CN105709863B - A kind of SCR regenerating flue gas denitrifying catalyst liquid and preparation method thereof - Google Patents
A kind of SCR regenerating flue gas denitrifying catalyst liquid and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of SCR regenerating flue gas denitrifying catalyst liquid and preparation method thereof, including following content: (1) carrying out soot blowing, cleaning and drying process to discarded SCR denitration；(2) dried SCR denitration is crushed, the strong base solution that 10wt%-40wt% is added reacts 3-8 hours at 150-200 DEG C of temperature；(3) pH value of regulating step (2) reaction solution is separated by filtration to obtain the regenerated liquid containing sodium tungstate and sodium vanadate to 9-10.The present invention prepares the high activity regenerated liquid containing sodium tungstate and sodium vanadate by the way that discarded SCR denitration is cleaned, dries, crushes, dissolves and filtered, and is regenerated using above-mentioned regenerated liquid to decaying catalyst, has favorable regeneration effect, SO2/SO3The features such as conversion ratio is low, regeneration cost is low.
Description
Technical field
The invention belongs to environmental protection catalyst fields, and in particular to a kind of SCR regenerating flue gas denitrifying catalyst liquid and its preparation
Method.
Background technique
Denitration refers to the removal of nitrogen oxides (NOx).In recent years, the NOx discharge in China constantly increases, and 2010
NOx discharge is up to 22,730,000 tons, is the big discharge state of the first in the world.It will be up to 27,500,000 tons to the year two thousand twenty NOx discharge.NOx
It is the main reason for forming acid rain, China caused by Acid Rain Pollution every year because losing more than 300,000,000,000 yuan, this is just to the ring in China
Border and society cause great threat.China formulated stringenter NOx emission standard (100- since 2012
200mg/m3).In numerous method of denitration, selective catalytic reduction (SCR) denitrification rate height (> 90%), technology maturation,
As the domestic and international main method (accounting for 96%) for administering NOx.The principle of SCR method denitration is NOx under the action of catalyst by NH3Also
Original is at nontoxic N2And H2O.To guarantee the smooth of flue gas circulation, denitrating catalyst generally uses monolith shape to arrange, form has
It is cellular, flat and corrugated.The main component of commercial denitrating catalyst is V at present2O5、WO3For catalyst aid, TiO2
As carrier.
Catalyst is core in SCR system, typically constitutes the 30%-50% of initial investment.Due in flue gas contain K, Na,
The oxides such as As and flying dust are easy to make catalyst poisoning and blocking, and making catalyst, activity constantly decreases up in use
It loses activity.The catalyst that fouled catalyst and activity reduce can be re-used by regeneration, regeneration expense only has
The 30%-50% of update cost, and activity can be restored to original 90% or more.The regeneration for studying SCR catalyst, can extend and urge
The service life of agent, this can not only reduce the operating cost of SCR system, can also greatly reduce disposition decaying catalyst and
The solid waste of generation makes full use of resource, mitigates environmental pressure.
The regeneration technology of the current existing catalyst in the country includes the techniques such as immersion, cleaning, activation, reparation and drying substantially
Process, the active component of regenerated liquid is mainly based on vanadium and tungsten.
CN102764675A discloses one kind for the regenerated formula of coal-fired flue gas denitration catalyst activity, mainly utilizes
(NH4)2SO4, ethylenediamine tetra-acetic acid (EDTA), alkyl phenol polyoxy ether (OP ~ (n), n=10), high-carbon fatty alcohol polyoxy ether (seep
Saturating agent JFC peace plus O), ammonium metavanadate and ammonium paratungstate composite regenerated solution as the main component carries out decaying catalyst
Activation recovering.
CN102059156A discloses one kind and is used for coal-burning power plant's honeycomb type denitrification catalyst regenerated liquid and regeneration method,
Regenerated liquid includes cleaning solution and active supplement solution, wherein cleaning solution contains H2SO4With emulsifier S-185；Active supplement solution contains
VOSO4And ammonium metatungstate；Cleaning method uses ultrasonic cleaning.The regenerated catalyst of the invention, relative activity (K/K0)
For 0.95-0.99, SO2/SO3Conversion ratio is respectively less than 1%.
CN101574671B discloses a kind of SCR denitration regenerated liquid, the penetration enhancer including 0.001-1wt%
JFC accounts for the Surfactant OP -10 of total content 0.001%-1wt%, accounts for the peregal of total content 0-1wt%, accounts for total content 0.6-
The ammonium metavanadate of 4wt% accounts for the ammonium paratungstate of total content 5.5-12.5wt%, accounts for the secondary molybdenum of total content regenerated liquid total amount 0-6.5wt%
Sour ammonium, surplus are deionized water and acid, can supplement active constituent, activity after catalyst regeneration simultaneously again while being cleaned
Restore up to arrive 90%-105%；Due to being added to nonionic surface active agent in regenerated liquid, both improved to the clear of catalyst
Clean ability again will not damage catalyst carrier and other effective components；By regeneration after catalyst be fully able to by after
Continuous normal use, service life can achieve 95% of raw catelyst or more.
Above-mentioned patent be with vanadium titanium catalyst for regeneration object, with containing ammonium metavanadate, ammonium paratungstate, ammonium metatungstate or
Ammonium paramolybdate etc. is the regenerated liquid of active component preparation, and regeneration cost is higher.Moreover, ammonium metavanadate becomes after calcining
V2O5, V2O5It is a kind of extremely toxic substance, it can not only generate serious pollution, but also the vanadium titanium after regeneration in production, use process
Catalyst still will continue to pollute the environment.Meanwhile the denitrification rate pair of regeneration front and back catalyst is only pointed out in partial monopoly
Than situation, do not illustrate SO2/SO3Conversion ratio situation.It should be pointed out that during SCR denitration, the SO of catalyst2/SO3
Conversion ratio is generally required less than 1%.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of SCR regenerating flue gas denitrifying catalyst liquid and its preparation sides
Method.The present invention is by cleaning discarded SCR denitration, drying, crush, dissolve and filtering is prepared containing wolframic acid
The high activity regenerated liquid of sodium and sodium vanadate, regenerates decaying catalyst using above-mentioned regenerated liquid, have favorable regeneration effect,
SO2/SO3The features such as conversion ratio is low, regeneration cost is low.
The preparation method of SCR regenerating flue gas denitrifying catalyst liquid of the present invention, including following content:
(1) discarded SCR denitrating catalyst is taken to carry out soot blowing, cleaning and drying process；
(2) dried SCR denitration is crushed, the strong base solution of 10wt%-40wt% is added in temperature 150-200
It is reacted 3-8 hours at DEG C；
(3) pH value of regulating step (2) reaction solution is separated by filtration to obtain the regeneration containing sodium tungstate and sodium vanadate to 9-10
Liquid.
In the present invention, the SCR denitrating catalyst discarded described in step (1) is the vanadium tungsten titanium system or vanadium molybdenum titanium of inactivation
The honeycomb fashion or corrugated plate dst denitrating catalyst of system.
In the present invention, step (1) removes surface and hole inside ash using compressed air purging SCR catalyst, then will
SCR catalyst is placed in cleaning solution the impurity component for sufficiently washing away catalyst surface, is finally catalyzed treated SCR
Agent is put into blowing-type drying box dry, temperature programming to 60-120 DEG C of 2-12 hours dry, removing catalyst surface and inside
Remaining cleaning solution.
In the present invention, the cleaning formula of liquid are as follows: the bleeding agent of cleaning solution gross mass 0.1wt%-5.0wt% is accounted for,
The surfactant of 0.1wt%-5.0wt%, the acid of 90wt%-99.8wt%, the molar concentration of acid are 0.018-2.0mol/L, are adjusted
PH value is 2-5, is stirred 10-60 minutes, is uniformly mixed it, is configured to cleaning solution.The bleeding agent is isooctanol polyoxy second
One or more of alkene ether phosphate, polyoxyethylene lauryl ether phosphoric acid ester ammonium salt, alkyl phenol polyoxyethylene ether, preferably
Phosphate of Polyoxyethylene Isooctyl Ether；The surfactant is ammonium lauryl sulfate, fatty amine (alkylamine) polyoxy second
The one or more of the condensation product of alkene ether, fatty alcohol and ethylene oxide, preferably ammonium lauryl sulfate；The acid selects sulphur
One or more of acid, nitric acid, hydrochloric acid, oxalic acid, citric acid, preferably sulfuric acid.
In the present invention, it is 100-200 mesh that dried SCR denitration is crushed to granularity by step (2).It is wherein described
Discarded SCR catalyst and highly basic mass ratio be 10:3-5, the highly basic be organic alkali or inorganic strong alkali, preferably
Sodium hydroxide or diethylamine, more preferably diethylamine.Reaction temperature of the present invention is preferably 150-180 DEG C, when reaction
Between be 3-5 hours.The present invention can be added the potassium chlorate or hydrogen peroxide of 2wt%-5wt%, help to live when strong base solution is added
Property component it is abundant dissolution and recycling.Since SCR denitration is after using, vanadium therein is mainly with V2O5And VOSO4Form
In the presence of VOSO4Proportion is up to 10%-30%, therefore potassium chlorate or hydrogen peroxide in course of dissolution, can make spent vanadium catalyst
Contained in tetravalence vanadium be converted to pentavalent vanadium, facilitate it and sufficiently dissolve.
SCR regenerating flue gas denitrifying catalyst liquid of the present invention is prepared by aforementioned present invention method.Using prepared
Regenerated liquid decaying catalyst is regenerated, have favorable regeneration effect, SO2/SO3The features such as conversion ratio is low, regeneration cost is low.
Compared with prior art, the invention has the following advantages:
1, by being cleaned, drying, crushing, dissolving and being filtered acquisition containing sodium tungstate to discarded SCR denitration
With the high activity regenerated liquid of sodium vanadate, it can be restored to original active 90% or more using the catalyst activity after regenerated liquid regeneration,
And SO2/SO3Conversion ratio is less than 1%；
2, using the cleaning solution of specific composition and proportion, can sufficiently remove cohere on a catalyst make catalyst poisoning
Alkali and alkaline earth metal ions, effectively avoid it to the adverse effect of subsequent process, facilitate the active recovery of decaying catalyst；
3, potassium chlorate or hydrogen peroxide are added in highly basic course of dissolution, tetravalence vanadium contained in spent vanadium catalyst can be made to turn
It is melted into pentavalent vanadium, facilitates the abundant dissolution and recycling of active component；
4, simple, favorable regeneration effect, SO of the invention with regeneration technology2/SO3The features such as conversion ratio is low, regeneration cost is low,
It is regenerated suitable for industrial scale.It is regeneration and recycling and novel environment friendly to the toxic vanadium titanium catalyst of failing, cheap de-
The popularization and use of denox catalyst have a very important significance.
Specific embodiment
Below by specific embodiment, the present invention will be further described, and but the scope of the present invention is not limited thereto.
In the present invention, wt% is mass fraction.
Embodiment 1
It prepares cleaning solution: weighing Phosphate of Polyoxyethylene Isooctyl Ether 0.05Kg, ammonium lauryl sulfate 0.05Kg
(0.2%), molar concentration is the sulfuric acid 49.90Kg(99.8% of 0.5mol/L), it stirs 5 minutes, is uniformly mixed it, is configured to
50Kg cleaning solution.
(1) take certain factory's denitration activity by 90% be down to 30% the self-contained honeycomb catalyst of SCR denitration (150 × 150 ×
1000mm), it is purged 30 minutes with the oil-free drying compressed air of 0.2MPa, removes surface and hole inside ash.By purged catalysis
Agent is immersed in 50Kg cleaning solution, and cleaning solution is made to wash away catalyst 20 minutes, remove cohere on a catalyst make catalyst
Then catalyst is put into blowing-type drying box by the alkali and alkaline earth metal ions of poisoning, be warming up to the speed of 10 DEG C/min
100 DEG C, keep the temperature 2 h.
(2) by dried catalyst, catalyst block about 2000g is intercepted from middle part, after being slightly crushed with hammer, is put into
Rotating disintegrator crushes about 3 min, then stops pulverizer, takes out powder.Powder is put into beaker, 1 L 20wt% is added
Sodium hydroxide solution, 3 h are stirred to react under 160 DEG C of oil baths.
(3) pH value then is adjusted to 9 with sodium hydroxide solution, reuse vacuum filtration equipment filtering, filtrate is namely regenerated
Liquid.
Embodiment 2
It prepares cleaning solution: weighing 0.05 Kg of polyoxyethylene lauryl ether phosphoric acid ester ammonium salt, fatty amine (alkylamine) polyoxy
Vinethene 0.05Kg(0.2%), weigh the sulfuric acid 49.90Kg(99.8% that sour molar concentration is 0.5mol/L), it stirs 10 minutes, makes
It is uniformly mixed, and is configured to 50 Kg cleaning solutions.
(1) take certain factory's denitration activity by 90% be down to 20% the self-contained honeycomb catalyst of SCR denitration (150 × 150 ×
1000mm), it is purged 30 minutes with the oil-free drying compressed air of 0.2MPa, removes surface and hole inside ash.By purged catalysis
Agent is immersed in 50Kg cleaning solution, and cleaning solution is made to wash away catalyst 20 minutes, remove cohere on a catalyst make catalyst
Then catalyst is put into blowing-type drying box by the alkali and alkaline earth metal ions of poisoning, be warming up to the speed of 10 DEG C/min
110 DEG C, keep the temperature 2 h.
(2) by dried catalyst, about 3000 g of catalyst block is intercepted from middle part, after being slightly crushed with hammer, is put
Enter rotating disintegrator, crush about 3 min, then stop pulverizer, takes out powder.Powder is put into beaker, 1 L is added
The sodium hydroxide solution of 30wt% is stirred to react 3 h under 150 DEG C of oil baths.
(3) pH value then is adjusted to 9 with sodium hydroxide solution, reuse vacuum filtration equipment filtering, filtrate is namely regenerated
Liquid.
Embodiment 3
It prepares cleaning solution: weighing alkyl phenol polyoxyethylene ether 0.1Kg, ammonium lauryl sulfate 0.1Kg (0.4%) is weighed
Sour molar concentration is the sulfuric acid 49.80Kg (99.6%) of 0.5mol/L, is stirred 15 minutes, is uniformly mixed it, it is clear to be configured to 50Kg
Washing lotion.
(1) take certain factory's denitration activity by 90% be down to 40% the self-contained honeycomb catalyst of SCR denitration (150 × 150 ×
1000mm), it is purged 30 minutes with the oil-free drying compressed air of 0.2MPa, removes surface and hole inside ash.By purged catalysis
Agent is immersed in 50Kg cleaning solution, and cleaning solution is made to wash away catalyst 20 minutes, remove cohere on a catalyst make catalyst
Then catalyst is put into blowing-type drying box by the alkali and alkaline earth metal ions of poisoning, be warming up to the speed of 10 DEG C/min
100 DEG C, keep the temperature 2 h.
(2) by dried catalyst, about 4000 g of catalyst block is intercepted from middle part, after being slightly crushed with hammer, is put
Enter rotating disintegrator, crush about 3 min, then stop pulverizer, takes out powder.Powder is put into beaker, 1 L is added
The sodium hydroxide solution of 40wt% is stirred to react 3 h under 180 DEG C of oil baths.
(3) pH value then is adjusted to 10 with sodium hydroxide solution, reuse vacuum filtration equipment filtering, filtrate is namely regenerated
Liquid.
Embodiment 4
Process flow and operating condition with embodiment 1, the difference is that: step (2) be added strong base solution while add
Enter the hydrogen peroxide of 5wt%, finally prepares active regeneration liquid.
Embodiment 5
Process flow and operating condition with embodiment 2, the difference is that: step (2) be added strong base solution while add
Enter the potassium chlorate of 4wt%, finally prepares active regeneration liquid.
Embodiment 6
Process flow and operating condition with embodiment 1, the difference is that: the highly basic used in step (2) for diethylamine,
Finally prepare active regeneration liquid.
Comparative example 1
Process flow and operating condition with embodiment 1, the difference is that: be added strong base solution after do not adjust reaction solution
PH value prepares active regeneration liquid to 9-10.
Comparative example 2
Process flow and operating condition with embodiment 1, the difference is that: do not use cleaning solution of the present invention, adopt
The cleaning solution described in CN102059156A prepares active regeneration liquid.
Regenerate decaying catalyst using regenerated liquid prepared by embodiment 1-6 and comparative example 1-2, inactivation
SCR denitration refer to surface texture it is complete, without breakage, denitration activity loses urging for 30%-60% with raw catelyst compared with
Agent.Then regenerated catalyst and fresh catalyst activity are compared, and test the SO of regenerated catalyst2/SO3Conversion ratio.
Need to carry out concentration allotment before use to obtained regenerated liquid, vanadium concentration is calculated according to vanadium total amount in acidleach powder, and addition is gone
It is 5g/L that ionized water, which adjusts the vanadium concentration in regenerated liquid,.
Catalyst denitration activity test method of the present invention is as follows:
Experimental provision is anti-by air distribution system, flow control (mass flowmenter), gas mixer, gas preheater, catalysis
Device and flue gas analysis system is answered to constitute.Self-contained honeycomb catalyst (150 × 150 × 1000mm) is cut into small-sized detection block (45
× 45 × 50mm), small-sized detection block is then put into fixing tubular reactor.Simulated flue gas composition are as follows: NO, NH3、O2And
Carrier gas N2Composition, mixed gas total flow 608L/h, air speed 6000h-1, NH3/ NO=1, reaction temperature are controlled at 350 DEG C.Respectively
Gas flow is controlled by mass flowmenter and spinner flowmeter.Gas first passes through gas mixer mixing again before entering reactor
It is preheated by preheater.The NO concentration of air inlet and gas outlet is measured by flue gas analyzer.In order to eliminate the shadow of adsorption
It rings, system is in stable 20-30 minutes beginning collecting test of ventilating.
The catalytic activity of catalyst reflects that the denitration activity of NO is calculated by following formula by the denitration activity of NO:
Denitration activity=[(C0-C)/C0]×100%。
In formula, C0For NO initial concentration, C is NO concentration in gas after processing.
SO2/SO3Conversion ratio test is equally based on above-mentioned apparatus, and test temperature is 350 DEG C.Wherein SO2、SO3Content is adopted
It is measured with the chromatography of ions (GB/T-14642), 2% hydrogen peroxide solution, 10mmolNaOH+1%CH is respectively adopted3CHO solution absorbs
SO in gaseous mixture2、SO3, hydrogen peroxide is by SO2It is oxidized to SO4 2-, CH3CHO and SO3In conjunction with complex compound is generated, ion color is utilized
Spectrometer analyzes SO in absorbing liquid4 2-Content, and according to flue gas flow calculate flue gas in SO2、SO3Concentration, entire detection-phase
It is repeatedly measured by sampling, results are averaged.
SO2/SO3Conversion ratio calculation formula are as follows: SO2/SO3 conversion =(SO3o-SO3i)/SO2i×100%
Wherein: SO3oAnd SO3iRespectively reactor outlet and import SO3Concentration, μ L/L；SO2iFor Reactor inlet SO2
Concentration, μ L/L.
The performance test results of 1 regenerated catalyst of table
According to result above it is found that the denitrification rate of the catalyst after regeneration can be restored to 90% or more, while SO2/SO3Conversion
Rate is respectively less than 1%, meets the requirement of engineering.
Claims (8)
1. a kind of preparation method of SCR regenerating flue gas denitrifying catalyst liquid, it is characterised in that including following content:
(1) soot blowing, cleaning and drying process are carried out to discarded SCR denitrating catalyst；Clean the cleaning formula of liquid used are as follows:
Account for the bleeding agent of cleaning solution gross mass 0.1wt%-5.0wt%, the surfactant of 0.1wt%-5.0wt%, 90wt%-99.8wt%
Acid, acid molar concentration be 0.018-2.0mol/L, adjustings pH value be 2-5；The bleeding agent is isooctanol polyoxyethylene
One or more of ether phosphate, polyoxyethylene lauryl ether phosphoric acid ester ammonium salt, alkyl phenol polyoxyethylene ether；The table
Face activating agent be one of condensation product of ammonium lauryl sulfate, aliphatic amine polyoxyethylene ether, fatty alcohol and ethylene oxide or
It is several；The acid selects one or more of sulfuric acid, nitric acid, hydrochloric acid, oxalic acid, citric acid；
(2) dried SCR denitration is crushed, the strong base solution of 10wt%-40wt% is added at 150-200 DEG C of temperature
Reaction 3-8 hours；
(3) pH value of regulating step (2) reaction solution is separated by filtration to obtain the regenerated liquid containing sodium tungstate and sodium vanadate to 9-10.
2. according to the method described in claim 1, it is characterized by: step (1) the discarded SCR denitrating catalyst is to lose
The honeycomb fashion or corrugated plate dst denitrating catalyst of vanadium tungsten titanium system living.
3. according to the method described in claim 1, it is characterized by: step (1) is clear using compressed air purging SCR catalyst
Except surface and hole inside ash, then SCR catalyst is placed in cleaning solution to the impurity component for sufficiently washing away catalyst surface, most
Afterwards will treated that SCR catalyst is put into is dry in blowing-type drying box, temperature programming to 60-120 DEG C it is 2-12 hours dry,
Remove the cleaning solution of catalyst surface and internal residual.
4. according to the method described in claim 1, it is characterized by: the bleeding agent is isooctanol polyethoxylate phosphoric acid
Ester, surfactant sodium dodecyl base ammonium sulfate, acid select sulfuric acid.
5. according to the method described in claim 1, it is characterized by: the matter of discarded SCR catalyst and highly basic described in step (2)
For amount than being 10:3-5, highly basic is organic alkali or inorganic strong alkali.
6. according to the method described in claim 5, it is characterized by: the highly basic is sodium hydroxide or diethylamine.
7. according to the method described in claim 1, it is characterized by: when strong base solution is added, 2wt%- is added in step (2)
The potassium chlorate or hydrogen peroxide of 5wt%.
8. using the SCR regenerating flue gas denitrifying catalyst liquid of method as claimed in claim 1 to 7 preparation.
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| CN106378210A (en) * | 2016-08-19 | 2017-02-08 | 安徽元琛环保科技股份有限公司 | A regenerating cleaning solution for an SCR denitration catalyst and a regenerating method thereof |
| CN107185598B (en) * | 2017-05-25 | 2019-09-27 | 清华大学 | A kind of relieving haperacidity demercuration catalyst regeneration method |
| CN107459059A (en) * | 2017-08-22 | 2017-12-12 | 河钢股份有限公司承德分公司 | A kind of method that tungsten vanadium is realized from discarded SCR denitration and is efficiently carried altogether |
| CN108579822A (en) * | 2018-04-03 | 2018-09-28 | 洛阳理工学院 | The ultrasound-enhanced alkali soluble processing method of discarded SCR catalyst |
| CN108998670A (en) * | 2018-07-05 | 2018-12-14 | 安徽思凯瑞环保科技有限公司 | Thick titanium valve device and method thereof are extracted in SCR catalyst |
| CN110142064A (en) * | 2019-05-05 | 2019-08-20 | 上海电力学院 | A kind of denitrifying catalyst with selective catalytic reduction regeneration technology |
| CN111359627A (en) * | 2020-03-26 | 2020-07-03 | 闫巍 | Multistage regeneration method of denitration catalyst |
| CN112547136B (en) * | 2021-03-01 | 2021-05-11 | 中国科学院过程工程研究所 | Method for adjusting titanium-tungsten carrier pore channel in waste SCR denitration catalyst and application |
| CN113649083A (en) * | 2021-04-14 | 2021-11-16 | 太原科技大学 | Regeneration method of waste selective catalytic reduction catalyst for flue gas denitration |
| CN116549908A (en) * | 2023-05-22 | 2023-08-08 | 无锡华光环保能源集团股份有限公司 | Eluent for wet milling and eluting heavy metals in waste incineration fly ash and eluting method |
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