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Gas-phase passivation system for petrochemical device

A technology of gas phase passivation and petrochemical equipment, applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of high cost and large consumption

Active Publication Date: 2014-02-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a gas-phase passivation system for petrochemical plants, which can effectively overcome the following defects in the liquid-phase passivation in the prior art: (1) large dosage and high cost

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Embodiment Construction

[0083] Gas-phase passivation is a method of controlling oxidation of ferrous sulfide with water vapor as the carrier and using oxidizing gas to prevent people who open the device from spontaneous combustion and explosion accidents caused by ferrous sulfide inside before the petrochemical device is overhauled.

[0084] The gas-phase passivation method of ferrous sulfide in the petrochemical plant of the present invention is carried out in the distillation tower by low-pressure steam (0.3-0.4Mpa) carrying oxygen-enriched air with a certain oxygen content (21%-35%) in the middle and later stages of the distillation tower Gas-phase passivation of ferrous sulfide, the heat released by passivation is absorbed by the steam with large heat capacity and will not cause heat accumulation in the tower, part of the sulfur dioxide gas generated by passivation is carried out of the tower by the steam and passed through the ammonia liquid It can be discharged directly after condensation and ab...

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Abstract

The invention discloses a gas-phase passivation system for a petrochemical device. The gas-phase passivation system comprises a gas-phase passivation device, a tail gas treatment device and a data analysis device, wherein the tail gas treatment device is connected with the gas-phase passivation device and is used for treating harmful gases generated in a passivation process; the tail gas treatment device further comprises a lye tank in which 10 percent sodium hydroxide solution is accommodated, a tail gas valve and an exhausting valve; the data analysis device is connected with the gas-phase passivation device and is used for detecting data of combustible gases before gas-phase passivation and linearly detecting the concentration of sulfur dioxide (SO2) generated by passivation in a gas-phase passivation process; and the data analysis device further comprises a gas drying apparatus, a gas chromatograph, a metering machine, an air inlet monitoring valve and an air outlet monitoring valve. By the passivation system, waste gases are easy to treat, and the waste gases generated by gas-phase passivation can meet the discharge standard after being treated simply.

Description

technical field [0001] The invention relates to the technical field of a processing system for metal products, in particular to a gas phase passivation system for the metal surface of a petrochemical device. Background technique [0002] The metal surface is transformed into a state that is not easily oxidized, and the method of delaying the corrosion rate of the metal is called passivation. If the corrosion product generated by the metal due to the action of the medium has a dense structure, a thin film (often invisible) is formed and tightly covered on the surface of the metal, which changes the surface state of the metal and greatly increases the electrode potential of the metal. The positive direction jumps and becomes a passive state of corrosion resistance. For example, when Fe→Fe++, the standard potential is -0.44V, and it jumps to +0.5~1V after passivation, and shows the performance of corrosion-resistant noble metals. This layer of film is called passivation film. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/14
Inventor 王慧欣谢传欣张宏哲霍明甲
Owner CHINA PETROLEUM & CHEM CORP
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