Method and system for purifying flue gas of carbon roasting furnace

A technology of flue gas purification system and carbon roasting furnace, which is applied in the direction of chemical instruments and methods, separation methods, furnaces, etc., can solve the problem that the concentration of pollutants cannot meet the requirements of special emission limit values, and achieve high reliability and adaptability to work. The effect of environment change and low operating cost

Pending Publication Date: 2021-08-27
北京铝能清新环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The concentration of pollutants in the flue gas obtained by the existing flue gas treatment process has not reached the special emission limit requirements

Method used

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  • Method and system for purifying flue gas of carbon roasting furnace
  • Method and system for purifying flue gas of carbon roasting furnace
  • Method and system for purifying flue gas of carbon roasting furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The amount of flue gas produced in the roasting workshop of a carbon factory is about 135000Nm 3 / h, the average negative pressure of the flue is -2000Pa, the maximum negative pressure is -3000Pa, and the amount of asphalt smoke is 180mg / Nm 3 , the amount of particulate matter is 260mg / Nm 3 , SO 2 Average 400mg / Nm 3 , maximum 1000mg / Nm 3 , nitrogen oxide concentration 150mg / Nm 3 . use as figure 1 The shown carbon roasting furnace flue gas purification method uses such as figure 2 The purification system shown, steps and results are as follows:

[0061] Step 1) Denitrification: Spray the dry powder denitrification agent into the appropriate temperature point in the roaster furnace, so that the dry powder denitrification agent reacts with the nitrogen oxides in the flue gas, and the concentration of nitrogen oxides in the flue gas after denitrification is about 48mg / Nm 3 , to obtain flue gas from which nitrogen oxides are removed, the temperature of which is abou...

Embodiment 2

[0068] The amount of flue gas produced in the roasting workshop of a carbon factory is about 120,000Nm 3 / h, the average negative pressure of the flue is -2200Pa, and the amount of asphalt smoke is 190mg / Nm 3 , particulate matter 230mg / Nm 3 , SO 2 Average 600mg / Nm 3 , maximum 1000mg / Nm 3 , nitrogen oxide concentration 80mg / Nm 3 . use as figure 1 The shown carbon roasting furnace flue gas purification method uses such as image 3 The purification system shown, steps and results are as follows:

[0069] Step 1) Denitrification: Spray the dry powder denitrification agent into the calciner at a suitable temperature point, so that the dry powder denitrification agent reacts with the nitrogen oxides in the flue gas, and the concentration of nitrogen oxides in the flue gas after denitrification is about 40mg / Nm 3 , to obtain flue gas from which nitrogen oxides are removed, the temperature of which is about 120°C;

[0070] Step 2) Cooling: Pass the obtained flue gas from nitr...

Embodiment 3

[0076] The amount of flue gas produced in the roasting workshop of a carbon factory is about 140,000Nm 3 / h, the average negative pressure of the flue is -2600Pa, and the amount of asphalt smoke is 150mg / Nm 3 , the amount of particulate matter is 280mg / Nm 3 , SO 2 Average 500mg / Nm 3 , the maximum value is 800mg / Nm 3 , nitrogen oxide concentration 110mg / Nm 3 . use as figure 1 The shown carbon roasting furnace flue gas purification method uses such as image 3 The purification system shown, steps and results are as follows:

[0077] Step 1) Denitrification: Spray the dry powder denitrification agent into the appropriate temperature point in the roaster furnace, so that the dry powder denitrification agent reacts with the nitrogen oxides in the flue gas, and the concentration of nitrogen oxides in the flue gas after denitrification is about 45mg / Nm 3 , to obtain flue gas from which nitrogen oxides are removed, the temperature of which is about 160°C;

[0078] Step 2) Cooli...

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Abstract

The invention discloses a method and a system for purifying flue gas of a carbon roasting furnace. The method comprises the steps of denitration, cooling, tar removal, desulfurization and demisting, dust removal and the like. A dry powder denitration agent direct injection method is adopted for denitration, a water mist spraying method is adopted for cooling, an electrical tar precipitator is adopted for tar removal, and wet desulfurization is adopted for desulfurization. The system comprises a denitration unit, a cooling unit, a tar removal unit, a desulfurization and demisting unit and a dust removal unit. By adopting the method and the system, pollutants such as nitrogen oxides, tar, sulfur dioxide, fog drops, dust and the like in the flue gas of the carbon roasting furnace can be removed below emission limits, and the method and the system are simple, practical, high in efficiency and low in operation cost.

Description

technical field [0001] The invention relates to an industrial waste gas purification treatment technology, in particular to a carbon roasting furnace flue gas purification method and system thereof. Background technique [0002] The carbon roasting production process often uses natural gas as fuel and produces a large amount of flue gas, which contains nitrogen oxides, tar, SO 2 , dust and other pollutants. At present, the flue gas treatment of domestic carbon roasters is only treated by cooling spray tower (adding lime desulfurization) + vertical honeycomb electric tar collector, and only simple tar removal and desulfurization measures are taken. According to GB25465-2010 "Aluminum Industry Pollutant Emission Standards" revision list for the flue gas emission requirements of production enterprises, the particulate matter in the flue gas after purification must not exceed 10mg / m 3 , SO 2 Not higher than 100mg / m 3 , NO X Not higher than 100mg / m 3 , asphalt smoke not hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/50B01D53/56B01D53/80B01D53/83B03C3/017F27D17/00
CPCB01D53/502B01D53/56B01D53/75B01D53/80B01D53/83B01D2251/404B01D2251/606B01D2258/0283B03C3/017F27D17/00F27D17/008
Inventor 王琰位凯娜殷志成李永艳
Owner 北京铝能清新环境技术有限公司
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