Alternative fuels vary. Their combustion doesn’t have to.

Cement plants need to reduce their dependence on coal while keeping fuel costs under control. RDF/SRF offers a clear economic advantage, but its variable quality can make the burning process harder to manage. Without precise fuel control, kiln operators can end up having to increase coal use or PCI to stabilize combustion, reducing the savings gained through higher substitution rates.

RDF/SRF and other alternative fuels vary widely in quality. Moisture, calorific value and chlorine content shift from load to load, causing temperature swings, inefficient combustion and product inconsistency. These fluctuations increase operator workload and make reliable process control difficult.

An unstable flame puts stress on the entire system. Frequent fluctuations cause ring formation, where deposits build up to drive wear on kiln linings and increase the risk of unplanned shutdowns. Every temperature spike or fuel-related variance increases the cost of maintenance and threatens overall uptime.

Suppliers don’t always provide fuel that matches specifications. And without real-time measurements on delivery, plants have no way to verify quality or push back when loads fall short. Poor visibility at the door leads to greater instability inside the kiln.

Higher substitution rates are central to reducing fossil fuel use and lowering CO₂ emissions. But the carbon benefit depends on stable, efficient combustion. If variable RDF/SRF requires additional coal correction (increased PCI) or creates process inefficiencies, emissions rise and regulatory gains are reduced. That’s why stable combustion is essential to achieving measurable CO₂ reductions.