1–2 T/H Biomass Pellet Production Line in Zambia

RICHI MACHINERY

The Wetter Feedstock Set the Engineering Direction

The customer contacted RICHI in August 2023 after several years in agricultural trading. He already had access to a usable industrial building, grid electricity and water, but the raw-material opportunity was split between two very different residue streams. Furniture factories around Lusaka could supply sawdust, while bamboo-processing activities generated a coarser powder with noticeably higher moisture.

Instead of starting from a machine list, the project was screened around three constraints: only about 3,000 tons of residue could be secured annually, the building offered about 1,100 m² of usable covered space, and the project budget had to stay close to the customer’s available capital. Those limits favored a compact line with one main pellet mill rather than a larger multi-press factory.

The customer’s target became a 1–2 T/H small biomass pellet plant in Zambia that could use both bamboo powder and sawdust without forcing the drier sawdust through unnecessary thermal treatment. That distinction is important for a bamboo pellet plant in Zambia because the dryer can become the highest operating-cost section long before the pellet mill reaches its nameplate capacity. The process therefore had to let the operator separate, test and meter the two feedstocks before deciding how much dryer duty each batch actually needed.

Material samples confirmed the reason for separating the moisture strategy. Bamboo powder was generally around 18–22% moisture, while sawdust was closer to 12–15%. A simple average hid the real operating issue: bamboo required active drying, but much of the sawdust only needed covered storage and moisture checking before blending.

The final biomass pellet production line in Zambia therefore uses a compact rotary dryer with a biomass furnace, a separate grinding stage for oversize material and one MZLH520 pellet mill. The dryer can be bypassed or run at lower duty when incoming sawdust is already within the pelleting moisture window.

RICHI MACHINERY

Two Feedstocks Require Two Moisture Decisions

The customer established purchasing arrangements with bamboo processors and furniture or woodworking businesses serving the Lusaka market. The objective was not to force a permanent 50/50 blend every day, but to maintain roughly equal annual availability so the operator could adjust batches according to moisture, particle form and actual supplier deliveries.

The two materials are complementary from a processing standpoint, but the final blend is controlled by test results rather than by a fixed calorific-value assumption. Bamboo powder can raise fiber variability and dryer duty, while sawdust generally improves flow consistency and gives the pellet mill a more uniform wood fraction. Both materials are screened for contamination before they enter the production route.

Moisture loss changes the annual mass balance. Starting with about 3,000 tons of as-received material, the project produces roughly 2,800 tons of gross pellets after drying and normal screening losses. Around 50–70 tons per year can be recycled as biomass-furnace fuel, leaving approximately 2,730–2,750 tons of saleable product depending on actual incoming moisture and dryer duty.

RICHI MACHINERY

Dryer Duty Changes With Each Incoming Lot

Bamboo powder arriving at 18–22% moisture cannot be sent directly to stable industrial pelleting. Excess moisture makes die loading less predictable and can leave warm pellets vulnerable to cracking, deformation or storage problems after bagging. The target for material entering the pellet mill is normally about 10–12%.

The project uses a compact rotary drum dryer approximately 1.5 m in diameter and 6 m long. A direct-heating biomass furnace supplies hot gas, but the dryer is operated selectively: wetter bamboo batches receive full drying duty, while sawdust near the target range can bypass intensive drying. This reduces unnecessary fuel use and prevents already-dry material from being overdried. Dryer discharge is checked before it enters the pellet section because the MZLH520 can only use its installed 1.5–2.0 T/H capacity when moisture and particle size remain reasonably stable. A dryer that sends alternating wet and overdried material downstream would create more pellet-mill instability than the extra thermal capacity solves.

Dryer operating basis:

• Type: compact rotary drum with direct hot-air heating
• Length: approximately 6 meters
• Diameter: approximately 1.5 meters
• Heat source: biomass furnace using a small share of self-produced pellets
• Typical wetter-feed inlet moisture: 18–22%
• Target outlet moisture: 10–12%
• Typical retention time: about 15–20 minutes, adjusted to feed moisture

The dryer and furnace account for about US$18,000 of the equipment package. In a project of this size, that is a large share of the machinery budget, but it is what makes the bamboo stream usable. Without controlled moisture reduction, the customer would effectively be limited to the drier sawdust fraction and the annual raw-material base would become too small for the planned business.

RICHI MACHINERY

One Pellet Mill Is Enough When the Annual Tonnage Is Honest

Equipment package (EXW basis): approximately US$58,000

The air compressor was sourced locally in Lusaka, which simplified replacement parts and avoided using container space for a standard utility item that could be purchased competitively in Zambia. The complete line has an estimated connected electrical load of about 210–230 kW once the 132 kW pellet mill, 37 kW hammer mill, dryer drive, conveyors, baghouse, compressor and auxiliary fans are included. Under one-shift operation, annual electricity demand is expected to be roughly 260,000–300,000 kWh, depending mainly on how often the hammer mill and dryer operate. Process-water demand is low; water use is mainly for staff, cleaning and fire protection, with no wet production stage.

Shipping: Two 40-foot containers left Qingdao in October 2023 and arrived at Dar es Salaam in late November. Sea freight was about US$4,200. Because Zambia is landlocked, the route continued on the TAZARA corridor toward New Kapiri Mposhi, followed by road delivery to the Lusaka-area project. Rail freight was budgeted at about US$3,500 and final inland trucking at about US$500.

RICHI MACHINERY

1,100 m² of Covered Space Had to Carry the Whole Process

The customer already had about 1,100 m² of usable covered industrial space. The project therefore did not depend on a new workshop. Production, raw-material buffering and finished-pellet storage were fitted into the existing building, with the dryer and dust-exhaust arrangement positioned to keep hot-gas equipment separated from the main bagging and warehouse area. Only 200 m² is assigned to dedicated raw- and finished-product storage, so material turnover has to remain relatively fast. Bamboo powder and sawdust cannot be accumulated for several months without either blocking the building or increasing moisture and fire-management risk. The compact storage plan therefore matches the one-shift production schedule and short-haul supplier network rather than a large seasonal inventory strategy.

RICHI MACHINERY

The Process Bypasses Machines When the Material Does Not Need Them

The Zambia biomass pellet plant uses a short process, but it is not a rigid one-direction route. Fine sawdust can bypass heavy grinding, and material already near 10–12% moisture does not need the same dryer duty as wetter bamboo powder. That flexibility is what keeps a small line from wasting energy on unnecessary processing.

Step 1 – Screening
Bamboo powder and sawdust enter a trommel screen with approximately 10 mm openings. Oversize pieces are separated for size reduction, while suitable fine material continues toward moisture control. Foreign matter is removed before it can reach the hammer mill or pellet press.

Step 2 – Crushing
Only oversize or agglomerated material is sent through the hammer mill. The target for the pellet-grade fraction is generally around 3–5 mm. Fine sawdust that already meets this range can bypass the crusher and rejoin the material stream downstream.

Step 3 – Drying
Moisture is checked before material enters the rotary dryer. Wetter bamboo batches are reduced from roughly 18–22% toward 10–12%. Drier sawdust can receive lighter treatment or bypass the drum, which prevents overdrying and reduces furnace-fuel consumption.

Step 4 – Pelleting
Prepared material enters the biomass granulator section. One MZLH520 provides about 1.5–2.0 T/H of installed capacity, while the project is marketed as a 1–2 T/H line. The standard industrial fuel product uses an 8 mm die, and natural lignin in the bamboo and wood fraction supports pellet formation without routine chemical binder addition.

Step 5 – Cooling
At this small output, pellets are transferred on an extended conveyor and allowed to lose heat before bagging. Operators do not pack pellets directly from the die. Bagging begins only after pellet temperature has fallen sufficiently to avoid condensation inside woven bags; if future output increases, a compact forced-air cooler should be added before expanding pellet-mill capacity.

Step 6 – Bagging and storage
Finished 8 mm pellets are packed mainly in 25 kg woven polypropylene bags. Bags are palletized inside the finished-goods area, kept dry and dispatched on a first-in, first-out basis so older batches are not left through extended humid periods.

Step 7 – Dust collection
A baghouse filter captures dust from screening, grinding, transfer and the biomass pellet press area. Suitable collected fines are returned to the process. A 15 m stack serves treated process air, while a separate 20 m stack handles dryer exhaust from the biomass-fired system.

RICHI MACHINERY

The Market Is Real but Still Smaller Than Charcoal

This Zambia biomass pellet production line operates in an energy market where firewood and charcoal still dominate household cooking and heating. That makes it unrealistic to describe pellets as a mainstream household fuel. The stronger early market for a small producer is institutional and industrial heat: users that can buy repeat volumes, store bagged fuel and operate equipment designed for densified biomass. A small biomass pellet line in Zambia also has to account for the country’s landlocked logistics. Imported machinery reaches the project through a regional seaport and inland corridor, while finished pellets should ideally be sold within a much shorter radius. Shipping low-value fuel long distances after production would quickly erode the advantage created by using local residues.

• Bamboo is an established non-wood forest product in Zambia, but supply is local rather than uniformly abundant, so contracted sourcing matters
• Woodworking and furniture activity around Lusaka creates a practical sawdust stream for small-scale pellet production
• Charcoal remains important in Lusaka, creating a clear price and convenience benchmark that pellets must compete against rather than assuming automatic substitution

The customer’s target buyers are therefore grouped by heat-use compatibility rather than by a single retail channel:

• Industrial and agro-processing users with boilers or furnaces able to use 8 mm biomass pellets
• Schools and institutional kitchens that can store bagged fuel and operate compatible stoves
• Local distributors serving smaller commercial and household users where pellet-compatible equipment already exists

Expansion is not treated as automatic. Before adding another pellet mill, the customer needs to confirm a larger dry-feedstock base, additional cooling capacity, electrical headroom and recurring sales above the current gross output of about 2,800 T/Y. The next bottleneck may not be pelleting at all. If more bamboo enters the mix, dryer duty could become limiting first; if sales shift toward smaller retail bags, packing labor could become the constraint; and if the feedstock stays dry but annual supply rises, covered storage may need to expand before any additional press is installed.

RICHI MACHINERY

Moisture Measurement Matters More Than Chasing Peak Output

After startup, the operating team found that the most useful production records were moisture, dryer temperature, pellet-mill current and bagged-pellet condition. A small plant has little buffer between one poor raw-material batch and finished-product quality, so measurement is more valuable than relying on visual judgment alone.

Operating practices that proved valuable:

• The dryer makes the bamboo stream usable instead of forcing the business to depend only on sawdust
• The baghouse keeps fines from accumulating around the hammer mill, pellet mill and transfer points

Priorities for tighter daily control:

• Use a moisture meter at receiving and after drying so the operator can reduce dryer duty before material becomes too dry and brittle
• Track packing time and labor demand; if sales volume rises, a small automatic bagging scale should be added before increasing pellet capacity

RICHI MACHINERY

RICHI Scope Focused on the Moisture Problem

For this 1–2 T/H bamboo and sawdust pellet plant in Zambia, the supply scope covered the process sections needed to turn two different moisture streams into one stable industrial fuel product:

• Process design – Raw-material screening, selective drying, grinding bypass logic, dust collection and pellet routing.
• Equipment package – Screen, hammer mill, rotary dryer, biomass furnace, MZLH520 pellet mill, conveyors and baghouse.
• Installation supervision – Site guidance for equipment positioning, ducting, electrical interfaces and startup checks.
• Operator training – Moisture measurement, dryer control, die inspection, pellet-mill loading and safe furnace operation.
• Spare parts kit – Ring-die and roller wear parts, hammer-mill screens, bearings, belts and filter bags sized for early operation.

A simple dryer-temperature controller was also included as an add-on so the operator could manage hot-air conditions more consistently as bamboo and sawdust proportions changed.

RICHI MACHINERY

A Small Zambia Pellet Line Should Be Sized From Dry Tons

If you are evaluating a small biomass pellet plant in Zambia or another landlocked Southern African market, the most useful capacity number is not the wet feedstock tonnage delivered to the gate. It is the amount of material remaining after moisture reduction, screening loss and any pellets recycled as dryer fuel.

• Measure bamboo moisture before sizing the dryer. A feedstock arriving at 18–22% needs a different thermal duty from sawdust arriving near 12–15%.
• Blend for process stability, not a fixed marketing formula. Bamboo powder and sawdust should be combined according to moisture, particle form and actual pellet behavior.
• Use self-produced fuel only within the real heat balance. The furnace can consume a small share of finished pellets, but that internal use must be deducted from saleable annual output.
• Build the first sales base around compatible heat users. Industrial boilers, institutional kitchens and commercial distributors are more realistic early buyers than assuming mass household conversion.

The business case is strongest when the customer has reliable bamboo or sawdust contracts, a covered storage area and buyers that already understand densified biomass. Those three conditions matter more than an aggressive nameplate-capacity claim. For a small producer, the useful question is how many dry tons can be converted and sold every month after moisture loss, furnace-fuel use, fines recycle and scheduled maintenance. That number is more valuable for investment planning than multiplying a pellet mill’s maximum hourly rating by every calendar hour in the year.

For a similar biomass pellet project, send the annual feedstock tonnage by material, moisture range, working hours, existing building dimensions and target fuel users. RICHI can then size drying, grinding, pelleting, dust control and packing around the actual dry-ton balance.