一种旋风燃烧器内煤颗粒燃烧及沉积特性的研究

采用数值模拟与试验相结合的方法研究了某旋风燃烧器内煤颗粒的燃烧及沉积特性．结果表明：该燃烧器在不同负荷下均能实现高温燃烧（1700K以上），并获得较高的燃烧效率及捕渣率．煤颗粒主要在燃烧器前部沉积，且上下壁面的分布几乎一致；较小的煤颗粒跟随性好，不易沉积，60μm以上的煤颗粒几乎能在燃烧器中前部全部沉积下来并附壁燃烧；较小的过量空气系数及适中的一次风率（O．3～0．35左右）能保证煤颗粒在燃烧器内壁面上沉积分布较均匀，不至于造成低温区域燃烧通道煤粉堵塞．

Study on Combustion and Deposition Characteristics of Coal Particles in a Cyclone Burner

Combustion and deposition characteristics of coal particles in a cyclone burner were studied by numerical simulation and experiments. Results show that the burner can realize high-temperature combus- tion （above 1 700 K） at different loads, with high combustion efficiency and slag captured rate. Particles mainly deposit on the front wall, evenly distributed on both the upper and lower part. Smaller particles can follow well with the airflow, and are hard to deposit. Almost all the particles larger than 60/μm can depos- it and burn on the front wall. To get uniform distribution of coal particles on inner wall of the burner, and prevent them from jamming in the low-temperature region, it is recommended to apply an appropriate ex- cess air coefficient and a primary air ratio within 0.30-0.35.