Biomass Pellet Plant for Mixed Agricultural Residues in Myanmar

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Why Myanmar? Why Mixed Agricultural Residues?

Myanmar’s energy situation is complicated. The national grid is unreliable, and many industrial facilities run on diesel generators. Electricity costs for factories range from 120 to 150 kyat per kWh, which is about 0.06 to 0.07 US dollars, but blackouts happen daily in some regions. Diesel is expensive, at about 2,500 kyat per liter, or roughly 1.20 US dollars.

The client’s target customers are:

• Rice mills (there are hundreds in Bago Region). Rice mills produce husks as a byproduct, but many still use inefficient husk-fired furnaces. Pellets burn more cleanly and consistently.
• Textile factories in the Hlaingthaya and Shwelinban industrial zones. These factories need steam for dyeing and finishing. Most use fuel oil or coal. Pellets are about 40% cheaper per unit of energy.
• Poultry farms (for heating brooder houses in winter—yes, Myanmar has a cool season from November to February). Farmers currently use charcoal or LPG. Pellets are cheaper.

The client chose a biomass pellet plant that can handle mixed residues because no single feedstock is available year-round in sufficient quantity. Rice husks are abundant from December to March (post-harvest). Corn stalks are available from August to October. Wood waste is steady year-round but limited volume. A single-feedstock plant would have downtime. A mixed-feedstock plant runs continuously.

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Raw Material Sourcing 

Within 100km of the plant, the client has secured supply agreements with:

• Rice mills (6 mills, total 1,800 tons of rice husks annually)
• Wood processing shops (sawmills in Bago and Taungoo, furniture factories in Yangon) for offcuts, sawdust, and trim
• Farmers (corn growers, bean growers) for stalks and straw
• Village collection points for waste wood (old fences, tree branches, bamboo)

The raw material mix for the first year:

Wait, 10,000 tons input for 8,000 tons output? Yes. The difference (about 2,000 tons) is water evaporated during drying (the client uses an electric dryer, so no combustion products added), plus about 20 tons of dust captured in bag filters (recycled back into the process), plus rejects and fines.

Important note on raw material quality: The client strictly prohibits any material that contains paint, adhesive, laminate, or other synthetic coatings. No old furniture, no construction waste with glue, no treated wood. All suppliers sign contracts with this clause. The client visually inspects every incoming load. Contaminated loads are rejected back to the supplier.

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The Site and Building 

The property is a former brick factory that stopped operating in 2019. The original buildings were old and unsafe. The client demolished three old structures and built new ones within the approved blue line boundary.

Current layout:

Production building layout (inside):

The building is divided into two main zones:

• North end: Raw material storage (700m²) for material that has been sorted but not yet processed
• South end: Processing equipment, arranged in sequence from west to east

Inside the processing area, the equipment follows the material flow:

The client chose this layout because raw material comes in from the west yard. The shortest path is crusher → hammer mill → bin → dryer → pellet mill → silo → packaging. No back-and-forth movement.

One thing the client did right: He put the biomass pellet mill and packaging area near the finished goods storage (northeast corner). That’s where trucks load out. Short transport distance for finished goods.

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Equipment Configuration

Why one large pellet mill instead of two smaller ones? 

The client’s calculation: a single 250kW mill can do 3-4 t/h reliably. Two 125kW mills would cost about 35% more (two sets of bearings, two die assemblies, two motors, twice the maintenance).

The risk of downtime is higher with one mill, but the client accepted that risk in exchange for lower capital cost. He keeps spare parts (die, rollers, bearings) on site. A die change takes 2 hours. That’s acceptable for his operation.

Why an electric dryer instead of a combustion dryer? 

The client considered a biomass-fired hot air furnace (using self-produced pellets). But Myanmar’s environmental regulations for biomass combustion are strict in Bago Region after complaints about smoke from rice husk burning. An electric dryer produces no combustion gases—just warm, clean air.

The higher electricity cost (about 30% more than gas-fired) is offset by simpler permitting and zero exhaust treatment requirements. Also, the client’s grid power in this industrial zone is relatively stable (outages 2-3 hours per week, manageable with a small generator for controls).

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Process Flow

Step 1: Raw Material Receiving and Sorting

Trucks and pickups arrive at the site. The driver unloads onto the open yard (for large material) or into the undercover area (for smaller material).

Sorting is done manually by two workers. They remove:

• Stones and dirt (common in rice husks and stalks)
• Metal (nails, screws, wire—detected visually and by magnetic separator later)
• Plastic bags and ties
• Painted or treated wood (rejected completely)

The client trained his workers to identify contaminated material. In the first month, about 8% of incoming loads were rejected. By the third month, suppliers learned what was acceptable and rejections dropped to 2%.

Step 2: Pre-Drying for Wet Material (Natural Method)

Some raw materials are too wet for direct processing:

• Green waste wood (40% moisture)
• Fresh corn stalks (35-40% moisture)
• Bamboo (fresh-cut, 45-50% moisture)

These are spread on the concrete pad in the yard for 2-5 days of sun drying, depending on weather. Myanmar’s dry season (November to May) has very low rainfall—excellent for sun drying. During the wet season (June to October), the client either buys drier material or reduces production.

Target moisture after sun drying: Below 25% for wood, below 20% for stalks.

Step 3: Crushing (For Oversized Material Only)

Material larger than about 10cm goes into the primary crusher:

• Wood offcuts
• Waste wood pieces
• Tree branches
• Bamboo sections

The crusher (75kW) uses a 1,250mm rotor with swinging hammers. It runs at 650-750 RPM. Output target: 3-5cm pieces.

Why 3-5cm? The hammer mill below operates most efficiently with feed size under 8cm. 3-5cm gives good throughput without wasting energy on over-crushing.

A magnetic separator on the conveyor before the crusher catches ferrous metals. This is critical because waste wood often contains nails and staples. One nail can damage a hammer mill screen ($200replacement)orpunchholesinthedie($200replacement)orpunchholesinthedie(1,200 replacement).

Step 4: Hammer Milling and Screening

All material (crusher output plus smaller material that skipped the crusher) feeds into the hammer mill.

The hammer mill (90kW, YZ1300-500):

• Rotor width: 500mm
• Tip speed: about 85 m/s
• Screen size: Interchangeable (8mm for coarse, 6mm for fine)
• Throughput: 4-5 t/h on wood, 3-4 t/h on stalks and husks

Screening is integrated directly below the mill. A vibrating screen (with 8mm holes) separates:

• Oversize (>8mm): Returned to the hammer mill via a bucket elevator for re-grinding
• Acceptable (3-8mm): Falls through to the conveyor
• Fines (<3mm): Collected separately but mixed back in (fines are fine—they help binding in the pellet mill)

Particle size target: 3-8mm range. This is important. Too fine (<2mm) and the material flows too fast through the pellet mill, reducing die life. Too coarse (>10mm) and the pellet mill struggles to pull material into the die holes.

Step 5: Storage of Milled Material (Buffer)

Milled material drops into a 10m³ steel bin with a cone bottom (60° angle for good flow).

Why a buffer bin? The hammer mill runs continuously. The dryer and pellet mill need consistent feed. The bin smooths out fluctuations. It also allows the client to keep different material types separate if needed (e.g., running 100% rice husks for a specific customer order). The bin has a level sensor. When the bin is full, an indicator light tells the operator to pause the hammer mill.

Step 6: Drying

(This is the most energy-intensive step. The client chose electric drying for regulatory reasons, but it costs more to operate.)

Milled material from the storage bin is fed into the rotary drum dryer via a screw conveyor.

Dryer specifications:

• Type: Rotary drum, direct heating (electric)
• Drum dimensions: 2.0m diameter x 24m length
• Heating elements: 120kW electric resistance heaters
• Airflow: 20,000 m³/h (circulated)
• Drum rotation speed: 8-12 RPM
• Retention time: 8-12 minutes (adjustable)
• Outlet temperature: 85-90°C
• Inlet material moisture: 15-40% (depending on feedstock)
• Outlet material moisture: 10-12%

How the electric dryer works:

1. Electric heating elements warm incoming air to 180-200°C.
2. A blower forces this hot air into the rotating drum.
3. The drum has internal flights (angled plates) that lift the material and cascade it through the hot air stream.
4. Moisture evaporates and is carried out with the exhaust air.
5. Exhaust air passes through a cyclone (removes coarse dust) then a bag filter (polishing) before being vented to atmosphere.
6. The bag filter dust is returned to the dryer inlet.

Why 85-90°C outlet temperature? This is hot enough to dry material from 20-30% down to 10-12% in 10 minutes, but not so hot that the material ignites or the lignin starts softening prematurely (lignin softens at 70-100°C, so some softening happens in the dryer—that’s actually helpful for pelletizing).

Moisture monitoring: The client checks moisture every 30 minutes using a portable meter. The dryer operator adjusts feed rate based on readings. Too wet? Slow the feed. Too dry? Speed it up.

Step 7: Pelletizing

(The pellet mill is the heart of the line. But it’s also the most finicky. Temperature, moisture, and particle size all have to be in the right range.)

Dried material (10-12% moisture, 70-80°C temperature) is conveyed to the pellet mill inlet.

Pellet mill specifications (ring die type, 250kW):

How the pellet mill works (briefly):

1. Material falls into the feed port and spreads across the inside of the rotating die.
2. The stationary rollers press the material against the die.
3. Material is forced through the die holes under high pressure (about 150-200 MPa at the roller contact point).
4. Friction heats the material to 90-110°C. This softens the lignin naturally present in wood and plant fibers.
5. Softened lignin acts as a binder, holding the particles together.
6. The continuous rod of pellets exits the die and is cut to length by a rotating knife.

No added binders. The natural lignin content in the mixed feedstock (wood provides lignin; rice husks and stalks have less lignin but still enough) is sufficient for binding when heated.

Pellet quality during trial runs:

Knife adjustment: The cutting knife distance from the die face is set to about 35mm. The pellets “squirt” out of the die and swell slightly before the knife cuts them. The actual cut length is about 25-35mm. The client adjusts the knife for each material type: shorter for rice husks (which are more brittle), longer for wood (which holds together better).

Step 8: Cooling

Hot pellets (85-95°C) are pneumatically conveyed (air velocity about 25 m/s) to the 50-ton cooling silo.

The cooling silo:

• Stainless steel construction (no rust contamination)
• 50 tons capacity (about 6.25 hours of production at 8 t/hour—but actual throughput is 3-4 t/h, so 12-16 hours of buffer)
• Perforated cone and perforated sidewalls
• A small fan (3kW) pushes ambient air up through the pellet bed when the silo is being filled

Cooling time: Pellets reach ambient temperature (25-32°C in Bago) after about 4-6 hours in the silo. The client typically lets pellets cool overnight before packaging. He runs a single shift (08:00-16:00), so pellets produced on Monday are packaged on Tuesday morning.

Moisture drop during cooling: Pellets exit the mill at 10-11% moisture. After cooling, moisture is 8-10%. The client’s spec (from the DB43/T 864-2014 standard they adopted) requires ≤13% moisture. He’s comfortably below that.

Why no mechanical cooler? A counterflow cooler would cost about $18,000 and require another 7.5kW motor plus a bucket elevator to lift pellets to the packaging line. The client calculated that silo cooling plus night-time storage works fine at 3-4 t/h. If he expands to 6-8 t/h later, he’ll add a mechanical cooler.

Step 9: Packaging

Cooled pellets are discharged from the silo onto a belt conveyor that feeds the automatic bagging scale.

Bagging scale specifications:

• Type: 325ZJ, semi-automatic
• Capacity: 8-10 bags per minute (25kg bags)
• Accuracy: ±100g
• Bag types: 25kg woven poly bags (standard), 50kg bags (on request)

Packaging process:

1. Operator hangs an empty bag on the filling spout.
2. Presses a button.
3. Scale fills to 25kg target.
4. Operator removes the bag and moves it to the sewing station.
5. Bags are sewn closed with a portable bag closer (manual).
6. Bags are stacked on pallets (45 bags per pallet for 25kg = 1,125kg per pallet).
7. Pallet wrapped in stretch film, labeled, moved to finished goods area.

The client sells pellets mostly in 25kg bags to small industrial customers. A few larger customers (a textile factory, a rubber processing plant) buy in bulk (tipper trucks), but that’s less than 10% of volume.

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Utility Requirements and Consumption

Actual power consumption breakdown (per 8-hour shift):

Per ton: 3,846 kWh ÷ 27 tons/day (at 3.4 t/h × 8 hours) = about 142 kWh/ton.

Annual electricity cost: 500,000 kWh × 75 kyat = 37.5 million kyat (about $18,000 USD at 2,100 kyat/USD exchange rate—but the kyat has been volatile, so this is approximate).

The client installed a 50kVA diesel generator for backup during grid outages. He rarely needs it (outages in Bago industrial zone are 2-3 hours per week, mostly announced in advance), but the generator is there for critical equipment (the pellet mill, which takes 2 hours to cool down properly).

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Environmental Compliance 

Myanmar’s environmental regulations are less developed than many countries, but Bago Region has its own rules. The client needed approvals from:

1. Bago Region Government (land use permit for the brick factory conversion). This took 3 months and cost about 500,000 kyat ($240) in fees.
2. Ministry of Natural Resources and Environmental Conservation (MONREC) for air emissions. The electric dryer simplified this—no combustion means no SO2, no NOx from the drying process.
3. Local township office for noise and dust management.

Key compliance measures the client implemented:

Solid waste management:

• Dust from bag filters (~15 tons/year) → recycled back into material stream
• Screen oversize and rejects (~5 tons/year) → re-pelletized
• Metal scrap from magnets (~2 tons/year) → sold to scrap dealer in Bago
• Empty lubricant drums → returned to supplier for refill
• Office/laboratory waste → municipal collection (50,000 kyat/year fee)

No hazardous waste. The client uses lubricants only for equipment maintenance, and used oil is collected by a licensed contractor (the same one who services his forklifts).

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How RICHI Machinery Customized This Line for the Client’s Needs

The client had several specific requirements that shaped the equipment selection and layout:

Requirement 1: Handle seven different raw material types (wood offcuts, furniture trim, waste wood, rice husks, corn stalks, bean straw, bamboo).

Our solution: Multiple feed points into the size reduction system. The crusher is positioned at the west yard entrance for large material. A separate manual feed hopper for small material (rice husks, sawdust) bypasses the crusher and goes directly to the hammer mill. The client can switch between material types without stopping the line.

Requirement 2: No combustion-based drying (due to local permitting concerns).

Our solution: Electric rotary drum dryer with 120kW heating capacity. This adds about $15,000toequipmentcostcomparedtoabiomasshotairfurnace,buteliminatestheneedforaflarestack,combustioncontrols,andexhaustscrubbingforcombustiongases\mathrm{.}Theclientsavesabout$15,000toequipmentcostcomparedtoabiomasshotairfurnace,buteliminatestheneedforaflarestack,combustioncontrols,andexhaustscrubbingforcombustiongases.Theclientsavesabout10,000 in permit fees and 3 months of waiting time.

Requirement 3: Existing building has 12m ceiling height—enough for vertical stacking of equipment.

Our solution: Stacked arrangement of crusher (top), hammer mill (middle), and screener (bottom). Material flows by gravity from one stage to the next. This saved about 30 meters of conveyor and eliminated one bucket elevator. Total height from floor to top of crusher is 7.5m, well within the 12m ceiling.

Requirement 4: The client’s operators have no previous pellet production experience.

Our solution: Simplified control panel with manual override for all critical parameters. We provided a 2-week on-site training program (included in the contract) covering:

• Raw material sorting and moisture testing
• Adjusting hammer mill screen size and replacing screens
• Drying temperature control
• Pellet mill die and roller adjustment
• Daily and weekly maintenance schedules
• Troubleshooting common problems (die plugging, belt slipping, bearing overheating)

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Product Quality and Specifications

The client’s product meets the requirements of DB43/T 863-2014 (biomass成型燃料 for industrial use):

The rice husk pellets have lower heating value (about 16.5-17.0 MJ/kg) because rice husks have higher ash content. The client sells these at a slightly lower price (about 5% discount) or to customers with less demanding boilers.

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Market Opportunity for Biomass Pellets in Myanmar

Myanmar’s energy mix is shifting. The government has been promoting renewable energy to reduce dependence on imported diesel and to manage the country’s deforestation problem (illegal logging for firewood is a major issue).

Current market for biomass pellets:

Current domestic pellet production is only about 15,000-20,000 tons per year. The gap is significant.

Competition: Most existing pellet producers in Myanmar are very small (500-1,500 tons/year) using basic equipment. The client’s 8,000 tons/year facility is one of the larger ones. His cost per ton is about 15-20% lower than smaller competitors because of economies of scale.

Export potential: Thailand and China both import biomass pellets. From Yangon port, shipping to Bangkok is 3-4 days, to southern China about 7-10 days. But export requires ENplus certification or equivalent, which adds quality control costs. The client is focusing on the domestic market for now.

Risks the client is aware of:

1. Currency volatility. The kyat has fluctuated between 1,700 and 3,500 per USD in recent years. The client bought equipment when the kyat was relatively strong (2,250). If the kyat weakens significantly, his imported spare parts (dies, screens, bearings) become more expensive.
2. Power reliability. Grid outages still happen. The client installed a 50kVA generator for essential equipment, but running the whole plant on diesel during a long outage would be expensive (about 500,000 kyat per day in fuel). He’s considering adding a second generator in year two.
3. Raw material competition. As more pellet plants start up, prices for rice husks and sawdust could rise. The client has locked in 2-year supply contracts with his main suppliers at fixed prices.

Why this biomass pellet project makes sense despite the risks:

The numbers work. Even with conservative assumptions (7,200 tons/year, 150,000 kyat/ton selling price), the gross profit is about 274 million kyat annually. That’s a 100% return on total investment in year one. Few industries offer that kind of return.

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Thinking About a Similar Project?

We’ve learned a few things from this Myanmar biomass pellet manufacturing plant project that might help you:

Electric drying is viable for small to medium lines if your electricity is cheap and stable. The client’s power cost (75 kyat/kWh ≈ 0.036) is low by global standards. Atthatrate, electric drying costs about 4.70 per ton. A biomass-fired dryer would save about 2 per ton in energy but add 10,000-15,000 in equipment cost and more complex permitting. Do the math for your location.

Multiple feedstock capability is worth the extra complexity. The client runs about 60% wood-based material and 40% agricultural residues. If wood prices spike, he can shift to more rice husks. If rice husks are scarce after harvest, he uses more wood. Flexibility reduces raw material risk.

Myanmar is a good market for pellet equipment right now. The regulatory environment is manageable. Labor is affordable (skilled operators at 120,000 kyat/month ≈ $55). Raw material is abundant. And demand for alternatives to diesel and firewood is growing.

Don’t underestimate local conditions. The client’s building had an uneven floor. The power supply needed upgrades. The yard needed drainage to keep raw material dry during monsoon season. We helped him address these during the design phase. A site visit is essential before finalizing any equipment list.

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Considering a Biomass Pellet Plant for Mixed Agricultural Residues?

Every project is different because every country has different raw materials, different energy costs, and different regulations.

What we need to know to help you:

1. What agricultural residues are available within 100km of your site? (Type, annual volume, moisture, price)
2. What’s your electricity cost (per kWh) and reliability (hours of outages per week)?
3. Do you have access to waste wood? (Sawdust, offcuts, construction scrap—but only untreated)
4. What’s your target market? (Industrial boilers, heating, power generation, export)
5. Do you have an existing building? (Dimensions, ceiling height, floor condition)
6. What’s your target output? (Our client does 8,000 tons/year on this line, but we have designs from 2,000 to 30,000 tons/year)

Send us your answers. We’ll reply within 7 business days with a preliminary process flow, equipment list, and budget estimate. No obligation. Just engineering.

RICHI Machinery – Biomass pellet production lines from 0.2 t/h to 90 t/h, designed for mixed agricultural residues and wood waste. Shipping from Qingdao to Yangon port (Myanmar): 10-14 days. Installation support available in Southeast Asia within 1 week.