Roasting flue gas treatment method for carbon anode

A flue gas treatment, carbon anode technology, applied in the direction of combustion method, combustion product treatment, waste heat treatment, etc., can solve the problems of unsatisfactory treatment of asphalt tar, high energy consumption, etc., to reduce emissions, reduce energy consumption, and reduce investment Effect

Inactive Publication Date: 2018-12-07
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the deficiencies in the above-mentioned existing technologies, the present invention provides a method for treating flue gas from carbon anode roasting, which can solve the problems of high energy consumption and unsatisfactory treatment of asphalt tar in the current purification process of carbon anode roastin

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  • Roasting flue gas treatment method for carbon anode

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Example Embodiment

[0027] Example 1: The flue gas from the roaster passes through the combustion furnace (denitration agent: urea solution: sodium borohydride: ethanol = 8:1:3), waste heat boiler, desulfurization tower (desulfurization agent: milk of lime: dodecylsulfonic acid Sodium: citric acid = 8:2:3), wet electric capture, exhausted into the atmosphere through the chimney. The combustion furnace 2 is mainly composed of four parts: a combustion zone 9 , a denitrification zone 10 , a partition wall 11 and a settling chamber 12 . The fuel in the flue gas treatment process is mainly natural gas or heavy oil. In addition, a small amount of waste tar, petroleum coke, residual electrode, dust collection powder, waste cathode, coal, coal-based coke powder and other one or more mixtures can also be added. . The amount of fuel injected depends on the temperature of the denitrification zone. Pollutant components in the final exhaust flue gas: NOx content 40mg / Nm3, SO2 content 29 mg / Nm3, fluoride conte...

Example Embodiment

[0028] Example 2: The flue gas from the roaster passes through the combustion furnace (denitration agent: urea solution: sodium borohydride: ethanol = 6:2:4), waste heat boiler, desulfurization tower (desulfurization agent: milk of lime: dodecylsulfonic acid Sodium: citric acid = 9:3:3), wet electric capture, exhausted into the atmosphere through the chimney. The combustion furnace 2 is mainly composed of four parts: a combustion zone 9 , a denitrification zone 10 , a partition wall 11 and a settling chamber 12 . The fuel in the flue gas treatment process is mainly natural gas or heavy oil. In addition, a small amount of waste tar, petroleum coke, residual electrode, dust collection powder, waste cathode, coal, coal-based coke powder and other one or more mixtures can also be added. . The amount of fuel injected depends on the temperature of the denitrification zone. Pollutant components in exhaust flue gas: NOx content 33mg / Nm3, SO2 content 23 mg / Nm3, fluoride content 0.2 m...

Example Embodiment

[0029] Example 3: The flue gas from the roasting furnace passes through the combustion furnace (denitration agent: urea solution: sodium borohydride: ethanol = 1:4:4), waste heat boiler, desulfurization tower (desulfurization agent: milk of lime: dodecylsulfonic acid Sodium: citric acid = 10:3:3), after wet electric capture, it is discharged into the atmosphere through the chimney. The combustion furnace 2 is mainly composed of four parts: a combustion zone 9 , a denitrification zone 10 , a partition wall 11 and a settling chamber 12 . The fuel in the flue gas treatment process is mainly natural gas or heavy oil. In addition, a small amount of waste tar, petroleum coke, residual electrode, dust collection powder, waste cathode, coal, coal-based coke powder and other one or more mixtures can also be added. . The amount of fuel injected depends on the temperature of the denitrification zone. Pollutant components in exhaust flue gas: NOx content 15mg / Nm3, SO2 content 16mg / Nm3, ...

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Abstract

The invention discloses a roasting flue gas treatment method for a carbon anode. The roasting flue gas treatment method comprises the following steps: a flue gas discharged out of a roaster enters a combustion furnace and passes through a combustion region and a denitration region of the combustion furnace for combustion and denitration, and then, the amount of a fuel sprayed into the combustion region is determined by the temperature of the denitration region; after that, waste heat of the flue gas entering a heat recovery boiler is fully utilized, then, the temperature of the flue gas is reduced to 150-230 DEG C; the flue gas further enters a desulfurizer for desulfuration; the desulfurized flue gas is subjected to dust removal by an electric detarring precipitator; and finally, the fluegas is discharged into the atmosphere. The current problems of high energy consumption and poor asphalt disposal effect during purification of a roasting flue gas of a carbon anode are solved. The environmental protection requirements for energy saving and ultra-low emission of the roasting flue gas of the carbon anode can be well satisfied.

Description

technical field [0001] The invention belongs to the field of nonferrous light metal metallurgy, and in particular relates to a method for treating roasting flue gas in the production process of carbon anodes. Background technique [0002] As a key process in the production process of prebaked anodes, roasting has a decisive impact on the quality of the anode. A large amount of harmful pollutants are produced during the roasting process of the anode. The main pollutants include: fluoride, asphalt tar, dust, nitrogen oxides and so on. Among these pollutants, especially asphalt tar, which contains a variety of highly carcinogenic polycyclic aromatic hydrocarbons, such as benzopyrene, has great harm to human health and the environment. [0003] At present, the roasting flue gas is mainly purified by electric capture, alumina adsorption, carbon powder adsorption, and lye absorption. However, each method has its own advantages and disadvantages: the tar purification efficiency o...

Claims

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Application Information

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IPC IPC(8): F27D17/00F23G7/06F23J15/02
CPCF23G7/061F23G2204/10F23G2206/20F23J15/02F23J2215/10F23J2215/20F23J2219/10F27D17/00Y02P10/25
Inventor 张劲斌陈开斌李会林王芳平罗英涛杨宏杰
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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