化学工業

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.

SRT cracking furnace

Refractories for SRT cracking furnace

耐火レンガ:

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

耐火物キャスタブル:

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

リフラクトリーファイバー:

Used for the insulation layer of the furnace.

断熱レンガ:

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.

セラミックファイバーブランケット

分類温度 ℃	1140	1260		1400
学年	XT114	XT126-A	XT126-B	XT140-A	XT140-B
永続的な線形変化 % ℃×24h	≤-3 950	≤-3 1000	≤-3 1100	≤-3 1200	≤-3 1350
熱伝導率(m・K)500℃	≤0.153
引張強さ MPa 25mm厚	＞0.04	＞0.05		＞0.04	＞0.06
かさ密度 kg/m³	64/96/128/160
アル₂○₃ %	≥44	≥45	≥45	≥52	≥36
SiO₂ %	≥52	≥52	≥54	≥46	≥48
ZrO₂ %	/	/	/	/	≥15
鉄₂○₃ %	≤1.0	≤0.8	≤0.2	≤0.2	≤0.1
アル₂○₃+SiO₂ %	≥96	97以上	≥99	≥99	≥
アル₂○₃+SiO₂+ZrO₂ %	/	/	/	/	99
サイズ	3600/7200×610×20/30/50

Refractory plastic

アイテム	炭化ケイ素			ジルコニウムクロムコランダム
アイテム	NMK4	NMK5	NMK6	NMK7
Al2O3 %	/	/	/	80以上
SiC %	40以上	60以上	70以上	/
Cr2O3 %	/	/	/	≥3
ZrO2 %	/	/	/	≧2
かさ密度 g/cm3 110℃×24h	≧2.4	≧2.5	≧2.6	≥2.8
永続的な線形変化 % 1000℃×3h	-0.4~0	-0.5~0	-0.6~0	-0.6~0
冷間圧壊強さ MPa 1000℃×3h	60以上	70以上	80以上	90以上
Wear resistance at room temperature cm3 1000℃×3h	≤7	≤6	≤5	≤5
Thermal shock stability cycle 1000℃ water cooling	30以上	≥35	40以上	30以上
Plasticity Index %	15~55
Plasticity W/(m・K) 1000℃	3~5	5~7	6~8	2~3
Maximum service temperature ℃	1400	1500	1600	1600

High alumina refractory castable

索引		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%
動作温度		1400