Ceramic nozzles for circulating and bubbling fluidized beds that resist erosion, heat and plugging.
Hundreds of nozzles carry the fluidizing air into the bed.
When their openings wear or plug, the bed stops behaving like one.
Fluidized bed nozzles resist erosion and plugging when the nozzle head keeps its outlet geometry against hot, abrasive bed material and does not let bed material fall back into the air openings. Blasch casts CFB nozzles, BFB bed nozzles, bubble caps, arrowheads and tuyeres in abrasion resistant silicon carbides, ALTRON, NITRON, InVinCer reaction bonded and OXYTRON, as exact replacements for metal nozzles that wear, corrode or overheat. The ceramic heads are threaded, flanged, welded or bolted through a metal assembly, so they fit the existing air distributor plate.
The air distributor at the bottom of a circulating or bubbling fluidized bed holds the nozzles that lift and mix the bed. Each nozzle sits in the hottest and most abrasive zone of the boiler.
Erosion: sand, ash and fuel particles move at high speed around and into the outlets and wear the heads from outside and inside.
Backflow and plugging: when air flow drops, bed material can run back into worn openings. Plugged nozzles starve their part of the bed and overload their neighbors.
Heat and corrosion: alloy heads oxidize and lose shape at bed temperature, especially with corrosive fuels such as biomass and waste.
Uneven air distribution follows from all three. The result is poor fluidization, hot spots and agglomeration, and in the end an unplanned outage to replace nozzles.
A nozzle head that keeps its outlets lets the plant run to the outage it planned, instead of the one the worn grid forces on it.
Blasch casts all common nozzle types for fluidized beds, in the geometry of the part you run today.
Cap shaped heads with side outlets that spread air sideways and shield the openings from falling bed material.
Pointed heads with directed outlets. In one documented plant, InVinCer arrowheads lasted five times longer than the metal parts they replaced.
Straight and directional nozzles for CFB and BFB grids, for boilers, smelters and refinery reactors.
All four silicon carbides resist abrasion far better than cast or fabricated metal. ALTRON and NITRON balance wear resistance with thermal shock resistance, InVinCer reaction bonded silicon carbide gives a dense wear face, and OXYTRON resists oxidation at temperature. Reaction bonded silicon carbide
Each head can be threaded, flanged, welded or bolted, or combined with a metal assembly that mounts like the original. Blasch replicates the geometry and the attachment of the existing metal nozzle, so the grid itself stays as it is.
The same nozzle families run in smelting and refining, and in gas cooling, NOx and SOx reduction, particulate removal, injection and combustion. Plant builders use the freedom of the casting process to design complex nozzle systems, and single plants use it to replace a worn metal nozzle one for one. Power generation parts
Coal fired units also wear out their burner nozzles, which Blasch casts in the same silicon carbides. Coal nozzle tips
Yes. The new head mounts the way your current nozzle does, so the distributor plate needs no rework.
A head that keeps its outlet geometry keeps its air flow, which is what keeps bed material out. Worn metal outlets are a common cause of plugging.
Bubble caps, arrowheads, tuyeres and straight bed nozzles for circulating and bubbling fluidized beds.
A sample or the dimensions of the current nozzle, the bed temperature, the fuel and the bed material. A drawing is not required.
Send the nozzle type, its dimensions and the bed conditions. A Blasch engineer proposes the grade and the mounting.
