The Stack Is Full Of Money
Kiln and furnace efficiency, waste heat recovery and fuel strategy for the hardest sector in industry to abate. Independent engineering, with results verified to IPMVP.
The Hardest Sector To Abate
Process heat dominates this sector's cost base and its carbon account; the numbers explain why.
Sources: Nature Scientific Data, IntechOpen, IOM3, World Bank IFC
Where The Margin Leaks
The pressures we hear from plant managers, process engineers and decarbonisation leads across cement, glass, lime and brick.
The kiln dominates everything
Pyroprocessing takes 93 to 99% of fuel use on a typical cement line, and the glass hot end takes more than 80% of site energy. If a programme does not touch the kiln or the furnace, it does not touch the problem.
ETS exposure compounds every inefficiency
Every wasted gigajoule now costs fuel plus carbon, and free allocation is phasing out from 2026 as CBAM phases in. Measures that looked marginal at fuel-only prices are quietly becoming the best projects on site.
Waste heat leaves the stack unrecovered
Preheater exhaust at 300 to 400 C and clinker cooler vent air routinely leave site unrecovered. Captured properly, these streams can supply up to 30% of a cement plant's own electricity needs.
Alternative fuels raise stability questions
Raising thermal substitution rate changes flame temperature, chlorine loading and bypass requirements. Plants want the fuel cost saving without gambling clinker quality or kiln uptime.
Electric melting and oxy-fuel decisions loom
Furnace rebuilds come once a campaign, and the technology question is now live. Committing without furnace-level data risks locking in the wrong architecture for a decade or more.
Grinding power climbs with product specs
Comminution commonly takes more than 60% of a cement plant's electricity, and finer products push it higher. Mill circuit efficiency is now a board-level number, not a maintenance topic.
What We Engineer In Your Plant
The section worth reading twice: the sub-systems we audit, design and optimise, because this is where the gigajoules actually are.
Kiln and pyroprocessing line
We optimise combustion and excess air, manage kiln shell heat loss and refractory condition, and improve clinker cooler performance across the preheater, precalciner and rotary kiln.
Glass melting furnaces
We assess regenerator and recuperator condition, combustion settings and electric boosting strategy, and model rebuild options including oxy-fuel and hybrid melting.
Waste heat recovery
We map preheater exhaust and cooler vent streams across operating states and engineer recovery to drying, heating or power where the heat balance genuinely allows.
Alternative fuels integration
We engineer thermal substitution rate increases with flame temperature, chlorine loading and bypass implications worked through before the first tonne of SRF is fired.
Grinding and comminution
We benchmark mill circuits in kWh per tonne and evaluate vertical roller mills, high pressure grinding rolls and high efficiency classifiers against measured baselines.
Fans and drives
We rightsize and apply variable speed drives to kiln ID, cooler, combustion air and bag filter fans, where documented retrofits have saved around 5 kWh per tonne.
Compressed air systems
We tackle leak load, pressure set points and zoning on compressed air, including the IS forming machine supply that container glass plants depend on.
Process control for thermal stability
We tighten control loops, O2 trim and operating envelopes so the kiln or furnace holds stable conditions at lower specific heat consumption.
Three Ways To Engage
Each service pillar is angled to plants built around kilns and furnaces.
Energy Audits & Compliance
Thermal audits that map every heat stream by temperature, flow and operating state, plus the ETS, CBAM and CSRD data discipline this sector now lives under. You get a ranked, costed register, not a report that goes in a drawer.
Design & Projects
Waste heat recovery schemes from feasibility through detailed design and commissioning, alternative fuel switching projects, and engineering support for furnace upgrade and rebuild decisions. We design what the audit proved.
Energy Management & Intelligence
Specific energy tracking in GJ per tonne clinker and kWh per tonne cement that survives product mix changes, built on sub-metering and regression baselines. Drift shows up in weeks, not in the annual accounts.
How The Work Gets Done
Every engagement follows the same engineering discipline, whatever the sector.
Audit
Instrumented, engineering-led, and baselined against your production data.
Roadmap
A costed, sequenced register of measures your board can fund in steps.
Delivery
Designed and delivered around production, never in spite of it.
Verify
Savings measured against the baseline and verified to IPMVP.
Proof You Can Measure
Anonymised, measured and verified to IPMVP: how plants like yours turned stack losses into savings.
11%reduction in site thermal energyBuilding materialsHow a European building materials producer cut site thermal energy by 11%
A European building materials producer asked EM3 for a defensible answer on how much of the heat leaving its kiln line was…
7%reduction in specific melting energyContainer glassHow a container glass manufacturer reduced specific melting energy by 7%
Mid-campaign, with a furnace rebuild still years away, a European container glass manufacturer needed its specific melting energy back under control. Combustion…
Regulation As A Roadmap
Carbon and energy regulation hits this sector harder than almost any other. We turn each obligation into a costed engineering roadmap rather than a reporting burden.
EU ETS
A carbon price on every tonne of combustion CO2, with free allocation phasing out from 2026. EM3 builds allowance exposure into project economics so the abatement register is ranked by what each measure is really worth.
CBAM
Cement is among the first six sectors covered by the EU's Carbon Border Adjustment Mechanism. EM3 puts the metering and data discipline in place so embedded emissions figures stand up to scrutiny.
ISO 50001
Demands a live energy management system with defined significant energy uses. We structure SEUs around the kiln, furnace and grinding lines and set EnPIs in GJ per tonne clinker and kWh per tonne cement.
CSRD
Audited sustainability disclosure including energy and emissions. We build the sub-metered data foundations so reported figures survive assurance without a year-end scramble.
ESOS
The UK's mandatory energy audit scheme. We deliver ESOS as a ranked, costed opportunity register for the kiln or furnace line, not a compliance document nobody reads twice.
Industrial emissions permitting
IED permits and BAT conclusions increasingly carry energy efficiency conditions. We align energy projects with permit obligations so one programme answers both.
Talk To The Engineers
Your first conversation is with our commercial team. Delivery is by engineers who have spent their careers around kilns, furnaces and the instrumentation that proves what changed.
Daniele Dominguez
Commercial Director
Senior Energy Engineer, Thermal Processes
Owns kiln and furnace audits, combustion optimisation and the site heat balance behind every recommendation.
Lead Design Engineer, Waste Heat Recovery
Takes recovery schemes from feasibility through detailed design, installation and commissioning.
Energy Management Consultant, Carbon & Reporting
Owns EnPIs, monitoring and targeting, and the ETS, CBAM and CSRD data discipline behind them.
Resources For The Hot End
Practical reading on waste heat, alternative fuels and carbon exposure for cement, glass and building materials plants.
AtlasThe European industrial energy funding atlas
A country-by-country map of the public funding available to industrial sites for energy efficiency and decarbonisation projects across five European…
ArticleWaste heat recovery in hard-to-abate plants: what actually pays back
ArticleWhy your decarbonisation journey needs a roadmap: don’t let short-term decisions derail your green goals
Common questions from cement, glass & building materials teams
What can waste heat realistically be used for?
Drying first: on most cement plants the preheater exhaust already dries raw meal and fuel, so genuine surplus depends on raw meal moisture. After drying, look at heating duties on or near the site, then power generation through steam Rankine or ORC systems, which can supply up to 30% of a cement plant's electricity needs. We map every stream by temperature, flow and operating state before recommending anything, because the ranking changes plant by plant.
Do alternative fuels destabilise the kiln?
Not when the substitution is engineered rather than procured. Higher thermal substitution rates change flame temperature, chlorine loading and bypass requirements, and each needs working through before firing. Leading European plants run above 40 to 50% TSR with stable clinker quality, which shows what disciplined integration can deliver. We treat alternative fuels as a process engineering project: trials, instrumentation and a stability envelope, not just a cheaper fuel contract.
How does ETS exposure change project economics?
It adds a carbon value to every gigajoule of fossil fuel saved, on top of the fuel price. With free allocation phasing out from 2026 as CBAM phases in, that value is rising and increasingly unavoidable. Practically, it shortens paybacks, promotes thermal measures up the ranking and makes waste heat recovery and fuel switching easier to sanction. We model energy and carbon together so the register reflects what each measure is actually worth.
