Rice Straw Briquetting-Biomass Pellet Machine

I. What is a Rice Straw Biomass Pellet Machine?

A rice straw Biomass Pellet machine processes loose rice straw through a sequence of steps—crushing, moisture conditioning, high-pressure thermal compaction, and cooling—to produce high-density briquettes suitable for use as fuel or animal feed. This process reduces the material's volume by 8 to 10 times, greatly facilitating storage, transportation, and resource utilization.

🥕II. Briquetting Principle (Additive-Free)

Physical Compression: Pressure rollers or a ring die apply high pressure (50–150 MPa), causing the fibers to interlock tightly.

Thermal Bonding (Key Factor): Frictional heat raises the temperature to 70–110°C, causing the lignin within the straw to soften; upon cooling, it solidifies to form a cohesive briquette.

Moisture Regulation: A moisture content of 20–25% is optimal; if too low, the material is difficult to form; if too high, the resulting density is poor, and the briquettes are prone to crumbling.

🍁III. Standard Process Flow

Collection and Impurity Removal: Dry rice straw is collected and cleared of contaminants such as mud, plastic films, and ropes.

Crushing and Shredding: The straw is chopped into lengths of 20–50 mm to ensure the fibers are thoroughly separated and loosened.

Moisture Conditioning:

Wet Material: Sun-dried or mechanically dried to achieve a moisture content of 20–25%.

Dry Material: Sprayed with water to replenish moisture, then thoroughly mixed and left to rest for 4–8 hours.

High-Pressure Molding:

Ring Die Briquetter: Pressure rollers force the material into the die holes, extruding long, cylindrical briquettes (φ30–80 mm).

Hydraulic / Screw Press: Material is advanced via reciprocating or continuous motion to form square or round briquettes.

Cooling and Curing: The discharge temperature is approximately 80–100°C; the briquettes are spread out to cool until their moisture content drops to ≤14%, at which point their structural strength stabilizes.

Packaging and Storage: Briquettes are bundled or bagged for storage in a moisture-proof environment.

🍃IV. Key Parameters (Practical Reference)

Raw Material: Rice straw; length ≤50 mm; moisture content 20–25%.

Molding Temperature: 80–120°C (generated via frictional heat or electric heating).

Briquette Density: 0.8–1.2 g/cm³; calorific value approximately 3500–4500 kcal/kg. Specifications: Round blocks φ30–80 mm, length 50–200 mm; Square blocks 50×50×100 mm.

Capacity: Small-scale 200–500 kg/h; Medium-scale 1–3 t/h; Large-scale 5–6 t/h.

🍂V. Comparison of Common Machine Models

Ring-Die Briquetting Machine: High output, durable; suitable for fuel production; density: 0.8–1.2 t/m³.

Hydraulic Briquetting Machine: High pressure, high density; suitable for animal feed / high-density fuel; density: 1.0–1.3 t/m³.

Screw Extruder: Simple structure, low cost; suitable for small-scale workshops; density: 0.6–0.9 t/m³.

🌳VI. Common Issues and Solutions

Failure to Form / Loose Structure: Moisture content <18% (add water); Insufficient pressure (adjust die clearance / increase pressure); Low temperature (increase rotational speed / activate heating).

Cracking / Crumbling: Moisture content >28% (dry material); Cooling too rapidly (extend cooling/spreading time); Fibers too short (adjust pulverizing fineness).

Die Clogging: Uneven moisture distribution (mix thoroughly); Excessive impurities (remove impurities); Worn die holes (repair or replace die).

🍀VII. Applications and Value

Biomass Fuel: A substitute for coal, used in boilers, heating systems, and power generation; features zero CO₂ emissions.

Animal Feed: High density, easy to store; suitable as feed for ruminants such as cattle and sheep.

Organic Fertilizer / Substrate: After composting/maturation, serves as organic fertilizer or a substrate for seedling cultivation.

Environmental Benefits: Reduces the burning of crop residues (straw), lowers PM2.5 levels, and facilitates the resource-efficient utilization of waste materials.

🥕If you are interested in our biomass pellet machine,please tell me:

1.What is the material of pellet? What is the moisture content?

2.What about your requirement for the production capacity per hour and the size of pellet?

3. How about the voltage and frequency in your local place?

I will recommend a suitable machine model for you.🥰

🎉Any interesting with our Biomass Pellet Machine, please contact with me.