Industrial Minerals & Powder Processing calculator
Dryer Energy Cost Calculator
Estimate the thermal energy cost to dry industrial minerals from incoming moisture to target moisture using rotary dryers, flash dryers, or fluid bed dryers. Use it to budget drying cost per ton, compare natural gas versus propane versus other fuel sources, or justify dryer efficiency improvements.
What this calculator does
- Estimate the thermal energy cost to dry industrial minerals from incoming moisture to target moisture using rotary dryers, flash dryers, or fluid bed dryers.
- Use it when a plant manager or process engineer needs to budget drying energy cost per ton, compare fuel sources, or justify dryer upgrades based on energy savings.
- Shows total and per-ton thermal energy cost for drying mineral feed from incoming moisture to target moisture.
Formula used
- Variable drying cost = production tonnage x water removal per ton x energy cost per lb of water removed
- Total dryer energy cost = variable drying cost + fixed dryer operating cost
Inputs explained
- Production tonnage to dry: Enter the tons of wet mineral feed requiring drying during the period (shift, day, week, or month).
- Water removal per ton of feed: Calculate from moisture differential: (incoming % moisture minus target % moisture) x 20 lb per percentage point per ton. Example: 6% to 1% = 100 lb water per ton.
- Energy cost per lb of water removed: Divide fuel cost per MMBtu by approximately 800 (lb water evaporated per MMBtu at typical dryer efficiency). Example: $4/MMBtu / 800 = $0.005/lb.
- Fixed dryer operating cost per period: Add maintenance, labor, burner service, refractory, and other fixed costs allocated to the drying operation for the same period.
How to use the result
- Use for drying cost budgets, fuel source comparisons, dryer efficiency audits, and capital justification for dryer upgrades.
- Actual cost varies with inlet temperature, outlet temperature, dryer efficiency, ambient humidity, feed particle size, feed rate consistency, fuel BTU content, burner condition, seal leakage, and heat losses. Validate thermal design with dryer OEM data or a qualified thermal process engineer.
Common questions
- What information do I need before using the Dryer Energy Cost calculator? You need the tons to be dried, the water removal load per ton (from the moisture differential), your energy cost per pound of water removed (derived from fuel cost per MMBtu and dryer efficiency), and any fixed operating costs.
- What does the result mean? The result estimates the total fuel and operating cost to dry the mineral feed for the period, plus the cost per ton of dried product.
- When is the result only an estimate? Always. Dryer thermal efficiency, ambient conditions, feed consistency, and fuel BTU content all change the actual cost. Use meter readings and fuel invoices for actual cost tracking.
- What decision can I make from the result? Use it to compare fuel sources (natural gas vs. propane vs. coal), justify dryer insulation or seal repairs, set product pricing for dried grades, or evaluate whether pre-screening wet fines reduces total drying cost.
Last reviewed 2026-05-12.