Desulfurization, denitrification and white smoke elimination device for ultralow emission of sintering machine flue gas and process thereof

A technology of desulfurization and denitrification, sintering machine, applied in the direction of combination device, gas treatment, membrane technology, etc., can solve the problems of SCR flue gas denitrification device can not run normally for a long period of time, high operating cost, high smoke concentration, etc., to achieve good dust removal and fog removal effect, avoid poisoning or clogging, effect with small fluctuation range

Inactive Publication Date: 2020-08-28
YANGCHUN NEW STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main denitrification component of the SCR denitrification device is a catalyst. When the SCR denitrification device is used to remove nitrogen oxides in the combustion flue gas, due to the high concentration of soot in the flue gas, high hardness, high abrasiveness, and more Dust that is easy to compact and coking aerosol and other substances can easily block the honeycomb pores and internal capillary pores of the catalyst, deactivate and fail the catalyst, and cause the SCR flue gas denitrification device to fail to operate normally for a long period of time. Restricted, and the denitrification project requires large investment and high operating costs

Method used

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  • Desulfurization, denitrification and white smoke elimination device for ultralow emission of sintering machine flue gas and process thereof
  • Desulfurization, denitrification and white smoke elimination device for ultralow emission of sintering machine flue gas and process thereof
  • Desulfurization, denitrification and white smoke elimination device for ultralow emission of sintering machine flue gas and process thereof

Examples

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Embodiment 1

[0046] Such as figure 1 As shown, the present invention provides a desulfurization, denitrification and whitening device for ultra-low emission of sintering machine flue gas, including: bag filter 1, primary desulfurization tower 2, secondary desulfurization tower 9, swirl type dust and mist eliminator 19. Wet electrostatic precipitator 18, dry desulfurizer 22, heat exchanger 23, flue gas heater 24, premixer 27, SCR denitrification reactor 28;

[0047] Among them, the bag filter 1 receives the sintering flue gas and communicates with the first-level desulfurization tower 2, the first-level desulfurization tower 2 includes the first-level desulfurization tower demister 3, the first-level desulfurization tower spray pipe 4, and the first-level desulfurization tower deflector 5, and communicate with the secondary desulfurization tower 9 in sequence; meanwhile, the lower part of the primary desulfurization tower 2 has a primary desulfurization tower slurry tank 6, and the primary ...

Embodiment 2

[0063] The desulfurization, denitrification and whitening device described in Example 1 for the ultra-low emission of sintering machine flue gas was used in the emission experiment of sintering flue gas, and the treatment of sintering flue gas in Baosteel Iron and Steel Plant was specifically tested. After running for one month, every week Test NOx, SO2, and dust concentration. After testing, it is found that after using the device described in Example 1 and related processes to treat sintering flue gas, the structures tested every week meet the ultra-low emission standard, NOx≤50mg / Nm 3 , SO2 concentration is ≤35mg / Nm 3 , the dust concentration is ≤10mg / Nm 3 .

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Abstract

The invention provides a desulfurization, denitrification and white smoke elimination device for ultralow emission of flue gas of a sintering machine and a process thereof. The device and the processare high in desulfurization, denitrification and dust removal efficiency and stable in long-term operation, reduce energy consumption and satisfy ultra-low emission requirements of sintering machinesand sintering agglomerates in the iron and steel industry. A double-tower device in a desulfurization system is subjected to desulfurization efficiency improvement and transformation, so that the ultra-low emission index of SO2 is achieved; a spiral-flow type efficient dust-removing demister and a wet type electric dust remover are arranged at the upper part of the secondary absorption tower, so that pollutants such as smoke dust, slurry fog drops, SO3 and heavy metals in the flue gas are effectively removed, and the ultralow emission index of the smoke dust is achieved; the denitration systemadopts a medium-low temperature SCR (Selective Catalytic Reduction) process, ammonia gas and NOx are subjected to a redox reaction under the action of a catalyst, NOx is reduced into N2 and H2O, andthe ultralow emission index of NOx is achieved.

Description

technical field [0001] The invention relates to the technical field of sintering machine flue gas treatment, in particular to a desulfurization, denitrification and whitening device for ultra-low emission of sintering machine flue gas and a process thereof. Background technique [0002] Sintering is an important link in the iron and steel production process. It is a sintered ore with sufficient strength and particle size that is obtained by mixing iron ore powder, anthracite powder and lime according to a certain ratio, and can be used as clinker for ironmaking. . Generally speaking, the iron ore used for sintering usually contains S and N in the form of compounds and oxo acid salts. Form released, resulting in a large amount of SO in the sintering flue gas 2 and NO X and other harmful gases, thereby polluting the air environment. [0003] Sintering flue gas has the characteristics of large smoke volume, high water content, low temperature, complex composition, high du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/86B01D53/90B01D53/82B01D53/50B01D53/80B01D50/00
CPCB01D50/00B01D53/504B01D53/75B01D53/82B01D53/8631B01D53/90B01D2258/0283
Inventor 罗斌贺丹傅搏胡四新陈飞龙曹建斌杨涛刘凯琪
Owner YANGCHUN NEW STEEL CO LTD
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