CN206404564U - Fine coal industrial boiler flue gas denitrification system - Google Patents
Fine coal industrial boiler flue gas denitrification system Download PDFInfo
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- CN206404564U CN206404564U CN201621440688.6U CN201621440688U CN206404564U CN 206404564 U CN206404564 U CN 206404564U CN 201621440688 U CN201621440688 U CN 201621440688U CN 206404564 U CN206404564 U CN 206404564U
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Abstract
The utility model discloses fine coal Industrial Boiler flue gas denitrification system, including：Fine coal Industrial Boiler, cyclone separator, denitrification apparatus, air preheater, desulfurizer and chimney, wherein, reductant nozzle is provided with the burner hearth sidewall of fine coal Industrial Boiler, reductant nozzle is suitable to spray into reducing agent into burner hearth, reducing agent is mixed with fine coal Industrial Boiler flue gas in burner hearth and carries out pre- denitration process；Cyclone separator is connected with the exhanst gas outlet of fine coal Industrial Boiler；There is denitrating catalyst, denitrification apparatus is connected with cyclone separator and is suitable to carry out denitration process to flue gas in denitrification apparatus；Air preheater is connected with denitrification apparatus, and air preheater is suitable to preheat oxygen-containing gas using fume afterheat；Desulfurizer is connected with air preheater；And chimney is connected with desulfurizer.Denitration process effectively can be carried out to fine coal Industrial Boiler flue gas using the denitrating system, denitration efficiency is notable.
Description
Technical field
The utility model belongs to denitrating flue gas field, specifically, and the utility model is related to fine coal Industrial Boiler flue gas and taken off
Nitre system.
Background technology
With developing rapidly for China's economy, the fossil fuel equal energy source such as natural gas, oil and coal obtains more extensive
Using so that environmental problem is increasingly serious, therefore causes a 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 production and living of our people are not only had a strong impact on, and be 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% comes from fuel combustion process.It is various industrial furnaces, Civil energy-saving cooking stove, motor-driven
During high temperature combustion of fuel in car and other internal combustion engines, the nitrogen substance oxidation generation NO in fuelX, participate in burning air or
N in oxygen-enriched air2And O2Also NO can be generatedX.From the point of view of energy resource structure, during the primary energy and power generation energy resource of China are constituted, coal
Occupy absolute leading position.And the coal of China more than 80% directly burns, 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 the important topic that atmospheric environment is administered.
Denitrating flue gas belongs 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 and selectivity of a large amount of commercial Applications at present and non-urge
Change reducing process, other method is in experimental study stage or pilot scale stage at present.
Utility model content
The utility model is intended at least solve one of technical problem in correlation technique to a certain extent.Therefore, this reality
It is to propose fine coal Industrial Boiler flue gas denitrification system with a new purpose, is used using the denitrating system and have accumulation of heat concurrently
With the denitration heat storage of denitration function, surface is smooth, wear-resisting, and technique is simple and feasible, and it is anti-that flue gas can carry out denitration without dedusting
Should, simple to operate, denitration efficiency is high.
According to one side of the present utility model, the utility model proposes fine coal Industrial Boiler flue gas denitrification system, bag
Include：
Reductant nozzle, the reducing agent are provided with fine coal Industrial Boiler, 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 with fine coal Industrial Boiler flue gas in the burner hearth
And carry out pre- denitration process；
Cyclone separator, the cyclone separator is 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 denitrating catalyst, the denitrification apparatus and the cyclone separator phase in denitrification apparatus, the denitrification apparatus
Connect and be suitable to carry out denitration process to flue gas；
Air preheater, the air preheater is connected with the denitrification apparatus, and the air preheater is suitable to using fume afterheat to oxygen-containing
Gas is preheated；
Desulfurizer, the desulfurizer is connected with the air preheater, and the desulfurizer is suitable to remove the sulphur in flue gas
Oxide；And
Chimney, the chimney is connected with the desulfurizer.
Thus, using the fine coal Industrial Boiler flue gas denitrification system of above-described embodiment, reductant nozzle is arranged on burner hearth
On the wall of side, and then flue gas is mixed into the pre- denitration process of progress with reducing agent in burner hearth, the flue gas warp after pre- denitration process
Cross dust removal process and carry out reduction reaction progress denitration process again in denitrification apparatus, last Mist heat recovering simultaneously carries out desulfurization
Processing.The system carries out pre- denitration process, so as to the nitrogen oxidation in partial removal flue gas using high temperature in burner hearth to flue gas
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, can also be had according to the fine coal Industrial Boiler flue gas denitrification system of the utility model above-described embodiment as follows
Additional technical characteristic：
In the utility model, the denitration heat storage is spherical, strip, cylindrical shape or honeycomb ceramics shape.
In the utility model, the denitrating catalyst is that cellular and profile is in square, and the square size is
The section of through hole is square on 200mm × 200mm × 200mm, the denitrating catalyst, and size is 15mm × 15mm.
In the utility model, the section of through hole is circle on the denitrating catalyst, and aperture is 15mm.
In the utility model, the reductant nozzle is atomizer.
In the utility model, the atomizer is ammonia atomization nozzle or urea atomizer.
In the utility model, the air preheater is connected with the combustion adjuvant entrance of the fine coal Industrial Boiler, so as to suitable for
It is passed through the oxygen-containing gas after preheating as combustion adjuvant in fine coal Industrial Boiler.
Brief description of the drawings
Fig. 1 is the structural representation of the fine coal Industrial Boiler flue gas denitrification system according to the utility model one embodiment.
Fig. 2 is the fine coal Industrial Boiler flue gas denitrification system using the utility model one embodiment to fine coal Industrial Boiler
Flue gas carries out the flow chart of denitration process method.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element or element with same or like function are represented to same or similar label eventually.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model
Limitation.
According to one side of the present utility model, the utility model proposes fine coal Industrial Boiler flue gas denitrification system, under
Face describes the fine coal Industrial Boiler flue gas denitrification system of the utility model embodiment with reference to Fig. 1, including：Fine coal Industrial Boiler 100,
Cyclone separator 200, 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 burner hearth 120, reducing agent is mixed with fine coal Industrial Boiler flue gas in burner hearth and carries 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 denitrating catalyst, denitrification apparatus 300 is connected and is suitable to cyclone separator 200 in denitrification apparatus 300
Denitration process is 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 burner hearth
On the wall of side, and then flue gas is mixed into the pre- denitration process of progress with reducing agent in burner hearth, the flue gas warp after pre- denitration process
Cross dust removal process and carry out reduction reaction progress denitration process again in denitrification apparatus, last Mist heat recovering simultaneously carries out desulfurization
Processing.The system carries out pre- denitration process, so as to the nitrogen oxidation in partial removal flue gas using high temperature in burner hearth to flue gas
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 utility model specific embodiment is described below in detail.
Fine coal Industrial Boiler 100
According to embodiment of the present utility model, reductant nozzle is provided with the burner hearth sidewall of fine coal Industrial Boiler 100
110, reductant nozzle 110 is suitable to spray into reducing agent into burner hearth 120, makes reducing agent with fine coal Industrial Boiler flue gas in burner hearth
Mix and carry out pre- denitration process.Thus, reducing agent is sprayed into the burner hearth of fine coal Industrial Boiler by reductant nozzle, made also
Former agent mixes in burner hearth with fine coal Industrial Boiler flue gas and carries out pre- denitration process.
According to embodiment of the present utility model, reductant nozzle is arranged on burner hearth, reducing agent spray after can Quick-gasifying or
Gaseous ammonia is resolved into, and is mixed with high-temperature flue gas rapidly, and in burner hearth in the presence of high temperature, the nitrogen oxides in flue gas is with going back
Reduction reaction occurs for former agent, 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
The consumption of out of stock catalyst, reduces operating cost.
According to specific embodiment of the utility model, reductant nozzle is atomizer.Thus effervescent atomization technology is used,
Using high pressure air or oxygen-enriched air as atomizing medium, it is small droplet, droplet to make the moment atomization that reducing agent sprays
Grain can reach less than 40 μm, can be good at being well mixed with flue gas.
According to specific embodiment of the utility model, atomizer can be ammonia atomization nozzle or urea atomization spray
Mouth.Thus spray into ammoniacal liquor into burner hearth 120 or urea is used as reducing agent.Make reducing agent with fine coal Industrial Boiler flue gas in burner hearth
Mix and carry out pre- denitration process, so as to improve overall denitration efficiency.
Cyclone separator 200
According to embodiment of the present utility model, the exhanst gas outlet 120 of cyclone separator 200 and fine coal Industrial Boiler 100
It is connected, cyclone separator 200 is suitable to carry out dust removal process to flue gas.Thus, the mixing discharged out of fine coal Industrial Boiler is made
Flue gas enters cyclone separator, to carry out dust removal process to mixed flue gas.
According to embodiment of the present utility model, fine coal Industrial Boiler it is raw materials used can for anthracite, jet coal, bituminous coal,
The one or more such as lignite, Task-size Controlling is between 50~500 μm.Therefore, meeting while pulverized coal friring produces high-temperature flue gas
Produced with substantial amounts of dust, and as flue gas is discharged.By carrying out dedusting to flue gas using cyclone separator 200 in advance
Processing, can further improve the denitration process efficiency of follow-up denitrification apparatus.
Denitrification apparatus 300
According to embodiment of the present utility model, there is denitrating catalyst, denitrification apparatus 300 and whirlwind in denitrification apparatus 300
Separator 200 is connected and is suitable to carry out denitration process to flue gas.Thus, make to enter denitration by the mixed flue gas of dust removal process
Device, to make mixed flue gas occur reduction reaction removing nitrogen oxides in the presence of denitrating catalyst.
According to embodiment of the present utility model, denitration heat storage is spherical, strip, cylindrical shape or honeycomb ceramics shape.
According to embodiment of the present utility model, denitrating catalyst is that cellular and profile is in square, and square size is
The section of through hole is square on 200mm × 200mm × 200mm, denitrating catalyst, and size is 15mm × 15mm.
According to embodiment of the present utility model, the section of through hole can also be circle on denitrating catalyst, and aperture is 15mm.
According to embodiment of the present utility model, denitrating catalyst is with TiO2-Al2O3Composite oxides are carrier, with activated carbon
For main active, with V2O5-WO3Composite oxides are Supplementary active ingredients, using transition metal iron, rare-earth elements of lanthanum as
Auxiliary agent, additive is used as using enamel；
Wherein, based on denitrating catalyst oeverall quality, TiO2-Al2O3Composite oxide supported amount is 10~60 mass %,
The load capacity of activated carbon is 10~50 mass %, V2O5-WO3The load capacity of composite oxides is 5~20 mass %, transition metal
Iron load capacity is that 0.1~10 mass %, rare-earth elements of lanthanum load capacity are 0.1~10 mass %, and the load capacity of enamel is 1~10 matter
Measure %.
According to specific embodiment of the utility model, the burn high-temperature flue gas produced and the reducing agent being arranged on burner hearth spray
The reducing agent hybrid concurrency that mouth sprays is survived after former reactive moieties removing nitrogen oxides, is come out from pulverized coal boiler burner hearth, through convection current
After tube bank, flue-gas temperature, which is reduced to after 300-600 DEG C after cyclone separator rough dusting, enters denitrification apparatus.In denitration dress
Have in putting in the presence of denitrating catalyst, with ammonia reduction reaction occurs for the nitrogen oxides in flue gas, removes nitrogen oxides, takes off
Except efficiency is up to more than 98%.Flue gas after denitration is through the abundant recovery waste heat of air preheater, subsequently into flue gas desulphurization system, removing
After sulfide in flue gas, externally discharged by chimney.According to specific embodiment of the utility model, flue gas is in denitrification apparatus
The temperature for occurring reduction reaction is 300-600 degrees Celsius.It is possible thereby to further improve catalytic denitration reaction, nitrogen oxides is improved
Removal efficiency.
Air preheater 400
According to embodiment of the present utility model, air preheater 400 is connected with denitrification apparatus 300, and air preheater 400 is suitable to utilize cigarette
Gas waste heat is preheated to oxygen-containing gas.Thus, the flue gas of removing nitrogen oxides is made to enter air preheater, to utilize fume afterheat
Preheat oxygen-containing gas.
According to embodiment of the present utility model, air preheater is connected with the combustion adjuvant entrance of fine coal Industrial Boiler, so as to suitable for
It is passed through the oxygen-containing gas after preheating as combustion adjuvant in fine coal Industrial Boiler.It is possible thereby to will preheat what is obtained using air preheater
Hot oxygen-containing gas is used for fine coal Industrial Boiler as combustion adjuvant, and the temperature of hot oxygen-containing gas is 150-300 degrees Celsius.
Desulfurizer 500 and chimney 600
According to embodiment of the present utility model, desulfurizer 500 is connected with air preheater 400, and desulfurizer 500 is suitable to remove
Oxysulfide in flue gas；And chimney 600 is connected with desulfurizer 500.Thus, enter the flue gas after dust removal process
Desulfurizer carries out desulfurization process, and to be purified rear flue gas, flue gas after purification is discharged by chimney.
The fine coal Industrial Boiler flue gas denitrification system of the utility model above-described embodiment is understood for convenience, below to utilizing
The method that the system carries out denitration process to fine coal Industrial Boiler flue gas is described in detail.
According to embodiment of the present utility model, this method includes：By burner hearth from reductant nozzle to fine coal Industrial Boiler
Interior penetrating reducing agent, makes reducing agent be mixed with fine coal Industrial Boiler flue gas in burner hearth and carries out pre- denitration process；Make from fine coal
The mixed flue gas of discharge enters cyclone separator in Industrial Boiler, to carry out dust removal process to mixed flue gas；Make by except
The mixed flue gas of dirt processing enters denitrification apparatus, is taken off to make mixed flue gas occur reduction reaction in the presence of denitrating catalyst
Denitrification；The flue gas of removing nitrogen oxides is set to enter air preheater, to preheat oxygen-containing gas using fume afterheat；Make by
Flue gas after dust removal process enters desulfurizer and carries out desulfurization process, to be purified rear flue gas；Flue gas is by cigarette after purifying
Chimney is discharged.
Thus, using the fine coal Industrial Boiler denitration method for flue gas of above-described embodiment, reductant nozzle is arranged on burner hearth
On the wall of side, and then flue gas is mixed into the pre- denitration process of progress with reducing agent in burner hearth, the flue gas warp after pre- denitration process
Cross dust removal process and carry out reduction reaction progress denitration process again in denitrification apparatus, last Mist heat recovering simultaneously carries out desulfurization
Processing.The system carries out pre- denitration process, so as to the nitrogen oxidation in partial removal flue gas using high temperature in burner hearth to flue gas
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 utility model specific embodiment is described in detail below with reference to Fig. 2.
S100：Pre- denitration process in burner hearth
According to embodiment of the present utility model, reduction is sprayed into the burner hearth of fine coal Industrial Boiler by reductant nozzle
Agent, makes reducing agent be mixed with fine coal Industrial Boiler flue gas in burner hearth and carries out pre- denitration process.
According to embodiment of the present utility model, reductant nozzle is arranged on burner hearth, reducing agent spray after can Quick-gasifying or
Gaseous ammonia is resolved into, and is mixed with high-temperature flue gas rapidly, and in burner hearth in the presence of high temperature, the nitrogen oxides in flue gas is with going back
Reduction reaction occurs for former agent, 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
The consumption of out of stock catalyst, reduces operating cost.
According to specific embodiment of the utility model, reductant nozzle is atomizer.Thus effervescent atomization technology is used,
Using high pressure air or oxygen-enriched air as atomizing medium, it is small droplet, droplet to make the moment atomization that reducing agent sprays
Grain can reach less than 40 μm, can be good at being well mixed with flue gas.
According to specific embodiment of the utility model, atomizer can be ammonia atomization nozzle or urea atomization spray
Mouth.Thus spray into ammoniacal liquor into burner hearth 120 or urea is used as reducing agent.Make reducing agent with fine coal Industrial Boiler flue gas in burner hearth
Mix and carry out pre- denitration process, so as to improve overall denitration efficiency.
S200：Dust removal process
According to embodiment of the present utility model, the mixed flue gas discharged out of fine coal Industrial Boiler is set to be filled into cyclonic separation
Put, to carry out dust removal process to mixed flue gas.
According to embodiment of the present utility model, fine coal Industrial Boiler it is raw materials used can for anthracite, jet coal, bituminous coal,
The one or more such as lignite, Task-size Controlling is between 50~500 μm.Therefore, meeting while pulverized coal friring produces high-temperature flue gas
Produced with substantial amounts of dust, and as flue gas is discharged.By being carried out in advance using cyclone separator to flue gas at dedusting
Reason, can further improve the denitration process efficiency of follow-up denitrification apparatus.
S300：Reduction reaction removes nitrogen oxides
According to embodiment of the present utility model, make to enter denitrification apparatus by the mixed flue gas of dust removal process, so as to de-
Mixed flue gas is set to occur reduction reaction removing nitrogen oxides in the presence of denox catalyst.
According to embodiment of the present utility model, denitration heat storage is spherical, strip, cylindrical shape or honeycomb ceramics shape.
According to embodiment of the present utility model, denitrating catalyst is that cellular and profile is in square, and square size is
The section of through hole is square on 200mm × 200mm × 200mm, denitrating catalyst, and size is 15mm × 15mm.
According to embodiment of the present utility model, the section of through hole can also be circle on denitrating catalyst, and aperture is 15mm.
According to embodiment of the present utility model, denitrating catalyst is with TiO2-Al2O3Composite oxides are carrier, with activated carbon
For main active, with V2O5-WO3Composite oxides are Supplementary active ingredients, using transition metal iron, rare-earth elements of lanthanum as
Auxiliary agent, additive is used as using enamel；
Wherein, based on denitrating catalyst oeverall quality, TiO2-Al2O3Composite oxide supported amount is 10~60 mass %,
The load capacity of activated carbon is 10~50 mass %, V2O5-WO3The load capacity of composite oxides is 5~20 mass %, transition metal
Iron load capacity is that 0.1~10 mass %, rare-earth elements of lanthanum load capacity are 0.1~10 mass %, and the load capacity of enamel is 1~10 matter
Measure %.
According to specific embodiment of the utility model, the burn high-temperature flue gas produced and the reducing agent being arranged on burner hearth spray
The reducing agent hybrid concurrency that mouth sprays is survived after former reactive moieties removing nitrogen oxides, is come out from pulverized coal boiler burner hearth, through convection current
After tube bank, flue-gas temperature, which is reduced to after 300-600 DEG C after cyclone separator rough dusting, enters denitrification apparatus.In denitration dress
Have in putting in the presence of denitrating catalyst, with ammonia reduction reaction occurs for the nitrogen oxides in flue gas, removes nitrogen oxides, takes off
Except efficiency is up to more than 98%.Flue gas after denitration is through the abundant recovery waste heat of air preheater, subsequently into flue gas desulphurization system, removing
After sulfide in flue gas, externally discharged by chimney.According to specific embodiment of the utility model, flue gas is in denitrification apparatus
The temperature for occurring reduction reaction is 300-600 degrees Celsius.It is possible thereby to further improve catalytic denitration reaction, nitrogen oxides is improved
Removal efficiency.
According to embodiment of the present utility model, denitrating catalyst is prepared through the following steps：
(1) titanium source reagent and silicon source reagent are configured to 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 first to dry 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 dries, 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, completes after dipping
Carry out second to dry and the second roasting, to obtain V2O5-WO3/ activated carbon/TiO2-Al2O3Composite catalyst；
(6) iron chloride, lanthanum chloride are configured to 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
Carry out the 3rd after into the second dipping to dry and the 3rd roasting, to obtain denitrating catalyst.
According to embodiment of the present utility model, the preparation method of denitrating catalyst is 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, stir, titanium source and silicon source solution are made respectively, the ratio between both concentration are 1：(0.01~2).By titanium source solution, silicon source
Solution, ammoniacal liquor are instilled in the reactor equipped with a small amount of deionized water by certain flow rate, set in the reactor by way of cocurrent
There is agitating device, it is ensured that solution is well mixed, reaction is abundant.Titanium source solution is identical with silicon source solution instillation speed, controls ammoniacal liquor
Instillation speed, the pH value of reaction solution is controlled between 9~11, co-precipitation obtains titanium hydroxide and the precipitation of aluminium hydroxide is mixed
Compound.By the sediment suction filtration, washing, it is repeated several times, up to pH value to 7 or so.Then 8 are dried under the conditions of 85~115 DEG C
After~15h, 5~8h is calcined under the conditions of 350~600 DEG C, TiO is obtained2-Al2O3Composite oxide carrier.
(2) active component is loaded
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 is shaped under the conditions of 95~115 DEG C, 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 isometric solution, and the mol ratio of vanadium tungsten is 1 wherein in the solution：
(0.1~5).Dipping temperature is normal temperature, 5~8h of dip time, dries 8~15h after the completion of dipping under the conditions of 85~115 DEG C
Afterwards, 5~8h is calcined under the conditions of 350~600 DEG C.
(3) auxiliary agent is loaded
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 is dipped in isometric solution, dipping temperature is normal temperature, dip time 5~
After drying 8~15h under the conditions of 85~115 DEG C after the completion of 8h, dipping, 5~8h is calcined under the conditions of 350~600 DEG C, is made pottery
Porcelain is the denitrating catalyst finished product of additive.
If the profile of denitrating catalyst can be using catalyst to be spherical, catalyst diameter can be 3~6mm；If catalyst is
Strip, catalyst is 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., the section of through hole is square on denitrating catalyst, and size is 10mm
The section of through hole can also be circle on × 10mm or 15mm × 15mm, denitrating catalyst, and radius is 10mm or 15mm.Outside
Shape, size, aperture are determined after being considered according to composite factors such as specific 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 more efficient.When catalyst is honeycomb ceramics shape, the specific surface area of denitrating catalyst is in 320m2/m3More than, machine
Tool intensity ＞ 2MPa, the catalytic activity of nitrogen oxides reduction may be up to more than 98%.
In denitration scheme of the present utility model, a large amount of dust is contained in the high-temperature flue gas come out from fine coal Industrial Boiler, is passed through
Cyclone dust collector is removed after most of dust, and denitration reaction is carried out into denitrating system.The utility model is using cellular de-
Denox catalyst, is arranged in the denitration space of square, denitrating catalyst use square form, size from 200mm ×
The section of through hole is square on 200mm × 200mm, denitrating catalyst, and size is 15mm × 15mm.Due to from the industrial pot of fine coal
Contain a large amount of dust in the high-temperature flue gas that stove comes out, although eliminate most of dust by cyclone dust collector, but in flue gas
Also contain a certain amount of dust, therefore, the aperture that the denitration accumulation of heat honeycomb ceramics selected herein is used can not be too small.But this practicality is new
Type uses the accumulation of heat denitration honeycomb ceramics added with enamel, and its surface is smooth, wear-resisting, with good anti-clogging, selects
The accumulation of heat denitration honeycomb ceramics of above-mentioned size is with regard to that can reach good denitration effect.
S400：Fume afterheat is utilized
According to embodiment of the present utility model, the flue gas of removing nitrogen oxides is set to enter air preheater, more than utilization flue gas
Heat preheating oxygen-containing gas.
According to embodiment of the present utility model, above-mentioned method of denitration further comprises, will preheat what is obtained using air preheater
Hot oxygen-containing gas is used for fine coal Industrial Boiler as combustion adjuvant, and the temperature of hot oxygen-containing gas is 150-300 degrees Celsius.Thus it is abundant
The high-temperature flue gas waste heat produced using burning, energy-efficient, energy utilization rate is high.
S500：Desulfurization process
According to embodiment of the present utility model, the flue gas after dust removal process is entered desulfurizer and carry out at desulfurization
Reason, to be purified rear flue gas；Flue gas after purification is discharged by chimney.
According to embodiment of the present utility model, the fine coal Industrial Boiler flue gas denitrification system of the utility model above-described embodiment
At least there are one of following advantages with method of denitration：
(1) denitrating catalyst containing enamel is used, 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 after convection bank is reduced to 300-600 DEG C, and denitration is carried out into denitrating system
After processing, then abundant recovery waste heat is externally discharged by chimney after desulfurization, reduces exhaust gas temperature, is reduced smoke evacuation and is damaged
Lose, reduce nitrogen oxide emission, energy-efficient, environmental protection.
(3) air/oxygen-enriched air is heated to after 150~300 DEG C by air preheater and participates in burning, and 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 under burner hearth, high temperature action of the reducing agent in burner hearth, the high temperature produced with burning
Reduction reaction occurs for 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 into boiler furnace by nozzle, with sending into burner hearth by air blower
Burnt after interior air mixing, temperature is up to more than 1050 DEG C in burner hearth.It is arranged at the atomization reductant nozzle spray of burner hearth
Go out urea droplet, in burner hearth in the presence of high temperature, the nitrogen that urea fast decoupled goes out in ammonia, the high-temperature flue gas that ammonia is produced with burning
Reduction reaction, the configured convection tube in burner hearth smoke outlet of high-temperature flue gas of partial removal nitrogen oxides occur for oxide
Beam, heats softened water therein.
Temperature is reduced to 500 DEG C of flue gas and enters denitrating system after cyclone dust collector rough dusting.In out of stock catalysis
In the presence of agent, with ammonia reduction reaction occurs for the nitrogen oxides in flue gas, further removes nitrogen oxides, removal efficiency is reachable
98%.Flue gas after denitration, subsequently into flue gas desulphurization system, removes the sulfide in flue gas through the abundant recovery waste heat of air preheater
Afterwards, externally discharged by chimney.
The air for sending into burner hearth above by air blower is sent into burner hearth after air preheater is preheated to 250 DEG C and mixed with fine coal
Burnt after conjunction, efficiency of combustion can be effectively improved, saved raw material dosage, cut operating costs.
The specific 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
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present utility model or example.In this manual, to the schematic table of above-mentioned term
Identical embodiment or example need not be directed to by stating.Moreover, specific features, structure, material or the feature of description can be
Combined in an appropriate manner in any one or more embodiments or example.In addition, in the case of not conflicting, this area
Technical staff can be carried out the feature of the not be the same as Example described in this specification or example and non-be the same as Example or example
With reference to and combination.
Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is
Exemplary, it is impossible to it is interpreted as to limitation of the present utility model, one of ordinary skill in the art is in scope of the present utility model
It is interior above-described embodiment to be changed, changed, replaced and modification.
Claims (7)
1. a kind of fine coal Industrial Boiler flue gas denitrification system, it is characterised in that including：
Reductant nozzle, the reductant nozzle are provided with fine coal Industrial Boiler, the burner hearth sidewall of the fine coal Industrial Boiler
Suitable for spraying into reducing agent into the burner hearth, the reducing agent is mixed with fine coal Industrial Boiler flue gas in the burner hearth and go forward side by side
The pre- denitration process of row；
Cyclone separator, the cyclone separator is 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, has denitrating catalyst in the denitrification apparatus, the denitrification apparatus be connected with the cyclone separator and
It is suitable to carry out denitration process to flue gas；
Air preheater, the air preheater is connected with the denitrification apparatus, and the air preheater is suitable to using fume afterheat to oxygen-containing gas
Preheated；
Desulfurizer, the desulfurizer is connected with the air preheater, and the desulfurizer is suitable to remove the sulphur oxidation in flue gas
Thing；And
Chimney, the chimney is 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 is in square, and the square size is through hole on 200mm × 200mm × 200mm, the denitrating catalyst
Section for square, size be 15mm × 15mm.
4. fine coal Industrial Boiler flue gas denitrification system according to claim 2, it is characterised in that on the denitrating catalyst
The section of through hole is circle, and aperture is 15mm.
5. fine coal Industrial Boiler flue gas denitrification system according to claim 1, it is characterised in that the reductant nozzle is
Atomizer.
6. fine coal Industrial Boiler flue gas denitrification system according to claim 5, it is characterised in that the atomizer is ammonia
Water atomizing nozzle or urea atomizer.
7. 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, so as to suitable for being passed through fine coal industry using the oxygen-containing gas after preheating as combustion adjuvant
In boiler.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621440688.6U CN206404564U (en) | 2016-12-26 | 2016-12-26 | Fine coal industrial boiler flue gas denitrification system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621440688.6U CN206404564U (en) | 2016-12-26 | 2016-12-26 | Fine coal industrial boiler flue gas denitrification system |
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| Publication Number | Publication Date |
|---|---|
| CN206404564U true CN206404564U (en) | 2017-08-15 |
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| CN201621440688.6U Expired - Fee Related CN206404564U (en) | 2016-12-26 | 2016-12-26 | Fine coal industrial boiler flue gas denitrification system |
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| Country | Link |
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2016
- 2016-12-26 CN CN201621440688.6U patent/CN206404564U/en not_active Expired - Fee Related
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