Refractory Boiler Bed Materials CFBC

The Refractory boiler Bed Material is manufactured from Fresh refractory fire clay and not from pre-used fire bricks. Hence it is virgin, pure and fresh from the factory. It does not carry the impurities like the conventional bed material. The Raw material Pure Fire Clay Refractory Material has been directly source from Neyveli Lignite Corporation Limited (NLC) is a “Nirvana” Government of India Enterprise, hence the superior quality Bed material with excellent features and characteristics resulting in higher efficiency and cost savings.

Salient features

Sri Renga Refractory Bed Material has many special characteristics that make it a perfect material for obtaining smooth and perfect fluidization in FBC & CFBC Boilers with high economy of operations.

  • Material free from fine particles
  • Precise particle size distribution
  • Excellent material for obtaining fluidized action
  • Excellent chemical purity
  • High initial deformation temperature
  • Optimal coal consumption
  • Iron free bed material
  • Perfectly controlled density
  • Low Alkali contentsPerfectly controlled density
  • Low down time & maintenance cost

Fire clay Boiler Bed Material

Quality

First Quality Material

CHEMICAL ANALYSIS

Silica as SiO2

58%

Alumina as Al2O3

38.15%

Alkalis

Less than 1%

Iron as Fe₂O₃

0.35%

PHYSICAL PROPERTIES

Initial Deformation Temperature

1400°C

Size Distribution

Weight fraction

Bulk Density

1100 kg/m

PARTICLE SIZE

Maximum Particle Size

0.5mm

Minimum Particle Size

0.2mm

COMPARISION STATEMENT

USED BED MATERIAL

FIRE CLAY (Virgin) BED MATERIAL

Raw material used is crushed / used scrap refractory materials moisture content 10% to 15%

Raw material used is fire clay.

High impurities of active silica

No impurities

Clinker formation due to impurities melting at 900°C

No Clinker formation

Fluidization extremely difficult due high bulk density

Perfect fluidization even at low pressure due perfect bulk density.

High fuel consumption

Low fuel consumption

High absorption

Bed Material absorbs the heat from the fuel and functions as perfect media.

I.D.T < 1300°C

I.D.T. 1400°C

Poor efficiency and high maintenance cost – No savings

High efficiency and very low maintenance costs – High savings of over 35 % . No corrosion of the boiler bed coil tubes.

COMPARATIVE MATERIAL SPECIFICATIONS

CRUSHED REFRACTORY BED MATERIAL

FIRE CLAY (Virgin) AFBC & CFBC BED MATERIAL

PHYSICAL PROPERTIES

Bulk Density 1100-1200 kg /m²

1050-1100 kg/m²

Initial deformation Temperature < 1200°C

>1400°C

Size Distribution Weight fraction

Weight fraction

Max. Particle Size 0.850 mm

2.36 mm

Min. Particle Size 0.250 mm

0.85 mm

CHEMICAL PROPERTIES

Alumina (Al203) 30% to 40%

38.15%

Silica (Si02)  50% to 60%

58%

Alkalis  > 5%

< 1%

Iron   5%

0.35%