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Method for segmental gathering, waste-heat utilization and SOx-NOx emission reduction of iron ore sintering flue gas

A sintering flue gas and enrichment technology, applied in the field of iron ore sintering, can solve the problems of low sensible heat utilization rate of sintered ore and high cost of flue gas purification, and achieve the effect of strong applicability and reduced operating costs

Active Publication Date: 2017-08-01
钢研晟华科技股份有限公司
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Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide an iron ore sintering flue gas segmental enrichment and waste heat utilization reduction SO x and NO x The method is used to solve the problems of low utilization rate of sensible heat of sinter and high cost of flue gas purification in the prior art

Method used

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  • Method for segmental gathering, waste-heat utilization and SOx-NOx emission reduction of iron ore sintering flue gas
  • Method for segmental gathering, waste-heat utilization and SOx-NOx emission reduction of iron ore sintering flue gas
  • Method for segmental gathering, waste-heat utilization and SOx-NOx emission reduction of iron ore sintering flue gas

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Embodiment

[0054] Take a steel 210m 2 Taking the sintering machine as an example, there are 27 bellows in total, and the flue gas concentration is shown in Table 1.

[0055] Mix the flue gas from No. 1-16 sintered bellows 2 into flue 3 in the denitration section, and mix the flue gas from No. 17-27 sintered bellows 2 into flue 4 in the desulfurization section. The flue gas volume in flue 3 in the denitrification section is 177,000 Nm 3 / h, temperature 78℃, SO 2 Concentration 83mg / Nm 3 , NO x Concentration 183mg / Nm 3 ; The flue gas volume of the flue 4 in the desulfurization section is 149,000 Nm 3 / h, temperature 260℃, SO 2 Concentration 727mg / Nm 3 , NO x Concentration 25mg / Nm 3 .

[0056] The flue gas in the flue 3 of the denitrification section is exchanged with the sintered ore through the vertical cooler 7, and the temperature of the desulfurized tail gas after the heat exchange is above 350°C, and the dust is removed by the electrostatic precipitator to make the dust concen...

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Abstract

The invention relates to a method for segmental gathering, waste-heat utilization and SOx-NOx emission reduction of iron ore sintering flue gas. The method is particularly suitable for an iron ore sintering flue gas treatment process in the iron and steel industry. The method can serve as enterprise supporting construction for an existing sintering desulfurization process and also can serve as new construction for a mature sintering flue gas desulfurization process. The method includes a low-temperature high-NOx low-SOx flue gas and sintering ore heat exchange and NOx removal process and a high-temperature high-SOx low-NOx heat recovery and SOx removal process. The technological method provided by the invention can be used for fully recovering sintering ore and sintering flue gas waste heat and reducing emission of SOx and NOx at the same time, has the advantages of being short in process flow, high in applicability, low in investment and operation cost and the like, and has quite high application value.

Description

technical field [0001] The invention relates to the technical field of iron ore sintering, in particular to a method for segmental enrichment of iron ore sintering flue gas and utilization of waste heat to reduce SO emission x and NO x method. Background technique [0002] my country's iron and steel production is dominated by the blast furnace-converter long process, sintering ore accounts for about 70% to 75% of the blast furnace charge, and the sintering process SO 2 Emissions and NOx emissions account for about 60% and 50% of the steel process, and are the main sources of air pollution. At present, the technology of sintering flue gas desulfurization is mature, and there are many methods. There are about 1,300 sets of sintering desulfurization facilities built and put into operation in China. However, little progress has been made in the construction of sintering flue gas denitrification. There are less than 10 sintering denitrification devices reported in my country....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00
CPCF27D17/00F27D17/004
Inventor 王海风张春霞齐渊洪郄俊懋周和敏严定鎏王锋高建军林万舟
Owner 钢研晟华科技股份有限公司
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