How to Size a Pellet Line from Daily Production Targets

Define the Daily Target and Measurement Boundary

State the target as acceptable finished pellets at one agreed point in the process. For a bagged product this may be the final packing measurement; a bulk project can use its confirmed final acceptable-product measurement point. The same boundary must be used for daily quantity and running output rate.

Material entering the line, pellets leaving the mill and final accepted product are different quantities. Fines returning for another pass do not create additional finished output. Treat rejected or reworked material according to the agreed accounting method, counting accepted product once at the final boundary.

A target in tonnes per day should also state what constitutes a production day and which product specification must be met. In this guide, one tonne (t) is 1,000 kg.

Information and Definitions

Qd

Daily target of acceptable finished pellets, t/day.

Hs

Planned schedulable time each day, h/day.

f

Time utilization: actual operating hours divided by planned schedulable hours, with 0 < f ≤ 1.

Hr

Actual operating time used for planning, h/day.

qr

Required average acceptable finished-output rate during operation, t/h, at the same boundary as Qd.

Use positive daily output and operating time. Enter the utilization factor as a decimal: 90% becomes 0.90. For a proposed line, f is a stated planning assumption unless supported by relevant operating records.

Here, f adjusts time only. It does not combine speed and quality losses into a complete overall equipment effectiveness (OEE) measure. The required qr is already defined as acceptable finished output; do not apply the same quality loss again. Vorne’s OEE factor definitions distinguish availability, performance and quality, which helps explain this boundary. This guide does not assign a TCPEL OEE or utilization value.

Calculate Operating Hours and Required Output Rate

Check the planned daily quantity with the inverse relationship:

The units close as (t/day) ÷ (h/day) = t/h. The output rate is the average that must be achieved during the defined operating hours. If output varies while the line runs, that variation must be reflected in the average over those hours.

Worked Planning Example: 25 Tonnes per Day

The following are hypothetical planning scenarios, not customer cases or equipment test results. Each uses Qd = 25 t/day and Hs = 20 h/day. Only the assumed time-utilization factor changes.

The displayed approximate values are rounded to two decimal places. Keep adequate precision in the planning calculation. For example, treating the rounded 1.56 t/h as an exact achieved rate gives 1.56 × 16 = 24.96 t/day, below 25 t/day. Rounding down cannot be used to promise the original target.

The 90% and 80% factors are scenario inputs, not industry standards or measured TCPEL utilization. The 100% case assumes the full scheduled period is operating time; it is not a recommendation or promise of uninterrupted operation.

As a separate check, a hypothetical line actually producing acceptable finished product at 1.5 t/h for 16 effective hours produces 24 t/day. It does not meet a 25 t/day target. This example refers to a whole-line measurement and is not linked to any TCPEL model.

Turn the Calculation into a Selection Requirement

Use the calculated rate to describe what the project needs, then ask whether the proposed equipment combination can meet it under the stated conditions. A result of approximately 1.39 t/h does not prove that a machine labelled 1.5 t/h will achieve the daily target.

Confirm raw material type and condition, moisture, pellet diameter and other finished-product requirements, operating hours and the final acceptance method. Review relevant material tests or project evidence and the ability of preparation, drying where needed, feeding, pelletizing, cooling, screening and final handling to work together.

Compare stage capacities only after aligning their material and measurement bases. Do not infer output by scaling motor kW, or apply a universal capacity allowance. Required equipment and any project allowance depend on the application and the evidence supporting the proposed configuration.

Prepare a Customer Input Sheet

Copy the following headings into your project enquiry and fill in what is known. Identify estimates separately from measured records.

Keep Material Balance Separate from Time Planning

These equations translate a final daily target into a running output requirement. They do not calculate how much wet raw material must enter the plant or how much water a dryer must remove. Those questions require material and moisture information as well as the relevant loss streams.

For drying calculations, use the published dryer water evaporation mass-balance guide. Keep the resulting wet-feed, dried-material and evaporation quantities separate from the acceptable finished-pellet rate used here. No universal conversion-loss percentage is assumed in this planning method.

Related Equipment and Knowledge

Review TCPEL pellet production line configurations and vertical ring die wood pellet machines when discussing a biomass project. Where drying is part of the scope, review TCPEL rotary dryers alongside the material-balance requirements.

Return to Pellet Production Line Design knowledge for related project-planning guides. Equipment confirmation requires the actual material and agreed acceptance conditions.