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A denitrification method suitable for sintering flue gas

A technology for sintering flue gas and denitrification, which is applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of low feasibility and high operation cost of sintering flue gas, and save heating energy consumption and reduce operating costs. Effect

Active Publication Date: 2022-05-10
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, the current mature desulfurization and denitrification process is to desulfurize first and then denitrify. The purpose is to prevent the poisoning effect of dust and sulfur dioxide on the denitrification catalyst. It can be applied to flue gas in power plants, but it is not feasible for sintering flue gas due to high operating costs. Therefore, it is necessary to develop a process suitable for denitrification first and then desulfurization of sintering flue gas

Method used

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  • A denitrification method suitable for sintering flue gas
  • A denitrification method suitable for sintering flue gas
  • A denitrification method suitable for sintering flue gas

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Experimental program
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Effect test

Embodiment 1

[0030] See image 3 , the sintering machine 1 has a total of 24 wind boxes 2, and the flue gas volume is 1 million m 3 / h, select 4# to 21# bellows 2 for denitrification, the initial concentration is 290mg / m 3 , the flue gas temperature is 210°C, the flow velocity in the denitrification catalyst chamber 12 is 1.5m / s, the catalyst ball diameter is 2cm, and the denitrification efficiency is 87%, so that the total flue gas emission nitrogen oxide concentration is less than 50mg / m 3 . After conventional dust removal and desulfurization, the flue gas can reach the ultra-clean emission standard.

Embodiment 2

[0032] See Figure 4 , the sintering machine 1 has a total of 24 wind boxes 2, and the flue gas volume is 1 million m 3 / h, select 4# to 20# wind box 2 for denitrification, the initial concentration is 350mg / m 3 , the flue gas temperature is 180°C, the flue gas temperature is 260°C after heat exchange with the ring cooling waste heat, the flow velocity in the denitration catalyst chamber 12 is 1.2m / s, the diameter of the catalyst pellet is 1.5cm, and the denitration efficiency is 95.6%. The concentration of nitrogen oxides emitted by the total flue gas volume is less than 50mg / m 3. Then after conventional dust removal, the flue gas after desulfurization can reach the ultra-clean emission standard.

Embodiment 3

[0034] See Figure 5 , the sintering machine 1 has a total of 24 wind boxes 2, and the flue gas volume is 1 million m 3 / h, select 7# to 22# air box 2 for denitrification, the initial concentration is 100mg / m 3 , the denitration flue gas temperature is 220°C, the flow velocity in the denitration catalyst chamber 12 is 2.2m / s, the diameter of the catalyst ball is 2.5cm, and the denitration efficiency is 89%, so that the total flue gas emission concentration of nitrogen oxides is less than 40mg / m 3 . Then after conventional dust removal, the flue gas after desulfurization can reach the ultra-clean emission standard.

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Abstract

The invention relates to a denitrification method suitable for sintering flue gas. The temperature of each wind box is measured, and then the nitrogen oxide concentration of each wind box is measured; the flue gas temperature is above 100°C and the nitrogen oxide concentration is greater than 50 mg / m 3 air box, or the temperature is less than 100°C and the concentration of nitrogen oxides is greater than 200mg / m 3 air box, or a wind box with a flue gas temperature greater than 300°C; the flue gas from the selected wind box is introduced into the denitrification facility for denitrification, and then merged with the remaining bellows flue gas into the dust collector and desulfurization facility, the flue gas after denitrification and desulfurization into the chimney into the atmosphere. The advantage is that denitrification can be carried out without dust removal and desulfurization without catalyst poisoning, and then the desulfurization process can be carried out. Compared with the existing desulfurization first and then denitrification, this kind of process greatly reduces the operating cost, and is more suitable for the lower temperature process of sintering flue gas.

Description

technical field [0001] The invention belongs to the technical field of sintering flue gas treatment and relates to a denitrification method suitable for sintering flue gas. Background technique [0002] Flue gas denitrification technology has been widely used in the thermal power generation industry. The SCR catalytic reduction technology using ammonia as the reducing agent is the most mature and widely used, but it is difficult to directly apply it to sintering flue gas. The components of sintering flue gas Complex, NOx concentration fluctuates greatly, flue gas temperature of each bellows varies greatly, flue gas flow rate fluctuates greatly, flue gas dust content is high, and the average concentration of total flue gas summary NOx is low. It is theoretically feasible to heat the sintering flue gas before denitrification, but in practice, the operating cost is high and the enterprise cannot bear it. So far, heating the sintering flue gas and then using SCR denitrification ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/90B01D53/56
CPCB01D53/8653B01D53/865B01D53/90B01D2251/2062B01D2258/0283
Inventor 王永袁玲王飞胡绍伟陈鹏刘芳
Owner ANGANG STEEL CO LTD