CN108310972A - The multi-functional catalytic reactor and its application that CO catalysis oxidations are coupled with SCR denitration - Google Patents
The multi-functional catalytic reactor and its application that CO catalysis oxidations are coupled with SCR denitration Download PDFInfo
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- CN108310972A CN108310972A CN201810233296.XA CN201810233296A CN108310972A CN 108310972 A CN108310972 A CN 108310972A CN 201810233296 A CN201810233296 A CN 201810233296A CN 108310972 A CN108310972 A CN 108310972A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
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- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
The present invention provides a kind of multi-functional catalytic reactor that CO catalysis oxidations are coupled with SCR denitration and its application, includes flue gas main entrance, reactor body and flue gas general export successively by the flow direction of flue gas；It include at least one reaction member inside the reactor body, each reaction member includes the first reaction warehouse of the placement CO oxidation reaction catalysts being arranged in series and places the second reaction warehouse of SCR catalysts, first reaction warehouse has the gas inlet that can be connected to the flue gas main entrance, second reaction warehouse has the exhanst gas outlet being connected to the flue gas general export, first reaction warehouse is arranged side by side with second reaction warehouse and is separated with the first heat-conducting plate, and first reaction warehouse and second reaction warehouse be connected with each other it is logical formed allow flue gas by the first smoke reaction channel.The heat transfer that the present invention is released CO oxidation reactions using heat-conducting plate improves capacity usage ratio to SCR reaction zones, reduces the operating cost that flue gas reheats.
Description
Technical field
The multi-functional catalytic reactor that the present invention relates to CO catalysis oxidations to couple with SCR denitration, belongs to field of environment protection.
Background technology
A large amount of high-temp combustion process is often referred in metallurgy industry, to produce a large amount of nitrogen oxides (NOx),
In Chemical Manufacture, oil gas refining, coal-fired power generation field also will produce rich in NOxFlue gas.Denitration process refers to generated
NOxIt is reduced to N2, to remove the NO in flue gasx, the technique for comparing mainstream in the world is divided into：SCR and SNCR.
SCR (Selective Catalytic Reduction) selective catalytic reduction denitration technology is the current world
On the gas denitrifying technology that is most widely used, all answered substantially in most of power plant of the countries and regions such as Japan, Europe, the U.S.
With this technology, it does not have by-product, does not form secondary pollution, and apparatus structure is simple, and high (up to 90% with removal efficiency
More than), it is reliable for operation, the advantages that convenient for safeguarding.
SCR technology principle is：Under the action of catalyst, ammonia is sprayed into the flue gas of certain temperature, by NOxIt is reduced into N2With
H2O.But current SCR catalyst mainly for denitration operating mode be (220 DEG C~420 DEG C) under the conditions of high temperature NOxIt is de-
It removes, and the flue-gas temperature for needing denitration generated in practical metallurgical production process is all relatively low, for example sintering flue gas generally exists
120 DEG C or so, coking flue gas at 200 DEG C or so, in addition these flue gases it may also be desirable to by after the techniques such as dust-removal and desulfurizing
It can enter in SCR reactors, often more required denitration reaction temperature is lower for flue-gas temperature at this time, needs to set using heating
It is standby flue gas is heated after be re-fed into SCR reactors, flue gas reheat process, which needs to consume combustion gas, heats flue gas, one
As steel industry can all select to carry out flue gas using blast furnace gas or the mixture combustion of blast furnace gas and coke-stove gas it is pre-
Heat, this kind of technical solution are generally used, and certain operating cost is will produce using heating furnace, additionally due to domestic considerable
Steel industry desulphurization denitration project belongs to rear transformation project, since place limitation often results in hot-blast stove small volume, burns
Heating region is shorter, and gas-fired is simultaneously insufficient, therefore the unburned CO gases of suitable content can be caused to enter in flue gas, a side
Face can cause flue gas emission problem not up to standard when itself too high levels of these CO, and on the other hand, the presence of CO can also be to flue gas
Component measuring device impacts, and forms interference signal so that other pollutant emissions are not up to standard in flue gas.It is more significant
Although being that CO is discharged at present not yet in Ferrous Metallurgy, the industries such as Chemical Manufacture make emission request, for waste incineration row
Already through there is specific CO emission requests, it is believed that with the continuous reinforcement of environment protection treating dynamics, for CO emission level highers
Ferrous Metallurgy process also very likely put into effect CO discharge relevant regulations.
Invention content
For response environment requirement, coupled with SCR denitration one of the objects of the present invention is to provide a kind of CO catalysis oxidations
Multi-functional catalytic reactor, which can make CO catalysis oxidations and the organic concerted reaction of SCR denitration, while can be suitable for
Actual production operating mode, and reaction heat can be made to be utilized effectively.
Another object of the present invention is to provide the applications of above-mentioned multi-functional catalytic reactor.
To achieve the above object, the present invention provides a kind of CO catalysis oxidations and is reacted with the multi-functional catalysis that SCR denitration couples
Device includes flue gas main entrance, reactor body and flue gas general export successively by the flow direction of flue gas；
Include at least one reaction member inside the reactor body, each reaction member includes being arranged in series
It places the first reaction warehouse of CO oxidation reaction catalysts and places the second reaction warehouse of SCR catalysts, first reaction
Storehouse has the gas inlet that can be connected to with the flue gas main entrance, and second reaction warehouse has to be connected with the flue gas general export
Logical exhanst gas outlet, first reaction warehouse is arranged side by side with second reaction warehouse and is separated with the first heat-conducting plate, and institute
State the first reaction warehouse and second reaction warehouse be connected with each other it is logical formed allow flue gas by the first smoke reaction channel.
The multi-functional catalytic reactor that CO catalysis oxidations as described above are coupled with SCR denitration, wherein second reaction
Storehouse by be disposed therein the transverse slat of lower part be divided into stringer board the first SCR reaction zones being sequentially connected to, the 2nd SCR reaction zones and
3rd SCR reaction zones, the stringer board are the second heat-conducting plate, and the first SCR reaction zones and the 3rd SCR reaction zones are simultaneously arranged
It sets and is separated with second heat-conducting plate, the 2nd SCR reaction zones are located at the first SCR reaction zones and the third
The top of SCR reaction zones, the first SCR reaction zones are connected by diversion elbow with the bottom of first reaction warehouse, institute
The bottom for stating the 2nd SCR reaction zones is connected with the first SCR reaction zones with the 3rd SCR reaction zones respectively, and described
The top of two SCR reaction zones is opened towards flue gas main entrance direction；
It is equipped with the first flapper door that can be swung in the gas inlet of first reaction warehouse, first reaction warehouse
The top of gas inlet and the 2nd SCR reaction zones is alternately opened and closed by the reciprocally swinging of the first flapper door；
The the second flapper door that can be swung is equipped in the diversion elbow, the diversion elbow passes through the second flapper door
Reciprocally swinging and open and close；
When the first flapper door closes the gas inlet of first reaction warehouse and opens the 2nd SCR reactions
The top in area, and when the second flapper door closing diversion elbow, the flue gas main entrance, the 2nd SCR are anti-
Answer area, the 3rd SCR reaction zones and the flue gas general export be sequentially communicated to be formed allow flue gas by the second smoke reaction
Channel.
The multi-functional catalytic reactor that CO catalysis oxidations as described above are coupled with SCR denitration, wherein first activity
The both ends of baffle door are respectively the first connecting pin and the first swinging end, and first connecting pin is can rotating with first heat conduction
Plate upper end connects, and first swinging end can be covered in the top of the 2nd SCR reaction zones or be covered in first reaction
On the smoke inlet in storehouse；The second flapper door both ends are respectively second connection end and the second swinging end, and described second connects
It connects end with what the diversion elbow inner wall can rotate to be connected, second swinging end can be overlapped on second heat-conducting plate lower end
Or it is plugged on the diversion elbow.
The multi-functional catalytic reactor that CO catalysis oxidations as described above are coupled with SCR denitration, wherein the reaction member
It is laid with two or more side by side, the first of the first adjacent reaction members of flapper Men Nengyu of each reaction member lives
Dynamic baffle mutually overlaps and is covered in the top of the corresponding 2nd SCR reaction zones or is covered in the cigarette of first reaction warehouse
On gas entrance.
The multi-functional catalytic reactor that CO catalysis oxidations as described above are coupled with SCR denitration, wherein described first swings
It is mounted on flexible sealing strip on end and second swinging end.
The multi-functional catalytic reactor that CO catalysis oxidations as described above are coupled with SCR denitration, wherein the flexible sealing
Item is that all steel flexible sealing strip, fluoroether rubber flexible sealing strip, flexible sealing strip fluorubber or polytetrafluoroethylene (PTFE) flexibility are close
Strip of paper used for sealing.
The multi-functional catalytic reactor that CO catalysis oxidations as described above are coupled with SCR denitration, wherein total in the flue gas
Inlet is equipped with deflector and/or arranges grid.
The multi-functional catalytic reactor that CO catalysis oxidations as described above are coupled with SCR denitration, wherein first heat conduction
Plate and second heat-conducting plate are mild steel heat-conducting plate, low-alloy steel heat-conducting plate or metal-plated enamel heat-conducting plate.
On the other hand, the multi-functional catalytic reactor that present invention offer CO catalysis oxidations are coupled with SCR denitration is in
Application in high temperature SCR reaction purifying smokes.
Preferably, the flue gas is the sintering flue gas or coking flue gas containing CO or without containing CO.It is highly preferred that described contain
CO and NOxSintering flue gas or coking flue gas be mixture combustion pair using blast furnace gas or blast furnace gas and coke-stove gas
What flue gas generated after being preheated.
In summary, the present invention has following advantageous effects：
1, CO oxidations are reacted with SCR denitration and are integrated into a reactor by subregion cascade by the present invention, can root
It adjusts to the relative size of the oxidation reaction zones CO and SCR denitration reaction zone according to the demand of actual condition, modularized design is convenient for
Adjustment is implemented.
2, the present invention, which reacts CO, reacts the concatenated heat pair for being advantageous in that and CO oxidations being utilized to release with SCR denitration
Flue gas is conducive to SCR reactions and carries out, while being available with heat-conducting plate using two kinds of spaced advantages of reaction zone will
The heat transfer that CO oxidation reactions are released improves capacity usage ratio to SCR reaction zones, reduces the operating cost that flue gas reheats.
3, the short circuit of the oxidation reaction zones CO, this set can be adapted to different in production by the design of flapper door
Working condition, when process upstream flue-gas temperature, which reaches SCR, reacts required temperature, hot-blast stove no longer works, and does not need then at this time
Using the oxidation reaction zones CO, CO reaction zones can be closed by adjusting baffle door, CO oxidation catalysts is saved, extends using the longevity
Life.
4, the present invention also has while handling the potentiality to be exploited of multi-pollutant, the first SCR reaction zones and the 3rd SCR reaction zones
It can also be arranged to the catalysis abjection area for other pollutants, such as the catalysis oxidation area of the organic matters such as VOCs He bioxin,
This pollutant catalytic reaction temperature section reacts close with SCR denitration, can be placed according to process requirements before and after SCR processes.
Description of the drawings
Fig. 1 is the multi-functional catalytic reactor that CO catalysis oxidations are coupled with SCR denitration used in the embodiment of the present invention
A kind of internal perspective view of preferred structure.
Fig. 2 is the multi-functional catalytic reactor inside top figure of Fig. 1.
Fig. 3 is internal perspective view of the multi-functional catalytic reactor of Fig. 1 when CO catalysis oxidations area is short-circuited.
Figure label has following meaning：
1- flue gases main entrance；2- reactor bodies；3- flue gas general exports；4- reaction members；The first reaction warehouses of 5-；6- second
Reaction warehouse；The first SCR reaction zones of 61-；The 2nd SCR reaction zones of 62-；The 3rd SCR reaction zones of 63-；The first heat-conducting plates of 7-；8- second
Heat-conducting plate；9- diversion elbows；10- flexible sealing strips；11- the first flapper doors；The first connecting pins 111-；112- first is swung
End；12- the second flapper doors；121- second connection ends；The second swinging ends of 122-；13- deflectors；14- arranges grid.
Specific implementation mode
In order to which technical characteristic, purpose and the advantageous effect to the present invention are more clearly understood, in conjunction with specific implementation
Example and technical scheme of the present invention is carried out described further below, it should be understood that these examples be merely to illustrate the present invention rather than
It limits the scope of the invention.In embodiment, each Starting reagents material is commercially available, test method without specific conditions
For conventional method known to fields and normal condition, or according to the condition proposed by apparatus manufacturer.
In the present invention, CO oxidation reaction catalysts are existing catalyst, can be metal-oxide catalyst, by
The oxide of single metal or various metals forms.
SCR catalysts are existing catalyst, and operating temperature is 250 DEG C to 400 DEG C, this kind of catalyst can be vanadium titanium
Series catalysts, important activity group are divided into vanadic anhydride and titanium oxide.
SCR of the present invention refers to selective catalytic reduction (selective catalytic reduction), utilizes catalyst
With reducing agent to NOxFlue gas carries out the technology of reduction purification.
CO catalysis oxidations of the present invention refer to that toxic gas CO is occurred with oxygen at a lower temperature by using catalyst
Catalytic oxidation generates nontoxic CO2Process.
The inside for the multi-functional catalytic reactor that the CO catalysis oxidations that following embodiment of the present invention is selected are coupled with SCR denitration
Perspective view is as shown in Figure 1, state shown in FIG. 1 is applicable to operating mode (the process upstream flue gas temperature using the oxidation reaction zones CO
When degree is unable to reach SCR reaction required temperatures, hot-blast stove needs work).The inside top figure of Fig. 1 is as shown in Figure 2.Fig. 3 is Fig. 1
Internal perspective view of the multi-functional catalytic reactor when CO catalysis oxidations area is short-circuited, state shown in Fig. 3 is suitable for being not required to
Will use the oxidation reaction zones CO operating mode (process upstream flue-gas temperature have reached SCR reaction required temperature when, hot-blast stove does not need
Work).
As shown in Figure 1 to Figure 3, the multi-functional catalysis that CO catalysis oxidations used in following embodiment are coupled with SCR denitration
Reactor includes that flue gas main entrance 1, reactor body 2 and flue gas are total successively by flue gas from the flow direction in upstream to downstream
Outlet 3；2 inside of the reactor body includes the reaction member 4 of three repetitions being set up in parallel, and the quantity of reaction member 4 can
It is arranged as required to one, two or more, the invention is not limited in this regard.Each reaction member 4 is (by dotted line frame in Fig. 1
Outline) what is be arranged in series includes the first reaction warehouse 5 and SCR reaction zones that CO oxidation reaction catalysts are placed in CO catalysis oxidations area
The second reaction warehouse 6 of SCR catalysts is placed, 5 upper end of the first reaction warehouse is equipped with gas inlet, and lower end goes out equipped with flue gas
Mouthful, 6 upper and lower end of the second reaction warehouse passes in and out for flue gas, and the first reaction warehouse 5 is arranged side by side with the second reaction warehouse 6 and is led with first
Hot plate 7 separates, which is used to give the heat transfer that CO catalysis oxidations area generates to SCR reaction zones, the first reaction warehouse
5 and second reaction warehouse 6 be connected with each other it is logical formed allow flue gas by the first smoke reaction channel.
As shown in Figure 1, the second reaction warehouse 6 is divided into sequentially be connected to with stringer board by being disposed therein the transverse slat of lower part
One SCR reaction zones 61, the 2nd SCR reaction zones 62 and the 3rd SCR reaction zones 63, stringer board are the second heat-conducting plate 8, the first SCR reactions
Area 61 is arranged side by side with the 3rd SCR reaction zones 63 and is separated with the second heat-conducting plate 8, and the 2nd SCR reaction zones 62 are located at institute
The top of the first SCR reaction zones 61 and the 3rd SCR reaction zones 63 is stated, the first SCR reaction zones 61 pass through diversion elbow 9
It is connected with the bottom of first reaction warehouse 5, flue gas is imported into the first SCR reaction zones 61 from the first reaction warehouse 5, water conservancy diversion is curved
9 are formed by extending back bending below 5 warehouse lateral wall of the first reaction warehouse and being connect with second heat-conducting plate 8.2nd SCR is anti-
The bottom in area 62 is answered to be connected respectively with the 3rd SCR reaction zones 63 with the first SCR reaction zones 61 so that flue gas can be according to
It is secondary to flow through the first reaction warehouse 5, the first SCR reaction zones 61, the 2nd SCR reaction zones 62 and the 3rd SCR reaction zones 63 and total by flue gas
3 discharge of outlet.The top of the 2nd SCR reaction zones 62 is opened towards flue gas main entrance direction so that when the first flue gas
When reaction channel is closed, flue gas can be entered by the 2nd SCR reaction zones 62, have the function that keep CO catalysis oxidations area short-circuit, specifically
Content is described in more detail below.
It is equipped with the first flapper door 11 that can be swung, the first flapper door 11 in the gas inlet of the first reaction warehouse 5
Both ends be respectively the first connecting pin 111 and the first swinging end 112, the first connecting pin 111 and the first heat-conducting plate 7 is hinged or pivot
It connects so that the first flapper door 11 can be with the first connecting pin 111 for axis reciprocally swinging, and the first flapper door 11 is in pendulum
Just the top that the 2nd SCR reaction zones 62 are covered in when width both ends (includes but not limited to live with the first of adjacent reaction member
The case where dynamic baffle mutually overlaps) or to be covered on the smoke inlet of the first reaction warehouse 5 (include but not limited to be overlapped on reactor
The case where mutually being overlapped on the inner wall of main body 2 and with the first flapper of adjacent reaction member) so that first reaction
The top air inlet of the gas inlet in storehouse 7 and the 2nd SCR reaction zones 62 is handed over by the reciprocally swinging of the first flapper door 11
For keying, enter or do not enter the first reaction warehouse 5 to control flue gas.To realize that the first smoke reaction channel and the second flue gas are anti-
The effect for answering channel alternate conduction to close.As shown in Figure 1, in the present embodiment, the first flapper door 11 is reacted with adjacent
First flapper of unit mutually overlaps and is covered in the top of the corresponding 2nd SCR reaction zones.
The the second flapper door 12 that can be swung, 12 both ends of the second flapper door point are equipped in diversion elbow 9
Not Wei second connection end 121 and the second swinging end 122, what the second connection end 121 and 9 inner wall of the diversion elbow can rotate
It is connected, the second swinging end 122 can be overlapped on 8 lower end of the second heat-conducting plate or be plugged on the inner wall of diversion elbow 9 so that described
Diversion elbow 9 is opened and closed by the reciprocally swinging of the second flapper door 12, is entered with closed first reaction warehouse 5 and control flue gas
Or do not enter the first SCR reaction zones 61.
Under 12 collective effect of the first flapper door 11 and the second flapper door, when the first flapper door 11
It closes the gas inlet of first reaction warehouse 5 and opens the top of the 2nd SCR reaction zones 62, and second active catch
When plate door 12 closes the diversion elbow 9, the flue gas main entrance 1, the 2nd SCR reaction zones 62, the 3rd SCR reactions
Area 63 and the flue gas general export 3 be sequentially communicated to be formed allow flue gas by the second smoke reaction channel, reaching makes CO be catalyzed
The effect of zoneofoxidation short circuit.
As shown in Figure 1, Figure 3, mounting guiding board 13 and arrangement grid 14 in the smoke inlet 1, so that flue gas can be equal
It is anti-(when CO catalytic oxidations need to be carried out) or into SCR in even entrance CO catalysis oxidations area (the first reaction warehouse 5)
It answers in area's (the second reaction warehouse 6) (when without carrying out CO catalytic oxidations).
Further, in the second pendulum of the first swinging end 112 of the first flapper door 11 and the second flapper door 12
Flexible sealing strip 10 is mounted on moved end 122.Using which, leakage of the flue gas between differential responses area can be reduced.Institute
State flexible sealing strip be existing product, in some embodiments, the flexible sealing strip 10 be all steel flexible sealing strip,
Fluoroether rubber flexible sealing strip, flexible sealing strip fluorubber or polytetrafluoroethylene (PTFE) flexible sealing strip.Preferably polytetrafluoroethylene is flexible
Sealing strip.
Further, the first heat-conducting plate 7 and the second heat-conducting plate 8 are mild steel heat-conducting plate, low-alloy steel heat-conducting plate or metal
Plate enamel heat-conducting plate.It is preferred that metal-plated enamel heat-conducting plate.
The multi-functional catalytic reactor of the present invention is when in use：
State shown in FIG. 1 is applicable to following example 1, (the upstream work of example 2 of the operating mode using CO catalysis oxidations area
When skill flue-gas temperature is unable to reach SCR reaction required temperatures, hot-blast stove needs work), it is mounted in reactor body 2 described
The first flapper door 11 on first heat-conducting plate 7 mutually overlaps two-by-two, so that flue gas initially enters CO catalysis oxidations area,
Without initially entering the SCR reaction zones, the second flapper door 12 mounted on 9 end of the diversion elbow is overlapped on described
The bottom end of second heat-conducting plate 8 so that into CO reaction zones react after flue gas enter the first SCR reaction zones 61, then according to
The secondary flue gas by the 2nd SCR reaction zones 62, the 3rd SCR reaction zones 63, being discharged from the 3rd SCR reaction zones 63 converge after from described
Flue gas general export 3 is discharged.
State shown in Fig. 3 is suitable for use following example 3 (the process upstream cigarette of the operating mode of the oxidation reaction zones CO
When temperature degree can reach SCR reaction required temperatures, hot-blast stove does not need work), state that can be as shown in Figure 1 changes to obtain,
9 end of direction and diversion elbow for the first flapper door 11 that change is arranged on first heat-conducting plate 7 can be passed through
Second flapper door, 12 direction obtains the reactor of the state.
Specifically, being located at the first flapper door in reactor on the heat-conducting plate 7 of first piece first of the leftmost side in figure 3
11 are overlapped on reactor wall with the CO catalysis oxidations area of the closed leftmost side, second piece of first heat-conducting plate and the first heat conduction of third block
The first flapper door 11 mutually overlap joint of plate, to open left side SCR reaction zones, while closed intermediate CO catalysis oxidations area, the
The first flapper door 11 mutually overlap joint of four piece of first heat-conducting plate and the 5th piece of the first heat-conducting plate, with open intermediate and right side
SCR reaction zones, while closed right side CO catalysis oxidations area；And be arranged in respective back bending in left side, centre, right side reaction member
Second flapper door 12 is respectively overlapped on the first heat-conducting plate 7 vacantly in the diversion elbow 9, described in bottom end closure
CO catalysis oxidations area, the open SCR region, the first exhaust gases passes closing in the reactor, the second exhaust gases passes are led at this time
Logical, whole CO catalysis oxidations area short circuit, flue gas cannot be introduced into the area, and flue gas is directly entered the SCR reaction zones, from this after reaction
Area is discharged.
Example 1
Under certain operating mode, flue gas temperature~170 DEG C before entering hot-blast stove, by being~230 DEG C after hot-blast stove, cigarette
CO contents are~6500ppm, NO in gasxFor~300mg/Nm3, exhaust gas volumn is~110000Nm3/h.The present embodiment uses such as Fig. 1
The multi-functional catalytic reactor of shown state has 3 repetition reaction members in the reactor.
Reactor under the state, CO catalysis oxidations area is in running order, and the movable end of baffle door installs polytetrafluoroethyl-ne
Alkene flexible sealing strip, to reduce leakage of the flue gas between differential responses area；
Flue gas is introduced by CO catalysis oxidations area 211, CO catalysis oxidations area 211 is reacted with the 3rd SCR
The first heat-conducting plate between area 2123 and the first SCR reaction zones, the first SCR reaction zones are reacted with the 2nd SCR
The second heat-conducting plate between area selects plating enamel carbon steel, and flue gas smoke temperature behind CO catalysis oxidations area 211 rises to~
245 DEG C, flue gas goes successively to the SCR reaction zones 212, i.e., passes through the first SCR reaction zones 2121, the 3rd SCR reaction zones successively
2123 and the 2nd after SCR reaction zones 2122, complete denitrification process, and CO content in smoke is down to 100ppm hereinafter, NO at this timexContent
50mg/Nm can be down to3Below.
Example 2
Under another operating mode, flue gas temperature~170 DEG C before entering hot-blast stove, by being~290 DEG C after hot-blast stove,
CO content in smoke is~3200ppm, NOxFor~300mg/Nm3, exhaust gas volumn is~110000Nm3/h.The present embodiment is using such as
The multi-functional catalytic reactor of state shown in Fig. 1 has 3 repetition reaction members in the reactor.
Reactor under the state, CO catalysis oxidations area is in running order, and the movable end installation fluorubber of baffle door is soft
Property sealing strip, to reduce leakage of the flue gas between differential responses area；
It introduces flue gas and passes through CO catalysis oxidations area, CO catalysis oxidations area and the 2nd SCR reaction zones and institute
The first heat-conducting plate between the first SCR reaction zones is stated, between the first SCR reaction zones and the 2nd SCR reaction zones
Two heat-conducting plates select low-alloy steel, and flue gas smoke temperature behind CO catalysis oxidations area rises to~245 DEG C, flue gas continue into
Enter the SCR reaction zones, i.e., pass through the first SCR reaction zones successively, after the 2nd SCR reaction zones and the 3rd SCR reaction zones, completes de-
Nitre process, at this time CO content in smoke be down to 100ppm hereinafter, NOx content can be down to 15mg/Nm3Below.
Example 3
Under certain another operating mode, flue gas temperature~250 DEG C before entering hot-blast stove have reached denitrating catalyst work
Temperature requirement, CO content in smoke are~1000ppm, NOxFor~800mg/Nm3, exhaust gas volumn is~220000Nm3/h.This implementation
Example uses the multi-functional catalytic reactor of state shown in Fig. 3, has 3 repetition reaction members in the reactor.
Reactor under the state, CO catalysis oxidations area short-circuit condition, the movable end installation fluoroether rubber sealing of baffle door
Item reduces leakage of the flue gas between different catalysts storehouse；
It introduces flue gas to react by the SCR, CO catalysis oxidations area and the 3rd SCR reaction zones and described first
The first heat-conducting plate between SCR reaction zones, the second heat conduction between the first SCR reaction zones and the 2nd SCR reaction zones
Plate selects mild steel, completes denitrification process, NOxContent can be down to 150mg/Nm3Below.
The present invention is a large amount of not sufficiently combusted in view of steel industry flue gas is produced during being reheated using hot-blast stove
CO, while the technical issues of need SCR denitration, by CO catalysis oxidations and SCR denitration reaction coupling integration in a reactor,
CO oxidations are reacted with SCR denitration and are integrated into a reactor by subregion cascade, which can be according to actual condition
Demand adjust to the relative size of the oxidation reaction zones CO and SCR denitration reaction zone, modularized design is conveniently adjusted implementation.
In addition, using CO catalysis oxidations area and SCR denitration reaction zone is arranged side by side and heat-conducting plate is connected and used by back bending
Mode can make the heat that CO oxidations are released to flue gas, be conducive to SCR reactions and carry out, improve capacity usage ratio, reduce cigarette
The operating cost that gas reheats.
The short circuit of the oxidation reaction zones CO, this set can be adapted in production by the design of the flapper door of the present invention
Different working conditions, when process upstream flue-gas temperature, which reaches SCR, reacts required temperature, hot-blast stove no longer works, at this time then
The oxidation reaction zones CO need not be used, CO reaction zones can be closed by adjusting baffle door, CO oxidation catalysts is saved and uses the longevity
Life.
In addition, the first SCR reaction zones or the 3rd SCR reaction zones of the present invention replace with VOCs catalysis oxidations area or two
Evil English catalysis oxidations area.Above-mentioned VOCs catalysis oxidations area loads VOCs oxidation catalysts, such catalyst is existing catalyst, on
Shu bioxin catalysis oxidations area loads bioxin oxidation catalyst, such catalyst is existing catalyst.Due to this pollutant
Catalytic reaction temperature section reacts close with SCR denitration, can be placed according to process requirements before and after SCR processes.
On the other hand, the multi-functional catalytic reactor that present invention offer CO catalysis oxidations are coupled with SCR denitration is in
Application in high temperature SCR reaction purifying smokes.
Preferably, the flue gas is the sintering flue gas or coking flue gas containing CO or without containing CO.It is highly preferred that described contain
CO and NOxSintering flue gas or coking flue gas be mixture combustion pair using blast furnace gas or blast furnace gas and coke-stove gas
What flue gas generated after being preheated.
What is finally illustrated is：Above example is merely to illustrate the implementation process and feature of the present invention, and unrestricted is sent out
Bright technical solution, although the present invention has been described in detail with reference to the above embodiments, those skilled in the art answer
Work as understanding：It is still possible to modify or equivalently replace the present invention, without departing from the spirit and scope of the present invention any
Modification or part are replaced, and should all be covered in protection scope of the present invention.
Claims (10)
1. a kind of multi-functional catalytic reactor that CO catalysis oxidations are coupled with SCR denitration is wrapped successively by the flow direction of flue gas
Include flue gas main entrance, reactor body and flue gas general export；
Include at least one reaction member inside the reactor body, each reaction member includes the placement being arranged in series
First reaction warehouse of CO oxidation reaction catalysts and the second reaction warehouse for placing SCR catalysts, the first reaction warehouse tool
There are the gas inlet that can be connected to the flue gas main entrance, second reaction warehouse that there is the cigarette being connected to the flue gas general export
Gas exports, and first reaction warehouse is arranged side by side with second reaction warehouse and is separated with the first heat-conducting plate, and described first
Reaction warehouse and second reaction warehouse be connected with each other it is logical formed allow flue gas by the first smoke reaction channel.
2. the multi-functional catalytic reactor that CO catalysis oxidations according to claim 1 are coupled with SCR denitration, feature exist
In, second reaction warehouse by be disposed therein the transverse slat of lower part be divided into stringer board the first SCR reaction zones being sequentially connected to,
2nd SCR reaction zones and the 3rd SCR reaction zones, the stringer board are the second heat-conducting plate, the first SCR reaction zones and the third
SCR reaction zones are arranged side by side and are separated with second heat-conducting plate, and it is anti-that the 2nd SCR reaction zones are located at the first SCR
The top in area and the 3rd SCR reaction zones, the first SCR reaction zones is answered to pass through diversion elbow and first reaction warehouse
Bottom is connected, the bottoms of the 2nd SCR reaction zones respectively with the first SCR reaction zones and the 3rd SCR reaction zones
It is connected, the top of the 2nd SCR reaction zones is opened towards flue gas main entrance direction；
It is equipped with the first flapper door that can be swung, the flue gas of first reaction warehouse in the gas inlet of first reaction warehouse
The top of import and the 2nd SCR reaction zones is alternately opened and closed by the reciprocally swinging of the first flapper door；It is described
The the second flapper door that can be swung is equipped in diversion elbow, the diversion elbow is reciprocal by the second flapper door
It swings and opens and closes；
When the first flapper door closes the gas inlet of first reaction warehouse and opens the 2nd SCR reaction zones
Top, and the second flapper door close the diversion elbow when, the flue gas main entrance, the 2nd SCR reaction zones,
The 3rd SCR reaction zones and the flue gas general export be sequentially communicated to be formed allow flue gas by the second smoke reaction channel.
3. the multi-functional catalytic reactor that CO catalysis oxidations according to claim 2 are coupled with SCR denitration, feature exist
In the both ends of the first flapper door are respectively the first connecting pin and the first swinging end, and first connecting pin can rotate
Connect with first heat-conducting plate upper end, first swinging end can be covered in top or the envelope of the 2nd SCR reaction zones
It is placed on the smoke inlet of first reaction warehouse；The second flapper door both ends are respectively second connection end and the second pendulum
Moved end, the second connection end are connected with what the diversion elbow inner wall can rotate, and second swinging end can be overlapped on institute
It states the second heat-conducting plate lower end or is plugged on the diversion elbow.
4. the multi-functional catalytic reactor that CO catalysis oxidations according to claim 3 are coupled with SCR denitration, feature exist
In the reaction member is laid with two or more side by side, and the first flapper Men Nengyu of each reaction member is adjacent
First flapper of reaction member mutually overlaps and is covered in the top of the corresponding 2nd SCR reaction zones or is covered in institute
On the smoke inlet for stating the first reaction warehouse.
5. the multi-functional catalytic reactor that CO catalysis oxidations according to claim 4 are coupled with SCR denitration, feature exist
In being mounted on flexible sealing strip on first swinging end and second swinging end.
6. the multi-functional catalytic reactor that CO catalysis oxidations according to claim 5 are coupled with SCR denitration, feature exist
In the flexible sealing strip is all steel flexible sealing strip, fluoroether rubber flexible sealing strip, flexible sealing strip fluorubber or poly-
Tetrafluoroethene flexible sealing strip.
7. CO catalysis oxidations according to any one of claim 1 to 6 are reacted with the multi-functional catalysis that SCR denitration couples
Device, which is characterized in that be equipped with deflector at the flue gas main entrance and/or arrange grid.
8. the CO catalysis oxidations according to any one of claim 2 to 6 are reacted with the multi-functional catalysis that SCR denitration couples
Device, which is characterized in that first heat-conducting plate and second heat-conducting plate are mild steel heat-conducting plate, low-alloy steel heat-conducting plate or gold
Belong to plating enamel heat-conducting plate.
9. reacting smoke-purifying by high temperature SCR according to multi-functional catalytic reactor according to any one of claims 1 to 8
Application in gas.
10. application according to claim 9, wherein the flue gas is containing CO or the sintering flue gas without containing CO or coke
Change flue gas；
Preferably, the sintering flue gas containing CO or coking flue gas are using blast furnace gas or blast furnace gas and coke-stove gas
Mixture combustion flue gas is preheated after generate.
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| CN112691529A (en) * | 2020-12-26 | 2021-04-23 | 曾艳芝 | Oxidation furnace convenient for fully reacting industrial waste gas low-valence oxides |
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| CN108310972B (en) | 2023-01-31 |
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