Effect of Fly Ash from Coal-fired Boiler on Heat Transfer Efficiency

摘要

Energy conservation and emission reduction are the development goals of future industry, and heat exchangers play a vital role in the efficient use of energy. But the fly ash formed by the insufficiently burnt coal powder and other impurities has many negative effects in the waste heat recovery. Tube bundle wear and ash deposition in heating surface are common problems in engineering. To explore the effect of fly ash on heat transfer, a small heat transfer testor was established in laboratory, and the characteristics of fly ash, such as particle concentration, velocity, and particle size were studied in this testor. Based on experimental work, it is helpful to improve the service life of equipment. The summed empirical formula has certain guiding significance for actual engineering production.