What is the function of fluidized fan in circulating fluidized bed boiler?

Circulating fluidized bed boiler (CFB) is a fluidized combustion boiler. Its main structure includes combustion chamber and circulating furnace. It has many advantages such as high thermal efficiency and low pollution, and is especially suitable for biomass fuel and inferior coal. During use, all parts of the boiler are playing their respective roles.

Function of fluidized fan in circulating fluidized bed boiler

The working process of circulating fluidized bed boiler is to send air into the furnace by primary air, mainly to fluidize the materials in the furnace, and at the same time provide oxygen needed for fuel combustion in dense phase area at the lower part of the furnace. At the same time, through the secondary fan, the oxygen needed for fuel combustion in the furnace is provided, the mixing of materials is strengthened, and the temperature distribution in the whole furnace is also analyzed. The flue gas burned in the furnace will circulate and burn the incompletely burned flue gas through the circulating ash separator, fly ash return device, etc. The waste gas will finally pass through the dust collector and be discharged into the atmosphere through the induced draft fan. Therefore, the fluidizing fan of circulating fluidized bed boiler is used to feed back and fluidize the bed material in the furnace, which is supplied by primary air.

Reasonable setting of fluidized air in circulating fluidized bed boiler to improve thermal efficiency

As a professional manufacturer of circulating fluidized bed boiler, ZOZEN Boiler designs the boiler structure and system, and makes the fluidization air volume of circulating fluidized bed boiler match the fuel quantity to ensure the combustion economy. In addition, the positive circulating fluidized bed boiler has the following advantages:

1. Circulating fluidized bed (CFB) is a low-temperature combustion, with low emission of nitrogen oxides, which can be lower than 150mg/Nm³ or even 100mg/Nm³. And can realize direct desulfurization in the combustion process, with high desulfurization efficiency.

2. The fuel has wide applicability and high combustion efficiency, reaching over 89%, especially suitable for low calorific value inferior coal and biomass bulk materials.

3. The load adjustment range is large, and the low load can be reduced to about 30% of the full load.

4. Optimize the separator structure, effectively improve the separation efficiency, so that the carbon content of boiler fly ash is less than 6%, and the carbon content of bottom slag is less than 2%.

5. Select the appropriate fluidization velocity, optimize the anti-wear measures of each heating surface in the furnace, and ensure that the heating surface in the furnace runs for a long time without wear and the exhaust gas temperature is stable. The annual operation time of ZOZEN's boiler is not less than 8,000 hours, and the continuous operation time is not less than 7,000 hours.

6. High degree of automation, convenient maintenance, and less operation and maintenance personnel.

ZOZEN's circulating fluidized bed boiler products are divided into DHX series circulating fluidized bed steam boiler, SHX series circulating fluidized bed steam boiler, SHX series circulating fluidized bed hot water boiler and QXX series low nitrogen circulating fluidized bed hot water boiler.