Zhengzhou Rongsheng

ELECTRICITY INDUSTRY

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

Zhengzhou Rongsheng

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.

Refractory Bricks For Electricity Industry

Wear-resistant Refractory Brick

According to the operation condition of circulating fluidized bed boiler, the wear-resistant refractory brick is made from corundum and super grde bauxite as main raw materials, adding composite binder to combine the matrix and particles closely, pressed under high pressure, and then sintered at high temperature. The brick is featured with high crushing strength, good wear resistance, stable volume and good thermal shock resistance at medium and high temperature.

Zhengzhou Rongsheng
Fireclay Brick

Fireclay brick is made from clinker clay by mixing, forming, drying, sintering and matching characterized by good resistance to corrosion and abrasion, good thermal shock resistance, good spelling resistance, high mechanical strength, good volume stability under high temperature. Fireclay bricks are used for the fail flue of CFB boiler.

Zhengzhou Rongsheng

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.

Item Specification
Bulk Density, g/cm³ 110℃ ×24h ≥2.75
Permanent Linear Change On Heating , % 1100℃ ×3h ±0.4
CCS , MPa 110℃ ×24h ≥100
1100℃ ×3h ≥120
CMOR , MPa 110℃ ×24h ≥10
1100℃ ×3h ≥18
Thermal Shock Resistance,Cycle 1000℃    Water Quenching ≥20
Wear-resistance Index,cc ASTM C-704 <6
Chemical Composition , % Al2O3 ≥75
SiO2 <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 cartridge of circulating fluidized bed boiler, which are the worst wear parts.

Brand RSNM-A
Item  Specification
Bulk Density , g/cm³ 110℃ ×24h ≥2.8
Permanent Linear Change On Heating , % 1100℃ ×3h ±0.4
CCS , MPa 110℃ ×24h ≥100
1100℃ ×3h ≥120
MOR , MPa 110℃ ×24h ≥17
1100℃ ×3h ≥20
Thermal Shock Resistance,Cycle 1000℃ Water Quenching ≥25
Wear-resistance Index,cc ASTM C-704 ≤5
Chemical Composition,% Al2O3 ≥80
SiO2 <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 the traditional refractory plastic,the wear resistant plastic refractories are featured with good plastic ability, long shelf life,high strength and good wear resistance. The strength of the material increases with the increasing temperature due to the adoption of composite binder. The wear-resistant plastic refractories,using fused corundum,mullite 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 furnace can be directly start if necessary.

Brand RSNMKS-A
Item  Specification
Bulk Density , g/cm³ 110℃ ×24h ≥2.7
CCS , MPa 110℃ ×24h ≥80
1100℃ ×3h ≥100
MOR , MPa 110℃ ×24h ≥12
1100℃ ×3h ≥14
Chemical Composition , %  Al2O3 ≥80
Maximum Service Temperature , ℃ 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 etc.

 

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 resistant 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.

Brand RSKRZ-1
Item Specification
Bulk Density,g/cm³ 110℃ ×24h ≥2.8
CCS,MPa 110℃ ×24h ≥100
1100℃ ×3h ≥120
MOR,MPa 110℃ ×24h ≥17
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

The fireclay castables, made from clay clinker and aluminate cement as main raw materials, are featured with high refractoriness and good thermal shock resistance.

Brand RSNTJ-2
Item Specification
Bulk Density,g/cm³ 110℃ ×24h 2.2-2.4
CCS,MPa 110℃ ×24h ≥40
1100℃ ×3h ≥50
MOR,MPa 110℃ ×24h ≥5
1100℃ ×3h ≥6
Thermal Shock Resistance,Cycle 1000℃ Water Quenching ≥20
Maximum Service Temperature,℃ 1400
Service Area Ignition duct, mixing chamber, coal economizer beam
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