CN109499358A - Flue gas mixing heat riser and middle low temperature SCR denitration system - Google Patents
Flue gas mixing heat riser and middle low temperature SCR denitration system Download PDFInfo
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- CN109499358A CN109499358A CN201811598489.1A CN201811598489A CN109499358A CN 109499358 A CN109499358 A CN 109499358A CN 201811598489 A CN201811598489 A CN 201811598489A CN 109499358 A CN109499358 A CN 109499358A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 257
- 239000003546 flue gas Substances 0.000 title claims abstract description 257
- 238000002156 mixing Methods 0.000 title claims abstract description 85
- 239000007789 gas Substances 0.000 claims abstract description 66
- 230000000712 assembly Effects 0.000 claims abstract description 15
- 238000000429 assembly Methods 0.000 claims abstract description 15
- 230000008878 coupling Effects 0.000 claims abstract description 12
- 238000010168 coupling process Methods 0.000 claims abstract description 12
- 238000005859 coupling reaction Methods 0.000 claims abstract description 12
- 238000009434 installation Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000004744 fabric Substances 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000005245 sintering Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 235000019504 cigarettes Nutrition 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000000411 inducer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention discloses a kind of flue gas mixing heat riser and middle low temperature SCR denitration system, flue gas mixing heat riser includes: flue gas main pipe, gas approach and manifold assemblies；Wherein, manifold assemblies include: the coupling part being connected to flue gas main pipe, for being arranged in gas approach and gas approach being divided into netted division part in setting plane；Wherein, setting plane is perpendicular to the flue gas flow direction in gas approach, and coupling part and dividing partially is connected to, and division sets up separately and is equipped with venthole, and venthole is located in each mesh areas of gas approach.Flue gas mixing heat riser disclosed by the invention realizes denitration flue gas and the mixing of high-temperature flue gas subnetting porose area, effectively increases the uniformity of high-temperature flue gas and the mixing of denitration flue gas, improves the uniformity of flue-gas temperature, and then improve denitration efficiency；Meanwhile being mixed simultaneously in each mesh areas, improve mixing efficiency.
Description
Technical field
The present invention relates to denitration technology fields, more specifically to a kind of flue gas mixing heat riser and middle low-temperature SCR
Denitrating system.
Background technique
SCR (Selective Catalytic of the middle low temperature SCR denitration process distinction in running temperature at 320~420 DEG C
Reduction the incoming flow flue-gas temperature of) denitrating technique, middle low temperature SCR denitration technique is low, in order to guarantee 180~280 DEG C of operation
Temperature needs to promote running temperature by flue gas heat-exchange unit heat exchange and high-temperature flue gas Hybrid Heating, it is ensured that reaction temperature is steady
Fixed, mixed flue gas enters SCR denitration reaction device through gas approach.
Specifically, high-temperature flue gas Hybrid Heating is to carry out in flue gas mixing heat riser, is burnt and is generated using heating furnace
800 DEG C or more of high-temperature flue gas is mixed with the denitration flue gas after flue gas heat-exchange unit exchanges heat and is heated up.But due to middle low temperature
The denitration exhaust gas volumn of SCR denitration system is larger, and flue cross section is also larger, and mixes apart from limited, causes high-temperature flue gas in flue
It is inside difficult to uniformly and quickly mix, so that the uniformity of flue-gas temperature is poor, it has been more than the requirement of the code requirement temperature difference ± 10 DEG C,
So that the activity in low-temperature region catalyst is lower, lead to that denitration efficiency is uneven, denitration efficiency is lower.
In conclusion the uniformity of high-temperature flue gas and the mixing of denitration flue gas how is improved, to improve the uniform of flue-gas temperature
Property, denitration efficiency is improved, to be a problem to be solved by those skilled in the art.
Summary of the invention
The object of the present invention is to provide a kind of flue gas mixing heat riser, the equal of high-temperature flue gas and the mixing of denitration flue gas is improved
Even property improves denitration efficiency to improve the uniformity of flue-gas temperature.
It is a further object of the present invention to provide a kind of middle low temperature SCR denitration systems with above-mentioned flue gas mixing heat riser
System.
To achieve the goals above, the invention provides the following technical scheme:
A kind of flue gas mixing heat riser, comprising: flue gas main pipe, gas approach and manifold assemblies；
Wherein, the manifold assemblies include: the coupling part being connected to the flue gas main pipe, for being arranged in the entrance
The gas approach is divided into netted division part in flue and in setting plane；Wherein, the setting plane is vertical
Flue gas flow direction in the gas approach, the coupling part and division part are connected to, and the division sets up separately and sets
There is venthole, the venthole is located in each mesh areas of the gas approach.
Preferably, area equation of the mesh areas described in any two in the setting plane.
Preferably, the mesh areas it is described setting plane in distribution arrangement and the flue gas main pipe length direction it
Between there are angle α, and 0 < α < 90 °.
Preferably, the mesh areas in the setting plane transversely and genesis analysis, wherein the setting plane
It is lateral parallel with the length direction of the flue gas main pipe, the lateral longitudinal direction perpendicular to the setting plane of the setting plane.
Preferably, the manifold assemblies include level-one branch pipe and second level branch pipe；
Wherein, the level-one branch pipe includes the connection pipeline section being sequentially communicated and installation pipeline section, and the connection pipeline section is connected to institute
State installation pipeline section and the flue gas main pipe；The second level branch pipe is connected to the installation pipeline section, and the gas outlet is set to described
Second level branch pipe；The installation pipeline section and the second level branch pipe form the division part, and the connection pipeline section forms the connection
Part.
Preferably, flue gas flow direction layered arrangement of the second level branch pipe in the gas approach, it is described in any two layers
Second level branch pipe in-line arrangement or dislocation arrangement.
Preferably, a/b≤0.2, c/b≤0.2；
Wherein, a is projection of flue gas flow direction of the level-one branch pipe in the flue gas main pipe in the setting plane
Area, c are projected area of flue gas flow direction of the second level branch pipe in the flue gas main pipe in the setting plane, and b is
The area of the cross section of the gas approach, the cross section of the gas approach are parallel to the setting plane.
Preferably, the level-one branch pipe at least two, and the spacing of two adjacent level-one branch pipes is 1000mm-
2000mm；
The second level branch pipe is at least two rows, and is sequentially distributed along the direction perpendicular to the flue gas main pipe length direction；
Row's spacing of the adjacent two rows second level branch pipe is 500mm-1000mm.
Preferably, in each mesh areas, the spacing of two adjacent ventholes is 200mm-500mm.
Preferably, the flue gas main pipe has tapered pipeline section, flue gas stream of the tapered pipeline section in the flue gas main pipe
To tapered.
Preferably, the main pipe section of the flue gas main pipe is trapezoidal, and in the main pipe section and the flue gas main pipe
Flue gas flow direction is parallel.
The mixing principle of flue gas mixing heat riser provided by the invention are as follows: the high-temperature flue gas that heated furnace generates enters cigarette
Then gas main pipe enters division part through coupling part and is drained into the mesh areas of gas approach by venthole；It is changed through flue gas
The denitration flue gas of hot device discharge enters in gas approach, denitration flue gas reach each mesh areas and with the high temperature that drains into mesh areas
Flue gas mixing, the outlet discharge after mixing through gas approach.
Flue gas mixing heat riser provided by the invention, by the division part of manifold assemblies by entrance in setting plane
Flue is divided into netted, and the setting plane is perpendicular to the flue gas flow direction in gas approach, to realize denitration flue gas and high temperature
The mixing of flue gas subnetting porose area effectively increases the uniformity of high-temperature flue gas and the mixing of denitration flue gas, improves the equal of flue-gas temperature
Even property, and then improve denitration efficiency；Meanwhile being mixed simultaneously in each mesh areas, improve mixing efficiency.
Flue gas mixing heat riser based on above-mentioned offer, the present invention also provides a kind of middle low temperature SCR denitration systems, should
Middle low temperature SCR denitration system includes flue gas mixing heat riser, and the flue gas mixing heat riser is described in any of the above embodiments
Flue gas mixing heat riser.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram of flue gas mixing heat riser provided in an embodiment of the present invention；
Fig. 2 is another structural schematic diagram of flue gas mixing heat riser provided in an embodiment of the present invention；
Fig. 3 is the 360m using flue gas mixing heat riser provided in an embodiment of the present invention2Sintering flue gas SCR denitration system
Flue-gas temperature cloud charts at middle first layer catalyst layer top 500mm；
Fig. 4 is the 230m using flue gas mixing heat riser provided in an embodiment of the present invention2Sintering flue gas SCR denitration system
Flue-gas temperature cloud charts at middle first layer catalyst layer top 500mm；
Fig. 5 is 900,000 tons of coke oven flue gas SCR denitration systems using flue gas mixing heat riser provided in an embodiment of the present invention
Flue-gas temperature cloud charts at first layer catalyst layer top 500mm in system.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As depicted in figs. 1 and 2, flue gas mixing heat riser provided in an embodiment of the present invention includes: flue gas main pipe 1, entrance
Flue 4 and manifold assemblies.
Above-mentioned flue gas main pipe 1 with heating furnace for being connected to, so that the high-temperature flue gas that heating furnace generates enters flue gas main pipe 1
It is interior.For the ease of flue gas entrance, one end of above-mentioned flue gas main pipe 1 is input end, and the other end of above-mentioned flue gas main pipe 1 is closing
End.Certainly, the both ends that above-mentioned flue gas main pipe 1 also may be selected are inducer, it is not limited to above-described embodiment.
The import of above-mentioned gas approach 4 with the denitration exhanst gas outlet of flue gas heat-exchange unit for being connected to, for changing by flue gas
The denitration flue gas of hot device enters the gas approach 4；Flue gas of the outlet of above-mentioned gas approach 4 for being connected to Benitration reactor into
Mouth connection, to guarantee that the flue gas Jing Guo Hybrid Heating enters in SCR denitration reaction device.Flue gas flow direction in above-mentioned gas approach 4
For the substantially flow direction of denitration flue gas, as depicted in figs. 1 and 2, the arrow on 4 side of gas approach indicates the flue gas in gas approach 4
Flow direction.
Above-mentioned manifold assemblies include: the coupling part being connected to flue gas main pipe 1, for be arranged in gas approach 4 and
Gas approach 4 is divided into netted division part in setting plane；Wherein, setting plane is perpendicular to the cigarette in gas approach 4
Air-flow is connected to, coupling part with part is divided, and division sets up separately and is equipped with venthole, which is located at gas approach 4
In each mesh areas.
It is understood that gas approach 4 is divided into it is netted, refer to the flue chamber of gas approach 4 is divided into it is netted,
I.e. the flue chamber of gas approach 4 is in netted in setting plane, then shows that gas approach 4 includes multiple mesh areas.
It is understood that the above-mentioned mesh areas of any two is connection, the denitration flue gas into inlet flue gas 4 can be arrived
Up to each mesh areas, inlet flue gas 4 can be discharged in the flue gas of each mesh areas mixing.Each mesh areas is in setting plane
Area is smaller, can more improve the uniformity of mixing.In actual application, setting mesh areas is flat in setting according to actual needs
Area in face, it is not limited in the embodiment of the present invention.
The mixing principle of flue gas mixing heat riser provided in an embodiment of the present invention are as follows: the high-temperature flue gas that heated furnace generates
Into flue gas main pipe 1, then enters through coupling part and divide part and drained by venthole in the mesh areas of gas approach 4；
Through flue gas heat-exchange unit be discharged denitration flue gas enter in gas approach 4, denitration flue gas reach each mesh areas and with drain into mesh
High-temperature flue gas mixing in area, the outlet discharge after mixing through gas approach 4.
Flue gas mixing heat riser provided in an embodiment of the present invention, through the division part of manifold assemblies in setting plane
Gas approach 4 is divided into netted, the setting plane is perpendicular to the flue gas flow direction in gas approach 4, to realize denitration cigarette
Gas and the mixing of high-temperature flue gas subnetting porose area, effectively increase the uniformity of high-temperature flue gas and the mixing of denitration flue gas, improve flue gas
The uniformity of temperature, and then improve denitration efficiency；Meanwhile being mixed simultaneously in each mesh areas, improve mixing efficiency.
In above-mentioned flue gas mixing arrangement, area of two mesh areas in setting plane can be equal, can not also wait.In order to mention
High mixing uniformity, area equation of at least two above-mentioned mesh areas in setting plane.Further, any two mesh areas
Area equation in setting plane.
In above-mentioned flue gas mixing arrangement, distribution for mesh areas is designed according to actual needs.For example, mesh areas
There are angle α, and 0 < α < 90 ° between the length direction of distribution arrangement and flue gas main pipe 1 in setting plane, at this point, mesh
The length direction relative tilt of distribution arrangement and flue gas main pipe 1 of the area in setting plane.
Certainly, above-mentioned mesh areas also may be selected in setting plane transversely and genesis analysis, wherein set the cross of plane
To parallel with the length direction of flue gas main pipe 1, set plane laterally perpendicular to the longitudinal direction of setting plane.
For the specific structure of above-mentioned manifold assemblies, it is designed according to actual needs.Preferably, above-mentioned manifold assemblies packet
Include level-one branch pipe 2 and second level branch pipe 3；Wherein, level-one branch pipe 2 includes the connection pipeline section being sequentially communicated and installation pipeline section, connecting tube
Duan Liantong installs pipeline section and flue gas main pipe 1；Second level branch pipe 3 is connected to installation pipeline section, and gas outlet is set to second level branch pipe 3；Installation
Pipeline section and second level branch pipe 3, which are formed, divides part, and connection pipeline section forms coupling part.
It is understood that connecting tube section is located at the outside of gas approach 4, installing pipe section is located at the inside of gas approach 4.
It is netted in order to guarantee to be divided into the flue chamber of gas approach 4 in setting plane, when above-mentioned level-one branch pipe 2 is one, second level
Branch pipe 3 at least two；When above-mentioned level-one branch pipe 2 at least two, second level branch pipe 3 is at least three.Therefore, each level-one branch
The two sides of pipe 2 are provided with second level branch pipe 3, i.e. second level branch pipe 3 at least two；Above-mentioned gas outlet is set to second level branch pipe 3
Two sides.
In above-mentioned manifold assemblies, when level-one branch pipe 2 at least two, length direction of the level-one branch pipe 2 along flue gas main pipe 1
It is sequentially distributed, and the length direction of level-one branch pipe 2 is perpendicular to the length direction of flue gas main pipe 1；The length direction of second level branch pipe 3 is flat
Row in the length direction of flue gas main pipe 1, second level branch pipe 3 can the length direction only along flue gas main pipe 1 be sequentially distributed, can also be transversely
And genesis analysis.Horizontal and vertical understanding is please referred to above, details are not described herein again.
Further, flue gas flow direction layered arrangement of the above-mentioned second level branch pipe 3 in gas approach 4, as shown in Figure 2.In this way,
It can further improve mixing uniformity.
In above structure, in any two layers, 3 in-line arrangement of second level branch pipe or dislocation arrangement.Wherein, in-line arrangement refers to
Projection weight of the second level branch pipe 3 in the second level branch pipe 3 in the projection and another layer in setting plane in setting plane in one layer
It closes；Dislocation arrangement refers to that second level branch pipe 3 of the second level branch pipe 3 in the projection and another layer in setting plane in one layer is being set
The projection in face is allocated without coincidence part.Above-mentioned projection each means projection caused by the flue gas flow direction in flue gas main pipe 1.
Certainly, it also may be selected there are 3 in-line arrangement of second level branch pipe in two layers and there are second level branch pipe dislocation cloth in two layers
It sets；In actual application, second level branch pipe 3 also may be selected is only one layer, as shown in Figure 1, it is not limited to above-described embodiment.
In order to reduce the resistance caused by flue gas of level-one branch pipe 2, system energy consumption is reduced, a/b≤0.2 is preferentially selected, wherein
A is projected area of flue gas flow direction of the level-one branch pipe 2 in flue gas main pipe 1 in setting plane, and b is the transversal of gas approach 4
The area in face, the cross section of gas approach 4 are parallel to setting plane.
Correspondingly, in order to reduce the resistance caused by flue gas of second level branch pipe 3, reduce system energy consumption, preferentially select c/b≤
0.2, wherein c is projected area of flue gas flow direction of the second level branch pipe 3 in flue gas main pipe 1 in setting plane.
Certainly, above-mentioned ratio can also be selected according to actual needs for other numerical value, it is not limited to this.
In above-mentioned flue gas mixing heat riser, when level-one branch pipe 2 at least two, length of the level-one branch pipe 2 along flue gas main pipe 1
Degree direction is sequentially distributed.For the spacing of two adjacent level-one branch pipes 2, selected according to actual needs.Preferably, adjacent
Two level-one branch pipes 2 spacing be 1000mm-2000mm.This way it is possible to avoid second level branch pipe 3 is too long and influences evenly distributed
Property.Certainly, the spacing that two adjacent level-one branch pipes 2 also may be selected is other numerical value, it is not limited to above-described embodiment.
In above-mentioned flue gas mixing heat riser, second level branch pipe 3 is at least two rows, and along perpendicular to 1 length side of flue gas main pipe
To direction be sequentially distributed；Row's spacing of adjacent two rows of second level branch pipes 3 is 500mm-1000mm.It, can in this spacing range
Ensure that high-temperature flue gas penetrating can effectively cover the region, realizes the efficient mixing of flue gas.
Specifically, any two rows of second level branch pipes 3 are sequentially distributed along the direction perpendicular to 1 length direction of level-one branch pipe.
For the shape of above-mentioned level-one branch pipe 2 and second level branch pipe 3, selected according to actual needs.For example, level-one branch pipe
2 cross section is hexagon, quadrangle or circle etc., and the cross section of second level branch pipe 3 is hexagon, quadrangle or circle etc..Such as
Shown in Fig. 1, the cross section of level-one branch pipe 2 is hexagon, and the cross section of second level branch pipe 3 is hexagon；As shown in Fig. 2, level-one branch
The cross section of pipe 2 is hexagon, and the cross section of second level branch pipe 3 is quadrangle.For the ease of mixing, above-mentioned hexagon is in bar shaped,
Above-mentioned quadrangle is rectangle.
Certainly, above-mentioned level-one branch pipe 2 also may be selected and second level branch pipe 3 is other shapes, it is not limited to above-described embodiment.
Above-mentioned flue gas mixing heat riser sets the spacing of venthole according to actual needs.Preferably, often
In a mesh areas, the spacing of two adjacent ventholes is 200mm-500mm.This ensures that, each ventholes effectively to cover
Cover the flue cross section in the region.
In above-mentioned flue gas mixing heat riser, for the shape of flue gas main pipe 1, it is designed according to actual needs.It is preferred that
Ground, above-mentioned flue gas main pipe 1 have tapered pipeline section, and flue gas flow direction of the tapered pipeline section in flue gas main pipe 1 is tapered.In this way, improving
The uniformity of static pressure in flue gas main pipe 1, to improve distributing uniformity.
It can rounded or quadrangle etc. for the cross section of tapered pipeline section.As depicted in figs. 1 and 2, above-mentioned tapered pipeline section
Cross section is in quadrangle.It should be noted that above-mentioned cross section is perpendicular to the flue gas flow direction in flue gas main pipe 1.
Preferably, the main pipe section of flue gas main pipe 1 is trapezoidal, and the flue gas flow direction in main pipe section and flue gas main pipe 1 is flat
Row.Certainly, it is other shapes that above-mentioned flue gas main pipe 1, which also may be selected, it is not limited to this.
Above-mentioned flue gas main pipe 1 has tapered pipeline section, and it is reducing pipe that entire flue gas main pipe 1, which may be selected, and it is female that flue gas also may be selected
The portions of pipe 1 are tapered pipeline section, are selected as needed in actual application.
Illustrate flue gas mixing heat riser technology achieved provided by the above embodiment below with reference to specific application
Effect.
Embodiment one
Flue gas mixing heat riser provided by the above embodiment is applied into Mr. Yu 360m2In sintering flue gas SCR denitration system,
Denitration flue gas is sintered after flue gas heat-exchange unit recuperation of heat, sintering denitration flue-gas temperature is promoted to 250 DEG C or so, and exhaust gas volumn is
2578500m3/ h, the size of gas approach 4 are 15.6m × 3.5m.To ensure that flue-gas temperature is promoted to 280 DEG C or so, from heating
Furnace internal combustion burns one high-temperature flue gas, and the temperature of the high-temperature flue gas is 800 DEG C, exhaust gas volumn 281800m3/ h, the high-temperature flue gas
Drawn by flue and be connected in above-mentioned flue gas mixing heat riser, high-temperature flue gas passes through the distribution of flue gas main pipe 1 to level-one branch pipe 2
In, it is then sprayed by second level branch pipe 3 to gas approach 4, carries out mixing heating with 250 DEG C of denitration flue gas.
Flue gas main pipe 1 uses cone flue structure in this example, and the entrance of flue gas flow rate 11.5m/s, flue gas main pipe 1 are cut
Face is having a size of 2.6m × 2.6m, and the tail end section of flue gas main pipe 1 is having a size of 2.6m × 0.3m；Level-one branch pipe 2 is eight, level-one branch
The spacing of pipe 2 is 1950mm, and the cross section of level-one branch pipe 2 is hexagon, and the cross-sectional area of level-one branch pipe 2 is 0.74m2, one
The width of grade branch pipe 2 is 0.4m, a/b=0.2, and the high-temperature flue gas flow velocity inside level-one branch pipe 2 is 13m/s；Second level branch pipe 3 is four
Row, row's spacing of second level branch pipe 3 are 875mm, and the cross section of second level branch pipe 3 is hexagon, and the cross-sectional area of second level branch pipe 3 is
0.08m2, the width 0.2m of second level branch pipe 3, c/b=0.18, the high-temperature flue gas flow velocity inside second level branch pipe 3 is 16m/s, simultaneously
The two sides of second level branch pipe 3 are provided with the venthole of 4 φ 150mm, and the pitch of holes of venthole is 387.5mm, venthole aperture
High-temperature flue gas flow velocity is 18m/s.
By using the flue gas mixing heat riser, sunykatuib analysis finds that SCR denitration first layer catalyst may be implemented in it
Flue-gas temperature is distributed in 548K-557K (i.e. 275 DEG C -284 DEG C) range at layer top 500mm, as shown in Figure 3.The system is full
Foot Temperature Distribution deviation is less than ± 5 DEG C of requirement, and the resistance that flue gas mixing heat riser generates denitration flue gas is
145Pa.It can be seen that its resistance generated is lower, but it is preferable to mix temperature rise effect.
Embodiment two
Flue gas mixing heat riser provided by the above embodiment applies Mr. Yu 230m2In sintering flue gas SCR denitration system, burn
Knot denitration flue gas temperature after flue gas heat-exchange unit recuperation of heat is promoted to 250 DEG C, exhaust gas volumn 1865300m3/ h, gas approach 4
Size be 13.75m × 2.9m, using 800 DEG C, 199200m3/ h high-temperature flue gas is heated to 280 DEG C or so.
In this example, flue gas main pipe 1 uses cone flue structure, and the flue gas flow rate in flue gas main pipe 1 is 10m/s, flue gas
The entrance section of main pipe 1 is having a size of 2.35m × 2.35m, and the tail end section of flue gas main pipe 1 is having a size of 2.35m × 0.3m；Level-one branch
Pipe 2 is eight, and the spacing of level-one branch pipe 2 is 1718mm, and the cross section of level-one branch pipe 2 is hexagon, the cross section of level-one branch pipe 2
Area is 0.534m2, the width of level-one branch pipe 2 is 0.32m, a/b=0.186, and the high-temperature flue gas flow velocity inside level-one branch pipe 2 is
13m/s；Second level branch pipe 3 is four rows, and row's spacing of second level branch pipe 3 is 725mm, and the cross section of second level branch pipe 3 is hexagon, second level
The cross-sectional area of branch pipe 3 is 0.58m2, the width of second level branch pipe 3 is 0.15m, c/b=0.168, the height inside second level branch pipe 3
Warm flue gas flow rate is 15m/s, while the two sides of second level branch pipe 3 are provided with the venthole of 4 φ 120mm, and the spacing of venthole is
350mm, the high-temperature flue gas flow velocity in venthole aperture are 19m/s.
By using the flue gas mixing heat riser, sunykatuib analysis finds that SCR denitration first layer catalyst may be implemented in it
Flue-gas temperature is distributed in 548K-558K (i.e. 275 DEG C -285 DEG C) range at layer top 500mm, as shown in figure 4, it meets
Temperature Distribution deviation is less than ± 5 DEG C of requirement, and flue gas mixing heat riser is 127Pa to the resistance that denitration flue gas generates.
Embodiment three
Flue gas mixing heat riser provided by the above embodiment is applied in 900,000 tons of coke oven flue gas SCR denitration systems of Mr. Yu,
Temperature of the coke oven denitration flue gas after flue gas heat-exchange unit recuperation of heat is 200 DEG C, exhaust gas volumn 355230m3/ h, gas approach 4
Size be 6m × 1.3m, using 900 DEG C, 36040m3/ h high-temperature flue gas is heated to 230 DEG C or so.
In this example, flue gas main pipe 1 uses cone flue structure, and the flue gas flow rate in flue gas main pipe 1 is 10m/s, flue gas
The entrance section of main pipe 1 is having a size of 1m × 1m, and the tail end section of flue gas main pipe 1 is having a size of 2.35m × 0.32m；Level-one branch pipe 2 is
Four, the spacing of level-one branch pipe 2 is 1500mm, and the cross section of level-one branch pipe 2 is hexagon, the cross-sectional area of level-one branch pipe 2
For 0.193m2, the width of level-one branch pipe 2 is 0.25m, a/b=0.167, and the high-temperature flue gas flow velocity inside level-one branch pipe 2 is 13m/
s；For second level branch pipe 3 using the double-deck in-line arrangement, second level branch pipe 3 is three rows, and row's spacing of second level branch pipe 3 is 433mm, second level branch pipe
3 cross section is rectangle, and the cross-sectional area of second level branch pipe 3 is 0.14m2, the width of second level branch pipe 3 is 0.09m, c/b=
0.173, the high-temperature flue gas flow velocity inside second level branch pipe 3 is 15m/s, while the two sides of second level branch pipe 3 are provided with 4 φ 86mm's
Venthole, the spacing of venthole are 312.5mm, and the high-temperature flue gas flow velocity in venthole aperture is 18m/s.
By using the flue gas mixing heat riser, sunykatuib analysis finds that SCR denitration first layer catalyst may be implemented in it
Flue-gas temperature is distributed in 498K-508K (i.e. 225 DEG C -235 DEG C) range at layer top 500mm, as shown in figure 5, it meets
Temperature Distribution deviation is less than ± 5 DEG C of requirement, and flue gas mixing heat riser is 135Pa to the resistance that denitration flue gas generates.
By above three embodiments as it can be seen that flue gas mixing heat riser provided in an embodiment of the present invention can effectively realize height
Warm flue gas is distributed and is quickly mixed, the flue gas energy in gas approach 4 in each mesh areas with the more than enough mesh areas of denitration flue gas energy
It is enough to realize quickly and uniformly temperature rise, it avoids in gas approach 4 and big temperature gradient occurs and thermal stress is poor, and ensure final
SCR denitration reaction device internal mix flue-gas temperature deviation can reach ± 5 DEG C of requirements, be much higher than existing code requirement.
The flue gas mixing heat riser provided based on the above embodiment, the embodiment of the invention also provides a kind of middle low temperature
SCR denitration system, low temperature SCR denitration system includes flue gas mixing heat riser in this, which is above-mentioned
The flue gas mixing heat riser that embodiment provides.
Since flue gas mixing heat riser provided by the above embodiment has above-mentioned technique effect, low-temperature SCR is de- among the above
Nitre system has flue gas mixing heat riser provided by the above embodiment, then low temperature SCR denitration system also has accordingly among the above
Technical effect, repeats no more herein.
The foregoing description of the disclosed embodiments can be realized those skilled in the art or using the present invention.To this
A variety of modifications of a little embodiments will be apparent for a person skilled in the art, and the general principles defined herein can
Without departing from the spirit or scope of the present invention, to realize in other embodiments.Therefore, the present invention will not be limited
It is formed on the embodiments shown herein, and is to fit to consistent with the principles and novel features disclosed in this article widest
Range.
Claims (12)
1. a kind of flue gas mixing heat riser characterized by comprising flue gas main pipe (1), gas approach (4) and manifold assemblies；
Wherein, the manifold assemblies include: the coupling part being connected to the flue gas main pipe (1), for being arranged in the entrance
The gas approach (4) is divided into netted division part in flue (4) and in setting plane；Wherein, the setting is flat
Face is perpendicular to the flue gas flow direction in the gas approach (4), and the coupling part is connected to the division part, and the division
Part is provided with venthole, and the venthole is located in each mesh areas of the gas approach (4).
2. flue gas mixing heat riser according to claim 1, which is characterized in that mesh areas is described described in any two
Set the area equation in plane.
3. flue gas mixing heat riser according to claim 1, which is characterized in that the mesh areas is in the setting plane
There are angle α, and 0 < α < 90 ° between the length direction of interior distribution arrangement and the flue gas main pipe (1).
4. flue gas mixing heat riser according to claim 1, which is characterized in that the mesh areas is in the setting plane
Inside transversely and genesis analysis, wherein the transverse direction of the setting plane is parallel with the length direction of the flue gas main pipe (1), institute
State the lateral longitudinal direction perpendicular to the setting plane of setting plane.
5. flue gas mixing heat riser according to claim 1, which is characterized in that the manifold assemblies include level-one branch pipe
(2) and second level branch pipe (3)；
Wherein, the level-one branch pipe (2) includes the connection pipeline section that is sequentially communicated and installation pipeline section, described in the connection pipeline section is connected to
Pipeline section and the flue gas main pipe (1) are installed；The second level branch pipe (3) is connected to the installation pipeline section, and the gas outlet is set to
The second level branch pipe (3)；The installation pipeline section and the second level branch pipe (3) form the division part, the connection pipeline section shape
At the coupling part.
6. flue gas mixing heat riser according to claim 5, which is characterized in that the second level branch pipe (3) along it is described enter
Flue gas flow direction layered arrangement in mouthful flue (4), in any two layers, second level branch pipe (3) in-line arrangement or dislocation arrangement.
7. flue gas mixing heat riser according to claim 5, which is characterized in that
A/b≤0.2, c/b≤0.2；
Wherein, a is throwing of flue gas flow direction of the level-one branch pipe (2) in the flue gas main pipe (1) in the setting plane
Shadow area, c are projection of flue gas flow direction of the second level branch pipe (3) in the flue gas main pipe (1) in the setting plane
Area, b are the area of the cross section of the gas approach (4), and it is flat that the cross section of the gas approach (4) is parallel to the setting
Face.
8. flue gas mixing heat riser according to claim 5, which is characterized in that
The level-one branch pipe (2) at least two, and the spacing of two adjacent level-one branch pipes (2) is 1000mm-
2000mm；
The second level branch pipe (3) is at least two rows, and successively divides along the direction perpendicular to flue gas main pipe (1) length direction
Cloth；Row's spacing of the adjacent two rows second level branch pipe (3) is 500mm-1000mm.
9. flue gas mixing heat riser according to claim 1, which is characterized in that adjacent in each mesh areas
The spacing of two ventholes is 200mm-500mm.
10. flue gas mixing heat riser according to claim 1 to 9, which is characterized in that the flue gas main pipe
(1) there is tapered pipeline section, flue gas flow direction of the tapered pipeline section in the flue gas main pipe (1) is tapered.
11. flue gas mixing heat riser according to claim 10, which is characterized in that the main pipe of the flue gas main pipe (1)
Section is trapezoidal, and the main pipe section is parallel with the flue gas flow direction in the flue gas main pipe (1).
12. a kind of middle low temperature SCR denitration system, including flue gas mixing heat riser, which is characterized in that the flue gas mixing heating
Device is such as flue gas mixing heat riser of any of claims 1-11.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111992029A (en) * | 2020-08-25 | 2020-11-27 | 山东国舜建设集团有限公司 | SCR denitration heat exchanger flue gas preheating device and SCR reactor |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203044243U (en) * | 2012-12-17 | 2013-07-10 | 浙江天地环保工程有限公司 | Smoke denitration ammonia spraying device |
| US20150064083A1 (en) * | 2013-08-28 | 2015-03-05 | Alstom Technology Ltd | Injector grid for high and low dust environment selective catalytic reduction systems |
| CN105536531A (en) * | 2016-01-28 | 2016-05-04 | 北京龙源环保工程有限公司 | High low temperature flue gas mixing device and mixing method |
| CN205216584U (en) * | 2015-11-30 | 2016-05-11 | 武汉凯迪电力环保有限公司 | SCR (selective catalytic reduction) denitration device |
| CN205914019U (en) * | 2016-08-25 | 2017-02-01 | 国网河南省电力公司电力科学研究院 | Novel SCR denitration device |
| CN106731788A (en) * | 2016-11-30 | 2017-05-31 | 浙江大学 | A kind of coke oven flue gas denitrating system and its denitrating technique for mixing reheating with flue gas |
| US20180147529A1 (en) * | 2015-05-21 | 2018-05-31 | Mitsubishi Hitachi Power Systems, Ltd. | Flue gas mixing apparatus |
| CN108325385A (en) * | 2018-04-18 | 2018-07-27 | 中冶京诚工程技术有限公司 | It improves low-temperature SCR catalyst activity and inhibits by-product N2The SCR reactors of O |
| CN109045962A (en) * | 2018-07-25 | 2018-12-21 | 安徽华尔泰化工股份有限公司 | A kind of mobile smoke recyclable device |
| CN209752619U (en) * | 2018-12-26 | 2019-12-10 | 福建龙净脱硫脱硝工程有限公司 | flue gas mixing temperature rising device and medium-low temperature SCR denitration system |
-
2018
- 2018-12-26 CN CN201811598489.1A patent/CN109499358A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203044243U (en) * | 2012-12-17 | 2013-07-10 | 浙江天地环保工程有限公司 | Smoke denitration ammonia spraying device |
| US20150064083A1 (en) * | 2013-08-28 | 2015-03-05 | Alstom Technology Ltd | Injector grid for high and low dust environment selective catalytic reduction systems |
| US20180147529A1 (en) * | 2015-05-21 | 2018-05-31 | Mitsubishi Hitachi Power Systems, Ltd. | Flue gas mixing apparatus |
| CN205216584U (en) * | 2015-11-30 | 2016-05-11 | 武汉凯迪电力环保有限公司 | SCR (selective catalytic reduction) denitration device |
| CN105536531A (en) * | 2016-01-28 | 2016-05-04 | 北京龙源环保工程有限公司 | High low temperature flue gas mixing device and mixing method |
| CN205914019U (en) * | 2016-08-25 | 2017-02-01 | 国网河南省电力公司电力科学研究院 | Novel SCR denitration device |
| CN106731788A (en) * | 2016-11-30 | 2017-05-31 | 浙江大学 | A kind of coke oven flue gas denitrating system and its denitrating technique for mixing reheating with flue gas |
| CN108325385A (en) * | 2018-04-18 | 2018-07-27 | 中冶京诚工程技术有限公司 | It improves low-temperature SCR catalyst activity and inhibits by-product N2The SCR reactors of O |
| CN109045962A (en) * | 2018-07-25 | 2018-12-21 | 安徽华尔泰化工股份有限公司 | A kind of mobile smoke recyclable device |
| CN209752619U (en) * | 2018-12-26 | 2019-12-10 | 福建龙净脱硫脱硝工程有限公司 | flue gas mixing temperature rising device and medium-low temperature SCR denitration system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111992029A (en) * | 2020-08-25 | 2020-11-27 | 山东国舜建设集团有限公司 | SCR denitration heat exchanger flue gas preheating device and SCR reactor |
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