CN108176193A - A kind of nano-fluid absorbent for flue gas wet denitration - Google Patents

A kind of nano-fluid absorbent for flue gas wet denitration Download PDF

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CN108176193A
CN108176193A CN201711431458.2A CN201711431458A CN108176193A CN 108176193 A CN108176193 A CN 108176193A CN 201711431458 A CN201711431458 A CN 201711431458A CN 108176193 A CN108176193 A CN 108176193A
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nano
fluid
absorbent
flue gas
concentration
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CN108176193B (en
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徐龙
韩慧宇
闫雨瑗
李波
宣乐
孙鸣
郝青青
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Northwest University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1493—Selection of liquid materials for use as absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/50—Combinations of absorbents
    • B01D2252/504—Mixtures of two or more absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a kind of nano-fluid absorbents for flue gas wet denitration, which is by Na2S2O8、NaCl、FeSO4, water composition absorbent base fluid in addition dispersion stabilizer and inorganic nanoparticles --- nano silicon dioxide, nano-titanium dioxide, nano-aluminium oxide, nano-sized iron oxide, nano-graphite etc., be then ultrasonically treated and be made.The present invention significantly improves the effect of flue gas wet denitration in a manner that nano-fluid strengthens mass transfer.Compared with the absorbent for being not added with nano particle, nano-fluid absorbent of the invention improves a lot to the removal effect of NO, available for thermal power plant NOxRemoving, steam power plant NOxRemove and need to remove the chemical field of NO.

Description

A kind of nano-fluid absorbent for flue gas wet denitration
Technical field
The invention belongs to environmental technology fields, and in particular to a kind of nano-fluid absorbent for flue gas wet denitration.
Background technology
With the fast development of China's economy, the environmental problem brought in fossil energy consumption increasingly highlights, wherein nitrogen oxygen The discharge of compound has become the emphasis of China's environmental improvement.At present, the gas denitrifying technology generally used in the world is that dry method takes off Selective catalytic reduction in nitre technology, but the technology, using catalyst, operating cost is higher, and catalyst easy in inactivation and There are the problems such as genotoxic potential, while occupation area of equipment is big, needs larger fund input.And wet denitration technology is due to tool There is the research focus that the advantages such as process equipment is simple, operation temperature is low, operating cost is low are increasingly becoming various countries' denitration technology.
Recent domestic scholar has carried out a large amount of research with regard to wet denitration technology, and achieves certain achievement.Most First research is come absorbing NOx with water, acid, alkali or ammonia solution.But due to nitrogen oxides in effluent (NOx) using NO as It is main, and NO is extremely difficult is dissolved in water, and it is relatively low to thereby result in denitration efficiency.
It is a kind of current emerging investigative technique to strengthen gas-liquid mass transfer using nano-fluid.Nineteen ninety-five, U.S. Argonne Choi of National Laboratory et al. has been put forward for the first time the concept of nano-fluid, i.e., is suspended by the two-phase that nano particle and base fluid are formed Liquid opens innovative research of the nanometer technology applied to fields such as thermal energy, mass transfer, energy projects.At present, strengthening gas-liquid biography In terms of matter, researcher has studied nano-fluid to NH3And CO2Assimilation effect.
Domestic and international many researchers study reinforced by nanoparticles transport phenomenon in bubbling reactor.Kim etc. is ground Nano-fluid has been studied carefully to NH3Bubble absorption situation, research shows that：It is constructed by Nanometer Copper, nano cupric oxide, nano aluminium oxide Nano-fluid is to NH3Absorption there is different degrees of invigoration effect, best reinforcing effect reached unused nanometer stream 5.32 times in the case of body.Li Shuhong etc. has studied nano-TiO2Particle strengthening N methyldiethanol amine (MDEA) solution bubbling is inhaled Receive CO2Characteristic, the results showed that：When MDEA mass fractions are 50%, nano-TiO2It is right when granular mass score is 0.8% CO2Absorption obtained 11.54% reinforcing.
Patent 201410808295.5 (CN 104607023B) provides a kind of reinforcing CO2Absorbent gas-liquid mass transfer is received The preparation method and application of meter Liu Ti, by inorganic nanoparticles (nano silicon dioxide, nano-titanium dioxide, the oxidation of nanometer three two Aluminium, nano cupric oxide, copper nanoparticle or nano-graphite etc.) it is scattered in CO2Absorbent solution (ethanol amine (MEA), N- methyl diethyls Hydramine (MDEA) or piperazine (PZ)) in be stirred, after ultrasonic vibration using high pressure Microfluidizer processing be made strengthen CO2 The nano-fluid of absorbent gas-liquid mass transfer, CO2Liquid phase mass transfer coefficient than in the case of unused nano-fluid improve 7%~ 14%.
But the research that nano-fluid is applied to denitrating flue gas (absorbing NO) at present has not been reported.
Invention content
The technical problems to be solved by the invention are to overcome the problems, such as that existing wet denitration technology exists, and provide a kind of energy Enough significantly improve the nano-fluid absorbent of flue gas wet denitration effect.
Nano-fluid absorbent is prepared by following methods used by solving above-mentioned technical problem：
1st, by Na2S2O8、NaCl、FeSO4It adds in distilled water, is configured to absorbent base fluid, in the absorbent base fluid Na2S2O8A concentration of 0.1~0.5mol/L, NaCl concentration are 0.01~0.1mol/L, FeSO4A concentration of 0.005~ 0.02mol/L。
2nd, inorganic nanoparticles and dispersion stabilizer are added in absorbent base fluid, 0.1 is added in every liter of absorbent base fluid ~0.5g inorganic nanoparticles and 0.5~1g dispersion stabilizers are stirred at room temperature 0.5~1 hour, obtain fluid.
3rd, the fluid obtained step 2 is ultrasonically treated, and ultrasound works frequency is 20~40kHz, temperature control during supersound process For system at 30~40 DEG C, ultrasonic time is 1~6 hour, obtains nano-fluid absorbent.
Preferred Na in above-mentioned absorbent base fluid2S2O8A concentration of 0.2~0.4mol/L, NaCl concentration for 0.05~ 0.1mol/L、FeSO4A concentration of 0.008~0.015mol/L.
Above-mentioned dispersion stabilizer is neopelex, Sodium Polyacrylate, at least one of sodium gluconate, It is preferred that 0.5~0.8g dispersion stabilizers are added in every liter of absorbent base fluid.
Above-mentioned inorganic nanoparticles are nano silicon dioxide, nano-titanium dioxide, nano-aluminium oxide, nano oxidized 0.2~0.4g inorganic nanoparticles are added at least one of iron, nano-graphite, preferably every liter of absorbent base fluid, it is inorganic to receive The grain size of rice grain is 15~50nm, preferably 30~50nm.
The present invention significantly improves the effect of flue gas wet denitration in a manner that nano-fluid strengthens mass transfer.With not adding The absorbent of Ghana's rice grain is compared, and nano-fluid absorbent of the invention improves a lot to the removal effect of NO, can be used for Thermal power plant NOxRemoving, steam power plant NOxRemove and need to remove the chemical field of NO.
Specific embodiment
With reference to embodiment, the present invention is described in more detail, but protection scope of the present invention is not limited only to these realities Apply example.
Embodiment 1
1st, by 34.82g Na2S2O8、0.58g NaCl、2.78g FeSO4·7H2O is dissolved completely in distilled water, is used in combination Distilled water constant volume is assigned to 1000mL, and be absorbed agent base fluid, Na in the absorbent base fluid2S2O8A concentration of 0.2mol/L, NaCl A concentration of 0.01mol/L, FeSO4A concentration of 0.01mol/L.
2nd, nano aluminium oxide, 0.5g neopelexes and 0.1g sodium gluconates that 0.2g grain sizes are 50nm are added Enter in 1000mL absorbent base fluids, be stirred at room temperature 1 hour, mixing speed 300rpm obtains fluid.
3rd, in the sonicator of fluid merging 20kHz obtained step 2, temperature is controlled at 40 DEG C, is ultrasonically treated Time is 2 hours, obtains nano-fluid absorbent.
The nano-fluid absorbent that inventor obtains the present embodiment is applied in denitrating flue gas, tests what it removed NO Strengthen effect, flue gas flow rate 4L/min, a concentration of 500ppm of NO in flue gas, nano-fluid absorbent temperature is 40 DEG C.While with The absorbent base fluid for not adding nano particle does contrast test.The experimental results showed that：In the case where not adding nano particle, NO Removal efficiency is 47.1%；After using nano-fluid absorbent, NO removal efficiencies are 65.5%, strengthen significant effect.
Embodiment 2
1st, by 52.23g Na2S2O8、0.88g NaCl、5.56g FeSO4·7H2O is dissolved completely in distilled water, is used in combination Distilled water is settled to 1000mL, and be absorbed agent base fluid, Na in the absorbent base fluid2S2O8A concentration of 0.3mol/L, NaCl A concentration of 0.015mol/L, FeSO4A concentration of 0.02mol/L.
2nd, nano-sized iron oxide, 0.5g sodium gluconate of the 0.1g grain sizes for 50nm are added in 1000mL absorbent base fluids, It is stirred at room temperature 0.5 hour, mixing speed 300rpm obtains fluid.
3rd, in the sonicator of fluid merging 20kHz obtained step 2, temperature is controlled at 30 DEG C, is ultrasonically treated Time is 4 hours, obtains nano-fluid absorbent.
The nano-fluid absorbent that inventor obtains the present embodiment is applied in denitrating flue gas, tests what it removed NO Strengthen effect, flue gas flow rate 5L/min, a concentration of 600ppm of NO in flue gas, nano-fluid absorbent temperature is 50 DEG C.While with The absorbent base fluid for not adding nano particle does contrast test.The experimental results showed that：In the case where not adding nano particle, NO Removal efficiency is 62.6%；After using nano-fluid absorbent, NO removal efficiencies are 78.5%, strengthen significant effect.
Embodiment 3
1st, by 17.41g Na2S2O8、1.75g NaCl、11.12g FeSO4·7H2O is dissolved completely in distilled water, is used in combination Distilled water is settled to 1000mL, and be absorbed agent base fluid, Na in the absorbent base fluid2S2O8A concentration of 0.1mol/L, NaCl are dense It spends for 0.03mol/L, FeSO4A concentration of 0.04mol/L.
2nd, nano silicon dioxide and 1g Sodium Polyacrylates that 0.3g grain sizes are 30nm are added in 1000mL absorbent base fluids, It is stirred at room temperature 0.5 hour, mixing speed 300rpm obtains fluid.
3rd, in the sonicator of fluid merging 40kHz obtained step 2, temperature is controlled at 30 DEG C, is ultrasonically treated Time is 5 hours, obtains nano-fluid absorbent.
The nano-fluid absorbent that inventor obtains the present embodiment is applied in denitrating flue gas, tests what it removed NO Strengthen effect, flue gas flow rate 4L/min, a concentration of 500ppm of NO in flue gas, nano-fluid absorbent temperature is 40 DEG C.While with The absorbent base fluid for not adding nano particle does contrast test.The experimental results showed that：In the case where not adding nano particle, NO Removal efficiency is 38.2%；After using nano-fluid absorbent, NO removal efficiencies are 49.1%, strengthen significant effect.
Embodiment 4
1st, by 69.64g Na2S2O8、2.92g NaCl、8.34g FeSO4·7H2O is dissolved completely in distilled water, is used in combination Distilled water is settled to 1000mL, and be absorbed agent base fluid, Na in the absorbent base fluid2S2O8A concentration of 0.4mol/L, NaCl A concentration of 0.05mol/L, FeSO4A concentration of 0.03mol/L.
2nd, nano-titanium dioxide, 0.5g Sodium Polyacrylates and 0.1g sodium gluconates that 0.5g grain sizes are 15nm are added in It in 1000mL absorbent base fluids, is stirred at room temperature 1 hour, mixing speed 300rpm obtains fluid.
3rd, in the sonicator of fluid merging 40kHz obtained step 2, temperature is controlled at 40 DEG C, is ultrasonically treated Time is 6 hours, obtains nano-fluid absorbent.
The nano-fluid absorbent that inventor obtains the present embodiment is applied in denitrating flue gas, tests what it removed NO Strengthen effect, flue gas flow rate 6L/min, a concentration of 600ppm of NO in flue gas, nano-fluid absorbent temperature is 50 DEG C.While with The absorbent base fluid for not adding nano particle does contrast test.The experimental results showed that：In the case where not adding nano particle, NO Removal efficiency is 65.1%；After using nano-fluid absorbent, NO removal efficiencies are 80.2%, strengthen significant effect.
Embodiment 5
1st, by 87.05g Na2S2O8、2.34g NaCl、13.9g FeSO4·7H2O is dissolved completely in distilled water, is used in combination Distilled water is settled to 1000mL, and be absorbed agent base fluid, Na in the absorbent base fluid2S2O8A concentration of 0.5mol/L, NaCl A concentration of 0.04mol/L, FeSO4A concentration of 0.05mol/L.
2nd, nano-graphite and 1g neopelexes that 0.4g grain sizes are 20nm are added in into 1000mL absorbent base fluids In, it is stirred at room temperature 1 hour, mixing speed 300rpm obtains fluid.
3rd, in the sonicator of fluid merging 40kHz obtained step 2, temperature is controlled at 40 DEG C, is ultrasonically treated Time is 6 hours, obtains nano-fluid absorbent.
The nano-fluid absorbent that inventor obtains the present embodiment is applied in denitrating flue gas, tests what it removed NO Strengthen effect, flue gas flow rate 5L/min, a concentration of 500ppm of NO in flue gas, nano-fluid absorbent temperature is 50 DEG C.While with The absorbent base fluid for not adding nano particle does contrast test.The experimental results showed that：In the case where not adding nano particle, NO Removal efficiency is 68.8%；After using nano-fluid absorbent, NO removal efficiencies are 82.4%, strengthen significant effect.

Claims (7)

1. a kind of nano-fluid absorbent for flue gas wet denitration, it is characterised in that the nano-fluid absorbent is by following Method is prepared：
(1) by Na2S2O8、NaCl、FeSO4It adds in distilled water, is configured to absorbent base fluid, Na in the absorbent base fluid2S2O8 A concentration of 0.1~0.5mol/L, NaCl concentration are 0.01~0.1mol/L, FeSO4A concentration of 0.005~0.02mol/L；
(2) inorganic nanoparticles and dispersion stabilizer are added in absorbent base fluid, add in 0.1 in every liter of absorbent base fluid~ 0.5g inorganic nanoparticles and 0.5~1g dispersion stabilizers are stirred at room temperature 0.5~1 hour, obtain fluid；
(3) fluid for obtaining step (2) is ultrasonically treated, and ultrasound works frequency is 20~40kHz, is ultrasonically treated temperature control and is existed 30~40 DEG C, ultrasonic time is 1~6 hour, obtains nano-fluid absorbent.
2. the nano-fluid absorbent according to claim 1 for flue gas wet denitration, it is characterised in that：The suction Receive Na in agent base fluid2S2O8A concentration of 0.2~0.4mol/L, NaCl concentration are 0.05~0.1mol/L, FeSO4A concentration of 0.008 ~0.015mol/L.
3. the nano-fluid absorbent according to claim 1 or 2 for flue gas wet denitration, it is characterised in that：It is described Dispersion stabilizer is at least one of neopelex, Sodium Polyacrylate, sodium gluconate.
4. the nano-fluid absorbent according to claim 3 for flue gas wet denitration, it is characterised in that：Every liter of absorption 0.5~0.8g dispersion stabilizers are added in agent base fluid.
5. the nano-fluid absorbent according to claim 1 for flue gas wet denitration, it is characterised in that：It is described inorganic Nano particle is nano silicon dioxide, nano-titanium dioxide, nano-aluminium oxide, nano-sized iron oxide, in nano-graphite extremely Few one kind, the grain size of inorganic nanoparticles is 15~50nm.
6. the nano-fluid absorbent according to claim 5 for flue gas wet denitration, it is characterised in that：Every liter of absorption 0.2~0.4g inorganic nanoparticles are added in agent base fluid.
7. the nano-fluid absorbent according to claim 5 for flue gas wet denitration, it is characterised in that：It is described inorganic The grain size of nano particle is 30~50nm.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111203220A (en) * 2020-02-24 2020-05-29 上海电力大学 Catalyst for wet flue gas denitration and application thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111203220A (en) * 2020-02-24 2020-05-29 上海电力大学 Catalyst for wet flue gas denitration and application thereof

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