CN114588891A - Denitration catalyst and preparation method and application thereof - Google Patents

Denitration catalyst and preparation method and application thereof Download PDF

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Publication number
CN114588891A
CN114588891A CN202210153648.7A CN202210153648A CN114588891A CN 114588891 A CN114588891 A CN 114588891A CN 202210153648 A CN202210153648 A CN 202210153648A CN 114588891 A CN114588891 A CN 114588891A
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denitration catalyst
product
biomass
flue gas
denitration
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冯树臣
陈璟
严泽宇
王慧芳
王天堃
邢刚
刘奕宁
顾永正
王哲峰
许浩杰
朱振武
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GD Power Development Co Ltd
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GD Power Development Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/32—Manganese, technetium or rhenium
    • B01J23/34—Manganese
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8628—Processes characterised by a specific catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/74—Iron group metals
    • B01J23/755—Nickel
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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Abstract

The application provides a denitration catalyst, a preparation method and an application thereof, relates to the field of environmental protection, and solves the problem that the operation cost of the existing SCR denitration system is high. The preparation method of the denitration catalyst comprises the following steps: placing biomass in a hydrothermal reaction kettle for reaction to obtain a first product; mixing the first product with potassium carbonate to obtain a second product; and calcining the second product to obtain the denitration catalyst. The denitration catalyst and the preparation method and application thereof are used for SCR denitration.

Description

Denitration catalyst and preparation method and application thereof
Technical Field
The application relates to the field of environmental protection, in particular to a denitration catalyst and a preparation method and application thereof.
Background
SCR denitration technology is mostly adopted in thermal power plant to remove NO in coal-fired flue gasX。
In the SCR denitration process, the catalyst is the core part of the process. At present, catalysts adopted in the SCR denitration reactor are high in price (such as some precious metal denitration catalysts), and need to be replaced regularly, so that the operation cost of an SCR denitration system is high.
Disclosure of Invention
The application provides a denitration catalyst, a preparation method and an application thereof, which can be used for solving the technical problem that the operation cost of the existing SCR denitration system is high.
In a first aspect, an embodiment of the present application provides a preparation method of a denitration catalyst, where the method includes:
placing biomass in a hydrothermal reaction kettle for reaction to obtain a first product;
mixing the first product with potassium carbonate to obtain a second product;
and calcining the second product to obtain the denitration catalyst.
Optionally, in one embodiment, before the placing the biomass in the hydrothermal reaction kettle for reaction, the preparation method further comprises:
and (3) crushing the biomass.
Optionally, in an embodiment, after the biomass is subjected to the pulverization treatment, the preparation method further includes:
washing the biomass.
Optionally, in one embodiment, after the biomass is placed in the hydrothermal reaction kettle for reaction, the preparation method further includes:
and putting a product obtained by the reaction in the hydrothermal reaction kettle into a metal salt solution for impregnation, and obtaining the first product after impregnation.
Optionally, in one embodiment, the biomass comprises any one or more of walnut shells, bagasse, corn cobs, straw, peanut shells.
Optionally, in one embodiment, the reaction temperature of the biomass in the hydrothermal reaction kettle is 100 ℃ to 150 ℃, the reaction pressure is 3.0MPa to 25MPa, and the reaction time is 2h to 12 h.
Optionally, in one embodiment, the metal salt solution comprises any one of a manganese sulfate solution, a copper nitrate solution, and a nickel acetate solution.
In a second aspect, embodiments of the present application provide a denitration catalyst prepared according to the preparation method provided in the first aspect of the embodiments of the present application.
In a third aspect, an embodiment of the present application provides an application of the denitration catalyst provided in the second aspect of the embodiment of the present application, where the denitration catalyst is applied in an exhaust gas flue gas pipeline after a denitration reactor.
Optionally, in an embodiment, the application further includes:
the flue gas temperature in the tail gas flue gas pipeline is controlled to be 180-220 ℃, and the flue gas flow rate is less than or equal to 16 m/s.
The beneficial effect that this application brought is as follows:
by adopting the scheme provided by the embodiment of the application, the preparation method of the denitration catalyst comprises the following steps: placing biomass in a hydrothermal reaction kettle for reaction to obtain a first product; mixing the first product with potassium carbonate to obtain a second product; calcining the second product to obtain the denitration catalyst; because the denitration catalyst can be prepared based on the biomass with low price, the price of the denitration catalyst can be reduced, and the running cost of an SCR denitration system can be further reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts. In the drawings:
fig. 1 is a schematic flow chart of a preparation method of a denitration catalyst provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of an SCR denitration system according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of another SCR denitration system provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of another SCR denitration system provided in an embodiment of the present application.
Reference numerals:
20-SCR denitration system; 201-SCR denitration reactor; 202-tail gas flue gas pipeline; 203, a dust remover; 204 — catalyst storage; 205-catalyst injection line; 206-flue gas conveying pipeline; 207-first branch line.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The features of the terms first and second in the description and in the claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/", and generally means that the former and latter related objects are in an "or" relationship.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
As described in the above background art, currently, the SCR denitration process is mostly adopted in thermal power plants to remove NO from coal-fired flue gasX. In the SCR denitration process, the catalyst used in the SCR denitration reactor is expensive and needs to be replaced periodically, which results in higher operation cost of the SCR denitration system.
Based on this, the embodiment of the present application provides a denitration catalyst, and as shown in fig. 1, a preparation method of the denitration catalyst may include the following steps:
step 101, placing biomass in a hydrothermal reaction kettle for reaction to obtain a first product.
Wherein, the biomass can comprise any one or more of walnut shells, bagasse, corncobs, straws and peanut shells.
The hydrothermal reaction kettle can also be called as a hydrothermal carbonization reaction kettle, and biomass can be subjected to carbonization reaction in the hydrothermal reaction kettle to obtain loose and porous biochar. In practical application, in order to further improve the specific surface area of the biochar obtained by the reaction and further improve the catalytic effect of the denitration catalyst, the biomass is placed in a hydrothermal reaction kettle for reaction at the reaction temperature of 100-150 ℃, the reaction pressure of 3.0-25 MPa, and the reaction time is 2-12 h.
In the embodiment of the present application, the first product may be biochar obtained by carbonizing the biomass.
And 102, mixing the first product with potassium carbonate to obtain a second product.
The first product is mixed with potassium carbonate, and specifically, the first product solution is mixed with a potassium carbonate solution to perform an impregnation operation. The ratio of the first product solution to the potassium carbonate solution may be specifically set according to actual conditions, for example, 100ml of the first product solution may be mixed with 100ml of the potassium carbonate solution, the 100ml of the first product solution contains 0.6g of biochar, and the 100ml of the potassium carbonate solution contains 0.25g of potassium carbonate (it is understood that the loading amount of potassium carbonate is 25%).
In order to sufficiently impregnate the biochar in the potassium carbonate solution, after the first product solution is mixed with the potassium carbonate solution, the mixed solution can be stirred, for example, for several hours by using a magnetic stirrer.
In practical application, in order to improve the efficiency of the denitration catalyst prepared by calcination treatment, after impregnation is completed, the mixed solution of the first product solution and the potassium carbonate solution can be placed in an oven for drying.
The second product may be a product obtained by immersing biochar in a potassium carbonate solution, and further, may be a product obtained by drying.
And 103, calcining the second product to obtain the denitration catalyst.
The second product is subjected to a calcination treatment, and specifically, the second product may be subjected to a calcination treatment in a tube furnace. The temperature and the time period for carrying out the calcination treatment can be set according to actual conditions. In a preferred embodiment, the calcination treatment is carried out at a temperature of 800 ℃ for a time period of 1 to 1.5 hours, based on which a denitration catalyst having a good catalytic activity can be obtained.
It can be understood that, with the preparation method of the denitration catalyst provided in the above embodiments of the present application, the method includes placing biomass in a hydrothermal reaction kettle to perform a reaction, so as to obtain a first product; mixing the first product with potassium carbonate to obtain a second product; calcining the second product to obtain the denitration catalyst; because the embodiment of the application can prepare the denitration catalyst based on the biomass with low price, the price of the denitration catalyst can be reduced, and the running cost of the SCR denitration system can be reduced.
On the other hand, China, as a traditional agricultural kingdom, can generate a large amount of biological waste materials such as corn straws and wheat straws every year, and the waste materials are usually subjected to incineration treatment, so that the air pollution is caused while the resource waste is caused; and this application can not only reduce SCR deNOx systems's running cost, can also protect the atmospheric environment based on these living beings waste materials preparation denitration catalyst.
In order to fully carbonize the biomass to obtain loose and porous biochar, in an embodiment, before the biomass is placed in the hydrothermal reaction kettle for reaction in step 101, the preparation method of the denitration catalyst provided in the embodiment of the present application further includes: and (3) crushing the biomass.
By adopting the scheme, after biomass is pulverized, the pulverized biomass is placed in the hydrothermal reaction kettle for reaction, so that the biomass can be fully reacted in the hydrothermal reaction kettle, and can be fully carbonized to obtain loose and porous biochar, and metal loading is facilitated during subsequent impregnation operation.
In an embodiment, after the biomass is pulverized, the preparation method of the denitration catalyst provided by the embodiment of the present application further includes: washing the biomass.
Wherein, the biomass is cleaned to remove the organic matters included in the biomass. In practical applications, the cleaning solution for cleaning the biomass may be, for example, deionized water containing ethanol.
It can be understood that, adopt above-mentioned scheme, wash kibbling living beings, get rid of wherein the organic matter that mingles after, place living beings in hydrothermal reaction kettle again and react, can avoid the organic matter to denitration catalyst catalytic activity's influence.
In order to further improve the catalytic activity of the prepared denitration catalyst, in an embodiment, after the biomass is placed in the hydrothermal reaction kettle for reaction in step 101, the preparation method of the denitration catalyst provided in the embodiment of the present application further includes: and putting a product obtained by the reaction in the hydrothermal reaction kettle into a metal salt solution for impregnation, and obtaining the first product after impregnation.
The method comprises the following steps of immersing a product obtained by reaction in a hydrothermal reaction kettle in a metal salt solution, specifically immersing biochar obtained by carbonizing biomass in the hydrothermal reaction kettle in the metal salt solution.
In this embodiment, the first product may be a product obtained by impregnating biochar in a metal salt solution. Then, step 102 mixes the first product with potassium carbonate, and specifically, the product obtained by immersing the biochar in the metal salt solution may be further mixed with a potassium carbonate solution, and a second immersing operation is performed.
The adding proportion of the biochar to the metal salt solution can be set according to actual conditions, for example, 0.5-3 g of biochar is placed in 1-2L of metal salt solution, and the concentration of the metal salt solution is 0.5-5 mol/L.
In order to sufficiently impregnate the biochar in the metal salt solution, the impregnation operation can be performed in a water bath ultrasonic device, and further, the impregnation temperature can be adjusted, for example, the water bath temperature is controlled to be 70 ℃. More specific impregnation procedures can also be carried out, for example, by carrying out the impregnation in a water bath ultrasonic device, ultrasonic impregnation in a water bath at 70 ℃ for 2h, followed by heating in a water bath at 85 ℃ for 1h, during which stirring is carried out continuously using a glass rod.
In an embodiment of the present application, the metal salt solution may include any one of a manganese sulfate solution, a copper nitrate solution, and a nickel acetate solution.
It can be understood that, by adopting the above scheme, the biochar obtained by carbonizing the biomass in the hydrothermal reaction kettle is placed in the metal salt solution for impregnation, and the biochar has more active sites after the metal salt solution impregnation, so that the redox capability can be improved, and NO is facilitatedXTo N2And further the catalytic activity of the denitration catalyst can be improved.
Based on the preparation method of the denitration catalyst provided by the embodiment of the application, the embodiment of the application also provides the denitration catalyst prepared by the preparation method, and the denitration catalyst can be used in an SCR denitration process, specifically, can be used in an SCR denitration reactor to directly replace the original catalyst in the SCR denitration reactor or be mixed with the original catalyst. The denitration catalyst provided by the embodiment of the application can also be used as an auxiliary means for continuously catalyzing the flue gas treated by the SCR denitration reactor so as to enable residual NO in the flue gasXContinuously reacting with ammonia gas to further remove NO in the flue gasXAnd the denitration effect of the SCR denitration system is improved.
Based on the denitration catalyst provided by the above embodiment of the present application, an embodiment of the present application further provides an application of the denitration catalyst, that is, an application method, including: the denitration catalyst is applied to a tail gas flue gas pipeline behind a denitration reactor.
The embodiment of the present application further provides an SCR denitration system 20, and as shown in fig. 2, the SCR denitration system 20 includes an SCR denitration reactor 201, an exhaust gas flue gas pipeline 202, a dust remover 203, a catalyst storage device 204, and a catalyst injection pipeline 205.
The outlet of the SCR denitration reactor 201 is communicated with the inlet of the dust remover 203 through the tail gas flue gas pipeline 202, and the flue gas treated by the SCR denitration reactor 201 is introduced into the dust remover 203 through the tail gas flue gas pipeline 202 so as to further remove dust in the flue gas.
The denitration catalyst provided in the above embodiments of the present application may be stored in the catalyst storage device 204. The inlet of the catalyst injection pipeline 205 is communicated with the outlet of the catalyst storage device 204, and the outlet of the catalyst injection pipeline 205 can extend into the exhaust gas flue gas pipeline 202, so that the denitration catalyst provided by the above embodiment of the application is injected into the exhaust gas flue gas pipeline 202. The catalyst injection pipe 205 or the catalyst storage device may be further provided with an associated power plant so that the catalyst injection pipe 205 can inject the denitration catalyst.
In order to make the denitration catalyst spray evenly, the flue gas fully contacts with the sprayed denitration catalyst, one end of the catalyst spray pipeline 205, which extends into the tail gas flue gas pipeline 202, can contact with the inner wall of the tail gas flue gas pipeline 202, and a plurality of spray holes M are evenly arranged on the part of the catalyst spray pipeline 205, which extends into the tail gas flue gas pipeline 202. Wherein, one end of the catalyst injection pipeline 205 extending into the exhaust gas flue gas pipeline 202 is in contact with the inner wall of the exhaust gas flue gas pipeline 202, which can be understood that the catalyst injection pipeline 205 penetrates through the exhaust gas flue gas pipeline 202.
To further bring the flue gas in the exhaust gas flue gas duct 202 into sufficient contact with the injected denitration catalyst, the SCR denitration system 20 may include a plurality of catalyst injection ducts 205, as shown in fig. 3 (fig. 3 is a cross-sectional view of the exhaust gas flue gas duct 202 along N-N' in fig. 2), the plurality of catalyst injection ducts 205 are all communicated with the catalyst storage device 204, and the plurality of catalyst injection ducts 205 are located in the same cross section of the exhaust gas flue gas duct 202 and are uniformly distributed in the cross section, and the flow direction of the flue gas is perpendicular to the cross section.
In the embodiment of the present application, the denitration catalyst is applied to the flue gas pipeline after the denitration reactor, specifically, the denitration catalyst may be applied to the exhaust gas flue gas pipeline 202 in the SCR denitration system 20 provided in the above embodiment of the present application; the denitration catalyst may be injected in the exhaust gas flue gas duct 202 through the catalyst injection duct 205.
It can be understood that when the load of the boiler unit is higher, more NO still exists in the flue gas treated by the SCR denitration reactor 201XAnd the denitration effect of the SCR denitration system is poor, and by adopting the above scheme, the denitration catalyst is applied to the tail gas flue gas pipeline after the denitration reactor, and the flue gas treated by the SCR denitration reactor 201 can be continuously catalyzed, so that residual NO in the flue gasXContinuously reacting with ammonia gas to further remove NO in the flue gasXThereby promoting the denitration effect of the SCR denitration system. Experiments prove that the denitration catalyst is applied to a tail gas flue gas pipeline behind the denitration reactor to remove NOXThe amount of (a) is equivalent to 10-15% of NO in the original flue gas to the SCR denitration reactor 201X。
On the other hand, the denitration catalyst that this application embodiment provided sprays at tail gas flue gas pipeline 202 before dust remover 203, can also make particulate matter collision in the flue gas condense, and then makes the flue gas get into behind the dust remover 203, can improve dust collection efficiency.
When the denitration catalyst is injected into the exhaust gas flue gas pipeline 202, in order to enable the flue gas to be in sufficient contact with the injected denitration catalyst and ensure the catalytic effect, in an embodiment, the application method of the denitration catalyst provided by the embodiment of the application further includes: the flue gas temperature in the tail gas flue gas pipeline is controlled to be 180-220 ℃, and the flue gas flow rate is less than or equal to 16 m/s.
In one embodiment, the SCR denitration system 20 further includes a flue gas conveying pipe 206 and a first branch pipe 207, as shown in fig. 4, an outlet of the flue gas conveying pipe 206 is communicated with an inlet of the SCR denitration reactor 201 for conveying the flue gas into the SCR denitration reactor 201; the inlet of the first branch 207 communicates with a first location a of the flue gas duct 206 and the outlet of the first branch 207 communicates with a second location B of the exhaust gas flue gas duct 202, said second location B being upstream of the catalyst injection duct 205.
In practical applications, the flue gas conveying pipe 206 and the first branch pipe 207 may be provided with valves. When the load of the boiler unit is small, NO in the flue gas sent to the SCR denitration reactor 201XWhen the content is low, the flue gas can be directly sent to the tail gas flue gas pipeline 202 through the first branch pipe 207 without passing through the SCR denitration reactor 201, and NO in the flue gas can be removed by using the denitration catalyst injected by the catalyst injection pipeline 205X。
It can be understood, adopt above-mentioned scheme, when boiler unit load is less, the flue gas can be walked around SCR denitration reactor 201 and directly access to tail gas flue gas pipeline 202, and the low price denitration catalyst based on catalyst injection pipeline 205 sprays carries out the denitration, can reduce the use number of times of expensive catalyst in SCR denitration reactor 201 from this, prolongs the life-span of catalyst, and then can reduce the change number of times of expensive catalyst in SCR denitration reactor 201 to can reduce SCR deNOx systems's running cost.
Based on the solutions provided by the above embodiments of the present application, the present application also provides specific examples to explain the solutions and technical effects provided by the present application. It is to be understood that the following examples are illustrative of specific embodiments only and are not to be construed as unduly limiting the scope of the present application.
Example 1
The preparation method of the denitration catalyst comprises the following steps:
the method comprises the following steps: crushing corn stalks;
step two: mixing the product with ethanol deionized water for washing, feeding the washed material into a closed hydrothermal carbonization reaction kettle, and reacting at 150 ℃ under 20MPa for 8 h;
step three: preparing a carbon-based composite catalyst (namely, a denitration catalyst) by adopting a wet impregnation method, mixing and stirring 1L of manganese sulfate solution with the concentration of 3mol/L and 3g of the product obtained in the step two for 1 hour, then impregnating in water bath ultrasonic equipment, ultrasonically impregnating in a water bath at 70 ℃ for 2 hours, heating in a water bath at 85 ℃ for 1 hour, and continuously stirring by using a glass rod in the process;
step four: with K2CO325 percent of loading capacity and 800 percent of calcining temperatureCatalyst preparation at c: adding 100ml of the product solution obtained in the third step into 100ml of K2CO3Deionized water, wherein 100ml of the product solution contains 0.6g of biochar and 100ml of K2CO3Deionized water containing 0.25gK2CO3；
Step five: stirring the mixed solution obtained in the step four for 3 hours by adopting a magnetic stirrer, and then placing the mixed solution in a drying oven for drying;
step six: and placing the dried catalyst primary product in a tubular furnace for calcination treatment at 800 ℃, wherein the calcination time is controlled to be 1-1.5 h, and the calcined product is the denitration catalyst.
A small simulation platform is built, the platform simulates the SCR denitration system 20, in the simulation platform, the tail gas flue gas pipeline 202 is a circular pipeline with the diameter of 0.3m, a denitration catalyst is sprayed into the pipeline, the temperature of flue gas in the pipeline is controlled to be 180 ℃, and the flow rate of the flue gas is controlled to be 2.6 m/s. After being detected and sprayed into the denitration catalyst, NO in the flue gasXThe concentration is 52mg/m3To 45mg/m3And the denitration efficiency is 13.46%.
Example 2
The preparation method of the denitration catalyst comprises the following steps:
the method comprises the following steps: crushing peanut shells;
step two: mixing the product with ethanol deionized water for washing, feeding the washed materials into a closed hydrothermal carbonization reaction kettle, and reacting at 100 ℃ and 15MPa for 6 hours;
step three: and (2) preparing the carbon-based composite catalyst (namely, the denitration catalyst) by adopting a wet impregnation method, mixing and stirring 1L of nickel acetate solution with the concentration of 2.5mol/L and 2g of the product obtained in the step two for 1h, then impregnating in water bath ultrasonic equipment, ultrasonically impregnating in a 70 ℃ water bath for 2h, heating in a 85 ℃ water bath for 1h, and continuously stirring by using a glass rod.
Step four: with K2CO3The catalyst is prepared with the loading of 25 percent and the calcining temperature of 800 ℃: adding 100ml of the product solution obtained in the third step into 100ml of K2CO3Deionized water containing 0.6% of 100ml of product solutiong biochar, 100ml of K2CO3Deionized water containing 0.25gK2CO3；
Step five: stirring the mixed solution obtained in the step four for 3 hours by adopting a magnetic stirrer, and then placing the mixed solution in a drying oven for drying;
step six: and placing the dried catalyst primary product in a tubular furnace for calcination treatment at 800 ℃, wherein the calcination time is controlled to be 1-1.5 h, and the calcined product is the denitration catalyst.
A small simulation platform is built, the platform simulates the SCR denitration system 20, in the simulation platform, the tail gas flue gas pipeline 202 is a circular pipeline with the diameter of 0.3m, a denitration catalyst is sprayed into the pipeline, the temperature of flue gas in the pipeline is controlled to be 200 ℃, and the flow rate of the flue gas is 3.5 m/s. After being detected and sprayed into the denitration catalyst, NO in the flue gasXThe concentration is from 55mg/m3To 49mg/m3And the denitration efficiency is 10.91%.
By way of example, the preparation method of the denitration catalyst provided by the above embodiment of the present application is adopted, and the method includes placing biomass in a hydrothermal reaction kettle to perform a reaction, so as to obtain a first product; mixing the first product with potassium carbonate to obtain a second product; calcining the second product to obtain the denitration catalyst; because the embodiment of the application can prepare the denitration catalyst based on the biomass with low price, the price of the denitration catalyst can be reduced, and the running cost of the SCR denitration system can be reduced.
The above description is only for the preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for preparing a denitration catalyst, the method comprising:
placing biomass in a hydrothermal reaction kettle for reaction to obtain a first product;
mixing the first product with potassium carbonate to obtain a second product;
and calcining the second product to obtain the denitration catalyst.
2. The method for preparing the denitration catalyst according to claim 1, wherein before the biomass is placed in the hydrothermal reaction kettle for reaction, the method further comprises:
and (3) crushing the biomass.
3. The method of producing the denitration catalyst according to claim 2, wherein after the pulverization treatment of the biomass, the method further comprises:
washing the biomass.
4. The method of preparing the denitration catalyst according to claim 1, wherein after the biomass is placed in a hydrothermal reaction kettle to react, the method further comprises:
and (3) putting a product obtained by the reaction in the hydrothermal reaction kettle into a metal salt solution for impregnation, and obtaining the first product after impregnation.
5. The method for preparing the denitration catalyst according to claim 1, wherein the biomass comprises any one or more of walnut shells, bagasse, corncobs, straws and peanut shells.
6. The preparation method of the denitration catalyst according to claim 1, wherein the reaction temperature of the biomass in the hydrothermal reaction kettle is 100 ℃ to 150 ℃, the reaction pressure is 3.0MPa to 25MPa, and the reaction time is 2h to 12 h.
7. The method of preparing a denitration catalyst according to claim 4, wherein the metal salt solution includes any one of a manganese sulfate solution, a copper nitrate solution, and a nickel acetate solution.
8. A denitration catalyst produced by the production method according to any one of claims 1 to 7.
9. Use of a denitration catalyst according to claim 8, wherein the denitration catalyst is used in an exhaust flue gas duct after a denitration reactor.
10. The application of claim 9, further comprising:
the flue gas temperature in the tail gas flue gas pipeline is controlled to be 180-220 ℃, and the flue gas flow rate is less than or equal to 16 m/s.
CN202210153648.7A 2022-02-18 2022-02-18 Denitration catalyst and preparation method and application thereof Pending CN114588891A (en)

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CN110508274A (en) * 2019-08-12 2019-11-29 四川大学 Modification biological charcoal low-temperature denitration catalyst and its application
WO2021223559A1 (en) * 2020-05-06 2021-11-11 江苏龙净科杰环保技术有限公司 Sulfur-resistant and water-resistant manganese-based low-temperature denitration catalyst and preparation method therefor

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* Cited by examiner, † Cited by third party
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JPH07299326A (en) * 1994-05-06 1995-11-14 Matsushita Seiko Co Ltd No2 removing agent
CN102698738A (en) * 2012-06-01 2012-10-03 重庆大学 SCR (Selective Catalytic Reduction) denitrification catalyst containing K2O and preparation method thereof
CN105170131A (en) * 2015-09-10 2015-12-23 广州中国科学院先进技术研究所 Preparation method of novel sludge carbon-based desulfurization and denitrification catalyst
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