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Gas phase deactivation method for petrochemical device

A gas-phase passivation, petrochemical device technology, applied in metal material coating process, fuel test, material inspection, etc., can solve the problems of high cost and large consumption

Active Publication Date: 2011-08-17
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 gas-phase passivation method for petrochemical equipment, 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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  • Gas phase deactivation method for petrochemical device
  • Gas phase deactivation method for petrochemical device

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Embodiment Construction

[0081] 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.

[0082] 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 abso...

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Abstract

The invention discloses a gas phase deactivation method for a petrochemical device. The method comprises the following steps of: sequentially opening a tail gas valve, an exhaust valve, a monitoring air inlet valve and a monitoring air outlet valve, and then starting an online gas chromatograph to monitor the concentration of SO2, wherein the SO2 content of the tail gas is high when the gas phasedeactivation process starts, and the volume concentration of the SO2 is reduced to 0.001-0.09 percent after 7 to 19 hours; and finishing the tower reaction when the volume concentration of the SO2 isnot changed in 30 to 60 minutes, finishing the gas phase deactivation, and resetting the valves. Compared with the deactivation method in the prior art, the method has the advantages that: the treatment of waste gas is easy; the gas phase deactivated waste gas can reach discharge standards by simple treatment; the treatment time is short; the cost is low, and the implementation is simple; oxygen rich air is mainly used in the gas phase deactivation, is convenient to use and has low cost; and because of gas phase action, channeling and dead angles are not caused.

Description

technical field [0001] The invention relates to a technical method in the petroleum and petrochemical field, in particular to a gas-phase passivation method for a petrochemical device. Background technique [0002] 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 the full reaction with ferrous sulfide, so as to prevent the oxidation and spontaneous combustion of ferrous sulfide the goal of. [0003] 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. [0004] The metal surface is transformed in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/10G01N33/22
Inventor 王慧欣谢传欣董国胜霍明甲
Owner CHINA PETROLEUM & CHEM CORP
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