CN205379785U - NOx changes N2's device into among flue gas denitration - Google Patents

NOx changes N2's device into among flue gas denitration Download PDF

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Publication number
CN205379785U
CN205379785U CN201521122279.7U CN201521122279U CN205379785U CN 205379785 U CN205379785 U CN 205379785U CN 201521122279 U CN201521122279 U CN 201521122279U CN 205379785 U CN205379785 U CN 205379785U
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CN
China
Prior art keywords
flue gas
spray column
absorption tower
nox
oxidation unit
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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CN201521122279.7U
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Chinese (zh)
Inventor
姚学民
金国良
刘娟
高丹丹
方洲
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HANGZHOU ZHONGBING ENVIRONMENTAL PROTECTION CO Ltd
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HANGZHOU ZHONGBING ENVIRONMENTAL PROTECTION CO Ltd
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Priority to CN201521122279.7U priority Critical patent/CN205379785U/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02CCAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00Capture or disposal of greenhouse gases
    • Y02C20/10Capture or disposal of greenhouse gases of nitrous oxide (N2O)

Abstract

The utility model discloses a NOx changes N2's device into among flue gas denitration and method belong to environmental protection waste gas pollution control and treatment field. Including ozone generator, fan, half oxidation unit, spray column, absorption tower, ozone generator pass through the fan be connected to half oxidation unit, half oxidation unit be connected to the spray column, the spray column be connected to the absorption tower. O3 fresh air in coordination carries to half oxidation unit together, and only half is NO2 by the oxidation to the NO in the flue gas, has saved O3's consumption, NO and NO2 generate nitrite in the spray column, adopt urea directly to convert nitrite into N2, have solved a nitrate concentration difficult problem too big, hard to manage that generates among the prior art, the utility model discloses NOx changes N2's device into among flue gas denitration has realized with the method that the O3 consumption is few, the investment running cost is low, and denitration efficiency is high, no secondary pollutant discharges.

Description

In a kind of denitrating flue gas, NOx conversion becomes the device of N2
Technical field
This utility model relates to environmental project waste gas pollution control and treatment field, becomes N particularly to NOx conversion in a kind of denitrating flue gas2Device.
Background technology
Thermal power plant, garbage burning factory, cement plant are in burning process process, the NOx gas generated due to the oxidation of nitrogen, there are stimulation human respiratory, infringement animals and plants, damage the ozone layer, cause greenhouse effect, acid rain and photochemically reactive feature, wherein in the majority with NO, and it extremely difficult is dissolved in water, increase the difficulty of waste gas pollution control and treatment.
At present, the major technique of denitrating flue gas has: SCR technology (SCR), SNCR technology (SNCR), SNCR technical tie-up SCR technology (SNCR/SCR), plasma denitration technology, wet flue gas denitration technology etc..
The know-why of SCR technology (SCR) is to spray into ammonia in the tail gas containing NOx, carbamide or other nitrogen-containing compound so that it is in NOx be reduced into N2And water, the temperature range of this process is in 315 400 DEG C, and needs catalyst.This treatment technology denitration efficiency is high, up to more than 90%;But after this technology is built in boiler economizer, floor space is relatively big, and the consumption of catalyst is big, catalyst is easily poisoning, cost of investment and operating cost are higher.
The know-why of SNCR technology (SNCR) is to spray into ammonia in the tail gas containing NOx, carbamide or other nitrogen-containing compound so that it is in NOx be reduced into N2And water, reduction reaction carries out in higher temperature range (870 1100 DEG C), it is not necessary to catalyst.This method does not need catalyst, and engineering cost is substantially reduced;It is arranged on boiler body, it is not necessary to floor space.But the utilization rate of this technology ammonia is not high, often use excess of ammonia to reduce NOx, it is easy to form the escaping of ammonia, cause equipment corrosion contaminated environment, form greenhouse gases N2O;The improper burning that also can affect hot coal charcoal of running-course control, thus causing more CO to discharge.
SCR technical tie-up SNCR technology (SNCR/SCR) has two reaction zones, first by ammonia, the reducing agent of carbamide or other nitrogen-containing compound sprays into first reaction zone, and at high temperature, reducing agent and the NOx in flue gas occur non-catalytic reduction to react;Then again the reducing agent of non-complete reaction is entered second reaction zone, further denitrogenation, save the ammonia spraying system being arranged in flue, and decrease the consumption of catalyst;But this technical operation process control is complicated, and the utilization in large scale industry is less.
Plasma denitration technology is to utilize high energy electron by the molecular activation in 60 100 DEG C of flue gases, electronics cracks, generate a large amount of ion, free radical and electronics isoreactivity particle, by the NOX oxidation in flue gas, reacting generation ammonium nitrate with the ammonia sprayed into, technique is simple simultaneously, by-product can as fertilizer selling, but power consumption is big, and electrode life is short, expensive.
Wet flue gas denitration technology is to include Chlorine Dioxide Oxidation technology, hydrogen peroxide oxidation technology, potassium permanganate oxidation technology, ozonation technology etc..Chlorine Dioxide Oxidation technology is to adopt NaClO2/ NaClO aoxidizes NO, then adopts the sour gas more than NaOH absorption of residual again, and denitration efficiency is high, but solvent-oil ratio is big, cost intensive;Hydrogen peroxide oxidation technology adopts hydrogen peroxide oxidation NO, and then adopts alkaline solution absorption, equally exists solvent-oil ratio big, the problem of cost intensive;Potassium permanganate oxidation technology adopts the method that alkaline permanganate solution absorbs NOx, denitration efficiency is high, absorb the content of KOH in liquid and the elimination of NOx is had material impact, KOH reduces the Strong oxdiative ability that will restrict potassium permanganate too soon, reduce the ability of potassium permanganate oxidation NOx, thus causing that the treatment effect of waste gas reduces.
Ozonation technology adopts the NO in strong oxidizer ozone oxidation flue gas, and NO is rapidly converted into NO2, then adopt absorbent to absorb again;Owing to ozone has extremely strong oxidisability, NO is converted into NO2Efficiency high, be the denitration technology of a kind of great prospect.But have that ozone consumption is big, cost is high;NO2Being difficult to remove after being converted into Nitrates so that nitrate solution is directly discharged to sewerage, cause the ammonia nitrogen in sewage higher, environmental pollution is serious.
Summary of the invention
The cost of investment and the operating cost that exist based on existing denitration technology are higher, denitration efficiency is low, be easily generated a difficult problem for secondary pollution, and this utility model provides NOx conversion in a kind of denitrating flue gas and becomes N2Device, cost of investment and operating cost is low, denitration efficiency is high, non-secondary pollution.
For solving the problems referred to above, the technical solution of the utility model is:
In a kind of denitrating flue gas, NOx conversion becomes N2Device, including ozonator, blower fan, semi-oxidized device, spray column, absorption tower;Described ozonator is connected to described semi-oxidized device by described blower fan;Described semi-oxidized device is connected to described spray column, and described spray column is connected to described absorption tower.
Preferably, the described absorbent in absorption tower is carbamide.
In a kind of denitrating flue gas, NOx conversion becomes N2Device, its implementation comprises the following steps:
(1) flue gas is delivered to semi-oxidized device;
(2) blower fan introduces fresh air outside, is delivered to semi-oxidized device together with the ozone produced with ozonator;
(3) flue gas and the ozone generating portion oxidation reaction in semi-oxidized device containing fresh air;
(4) gas after partial oxidation reaction is delivered to spray column, and in spray column, NOx conversion is become nitrite solution by spray liquid;
(5) nitrite solution is delivered to absorption plant, urea absorption nitrite.
(6) clean gas is by absorbing row outside liquid top exit.
Preferably, above-mentioned steps (2) introduces fresh air outside, by dispersed for ozone to air, improves efficiency oxidized for NO in flue gas.
Preferably, controlling the ozone content that ozonator produces in above-mentioned steps (3), the only half of the NO in flue gas is oxidized to the oxynitride of high-valence state, saves the consumption of ozone.
Preferably, NO, NO in above-mentioned steps (4) spray column2Nitrite is generated with water reaction;
Preferably, above-mentioned steps (5) is under the Absorption of absorbent carbamide, and nitrogen-containing compound is converted to N2
Know-why of the present utility model is: adopt fresh air and part NO in ozone co-oxidation flue gas so that remaining NO and NO2Generate nitrite;Carbamide is adopted to convert nitrite to N again2, reach the purpose of denitration.
The beneficial effects of the utility model are: one, the part of the NO in flue gas is by NO2, O3Consumption be only and be all oxidized to NO at present2Half, save investment and operating cost;Two, adopt carbamide that nitrite is converted directly into N2, solve the excessive intractable difficult problem of nitrate concentration generated in prior art.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present utility model.
In figure, 1-ozonator, 2-blower fan, 3-semi-oxidized device, 4-spray column, 5-water pump, 6-absorption tower.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is further described.
As it is shown in figure 1, this utility model includes ozonator 1, blower fan 2, semi-oxidized device 3, spray column 4, water pump 5, absorption tower 6.Being delivered to semi-oxidized device 3 together with the fresh air that the ozone that ozonator 1 produces introduces with blower fan 2, flue gas is delivered to semi-oxidized device 3, in semi-oxidized device 3, and the part NO in ozone cooperative fresh air oxidation flue gas, it is oxidized as NO2;Residue NO and NO2It is delivered to spray column 4 together, generates nitrite, be delivered to absorption tower 6 again through water pump 5, in absorption tower 6, adopt urea absorption, generate N-2;Clean flue gas after denitration is by row outside the top exit of absorption tower 6.
The dominant response equation of the present embodiment is as follows:
Oxidizing process:
2NO+O2→2NO2
NO+O3→NO2+O2
The generation process of nitrite:
NO+NO2+H2O→2HNO2
Denitrification process:
2NaNO2+CO(NH2)2→Na2CO3+2N2↑+2H2O。
It is only more than that embodiment of the present utility model is briefly described; it is not to restriction of the present utility model; it can have a lot of deformation, the deformation that any same technical professional carries out according to this utility model, all thinks and belongs to protection domain of the present utility model.

Claims (2)

1. in a denitrating flue gas, NOx conversion becomes N2Device, it is characterised in that specifically include that ozonator, blower fan, semi-oxidized device, spray column, absorption tower;Described ozonator is connected to described semi-oxidized device by described blower fan;Described semi-oxidized device is connected to described spray column, and described spray column is connected to described absorption tower.
2. in denitrating flue gas according to claim 1, NOx conversion becomes N2Device, it is characterised in that arranging carbamide in described absorption tower is absorbent.
CN201521122279.7U 2015-12-31 2015-12-31 NOx changes N2's device into among flue gas denitration Expired - Fee Related CN205379785U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106925095A (en) * 2015-12-31 2017-07-07 杭州中兵环保股份有限公司 NO in a kind of denitrating flue gasxChange into N2Apparatus and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106925095A (en) * 2015-12-31 2017-07-07 杭州中兵环保股份有限公司 NO in a kind of denitrating flue gasxChange into N2Apparatus and method

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20160713

Termination date: 20171231

CF01 Termination of patent right due to non-payment of annual fee