Indústria química

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. Entre eles, the lining and working group of the SRT cracking furnace use refractory materials.

SRT cracking furnace

Refractories for SRT cracking furnace

tijolos refratários:

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.

Tijolos de isolamento:

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.

Manta de fibra cerâmica

Temperatura de classificação ℃	1140	1260		1400
Nota	XT114	XT126-A	XT126-B	XT140-A	XT140-B
Permanent linear change % ℃×24h	≤-3 950	≤-3 1000	≤-3 1100	≤-3 1200	≤-3 1350
Condutividade Térmica C/(m·K)500℃	≤0,153
Resistência à tração MPa 25 mm de espessura	＞0,04	＞0,05		＞0,04	＞0,06
Densidade a granel kg/m³	64/96/128/160
al₂O₃ %	≥44	≥45	≥45	≥52	≥36
SiO₂ %	≥52	≥52	≥54	≥46	≥48
ZrO₂ %	/	/	/	/	≥15
Fé₂O₃ %	≤1,0	≤0,8	≤0,2	≤0,2	≤0,1
al₂O₃+SiO₂ %	≥96	≥97	≥99	≥99	≥
al₂O₃+SiO₂+ZrO₂ %	/	/	/	/	99
Tamanho	3600/7200×610 ×20/30/50

Refractory plastic

Item	Carboneto de silício			Zircônio Cromo Corindo
Item	NMK4	NMK5	NMK6	NMK7
Al2O3 %	/	/	/	≥80
SiC %	≥40	≥60	≥70	/
Cr2O3 %	/	/	/	≥3
ZrO2 %	/	/	/	≥2
Densidade aparente g/cm3 110℃×24h	≥2,4	≥2,5	≥2,6	≥2,8
Mudança Linear Permanente % 1000℃×3h	-0.4~0	-0.5~0	-0.6~0	-0.6~0
Resistência ao esmagamento a frio MPa 1000℃×3h	≥60	≥70	≥80	≥90
Resistência ao desgaste à temperatura ambiente cm3 1000℃×3h	≤7	≤6	≤5	≤5
Ciclo de estabilidade de choque térmico 1000 ℃ resfriamento a água	≥30	≥35	≥40	≥30
Índice de Plasticidade %	15~55
Plasticidade c/(m·K) 1000℃	3~5	5~7	6~8	2~3
Temperatura máxima de serviço ℃	1400	1500	1600	1600

High alumina refractory castable

Índice		High Alumina Castable
Al2o3 %		65
Sio2 %		30
Cao %		6
Bulk density g/cm³	110℃，24h	2.5
	1350℃，24h	2.6
Cold bending strength MPA	110℃，24h	6
	1350℃，24h	7.5
Hot bending strength MPA	110℃，24h	45
	1350℃，24h	60
1350 Burning line rate of change		0.2
Mixing water consumption %		10-12%
Temperatura de operação		1400