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Method for protecting storage tank safety by using sulfur recovery tail gas

A sulfur recovery and tail gas technology, which is applied in combustion methods, separation methods, chemical instruments and methods, 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. To achieve the effect of low operating cost, comprehensive utilization and low cost

Active Publication Date: 2011-04-20
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

[0016] 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. Use the SCOT tail gas of the sulfur recovery unit as the positive pressure protective gas, and the gas composition is: H 2 S 0.03% (V), COS50μL / L, CS 2 10 μL / L, CO 2 34% (V), H 2 0.6% (V), H 2 O 7.0% (V), the rest is N 2 . The protective gas flow into the tank is 200 Nm 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 0.01~0.05% (V), dimethyl disulfide 20~60mg / m 3 , other components such as COS, CS 2 , CO 2 , H 2 , H 2 O, N 2 It is slightly lower than the intake concentration....

Embodiment 2

[0018] 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. Use the SCOT tail gas of the sulfur recovery unit as the positive pressure protective gas, and the gas composition is: H 2 S 0.03% (V), COS 50μL / L, CS 2 10 μL / L, CO 2 34% (V), H 2 0.6% (V), H 2 O 7.0% (V), the rest is N 2 . The protective gas flow into the tank is 200 Nm 3 / h, the flow rate of positive pressure protection gas discharged from the tank is 100-300 Nm 3 / h, the total hydrocarbon concentration in the exhaust gas is as high as (2~6)×10 5 mg / m 3 , H 2 S 0.01~0.04% (V), dimethyl disulfide 20~60mg / m 3. Exhaust gas is incinerated in the tail gas incinerator of the existing sulfur recovery unit. In the presence of an appropriate amount of fuel gas and air, the temperature of the incineration furnace is 550-650°C, and ...

Embodiment 3

[0020] According to the conditions and methods described in Example 2, the exhaust gas enters the tail gas catalytic incinerator of the existing sulfur recovery device for incineration, and adopts SiO 2 As a supported V / Fe / Ag catalyst, containing V by weight 2 o 5 4.5%, Fe 2 o 3 4.0%, Ag 1.0%, bed space velocity 5000~10000h -1 , the bed temperature is 350-430°C, the SO in the incineration flue gas 2 Less than 0.03% (V), in line with national emission standards.

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PUM

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Abstract

The invention relates to a method for protecting the safety of storage tanks by sulfur recycling tail gas, which comprises the steps: the tail gas of sulfur recycling devices is used as positive pressure protecting gas for sewage water tanks containing sulfur and oil and oil tanks containing sulfur, and the positive pressure protecting gas discharged from the sewage water tanks containing sulfur and oil and the oil tanks containing sulfur is introduced into a low-pressure gas pipe net or into an incinerator to be treated or into an oxidized absorption-sorption device to be treated. The method leads the gas in the tanks not to contain oxygen, 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, guarantees the safe usage of the storage tanks; in addition, the method for protecting the safety of storage tanks by sulfur recycling tail gas has simple process and equipment, safety and environmental protection and low running cost.

Description

technical field [0001] The invention relates to a method for using sulfur to recover tail gas to protect the safety of storage tanks, in particular to a safe and environmentally friendly method for using sulfur-containing oily 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-smel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65D90/44B01D53/00B01D53/48F23G7/07
Inventor 刘忠生齐慧敏王有华
Owner CHINA PETROLEUM & CHEM CORP
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