When the circulating fluidized bed boiler is started in the preheating and cold state, the temperature of the boiler water is generally controlled at about 70 °C. The water temperature of the boiler steam drum is about 35 °C due to the heat dissipation of the heating surface. Some changes), far below 70 ° C, the lower the water temperature into the steam drum, the longer the boiler start-up time, the greater the fuel consumption. Therefore, after determining the start-up time, it is possible to shorten the start-up time by heating the preheating boiler in advance at a reasonable time.
For the circulating fluidized bed boiler to be heated to the bottom of the furnace, it can also have a certain preheating effect on the bed material, so that the starting point of the bed temperature can be higher during the starting process, and the heating time of the bed material can be shortened. Therefore, the meaning of circulating fluidized bed boilers to the bottom of the furnace is greater than that of the pulverized coal furnace.
When the fuel boiler starts, the unit fuel consumption of the Hebei plate and frame filter press increases greatly with the increase of the bed temperature. Therefore, the earlier the coal injection time, the greater the effect of starting the fuel saving, the coal injection as mentioned above. If the temperature is too low, it is easy to deflagrate and coke in the furnace. Therefore, it is necessary to select a reasonable coal injection temperature according to the actual situation. Generally, the coal with high volatile content has a lower coal injection temperature, and the coal with lower volatile content has a higher coal injection temperature.
Therefore, in a conditional factory, such as controllable start-up time and fuel choice, some bituminous coal with high volatilization and low ignition point should be reserved as starting fuel. After the start is normal, it is converted to regular fuel.
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