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Carbon Hub → Measures → Combustion air preheating
Reduction measure

Combustion air preheating

Preheating burner air with flue gas (recuperator/regenerator) returns heat directly into combustion — standard on furnaces, underused on mid-size boilers.

Size it for your plant →Carbon bill calculator
The numbers

Cost, effect, payback

MetricValueNote
Abatement cost≈€5–30/t CO2
Addresses+2–5%of relevant emissions
Typical payback2–4 yr
Carbon value at full price€77.4/t avoidedEUA 11 Jun 2026
How it works

Mechanism & sizing

Every 20 °C of air preheat ≈ 1% fuel. On furnaces, regenerative burners reach 50%+ of flue-heat recovery. Watch NOx — preheat raises flame temperature; modern low-NOx burners co-engineer the two.

Inzonex removable modular insulation on industrial equipment
Cut the tonnes at the source

Hot industrial equipment? Cut the heat loss.

Boilers, kilns, heat exchangers, valves and steam lines lose energy continuously. Inzonex makes patented (UK GB2508992.1) removable modular insulation — snap-fastened covers engineered per temperature tier, not generic off-the-shelf jackets:

  • Up to 90% less heat loss from insulated surfaces
  • Surface temperature ≤45 °C — touch-safe for workers (EN ISO 13732-1)
  • 6× faster maintenance access than fixed cut-and-weld lagging — unclips and refits in minutes, no destruction
  • Inspectable — comes off to check for corrosion under insulation, then refits like-new (generic jackets often don't survive removal)
  • Typical payback under 2 years (some 9–11 months)
See Inzonex process-equipment insulation →Run the savings study
Where it applies

Industries where combustion air preheating earns first

Glass
≈0.4–0.7 t CO2/t glass
Ceramics & bricks
≈0.2–0.45 t CO2/t
Steel — BF-BOF (integrated)
≈1.9 t CO2/t steel
Aluminium
≈1.5–1.7 t CO2/t Al direct from smelting
Oil refining
≈0.2–0.3 t CO2/t throughput
Petrochemicals
≈1 t CO2/t high-value chemicals
FAQ

Combustion air preheating, answered

Recuperator vs regenerator?
Recuperator = continuous exchanger (simpler); regenerator = cycling heat storage (higher recovery, furnace-scale).
What's the saving?
2–5% on boilers, far more on high-temp furnaces — regenerative burner retrofits commonly cut 15–30% of furnace fuel.
Why isn't it everywhere?
Space, NOx and burner compatibility — engineering, not physics. High-temp processes should always price it.
How this page is built: heat-loss figures follow ASTM C680 / ISO 12241 (the method behind our public calculators); facility emissions from Climate TRACE & EU ETS verified data across 30,000+ industrial sites; the 2026–2034 schedule is Regulation (EU) 2023/956, not a forecast. Published by Inzonex — manufacturer of modular removable insulation (UK Patent GB2508992.1). Spotted an error? Tell us — we correct on evidence.
Source: Inzonex Carbon Hub — inzonex.co.uk/carbon · prices dated as shown on each figure · schedule per Regulation (EU) 2023/956 · indicative analytics, not compliance advice.