EBICO News

Characteristics of biomass fuel combustion
Due to the different characteristics of biomass fuel compared to fossil fuels, there are significant differences in the combustion mechanism, reaction rate, and composition of combustion products between biomass fuel and fossil fuels during the combustion process. The characteristics of its combustion process include:
1. Biomass has a high moisture content, and combustion requires a higher drying temperature and longer drying time, resulting in a larger volume of flue gas and higher heat loss from exhaust gas.
2. Biomass fuel has a low density, a relatively loose structure, a large windward area, and is easily blown up, resulting in a higher proportion of suspended combustion.
3. Due to the low heat generation of biomass and the low temperature field inside the furnace, it is difficult to organize stable combustion.
4. Due to the high volatile content of biomass and the low ignition temperature of fuel, a large amount of volatile matter is usually precipitated and begins to burn violently at temperatures between 250 ℃ and 350 ℃. If the air supply is insufficient at this time, it will increase the chemical incomplete combustion loss of the fuel, and the smoke will be black, and in severe cases, it will be thick yellow smoke.
In general, coke is surrounded by volatile matter, and oxygen in the combustion chamber is not easy to penetrate the surface of coke. Only when the combustion of volatile matter is about to end, the temperature of coke and its surroundings is already high, and oxygen in the air may also come into contact with the surface of coke, causing it to start burning and continuously produce ashes.
6. After the volatiles are released and burned out, the combustion speed of coke particles is slow and difficult due to the influence of ash wrapping and air infiltration. If appropriate necessary measures are not taken, it will lead to more residual carbon in the ash, increasing the loss of mechanical incomplete combustion.