Method for simultaneously removing SO2 and NO in flue gas by biological reduction and complexing absorption

A complex absorption and SO32- technology, which is applied in the field of flue gas purification, can solve the problems that the recycling of absorption liquid cannot be realized, hinder the application of technology, and difficult to regenerate, so as to achieve comprehensive treatment, no secondary pollution, investment and operating costs. less effect

Active Publication Date: 2008-12-24
DALIAN UNIV OF TECH
View PDF3 Cites 32 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has major disadvantages: one is that the product Fe after absorption II The regeneration of (EDTA)-NO is difficult, and the second is the oxygen in the flue gas and its easy conversion of Fe II (EDTA) is oxidized to Fe III (EDTA), while Fe III (EDTA) does not absorb NO
H

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 simultaneously removing SO2 and NO in flue gas by biological reduction and complexing absorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A 75t / h coal-fired thermoelectric boiler with a flue gas flow rate of 100,000 Nm 3 / h,SO 2 The content is 1000mg / Nm 3 , NO content is 500mg / Nm 3 , the flue gas temperature is 130°C, according to the process of the present invention, when leaving the absorption tower, the SO in the absorption tail gas 2 Content 100mg / Nm 3 , NO content is 75mg / Nm 3 , the desulfurization efficiency is 90%, and the denitrification efficiency is 85%.

[0025] The absorption tower is a spray tower with a diameter of 3.5m, a height of 22m, and a liquid-gas ratio of 6L / Nm 3 , the residence time of the absorption liquid in the circulating reaction pool is 5min, the desulfurization alkaline absorption liquid is prepared with NaOH during the absorption process, and the denitrification complexing agent is Fe II (EDTA).

[0026] The anaerobic bioreactor is an upflow anaerobic reactor UASB, the pH value is controlled at 7.0, the temperature is controlled at 32°C, and the residence time is 30 h...

Embodiment 2

[0029] A 220t / h coal-fired thermoelectric boiler with a flue gas flow rate of 250,000 Nm 3 / h,SO 2 The content is 800mg / Nm 3 , NO content is 400mg / Nm 3 , the flue gas temperature is 150°C, according to the process of the present invention, when leaving the absorption tower, the SO in the absorption tail gas 2 Content 80mg / Nm 3 , NO content is 60mg / Nm 3 , the desulfurization efficiency is 90%, and the denitrification efficiency is 85%.

[0030] The absorption tower is a spray tower with a diameter of 6m, a height of 25m, and a liquid-gas ratio of 6L / Nm 3 , the residence time of the absorbing liquid in the circulating reaction pool is 5min, and the desulfurization alkaline absorbing liquid in the absorption process uses Na 2 CO 3 Preparation, the denitrification complexing agent is Fe II (NTA).

[0031] The anaerobic bioreactor is an upflow anaerobic reactor UASB, the pH value is controlled at 7.0, the temperature is controlled at 35°C, and the residence time is 28 hour...

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 present invention belongs to the smoke purification technical field, and discloses a method for deoxidizing integrating, complexing and absorbing the organism and removing SO2 and No in the smoke, which is characterized in that alkaline absorption solution containing the ferrous-iron complexing agent Fe<II>(L) is arranged inside an absorption tower; SO2 is neutralized in the absorption solution, and NO is absorbed by the complexing iron; the smoke is exhausted from the top of the absorption tower; the absorption tail solution enters into an anaerobic reactor, and SO3<2> or SO4<2> in the tail solution is deoxidized to sulfide by sulfate reducting bacteria; the sulfide deoxidizes Fe<II>(L)-NO, Fe<III>(L) and other N-S compound in the tail solution to Fe<II>(L) and N2; at the same time, the sulfide is oxidized to simple sulfur; the absorption tail solution containing the Fe<II>(L) is directly returned to the smoke absorption tower to be used as desulphurization denitration absorption solution. The method of the present invention has the advantages that the micro-organism smoke desulphurization method and the complexing absorption smoke denitration method are combined, so that the sulfur dioxide and the nitrogen oxide can be synchronically removed, and the sulfur resource can be recycled; the complexing iron absorption agent can be cycled for use.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and relates to a method for simultaneously removing SO in flue gas through biological reduction combined with complexation absorption 2 and NO method. Background technique [0002] With the intensification of environmental pollution, how to economically and effectively control SO in coal combustion 2 The emission of NO and NO is the focus of energy and environment field all over the world. At present, there is no relatively mature and stable treatment process for simultaneous desulfurization and denitrification of flue gas. Most of them adopt separate treatment processes, which not only occupy a large area, complex equipment, are prone to corrosion and scaling, but also have high investment and operating costs. Therefore, the wet simultaneous desulfurization and denitrification technology with simple development technology, low operating cost, usable by-products and good operating...

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): B01D53/60B01D53/75B01D53/84
CPCY02A50/20
Inventor 张玉周集体王玉
Owner DALIAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap