1. combustion mode
The circulating fluidized bed coal-fired hot blast stove is the coal through the crushing equipment, through the belt into the coal bin, through the coal machine using the coal sowing wind, sprinkled into the furnace; through the circulation of ash heating, fluidized combustion process. After the coal is converted to gas, the coke oven gas and the vent gas are mixed and mixed into four parts by direct combustion.
2. combustion product
Coal is mainly composed of C, H, O, N, S and other elements and ash and water composition. After coal burning and releasing heat, it generates SO2, SO3, NOx ash and water, and SO2, SO3 and NOx are discharged into the atmosphere by the flue gas, polluting the environment and causing harm to the human. The main components of coke oven gas and galloping gas are CO and H2. After burning, the main components are CO2 and H2O, and the emission of SO2, SO3 and NOx is much less than that of the gas hot blast stove of the coal-fired hot blast stove.
3. ventilation mode
The burning process of coal fired hot air is usually carried out by negative pressure, and the basic combustion process is completed by the coordination of the blower and the fan. In the combustion process of coal, a large amount of air is needed, and the excess air coefficient can reach 2.1-2.5 due to the leakage of the furnace wall flue. Gas-fired hot-blast stove uses micro-positive pressure or micro-negative pressure combustion, which requires less air volume, and the air in the burner can be better premixed with natural gas. Micro positive pressure combustion has no air leakage factor of furnace wall and flue. The air outlet coefficient of flue gas in operation can be 1.05-1.2.
4. fuel flammability
The combustion of coal fired hot blast stove is safe, and the furnace is not easy to explode. And the gas hot stove will explode when it meets the open fire within the limit of explosion concentration. The danger is great.
Automatic control of 5. hot air furnace
Because of the coal, the thickness of the material layer, the amount of air blast, the ratio of wind coal and the ratio of wind coal, it is difficult to automatically adjust the operating parameters of the hot blast stove according to the load. The gas stove has less influence factors, and can adjust the burner valve size according to the load, so it is easy to realize automatic control.
The actual transformation and operation analysis of the coal to gas hot blast stove are carried out. The technical index of the reformed hot blast furnace, the combustion characteristic indexes all meet the design requirements, and can realize the integration of the use and monitoring, which greatly reduces the potential danger of the hot blast stove. At the same time, on the basis of reducing the cost of buying new furnaces, the emission of gaseous pollutants is reduced. The win-win of economic and environmental protection has been realized.
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