CN109829189A - A kind of Boiler Furnace slagging thickness judgment method based on numerical simulation - Google Patents
A kind of Boiler Furnace slagging thickness judgment method based on numerical simulation Download PDFInfo
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Abstract
The present invention proposes a kind of Boiler Furnace slagging thickness judgment method based on numerical simulation, step A: by burner hearth data inputting model；Step B: grid dividing is carried out to burner hearth；Step C: numerical simulation, setting condition model and simulation algorithm are carried out in FLUENT software；Step D: collecting real data in burner hearth, and import in simulation algorithm, obtains flame combustion temperature；Step E: by the first thermodynamic computing formula, the wall temperature obtained when cleaning water-cooling wall is 0mm slagging thickness is calculated；Step F: the wall temperature for cleaning water-cooling wall is imported in simulation algorithm, is obtained reference data and is compared with real data；Step G: reference data and flame combustion temperature are substituted into the second thermodynamic computing formula, are obtained the wall temperature stain when water-cooling wall is n mm slagging thickness, and import in simulation algorithm, are obtained wall temperature data when different slagging thickness；Step H: wall temperature data when by different slagging thickness carry out formula fitting, obtain the relational expression of slagging thickness and furnace outlet gas temperature.
Description
Technical field
The present invention relates to simulation calculating field more particularly to a kind of Boiler Furnace slagging thickness judgement sides based on numerical simulation
Method.
Background technique
In recent years, the domestic research there are many to ash erosion and prediction, and in practical boiler operatiopn, operations staff needs
The degree and development trend of ash erosion dust stratification are understood in time, and according to the situation of fouling and slagging and operation needs, rationally, effectively
Ground acts soot blower.Due to the limitation of boiler actual environment condition, it is impossible to directly judge the slagging situation in furnace.It is domestic at present
The soot blower system in each power station works by the soot blower period being previously set substantially, it is difficult to make a response in time to instant situation.Soot blowing
Device frequency of use excessively will cause transducer wall's abrasion, waste energy consumption, reduce fire box temperature；Soot blower frequency of use is very few, will lead to
The problems such as slagging dust stratification is cleared up not in time, increases the heat transmission resistance of boiler heating surface, heat transfer deterioration.
The radiant emissivity of water cooling wall surface is directly measured using the Infrared imaging cameras mounted in different location to reflect wall
The Slagging in face, but Infrared imaging cameras involves great expense, operating cost is high, is not widely applied.Using being mounted on water cooling
Heat-flow meter on wall as diagnostic sensor, with the generation of contamination its neighbouring water-cooling wall slagging of analysis mode on heat-flow meter surface and
Development process, the changes of heat flux according to caused by slagging can be diagnosed and be monitored to slagging, but heat-flow meter is difficult in maintenance, once go out
Existing problem just needs blowing out to repair, and influences power station normal operation.
Fin panel casing temperature field is solved using Finite Element, back-fire side Temperature difference is calculated and water-cooling wall localized heat is negative
The relationship of lotus.Using back side temperature difference measuring point, slagging area is determined indirectly, but this method only limits laboratory research, not yet actually
Using, can not determine whether be suitble to power station operation.When occurring contamination, slagging in burner hearth, the caloric receptivity of water-cooling wall is reduced, burner hearth
Smoke temperature is exported to increase.After burner hearth soot blowing, furnace outlet gas temperature is remarkably decreased, and is hereafter gradually risen again with the increase of contamination, until
Soot blowing next time.Therefore, the variation of furnace outlet gas temperature can on the whole in reacting furnace Slagging feature, it is external almost
All slagging monitoring systems are all in this, as main or important auxiliary diagnosis means, although method achieves preferably on this
Achievement, but quantitative analysis is not carried out to Boiler Furnace slagging contamination, it can not accomplish accurately to instruct soot blowing.
Burning is a complicated turbulent flow, heat transfer and the three dimensional process of burning in Boiler Furnace.Due to the complexity of process
Property and coal-fired boiler fuel variability, so far, design to boiler and operation lack mature theory and experience, past
Toward coldandtest is needed to determine operation and design parameter, this kind of test period is long, costly, and hardly results in complete
Face, satisfaction data.
Summary of the invention
The purpose of the invention is to provide a kind of Boiler Furnace slagging thickness judgment method based on numerical simulation, based on online
Monitoring parameters diagnose dust deposit in furnace slagging state indirectly.
To achieve the goals above, the present invention proposes a kind of Boiler Furnace slagging thickness judgment method based on numerical simulation, packet
Include following steps:
Step A: by burner hearth data inputting model, the burner hearth is subjected to region division, and the duty parameter root in each region
Set according to actual conditions, by it is upper under successively include soot blower area, burner region and dry bottom hopper area, the dry bottom hopper area be in back taper
Shape, the burner hearth is interior to be equipped with primary air nozzle and overfiren air port；
Step B: grid dividing is carried out to the burner hearth using Gambit software, the grid of the burner region nozzle is adopted
It is divided with Paving method, i.e., the grid of the described burner region is all more intensive than the grid in the soot blower area and dry bottom hopper area；
Step C: carrying out numerical simulation in FLUENT software, sets multinomial condition model, sets multiple analog algorithm；
Step D: real data when actual condition in burner hearth is collected in detection, and the real data includes each spout in burner hearth
Entrance boundary condition；The real data is imported in the simulation algorithm, flame combustion temperature T is obtainedhy；
Step E: by the first thermodynamic computing formula, when calculating acquisition duty parameter cleaning water-cooling wall is 0mm slagging thickness,
The wall temperature t of the cleaning water-cooling wallw；
Step F: by the wall temperature t of the cleaning water-cooling wallwIt imports in the simulation algorithm, obtains as entrance boundary condition
The reference data and the real data are carried out Experimental comparison, judge the accuracy of the simulation algorithm by reference data；
If the simulation algorithm is not accurate, step C is repeated；
If the simulation algorithm is accurate, G is entered step；
Step G: by the reference data and the flame combustion temperature ThyIt substitutes into the second thermodynamic computing formula, calculating obtains
Duty parameter when to stain water-cooling wall be n mm slagging thickness, the wall temperature for staiing water-cooling wall stains water-cooling wall for described
Wall temperature imports in the simulation algorithm as entrance boundary condition, obtains wall temperature data when duty parameter difference slagging thickness；
Step H: wall temperature data when by the duty parameter difference slagging thickness carry out formula fitting, obtain slagging thickness
With the relational expression of furnace outlet gas temperature.
Further, in the Boiler Furnace slagging thickness judgment method described based on numerical simulation, the condition model: gas
Phase turbulent flow uses Realizable K- two-equation model, and Gas-solid Two-phase Flow is using Lagrangian stochastic particle track mould
Type.Radiant heat transfer uses P-1 model, and gas phase turbulance burning uses Hybrid analysis method probability density estimation, Volatile
Using two-step competitive reaction model, coke burning uses diffusion-dynamic Control combustion model；
The simulation algorithm: the numerical simulation uses three-dimensional steady state algorithm, and differential equation discretization uses finite volume
Method solves governing equation and uses SIMPLE algorithm.
Further, in the Boiler Furnace slagging thickness judgment method described based on numerical simulation, the entrance boundary item
Part includes the wind-warm syndrome of the wind speed of primary air nozzle, the wind-warm syndrome of primary air nozzle, the wind speed of overfiren air port and overfiren air port.
Further, in the Boiler Furnace slagging thickness judgment method described based on numerical simulation, the reference data packet
Include speed field data and temperature field data.
Further, in the Boiler Furnace slagging thickness judgment method described based on numerical simulation, in step G, by institute
State temperature field data and the flame combustion temperature ThyIt substitutes into the second thermodynamic computing formula, calculates and obtain duty parameter contamination water
When cold wall is 1mm slagging thickness, the wall temperature for staiing water-cooling wall, using the wall temperature for staiing water-cooling wall as entrance boundary item
Part imports in the simulation algorithm, obtains profiling temperatures when duty parameter contamination water-cooling wall is 1mm slagging thickness；Analogize
Above-mentioned calculation, obtain duty parameter stain water-cooling wall be 0~10,15,20,25 and 30mm totally 15 slagging thickness when temperature
Spend distribution situation.
Further, in the Boiler Furnace slagging thickness judgment method described based on numerical simulation, the first heating power meter
Calculate formula are as follows:
tw: clean the wall temperature of water-cooling wall；
T: medium temperature in managing；
JN: pipe peripherally thermic load highest point inner wall current stabilizing factor；
αN: surface coefficient of heat transfer of the tube wall to medium；
β: water-cooling wall caliber ratio；
Q: tube outer wall highest thermic load；
Pipe peripherally inner wall average flow rate current stabilizing factor；
λ: tubing thermal conductivity；
Further, in the Boiler Furnace slagging thickness judgment method described based on numerical simulation, the second heating power meter
Calculate formula are as follows:
σ0: radiation constant；
εl: furnace emissivity；
Thy: flame combustion temperature；
Thb: stain the wall temperature of water-cooling wall；
αhy: convection transfer rate of the flame to lime-ash surface；
δh: lime-ash thickness；
λh: lime-ash thermal coefficient；
Tgb: water-cooling wall metal tube mean temperature；
Compared with prior art, the beneficial effects are mainly reflected as follows: with the overcritical Process In A Tangential Firing of certain 300MW
For, the thermodynamic computing of numerical simulation and boiler is combined, the variation probed between furnace outlet gas temperature and slagging thickness is closed
System, instructs accurate soot blowing.Based on on-line monitoring parameter, the on-line checking for directly or indirectly diagnosing dust deposit in furnace slagging diagnoses skill
Art.Accurate Prediction dust stratification thickness, appropriate action soot blower blow away in time lime-ash.
Detailed description of the invention
Fig. 1 is the chamber structure of the middle typing model of the Boiler Furnace slagging thickness judgment method based on numerical simulation in the present invention
Schematic diagram；
Fig. 2 is the cross-sectional structure schematic diagram of burner hearth in Fig. 1；
Fig. 3 is the grid distribution schematic diagram of Fig. 1；
Fig. 4 is the grid distribution schematic diagram of Fig. 2；
The real data of entrance boundary condition when Fig. 5 is actual condition in burner hearth.
Wherein: soot blower area 1, burner region 2, dry bottom hopper area 3, primary air nozzle 41, overfiren air port 42.
Specific embodiment
The Boiler Furnace slagging thickness judgment method of the invention based on numerical simulation is carried out below in conjunction with schematic diagram more detailed
Thin description, which show the preferred embodiment of the present invention, it should be appreciated that those skilled in the art can modify and be described herein
The present invention, and still realize advantageous effects of the invention.Therefore, following description should be understood as those skilled in the art
Member's is widely known, and is not intended as limitation of the present invention.
In the description of the present invention, it should be noted that " transverse direction ", " vertical if any term " center " for the noun of locality
To ", " length ", " width ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top",
The indicating positions such as "bottom", "inner", "outside", " clockwise ", " counterclockwise " and positional relationship are orientation based on the figure or position
Relationship is set, the narration present invention is merely for convenience of and simplifies description, rather than the device or element of indication or suggestion meaning are necessary
It constructs and operates with specific orientation, with particular orientation, should not be understood as limiting specific protection scope of the invention.
In addition, being used for description purposes only if any term " first ", " second ", it is not understood to indicate or imply relatively heavy
The property wanted or the quantity for implicitly indicating technical characteristic." first " is defined as a result, " second " feature can be expressed or implicit include
One or more this feature, in the present description, " at least " are meant that one or more, unless otherwise clearly having
The restriction of body.
In the present invention, except as otherwise clear stipulaties and restriction, should make if any term " assembling ", " connected ", " connection " term
Broad sense goes to understand, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It is also possible to mechanical connect
It connects；It can be directly connected, be also possible to be connected by intermediary, can be and be connected inside two elements.For ability
For the those of ordinary skill of domain, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In invention, unless otherwise specified and limited, fisrt feature second feature "upper" or "lower" may include
First and second features directly contact, also may include fisrt feature and second feature be not direct contact but by them it
Between other characterisation contact.Moreover, fisrt feature second feature " on ", " under " and " above " include fisrt feature
Right above two features and oblique upper, or be only to indicate that first feature horizontal height is higher than the height of second feature.Fisrt feature
Second feature " on ", " under " and " below " include that fisrt feature is directly under or diagonally below the second feature, or only table
Show first feature horizontal height lower than second feature.
The present invention is more specifically described by way of example referring to attached drawing in the following passage.According to following explanation, the present invention
The advantages of and feature will become apparent from.It should be noted that attached drawing is all made of very simplified form and uses non-accurate ratio,
Only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention.
The present invention proposes a kind of Boiler Furnace slagging thickness judgment method based on numerical simulation, includes the following steps:
Step A: as shown in Figure 1 to Figure 2, by burner hearth data inputting model, the burner hearth is subjected to region division, and each area
The duty parameter in domain is set according to actual conditions, by it is upper under successively include soot blower area 1, burner region 2 and dry bottom hopper area 3,
And soot blower area 1 and burner region 2 divide multiple stratum regions, the ash fouling degree to guarantee different zones is inconsistent, symbol
Close actual conditions.The dry bottom hopper area 3 is in inverted cone shape, is equipped with primary air nozzle 41 and overfiren air port 42 in the burner hearth；
Step B: as shown in Figure 3 to Figure 4, using Gambit software to the burner hearth carry out grid dividing, gas flow with
Grid direction fitting, to reduce the error that pseudo- diffusion generates.The grid of 2 nozzle of burner region is carried out using Paving method
It divides, 2 domain spout of burner region is more, structure is complicated, and combustion reaction is violent, for the computational convergence for guaranteeing this region, the combustion
The grid in burner area 2 is all more intensive than the grid in the soot blower area 1 and dry bottom hopper area 3；Consider result precision and calculator performance,
Burner hearth uses SST hexahedral meshes, and grid number is 1,290,000 in burner hearth.
Step C: carrying out numerical simulation in FLUENT software, sets multinomial condition model, and gas-phase turbulent flow uses
Realizable K- two-equation model, Gas-solid Two-phase Flow is using Lagrangian stochastic particle model trajectory.Radiant heat transfer uses
P-1 model, gas phase turbulance burning use Hybrid analysis method probability density estimation, and Volatile uses two-step competitive reaction
Model, coke burning use diffusion-dynamic Control combustion model；Multiple analog algorithm is set, the numerical simulation is using three-dimensional
Steady-state algorithm, differential equation discretization use Finite Volume Method for Air, solve governing equation and use SIMPLE algorithm.
Step D: as shown in figure 5, detecting real data when collecting actual condition in burner hearth, the real data from power plant
Entrance boundary condition including spout each in burner hearth, the i.e. wind speed of primary air nozzle 41, the wind-warm syndrome of primary air nozzle 41, overfiren air port 42
Wind speed and overfiren air port 42 wind-warm syndrome.The real data is imported and carries out simulation algorithm calculating in the FLUENT software,
Obtain flame combustion temperature Thy；
Step E: by the first thermodynamic computing formula, when calculating acquisition duty parameter cleaning water-cooling wall is 0mm slagging thickness,
The wall temperature t of the cleaning water-cooling wallw；
First thermodynamic computing formula are as follows:
tw: clean the wall temperature of water-cooling wall；
T: medium temperature in managing；
JN: pipe peripherally thermic load highest point inner wall current stabilizing factor；
αN: surface coefficient of heat transfer of the tube wall to medium；
β: water-cooling wall caliber ratio；
Q: tube outer wall highest thermic load；
Pipe peripherally inner wall average flow rate current stabilizing factor；
λ: tubing thermal conductivity；
Step F: by the wall temperature t of the cleaning water-cooling wallwIt is imported in FLUENT software as entrance boundary condition and carries out mould
Quasi- algorithm calculates, and obtains speed field data and temperature field data, by the speed field data and temperature field data respectively with it is described
Real data carries out Experimental comparison, judges the accuracy of simulation algorithm in the FLUENT software；
If the simulation algorithm is not accurate, step C is repeated；
If the simulation algorithm is accurate, G is entered step；
Step G: by the temperature field data and the flame combustion temperature ThyIt substitutes into the second thermodynamic computing formula, calculates
When acquisition duty parameter contamination water-cooling wall is 1mm slagging thickness, the wall temperature for staiing water-cooling wall, by the contamination water-cooling wall
Wall temperature imports as entrance boundary condition and carries out simulation algorithm calculating in the FLUENT software, obtains duty parameter and stains water cooling
Profiling temperatures when wall is 1mm slagging thickness；Analogize above-mentioned calculation, obtain duty parameter stain water-cooling wall be 0~
10,15,20,25 and 30mm totally 15 slagging thickness when profiling temperatures.
The second thermodynamic computing formula are as follows:
σ0: radiation constant；
εl: furnace emissivity；
Thy: flame combustion temperature；
Thb: stain the wall temperature of water-cooling wall；
αhy: convection transfer rate of the flame to lime-ash surface；
δh: lime-ash thickness；
λh: lime-ash thermal coefficient；
Tgb: water-cooling wall metal tube mean temperature；
Step H: wall temperature data when by the duty parameter difference slagging thickness carry out formula fitting, obtain slagging thickness
With the relational expression of furnace outlet gas temperature.
In practical applications, by the measurement to furnace outlet gas temperature data, the slagging being calculated in conjunction with the present invention is thick
Degree and the relational expression of furnace outlet gas temperature, calculate the real-time slagging thickness for obtaining heating surface indirectly, in order to control soot blower into
The accurate soot blowing of row.
To sum up, in the present embodiment, the Boiler Furnace slagging thickness judgment method based on numerical simulation of proposition, with certain 300MW
For overcritical Process In A Tangential Firing, the thermodynamic computing of numerical simulation and boiler is combined, probes into furnace outlet gas temperature and knot
Variation relation between slag thickness instructs accurate soot blowing.Based on on-line monitoring parameter, dust deposit in furnace knot is directly or indirectly diagnosed
The on-line checking diagnostic techniques of slag.Accurate Prediction dust stratification thickness, appropriate action soot blower blow away in time lime-ash.
The above is only a preferred embodiment of the present invention, does not play the role of any restrictions to the present invention.Belonging to any
Those skilled in the art, in the range of not departing from technical solution of the present invention, to the invention discloses technical solution and
Technology contents make the variation such as any type of equivalent replacement or modification, belong to the content without departing from technical solution of the present invention, still
Within belonging to the scope of protection of the present invention.
Claims (7)
1. a kind of Boiler Furnace slagging thickness judgment method based on numerical simulation, which comprises the steps of:
Step A: by burner hearth data inputting model, the burner hearth is subjected to region division, and the duty parameter in each region is according to reality
Border situation setting, by it is upper under successively include soot blower area, burner region and dry bottom hopper area, the dry bottom hopper area be in inverted cone shape,
Primary air nozzle and overfiren air port are equipped in the burner hearth；
Step B: grid dividing is carried out to the burner hearth using Gambit software, the grid of the burner region nozzle uses
Paving method is divided, i.e., the grid of the described burner region is all more intensive than the grid in the soot blower area and dry bottom hopper area；
Step C: carrying out numerical simulation in FLUENT software, sets multinomial condition model, sets multiple analog algorithm；
Step D: real data when actual condition in burner hearth is collected in detection, the real data include in burner hearth each spout enter
Mouth boundary condition；The real data is imported in the simulation algorithm, flame combustion temperature T is obtainedhy；
Step E: described when calculating acquisition duty parameter cleaning water-cooling wall is 0mm slagging thickness by the first thermodynamic computing formula
Clean the wall temperature t of water-cooling wallw；
Step F: by the wall temperature t of the cleaning water-cooling wallwIt imports in the simulation algorithm, is referred to as entrance boundary condition
The reference data and the real data are carried out Experimental comparison, judge the accuracy of the simulation algorithm by data；
If the simulation algorithm is not accurate, step C is repeated；
If the simulation algorithm is accurate, G is entered step；
Step G: by the reference data and the flame combustion temperature ThyIt substitutes into the second thermodynamic computing formula, calculates and obtain work
When condition parameter contamination water-cooling wall is n mm slagging thickness, the wall temperature for staiing water-cooling wall, by the wall temperature for staiing water-cooling wall
It is imported in the simulation algorithm as entrance boundary condition, obtains wall temperature data when duty parameter difference slagging thickness；
Step H: wall temperature data when by the duty parameter difference slagging thickness carry out formula fitting, obtain slagging thickness and furnace
The relational expression of thorax outlet smoke temperature.
2. the Boiler Furnace slagging thickness judgment method according to claim 1 based on numerical simulation, which is characterized in that the item
Part model: gas-phase turbulent flow uses RealizableK- two-equation model, and Gas-solid Two-phase Flow is using Lagrange random
Grain model trajectory.Radiant heat transfer uses P-1 model, and gas phase turbulance burning uses Hybrid analysis method probability density estimation, waves
Hair is analyzed using two-step competitive reaction model, and coke burning uses diffusion-dynamic Control combustion model；
The simulation algorithm: the numerical simulation uses three-dimensional steady state algorithm, and differential equation discretization uses Finite Volume Method for Air, asks
It solves governing equation and uses SIMPLE algorithm.
3. the Boiler Furnace slagging thickness judgment method according to claim 1 based on numerical simulation, which is characterized in that it is described enter
Mouth boundary condition includes the wind-warm syndrome of the wind speed of primary air nozzle, the wind-warm syndrome of primary air nozzle, the wind speed of overfiren air port and overfiren air port.
4. the Boiler Furnace slagging thickness judgment method according to claim 1 based on numerical simulation, which is characterized in that the ginseng
Examining data includes velocity field data and temperature field data.
5. the Boiler Furnace slagging thickness judgment method according to claim 4 based on numerical simulation, which is characterized in that in step
In G, by the temperature field data and the flame combustion temperature ThyIt substitutes into the second thermodynamic computing formula, calculates and obtain operating condition ginseng
Number stains water-cooling wall when being 1mm slagging thickness, the wall temperature for staiing water-cooling wall, using the wall temperature for staiing water-cooling wall as entering
Mouth boundary condition imports in the simulation algorithm, obtains Temperature Distribution when duty parameter contamination water-cooling wall is 1mm slagging thickness
Situation；Analogize above-mentioned calculation, obtaining duty parameter and staiing water-cooling wall is 0~10,15,20,25 and 30mm totally 15 slagging
Profiling temperatures when thickness.
6. the Boiler Furnace slagging thickness judgment method according to claim 1 based on numerical simulation, which is characterized in that described
One thermodynamic computing formula are as follows:
tw: clean the wall temperature of water-cooling wall；
T: medium temperature in managing；
JN: pipe peripherally thermic load highest point inner wall current stabilizing factor；
αN: surface coefficient of heat transfer of the tube wall to medium；
β: water-cooling wall caliber ratio；
Q: tube outer wall highest thermic load；
Pipe peripherally inner wall average flow rate current stabilizing factor；
λ: tubing thermal conductivity.
7. the Boiler Furnace slagging thickness judgment method according to claim 1 based on numerical simulation, which is characterized in that described
Two thermodynamic computing formula are as follows:
σ0: radiation constant；
εl: furnace emissivity；
Thy: flame combustion temperature；
Thb: stain the wall temperature of water-cooling wall；
αhy: convection transfer rate of the flame to lime-ash surface；
δh: lime-ash thickness；
λh: lime-ash thermal coefficient；
Tgb: water-cooling wall metal tube mean temperature.
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| CN109829189B (en) | 2023-04-14 |
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