Ferrous sulfide gas-phase passivation method

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

Active Publication Date: 2011-04-27
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a ferrous sulfide gas phase passivation method, 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

[0082] Gas-phase passivation is a method of controlling oxidation of ferrous sulfide with water vapor as a carrier using oxidizing gas in order to prevent spontaneous combustion and explosion accidents of ferrous sulfide inside the petrochemical device before maintenance.

[0083] 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, and part of the sulfur dioxide gas generated by passivation is carried out of the tower by the steam and then passed through the lye It can be discharged directly after condensation and absorption.

[0084] like figure 1 As sh...

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Abstract

The invention discloses a ferrous sulfide gas-phase passivation method, comprising the steps of monitoring, feeding air, passivating, sealing and discharging, wherein the passivating is implemented as follows: vapor carrying oxygen enriched air enter a container for carrying out gas phase passivation on ferrous sulfide. The vapor is water vapor, the pressure of the water vapor is 0.1-0.9 MPa, and the oxygen enriched air contains 21-50 percent of oxygen by volume. Compared with the ferrous sulfide liquid-phase passivation method, the ferrous sulfide gas-phase passivation method has low cost, is easy to implement, mainly adopts oxygen enriched air which is convenient to use and has low cost for gas phase passivation, ensures uniform ferrous sulfide passivation, is free from channeling phenomenon and dead corners due to gas-phase action and boasts of easy treatment of waste gas which is produced in ferrous sulfide gas-phase passivation and can reach the emission standard after being treated simply, and has short treatment time.

Description

technical field [0001] The invention relates to the technical field of a metal sulfide treatment method, in particular to a metal surface ferrous sulfide gas phase passivation method. Background technique [0002] Ferrous sulfide is the corrosion product of sulfur in petroleum and its derivatives to petrochemical equipment. During the maintenance of petrochemical equipment, spontaneous combustion or explosion accidents often occur due to the oxidation of ferrous sulfide. Therefore, ferrous sulfide must be passivated before maintenance of petrochemical equipment. or cleaning treatment. [0003] At present, the treatment methods for ferrous sulfide in petrochemical plants all adopt the method of liquid phase passivation, that is, the liquid phase passivation agent is circulated in the device to realize sufficient reaction with ferrous sulfide, so that ferrous sulfide can be converted into more stable The oxides of iron so as to achieve the purpose of preventing the spontaneou...

Claims

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Application Information

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Patent Type & Authority Applications(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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