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A system and method for flue gas purification and waste heat utilization

A flue gas purification and flue gas technology, applied in chemical instruments and methods, separation methods, lighting and heating equipment, etc., can solve the problem of inability to effectively solve the problem of dioxin resynthesis, the degree of waste heat utilization and the depth of purification are not ideal, etc. problems, to achieve the effect of inhibiting resynthesis, saving power consumption and reducing costs

Active Publication Date: 2021-11-02
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although many flue gas purification and preheating utilization systems and related processes have been disclosed in the prior art, it is still unable to effectively solve the problem of resynthesis of dioxins in the process of deep flue gas purification. In addition, the degree of waste heat utilization and purification depth are not sufficient. very ideal

Method used

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  • A system and method for flue gas purification and waste heat utilization

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Effect test

Embodiment 1

[0085] This embodiment provides a flue gas purification and waste heat utilization method, using a flue gas purification and waste heat utilization system provided in a specific embodiment to perform deep purification of flue gas and multi-effect utilization of flue gas waste heat. Described method specifically comprises the steps:

[0086] S1 The air induction device 7 draws out the flue gas produced by the fourth hole of the electric furnace 1, and the flue gas flow rate is 200,000m 3 / h, the temperature of the flue gas is 1200°C, and the flue gas discharged from the fourth hole of the electric furnace 1 includes dust, CO, NO x or a combination of one or at least two of dioxins, wherein the dust concentration is 10g / m 3 , the CO concentration is 1%, the content of dioxin is 2ng-TEQ / m 3 , NO x The content is 200ppm, and the ammonia injection device sprays ammonia into the flue gas for SNCR reaction to remove 50% of NO in the flue gas x , the injected ammonia and the NO in...

Embodiment 2

[0094] This embodiment provides a flue gas purification and waste heat utilization method, using a flue gas purification and waste heat utilization system provided in a specific embodiment to perform deep purification of flue gas and multi-effect utilization of flue gas waste heat. Described method specifically comprises the steps:

[0095] S1 The air induction device 7 draws out the flue gas produced by the fourth hole of the electric furnace 1, and the flue gas flow rate is 250000m 3 / h, the temperature of the flue gas is 1250°C, and the flue gas discharged from the fourth hole of the electric furnace 1 includes dust, CO, NO x Or one or a combination of at least two of dioxins, wherein the dust concentration is 13g / m 3 , the CO concentration is 5%, and the content of dioxin is 4ng-TEQ / m 3 , NO x The content is 700ppm, and the ammonia injection device sprays ammonia into the flue gas for SNCR reaction to remove 55% of NO in the flue gas x , the injected ammonia and the NO...

Embodiment 3

[0103] This embodiment provides a flue gas purification and waste heat utilization method, using a flue gas purification and waste heat utilization system provided in a specific embodiment to perform deep purification of flue gas and multi-effect utilization of flue gas waste heat. Described method specifically comprises the steps:

[0104] S1 The air induction device 7 draws out the flue gas produced by the fourth hole of the electric furnace 1, and the flue gas flow rate is 300,000m 3 / h, the temperature of the flue gas is 1300°C, and the flue gas discharged from the fourth hole of the electric furnace 1 includes dust, CO, NO x Or one or a combination of at least two of dioxins, wherein the dust concentration is 15g / m 3 , the CO concentration is 10%, and the content of dioxin is 6ng-TEQ / m 3 , NO x The content is 1200ppm, and the ammonia injection device sprays ammonia into the flue gas for SNCR reaction to remove 60% of NO in the flue gas x , the injected ammonia and the...

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Abstract

The present invention provides a flue gas purification and waste heat utilization system and method. The system includes a flue gas discharge unit, a first-level waste heat utilization unit, a first-level flue gas purification unit, and a second-level waste heat utilization unit connected in sequence along the flue gas flow direction. and a secondary flue gas purification unit, the primary flue gas purification unit is used to remove NO in the flue gas x , large particles and CO, the secondary flue gas purification unit is used to remove NO in the flue gas x and dioxin; the ammonia spraying device is externally connected between the flue gas discharge unit and the primary waste heat utilization unit, and the ammonia spraying device is used to inject ammonia gas into the flue gas discharged from the flue gas discharge unit. By injecting NH into the flue gas 3 , both to achieve the removal of NO x At the same time, it effectively inhibits the resynthesis of dioxins in the waste heat boiler, and realizes the collaborative purification of pollutants. The process route provided by the invention realizes the coupling of pollutant emission reduction and energy saving effect, and meets the current national policy requirements.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and relates to a flue gas purification and waste heat utilization system and method, in particular to a flue gas deep purification and waste heat multi-effect utilization system and method. Background technique [0002] Electric furnace steelmaking is the fourth largest source of dioxin emissions in my country. Dioxin is the most toxic substance known in the world, and its toxicity is 1,000 times that of potassium cyanide. The steel production capacity of electric furnace steelmaking in my country currently accounts for about In recent years, the state has actively encouraged the development of electric arc furnace steelmaking. It is planned that by the end of 2025, the proportion of electric furnace steel will increase to 20%, and the power consumption of electric furnace smelting will be reduced by 10%. On the one hand, the increase in the production of electric furnace steel will ine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D17/00B01D53/90B01D53/86B01D53/70
CPCF27D17/004F27D17/008F27D17/003B01D53/90B01D53/8631B01D53/8662B01D53/70F27D2017/006B01D2258/0283B01D2257/2064Y02P10/25F27D17/001B01D53/8646B01D53/56B01D2251/2062B01D2257/404B01D2257/502B01D2258/025B01D2257/702B01D53/343B01D53/869
Inventor 朱廷钰杨阳徐文青
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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