CN106607106A - Activity regenerating and performance optimizing method of SCR catalyst for sulfur, arsenic and phosphorus poisoning - Google Patents
Activity regenerating and performance optimizing method of SCR catalyst for sulfur, arsenic and phosphorus poisoning Download PDFInfo
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- CN106607106A CN106607106A CN201510711037.XA CN201510711037A CN106607106A CN 106607106 A CN106607106 A CN 106607106A CN 201510711037 A CN201510711037 A CN 201510711037A CN 106607106 A CN106607106 A CN 106607106A
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Abstract
Disclosed is an activity regenerating and performance optimizing method of a SCR denitration catalyst for sulfur, arsenic and phosphorus poisoning. The activity regenerating and performance optimizing method comprises the following steps that firstly, the ash deposition of the inactivation SCR denitration catalyst is swept, and then the SCR denitration catalyst is subjected to ultrasonic cleaning, rinsed cleanly through deionized water and impregnated with regeneration liquid; then, drying is conducted at the temperature of 100-150 DEG C, and calcination is conducted at the temperature of 350-450 DEG C; next, smashing, sifting, washing and pickling are conducted, and catalyst paste is obtained through wet smashing and grinding; and finally, the catalyst paste is mixed with metatitanic acid serous fluid, water and a trivalent titanium reducing agent are added to conduct bleaching after filtering, then, ammonium paratungstate and white carbon black are added to conduct stirring, filtering, dehydrating, calcining and smashing, and WO3-SiO2-TiO2 composite powder is obtained. The activity regenerating and performance optimizing method has the advantages that the denitrification rate of the catalyst is increased and all the properties of the catalyst such as the pore volume, the extrusion molding rate and the drying crack rate are improved effectively.
Description
Technical field
The present invention relates to SCR (SCR) field of denitration catalyst, and in particular to a kind of sulfur, arsenic and phosphorus
The regeneration of poisoning SCR catalyst and performance optimization method.
Background technology
The energy resource structure of China be based on coal, and the nitrogen oxides discharged after coal burning be Air Pollutant Discharge it
One, as NOx emission is increasingly serious, the control that China is discharged to nitrogen oxides (NOx) during " 12 " is increasingly
Strictly, it is reducing agent SCR (SCR) denitration technology because with efficient, reliable denitration performance with NH3
It is widely used in the denitrating system of coal-burning power plant.The principle of SCR denitration technology is in boiler emission flue gas to spray into NH3
Deng reducing agent, these reducing agents in the presence of catalyst with flue gas in NOx react generate harmless nitrogen and
Water.The core of SCR denitration technology is SCR catalyst, typical commercial SCR catalyst with TiO2 as carrier, with
The metal oxide containing precious metals such as V2O5-WO3 (MoO3) are active component.The mode of appearance of SCR denitration have honeycomb fashion,
Flat and corrugated plate dst.
With the growth of run time, can be because of the poisoning element such as surface sulfur, arsenic and phosphorus as the catalyst of SCR system core
Enrichment etc. and inactivate.Sulfur (S) poisoning be due to, after dust-removing desulfurating apparatus flue gas still contain micro SO2,
SO2 and NH3 gives birth to ` in the presence of catalyst into ammonium sulfate and ammonium hydrogen sulfate etc., and these ammonium sulfate salts can block catalysis
Agent duct and the active sites on covering catalyst surface, affect reactant diffusion in the catalyst and absorption, so that urging
Agent activity is reduced；It can be seen that the generation of sulfide is the direct result of catalyst sulfur poisoning on catalyst, high price sulfate
Formation make catalyst that irreversible poisoning to occur, as acid stronger carrier has good antitoxin performance, by adjusting
The Acidity of Aikalinity and addition auxiliary agent of carrier and active component form competitive Adsorption mode to improve the Sulfur tolerance of catalyst；Arsenic (As)
Poisoning is that As can be oxidized to gaseous As2O3 and be present in flue gas as ignition temperature is higher than 1400 DEG C, these
As2O3 molecules are entered in the micropore of catalyst, are reacted with O2 and V2O5, are formed As2O5 in catalyst surface, are led
Cause the destruction of catalyst activity component；The acid of arseniasiss catalyst is reduced and vanadium chemistry morphologic change, therefore changes carrier
Acid-base value, and arsenic component in catalyst is removed by related process, and possesses certain anti-arseniasiss ability, denitration
Rate is up to 81～88%, while the comprcssive strength and tear strength of catalyst can be kept；By adjusting the master that phosphorus (P) is poisoned
The V and W for wanting reason to be that P is instead of in V-OH and W-OH, generates P-OH, and its acidity is not so good as V-OH and W-OH, only
Weaker acidic site can be provided, cause absorption of the catalyst to NH3 weaken；In addition, P also can and catalyst surface
V=O active sites react, and generate the materials such as VOPO4, so as to reduce the quantity of active sites；By being concisely and efficiently
Mode removes the phosphorus component for causing catalyst poisoning, while supplementing impaired active component, makes catalyst recover which higher
Denitration activity, while possessing certain anti-phosphorism ability.
Can not meet when SCR catalyst activity drops to《Fossil-fuel power plant atmospheric pollutant emission standard》Requirement when, just need
Change, generally 3 years its replacement cycle, renewal cost accounts for the 50% of SCR system total price.Regeneration expense is only accounted for entirely
Portion changes the 30% of catalyst costs, and saves the cost for processing spent catalyst.And for because in sulfur, arsenic and phosphorus
The SCR catalyst of poison and inactivation, generally requires to bake through 350～450 DEG C of temperature, the powder that usual the method is obtained
Surface area per unit volume product is not high, and particle diameter is larger, so as to catalytic performance is not high.Therefore, for depositing because of sulfur, arsenic and P elements
And be poisoned SCR catalyst, regeneration while, recover and improve catalysis activity, optimize its regeneration after catalytic
Can, while having highly important economic benefit, environmental benefit.
The content of the invention
Above-mentioned deficiency of the present invention for prior art, there is provided a kind of to cause catalyst using being concisely and efficiently mode and removing
The sulfur of poisoning, arsenic and phosphorus component, supplement impaired active component, make catalyst recover its higher denitration activity, possess
Certain sulfur resistive, arsenic and phosphorism ability, while the denitrification percent of catalyst can also be improved, the hole of catalyst is effectively improved
The SCR denitration regeneration of the sulfur, arsenic and phosphorism of the properties such as volume, extrusion molding rate, scasoning check rate
And performance optimization method.
In order to solve above-mentioned technical problem, the present invention is employed the following technical solutions：The SCR of a kind of sulfur, arsenic and phosphorism takes off
Denox catalyst regenerates and performance optimization method, and step includes：
(1) with pressure be 2～6MPa, flow be 0.5～1.0m3The cleaning drying compressed air purging inactivation of/s
SCR denitration, to remove the dust stratification on surface, the time is 10～20min；
(2) catalyst after process soot blowing is placed in ultrasonic wave added in alkaline cleaning fluid and cleans, 20～60min of time,
100～500w of ultrasonic power；
(3) by the catalyst deionized water rinsed clean after step (2) cleaning；
(4) catalyst of rinsed clean is impregnated in regenerated liquid, to remove the arsenic and phosphorus composition of residual, while supplementing
Impaired active component, 1～4h of dip time；
(5) catalyst after dipping regenerated liquid is dried into 1～3h at 100～150 DEG C, then 350～450
2～5h of roasting at DEG C, that is, the SCR denitration after being regenerated；
(6) it is the SCR denitration after regeneration is stand-by through crushing, sieving, wash, after pickling；
(7) catalyst slurry will be obtained through the catalyst after step (6) preliminary treatment through waterproof pulverization, grinding；
(8) catalyst slurry of step (7) is mixed with metatitanic acid (hydrated titanium dioxide) serosity, obtains mixing slurry
Liquid；
(9) by the mixed serum of step (8) after washing, filtering means dehydration obtains filter cake, adjusts pH to 1.5-2.0,
Water, titanous Bleached are added, is reacted to after the completion of under conditions of 90 DEG C, is cooled to room temperature；
(10) (titanium dioxide herein comes from step the serosity after step (9) process to be added water to titanium dioxide
Suddenly the metatitanic acid in (8)) 23-25wt% of serosity is accounted for, pH 7.5-8.0 are adjusted, the content of ammonium tungstate to WO3 is added
For 5-7wt%, the content of addition white carbon to SiO2 is 5-7wt%, stirs, filters, is dehydrated, calcines, crushes (60-100
Mesh), WO3-SiO2-TiO2 composite powders are obtained, wherein, the content of the WO3 refers to the quality of the WO3 and accounts for
The ratio of WO3-SiO2-TiO2 composite powder quality, the content of the SiO2 refer to the quality of the SiO2 and account for
The ratio of WO3-SiO2-TiO2 composite powder quality.
Wherein, step (2) alkaline cleaning fluid is that strong base-weak acid salt and surfactant are molten with the mixing that water is obtained by mixing
Liquid, strong base-weak acid salt are one or more of sodium carbonate, sodium acetate, sodium sulfite or sodium silicate, in mixed solution
Concentration is 0.1～2mol/L；Surfactant be fatty alcohol-polyoxyethylene ether (AEO), micropore permeation agent JFC or
One or more of alkyl phenol polyoxy ether (OP-10 alkylphenol polyoxyethylene), the content in mixed solution is
0.2～1wt%；Balance of deionized water.
Wherein, step (4) regenerated liquid consists of ammonium salt, weak acid, ammonium metavanadate and ammonium molybdate and deionized water
The mixed solution of composition, ammonium salt is one or two of ammonium chloride or ammonium nitrate, the concentration in mixed solution is 0.1～
2mol/L；Weak acid is one or more of oxalic acid, acetic acid or citric acid, and the content in mixed solution is 0.1～1wt
%；Content of the ammonium metavanadate in mixed solution is 0.5～4wt%；Content of the ammonium molybdate in mixed solution be
1～6wt%；Balance of deionized water.
Wherein, comprise the following steps in the step (6)：1. crush：It is catalyzed with blade type or hammer crushing crusher machine
Agent, obtains the fragment of a diameter of 0.5-1cm；2. sieve：Fragment after above-mentioned crushing is crossed into the sieve of 50-80 mesh；3. water
Wash：By the catalyst after sieving add water flushing, filter, to remove the flue dust such as carbon deposit, the metal deposit of catalyst surface；
4. pickling：By the catalyst soak after washing in acid solution 1-2 hours, wherein, the acid solution can be
Sulphuric acid or nitric acid, concentration are 0.5-1M (mol/l)；Pickling can remove infiltration or be attached in discarded SCR catalyst
Alkali metal, alkaline-earth metal, arsenic or phosphorus etc..
Wherein, in the step (7), the concentration of catalyst slurry is 26-30wt%, and in the slurry, catalyst is a diameter of
20-100nm, makes the size and the metatitanic acid serosity for needing to mix in following step (8) mixed serum step of the catalyst
In the crystalline size of metatitanic acid be close so that the catalyst slurry is merged completely with metatitanic acid serosity, after making
The washing of continuous step (9) and blanching step and the better processing effect of finished product preparation process, final obtained SCR catalysis
Agent carrier function admirable, and catalyst also has preferable performance by obtained in the carrier.The catalyst particle size can be with
30-80nm is ground to, further preferably 30-50nm.
Wherein, in the metatitanic acid serosity of the step (8), the content of titanium dioxide is 190-230g/L, catalyst slurry
The mass ratio that body is mixed with metatitanic acid serosity is 1: 1-9.
Wherein, in step (9) washing and blanching step, sulfur acid for adjusting pH can be added to 1.5-2.0.The sulfur
Acid can also further remove sodium ion in catalyst, potassium ion etc., after adding water in addition to it can be used to adjust pH
The concentration for adjusting mixed serum is 30wt%, and titanous reducing agent includes but is not limited to titanium sulfate, can also such as adopt three
Titanium chloride.
Wherein, ammonia can be added in described step (10) to adjust pH to 7.5-8.0.Serosity is after filtering means dehydration
Filter cake is obtained, the content of titanium dioxide (containing titanium dioxide inside metatitanic acid serosity) is 44-46wt% in the filter cake, is filtered
The calcining of cake, calcines under less than 550 DEG C of (400-550) DEG C temperature conditionss, and the time is 3.5-6 hours, is obtained
To WO3-SiO2-TiO2 composite powders.
The advantages of the present invention：
(1) cleanout fluid used by the present invention is presented alkalescence, can be maximally maintained while except desulfuration composition
The comprcssive strength of catalyst, tear strength and active component；Surfactant is with the addition of in cleanout fluid, and it is auxiliary using ultrasound
Cleaning is helped, cleaning efficiency is greatly improved；
(2) ammonium salt and weak acid for containing in regenerated liquid of the invention can further remove a small amount of sulphur component of residual, reach
To the purpose being fully cleaned up；Regenerated liquid can also be catalyst make-up active component so as to which denitration activity is further enhanced；
The ammonium molybdate of addition can make the catalyst after regeneration obtain certain anti-arseniasiss ability.
(3) to being regenerated using this method after SCR denitration carry out denitration activity detection, it is found that its denitration rate can
Up to 81～88%.
(4) particle diameter for 20-100nm catalyst slurry mix into metatitanic acid serosity after, through washing step, Neng Gouzai
The secondary free acid and other impurities for efficiently separating waste catalyst, can effectively meet catalysis through techniques such as bleaching, calcinings
Every technical requirements of agent carrier titanium dioxide；
(5) as the alkaline cleaning fluid for adopting is the mixed solution of strong base-weak acid salt and surfactant；Acid reclaim liquid
It is made up of ammonium salt, weak acid, ammonium metavanadate and ammonium molybdate.And technical process includes that mechanical ash removing, alkaline cleaning fluid are clear
Wash, regenerated liquid impregnates and is dried；Ammonium tungstate, white carbon etc. are with the addition of particularly and using works such as pickling, bleaching, calcinings
Skill significantly improves components such as alkali metal, alkaline-earth metal, arsenic or the phosphorus that removing is attached in discarded SCR catalyst etc.
Performance.
(6) the laser particle D50 and ratio of the SCR catalyst carrier obtained by reclaiming method of the present invention
Surface area is satisfied by standard requirement, and the catalyst by obtained in the carrier can not only effectively improve denitrification percent, meets catalysis
Outside the indices of agent, additionally it is possible to effectively improve the pore volume of catalyst, extrusion molding rate, horizontal mechanical strength,
Longitudinal mechanical strength, reduces scasoning check rate and wear rate.
Specific embodiment
With reference to embodiment, make detailed description further to the present invention, but embodiments of the present invention are not limited to
This.
Embodiment 1
(1) prepared by solution：
Cleanout fluid：0.8mol/L sodium carbonate, 0.3wt%AEO；
Regenerated liquid：1mol/L ammonium chloride, 0.6wt% oxalic acid, 2wt% ammonium metavanadates, 4wt% ammonium molybdates.
(2) technological process
Samples taken is the vanadium tungsten titanium system denitrating catalyst that certain power plant has run 23000 hours, finds denitration rate after testing
For 53%, deactivation cause is serious arseniasiss.First, using 3MPa, flow 0.5m3The compressed gas of/s are to arsenic
The denitrification catalyst module of poisoning carries out purging 10min；Secondly, the catalyst that purging is finished is inserted into ultrasound in cleanout fluid
Auxiliary cleaning 30min, is rinsed using deionized water；Then, the catalyst after process be impregnated in into 3h in regenerated liquid；
Finally, 2h is dried to catalyst using 120 DEG C of hot-air.SCR denitration regenerative process terminates.To again
Catalyst after life carries out denitration activity test, it is found that its denitration rate returns to 88% by 53%.
25 kilograms of catalyst after regeneration is weighed, Jing plastic breakers are broken into the fractionlet of 0.5-1cm, cross the shake of 50 mesh
Dynamic sieve, and the flushing dust that adds water, the catalyst debris rinsed well are put in the dust technology that 60 kilograms of concentration are 1M
Immersion 1-2 hours, after filtration, size-reduced machine waterproof pulverization adds water 50 kilograms, and catalyst slurry bulk concentration is controlled in 26wt%,
Enter sand mill superfine grinding, sampling detection particle diameter is qualified in 20-50nm；Unqualified secondary beating；Particle diameter is qualified
Catalyst slurry and metatitanic acid serosity afterwards mixes for 1: 1 ratio according to mass ratio, and in the metatitanic acid serosity, TiO2 contains
Measure as 190g/l, once washed 1.5 hours, secondary water is carried out after filter pressing and is washed, after washing 3 hours, take a small amount of filter
Liquid detected with 1% potassium ferricyanide solution, represents cleaned during in yellow；Cleaned filter cake is put into into Bellmer, sulfur is added
About 60 liters of acid adjusts the pH value of serosity to 1.5, plus 30 kilograms of pure water, adjusts slurry concentration about 30wt%, plus titanous
About 1 kilogram of reducing agent (titanium sulfate), controls 90 DEG C of reduction temperature, is incubated 1 hour, is cooled to room temperature；By above-mentioned slurry
Liquid adds tank of sizing mixing, pure water to titanium dioxide to account for 23wt% of total serosity or so, and it is 7.5 that ammonification water adjusts pH, adds secondary tungsten
Acid amide and White Carbon black, addition meet claimed below respectively：WO3 contents account for the 5wt% of titanium tungsten composite powder, SiO2 contents
Account for the 5wt% of titanium tungsten composite powder；Stirring 30min, opening press filter are filtered, and filter cake 44wt% containing titanium dioxide enters
Rotary kiln is calcined, and less than 550 DEG C, calcining is finished high-temperature region temperature control, is entered pulverizer crushing, is obtained titanium tungsten composite powder
(that is, WO3-SiO2-TiO2 composite powders).
Embodiment 2
(1) prepared by solution
Cleanout fluid：0.5mol/L sodium carbonate, 0.3wt% peregals 0；
Regenerated liquid：1mol/L ammonium chloride, 0.6wt% oxalic acid, 2wt% ammonium metavanadates, 4wt% ammonium molybdates.
(2) technological process
Samples taken is the vanadium tungsten titanium system denitrating catalyst that certain power plant has run 23000 hours, finds that denitration rate is after testing
53%, deactivation cause is serious arseniasiss.First, using 3MPa, flow 0.5m3/s compressed gas to arseniasiss
Denitrification catalyst module carry out purging 10min；Secondly, the catalyst that purging is finished is inserted into ultrasonic wave added in cleanout fluid
Cleaning 30min, is rinsed using deionized water；Then, the catalyst after process be impregnated in into 3h in regenerated liquid；Most
Afterwards, 2h is dried to catalyst using 120 DEG C of hot-air.SCR denitration regenerative process terminates.To regeneration
Catalyst afterwards carries out denitration activity test, it is found that its denitration rate returns to 82% by 53%.
25 kilograms of catalyst after regeneration is weighed, Jing plastic breakers are broken into the fractionlet of 0.5-1cm, cross the shake of 50 mesh
Dynamic sieve, and the flushing dust that adds water, the catalyst debris rinsed well are put in the dust technology that 60 kilograms of concentration are 1M
Immersion 1-2 hours, after filtration, size-reduced machine waterproof pulverization, the regulation catalyst slurry bulk concentration that adds water are controlled in 30wt%,
Enter sand mill superfine grinding, sampling detection particle diameter is qualified in 50-100nm；Unqualified secondary beating；Particle diameter is closed
Catalyst slurry and metatitanic acid serosity after lattice mixes for 1: 9 ratio according to mass ratio, TiO2 in the metatitanic acid serosity
Content is 230g/l, is once washed 1.5 hours, carries out secondary water and wash after filter pressing, after washing 3 hours, is taken a small amount of
Filtrate detected with 1% potassium ferricyanide solution, represents cleaned during in yellow；Cleaned filter cake is put into into Bellmer, is added
Sulphuric acid adjusts the pH value of serosity to 2.0, plus 30 kilograms of pure water, adjusts slurry concentration about 30wt%, plus titanous reducing agent (sulfur
Sour titanium) about 1 kilogram, 90 DEG C of reduction temperature is controlled, 1 hour is incubated, is cooled to room temperature；Above-mentioned serosity is added and is sized mixing
Tank, plus pure water to titanium dioxide accounts for 23wt% of total serosity or so, it is 8.0 that ammonification water adjusts pH, adds para-tungstic acid amine and white
Carbon black, addition meet claimed below respectively：WO3 contents account for the 5wt% of titanium tungsten composite powder, and it is multiple that SiO2 contents account for titanium tungsten
Close the 5wt% of powder；Stirring 30min, opening press filter are filtered, filter cake 46wt% containing titanium dioxide, enter rotary kiln calcining, high temperature
Less than 550 DEG C, calcining is finished area's temperature control, is entered pulverizer crushing, is obtained titanium tungsten composite powder and according to embodiment 1
Mode is prepared into SCR catalyst.
Comparative example 1
The SCR catalyst being poisoned is regenerated using raw material same as Example 1 and processing method, this comparative example 1
With the difference is that only for embodiment 1, a diameter of 450nm of catalyst particle in catalyst slurry.
Comparative example 2
The SCR catalyst being poisoned is regenerated using raw material same as Example 1 and processing method, this comparative example 1
With reality
The difference is that only for example 1 is applied, a diameter of 260nm of catalyst particle in catalyst slurry.
The component of 1 waste catalyst of table and titanium tungsten composite powder and performance synopsis
2 catalyst application performance of table is detected
Wherein, " agreement " in upper table 1 represents that the specific surface area has no clear and definite its critical field, and normally, this compares table
The value of area is bigger, and the performance of catalyst carrier is better.
By embodiment 1-2 in upper table 1-2, it can be seen that the SCR catalyst carrier prepared using this method, it is harmful to
Impurity content is effectively rejected, and is met and is required, the index such as crystalline size and specific surface area reaches wanting for SCR catalyst carrier
Ask；The catalyst Deitrogenatin efficiency prepared with this, intensity etc. can meet the requirement of SCR catalyst, and this method can yet be regarded as one
Plant the good method for recycling of discarded SCR catalyst economical and efficient.
Compared by embodiment 1 and comparative example 1-2, it can be seen that catalyst is ground to into scope of the present invention
It is interior, i.e. after 20-100nm, then be mixed with titanium tungsten composite powder with metatitanic acid serosity, its laser particle D50 and compare table
Area compared with comparative example 1-2 (catalyst particle size is not in the range of 20-100nm) titanium tungsten composite powder it is good.And,
SCR catalyst, the items of SCR catalyst by obtained in embodiment 1 are obtained using identical method on the basis of the carrier
Performance is also significantly better than the properties of SCR catalyst obtained in comparative example 1-2.
And generally discarded SCR catalyst is carried out after preliminary treatment in prior art, 1 is by means such as bleaching, calcinings
Catalyst is directly obtained, 2 is the activity for recovering catalyst by soaking the means such as recovered liquid, roasting, and the former is typically right
Catalyst powder is broken to hundreds of purpose degree, i.e., be generally crushed to micron level, and the latter is directly by catalyst in recovered liquid
Harmful ion is removed, there is no the crushing of catalyst.
And find during catalyst slurry after treatment and metatitanic acid serosity to be mixed with titanium tungsten composite powder,
Particle diameter of the catalyst when mixing with metatitanic acid has considerable influence, such as upper table to the performance for preparing catalyst carrier and catalyst
As data display shown in 1-2, it is that the catalyst slurry in the range of 20-100nm is mixed with metatitanic acid serosity in particle diameter
The titanium tungsten composite powder and catalyst for preparing is closed, its properties can be only achieved optimum.
The above, is only presently preferred embodiments of the present invention, not makees any pro forma restriction to the present invention, according to
According to the technical spirit of the present invention, within the spirit and principles in the present invention, what above example was made any simply repaiies
Change, equivalent with improve etc., still fall within the protection domain of technical solution of the present invention.
Claims (10)
1. the SCR denitration of a kind of sulfur, arsenic and phosphorism regenerates and performance optimization method, and its feature exists
In：Step includes：
(1) with pressure be 2-6MPa, flow be 0.5-1.0m3The cleaning drying compressed air purging inactivation of/s
SCR denitration, to remove the dust stratification on surface, the time is 10-20min；
(2) catalyst after process soot blowing is placed in alkaline cleaning fluid ultrasonic wave added cleaning, and time 20～
60min, ultrasonic power 100-500w；
(3) alkalescence for the catalyst deionized water rinsing after step (2) cleaning being removed clean catalyst is clear
Washing liquid；
(4) catalyst of rinsed clean is impregnated in regenerated liquid, to remove the arsenic and phosphorus composition of residual, same
When supplement impaired active component, dip time 1-4h；
(5) catalyst after dipping regenerated liquid is dried into 1-3h at 100-150 DEG C, then at 350-450 DEG C
Lower roasting 2-5h, that is, the SCR denitration after being regenerated；
(6) by the SCR denitration after regeneration through crushing, sieve, washing, pickling；
(7) catalyst slurry will be obtained through the catalyst after step (6) process through waterproof pulverization, grinding
Body；
(8) catalyst slurry of step (7) is added in metatitanic acid serosity and is mixed, obtain mixing slurry
Liquid；
(9) by the mixed serum of step (8) after washing, filtering means dehydration obtains filter cake, adjusts filter cake
PH to 1.5-2.0, is subsequently adding water and titanous reducing agent is bleached, and reacts under conditions of 85-95 DEG C
To after the completion of, room temperature is cooled to；
(10) serosity after step (9) process is added water to into the 23-25wt% that titanium dioxide accounts for serosity,
PH 7.5-8.0 are adjusted, and ammonium paratungstate are subsequently adding to WO3Content be 5-7wt%, add white carbon to SiO2's
Content is 5-7wt%, stirring, filtration, dehydration, calcining, crushing, obtains WO3-SiO2-TiO2Composite powder, wherein,
The WO3Content refer to the WO3Quality account for WO3-SiO2-TiO2The ratio of composite powder quality, it is described
SiO2Content refer to the SiO2Quality account for WO3-SiO2-TiO2The ratio of composite powder quality.
2. the SCR denitration regeneration of sulfur according to claim 1, arsenic and phosphorism and performance are excellent
Change method, it is characterised in that：Step (2) alkaline cleaning fluid be strong base-weak acid salt and surfactant with
The mixed solution that water is obtained by mixing, strong base-weak acid salt for sodium carbonate, sodium acetate, sodium sulfite or sodium silicate
Plant or several, the concentration in mixed solution is 0.1～2mol/L；Surfactant is fatty alcohol polyoxy second
One or more of alkene ether, micropore permeation agent JFC or alkyl phenol polyoxy ether, the content in mixed solution
For 0.2～1wt%；Balance of deionized water.
3. the SCR denitration regeneration and performance optimization of sulfur according to claim 1, arsenic and phosphorism
Method, it is characterised in that：Step (4) regenerated liquid consists of ammonium salt, weak acid, ammonium metavanadate and molybdenum
The mixed solution that sour ammonium and deionized water are constituted, ammonium salt are one or two of ammonium chloride or ammonium nitrate, in mixing
Concentration in solution is 0.1～2mol/L；Weak acid is one or more of oxalic acid, acetic acid or citric acid,
Content in mixed solution is 0.1～1wt%；Content of the ammonium metavanadate in mixed solution be 0.5～
4wt%；Content of the ammonium molybdate in mixed solution is 1～6wt%；Balance of deionized water.
4. the SCR denitration regeneration and performance optimization of sulfur according to claim 1, arsenic and phosphorism
Method, it is characterised in that：Comprise the following steps in the step (6)：1. crush：With blade type or hammer
Crusher in crushing catalyst, obtains the fragment of a diameter of 0.5-1cm；2. sieve：By the fragment after above-mentioned crushing
Cross the sieve of 50-80 mesh；3. wash：By the catalyst after sieving add water flushing, filter；4. pickling：To pass through
Catalyst soak after washing 1-2 hours in acid solution, wherein, the acid solution is sulphuric acid or nitric acid,
Concentration is 0.5-1M.
5. the SCR denitration regeneration and performance optimization of sulfur according to claim 1, arsenic and phosphorism
Method, it is characterised in that：In the step (7), the concentration of catalyst slurry is 26-30wt%, in the slurry
A diameter of 20-100nm of catalyst.
6. the SCR denitration regeneration and performance optimization of sulfur according to claim 5, arsenic and phosphorism
Method, it is characterised in that：A diameter of 30-80nm of catalyst.
7. the SCR denitration regeneration and performance optimization of sulfur according to claim 6, arsenic and phosphorism
Method, it is characterised in that：A diameter of 30-50nm of catalyst.
8. the SCR denitration regeneration and performance optimization of sulfur according to claim 1, arsenic and phosphorism
Method, it is characterised in that：In the metatitanic acid serosity of the step (8), the content of titanium dioxide is 190-230g/L,
The mass ratio that catalyst slurry is mixed with metatitanic acid serosity is 1: 1-9.
9. the SCR denitration regeneration and performance optimization of sulfur according to claim 1, arsenic and phosphorism
Method, it is characterised in that：In step (9) washing and blanching step, sulfur acid for adjusting pH can be added extremely
1.5-2.0。
10. the SCR denitration regeneration of sulfur according to claim 1, arsenic and phosphorism and performance are excellent
Change method, it is characterised in that：Ammonia is added to adjust pH to 7.5-8.0 in described step (10).
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| CN109317221A (en) * | 2017-08-01 | 2019-02-12 | 神华集团有限责任公司 | Inactivate the regeneration method of denitrating catalyst |
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| CN113477083A (en) * | 2021-07-05 | 2021-10-08 | 国家电投集团远达环保催化剂有限公司 | Regeneration method of inactivated denitration dedusting ceramic tube |
| CN114558625A (en) * | 2022-03-14 | 2022-05-31 | 龙净科杰环保技术（上海）有限公司 | SCR denitration catalyst regeneration process in steel industry |
| CN115957826A (en) * | 2023-01-18 | 2023-04-14 | 常熟理工学院 | Low-temperature plasma irradiation regeneration method of waste denitration catalyst and regenerated denitration catalyst |
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| CN115957826A (en) * | 2023-01-18 | 2023-04-14 | 常熟理工学院 | Low-temperature plasma irradiation regeneration method of waste denitration catalyst and regenerated denitration catalyst |
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