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System and method for treating sintered flue gas desulfurization and denitrification and wastewater

A technology for desulfurization, denitrification, and sintering flue gas, applied in chemical instruments and methods, filtration treatment, sludge treatment, etc. The effect of increasing lift

Active Publication Date: 2018-10-26
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the wet desulfurization and denitrification process, a large amount of sewage and wastewater will be generated, and at the same time, too much water will be carried out in the flue gas.

Method used

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  • System and method for treating sintered flue gas desulfurization and denitrification and wastewater
  • System and method for treating sintered flue gas desulfurization and denitrification and wastewater
  • System and method for treating sintered flue gas desulfurization and denitrification and wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 1) Sintering - flue gas

[0053] Clinker, raw meal and mixed liquor discharged from the mixing tank (the main component is Ca 2+ , NO 3 - , a small amount of NO 2 - ) enters the mixer in the sintering device to obtain the mixture, which is mixed and burned in the sintering machine with the gas input from the blast furnace, the air preheater and the air input from the boiler, and the obtained sintered material enters the air preheater and the air preheater cools down The sintered material enters the blast furnace;

[0054] 2) Flue gas desulfurization and denitrification

[0055] The flue gas discharged from the sintering machine (composed of fine particles, dust, CO, CO 2 , SO 2 , NO X etc.) and the ozone from the ozone generating device merge into the desulfurization tower, and the waste liquid (mainly composed of Ca 2+ and SO 4 2- ) into the desulfurization sedimentation tank for precipitation, the desulfurization waste slurry in the lower layer of the sedim...

Embodiment 2

[0066] 1) Sintering - flue gas

[0067] Clinker, raw meal and mixed liquor discharged from the mixing tank (the main component is Ca 2+ , NO 3 - , a small amount of NO 2 - ) enters the mixer in the sintering device to obtain the mixture, which is mixed and burned in the sintering machine with the gas input from the blast furnace, the air preheater and the air input from the boiler, and the obtained sintered material enters the air preheater and the air preheater cools down The sintered material enters the blast furnace;

[0068] 2) Flue gas desulfurization and denitrification

[0069] The flue gas discharged from the sintering machine (composed of fine particles, dust, CO, CO 2 , SO 2 , NO X etc.) and the ozone from the ozone generating device merge into the desulfurization tower, and the waste liquid (mainly composed of Ca 2+ and SO 4 2- ) into the desulfurization sedimentation tank for precipitation, the desulfurization waste slurry in the lower layer of the sedim...

Embodiment 3

[0077] A system for treating sintering flue gas desulfurization and denitrification wastewater, including sintering device, desulfurization device, denitrification device, filter press system, ozone generator, chimney, mixing pool, boiler, blast furnace, the flue gas outlet of the sintering device is connected to the desulfurization device, ozone The generator is connected to the desulfurization device, the material outlet of the sintering device is connected to the boiler and the blast furnace, the heat exchange medium outlet of the boiler is connected to the sintering device, the gas outlet of the blast furnace is connected to the sintering device, the desulfurization device is connected to the denitrification device, and the flue gas outlet of the denitrification device is connected to the chimney , the desulfurization device and the denitrification device are respectively connected to the filter press device, the filtrate outlet of the filter press device is respectively con...

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Abstract

The invention relates to a system and a method for treating sintered flue gas desulfurization and denitrification wastewater, belonging to the technical field of environmental protection. The method comprises the steps of carrying out precipitation reaction by virtue of Ca<+> in desulfurizing tower waste liquid and SO4<2-> in a denitrification tower, conveying reacted slurry to a gypsum pressure filtration system, carrying out pressure filtration so as to obtain gypsum, returning filtrate to a mixing tank, mixing concentrated flue gas condensate water from a chimney inlet with an upper-layer mixed solution in the mixing tank, conveying the mixed solution to a sintered material mixing process site to participate in mixing formation of a sintered material, and generating reduction reaction by virtue of the mixed material, nitrate and nitrite in water in the mixed material from the mixing tank and coke powder and coal powder in the sintered material under the effect of an iron base, so asto realize denitrification. The cyclic utilization and the harmless wastewater treatment are realized in the whole treatment process; and compared with the prior art, the desulfurization and denitrification wastewater is treated, and meanwhile, white smoke can be eliminated.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a system and method for treating sintering flue gas desulfurization and denitrification wastewater. Background technique [0002] According to the distribution of sintering / pellet desulfurization methods in the country, wet desulfurization accounts for the vast majority of the entire desulfurization methods, accounting for up to 83.5%, while limestone-gypsum methods account for the vast majority of wet desulfurization methods. Ozone oxidation denitrification has been applied in some sinter plants due to its suitability for sintering process and flue gas characteristics. 201610290678.7, a coal-fired boiler flue gas wet desulfurization and denitrification and wastewater treatment device and process, discloses a treatment method for wet desulfurization and denitrification wastewater. The supergravity reactor is used to strengthen the absorption of the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/18C02F101/16
CPCC02F9/00C02F1/70C02F1/58C02F1/52C02F1/001C02F2301/046C02F2103/18C02F2101/101C02F2101/166C02F2101/163C02F11/122
Inventor 王鹏吴黎男彭占东崔琳崔庆源
Owner SHANDONG UNIV
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