CN102553416A - Method for denitrating flue gas of power plant and absorption liquid used by method - Google Patents
Method for denitrating flue gas of power plant and absorption liquid used by method Download PDFInfo
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- CN102553416A CN102553416A CN2012100373239A CN201210037323A CN102553416A CN 102553416 A CN102553416 A CN 102553416A CN 2012100373239 A CN2012100373239 A CN 2012100373239A CN 201210037323 A CN201210037323 A CN 201210037323A CN 102553416 A CN102553416 A CN 102553416A
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- flue gas
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Abstract
本发明公开了一种电厂烟气脱硝的方法及其所用的吸收液。所述的脱硝的方法即利用吸收塔，采用由H2O2与硫酸铁组成的类Fenton试剂以及以EDTA为添加剂的水溶液作为吸收液，控制温度为30-80℃的条件下，使NO在吸收塔中氧化进而被吸收液吸收从而完成脱硝对电厂烟气进行脱硝；所述的吸收液中H2O2浓度为0.5-1mol/L,Fe2(SO4)3浓度为0.01-0.025mol/L，添加剂EDTA浓度为0.02-0.05mol/L，吸收液的pH为5-6。本发明的一种电厂烟气脱硝的方法简单，脱硝效率高，而且不会引起二次污染。
The invention discloses a method for denitration of flue gas in a power plant and an absorption liquid used therein. The denitrification method mentioned is to use an absorption tower to use a Fenton-like reagent composed of H 2 O 2 and iron sulfate and an aqueous solution with EDTA as an additive as the absorption liquid, and control the temperature at 30-80°C to make NO in the Oxidation in the absorption tower and then absorbed by the absorption liquid to complete denitrification and denitrification of the flue gas of the power plant; the concentration of H 2 O 2 in the absorption liquid is 0.5-1mol/L, and the concentration of Fe 2 (SO 4 ) 3 is 0.01-0.025mol /L, the concentration of additive EDTA is 0.02-0.05mol/L, and the pH of the absorption solution is 5-6. The method for denitrification of flue gas in a power plant is simple, has high denitrification efficiency, and does not cause secondary pollution.
Description
Technical field
The present invention relates to the air contaminant treatment field, particularly a kind of method of power-plant flue gas denitration and used absorption liquid thereof.
Background technology
NOx is a kind of main atmosphere pollution, can not only cause acid rain, also can cause photochemical fog, causes depletion of the ozone layer.According to statistics, coal fire discharged NO
XAccount for NO
XMore than 67 % of total release, human, ecological environment are caused great harm.Along with the raising to environmental requirement, many coal-burning boilers all require to reduce simultaneously the discharging of NOx, and China also can implement strict more NOx discharge standard during " 12 ".
At present for removing of NOx be divided into remove in the burning and burn after remove typical selective catalytic reduction method and SNCR method.Low for the general denitration efficiency of low NOx combusting technology; And may cause the stove internal corrosion; Slagging scorification, even reduce efficiency of combustion for selective catalytic reduction and SNCR method, though there is higher removal efficiency can make that occupation area of equipment is big; Investment and operating cost are high, even also can cause secondary pollution.Therefore, inquire into new denitration technology and be still the task of top priority.Suitable pH scope is 2-4 to the inventor previously presented " power-plant flue gas is carried out the Fenton reagent of denitration and utilizes it to carry out the method for denitration ", and the operation pH value of power plant's limestone-gypsum wet flue gas desulfurizer is generally 5-6.Therefore, on this basis, the aqueous solution that proposes to utilize Fenton-like reagent to combine EDTA removes the method for NO in the flue gas, so that combine with the limestone-gypsum wet method fume desulfurizing system of present power plant extensive use, thereby realize SO
2Remove in the time of with NO.
This patent will propose a kind of aqueous solution that utilizes Fenton-like reagent to combine EDTA removes NOx in the boiler smoke as absorbent method of denitration.Can obtain higher denitration efficiency during for 5-6 in the pH value.
Summary of the invention
The objective of the invention is to propose a kind of method of power-plant flue gas denitration.
Know-why of the present invention
Contain H
2O
2With Fe
2(SO
4)
3Fenton-like reagent, and with EDTA as additive, fully contact with flue gas, the NO of indissoluble is oxidized to
With
Deng, thereby absorbed by slurries.The related chemical reaction of its denitrating technique technology is:
（4）
The present invention adopts Fenton-like reagent to combine EDTA as the NOx absorbent, and is simple in structure, takes up an area of and lacks, and denitration efficiency can reach more than 80%.
Technical scheme of the present invention
A kind of method of power-plant flue gas denitration; Utilize the absorption tower; Promptly adopt the aqueous solution that the Fenton-like reagent be made up of hydrogen peroxide solution and ferric sulfate and EDTA be additive as absorption liquid; The control temperature is under 30-80 ℃ the condition, thereby makes NO oxidation and then accomplished denitration by liquid-absorbent power-plant flue gas is carried out denitration in the absorption tower;
H in the absorption liquid
2O
2Concentration is 0.5-1mol/L, Fe
2(SO
4)
3Concentration is 0.01-0.025mol/L, and additive EDTA concentration is 0.02-0.05mol/L, and the pH of absorption liquid is 5-6.
The form of spray column is adopted on above-mentioned absorption tower, and its structural representation is as shown in Figure 1, comprises the tower body 6 on absorption tower, on the tower body 6 on absorption tower, is provided with overfall 1, and gas approach 2, exhanst gas outlet 5, slurries spray district 3 and remove fog-zone 4;
The tower body 6 on absorption tower is respectively from bottom to top: overfall 1, and gas approach 2, spray district 3 removes fog-zone 4, exhanst gas outlet 5;
Described gas approach 2 has a 10-20 ° angle with horizontal plane;
Said overfall 1 is a U-shaped pipeline, and spray district 3 is provided with the spraying layer of 3 ~ 4 layers of interlaced arrangement.Specifically look denitration effect and can consider to turn off the part spraying layer, remove the fog-zone in order to go out drop in the flue gas.
Utilize above-mentioned absorption tower and absorption liquid to realize the method for power-plant flue gas denitration, specifically comprise the steps:
(1), the preliminary treatment of flue gas
Flue gas to needing denitration at first passes through the electric precipitation preliminary treatment, removes the solid particulate matter more than 99.5% in the flue gas;
(2), the denitration of flue gas
Step (1) is sent into the tower body 6 on absorption tower through the gas approach 2 of tower body 6 bottoms on absorption tower through the flue gas after the preparatory dust removal process; Then flue gas flow through the absorption tower tower body 6 middle top interlaced arrangement spray district 3 and with the drop counter current contacting of the absorption liquid of the spraying layer ejection in spray district 3, accomplish denitration;
(3), the demist of flue gas
When the flue gas in the step (2) after denitration is flowed through the demister in demister district, top 4 of tower body 6 on absorption tower; Remove drop entrained in the flue gas; Remove the bottom that drop falls into the tower body 6 on absorption tower; Discharge from the overfall 1 of the sides of the tower body 6 on absorption tower, the clean flue gas of gained is drawn and is discharged from chimney from the top exhanst gas outlet 5 of the tower body 6 on absorption tower.
Beneficial effect of the present invention
The method of a kind of denitrating flue gas of the present invention is owing to use H
2O
2With Fe
2(SO
4)
3The Fenton-like reagent of forming carries out denitration, strengthens Fe through adding EDTA
3+Solubility under solutions of weak acidity and strengthen the oxidability of Fenton-like reagent.Therefore, the method for a kind of denitrating flue gas of the present invention not only can be issued to higher denitration efficiency in solutions of weak acidity, can reach more than 80%, and can not cause secondary pollution.
Description of drawings
The structural representation on used absorption tower in the method for Fig. 1, a kind of power-plant flue gas denitration of the present invention.
The specific embodiment
Through embodiment the present invention is further set forth below, but do not limit the present invention.
Denitration efficiency=(inlet NOx concentration-outlet NOx concentration)/inlet NOx concentration * 100%
Embodiment 1
Preparation H
2O
2With Fe
2(SO
4)
3Concentration be respectively 0.75mol/L, 0.025mol/L, EDTA concentration is that 0.05mol/L is added in the reactor, regulates pH to 5.5 and obtains this absorption liquid.
Embodiment 2
Adopt the absorption liquid of embodiment 1 gained, the control temperature is under 55 ℃ the condition, to carry out the power-plant flue gas denitration with the absorption tower.
Described power-plant flue gas is the flue gas of discharging from boiler, is 6785m through flue gas flow after the electrostatic precipitator
3/ h, wherein NO concentration is 1339ppm.
Above-mentioned flue gas after electrostatic precipitator flows through interlaced arrangement spray district 4 through the tower body 6 on the smoke inlet 2 entering absorption towers of the tower body 6 on absorption tower from bottom to top, with the reverse haptoreaction of absorption liquid, removes NO wherein;
Above-mentioned absorption liquid is with flow 67.85m
3/ h constantly is transported to the spray district, sprays from nozzle;
Flue gas after denitration is handled flows out from the exhanst gas outlet 5 of the tower body 6 on absorption tower at last, gets into chimney and discharges;
Waste liquid after the denitration then flows out through the overfall 1 of the tower body 6 on absorption tower and gets into wastewater treatment equipment, thereby accomplishes whole denitrification process.
Utilize moral Figure 35 0XL flue gas analyzer to measure outlet NOx concentration at smoke outlet 5, calculating can utilize the method for a kind of denitrating flue gas of the present invention, and its denitration efficiency can reach 83.5%.
Foregoing is merely the basic explanation of the present invention under conceiving, and according to any equivalent transformation that technical scheme of the present invention is done, all should belong to protection scope of the present invention.
Claims (5)
1. the method for a power-plant flue gas denitration is utilized the absorption tower, it is characterized in that adopting the aqueous solution that the Fenton-like reagent be made up of hydrogen peroxide solution and ferric sulfate and EDTA be additive as absorption liquid, the control temperature be 30-80 ℃ to denitrating flue gas;
H in the absorption liquid
2O
2Concentration is 0.5-1mol/L, Fe
2(SO
4)
3Concentration is 0.01-0.025mol/L, and additive EDTA concentration is 0.02-0.05mol/L.
2. the method for a kind of power-plant flue gas denitration as claimed in claim 1, the pH that it is characterized in that described absorption liquid is 5～6.
3. according to claim 1 or claim 2 a kind of method of power-plant flue gas denitration is characterized in that specifically comprising the steps:
(1), the preliminary treatment of flue gas
Flue gas to needing denitration at first passes through the electric precipitation preliminary treatment, removes the solid particulate matter more than 99.5% in the flue gas;
(2), the denitration of flue gas
Step (1) is sent into the tower body (6) on absorption tower through the gas approach (2) of tower body (6) bottom on absorption tower through the flue gas after the preparatory dust removal process; Then flue gas flow through the absorption tower tower body (6) middle top interlaced arrangement spray district (3) and with the drop counter current contacting of the absorption liquid of the spraying layer ejection of spray district (3), accomplish denitration;
(3), the demist of flue gas
When the flue gas in the step (2) after denitration is flowed through the demister in demister district, top (4) of tower body (6) on absorption tower; Remove drop entrained in the flue gas; Remove the bottom of the tower body (6) that drop falls into the absorption tower; Discharge from the overfall (1) of the sides of the tower body (6) on absorption tower, the clean flue gas of gained is drawn and is discharged from chimney from the top exhanst gas outlet (5) of the tower body (6) on absorption tower.
4. like the used absorption liquid of method of claim 1,2 or 3 described a kind of power-plant flue gas denitrations, it is characterized in that Fenton-like reagent and EDTA that described absorption liquid is made up of hydrogen peroxide solution and ferric sulfate are the aqueous solution of additive.
5. absorption liquid as claimed in claim 4 is characterized in that H in the absorption liquid
2O
2Concentration is 0.5-1mol/L, Fe
2(SO
4)
3Concentration is 0.01-0.025mol/L, and additive EDTA concentration is 0.02-0.05mol/L, and pH is 5～6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100373239A CN102553416A (en) | 2012-02-20 | 2012-02-20 | Method for denitrating flue gas of power plant and absorption liquid used by method |
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|---|---|---|---|
| CN2012100373239A CN102553416A (en) | 2012-02-20 | 2012-02-20 | Method for denitrating flue gas of power plant and absorption liquid used by method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106310880A (en) * | 2016-10-25 | 2017-01-11 | 华东理工大学 | Device and method for removing NO |
| CN109200792A (en) * | 2018-05-28 | 2019-01-15 | 柏美迪康环境科技（上海）股份有限公司 | A kind of steel works sintering smoke comprehensive processing method and system |
| CN113413743A (en) * | 2021-05-27 | 2021-09-21 | 浙江天蓝环保技术股份有限公司 | Wet denitration and dust removal process and equipment for recycling denitration agent |
| CN114471117A (en) * | 2022-01-07 | 2022-05-13 | 浙江浩普环保工程有限公司 | A kiln low-temperature flue gas ammonia-free denitration collaborative desulfurization system |
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2012
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| CN101555045A (en) * | 2009-04-30 | 2009-10-14 | 华中科技大学 | Method for adsorbing, recycling and disposing wastewater |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106310880A (en) * | 2016-10-25 | 2017-01-11 | 华东理工大学 | Device and method for removing NO |
| CN106310880B (en) * | 2016-10-25 | 2018-12-21 | 华东理工大学 | Remove NO device and its removal methods |
| CN109200792A (en) * | 2018-05-28 | 2019-01-15 | 柏美迪康环境科技（上海）股份有限公司 | A kind of steel works sintering smoke comprehensive processing method and system |
| CN113413743A (en) * | 2021-05-27 | 2021-09-21 | 浙江天蓝环保技术股份有限公司 | Wet denitration and dust removal process and equipment for recycling denitration agent |
| CN113413743B (en) * | 2021-05-27 | 2022-06-14 | 浙江天蓝环保技术股份有限公司 | Wet denitration and dust removal process and equipment for recycling denitration agent |
| CN114471117A (en) * | 2022-01-07 | 2022-05-13 | 浙江浩普环保工程有限公司 | A kiln low-temperature flue gas ammonia-free denitration collaborative desulfurization system |
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Application publication date: 20120711 |