Method for protecting manganese-chromium spinel film of cracking furnace tube against burning
A cracking furnace tube and spinel technology, applied in cracking, petroleum industry, non-catalytic thermal cracking, etc., can solve problems such as manganese-chromium spinel film shedding, reduce cracking furnace tube operating cycle, etc.
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Embodiment 1
[0038]In this example, the industrial cracking furnace is a CRT-Ⅳ type cracking furnace, and the raw material for cracking is naphtha, with an annual output of 60,000 tons of ethylene. A cracking furnace tube with a manganese-chromium spinel film is used, and the raw material for cracking naphtha is The operating cycle of the cracking furnace is about 200 days. After 200 days of operation, the furnace was shut down and burned. The burning process used the original cracking furnace's own burning program (see the above table 1 for details), and the initial COT was 800°C. However, due to the accumulation of a large amount of coke due to the long-term operation, after half an hour of coking, when the online analysis shows that the carbon dioxide concentration in the coke tail gas exceeds 8 volume%, the manual control is performed quickly to reduce the air volume by 10 volume% of the current air volume, and The amount of water vapor is increased by 25% by volume of the current amou...
Embodiment 2
[0040] In this example, the industrial cracking furnace is a CRT-Ⅳ type cracking furnace, and the raw material for cracking is naphtha, with an annual output of 60,000 tons of ethylene. A cracking furnace tube with a manganese-chromium spinel film is used, and the raw material for cracking naphtha is The operating cycle of the cracking furnace is about 200 days. After 200 days of operation, the furnace was shut down and burned. The burning process used the original cracking furnace's own burning program (see the above table 1 for details), and the initial COT was 800°C. However, due to the accumulation of a large amount of coke due to the long-term operation, after half an hour of coking, when the online analysis shows that the oxygen concentration in the coke cleaning tail gas is less than 12% by volume, it is quickly manually controlled to reduce the air volume by 5% by volume of the current air volume, and The amount of water vapor is increased by 50% by volume of the curre...
Embodiment 3
[0042] In this example, the industrial cracking furnace is a CRT-Ⅳ type cracking furnace, and the raw material for cracking is naphtha, with an annual output of 60,000 tons of ethylene. A cracking furnace tube with a manganese-chromium spinel film is used, and the raw material for cracking naphtha is The operating cycle of the cracking furnace is about 200 days. After 200 days of operation, the furnace was shut down and burned. The burning process used the original cracking furnace's own burning program (see the above table 1 for details), and the initial COT was 800°C. However, due to the accumulation of a large amount of coke due to long-term operation, after half an hour of coking, on-line analysis shows that when the temperature of the outer wall of the cracking furnace tube is higher than 1100 ° C, the manual control is performed quickly to reduce the air volume by 20% by volume of the current air volume, and make the water The steam volume increased by 10% by volume of t...
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