Straw Screening Machine

In the whole production process of biomass pellets making plant, the purity of raw materials directly affects the normal production, spare parts lifetime, equipment lifespan, production costs, pellet combustion efficiency, etc. Impurities such as sand, soil, stones, and metals mixed in light-weight raw materials like paddy straw, corn stalk, corn cobs, cotton stalks, groundnut shells, mustard stalks, sugarcane bagasse, Napier grass, etc. Without impurities removed, it will cause problems as damaged to the pellet mill, increase the energy consumption, bad quality pellet, etc.

Straw Purification Machine, as a prescreening device for pellet making from agricultural waste, uses efficient air flow sorting technology to provide pure raw materials for subsequent processes such as crushing, drying, and pelletizing. The Air Trommel Screener is an indispensable prerequisite in a smoothly running plant of biomass pellet making.

1. Why We Adopt a Straw Purification Machine in Pellet Plant?

1.1 Reality

• Impurities damage equipment: Hard impurities such as sand, stone, and metal accelerate the wear of hammer mill blades and pellet mill ring die, increasing production costs.

• Reduce pellet quality: Raw materials with excessive impurity rates produce low-quality pellets with uneven density and lower CV, affecting market price.

• Increase energy consumption & running cost: Without a screener, qualified and unqualified materials mix, increasing ineffective energy consumption during drying and pelletizing, reducing overall production efficiency.

1.2 Solutions

The straw wind separator consists of a vibration mesh screen and air separation device, applying a dual-stage purification system to remove over 95% of impurities from agricultural residues during the pretreatment stage. After sorting and screening, the cleaned and sieved raw materials ensure high-quality pellet production.

1. Raw materials enter the machine via a conveyor system and pass through a vertical air screen cleaner to remove dust and light impurities.

2. Materials then move to a small vibration box with two layers to remove large and small impurities.

3. Next, materials go to a gravity table to eliminate small sticks, stones, soil, and sand.

4. Finally, materials pass through half-back sieves for a final round of impurity removal.

2. The Key Role of Straw Air Classifier in Wood Pellet Production

2.1 Preprocessing Process Positioning

The air classifier is installed before the hammer mill, directly connected to the straw collection or bagasse conveying link. It forms a complete production line with the silage machine, shredder, hammer mill, dryer, and pellet mill.

2.2 Key Technical Advantages

• Sorting of light materials: Designed for agricultural residues like straw, sugarcane residue, and wood chips, it uses aerodynamic differences to accurately separate impurities such as sand, stone, and metal fragments.

• Three-layer screener + cyclone:

• First layer: Intercepts large particle impurities (e.g., stones, plastic film) and oversized raw materials.

• Middle layer: Wind sorting removes medium-density debris (e.g., soil blocks).

• Bottom cyclone: Adsorbs dust by centrifugal force to ensure raw material cleanliness.

• Seamless connection with pellet production equipment: Sorted raw materials are directly conveyed to the hammer mill or rotary dryer, reducing material loss in intermediate links.

3. Typical Application Scenarios

Rice Straw Pellet Production Line

A client using paddy straw as raw material chose the Straw Screening Machine. The sorter effectively removes impurities such as stones, soil, and sand, while separating different sizes of paddy straw for optimal processing.

4. Why Choose YuFChina Straw Wind Selection Machine?

• Specialized experience in the biomass industry: The equipment is optimized for lightweight raw materials like straw and sugarcane residue, with sorting efficiency 30% higher than ordinary equipment.

• Technical support: Provides one-stop services for process design, equipment installation, commissioning, and operator training.