4-5T/H Peanut Shell Dryer in Tanzania

Project Background & Client Profile: A Standalone Dryer Investment

Client Identity: A former groundnut oil processor in Iringa, Tanzania, who decided to diversify into agricultural byproduct value addition. He had no prior experience with industrial drying equipment but understood the seasonal challenges of relying on sun drying.

Reason for Purchase: The client purchased this single rotary dryer because he already owned a small hammer mill and a manual briquette press. He needed a drying solution that could sit between these existing machines. The wet peanut shells from his oil pressing operation (which uses a mechanical screw press) came out with moisture content around 48%, too wet for efficient briquetting. Sun drying was unreliable. After losing nearly 18 tons of shells to rot during the long rainy season of 2023, he decided an industrial dryer was essential.

Raw Material Details:

• Primary material: Peanut shells collected from his own oil pressing operation and purchased from three neighboring groundnut farmers within a 30km radius.
• Moisture content as received: 45-50% wet basis, measured by a handheld moisture meter.
• Bulk density of wet shells: 180-220 kg/m³.
• Particle size: Variable, ranging from 5mm to 25mm, with some whole half-shells present. The client uses a coarse hammer mill before drying to reduce shell size to under 10mm for better drying uniformity.
• Desired output moisture: 12-15%, which allows for stable briquette formation without mold growth during storage.

Equipment Selection: φ1.2×12 model (1.2 meters in diameter, 12 meters in length).

• Diameter: 1.2 meters
• Length: 12 meters
• Layers: Single-pass design
• Rotational speed: 6 rpm (adjustable from 3-12 rpm via variable frequency drive)
• Inlet air temperature: 450°C
• Outlet air temperature: 75°C
• Processing capacity: 4-5 tons per hour of dried peanut shells

The client specifically selected this mid-sized rotary drum dryer because it matches his available feedstock supply of roughly 25 tons of wet shells per week. A larger φ1.5×15 model would have required a bigger biomass furnace and more labor, which he was not ready to commit to. A smaller φ0.8×8 would have been too slow, creating a bottleneck for his briquetting operation.

Why Peanut Shells? Tanzania's Agricultural Reality

Tanzania is East Africa's second-largest producer of groundnuts, after Sudan. The Southern Highlands region, including Iringa, Mbeya, and Njombe, accounts for over 60% of national production. Most groundnut processing happens at small-scale oil pressing facilities, and the shells are traditionally burned in the open or dumped in pits, creating smoke and attracting termites. The government of Tanzania has recently discouraged open burning of agricultural residues due to air quality concerns in urban areas like Iringa town.

The client's dried peanut shells are used for three distinct purposes:

1. Briquette production for cooking fuel: Mixed with 10% cassava starch as a binder, pressed into 50mm diameter briquettes that burn longer than charcoal and produce less smoke. These are sold to households and small restaurants in Iringa and Mbeya.
2. Animal bedding for dairy goats: A local cooperative that keeps 200 dairy goats purchases dried shells (not briquetted) as bedding material because the shells absorb moisture well and have natural antimicrobial properties.
3. Organic fertilizer base: Mixed with cow manure and left to compost for 60 days, the dried shells provide carbon structure that improves soil aeration for vegetable farmers in the nearby Ruaha River valley.

Shipping & Logistics: From Qingdao to Dar es Salaam Port

The RICHI φ1.2×12 rotary drum dryer was manufactured at our Qingdao, China, facility and loaded into a 40-foot open-top container. Total shipping weight including the main drum, support rollers, motor, gearbox, and a spare set of lifting flights was 8.6 metric tons. The equipment was shipped to Dar es Salaam Port, Tanzania's principal seaport handling over 95% of the country's industrial imports. Sea freight took 28 days via the Indian Ocean route, with a stop at Mombasa before final arrival in Dar es Salaam. From the port, the client arranged flatbed truck transport on the 500km journey west to Iringa, which took approximately three days due to road conditions in the Mikumi National Park corridor.

RICHI provided full customs documentation including a commercial invoice, packing list, bill of lading, and a certificate of origin to qualify for Tanzania's reduced import duty on agricultural processing equipment (5% instead of 10% for general machinery).

Rotary Dryer Versatility: Beyond Peanut Shells in Tanzania

While this installation is specifically a Peanut Shell Dryer in Tanzania, the RICHI rotary drum dryer is a universal drying platform that can handle dozens of materials. In the East African context, the same machine can be used for:

• Cassava pulp and peels: Tanzania produces over 7 million tons of cassava annually. Wet cassava pulp from starch extraction (65-70% moisture) can be dried to 10-12% for animal feed or flour blending.
• Coffee husks: The Iringa region has thousands of small coffee farms. Wet coffee processing leaves husks at 55% moisture. Dried husks are sold as fuel pellets or mushroom growing substrate.
• Maize cobs and stalks: After harvest, maize cobs containing 30-35% moisture can be dried to 10% for briquetting or direct burning in industrial boilers at textile factories in Dar es Salaam.
• Sawdust and wood shavings: Tanzania has a growing timber industry in the Mufindi district. Sawdust at 40-50% moisture (from fresh logs) can be dried to 8-10% for wood pellet production.
• Sunflower seed husks: A major byproduct of sunflower oil pressing in the southern highlands. Dried husks are compressed into fire logs that have become popular in Arusha and Moshi tourist lodges.

The client has already tested a batch of coffee husks (provided by a neighbor's wet mill) and plans to offer toll drying services to other farmers during the coffee and maize seasons. This additional revenue stream was not part of his original business plan but became obvious once the dryer was operating.

Technical Advantages of the RICHI Rotary Drum Dryer

Why did the Tanzanian client choose RICHI over cheaper Indian and Chinese competitors that offer dryers for $8,000-$12,000? Because those machines lacked critical features for tropical, high-humidity environments:

• Heavy-duty lifting flights: The internal lifting flights (material lifters) are made of 8mm thick manganese steel with a staggered bolt-in design. Cheaper dryers use 4mm mild steel flights that wear through within 6 months when processing abrasive peanut shells. RICHI flights last 3-5 years.
• Adjustable inlet and outlet dampers: These allow the operator to control the airflow rate and residence time based on the incoming moisture. During the short rainy season when shells arrive at 55% moisture, the damper is opened wider to increase airflow.
• Automatic temperature control panel: The control panel monitors inlet and outlet thermocouples and automatically adjusts the feeder speed to prevent overheating. If the outlet temperature exceeds 85°C, the feeder slows down, adding more material to cool the drum. This prevents fires, a real risk when drying oily materials like peanut shells which can auto-ignite around 200°C.
• Sealed trunnion rollers with grease fittings: The support rollers are protected by labyrinth seals that keep out dust, a common point of failure on dryers operating in dusty agricultural environments. The client greases the rollers every 40 hours using a simple hand pump.
• Direct drive with gearbox (not chain drive): Chain drives stretch and require frequent tensioning. RICHI uses a helical gearbox mounted directly to the drum ring gear, providing reliable torque even when the drum is heavily loaded with 5 tons of wet shells.

Customer Feedback: Six Months of Real Operation

After six months of continuous operation, the client spoke with RICHI's after-sales support team via WhatsApp. Below is a summary of his feedback, recorded during a routine check-in call:

"The dryer has run for 860 hours since installation in May. We processed 2,800 tons of wet peanut shells. The machine never broke down unexpectedly. We had one issue: the V-belt on the induced draft fan snapped after 500 hours. But that was a cheap fan belt, not RICHI's fault. The main drum gearbox is still quiet, no leaks. I check the lifting flights every month through the inspection door. Only two flights show slight wear at the edges, nothing serious. The automatic temperature control is the best feature. At night, when the ambient temperature drops to 18°C, the system maintains the outlet at 75°C without me touching anything. My workers learned to operate it in one week. We are now drying coffee husks for a cooperative of 30 farmers. They pay me 60,000 Tanzanian shillings per ton. This alone covers my diesel cost for the furnace."

The client also mentioned that he had initially been concerned about the 12-meter length of the dryer, worried it would take too much space. However, he mounted the drum on a simple concrete plinth and built a small shelter with corrugated iron sheets. The footprint, including the biomass furnace and cyclone separator, is approximately 20 meters by 8 meters, which fit easily on his 1-acre property.

RICHI's Pre-Sale Services That Built Trust

Before the Tanzanian client made any payment, RICHI provided several services that demonstrated expertise and built confidence:

• Free material testing: The client shipped 50kg of wet peanut shells (sealed in plastic bags) via air freight to Qingdao. RICHI engineers ran the shells through a laboratory-scale rotary dryer and provided a 12-page report showing the drying curve, optimal temperature settings, and predicted output moisture at different feed rates.
• Custom flight design: Based on the shell's low bulk density and tendency to stick to metal when wet, RICHI recommended a specific lifting flight arrangement: 60% closed flights (for lifting) and 40% open flights (for cascading). This pattern prevented shell buildup inside the drum.
• Furnace design consultation: The client planned to use peanut shells as fuel for the dryer's furnace. RICHI engineers calculated that burning 0.8 tons of shells per hour would generate enough heat to dry 4 tons of wet shells. A manual was provided showing how to build a simple brick combustion chamber with a heat exchanger to prevent sparks from entering the drum.
• Installation video tutorial: Instead of charging for an on-site engineer (which would have cost $5,000 plus travel), RICHI provided a 45-minute step-by-step video showing how to align the drum, install support rollers, and connect the electrical panel. The client's local welder followed the video and completed installation in four days.

Market Outlook for Processed Peanut Shells in Tanzania

The demand for processed agricultural byproducts in Tanzania is growing rapidly, driven by three factors:

1. Rising charcoal prices: A 40kg bag of charcoal now costs 25,000 shillings in Iringa, up from 12,000 shillings in 2020. Peanut shell briquettes sell for 15,000 shillings for a 30kg bag, offering similar heat value at lower cost.
2. Government reforestation programs: Tanzania has banned charcoal production in several districts to protect Miombo woodlands. This has created a supply gap that agricultural briquettes are filling.
3. Export potential: Dried peanut shells (not briquetted) are being purchased by a Kenyan company that manufactures biodegradable seedling trays. The client is negotiating a trial shipment of 20 tons to Nairobi.

The client's current production of 5 tons per day (dry basis) is sold entirely within a 100km radius. He employs four full-time workers and plans to add a second shift in 2025, which would require a larger dryer or possibly a second RICHI φ1.2×12 unit running in parallel.

Additional Applications of Rotary Dryers Across Tanzania

Beyond peanut shells, rotary drum dryers like the RICHI φ1.2×12 are finding uses in other Tanzanian industries:

• Fish feed production: In Mwanza on Lake Victoria, fish processors are drying Nile perch offal (heads, bones, viscera) to produce fishmeal for animal feed. The dryer reduces moisture from 70% to 10% in under 30 minutes, far faster than sun drying which attracts flies and rodents.
• Spice drying: In Zanzibar and Tanga, clove and cinnamon processors are testing rotary dryers to replace wood-fired drying racks. The controlled temperature (maximum 60°C for spices) preserves essential oils while cutting drying time from 3 days to 2 hours.
• Tea waste drying: In the Mufindi tea estates, tea leaf waste from CTC processing (20,000 tons annually) is dried and sold as boiler fuel. A tea estate manager recently inquired about the φ1.5×15 model for a pilot project.

RICHI has now supplied rotary drum dryers to over 15 customers in Tanzania, processing materials ranging from coffee husks in Moshi to rice husks in Mbeya. Each installation includes a 2-year warranty on the drum shell and one free remote troubleshooting session per month.

A Smart Investment for Agricultural Byproduct Valorization

For the Tanzanian entrepreneur who transitioned from oil pressing to agricultural waste processing, the Peanut Shell Dryer in Tanzania specifically the RICHI φ1.2×12 rotary dryer has transformed what was once a waste disposal problem into three revenue streams: briquettes, animal bedding, and toll drying services. The machine paid for itself in eight months based on fuel sales alone, and the client now has a diversified business that is not dependent on a single crop or season.

If you are handling peanut shells, coffee husks, cassava waste, or any other high-moisture agricultural residue in Africa, contact RICHI Machinery. We will test your material free of charge, recommend the correct dryer size and flight configuration, and provide remote installation support. You do not need a full processing line to start. A single RICHI rotary dryer can be the foundation of a profitable byproduct business.