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Precautionary method for acidic water storage tank shut-down overhauling ferrous sulfide corrosion product spontaneous combustion accident

A technology for shutting down maintenance and corrosion products, applied in cleaning methods and appliances, chemical instruments and methods, cleaning hollow objects, etc., can solve the problems of low mud-water separation efficiency and poor safety, improve mud-water separation efficiency, avoid tank holding, The effect of shortening the cleaning time

Inactive Publication Date: 2018-01-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is the problem of poor safety and low mud-water separation efficiency in the prior art, and a new method for preventing spontaneous combustion accidents of sulfur-iron corrosion products in acidic water storage tanks is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for preventing spontaneous combustion accidents of ferrosulfide corrosion products during maintenance of an acidic water storage tank, comprising the following steps:

[0016] (1) First, clean and replace the acidic water storage tank with fresh water for no less than 12 hours; pump the cleaned and replaced sewage into other tanks or sewage stripping devices;

[0017] (2) Use a jet pump to stir the sludge and sediment at the bottom of the acidic water storage tank to release the residual hydrogen sulfide in the sludge and sediment at the bottom, and at the same time spray the tank wall and the inside of the tank by spraying at the top Deodorizing and passivating cleaning agent, the deodorizing and passivating cleaning agent is an oxidizing cleaning agent until the concentration of hydrogen sulfide in the acidic water storage tank drops below 100ppm;

[0018] (3) Use a sludge pump to extract the sludge and sediment at the bottom of the acidic water storage tank,...

Embodiment 2

[0022] A method for preventing spontaneous combustion accidents of sulfur-iron corrosion products in acidic water storage tanks, comprising the following steps:.

[0023] (1) First, clean and replace the acidic water storage tank with fresh water for no less than 12 hours; pump the cleaned and replaced sewage into other tanks or sewage stripping devices;

[0024] (2) Use a jet pump to stir the sludge and sediment at the bottom of the acidic water storage tank to release the residual hydrogen sulfide in the sludge and sediment at the bottom, and at the same time spray the tank wall and the inside of the tank by spraying at the top Deodorizing and passivating cleaning agent, the deodorizing and passivating cleaning agent is an oxidizing cleaning agent until the concentration of hydrogen sulfide in the acidic water storage tank drops below 100ppm;

[0025] (3) Use a sludge pump to extract the sludge and sediment at the bottom of the acidic water storage tank, adjust and modify it...

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Abstract

The invention relates to a precautionary method for an acidic water storage tank shut-down overhauling ferrous sulfide corrosion product spontaneous combustion accident. The problems that in the priorart, the safety is poor and the mud and water separation efficiency is low are mainly solved. By adopting the precautionary method for the acidic water storage tank shut-down overhauling ferrous sulfide corrosion product spontaneous combustion accident, fresh water replacement and passivator spraying and cleaning modes are used for replacing steam cleaning, the technical scheme of cleaning passivation of in-tank hydrogen sulfide and tank wall iron sulfides better solves the problem, and the method can be used for precaution of the acidic water storage tank shut-down overhauling ferrous sulfide corrosion product spontaneous combustion accident.

Description

technical field [0001] The invention relates to a method for preventing spontaneous combustion accidents of ferrosulfide corrosion products during maintenance of an acidic water storage tank. Background technique [0002] The acid water tank is mainly used for storage and buffering of sulfur-containing sewage generated by each device. Since acidic water contains a large amount of hydrogen sulfide and sulfur-containing compounds, it is easy to react with metals on the surface of equipment and pipelines to produce sulfur-iron corrosion products. Sulfur iron corrosion products have the phenomenon of spontaneous combustion when exposed to air, which brings safety risks to the maintenance of acidic water tanks. In addition, sulfides in acidic water are poisonous and harmful gases, which are prone to poisoning hazards. Therefore, it is very necessary to clean and passivate the sulfur-iron corrosion products when the acid water tank is shut down for maintenance, and at the same t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B9/08B08B9/093
Inventor 张艳玲兰正贵屈定容刘艳
Owner CHINA PETROLEUM & CHEM CORP
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