循环流化床2（Circulating fluidized bed 2）.docVIP

循环流化床2（Circulating fluidized bed 2） The bottom is a lot of hot ash and coal particle mixture, combustion air through the air distributing plates at the bottom of the furnace evenly into the fluidized bed, in a fluidized bed air rising speed is about 2 to 5m/s, most of the particle flow up into the boiling state, particle movement, mixing is very strong, this phenomenon is called flow. The coal is fed into the furnace by the coal feeder, and the coal particles entering the furnace are soon mixed with the high temperature bed material. The coal particles are heated rapidly, and the fire is dry and ignited. After an average of 10 to 10 minutes in the fluidized bed, the slag discharge port is discharged from the furnace. The fluidized bed heat capacity, strong mixing, particle residence time and other factors, not only can burn high temperature fluidized bed boiler of coal, and other furnace type (such as chain furnace, pulverized coal furnace) low calorific value, not burning low volatile, high ash content of low-grade fuel, such as coal, anthracite, coal gangue, oil shale, slag and other steam can stable combustion in fluidized bed boiler. There are environmental advantages of fluidized bed boiler, by adding limestone or dolomite into the furnace can greatly reduce sulfur dioxide in the flue gas, a simple and effective method to solve the problem of air pollution caused by coal. But the exhaust gas desulfurization technology of general chain boiler and coal powder furnace is expensive and difficult to popularize. It is almost impossible to be used in medium and small industrial boilers. The combustion temperature of the fluidized bed boiler is 900~1000 degrees centigrade, which is lower than that of the chain boiler and pulverized coal boiler, which inhibits the formation of NOX, and has less content of NOX in the flue gas, which is beneficial to the protection of the environment. Our country has thousands of Taiwan for boiler burning inferior coal, but they all belon