Guide: Biomass boilers and coal-fired boilers are classic industrial boilers. Both can be used for industrial production and heating. They have a wide range of uses. What are the differences between the two types of boilers? The biomass boiler sometimes emits black smoke when it is running. Why does this happen?
Biomass boilers and coal-fired boilers are classic industrial boilers. Both can be used for industrial production and heating. They have a wide range of uses. What are the differences between the two types of boilers? The biomass boiler sometimes emits black smoke when it is running. Why does this happen?
1. The difference between a biomass-fired boiler and a coal-fired boiler
1. The essential difference between biomass pellet burning boilers and coal burning boilers is whether they are environmentally friendly boilers.
2. Boiler structure. Coal-fired boilers are divided into chain grate coal-fired boilers and fluidized bed coal-fired boilers, while biomass pellet boilers are divided into biomass chain grate boilers and biomass circulating fluidized bed boilers.
3, the difference between fuels, biomass-fired boilers can either burn coal or biomass energy, while coal-fired boilers are boilers that can only burn coal.
4. Bio-particle combustion boilers have been considered environmentally friendly and energy-saving boilers that can be vigorously promoted from the very beginning, while coal-fired boilers of 10 tons and below are blocked in a controlled environment.
Among the solid fuels, biomass boilers and coal-fired boilers have two major advantages: one is environmental protection, which is also the original intention of the invention of biomass boilers. Burning biomass fuels can reduce the emissions of sulfur dioxide and nitrogen oxides, and can also eliminate various plants. Straws reduce the flue gas produced by burning straws; second, biomass fuels are easier to control than coal burning, because biomass fuels are easier to ignite and burn faster than coal. During intermittent operation, the coal-fired boiler must be kept on fire when it is shut down, which means that fuel must be consumed, otherwise it will extinguish the fire. The biomass fuel boiler can extinguish and ignite at any time, and it can also realize automatic ignition. This is the advantage of biomass boilers. The disadvantage is that the current price of biomass fuel is too high, and the operating cost of a boiler is about 30% higher than that of a coal-fired boiler.
2. the reason for the burning of biomass boilers and black smoke
When the biomass pellet fuel is ignited, the pellets are slowly carbonized and the combustion is incomplete, producing water vapor, carbon monoxide, carbon dioxide and other flue gas mixed with hydrocarbons and nitrogen oxides. These flue gases are removed by the action of blasting and phoenix induction. It is discharged into the atmosphere through the boiler flue and chimney, so we will see black smoke from the boiler.
When the biomass particles in the boiler are completely burned, the temperature in the furnace is as high as 800-1000 degrees, or even higher. The volatiles such as water and ash contained in the boiler fuel are rapidly carbonized and burned at high temperatures, resulting in carbon monoxide and other combustible hydrocarbons. Compounds, nitrogen oxides and oxygen are converted into incombustible gases on time. The impurities in the black smoke have been burned out at high temperature, so that no black smoke can be seen. This is what everyone says is no smoke.
There are many reasons for the black smoke in the biomass boiler:
1. Biomass pellet fuel is of poor quality and contains many impurities;
2. The boiler feeds too fast and the combustion is insufficient;
3, the ashes have not been cleaned;
4, the use of time is long, the smoke pipe is blocked;
5. The chimney installation is unreasonable and the flue resistance is large.
The above introduces the difference between biomass boilers and coal-fired boilers and the reasons why biomass boilers burn black smoke. If you encounter similar situations, you can refer to the solution to ensure that the boiler can operate safely and stably. If you have a boiler purchase plan, you must first implement the local environmental protection requirements and purchase the boilers with environmental protection requirements to ensure that the boiler can be purchased and used smoothly.