Treatment device and method of electrolytic aluminum carbon anode roasting flue gas and usage

A carbon anode and electrolytic aluminum technology, applied in the field of pollutant control, can solve the problems of high capital construction investment and maintenance costs, no purification effect, equipment corrosion, etc., and achieve the effects of small footprint, thorough removal, and improved absorption efficiency.

Inactive Publication Date: 2017-12-29
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some shortcomings in wet purification: the system is huge, the capital investment and maintenance costs are high, and the problems of wastewater discharge and equipment corrosion need to be solved
However, the anode roaster flue gas purification process of the electrolytic aluminum anode production plant has a great impact on the SO in the flue gas 2 and NO x Basically no purification effect

Method used

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  • Treatment device and method of electrolytic aluminum carbon anode roasting flue gas and usage

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] An electrolytic aluminum carbon anode roasting flue gas desulfurization, defluorination and deasphalting fume device, including a flue gas cooling system 1, an electric tar catcher 2, a pre-oxidation system 3, and a semi-dry purification system 4 connected in sequence, and the flue gas is cooled The outlet of system 1 is connected to the inlet of electric tar catcher 2, the outlet of electric tar catcher 2 is connected to the inlet of semi-dry purification system 4, and the intermediate flue of electric tar catcher 2 and semi-dry purification system 4 is provided with pre-oxidation system 3.

[0054] The flue gas cooling system 1 is composed of a full evaporative cooling tower, water pump, conveying pipeline, spray gun, and PLC control system. The electric tar collector 2 is a horizontal double electric field electrostatic precipitator. The pre-oxidation system 3 is composed of an oxidant supply device, a dilution fan, and a buffer The semi-dry purification system 4 cons...

Embodiment 2

[0062] Utilize the device described in embodiment 1, to the roasting flue gas purification of 100,000 tons / year carbon anode production plant:

[0063] The flue gas volume is 100000m 3 / h, the initial flue gas temperature is 150°C, SO 2 The concentration is 300mg / m 3 , NO x The concentration is 80mg / m 3 , the fluoride concentration is 50mg / m 3 , asphalt smoke concentration is 200mg / m 3 . The flue gas is cooled to 100°C through the flue gas cooling system, ozone is used as the oxidant, and fly ash is used as the absorbent. Processed SO 2 The concentration is 10mg / m 3 , NO x The concentration is 10mg / m 3 , the fluoride concentration is 2.5mg / m 3 , asphalt smoke concentration is 3.5mg / m 3 .

Embodiment 3

[0065] Utilize the device described in embodiment 1, to the roasting flue gas purification of 60,000 tons / year carbon anode production plant:

[0066] The flue gas volume is 50000m 3 / h, the initial flue gas temperature is 180°C, SO 2 The concentration is 500mg / m 3 , NO x The concentration is 120mg / m 3 , the fluoride concentration is 80mg / m 3 , asphalt smoke concentration is 300mg / m 3 . The flue gas is cooled to 90°C through the flue gas cooling system, hydrogen peroxide is used as the oxidant, and a mixed absorbent with a mass ratio of fly ash and lime of 1:1 is used. Processed SO 2 The concentration is 8mg / m 3 , NO x The concentration is 15mg / m 3 , the fluoride concentration is 2mg / m 3 , asphalt smoke concentration is 5mg / m 3 .

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Abstract

The invention relates to a treatment device and a method of electrolytic aluminum carbon anode roasting flue gas and a usage. The treatment device comprises a flue gas cooling system, an electrical tar precipitator, a preoxidation system and a semi-dry purification system that are sequentially connected, wherein an outlet of the flue gas cooling system is connected with an inlet of the electrical tar precipitator; an outlet of the electrical tar precipitator is connected with an inlet of the semi-dry purification system via a middle flue; and the middle flue is provided with the preoxidation system. Most pitch smoke in the flue gas is removed by the electrical tar precipitator; the preoxidation system oxidizes No into high-valence NOx and performs oxidative decomposition on the pitch smoke into CO2 and H2O; and then, SO2, high-valence NOx, fluoride and the pitch smoke are removed in the semi-dry purification system. Synergic control of various pollutants is achieved; the purification efficiency is higher; and the increasingly strict emission standard of the electrolytic aluminum carbon anode roasting flue gas can be met.

Description

technical field [0001] The invention relates to the technical field of pollutant control, in particular to a treatment device, method and application of electrolytic aluminum carbon anode roasting flue gas. Background technique [0002] Electrolytic aluminum carbon anode firing refers to the process of firing the formed green anode at a high temperature of 1150°C. The ingredients of the green anode include calcined coke obtained by calcining petroleum coke, asphalt as a binder, and a part of butt anode. The components of carbon anode roasting flue gas are relatively complex, and its main pollutants include particulate matter (350mg / m 3 ), SO 2 (300mg / m 3 ), NO x (50-120mg / m 3 ), fluoride (50-80mg / m 3 ) and asphalt smoke (185mg / m 3 ), the discharge of many pollutants exceeded the standard. The roasting process is an important process in the production of electrolytic aluminum carbon anodes, and the pollutant emissions account for a relatively high proportion of pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/80B01D53/60B01D53/68B01D50/00
CPCB01D50/00B01D53/60B01D53/68B01D53/75B01D53/80B01D2251/10B01D2251/104B01D2251/106B01D2251/108B01D2252/10B01D2252/504B01D2258/0283Y02A50/20
Inventor 朱廷钰刘霄龙范朝伟
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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