How Probat Roasting Factories Control Emissions & Process Coffee

When specialty coffee lovers sip a perfectly brewed cup, few think about what happens behind the scenes in a roasting facility. Yet behind every bag of coffee lies a complex system managing emissions, processing beans, and ensuring quality—from the moment green beans enter until the roasted powder is packaged. How do leading factories like Probat handle this, especially under tightening global environmental rules?

In short, Probat’s advanced roasting plants recycle up to 98% of heat from emissions, filter out carbon compounds like CO and Cx, and use catalytic oxidation at 450–600°C. Their systems also automate bean transport, cleaning, grinding, and storage while maintaining strict quality control through real-time monitoring.

1. Emissions & Exhaust Management

Modern coffee roasting and grinding produce various emissions that must be treated. Roasting releases carbon compounds (Cx), carbon monoxide (CO), and carbon dioxide (CO₂); grinding mainly emits CO₂. To meet environmental standards, these must be filtered and controlled.

Probat employs regenerative thermal oxidation for exhaust treatment. Instead of conventional flame combustion, their no-flame combustion system stores heat from burning off contaminants and reuses 95–98% of it in the roasting cycle. This drastically cuts energy use and ensures emissions stay far below legal limits—even though roasting temperatures reach 900–1000°C.

2. Silver Skin & Byproduct Handling

During roasting, coffee beans shed their outer silverskin. Rather than discard it, Probat systems capture and repurpose it.

The hot roasting gases are used to separate silver skin via centrifugal separators (also called cyclones). The removed silverskin can then be compressed into blocks or pellets. Supporting systems include:

• Silver skin suction systems
• Pelletizing systems
• Granulation units

3. Roast Bean Processing & Transport

Once roasted, beans need to be cleaned, sorted, weighed, and moved efficiently—without damage or contamination.

Transport Systems

Probat offers two main bean conveyance methods:

• Mechanical: Includes belt conveyors, inclined elevators, cable tube conveyors, bucket elevators, and loop-chain conveyors. Best for short, linear paths; lower cost, minimal adjustments needed.
• Pneumatic: Uses low or high-pressure air in closed pipes. Offers flexible routing and multiple drop-off points.

Cleaning & Sorting

Roasted beans are cleaned to remove stones, metals, and dust:

• Stone separators use vibration and airflow to sort beans by weight, leaving stones on the screen.
• High-suction stone removers lift beans and let heavier contaminants fall.
• Metal detectors and dust collectors further refine purity.
• Color sorters identify and remove defective beans by hue.

Weighing & Mixing

After cleaning, beans pass through checkweighers for quality control. For consistent flavor, roasters often blend batches using paddle mixers, drum mixers, or cone screw blenders.

4. Storage, Grinding, and Packaging

Bean Storage

Roasted beans are stored in cylindrical multi-compartment silos (1–100 tons each) or rectangular units. Each silo can store different beans or blends, with rotating distributors guiding beans to a common outlet. This setup supports large-volume storage and customized blending.

Grinding

The UW series of roll grinders from Probat offer precise control over grind size—from coarse to fine—using independent motors per grinding stage. Key features include:

• Adjustable grinding speed for desired particle spectrum
• Turbine mixer and densifier to compact grinds and reduce waste
• Low-residue design for easy cleaning

Coffee Powder Handling

After grinding, powder is transported, blended, stored, and protected:

• Push-pull air conveyor systems move powder using low-oxygen or CO₂ gas to preserve freshness.
• CO₂-based CONTROX systems further prevent oxidation.
• Blending can occur immediately post-grind or pre-packaging.
• For storage, gas-tight tanks filled with CO₂ protect against staleness. Beans rest in the first tank, degas in the second (4–24 hours), then transfer to a third for packaging.

Densification & Quality Add-ons

Optional densifiers adjust powder density post-grind by up to 20%. Additional densifiers can be installed at the packaging stage.

5. Factory Control Systems

Probat’s factories are operated via sophisticated, automated control systems tailored for coffee production.

Roasting Control

• PILOT ROASTER Basic: Semi-automatic, 99-menu system for PROBATONE 50, ideal for small-batch consistency.
• PILOT ROASTER Professional: 999-menu advanced control with touchscreens, color displays, and automatic curve replication. Supports remote permissions and data logging.
• PILOT ROASTER Excellence: Fully automated SCADA-based system with long-term data archiving, learning-mode recipe management, and extended parameter controls.

Grinding Control

• PILOT GRINDER Basic: For PROBATONE 50, 99-menu semi-auto system with clear interface.
• PILOT GRINDER Excellence: Automated control for A2 and SUPERFINE grinders, featuring password protection, SPS integration, and automatic grind adjustment.

Other Control Features

• PILOT PLANT: Scalable factory control system for any production scale, built on Siemens/Allen Bradley modules.
• Online moisture measurement: Non-contact residual moisture tracking (±0.1% deviation), optimizing roast profiles in real time.
• Online color measurement: Monitors roast color stability, improving batch consistency.
• Particle measurement: Optical analysis of ground particle size ensures uniformity and informs automatic grinder adjustments.

Copy & Reflex Functions

Probat’s Reflex Automatic function replicates successful roast curves despite variations in bean moisture or batch size, ensuring consistent results. Reflex Extended pre-calculates curves for faster startups and energy savings.

6. Lab Equipment & Quality Tools

To support R&D and quality assurance, Probat supplies lab-scale tools:

• Sample roasters: Such as the BRZ 2/4/6 (multi-drum, gas/electric) and PRE1 Z / PRG 1 Z (single-drum, 80–100g capacity).
• Laboratory grinders: Models like 55LM1500 (1000g capacity, 1000–1800g/min, ultra-fine grind) support various brew methods.
• Color meters: Colorette 3b provides portable, calibrated color readings with auto-printing.
• Moisture meters: Ensure consistent water content for stable roasting.

Frequently Asked Questions

What emission control system does Probat use in coffee roasting factories?

Probat uses a regenerative thermal oxidation system with no-flame combustion that recycles 95–98% of heat. It treats carbon compounds (Cx), CO, and CO₂ at 450–600°C using catalytic conversion, keeping emissions well below regulatory limits.

How are silver skins handled in Probat’s roasting process?

Silverskins are separated using centrifugal force in cyclones. The extracted material is then compressed into blocks or pellets. Probat also offers suction and granulation systems for further processing.

What types of bean transport systems does Probat offer?

Probat provides both mechanical (belts, elevators, conveyors) and pneumatic (pressurized pipe systems) transport options. Mechanical systems are cost-effective for short distances; pneumatic systems allow flexible routing with multiple delivery points.

How does Probat ensure consistent coffee powder quality after grinding?

Probat uses automated grinding controls (like PILOT GRINDER Excellence), real-time particle size measurement, and optional densifiers. Powders are transferred in CO₂-protected environments and stored in sealed tanks to preserve freshness.

Can Probat roast curves be replicated automatically?

Yes. The Reflex Automatic function replicates successful roast profiles despite changes in bean moisture or batch size. Reflex Extended adds pre-calculation for energy savings and quicker startups.

What laboratory equipment does Probat supply for coffee quality control?

Probat offers sample roasters (e.g., BRZ 2/4/6, PRE1 Z), lab grinders (e.g., 55LM series), colorimeters (Colorette 3b), and moisture meters to support R&D and ensure batch consistency.

Recommended FrontStreet Beans for Roastery Insights

Explore FrontStreet Coffee’s Ethiopia Huakui for bright floral and citrus notes, Yirgacheffe for juicy berry tones, and Brazil Queen Manor for nutty chocolate balance—all roasted with precision akin to Probat’s advanced systems. These single origins highlight how controlled roasting and handling shape flavor. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.