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

Technology for efficiently removing NOx pollutants in smoke

A flue gas and process technology, which is applied in the field of oxidation and absorption process, can solve the problems of large difference and achieve the effect of low operating cost, high oxidation absorption effect and easy source

Inactive Publication Date: 2013-07-17
BEIJING UNIV OF CHEM TECH
View PDF0 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the oxidation absorption method has improved the efficiency of wet denitrification to a certain extent, compared with the efficiency of dry denitrification, there is still a big difference.

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
  • Technology for efficiently removing NOx pollutants in smoke

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Example 1: Under the intake conditions of about 90% nitrogen and about 10% oxygen, using sodium chlorite with a mass concentration of 1% as an oxidant and sodium sulfite with a mass concentration of 10% as an absorbent, the measured NO X The concentration was reduced from 57ppm to 12ppm, and the denitrification efficiency was 78.9%.

example 2

[0020] Example 2: The reaction of calcium hydroxide with a mass concentration of 3.35% and sodium sulfate with a mass concentration of 6.5% is used to regenerate sodium hydroxide and filter. Feed SO containing 4000ppm into the filtrate 2 The gas, adjust the pH of the solution to 7-8, at this moment the mass concentration of sodium sulfite in the solution is about 3%. Take this solution as absorbent, and sodium chlorite with a mass concentration of 1% is used as oxidant, and two sets of data are measured under the inlet conditions of about 90% nitrogen and about 10% oxygen: imported NO X From 55ppm to 11ppm at the outlet, the denitrification efficiency is 80.0%.

[0021] From the above examples, it can be seen that the denitrification efficiency of this process is very high, the regeneration effect of sodium hydroxide is better, and the absorption efficiency of the absorbent generated by the regenerated sodium hydroxide is almost not reduced.

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
Denitrification efficiencyaaaaaaaaaa
Login to View More

Abstract

The invention provides a denitration technology for efficiently removing NOx in a smoke. The technology comprises the following steps: oxidizing NOx in the smoke by adopting a sodium chlorite solution as an oxidant, and processing NOx in the smoke by using a sodium sulfite solution as an absorbent to realize a removal rate of above 75%. The absorbent is prepared through reacting sulfur dioxide in the smoke with sodium hydroxide, and a solution subjected to absorption reacts with calcium hydroxide to generate a sodium hydroxide solution which can be used for afresh preparing the absorbent. The technology well reduces the NOx absorption cost, and is a smoke denitration technology having the advantages of high efficiency and low cost.

Description

Technical field [0001] The invention relates to a process for denitrification of industrial flue gas, in particular to an oxidation absorption process with lower cost and higher denitrification efficiency. Background technique [0002] With the seriousness of industrial pollution and the enhancement of human awareness of environmental protection, NO in industrial waste gas X The removal of NO has been paid more and more attention by various countries, and our country also reduced NO in 2010 X As a binding index, it is included in the scope of regional total control, and the total control is implemented nationwide. The current flue gas denitrification technology can be divided into two categories: dry method and wet method. The dry NOx removal technology includes SCR, SNCR and other processes, and the wet method is to wash the flue gas with an absorbent solution to purify the flue gas, so as to remove NO X the goal of. The wet method, that is, the liquid absorption method...

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): B01D53/56B01D53/60B01D53/78
CPCY02A50/20
Inventor 童华刘兆斌吴丽莎
Owner BEIJING UNIV OF CHEM TECH
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