Ljungstrom Air heater
Ljungstrom Air heater
(OP)
The sootblowers on the ljungstrom air preheaters are located on the gas side and blow in the opposite direction of the flue gas.My question is why couldn't we place the sootblowers on the air side and blow the heater in the same direction as the fd fan discharge into the secondary air duct and reburning the carbon buildup in the furnace? It would be like a second carbon reinjection system.Any thoughts on this idea?





RE: Ljungstrom Air heater
1) The amount of carbon-rich ash involved in air heater accumulations is very small compared to the amount that can be recovered from the precipitator or baghouse.
2) The particle sizes involved are not primarily very fine, so they are not likely to be effectively consumed by another trip through the furnace.
Unfortunately, this does seem to be a way to increase crud accumulations in the combustion air ducts.
RE: Ljungstrom Air heater
RE: Ljungstrom Air heater
Also remember that the rotor deflects with the heat, don't run the gear too close to the hot end of the pin rack rail! (3/8" gap between the gear and the cold side of the rail ought to do it)
RE: Ljungstrom Air heater
RE: Ljungstrom Air heater
Blowing the deposits loose is one thing, but being able to transport them all the way back to the furnace through the burners in another.
Look in the ductwork down stream of the APH and ask yourself if you want your windboxes looking like that.
rmw
RE: Ljungstrom Air heater
for example 28,5 VIT 88
or 32 H 63 and so on and so on.
There must be any system. please explain
RE: Ljungstrom Air heater