CN101352645B - Flue gas catalytic oxidation denitration technique and catalyst thereof - Google Patents

Flue gas catalytic oxidation denitration technique and catalyst thereof Download PDF

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Publication number
CN101352645B
CN101352645B CN2008101206468A CN200810120646A CN101352645B CN 101352645 B CN101352645 B CN 101352645B CN 2008101206468 A CN2008101206468 A CN 2008101206468A CN 200810120646 A CN200810120646 A CN 200810120646A CN 101352645 B CN101352645 B CN 101352645B
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flue gas
catalyst
oxidation
aqueous solution
denitration
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CN2008101206468A
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Chinese (zh)
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CN101352645A (en
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吴忠标
盛重义
王海强
王婕
刘越
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浙江天蓝环保技术有限公司
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Abstract

The invention provides a smoke catalysis and oxidation denitration process which takes a catalyst using TiO2 or ZrO2-TiO2 as a carrier and Co as active ingredient, uses the oxygen contained in the smoke to oxidate the NO as NO2 which is easy to be dissolved in water, utilizes the alkali solution to absorb the NO2 and remove the NOx. The process of the invention has high denitration efficiency and low cost, can selectively recover the nitrite in the denitration outgrowth and realize the resource utilization of the outcome after controlling the content of the NO2 in the oxidated smoke.

Description

Flue gas catalytic oxidation denitration technique and catalyst thereof

Technical field

The present invention relates to the air pollution control technique field, specifically relate to a kind of flue gas catalytic oxidation denitration technique and catalyst thereof, be applicable to fire coal, oil burning boiler and industrial furnace.

Background technology

Gaseous oxidation-absorption denitration technology is to utilize the method for gaseous oxidation with flue gas NO xThe middle less NO of solubility is oxidized to NO 2, N 2O 5Deng, and then with the absorption liquid of alkalescence, oxidisability or reproducibility it is absorbed.This method can not only realize that exhaust gas denitration purifies, and can also realize the recycling of nitrogen oxide.The difference of various gaseous oxidations-absorption denitration technology is the difference of gas-phase oxidization process.The method of gaseous oxidation can be divided into gas chemistry agent direct oxidation, gas-phase photocatalysis oxidation and catalytic gas phase oxidation etc.Compare with the SCR technology, the gaseous oxidation-investment of absorption denitration technology, operating cost are lower, and absorption liquid can recycling, and denitration efficiency is higher, is fit to the boiler of various scales.

Publication number is CN1768902A, the Chinese invention patent of CN1923341A and CN101053747A discloses a kind of ozone oxidation and denitration method of boiler flue gas respectively, the wet ammonia flue gas cleaning technology and the system thereof of coal-burning boiler fume ozone oxidation and simultaneous desulfurization denitrification apparatus and method thereof and while desulphurization denitration, adopt ozone respectively, hydrogen peroxide or methyl alcohol become nitrogen dioxide soluble in water as oxidant with the oxidation of nitric oxide in the flue gas, the nitrogen oxide of high price such as nitrogen trioxide and dinitrogen pentoxide, but because ozone, chemical oxidizing agent such as hydrogen peroxide and methyl alcohol consumption is big, price is more expensive, has influenced the economy of this method.

The O that generally contains 3-8% in the flue gas of coal-burning boiler 2, O under the usual conditions 2Generate NO with the NO reaction 2Speed very slow, so NO in the flue gas 2Content only account for total NO xAbout 10%.Gas-phase catalysis is to utilize catalyst to quicken O 2With the reaction of NO, make NO 2The ratio increase be beneficial to liquid phase and absorb.This method does not need to add external oxidant, has avoided the transportation and the storage of strong oxidizer, has improved the economy and the security of denitrating system.

Publication number is the preparation method that the Chinese invention patent of CN101028596A discloses a kind of oxide nitrogen oxidation catalyst, this catalyst utilizes the method for co-precipitation to prepare manganese base nano-powder oxide catalyst, it is characterized in that having bigger specific area, catalytic oxidation conversion ratio height, when being 200 ℃, the catalytic reaction temperature promptly obtains about 70% catalytic conversion efficiency, when temperature rises to 400 ℃, NO in the waste gas 2/ (NO+NO 2) ratio can be up to 92%.Though this method has obtained very high NO conversion ratio, owing to have the bigger SO of concentration in the flue gas of coal-burning boiler 2, at high concentration SO 2How activity of such catalysts is the key that can this technology of decision be used for coal-fired flue gas denitration under the condition that exists.In addition, NO in the flue gas 2The content efficient that determined nox adsorption with absorb after product, so NO in the flue gas after the oxidation 2Ratio also be the decision this technological feasibility another key factor.

Summary of the invention

The invention provides the catalyst of a kind of flue gas catalytic oxidation denitration technique and use thereof, utilize the oxygen that contains in catalyst and the flue gas with the NO oxidation, the effect that reaches efficient denitration and reclaim accessory substance.

A kind of flue gas catalytic oxidation denitration technique comprises:

(1) is that 150-400 ℃ flue is arranged catalyst in temperature range, utilizes the oxygen O of 3-8% in the flue gas 2Flue gas is carried out oxidation processes, the NO in the flue gas is oxidized to NO soluble in water 2

(2) with the flue gas after the alkali lye absorption oxidation, remove the nitrogen oxide in the flue gas.

Described catalyst for by sol-gel process, hydro-thermal method or immersion process for preparing be active component with Co, TiO 2Or ZrO 2-TiO 2Be the catalyst of carrier, the main existence form of active component Co is Co 2O 3And CoO, wherein, the mol ratio of Co and Ti is 0.01-0.1, the mol ratio of Zr and Ti is 0-0.5, simultaneously, and one or more metallic elements among all right doped with Mn of catalyst, Fe, Cu, V, Cr, the Ce, the mol ratio of doping metals and Ti is 0-0.01.

After using this catalyst oxidation, NO in the flue gas 2Content can be strict controlled in 40-60%, be nitrite with the product after guarantee absorbing.

When flue is arranged catalyst, after the catalytic oxidation section both can be contained in and also can be contained in deduster before the flue dust collector.

Described alkali lye is denitration liquid commonly used in the denitrating technique, as NaOH NaOH, calcium hydroxide Ca (OH) 2, potassium hydroxide KOH, calcium carbonate CaCO 3, calcium oxide CaO, sodium sulfite Na 2SO 3Wherein at least a Deng the aqueous solution.

Catalyst among the present invention mainly contains following characteristics:

1) adopt cobalt as the activity of such catalysts composition, its main existence form is Co 2O 3And CoO, can provide the active sites of catalytic reaction, to reactant NO and O 2Adsorb, and react.

2) Ti is as the main carrier of catalyst activity component, mainly with TiO 2Form exists, and the existence of Ti is similarly NO and O 2Certain adsorptivity is provided, has increased the possibility of reactant in catalyst surface absorption.

3) ZrO 2And TiO 2Combine as carrier, Zr can replace the position of Ti in original lattice, forms ZrTiO 4To form new acidity and basicity, SO on the carrier this moment 2When occupying catalyst, these alkalescence point positions can attract SO 2, form and occupy target position, effectively protect the active sites of active material.And because the adding of Zr has changed the bond energy of crystal, SO 2At ZrTiO 4The surface can only form more weak, reversible sulfate.In addition, ZrO 2Can interact with active material, form metal solid solution, thereby make SO 2Be difficult to generate metal sulfate and sulphite with the active material reaction.

4) other metal oxide that mixes in the catalyst, it mainly act as the electronics that increases in the catalytic reaction and shifts, and with it as storing the oxygen base preferably, the oxidation restorability of enhancing catalyst.

The invention provides a kind of low cost, high efficiency gas denitrifying technology.Under the effect of catalyst, utilize the oxygen O in the flue gas 2NO is oxidized to NO 2, need not to add in addition other oxidants, NO 2Water-soluble generation HNO 3, HNO 2, absorb the denitration efficiency that can reach more than 70% in conjunction with alkali lye.Control after the oxidation NO in the flue gas simultaneously 2Ratio can optionally reclaim nitrite in the denitration accessory substance.Compare with other method of denitration, this method efficient height, cost is low, can carry out the resource of product.

Description of drawings

Fig. 1 is a kind of device for carrying out said schematic diagram of the inventive method;

Fig. 2 is the another kind of device for carrying out said schematic diagram of the inventive method.

The specific embodiment

As shown in Figure 1, enter deduster 2 behind the flue gas of the coal-burning boiler 1 process NO catalyst oxidation reactor 3, part NO is oxidized to NO in the flue gas 2, enter absorption tower 4 washings, with SO 2With NO xTogether remove, absorption liquid 6 is carried by circulating pump 7, enters chimney 8 qualified discharges behind the flue gas process demist plate 5 after the absorption.Absorption liquid is delivered to that resource recovering system separates, crystallization.

Fig. 2 is the another kind of arrangement of the inventive method, with shown in Figure 1 basic identical, enters catalyst oxidation reactor 3 again after the flue gas of different is coal-burning boiler 1 is introduced into deduster 2.

Embodiment 1:

1) sol-gel process prepares CATALYST Co O x/ TiO 2

With tetrabutyl titanate, ethanol, water, acetic acid is raw material, the volume ratio of each component is as follows, tetrabutyl titanate: ethanol: water: acetic acid=1:1.5:0.5:0.5, the addition of cobalt nitrate is Co:Ti (mol ratio)=0.1, mix, treat colloidal sol be converted into dry behind the gel, grind, and under 500 ℃, carry out roasting, obtain catalyst.

2) denitrating technique

Smoke treatment O 2Concentration 3%, GHSV (per hour gas space velocity)=30000h -1, catalytic reactor is installed in the upstream of dust arrester, 300 ℃ of reaction temperatures, reactor outlet NO 2/ (NO+NO 2) the about 40%-60% of ratio, the flue gas after the oxidation enters spray column, in the absorption tower with SO 2With NO xTogether remove, desulfuration efficiency is 90%, and denitration efficiency is 75%.

Embodiment 2:

1) immersion process for preparing CATALYST Co O x/ TiO 2

Cobalt nitrate is added the commercial titanium dioxide slurries, stir 48h, 100 ℃ of oven dry are down calcined 2h down for 500 ℃ then, obtain catalyst after the grinding.Wherein the addition of cobalt is Co:Ti (mol ratio)=0.05.

2) denitrating technique

Smoke treatment O 2Concentration 5%, GHSV (per hour gas space velocity)=50000h -1, catalytic reactor is installed in the upstream of dust arrester, 350 ℃ of reaction temperatures, reactor outlet NO 2/ (NO+NO 2) the about 40%-60% of ratio, the flue gas after the oxidation enters packed tower, in the absorption tower with SO 2With NO xTogether remove, desulfuration efficiency is 95%, and denitration efficiency is 80%.

Embodiment 3:

1) sol-gel process prepares CATALYST Co O x/ ZrO 2-TiO 2

With tetrabutyl titanate, ethanol, water, acetic acid is raw material, the volume ratio of each component is as follows, tetrabutyl titanate: ethanol: water: acetic acid=1:1.65:0.05:0.07, the addition of cobalt nitrate is Co:Ti=0.05, the addition of zirconium nitrate is Zr:Ti (mol ratio)=0.1, mixes, treat colloidal sol be converted into dry behind the gel, grind, and under 600 ℃, carry out roasting, obtain catalyst.

2) denitrating technique

Smoke treatment O 2Concentration 8%, GHSV (per hour gas space velocity)=40000h -1, catalytic reactor is installed in the downstream of dust arrester, 200 ℃ of reaction temperatures, reactor outlet NO 2/ (NO+NO 2) the about 40%-60% of ratio, the flue gas after the oxidation enters the overflowing board tower, in the absorption tower with SO 2With NO xTogether remove, desulfuration efficiency is 90%, and denitration efficiency is 85%.

Embodiment 4:

1) sol-gel process prepares CATALYST Co O x/ ZrO 2-TiO 2

With metatitanic acid n-propyl, propyl alcohol, water, nitric acid is raw material, the volume ratio of each component is as follows, metatitanic acid n-propyl: ethanol: water: acetic acid=1:1.85:0.06:0.02, the addition of cobalt nitrate is Co:Ti (mol ratio)=0.08, the addition of zirconium nitrate is Zr:Ti (mol ratio)=0.5, mixes, treat colloidal sol be converted into dry behind the gel, grind, and under 400-600 ℃, carry out roasting, obtain catalyst.

2) denitrating technique

Smoke treatment O 2Concentration 4%, GHSV (per hour gas space velocity)=30000h -1, catalytic reactor is installed in the downstream of dust arrester, 160 ℃ of reaction temperatures, reactor outlet NO 2/ (NO+NO 2) the about 40%-60% of ratio, the flue gas after the oxidation enters packed tower, in the absorption tower with SO 2With NO xTogether remove, desulfuration efficiency is 85%, and denitration efficiency is 75%.

Embodiment 5:

1) Hydrothermal Preparation catalyst CeO x/ CoO x/ TiO 2

With the tetrabutyl titanate is presoma, and ethanol is solvent, by the CoO of Hydrothermal Preparation doped Ce x/ TiO 2The mol ratio 1:1:10 of tetrabutyl titanate, ethanol, water, the addition of cobalt nitrate is Co:Ti (mol ratio)=0.1, the addition of cerous nitrate is Ce:Ti (mol ratio)=0.005, mixed solution is added to autoclave, issue unboiled water thermal response 6-36h in 100-250 ℃, reaction finishes the back washing, obtains nano level CeO x/ CoO x/ TiO 2Catalyst.

2) denitrating technique

Smoke treatment O 2Concentration 5%, GHSV (per hour gas space velocity)=30000h -1, catalytic reactor is installed in the upstream of dust arrester, 400 ℃ of reaction temperatures, reactor outlet NO 2/ (NO+NO 2) the about 40%-60% of ratio, the flue gas after the oxidation enters sieve-plate tower, in the absorption tower with SO 2With NO xTogether remove, desulfuration efficiency is 85%, and denitration efficiency is 75%.

Embodiment 6:

1) sol-gel process prepares catalyst CeO x/ MnO x/ CoO x/ ZrO 2-TiO 2

With isopropyl titanate, ethanol, water, acetic acid is raw material, the volume ratio of each component is as follows, isopropyl titanate: ethanol: water: acetic acid=1:1.65:0.4:0.5, the addition of zirconium nitrate is Zr:Ti (mol ratio)=0.5, the addition of cobalt nitrate is Co:Ti (mol ratio)=0.05, the addition of manganese acetate is Co:Ti (mol ratio)=0.005, the addition of cerous nitrate is Ce:Ti (mol ratio)=0.001, mix, treat colloidal sol be converted into dry behind the gel, grind, and under 200-600 ℃, carry out roasting, obtain catalyst.

2) denitrating technique

Smoke treatment O 2Concentration 3%, GHSV (per hour gas space velocity)=50000h -1, catalytic reactor is installed in the upstream of dust arrester, 300 ℃ of reaction temperatures, reactor outlet NO 2/ (NO+NO 2) the about 40%-60% of ratio, the flue gas after the oxidation enters the overflowing board tower, in the absorption tower with SO 2With NO xTogether remove, desulfuration efficiency is 95%, and denitration efficiency is 90%.

Claims (3)

1. flue gas catalytic oxidation denitration technique comprises:
(1) in temperature range is 150-400 ℃ flue, arranges catalyst, utilize the oxygen in the flue gas that flue gas is carried out oxidation processes;
(2) with the flue gas after the alkali lye absorption oxidation, remove the nitrogen oxide in the flue gas;
Described catalyst for by sol-gel process, hydro-thermal method or immersion process for preparing be active component with Co, TiO 2Or ZrO 2-TiO 2Catalyst for carrier; One or more metallic elements among described catalyst doped with Mn, Fe, Cu, V, Cr, the Ce, the mol ratio of doping metals and Ti is less than or equal to 0.01 greater than 0.
2. flue gas catalytic oxidation denitration technique as claimed in claim 1 is characterized in that: the mol ratio of described CATALYST Co and Ti is 0.08-0.1, and the mol ratio of Zr and Ti is less than or equal to 0.5 greater than 0.
3. flue gas catalytic oxidation denitration technique as claimed in claim 1 is characterized in that: described alkali lye is at least a in sodium hydrate aqueous solution, calcium hydroxide aqueous solution, potassium hydroxide aqueous solution, calcium carbonate aqueous solution, calcium oxide aqueous solution, the sodium sulfite aqueous solution.
CN2008101206468A 2008-08-29 2008-08-29 Flue gas catalytic oxidation denitration technique and catalyst thereof CN101352645B (en)

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* Cited by examiner, † Cited by third party
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CN106861392A (en) * 2017-02-21 2017-06-20 华北电力大学 A kind of nitrogen oxide removal process based on catalytic oxidation of hydrogen peroxide

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CN103721556A (en) * 2014-01-20 2014-04-16 高同柱 Desulfurization, denitrification and demercuration additive as well as preparation method thereof
CN104474857B (en) * 2014-11-20 2016-07-06 浙江大学 NO in the preposition oxidative absorption coal-fired flue-gas of bioactive moleculexAnd SO2Method and apparatus
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CN107999058A (en) * 2016-11-01 2018-05-08 中国石油化工股份有限公司 A kind of two-phase method flue-gas denitration process and denitration device
CN107088361A (en) * 2017-06-13 2017-08-25 山东大学 A kind of low temperature drips absorption catalytic denitration method
CN107511152A (en) * 2017-09-17 2017-12-26 王兴利 A kind of nanoporous net post material available for vehicle exhaust NOx efficient catalytics and preparation method thereof
CN107866150A (en) * 2017-11-14 2018-04-03 攀钢集团攀枝花钢铁研究院有限公司 The method of vanadic-titanomagnetite sintering flue gas catalytic oxidation denitration

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1883775A (en) * 2006-05-31 2006-12-27 浙江大学 Photo-catalytic oxidation and wet method absorption combined wet method flue-gas denitration process
CN101181682A (en) * 2007-12-14 2008-05-21 浙江大学 Method for preparing ferromagnetic titania cobalt-doped photocatalysis material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1883775A (en) * 2006-05-31 2006-12-27 浙江大学 Photo-catalytic oxidation and wet method absorption combined wet method flue-gas denitration process
CN101181682A (en) * 2007-12-14 2008-05-21 浙江大学 Method for preparing ferromagnetic titania cobalt-doped photocatalysis material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106861392A (en) * 2017-02-21 2017-06-20 华北电力大学 A kind of nitrogen oxide removal process based on catalytic oxidation of hydrogen peroxide

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