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System and method for moisture removal and denitration after wet desulphurization of sintering flue gas

A technology for wet desulfurization and sintering flue gas, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of ultra-low emission of sintering flue gas, white smoke, etc., and achieve the effect of not being easy to scale and block

Inactive Publication Date: 2020-02-25
NANJING JINHAN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention provides a whitening and denitrification process after wet desulfurization of sintering flue gas, which can completely solve the ultra-low emission of sintering flue gas, and at the same time solve the problem of white smoke after wet desulfurization, and retain wet desulfurization relative to semi-dry desulfurization The advantages of high efficiency and resource utilization of desulfurization ash

Method used

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  • System and method for moisture removal and denitration after wet desulphurization of sintering flue gas

Examples

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Embodiment 1

[0023] as attached figure 1 , a dewhitening and denitrification system after wet desulfurization of sintering flue gas, comprising a dewhitening rotary heat exchanger 1, a wet electrostatic precipitator 2, a wet desulfurization unit 3, a hot blast stove 4, an ammonia injection device 5, and a denitrification unit 6 (i.e. denitration reactor), denitration catalyst 7, denitration rotary heat exchanger 8, booster fan 9 and chimney 10. Connect the sintering flue gas pipeline to the interface of the high temperature section of the raw flue gas of the dewhitening rotary heat exchanger 1; between the low temperature section of the raw flue gas of the dewhitening rotary heat exchanger 1 and the flue gas inlet of the wet desulfurization unit 3 between the outlet of the wet desulfurization unit and the inlet of the wet electrostatic precipitator 2; A connecting flue is installed between the interfaces; a connecting flue is installed between the interface of the high-temperature section...

Embodiment 2

[0029] The dewhitening and denitrification methods after wet desulfurization of sintering flue gas are as follows:

[0030] The flue gas from sintering passes through the flue, first enters the raw flue gas section of the dewhitening rotary heat exchanger 1, heats the heat exchange elements of the dewhitening rotary heat exchanger 1, and at the same time, the desulfurization flue gas needs to be dewhitened by the rotary heat exchanger The heat exchange element of device 1 is cooled and cooled, and the cooled flue gas (usually about 30-50 degrees) enters the wet desulfurization unit for desulfurization, and the desulfurized flue gas (about 45-50 degrees) enters through the flue The wet electrostatic precipitator 2 performs dust removal and water drop removal (removal of mechanical water), and then enters the whitening rotary heat exchanger 1, and is heated by the heat exchange element to raise the temperature by about 20-30 degrees, which is higher than the dew point temperature o...

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Abstract

The invention discloses a system and a method for moisture removal and denitration after wet desulphurization of sintering flue gas. A wet electric dust remover is arranged after wet desulphurization,and is used for removing water drops and dust in flue gas, the flue gas dedusted by the wet electric dust remover is heated by using flue gas heat before desulfurization through a moisture-removal rotary heat exchanger to make the flue gas entering a denitration system be superheated flue gas, the flue gas heated by the moiosture-removal rotary heat exchanger enters a denitration rotary heat exchanger, is continuously heated, and then is heated to a denitration reaction temperature through a hot blast stove, ammonia gas is sprayed into the heated flue gas through an ammonia spraying device, and NOx in the flue gas containing the ammonia gas is removed in the denitration reactor under the action of a catalyst, so flue gas denitration is achieved. The denitrated flue gas passes through thedenitration rotary heat exchanger, and releases heat to heat the flue gas needing denitration, so it is guaranteed that the flue gas exhausted out of a chimney does not emit white smoke like semi-drydesulfurization.

Description

technical field [0001] The invention relates to a whitening and denitrification device after wet desulfurization of sintering flue gas, belonging to the field of desulfurization and whitening of sintering flue gas. Background technique [0002] At present, as environmental protection requirements become more and more stringent, sintering flue gas and power plant boiler flue gas need to be treated with ultra-low emissions, and flue gas from wet desulfurization needs to be treated with whitening. Now many units have changed wet desulfurization to semi-dry desulfurization to solve the problem of white smoke from wet desulfurization, and some units have built de-whitening devices after wet desulfurization to eliminate white smoke. The investment of the first option is too high, and there is also the problem that semi-dry desulfurization is difficult to deal with; the second option is also relatively high in investment, and there are also problems of blockage and corrosion of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/86B01D53/90B01D53/56B01D53/78B01D53/48B03C3/16
CPCB01D53/48B01D53/75B01D53/78B01D53/8631B01D53/90B01D2258/0283B03C3/16
Inventor 孙军如
Owner NANJING JINHAN ENVIRONMENTAL PROTECTION TECH CO LTD