Carbon product calcining furnace flue gas cleaning treatment process

Abstract

The present invention discloses a method for gas cleaning processing of a carbon product roaster, and relates to a method for gas cleaning processing of a carbon roasting process such as aluminum electrolyzing carbon anode. The method is characterized in that the high temperature fume produced by an incinerator in the carbon anode production process and the low temperature fume produced by the roaster are mixed to be incinerated. The method mixes the fume produced by the carbon product incinerator and the fume produced by the roaster, and uses the afterheat of the fume in the incinerator to heat the fume in the roaster so that the pitch fume and the carbon dusts are burned. The incinerated fume uses an exhaust-heat boiler to recover the water heat thereof, and lastly the gas is dischargedinto atmosphere after desulfuration and defluorination processes. The fume in the roaster is less than 10mg / <m3> in discharge concentration after being processed. The method not only has the advantages of simple process flow, easy operation and lower operation cost, but also has significant socioeconomic and environmental protection benefits.

Description

technical field [0001] A method for purifying flue gas of a roasting furnace for carbon products relates to a method for purifying flue gas in the roasting process of carbon such as aluminum electrolytic carbon anodes. Background technique [0002] During the carbon roasting process of aluminum electrolytic carbon anode, etc., the flue gas produced contains asphalt smoke and carbon particles, as well as fluorine-containing gas (due to the recycling of residual anodes from electrolytic production) and SO 2 , These are extremely harmful substances to human life and survival. These harmful and toxic gases cannot be directly discharged into the atmosphere, so methods for dealing with these waste gases and toxic gases will be involved. [0003] The existing roaster flue gas treatment methods are: [0004] (1) Water washing method: because water and tar are incompatible, the purification efficiency is 70-80%, and the water adsorbing tar cannot be discharged without treatment, ca...

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Problems solved by technology

[0004] (1) Water washing method: Since water and tar are incompatible, the purification efficiency is 70-80%, and the water that absorbs tar cannot be discharged without treatment, resulting in secondary pollution of water, which is difficult to handle

[0005] (2) Electrostatic capture method: This method has the following disadvantages: the collected tar needs secondary treatment; equipment cleaning is difficult and maintenance costs are high; explosive combustion is prone to occur during operation; fluorine-containing gases and SO 2

Its disadvantages are: alumina adhered with tar will affect its delivery and use in the electrolytic cell; charcoal powder adsorbed with tar will also affect the accuracy of ingredients; the process is complicated; the operating cost is high; fluorine-containing gases cannot be removed at the same time and SO 2

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