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Activated carbon desorption method of activated carbon tank in benzene vapor recovery unit

A recovery device and activated carbon technology, applied in separation methods, chemical instruments and methods, combustible gas purification, etc., can solve problems such as difficult desorption, reduce the average vacuum degree, improve the circulation processing capacity, and reduce the time required for startup Effect

Active Publication Date: 2017-06-13
CHINA PETROLEUM & CHEM CORP QINGDAO RES INST OF SAFETY ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem that desorption is not easy in the low temperature environment in the prior art, and a new activated carbon desorption method for the activated carbon tank in the benzene vapor recovery device is provided

Method used

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  • Activated carbon desorption method of activated carbon tank in benzene vapor recovery unit

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] With design processing capacity of 300Nm 3 / h benzene vapor recovery device as an example, the adsorption tank is a pressure tank with a diameter of 1.6 meters, and 2 tons of activated carbon is installed inside.

[0019] (1) The air purge inlet pipeline and the steam heat tracing pipeline on the top of the activated carbon tank 4 are heat exchanged through the heat exchanger 1, and the temperature of the purge inlet air can be read by the temperature indicator 3 in the upper space of the activated carbon tank 4. The heat transfer rate of the heat exchanger was controlled to control the purge air temperature at 55°C.

[0020] (2) After the activated carbon tank 4 is adsorbed and saturated, its activated carbon bed is regenerated by the vacuum provided by the vacuum pump 5. When the pressure in the tank drops below 5.0kPa, open the purge solenoid valve 2 of the air inlet on the top of the activated carbon tank, and introduce the The heated clean air enters the activated...

Embodiment 2

[0025] According to the conditions and steps described in Example 1, the temperature of the purge air is only controlled at 40°C by controlling the heat transfer rate of the heat exchanger. After the purge solenoid valve 2 is opened for 1.5 minutes, the purge solenoid valve 2 is closed to make the inside of the tank The vacuum degree drops further and is maintained for 1.5 minutes before opening the purge solenoid valve 2.

[0026] The comparison test shows that after the warming air is introduced, the time required for the desorption of the activated carbon tank is reduced from 15 minutes to 12 minutes, and at the same time the desorption of the activated carbon tank is complete, and the adsorption capacity of benzene increases by about 5%.

Embodiment 3

[0028] According to the conditions and steps described in the embodiment, the temperature of the purge air is controlled at 60°C only by controlling the heat transfer rate of the heat exchanger. After the purge solenoid valve 2 is opened for 1 minute, the purge solenoid valve 2 is closed to make the vacuum in the tank Further down, and maintain 1.5min and then open the purge solenoid valve 2.

[0029] The comparison test shows that after the warming air is introduced, the time required for the desorption of the activated carbon tank is reduced from 15 minutes to 10.5 minutes, and at the same time the desorption of the activated carbon tank is complete, and the adsorption capacity of benzene increases by about 12%.

[0030] Obviously, by introducing heated air for purging, the temperature of the bed layer in the activated carbon tank during desorption and desorption can be increased, benzene crystals at low temperature can be melted, and the desorption speed of benzene molecules...

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Abstract

The invention relates to an activated carbon desorption method of an activated carbon canister in a benzene vapor recovery device. The method mainly solves the problem that activated carbon is prone to desorption at low temperature in the prior art. According to the technical scheme, the activated carbon desorption method comprises the steps that after adsorption of the activated carbon canister in the benzene vapor recovery device is saturate, an activated carbon bed layer is regenerated on the vacuum condition; after the pressure in the activated carbon canister is reduced to 5.0 kPa, air is blown into a heat exchanger to exchange heat with vapor to reach 40-60 DEG C and then enters the activated carbon bed layer in the activated carbon canister for replacement, and more benzene molecules are desorbed from the activated carbon bed layer and enter the follow-up treating process through a vacuum pump and a compressor. The activated carbon desorption method can be used for desorption of the activated carbon canister in the benzene vapor recovery device.

Description

technical field [0001] The invention relates to an activated carbon desorption method of an activated carbon tank in a benzene vapor recovery device. Background technique [0002] Benzene is an important petrochemical basic raw material, but it is highly toxic and a carcinogen. In refining and chemical enterprises, benzene materials will produce a large amount of evaporation loss during storage and transportation such as loading and unloading. The benzene content in the steam can reach hundreds of grams per cubic meter. If the steam produced by evaporation is directly discharged into the atmosphere, serious damage will occur. Environmental pollution and human health risks. [0003] GB16297-1996 "Comprehensive Emission Standard of Air Pollutants" stipulates that the emission limit value of benzene is 12mg / m 3 . To this end, numerous benzene vapor recovery devices have been built, the principles of which include adsorption, absorption, membrane, condensation or a combinatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/04B01J20/34
Inventor 魏新明邹兵姜素霞肖寒高翔李明哲马明孙晓英
Owner CHINA PETROLEUM & CHEM CORP QINGDAO RES INST OF SAFETY ENG
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