Rice Husk Sawdust and Reed Biomass Pellet Plant in Greece

RICHI MACHINERY

The Project Was Designed around Three Raw-Material Behaviors

The main engineering challenge is not annual tonnage. It is preparing three very different materials so that the pelletizing section receives a stable feed.

The plant therefore has separate receiving and preparation logic upstream, followed by one controlled blending and pelletizing system downstream. That is more reliable than forcing all biomass through one crusher and hoping the biomass pellet making machine compensates for the variation.

RICHI MACHINERY

Greece Provides a Credible Base for the Material Combination

The customer is positioned close enough to agricultural and wood-processing suppliers to build a multi-source biomass network without depending on one seasonal residue. Greece produced about 221,700 tons of rice in 2024, and commercial rice milling is concentrated strongly enough in northern Greece to make rice husk a credible contracted residue stream. That national figure is used only to confirm the existence of a real milling base; the project itself counts only husk volumes secured from specific suppliers after competing uses, transport distance and delivered moisture are checked.

• Rice husk comes from rice milling.
• Sawdust and other accepted clean fine wood residues come from sawmills, furniture-production workshops and wood-processing operations with documented legal origin and traceable supply.
• Reed is treated differently.

The project does not assume that a pellet company can freely harvest natural wetland vegetation wherever it finds it. For this project, reed supply is treated as an approved procurement stream rather than an unrestricted wild-harvesting resource; suppliers need to provide material from legally permitted vegetation-management, drainage-management or other authorized harvesting activities, with protected habitats and restricted areas excluded unless the competent authority has specifically approved the work. That sourcing distinction matters because the fuel project cannot treat the availability of reed as permission to harvest vegetation without the relevant land-use and environmental controls.

The biomass pellet plant therefore treats reed as a documented purchased feedstock and keeps biomass procurement separate from any environmental authorization required for the vegetation-management activity itself.

RICHI MACHINERY

The Customer Does Not Lock Production into One Permanent Formula

A fixed annual recipe such as “60% rice husk + 30% sawdust + 10% reed” would sound precise but would not represent how a commercial mixed-biomass plant actually operates. The ratio changes according to four factors: availability, moisture, ash specification and buyer fuel requirements.

• Clean sawdust generally helps reduce the ash level of a rice-husk-rich product.
• Rice husk contributes a stable milling-industry residue stream but increases mineral and silica content.
• Reed can diversify supply but requires separate preparation and careful ash evaluation.

The customer therefore develops several approved production recipes instead of one universal mixture. Typical commercial campaigns may be:

• sawdust-dominant industrial pellets;
• sawdust + rice husk blended pellets;
• sawdust + prepared reed pellets;
• three-material blends for approved industrial users.

Every new blend is tested before it becomes a routine commercial SKU.

RICHI MACHINERY

Why the Plant Does Not Produce a “Universal Biomass Pellet”

The finished product is sold according to its actual feedstock composition. A pellet made predominantly from clean wood residues is not assumed to have the same ash behavior as one containing substantial rice husk or reed. This affects the end user.

Industrial fuel customers need to know:

• moisture;
• ash;
• pellet diameter;
• bulk density;
• fines;
• calorific value;
• fuel composition;
• combustion compatibility.

The customer therefore avoids selling mixed agricultural-residue pellets as if they were ordinary premium household wood pellets. The commercial target is industrial or agricultural heat users whose combustion equipment can accept the declared agricultural-biomass ash profile. Mixed pellets are not presented as ENplus-style premium residential wood pellets unless a separately tested product genuinely meets the relevant specification.

RICHI MACHINERY

Rice Husk Takes the Shortest Preparation Route

Rice husk is already relatively small when it leaves the rice mill. If it is clean and dry, there is little value in passing the entire stream through a large hammer mill. The standard rice husk route is: receiving → impurity screening → magnetic protection → moisture check → buffer bin. From the buffer bin, the material proceeds to the blending section.

Avoiding unnecessary grinding reduces:

• electricity consumption;
• dust generation;
• wear;
• equipment investment;
• transfer losses.

If a particular batch contains compacted lumps or oversized contamination, these are handled separately rather than making grinding compulsory for every ton.

RICHI MACHINERY

Sawdust Is Screened before the Plant Decides Whether to Grind It

Sawdust suppliers do not all deliver the same material. Fine sanding dust, sawmill sawdust and mixed wood-processing residues can have very different particle distributions. This biomass pellet project accepts only suitable clean untreated wood-derived material. Painted timber residues, chemically treated wood, MDF dust containing unsuitable adhesive systems and contaminated demolition wood are not automatically included in the normal fuel recipe.

Fine sawdust can bypass secondary grinding after screening and metal removal. Coarser material is directed to the hammer mill. This means the hammer mill operates when it creates value rather than simply because one appears on a standard pellet-line diagram.

RICHI MACHINERY

Reed Needs the Most Preparation

Reed is the material that changes the upstream equipment architecture. It may arrive as cut stalks, chopped loose material or compacted bales depending on the supplier. Long fibrous stalks cannot feed uniformly into an MZLH pellet mill. A typical reed route is therefore: receiving → bale opening when required → coarse cutting/shredding → hammer milling → prepared-fiber storage. The purpose of the first size-reduction stage is not to create final powder. It makes the reed manageable for the hammer mill. The hammer mill then creates a more controlled particle distribution that can be blended with sawdust and rice husk.

Trying to make one hammer mill accept whole reed bales directly would create unstable feeding and unnecessarily high load.

RICHI MACHINERY

Three Feedstocks Need Separate Moisture Control

The original materials may arrive at very different moisture levels even on the same day.

• Clean stored rice husk may be relatively dry.
• Kiln-related sawdust can also be dry.
• Outdoor sawmill residues may be much wetter.

Winter-harvested reed may still carry more moisture than the pelletizing section can accept.

Moisture is therefore checked by feedstock before blending, so a wet sawdust or reed batch can be handled without forcing already-dry rice husk through the same conditioning route. A practical pelletizing preparation target is generally around the low-teens moisture range, with the final operating window established from the actual material blend and MZLH performance. The plant does not claim that one exact number works for every mixture.

RICHI MACHINERY

A Dryer Is a Conditional Module, Not a Permanent Energy Load

This project illustrates why mixed-biomass plants need more flexible engineering than single-material lines. If sawdust, rice husk and prepared reed all arrive within the usable moisture range, there is no reason to consume thermal energy drying them again. The dryer can remain bypassed. When a wetter sawdust or reed campaign enters production, the affected stream is routed through drying before final grinding or blending.

This creates two operating modes:

• Dry-feed mode: screening/preparation → blending → pelletizing
• Wet-feed mode: preparation → drying → final size control → blending → pelletizing

The customer therefore does not pay the thermal-energy penalty on every ton simply because some seasonal material sometimes needs drying.

RICHI MACHINERY

Thermal-Energy Selection Follows the Actual Greek Site

The biomass pellet production line project does not assume natural gas is available simply because the plant is in Europe.

A coal-fired dryer is not treated as the default thermal solution for the project.

If regular drying proves necessary, the thermal system is selected from locally available and permitted energy options. For a biomass factory, one practical option can be a properly controlled biomass-fired hot-air system using an approved clean biomass fuel stream. But that is not automatically the cheapest solution.

RICHI also evaluates:

• electricity price;
• locally available biomass fuel;
• required thermal load;
• operating hours;
• emissions-control cost;
• fuel storage;
• ash management;
• local permitting.

If the biomass fuel pellet plant only dries occasionally, installing an oversized thermal system can be less economical than redesigning raw-material procurement around drier suppliers.

RICHI MACHINERY

The Process Combines Only after Each Material Is Ready

Once the three raw-material families have reached acceptable particle size and moisture, they enter controlled buffer bins. From this point, the line changes from material-specific preparation to recipe-controlled production.

The complete process is:

1. Raw-material receiving and inspection
   Sawdust, rice husk and reed are received separately and checked for moisture, contamination and physical condition.
2. Material-specific preparation
   Rice husk is screened; sawdust is screened and ground only when needed; reed is opened, cut and hammer-milled.
3. Drying when required
   Only wet streams are routed through the drying module.
4. Prepared-material buffering
   Each feedstock remains in a separate bin or silo before blending.
5. Controlled proportioning
   Feeders meter the required amount of each material according to the production recipe.
6. Mixing
   A mixer reduces short-term variation before pelletizing.
7. MZLH pelletizing
   The blended biomass enters three MZLH768 ring die pellet machines.
8. Cooling
   Hot pellets enter a counterflow cooler.
9. Screening
   Loose fines and broken pellets are separated.
10. Fines recycling and dispatch
    Suitable clean fines return to the process; finished pellets move to bulk, FIBC or industrial bagging.

The mixing step is important. Without it, a plant switching from rice-husk-rich flow to sawdust-rich flow could send rapid composition changes directly into the ring dies.

RICHI MACHINERY

Why Mixing Is More Important Here Than in a Sawdust-Only Plant

A homogeneous sawdust stream from one mill may not need aggressive blending. This plant does.

Bulk density, friction, ash content and fiber structure can change as the proportion of rice husk, sawdust and reed changes. Stable mixing gives the rice husk sawdust pellet mills a more predictable material.

That helps operators manage:

• feeder speed;
• motor load;
• die temperature;
• compression;
• throughput;
• pellet durability;
• fines.

It also makes finished fuel analysis more meaningful because a commercial batch represents an intentional recipe rather than random material layering in a hopper.

RICHI MACHINERY

Three MZLH768 Units Create a Flexible 10–12 T/H Pelletizing Section

The project uses three RICHI MZLH768 biomass pellet presses.

The three-machine arrangement is valuable because raw-material and order volumes are not constant. During a smaller production campaign, two machines may be sufficient. All three can operate when prepared feedstock and customer orders justify the upper end of the practical project range. Actual throughput still changes with moisture, blend composition, die specification, bulk density and feeding stability. Scheduled die or roller work on one machine therefore does not automatically stop the whole plant.

RICHI MACHINERY

Different Raw Materials Need Different Ring-Die Decisions

Using three identical machine models does not mean every production campaign uses identical die conditions forever.

• Rice husk has a more abrasive mineral profile.
• Sawdust has different natural binding and friction characteristics.
• Reed introduces another fiber structure.

RICHI therefore evaluates compression ratio and operating settings against the actual commercial recipes.

A die that performs well on a sawdust-heavy product may create excessive power demand on another mixture. Conversely, reducing compression too far can increase fines. Commissioning therefore looks at pellet quality and motor load together.

RICHI MACHINERY

Wear Is Managed as a Feedstock Cost

Rice husk and mineral contamination can increase wear. For that reason, the plant pays close attention to magnetic separation and keeping soil, sand and stones out of the biomass.

Wear inspection focuses on:

• ring dies;
• roller shells;
• hammer-mill screens;
• hammers;
• shredder/cutter components;
• feeder contact surfaces;
• conveying bends.

Maintenance decisions are not based on calendar hours alone. Changes in motor current, throughput and fines can indicate a material or wear problem before failure occurs.

RICHI MACHINERY

8mm Is the Standard Industrial Product

The plant begins with an 8 mm pellet. That simplifies inventory of ring dies and reduces unnecessary changeovers during early commercial operation. The customer can evaluate 6 mm or other specifications later if a real buyer requires them. But different pellet diameters are not added simply to make the product catalog longer.

The 8 mm fuel is intended primarily for commercial thermal systems where handling stability and predictable feeding are more important than retail appearance.

RICHI MACHINERY

Mixed Pellets Require Combustion Trials

For a new industrial buyer, a representative fuel sample and combustion trial provide more useful qualification evidence than a brochure alone. A new industrial buyer can test:

• ash;
• moisture;
• calorific value;
• bulk density;
• mechanical durability;
• fines;
• chlorine and other relevant parameters;
• slagging/ash behavior in the actual combustion system.

The composition of a mixed pellet must be disclosed and controlled. That prevents a rice-husk-rich product from being sold to a boiler designed only for low-ash clean wood fuel.

RICHI MACHINERY

Cooling and Screening Are Sized for the Full Pellet Section

All three MZLH768 units discharge into a coordinated downstream system. The cooler therefore has to handle the realistic combined output. Fresh pellets are warm and mechanically more vulnerable immediately after formation.

Counterflow cooling lowers the temperature and allows the pellet structure to stabilize. After cooling, the screen removes fines. Clean reusable fines return upstream at a controlled rate.

A rising recycle load is treated as a process warning rather than hidden inside the material balance.

RICHI MACHINERY

Finished Product Is Primarily an Industrial Fuel

The plant is not designed around small residential bags. Typical dispatch options include:

• bulk truck loading;
• FIBC/big bags;
• larger industrial bags.

The customer chooses packaging according to boiler-site infrastructure and transport distance. This reduces packaging cost for customers consuming several tons per day.

Retail bags remain technically possible, but they are not used to justify the plant economics.

RICHI MACHINERY

Low-Density Raw Materials Drive the Site Size

Thirty thousand tons per year does not sound particularly large, but loose rice husk and reed occupy considerable volume.

Raw-material warehousing therefore requires more space than the pellet mills themselves.

The site also needs enough separation to keep wet incoming biomass from contaminating prepared dry material.

RICHI MACHINERY

Electricity Is Recalculated around Three 250 kW Pellet Mills

The three MZLH768 biomass granulators alone provide 750 kW of installed main-motor capacity. Other electrical loads include:

• bale breaker/reed opener;
• coarse cutter/shredder;
• hammer mill;
• material feeders;
• mixer;
• conveyors/elevators;
• cooler;
• screens;
• aspiration;
• packing;
• optional dryer fans;
• compressed air.

A realistic annual planning range is approximately 2.2–3.0 million kWh/year.

The lower end is more achievable when dry rice husk and fine sawdust form a high share of production. Power consumption increases when more reed or coarse wood material requires intensive preprocessing.

RICHI MACHINERY

Transformer Planning Must Include Production Flexibility

The plant does not calculate transformer capacity from annual kWh. The electrical design considers which high-power machines can operate simultaneously.

With three 250 kW biomass fuel pellet machines plus preparation and downstream equipment, a preliminary electrical service in the region of approximately 1.25–1.6 MVA is appropriate for detailed evaluation.

The final rating depends on:

• confirmed crusher/hammer-mill motors;
• dryer configuration;
• simultaneous line operation;
• starting method;
• local grid conditions;
• expansion reserve.

Large motors can use suitable soft-start or frequency-control arrangements where technically justified.

RICHI MACHINERY

Greece’s Climate Requires Both Dry-Season and Wet-Season Planning

A Greek biomass plant cannot be described simply as “hot” or “Mediterranean” and then given one climate assumption.

Summer conditions can favor dry outdoor logistics for selected residues. Wet winter periods can create a very different storage problem.

Reed harvesting is also seasonal. For that reason, the plant relies on covered storage for prepared feedstock and keeps rainwater away from dry production areas.

It does not install space heating as a major production utility.

Control rooms and occupied office areas use appropriate local heating/cooling as required, while production halls focus on ventilation, dust extraction and weather protection.

RICHI MACHINERY

Equipment Configuration Reflects Three Preparation Routes

The complete plant uses common equipment only where common equipment makes sense.

The configuration is not three duplicated pellet plants; it uses material-specific preparation only where necessary, then brings prepared feedstocks into one coordinated proportioning, mixing, pelletizing and finishing platform.

RICHI MACHINERY

The Plant Needs More Than Ten Employees

A mixed-feedstock project requires greater material control than a small single-residue pellet workshop.

Approximately 18–24 employees is a more realistic planning range.

The team covers:

• production management;
• receiving and QC;
• loaders;
• reed preparation;
• grinding/drying;
• pelletizing;
• cooling and packing;
• warehouse/dispatch;
• electrical/mechanical maintenance;
• environmental/safety responsibilities.

If part of the site is integrated with an existing rice mill or wood-processing company, some QC, administrative and maintenance positions can be shared.

RICHI MACHINERY

Commissioning Starts with Three Separate Materials

The plant is not commissioned immediately on a complicated three-material blend.

RICHI first establishes a production baseline for each feedstock family.

• Sawdust is tested to understand feeding, die load and pellet durability.
• Rice husk is then tested with particular attention to wear, ash-related product positioning and motor load.
• Prepared reed is tested for feeding stability, fiber size and compression behavior.

Only after these baselines exist are controlled blends introduced. This lets engineers identify whether a problem comes from: one material, the preparation system, the blend ratio or the pelletizer setting.

That is much more useful than adjusting several variables at once.

RICHI MACHINERY

The Customer Can Change Raw-Material Strategy without Rebuilding the Plant

The value of this pellet plant project becomes clearer when one raw-material market changes.

• If sawdust becomes expensive, the customer can evaluate a higher proportion of approved agricultural residues.
• If rice-mill supply is temporarily strong, more husk can be processed within the quality limits of the customer’s fuel contracts.
• If reed supply is interrupted by seasonal or environmental restrictions, the plant does not depend on reed to remain operational.

That flexibility is why the customer invests in separate preparation and proportioning rather than one fixed raw-material route.

RICHI MACHINERY

Expansion Should Target the Real Bottleneck

Three MZLH768 sawdust rice husk pellet mills already provide meaningful pelletizing capacity.

If orders grow, the next investment is not automatically a fourth pellet mill.

The bottleneck may be:

• reed preparation;
• hammer milling;
• drying;
• prepared-material storage;
• cooling;
• screening;
• finished-product warehouse;
• transformer capacity;
• raw-material contracts.

RICHI therefore uses real operating data before recommending Phase II. For a mixed-biomass plant, raw-material logistics can become the constraint long before ring-die capacity.

RICHI MACHINERY

Water Use and Equipment Logistics Stay Simple

This is fundamentally a dry biomass plant. Process water is not a major continuous utility because the project does not use steam conditioning or wet washing as standard production steps. Water demand is mainly for staff facilities, housekeeping and limited maintenance cleaning; a practical routine planning range is approximately 300–600 m³/year for these uses, while the fire-water system is sized separately according to the final building and fire-safety design.

For a northern Greek project, the main RICHI equipment can be shipped from Qingdao to the Port of Thessaloniki, then moved by road to site. Thessaloniki has an established container terminal and is a practical gateway for machinery serving northern Greece. Large locally fabricable items such as selected platforms, supports, buildings and civil works can be sourced or constructed locally from confirmed RICHI interface drawings.

Export packing separates the three MZLH768 units, reed-preparation equipment, hammer-mill components, cooler, screens, control cabinets and auxiliary systems by installation package so the customer can identify each part after arrival instead of receiving an undifferentiated equipment shipment.

RICHI MACHINERY

RICHI Supply Investment Reflects the Multi-Material Preparation Scope

For the separate rice husk, sawdust and reed receiving routes, reed opening and size reduction, grinding, bypassable drying interface, proportioning, mixing, three MZLH768 pellet mills, cooling, screening, dust control, industrial packing and automation described here, the RICHI machinery and core engineering supply value is approximately: USD 730,000

The final price depends especially on:

• reed receiving form;
• amount of coarse preprocessing;
• dryer capacity;
• thermal system;
• raw-material storage;
• number of hammer mills;
• dust/explosion-protection scope;
• automation;
• local steel fabrication;
• packing method.

Land, major civil works, local utility connection and customer-side permits belong to the wider plant investment unless specifically included in the supply contract.

RICHI MACHINERY

Why This Greek Plant Is a True Multi-Raw-Material Project

The strength of this 30,000 T/A rice husk sawdust and reed biomass pellet plant in Greece is not that three materials appear in a raw-material list.

Each material changes a different part of the engineering route.

• Rice husk can bypass grinding.
• Fine sawdust can also bypass unnecessary size reduction.
• Reed cannot.

Material above the acceptable pelletizing moisture window can be routed through drying.

Material already within the usable moisture range bypasses unnecessary drying.

Each material remains separated until particle size and moisture are controlled. Only then does proportioning and mixing create a stable pellet-mill feed.

The plant also accepts that a mixed agricultural pellet cannot be marketed blindly as premium wood fuel. Buyers must be matched to ash, combustion and emissions characteristics.

For another biomass-fuel producer, rice processor, wood-processing company or renewable-energy investor considering a similar plant, RICHI therefore needs more than total annual tonnage.

The engineering team needs to know how many tons of each biomass are actually controlled, seasonal moisture, particle form, whether reed arrives baled, raw-material storage days, intended blend ratios, finished-fuel ash limits, buyer boiler type, local electrical supply, available drying fuel, land area and expected production campaigns.

Those answers determine whether a multi-feedstock plant creates useful sourcing flexibility—or simply introduces unnecessary process variation.