-up Characteristics |
| DOI: | 10.57237/j.jest.2025.01.001 |
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Received: 17 February 2025
Accepted: 3 April 2025
Published Online: 30 May 2025
Funding
| 1. | 工业炉窑节能低氮多孔介质燃烧技术开发与应用, 辽宁省中央引导地方科技发展重点项目 (自由探索类基础研究), (基金号: 2023JH6/100100020) |
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