Equipment for distillery plants
Combustion-air heating for spent-wash and slop-fired boilers, where flue gas fouls a conventional air heater.
Distillery boilers that fire spent wash or slop see sticky, acidic, ash-laden flue gas. A tubular or regenerative air heater sitting in that gas path corrodes and plugs at the cold end. Grandeh’s answer on these plants is a steam coil air preheater (SCAPH) ahead of the main heater.
Why SCAPH is specified here
Saturated steam flows inside G-type finned tubes. Combustion air crosses the fins and picks up heat before it reaches the furnace or the main air preheater. Warmer air at start-up and low load keeps the cold-end metal of the downstream heater above the acid dew point more of the time. The steam side stays out of the flue gas, so the fouling stream does not have to pass through the coil itself.
A recent lot of these coils went to a process-sector boiler programme. The distillery SCAPH dispatch describes the duty: finned coils for fouling-prone flue gas, fabricated with IBR-aligned pressure-part practice at Aurangabad.
What to send with an enquiry
- Air flow and the inlet and required outlet temperatures
- Allowable air-side pressure drop
- Steam pressure, temperature and condensate return conditions
- Duct size and whether the coil is horizontal or vertical
- Fuel notes — spent wash, slop, biomass — and any inspection agency
Package and field-erected steam boilers for the same plants are fabricated to the steam demand and the fuel the distillery actually fires.