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引用次数: 0
摘要
飞灰作为燃煤电厂的固体废物，在运输过程中会对大气环境造成污染。本研究的目的是提高电凝聚法对粉煤灰细颗粒的除尘效率，并获得合理的操作参数。通过建立离散元软球计算模型，研究了颗粒浓度、气体速度、交流频率和电压对颗粒电凝效率的影响，得到了合理的电凝操作参数。通过对粉煤灰电凝除尘实验，根据颗粒数浓度、电凝效率和颗粒微观特征对除尘过程进行了评价。结果表明，提高颗粒浓度，降低气体流速，选择合理的交流频率和电压，可以有效地提高实时电凝的效率和稳定性。在电压3 kV、气流速度5 m s–1、颗粒浓度30 mg m–3和交流频率100 Hz的适宜条件下，电凝效率高于40%。在空气相对湿度低于70%、环境温度高于20°C的情况下，电凝聚能有效提高粉煤灰细颗粒的除尘效率。
Feasibility of improving dust removal efficiency of fly ash fine particles for coal-fired power plants
As solid waste of coal-fired power plants, atmospheric environmental pollution is caused by fly ash during transportation. The purpose of this study was to improve the dust removal efficiency of fly ash fine particles by electrocoagulation and obtain reasonable operating parameters. The effects of particle concentration, gas velocity, AC frequency, and voltage on particle electrocoagulation efficiency were studied through the establishment of a discrete element soft sphere calculation model, and reasonable electrocoagulation operation parameters were obtained. The dust removal process was evaluated according to the particle number concentration, electrocoagulation efficiency, and particles microscopic characteristics due to the dust removal experiments of fly ash by electrocoagulation. The results demonstrated that increasing particle concentration, reducing gas velocity, and selecting reasonable AC frequency and voltage were effective to improve the real-time electrocoagulation efficiency and its stability. Under the suitable conditions: voltage of 3 kV, airflow velocity of 5 m s–1, particle concentration of 30 mg m–3 and AC frequency of 100 Hz, the electrocoagulation efficiency was higher than 40%. The electrocoagulation was effective to improve the dust removal efficiency of fly ash fine particles with a relative humidity of air below 70% and ambient temperatures above 20°C.
期刊介绍：
CLEAN covers all aspects of Sustainability and Environmental Safety. The journal focuses on organ/human--environment interactions giving interdisciplinary insights on a broad range of topics including air pollution, waste management, the water cycle, and environmental conservation. With a 2019 Journal Impact Factor of 1.603 (Journal Citation Reports (Clarivate Analytics, 2020), the journal publishes an attractive mixture of peer-reviewed scientific reviews, research papers, and short communications.
Papers dealing with environmental sustainability issues from such fields as agriculture, biological sciences, energy, food sciences, geography, geology, meteorology, nutrition, soil and water sciences, etc., are welcome.
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