CN106512687A - Powdered coal industrial boiler flue gas denitrifying system and denitrifying method - Google Patents

Powdered coal industrial boiler flue gas denitrifying system and denitrifying method Download PDF

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Publication number
CN106512687A
CN106512687A CN201611217255.9A CN201611217255A CN106512687A CN 106512687 A CN106512687 A CN 106512687A CN 201611217255 A CN201611217255 A CN 201611217255A CN 106512687 A CN106512687 A CN 106512687A
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China
Prior art keywords
flue gas
industrial boiler
fine coal
coal industrial
denitrifying
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CN201611217255.9A
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Chinese (zh)
Inventor
吴道洪
宋敏洁
王东方
田中君
杨玉地
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Beijing Shenwu Environmental and Energy Technology Co Ltd
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Beijing Shenwu Environmental and Energy Technology Co Ltd
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Priority to CN201611217255.9A priority Critical patent/CN106512687A/en
Publication of CN106512687A publication Critical patent/CN106512687A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D45/00Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/54Nitrogen compounds
    • B01D53/56Nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/75Multi-step processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8621Removing nitrogen compounds
    • B01D53/8625Nitrogen oxides
    • B01D53/8628Processes characterised by a specific catalyst
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/002Mixed oxides other than spinels, e.g. perovskite
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/84Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/85Chromium, molybdenum or tungsten
    • B01J23/888Tungsten
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/006Layout of treatment plant
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/027Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using cyclone separators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/04Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2523/00Constitutive chemical elements of heterogeneous catalysts

Abstract

The invention discloses a powdered coal industrial boiler flue gas denitrifying system and a denitrifying method. The denitrifying system comprises a powdered coal industrial boiler, a cyclone separation device, a denitrifying device, an air preheater, a desulfurizing device and a chimney, wherein a reducing agent nozzle is arranged on the side wall of a hearth of the powdered coal industrial boiler, and the reducing agent nozzle is suitable for spraying a reducing agent into the hearth, so that the reducing agent is mixed with the powdered coal industrial boiler flue gas in the hearth and the pre-denitrifying treatment is performed; the cyclone separation device is connected with a flue gas outlet of the powdered coal industrial boiler; a denitrifying catalyst is placed in the denitrifying device, and the denitrifying device is connected with a cyclone separator and is suitable for denitrifying the flue gas; the air preheater is connected with the denitrifying device and is suitable for preheating the oxygen-containing gas by use of the waste heat of the flue gas; the desulfurizing device is connected with the air preheater; and the chimney is connected with the desulfurizing device. By adopting the denitrifying system, the powdered coal industrial boiler flue gas can be effectively denitrified, and the denitrifying efficiency is remarkable.

Description

Fine coal Industrial Boiler flue gas denitrification system and method for denitration
Technical field
The invention belongs to denitrating flue gas field, specifically, the present invention relates to fine coal Industrial Boiler flue gas denitrification system and Method of denitration.
Background technology
As the fossil fuel equal energy sources such as developing rapidly for China's economy, natural gas, oil and coal obtain more extensive Using so that environmental problem is increasingly serious, therefore causes series of environmental problems, such as acid rain, depletion of the ozone layer, greenhouse effects Deng so that our living environment is further severe.Energy resource structure of the China based on coal determine China nitrogen oxides and Sulfur oxide emission is constantly in high situation, the discharge of a large amount of pollution gas so that environmental problem is increasingly tight It is high, the productive life of our people is not only had a strong impact on, and is unfavorable for the sustainable development of China's economy.Therefore, environment is asked Topic has obtained national increasing concern.
The NO of mankind's activity dischargeXMore than 90% from fuel combustion process.It is various industrial furnaces, Civil energy-saving cooking stove, motor-driven During high temp. combustion of fuel in car and other internal combustion engines, the nitrogen substance oxidation in fuel generates NOX, participate in burning air or N in oxygen-enriched air2And O2NO can also be generatedX.From the point of view of energy resource structure, in the primary energy of China and power generation energy resource composition, coal Occupy absolute leading position.And the coal of China more than 80% is directly burning, particularly for power station, Industrial Boiler And in civil boiler.Therefore, in considerably long period, the NO in flue gasXDischarge is to cause China air NOXOne master of pollution Factor is wanted, the NO of fixed source emission how is reducedXIt is an important topic of atmospheric environment improvement.
Denitrating flue gas belong to burning post-processing technology, and the smoke evacuation system of many developed countries all needs to install denitrating flue gas dress Put.Denitration method for flue gas is more, but obtains the only selective catalytic reduction of a large amount of commercial Applications at present and selective non-urge Change reducing process, additive method is in experimental study stage or pilot scale stage at present.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.For this purpose, the present invention One purpose is to propose fine coal Industrial Boiler flue gas denitrification system and method for denitration, using the denitrating system and method for denitration Using the denitration heat storage for having accumulation of heat and denitration function concurrently, surface is smooth, wear-resisting, and simple process is feasible, and flue gas without the need for dedusting is Denitration reaction can be carried out, simple to operate, denitration efficiency is high.
According to an aspect of the present invention, the present invention proposes fine coal Industrial Boiler flue gas denitrification system, including:
Fine coal Industrial Boiler, is provided with reductant nozzle, the reducing agent on the burner hearth sidewall of the fine coal Industrial Boiler Nozzle is suitable to spray into reducing agent into the burner hearth, the reducing agent is mixed in the burner hearth with fine coal Industrial Boiler flue gas And carry out pre- denitration process;
Cyclone separator, the cyclone separator are connected with the exhanst gas outlet of the fine coal Industrial Boiler, the rotation Wind separator is suitable to carry out dust removal process to flue gas;
There is in denitrification apparatus, the denitrification apparatus denitrating catalyst, the denitrification apparatus and the cyclone separator phase Even and be suitable to denitration process are carried out to flue gas;
Air preheater, the air preheater are connected with the denitrification apparatus, and the air preheater is suitable to using fume afterheat to oxygen-containing Gas is preheated;
Desulfurizer, the desulfurizer are connected with the air preheater, and the desulfurizer is suitable to remove the sulphur in flue gas Oxide;And
Chimney, the chimney are connected with the desulfurizer.
Thus, using the fine coal Industrial Boiler flue gas denitrification system of above-described embodiment, reductant nozzle is arranged on into burner hearth On the wall of side, and then flue gas is mixed with reducing agent in burner hearth carry out pre- denitration process, the flue gas Jing after pre- denitration process Crossing dust removal process and carrying out reduction reaction in denitrification apparatus again carries out denitration process, and last Mist heat recovering simultaneously carries out desulfurization Process.The system carries out pre- denitration process to flue gas, such that it is able to the nitrogen oxidation in partial removal flue gas using high temperature in burner hearth Thing, mitigates the pressure of follow-up out of stock device, reduces the consumption of out of stock catalyst, reduce out-of-stock cost.
In addition, fine coal Industrial Boiler flue gas denitrification system according to the above embodiment of the present invention can also have following adding Technical characteristic:
In some embodiments of the invention, the denitration heat storage is spherical, strip, cylindrical shape or honeycomb ceramics shape.
In some embodiments of the invention, the denitrating catalyst is cellular and profile in square, the pros Body size be 200mm × 200mm × 200mm, on the denitrating catalyst section of through hole for square, size be 15mm × 15mm。
In some embodiments of the invention, the reductant nozzle is atomizer.
In some embodiments of the invention, the atomizer is ammonia atomization nozzle or urea atomizer.
In some embodiments of the invention, the air preheater is connected with the combustion adjuvant entrance of the fine coal Industrial Boiler, To be suitable to be passed through the oxygen-containing gas after preheating as combustion adjuvant in fine coal Industrial Boiler.
According to the second aspect of the invention, the invention allows for using the fine coal Industrial Boiler cigarette described in preceding embodiment The method that gas denitrating system processes fine coal Industrial Boiler flue gas, including:
Reducing agent is sprayed into by reductant nozzle into the burner hearth of fine coal Industrial Boiler, the reducing agent is made with fine coal industry Boiler smoke mixes in the burner hearth and carries out pre- denitration process;
The mixed flue gas discharged are made from fine coal Industrial Boiler to enter cyclone separator, to remove to mixed flue gas Dirt process;
The mixed flue gas through the dust removal process are made to enter denitrification apparatus, to make to mix in the presence of denitrating catalyst Close flue gas and reduction reaction removing nitrogen oxides occurs;
The flue gas of removing nitrogen oxides is made to enter air preheater, to preheat oxygen-containing gas using fume afterheat;
The flue gas after dust removal process is made to carry out desulfurization process into desulfurizer, to be purified rear flue gas;
Flue gas after the purification is discharged by chimney.
Thus, using the fine coal Industrial Boiler denitration method for flue gas of above-described embodiment, reductant nozzle is arranged on into burner hearth On the wall of side, and then flue gas is mixed with reducing agent in burner hearth carry out pre- denitration process, the flue gas Jing after pre- denitration process Crossing dust removal process and carrying out reduction reaction in denitrification apparatus again carries out denitration process, and last Mist heat recovering simultaneously carries out desulfurization Process.The system carries out pre- denitration process to flue gas, such that it is able to the nitrogen oxidation in partial removal flue gas using high temperature in burner hearth Thing, mitigates the pressure of follow-up out of stock device, reduces the consumption of out of stock catalyst, reduce out-of-stock cost.
In addition, fine coal Industrial Boiler denitration method for flue gas according to the above embodiment of the present invention can also have following adding Technical characteristic:
In some embodiments of the invention, the method for denitration of above-described embodiment further includes, will be pre- using air preheater The hot oxygen-containing gas that heat is obtained is used for fine coal Industrial Boiler as combustion adjuvant, and the temperature of the hot oxygen-containing gas is taken the photograph for 150-300 Family name's degree.
In some embodiments of the invention, the temperature that the mixed flue gas occur reduction reaction is 300-600 degree Celsius.
In some embodiments of the invention, the denitrating catalyst is with TiO2-Al2O3Composite oxides are carrier, with work Property charcoal be main active, with V2O5-WO3Composite oxides are Supplementary active ingredients, with transition metal iron, rare-earth elements of lanthanum As auxiliary agent, using enamel as additive;
Wherein, based on the denitrating catalyst oeverall quality, the TiO2-Al2O3Composite oxide supported amount is 10~60 Quality %, the load capacity of the activated carbon is 10~50 mass %, the V2O5-WO3The load capacity of composite oxides is 5~20 Quality %, the transition metal iron load capacity is 0.1~10 mass %, the rare-earth elements of lanthanum load capacity is 0.1~10 matter Amount %, the load capacity of the enamel is 1~10 mass %.
In some embodiments of the invention, the denitrating catalyst is prepared through the following steps:
(1) titanium source reagent and silicon source reagent are configured to into the titanium source aqueous solution and silicon source solution respectively, and by the titanium source water Solution and source of aluminium solution are co-precipitated, to prepare the precipitation mixture of titanium hydroxide and aluminium hydroxide;
(2) precipitation mixture is carried out into the first drying and the first roasting, to obtain TiO2-Al2O3Composite oxides Support powder;
(3) by the TiO2-Al2O3Composite oxide carrier powder is carried out with active carbon powder, enamel powder and binding agent Extrusion molding, sizing and drying, to obtain activated carbon/TiO2-Al2O3Composite catalyst;
(4) ammonium metatungstate, ammonium metavanadate are dissolved in oxalic acid, to obtain the first maceration extract;
(5) by the activated carbon/TiO2-Al2O3Composite catalyst carries out the first dipping in first maceration extract, complete The second drying and the second roasting are carried out into after the dipping, to obtain V2O5-WO3/ activated carbon/TiO2-Al2O3Composite catalyzing Agent;
(6) iron chloride, lanthanum chloride are configured to into mixed aqueous solution, to obtain the second maceration extract;And
(7) by the V2O5-WO3/ activated carbon/TiO2-Al2O3Composite catalyst carries out second in second maceration extract Dipping, carries out the 3rd drying and the 3rd roasting after completing second dipping, to obtain denitrating catalyst.
Description of the drawings
Fig. 1 is the structural representation of fine coal Industrial Boiler flue gas denitrification system according to an embodiment of the invention.
Fig. 2 is the flow chart of fine coal Industrial Boiler denitration method for flue gas according to an embodiment of the invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
According to an aspect of the present invention, the present invention proposes fine coal Industrial Boiler flue gas denitrification system, below with reference to Fig. 1 The fine coal Industrial Boiler flue gas denitrification system of the description embodiment of the present invention, including:Fine coal Industrial Boiler 100, cyclone separator 200th, denitrification apparatus 300, air preheater 400, desulfurizer 500 and chimney 600.
Wherein, reductant nozzle 110 is provided with the burner hearth sidewall of fine coal Industrial Boiler 100, reductant nozzle 110 is suitable to Reducing agent is sprayed into into burner hearth 120, reducing agent is mixed in burner hearth with fine coal Industrial Boiler flue gas and is carried out pre- denitration process; Cyclone separator 200 is connected with the exhanst gas outlet 120 of fine coal Industrial Boiler 100, and cyclone separator 200 is suitable to enter flue gas Row dust removal process;There is in denitrification apparatus 300 denitrating catalyst, denitrification apparatus 300 are connected and are suitable to cyclone separator 200 Denitration process are carried out to flue gas;Air preheater 400 is connected with denitrification apparatus 300, and air preheater 400 is suitable to using fume afterheat to oxygen-containing Gas is preheated;Desulfurizer 500 is connected with air preheater 400, and desulfurizer 500 is suitable to remove the oxysulfide in flue gas; And chimney 600 is connected with desulfurizer 500.
Thus, using the fine coal Industrial Boiler flue gas denitrification system of above-described embodiment, reductant nozzle is arranged on into burner hearth On the wall of side, and then flue gas is mixed with reducing agent in burner hearth carry out pre- denitration process, the flue gas Jing after pre- denitration process Crossing dust removal process and carrying out reduction reaction in denitrification apparatus again carries out denitration process, and last Mist heat recovering simultaneously carries out desulfurization Process.The system carries out pre- denitration process to flue gas, such that it is able to the nitrogen oxidation in partial removal flue gas using high temperature in burner hearth Thing, mitigates the pressure of follow-up out of stock device, reduces the consumption of out of stock catalyst, reduce out-of-stock cost.
The fine coal Industrial Boiler flue gas denitrification system of the specific embodiment of the invention is described below in detail.
Fine coal Industrial Boiler 100
Embodiments in accordance with the present invention, are provided with reductant nozzle 110 on the burner hearth sidewall of fine coal Industrial Boiler 100, also Former agent nozzle 110 is suitable to spray into reducing agent into burner hearth 120, reducing agent is mixed simultaneously in burner hearth with fine coal Industrial Boiler flue gas Carry out pre- denitration process.Thus, reducing agent is sprayed into by reductant nozzle into the burner hearth of fine coal Industrial Boiler, make reducing agent with Fine coal Industrial Boiler flue gas mixes in burner hearth and carries out pre- denitration process.
Embodiments in accordance with the present invention, reductant nozzle are arranged on burner hearth, and reducing agent can Quick-gasifying or decomposition after spraying Into gaseous ammonia, and mix with high-temperature flue gas rapidly, and the nitrogen oxides and reducing agent in the presence of high temperature in burner hearth, in flue gas Generation reduction reaction, by the part removal of nitrogen oxide in flue gas, can mitigate the out of stock pressure of follow-up out of stock device, reduce out of stock The consumption of catalyst, reduces operating cost.
According to a particular embodiment of the invention, reductant nozzle is atomizer.Thus effervescent atomization technology is adopted, is used High pressure air or oxygen-enriched air make the moment atomization that reducing agent sprays be little droplet as atomizing medium, and droplet particle can Less than 40 μm are reached, can be good at being well mixed with flue gas.
According to a particular embodiment of the invention, atomizer can be ammonia atomization nozzle or urea atomizer.By This sprays into ammoniacal liquor or urea into burner hearth 120 as reducing agent.Reducing agent is made to mix in burner hearth with fine coal Industrial Boiler flue gas And pre- denitration process are carried out, so as to improve overall denitration efficiency.
Cyclone separator 200
Embodiments in accordance with the present invention, cyclone separator 200 are connected with the exhanst gas outlet 120 of fine coal Industrial Boiler 100, Cyclone separator 200 is suitable to carry out dust removal process to flue gas.Thus, enter from fine coal Industrial Boiler the mixed flue gas discharged Enter cyclone separator, dust removal process to be carried out to mixed flue gas.
Embodiments in accordance with the present invention, it can be anthracite, jet coal, bituminous coal, brown coal that fine coal Industrial Boiler is raw materials used Deng one or more, Task-size Controlling is between 50~500 μm.Therefore, can be adjoint while pulverized coal friring produces high-temperature flue gas There is substantial amounts of dust to produce, and as flue gas is discharged.By being carried out at dedusting to flue gas using cyclone separator 200 in advance Reason, can further improve the denitration process efficiency of follow-up denitrification apparatus.
Denitrification apparatus 300
Embodiments in accordance with the present invention, have denitrating catalyst, denitrification apparatus 300 and cyclonic separation in denitrification apparatus 300 Device 200 is connected and be suitable to carries out denitration process to flue gas.Thus, the mixed flue gas through dust removal process are made to fill into denitration Put, reduction reaction removing nitrogen oxides occurs so that mixed flue gas are made in the presence of denitrating catalyst.
Embodiments in accordance with the present invention, denitration heat storage are spherical, strip, cylindrical shape or honeycomb ceramics shape.
Embodiments in accordance with the present invention, it is in square that denitrating catalyst is cellular and profile, and square size is 200mm × 200mm × 200mm, on denitrating catalyst, the section of through hole is square, and size is 15mm × 15mm.Reality of the invention Example is applied, the section of through hole can also be circle on denitrating catalyst, and aperture is 15mm.
Embodiments in accordance with the present invention, denitrating catalyst is with TiO2-Al2O3Composite oxides are carrier, based on activated carbon Active component is wanted, with V2O5-WO3Composite oxides are Supplementary active ingredients, using transition metal iron, rare-earth elements of lanthanum as auxiliary agent, Using enamel as additive;
Wherein, based on denitrating catalyst oeverall quality, TiO2-Al2O3Composite oxide supported amount is 10~60 mass %, The load capacity of activated carbon be 10~50 mass %, V2O5-WO3The load capacity of composite oxides be 5~20 mass %, transition metal Iron load capacity is 0.1~10 mass %, rare-earth elements of lanthanum load capacity is 0.1~10 mass %, and the load capacity of enamel is 1~10 matter Amount %.
According to a particular embodiment of the invention, the high-temperature flue gas that burning is produced and the reductant nozzle spray being arranged on burner hearth The reducing agent hybrid concurrency for going out is survived after former reactive moieties removing nitrogen oxides, from pulverized coal boiler burner hearth out, Jing convection banks Afterwards, Jing after cyclone separator rough dusting into denitrification apparatus after flue-gas temperature is reduced to 300-600 DEG C.In denitrification apparatus In the presence of denitrating catalyst, there is reduction reaction with ammonia in the nitrogen oxides in flue gas, remove nitrogen oxides, removing effect Rate is up to more than 98%.The abundant recovery waste heat of flue gas Jing air preheaters after denitration, subsequently into flue gas desulphurization system, removes flue gas In sulfide after, externally discharged by chimney.According to a particular embodiment of the invention, there is reduction in flue gas in denitrification apparatus The temperature of reaction is 300-600 degree Celsius.It is possible thereby to further improve catalytic denitration reaction, removal of nitrogen oxide rate is improved.
Air preheater 400
Embodiments in accordance with the present invention, air preheater 400 are connected with denitrification apparatus 300, and air preheater 400 is suitable to using more than flue gas Heat is preheated to oxygen-containing gas.Thus, the flue gas of removing nitrogen oxides is made to enter air preheater, to preheat using fume afterheat Oxygen-containing gas.
Embodiments in accordance with the present invention, air preheater are connected with the combustion adjuvant entrance of fine coal Industrial Boiler, so that be suitable to will be pre- Oxygen-containing gas after heat is passed through in fine coal Industrial Boiler as combustion adjuvant.It is possible thereby to the heat obtained using air preheater preheating is contained Carrier of oxygen is used for fine coal Industrial Boiler as combustion adjuvant, and the temperature of hot oxygen-containing gas is 150-300 degree Celsius.
Desulfurizer 500 and chimney 600
Embodiments in accordance with the present invention, desulfurizer 500 are connected with air preheater 400, and desulfurizer 500 is suitable to remove flue gas In oxysulfide;And chimney 600 is connected with desulfurizer 500.Thus, the flue gas after dust removal process is made to enter desulfurization Device carries out desulfurization process, and to be purified rear flue gas, after purifying, flue gas is discharged by chimney.
According to the second aspect of the invention, the present invention proposes fine coal Industrial Boiler denitration method for flue gas, and the method is utilized The fine coal Industrial Boiler flue gas denitrification system of preceding embodiment is carried out.
Included according to the fine coal Industrial Boiler denitration method for flue gas of the specific embodiment of the invention:By reductant nozzle to powder Reducing agent is sprayed in the burner hearth of coal Industrial Boiler, reducing agent is mixed in burner hearth with fine coal Industrial Boiler flue gas and is carried out pre- de- Nitre process;The mixed flue gas discharged are made from fine coal Industrial Boiler to enter cyclone separator, to remove to mixed flue gas Dirt process;The mixed flue gas through dust removal process are made to enter denitrification apparatus, so that mixing cigarette is made in the presence of denitrating catalyst There is reduction reaction removing nitrogen oxides in gas;The flue gas of removing nitrogen oxides is made to enter air preheater, so as to pre- using fume afterheat Hot oxygen-containing gas;The flue gas after dust removal process is made to carry out desulfurization process into desulfurizer, to be purified rear flue gas; After purifying, flue gas is discharged by chimney.
Thus, using the fine coal Industrial Boiler denitration method for flue gas of above-described embodiment, reductant nozzle is arranged on into burner hearth On the wall of side, and then flue gas is mixed with reducing agent in burner hearth carry out pre- denitration process, the flue gas Jing after pre- denitration process Crossing dust removal process and carrying out reduction reaction in denitrification apparatus again carries out denitration process, and last Mist heat recovering simultaneously carries out desulfurization Process.The system carries out pre- denitration process to flue gas, such that it is able to the nitrogen oxidation in partial removal flue gas using high temperature in burner hearth Thing, mitigates the pressure of follow-up out of stock device, reduces the consumption of out of stock catalyst, reduce out-of-stock cost.
The fine coal Industrial Boiler denitration method for flue gas of the specific embodiment of the invention is described in detail below with reference to Fig. 2.
S100:Pre- denitration process in burner hearth
Embodiments in accordance with the present invention, into the burner hearth of fine coal Industrial Boiler spray into reducing agent by reductant nozzle, make Reducing agent is mixed in burner hearth with fine coal Industrial Boiler flue gas and carries out pre- denitration process.
Embodiments in accordance with the present invention, reductant nozzle are arranged on burner hearth, and reducing agent can Quick-gasifying or decomposition after spraying Into gaseous ammonia, and mix with high-temperature flue gas rapidly, and the nitrogen oxides and reducing agent in the presence of high temperature in burner hearth, in flue gas Generation reduction reaction, by the part removal of nitrogen oxide in flue gas, can mitigate the out of stock pressure of follow-up out of stock device, reduce out of stock The consumption of catalyst, reduces operating cost.
According to a particular embodiment of the invention, reductant nozzle is atomizer.Thus effervescent atomization technology is adopted, is used High pressure air or oxygen-enriched air make the moment atomization that reducing agent sprays be little droplet as atomizing medium, and droplet particle can Less than 40 μm are reached, can be good at being well mixed with flue gas.
According to a particular embodiment of the invention, atomizer can be ammonia atomization nozzle or urea atomizer.By This sprays into ammoniacal liquor or urea into burner hearth 120 as reducing agent.Reducing agent is made to mix in burner hearth with fine coal Industrial Boiler flue gas And pre- denitration process are carried out, so as to improve overall denitration efficiency.
S200:Dust removal process
Embodiments in accordance with the present invention, make from fine coal Industrial Boiler the mixed flue gas discharged enter cyclone separator, To carry out dust removal process to mixed flue gas.
Embodiments in accordance with the present invention, it can be anthracite, jet coal, bituminous coal, brown coal that fine coal Industrial Boiler is raw materials used Deng one or more, Task-size Controlling is between 50~500 μm.Therefore, can be adjoint while pulverized coal friring produces high-temperature flue gas There is substantial amounts of dust to produce, and as flue gas is discharged.By dust removal process being carried out to flue gas using cyclone separator in advance, can Further to improve the denitration process efficiency of follow-up denitrification apparatus.
S300:Reduction reaction removes nitrogen oxides
Embodiments in accordance with the present invention, make the mixed flue gas through dust removal process enter denitrification apparatus, to urge in denitration Make mixed flue gas that reduction reaction removing nitrogen oxides occurs in the presence of agent.
Embodiments in accordance with the present invention, denitration heat storage are spherical, strip, cylindrical shape or honeycomb ceramics shape.
Embodiments in accordance with the present invention, denitrating catalyst is cellular and profile in square, and square size is 200mm × 200mm × 200mm, on denitrating catalyst, the section of through hole is square, and size is 15mm × 15mm.According to this Bright embodiment, on denitrating catalyst, the section of through hole can also be circle, and aperture is 15mm.
Embodiments in accordance with the present invention, denitrating catalyst is with TiO2-Al2O3Composite oxides are carrier, based on activated carbon Active component is wanted, with V2O5-WO3Composite oxides are Supplementary active ingredients, using transition metal iron, rare-earth elements of lanthanum as auxiliary agent, Using enamel as additive;
Wherein, based on denitrating catalyst oeverall quality, TiO2-Al2O3Composite oxide supported amount is 10~60 mass %, The load capacity of activated carbon be 10~50 mass %, V2O5-WO3The load capacity of composite oxides be 5~20 mass %, transition metal Iron load capacity is 0.1~10 mass %, rare-earth elements of lanthanum load capacity is 0.1~10 mass %, and the load capacity of enamel is 1~10 matter Amount %.
According to a particular embodiment of the invention, the high-temperature flue gas that burning is produced and the reductant nozzle spray being arranged on burner hearth The reducing agent hybrid concurrency for going out is survived after former reactive moieties removing nitrogen oxides, from pulverized coal boiler burner hearth out, Jing convection banks Afterwards, Jing after cyclone separator rough dusting into denitrification apparatus after flue-gas temperature is reduced to 300-600 DEG C.In denitrification apparatus In the presence of denitrating catalyst, there is reduction reaction with ammonia in the nitrogen oxides in flue gas, remove nitrogen oxides, removing effect Rate is up to more than 98%.The abundant recovery waste heat of flue gas Jing air preheaters after denitration, subsequently into flue gas desulphurization system, removes flue gas In sulfide after, externally discharged by chimney.According to a particular embodiment of the invention, there is reduction in flue gas in denitrification apparatus The temperature of reaction is 300-600 degree Celsius.It is possible thereby to further improve catalytic denitration reaction, removal of nitrogen oxide rate is improved.
Embodiments in accordance with the present invention, denitrating catalyst are prepared through the following steps:
(1) titanium source reagent and silicon source reagent are configured to into the titanium source aqueous solution and silicon source solution respectively, and by the titanium source aqueous solution It is co-precipitated with silicon source solution, to prepare the precipitation mixture of titanium hydroxide and aluminium hydroxide;
(2) precipitation mixture is carried out into the first drying and the first roasting, to obtain TiO2-Al2O3Composite oxide carrier Powder;
(3) by TiO2-Al2O3Composite oxide carrier powder is extruded with active carbon powder, enamel powder and binding agent It is molded, shapes and is dried, to obtain activated carbon/TiO2-Al2O3Composite catalyst;
(4) ammonium metatungstate, ammonium metavanadate are dissolved in oxalic acid, to obtain the first maceration extract;
(5) by activated carbon/TiO2-Al2O3Composite catalyst carries out the first dipping in the first maceration extract, after completing dipping The second drying and the second roasting are carried out, to obtain V2O5-WO3/ activated carbon/TiO2-Al2O3Composite catalyst;
(6) iron chloride, lanthanum chloride are configured to into mixed aqueous solution, to obtain the second maceration extract;And
(7) by V2O5-WO3/ activated carbon/TiO2-Al2O3Composite catalyst carries out the second dipping in the second maceration extract, complete The 3rd drying and the 3rd roasting are carried out into after the second dipping, to obtain denitrating catalyst.
Embodiments in accordance with the present invention, the preparation method of denitrating catalyst are specifically included:
(1) preparation of carrier
A certain amount of titanium source reagent of sulfuric acid oxygen titanium and silicon source reagent aluminium chloride are taken, appropriate deionized water is dissolved separately in In, stirring, titanium source and silicon source solution is obtained respectively, the ratio of both concentration is 1:(0.01~2).By titanium source solution, silicon source Solution, ammoniacal liquor by way of cocurrent are instilled in the reactor equipped with a small amount of deionized water by certain flow rate, are set in the reactor There is agitating device, it is ensured that solution is well mixed, reacts abundant.Titanium source solution is identical with silicon source solution instillation speed, controls ammoniacal liquor Instillation speed, by the control of the pH value of reactant liquor between 9~11, co-precipitation is obtained titanium hydroxide and is mixed with the precipitation of aluminium hydroxide Compound.By the sediment suction filtration, washing, it is repeated several times, until pH value is to 7 or so.Then dry 8 under the conditions of 85~115 DEG C After~15h, under the conditions of 350~600 DEG C, 5~8h of roasting, obtains TiO2-Al2O3Composite oxide carrier.
(2) active component load
Active component active carbon powder, enamel powder are well mixed with the support powder that above-mentioned steps are obtained, addition adds Plus after agent enamel, binding agent glycerine stir, suppressed or extrusion molding, can be spherical, strip or honeycomb ceramics shape etc.. Then this part carried out shaping under the conditions of 95~115 DEG C, be dried, obtain activated carbon/TiO2-Al2O3Composite catalyst.
Then a certain amount of ammonium metatungstate, ammonium metavanadate reagent are dissolved in appropriate oxalic acid, previous step is obtained Activated carbon/TiO2-Al2O3Composite catalyst is dipped in isopyknic solution, and wherein in the solution, the mol ratio of vanadium tungsten is 1: (0.1~5).Dipping temperature is normal temperature, 5~8h of dip time, is dried 8~15h after the completion of dipping under the conditions of 85~115 DEG C Afterwards, 5~8h of roasting under the conditions of 350~600 DEG C.
(3) auxiliary agent load
By a certain amount of iron chloride (FeCl3·6H2O), lanthanum chloride (LaCl3·7H2O) it is dissolved in appropriate deionized water In, and catalyst precursor obtained above being dipped in isopyknic solution, dipping temperature is normal temperature, dip time 5~ 8h, after being dried 8~15h under the conditions of 85~115 DEG C after the completion of dipping, under the conditions of 350~600 DEG C, 5~8h of roasting, is made pottery Denitrating catalyst finished product of the porcelain for additive.
If the profile of denitrating catalyst can be with catalyst as spherical, catalyst diameter can be 3~6mm;If catalyst is Strip, catalyst are cylindrical shape, and diameter can be 3~6mm, and length can be 10~60mm;If catalyst is cellular, Cross section can be cuboid, square, or circle, sector, ellipse etc., size typically can for 150mm × 150mm × 150mm, 250mm × 200mm × 150mm etc., on denitrating catalyst, the section of through hole is square, and size is 10mm × 10mm or 15mm × 15mm, on denitrating catalyst, the section of through hole can also be circle, and radius is 10mm or 15mm.Outward Shape, size, aperture can be determined after being considered according to composite factors such as concrete operating mode, use environments.Honeycomb ceramics shape is preferred, and this is Because the catalyst that the specific surface area of honeycombed catalyst compares other shapes is big, the contact surface of catalyst and reaction medium is more Greatly, catalytic reaction is in hgher efficiency.When catalyst is honeycomb ceramics shape, the specific surface area of denitrating catalyst is in 320m2/m3More than, machine Tool intensity > 2MPa, the catalysis activity of nitrogen oxides reduction may be up to more than 98%.
In the denitration scheme of the present invention, contain a large amount of dust, Jing whirlwind from fine coal Industrial Boiler high-temperature flue gas out After dust arrester removes most of dust, denitration reaction is carried out into denitrating system.The present invention adopts Faveolate denitration catalyst, Be arranged in the denitration space of square, denitrating catalyst adopt square form, size from 200mm × 200mm × 200mm, on denitrating catalyst, the section of through hole is square, and size is 15mm × 15mm.Due to from fine coal Industrial Boiler out High-temperature flue gas in contain a large amount of dust, although eliminate most of dust through cyclone dust collector, but also contain in flue gas A certain amount of dust, therefore, the aperture that the denitration accumulation of heat honeycomb ceramics selected herein is used can not be too little.But the present invention is used The accumulation of heat denitration honeycomb ceramics of enamel is added with, its surface is smooth, wear-resisting, with good anti-clogging, from above-mentioned size Accumulation of heat denitration honeycomb ceramics can just reach good denitration effect.
S400:Fume afterheat is utilized
Embodiments in accordance with the present invention, make the flue gas of removing nitrogen oxides enter air preheater, so as to pre- using fume afterheat Hot oxygen-containing gas.
Embodiments in accordance with the present invention, above-mentioned method of denitration further include, the heat obtained using air preheater preheating are contained Carrier of oxygen is used for fine coal Industrial Boiler as combustion adjuvant, and the temperature of hot oxygen-containing gas is 150-300 degree Celsius.Thus make full use of The high-temperature flue gas waste heat that burning is produced, energy-efficient, energy utilization rate is high.
S500:Desulfurization process
Embodiments in accordance with the present invention, make the flue gas after dust removal process carry out desulfurization process into desulfurizer, with Just it is purified rear flue gas;After purifying, flue gas is discharged by chimney.
Embodiments in accordance with the present invention, the fine coal Industrial Boiler flue gas denitrification system of the above embodiment of the present invention and denitration side Method at least has one of following advantages:
(1) using the denitrating catalyst containing enamel, catalyst surface is smooth, wear-resisting, and denitrating technique is simple and feasible, operation letter Single, denitration efficiency is high.
(2) flue gas that burning is produced temperature Jing after convection bank is reduced to 300-600 DEG C, carries out denitration into denitrating system After process, then abundant recovery waste heat is externally discharged by chimney Jing after desulfurization, reduces exhaust gas temperature, is reduced smoke evacuation and is damaged Lose, reduce nitrogen oxide emission, it is energy-efficient, environmentally friendly.
(3) air/oxygen-enriched air is heated to after 150~300 DEG C by air preheater and participates in burning, makes full use of burning to produce Raw high-temperature flue gas waste heat, energy-efficient, energy utilization rate is high.
(4) reductant nozzle is arranged on into burner hearth, high temperature of the reducing agent under the high temperature action in burner hearth, with burning generation There is reduction reaction in the nitrogen oxides in flue gas, can mitigate follow-up out of stock device with the nitrogen oxides in partial removal flue gas Pressure, reduces the consumption of out of stock catalyst, reduces out-of-stock cost.
Embodiment
The jet coal for being crushed to less than 100 μm is sprayed in boiler furnace by nozzle, burner hearth is sent into by air blast Burnt after interior air mixing, in burner hearth, temperature is up to more than 1050 DEG C.It is arranged at the atomization reductant nozzle spray of burner hearth Go out urea droplet, in the presence of high temperature in burner hearth, urea fast decoupled goes out ammonia, the nitrogen in the high-temperature flue gas that ammonia is produced with burning There is reduction reaction, the configured convection tube in burner hearth smoke outlet of high-temperature flue gas of partial removal nitrogen oxides in oxide Beam, heats softened water therein.
Temperature is reduced to 500 DEG C of flue gas and denitrating system is entered Jing after cyclone dust collector rough dusting.In out of stock catalysis In the presence of agent, there is reduction reaction with ammonia in the nitrogen oxides in flue gas, further remove nitrogen oxides, and removal efficiency is reachable 98%.The abundant recovery waste heat of flue gas Jing air preheaters after denitration, subsequently into flue gas desulphurization system, removes the sulfide in flue gas Afterwards, externally discharged by chimney.
The air that burner hearth is sent into above by air blast is preheated to feeding burner hearth after 250 DEG C through air preheater and is mixed with fine coal Burnt after conjunction, efficiency of combustion can be effectively improved, saved raw material dosage, cut operating costs.
The concrete proportioning of the denitrating catalyst is as follows:On the basis of catalyst total quality, wherein TiO2-Al2O3Composite oxygen The mass loading amount of compound carrier is 48%, and the mass loading amount of activated carbon is 27%, V2O5-WO3Composite oxides active component Mass loading amount be 15%, auxiliary agent iron, the mass loading amount of lanthanum auxiliary agent are respectively 1%, 4%, and the quality of additive enamel is born Carrying capacity is 5%.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show Example ", or the description of " some examples " etc. mean specific features with reference to the embodiment or example description, structure, material or spy Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be arbitrary Combined in individual or multiple embodiments or example in an appropriate manner.Additionally, in the case of not conflicting, the technology of this area The feature of the different embodiments or example described in this specification and different embodiments or example can be combined by personnel And combination.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned Embodiment is changed, changes, replacing and modification.

Claims (10)

1. a kind of fine coal Industrial Boiler flue gas denitrification system, it is characterised in that include:
Fine coal Industrial Boiler, is provided with reductant nozzle, the reductant nozzle on the burner hearth sidewall of the fine coal Industrial Boiler Be suitable to reducing agent be sprayed into into the burner hearth, the reducing agent is mixed in the burner hearth with fine coal Industrial Boiler flue gas and go forward side by side The pre- denitration process of row;
Cyclone separator, the cyclone separator are connected with the exhanst gas outlet of the fine coal Industrial Boiler, the whirlwind point It is suitable to carry out dust removal process to flue gas from device;
Denitrification apparatus, have denitrating catalyst in the denitrification apparatus, the denitrification apparatus be connected with the cyclone separator and It is be suitable to that denitration process are carried out to flue gas;
Air preheater, the air preheater are connected with the denitrification apparatus, and the air preheater is suitable to using fume afterheat to oxygen-containing gas Preheated;
Desulfurizer, the desulfurizer are connected with the air preheater, and the desulfurizer is suitable to remove the sulphur oxidation in flue gas Thing;And
Chimney, the chimney are connected with the desulfurizer.
2. fine coal Industrial Boiler flue gas denitrification system according to claim 1, it is characterised in that the denitration heat storage is Spherical, strip, cylindrical shape or honeycomb ceramics shape.
3. fine coal Industrial Boiler flue gas denitrification system according to claim 2, it is characterised in that the denitrating catalyst is Cellular and profile be in square, the square size be 200mm × 200mm × 200mm, through hole on the denitrating catalyst Section for square, size be 15mm × 15mm.
4. fine coal Industrial Boiler flue gas denitrification system according to claim 1, it is characterised in that the reductant nozzle is Atomizer,
Optionally, the atomizer is ammonia atomization nozzle or urea atomizer.
5. fine coal Industrial Boiler flue gas denitrification system according to claim 1, it is characterised in that the air preheater with it is described The combustion adjuvant entrance of fine coal Industrial Boiler is connected, to be suitable to be passed through fine coal industry using the oxygen-containing gas after preheating as combustion adjuvant In boiler.
6. the method that the fine coal Industrial Boiler flue gas denitrification system described in a kind of any one of utilization claim 1-5 processes flue gas, Including:
Reducing agent is sprayed into by reductant nozzle into the burner hearth of fine coal Industrial Boiler, the reducing agent and fine coal Industrial Boiler is made Flue gas mixes in the burner hearth and carries out pre- denitration process;
The mixed flue gas discharged are made from fine coal Industrial Boiler to enter cyclone separator, to carry out at dedusting to mixed flue gas Reason;
The mixed flue gas through the dust removal process are made to enter denitrification apparatus, so that mixing cigarette is made in the presence of denitrating catalyst There is reduction reaction removing nitrogen oxides in gas;
The flue gas of removing nitrogen oxides is made to enter air preheater, to preheat oxygen-containing gas using fume afterheat;
The flue gas after dust removal process is made to carry out desulfurization process into desulfurizer, to be purified rear flue gas;
Flue gas after the purification is discharged by chimney.
7. method according to claim 6, it is characterised in that further include, the heat that will be obtained using air preheater preheating Oxygen-containing gas is used for fine coal Industrial Boiler as combustion adjuvant, and the temperature of the hot oxygen-containing gas is 150-300 degree Celsius.
8. method according to claim 6, it is characterised in that it is 300- that the mixed flue gas occur the temperature of reduction reaction 600 degrees Celsius.
9. method according to claim 6, it is characterised in that the denitrating catalyst is with TiO2-Al2O3Composite oxides For carrier, with activated carbon as main active, with V2O5-WO3Composite oxides are Supplementary active ingredients, with transition metal iron, Rare-earth elements of lanthanum as auxiliary agent, using enamel as additive;
Wherein, based on the denitrating catalyst oeverall quality, the TiO2-Al2O3Composite oxide supported amount is 10~60 matter Amount %, the load capacity of the activated carbon is 10~50 mass %, the V2O5-WO3The load capacity of composite oxides is 5~20 matter Amount %, the transition metal iron load capacity is 0.1~10 mass %, the rare-earth elements of lanthanum load capacity is 0.1~10 mass %, The load capacity of the enamel is 1~10 mass %.
10. method according to claim 9, it is characterised in that the denitrating catalyst is prepared through the following steps:
(1) titanium source reagent and silicon source reagent are configured to into the titanium source aqueous solution and silicon source solution respectively, and by the titanium source aqueous solution It is co-precipitated with source of aluminium solution, to prepare the precipitation mixture of titanium hydroxide and aluminium hydroxide;
(2) precipitation mixture is carried out into the first drying and the first roasting, to obtain TiO2-Al2O3Composite oxide carrier Powder;
(3) by the TiO2-Al2O3Composite oxide carrier powder is extruded with active carbon powder, enamel powder and binding agent It is molded, shapes and is dried, to obtain activated carbon/TiO2-Al2O3Composite catalyst;
(4) ammonium metatungstate, ammonium metavanadate are dissolved in oxalic acid, to obtain the first maceration extract;
(5) by the activated carbon/TiO2-Al2O3Composite catalyst carries out the first dipping in first maceration extract, completes institute The second drying and the second roasting are carried out after stating dipping, to obtain V2O5-WO3/ activated carbon/TiO2-Al2O3Composite catalyst;
(6) iron chloride, lanthanum chloride are configured to into mixed aqueous solution, to obtain the second maceration extract;And
(7) by the V2O5-WO3/ activated carbon/TiO2-Al2O3Composite catalyst carries out the second leaching in second maceration extract Stain, carries out the 3rd drying and the 3rd roasting after completing second dipping, to obtain denitrating catalyst.
CN201611217255.9A 2016-12-26 2016-12-26 Powdered coal industrial boiler flue gas denitrifying system and denitrifying method Pending CN106512687A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019228547A1 (en) * 2018-05-31 2019-12-05 郑州市天之蓝环保科技有限公司 Industrial flue gas treatment method and industrial flue gas treatment system
CN112933838A (en) * 2021-02-05 2021-06-11 江苏金广恒工业设备制造有限公司 Desulfurization and denitrification composite dedusting flue gas filtering device and filtering method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019228547A1 (en) * 2018-05-31 2019-12-05 郑州市天之蓝环保科技有限公司 Industrial flue gas treatment method and industrial flue gas treatment system
CN112933838A (en) * 2021-02-05 2021-06-11 江苏金广恒工业设备制造有限公司 Desulfurization and denitrification composite dedusting flue gas filtering device and filtering method thereof

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