3–4 T/H Beet Pulp Drying System in Kenya

Why the Drying Site Is Close to the Beet Processor

Kenya's commercial sugar-beet sector is still small compared with its established sugarcane industry. This project therefore does not assume that large quantities of wet beet pulp are already available throughout Nakuru and the wider Rift Valley. Instead, the feed manufacturer works with an emerging beet-processing source in the cooler Nyandarua highlands, where commercial sugar-beet cultivation and processing have begun to develop.

Pressed beet pulp contains mostly water. Moving several tonnes of wet material to Nakuru before drying would mean paying to transport water. The customer therefore established the thermal drying section near the pulp source and moves the much lighter dried product to its existing feed operation after cooling and storage stabilization.

This arrangement also reduces the time that highly moist pulp remains in uncontrolled storage before preservation.

Three-Pass Rotary Dryer Project Configuration

The 30 kW figure is the mechanical power required to rotate the dryer drum. It is not the thermal power required to evaporate water. Furnace duty, fuel consumption and process-air volume are calculated separately from the actual evaporation load and heat-source efficiency.

The Mass Balance Determines the Dryer Size

Dryer selection starts with dry matter rather than drum dimensions alone. If 4 T/H of pressed beet pulp enters the system at 78% moisture, the material contains only about 0.88 T/H of dry solids. At approximately 11% final moisture, those solids correspond to just under 1 T/H of dried product.

The difference — approximately 3 T/H — is the water that must be evaporated. This is why the project's upper operating point is expressed as approximately 4 T/H wet feed, 3 T/H evaporation and 1 T/H finished product rather than describing all three figures as the same dryer capacity.

If incoming pulp moisture falls closer to 76%, dry-product output increases slightly and the evaporation requirement falls. If wetter pulp arrives, the operator either reduces wet-feed rate or improves upstream mechanical dewatering.

Mechanical Pressing Should Remove Water First

Thermal evaporation is one of the most energy-intensive stages in beet pulp processing. The customer therefore requires the beet-processing partner to supply pressed pulp rather than very dilute pulp directly from extraction.

Mechanical dewatering removes free water without paying the thermal cost of evaporating it. The drying system then handles the remaining bound and retained moisture required to reach approximately 10–12% final moisture.

Incoming moisture is checked routinely. The dryer is not operated at the same 3–4 T/H feed rate regardless of whether the pulp arrives at 72%, 78% or 81% moisture. Each change alters the evaporation load substantially.

Why a Three-Pass Layout Was Selected

The customer had limited space available at the satellite drying site, making a compact drum arrangement attractive. The three-pass structure provides a longer material and hot-air path inside a relatively compact installation footprint.

That does not mean a three-pass dryer is universally superior to a single-pass unit for every beet pulp project. Selection depends on pulp consistency, tendency to form lumps, evaporation demand, available floor area and heat-source design.

For this system, a controlled receiving hopper and metering/dispersing screw prepare the pressed pulp before it enters the drum. This reduces large wet clumps and gives the dryer a more consistent feed, which is especially important for fibrous press cake.

Dryer Temperature Is Adjusted to the Real Moisture Load

The system does not use one permanent 380–450°C inlet-gas setting simply because that range appeared in an initial equipment specification. Gas temperature must be managed together with feed rate, airflow, incoming moisture and exhaust condition.

The control objective is final product moisture and stable feed quality rather than maintaining one temperature number. Operators monitor inlet conditions, exhaust temperature, outlet moisture and product appearance and then adjust fuel input or wet-feed rate accordingly.

The same principle applies to residence time. Drum speed affects material movement, but residence time cannot be specified independently of loading and airflow.

Biomass Heat Reduces Dependence on Liquid Fuel

The customer selected a biomass hot-air furnace because pipeline natural gas is not available at the project site and relying exclusively on diesel would expose the dryer to higher fuel-price volatility. The furnace can use suitable dry agricultural or wood-processing residues that meet the combustion-system specification.

Fuel quality is checked for moisture, ash and particle size before use. Low-density agricultural residues require controlled feeding and combustion-air distribution, while high-moisture fuel can sharply reduce useful heat output.

The project does not claim one fixed biomass consumption per tonne of dried pulp. Actual fuel use depends on evaporation load, fuel calorific value, moisture, furnace efficiency and heat losses.

Final Moisture Is Controlled at Approximately 10–12%

Pressed beet pulp cannot be stored for long periods in the same way as a dry feed ingredient because its high water content creates rapid deterioration risk. Drying to approximately 10–12% moisture changes the handling and storage condition substantially.

The rotary dryer is not operated simply to reach the lowest moisture possible. Overdrying wastes thermal energy and can reduce saleable product mass. The customer instead targets a storage-stable specification suitable for subsequent feed handling.

Moisture verification is performed on the finished material rather than assuming that a particular exhaust temperature automatically means the product has reached 12%.

Cooling Comes Before Storage and Transport

Dried beet pulp leaves the thermal section warm and must be cooled before it is placed into enclosed storage or transported to the main feed mill. Packing or binning hot material can encourage condensation and moisture migration as the product cools.

The existing downstream cooling and conveying section therefore handles approximately 0.8–1.0 T/H of dry product rather than the 3–4 T/H wet-feed rate entering the dryer.

After cooling, the dried pulp can be transported to Nakuru and incorporated into dairy cattle feed formulations or supplied as a separate feed ingredient according to the customer's sales plan.

Dried Beet Pulp Is One Dairy Feed Ingredient

The customer's actual application is dairy cattle feed. Beet pulp provides highly fermentable fiber and can form part of a dairy ration, but it is not a complete feed and the dryer does not determine its inclusion rate.

The feed mill combines dried beet pulp with forage, cereals, protein ingredients, minerals and other components according to the nutrition program. Its role can therefore differ between farms depending on available forage and the rest of the ration.

The project does not claim a fixed increase in milk yield from using dried beet pulp. Feeding response depends on the complete diet, cow production level, dry-matter intake and farm management.

Kenya's Sugar-Beet Supply Is Still an Emerging Constraint

Unlike countries with long-established beet sugar industries, Kenya cannot yet assume year-round large-volume beet pulp availability. The customer therefore sizes this project around confirmed supplier tonnage rather than national sugar-beet production projections.

Raw-material agreements cover campaign volume, expected pressed-pulp moisture and delivery schedule. If commercial beet acreage expands, the plant can evaluate longer operating hours or additional drying capacity from actual wet-pulp availability.

This makes feedstock security just as important as dryer capacity in the investment decision.

Shipping the Drying System through Mombasa

The Beet Pulp Drying System in Kenya is prepared for export from Qingdao, China, in modular sections and enters the country through the Port of Mombasa before inland delivery to the Nyandarua-area drying site.

Before shipment, RICHI reviews the wet-pulp receiving hopper, metering screw, drum foundation, hot-air furnace, fan and duct system, exhaust dust control, dry-product cooler, electrical supply and site layout. Thermal-load calculations are handled separately from the 30 kW mechanical drum drive.

What to Confirm Before Selecting a Beet Pulp Dryer

• confirmed wet beet pulp tonnes available per day and per campaign;
• incoming moisture or measured dry-matter percentage;
• mechanical pressing conditions before the dryer;
• required final moisture and dry-product T/H;
• calculated hourly water evaporation load;
• available furnace fuel and its moisture and calorific value;
• daily operating hours and seasonal supply pattern;
• cooling, storage and transport arrangements after drying.

A 3–4 T/H Beet Pulp Drying System in Kenya

This Beet Pulp Drying System in Kenya project uses one φ1.8×12×3C three-pass rotary dryer with a 30 kW drum drive at a satellite processing site serving a Rift Valley dairy-feed manufacturer. Pressed sugar beet pulp enters at approximately 76–78% moisture and around 3–4 T/H. The system removes approximately 2.2–3.0 T/H of water and produces roughly 0.8–1.0 T/H of dried pulp at approximately 10–12% final moisture.

For another project, RICHI Machinery needs confirmed wet-pulp supply, inlet moisture, dry-matter analysis, final moisture target, heat source, operating schedule and downstream cooling and storage information. These figures determine whether a three-pass dryer of this scale is technically justified far more reliably than selecting equipment from wet tonnage alone.