Straw briquettes

Straw briquettesCurrently Biofuel is gaining high popularity in EU and Latvia – including straw and hay briquettes.

Every year agricultural food industry produces a lot of green waste, which is successfully processed and used in biofuel manufacturing. Straw is one of the biggest green waste potentials in Latvia.

Researches have proved that during the burning process the highest heat index from straw at 15% moisture reaches 16.8 – 18.3 MJ depending on the kind, but from wood it is 20.5 – 23.1 MJ/kg.

The characteristics of straw briquettes are similar to wood fuel, but the significant difference is in the distribution of raw material and that straw is renewable in a shorter time.

Straw, at up to 15% moisture, is chopped into 1 – 5 cm long pieces. If the moisture content is higher, it causes high vapour emission resulting in lower density as well as lower mechanical durability of briquettes. The finer is straw fraction, the denser and more durable is a briquette.

One of the most characteristic features of straw briquettes is low ash content – approximately only 5%. Besides that, they contain a lot of valuable nutrients – particularly potassium, magnesium, phosphorus and calcium, so the briquettes can be used for other purposes as well, for example, as a fertilizer in agriculture.

Straw briquettes are very clean and easy to store; they are without harmful leftovers and suitable for all types of furnaces and fireplaces. They have low moisture content and high thermal value. Straw briquettes have to be pressed densely – that is one of the quality indexes.