CN103170228B - A kind of denitrating flue gas mixed solution and application process thereof - Google Patents
A kind of denitrating flue gas mixed solution and application process thereof Download PDFInfo
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- CN103170228B CN103170228B CN201310128645.9A CN201310128645A CN103170228B CN 103170228 B CN103170228 B CN 103170228B CN 201310128645 A CN201310128645 A CN 201310128645A CN 103170228 B CN103170228 B CN 103170228B
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Abstract
The invention discloses a kind of denitrating flue gas mixed solution, wherein comprise 0-40wt% sodium chlorite, 0-60wt% urea, 0-25wt%NaOH, 0-25wt% vulcanized sodium.Mixed solution of the present invention is used to carry out the method for denitration to flue gas: mixed solution to be placed in oxidizing tower, to carry out wet absorption to flue gas, mate with NO
xmolal quantity 0.5-2.5 mixed solution doubly, in tower, liquid gas volume ratio is 1-20L/m3, gas-operated speed 0.6-4m/s in oxidizing tower.Mixed solution pH is controlled at 6-8 optimum.The present invention's investment is supported, and moderate, nitrogen oxide removal efficiency is more than 70%.
Description
Technical field
The invention belongs to field of environment engineering, be specifically related to a kind of denitrating flue gas mixed solution and application process thereof
Background technology
Containing SO in the flue gas of discharged from coal-fired boiler
2, the multiple oxious component such as NOx and dust.Wherein nitrogen oxide (NOx) is one of pollutant of priority control.Not only to the organ such as lungs, heart of human body and animal, there is strong intoxicating effect; but also acid mist, acid rain and photochemical fog can be formed, damage the ozone layer; high risks is brought to ecological environment and human being's production, life; so become the important component part of environmental protection containing NOx waste gas pollution control and treatment, it is also the most important condition that industry operation runs.
Flue gas desulfurization and denitrification technology popular is at present first through denitrating flue gas, normally selective catalytic reduction SCR, then through flue gas desulfurization, most widely used is Wet Flue Gas Desulfurization Technique, then passes through smoke stack emission.This technology has efficiency high advantage, and desulfuration efficiency can reach more than 90%, and denitration efficiency also can reach more than 80%, but to be SR large for its shortcoming, floor space and investment large, operating cost is high.
The middle-size and small-size coal-burned industrial boiler of China has a large capacity and a wide range, and the whole nation about has 500,000.These boiler energy utilization ratios are low, average operating efficiency only 60% ~ 65%, lower than Foreign Advanced Lerel by 15% ~ 20%, and pollutant emission is serious.China's middle and small burn coal boiler because its capacity is little, the feature of large, the dispersion of layouting of quantity and be difficult to Concetrated control.Mediumand smallscale industrial boilers consumes about 400,000,000 tons, raw coal every year, discharge SO
2about 6,000,000 tons, NOx about 3,600,000 tons, its emission source is small and scattered, but has a large capacity and a wide range, and gross contamination emission is very large, is the second largest coal-smoke pollution source being only second to thermal power plant.Because medium and small boiler capacity is little, the method denitrification investment such as SCR are large, do not calculate economically, seriously constrain the denitration process of medium and small boiler.12 clearly propose will strengthen advancing the other industry discharged nitrous oxides based on cement industry to control, middle and small burn coal boiler denitration problem in the urgent need to address.
Because the NO in flue gas accounts for about 90% of NOx, and NO is a kind of hardly by the inert gas of water or alkali liquor absorption, makes existing wet desulphurization be difficult to denitration simultaneously.If the NO in flue gas is oxidized to NO
2/ NO=l ~ 1.3, both effectively can absorb NOx.But the NO of low concentration oxidation rate in flue slowly, becomes the rate-limiting reaction of absorption rate.Therefore need to add oxidant in actual applications and accelerate its oxidation, to reach the object of simultaneous SO_2 and NO removal.In recent years, the method for adding chemical reagent in the liquid phase is extensively attempted by Chinese scholars.
Summary of the invention
Technical problem to be solved by this invention is for middle and small burn coal boiler denitration problem, provides a kind of denitrating flue gas mixed solution and application process thereof, and mixed solution plays the effect of oxidation and reduction to NO simultaneously, and the NO in flue gas is oxidized to NO
2, be finally reduced to N
2, reach denitrating flue gas object.
Denitrating flue gas mixed solution of the present invention, mainly comprises two parts, and a part is flue gas oxidant, comprises 0-40wt% sodium chlorite, 0-10wt% clorox, 0-10wt% potassium permanganate, 0-60wt% urea, 0-25wt%NaOH, 0-25wt% vulcanized sodium.Another part is the protective agent of oxidant, comprises 0-5wt%Na
2cO
3cook protective agent with 0-20wt%NaCl, prevent the existence of sulfur dioxide from consuming oxidant excessively
In mixed solution of the present invention, adding of oxidant accelerates NO oxidation, is converted into NO
2, make the NO in flue gas be oxidized to NO
2/ NO=l ~ 1.3, NO
2soluble in water, then other compositions and its reaction in liquid phase, contacts and reacts thus reach denitration in liquid phase oxidation tower.
Flue gas enters oxidation of nitric oxide tower after dust-removal and desulfurizing, carries out Simultaneous Oxidation Reducing and absorption with mixed solution of the present invention, as flue gas NO
xconcentration, when 200-700ppm, is mated with oxidant total mole number for NO
xmolal quantity 0.5-2.5 mixed solution doubly.Because actual sulfur dioxide in flue gas may consume the oxidant of a part with nitrogen oxide competitive reaction, the concrete amount of actual consumption mixed liquor can by the impact of smoke components.After Simultaneous Oxidation Reducing and absorption, in flue gas, nitrogen dioxide almost can remove completely, nitric oxide production clearance 50-80%, the general 60-90% of clearance that nitrogen oxide is total, and main chemical reactions is as follows:
NaClO
2+HCl→ClO
2
ClO
2+NO→NO
2
2NaOH+2NO
2→NaNO
3+NaNO
2+H
2O
2NaOH+2NO
2+NO→2NaNO
2+H
2O
2NO
2+Na
2S→N
2+Na
2SO
4
In concrete use, depending on sulfur dioxide concentration situation, certain Na can be added in this mixed solution
2cO
3or NaCl cooks protective agent, prevent sulfur dioxide from consuming oxidant excessively.
Mixed solution of the present invention is used to the method that flue gas carries out denitration to be:
Mixed solution of the present invention is placed in oxidizing tower, wet absorption is carried out to flue gas, mate with oxidant total mole number for NO
xmolal quantity 0.5-2.5 mixed solution doubly, in tower, liquid gas volume ratio is 1-20L/m
3, gas-operated speed 0.6-4m/ in oxidizing tower
s.Mixed solution pH controls at 6-8 optimum.
The present invention's investment is supported, and moderate, nitrogen oxide removal efficiency is more than 70%.Relative to gaseous oxidation, liquid phase scrubbing technique, this method reaction all in the liquid phase, can be carried out in same tower again, simplify system architecture, not only simple to operate, and reduces cost of investment and operating cost.And seek NO to be converted into NO with traditional liquid phase oxidation
2and then being converted into nitrate anion difference, the present invention is mainly converted into NO NO
2and then conversion nitrogen, decrease the secondary pollution that accessory substance brings from technique source, decrease the cost that waste water is processed, more economically environmental protection, be conducive to it and apply.
Accompanying drawing explanation
Fig. 1, uses mixed solution of the present invention to carry out the process schematic representation of denitrating flue gas.
Detailed description of the invention
The present invention is in a wet process based on desulfur technology, add in the solution in oxidizing tower can change nitrogen oxides degree with NaClO
2, NaOH, urea, vulcanized sodium carries out the mixed solution mixed by a certain percentage, makes nitrogen oxide be absorbed removing.And add certain Na
2cO
3, NaCl cooks protective agent, prevents sulfur dioxide from consuming oxidant excessively.
Adopt technological process as shown in Figure 1, flue gas after desulfurization and dedusting sends into oxidizing tower by blower fan, and the NOx part in flue gas is absorbed in solution by Simultaneous Oxidation, enters chimney discharge after flue gas with booster fan, waste liquid after denitration enters exhausted bath box, carries out lower step process.
Embodiment 1:
Flue gas after desulfurization and dedusting is sent into oxidizing tower, when to enter in absorption tower mixed solution in the unit interval and enter in the unit interval that in absorption tower, nitrogen oxide mol ratio is 2-6, NaClO in mixed liquor
2mass concentration is 2%, and the mass concentration of urea is 10%, NaOH mass concentration 2.5%, vulcanized sodium mass concentration 2.5%.After entering absorption tower, denitration efficiency is 55%.
Embodiment 2:
Flue gas after desulfurization and dedusting is sent into oxidizing tower, when to enter in absorption tower mixed solution in the unit interval and enter in the unit interval that in absorption tower, nitrogen oxide mol ratio is 5-10, mixed liquor NaClO
2mass concentration is 5%, and the mass concentration of urea is 20%, NaOH mass concentration 10%, vulcanized sodium mass concentration 10%.Na
2cO
3mass concentration to be the mass concentration of 10%, NaCl be 20% cooks protective agent.After entering absorption tower, denitration efficiency is 75%.
Embodiment 3:
Flue gas after desulfurization and dedusting is sent into oxidizing tower, when to enter in absorption tower mixed solution in the unit interval and enter in the unit interval that in absorption tower, nitrogen oxide mol ratio is 2-6, mixed liquor sodium chlorite mass concentration is 2%, clorox concentration is 3%, potassium permanganate mass concentration is 2.5%, the mass concentration of urea is 10%, NaOH mass concentration 2.5%, vulcanized sodium mass concentration 2.5%.After entering absorption tower, denitration efficiency is 55%.
Embodiment 4:
Flue gas after desulfurization and dedusting is sent into oxidizing tower, when to enter in absorption tower mixed solution in the unit interval and enter in the unit interval that in absorption tower, nitrogen oxide mol ratio is 5-9, mixed liquor sodium chlorite mass concentration is 2%, clorox concentration is 3%, potassium permanganate mass concentration is 2.5%, the mass concentration of urea is 10%, NaOH mass concentration 25%, vulcanized sodium mass concentration 2.5%.After entering absorption tower, denitration efficiency is 75%.
Embodiment 5:
Flue gas after desulfurization and dedusting is sent into oxidizing tower, when to enter in absorption tower mixed solution in the unit interval and enter in the unit interval that in absorption tower, nitrogen oxide mol ratio is 2-4, mixed liquor sodium chlorite mass concentration is 40%, the mass concentration of urea is 60%, NaOH mass concentration 2.5%, vulcanized sodium mass concentration 2.5%.After entering absorption tower, denitration efficiency is more than 95%.
Embodiment 6:
Flue gas after desulfurization and dedusting is sent into oxidizing tower, when to enter in absorption tower mixed solution in the unit interval and enter in the unit interval that in absorption tower, nitrogen oxide mol ratio is 2-6, mixed liquor clorox concentration is 10%, potassium permanganate mass concentration is 2.5%, the mass concentration of urea is 10%, NaOH mass concentration 2.5%, vulcanized sodium mass concentration 2.5%.After entering absorption tower, denitration efficiency is 60%.
Embodiment 7:
Flue gas after desulfurization and dedusting is sent into oxidizing tower, when to enter in absorption tower mixed solution in the unit interval and enter in the unit interval that in absorption tower, nitrogen oxide mol ratio is 3-8, mixed liquor sodium chlorite mass concentration is 2%, clorox concentration is 3%, potassium permanganate mass concentration is 10%, the mass concentration of urea is 10%, NaOH mass concentration 2.5%, vulcanized sodium mass concentration 2.5%.After entering absorption tower, denitration efficiency is 45%.
Embodiment 8:
Flue gas after desulfurization and dedusting is sent into oxidizing tower, when to enter in absorption tower mixed solution in the unit interval and enter in the unit interval that in absorption tower, nitrogen oxide mol ratio is 3-8, mixed liquor sodium chlorite mass concentration is 2%, clorox concentration is 3%, potassium permanganate mass concentration is 10%, the mass concentration of urea is 10%, NaOH mass concentration 2.5%, vulcanized sodium mass concentration 25%.After entering absorption tower, denitration efficiency is 65%.
Claims (3)
1. a denitrating flue gas mixed solution, is characterized in that, comprises 2-40wt% sodium chlorite, 3-10wt% clorox, 2.5-10wt% potassium permanganate, 10-60wt% urea, 2.5-25wt%NaOH, 2.5-25wt% vulcanized sodium; Also comprise Na
2cO
3prevent sulfur dioxide from consuming oxidant excessively with NaCl, wherein 0<Na
2cO
3≤ 5wt%, 0<NaCl≤20wt%.
2. use the mixed solution described in claim 1 flue gas to be carried out to the method for denitration, its feature exists:
Mixed solution according to claim 1 is placed in oxidizing tower, carries out wet absorption to flue gas, in described mixed solution, oxidant total mole number is NO in flue gas
xdoubly, in tower, liquid gas volume ratio is 1-20L/m to molal quantity 0.5-2.5
3, gas-operated speed 0.6-4m/s in oxidizing tower.
3. method according to claim 2, is characterized in that, mixed solution pH controls at 6-8.
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| CN103170228B true CN103170228B (en) | 2016-01-13 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104338425B (en) * | 2013-08-07 | 2018-01-02 | 北京阳光欣禾科技有限公司 | A kind of process of wet flue gas denitration |
| CN103949145B (en) * | 2014-04-23 | 2017-01-25 | 林小晓 | Method for removing nitrogen oxide in flue gas, and nano flue gas denitration system |
| CN104511240A (en) * | 2014-12-10 | 2015-04-15 | 金川集团股份有限公司 | Treatment method for nitrogen oxide waste gas |
| CN106823746A (en) * | 2017-03-07 | 2017-06-13 | 苏州清控环保科技有限公司 | A kind of tobacco remover and preparation method thereof |
| CN108722134A (en) * | 2017-04-15 | 2018-11-02 | 史汉祥 | A kind of denitration method for flue gas and flue gas desulfurization and denitration method |
| CN113144849B (en) * | 2021-05-07 | 2023-01-24 | 西安睿宇翰江商贸有限公司 | Denitration agent and denitration solution for smelting flue gas and application of denitration agent and denitration solution |
| CN113457421A (en) * | 2021-07-24 | 2021-10-01 | 德清绿能热电有限公司 | Oxidation absorption liquid for boiler flue gas treatment and boiler flue gas treatment system |
| CN114288832A (en) * | 2021-12-29 | 2022-04-08 | 南京派都环保科技有限公司 | Efficient agent for treating nitrogen oxides in waste gas |
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| KR100520415B1 (en) * | 2004-11-25 | 2005-10-11 | 신도건공 주식회사 | Nox removal method from exhaust fumes |
| CN101385942A (en) * | 2008-10-13 | 2009-03-18 | 浙江大学 | Liquid-phase oxidation-absorption two-stage wet method flue-gas denitration technique |
| CN101406803A (en) * | 2008-10-28 | 2009-04-15 | 浙江大学 | Ultrasonic wave denitration method for flue gas |
| CN101653691A (en) * | 2008-08-21 | 2010-02-24 | 南开大学 | Mixed solution for simultaneously desulfurizing and denitrating and application method thereof |
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2013
- 2013-04-15 CN CN201310128645.9A patent/CN103170228B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100520415B1 (en) * | 2004-11-25 | 2005-10-11 | 신도건공 주식회사 | Nox removal method from exhaust fumes |
| CN101653691A (en) * | 2008-08-21 | 2010-02-24 | 南开大学 | Mixed solution for simultaneously desulfurizing and denitrating and application method thereof |
| CN101385942A (en) * | 2008-10-13 | 2009-03-18 | 浙江大学 | Liquid-phase oxidation-absorption two-stage wet method flue-gas denitration technique |
| CN101406803A (en) * | 2008-10-28 | 2009-04-15 | 浙江大学 | Ultrasonic wave denitration method for flue gas |
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