Method for inhibiting hydrocarbons steam cracking furnace from coking

A cracking furnace and steam technology, applied in cracking, non-catalytic thermal cracking, petroleum industry, etc., can solve problems such as maintenance difficulties, post-system operation difficulties, furnace shutdown and coking, etc. effect, effect of suppressing coking

Active Publication Date: 2008-10-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carburizing causes the furnace tube to creep and rupture, which greatly shortens the service life of the furnace tube
[0011] Existing methods for suppressing coking in the prior art have the following disadvantages: 1) affect the downstream system and make the operation of the latter system difficult; ethylene production is reduced; 4) processing and maintenance are difficult and costly; 5) the carburizing of cracking furnace tubes cannot be effectively improved; 6) the effect of inhibiting coking and carburizing is not ideal, etc.
[0013] However, only setting enhanced heat transfer furnace tubes such as twisted sheet tubes in the radiant section of the ethylene cracking furnace has limitations. The operating cycle of the furnace, but there is still coking between the enhanced heat transfer components such as twisted sheets and the inner wall of the furnace tube. After a period of operation, the cracking furnace will have to be shut down due to severe coking

Method used

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  • Method for inhibiting hydrocarbons steam cracking furnace from coking
  • Method for inhibiting hydrocarbons steam cracking furnace from coking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1 and embodiment 2 are the result that industrial cracking furnace is processed.

[0051] Example 1

[0052] The device is a 60,000 tons / year ethylene SRT-IV (HC) industrial cracking furnace, which is divided into six groups of feed materials, and three quenching boilers are connected in parallel. In the furnace tube of the cracking furnace radiant section, twisted tubes are arranged in the form of mutual intervals. , the twisted sheet is twisted 180°, and the distance between two adjacent twisted sheet tubes is 15 pitches. SiO 2 The neutral silica sol whose mass concentration is 20% and pH is 6.5 to 7.5 is diluted with water to be an aqueous solution of silica sol with a mass concentration of pure oxide of 0.5%. ~850°C, under the operating pressure of 0.4Mpa, inject the diluted silica sol aqueous solution into the cracking furnace with the carrier gas steam (20kg / h), the injection amount is 4.0kg / h, and inject The time is 3 hours; then during the operat...

Embodiment 2

[0054] The device is a 30,000 tons / year ethylene GK-V cracking furnace, which is divided into four groups for feeding, and there are two quenching boilers. In the furnace tube of the radiant section of the cracking furnace, twisted sheet tubes are arranged in the form of mutual intervals, the twisted sheets are twisted by 180 °, and the distance between two adjacent twisted sheets is 20 pitches; the solid content is 20%, SiO 2 / Al 2 o 3 =8, PH is that the aluminum silicate sol of 3~4 is diluted with water to be the SiO that oxide mass concentration is 0.8% 2 -Al 2 o 3 Aqueous sol solution, in which SiO 2 : Al 2 o 3 =8: 1 (molar ratio), during the hot standby after the cracking furnace burnt, the outlet temperature of the cracking furnace is 700 ~ 850 ° C, under the operating pressure of 0.3Mpa, the diluted SiO 2 -Al 2 o 3The sol aqueous solution is injected into the cracking furnace from the spanning section of the cracking furnace under the companionship of the carri...

Embodiment 3

[0059] Simulate the SRT-III type cracking furnace, adopt the method of the present invention, add 3 sections of twisted sheet tubes in the furnace tube of the radiant section, and when the outlet temperature of the cracking furnace is 800 ° C, the TiO 2 The titanium sol with a mass concentration of 30% is diluted with water to be a pure oxide with a mass concentration of 0.5% TiO 2 The sol aqueous solution is injected from the spanning section of the cracking furnace, the injection rate is 200g / h, and the injection time is 1 hour; then when the cracking furnace outlet temperature is 840°C for naphtha cracking, the mass concentration is 0.3% ethyl sulfide Phosphorus-naphtha injection is continuously injected into the simulated cracking furnace from the spanning section of the cracking furnace, the injection amount is 16g / h, and the atomic molar ratio of sulfur to phosphorus is S:P=2:1. The physical properties of naphtha are: distillation range 48~211℃, specific gravity D 15.6 ...

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Abstract

The invention relates to a method for suppressing coking of hydrocarbon steam cracking furnaces, which comprises the following steps: preprocessing the hydrocarbon steam cracking furnace by using a sol composition selected from at least one of Si sol, Al sol and Ti sol during heat reserve period of the cracking furnace, and continuously feeding a liquid coking suppresser into the cracking furnace during oil injecting operation period of the cracking furnace, wherein at least one segment of heat transfer enhancement pipe is arranged in the furnace pipe of radiation section of the cracking furnace. The method of the invention can suppress heterogeneous catalysis coking and gas-phase free radical coking, and the tube walls can be scoured intensely by the materials under action of the heat transfer enhancement pipe to further sweep away the softened coke rapidly, thus reducing the possibility and the quantity of coke deposited on the tube walls, effectively suppressing coking of the cracking furnace, prolonging the service life and the operation cycle of the cracking furnace and improving the economic benefit of an ethylene plant.

Description

technical field [0001] The invention relates to a method for suppressing coking in a hydrocarbon steam cracking furnace. Background technique [0002] In the pyrolysis ethylene production plant, the cracking furnace is the most critical core equipment, and about 60% of the energy consumption of ethylene production is consumed in the cracking furnace. The cracking furnace tube is the component with the highest operating temperature in the ethylene production device. The cracking reaction of hydrocarbons is carried out in the furnace tube. Due to the secondary reactions such as polymerization and condensation, it is inevitable to generate coke on the inner wall of the cracking furnace tube and the inner wall of the quenching boiler tube. dirt. Coking increases the thermal resistance of the tube wall, reduces the heat transfer coefficient, increases the wall temperature and causes local overheating; coking increases the energy consumption of the pyrolysis process, reduces the ...

Claims

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Application Information

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IPC IPC(8): C10G9/16
Inventor 陈硕王红霞戴伟张兆斌吴庆凤
Owner CHINA PETROLEUM & CHEM CORP
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