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Sintered flue gas full-process purification system and method thereof

A technology for sintering flue gas and purification system, which is applied in the field of sintering flue gas purification, can solve the problems of inability to purify sintering flue gas in the whole process, high energy consumption, and substandard purification results, and achieves good desulfurization effect, high denitration efficiency, and operation. The effect of cost control

Pending Publication Date: 2018-03-23
MCC CAPITAL ENGINEERING & RESEARCH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a whole-process purification system and method for sintering flue gas, which overcomes the problems existing in the prior art that the sintering flue gas cannot be purified throughout the process, high energy consumption, and the purification results are not up to standard, etc., and realizes the full-process purification of the sintering flue gas Process purification, reducing purification energy consumption, and the emission concentration of flue gas nitrogen oxides is lower than 100mg / Nm 3 , in line with the requirements of nitrogen oxide emission indicators

Method used

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  • Sintered flue gas full-process purification system and method thereof

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Embodiment 1

[0058] As a specific implementation of this embodiment, the sintering flue gas drawn from the wind box 8 of the sintering machine is collected together. At this time, the SO in the sintering flue gas 2 The concentration is 1500mg / Nm 3 , NOx concentration is 450mg / Nm 3 , the dust concentration is 3000mg / Nm 3 , the flue gas temperature is 120°C, the sintering flue gas is directly introduced into the dust removal device 1 (electrostatic dust removal device) through the booster fan 6, and the dust concentration is reduced to 100mg / Nm 3 , and then send the sintering flue gas into the second sintering flue gas channel of the heating device 2 (heating furnace), and use blast furnace gas (or combustible gases such as coke oven gas, converter gas, and various purge gases) to burn the second sintering gas. The sintering flue gas in the flue gas channel is heated to 320°C, and the heated sintering flue gas enters the denitrification device 3 equipped with a medium-temperature (conventi...

Embodiment 2

[0060] As another specific implementation of this embodiment, the sintering flue gas drawn from the wind box 8 of the sintering machine is collected together. At this time, the SO in the sintering flue gas 2 The concentration is 1000mg / Nm 3 , NOx concentration is 350mg / Nm 3 , the dust concentration is 2000mg / Nm 3 , the flue gas temperature is 160°C, the sintering flue gas is directly introduced into the dust removal device 1 (electrostatic dust removal device) through the booster fan 6, and the dust concentration is reduced to 50mg / Nm 3 , and then send the sintering flue gas into the second sintering flue gas channel of the heating device 2 (heating furnace), and use blast furnace gas (or combustible gases such as coke oven gas, converter gas, and various purge gases) to burn the second sintering gas. The sintering flue gas in the flue gas channel is heated to 260°C, and the heated sintering flue gas enters the denitrification device 3 equipped with a low-temperature catalys...

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Abstract

The invention provides a sintered flue gas full-process purification system and a method of the sintered flue gas full-process purification system. An inlet of the sintered flue gas full-process purification system is provided with a dedusting device capable of performing dedusting processing on sintered flue gas, an inlet of the dedusting device communicates with a sintering machine air bellow capable of leading out the full-process flue gas of a sinter, and an outlet of the dedusting device communicates with a temperature raising device capable of performing temperature-raising processing onthe sintered flue gas. An outlet of the temperature raising device communicates with a denitrification device capable of performing denitrification processing on the sintered flue gas, an outlet of the denitrification device communicates with a waste heat recycling device capable of lowering the temperature of the sintered flue gas through heat exchange, and an outlet of the waste heat recyclingdevice communicates with a desulfuration device capable of performing desulfuration processing on the sintered flue gas. By means of the sintered flue gas full-process purification system and the method of the sintered flue gas full-process purification system, full-process purification of the sintered flue gas is achieved, purification energy consumption is lowered, the nitrogen oxide dischargingconcentration of the flue gas is lower than 100 mg / <Nm>3, and the emission index requirements of the nitrogen oxides are met.

Description

technical field [0001] The invention relates to the technical field of sintering flue gas purification, in particular to a whole-process purification system and method for sintering flue gas. Background technique [0002] With the development of the national economy and the improvement of people's living standards, people pay more and more attention to environmental issues. As a pollutant closely related to air quality, nitrogen oxides have always been the focus of the country. According to the statistics of the Ministry of Environmental Protection, in 2015, the national industrial waste gas emissions of NOx totaled 11.809 million tons, of which 1.04 million tons were emitted from ferrous metal smelting and rolling processing, which is one of the three major emission sources. The sintering machine of iron and steel enterprises (ferrous metal smelting) is a key NOx emission source, and its flue gas denitrification has also received more and more attention. "Emission Standard...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00
CPCF27D17/004F27D17/008Y02P10/25
Inventor 周向张传波张宇鑫王建华董艳苹
Owner MCC CAPITAL ENGINEERING & RESEARCH
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