Pyrolysis furnace tube for cracking petroleum hydrocarbon

A petroleum hydrocarbon and furnace tube technology, used in the petroleum industry, cracking, catalytic cracking and other directions, can solve the problems of increased coking, reduced furnace tube life, no high temperature furnace tube surface coating, etc., to achieve the effect of improving yield

Active Publication Date: 2009-07-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of cracking furnace tube is mainly composed of Cr and Ni. During the application process, the transition metal Ni in the tube is called the catalyst in the early stage of coking, which will cause the aggravation of coking, and the process of coking will also cause the

Method used

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  • Pyrolysis furnace tube for cracking petroleum hydrocarbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A chromium-nickel alloy tube with an inner diameter of 14mm is selected, and the inner surface of the chromium-nickel alloy tube is first cleaned with a cleaning agent, then washed with distilled water and then dried. Mix the catalytically active component lanthanum nitrate with the binder at a mass ratio of 1:5 to prepare a suspension and inject it into the chromium-nickel alloy tube, fill the tube and stay there for several hours. Then slowly release the suspension, and finally coat the chromium-nickel alloy tube with a layer of coating, place the coated chromium-nickel alloy tube in a heating furnace, raise the temperature to 750°C at a certain heating rate and keep it for several hours, and then naturally Down to room temperature, so that the catalytically active component is coated on the inner surface of the furnace tube, the thickness of the infiltrated layer is about 0.3 μm, and this chromium-nickel alloy tube is made into the radiant section furnace tube of the ...

Embodiment 2

[0034]Potassium aluminate, a catalytically active component, is infiltrated into the inner surface of a chromium-nickel alloy tube with an inner diameter of 14 mm by dialysis, and the thickness of the infiltrated layer is about 0.3 μm. This chromium-nickel alloy tube is made into a small laboratory-use Simulate the furnace tube of the radiant section of the cracking furnace, and at the same time make the chromium-nickel alloy tube that has not been treated in this way into a small furnace tube of the radiant section of the simulated cracking furnace for laboratory use. Naphtha is used as the cracking raw material, and the COT is Under the condition of 825°C, the two furnace tubes were compared and tested, and the results are listed in Table 3:

[0035] table 3

[0036] Target product yield wt% hydrogen methane Vinyl Propylene Butadiene Ordinary tube 0.87 12.80 24.37 12.03 3.15 Furnace tube of the present invention 0.89 11.90 26.70 14.50 4...

Embodiment 3

[0038] Potassium oxide, an anti-coking component, is infiltrated into the inner surface of a chromium-nickel alloy tube with an inner diameter of 14 mm by dialysis, and the thickness of the infiltrated layer is about 0.5 μm. The chromium-nickel alloy tube is made into a small laboratory-use Simulate the furnace tube of the radiant section of the cracking furnace, and at the same time make the chromium-nickel alloy tube that has not been treated in this way into a small furnace tube of the radiant section of the simulated cracking furnace for laboratory use. Naphtha is used as the cracking raw material, and the COT is Under the condition of 825°C, the two kinds of furnace tubes were subjected to a comparative test to measure the amount of coking, and the results are listed in Table 4. The cracking experiment was carried out in the furnace tube of the present invention, which has better anti-coking performance than the existing ordinary tubes.

[0039] Table 4

[0040] ...

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Abstract

The invention provides a cracking furnace tube for cracking petroleum hydrocarbon. The furnace tube contains active components for performing catalytic cracking reaction on the petroleum hydrocarbon and has catalytic cracking activity. The components of potassium aluminate, calcium vanadate, alkaline earth metal, transition metal oxide, silicon-aluminum zeolite and the like which have catalytic activities, and/or the components of alkali metal and the like with coking resistance, are added or adhered to the inner side or the surface of the tube, or are added directly in the process of manufacturing the tube by the methods of coating, infiltration, sintering, plasma spraying and the like so as to obtain the tube which is provided with an inner surface coating, or contains the components with catalytic activities in the whole tube from the inside to the outside, and/or contains the components with coking resistance. Using the furnace tube, the prior ethene device is not necessary to be changed at all, only the furnace tube which has the catalytic function or the furnace tube which is in the cracking furnace is processed, thus the industrialization can be achieved quite easily in theprior cracking device.

Description

technical field [0001] The invention relates to a cracking furnace tube, in particular to a furnace tube for producing low carbon number olefins by cracking petroleum hydrocarbons. Background technique [0002] At present, the most common method of cracking petroleum hydrocarbons to produce lower olefins such as ethylene, propylene and butadiene is steam cracking. According to statistics, currently about 99% of ethylene and more than 50% of propylene in the world are produced by this method. Since the production of steam cracking method is currently operated under very harsh conditions, for example, the final temperature of the furnace tube in the radiant section of the cracking furnace reaches or exceeds 1125°C, and the residence time of materials in the furnace tube in the radiant section is shortened to 0.2s or even shorter. Therefore, at the current technical level, the possibility of further increase in the yield of lower olefins such as ethylene, propylene and butadie...

Claims

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Application Information

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IPC IPC(8): C10G11/00
Inventor 王国清戴伟杨元一陈硕张兆斌张利军
Owner CHINA PETROLEUM & CHEM CORP
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