Experiment and Numerical Simulation Study of Low-nitrogen Combustion Technology inside Small Gas Boiler

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS Journal of Energy Resources Technology-transactions of The Asme Pub Date : 2023-06-30 DOI:10.1115/1.4062871
K. Sun, Tingyu Ao, Xiangyun Liu, Liang Liu, Zhu Liang
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Abstract

This paper studies different experimental conditions for a 25t/h industrial boiler fueled with nature gas. In the meanwhile, numerical simulation is carried out using the commercial software of Fluent. The different excess air coefficient of 1.05,1.1,1.15,1.2 and 1.25 are studied. The different flue gas circulation rate of 5%,10%,15% and 20% are studied compared with that rate of 0. The results show that the maximum temperature of the furnace and NOx emission concentration at the outlet increase firstly and then decrease with increasing of excess air coefficient when flue gas circulation rate is 0, and the peak value of temperature and NOx emission concentration reaches to 2071.93K and 65.21mg/m3 when excess air coefficient is 1.15, respectively. With increasing of flue gas circulation rate, the average temperature of the furnace and the concentration of NOx at the outlet decrease, the concentration of NOx decrease from 65.21mg/m3 to 25mg/m3. The higher of the flue gas circulation, the smaller of the high temperature area of the furnace and the lower concentration of O2. However, excessively higher flue gas circulation rate and excess air coefficient can lead to incomplete combustion and lower coefficient. Hence, for optimizing the combustion conditions, the excess air coefficient and the flue gas circulation rate should be within an appropriate range.
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小型燃气锅炉低氮燃烧技术的试验与数值模拟研究
本文研究了以天然气为燃料的25t/h工业锅炉的不同试验条件。同时,利用Fluent商业软件进行了数值模拟。对1.05、1.1、1.5、1.2和1.25的不同过量空气系数进行了研究。对5%、10%、15%和20%的不同烟气循环率与0的循环率进行了比较。结果表明,当烟气循环率为0时,炉膛最高温度和出口NOx排放浓度随过量空气系数的增加先升高后降低,当过量空气系数为1.15时,炉膛温度和NOx排放浓度峰值分别达到2071.93K和65.21mg/m3。随着烟气循环速率的增加,炉膛平均温度和出口NOx浓度降低,NOx浓度从65.21mg/m3降至25mg/m3。烟气循环越高,炉膛的高温区域越小,O2浓度越低。然而,过高的烟气循环率和过量空气系数会导致不完全燃烧和系数降低。因此,为了优化燃烧条件,过量空气系数和烟气循环速率应在适当的范围内。
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来源期刊
CiteScore
6.40
自引率
30.00%
发文量
213
审稿时长
4.5 months
期刊介绍: Specific areas of importance including, but not limited to: Fundamentals of thermodynamics such as energy, entropy and exergy, laws of thermodynamics; Thermoeconomics; Alternative and renewable energy sources; Internal combustion engines; (Geo) thermal energy storage and conversion systems; Fundamental combustion of fuels; Energy resource recovery from biomass and solid wastes; Carbon capture; Land and offshore wells drilling; Production and reservoir engineering;, Economics of energy resource exploitation
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