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Method for treating asphalt gas efficiently and harmlessly

A technology for harmless treatment of asphalt fume, applied in chemical instruments and methods, separation methods, and separation of dispersed particles, etc., can solve the problems of excessive discharge of pollutants, waste of raw materials, large fuel consumption, etc., and achieve the reduction of emission concentration , low operating cost, good effect

Inactive Publication Date: 2011-04-06
YUNNAN YUANXIN CARBON CO LTD
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Problems solved by technology

Generally, small-scale carbon factories have simple production processes, serious waste of raw materials, large fuel consumption, no pollution prevention and control facilities, and excessive discharge of pollutants

Method used

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  • Method for treating asphalt gas efficiently and harmlessly
  • Method for treating asphalt gas efficiently and harmlessly

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Embodiment Construction

[0018] First collect asphalt flue gas produced by asphalt head tank and asphalt mass flow meter, kneading, paste cooling, and vibration molding, and the flue gas induced draft fan will introduce the asphalt flue gas into the Venturi reactor, and mix it with the calcined petroleum coke powder in the Venturi reactor. In the reactor for reaction adsorption, the flue gas enters the bag filter to collect and reuse the dust and tar, and after removing the tar and dust-containing water vapor in the asphalt flue gas, it is incinerated in a regenerative incinerator, and the incineration temperature is > 800°C, incinerate for 1-2 seconds, decompose polycyclic aromatic hydrocarbons such as benzopyrene, benzanthracene, and carbazole in the flue gas after incineration, and effectively remove harmful substances such as benzopyrene. The content of harmful substances is less than 5mg / m 3， , far below the national secondary emission standards. During the treatment process, the low-temperature...

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Abstract

The invention discloses a method for treating asphalt gas efficiently and harmlessly. The method comprises the following steps of: performing reaction adsorption on the asphalt gas and calcined petroleum coke powder in a Venturi reactor; collecting dust and coke tar from the gas in a bag-type duster remover for recycle; after removing the coke tar and dust-containing steam in the asphalt gas, performing burning treatment by using a regenerative combustion furnace, wherein the burning temperature is higher than 800 DEG C and the burning time is 1 to 2 seconds; and decomposing polycyclic aromatic hydrocarbons such as benzopyrene, benzanthracene and carbazole in the gas after the burning treatment for effectively removing harmful substances of the polycyclic aromatic hydrocarbons such as the benzopyrene, the benzanthracene and the carbazole, wherein the harmful substance content of the treated gas is below 5 mg / m<3>. By using the method, the harmful substances of the polycyclic aromatic hydrocarbons such as the benzopyrene, the benzanthracene, the carbazole and the like are removed effectively; and the harmful substance content of the gas after the treatment is below 5 mg / m<3> which is far below a national secondary emission standard.

Description

technical field [0001] The invention relates to the technical field of production of prebaked anodes for aluminum electrolysis, in particular to a method for efficiently and harmlessly treating asphalt fume during the preparation process of prebaked anodes for aluminum electrolysis. Background technique [0002] The prebaked anode is made of calcined petroleum coke, pitch coke, residual pole (roasted crushed), raw crushed as aggregate, and coal tar pitch as binder. The raw anode formula is equipped with 14%-17% coal asphalt. The raw anode manufacturing process is as follows figure 1 shown. [0003] In addition to producing a large amount of dust during the production of raw anodes, a large amount of asphalt fume is also generated in the processes of batching, kneading and vibration forming. Asphalt smoke contains asphalt tar volatiles, the main components of which are more than 80 polycyclic aromatic hydrocarbons such as benzo[a]pyrene, benzanthracene, and carbazole, most...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/72B01D46/02
Inventor 杨实宁德元刘仕宏李再芳郭峻曹显平陈石平赵永林马华远
Owner YUNNAN YUANXIN CARBON CO LTD
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