A comprehensive FAQ page — answers to questions about price, delivery, financing, ATEX requirements, and the differences between Nawrocki pellet mill models.
The GRB2 880.264 is individually priced and depends on the chosen configuration, optional equipment, transport costs, and the scope of operator training.
The price depends on: the motor variant (2×132 kW vs 2×160 kW), optional equipment (e.g. the ARGAS system for the feed-grade version), ancillary machines in the line (conditioner, cooler, sifter), the delivery country, and the extent of operator training. Contact us to receive a quote tailored to your project.
The GRB2 880.264 is a larger, more energy-efficient machine (die Ø880 mm, up to 4.0 t/h) compared to the GRB1 660 — a smaller model with lower throughput and installed power.
| Parameter | GRB1 660 (indicative)* | GRB2 880.264 |
|---|---|---|
| Die diameter | 660 mm | 880 mm |
| Throughput (forest biomass) | ~1.5 – 2.0 t/h | 4.0 t/h |
| Installed power | ~2×75 – 90 kW | 264 kW |
| Energy consumption | higher than GRB2 880 | 66 kWh/t |
*GRB1 660 parameters are indicative — to be confirmed before publication against the current model data sheet.
Yes — the purchase of the GRB2 880.264 may qualify for white certificates and EU grants for energy efficiency, depending on the audit outcome and available programmes.
The two main routes are white certificates (energy efficiency certificates, requiring an audit) and EU grants for energy efficiency and renewables, announced periodically. Industrial leasing is an additional financing option.
Approximately 3–6 months from contract signing to line commissioning, depending on the machine configuration and scope of installation work.
The timeline covers design and quotation, manufacturing with FAT testing, transport, on-site assembly, and operator training. A detailed schedule is agreed individually at the quotation stage.
The machine can be configured in a variant compliant with ATEX requirements for zones at risk of organic dust explosions — the required documentation is supplied with the quotation.
The ATEX configuration covers electrical and pneumatic components operating in a biomass dust atmosphere. The precise zone classification scope depends on the customer's installation conditions and is determined at the design stage.
The GRB2 880.264 model is intended primarily for demanding feedstocks in the biofuel and recycling industries, such as woody biomass (sawdust, wood chips), agricultural biomass (straw, hay), recycling waste, sewage sludge and fertilizers.
As standard, the pellet mill is equipped with two main motors rated at 132 kW each, giving a total drive power of about 264 kW (dual drive: 2 × 132 kW). Optionally 2 × 160 kW. IE4-class motors manufactured in Poland by Cantoni Motors.
The throughput for woody biomass (e.g. sawdust from coniferous and deciduous trees) ranges from 2.5 to 3.5 tonnes of pellets per hour, depending on the specific properties and the degree of feedstock preparation.
For agricultural biomass (straw, hay) as well as organic and mineral fertilizers, the machine achieves a stable throughput of 3.5 to 4.0 tonnes per hour.
It uses a Double Direct Drive (DDD – Double Direct Drive) via V-type drive belts, which eliminates the need for gear transmissions and minimizes vibration.
This version operates in a reliable 3-roller system that is optimal for difficult feedstocks, where the standard outer diameter of the roller is 410 mm.
The die has an inner diameter of 880 mm. Depending on the configuration, the working width of the track is 200 mm (working area 53.38 dm²) or 125 mm (working area 33.36 dm²). The linear rotational speed of the die is 5.97 m/s.
The machine works with a dedicated conditioner, model KD5.265, with a diameter of 500 mm and a length of 2650 mm, made entirely of acid-resistant steel. It has a drive rated at 11/15 kW.
The total weight of the machine is 12,880 kg, and its external overall dimensions are 3450 mm in length, 3270 mm in width and 2720 mm in height, respectively.
In a complete process line, it is recommended to use the dedicated ZGP.3 feedstock bin, the 20CP-15 counter-flow cooler and the PZL-6 vibrating pellet sifter.
Nawrocki has been designing and building advanced production lines and complete factories for the feed and pellet industries since 1996, drawing on more than 40 years of experience.
Nawrocki produces exclusively the reinforced ("biomass") version, designed for the most difficult feedstocks (e.g. sawdust from deciduous trees). This means that customers ordering machines for feed production receive equipment with massive mechanical over-dimensioning and extreme durability intended for biomass.
ARGAS is the Automatic Remote Roller Adjustment System (patent P-405199). It enables precise, automatic changing and control of the gap between the rollers and the die from a computer or LCD panel while the pellet mill is running, without stopping production. Recommended for animal feed.
It enables safe recipe changes at full pellet mill load, automatically corrects the gap as the working elements wear, eliminates operator errors and increases real production profits by at least 2% to 4% through time savings.
AIAC (Automintel Automatic Control) is an intelligent control system that analyzes data from the entire pelletizing line up to 200 times per second. It makes executive decisions within 50 ms, which protects the pellet mill against blockage by feedstock and increases annual output by 2–5%.
A low linear speed (approx. 5–6 m/s) extends the pellet forming time in the die holes. This ensures excellent particle densification and the highest pellet quality even with difficult feedstocks such as biomass or feedstocks with variable moisture content.
This is the Rapid Die Change System based on hydraulic centering jaws. It enables the safe removal of a hot die without losing time waiting for it to cool down, reducing pellet mill changeover time to under one hour. Designed for animal feed production.
BTSU is the Single Drive Belt Tensioning Unit. All belts of a single motor are tensioned with one screw, which eliminates assembly errors (uneven tension), extends belt service life and shortens servicing time.
The Automatic Overload By-Pass (AOBP) is mounted on the pellet mill inlet in animal feed production lines. In the event of a sudden spike in motor load, it instantly cuts off the feedstock supply with a pneumatic actuator, protecting the working assembly against blockage.
Vertical and horizontal sterilizers (equipped with the unique NPT Weighing System) guarantee the thermal elimination of pathogens, bacteria and fungi. They improve feed digestibility through higher starch gelatinization and increase pellet mill output by up to 20%.
The design uses 20% larger, electronically balanced pulleys with a high rotating mass and very high torque. This construction perfectly dampens sudden, momentary load spikes and reduces vibration to zero, extending the service life of expensive SKF or FAG bearings.
The dies are made exclusively from high-grade X46Cr13 chromium steel, subjected to advanced vacuum hardening in a nitrogen atmosphere at temperatures above 1000°C.
NPT bins for difficult materials (sawdust, straw, digestate) feature a special flat bottom with a system of multi-screw dischargers working across the entire surface, as well as horizontal agitating shafts (agitators) mounted at various heights.
Yes, all machines, screw conveyors and bins are certified and adapted for operation in dust explosion hazard zones (EX Zones 20, 21 and 22) in accordance with the ATEX 114 and ATEX 153 Directives.
The company has a dedicated project management department (FEED, EPCT) operating strictly according to the American PMI (Project Management Institute) methodology, which guarantees appropriate budget and schedule control as well as transparent risk management.
CALS is the Central Automatic Lubrication System. It consists of a progressive valve and a high-pressure installation made of acid-resistant steel, which automatically delivers precisely measured doses of lubricant to the roller bearings and the main shaft while the pellet mill is running.
A dedicated service inspection should take place every 6 months or every 3000 operating hours (whichever comes first), which effectively eliminates the risk of unexpected downtime.
All production of machines, rollers and dies, as well as the main warehouse for spare and critical parts with round-the-clock 24/7 availability (including weekends), are located in Poland in Żnin (Kuyavian-Pomeranian Voivodeship).
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