燃烧空气加湿对燃气锅炉能源环境性能影响的实验研究

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS
Qunli Zhang, Yanxin Li, Qiuyue Zhang, Yuqin Jiao, Qiu Shi, Xiaoshu Lü
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引用次数: 0

摘要

摘要为提高燃气锅炉余热回收效率,降低NOx排放,提出了一种集直接接触式换热器(DCHE)和燃烧空气加湿(CAH)为一体的烟气全热回收(FGTHR)系统。建立了实验平台和技术经济分析模型,模拟和评估了各种运行工况下的水冷比性能和氮氧化物排放。结果表明:当空气湿度比由3 g/kgdry空气增加到60 g/kgdry空气时,露点温度升高7.9℃;当烟气温度接近露点温度时,FGTHR系统总热效率的提高速度明显加快。当喷淋水流量为0.075 kg/s,温度为45℃时,WHR效率相对提高8.4%。最大感热可回收4468 w,最大潜热可回收3774 w。烟气温度降至46.55℃,NOx平均浓度为39.6 mg/m3。与不加湿相比,FGTHR系统的NOx和CO2排放量相对减少了61.2%和8.7%。FGTHR系统的投资回收期为2年。通过模拟可以得出,废气温度和速度的降低,以及废气湿度的增加,对NOx在大气中的扩散有负面影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental research on effects of combustion air humidification on energy and environment performance of a gas boiler
Abstract To increase the waste heat recovery (WHR) efficiency of gas boiler and decrease NOx emissions, a flue gas total heat recovery (FGTHR) system integrating direct contact heat exchanger (DCHE) and combustion air humidification (CAH) is put forward. The experimental bench and technical and economic analysis models are setup to simulate and evaluate the WHR performance and NOx emissions on various operation situations. The results show that when the air humidity ratio elevates from 3 g/kgdry air to 60 g/kgdry air, the dew point temperature increases by 7.9 °C. When the flue gas temperature approaches the dew point temperature, the rate of improvement of the FGTHR system's total heat efficiency notably rises. With spray water (SW) flow rate and temperature of 0.075 kg/s and 45 °C, the WHR efficiency relatively increases by up to 8.4%. The maximum sensible and latent heat can be recovered by 4468 w and 3774 w, respectively. The flue gas temperature can be reduced to 46.55 °C and the average NOx concentration is 39.6 mg/m3. Compared with the non-humidified condition, the NOx and CO2 emissions relative reduction of the FGTHR system are 61.2% and 8.7%. The payback period of FGTHR system is 2 years. Through simulation, it can be concluded that the decrease in exhaust flue gas temperature and velocity, as well as the increase in exhaust flue gas humidity, have a negative impact on the diffusion of NOx in the atmosphere.
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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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