The high moisture content of biomass pellets will increase the weight of biomass pellet suppliers, but once put into the combustion of biomass boilers, it will seriously affect the combustion of the boiler, which will cause the furnace to deflagrate and generate flue gas, which is too intrusive. The carbon content is too high, reducing boiler efficiency. Biomass boilers, because they cannot adapt to the introduction of biomass pellet fuel with a moisture content of more than 20% into the furnace, if the biomass pellet fuel with high moisture content enters the biomass boiler for combustion, the following problems will occur:

1. The boiler burns under positive pressure and the carbon content in the ash is high:

When the boiler is under high load, water vapor is first formed in the boiler to release heat, followed by the process of combustion and heat release. In the form of frequent boiler positive pressure. The large amount of water vapor in the boiler lowers the temperature of the furnace. The added oxygen is surrounded by water vapor to form a barrier, and it is difficult to mix well with the flame, resulting in insufficient oxygen during combustion. If it increases, it will inevitably lead to an increase in flue gas velocity. The flue gas penetrating the flame in the furnace will flow rapidly, which will affect the stable combustion of the boiler, resulting in insufficient combustion time in the furnace and escaping a large amount of combustibles.

2. Tail fly ash with sparks: Since a large amount of unburned fly ash enters the tail flue, when the dust before dust collection and the ash stored in fly ash are stored, the hot fly ash will come into contact with the air, and you will See obvious Mars. It is easy to burn the bag of the dust collector and accelerate the wear of the impeller of the induced draft fan.

3. High-load biomass boilers are difficult:

Increasing the load on the biomass boiler requires increasing the amount of feed and air. The higher the load, the greater the disturbance in the furnace. When burning low calorific value and high moisture fuels, expanding aerosols can fill the furnace far beyond the limits allowed by the boiler design. The boiler does not have enough space to accommodate the endothermic and exothermic processes, and the amount of flue gas produced can change drastically immediately. Under extremely strong disturbances, positive and negative pressure fluctuations will form, resulting in significant dynamic imbalances. Under such operating conditions, a high boiler volume heat load cannot be formed, the combustion intensity is insufficient, the heat required to meet the high load cannot be generated, and combustible ash is generated due to insufficient combustion.