CN103235842B - The acquisition methods of quadrangle tangential circle coal-fired boiler combustion characteristic and system - Google Patents
The acquisition methods of quadrangle tangential circle coal-fired boiler combustion characteristic and system Download PDFInfo
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000004088 simulation Methods 0.000 claims abstract description 53
- 230000005855 radiation Effects 0.000 claims abstract description 30
- 239000002817 coal dust Substances 0.000 claims abstract description 23
- 238000012546 transfer Methods 0.000 claims abstract description 21
- 238000004422 calculation algorithm Methods 0.000 claims abstract description 15
- 239000003245 coal Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 208000011580 syndromic disease Diseases 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 16
- 238000009792 diffusion process Methods 0.000 description 10
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- 238000002474 experimental method Methods 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 6
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- 230000009466 transformation Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
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- 238000010304 firing Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000013316 zoning Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The present invention discloses a kind of acquisition methods of quadrangle tangential circle coal-fired boiler combustion characteristic, comprising: the structural parameters according to quadrangle tangential circle coal-burning boiler carry out stress and strain model to boiler, set up the full scale model of described boiler; Obtain burner parameter, boundary condition parameter, the coal dust parameter of boiler; Employing can realize the simulation of k-ε two-equation model obtain described boiler turbulent flow model, adopt the simulation of probability density combustion model obtain described boiler gas phase turbulance combustion model, adopt SIMPLE algorithm simulation obtain described boiler velocity field model, adopt the simulation of P-1 radiation patterns to obtain the radiation heat-transfer model of described boiler; Export the turbulent flow model of described boiler, gas phase turbulance combustion model, velocity field model, radiation heat-transfer model.The present invention accordingly also discloses a kind of acquisition system of quadrangle tangential circle coal-fired boiler combustion characteristic.The present invention can combustion conditions in accurate description boiler, and its boiler combustion numerical precision obtained is higher, reliable results.
Description
Technical field
The present invention relates to coal-burning boiler technical field, particularly relate to a kind of acquisition methods of quadrangle tangential circle coal-fired boiler combustion characteristic, and a kind of acquisition system of quadrangle tangential circle coal-fired boiler combustion characteristic.
Background technology
China is one is the country of main primary energy with coal.Current coal in China production occupies first place in the world, accounts for 75.3% of total energy consumption.Although along with the development of energy utilization technology, the new energy and regenerative resource will continue to increase, and the consumption proportion of coal can decline gradually, and its total amount still can rise.Estimated before the year two thousand fifty, predict that its proportion will still more than 55%.As the power industry of national economic development guide, the same dominate of China's coal fired power plant, installed capacity and the generated energy at Coal-fired Thermal Power station all account for more than 80%, even if estimate the ratio of coal fired power generation by 2015 still up to 75%.
But it is high to there is pollutant emission in current station boiler, the problems such as unit generated energy coal consumption is higher.China's energy-consuming accounts for 8% ~ 9% of the world, but SO
2discharge accounts for 15.1%, NO of the world
xaccount for 10.1%, CO
2account for 13.2%.Wherein, the SO that discharges of China's coal combustion
2account for 85%, CO of the total discharge in the whole nation
2account for 85%, NO
xaccount for 60%, dust accounts for 70%.Acid rain region oneself exceed 40% of area.Therefore, the realization of improvement to China's " energy-saving and emission-reduction " target of station boiler plays decisive role.
And want to improve station boiler, just must understand the combustion characteristics of boiler, and pollutant emission rule and influence factor thereof.Therefore domestic in the urgent need to relevant experimental study.But due to a series of reasons such as station boiler volume are large, combustion conditions is complicated, experiment condition is severe, experimental period is long, occupied fund is large, traditional means of experiment is difficult to the boiler experiment of completion system.And the experimental technique of numerical simulation opens new experiment direction.The experimental technique of numerical simulation to be a kind of with computing machine be major experimental equipment, there is the series of advantages such as experimental facilities floor area is little, requirement for experiment condition is simple, experimental period is short, occupied fund is few, result is more accurate, therefore cause the extensive concern of Chinese scholars.
By numerical simulation, we can obtain the combustion conditions of station boiler inside more accurately.By the analysis to combustion conditions, the position of the distribution of the burning efficiency of boiler, furnace heat transfer coefficient, temperature field in furnace and airflow field, the easily easy coking of slagging scorification can be learnt more accurately and affect the principal element of boiler combustion, and then for improving boiler thermal output, provide theoretical foundation for reducing unit generated energy coal consumption.
But up to the present, the numerical value obtaining boiler furnace combustion operating mode still has many weak points, in boiler furnace, the combustion process of coal dust relates to a lot of problem of flowing, heat transfer, phase transformation, Multiphase Flow, combustion chemistry reaction etc. in heat energy field, different theoretical model emphasis is different, especially for corner tangential firing pulverized coal firing boiler, its complex structure, coal dust change is frequent, carrying out in combustion conditions simulation to it, because equation number is many, easily disperse, its numerical simulation is very difficult, and computational solution precision is poor.
Summary of the invention
Based on this, the invention provides a kind of acquisition methods and system of quadrangle tangential circle coal-fired boiler combustion characteristic, its boiler combustion numerical precision obtained is higher, reliable results.
An acquisition methods for quadrangle tangential circle coal-fired boiler combustion characteristic, comprises the steps:
Structural parameters according to quadrangle tangential circle coal-burning boiler carry out stress and strain model to described boiler, set up the full scale model of described boiler;
Obtain the burner parameter of described boiler, boundary condition parameter, coal dust parameter;
According to full scale model, burner parameter, boundary condition parameter, the coal dust parameter of described boiler, adopt can realize the simulation of k-ε two-equation model obtain described boiler turbulent flow model, adopt the simulation of probability density combustion model obtain described boiler gas phase turbulance combustion model, adopt SIMPLE algorithm simulation obtain described boiler velocity field model, adopt the simulation of P-1 radiation patterns to obtain the radiation heat-transfer model of described boiler;
Export the turbulent flow model of described boiler, gas phase turbulance combustion model, velocity field model, radiation heat-transfer model.
An acquisition system for quadrangle tangential circle coal-fired boiler combustion characteristic, comprising:
Set up module, for the structural parameters according to quadrangle tangential circle coal-burning boiler, stress and strain model is carried out to described boiler, set up the full scale model of described boiler;
Acquisition module, for obtaining burner parameter, boundary condition parameter, the coal dust parameter of described boiler;
Analog module, for the full scale model according to described boiler, burner parameter, boundary condition parameter, coal dust parameter, adopt can realize the simulation of k-ε two-equation model obtain described boiler turbulent flow model, adopt the simulation of probability density combustion model obtain described boiler gas phase turbulance combustion model, adopt SIMPLE algorithm simulation obtain described boiler velocity field model, adopt the simulation of P-1 radiation patterns to obtain the radiation heat-transfer model of described boiler;
Output module, for exporting turbulent flow model, gas phase turbulance combustion model, velocity field model, the radiation heat-transfer model of described boiler.
The acquisition methods of above-mentioned quadrangle tangential circle coal-fired boiler combustion characteristic and system, according to the feature of quadrangle tangential circle coal-burning boiler, the full scale model of boiler is generated after stress and strain model is carried out to it, adopt according to the full scale model of this boiler and can realize the turbulent flow model that the simulation of k-ε two-equation model obtains described boiler, the simulation of probability density combustion model is adopted to obtain the gas phase turbulance combustion model of described boiler, SIMPLE algorithm simulation is adopted to obtain the velocity field model of described boiler, the simulation of P-1 radiation patterns is adopted to obtain the radiation heat-transfer model of described boiler, selecting above-mentioned model to carry out numerical simulation can combustion conditions in accurate description boiler, its boiler combustion numerical precision obtained is higher, reliable results.
Accompanying drawing explanation
Fig. 1 is the acquisition methods schematic flow sheet in one embodiment of quadrangle tangential circle coal-fired boiler combustion characteristic of the present invention.
Fig. 2 is the schematic diagram of cross section, burner region grid in Fig. 1.
Fig. 3 is the grid schematic diagram of quadrangle tangential circle coal-burning boiler in Fig. 1.
Fig. 4 is the acquisition system structural representation in one embodiment of quadrangle tangential circle coal-fired boiler combustion characteristic of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
As shown in Figure 1, be the acquisition methods schematic flow sheet in one embodiment of quadrangle tangential circle coal-fired boiler combustion characteristic of the present invention, comprise the steps:
S11, according to the structural parameters of quadrangle tangential circle coal-burning boiler, stress and strain model is carried out to described boiler, set up the full scale model of described boiler;
Combustion conditions in acquisition boiler, carry out in numerical simulation calculation process, boiler is carried out the full scale model that stress and strain model sets up boiler, namely carry out discrete to the zoning of Spatial continual, it is divided into many subregions, and determines the node in each region.The levels of precision of numerical result and the efficiency of computation process, the impact by mesh quality is very large.Only have when the generation of grid and the algorithm that solves flow field well mate, just can succeed and result of calculation efficiently.
In a preferred embodiment, the described structural parameters according to quadrangle tangential circle coal-burning boiler specifically comprise the step that described boiler carries out stress and strain model:
11a, according to the structural parameters of quadrangle tangential circle coal-burning boiler, boiler is divided multiple region along its furnace height direction, generate the section of burner hearth grid in each region;
Wherein, described the step that boiler is cut into multiple region along its furnace height direction to be specially:
Described boiler is divided into furnace hopper district, lower hearth district, burner region, upper furnace district, lower foldede flame angle district, upper furnace arch, furnace nose district and outlet area from low to high along boiler furnace height;
Wherein, for described burner region, the generation of its volume mesh adopts Cooper method, and its cross section grid adopts Quadratic grid cell and Pave method to divide, and the direction that the cross section grid of described burner region and air-flow enter described cross section grid is vertical;
11b, to extend along furnace height, utilize the grid cutting method preset respectively each region to be carried out to the generation of volume mesh, obtain the full scale model of described boiler;
Due to quadrangle tangential circle coal-burning boiler complex structure, stress and strain model was carried out not at that time to boiler, false diffusion can be produced; False diffusion refers to that the truncation error of the discrete scheme of first order derivative item (convective term) in convective-diffusive equation is less than second order and causes the phenomenon of the bigger numerical error of calculation.Because the first term of this discrete scheme intercept includes second derivative, the effect of spreading in numerical result is exaggerated artificially, is equivalent to introduce pseudo-viscosity or numerical viscosity.Except the first order derivative of astable item and convective term is discrete can cause false diffusion except, following two reasons also can cause false diffusion: flow direction and mesh lines are tilt to intersect; The impact of the source item of non-constant is not considered when setting up discrete scheme.
Be divided into 7 parts to carry out stress and strain model in whole boiler in the present embodiment, these 7 parts respectively: furnace hopper district, lower hearth district, burner region, upper furnace district, lower foldede flame angle district, upper furnace arch, furnace nose district, and outlet area.Except burner region is overseas, each several part grid method of drawing is consistent substantially, reduces error.
And for burner cross section, because air-flow approach axis and burner wall have certain angle (being about 45 °), subsurface gridding and air-flow must be made to enter the direction of cross section grid vertical, therefore adopt Quadratic grid cell and Pave method to divide cross section to burner region, adopt Cooper method to divide integral burner region.Division result as shown in Figure 2, can be encrypted for the grid of furnace arch, furnace nose near zone meanwhile.Whole visible Fig. 3 of boiler stress and strain model schematic diagram in the present embodiment.
S12, obtain burner parameter in described boiler, boundary condition parameter, coal dust parameter;
Wherein, described burner parameter comprises wind speed, wind-warm syndrome, hydraulic radius, the injection source parameter of spout; Described boundary condition parameter comprises wall surface temperature, wall material, flue outlet parameter; Described coal dust parameter comprises coal elemental composition and content thereof;
S13, the full scale model according to described boiler, burner parameter, boundary condition parameter, coal dust parameter, adopt can realize the simulation of k-ε two-equation model obtain described boiler turbulent flow model, adopt the simulation of probability density combustion model obtain described boiler gas phase turbulance combustion model, adopt SIMPLE algorithm simulation obtain described boiler velocity field model, adopt the simulation of P-1 radiation patterns to obtain the radiation heat-transfer model of described boiler.
Mainly apply FLUENT software at boiler industry and solve the problem such as flowing, heat transfer, phase transformation, Multiphase Flow, combustion chemistry reaction in Thermal Power Engineering professional domain, the flowing that each can be disperseed, burning, heat trnasfer and particles diffusion scheduling theory model are intactly coupled, and comprehensively simulate stove combustion process;
Provide separate type and manifold type two class solver in FLUENT, and manifold type is divided into implicit expression and explicit two kinds;
Separate type solver (segregatedsolver) solves each equation (equation about u, v, w, p and T) sequentially, seriatim, after namely first solving an equation (as the u equation of momentum) on total-grid, then separate another one equation (as the v equation of momentum).Because governing equation is nonlinear, and be coupling each other, therefore, before obtaining convergence solution, through too much taking turns iteration.
Manifold type solver (coupledsolver) is the coupled wave equation simultaneously solving continuity equation, the equation of momentum, energy equation and component transport equation, then, then solves turbulent flow equiscalar equation seriatim.Because governing equation is nonlinear, and be coupling each other, therefore, before obtaining convergence solution, through 2 iteration.
Two kinds of solvers are all applicable to from being pressed onto a wide range of flowing can pressed at a high speed, but generally, when calculate at a high speed can baric flow move time, manifold type solver has more advantage.Manifold type solver usually can very rapid convergence, but required internal memory is approximately 1.5 to 2 times of separate type solver.In addition, the several physical models provided in separate type solver, do not have in manifold type solver.These physical models comprise: the cycle flow model of fluid volume model (VOF), multiphase mixture model, Euler's mixture model, probability density (PDF, ProbabilityDensityFunction) combustion model, pre-mixing combustion model, given mass flow, cyclical heat conduction model and shell conduction model etc.; Use the gas phase turbulance combustion model of PDF combustion model simulation boiler in the present embodiment.
The basic thought of SIMPLE algorithm can be described below: for given pressure field, (it can be the value of supposition, or the result that obtains of last iterative computation), solve the equation of momentum of discrete form, draw velocity field, therefore, must given pressure field be revised.The principle revised is: the speed field energy corresponding with revised pressure field meets the continuity equation on this iteration level.Principle accordingly, we substitute into the discrete form of continuity equation the relation of the pressure of the discrete form defined by the equation of momentum and speed, thus obtain pressure correction equation, draw pressure correction value by pressure correction equation.Then, according to revised pressure field, new velocity field is tried to achieve.Then check whether velocity field restrains.If do not restrain, by revised force value as given pressure field, start the calculating of next level.So repeatedly, until obtain the solution of convergence.SIMPLE algorithm has speed of convergence faster, for steady state problem, selects SIMPLE serial algorithm to have advantage, adopts SIMPLE algorithm simulation to obtain the velocity field model of described boiler in the present embodiment.
Adopt in the present embodiment and can realize the turbulent flow model that the simulation of k-ε two-equation model obtains described boiler, the advantage that can realize k-ε two-equation model (Realizablek-ε model) has:
(1) turbulent viscosity computing formula there occurs change, introduces and rotates the content relevant with curvature:
(2) ε equation there occurs great changes, and the generation item in equation no longer includes the generation item G in k equation
k, the energy conversion of spectrum can be represented better.
(3) item second from the bottom in ε equation does not have any singularity, even if k value is very little or be zero, denominator also can not be zero.This and standard k-ε model and RNGk-ε model have very large difference.
(4) Realizablek-ε model can be effectively applied to various dissimilar flow simulating, comprise rotate uniform shear flow, include the flowing freely of jet and mixed flow, flowing in pipeline, boundary-layer flow, and be with separative flowing etc.
The simulation of P-1 radiation patterns is adopted to obtain the radiation heat-transfer model of described boiler in the present embodiment; Radiation environment evaluation in P-1 radiation patterns is one and calculates relatively little diffusion equation, and contain scattering effect in model, in the computational problem that the optical thicknesses such as burning are very large, the calculating effect of P-1 model is all relatively good simultaneously.
S14, the turbulent flow model exporting described boiler, gas phase turbulance combustion model, velocity field model, radiation heat-transfer model;
The turbulent flow model of the boiler obtained in step S13, gas phase turbulance combustion model, velocity field model, radiation heat-transfer model are exported, the numerical value completing quadrangle tangential circle coal-fired boiler combustion characteristic obtains.
Application process of the present invention is set forth below by a specific embodiment.
In the present embodiment, said method is adopted to carry out variable working condition simulation to quadrangle tangential circle coal-burning boiler, different numerical simulation results is obtained after changing wind speed and air coefficient, judge the control of firing correctional effect and pollutant emission again of boiler, in quadrangle tangential circle coal-burning boiler in the present embodiment, burner has four groups, is arranged in four diagonal angles.Often organize burner and divide six layers, be respectively two-layer First air, three layers of Secondary Air and one deck tertiary air.Primary and secondary air interval is arranged, tertiary air is arranged in topmost, and interval, each air port is identical, is 550mm.Angle between four groups of burner axial lines and boiler diagonal line is 4 ° 7 ', forms in burner hearth central authorities the counterclockwise circle of contact that diameter is 850mm.Its wind snout is vertical-type shade burner, and air port is concentrated phase to fiery side, and back-fire side is light phase.
Wherein, coal elemental composition massfraction is (%): C:81.26H:5.45O:11.27N:1.27S:0.7; Air quality mark is (%): N
2: 76.7O
2: 23.3.
Spout boundary condition is:
The component of muzzle velocity on each axle is:
Wall boundary condition: wall surface temperature is set to 684K, material is steel (steel), has reflex (reflect) to particle.
In the present embodiment, coal dust sliding velocity is set to 10% of gas velocity, namely coal dust speed is 90% of gas velocity.Grain diameter obeys rosin-rammler rule.
Injection source parameter is:
(1) in variable working condition simulation, contrast finds, along with the raising of wind speed, and the increase of excess air coefficient, stove inscribed circle radius and circle of contact center do not change, but circle of contact maximum wind velocity increases; Average temperature level in burner hearth and exit gas temperature decline all to some extent, and the increase of visible air total amount can reduce flue-gas temperature; When excess air coefficient is less, obvious rough burning phenomenon can be there is, therefore in boiler operatiopn and adjustment load process, larger excess air coefficient (α >1.2) should be ensured as far as possible; When excess air coefficient is lower, can low oxygen combustion be there is, reduce furnace outlet place NO concentration.When excess air coefficient is higher, unnecessary air can dilute NO, also makes NO concentration in furnace outlet place reduce.Although these two kinds of operating modes all reduce NO concentration, all inadvisable.
(2), after combustion is transformed again, totally there is not too large change gas stream in the stove field, but circle of contact radius and circle of contact maximum wind velocity constantly change along furnace height; Burner hearth medial temperature and furnace outlet place temperature all increase, and high-temperature region temperature decreases, but the distribution of whole fire box temperature is more even; CO after transformation in stove
2concentration increases, and CO concentration slightly improves, and O
2concentration decreases, this be spray into due to coal dust evenly, O
2utilization factor higher; Fire transformation again and can't affect coal dust burn-off rate;
(3) fire transformation again and can significantly reduce NO growing amount, but reduction numerical value does not reach predicted value, this may ascribe following three reasons to:
1. reburning zone excess air coefficient is unreasonable;
2. nozzle exit area is fired again on the low side;
3. this coal is caught fire partially late, is not suitable for making reburning fuel.
For the 1. improvement 2. of practicable problem, carried out follow-up study, result shows, when reburning zone excess air coefficient is 0.95, NOx emission reduction effect is best.Now NO concentration in furnace outlet place is 203mg/m
3; Be under the condition of 0.95 at reburning zone excess air coefficient, when firing spout again and being 1050mm apart from the height of upper overfire air port, NOx emission reduction effect is best, and now NO concentration in furnace outlet place is 196mg/m3, and emission reduction effect reaches 31.4%.
As shown in Figure 4, the present invention also discloses a kind of acquisition system of quadrangle tangential circle coal-fired boiler combustion characteristic, comprising:
Set up module 41, for the structural parameters according to quadrangle tangential circle coal-burning boiler, stress and strain model is carried out to described boiler, set up the full scale model of described boiler;
Combustion conditions in acquisition boiler, carry out in numerical simulation calculation process, boiler is carried out the full scale model that stress and strain model sets up boiler, namely carry out discrete to the zoning of Spatial continual, it is divided into many subregions, and determines the node in each region.The levels of precision of numerical result and the efficiency of computation process, the impact by mesh quality is very large.Only have when the generation of grid and the algorithm that solves flow field well mate, just can succeed and result of calculation efficiently.
In the present embodiment, described module of setting up can be specifically for:
Boiler is divided multiple region along its furnace height direction by the structural parameters according to quadrangle tangential circle coal-burning boiler, generates the section of burner hearth grid in each region;
Wherein, described boiler can be divided into furnace hopper district, lower hearth district, burner region, upper furnace district, lower foldede flame angle district, upper furnace arch, furnace nose district and outlet area from low to high along boiler furnace height; For described burner region, the generation of its volume mesh adopts Cooper method, and its cross section grid adopts Quadratic grid cell and Pave method to divide, and the direction that the cross section grid of described burner region and air-flow enter described cross section grid is vertical.
Extend along furnace height again, utilize the grid cutting method preset respectively each region to be carried out to the generation of volume mesh, obtain the full scale model of described boiler.
Due to quadrangle tangential circle coal-burning boiler complex structure, stress and strain model was carried out not at that time to boiler, false diffusion can be produced; False diffusion refers to that the truncation error of the discrete scheme of first order derivative item (convective term) in convective-diffusive equation is less than second order and causes the phenomenon of the bigger numerical error of calculation.Because the first term of this discrete scheme intercept includes second derivative, the effect of spreading in numerical result is exaggerated artificially, is equivalent to introduce pseudo-viscosity or numerical viscosity.Except the first order derivative of astable item and convective term is discrete can cause false diffusion except, following two reasons also can cause false diffusion: flow direction and mesh lines are tilt to intersect; The impact of the source item of non-constant is not considered when setting up discrete scheme.
Be divided into 7 parts to carry out stress and strain model in whole boiler in the present embodiment, these 7 parts respectively: furnace hopper district, lower hearth district, burner region, upper furnace district, lower foldede flame angle district, upper furnace arch, furnace nose district, and outlet area.Except burner region is overseas, each several part grid method of drawing is consistent substantially, reduces error.
And for burner cross section, because air-flow approach axis and burner wall have certain angle (being about 45 °), subsurface gridding and air-flow must be made to enter the direction of cross section grid vertical, therefore adopt Quadratic grid cell and Pave method to divide cross section to burner region, adopt Cooper method to divide integral burner region.
Acquisition module 42, for obtaining burner parameter in described boiler, boundary condition parameter, coal dust parameter; In the present embodiment, described burner parameter comprises wind speed, wind-warm syndrome, hydraulic radius, the injection source parameter of spout; Described boundary condition parameter comprises wall surface temperature, wall material, flue outlet parameter; Described coal dust parameter comprises coal elemental composition and content thereof.
Analog module 43, for the full scale model according to described boiler, burner parameter, boundary condition parameter, coal dust parameter, adopt can realize the simulation of k-ε two-equation model obtain described boiler turbulent flow model, adopt the simulation of probability density combustion model obtain described boiler gas phase turbulance combustion model, adopt SIMPLE algorithm simulation obtain described boiler velocity field model, adopt the simulation of P-1 radiation patterns to obtain the radiation heat-transfer model of described boiler;
Output module 44, for exporting turbulent flow model, gas phase turbulance combustion model, velocity field model, the radiation heat-transfer model of described boiler.
The acquisition methods of quadrangle tangential circle coal-fired boiler combustion characteristic of the present invention and system, according to the feature of quadrangle tangential circle coal-burning boiler, the full scale model of boiler is generated after stress and strain model is carried out to it, adopt according to the full scale model of this boiler and can realize the turbulent flow model that the simulation of k-ε two-equation model obtains described boiler, the simulation of probability density combustion model is adopted to obtain the gas phase turbulance combustion model of described boiler, SIMPLE algorithm simulation is adopted to obtain the velocity field model of described boiler, the simulation of P-1 radiation patterns is adopted to obtain the radiation heat-transfer model of described boiler, selecting above-mentioned model to carry out numerical simulation can combustion conditions in accurate description boiler, its boiler combustion numerical precision high value simulation precision obtained is higher, reliable results.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (4)
1. an acquisition methods for quadrangle tangential circle coal-fired boiler combustion characteristic, is characterized in that, comprises the steps:
Structural parameters according to quadrangle tangential circle coal-burning boiler carry out stress and strain model to described boiler, set up the full scale model of described boiler;
Obtain the burner parameter of described boiler, boundary condition parameter, coal dust parameter;
According to full scale model, burner parameter, boundary condition parameter, the coal dust parameter of described boiler, adopt can realize the simulation of k-ε two-equation model obtain described boiler turbulent flow model, adopt the simulation of probability density combustion model obtain described boiler gas phase turbulance combustion model, adopt SIMPLE algorithm simulation obtain described boiler velocity field model, adopt the simulation of P-1 radiation patterns to obtain the radiation heat-transfer model of described boiler;
Export the turbulent flow model of described boiler, gas phase turbulance combustion model, velocity field model, radiation heat-transfer model;
The described structural parameters according to quadrangle tangential circle coal-burning boiler specifically comprise the step that described boiler carries out stress and strain model:
Boiler is divided multiple region along its furnace height direction by the structural parameters according to quadrangle tangential circle coal-burning boiler, generates the section of burner hearth grid in each region;
Extend along furnace height, utilize the grid cutting method preset respectively each region to be carried out to the generation of volume mesh, obtain the full scale model of described boiler;
Described the step that boiler is cut into multiple region along its furnace height direction to be specially:
Described boiler is divided into furnace hopper district, lower hearth district, burner region, upper furnace district, lower foldede flame angle district, upper furnace arch, furnace nose district and outlet area from low to high along boiler furnace height; The Meshing Method in each district except burner region is consistent;
Wherein, for described burner region, the generation of its volume mesh adopts Cooper method, and its cross section grid adopts Quadratic grid cell and Pave method to divide, and the direction that the cross section grid of described burner region and air-flow enter described cross section grid is vertical.
2. the acquisition methods of quadrangle tangential circle coal-fired boiler combustion characteristic according to claim 1, is characterized in that, described burner parameter comprises wind speed, wind-warm syndrome, hydraulic radius, the injection source parameter of spout; Described boundary condition parameter comprises wall surface temperature, wall material, flue outlet parameter; Described coal dust parameter comprises coal elemental composition and content thereof.
3. an acquisition system for quadrangle tangential circle coal-fired boiler combustion characteristic, is characterized in that, comprising:
Set up module, for the structural parameters according to quadrangle tangential circle coal-burning boiler, stress and strain model is carried out to described boiler, set up the full scale model of described boiler;
Acquisition module, for obtaining burner parameter, boundary condition parameter, the coal dust parameter of described boiler;
Analog module, for the full scale model according to described boiler, burner parameter, boundary condition parameter, coal dust parameter, adopt can realize the simulation of k-ε two-equation model obtain described boiler turbulent flow model, adopt the simulation of probability density combustion model obtain described boiler gas phase turbulance combustion model, adopt SIMPLE algorithm simulation obtain described boiler velocity field model, adopt the simulation of P-1 radiation patterns to obtain the radiation heat-transfer model of described boiler;
Output module, for exporting turbulent flow model, gas phase turbulance combustion model, velocity field model, the radiation heat-transfer model of described boiler;
Described set up module specifically for:
Boiler is divided multiple region along its furnace height direction by the structural parameters according to quadrangle tangential circle coal-burning boiler, generates the section of burner hearth grid in each region;
Extend along furnace height, utilize the grid cutting method preset respectively each region to be carried out to the generation of volume mesh, obtain the full scale model of described boiler;
Described set up module also specifically for:
Described boiler is divided into furnace hopper district, lower hearth district, burner region, upper furnace district, lower foldede flame angle district, upper furnace arch, furnace nose district and outlet area from low to high along boiler furnace height; The Meshing Method in each district except burner region is consistent substantially;
Wherein, for described burner region, the generation of its volume mesh adopts Cooper method, and its cross section grid adopts Quadratic grid cell and Pave method to divide, and the direction that the cross section grid of described burner region and air-flow enter described cross section grid is vertical.
4. the acquisition system of quadrangle tangential circle coal-fired boiler combustion characteristic according to claim 3, is characterized in that, described burner parameter comprises wind speed, wind-warm syndrome, hydraulic radius, the injection source parameter of spout; Described boundary condition parameter comprises wall surface temperature, wall material, flue outlet parameter; Described coal dust parameter comprises coal elemental composition and content thereof.
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| CN106548032B (en) * | 2016-11-08 | 2019-04-05 | 沃森测控技术（河北）有限公司 | Based on boiler flue grid detection flue gas CO and O2The distribution field method for reconstructing of concentration |
| CN110263467A (en) * | 2019-06-26 | 2019-09-20 | 东北电力大学 | A kind of Process In A Tangential Firing numerical analysis method based on field coordination principle |
| CN110410819B (en) * | 2019-08-05 | 2021-04-27 | 东南大学 | Coal-fired boiler combustion power field rapid calculation and real-time display system |
| CN113177374A (en) * | 2021-04-28 | 2021-07-27 | 珠海格力智能装备有限公司 | Combustion characteristic acquisition method and device, electronic equipment and storage medium |
| CN115034138A (en) * | 2022-06-24 | 2022-09-09 | 华北电力大学 | Boiler temperature field prediction method combining computational fluid dynamics and deep learning |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1181477A (en) * | 1996-11-05 | 1998-05-13 | 姜秀民 | Powder coal burner with superfine powder burning device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090125155A1 (en) * | 2007-11-08 | 2009-05-14 | Thomas Hill | Method and System for Optimizing Industrial Furnaces (Boilers) through the Application of Recursive Partitioning (Decision Tree) and Similar Algorithms Applied to Historical Operational and Performance Data |
-
2013
- 2013-03-29 CN CN201310108755.9A patent/CN103235842B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1181477A (en) * | 1996-11-05 | 1998-05-13 | 姜秀民 | Powder coal burner with superfine powder burning device |
Non-Patent Citations (2)
| Title |
|---|
| 200MW四角切圆燃烧锅炉改造工况数据模拟;潘维等;《中国电机工程学报》;20050430;第25卷(第8期);第111页第3段的几何体网格划分 * |
| 变风速下四角切圆锅炉燃烧特性的数值模拟;李德波等;《动力工程学报》;20130315;第33卷(第3期);第173页第2.1-2.3小节 * |
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