Processing technology of straw briquette fuel is the process of extruding crushed straw raw materials into briquette fuel by straw briquette machine.

The processing of straw molding fuel should go through several steps, such as air drying, crushing, stacking and recycling, moisture regulation, compression molding, cooling and drying, metering and packaging.

Air drying.

Because the just harvested straw has a lot of water, it is not suitable for crushing. Therefore, the harvested straws are first aired and naturally dried. After a period of drying, the moisture content of the straw raw material is reduced to below 40%, and then it can be crushed.  

Smash.

According to the requirements of briquetting equipment for raw materials, straw should be crushed.

Accumulation.

The crushed straw raw materials have to be stacked and recycled, in order to make the dry humidity of the raw materials more uniform and ensure the stability of briquetting. Too wet or too dry raw materials will affect the straw molding.

Wet and dry regulation.

Generally, the moisture content of raw materials is required to be 15%-20% when making straw briquettes, so the materials should be dried or humidified before processing with straw briquette machine.

Extrusion molding.

The crushed materials are processed by a straw briquetting machine. In the process of overstocking, the machinery runs at a high speed, generates heat by mutual friction with the materials, and is heated externally. When the temperature reaches 200-300 degrees Celsius, lignin in the straw raw materials will undergo a series of reactions such as softening and bonding, and will be extruded by a die to make fuel with a block or a specific shape.

Drying.

The temperature of the formed fuel just extruded is high, and its shape is not stable enough, so it is easy to be broken. Therefore, the method of natural cooling and drying on the conveyor belt is generally adopted for cooling and drying. If conditions permit, a cooler can be installed to take away the heat and moisture in the fuel, so as to ensure the shape stability of the briquetted fuel.

Metering and packaging.

After the molded fuel is cooled and dried, it can be metered and packaged for storage and transportation.