Flue Gas Plume Elimination and Waste Heat Recovery with Cross-Flow Exchangers

Boilers, dryers and process stacks often discharge warm, moisture-heavy flue gas. Besides wasting heat, that plume condenses into a visible white smoke that neighbours notice and regulators scrutinise. A cross-flow air-to-air heat exchanger attacks both problems at once: it recovers sensible heat and, combined with a condensing section, limits the plume.

Two jobs in one core

The cross-flow plate recovers heat from the flue gas to pre-heat combustion or process air, improving overall efficiency. When the exhaust is cooled below its dew point, part of the latent heat is also captured and the saturated plume is reduced, cutting the white plume at the stack.

Plant benefits

• Higher boiler / process efficiency: recovered sensible heat lowers fuel use.
• Plume control: cooling and partial condensation shrink the visible stack plume.
• Compact footprint: cross-flow geometry fits tight retrofit spaces beside existing stacks.

Design pointers

Wet, corrosive flue gas calls for the right plate material and drainage for condensate. We size the core from flue-gas temperature, flow and target recovery, and can pair it with a condensing stage where plume limits are tight.

Cut both heat loss and the visible plume from your stack. Contact us for a cross-flow recovery design.