Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Denitration system and method for sintering flue gas without ammonia reducing agent

A technology of sintering flue gas and reducing agent, which is applied in the field of sintering flue gas denitrification system without ammonia reducing agent, which can solve the problems of large amount of flue gas, low removal efficiency, and high removal cost of sintering machines, and achieve a reduction in floor space , Simplify the process flow, simplify the effect of process equipment

Inactive Publication Date: 2011-09-21
BAOSTEEL ENG & TECH GRP
View PDF6 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because: the flue gas volume of the sintering machine is large, and the average concentration of NOx is much lower than that of the coal-fired boiler flue gas of the power plant. The cost is prohibitively high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Denitration system and method for sintering flue gas without ammonia reducing agent
  • Denitration system and method for sintering flue gas without ammonia reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0033] The sintering flue gas is heated to a suitable temperature by a heater in front of the dust collector and then sent to the denitration reactor. Since the denitration reactor is equipped with a catalyst layer, the catalytic reduction reaction is carried out to remove NOx under the action of the catalyst, and the removal efficiency can reach 80 % to 90% or even higher, the sintering flue gas after the reaction is discharged into the atmosphere after dust removal and desulfurization.

[0034] In this embodiment, because the denitration reactor is arranged in front of the dust collector, it can save energy, but the amount of iron ore catalyst is larger, so the denitration reactor can be designed as a fluidized bed to realize online catalyst replacement.

[0035] Through research, it is found that CO in the sintering flue gas itself can reduce NOx by 10% to 15% by raising the temperature without a catalyst; using a kind of iron ore as a catalyst, NOx can be reduced under the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a denitration system and method for sintering flue gas without using ammonia as a reducing agent. The system comprises a sintering machine, and a heater, a denitration reactor, a deduster, a blower fan, a desulfurization tower and a chimney sequentially connected with the sintering machine. The denitration reactor is arranged before the deduster; that is, the deduster is arranged between the heater and the denitration reactor. A catalyst layer is provided in the denitration reactor. The method comprises the following steps that: sintering flue gas is heated by the heater to an appropriate temperature before the deduster and is sent to the denitration reactor; NOx is removed by a catalytic reduction in the denitration reactor under the influence of a catalyst, wherein the chemical equation for the removing of NOx is 2NO +2CO =N2 + 2CO2; the reacted sintering flue gas is emitted into the atmosphere after dedusting and desulphurization. According to the invention, the ammonia reducing agent needs not to be added, the catalyst is widely available and cheap, and investment and operation cost needed is low; the reducing agent used in the invention is CO reduction ingredients in the sintering flue gas instead of ammonia, thereby avoiding many problems resulting from the utilization of an ammonia reducing agent.

Description

technical field [0001] The invention relates to emission reduction of nitrogen oxides (NOx) in sintering flue gas, belongs to the technology for reducing emission of nitrogen oxides in sintering flue gas in the field of iron and steel metallurgy, and is a sintering flue gas denitrification system and method without ammonia reducing agent. Background technique [0002] Sintering production is one of the most important process units of modern steel production, and a large amount of air pollutants are produced during the production process, such as particulate matter, NOx, SO 2 , CO, PCDD / F, various heavy metals, etc., are the largest polluters of iron and steel complexes, and also the largest NOx polluters of iron and steel complexes, because sintering NOx emissions usually account for 50% of the total emissions of the entire plant ~60%, excluding captive power plants. At present, the country has listed NOx in the total control index of the "Twelfth Five-Year Plan". Clear re...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01D53/86B01D53/88B01D53/56F23J15/00
Inventor 张传秀吴伟
Owner BAOSTEEL ENG & TECH GRP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com