Ferrous sulfide gas phase passivation method

A ferrous sulfide, gas phase passivation technology, applied in the direction of iron oxide/iron hydroxide, etc., can solve the problems of uneven passivation, high passivation cost, long passivation time, etc., and achieve uniform passivation and long contact time , low cost effect

Active Publication Date: 2014-08-27
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is the problems of higher passivation cost, uneven passivation, longe

Method used

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  • Ferrous sulfide gas phase passivation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] in such as figure 1 The gas-phase passivation of ferrous sulfide is carried out on the device shown, the vacuum pump is connected to the tower body with a φ6 steel pipe, and the ball valve connected to the pipe is used to control the vacuum degree. The heat preservation system consists of electric heating belt, heat preservation cotton and temperature controller. The temperature sensor of the temperature controller is placed on the tower wall. The outer layer of the tower wall is covered with a layer of thermal insulation cotton. The temperature range of electric heating belt is 0~250℃.

[0026]The passivation tower has a length of 1500mm, an inner diameter of 95mm, and a wall thickness of 20mm. There are four hand holes on the side wall with a diameter of 70mm. Four temperature sensors are installed directly opposite the hand holes to record temperature signals. The tower is equipped with a tray, and the generated ferrous sulfide is placed on the tray for passivation...

Embodiment 2

[0049] According to the conditions and steps described in Example 1, only the reaction temperature is 110° C., and the water vapor pressure is 0.1 MPag.

Embodiment 3

[0051] According to the conditions and steps described in Example 1, only the reaction temperature is 170° C., and the water vapor pressure is 0.9 MPag.

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Abstract

The invention relates to a ferrous sulfide gas phase passivation method, which mainly solves the problems of high passivation cost, uneven passivation, long passivation time, and complicated operation in the prior art. The ferrous sulfide gas phase passivation method involved in the invention comprises the steps of: (1) conveying a ferrous sulfide suspension into a passivation tower, discharging the fluid from the passivation tower, and removing water from ferrous sulfide; (2) in a water vapor environment, introducing oxygen-enriched air into the passivation tower and passivating ferrous sulfide; (3) dividing the gas discharged from the passivation tower into at least two ways, making one way of the discharged gas enter sulfur dioxide and hydrogen sulfide content detection equipment after condensation and drying, and making the other way of the discharged gas enter an alkali liquor absorption pot; and (4) analyzing the ferrous sulfide content before and after passivation, the concentration of sulfate ions in the passivated condensate, and the content of sulfur dioxide and hydrogen sulfide in tail gas. The technical scheme well solves the problems and can be used in ferrous sulfide gas phase passivation.

Description

technical field [0001] The invention relates to a 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 industrial methods for preventing spontaneous combustion of ferrous sulfide mainly include: isolation method, cleaning method and passivation method. The isolation method is very effective in online protection, but it is difficult to realize in the process of shutting down for maintenance. The treatment method for ferrous sulfide in petrochemical equipment basically adopts the method of liquid phase passivation, that is, the liquid phase passivation agent...

Claims

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Application Information

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IPC IPC(8): C01G49/02
Inventor 王振刚
Owner CHINA PETROLEUM & CHEM CORP
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