Before the appearance of biomass briquetting machine, people usually burned the straw produced after the harvest of crops, and the burning of straw would produce a lot of black smoke, which seriously polluted the environment. It is a well-known fact that the burning of straw will produce black smoke, so some briquetting machine customers ask whether the briquetting produced by biomass briquetting machine will produce black smoke when burning.

First, let’s analyze why ordinary straw burning produces black smoke:

Straw is loose, and its volatile content is high. Generally, combustible volatiles produced by thermal decomposition can release about 80% at 350℃. This period of time is short, and general rural stoves can’t provide a large amount of air for combustion. In natural ventilation, the oxygen diffusion rate is slow, and unburned organic volatiles are taken away by airflow to produce black smoke. When the volatiles are gradually burned out, because the structure of the carbon after the straw loses volatiles is loose skeleton, the movement of air flow can make it disintegrate, and some unburned carbon particles are wrapped in the flue, resulting in flying black flocs. When the volatile and carbon gradually burn out, the space-time air volume will be surplus, and the excess air will take away part of the heat in vain. The combined effect of these effects will greatly reduce the thermal efficiency.

Let’s take a look at the situation of straw briquettes:

Generally, the burning of biomass briquetting machine can say goodbye to black smoke, mainly because the carbon structure of the finished product after processing is compact and the density is uniform, which greatly limits the generation of volatile substances, prolongs the burning time, and the burning rate reaches more than 95%, and the volatilization rate is reduced to less than 0.05%. The oxygen demand of the whole combustion process does not fluctuate greatly, which makes the combustion process relatively stable.

As long as the briquettes produced by the biomass briquette machine are reliable in quality, and the briquettes are operated in a standardized way during combustion, straw briquetting fuel can generally bid farewell to black smoke. However, some customers have reported that black smoke is produced during the use of briquetting fuel. We will introduce the reasons in detail next time.