Supercharge Your Innovation With Domain-Expert AI Agents!

Method for reducing NOx by sintering

A technology for sintering mixture and quality, which is applied in the field of NOx reduction by sintering, and can solve the problems of limited reduction range and limited NOx reduction range.

Inactive Publication Date: 2019-03-01
ZENITH STEEL GROUP CORP
View PDF6 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The predecessors have studied the use of gaseous fuels such as natural gas, coke oven gas and other gaseous fuels to replace solid fuels, and have also taken a large number of measures to improve ore blending and processes, such as adding magnetite powder and implementing thick material layers to reduce the consumption of solid fuels. But the final reduction of solid fuel is limited, basically at the lowest level of 40-45kg / t, therefore, the reduction of NOx is limited, and the basic sintering flue gas NOx content is at the level of 200-300mg / Nm3

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
  • Method for reducing NOx by sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] see figure 1 The embodiment of the present invention provides a method for reducing NOx by sintering, the steps of which include batching, mixing and granulation, distribution and ignition, sintering, cooling and screening after the sintering process, and NOx detection.

[0016] (1) Sintering mixture ingredients (the following proportions are all mass percentages):

[0017] The proportion of iron ore powder is 60%, the proportion of quicklime is 5%, the proportion of limestone is 0%, the proportion of dolomite is 7%, the proportion of coke powder is 2%, the proportion of iron powder is 10%, and the proportion of returned ore is 16%.

[0018] (2) Mixing and granulation: The selected sintering mixture components are mixed and wetted by a cylinder mixer and granulated by a cylinder mixer twice, and an appropriate amount of water is added for mixing and granulation.

[0019] The total amount of water added in the process of mixing wetting and mixing granulation is 7.0% of ...

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

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for reducing NOx by sintering. The method includes the steps of dosing, mixing evenly, granulation, distribution, ignition, sintering, cooling, screening and NOx detection. The method for reducing the NOx by sintering aims to reduce the NOx by adjusting sintering ingredients and specifically includes increasing the proportion of iron powder, reducing the fuel ratioand controlling the ratio of the iron powder and the fuel, assisted by control of appropriate sintering process parameters. The oxidative heat release of the iron powder in the sintering process replaces the combustion heat release of the fuel in the conventional sintering, and finally emission reduction of the sintering NOx is achieved while the ore is sintered. The process can achieve the significant emission reduction of the NOx without changing the current sintering process by only changing the ingredients and some process parameters.

Description

technical field [0001] The invention belongs to the field of sintering emission reduction, in particular to a method for reducing NOx by sintering. The purpose is to reduce NOx emissions by adjusting the sintering ingredients, replace the heat release of fuel in traditional sintering by the oxidation of iron powder in the sintering process, and finally realize the reduction of sintering NOx while making sintering ore. Background technique [0002] As a major pollutant emitter in the steel industry, sintering contributes about 50% of NOx emissions. Moreover, sintering NOx emissions belong to fuel-type NOx, 90% of which are brought by the fuel used in sintering. Since sintering belongs to liquid-phase bonded mineralization, the use of fuel is inevitable, and the proportion of solid fuel in traditional sintering process is basically 3-5%. The predecessors have studied the use of gaseous fuels such as natural gas, coke oven gas and other gaseous fuels to replace solid fuels, a...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C22B1/24
CPCC22B1/16C22B1/2406
Inventor 裴元东张俊杰陈军召盛建华李国良刘桐张天啸管振列张巧玉李乾坤夏强
Owner ZENITH STEEL GROUP CORP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com