1. Combustion mode
Circulating fluidized bed coal-fired boiler is the coal through the crushing equipment, through the belt into the coal bunker, through the coal feeder use of coal sowing air, into the furnace; through circulating ash heating, fluidized combustion process. After changing coal to gas, coke oven gas and purge gas are mixed and injected into four burners for direct combustion.
2. Combustion products
Coal is mainly composed of C, h, O, N, s and other elements, ash and moisture. After coal combustion gives off heat, it generates SO2, SO3, NOx ash and moisture, while SO2, SO3 and NOx are discharged into the atmosphere by flue gas, polluting the environment and causing harm to human beings. The main components of natural gas are CO and H2. After combustion, they mainly generate CO2 and H2O, which are much less than the emission of SO2, SO3 and NOx from coal-fired boiler and gas-fired boiler.
3. Ventilation mode
The coal-fired boiler generally adopts negative pressure combustion, and the basic combustion process is completed by the cooperation of blower and induced draft fan. In the combustion process of coal, a large amount of air is required. Due to the air leakage of furnace wall flue, the excess air coefficient can reach 2.1-2.5. The gas-fired boiler adopts micro positive pressure or micro negative pressure combustion, which requires small air volume and can be premixed with natural gas in the burner. Micro positive pressure combustion has no air leakage factor of furnace wall and flue, and the air coefficient of flue outlet can be 1.05-1.2 during operation.
4. Fuel explosibility
The combustion of coal-fired boiler is safe and the furnace is not easy to explode. However, the gas-fired boiler will explode in case of open fire within the explosion concentration limit. High risk.
5. Boiler automatic control
Due to the coal type, material layer thickness, blast volume, induced air volume, air coal ratio and other reasons, it is difficult to automatically adjust the boiler operating parameters according to the load. The gas-fired boiler is affected by less factors, so the size of burner valve can be adjusted according to the load, which is easy to realize automatic control.
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