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Flue gas circulation system and method for sintering machine flue gas recirculation denitration

A flue gas recirculation and sintering machine technology, which is applied in the field of air pollutant control in the iron and steel industry, achieves the effects of small changes, low operating costs, and wide application prospects

Inactive Publication Date: 2015-07-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, limited by the special combustion method of the sintering machine and in order to ensure the quality of sintering ore, low-nitrogen combustion and staged combustion technologies are not suitable for application in sintering machines

Method used

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  • Flue gas circulation system and method for sintering machine flue gas recirculation denitration

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Embodiment 1

[0029] A sintering machine flue gas recirculation denitrification method using the flue gas circulation system, implemented in a 360m 2 Belt sintering machine. The denitrification process is as follows: the base material and the mixed material are respectively laid on the trolley 5 by the base material tank 1 and the mixed material tank 2, and are burned on the trolley 5 after being ignited by the ignition furnace 3 and kept warm by the holding furnace 4; Enter the front bellows 6, the middle bellows 7 and the rear bellows 8 respectively; part of the flue gas in the middle bellows 7 (the temperature of the flue gas is about 150°C) and the rear bellows 8 (the temperature of the flue gas is about 400°C) enters the large flue 15. Part of it is extracted by the recirculation fan 13 and enters the recirculation flue 12 from the first branch pipe 9 and the second branch pipe 10. The flow rate of the recirculation flue gas is controlled by the regulating valve 11, and the circulation...

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Abstract

The invention discloses a flue gas circulation system and method for sintering machine flue gas recirculation denitration. The flue gas circulation system is composed of a sintering machine, a branch pipe I, a branch pipe II, regulating valves, a recirculation flue, a recirculation draught fan and a top-suspended flue gas hood. The method comprises the steps that the recirculation draught fan is utilized to extract flue gas in the middle section and the rear section of a wind box of the sintering machine, recirculation flue gas enters the recirculation flue through the branch pipe I and the branch pipe II, enters the top-suspended flue gas hood, and enters a high-temperature combustion zone of a trolley again from the top of the sintering machine, NOx in the flue gas is restored to be N2 through coke, and the NOx is removed. According to the flue gas circulation system and method for the sintering machine flue gas recirculation denitration, on the premise that the combustion mode of the sintering machine and the sinter quality are not changed, the NOx is removed efficiently, the changes to a system are less, the operating cost is low, the operation is simple, convenient and flexible, and the denitration efficiency is high; the flue gas circulation system and method for the sintering machine flue gas recirculation denitration have wide application prospect in the field of sintering machine flue gas denitration.

Description

technical field [0001] The invention belongs to the technical field of air pollutant control in the iron and steel industry, and in particular relates to a flue gas circulation system and method for sintering machine flue gas recirculation and denitrification. Background technique [0002] Sintering ore is an essential raw material in the steel production process, and the sintering process is one of the main processes in steel production. With the development of my country's iron and steel industry, the output of sintering ore has increased greatly. However, the sintering process produces a large amount of NO x , SO 2 Pollutants such as dust and dust have put forward a test for the clean production and sustainable development of the steel industry. [0003] Currently, SO emissions from sintering machines 2 Advanced wet desulfurization equipment and dust removal equipment have been put into operation in large quantities, and relatively good results have been achieved. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00
Inventor 宋蔷付世龙姚强
Owner TSINGHUA UNIV
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