CN107346353A - A kind of solid burning article combustion process emulation mode and server - Google Patents
A kind of solid burning article combustion process emulation mode and server Download PDFInfo
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- CN107346353A CN107346353A CN201710415433.7A CN201710415433A CN107346353A CN 107346353 A CN107346353 A CN 107346353A CN 201710415433 A CN201710415433 A CN 201710415433A CN 107346353 A CN107346353 A CN 107346353A
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Abstract
The present invention is a kind of solid burning article combustion process emulation mode and server.Wherein, methods described includes：Incinerator 3-D geometric model is established, and the incinerator 3-D geometric model is handled, the processing includes setting fluid mass and solid burning article porous media region, carries out mesh generation, sets Combustion boundary conditions；According to the incinerator 3-D geometric model after the combustion model of the solid burning article pre-established and processing, the combustion process of the solid burning article is emulated.The server is used to perform the above method.Solid burning article combustion process emulation mode provided by the invention and server, due to incinerator 3-D geometric model can be established, and fluid mass is set, carry out mesh generation, combustion boundary is set, further according to the combustion model of the solid burning article pre-established, the combustion process of solid burning article is emulated, improves the solid burning article accuracy that combustion process emulates in incinerator.
Description
Technical field
The present invention relates to technical field of data processing, and in particular to a kind of solid burning article combustion process emulation mode and clothes
Business device.
Background technology
With the progress of computer technology, computational fluid dynamics gradually heat transfer, mass transfer, momentum transmission, burning,
Multiphase flow and chemical reaction etc. research field are shown up prominently, turn into it is a kind of in equipment research and development, improve existing equipment performance
Important research means.And obtained extensively in boiler, gas turbine, aerospace design, Automobile Design and turbine design etc.
Using.
For combustion gas and the device of burning particles, because the composition of its fuel is single, existing computational fluid dynamics
There are more comprehensive model and theory in (Computational Fluid Dynamics, hereinafter referred to as CFD) software, can be with
Simulation calculation is carried out to its combustion process using existing maturity model.For remains sacrificial offerings incinerator, due to the thing of its burning
Matter is both not belonging to gas, is also not belonging to particle, and generally use porous media model is burned to its in CFD software modeling at present
Cheng Jinhang is emulated.But porous media only has porosity and a kind of parameter setting of material in existing porous media model, and
Porosity and the parameter of material are defaulted as constant in simulations, it is impossible to solid combustion of the accurate simulation in remains sacrificial offerings incinerator
The combustion process of thing.
Therefore, a kind of emulation mode how is proposed, it is possible to increase solid burning article is burned in remains sacrificial offerings incinerator
The genuine accuracys of Cheng Fang turn into industry important topic urgently to be resolved hurrily.
The content of the invention
For in the prior art the defects of, the present invention provides a kind of solid burning article combustion process emulation mode and service
Device.
On the one hand, the present invention proposes a kind of solid burning article combustion process emulation mode, including：
Incinerator 3-D geometric model is established, and the incinerator 3-D geometric model is handled, the processing bag
Include and fluid mass and the solid burning article porous media region are set, mesh generation is carried out to the burner hearth of incinerator, set
Combustion boundary conditions；
According to the combustion model of the solid burning article pre-established, the combustion process of the solid burning article is imitated
Very.
On the other hand, the present invention provides a kind of server, including：
Modeling unit, for establishing incinerator 3-D geometric model, and to the incinerator 3-D geometric model at
Reason, the processing include setting fluid mass and the solid burning article porous media region, and the burner hearth of incinerator is carried out
Mesh generation, Combustion boundary conditions are set；
Simulation unit, for the combustion model according to the solid burning article pre-established, the combustion to the solid burning article
Burning process is emulated.
Solid burning article combustion process emulation mode provided by the invention and server, due to incinerator three-dimensional can be established
Geometrical model, and fluid mass and the solid burning article porous media region are set, mesh generation is carried out, burning side is set
Boundary's condition, further according to the combustion model of the solid burning article pre-established, the combustion process of solid burning article is emulated, carried
The high solid burning article accuracy that combustion process emulates in incinerator.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of one embodiment of the invention solid burning article combustion process emulation mode；
Fig. 2 is the schematic flow sheet of another embodiment of the present invention solid burning article combustion process emulation mode；
Fig. 3 is the schematic flow sheet of further embodiment of this invention solid burning article combustion process emulation mode；
Fig. 4 is the structural representation of one embodiment of the invention server；
Fig. 5 is the structural representation of another embodiment of the present invention server；
Fig. 6 is the structural representation of further embodiment of this invention server.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached in the embodiment of the present invention
Figure, the technical scheme in the embodiment of the present invention is explicitly described, it is clear that described embodiment is a part of the invention
Embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making wound
The every other embodiment obtained under the premise of the property made work, belongs to the scope of protection of the invention.
Solid burning article combustion process emulation mode provided by the invention, is to be proposed based on CFD software, CFD software has
Many kinds, for convenience of description, existed in the examples below with solid burning article combustion process emulation mode provided by the invention
Illustrated exemplified by realization in FLUENT softwares, solid burning article burning provided by the invention is realized in other CFD softwares
Process simulation method is similar with FLUENT softwares.
Fig. 1 is the schematic flow sheet of one embodiment of the invention solid burning article combustion process emulation mode, as shown in figure 1,
Solid burning article combustion process emulation mode provided by the invention, including：
S101, incinerator 3-D geometric model is established, and the incinerator 3-D geometric model is handled, the place
Reason includes setting fluid mass and the solid burning article porous media region, carries out mesh generation, sets combustion boundary bar
Part；
Specifically, in order to be emulated to the combustion process of solid burning article, server is according to being used for the solid combustion
The incinerator entity structure of thing burning, the 3-D geometric model of the incinerator is established, and to the incinerator three-dimensional geometry mould
Type is handled, and the processing includes setting fluid mass and the solid combustion to the 3-D geometric model of the incinerator
Thing porous media region, mesh generation is carried out to the burner hearth of the 3-D geometric model of the incinerator, and combustion boundary is set
Condition；Wherein, the mesh generation can use ICEM softwares in ANSYS to realize.
The incinerator after the combustion model for the solid burning article that S102, basis pre-establish and processing is three-dimensional
Geometrical model, the combustion process of the solid burning article is emulated.
Specifically, the server is being provided with fluid mass to the incinerator 3-D geometric model, is carrying out grid
After dividing and combustion boundary being set, based on the combustion model of the solid burning article, the incinerator three after processing is utilized
Geometrical model is tieed up, the combustion process of the solid burning article is emulated.Wherein, the combustion model pre-establishes.
The combustion process of the solid burning article is emulated, can be realized in FLUENT softwares.
Solid burning article combustion process emulation mode provided by the invention, due to incinerator three-dimensional geometry mould can be established
Type, and fluid mass and the solid burning article porous media region are set, mesh generation is carried out, combustion boundary bar is set
Part, further according to the combustion model of the solid burning article pre-established, the combustion process of solid burning article is emulated, improved
The solid burning article accuracy that combustion process emulates in incinerator.
Fig. 2 is the schematic flow sheet of another embodiment of the present invention solid burning article combustion process emulation mode, such as Fig. 2 institutes
Show, on the basis of above-described embodiment, further, the step of the combustion model for establishing the solid burning article include：
S201, the component for obtaining the solid burning article, the component include moisture, fixed carbon, fugitive constituent；Wherein, institute
The component for stating solid burning article is by carrying out Industrial Analysis acquisition to the solid burning article；
Specifically, the server obtains the component of the solid burning article, and the component of the solid burning article can lead to
Cross and Industrial Analysis acquisition is carried out to the solid burning article, the component includes moisture, fixed carbon and fugitive constituent.
S202, establish the mass-conservation equation of the solid burning article in combustion, the mass-conservation equation bag
Include the quality source item of the solid burning article, quality that the quality source item of the solid burning article separates out for the fugitive constituent, institute
State the quality of fixed carbon burning and the quality sum of the moisture evaporation；
Specifically, mass-conservation equation is also known as continuity equation, and the solid burning article that the server is established is firing
The mass-conservation equation during burning can be expressed as：
Wherein,Density for flow field material changes with time, by convective term, i.e., convection current caused by macroscopic velocity and
The quality source item change of the solid burning article causes,For the convective term, SmFor the quality of the solid burning article
Source item, the quality sum of the quality separated out by the fugitive constituent, the quality of the fixed carbon burning and the moisture evaporation calculate
Draw.
S203, the mass fraction conservation equation of the solid burning article in combustion is established, the mass fraction is kept
Permanent equation includes quality source item, the fixed carbon burning that chemical reaction rate of change, the fugitive constituent of the fugitive constituent separate out
Quality source item and the moisture evaporation quality source item；Wherein, the quality source item of the fugitive constituent precipitation, fixed carbon combustion
The quality source item of burning and the quality source item of the moisture evaporation are respectively according to each self-corresponding quality, reaction rate and burning time
Calculate and obtain；
Specifically, the server establishes the solid burning article burned according to the component of the solid burning article
Mass fraction conservation equation in journey, the mass fraction conservation equation can represent as follows：
Wherein, ρ be flow field material density, i.e. gas density, YiFor the concentration of gas component i in flow field,
For transporting for gas component caused by the convection current due to gas, i.e., gas component spreads caused by convection current,For the gas group
Divide i diffusion flux, mainly caused by concentration gradient and thermograde, RiIt is dense for gas caused by fugitive constituent chemical reaction
The rate of change of degree, i.e., the production rate or consumption rate of described fugitive constituent chemical reaction,It can be expressed as：
Wherein, Di,mFor the diffusion coefficient of gas, SctFor turbulent Schmidt number, μtFor turbulent viscosity, Dt=μt/SctFor rapids
Flow diffusion coefficient, DT,iFor thermograde diffusion coefficient, T is the temperature value in flow field.
Burning of the solid burning article in the incinerator includes Four processes, the evaporation of moisture, fugitive constituent separate out,
The burning of fugitive constituent and the burning of fixed carbon.Wherein, the fugitive constituent is that the solid burning article separates out in combustion
Gas, the composition that the fugitive constituent separates out include CH4, CO and H2.In this application, the combustion mechanism use to fugitive constituent is as follows
Three reactional equations are described：
CH4+1.5O2→CO+2H2O
CO+0.5O2→CO2
H2+O2→H2O
For the rate of change of fugitive constituent chemical reaction, by above-mentioned reactional equation and the fugitive constituent can be searched
Combustion kinetics parameter, which calculates, to be obtained.For example, for reactional equation CH4+1.5O2→CO+2H2O, can search handbook or
Person's document obtains pre-exponential factor A=5.012x1011, activation energy E=2x108, reaction rate index RE=0.7 [CH4], 0.8
[O2], the CH in above-mentioned reactional equation can be calculated4And O2Rate of change 5.012 × 1011[CH4]0.7[O2]0.8exp(-(2×
108)/(RT)), wherein, R is broad sense gas constant, and T is the temperature value on the grid of division.
SiQuality source item, the quality source item of the fixed carbon burning or the moisture evaporation separated out for the fugitive constituent
Quality source item；Wherein, quality that the quality source item that the fugitive constituent separates out can be separated out by the fugitive constituent, the volatilization
The reaction rate and the product of burning time that part separates out, which calculate, to be obtained, and the quality that the fugitive constituent separates out can be obtained by Industrial Analysis
, the reaction rate that the fugitive constituent separates out can be obtained by thermogravimetric analysis, and the burning time is fired to the solid
The combustion process for burning thing carries out emulating setting；The quality source item of the fixed carbon burning can pass through the matter of the fixed carbon
Amount, the reaction rate of the fixed carbon and the product of the burning time, which calculate, to be obtained, and the quality of the fixed carbon can pass through work
Industry analysis is obtained, and the reaction rate of the fixed carbon can be obtained by thermogravimetric analysis；The quality source item of the moisture evaporation can
Obtained with being calculated by the quality of the moisture evaporation, the reaction rate of the moisture evaporation and the product of the burning time, institute
Stating the quality of moisture evaporation can be obtained by Industrial Analysis, and the reaction rate of the moisture evaporation can be obtained by inquiring about handbook
.Wherein, the burning time is set according to actual conditions, and the embodiment of the present invention does not limit.
S203, the energy equation of the solid burning article in combustion is established, the energy equation is divided into porous Jie
The energy equation in matter region and the energy equation of fluid mass, the energy equation in the porous media region include the fugitive constituent
The energy source item of the energy source item of precipitation, the energy source item of the fixed carbon burning and the moisture evaporation；Wherein, the volatilization
The energy source item of energy source item, the energy source item of the fixed carbon burning and moisture evaporation that part separates out is respectively according to each corresponding
The change within the burning time of combustion heat value and corresponding quality calculate and obtain.
Specifically, because the combustion zone of the solid burning article is divided into the porous media area comprising the solid burning article
Domain and the fluid mass for including the fugitive constituent, the energy equation applied for different combustion zones are different.The server
Establishing the energy equation of the solid burning article in combustion includes energy equation and the fluid mass in porous media region
Energy equation.
The energy equation of the fluid mass can be expressed as：
Wherein, ρ be flow field material density, v be flow field speed, p be flow field pressure, keffFor thermal conductivity factor, T is
The temperature value in the flow field,For the diffusion flux of the fugitive constituent j,For viscosity dissipative shock wave, ShFor the fugitive constituent
Energy source item, E are provided by equation belowWherein, v is the speed in flow field, and h is enthalpy, by the fugitive constituent
Each component enthalpy sum, which calculates, to be obtained, i.e. h=∑sjYjhj, wherein hjFor the enthalpy of the fugitive constituent j,
Wherein, Cp,jFor the specific heat at constant pressure of gas, TrefFor reference temperature.Wherein, the density of flow field material is obtained by physical property handbook, institute
The speed for stating flow field calculates acquisition by fluid emulation software, and the pressure in the flow field is obtained by Equation Iterative, the reference
Temperature is obtained by software Flow Field Calculation, and the specific heat at constant pressure of the thermal conductivity factor and the gas is common knowledge, can be passed through
Inquiry obtains.
Due to not only comprising solid but also including fluid media (medium) in porous media, so complex heat transfer coefficient therein is with effectively leading
Hot coefficient describes.The content of the solid burning article is described by porosity.Due to the burning of solid, the porous media area
The porosity in domain constantly becomes big with the time, enhances local gas flowing radiation heat transfer.Except convection current and radiation heat transfer are to temperature
The influence of degree, also need in the energy equation in the porous media region consider that chemical reaction separates out with moisture evaporation, fugitive constituent
To temperature profile effect.To sum up, the energy equation in the porous media region can be expressed as：
Wherein, γ be the solid burning article porosity, ρfFor the density of gas in Solid Void, EfFor the enthalpy of gas
Value, ρsFor the density of the solid burning article, EsFor the enthalpy of the solid burning article, p is fluid field pressure value, and v is flow field speed
Degree, keffFor the effective thermal conductivity in porous media, pass through formula keff=γ kf+(1-γ)ksCalculate and obtain, wherein, wherein
kfFor the thermal conductivity factor of fluid, ksFor the thermal conductivity factor of the solid burning article, hjFor component j enthalpy, JjFor component j expansion
Dissipate flux,For viscosity diffusivity, ShEnergy source item, the energy source item of the fixed carbon burning separated out for the fugitive constituent
With the energy source item of the moisture evaporation；Wherein, the energy source item that the fugitive constituent separates out can be separated out by the fugitive constituent
Combustion heat value calculate and obtain with the fugitive constituent separates out within the burning time mass change, the fixed carbon burning
Energy source item can pass through the mass change meter of the combustion heat value and the fixed carbon within the burning time of the fixed carbon
Calculate and obtain, the energy source item of the moisture evaporation can be by the combustion heat value of the moisture evaporation and within the burning time
The mass change of the moisture evaporation, which calculates, to be obtained；The initial value of the porosity of the solid burning article is obtained by testing, Gu
The density of gas is calculated by the temperature and pressure of region and obtained in body space, and the density of the solid burning article passes through work
Industry analysis obtains, and the enthalpy of the gas, the enthalpy of the solid burning article, the thermal conductivity factor of the fluid are according to temperature and pressure
Power handbook obtains, and the thermal conductivity factor of the solid burning article is constant.
On the basis of the various embodiments described above, further, the reaction rate of the fugitive constituent precipitation, fixed carbon combustion
The reaction rate of the reaction rate of burning and the moisture evaporation is calculated according to the Arrhenius Equation and obtained.
Specifically, in the combustion process of solid burning article, the reaction rate of the fugitive constituent precipitation, fixed carbon combustion
The reaction of burning and the reaction rate of the moisture evaporation are controlled by the Arrhenius Equation, can be calculated and obtained by equation below
：
Wherein, reaction rate, the reaction of the fixed carbon burning or the moisture evaporation that fugitive constituent described in K separates out
Reaction rate, A are pre-exponential factor, and E is activation energy, and R is broad sense gas constant, and T is solid burning article combustion process simulation process
Temperature value on the grid of middle division.A, E and R value can be obtained by handbook, document and thermogravimetric test.
Fig. 3 is the schematic flow sheet of further embodiment of this invention solid burning article combustion process emulation mode, such as Fig. 3 institutes
Show, on the basis of the various embodiments described above, further, the combustion model for the solid burning article that the basis pre-establishes and
The incinerator 3-D geometric model after processing, carrying out emulation to the combustion process of the solid burning article includes：
S1021, the original state for setting the solid burning article, the original state include the matter of the solid burning article
Measure, the mass fraction of each component, the combustion heat value of each component, the hole of the solid burning article in the solid burning article
Rate and temperature；
Specifically, before being emulated to the combustion process of the solid burning article, the server is needed described in setting
The original state of solid burning article, the original state include the quality of the solid burning article, each in the solid burning article
The mass fraction of component, the combustion heat value of each component, the porosity and temperature of the solid burning article.Wherein, it is described solid
In the quality of body comburant, the solid burning article in the mass fraction of each component, the solid burning article each component burning
Calorific value can be by carrying out Industrial Analysis acquisition to the solid burning article, and the porosity of the solid burning article can pass through reality
Test amount obtains, and the temperature can be set as normal temperature.
S1022, according to the quality of the solid burning article, the mass fraction of each component, the porosity, the temperature
Degree and the combustion model, calculate the remaining matter for obtaining each component described in the solid burning article after default burning time
Amount, and update the mass fraction of each component and the porosity；
Specifically, the simulation of the combustion process is realized in FLUENT softwares, and the server is in FLUENT softwares
Open the combustion model, including the mass-conservation equation, the mass fraction conservation equation, the energy equation, turbulent flow
Equation and radiation patterns, the Equations of Turbulence and the radiation patterns use default setting in FLUENT softwares.The service
The quality of the solid burning article, the mass fraction of each component, the porosity and the temperature are input to described by device
In combustion model, the residual mass for obtaining each component described in the solid burning article after default burning time can be calculated,
The default burning time is configured according to actual conditions, and the embodiment of the present invention does not limit.The server is according to
The residual mass of each component, update the mass fraction of each component and the porosity, the specific calculating of the porosity
Process is prior art, and here is omitted.
S1023, according to the combustion heat value of each component and the corresponding each component quality in the preset time
Change, update the energy source item of each component；
Specifically, the solid burning article during burning along with the change of energy, it is described solid in original state
Body comburant is not burnt, and the energy source item of each component is zero, and the solid burning article is released in combustion
Heat, correspondingly, the energy source item of each component change.The server can obtain the institute in the preset time
The change of each component quality is stated, according to the change of the combustion heat value of each component and the corresponding each component quality, to institute
The energy source item for stating each component is updated.
If S1024, judgement know that rate of change of the mass fraction of each component within the default burning time is less than
Preset value, then terminate the simulation process；Otherwise, the simulation process is continued.
Specifically, in Actual combustion, by the regular hour, the solid burning article can burn totally.Correspondingly, exist
In the simulation process of the combustion process, the server can calculate the mass fraction of each component in the default burning
Rate of change in time, by the rate of change compared with preset value, if the rate of change is less than preset value, judge institute
State solid burning article burning totally, the server terminates the simulation process；If the rate of change is more than or equal to described pre-
If value, the server continues the simulation process, i.e., after next default burning time, the server update institute
The energy source item of the mass fraction of each component, the porosity and each component is stated, then calculates each component again
Rate of change of the mass fraction within next default burning time, judge that termination is also to continue with the simulation process.
On the basis of the various embodiments described above, further, methods described also includes：
The combustion parameter for the solid burning article combustion process emulate acquisition is exported, to enter to the incinerator
Row improves；Wherein, the combustion parameter is the parameter related to the combustion process.
Specifically, the server can be imitated the solid burning article combustion process under different working conditions
Very, the combustion parameter under different working conditions is exported, the combustion parameter is the parameter related to the combustion process, including combustion
Burn time, speed field distribution, distribution of pollutant etc..The combustion parameter, can be that the improvement of the structure of the incinerator carries
For reference.
It for example, by the analysis to the speed field distribution, can learn in the design of incinerator, can suitably increase
The space of rotary area, mixed gas is become big in this part of residence time, extend the reaction time, be advantageous to the complete of gas
Full burning.
Fig. 4 is the structural representation of one embodiment of the invention server, as shown in figure 4, a kind of service provided by the invention
Device includes modeling unit 401 and simulation unit 402, wherein：
Modeling unit 401 is used to establish incinerator 3-D geometric model, and the incinerator 3-D geometric model is carried out
Processing, the processing include setting fluid mass and the solid burning article porous media region, carry out mesh generation, set
Combustion boundary conditions；Simulation unit 402 is used for according to after the combustion model of the solid burning article pre-established and processing
The incinerator 3-D geometric model, the combustion process of the solid burning article is emulated.
Specifically, in order to be emulated to the combustion process of solid burning article, modeling unit 401 is according to for the solid
The incinerator entity structure of comburant burning, the 3-D geometric model of the incinerator is established, and it is several to the incinerator three-dimensional
What model is handled, and the processing includes setting fluid mass and the solid to the 3-D geometric model of the incinerator
Comburant porous media region, mesh generation is carried out to the burner hearth of the 3-D geometric model of the incinerator, and burning is set
Boundary condition；Wherein, the mesh generation can use ICEM softwares in ANSYS to realize.
Is being provided with by fluid mass, carried out mesh generation and is setting combustion boundary for the incinerator 3-D geometric model
Afterwards, combustion model of the simulation unit 402 based on the solid burning article, the incinerator three-dimensional geometry mould after processing is utilized
Type, the combustion process of the solid burning article is emulated.Wherein, the combustion model pre-establishes.To described solid
The combustion process of body comburant is emulated, and can be realized in FLUENT softwares.
Server provided by the invention, due to incinerator 3-D geometric model can be established, and set fluid mass and
The solid burning article porous media region, mesh generation is carried out, Combustion boundary conditions are set, further according to the solid pre-established
The combustion model of comburant, the combustion process of solid burning article is emulated, improve solid burning article and fired in incinerator
Burn the accuracy of process simulation.
Fig. 5 is the structural representation of another embodiment of the present invention server, as shown in figure 5, in the base of the various embodiments described above
On plinth, further, the server also includes obtaining unit 403, first establishes unit 404, second establishes unit 405 and the
Three establish unit 406, wherein：
Obtaining unit 403 is used for the component for obtaining the solid burning article, and the component includes moisture, fixed carbon, volatilization
Part；Wherein, the component of the solid burning article is by carrying out Industrial Analysis acquisition to the solid burning article；First establishes
Unit 404 is used to establish the mass-conservation equation of the solid burning article in combustion, and the mass-conservation equation includes
The quality source item of the solid burning article, it is quality that the quality source item of the solid burning article separates out for the fugitive constituent, described
The quality of fixed carbon burning and the quality sum of the moisture evaporation；Second, which establishes unit 405, is used to establish the solid combustion
The mass fraction conservation equation of thing in combustion, the mass fraction conservation equation include the chemical reaction of the fugitive constituent
Quality source item, the quality source item of the fixed carbon burning and the quality of the moisture evaporation that rate of change, the fugitive constituent separate out
Source item；Wherein, quality source item, the quality source item of the fixed carbon burning and the matter of the moisture evaporation that the fugitive constituent separates out
Measure source item and acquisition is calculated according to each self-corresponding quality, reaction rate and burning time respectively；3rd, which establishes unit 406, is used to build
The energy equation of the solid burning article in combustion is found, the energy equation is divided into the energy equation in porous media region
With the energy equation of fluid mass, the energy equation in the porous media region include the energy source item that the fugitive constituent separates out,
The energy source item of the fixed carbon burning and the energy source item of the moisture evaporation；Wherein, the energy source that the fugitive constituent separates out
, the energy source item of the energy source item of the fixed carbon burning and moisture evaporation is respectively according to each self-corresponding combustion heat value and right
Change of the quality answered within the burning time, which calculates, to be obtained.
Specifically, obtaining unit 403 obtains the component of the solid burning article, and the component of the solid burning article can lead to
Cross and Industrial Analysis acquisition is carried out to the solid burning article, the component includes moisture, fixed carbon and fugitive constituent.
Mass-conservation equation is also known as continuity equation, and the first solid burning article for establishing the foundation of unit 404 is burning
During the mass-conservation equation can be expressed as：
Wherein,Density for flow field material changes with time, by convective term, i.e., convection current caused by macroscopic velocity and
The quality source item change of the solid burning article causes,For the convective term, SmFor the quality of the solid burning article
Source item, the quality sum of the quality separated out by the fugitive constituent, the quality of the fixed carbon burning and the moisture evaporation calculate
Draw.
Second establishes component of the unit 405 according to the solid burning article, establishes the solid burning article in combustion process
In mass fraction conservation equation, the mass fraction conservation equation can represent as follows：
Wherein, ρ be flow field material density, YiFor the concentration of gas component i in flow field,For due to gas
Gas component caused by convection current spreads,For the diffusion flux of the component i, mainly caused by concentration gradient and thermograde,
RiFor the rate of change of gas concentration caused by fugitive constituent chemical reaction, i.e., the production rate of fugitive constituent chemical reaction or disappear
Consumption rate,It can be expressed as：
Wherein, Di,mFor the diffusion coefficient of gas, SctFor turbulent Schmidt number, μtFor turbulent viscosity, Dt=μt/SctFor rapids
Flow diffusion coefficient, DT,iFor diffusion coefficient caused by thermograde, T is the temperature value in the flow field, unit K, Kelvin, absolutely
To temperature.
Burning of the solid burning article in the incinerator includes Four processes, the evaporation of moisture, fugitive constituent separate out,
The burning of fugitive constituent and the burning of fixed carbon.Wherein, the fugitive constituent is that the solid burning article separates out in combustion
Gas, the composition that the fugitive constituent separates out include CH4, CO and H2.In this application, the combustion mechanism use to fugitive constituent is as follows
Three reactional equations are described：
CH4+1.5O2→CO+2H2O
CO+0.5O2→CO2
H2+O2→H2O
For the rate of change of fugitive constituent chemical reaction, by above-mentioned reactional equation and the fugitive constituent can be searched
Combustion kinetics parameter, which calculates, to be obtained.For example, for reactional equation CH4+1.5O2→CO+2H2O, can search handbook or
Person's document obtains pre-exponential factor A=5.012x1011, activation energy E=2x108, reaction rate index RE=0.7 [CH4], 0.8
[O2], the CH in above-mentioned reactional equation can be calculated4And O2Rate of change 5.012 × 1011[CH4]0.7[O2]0.8exp(-(2×
108)/(RT)), wherein, R is broad sense gas constant, and T is the temperature value on the grid of division.
SiQuality source item, the quality source item of the fixed carbon burning or the moisture evaporation separated out for the fugitive constituent
Quality source item；Wherein, quality that the quality source item that the fugitive constituent separates out can be separated out by the fugitive constituent, the volatilization
The reaction rate and the product of burning time that part separates out, which calculate, to be obtained, and the quality that the fugitive constituent separates out can be obtained by Industrial Analysis
, the reaction rate that the fugitive constituent separates out can be obtained by thermogravimetric analysis, and the burning time is fired to the solid
The combustion process for burning thing carries out emulating setting；The quality source item of the fixed carbon burning can pass through the matter of the fixed carbon
Amount, the reaction rate of the fixed carbon and the product of the burning time, which calculate, to be obtained, and the quality of the fixed carbon can pass through work
Industry analysis is obtained, and the reaction rate of the fixed carbon can be obtained by thermogravimetric analysis；The quality source item of the moisture evaporation can
Obtained with being calculated by the quality of the moisture evaporation, the reaction rate of the moisture evaporation and the product of the burning time, institute
Stating the quality of moisture evaporation can be obtained by Industrial Analysis, and the reaction rate of the moisture evaporation can be obtained by inquiring about handbook
, the burning time is to carry out emulating setting in the combustion process to the solid burning article.Wherein, the burning time
Set according to actual conditions, the embodiment of the present invention does not limit.
Because the combustion zone of the solid burning article is divided into comprising the porous media region of the solid burning article and bag
Fluid mass containing the fugitive constituent, the energy equation applied for different combustion zones are different.3rd, which establishes unit 406, builds
Found energy equation and fluid mass of the energy equation of the solid burning article in combustion including porous media region
Energy equation.
The energy equation of the fluid mass can be expressed as：
Wherein, ρ is the density of flow field material, and v is flow field velocity, and p is the pressure in flow field, keffFor thermal conductivity factor, T is
The temperature value in the flow field,For the diffusion flux of the fugitive constituent j,For viscosity dissipative shock wave, ShFor the fugitive constituent
Energy source item, E are provided by equation belowWherein, v is the speed of fluid, and h is enthalpy, by the fugitive constituent
Each component enthalpy sum, which calculates, to be obtained, i.e. h=∑sjYjhj, wherein hjFor the enthalpy of the fugitive constituent j,
Wherein, Cp,jFor the specific heat at constant pressure of gas, TrefBe 0 DEG C for reference temperature, i.e. 273.15K.
Due to not only comprising solid but also including fluid media (medium) in porous media, so complex heat transfer coefficient therein is with effectively leading
Hot coefficient describes.The content of the solid burning article is described by porosity.Due to the burning of solid, the porous media area
The porosity in domain constantly becomes big with the time, enhances local gas flowing radiation heat transfer.Except convection current and radiation heat transfer are to temperature
The influence of degree, also need in the energy equation in the porous media region consider that chemical reaction separates out with moisture evaporation, fugitive constituent
To temperature profile effect.To sum up, the energy equation in the porous media region can be expressed as：
Wherein, γ be the solid burning article porosity, ρfFor the density of gas in Solid Void, EfFor the enthalpy of gas
Value, ρsFor the density of the solid burning article, EsFor the enthalpy of the solid burning article, p is fluid field pressure value, v is flow field speed
Degree, keffFor the effective thermal conductivity in porous media, pass through formula keff=γ kf+(1-γ)ksCalculate and obtain, wherein, wherein
kfFor the thermal conductivity factor of fluid, ksFor the thermal conductivity factor of solid, hjFor component j enthalpy, JjFor component j diffusion flux,
For viscosity diffusivity, ShEnergy source item, the energy source item of the fixed carbon burning and the moisture separated out for the fugitive constituent
The energy source item of evaporation；Wherein, the combustion heat value that the energy source item that the fugitive constituent separates out can be separated out by the fugitive constituent
With the mass change calculating acquisition that the fugitive constituent separates out within the burning time, the energy source item of the fixed carbon burning can
Calculated and obtained with the mass change by the combustion heat value of the fixed carbon and the fixed carbon within the burning time, it is described
The energy source item of moisture evaporation can the combustion heat value by the moisture evaporation and the moisture steaming within the burning time
The mass change of hair, which calculates, to be obtained.
On the basis of the various embodiments described above, further, the reaction rate of the fugitive constituent precipitation, fixed carbon combustion
The reaction rate of the reaction rate of burning and the moisture evaporation is calculated according to the Arrhenius Equation and obtained.
Specifically, in the combustion process of solid burning article, the reaction rate of the fugitive constituent precipitation, fixed carbon combustion
The reaction of burning and the reaction rate of the moisture evaporation are controlled by the Arrhenius Equation, can be calculated and obtained by equation below
：
Wherein, reaction rate, the reaction of the fixed carbon burning or the moisture evaporation that fugitive constituent described in K separates out
Reaction rate, A are pre-exponential factor, and E is activation energy, and R is broad sense gas constant, and T is solid burning article combustion process simulation process
Temperature value on the grid of middle division.A, E and R value can be obtained by handbook, document and thermogravimetric test.
Fig. 6 is the structural representation of further embodiment of this invention server, as shown in fig. 6, in the base of the various embodiments described above
On plinth, further, simulation unit 402, which specifically includes, sets subelement 4021, the first updating block 4022, the second updating block
4023 and judgment sub-unit 4024, wherein：
Subelement 4021 is set to be used for the original state that the solid burning article is set, the original state includes described solid
The quality of body comburant, the mass fraction of each component, the combustion heat value of each component, the solid in the solid burning article
The porosity and temperature of comburant；First updating block 4022 is for the quality according to the solid burning article, each component
Mass fraction, the porosity, the temperature and the combustion model, calculate obtain it is described solid after default burning time
The residual mass of each component described in body comburant, and update the mass fraction of each component and the porosity；Second
Updating block 4023 is used for combustion heat value and the corresponding each component quality in the preset time according to each component
Change, update the energy source item of each component；If judgment sub-unit 4024 is used to judge the quality for knowing each component
Rate of change of the number within the default burning time is less than preset value, then the simulation process terminates；Otherwise, continue described imitative
True process.
Specifically, before being emulated to the combustion process of the solid burning article, subelement 4021 is set to need to set
The original state of the solid burning article, the original state include the quality of the solid burning article, the solid burning article
The combustion heat value of each component in the mass fraction of middle each component, the solid burning article, the porosity of the solid burning article and
Temperature.Wherein, the mass fraction of each component in the quality of the solid burning article, the solid burning article, each component
Combustion heat value can be by carrying out Industrial Analysis acquisition to the solid burning article, and the porosity of the solid burning article can lead to
Cross experiment measurement to obtain, the temperature can be set as normal temperature.
The simulation of the combustion process realizes that the first updating block 4022 is opened in FLUENT softwares in FLUENT softwares
Open the combustion model, including the mass-conservation equation, the mass fraction conservation equation, the energy equation, turbulent flow side
Journey and radiation patterns, the Equations of Turbulence and the radiation patterns use default setting in FLUENT softwares.First renewal is single
The quality of the solid burning article, the mass fraction of each component, the porosity and the temperature are input to by member 4022
In the combustion model, the remaining matter for obtaining each component described in the solid burning article after default burning time can be calculated
Amount, the default burning time are configured according to actual conditions, and the embodiment of the present invention does not limit.First updating block 4022
According to the residual mass of each component, the mass fraction of each component and the porosity are updated, the porosity
Specific calculating process is prior art, and here is omitted.
The solid burning article during burning along with the change of energy, in original state, the solid combustion
Thing is not burnt, and the energy source item of each component is zero, and the solid burning article releases heat, phase in combustion
Ying Di, the energy source item of each component change.Second updating block 4023 can obtain the institute in the preset time
The change of each component quality is stated, according to the change of the combustion heat value of each component and the corresponding each component quality, to institute
The energy source item for stating each component is updated.
In Actual combustion, by the regular hour, the solid burning article can burn totally.Correspondingly, in the combustion
In the simulation process of burning process, judgment sub-unit 4024 can calculate the mass fraction of each component in the default burning
In rate of change, by the rate of change with preset value compared with, if the rate of change is less than preset value, described in judgement
Solid burning article burns totally, and judgment sub-unit 4024 terminates the simulation process；If the rate of change is more than or equal to described
Preset value, the server continue the simulation process, i.e., after next default burning time, the first updating block
The mass fraction and the porosity, the second updating block 4023 of the 4022 renewal each components update the energy of each component
Source item, judgment sub-unit 4024 calculate the mass fraction of each component within next default burning time again
Rate of change, judge that termination is also to continue with the simulation process.
On the basis of the various embodiments described above, further, the server also includes output unit, wherein：
The output unit is used to export the combustion parameter for the solid burning article combustion process emulate acquisition, with
Just the incinerator is improved；Wherein, the combustion parameter is the parameter related to the combustion process.The burning ginseng
Number, can provide reference for the improvement of the structure of the incinerator.
Specifically, the server can be imitated the solid burning article combustion process under different working conditions
Very, the output unit exports the combustion parameter under different working conditions, and the combustion parameter is related to the combustion process
Parameter, including burning time, speed field distribution, distribution of pollutant etc..
The embodiment of server provided by the invention specifically can be used for the handling process for performing above-mentioned each method embodiment,
Its function will not be repeated here, and be referred to the detailed description of above method embodiment.
Server example described above is only schematical, wherein the unit illustrated as separating component
It can be or may not be physically separate, can be as the part that unit is shown or may not be physics list
Member, you can with positioned at a place, or can also be distributed on multiple NEs.It can be selected according to the actual needs
In some or all of module realize the purpose of this embodiment scheme.Those of ordinary skill in the art are not paying creativeness
Work in the case of, you can to understand and implement.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
Realized by the mode of software plus required general hardware platform, naturally it is also possible to pass through hardware.Based on such understanding, on
The part that technical scheme substantially in other words contributes to prior art is stated to embody in the form of software product, should
Computer software product can store in a computer-readable storage medium, such as ROM/RAM, magnetic disc, CD, including some fingers
Make to cause a computer equipment (can be personal computer, server, or network equipment etc.) to perform each implementation
Method described in some parts of example or embodiment.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
- A kind of 1. solid burning article combustion process emulation mode, it is characterised in that including：Incinerator 3-D geometric model is established, and the incinerator 3-D geometric model is handled, the processing includes setting Fluid mass and the solid burning article porous media region are put, carries out mesh generation, Combustion boundary conditions are set；According to the incinerator 3-D geometric model after the combustion model of the solid burning article pre-established and processing, The combustion process of the solid burning article is emulated.
- 2. according to the method for claim 1, it is characterised in that wrap the step of the combustion model for establishing the solid burning article Include：The component of the solid burning article is obtained, the component includes moisture, fixed carbon, fugitive constituent；Wherein, the solid combustion The component of thing is by carrying out Industrial Analysis acquisition to the solid burning article；The mass-conservation equation of the solid burning article in combustion is established, the mass-conservation equation includes the solid The quality source item of comburant, the quality source item of the solid burning article is the quality of fugitive constituent precipitation, fixed carbon combustion The quality sum of the quality of burning and the moisture evaporation；The mass fraction conservation equation of the solid burning article in combustion is established, the mass fraction conservation equation includes Quality source item, the quality source item of the fixed carbon burning that chemical reaction rate of change, the fugitive constituent of the fugitive constituent separate out With the quality source item of the moisture evaporation；Wherein, the quality source item of the fugitive constituent precipitation, the Mass Sources of the fixed carbon burning The quality source item of item and the moisture evaporation calculates according to each self-corresponding quality, reaction rate and burning time obtain respectively；The energy equation of the solid burning article in combustion is established, the energy equation is divided into the energy in porous media region Equation and the energy equation of fluid mass are measured, the energy equation in the porous media region includes the energy that the fugitive constituent separates out The energy source item of source item, the energy source item of the fixed carbon burning and the moisture evaporation；Wherein, the energy that the fugitive constituent separates out The energy source item of source item, the energy source item of the fixed carbon burning and the moisture evaporation is measured respectively according to each self-corresponding burning The change of calorific value and corresponding quality within the burning time, which calculates, to be obtained.
- 3. according to the method for claim 2, it is characterised in that the reaction rate of the fugitive constituent precipitation, the fixed carbon The reaction rate of the reaction rate of burning and the moisture evaporation is calculated according to the Arrhenius Equation and obtained.
- 4. according to the method for claim 2, it is characterised in that the combustion for the solid burning article that the basis pre-establishes The incinerator 3-D geometric model after model and processing is burnt, simulation package is carried out to the combustion process of the solid burning article Include：The original state of the solid burning article is set, and the original state includes the quality of the solid burning article, described solid The mass fraction of each component, the combustion heat value of each component, the porosity and temperature of the solid burning article in body comburant；According to the quality of the solid burning article, the mass fraction of each component, the porosity, the temperature and described Combustion model, the residual mass for obtaining each component described in the solid burning article after default burning time is calculated, and updated The mass fraction of each component and the porosity；According to the change of the combustion heat value of each component and the corresponding each component quality in the preset time, institute is updated State the energy source item of each component；If judge to know that rate of change of the mass fraction of each component within the default burning time is less than preset value, eventually The only simulation process；Otherwise, the simulation process is continued.
- 5. according to the method described in any one of Claims 1-4, it is characterised in that also include：The combustion parameter for the solid burning article combustion process emulate acquisition is exported, to change to the incinerator Enter；Wherein, the combustion parameter is the parameter related to the combustion process.
- A kind of 6. server, it is characterised in that including：Modeling unit, handled for establishing incinerator 3-D geometric model, and to the incinerator 3-D geometric model, institute Stating processing includes setting fluid mass and the solid burning article porous media region, carries out mesh generation, sets burning side Boundary's condition；Simulation unit, for the incinerator after the combustion model according to the solid burning article pre-established and processing 3-D geometric model, the combustion process of the solid burning article is emulated.
- 7. server according to claim 6, it is characterised in that also include：Obtaining unit, for obtaining the component of the solid burning article, the component includes moisture, fixed carbon, fugitive constituent；Its In, the component of the solid burning article is by carrying out Industrial Analysis acquisition to the solid burning article；First establishes unit, and for establishing the mass-conservation equation of the solid burning article in combustion, the quality is kept Permanent equation includes the quality source item of the solid burning article, and the quality source item of the solid burning article is fugitive constituent precipitation The quality sum of quality, the quality of the fixed carbon burning and the moisture evaporation；Second establishes unit, for establishing the mass fraction conservation equation of the solid burning article in combustion, the matter Measuring fraction conservation equation includes the quality source item, described solid that chemical reaction rate of change, the fugitive constituent of the fugitive constituent separate out Determine the quality source item of carbon burning and the quality source item of the moisture evaporation；Wherein, it is the fugitive constituent separates out quality source item, described The quality source item of fixed carbon burning and the quality source item of the moisture evaporation respectively according to each self-corresponding quality, reaction rate and Burning time, which calculates, to be obtained；3rd establishes unit, for establishing the energy equation of the solid burning article in combustion, the energy equation point The energy equation of energy equation and fluid mass for porous media region, the energy equation in the porous media region include institute State energy source item, the energy source item of the fixed carbon burning and the energy source item of the moisture evaporation of fugitive constituent precipitation；Wherein, The energy source item difference for energy source item, the energy source item of the fixed carbon burning and the moisture evaporation that the fugitive constituent separates out Calculated and obtained according to the change of each self-corresponding combustion heat value and corresponding quality within the burning time.
- 8. server according to claim 7, it is characterised in that the reaction rate of the fugitive constituent precipitation, the fixation The reaction rate of the reaction rate of carbon burning and the moisture evaporation is calculated according to the Arrhenius Equation and obtained.
- 9. server according to claim 7, it is characterised in that the simulation unit specifically includes：Subelement is set, and for setting the original state of the solid burning article, the original state includes the solid combustion The quality of thing, the mass fraction of each component, the combustion heat value of each component, the solid burning article in the solid burning article Porosity and temperature；First updating block, for the quality according to the solid burning article, the mass fraction of each component, the hole Rate, the temperature and the combustion model, calculate and obtain each group described in the solid burning article after default burning time The residual mass divided, and update the mass fraction of each component；Second updating block, for the combustion heat value according to each component and the corresponding each component in the preset time The change of quality, update the energy source item and the porosity；Judgment sub-unit, for knowing rate of change of the mass fraction of each component within the default burning time in judgement After preset value, the simulation process is terminated；Otherwise, the simulation process is continued.
- 10. according to the server described in any one of claim 6 to 9, it is characterised in that also including output unit, wherein：The output unit, the combustion parameter of emulation acquisition is carried out to the solid burning article combustion process for exporting, so as to The incinerator is improved；Wherein, the combustion parameter is the parameter related to the combustion process.
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| CN116306046A (en) * | 2023-05-23 | 2023-06-23 | 北京云道智造科技有限公司 | Method and device for determining component concentration in combustion simulation |
| CN116306046B (en) * | 2023-05-23 | 2023-10-03 | 北京云道智造科技有限公司 | Method and device for determining component concentration in combustion simulation |
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