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High-efficiency energy-saving sintering flue gas multi-pollutant purification process

A high-efficiency and energy-saving technology for sintering flue gas, applied in gas treatment, air quality improvement, chemical instruments and methods, etc., can solve problems such as pollution, energy waste, and limited purification effect, and achieve wide application range, convenient operation, and good economy sexual effect

Pending Publication Date: 2018-09-25
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Nevertheless, there are still many problems in practical application, such as: (1) Due to the low temperature of the flue gas, in order to ensure the working temperature of the denitration reaction, additional heating is required to increase the temperature of the flue gas, which requires a lot of energy consumption (2) The flue gas contains a certain amount of CO gas, and the desulfurization and denitrification process has limited purification effect on it, and direct emission will cause certain pollution; (3) CO in the flue gas is also an energy substance, and direct emission will cause a certain amount of energy waste

Method used

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Experimental program
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Effect test

Embodiment 1

[0027] CO oxidation catalyst module:

[0028] The packed and molded catalyst in the CO catalytic oxidation device adopts modular packing, the catalyst loading amount is determined according to the actual flue gas conditions and process requirements, and the space velocity is 5000-50000h -1 . When the gas containing CO enters the CO oxidation catalyst at 50°C, the temperature of the gas after the catalyst bed and after the catalyst bed increases significantly. When the CO concentration in the flue gas is 1%, the temperature of the flue gas after passing through the CO oxidation catalyst increases to 149°C.

Embodiment 2

[0030] The initial sintering flue gas contains about 1% CO, NOx concentration is 190-210ppm, SO 2 Concentration is 200~280ppm, O 2 The content is about 14%, and the flue gas temperature is 140-170°C. After passing the above-mentioned flue gas through the process described in this patent, the temperature of the flue gas at the inlet of the low-temperature SCR denitrification device is stable above 200°C, the NOx concentration in the flue gas after denitrification is lower than 20ppm, and the NOx removal rate is higher than 90%, showing Higher purification effect.

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Abstract

The invention relates to a high-efficiency energy-saving sintering flue gas multi-pollutant purification process, which belongs to the field of integrated industrial flue gas multi-pollutant purification. The high-efficiency energy-saving sintering flue gas multi-pollutant purification process mainly comprises the following parts: the high-efficiency energy-saving sintering flue gas multi-pollutant purification process is characterized by comprising a sintering machine (1), a dust removal and desulfurization device (2), a CO catalytic oxidation device (3), a SCR (Selective Catalytic Reduction)denitration reactor (4) and the like, wherein the CO catalytic oxidation device can increase temperature for the catalytic oxidation of CO without hazards. The process related to the invention has the advantages of wide application range, energy saving, environmental friendliness and the like in comparison with conventional processes, and has good economical efficiency and potential industrial application value.

Description

technical field [0001] The invention relates to a process for purifying multi-pollutants of sintering flue gas, which belongs to the field of integrated purification of multi-pollutants of industrial flue gas. Background technique [0002] The rapid development of industrialization and the rapid progress of urbanization. At the same time, a large number of industrial emissions have caused frequent polluting weather, and the emissions from the iron and steel metallurgical industry have received great attention. The sintering process is an important part of the production of iron and steel enterprises, and it is also the link with the largest pollution discharge, with a large amount of SO 2 , NOx and other pollutant emissions. The newly promulgated environmental protection standards for fine particulate matter, SO 2 , NOx and other pollutants have clearer and stricter requirements, and the construction and upgrading of environmental protection facilities is a major task for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/81B01D53/50B01D53/86B01D53/75B01D53/62B01D53/56
CPCB01D53/50B01D53/508B01D53/75B01D53/80B01D53/81B01D53/8625B01D53/8628B01D53/8631B01D53/864B01D2258/0283Y02A50/20
Inventor 宋丽云李坚何洪梁文俊
Owner BEIJING UNIV OF TECH