Method for protecting storage tank by using flue gas

A flue gas and storage tank technology, applied in chemical instruments and methods, separation methods, containers, etc., can solve problems such as the safe use of sulfur-containing oily sewage tanks or sulfur-containing oil tanks, and the effective removal of hydrocarbons. Achieve the effect of low operating cost, comprehensive utilization, simple and reliable equipment

Active Publication Date: 2009-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to use a special absorbent, and does not effectively remove the hydrocarbons in the exhaust gas, and does not consider the safe use of sulfur-containing oily sewage tanks or sulfur-containing oil tanks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A company has an acid water (sulphur-containing and ammonia-containing sewage) storage tank. According to the operating conditions, the maximum amount of "small breath" is 30Nm 3 / h, its maximum feed rate is 70Nm 3 / h, the maximum output rate is 40Nm 3 / h.

[0024] Use the desulfurized exhaust gas from the tail gas incinerator of the sulfur recovery unit as the protective gas for the storage tank. Sodium carbonate liquid phase desulfurization method is used for desulfurization. The composition of flue gas after purification is: SO 2 12 μL / L, O 2 1.8% (V), CO 2 7% (V), a small amount of water vapor, the rest is N 2 . The protective gas flow into the tank is 200Nm 3 / h, the flow rate of positive pressure protection gas discharged from the tank is 130~300Nm 3 / h, the content of benzene and toluene in the exhaust gas is as high as (0.5~3.0)×10 4 mg / m 3 , the total hydrocarbon concentration is as high as (0.5~5.0)×10 5 mg / m 3 , H 2 S 0.005~0.04% (V), dimethyl ...

Embodiment 2

[0026] A company has a delayed coking sulfur-containing sewage storage tank. According to the operating conditions, the maximum amount of "small breath" is 50Nm 3 / h, the maximum feed rate is 50Nm 3 / h, the maximum output rate is 50Nm 3 / h.

[0027] The purified flue gas from the catalytic cracking regenerator is used as positive pressure protection gas. The flue gas purification method is a wet desulfurization method, and the desulfurization agent is an aqueous solution of sodium hydroxide. The composition of flue gas after purification is: SO 2 8 μL / L, CO 2 1.5% (V), CO 11% (V), O 2 0.6% (V), a small amount of water vapor, the rest is N 2 .

[0028] The protective gas flow into the tank is 200Nm 3 / h, the flow rate of positive pressure protection gas discharged from the tank is 100~300Nm 3 / h, the total hydrocarbon concentration in the exhaust gas is as high as (2~6)×10 5 mg / m 3 , H 2 S 0.005~0.03% (V), dimethyl disulfide 20~60mg / m 3 . The exhaust gas is inc...

Embodiment 3

[0030] According to the conditions and methods described in Example 2, the protective gas uses waste gas from sewage treatment plant to catalytically oxidize the flue gas, and the flue gas is cooled to remove water vapor and form CO 2 1.2% (V), O 2 0.5% (V), a small amount of water vapor, the rest is N 2 .

[0031] The exhaust gas of the protective gas is circulated back to the catalytic oxidation device, and the exhaust gas after treatment meets the national emission standards.

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PUM

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Abstract

The invention relates to a method for protecting storage tanks by purifying flue gas, which uses the purifying treated flue gas as positive pressure protecting gas for sewage water tanks containing sulfur and oil and oil tanks containing sulfur to lead gas in the tanks to contain trace oxygen or not to contain oxygen, and avoids the sewage water tanks and oil tanks from generating self-combustion explosion phenomena caused by the oxidation of ferrous sulfide when in normal use; the positive pressure protecting gas discharged from the sewage water tanks containing sulfur and oil and the oil tanks containing sulfur is introduced into an incinerator to be treated or into an oxidized absorption-sorption device to be treated, and the purified gas reaching standards can be discharged. The method for protecting the storage tanks by purifying flue gas has simple process and equipment, safety and environmental protection and low running cost.

Description

technical field [0001] The invention relates to a safe and environment-friendly use method for sewage tanks and oil tanks, in particular to a safe and environment-friendly use method for sulfur-containing and oil-containing sewage tanks and sulfur-containing oil tanks in petroleum refining enterprises and some petrochemical enterprises. Background technique [0002] In petroleum refining enterprises and some petrochemical enterprises, it is necessary to use sulfur-containing oily sewage tanks and sulfur-containing oil tanks to store sewage and oil products. The sulfur-containing oily sewage or oil products in the tank, as well as the sulfur-containing oil-containing gas in the space above the liquid surface, contact with the metal tank to form ferrous sulfide, and an oil film adheres to it. Under normal circumstances, due to the phenomenon of "big breathing" and "small breathing", sulfur-containing oily sewage tanks and sulfur-containing oil tanks will discharge foul-smellin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65D90/44B01D53/34
Inventor 齐慧敏刘忠生
Owner CHINA PETROLEUM & CHEM CORP
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