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Method for improving coking resistance of alloys and alloy material

An anti-coking and alloying technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve problems such as complex burning process, easy corrosion of furnace tubes, and large corrosion of quenching boilers, and achieve simplified coke cleaning process, extend the operating cycle, and improve the effect of anti-coking performance

Active Publication Date: 2019-04-23
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, the compound coke-cleaning accelerator used in it has strong oxidative properties, and long-term use will cause greater corrosion to the quenching boiler. Moreover, the additional introduction of the compound coke-cleaning accelerator makes the coking process more complicated, and K + Easy to corrode furnace tube

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  • Method for improving coking resistance of alloys and alloy material
  • Method for improving coking resistance of alloys and alloy material
  • Method for improving coking resistance of alloys and alloy material

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Embodiment approach

[0041] According to a preferred embodiment of the present invention, the trace element is Y, and the content of Y is 0.17-0.19wt%.

[0042] The alloy used in the present invention can be obtained by conventional methods, as long as its composition is controlled within the above range. For example, the preparation method of the alloy used in the present invention may include: smelting the alloy raw material, cooling the alloy to obtain the alloy, and if the surface roughness is not within the aforementioned range of the present invention, processing it by additional machining. Wherein, the composition of the alloy raw material is such that the obtained alloy is the aforementioned alloy. The method of selecting the composition of the alloy raw material so as to obtain the alloy with the expected composition and surface roughness is well known to those skilled in the art and will not be described in detail herein.

[0043] In the present invention, the method further includes ca...

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Abstract

The invention relates to the field of alloy materials, and discloses a method for improving coking resistance of alloys and an alloy material. The method comprises the following steps of performing surface treatment on the alloys of which the surface roughness is 0.2-10 [mu]m with mixed gas of sulfide-containing steam, steam and reducing gas, wherein based on the total weight of the alloys, the alloys contain 76.4-97.5wt% of Fe, 1.5-20wt% of Cr, 0.3-0.8wt% of Mn, 0.4-2wt% of Si, 0.1-0.2wt% of C, 0.2-0.6wt% of Mo, and 0-1wt% of trace elements, wherein the trace elements are one or more of Al, Nb, Ti, W and rare-earth elements. The invention also discloses the alloy material which is treated by the method. Through the adoption of the method disclosed by the invention, the modified alloy material has notable improved coking resistance.

Description

technical field [0001] The invention relates to the field of alloy materials, in particular to a method for improving the anti-coking performance of alloys and alloy materials. Background technique [0002] In the ethylene cracking unit, the quench boiler is responsible for rapidly cooling the cracked gas to terminate the secondary reaction and using the heat of the cracked gas to generate high-pressure steam. Coking in heat exchange tubes is a prominent problem in the operation of quenching boilers. In particular, when the cracking raw material is heavy oil (heavy AGO, VGO, etc.), the coking of the quench boiler is more serious, and constitutes the main restriction factor of the cracking unit's operating cycle. In order to ensure the smooth flow of logistics, the cracking furnace has to be shut down irregularly to clean the quench boiler (mechanical or hydraulic coke cleaning). This not only affects the operating rate of the cracking furnace, but also shortens the service...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/06C22C38/22C22C38/34C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28
CPCC22C38/005C22C38/02C22C38/04C22C38/06C22C38/22C22C38/26C22C38/28C22C38/34C23C8/06
Inventor 王申祥王红霞郏景省王国清
Owner CHINA PETROLEUM & CHEM CORP