Bulk straw pellet production line:  

Bulk straw was used as raw material, which was pretreated, cured, and extruded into high-density biomass particles. 

Energy-saving and emission reduction have good economic and social benefits. 

Massive straw particles can be widely used in biomass power plants, biomass steam boilers, home fireplaces, drying ovens, and biomass gasifiers, etc.,

which is a kind of efficient and clean renewable energy.

Raw materials:

Mainly bulk straw and lawn grass, etc.

Flow process brief introduction:

The bulk straw is fed into the hammer mill through a belt conveyor, and be ground into fine sawdust. Then,

the raw material with 30% moisture content is dried to about 15% through a three-layer drum dryer,

and finally, granulation processing is performed.

The processed finished pellets are 6-10 mm in diameter,

and the pellets are cooled and packaged by a small bag packing scale 20-50kg/bag for easy transportation and sale.

The bulk straw pellet complete project produces 4 tons per hour of biomass pellets,

the total power of the equipment is about 785kw, the workshop covers an area of 1800m2,

including raw material warehouse and finished product warehouse;

the whole line is compact in design, reasonable in structure, meets environmental protection requirements, 

and can be customized design according to customer requirements.

technological process：

Grinding section—drying section —pelleting section—Cooling & Bagging section

Grinding section:

The hammer mill in the grinding section of the complete bulk straw pellet production line is a water droplet type structure,

side feeding with a forced feeder.

The hammer mill rotor can be operated in forward and reverse directions to improve the service life of the hammer blade;

the direct transmission mode of the motor is adopted, the transmission efficiency is high, and the maintenance is convenient.

The grinding section of the bulk straw pellet complete project consists of a plurality of auxiliary equipment such as cyclone and bag filter,

and the grinding work has no dust discharge. After grinding, it is transported and pneumatic transmission by the fan suction air pressure.

The size of the sawdust is generally about 3-4 mm.

Drying Process:

The complete bulk straw pellet production line is equipped with a three-layer tumble dryer in the drying section,

adopting a three-return form, small floor space occupation, high drying efficiency, small heat loss,

and the heat exchange rate of the dryer is over 90%.

The heating of the dryer is the automatic feeding of the pneumatic conveying equipment,

which eliminates the need for labor and reduces the labor cost of the customer. The sawdust moisture after drying is about 13-18%.

Pelleting section:

MZLH508-L vertical ring die pellet mill is designed in the pelleting section;

the biomass particles are 6-10mm in diameter, and the biomass pellets have high calorific value,

no pollution and low ash, which can be widely used in biomass power plants, biomass steam boilers,

household fireplaces, drying furnaces, and biomass gasifiers.

The complete bulk straw pellet production line has obvious advantages in the pelleting section:

the vertical ring die pellet mill has a simple structure and convenient maintenance, and the ring die adopts a flat structure,

and directly enters the pressing chamber from the feeding inlet, so that the material is much easier to enter the pressing chamber.

It is equipped with variable frequency feeding to make the feeding more even.

Cooling and packaging equipment process:

In the cooling section of the complete bulk straw pellet production line,

we use a cooler to reduce pellets temperature and decrease pellets moisture,

low energy consumption, easy operation, high automatic degree,

through the cooler cooling, pellets temperature is not higher than ambient temperature 5 ℃,

after cooling the pellet’s moisture is around 8-10%, particle density 650-750kg/m³.

Packing scales, according to the local sales needs of customers,

choose the appropriate packing scale for customers to easily sell products,

usually, there are two specifications of small bag and ton bag,

small bag packaging scale is with specifications: 20-50 kg/bag,

ton bag scale packaging is with specifications: 500-1000kg/bag.

The packaging scale has a high automation degree and high packaging precision.

The weighing system is sensor measurement, with high sensitivity and strong anti-interference ability.