Тип публикации: статья из журнала
Год издания: 2021
Идентификатор DOI: 10.1016/j.fuproc.2021.106986
Ключевые слова: boiler start-up, charcoal, coal, combustion of solid fuels, ignition delay time, woody biomass
Аннотация: The research is focused on the ignition of solid fuels in a heated air flow. The experimental conditions correspond closely to solid fuel combustion in coal-fired boiler furnaces. Charcoal, wood, brown and bituminous coals were used as independent solid fuels and as fuel mixture components. The particle sizes of these fuels were leПоказать полностьюss than 40 μm, 40–140 μm, 140–250 μm, 250–375 μm and 375–800 μm. They were ignited under the conditions of radiant-convective heating as they were moving in a heated air flow with a temperature of 500–800 °C and at a velocity of 5 m/s. The ignition delay time was the main investigated characteristic, recorded by a high-speed video camera. The induction period of bituminous coal shortens by 25–35% when 25–50% brown coal or wood in an air-dry state is added. The lowest ignition delay times were established for the fuel mixtures of bituminous coal with dry charcoal. The experimental curves of the ignition delay times of fuels and their mixtures versus the heated air temperature were presented as approximation equations. Based on the conducted research findings, a muffle burner design with a vortex structure of the fuel-air flow was proposed for the fuel oil-free start-up of coal-fired boilers. © 2021 Elsevier B.V.
Журнал: Fuel Processing Technology
Выпуск журнала: Vol. 223
Номера страниц: 106986
ISSN журнала: 03783820
Издатель: Elsevier B.V.