Why is the coking of the circulating fluidized bed boiler too thin?
The bottom of the fluidized bed is equivalent to a large heat storage pool, which is mixed with coal. When stabilized at a temperature point, there is a balance between the amount of ash and the amount of coal fired by the two.
As the material layer is too thin, the uneven distribution of the material layer, the furnace temperature is difficult to control, once the temperature increases, it will lead to coking.
When the material layer is too thin, that is, the amount of ash is less, and at this point, if the original amount of coal is added, it will break the balance, the bed temperature will rise rapidly and difficult to control, easily lead to coking. When the material layer is too thin, the amount of coal added shall be greatly reduced, and the amount of coal can be controlled according to oxygen and other parameters. When the material layer is too thin, it will cause some phenomena such as blowing and flowing, which will lead to the weakening of the local fluidization and lead to the coking accident.