The circulating fluidized bed CFB combustion technology has attracted the attention of various countries because of its unique advantages in replacing fuel, treating various wastes and protecting the environment. Biomass circulating fluidized bed boilers are one of the best choices for high-parameter, high-load biomass cogeneration and central heating in various countries.
biomass circulating fluidized bed CFB boiler adopts single drum and natural circulation model. Generally, it is divided into two shafts, the front and the tail. The front shaft is the main suspension structure and is surrounded by a membrane water wall. From bottom to top, the sequence is primary air chamber, dense phase zone and dilute phase zone, and from top to bottom, the tail flue is high temperature super-heater, low temperature super-heater, economizer and air pre-heater. The tail shaft adopts a supporting structure. The two shafts are connected by a vertical cyclone separator, and the lower part of the separator is connected with a return device and a ash cooler. There are anti-wear lining inside the combustion chamber and separator, pipe-laying furnace wall for the front shaft, external metal guard plate, light furnace wall for the tail shaft, and all the weight of the boiler is borne by eight steel pillars.
Biomass CFB Boiler uses under-bed ignition (oil or gas), staged combustion, primary air ratio accounting for 50-60%, fly ash circulation for low rate, medium temperature separation of ash and slag discharge using dry, respectively by water-cooled screw slag dis-charger, ash cooler and dust collector hopper discharge. Furnace is the key to ensure full combustion of fuel. Turbulent bed is used to make fluidization rate 3.5-4.5 m/s, and appropriate furnace cross section is designed. Thin lining (high alumina brick) is laid on the furnace membrane wall tube. Even when the boiler burns different fuels, the combustion efficiency can be maintained above 98-99%.
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