CN101053749A - Method for removing nitrogen oxide in sintering flue gas - Google Patents

Method for removing nitrogen oxide in sintering flue gas Download PDF

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Publication number
CN101053749A
CN101053749A CNA2007100523269A CN200710052326A CN101053749A CN 101053749 A CN101053749 A CN 101053749A CN A2007100523269 A CNA2007100523269 A CN A2007100523269A CN 200710052326 A CN200710052326 A CN 200710052326A CN 101053749 A CN101053749 A CN 101053749A
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CN
China
Prior art keywords
ammoniation
sinter
nox
nitrogen oxide
sintering
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CNA2007100523269A
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Chinese (zh)
Inventor
翁得明
毕学工
胡立新
熊伟
胡平
周国凡
廖继勇
王素平
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Wuhan Iron and Steel Group Corp
Wuhan University of Science and Engineering WUSE
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Wuhan Iron and Steel Group Corp
Wuhan University of Science and Engineering WUSE
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Application filed by Wuhan Iron and Steel Group Corp, Wuhan University of Science and Engineering WUSE filed Critical Wuhan Iron and Steel Group Corp
Priority to CNA2007100523269A priority Critical patent/CN101053749A/en
Publication of CN101053749A publication Critical patent/CN101053749A/en
Pending legal-status Critical Current

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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Treating Waste Gases (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

The invention discloses a method for desulfurizing nitric oxides in the sintering flue gas, comprising adding ammoniation to the sinter mixture and then sintering. The said ammoniation is distilled waste water or cyanogen and amino group salt of chemical plant such as carbamide, ammonium salt, ammonia and coal plant. The level of addition of said ammoniation is X=n*[(XNOx+XSO#-[2]*2)/m]. The method for desulfurizing nitric oxides in the sintering flue gas in the invention adds low-cost ammoniation to the sinter mixture, transmutes the NOx exhaust in sintering process to be N2 without harm to the environment, and also desulfurizes the SO2 producted in the sintering process at the same time. The method can desulfurize NOx at a lower cost, the desulfurizing ratio of saltpetre can reach to 66.7 percent, and the desulfurizing ratio of SO2 can reach to 80-95 percent.

Description

A kind of method that removes nitrogen oxide in the sinter fume
Technical field
The present invention relates to a kind of method that removes nitrogen oxide, particularly relate to a kind of method that removes nitrogen oxide in the sinter fume.
Background technology
NOx is one of main atmosphere pollution, and is quite serious to the harm of human body, and these pollution factors descend and crop production reduction the growth rate of forest, to metal with contain calcium carbonate building material and cause corrosion, forms acid rain and produces serious air pollution episode.The NOx discharge capacity of sintering plant accounts for more than 50% of long flow process steel plant total release, but does not also have one the NOx in the flue gas handled in China's hundreds of platform sintering machine.
At present, gas denitrifying technology has several classes such as gas-phase reaction method, liquid phase reactor method, absorption method, liquid-film method and microbial method.Gas-phase reaction method is divided into again: (i) electron beam irradiation method and impulse electric corona plasma method; (ii) selective catalytic reduction, SNCR method and red-hot carbon reduction method are under catalysis or on-catalytic condition, use NH 3, reducing agent such as C is reduced to harmless N with NOx 2Method; (iii) low temperature plasma decomposition method.In the above method, impulse electric corona plasma method and decomposition method still are in pilot scale and lab scale stage.The liquid phase absorption process is removed the method for NOx for adopting oxidation, reduction or complexing agent, because NOx solubility is low, so absorptivity is low, and the nitrate of handling in the liquid phase is very difficult.The exhaust gas denitration technology of the at present external actual employing of sintering plant is a selective catalytic reduction, the effect of denitration is fine, the denitration rate can reach about 80%, but shortcoming be invest too high, the investment of one cover exhaust gas denitration system is equivalent to six to seventy percent of a sintering machine investment, add higher catalyst, liquid ammonia usage charges and Operation and Maintenance expense, make pig iron cost raise.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method that removes nitrogen oxide in the sinter fume, effectively to remove the nitrogen oxide in the sinter fume, reduces the denitration cost.
For solving the problems of the technologies described above, the invention provides a kind of method that removes nitrogen oxide in the sinter fume, this method is included in and adds ammoniation in the sinter mixture, carries out sintering afterwards;
Described ammoniation be urea, ammonium salt such as carbonic hydroammonium or ammonium chloride, ammoniacal liquor, coal chemical industry enterprises contain ammonia distillation waste water or cyanogen amide such as cyanamid, be preferably urea and carbonic hydroammonium, preferably select urea for use;
The addition of described ammoniation is X=n * [(X NOx+ X SO2* 2)/and m], the NOx that removes 1 mole needs 1 mole NH 3, remove 1 mole SO 2Need 2 moles NH 3, wherein:
X is the kilomol number of the ammoniation of 100kg sinter mixture needs, kmol;
N=0.5-1.2, the optimum value of n is 0.8, because NH 3Influence the effect of denitration at meeting oxidation generation NO more than 1000 ℃, so should avoid adding excessive ammoniation;
X NOx=N M* 30%/14, wherein, X NOxFor the 100kg sinter mixture is discharged into the kilomol number of the NOx in the waste gas, N MBe the weight content of nitrogen in the 100kg sinter mixture, 30% for nitrogen in the sintering process converts the ratio of NOx to, and the conversion ratio that nitrogen converts NOx in the sintering process is about 30% usually, adopts 30%, 14 to be the molal weight of N at this, g/mol;
X SO2=S M* 90%/32, wherein, X SO2For the 100kg sinter mixture is discharged into SO in the waste gas 2The kilomol number, S MBe the weight content of sulphur in the 100kg sinter mixture, 90% is that sulphur is converted into SO in the sintering process 2Ratio, usually, sulphur is converted into SO in the sintering process 2Conversion ratio be more than 90%, adopt 90%, 32 to be the molal weight of S at this, g/mol;
M is the amino in the ammoniation molecular formula or the quantity of ammonium root.
The above-mentioned method that removes nitrogen oxide in the sinter fume, wherein, the basicity of described sinter mixture is 1.7-1.9, optimum alkalinity is 1.9.The basicity increase helps denitration, can select suitable basicity in conjunction with the demand to sintered products in actual applications.
The method that removes nitrogen oxide in the sinter fume of the present invention adds cheap ammoniation in sinter mixture, the NOx that discharges is converted into the N of environmental sound in sintering process 2, simultaneously also can be with the SO that produces in the sintering process 2Remove, method of the present invention can remove NOx at lower cost, and the denitration rate can reach 66.7%, removes SO simultaneously 2Can reach 80-95%.
The specific embodiment
Preparation 100kg sinter mixture, wherein N M=0.024kg, S M=0.065kg.
Embodiment 1
Get the above-mentioned sinter mixture for preparing of 100kg, n=0.5, adopt and analyze pure urea as ammoniation, calculate the addition of required urea, take by weighing urea, it is dissolved in the water according to calculated value, be mixed in the raw materials for sintering then, compound is fetched water, mixed again 2 minutes, the sintering of lighting a fire in the sintered cup of then compound being packed into.
The concentration of NOx in whole sintering process in the on-line determination sintered discharge gas, calculating sintered discharge gas denitration rate by the NOx concentration curve is 45.21%.
Embodiment 2
Get the above-mentioned sinter mixture for preparing of 100kg, n=0.8, adopt and analyze pure urea as ammoniation, calculate the addition of required urea, take by weighing urea, it is dissolved in the water according to calculated value, be mixed in the raw materials for sintering then, compound is fetched water, mixed again 2 minutes, the sintering of lighting a fire in the sintered cup of then compound being packed into.
The concentration of NOx in whole sintering process in the on-line determination sintered discharge gas, calculating sintered discharge gas denitration rate by the NOx concentration curve is 63.32%.
Embodiment 3
Get the above-mentioned sinter mixture for preparing of 100kg, n=1.2, adopt and analyze pure urea as ammoniation, calculate the addition of required urea, take by weighing urea, it is dissolved in the water according to calculated value, be mixed in the raw materials for sintering then, compound is fetched water, mixed again 2 minutes, the sintering of lighting a fire in the sintered cup of then compound being packed into.
The concentration of NOx in whole sintering process in the on-line determination sintered discharge gas, calculating sintered discharge gas denitration rate by the NOx concentration curve is 20.05%.
Embodiment 4
Get the above-mentioned sinter mixture for preparing of 100kg, n=0.8, adopt carbonic hydroammonium as ammoniation, calculate the addition of required carbonic hydroammonium, take by weighing carbonic hydroammonium, it is dissolved in the water according to calculated value, be mixed in the raw materials for sintering then, compound is fetched water, mixed again 2 minutes, the sintering of lighting a fire in the sintered cup of then compound being packed into.
The concentration of NOx in whole sintering process in the on-line determination sintered discharge gas, calculating sintered discharge gas denitration rate by the NOx concentration curve is 66.7%.
Embodiment 5
Get the above-mentioned sinter mixture for preparing of 100kg, n=1.0, adopt ammoniacal liquor as ammoniation, calculate the addition of required ammoniacal liquor, take by weighing ammoniacal liquor according to calculated value, it is mixed in the raw materials for sintering, compound is fetched water, mixed the sintering of lighting a fire in the sintered cup of then compound being packed into again 2 minutes.
The concentration of NOx in whole sintering process in the on-line determination sintered discharge gas, calculating sintered discharge gas denitration rate by the NOx concentration curve is 58.51%.
Embodiment 6
Get the above-mentioned sinter mixture for preparing of 100kg, n=0.8, adopt cyanamid as ammoniation, calculate the addition of required cyanamid, take by weighing cyanamid, it is dissolved in the water according to calculated value, be mixed in the raw materials for sintering then, compound is fetched water, mixed again 2 minutes, the sintering of lighting a fire in the sintered cup of then compound being packed into.
The concentration of NOx in whole sintering process in the on-line determination sintered discharge gas, calculating sintered discharge gas denitration rate by the NOx concentration curve is 60.77%.
Embodiment 7
Get the above-mentioned sinter mixture for preparing of 100kg, n=0.8, employing contains the Coking Plant Wastewater of ammonia as ammoniation, calculate required ammonia-containing water addition, take by weighing ammonia-containing water according to calculated value, it is mixed in the raw materials for sintering, compound is fetched water, mixed the sintering of lighting a fire in the sintered cup of then compound being packed into again 2 minutes.
The concentration of NOx in whole sintering process in the on-line determination sintered discharge gas, calculating sintered discharge gas denitration rate by the NOx concentration curve is 55.13%.
Embodiment 8
Preparation 100kg basicity is 1.7 sinter mixture, wherein N M=0.024kg, S M=0.065kg, adopt and analyze pure urea as ammoniation, n gets 1.2, calculate the addition of required urea, take by weighing urea, it is dissolved in the water according to calculated value, be mixed in the raw materials for sintering then, compound is fetched water, mixed again 2 minutes, the sintering of lighting a fire in the sintered cup of then compound being packed into.
The concentration of NOx in whole sintering process in the on-line determination sintered discharge gas, calculating sintered discharge gas denitration rate by the NOx concentration curve is 20.05%.
Embodiment 9
Preparation 100kg basicity is 1.8 sinter mixture, wherein N M=0.022kg, S M=0.066kg, adopt and analyze pure urea as ammoniation, n gets 1.2, calculate the addition of required urea, take by weighing urea, it is dissolved in the water according to calculated value, be mixed in the raw materials for sintering then, compound is fetched water, mixed again 2 minutes, the sintering of lighting a fire in the sintered cup of then compound being packed into.
The concentration of NOx in whole sintering process in the on-line determination sintered discharge gas, calculating sintered discharge gas denitration rate by the NOx concentration curve is 31.13%.
Embodiment 10
Preparation 100kg basicity is 1.9 sinter mixture, wherein N M=0.021kg, S M=0.068kg, adopt and analyze pure urea as ammoniation, n gets 1.2, calculate the addition of required urea, take by weighing urea, it is dissolved in the water according to calculated value, be mixed in the raw materials for sintering then, compound is fetched water, mixed again 2 minutes, the sintering of lighting a fire in the sintered cup of then compound being packed into.
The concentration of NOx in whole sintering process in the on-line determination sintered discharge gas, calculating sintered discharge gas denitration rate by the NOx concentration curve is 58.33%.

Claims (8)

1, a kind of method that removes nitrogen oxide in the sinter fume is characterized in that, this method is included in and adds ammoniation in the sinter mixture, carries out sintering afterwards;
Described ammoniation is that the ammonia that contains of urea, ammonium salt, ammoniacal liquor, coal chemical industry enterprises distills waste water or cyanogen amide;
The addition of described ammoniation is X=n * [(X NOx+ X SO2* 2)/m],
Wherein, X is the kilomol number of the ammoniation of 100kg sinter mixture needs, kmol;
n＝0.5-1.2；
X NOx=N M* 30%/14, wherein, X NOxFor the 100kg sinter mixture is discharged into NOx kilomol number in the waste gas, N MBe the weight content of nitrogen in the 100kg sinter mixture, 30% is the ratio that nitrogen converts NOx in the sintering process, and 14 is the molal weight of N, g/mol;
X SO2=S M* 90%/32, wherein, X SO2For the 100kg sinter mixture is discharged into SO in the waste gas 2The kilomol number, S MBe the weight content of sulphur in the 100kg sinter mixture, 90% is that sulphur is converted into SO in the sintering process 2Ratio, 32 is the molal weight of S, g/mol;
M is the amino in the ammoniation molecular formula or the quantity of ammonium root.
2, the method that removes nitrogen oxide in the sinter fume as claimed in claim 1 is characterized in that, described ammoniation is a urea.
3, the method that removes nitrogen oxide in the sinter fume as claimed in claim 1 is characterized in that, described ammonium salt is carbonic hydroammonium or ammonium chloride.
4, the method that removes nitrogen oxide in the sinter fume as claimed in claim 3 is characterized in that, described ammonium salt is a carbonic hydroammonium.
5, the method that removes nitrogen oxide in the sinter fume as claimed in claim 1 is characterized in that, described cyanogen amide is a cyanamid.
6, the method that removes nitrogen oxide in the sinter fume as claimed in claim 1 is characterized in that n=0.8.
7, as claim 1 or the 6 described methods that remove nitrogen oxide in the sinter fume, it is characterized in that the basicity of described sinter mixture is 1.7-1.9.
8, the method that removes nitrogen oxide in the sinter fume as claimed in claim 7 is characterized in that, the basicity of described sinter mixture is 1.9.
CNA2007100523269A 2007-05-30 2007-05-30 Method for removing nitrogen oxide in sintering flue gas Pending CN101053749A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103691271A (en) * 2013-12-16 2014-04-02 山东大学 Simultaneous gas-phase desulfurization and denitration method for smoke gas
CN104353332A (en) * 2014-10-22 2015-02-18 天津中材工程研究中心有限公司 Auxiliary for reducing cement denitration urea consumption
CN113801498A (en) * 2021-10-13 2021-12-17 中国科学院过程工程研究所 Clean roasting modification method for vanadium-containing shale
CN115893352A (en) * 2023-01-09 2023-04-04 北京林立新能源有限公司 Method for preparing manganese phosphate from manganous ions

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103691271A (en) * 2013-12-16 2014-04-02 山东大学 Simultaneous gas-phase desulfurization and denitration method for smoke gas
CN103691271B (en) * 2013-12-16 2016-01-13 山东大学 A kind of flue gas gas phase desulfurization denitration method simultaneously
CN104353332A (en) * 2014-10-22 2015-02-18 天津中材工程研究中心有限公司 Auxiliary for reducing cement denitration urea consumption
CN113801498A (en) * 2021-10-13 2021-12-17 中国科学院过程工程研究所 Clean roasting modification method for vanadium-containing shale
CN115893352A (en) * 2023-01-09 2023-04-04 北京林立新能源有限公司 Method for preparing manganese phosphate from manganous ions

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Open date: 20071017