Method for preparing coal burning fume mercury-removing adsorbent

A coal-fired flue gas and adsorbent technology, which is applied in the field of preparation of a mercury-removing adsorbent for coal-fired flue gas, can solve the problems of no mercury removal, high removal difficulty, low resistivity of fly ash, etc. Easy to promote, simple and practical effect

Inactive Publication Date: 2005-09-21
ZHEJIANG UNIV
View PDF0 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fly ash produced by coal combustion can absorb mercury in the flue gas. Fly ash with high carbon content is very beneficial to the adsorption of mercury. However, some scientists believe that greatly increasing the carbon content of fly ash cannot correspondingly increase the Ability to adsorb mercury
Furthermore, fly ash with high carbon content has low resistivity, which will reduce the dust removal efficiency of ESP
But in general, the removal rate of these adsorbents to the total mercury in the flue gas of coal-fired power plant boilers is too low to be widely used.
[0009] At present, mercury pollution control technology has been applied in the waste incinerator industry in foreign countries, but my country has no industrial equipment for removing mercury from flue gas.
In view of the low concentration of mercury in coal-fired flue gas and the difficulty of removal, foreign technologies in this field are in the stage of industrial testing and pilot testing, and have not yet been widely promoted.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 2000ml deionized water, add 20ml concentrated H 2 SO 4 , adding 27.6 g KMnO 4 Stir to make it dissolve completely, put 94 grams of 50% Mn (NO 3 ) 2 Slowly add 1000 grams of activated carbon, continue to stir for 30 minutes, dry in an oven at 100°C, and then grind it into powder for use. For a coal-fired boiler, the flue gas output is about 6×10 5 N m 3 / h, the total mercury content in the flue gas produced is about 3.8μg / Nm 3 . When the flue gas temperature is 150°C, spray this kind of MnO into the flue gas 2 Impregnated modified activated carbon adsorbent, the injection amount is C / Hg 12000, so that the elemental mercury in the flue gas can be converted into Hg 2 MnO 2 This adsorption process is a relatively strong chemical adsorption process, and a new compound Hg is generated after adsorption. 2 MnO 2 :

[0022]

[0023] Mercury is in a low-valence state in this compound, and electrons are transferred from mercury to manganese inside the compo...

Embodiment 2

[0025] Take 2000ml deionized water, add 20ml concentrated H 2 SO 4 , adding 27.6 g KMnO 4 Stir to make it dissolve completely, put 94 grams of 50% Mn (NO 3 ) 2 Slowly add 1,000 grams of vermiculite fine powder, continue to stir for 30 minutes, dry in an oven at 100°C, and then grind it into powder for use. For a coal-fired boiler, the flue gas output is about 6×10 5 N m 3 / h, the total mercury content in the flue gas produced is about 4.2μg / Nm 3 . When the flue gas temperature is 150°C, spray this kind of MnO into the flue gas 2 Impregnate the modified vermiculite, the injection amount is vermiculite / mercury 16000, so that the mercury in the flue gas can be converted into Hg 2 MnO 2And be solidified. Then all the particulate matter is collected by the bag dust removal equipment, and 30% of the total collection is sent back to the flue through the return device, and the content of total mercury in the flue gas after the dust collector is reduced to 0.38-0.41μg / Nm 3 ,...

Embodiment 3

[0027] Take 2000ml deionized water, add 20ml concentrated H 2 SO 4 , adding 31.6 g KMnO 4 Stir to dissolve it completely, add 45.3 g of MnSO 4 Slowly add 1000 grams of activated carbon, continue to stir for 30 minutes, dry in an oven at 100°C, and then grind it into powder for use. For a coal-fired boiler, the flue gas output is about 6×10 5 N m 3 / h, the total mercury content in the flue gas produced is about 3.5μg / Nm 3 . When the flue gas temperature is 150°C, spray this kind of MnO into the flue gas 2 Impregnated modified activated carbon adsorbent, the injection amount is C / Hg 13000, so that the elemental mercury in the flue gas can be converted into Hg 2 MnO 2 And be solidified. Then all the particulate matter is collected by bag dust removal equipment, and 26% of the collected total amount is sent back to the flue through the return device, and the content of total mercury in the flue gas after the dust collector is reduced to 0.33-0.35μg / Nm 3 , the total remov...

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 discloses a method for preparing a coal smoke Hg-removing adsorbent, which comprises the following steps: a) adding the dipping acid into the water whose quantity is 1-2% of the water, b) adding the heptad manganese solid or solution to the liquor and stirring them to dissolve the manganese, c) adding acid diatomic manganese solution and stirring at the same time, d) adding the granular adsorbent and stirring 30-40 minutes, e) heating and drying them to the solid in the temperature 80-100 Deg.c, them grinding the solid to the powder, wherein the adding mass ratio of the heptad manganese, diatomic manganese and the granular adsorbent is 1: 1-2: 35-50.

Description

technical field [0001] The invention relates to a preparation method of an adsorbent for removing mercury from coal-fired flue gas. Background technique [0002] Mercury is not a necessary substance in the life activities of organisms, but it has strong and persistent toxicity to higher organisms. All countries pay great attention to the research on mercury pollution. The source of environmental mercury pollution is mainly human-made mercury pollution. Mercury is one of the trace heavy metal elements in coal. Due to the massive combustion of coal, the mercury released from coal burning in the world accounts for a large part of the mercury released by human activities. According to the New Jersey Environmental Protection Organization (NJ DEPE) ( 1993) statistics show that the average content of mercury in coal is in the range of 0.12-0.28mg / kg. my country is a big country of energy consumption. In my country's total energy consumption, coal accounts for more than 75%, and mo...

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): B01D53/02B01D53/64B01J20/02
Inventor 骆仲泱周劲松王勤辉岑可法方梦祥高翔施正伦倪明江程乐鸣王树荣余春江
Owner ZHEJIANG UNIV
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