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Technological method of desulfurization, denitrification, dust removal, white elimination and purification for sintering flue gas

A technology of sintering flue gas, desulfurization and denitrification, which is applied in the direction of chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems of white smoke from flue gas and high energy consumption, and achieve reduction of water consumption, reduction of gas consumption, The effect of lowering the temperature

Inactive Publication Date: 2019-04-12
LIUZHOU IRON & STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the current sintering flue gas desulfurization and denitrification technology has high energy consumption, and the flue gas discharged into the atmosphere emits white smoke

Method used

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  • Technological method of desulfurization, denitrification, dust removal, white elimination and purification for sintering flue gas

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Embodiment Construction

[0032] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the present invention will now be described with reference to the accompanying drawings.

[0033] Technical principle of the present invention

[0034] Denitrification principle:

[0035] 4NO+4NH 3 +O 2 →4N2 +6H 2 o

[0036] 2NO 2 +4NH 3 +O 2 →3N 2 +6H 2 o

[0037] Desulfurization principle:

[0038] NH 3 +SO 2 +H 2 O=NH 4 HSO 3

[0039] 2NH 3 +SO 2 +H 2 O=(NH 4 ) 2 SO 3

[0040] (NH 4 ) 2 SO 3 +SO 2 +H 2 O=2NH 4 HSO 3 (Main reaction for desulfurization)

[0041] NH 4 HSO 3 +NH 3 =(NH 4 ) 2 SO 3

[0042] The principle of flue gas heating and cooling: ①Transfer the heat of the high-temperature sintered flue gas after denitration to the sintered raw flue gas at the denitrification inlet through the rotary flue gas heat exchanger (GGH), so as to increase the flue gas temperature at the denitrification inlet and reduce the ...

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Abstract

The invention provides a technological method of desulfurization, denitrification, dust removal, white elimination and purification for sintering flue gas. The technological method includes the stepsthat sintering raw flue gas is introduced into a rotary type flue gas heat exchanger and has heat exchange with high-temperature sintering flue gas which enters the rotary type flue gas heat exchangerafter denitrification, heated sintering raw flue gas is heated to 320 DEG C through an after-burning device, then ammonia gas is uniformly sprayed into the heated sintering raw flue gas, then the mixture enters a denitrification reactor for flue gas denitrification, after denitrification, high-temperature sintering raw flue gas returns heat to the sintering raw flue gas through the rotary type flue gas heat exchanger and then enters an ammonia process desulfurization system for cooling, dust removing and desulfurizing, and finally deep dust removal and mist removal are conducted on the flue gas after densulfurization so that desulfurized pure flue gas after desulfurization and mist removal can enter a flue gas water-medium type heat exchanger temperature-increase segment. Energy consumption needed by denitrification of sintering flue gas is lowered, after desulfurization, the temperature and the water content of the saturated flue gas are decreased, the temperature of the desulfurizedflue gas is increased through the rotary type flue gas heat exchanger to realize white elimination of the flue gas, the technological route is simple, and operation is easy.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to flue gas purification technology, in particular to a sintering flue gas desulfurization, denitrification, dust removal, whitening and purification process. Background technique [0002] In the iron and steel industry or other industrial production, the flue gas produced by the combustion between raw materials and fuels contains a large amount of nitrogen oxides, sulfur dioxide and particulate matter, which has caused certain pollution to the atmosphere. In May 2018, China issued the "Work Plan for Ultra-Low Emission Transformation of Iron and Steel Enterprises (Draft for Comments)". The "Draft for Comment" clarified that iron and steel enterprises in various regions should carry out ultra-low emission transformation step by step. Under the condition of the reference oxygen content of 16%, the hourly average emission concentrations of particulate matter, sulfur dioxide, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56B01D53/50B01D45/16B01D53/34
CPCB01D45/16B01D53/343B01D53/78B01D53/8625B01D53/90
Inventor 甘贵平甘牧原陈阳黎柳升韦晋科吴文升杨鹏张艾红谢运强刘丽芳吴丹伟刘华向小平尹志群韦柳婵莫龙桂卢福德梁杰群胡艳君黄靖
Owner LIUZHOU IRON & STEEL
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