CN107596916A - Flue gas rotation remittance coupling even distribution device and the equipment and method of work for installing the device - Google Patents
Flue gas rotation remittance coupling even distribution device and the equipment and method of work for installing the device Download PDFInfo
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- CN107596916A CN107596916A CN201710883767.7A CN201710883767A CN107596916A CN 107596916 A CN107596916 A CN 107596916A CN 201710883767 A CN201710883767 A CN 201710883767A CN 107596916 A CN107596916 A CN 107596916A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 139
- 239000003546 flue gas Substances 0.000 title claims abstract description 139
- 238000009826 distribution Methods 0.000 title claims abstract description 71
- 230000008878 coupling Effects 0.000 title claims abstract description 57
- 238000010168 coupling process Methods 0.000 title claims abstract description 57
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000003054 catalyst Substances 0.000 claims abstract description 40
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 50
- 239000007789 gas Substances 0.000 claims description 27
- 229910021529 ammonia Inorganic materials 0.000 claims description 25
- 230000000694 effects Effects 0.000 claims description 17
- 239000007921 spray Substances 0.000 claims description 16
- 206010022000 influenza Diseases 0.000 claims description 13
- 229910000069 nitrogen hydride Inorganic materials 0.000 claims description 9
- 230000033001 locomotion Effects 0.000 claims description 7
- 235000019504 cigarettes Nutrition 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 238000006555 catalytic reaction Methods 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 abstract description 2
- 230000003628 erosive effect Effects 0.000 abstract description 2
- 238000013517 stratification Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Remittance coupling even distribution device is revolved the present invention relates to a kind of flue gas and the equipment and method of work of the device are installed, including flat board and multiple circular through flow holes, all circular through flow holes are arranged on flat board, guide vane group is provided with each circular through flow hole, guide vane group includes multiple guide vanes, guide vane on same circular through flow hole arranges along spiral-flow type clockwise or counter-clockwise, circular through flow hole is provided centrally with imaginary circle, imaginary circle is poroid, one end of guide vane is arranged on the edge of the circular through flow hole where the guide vane, the other end is at the edge of the imaginary circle of the circular through flow hole where the guide vane.Revolve to converge by using flue gas and couple even distribution device, the flue gas into SCR denitration reactor is set to be reallocated, uniformity of the flue gas in SCR denitration reactor can be significantly improved, flue gas flow rate height is effectively improved to the erosive wear of catalyst and the catalyst dust stratification situation in low flue gas flow rate region, extends the service life of catalyst.
Description
Technical field
Remittance coupling even distribution device is revolved the present invention relates to a kind of flue gas and the equipment and method of work of the device are installed.
Background technology
At present, SCR flue-gas denitration process due to it is high with simple in construction, denitration efficiency and in denitrification process produced by
Accessory substance the advantages that will not forming secondary pollution, used by China's overwhelming majority Thermal generation unit.But due to SCR
Denitrification apparatus reactor inlet flue gas flow field is complicated and changeable, NOXConcentration distribution is uneven, and the flue gas into inside reactor is local
Ammonia nitrogen mol ratio relative deviation is larger, causes denitration efficiency low.Especially under the background of minimum discharge transformation, denitration outlet
NOXConcentration controls 50mg/m3Even lower, reducing agent consumption and the escaping of ammonia consumption can not be effectively ensured.Simultaneously as
Reactor inlet deflector effect is limited, and it is larger to cause entry into the flue gas flow rate deviation of the superiors' catalyst, local flue gas flow rate
The excessive abrasion for causing catalyst, and the situation deposition of flue dust then occurs in the too low region of flue gas flow rate, so as to seriously make
Into catalyst blockage, catalyst inactivation has all been further exacerbated by.
It is longer and mixed to there is incorporation time due to the design feature of itself in existing SCR denitration system airflow uniform distribution device
Close the shortcomings of ineffective.Therefore need to be improved existing design, invent a kind of new airflow uniform distribution device, can
Improve ammonia and NOx mixed effect, while easy to install and energy-conservation.
The content of the invention
It is an object of the invention to overcome above shortcomings in the prior art, and offer is a kind of reasonable in design,
Reduce existing SCR denitration reactor inlet flue gas flow rate deviation, improve NO in reactorXWith NH3The flue gas of the uniformity coefficient of mixing
Rotation remittance coupling even distribution device and the equipment and method of work for installing the device.The present invention can not only improve SCR denitration reactor
Interior NOXWith NH3The uniformity coefficient of mixing, and the flue gas in SCR denitration reactor can be will go into and carry out secondary distribution, subtract
The too high situation of local flue gas flow rate on light catalyst section, extend the service life of catalyst, avoid too high flue gas flow rate pair
The local scour of catalyst, while ammonia and NO can be promotedXHybrid reaction.
Technical scheme is used by the present invention solves the above problems：A kind of flue gas rotation, which converges, couples even distribution device, its feature
It is：Including flat board and multiple circular through flow holes, all circular through flow holes are arranged on flat board, on each circular through flow hole
It is provided with guide vane group, guide vane group includes multiple guide vanes, the guide vane edge on same circular through flow hole
Spiral-flow type is arranged clockwise or counter-clockwise, and guide vane tilting is arranged on flat board, and circular through flow hole is shaped as circle,
Circular through flow hole is provided centrally with imaginary circle, and imaginary circle is poroid, and one end of guide vane is arranged on the guide vane institute
Circular through flow hole edge, the other end is at the edge of the imaginary circle of the circular through flow hole where the guide vane.Flue gas revolves
The coupling even distribution device that converges leads to according to the circle of the flue gas flow field situation setting area of the entrance of SCR denitration reactor, quantity not etc.
Discharge orifice, to reach the purpose for adjusting local flue gas flow rate.The guideline that circular through flow hole is set is uniform for flue gas rotation remittance coupling
Device is small in the effective flow area in the high region of flue gas flow rate, and flue gas rotation remittance coupling even distribution device has in the low region of flue gas flow rate
Effect flow area is big, to reach the purpose of regulation flue gas uniformity.Aperture is different between circular through flow hole, and different is circular through-flow
The quantity of the guide vane set on hole differs.
The angle of guide vane of the present invention and circular through flow hole is 45 ° -75 °.To guide vane and circular through flow hole
Angle suitably chosen, it can be ensured that flue gas rotation, which converges coupling even distribution device, has the function that eddy flow flue gas, can not only be
Ensure to greatest extent to strengthen on the basis of certain flow area the mixed effect of flue gas, and while eddy flow effect is taken into account
Flue gas is revolved and converges the flue gas resistance damage control caused by coupling even distribution device in minimum.Water conservancy diversion in same circular through flow hole
Blade is uniformly distributed, and guide vane length is less than the radius of circular through flow hole, all guide vanes in same circular through flow hole
Length is identical and presses same angle eddy flow in the same direction in circular through flow hole, and an imagination is formed in circular through flow hole
Circle, flue gas can be from the imaginary circle among circular through flow hole directly by the way that without being influenceed by eddy flow, the radius of imaginary circle is by circle
The radius and guide vane length of through flow hole are determined.
The spiral-flow type orientation of guide vane on the two neighboring circular through flow hole of the present invention is opposite.Feature is tried one's best herein
Reach, it is not necessary to strict to meet.
The projected area of circular through flow hole of the guide vane group of the present invention where it is less than the circular through flow hole
The 10% of cross-sectional area, both ensured that flue gas is flowed through into flue gas rotation converged drag losses control caused by coupling even distribution device in minimum,
The mixed effect after flue gas eddy flow is in turn ensure that.
A kind of equipment for being provided with flue gas rotation remittance coupling even distribution device, it is characterised in that：Set successively along flow of flue gas direction
Put boiler, spray ammonia grid, fairing, deflector, flue gas rotation remittance coupling even distribution device, catalyst layer and air preheater, pot
Stove is communicated with flue, sprays ammonia grid and fairing is arranged in flue, the entrance of flue connects with boiler, and flue goes out
Mouth connects with the entrance of SCR denitration reactor, and deflector, flue gas rotation remittance coupling even distribution device and catalyst layer are installed in SCR
In Benitration reactor, air preheater is led in the outlet of SCR denitration reactor, and deflector is arranged on SCR denitration reactor
Entrance, the quantity of catalyst layer is multilayer, and all catalyst layers are arranged on flue gas along flow of flue gas direction successively layered distribution and revolved
Converge between coupling even distribution device and air preheater, the catalyst layer along flow of flue gas direction first with smoke contacts is urged for the first floor
Agent layer, flue gas rotation remittance coupling even distribution device are arranged between deflector and first floor catalyst layer.Flue gas rotation, which converges with coupling, to be arranged
Put and be connected with the inwall of SCR denitration reactor.
The minimum spacing that flue gas rotation of the present invention converges between coupling even distribution device and first floor catalyst layer is 1.5m.Full
Sufficient flue gas mixing is easily installed maintenance while requirement.
Through support beam is provided with SCR denitration reactor of the present invention, flue gas rotation remittance coupling even distribution device passes through branch
Beam is supportted to be arranged in SCR denitration reactor.
Effective flow area summation of all circular through flow holes of the present invention is not less than the 85% of the sectional area of flue, herein cigarette
The area in section after plane is cut by SCR denitration reactor where the sectional area in road refers to flat board.Both after having ensure that flue gas eddy flow
Mixed effect, and flue gas flowed through into flue gas rotation converge drag losses control caused by coupling even distribution device and in minimum, reduce wind
Machine energy loss.
Economizer is provided between boiler of the present invention and spray ammonia grid, flue includes No.1 horizontal flue, rises cigarette
Road and No. two horizontal flues, lead to the entrance of No.1 horizontal flue for the outlet of economizer, the outlet and rising of No.1 horizontal flue
The entrance connection of flue, the outlet of uptake flue connects with the entrance of No. two horizontal flues, the outlet of No. two horizontal flues and SCR
The entrance connection of Benitration reactor, No.1 horizontal flue and No. two horizontal flues are horizontally disposed, and uptake flue and SCR denitration are anti-
Device is answered to be vertically arranged, spray ammonia grid is arranged in No.1 horizontal flue, and fairing is arranged in uptake flue.
A kind of method of work for the equipment for being provided with flue gas rotation remittance coupling even distribution device, it is characterised in that：Including following step
Suddenly：Caused flue gas goes to economizer after fired coal combustion in boiler, then exits to the horizontal cigarette of No.1 from the outlet of economizer
Road, ammonia and air spray into No.1 horizontal flue by spray ammonia grid, and ammonia and air are mixed to form in No.1 horizontal flue with flue gas
Mixed gas, mixed gas are moved upwards subsequently into uptake flue, enter No. two horizontal flues by the rectification of fairing,
Moved downward in the presence of deflector, go to flue gas rotation to converge and couple even distribution device；
NO in mixed gasXWith NH3When coupling even distribution device by flue gas rotation remittance along the central axial direction of circular through flow hole,
Part mixed gas produces clockwise or counterclockwise in the presence of guide vane around the central axis of circular through flow hole
Motion, central axial direction of remaining mixed gas along circular through flow hole flow out from imaginary circle, improve mixed gas in SCR
Uniformity in Benitration reactor, while also generate along circular through flow hole central axis, turn clockwise and rotate counterclockwise
Three kinds of traffic directions, the NO in mixed gasXWith NH3It is sufficiently mixed under the collective effect of eddy flow and turbulent flow；
Last mixed gas goes to air preheater by the catalytic reaction of catalyst layer.Motion production clockwise or counterclockwise
Raw eddy flow, central axial direction of the flue gas along circular through flow hole move turbulization.
The present invention revolves remittance coupling even distribution device compared with prior art, by using flue gas, makes into SCR denitration reactor
Flue gas is reallocated, and can significantly improve uniformity of the flue gas in SCR denitration reactor, is effectively improved flue gas flow rate height to urging
The erosive wear of agent and the catalyst dust stratification situation in low flue gas flow rate region, extend the service life of catalyst.Flue gas
After revolving remittance coupling even distribution device by flue gas, the full and uniform mixing under the collective effect of eddy flow turbulent flow, first floor catalyst is improved
NO in the flue gas of layer porchXConcentration and the uniformity of ammonia nitrogen mol ratio distribution, improve denitration efficiency, reduce the escaping of ammonia and reducing agent
Consumption.Flue gas rotation of the present invention, which converges, couples even distribution device, occupies little space, is easy to processing and installation, without power, system pressure drop
It is small, suitable for the SCR flue gas denitrification systems of prior art.
Brief description of the drawings
Fig. 1 is the main structure diagram of the embodiment of the present invention.
Fig. 2 is the flue gas rotation remittance coupling even distribution device main structure diagram of the embodiment of the present invention.
Fig. 3 is the circular through flow hole main structure diagram of the embodiment of the present invention.
Fig. 4 is location diagram of the guide vane with circular through flow hole of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and the present invention is described in further detail by embodiment, and following examples are to this hair
Bright explanation and the invention is not limited in following examples.
Embodiment.
Referring to Fig. 1-4.
The present embodiment is that a kind of rotation remittance of flue gas couples even distribution device 5, including flat board 51 and multiple circular through flow holes 52, is owned
Circular through flow hole 52 is arranged on flat board 51.
Guide vane group is provided with each circular through flow hole 52, guide vane group includes multiple guide vanes 53,
Guide vane 53 on same circular through flow hole 52 arranges along spiral-flow type clockwise or counter-clockwise.In the present embodiment, flat board
There is the circular through flow hole 52 for the guide vane 53 for being provided with the arrangement of dextrorotation streaming simultaneously on 51, and be provided with counterclockwise
The circular through flow hole 52 of the guide vane 53 of spiral-flow type arrangement.Projected position of the guide vane 53 on flat board 51 is circulation flue gas
Opening.Flue gas generates clockwise rotation in the case of revolving remittance coupling even distribution device 5 by flue gas via guide vane 53
Stream and eddy flow counterclockwise.
The tilting of guide vane 53 is arranged on flat board 51.Tilting the implication installed is：Guide vane 53 is strip
Sheet, the side of guide vane 53 along its length be fitted on flat board 51, and guide vane 53 is along its length
Another side opposing plates 51 tilt.
Preferably, the inclined angle β of guide vane 53 and circular through flow hole 52 is 45 ° -75 °.To guide vane 53
Suitably chosen with the angle of circular through flow hole 52, it can be ensured that flue gas rotation remittance coupling even distribution device 5 has eddy flow flue gas
Effect, the mixed effect of flue gas can not only be strengthened to greatest extent on the basis of certain flow area is ensured, and simultaneous
Flue gas rotation converges the drag losses control for coupling even distribution device 5 in minimum while Gu Xuanliu effects.
Circular through flow hole 52 is shaped as circle, and circular through flow hole 52 is provided centrally with imaginary circle 54, and imaginary circle 54 is
Poroid, one end of guide vane 53 is arranged on the edge of the circular through flow hole 52 at the place of guide vane 53, and the other end is at this
The edge of the imaginary circle 54 of circular through flow hole 52 where guide vane 53, the length of guide vane 53 are less than circular through flow hole 52
Radius.The line in the center of circle of the one end and circular through flow hole 52 of guide vane 53 on the edge of imaginary circle 54, and water conservancy diversion leaf
One side of piece 53, the angle that the two lines are formed is α.Flue gas is revolved to converge by imaginary circle 54 by flue gas couples even distribution device 5
In the case of i.e. generate turbulent flow.
Preferably, the guide vane 53 on same circular through flow hole 52 is uniformly distributed, same circular through flow hole
All length of guide vane 53 are identical in 52 and press same angle eddy flow in the same direction in circular through flow hole 52.That is, it is same
All guide vanes 53 in individual circular through flow hole 52 are identical between each other, and guide vane 53 is with the circle of circular through flow hole 52
Centered on the heart, annular array is arranged on circular through flow hole 52.
Flue gas rotation converge coupling even distribution device 5 according to the flue gas flow field situation setting area of the entrance of SCR denitration reactor 7,
The circular through flow hole 52 that quantity does not wait, to reach the purpose for adjusting local flue gas flow rate.The guidance of circular through flow hole 52 respectively is former
It is then that flue gas rotation remittance coupling even distribution device 5 is small in the effective flow area in the high region of flue gas flow rate, flue gas rotation remittance coupling arranges
Put it is 5 big in the effective flow area in the low region of flue gas flow rate, to reach the purpose of regulation flue gas uniformity.Circular through flow hole 52 it
Between aperture it is different, the quantity of the guide vane 53 set on different circular through flow holes 52 differs.Flue gas can be through-flow from circle
Imaginary circle 54 among hole 52 directly by without being influenceed by eddy flow, the radius of imaginary circle 54 by circular through flow hole 52 radius and
The length of guide vane 53 is determined.
Preferably, the spiral-flow type orientation of the guide vane 53 on two neighboring circular through flow hole 52 is on the contrary, for example
The eddy flow direction of guide vane 53 on one circular through flow hole 52 is clockwise, the water conservancy diversion leaf on its adjacent circular through flow hole 52
The eddy flow direction of piece 53 is counterclockwise.Feature reaches as far as possible herein, it is not necessary to strict to meet.
The projected area of circular through flow hole 52 of the guide vane group where it is less than the cross section of the circular through flow hole 52
Long-pending 10%.This feature both ensured by flue gas flow through flue gas rotation converge coupling even distribution device 5 caused by drag losses be reduced to most
It is small, the mixed effect after flue gas eddy flow has been taken into account again.
The present embodiment additionally provides the equipment for being provided with flue gas rotation remittance coupling even distribution device 5, along flow of flue gas direction successively
Set boiler 1, spray ammonia grid 2, fairing 3, deflector 4, flue gas rotation remittance coupling even distribution device 5, catalyst layer 8 and air pre-
Hot device 9.
Boiler 1 is communicated with flue, and the entrance of flue connects with boiler 1, the outlet of flue and entering for SCR denitration reactor 7
Mouth connection, air preheater 9 is led in the outlet of SCR denitration reactor 7.
Specifically, flue includes No.1 horizontal flue, uptake flue and No. two horizontal flues.The outlet of economizer leads to one
The entrance of number horizontal flue, the outlet of No.1 horizontal flue connect with the entrance of uptake flue, the outlet of uptake flue and No. two
The entrance connection of horizontal flue, the outlet of No. two horizontal flues connects with the entrance of SCR denitration reactor 7.No.1 horizontal flue
Horizontally disposed with No. two horizontal flues, uptake flue and SCR denitration reactor 7 are vertically arranged.No.1 horizontal flue and upper
90 ° of elbow bends are provided between liter flue.The entrance of uptake flue is in the bottom of uptake flue, and the outlet of uptake flue is upper
Rise the top of flue.The entrance of SCR denitration reactor 7 is located at the top of SCR denitration reactor 7, and SCR denitration reactor 7 goes out
Mouth is located at the bottom of SCR denitration reactor 7.
Spray ammonia grid 2 is arranged in No.1 horizontal flue, and fairing 3 is arranged in uptake flue, and flue gas rotation, which converges, to be coupled
Even distribution device 5, catalyst layer 8 and support beam 6 are installed in SCR denitration reactor 7.The quantity of catalyst layer 8 is multilayer, institute
There is catalyst layer 8 to be arranged on flue gas rotation remittance coupling even distribution device 5 and air preheater 9 along flow of flue gas direction successively layered distribution
Between.First with the catalyst layer 8 of smoke contacts it is first floor catalyst layer along flow of flue gas direction.
In the present embodiment, flue gas is moved from top to bottom in downward-flow flue, and therefore, height highest is urged in downward-flow flue
Agent layer 8 is first floor catalyst layer.
Deflector 4, flue gas rotation remittance coupling even distribution device 5 and catalyst layer 8 are installed in SCR denitration reactor 7, water conservancy diversion
Plate 4 is arranged on the entrance of SCR denitration reactor 7, and flue gas rotation remittance coupling even distribution device 5 is arranged on deflector 4 and first floor catalyst
Between layer 8.Flue gas rotation remittance coupling even distribution device 5 is connected by flat board 51 with the inwall of SCR denitration reactor 7.
Preferably, the minimum spacing that flue gas rotation converges between coupling even distribution device 5 and first floor catalyst layer is 1.5m, full
Sufficient flue gas mixing is easily installed maintenance while requirement.
Preferably, flue gas rotation remittance coupling even distribution device 5 is single layer structure, runs through in SCR denitration reactor 7 and branch is installed
Beam 6 is supportted, flue gas rotation remittance coupling even distribution device 5 is arranged in SCR denitration reactor 7 by support beam 6.
Effective flow area summation of all circular through flow holes 52 both ensure that cigarette not less than the 85% of the sectional area of flue
Mixed effect after cyclonic current, and flue gas is flowed through into flue gas rotation and converges drag losses control caused by coupling even distribution device 5 most
It is small, reduce blower fan energy loss.The sectional area of flue refers to and cut after the place plane of flat board 51 is cut by SCR denitration reactor 7 herein
The area in face.Projected area of the sectional area of the valid circulation area=flue-all guide vanes 53 on circular through flow hole 52-
The area of not opening part on flat board 51.
Present embodiments provide the method for work for the equipment for being provided with flue gas rotation remittance coupling even distribution device 5, including following step
Suddenly：
Caused flue gas goes to economizer after fired coal combustion in boiler 1, then exits to No.1 level from the outlet of economizer
Flue, ammonia and air spray into No.1 horizontal flue, ammonia and air in No.1 horizontal flue by spray ammonia grid 2 and flue gas mixes shape
Into mixed gas, mixed gas is moved straight up subsequently into uptake flue, enters No. two water by the rectification of fairing 3
Flat flue, then moved downward in the presence of deflector 4 and go to flue gas rotation remittance coupling even distribution device 5.
Mixed gas（Including flue gas, air and ammonia）In NOXWith NH3Along the central axial direction of circular through flow hole 52
When revolving remittance coupling even distribution device 5 by flue gas, part mixed gas is in the presence of guide vane 53 around circular through flow hole 52
Central axis produce be rotated both clockwise and counterclockwise motion, central axial direction of remaining mixed gas along circular through flow hole 52
Flowed out from imaginary circle 54.Part mixed gas around circular through flow hole 52 central axis produce clockwise movement and around
The central axis of circular through flow hole 52 produces counterclockwise movement and produces eddy flow, center of remaining mixed gas along circular through flow hole 52
Axis direction flows out turbulization from imaginary circle 54.The mixed gas flowed out from imaginary circle 54 is not influenceed by eddy flow.
NO in mixed gasXWith NH3It is sufficiently mixed under the collective effect of eddy flow and turbulent flow, improves gaseous mixture
Uniformity of the body in SCR denitration reactor 7.
Last mixed gas goes to air preheater 9 by the catalytic reaction of catalyst layer 8.
The present embodiment mixed gas generates the central axis along circular through flow hole 52 under the guide functions of rotation remittance coupling
Motion, the central axis around circular through flow hole 52 turn clockwise, the central axis rotate counterclockwise three around circular through flow hole 52
Kind traffic direction, and great turbulence level effect is produced, make to carry NOXAnd there is NH3It is sufficiently mixed, not only increases the time of contact, greatly
It is big to improve denitration efficiency, and the distributing homogeneity of the exit NOx concentration of SCR denitration reactor 7 is effectively increased, reduce local
Higher ammonia slip concentration, so as to improve the safety in operation of denitrating system and economy.Flue gas after being sufficiently mixed is being catalyzed
Catalytic reduction reaction occurs for oxidant layer 8, and air preheater 9 of the neat stress after denitration through downstream discharges boiler.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of its parts and components, it is named
Title etc. can be different, and the above content described in this specification is only to structure example explanation of the present invention.It is all according to
The equivalence changes or simple change done according to the construction described in inventional idea of the present invention, feature and principle, are included in this hair
In the protection domain of bright patent.Those skilled in the art can do various to described specific embodiment
The modification of various kinds or supplement are substituted using similar mode, without departing from structure of the invention or surmount present claims
Scope defined in book, protection scope of the present invention all should be belonged to.
Claims (10)
1. a kind of flue gas rotation, which converges, couples even distribution device, it is characterised in that：It is all circular logical including flat board and multiple circular through flow holes
Discharge orifice is arranged on flat board, and guide vane group is provided with each circular through flow hole, and guide vane group includes multiple lead
Blade is flowed, the guide vane on same circular through flow hole arranges along spiral-flow type clockwise or counter-clockwise, and guide vane tilts
Formula is arranged on flat board, and circular through flow hole is shaped as circle, and circular through flow hole is provided centrally with imaginary circle, and imaginary circle is hole
Shape, one end of guide vane are arranged on the edge of the circular through flow hole where the guide vane, and the other end is in the guide vane
The edge of the imaginary circle of the circular through flow hole at place.
2. flue gas rotation according to claim 1, which converges, couples even distribution device, it is characterised in that：The guide vane leads to circle
The angle of discharge orifice is 45 ° -75 °.
3. flue gas rotation according to claim 1 or 2, which converges, couples even distribution device, it is characterised in that：Two neighboring circle is through-flow
The spiral-flow type orientation of guide vane on hole is opposite.
4. flue gas rotation according to claim 1 or 2, which converges, couples even distribution device, it is characterised in that：The guide vane group exists
The projected area of circular through flow hole where it is less than the 10% of the cross-sectional area of the circular through flow hole.
5. a kind of install the equipment converged just like the flue gas rotation described in claim 1-4 any claims and couple even distribution device, its
It is characterised by：Boiler, spray ammonia grid, fairing, deflector, flue gas rotation remittance coupling are set gradually along flow of flue gas direction uniformly
Device, catalyst layer and air preheater, boiler are communicated with flue, spray ammonia grid and fairing is arranged in flue, cigarette
The entrance in road connects with boiler, and the outlet of flue connects with the entrance of SCR denitration reactor, and deflector, flue gas rotation converge and coupled
Even distribution device and catalyst layer are installed in SCR denitration reactor, and air preheat is led in the outlet of SCR denitration reactor
Device, deflector are arranged on the entrance of SCR denitration reactor, and the quantity of catalyst layer is multilayer, and all catalyst layers are along flue gas stream
Layered distribution is arranged between flue gas rotation remittance coupling even distribution device and air preheater successively in dynamic direction, first along flow of flue gas direction
It is first first floor catalyst layer with the catalyst layer of smoke contacts, flue gas rotation remittance coupling even distribution device is arranged on deflector and the first floor is urged
Between agent layer.
6. the equipment according to claim 5 for being provided with flue gas rotation remittance coupling even distribution device, it is characterised in that：The flue gas
The minimum spacing that rotation converges between coupling even distribution device and first floor catalyst layer is 1.5m.
7. the equipment for being provided with flue gas rotation remittance coupling even distribution device according to claim 5 or 6, it is characterised in that：It is described
SCR denitration reactor is interior through support beam is provided with, and it is anti-installed in SCR denitration by support beam that flue gas rotation remittance couples even distribution device
Answer in device.
8. the equipment according to claim 7 for being provided with flue gas rotation remittance coupling even distribution device, it is characterised in that：All circles
Effective flow area summation of through flow hole is not less than the 85% of the sectional area of flue, and the sectional area of flue is put down where referring to flat board herein
The area in section after face is cut by SCR denitration reactor.
9. the equipment according to claim 7 for being provided with flue gas rotation remittance coupling even distribution device, it is characterised in that：The boiler
Economizer is provided between spray ammonia grid, flue includes No.1 horizontal flue, uptake flue and No. two horizontal flues, economizer
Outlet lead to the entrance of No.1 horizontal flue, the outlet of No.1 horizontal flue connects with the entrance of uptake flue, uptake flue
Outlet connected with the entrance of No. two horizontal flues, the outlet of No. two horizontal flues connects with the entrance of SCR denitration reactor, one
Number horizontal flue and No. two horizontal flues are horizontally disposed, and uptake flue and SCR denitration reactor are vertically arranged, and spray ammonia grid
It is arranged in No.1 horizontal flue, fairing is arranged in uptake flue.
10. a kind of equipment for being provided with flue gas and revolving remittance coupling even distribution device as described in claim 5-9 any claims
Method of work, it is characterised in that：Comprise the following steps：Caused flue gas goes to economizer, Ran Houcong after fired coal combustion in boiler
The outlet of economizer exits to No.1 horizontal flue, ammonia and air and sprays into No.1 horizontal flue, ammonia and air by spray ammonia grid
In No.1 horizontal flue and flue gas is mixed to form mixed gas, and mixed gas is moved upwards subsequently into uptake flue, passes through
The rectification of fairing enters No. two horizontal flues, is moved downward in the presence of deflector, goes to flue gas rotation to converge coupling uniformly
Device；
NO in mixed gasXWith NH3When coupling even distribution device by flue gas rotation remittance along the central axial direction of circular through flow hole,
Part mixed gas produces clockwise or counterclockwise in the presence of guide vane around the central axis of circular through flow hole
Motion, central axial direction of remaining mixed gas along circular through flow hole flow out from imaginary circle, improve mixed gas in SCR
Uniformity in Benitration reactor, while also generate along circular through flow hole central axis, turn clockwise and rotate counterclockwise
Three kinds of traffic directions, the NO in mixed gasXWith NH3It is sufficiently mixed under the collective effect of eddy flow and turbulent flow；
Last mixed gas goes to air preheater by the catalytic reaction of catalyst layer.
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| CN201710883767.7A CN107596916A (en) | 2017-09-26 | 2017-09-26 | Flue gas rotation remittance coupling even distribution device and the equipment and method of work for installing the device |
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| CN201710883767.7A CN107596916A (en) | 2017-09-26 | 2017-09-26 | Flue gas rotation remittance coupling even distribution device and the equipment and method of work for installing the device |
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Application publication date: 20180119 |