2.5 T/H Mixed Biomass Pellet Plant in Chile

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The Project Began With a Feedstock Question

The customer did not begin with a fixed equipment list. The first issue was whether three residue streams with very different bulk density and fibre structure could share the same pellet factory without creating constant feeding and die problems.

The business operates in southern Chile and combines agricultural activity with access to forestry and wood-processing residues. Straw is strongly seasonal and light; clean wood scraps are denser and more regular; bamboo scraps are harder and can raise compression resistance. Using all three offered procurement flexibility, but only if the line could prepare each fraction correctly before blending.

The initial inquiry arrived in November 2018 with a practical capacity target:

“Can one line handle straw, wood waste, and bamboo together? Capacity around 2–3 tons per hour.”

That question led to raw-material testing before the layout was finalized. The engineering team compared moisture, particle form, grinding behaviour and pellet formation instead of assuming one compression setting would work for every blend.

By January 2019, testing had confirmed a workable mixed-fibre route and the biomass pellet project moved forward.
Contract signing followed in February 2019, with installation completed and operation starting in April.

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A 6,000 T/Y Plant on a 10,000 m² Site

The wood pellet processing plant was built as a new project rather than squeezed into an existing workshop. That gave the customer enough room to separate seasonal straw storage, woody residues, the dryer/furnace zone and finished-pellet handling.

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The Blend Changes More Than the Pellet Mill Load

Unlike a conventional wood pellet production plant using uniform sawdust, this mixed biomass pellet plant in Chile has to absorb variation in fibre length, bulk density and seasonal moisture. In search terms, it combines the duties of a straw pellet plant in Chile, a wood waste pellet plant in Chile and a bamboo-processing route without turning them into three separate factories:

• Straw — light and fibrous, with seasonal supply and a higher risk of bridging during feeding
• Bamboo scraps — denser and harder, requiring controlled size reduction before the hammer mill and pellet press
• Clean wood scraps — the most stable woody fraction and an important base for pellet formation

The equipment sequence therefore separates coarse preparation from fine grinding. Straw is kept short enough to meter consistently, while large wood and bamboo pieces first pass through the chipper. Only after the different materials reach a compatible particle range are they blended for drying and pelleting.

Trial batches showed why this matters. Loose pellets were linked to unstable moisture and fibre distribution, while overly hard batches appeared when the woody fraction and compression load were too high. The final operating practice uses blend control, moisture measurement and die-load monitoring together rather than trying to solve every quality issue by increasing compression.

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7,200 Tons of Biomass Provide the Annual Supply Margin

Southern Chile gives the project access to both agricultural and forestry residues. This wood pellet plant construction project uses that diversity as a supply strategy: straw covers the largest annual share, wood residues add a stable lignocellulosic base, and contracted bamboo scraps provide an additional harder fibre stream.

The annual procurement basis is larger than the 6,000 T/Y finished-pellet target because drying removes water and screening removes unsuitable contaminants or oversize material. The plant does not assume that 7,200 tons of as-received biomass becomes 7,200 tons of saleable pellets. Storage planning is also different by material: straw needs more cubic volume per ton and arrives seasonally, wood scraps can turn over more evenly, and bamboo is kept separate until its moisture and size are checked. That prevents one inexpensive but difficult batch from changing the feed behavior of the entire warehouse.

Annual Raw Material and Utility Basis

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The Product Is Industrial Fuel Not a Wood-Only Premium Pellet

The mixed biomass pellet plant in Chile produces a utility-grade fuel pellet rather than a wood-only premium heating pellet. Because straw and bamboo are part of the formula, ash and mineral behaviour differ from pure sawdust products. The finished fuel is therefore positioned for users whose combustion systems can accept mixed-biomass specifications:

• Industrial boilers with fuel-handling systems suitable for mixed biomass pellets
• Small and medium heating systems designed for the actual ash specification of the product
• Biomass energy plants able to manage the stated moisture, ash and calorific-value range

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One MZLH678 Sets the 2.5 T/H Pellet Capacity

The wood pellet processing equipment is deliberately compact, but every major stage is included. Coarse wood and bamboo are chipped, mixed material is hammer-milled, wetter batches can enter the dryer, and finished pellets are cooled and screened before packing.

Main Equipment and Final Configuration

The wood granulator machine is configured as an MZLH678 because its 2.5–3.0 T/H biomass range covers the 2.5 T/H annual design target with modest operating margin. Bamboo-rich batches can increase compression resistance, so operators monitor feed rate and die load instead of assuming every blend will achieve the same instantaneous throughput.

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The Layout Keeps the Hot Section Away From Offices

The customer had a 10,000 m² site and about 6,400 m² of building area, which allowed the project to remain mostly horizontal. The main layout problem was not space shortage but keeping truck unloading, drying and finished-pellet movement from crossing each other unnecessarily. Seasonal straw deliveries can arrive in concentrated periods, so the raw-material side needs temporary overflow room and fire-safe separation from the dryer/furnace area. Finished pellets, by contrast, need a dry route from cooler to packing and warehouse without loaders carrying loose straw through the same aisle.

The final zoning follows a simple east-to-west operating logic:

• East side: office, parking and low-dust staff access
• Center: production workshop, cooling, packing and finished-product storage
• West side: raw-material yard, dryer/furnace section and incoming truck activity

This arrangement shortens conveying while keeping the thermal section and raw-material dust away from office circulation. It also leaves enough maneuvering room for seasonal straw deliveries, which can occupy far more volume per ton than wood scraps.

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Material Preparation Changes Before the Shared Pellet Stage

The wood pellet production line in Chile uses one shared route only after the different feedstocks have been brought into a compatible size and moisture range. That is the practical difference between this agricultural waste pellet plant in Chile and a single-material sawdust line:

1. Coarse Wood and Bamboo Preparation

• Large clean wood and bamboo scraps enter the chipper before fine grinding
• Typical chip size is reduced toward approximately 20 mm before the hammer mill
• Local extraction and housekeeping control coarse dust around the feeding point

2. Fine Grinding and Blend Preparation

• Prepared woody material and suitably cut straw enter the hammer mill according to the active blend
• Magnetic protection removes ferrous contamination before high-speed grinding
• Bag filtration captures fine dust; pellet-feed particle size is generally controlled around 3–5 mm

3. Conditional Drying

• The rotary dryer is used only when blended material is above the pelleting moisture window
• A biomass-fired rotary drum supplies controlled hot air without forcing already-dry material through full thermal duty
• Cyclone separation and the 15 m exhaust stack handle dryer air before discharge

4. Pelleting Cooling and Screening

• Prepared fibre enters the wood pellet press at a controlled feed rate
• Compression heat develops through die friction; operating temperature is monitored instead of fixed at one nominal value
• No routine chemical binder is added when moisture, particle size and the woody fraction are within the working range
• Natural lignin from the woody components supports binding, after which pellets are cooled and fines are screened before storage

5. Packing and Finished Product Storage

• Cooled and screened pellets move to the automatic packing station according to customer bag-size requirements
• Finished product is divided between two warehouse zones so new production can be separated from dispatch-ready stock

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Dust Fire and Dryer Exhaust Define the Environmental Plan

The environmental system is sized around the real emission sources: dry dust from chipping, grinding and transfer; hot exhaust from the biomass dryer; domestic wastewater from staff areas; and mechanical noise from the chipper, hammer mill and pellet press.

• Dust → three bag-filter collectors plus cyclone pre-separation at suitable process points
• Wastewater → domestic and cleaning water managed through the site sanitation system; no process-water discharge from pelleting
• Drying → cyclone treatment, controlled biomass-furnace operation and dedicated exhaust stack
• Noise → equipment foundations, enclosure and maintenance access used to control vibration and boundary noise

Fire prevention is also part of housekeeping. Straw dust and dry wood fines are not allowed to accumulate around motors, hot bearings or the furnace area, and finished pellets are cooled before they enter enclosed storage.

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From Material Tests to Operation in Five Months

The installation schedule was short because the project used a single pellet press and a relatively direct material route. Most startup time was spent on blend feeding, dryer settings and die-load adjustment rather than on complex civil construction.

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Commissioning Focused on Moisture and Straw Feeding

Mixed biomass did not stabilize on the first batch. The startup team had to separate material problems from machine problems before fixing the final operating window.

• Moisture varied between straw-rich and woody batches, changing pellet hardness and press load
• Light straw required feeding adjustments so it did not bridge or arrive at the hammer mill in uneven slugs
• Dryer temperature and residence time needed different settings when the woody fraction or incoming moisture changed

The commissioning result was a simple operating rule:

“Stabilize moisture and feed rate before changing the die setting.”

That rule is especially useful for mixed-material fuel pellet plants because a change in raw-material ratio can look like a mechanical problem if the operator reacts only to motor load.

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Qingdao to San Antonio for Inland Delivery to Southern Chile

• Departure port: Qingdao Port, China
• Destination port: Port of San Antonio, Chile, followed by inland transport to the project site

All wood pellet manufacturing equipment was containerized and packed according to the installation sequence. The compact equipment count reduced project-cargo complexity, but the dryer drum and pellet-mill components still required moisture protection during ocean transport.

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US$260,000 Fixed Investment for a New-Build Mixed Biomass Plant

The project’s completed fixed investment is approximately US$260,000, of which about US$180,000 is the equipment package. The balance covers foundations, workshop interfaces, electrical distribution, dryer/furnace installation, freight, inland delivery, commissioning and other new-build site work.

Feedstock diversity is part of the commercial case. Straw, wood residues and bamboo scraps do not have the same seasonal availability, so the customer can reduce dependence on any single supply stream while keeping the fuel specification within the plant’s agreed operating window.

A 2.5 T/H wood pellet making line in Chile can be practical for a regional producer when three conditions are controlled:

• Raw-material contracts cover both seasonal straw and year-round woody residues
• Finished fuel is matched to boilers that can accept mixed-biomass ash characteristics
• The 6,000 T/Y sales plan is built around regional industrial and heating users rather than an assumed export premium

The return depends on residue cost, drying duty, electricity and the local fuel contract. The page therefore presents the completed investment and process basis without promising a fixed payback period. Mixed-biomass economics can change even when the headline feedstock price looks low: a wetter straw batch consumes more drying energy, a harder bamboo fraction can reduce instantaneous press throughput, and a high-ash blend may only suit a narrower group of boilers. The customer therefore evaluates raw material by usable pellet value, not by purchase price alone.

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Mixed Biomass Projects Should Start With the Hardest Material

This 2.5 T/H straw, bamboo and wood pellet manufacturing plant in Chile is a medium-scale regional fuel project, not a large export complex. Its value comes from matching three real feedstocks to one manageable production system:

• A fixed investment that remains proportionate to 6,000 T/Y of finished product
• Raw-material flexibility without pretending straw, bamboo and wood behave identically
• One MZLH678 pellet section supported by the drying, cooling and dust-control equipment it actually needs

The hardest or most variable feedstock should set the preparation standard. In this case, bamboo resistance, straw feeding and seasonal moisture were addressed before the final pellet-mill operating window was fixed.

That leads to a better first question for a mixed biomass project:

“Which material is most likely to interrupt stable production?”

Answering that question early helps determine whether the project needs more storage, better chopping, a dryer, a stronger press or simply tighter supplier specifications.

For an agricultural waste or bamboo pellet plant in Chile, send the annual tonnage, moisture range and incoming size of each feedstock separately. The blend ratio, dryer duty and MZLH model can then be selected from the real material balance rather than from a generic 2–3 T/H package.