Technology for enhancing low temperature flue gas while performing desulfurization and denitrification by using combined additive

A low-temperature flue gas, desulfurization and denitrification technology, applied in air quality improvement, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of low denitration rate, unable to meet NOx emission standards, difficult to effectively absorb, etc., to improve the denitration rate. , Improve the purity and promote the effect of denitrification

Inactive Publication Date: 2018-06-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

[0006] Aiming at the simultaneous desulfurization and denitrification process of ozone oxidation 2 It is difficult to effectively absorb, the denitrification rate is low, and the NOx emission standard cannot be met. The invention provides a process for combining additives to strengthen low-temperature flue gas desulfurization and denitrification

Method used

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  • Technology for enhancing low temperature flue gas while performing desulfurization and denitrification by using combined additive

Examples

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Effect test

Embodiment 1

[0034] SO in coke oven flue gas 2 Concentration 500mg / Nm 3 , NO x Concentration 400mg / Nm 3 , the temperature is 170°C. Adopt technology described in the present invention to process, and concrete method is:

[0035] (1) The flue gas is first mixed with a certain amount of ozone for oxidation, and the molar ratio of ozone to NOx in the flue gas is 1.1.

[0036] (2) The oxidized flue gas enters the absorption tower 1, contacts with the absorption slurry containing calcium-based absorbent and combined additives, and removes SO therein 2 and NOx. The pH of the absorption slurry was maintained between 5.5-6. Among them, the calcium-based absorbent is limestone, the component A in the combined auxiliary agent is sodium thiosulfate, and the component B is ammonia water. Sodium thiosulfate is mixed and dissolved with process water in component A dissolving tank 6 to obtain a solution, and ammonia water is directly added to component B dissolving tank 7 for subsequent use. Sodi...

Embodiment 2

[0041] SO in a sinter flue gas 2 Concentration 2000mg / Nm 3 , NO x Concentration 300mg / Nm 3 , the temperature is 150°C. Adopt technology described in the present invention to process, and concrete method is:

[0042] (1) The flue gas is first mixed with a certain amount of ozone for oxidation, and the molar ratio of ozone to NOx in the flue gas is 1.0.

[0043] (2) The oxidized flue gas enters the absorption tower 1, contacts with the absorption slurry containing calcium-based absorbent and combined additives, and removes SO therein 2 and NOx. The pH of the absorption slurry was maintained between 6.5-7. Among them, the calcium-based absorbent is quicklime, the A component in the combined auxiliary agent is potassium thiosulfate, and the B component is ammonium sulfate. Potassium thiosulfate and ammonium sulfate are mixed and dissolved with process water in component A dissolving tank 6 and component B dissolving tank 8 respectively to prepare solutions for subsequent us...

Embodiment 3

[0048] SO in the flue gas of a coal-fired boiler 2 Concentration 3000mg / Nm 3 , NO x Concentration 250mg / Nm 3 , the temperature is 130°C. Adopt technology described in the present invention to process, and concrete method is:

[0049] (1) The flue gas is first mixed with a certain amount of ozone for oxidation, and the molar ratio of ozone to NOx in the flue gas is 0.9.

[0050] (2) The oxidized flue gas enters the absorption tower 1, contacts with the absorption slurry containing calcium-based absorbent and combined additives, and removes SO therein 2 and NOx. The pH of the absorption slurry was maintained at 7-7.5. Among them, the calcium-based absorbent is calcium carbide slag, the A component in the combined additive is calcium thiosulfate, and the B component is ammonium sulfite. Calcium thiosulfate and ammonium sulfite are respectively mixed and dissolved with process water in component A dissolving tank 6 and component B dissolving tank 8 to prepare solutions for ...

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Abstract

The invention provides a technology for enhancing low temperature flue gas while performing desulfurization and denitrification by using a combined additive. Flue gas is firstly mixed with ozone, andNO in the flue gas is oxidized into NO2. The oxidized flue gas enters an absorption tower and is in contact with slurry containing a calcium-based sorbent and the combined additive, and SO2 and Nox inthe flue gas are removed. The purified flue is demisted through a demister and then is discharged. The addition of combined additive significantly improves the NOx removal efficiency, promotes NOx tobe converted into nitrite in an orientated manner, and high denitration ratio can still be kept in a condition of high accumulated concentration of nitrite ion, and the technology is beneficial to the reducing of the resource recycling cost of nitrite. The technology has the advantages of small amount of ozone, high NOx removal rate and low comprehensive cost, and is suitable for low-cost desulfurization and denitrification of low temperature flue gas from coke ovens, sintering and industrial boilers.

Description

technical field [0001] The invention belongs to the field of flue gas pollution control and relates to a process for combining auxiliary agents to strengthen low-temperature flue gas desulfurization and denitrification simultaneously. Background technique [0002] In recent years, flue gas SO in my country's iron and steel, coking, metallurgy and other non-electric industries 2 , NOx emission reduction has received widespread attention. National and local governments continue to introduce increasingly stringent emission standards, which puts the industry under enormous pressure to reduce emissions. Taking steel and coking industries as examples, sintering flue gas and coke oven flue gas are the main SO 2 and NOx emission sources. The emission temperature of these flue gases is generally low (150-250°C), which cannot meet the temperature window of the traditional SCR process. Therefore, the SCR denitrification technology that has been maturely used in the power industry ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/76B01D53/56B01D53/80B01D53/60
CPCB01D53/56B01D53/60B01D53/76B01D53/80B01D2251/104Y02A50/20
Inventor 李会泉王兴瑞孟子衡
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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