2–3 T/H Biomass Pellet Plant in Cambodia

RICHI MACHINERY

A Retrofit Project Rather Than a Greenfield Factory

The customer already traded agricultural by-products in Kampong Speu and had experience moving rice husk into local fuel markets. The existing pellet site therefore offered something more valuable than used machinery: it already sat inside a biomass-supply network. The customer reused what still had value without treating the inherited equipment as a complete solution.

The 4,000 m² site includes a 600 m² production building, about 300 m² of finished-product space, roughly 500 m² for raw-material storage and around 1,000 m² of semi-finished buffer storage. That footprint was enough to separate receiving, preparation, pelleting and finished goods without a new factory shell.

The takeover assessment identified five practical weaknesses that had to be resolved before output could be increased:

• Dust from crushing and pelleting was not captured at the main release points.
• Pellets left the press hot and had no controlled cooling stage before handling.
• The finished-product screen was unreliable, so fines and oversized material were not consistently separated.
• Raw-material and finished-product traffic crossed inside the workshop, increasing handling time and housekeeping load.
• The installed equipment did not provide enough sustained capacity for a 12,000 T/Y two-shift production target.

The customer acquired the usable operating assets and site access for about US$25,000, then budgeted the modernization separately.

The target was clear: convert the existing property into a reliable 2–3 T/H biomass pellet plant in Cambodia without spending greenfield-factory money. The total project funding envelope was about US$300,000, including startup working capital. The completed fixed-investment portion is treated at about US$260,000.

The roughly 14-month rebuild covered building changes, dust control, added machines, conveying routes and commissioning in a coordinated sequence.

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Four Engineering Priorities Defined the Rebuild

Priority 1 – Capture dust where it is generated.
The crushing and pelleting areas handle dry fibrous material, so housekeeping alone is not enough. The retrofit added source capture at the main dust points instead of relying on open-door ventilation.

Engineering response: A DMC-240 baghouse system with two main capture points, approximately 16,000 m³/h total airflow and a 15 m exhaust stack was integrated around crushing and pellet handling. The objective is not only cleaner air; captured fine material can be returned to the process when product quality permits.

Priority 2 – Cool pellets before storage.
Fresh biomass pellets leave the die hot and mechanically vulnerable. Packing or stacking them before adequate cooling increases breakage, condensation and storage risk, especially in a warm Cambodian climate.

Engineering response: A counterflow cooler was added downstream of the common pellet conveyor. Pellets remain in the cooling section long enough to reduce temperature before screening and bagging. Finished product is released only after temperature and surface condition are stable.

Priority 3 – Close the annual capacity mathematically.
The inherited wood pellet production line could not support the customer’s two-shift 12,000 T/Y target. At 300 days and 16 scheduled hours per day, the factory must average approximately 2.5 T/H.

Engineering response: The pellet section now uses four MZLH420 wood pellet mills. Each machine has a 90 kW main motor and a biomass capacity of about 1.0–1.2 T/H. Three units can share normal production at partial load while the fourth provides maintenance and die-change redundancy. The overall line is still rated at 2–3 T/H because the common grinding, blending, cooling, screening and handling sections define sustained factory throughput.

Priority 4 – Make material move in one direction.
The site already had enough space, but poor zoning created unnecessary loader travel and cross-traffic. The retrofit therefore treated layout as a process problem, not simply as a civil-work issue.

Engineering response: Raw materials enter from the north-side storage and preparation area, move through size reduction and blending, pass into the pellet section, and finish in the southern packing and storage zone. The result is a straighter route with fewer backtracking movements and clearer separation between incoming residues and finished fuel.

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Cambodia Feedstock Mix Built Around Rice and Wood Residues

The project deliberately avoids dependence on one residue stream. Cambodia has a large rice sector, making rice husk and rice straw practical inputs for a rice husk pellet plant in Cambodia when ash and blend ratio are controlled. Wood sawdust supports the sawdust pellet plant in Cambodia route, while clean solid-wood offcuts give the wood waste pellet plant in Cambodia a second woody feedstock. The operating advantage is supply flexibility, but only if each material is controlled by moisture, ash contribution, particle size and contamination risk.

Rice husk is not treated as a drop-in replacement for wood. Its mineral content raises ash, so the recipe is adjusted by customer specification rather than fixed to one percentage for every batch. Rice straw adds fiber and grinding load. Sawdust and clean wood offcuts improve the woody fraction, but all recycled wood must remain untreated because composite boards, coatings and chemical preservatives are not suitable substitutes for clean biomass fuel feedstock.

The line has no thermal dryer. Covered storage, receiving checks and blend control keep feed moisture within the pelleting window. Wetter straw is held back or combined with drier material rather than forced through the presses. The 12,000-ton table is a normalized procurement basis; actual mass varies with moisture loss, dust recovery and fines recycle.

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A Retrofit Equipment Package With Built-In Redundancy

New and upgraded equipment package: about US$141,000. This figure covers the added grinding capacity, three new pellet mills, conveyors, central baghouse, cooler, capture hoods and supporting equipment. It is an equipment-package figure, not the completed fixed investment for the whole retrofit.

The wood pellet press section uses four MZLH420 machines, giving roughly 4–5 T/H of aggregate nameplate capacity. The factory remains a 2–3 T/H system because mixed feedstock, shared preparation, common cooling and maintenance windows determine sustained output. One press can therefore be taken offline without stopping production.

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Process Logic Changes With the Feedstock

The Cambodia biomass pellet production line does not use one fixed mechanical setting for sawdust, rice husk, rice straw and solid-wood offcuts. The route is common, but the intensity of crushing, grinding and blending changes with the material entering the plant.

Step 1 – Receive and separate.
Trucks unload sawdust, rice husk, rice straw and clean wood residues into designated areas. Moisture and contamination are checked before material is released to production, and all storage remains under cover to avoid rain-driven moisture increases.

Step 2 – Crush clean solid-wood residues.
Offcuts and larger wood pieces are reduced before hammer milling. MDF, plywood, painted wood and chemically treated boards are excluded rather than diluted into the blend.

Step 3 – Grind by material behavior.
Two grinding machines provide more flexibility than one common setting. Rice husk requires less aggressive size reduction than straw, while fibrous rice straw needs enough milling to prevent long fibers from bridging feeders or creating unstable pellet-mill load.

Step 4 – Build the batch.
Material is blended according to available supply and finished-pellet requirements. The operator uses the wood fraction to control pellet formation and adjusts the agricultural-residue share with ash, moisture and customer boiler limits in mind. The existing project relies on loader-assisted blending rather than a high-cost fully automated formulation system.

Step 5 – Pellet with three duty machines and one reserve.
The wood granulator machine section is based on four MZLH420 units. Normal production is shared across three presses at controlled load, while the fourth gives the maintenance team room for die change, roller work or temporary feedstock-specific setup. Finished industrial fuel pellets are produced mainly at 8 mm.

Step 6 – Cool before the product moves further.
Pellets from the operating presses enter a common counterflow cooler. The cooler removes retained heat and stabilizes the product before screening, reducing the risk of condensation and breakage in bags or bulk storage.

Step 7 – Screen, recycle fines and dispatch.
The screen removes loose fines before sale. Suitable fines are returned to production. Finished pellets can be packed in 25 kg bags or dispatched in bulk for industrial boiler users, allowing the same plant to serve smaller repeat customers and larger fuel buyers.

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Dust Control Became a Production System Not an Add-On

The central baghouse was one of the most important retrofit items because the project handles several dry, low-density materials. Rice husk fines, ground straw and sawdust behave differently, but all can escape at crushing, transfer and pellet-handling points if capture is weak.

The dust-control budget is about US$21,000 within the retrofit package. Its value is in worker conditions, housekeeping, fire-risk reduction, neighbor impact and recovery of suitable fine material instead of allowing dust to accumulate around motors and bearings.

The completed system includes:

• Two main capture hoods serving high-dust crushing and pellet-handling points
• One DMC-240 baghouse filter with 240 filter bags
• One 15 m exhaust stack for the centralized extraction system
• Approximately 16,000 m³/h total design airflow
• Collected fines routed for controlled recycle where material quality allows

Filter differential pressure, bag condition, duct cleanliness and settled dust are included in routine maintenance. Recovered fines are not automatically recycled if they contain contamination from housekeeping or non-process areas.

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What the Two-Shift Factory Needs to Operate

The wood pellet manufacturing plant is organized for two-shift operation rather than for short peak-capacity runs. With four 90 kW pellet mills installed, two grinding machines, dust extraction, cooling and conveying, the project requires an electrical service sized for simultaneous grinding, pelletizing, dust extraction, cooling and conveying. The completed operating basis is planned around the following utilities and staffing.

Capacity closure:

The line therefore closes mathematically without relying on unrealistic monthly profit assumptions or on running every installed pellet mill at full nameplate load.

The commercial case should be evaluated from actual local feedstock contracts, electricity tariff, labor cost, maintenance, pellet selling price and customer payment terms. Those figures vary too much to support a universal three-month payback claim.

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Two Containers Through Sihanoukville

New equipment for the 2–3 T/H biomass pellet plant in Cambodia was shipped from Qingdao Port to Sihanoukville Port, Cambodia. The shipment departed on November 15, 2023 and arrived on December 10, 2023. Sea freight for two 40-foot containers was about US$3,800, while customs clearance and inland trucking to Kampong Speu added about US$1,200.

The use of Sihanoukville is consistent with Cambodia’s main deep-sea container route. Once cleared, the machines moved inland to Kampong Speu, where the retrofit sequence was coordinated with foundation work, electrical changes and installation inside the existing production building.

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US$260,000 Fixed Investment on an Existing 4,000 m² Site

The project reused an existing leasehold site and selected equipment. Completed fixed investment is approximately US$260,000; the broader US$300,000 funding envelope includes about US$40,000 of initial working capital.

Existing operation acquisition and site access – about US$25,000.
This covered the usable inherited equipment and the commercial transfer associated with taking over the operating location.

New and upgraded process equipment – about US$141,000.
This includes added grinding capacity, three new MZLH420 pellet mills, conveyors, baghouse, cooler, capture hoods and supporting process equipment.

Building electrical safety installation and commissioning – about US$94,000.
This portion covers workshop modifications, foundations, internal electrical distribution, fire and dust-control interfaces, shipping and inland handling, mechanical installation, commissioning and startup spares.

The remaining funding was retained as working capital for raw-material purchases, bags, payroll, electricity and customer credit. Keeping working capital separate from fixed investment makes the completed project cost more useful for buyers comparing retrofit and greenfield options.

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Why Mixed Biomass Fits This Cambodia Industrial Fuel Project

Cambodia’s industrial biomass opportunity is tied to agricultural and wood-processing residues rather than one standardized feedstock. Rice processing supplies husk and straw, while sawmills and woodworking plants add clean woody residues. For a Cambodia biomass pellet production line, that mix creates both opportunity and engineering constraints:

• Rice husk is widely available from rice milling but contributes more ash than clean wood and must be controlled in the recipe.
• Sawdust and untreated solid-wood offcuts provide a useful woody fraction but require reliable supplier screening.
• Industrial boilers, brick, cement and other heat users can create local demand for densified biomass without requiring export-grade wood pellets.

The project is therefore positioned as an industrial fuel pellet plant in Cambodia, not as an ENplus-style pure wood pellet factory. Product quality should be agreed with the actual boiler user for ash, moisture, pellet diameter, durability and allowable agricultural-residue content.

The most realistic buyer groups for this project include:

• Cement and mineral-processing plants using solid biomass as part of their thermal fuel mix
• Brick and ceramic producers with biomass-compatible combustion systems
• Garment, food and light-industry factories operating steam boilers
• Local fuel distributors and smaller commercial boiler users around Phnom Penh and surrounding provinces

The plant should expand only when raw-material contracts, dust and cooling capacity, electrical supply and finished-product demand all support the next step. Adding another pellet mill before those systems are checked would simply move the bottleneck elsewhere.

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Commissioning Focused on Stability Not Peak Tonnage

Startup work concentrated on the points where a mixed-biomass retrofit can become unstable: moisture, particle-size variation, feed bridging, ash contribution, pellet-mill load and common cooler capacity.

Three changes mattered most:

• Moisture checks were moved into receiving so wet straw or sawdust could be held back before it affected all four pellet mills.
• The counterflow cooler was treated as a production constraint, not an accessory; pellet mills are scheduled so the common cooler is not overloaded.
• Blend decisions began using ash and feed behavior as well as raw-material price, preventing cheap rice husk from becoming an uncontrolled substitute for the wood fraction.

Maintenance priorities:

• Keep one moisture meter in the receiving area and record each supplier batch before storage.
• Reduce manual loader blending only when the existing method becomes the real production bottleneck; automation should follow throughput need.
• Keep dedicated spare dies, roller parts, bearings and filter bags so one maintenance event does not force unnecessary plant downtime.

The operating lesson is simple: a retrofit succeeds when the owner controls material and process variability instead of assuming that adding more pellet presses automatically fixes an unstable plant.

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When This Retrofit Model Makes Sense

A 2–3 T/H biomass pellet plant in Cambodia can follow this retrofit logic when a buyer already has a usable building, part of the material-handling system or an operating biomass business. It should not be copied blindly into a project with wet green biomass, contaminated demolition wood or a single export customer.

• Start with the annual mass balance. Confirm how many tons of sawdust, rice husk, rice straw and clean wood residues are truly available through the full year.
• Size dust and cooling with the pellet section. Adding presses without enough extraction or cooler capacity creates a new bottleneck instead of a larger factory.
• Define the fuel specification before fixing the blend. Rice husk and rice straw can be useful industrial fuel materials, but ash and combustion behavior must match the customer’s boiler.
• Reuse only equipment that still has engineering value. An existing machine is an asset only when its capacity, safety condition and maintenance cost fit the rebuilt process.

This project works because the customer reused the right assets, rebuilt the missing process stages and matched capacity to 12,000 T/Y rather than chasing a larger headline number. That is a very different investment logic from building a new export pellet factory from an empty site.

For a similar Cambodia biomass pellet plant or an existing-factory retrofit, the useful starting information is your annual raw-material list, moisture range, available building area, current equipment, target pellet specification, working hours and buyer type. With those inputs, RICHI can determine what should be kept, upgraded or replaced before an equipment package is quoted.