Power Industry Refractory

The working environment of CFB boiler is high speed fluidized particles abrasion and impact, chemical reaction and corrosion, frequent thermal exchange. So CFB boiler lining refractory have high mechanical strength, excellent abrasion resistance, good corrosion resistance, good thermal shock resistance and so on.

Refractories Conformation Scheme for CFB Boiler

Refractories for CFB Boiler System

Boiler Combustion Chamber

RSNM-B Castables(Dense phase zone, sparse phase zone, boiler roof and etc.)RSNMKS Plastic Castables(Fluidized section of dense phase zone)

Air Separation

RSNM-A Castables or RSNM-75 Wear-resistant Bricks(Used on straight part and cone-shaped part of cyclone tube , gateway, refeeder etc.)

Economizer

RSZGN-42 Refractory Bricks
RSNM-75 Wear-resistant Bricks
RSNM-A Dense Castables
RSQZ -0.7 Light Weight Castables
RSQZ -0.3/0.6 Light Weight Insulating Products
RSNT-2 Castables(Beam of economizer)
RSXWT-100 Refractory Fiber Blanket

Ignition Air Flue、Cold Air Chamber

RSJZL -1 Castables
RSNT-2 Castables

The Tail Flue

RSNM-B Castables
RSQZBW -650/1000 Light Weight Insulating Products
RSZGN-42 Refractory Bricks

Unshaped Refractory Materials

Unshaped refractory is most important refractory used in CFB boiler, it accounts for 70%~80% of the total amount. Low cement castable, ultra low cement abrasion resistant castable and no cement wearing resistant castable are usually used in circulating fluidized bed boiler.

Wear-resistant Castables

The wear resistant castables, made from fused corundum, super grade bauxite, sillimanite, alumina powder and silicon powder as raw materials, are featured with convenient construction, good wear esistance, good spalling resistance, and high strength at early and mid-high temperature period, which overcome the disadvantages of traditional castables.

আইটেম		স্পেসিফিকেশন
Bulk Density, g/cm³	110℃ ×24h	≥2.75
Permanent Linear Change On Heating , %	1100℃ ×3h	±0.4
CCS , এমপিএ	110℃ ×24h	≥100
CCS , এমপিএ	1100℃ ×3h	≥120
CMOR , এমপিএ	110℃ ×24h	≥10
CMOR , এমপিএ	1100℃ ×3h	≥18
Thermal Shock Resistance，Cycle	1000℃ Water Quenching	≥20
Thermal Shock Resistance， Cycle	ASTM C-704	＜6
Wear-resistance Index, cc	আল₂ও₃	≥75
Wear-resistance Index, cc	সিও₂	＜18
Maximum Service Temperature,℃		1600
Service Area	Dense phase area and transition area of combustion chamber, furnace bottom, cyclone cylinder outlet mixing chamber.

Steel Fiber Reinforced Wear-resistant Castables

The castables are produced by adding some silicon carbide, mullite, and steel fiber to enhance the tensile property, strength, and thermal shock resistance on the basis of the technology of optimized wear resistance castables. It is used in cutting direction entrance of cyclone separator and “target area” on the cartridge of circulating fluidized bed boiler, which are the worst wear parts.

ব্র্যান্ড		Bulk Density, g/cm³
আইটেম		স্পেসিফিকেশন
Permanent Linear Change On Heating, %	110℃ ×24h	≥2.8
CCS, এমপিএ	1100℃ ×3h	±0.4
MOR, এমপিএ	110℃ ×24h	≥100
MOR, এমপিএ	1100℃ ×3h	≥120
Thermal Shock Resistance， Cycle	110℃ ×24h	≥17
Thermal Shock Resistance， Cycle	1100℃ ×3h	≥20
Wear-resistance Index, cc	1000℃ Water Quenching	≥25
Horizontal flue at furnace outlet, straight part and cone-shaped part of separator,entry and exit, refeeder and dipleg etc.	ASTM C-704	≤5
রাসায়নিক রচনা,%	আল₂ও₃	≥80
রাসায়নিক রচনা,%	সিও₂	＜11
Maximum Service Temperature,℃		1600
Service Area	Horizontal flue at furnace outlet, straight part and cone-shaped part of separator, entry and exit, refeeder and dipleg etc.

Wear-resistant Plastic Refractories

Compared with traditional refractory plastic, the wear-resistant plastic refractories are featured with good plastic ability, long shelf life, অনেক শক্তিশালী,h and good wear resistance. The strength of the material increases with increasing temperature due to the adoption of composite binder. The wear-resistant plastic refractories, using fused corundum, mullite,e and super grade bauxite as main raw materials, the addition of Guangxi white clay ensures that the refractory plastic can have high plasticity, enhance the crushing strength and wear resistance, especially suitable for repairing CFB boilers and the overall construction of wear-resistant lining. Refractory plastic can be processed into non-baking materials, then the furnace can be started directly start if necessary.

ব্র্যান্ড		RSNMKS-A
আইটেম		স্পেসিফিকেশন
CCS, এমপিএ	110℃ ×24h	≥2.7
MOR, এমপিএ	110℃ ×24h	≥80
MOR, এমপিএ	1100℃ ×3h	≥100
MOR , এমপিএ	110℃ ×24h	≥12
MOR , এমপিএ	1100℃ ×3h	≥14
রাসায়নিক রচনা, %	Maximum Service Temperature, ℃	≥80
Wear resistant parts, such as dense phase area, overheating screen, separator target area, horizontal flue etc.		1600
Wear-resistance Index,cc	ASTM C-704	≤6
Service Area	Wear resistant parts, such as dense phase area, overheating screen, separator target area, horizontal flue, ইত্যাদি.

Thermal Shock Resistant Castables

Most CFB furnaces are ignited under the bed. The ignition temperature is high, and the temperature rises rapidly after ignition. The oil gun will be turned off after the boiler reaches 650 degrees, and the temperature will drop to 150 degrees instantaneously. Therefore, thermal shock resistance and high refractoriness are required, especially in the air chamber, igniter, and water-cooled air chamber. Thermal shock resistant castable is the best choice for these areas.

ব্র্যান্ড		RSKRZ-1
আইটেম		স্পেসিফিকেশন
Bulk Density，g/cm³	110℃ ×24h	≥2.8
Igniter, ignition air flow, water cooling chamber	110℃ ×24h	≥100
Igniter, ignition air flow, water cooling chamber	1100℃ ×3h	≥120
MOR， এমপিএ	110℃ ×24h	≥17
MOR， এমপিএ	1100℃ ×3h	≥20
Thermal Shock Resistance， Cycle	1000℃ Water Quenching	≥25
Maximum Service Temperature，℃		1600
Service Area	Igniter, ignition air flue, water cooling chamber

Fireclay Castables

ব্র্যান্ড		RSNTJ-2
আইটেম		স্পেসিফিকেশন
Bulk Density，g/cm³	110℃ ×24h	2.2-2.4
CCS，এমপিএ	110℃ ×24h	≥40
CCS，এমপিএ	1100℃ ×3h	≥50
CCS， এমপিএ	110℃ ×24h	≥5
CCS， এমপিএ	1100℃ ×3h	≥6
MOR， এমপিএ	1000℃ Water Quenching	≥20
Maximum Service Temperature，℃		1400
Service Area	Ignition duct, mixing chamber, coal economizer beam