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Chemical Industry

The cracking furnace is the core of ethylene production, and the refractory material is an important factor affecting the service life of the cracking furnace. Among them, the lining and working group of the SRT cracking furnace use refractory materials.

chemical industry

SRT cracking furnace

Refractories for SRT cracking furnace

SRT ethylene cracking furnace

Refractory bricks:

In the internal high temperature area of ​​the cracking furnace, refractory bricks are used to construct the wall and bottom of the furnace.

Refractory castables:

Refractory castables are used to fill and repair small gaps and damaged parts of furnaces.

Refractory fiber:

Used for the insulation layer of the furnace.

Insulation bricks:

In the external area of ​​the pyrolysis furnace, insulation bricks are used to reduce heat conduction and heat loss.

Thermal barrier coating:

The external surfaces of the pyrolysis furnace are coated with a thermal barrier coating. These coatings are usually made of ceramic fibers, refractory cement and other materials, which can provide better heat insulation effect.







Ceramic fiber blanket

Classification temperature  ℃114012601400
GradeXT114XT126-AXT126-BXT140-AXT140-B
Permanent linear change %
℃×24h
≤-3
950
≤-3
1000
≤-3
1100
≤-3
1200
≤-3
1350
Thermal Conductivity W/(m·K)500℃≤0.153
Tensile Strength MPa 25mm thickness>0.04>0.05>0.04>0.06
Bulk density  kg/m364/96/128/160
Al2O3  %≥44≥45≥45≥52≥36
SiO2  %≥52≥52≥54≥46≥48
ZrO2  %////≥15
Fe2O3  %≤1.0≤0.8≤0.2≤0.2≤0.1
Al2O3+SiO2  %≥96≥97≥99≥99
Al2O3+SiO2+ZrO2 %////99
Size3600/7200×610×20/30/50

Refractory plastic

ItemSilicon carbideZirconium Chrome Corundum
NMK4NMK5NMK6NMK7
Al2O3  %///≥80
SiC  %≥40≥60≥70/
Cr2O3  %///≥3
ZrO2  %///≥2
Bulk Density g/cm3 
110℃×24h
≥2.4≥2.5≥2.6≥2.8
Permanent Linear Change %
1000℃×3h
-0.4~0-0.5~0-0.6~0-0.6~0
Cold Crush Strength MPa
1000℃×3h
≥60≥70≥80≥90
Wear resistance at room temperature  cm3
1000℃×3h
≤7≤6≤5≤5
Thermal shock stability cycle 1000℃ water cooling≥30≥35≥40≥30
Plasticity Index %15~55
Plasticity W/(m·K) 1000℃3~55~76~82~3
Maximum service temperature  ℃1400150016001600

High alumina refractory castable

IndexHigh Alumina  Castable
Al2o3 %65
Sio2 %30
Cao %6
Bulk density  g/cm³110℃,24h2.5
1350℃,24h2.6
Cold bending strength MPA110℃,24h6
1350℃,24h7.5
Hot bending strength  MPA110℃,24h45
1350℃,24h60
1350 Burning line rate of change0.2
Mixing water consumption %10-12%
Operating temperature1400

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