CN112377936A - Method for reducing resistance of boiler flue gas duct system - Google Patents
Method for reducing resistance of boiler flue gas duct system Download PDFInfo
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- CN112377936A CN112377936A CN202011293768.4A CN202011293768A CN112377936A CN 112377936 A CN112377936 A CN 112377936A CN 202011293768 A CN202011293768 A CN 202011293768A CN 112377936 A CN112377936 A CN 112377936A
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- flue gas
- gas duct
- resistance
- boundary layer
- shaped
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 239000003546 flue gas Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000000779 smoke Substances 0.000 claims abstract description 21
- 239000012530 fluid Substances 0.000 claims description 19
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Classifications
-
- 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
- F23J13/08—Doors or covers specially adapted for smoke-boxes, flues, or chimneys
Abstract
A method for reducing the resistance of a boiler flue gas duct system relates to the technical field of boiler air ducts, and aims at the problem of low overall operation efficiency of a boiler of the flue gas duct system in the prior art, and comprises the following steps: the method comprises the following steps: a plurality of V-shaped turbulence fins are arranged in the smoke air duct; step two: acquiring the height h of the V-shaped turbulence fins and the distance s between two adjacent V-shaped turbulence fins; step three: and finally, controlling the resistance of the boiler flue gas duct system according to the control parameters by controlling the ratio of dimensionless parameters, namely h/s and combining CFD to obtain the control parameters. The V-shaped fins are arranged in the flue gas duct, so that the friction resistance inside the duct in the gas flowing process in the flue gas duct is reduced, the energy consumption of a flue gas system is reduced, and the overall operation efficiency of the boiler is improved. The optimal control value is found by controlling other variables to be unchanged and changing the value of h/s, and the optimal drag reduction rate can reach 10.2%.
Description
Technical Field
The invention relates to the technical field of boiler air ducts, in particular to a method for reducing the resistance of a boiler flue gas air duct system.
Background
The energy consumption of a station boiler smoke and air system accounts for about 30% of the station power, the integral operation economy of the boiler is seriously influenced, and the friction resistance between fluid flowing in a pipeline and the pipe wall is the main reason for increasing the energy consumption of a fan. At present, the measures of the power plant in the aspect of reducing the energy consumption of a smoke and wind system mainly comprise: (1) a guide plate is arranged at the sharp turning part of the smoke and air duct; (2) a blade type fluid director is additionally arranged at the outlet of the dust remover; (3) and the air duct is used for blocking air leakage. The method can only be used for reducing the local resistance of the smoke and wind system, and still lacks effective measures aiming at reducing the on-way resistance of the smoke and wind system.
Disclosure of Invention
The purpose of the invention is: aiming at the problem of low overall operation efficiency of a boiler of a flue gas and air system in the prior art, a method for reducing the resistance of a flue gas and air duct system of the boiler is provided.
The technical scheme adopted by the invention to solve the technical problems is as follows:
a method for reducing the drag of a boiler flue gas duct system, comprising the steps of:
the method comprises the following steps: determining the height h of the V-shaped turbulence fins and the distance s between two adjacent V-shaped turbulence fins according to the thickness of a fluid turbulence boundary layer in the smoke air duct;
step two: obtaining a control parameter by controlling the ratio of dimensionless parameters, namely h/s, and combining a CFD value;
step three: and arranging V-shaped turbulence fins in the smoke air duct according to the control parameters.
Further, in the step one, the height h of the V-shaped turbulence fins is obtained by the steps of:
the method comprises the steps of firstly obtaining the flowing speed of fluid in a flue gas duct, then obtaining the thickness of a turbulent boundary layer in the flue gas duct according to the flowing speed of the fluid in the flue gas duct, and determining the height h of the V-shaped turbulence rib according to the thickness of the turbulent boundary layer in the flue gas duct.
Further, the thickness of the turbulent boundary layer in the smoke and air duct is obtained by a flat turbulent boundary layer calculation method.
Further, the specific acquiring step of the thickness of the turbulent boundary layer in the flue duct is as follows:
taking the edge of the flat plate as a coordinate origin, taking the direction of the flat plate as an x axis, and the thickness expression of the boundary layer is as follows:
where δ represents the boundary layer thickness, υ represents the fluid kinematic viscosity, and V∞Representing the incoming flow velocity.
Furthermore, the height h of the V-shaped turbulence fins and the distance s between two adjacent V-shaped turbulence fins are obtained through priori knowledge.
Furthermore, the V-shaped turbulence fins are multiple.
Further, the V-shaped turbulence ribs are arranged discontinuously.
Further, the method further comprises the fourth step of: and detecting the resistance of the smoke air duct system through the relative resistance reduction amount.
Further, the relative drag reduction amount is expressed as:
sigma is relative drag reduction; f1To control the total resistance experienced by the front smooth surface; f2To control the total resistance to the surface of the rear drag reduction rib.
The invention has the beneficial effects that:
the V-shaped fins are arranged in the flue gas duct, so that the friction resistance inside the duct in the gas flowing process in the flue gas duct is reduced, the energy consumption of a flue gas system is reduced, and the overall operation efficiency of the boiler is improved. The optimal control value is found by controlling other variables to be unchanged and changing the value of h/s, and the optimal drag reduction rate can reach 10.2%.
The local fins can maintain a certain distance of control effect in the downstream of the flow direction, so that only intermittent arrangement is needed, and continuity is not needed.
Drawings
FIG. 1 is an overall layout of the present invention;
FIG. 2 is an enlarged view of portion A of the present invention;
FIG. 3 is a schematic view of the arrangement of a plurality of V-shaped turbulating ribs in accordance with the present invention.
Detailed Description
It should be noted that, in the present invention, the embodiments disclosed in the present application may be combined with each other without conflict.
The first embodiment is as follows: referring to fig. 1 and 2, the embodiment is specifically described, and the method for reducing the resistance of the boiler flue gas duct system comprises the following steps:
the method comprises the following steps: determining the height h of the V-shaped turbulence fins and the distance s between two adjacent V-shaped turbulence fins according to the thickness of a fluid turbulence boundary layer in the smoke air duct;
step two: obtaining a control parameter by controlling the ratio of dimensionless parameters, namely h/s, and combining a CFD value;
step three: and arranging V-shaped turbulence fins in the smoke air duct according to the control parameters.
The specific thought of the application is as follows:
v-shaped turbulence fins are arranged in the smoke air duct 1, as shown in figure 3, and interfere with the flow of fluid in the smoke air duct, so that the aim of reducing the frictional resistance between the fluid and the inside of the duct is fulfilled. The main parameters influencing the control effect are the height h of the fins and the distance s between the adjacent fins, and the optimal control parameters are obtained by controlling the ratio of the dimensionless parameters h/s and combining CFD simulation calculation, so that the optimal resistance reduction effect is obtained.
Firstly, calculating the thickness of a turbulent boundary layer in the smoke duct according to the flowing speed of fluid in the smoke duct so as to determine the value range of h, and calculating the thickness of the turbulent boundary layer of fluid in the rectangular smoke duct, wherein a flat turbulent boundary layer calculation method can be adopted, the origin of coordinates is taken at the edge of a flat plate, the x axis is along the direction of the flat plate, and the calculation formula is as follows:
wherein δ represents the boundary layer thickness;
v denotes the fluid kinematic viscosity
V∞Indicating the incoming flow velocity
The invention uses the relative drag reduction amount to evaluate the drag reduction effect of the rib surface. The relative drag reduction is defined as:
wherein σ is the relative drag reduction amount; f1To control the total resistance experienced by the front smooth surface; f2To control the total resistance to the surface of the rear drag reduction rib.
The optimal control value is found by controlling other variables to be unchanged and changing the value of h/s, and the optimal drag reduction rate can reach 10.2%.
The local fins can maintain a certain distance of control effect in the downstream of the flow direction, so that only intermittent arrangement is needed, and continuity is not needed.
The second embodiment is as follows: the embodiment is further described with respect to the first embodiment, and the difference between the first embodiment and the first embodiment is that the step of obtaining the height h of the V-shaped turbulence fin in the step one is as follows:
the method comprises the steps of firstly obtaining the flowing speed of fluid in a flue gas duct, then obtaining the thickness of a turbulent boundary layer in the flue gas duct according to the flowing speed of the fluid in the flue gas duct, and determining the height h of the V-shaped turbulence rib according to the thickness of the turbulent boundary layer in the flue gas duct.
The third concrete implementation mode: the second embodiment is further described, and the difference between the second embodiment and the first embodiment is that the thickness of the turbulent boundary layer in the flue gas duct is obtained by a flat turbulent boundary layer calculation method.
The fourth concrete implementation mode: the third embodiment is further described, and the difference between the third embodiment and the fourth embodiment is that the specific acquiring step of the thickness of the turbulent boundary layer in the flue duct is as follows:
taking the edge of the flat plate as a coordinate origin, taking the direction of the flat plate as an x axis, and the thickness expression of the boundary layer is as follows:
where δ represents the boundary layer thickness, υ represents the fluid kinematic viscosity, and V∞Representing the incoming flow velocity.
The fifth concrete implementation mode: the fourth embodiment is further described, and the difference between the fourth embodiment and the fourth embodiment is that the height h of the V-shaped turbulence fins and the distance s between two adjacent V-shaped turbulence fins are obtained through priori knowledge.
The sixth specific implementation mode: the fifth embodiment is further described, and the difference between the fifth embodiment and the fifth embodiment is that a plurality of V-shaped turbulence fins are provided.
The seventh embodiment: the present embodiment is further described with respect to the sixth embodiment, and the difference between the present embodiment and the sixth embodiment is that the plurality of V-shaped turbulence fins are intermittently arranged.
The specific implementation mode is eight: this embodiment is a further description of a seventh embodiment, and the difference between this embodiment and the seventh embodiment is that the method further includes a fourth step: and detecting the resistance of the smoke air duct system through the relative resistance reduction amount.
The specific implementation method nine: the present embodiment is a further description of an eighth specific embodiment, and the difference between the present embodiment and the eighth specific embodiment is that the air duct system resistance is represented by a relative drag reduction amount, where the relative drag reduction amount is expressed as:
sigma is relative drag reduction; f1To control the total resistance experienced by the front smooth surface; f2To control the total resistance to the surface of the rear drag reduction rib.
It should be noted that the detailed description is only for explaining and explaining the technical solution of the present invention, and the scope of protection of the claims is not limited thereby. It is intended that all such modifications and variations be included within the scope of the invention as defined in the following claims and the description.
Claims (9)
1. A method for reducing the drag of a boiler flue system, comprising the steps of:
the method comprises the following steps: determining the height h of the V-shaped turbulence fins and the distance s between two adjacent V-shaped turbulence fins according to the thickness of a fluid turbulence boundary layer in the smoke air duct;
step two: obtaining a control parameter by controlling the ratio of dimensionless parameters, namely h/s, and combining a CFD value;
step three: and arranging V-shaped turbulence fins in the smoke air duct according to the control parameters.
2. The method for reducing the resistance of a boiler flue system as recited in claim 1, wherein in the first step, the height h of the V-shaped turbulence ribs is obtained by the steps of:
the method comprises the steps of firstly obtaining the flowing speed of fluid in a flue gas duct, then obtaining the thickness of a turbulent boundary layer in the flue gas duct according to the flowing speed of the fluid in the flue gas duct, and determining the height h of the V-shaped turbulence rib according to the thickness of the turbulent boundary layer in the flue gas duct.
3. The method for reducing the resistance of a boiler flue gas duct system according to claim 2, wherein the thickness of the turbulent boundary layer in the flue gas duct is obtained by a flat turbulent boundary layer calculation method.
4. A method for reducing the resistance of a boiler flue system according to claim 3, wherein the thickness of the turbulent boundary layer in the flue is obtained by the following steps:
taking the edge of the flat plate as a coordinate origin, taking the direction of the flat plate as an x axis, and the thickness expression of the boundary layer is as follows:
where δ represents the boundary layer thickness and υ representsKinematic viscosity of fluid, V∞Representing the incoming flow velocity.
5. The method of claim 4, wherein the height h of the V-shaped turbulator fins and the distance s between two adjacent V-shaped turbulator fins are obtained by a priori knowledge.
6. The method of claim 5, wherein the plurality of V-shaped turbulator ribs are provided.
7. The method for reducing the drag of a boiler flue gas duct system as recited in claim 6, wherein said plurality of V-shaped turbulating ribs are intermittently disposed.
8. A method for reducing the resistance of a boiler flue gas duct system according to claim 7, characterized in that said method further comprises the steps of four: and detecting the resistance of the smoke air duct system through the relative resistance reduction amount.
9. The method for reducing the resistance of a boiler flue gas duct system according to claim 8, wherein said relative drag reduction is expressed as:
sigma is relative drag reduction; f1To control the total resistance experienced by the front smooth surface; f2To control the total resistance to the surface of the rear drag reduction rib.
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| CN202011293768.4A CN112377936A (en) | 2020-11-18 | 2020-11-18 | Method for reducing resistance of boiler flue gas duct system |
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| CN202011293768.4A CN112377936A (en) | 2020-11-18 | 2020-11-18 | Method for reducing resistance of boiler flue gas duct system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114676656A (en) * | 2022-05-27 | 2022-06-28 | 中国空气动力研究与发展中心计算空气动力研究所 | Consistency measurement method, device, equipment and storage medium of multi-response CFD model |
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| US20090256385A1 (en) * | 2008-04-14 | 2009-10-15 | Fast Skinz Inc. | Vehicle with drag-reducing outer surface |
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Application publication date: 20210219 |