Circulating Fluidized Bed (CFB)

Circulating fluidized beds (CFBs) are known to be compliant to current emission rate legislation without the capital expenditures of adding selective catalytic reduction (SCR) or flue-gas desulfurization (FGD). These units operate at temperatures not conducive to generating NOx emissions, and 95 percent of SOx emissions can be controlled via additions to the fuel stream. That, combined with the value of being able to constantly source and switch to the lowest-cost fuel stream, allows CFBs to operate more economically than other types of units.

The process involves forced air injected underneath a bed of fuel. During the combustion process, strong drafts are produced that carry combustion products and uncombusted fuel into the unit’s ductwork. A cyclone is used to separate combustion products from the heavier uncombusted fuel and return it to the bed. This process leads to a high conversion rate of fuel and reduces the process waste streams to just airborne fines.

Refractories within a CFB can have vastly different refractory needs. CFBs are known for the abrasive nature of the process, and refractories designed to resist abrasion, impact, and high temperatures are mainstays.

HWI has a long history of providing refractories for CFB reactors. We know these highly abrasive environments call for abrasion-resistant solutions like the gunning mix VERSAGUN® ABR PLUS, the NIKE 60 AR brick, and the silicon carbide–based gunning mix ECLIPSE-80 GR PLUS. HWI can not only provide solutions like these but also solutions for any other part of a CFB unit.

Products
Circulating Fluidized Bed (CFB)

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Product SDS
‘SAIRSET A wet, air-setting, fireclay mortar
AUREX® 75 An alumina-chrome brick with 75% chrome English
AUREX® 95 P An alumina-chrome with with 90% chrome and 3% phosphorous pentoxide English
CLIPPER® DP A super duty fireclay brick
CORAL® BP A burned, phosphate bonded 80% alumina brick
CORAL® PLASTIC 28-82 ADTECH® An 82% alumina, phosphate bonded refractory plastic
ECLIPSE-60 P ADTECH® A 60% silicon carbide, phosphate bonded refractory plastic
ECLIPSE-80 GR PLUS An 80% silicon carbide, cement bonded gunning mix
ECLIPSE-80 P ADTECH® An 80% silicon carbide, phosphate bonded refractory plastic
EXCELERATE ABR PLUS A high alumina, phosphate bonded ramming mix with excellent abrasion resistance
EXPRESS® THERMAX® ADTECH® A self flowing, cement bonded, vitreous silica castable designed for thermal shock resistance
GREENCAST®-94 PLUS A 94% alumina, low silica castable
GREENGUN®-85 P PLUS An 85% alumina, phosphate bonded gunning plastic
GREENLITE® CASTABLE 22 PLUS A 2200°F rated lightweight castable with fast dryout English
GREENLITE®-45-L GR ON-LINE® A 2500°F rated lightweight gunning mix
GREENPATCH-421 A 53% alumina, wet, air setting thick patching mortar
INSWOOL® PUMPABLE 2300°F Ceramic Fiber Pumpable Material - formulated for pumping with special equipment.
INSWOOL®-HP BLANKET A 2300°F rated, alumina silica ceramic fiber blanket
KALA® A 50% alumina brick
KALA® HPC CHECKERS A 50% alumina brick
KAST-O-LITE® 19 L PLUS A 1900°F rated lightweight castable
KAST-O-LITE® 22 PLUS A 2200°F rated lightweight castable
KS-4V GR PLUS A fireclay based, conventional cement gunning mix
KS-4V PLUS A fireclay based, conventional cement castable
LO-ABRADE® PLUS A 2600oF dense, abrasion-resistant castable
MAGSHOT® A magnesia based, phosphate bonded gunning mix
NIKE 60 AR A 60% alumina, andalusite containing brick
ON-LINE® 57A A 60% alumina, rapid turn-around, low-cement castable
PLASTECH® 50P STD A 50% alumina, phosphate bonded refractory plastic
PLASTECH® 70P STD A 70% alumina, phosphate bonded plastic refractory
PLASTECH® 85P STD An 85% alumina, phosphate bonded plastic refractory
PLASTECH® 90P STD A 90% alumina, phosphate bonded refractory plastic
PLASTECH® RUBY® An alumina-chromium, phosphate bonded refractory plastic
RESERV 50
SERV® 95 An alumina-chrome brick with 92% chrome
SHOT-TECH® 45 LI A fireclay based, low-cement shotcrete mix
SHOT-TECH® 60 A 60% alumina, low-cement shotcrete mix
SUPER HYBOND® PLUS A high-strength, air-setting, super-duty, plastic refractory
TUFSHOT® LI PLUS A fireclay based, conventional-cement, low iron gunning mix
VERSAFLOW® 45 PLUS A fireclay based, low-cement castable
VERSAFLOW® 80 C PLUS An 80% alumina, coarse aggregate, low-cement castable
VERSAFLOW® THERMAX PLUS A vitreous silica, low-cement castable designed for thermal shock resistance English
VERSAGUN® ABR PLUS A 60% alumina, low-cement gunning mix designed for abrasion resistance
VERSAGUN® PH PLUS A fireclay, low-cement cunning mix English
VERSAGUN® THERMAX® ADTECH® A vitreous silica based gun mix which displays excellent properties and outstanding resistance to thermal shock for temperatures below 2000°F.

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