Jun Liu , Zheng Xie , Bingyu Guo , Yingzhe Xu , Qiuhong Wang , Xinwei Guo , Li Bai , Jisheng Long
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The results show that the moisture evaporation and mass loss rates of combusted MSW (municipal solid waste) increase accordingly as the air ratios of the primary air in the zone1 increases. As the ratio of air flow in the combustion section (zone 2) in the grate chamber increases, the high temperature area and oxygen concentration above the grate will increase, and the NO formation will be promoted accordingly. The NO concentration at the furnace outlet is reduced from 259.34 mg/Nm<sup>3</sup> to 201.34 mg/Nm<sup>3</sup>, as the air flow ratio of the grate chamber in the combustion section (zone 2) is reduced from 0.50 to 0.34. With the increase of secondary airflow ratio, the high temperature zone in the furnace increases, and more NO is generated above the grate, however, the NO concentration at the furnace outlet decreased, the probable reason is the combined result of temperature and turbulent kinetic energy. The secondary air speed has a great influence on NO generation. With the increase of secondary air speed of SA3 and SA4, the concentration of NO at the furnace outlet decreases. 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In order to reveal the influence of air distribution on the combustion process and NO emission in a grate-type waste incinerator, the combustion process and NOx generation in a waste incinerator were studied, and the influence of different ratios of primary air in the grate chamber, different ratios of primary air and secondary air, and different speeds and angles of secondary air on the combustion and NOx emission characteristics were explored. The results show that the moisture evaporation and mass loss rates of combusted MSW (municipal solid waste) increase accordingly as the air ratios of the primary air in the zone1 increases. As the ratio of air flow in the combustion section (zone 2) in the grate chamber increases, the high temperature area and oxygen concentration above the grate will increase, and the NO formation will be promoted accordingly. 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引用次数: 0
摘要
垃圾焚烧发电的燃烧过程优化和氮氧化物减排是一项关键挑战。为了揭示空气分布对炉排式垃圾焚烧炉燃烧过程和氮氧化物排放的影响,研究了垃圾焚烧炉的燃烧过程和氮氧化物产生情况,探讨了炉排炉膛内一次风不同配比、一次风与二次风不同配比、二次风不同速度和角度对燃烧和氮氧化物排放特性的影响。结果表明,随着1区一次风比例的增加,燃烧后的MSW(城市固体废物)水分蒸发率和质量损失率也相应增加。随着炉排室燃烧段(2 区)空气流量比的增加,炉排上方的高温区和氧气浓度也会增加,相应地也会促进 NO 的形成。当燃烧段(2 区)炉排室的空气流速比从 0.50 降低到 0.34 时,炉膛出口处的 NO 浓度从 259.34 mg/Nm3 降低到 201.34 mg/Nm3。随着二次风流比的增大,炉内高温区增大,炉排上方产生更多的 NO,但炉出口处的 NO 浓度却降低了,这可能是温度和湍流动能共同作用的结果。二次风速对 NO 的生成有很大影响。随着 SA3 和 SA4 二次风速的增加,炉口的 NO 浓度降低。二次风角度对 NO 生成的影响不大,但对温度分布的均匀性有很大影响。
The effect of air distribution on the characteristics of waste combustion and NO generation in a grate incinerator
The combustion process optimization and nitrogen oxide emissions reduction of waste incineration power generation is a key challenge. In order to reveal the influence of air distribution on the combustion process and NO emission in a grate-type waste incinerator, the combustion process and NOx generation in a waste incinerator were studied, and the influence of different ratios of primary air in the grate chamber, different ratios of primary air and secondary air, and different speeds and angles of secondary air on the combustion and NOx emission characteristics were explored. The results show that the moisture evaporation and mass loss rates of combusted MSW (municipal solid waste) increase accordingly as the air ratios of the primary air in the zone1 increases. As the ratio of air flow in the combustion section (zone 2) in the grate chamber increases, the high temperature area and oxygen concentration above the grate will increase, and the NO formation will be promoted accordingly. The NO concentration at the furnace outlet is reduced from 259.34 mg/Nm3 to 201.34 mg/Nm3, as the air flow ratio of the grate chamber in the combustion section (zone 2) is reduced from 0.50 to 0.34. With the increase of secondary airflow ratio, the high temperature zone in the furnace increases, and more NO is generated above the grate, however, the NO concentration at the furnace outlet decreased, the probable reason is the combined result of temperature and turbulent kinetic energy. The secondary air speed has a great influence on NO generation. With the increase of secondary air speed of SA3 and SA4, the concentration of NO at the furnace outlet decreases. The secondary air angle has little effect on NO generation, but has great effect on temperature distribution uniformity.
期刊介绍:
The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include:
Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies
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Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS;
Petroleum engineering and fuel quality, including storage and transport
Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling
Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems
Energy storage
The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.