CN106568095B - The double S types of gas-turbine waste heat boiler flow diffusion transition flue - Google Patents
The double S types of gas-turbine waste heat boiler flow diffusion transition flue Download PDFInfo
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- CN106568095B CN106568095B CN201610959295.4A CN201610959295A CN106568095B CN 106568095 B CN106568095 B CN 106568095B CN 201610959295 A CN201610959295 A CN 201610959295A CN 106568095 B CN106568095 B CN 106568095B
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- flue
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- heat boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J11/00—Devices for conducting smoke or fumes, e.g. flues
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
Abstract
The invention discloses a kind of transition flue duct used in gas-turbine waste heat boiler, transition flue duct is that double S types flow diffusion design.The high velocity smoke that the present invention can be such that gas turbine exports realizes abundant diffusion in transition flue duct, reduce recirculation zone area and boundary layer separation, the uniformity with exhaust-heat boiler inlet section flow of flue gas in transition flue duct is not only effectively improved, the safety in operation and economy of equipment are also substantially increased.
Description
Technical field
The present invention is applied in gas-turbine waste heat boiler field, is specifically related to one kind and effectively improving exhaust-heat boiler inlet
The transition flue duct of planar velocity uniformity.
Background technology
Gas turbine transition flue is the channel connected between gas turbine outlet and exhaust-heat boiler inlet.Due to combustion gas wheel
Machine outlet is larger with the planar dimension difference of exhaust-heat boiler inlet, the former area is only the 10% of the latter sometimes, therefore, how to be drawn
Lead flue gas stream diffusion so that do not occur larger speed difference and reflux in flue, ensure the equal of waste heat boiler heating surface flow field
Even property is that influence residual heat boiler for exchanging heat performance and the pipe that keeps from heat generate the important of the safety problems such as vibration because local assault is excessive
Factor.
Usual gas turbine outlet is positioned at the position relatively on the lower side of exhaust-heat boiler inlet, and the two area difference is larger, because
The reasonability of this transition flue duct structure design is most important.Traditional transition flue duct is that two-part or three-stage design, i.e., following
Plate is directly connected to, and two sections of flues that top panel is divided to the elevation angle (slope) different are expanded or finally have one section of horizontal segment and waste heat pot upwards
Stove entrance connects, and the both sides panel of flue is then accordingly expanded with upper and lower panel.Flue gas enter the flue after flow condition not
It is good：Stack base flue gas flow rate is excessively high, and middle part and top flow velocity are too low, and velocity gradient is larger；(i.e. waste heat boiler enters flue outlet
Mouthful) at generate vortex, volume suction it is strong.In addition, the backflow effeet that top low regime is brought also leads to the cigarette in residual heat boiler for exchanging heat face
Gas velocity distributed pole is uneven, not only seriously reduces the heat exchange property of waste heat boiler tube bundle, heat exchange efficiency is caused to refer to down to design
Under mark, also by bring bottom high-speed flow wash away under tube bundle vibration and damage risk, greatly reduce the property of waste heat boiler
Energy and service life.
The measure for solving transition flue duct flow of flue gas non-uniformity problem at present has：
1. by the way that the corner position of flue top panel is arranged, suitable elevation angle size, the upper surface of Request for Change elevation angle plate are selected
The two-part panel that respectively may be about 30 ° and 50 ° for the elevation angle reduces flue top to reduce the maximum speed of outlet
Recirculation zone area, but final flow of flue gas uniformity is not significantly improved.
2. deflector is installed additional near transition flue duct entrance (gas turbine outlet) position, by the beginning of deflector and upper face
The guide functions of beginning tilting section force the sub-thread flue gas of flue lower part high speed to be divided into multiply air-flow and fill entire flue.It is similar
The grid baffle towards flue entrance can be installed in the high-speed flow area around flue lower panel, fraction is made to be forced to flue
It flows top low regime.The above internal diversion method can substantially reduce the lower part flow velocity of outlet, improve middle and upper part flow velocity, have
Effect improves velocity of flue gas distributing homogeneity.But the structure design of such flue increases the flow resistance of flue gas, completely negative in unit
There are diversion components to blow off the security risks such as damage when lotus runs.
3. changing primary air reaches the relative position before exhanst gas outlet, flue is spread by the smaller S type lists in import section
It guides air-flow to flow to the center of opposite exhaust-heat boiler flue gas import from the lower position of transition flue duct entrance, then becomes with circle
The pipeline guiding flue gas of side enters rear portion diffusion region, and the final linear entirely outlet that extends to (can also install additional in rear portion diffuser
Center baffle).The structure flue reduces the area in smoke backflow area, improves middle and upper part flow velocity, significantly improves flue gas
Flow uniformity so that weaken tube bank suffered scouring intensity while residual heat boiler for exchanging heat performance optimizes significantly, improve operation
Economy and safety, but the fluid resistance loss of the program is larger.
In short, the existing transition flue duct design overwhelming majority is set using the flue in the gas inlet section of reduced size
Meter guides flue gas in exhaust-heat boiler inlet heating surface Uniform Flow by optimization transition flue duct exterior geometry, and in flue gas
Entrance just directly spreads the design of flue gas using the flue of larger circulation area, and there is not been reported；In addition, existing design is to cigarette
Optimization inside road considers to add small parts (deflector, Turbogrid plates etc.) mostly, but this method is improving the same of flow uniformity
When bring larger fluid resistance loss and operational safety risk.Therefore, research and development one kind can so that flow of flue gas is more uniform
It is again not particularly important using fluid resistance loss as the safe and reliable transition flue duct of cost.
Invention content
Technical problem：The object of the present invention is to provide a kind of double S types of gas-turbine waste heat boiler to flow diffusion transition flue,
Exhaust-heat boiler inlet flow of flue gas uniformity can be improved by being one kind, enhanced waste heat boiler heating surface heat exchange property, reduced because of stream
The tube bundle vibration and wear phenomenon that fast unevenness is caused, and can reduce by fluid resistance loss caused by structure design and baffle
The novel transition flue for the risk that falls off.
Technical solution：The double S types of gas-turbine waste heat boiler of the present invention flow diffusion transition flue and solve the above problems institute
The new technical solution used is as follows.
The transition flue duct includes gas turbine outlet circular cross-section, circle-side's degree of switching flue, the equal flow flue of double S types, gradually
Expand nozzle flue, lienar for diffusion flue, S types baffle, exhaust-heat boiler flue gas entrance section；Wherein, gas turbine outlet is round
Section, circle-side's degree of switching flue, the equal flow flue of double S types, flaring nozzle flue, lienar for diffusion flue, exhaust-heat boiler flue gas
Entrance section is linked in sequence, and the center line that S type baffles are located in the equal flow flue of double S types along double equal flow flues of S types is arranged, one end
The outlet of the square degree of switching flue of circle-is connect, another termination expands the outlet of nozzle flue, and flue is divided into two parts up and down, the S types
The tail portion of baffle is that the part being located in flaring nozzle flue tilts upwards.
The flaring nozzle flue, lienar for diffusion flue be the horn shape that outlet is more than import.
The S type baffles are located at the upward sloping portion in flaring nozzle flue, and inclination angle is 30 degree of -60 degree.
The flue first passes through the rectangular conversion of circle-that horizontal segment carries out flue in initial segment, to adapt to the rectangle in double S types channels
The requirement in import section.Then, flue gas enters two S types channels of the equal flow flue of double S types along S type baffles, and flue gas leads at two
Gradually diffusion respectively in road.Double equal circulation roads of S types realize larger flow section, and flue gas energy in flow of flue gas initial segment
It is enough directly to spread, while but also flue gas is led to from the lower position of gas turbine outlet in exhaust-heat boiler inlet section
Near the heart, to be more favorable for Uniform Flow of the flue gas on waste heat boiler import section.
Flue gas is after completing preliminary stream diffusion, tilting section two parts on the tail portion of flaring nozzle flue and S type baffles
Continue two-pass flow in the channel of composition.Wherein, the streamlined diffusion structure of the flue can be reduced along the boundary of wall surface
The generation of layer separation and reverse backflow phenomenon；There is the chamfer design of guide functions flue gas to be promoted to seamlessly transit and draw for flue lower part
It leads lower channel air-flow smoothly to reach near outlet stage casing, to achieve the effect that more preferably flow of flue gas.Pay special attention in this section
The direction of upper channel part high-speed flow can be changed in tilting section on the tail portion of portion S type baffles, the hang plate so that flue gas flow rate is equal
It is even, mitigate the backflow effeet above S type baffles.
Hereafter, flue gas enters from the outlet of flaring nozzle flue, by bifilar air-flow weight in lienar for spreads flue
Single stream newly is accumulated, and completes last diffusion, reaches exhaust-heat boiler inlet section, it is final to realize flue gas in waste heat boiler
The homogenization of entrance section distribution.
The present invention (double S types flow diffusion flue) can be in the size difference and position of transition flue duct import section and outlet
Set height tolerance it is larger when, realize that ideal flue gas evenly distributes.
Advantageous effect：The present invention has the following advantages and improves compared with existing transition flue duct：
1. the double S type structures of main body of the present invention are histogram structure, easily fabricated.The histogram that flue gas simultaneously flows through two S types is logical
Road finally leads to the near center location in opposite outlet section, changes original air-flow in the dispersal direction of opposite outlet bottom end, makes
It efficiently spreads in flue, effectively enhances flue gas flow rate distributing homogeneity；
2. the present invention just uses the design of larger flow area in the flue of gas inlet initial segment so that flue gas is in import
Place is just diffused, and is realized that gas turbine exports the reduction step by step of high velocity smoke speed by diffusion design later, is realized flue gas
In being uniformly distributed for exhaust-heat boiler inlet section, and mitigate the vibration and damage of exchanging pipe of boiler by waste beam simultaneously；
3. flow resistance of the present invention is small.Deflector is not provided in transition flue duct but use inner passage partition board with it is upper tiltedly
The integrated design of section, not only greatly reduces drag losses caused by deflector in existing transition flue duct, can also eliminate water conservancy diversion
The components such as plate blow off risk, improve economy and the safety of transition flue duct.
Description of the drawings
Fig. 1 is the two-dimensional representation that double S types of the invention flow diffusion flue,
Fig. 2 is traditional transition flue duct schematic diagram,
Flue gas flow rate of the traditional transition flue ducts of Fig. 3 along flow of flue gas directional profile and exhaust-heat boiler inlet section is distributed,
The bis- S types of Fig. 4 flow diffusion transition flue schematic diagram,
The bis- S types of Fig. 5 flow flue gas stream of the diffusion transition flue along flow of flue gas directional profile and exhaust-heat boiler inlet section
Speed distribution,
Fig. 6 exhaust-heat boiler inlet kernel of section line upper edge short transverse flue gas flow rate distribution curves.
Have in figure：Gas turbine exports circular cross-section 1, the square degree of switching flue 2 of circle-, double equal flow flues 3 of S types, flaring spray
Nozzle flue 4, lienar for spread flue 5, S types baffle 6, exhaust-heat boiler flue gas entrance section 7.
Specific implementation mode
It is binary channels flue that the transition flue duct of the present invention, which changes previous single channel flue,：
The present invention is that a kind of double S types used in gas-turbine waste heat boiler flow diffusion transition flue, the device by
The square degree of switching flue 2 of circle-, double equal flow flues 3 of S types, flaring nozzle flue 4, lienar for spread flue 5 and 6 structure of S types baffle
At.S types baffle 6 can be tail portion tilting in the present invention, or formula that tail portion is straight can select the most according to flue size
Suitable S type baffle positions.In the present embodiment, the design of tail portion tilting S types baffle 6 is used.
The key technology of the present invention is the design of S type baffles.Guide high velocity smoke from bottom to waste heat pot by S type baffles
Flowing in the middle part of stove section, realizes velocity of flue gas being uniformly distributed in exhaust-heat boiler flue gas entrance section 6.Wherein, it is contemplated that on double S
Influence of the turning of feeder connection initial segment to air-flow determines that S type baffle positions are entrance section when design after repeatedly simulation
Axis a little position on the lower side.
In conjunction with specific case, the transition using Fluent business softwares to certain existing traditional transition flue duct and the present invention
Flow of flue gas inside flue carries out numerical simulation, and by the analysis of analog result, the technical side taken this transition flue duct
The effect and advantage of case are further described.
Simulated flue gas flows into certain traditional transition flue duct (attached drawing 2) along z-axis forward direction with 68m/s, and gained is along flow of flue gas side
Velocity contour and result to velocity profile and exhaust-heat boiler inlet section 6 is as shown in Fig. 3.
By attached drawing 3 it is found that primary air area (speed is about in 35-68m/s) accounts for about the 16% of conventional transition flue outlet section,
And outlet bottom is mainly distributed in high flow rate (up to 68.7m/s), to tube bank at exhaust-heat boiler inlet cause compared with
Big vibration damage.Central region occurrence of large-area backflow phenomenon (maximum back-flow velocity reaches -8.6m/s), recirculating zone in outlet
Area accounts for 60% or so of general export sectional area, and is then respectively less than 5m/s in the flue gas flow rate of flue upper area.Therefore it uses and passes
When system type transition flue duct, the flow of flue gas uniformity in exhaust-heat boiler inlet section is poor.
Double S types using the present invention flow diffusion transition flue (attached drawing 3) and carry out numerical simulation, result such as 4 institute of attached drawing
Show.Air-flow is drained to by double equal flow flues of S types relative in waste heat boiler import section after circle-side's degree of switching flue
Heart areas adjacent；Flue is then spread by expansion nozzle type and lienar for diffusion flue further spreads high velocity smoke stream so that
Flow velocity declines, and is evenly distributed.From attached drawing 4 it is found that exhaust-heat boiler inlet section speed is except depositing in surrounding fraction region in the present invention
Certain low speed or recirculating zone (speed is about -5~5m/s, accounts for 30% of outlet or so) outside, most of flue gas flow rate exists
Between 20~35m/s (highest 40.3m/s), no high-speed region.It is diffused through using double S types streams equally it can be seen from attached drawing 5
When crossing flue, exhaust-heat boiler inlet kernel of section line upper edge height velocity flow profile is more uniformly flat compared with traditional transition flue duct
Surely.It can be seen from the above result that flue gas flow rate distributing homogeneity is compared traditional transition flue duct and is obtained on heat boiler outlet section
Preferably optimization.
Compared with traditional flue, the present invention effectively improves that exhaust-heat boiler inlet section-bottom flue gas flow rate is big, distribution
The phenomenon that lack of homogeneity, had both enhanced the uniformity of flue gas flow rate distribution, while having been alleviated to waste heat by reducing flue gas flow rate
Bundle vibration and abrasion at boiler inlet.In addition, the present invention S type baffles tail portion upper tilting design can replace it is existing
The small-sized diversion component such as the deflector of transition flue duct guides flue gas Uniform Flow, while also avoiding such small-sized diversion component
Risk is blown off when operation.
Claims (3)
1. a kind of double S types of gas-turbine waste heat boiler flow diffusion transition flue, it is characterised in that the transition flue duct includes combustion gas
Turbine exports the square degree of switching flue (2) of circular cross-section (1), circle-, double equal flow flues of S types (3), flaring nozzle flue (4), line
Property type diffusion flue (5), S types baffle (6), exhaust-heat boiler flue gas entrance section (7)；Wherein, gas turbine exports circular cross-section
(1), circle-square degree of switching flue (2), double equal flow flues of S types (3), flaring nozzle flue (4), lienar for diffusion flue (5),
Exhaust-heat boiler flue gas entrance section (7) is linked in sequence, and double equal flow flues of S types (3) are separated to form by S types baffle (6), that is, S
The center line that type baffle (6) is located in double equal flow flues of S types (3) along double equal flow flues of S types (3) is arranged, and one termination circle-side turns
The outlet of horizontal flue (2) is changed, another termination expands the outlet of nozzle flue (4), and flue is divided into two parts up and down, S types gear
The tail portion of plate (6) is that the part being located in flaring nozzle flue (4) tilts upwards.
2. the double S types of gas-turbine waste heat boiler according to claim 1 flow diffusion transition flue, it is characterised in that described
Flaring nozzle flue (4), lienar for diffusion flue (5) be outlet be more than import horn shape.
3. the double S types of gas-turbine waste heat boiler according to claim 1 flow diffusion transition flue, it is characterised in that described
S types baffle (6) be located at the upward sloping portion in flaring nozzle flue (4), inclination angle is 30 degree -60 and spends.
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| CN201610959295.4A CN106568095B (en) | 2016-11-03 | 2016-11-03 | The double S types of gas-turbine waste heat boiler flow diffusion transition flue |
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| CN110160031B (en) * | 2019-06-25 | 2023-12-01 | 哈尔滨驰远电力设备工程有限公司 | Deformation preventing device for boiler tube row, and use method and application thereof |
| CN112733464A (en) * | 2020-11-10 | 2021-04-30 | 苏州西热节能环保技术有限公司 | Method for eliminating flue vibration of inlet and outlet of induced draft fan based on flow field optimization |
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| US20110162339A1 (en) * | 2011-01-07 | 2011-07-07 | Braden Manufacturing, Llc | Flow distribution of gas turbine exhaust using walls shaped to facilitate improved gas flow |
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| CN103032175A (en) * | 2011-10-05 | 2013-04-10 | 通用电气公司 | Method of heating gas turbine inlet |
| CN103486602A (en) * | 2013-10-08 | 2014-01-01 | 东南大学 | Three-level flow equalizing, diffusion and transition flue of heat recovery boiler of gas turbine |
| CN204829972U (en) * | 2015-08-25 | 2015-12-02 | 杭州锅炉集团股份有限公司 | Combustion engine exhaust -heat boiler multistage formula import extension flue |
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