The RIECO Besan Grinding System is a fully automated, hygienic, and high-efficiency turnkey solution
designed for producing premium-quality gram flour from Bengal gram (chickpeas).
Leveraging RIECO's 50+ years of grinding expertise, the system integrates milling, sieving, dust
control, and packing into one seamless workflow. With precise particle size control and low heat
generation, it preserves natural color, aroma, and protein content required for both traditional food
markets and modern FMCG clients.
Design and Working Principle
The Besan Grinding System follows a staged, controlled size-reduction process to achieve 100–500 microns (Gargara, Fine & Super-Fine) with hygienic operation and minimal product loss.
Stage 1: Feed Hopper + Feed RAL (Rotary Air Lock)
- Chana Dal / pre-crushed material is loaded into the Feed Hopper.
- A Feed Rotary Air Lock ensures controlled, uniform material dosing into the system.
- It also maintains air sealing, preventing false air entry into the mill and ensuring stable airflow.
Stage 2: ACM Mill (Grinding + Classification)
The ACM Mill is the heart of the Besan system and carries out both fine grinding and particle classification in a single pass.
Grinding Action
- Material enters the grinding chamber where a high-speed rotor impacts and pulverizes the product.
- The high velocity of air through the chamber maintains cool grinding (<10°C rise), preserving besan colour and aroma.
Integrated Classification
- A dynamic classifier wheel rotates at controlled speed to determine the cut-point.
- Fine particles pass through the classifier.
- Coarse particles are rejected and re-circulated for further grinding, giving uniform mesh output.
Output Mesh Range
- Suitable for Gargara, Fine, and Super-Fine Besan (100–500 Microns).
Stage 3: Interconnecting Ducting
- Carries the air-material mixture from ACM to Bag Filter.
- Designed for smooth airflow, minimum pressure drop, and hygienic transfer.
- Fabricated in SS/MS as required for food safety.
Stage 4: Bag Filter (Dust Collection + Fine Product Recovery)
- The air-material stream enters the Pulse Jet Bag Filter where the fine besan powder is separated.
- Filter bags ensure >99% collection efficiency with negligible dust emission.
- Pulse Jet cleaning maintains stable differential pressure and consistent airflow.
Stage 5: Discharge RAL
- The collected besan is discharged through a Rotary Air Lock into the product bin/packing system.
- Prevents air leakage from the Bag Filter and maintains proper suction in the system.
Stage 6: Centrifugal Fan (C-Fan)
- The C-Fan provides the required airflow through the mill, ducts, and bag filter.
- Ensures:
- Efficient transportation of fines
- Stable classification performance
Stage 7: Control Panel (MCC/PLC Based)
- Houses starters, drives, automation logic, and safety interlocks.
- Functions include:
- Feed RAL speed control
- Classifier RPM control (VFD driven).
- Fan airflow control.
- Bag filter pulse sequencing.
- Temperature and motor load monitoring.
- Safety interlocks for airflow, doors, and overload.
- Optional HMI/PLC enables recipe-based operation and real-time monitoring.
Model Description
| Variant | Mill Model | Total Power in HP | Capacity |
|---|---|---|---|
| BS-15-MS | ACM 15 MS | 25 | 120-150 kg/hr |
| BS-15-SS | ACM 15 SS 304CP | 25 | 120-150 kg/hr |
| BS-30-MS | ACM 30 MS | 59 | 450-500 kg/hr |
| BS-30-SS | ACM 30 SS 304CP | 59 | 450-500 kg/hr |
| BS-60-MS | ACM 60 MS | 127 | 900-1000 kg/hr |
| BS-60-SS | ACM 60 SS 304CP | 127 | 900-1000 kg/hr |
Key Components
| Component | Function | Key Technical Features |
|---|---|---|
| Feed Hopper + Feed RAL (Rotary Air Lock) | Hold material and ensures controlled, uniform feeding into the mill | Maintains air sealing, prevents false air entry, supports consistent feed rate |
| ACM Mill (Air Classifying Mill) | Performs fine grinding and internal air-classification in a single pass | Cool grinding (<10°C rise), screen-less design, adjustable classifier RPM for mesh control |
| Bag Filter (Pulse Jet Type) | Separates fine besan powder from conveying air and ensures dust-free operation | >99% collection efficiency, food-grade filter bags, automatic pulse cleaning |
| Discharge Hopper + RAL | Collects finished besan and discharges it to packing or downstream equipment | Provides airlock, ensures dust-free discharge and maintains suction in system |
| Centrifugal Fan (C-Fan) | Generates required airflow through ACM, ducting, and bag filter | Ensures cooling during grinding, stable classification |
| Control Panel (MCC/PLC Based) | Controls and synchronizes all equipment for smooth and safe operation | Classifier speed control, feed control, bag filter pulse logic, safety interlocks, overload protection |
Features & Benefits
Process Benefits
- Uniform particle size with exact mesh control
- Low heat generation → preserves aroma, color & nutritional value
- Screen-less operation → no choking or frequent stoppages
- Higher yield & low wastage
Hygiene & Safety Benefits
- SS304/316 contact parts available
- Dust-free environment with >99% collection efficiency
Operational Benefits
- Fast changeover between grades (Gargara / Fine / Super Fine)
- Lower power consumption vs. traditional pulverizer
- Stable performance with automated controls
Applications
- Besan (Gram Flour)
- Sattu
- Ladu Besan
- Premium Fine Besan for FMCG
Model Variants
| Variant | Mill Model | Total Power in HP | Capacity |
|---|---|---|---|
| BS-15-MS | ACM 15 MS | 25 | 120-150 kg/hr |
| BS-15-SS | ACM 15 SS 304CP | 25 | 120-150 kg/hr |
| BS-30-MS | ACM 30 MS | 59 | 450-500 kg/hr |
| BS-30-SS | ACM 30 SS 304CP | 59 | 450-500 kg/hr |
| BS-60-MS | ACM 60 MS | 127 | 900-1000 kg/hr |
| BS-60-SS | ACM 60 SS 304CP | 127 | 900-1000 kg/hr |
Technical Parameters
| Characteristic | Specification |
|---|---|
| Moisture Limit | < 8% |
| Temperature Rise | < 10°C |
| Power Consumption | Range of 20 – 365 HP — depends on capacity required. |
| Final Product Color Index | Natural yellow retained |
Frequently Asked Questions (FAQ)
Q: How do you maintain the natural color and aroma of besan?
A: ACM air-cooled chamber prevents heat rise and maintains product quality.
Q: Can the system achieve multiple fineness grades?
A: Yes, meshes from 80–300 can be produced by adjusting classifier speed.
Q: Is the system suitable for FMCG-level hygiene?
A: Yes, food-grade stainless steel and dust-free operation ensure compliance.
Q: What about cleaning between batches?
A: Quick-release construction allows rapid cleaning; CIP optional.
Additional Frequently Asked Questions (FAQs)
Q: How do you ensure consistent mesh size across batches?
A: The ACM/RACAM system uses a variable-speed dynamic classifier that automatically recirculates coarse
particles while passing only fine particles, ensuring consistent mesh sizes (80–300).
Q: Will the system overheat the material during grinding?
A: No. RACAM's air-cooled grinding chamber limits temperature rise to 8–10°C, preserving aroma, color, and protein quality.
Q: Can one machine produce fine besan, ladu besan, and sattu?
A: Yes. By adjusting classifier RPM, feed rate, and sieve configurations, multiple grades can be produced with minimal downtime.
Q: What is the recommended moisture content for chana dal?
A: Ideally ≤12%; higher moisture may cause smearing, clogging, and reduced grinding efficiency.
Q: Is the plant suitable for export-grade or FMCG-standard besan?
A: Yes. RIECO systems meet FSSAI, HACCP, and food-safe material guidelines, with SS304/316L contact parts.
Q: What are typical power requirements for besan grinding systems?
A: For capacities of 200–5000 kg/hr, power ranges from 40 HP to 365 HP, optimized in ACM systems.
Q: How long does cleaning and changeover take?
A: With quick-release clamps and smooth liners, cleaning takes 15–30 minutes; CIP is optional.
Q: Can the system minimize dust and maintain hygiene?
A: Yes. Cyclone + Pulse Jet Bag Filter ensures >99% dust collection and clean operation.
Q: How do you maintain product uniformity in continuous operation?
A: Automated controls regulate feed rate, classifier speed, and airflow, ensuring batch-to-batch uniformity.
Q: Can the plant be integrated into an existing production line?
A: Yes. RIECO systems support modular integration with conveyors, silos, cleaning lines, and packing machines via PLC automation.