CN105868445A - Method for simulating instantaneous temperature of microwave pyrolysis biomass and biochar mixing sample - Google Patents
Method for simulating instantaneous temperature of microwave pyrolysis biomass and biochar mixing sample Download PDFInfo
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Abstract
The invention provides a method for simulating an instantaneous temperature of a microwave pyrolysis biomass and biochar mixing sample. The method comprises the following steps of: (1) respectively obtaining a dielectric property-temperature curve profile of biomasses and biochar corresponding to the biomasses; (2) obtaining a dielectric property-temperature curve profile of a biomass and biochar mixing sample in a pyrolysis process; (3) establishing a microwave pyrolysis system geometric model; (4) establishing an electromagnetic field and electromagnetic loss model of the microwave pyrolysis system geometric model; (5) establishing a heat distribution model of a mixing sample model in the pyrolysis process; and (6) meshing the electromagnetic field and electromagnetic loss model and the heat distribution model, obtaining a 3D (three-dimensional) distribution diagram of an electromagnetic field and an electromagnetic loss of the microwave pyrolysis system geometric model and a 3D distribution diagram of the temperature of the mixing sample model under microwave radiation by using a distributed algorithm. The method provided by the invention is simple and easy to operate, and capable of highly simulating the 3D distribution diagram of the temperature of the biomass and biochar mixing sample model under microwave radiation.
Description
Technical field
The invention belongs to microwave-heating technical field, relate to a kind of microwave-heating biomass and charcoal biased sample transient temperature
Analogy method.
Background technology
Microwave heating belongs to internal mode of heating, is the process of a kind of energy conversion.At least a kind of group in this technological requirement material
Divide and i.e. as microwave-absorbing body, to absorb microwave efficiently, electromagnetic energy can be converted to heat energy with microwave generation close coupling.
Compared with traditional heating mode, it is capable of quickly heating heats with selectivity.But this is because of this feature, and because
Can be dispelled the heat inside material the limited and outside thermal loss caused with surrounding objects temperature difference so that internal temperature, higher than outside, goes out
Existing thermograde.I.e. can reach temperature required inside material the soonest within several seconds.But it is because different materials Jie to microwave
Electrical loss and loss tangent are all different, and the charcoal produced such as Caulis et Folium Oryzae pyrolysis is good microwave absorption, it is possible to be chosen
Property heating, and the surface of biological carbon can generate stable microwave plasma body region under microwave exposure, forms hot localised points；
And pure biomass absorb, convert the poor ability of microwave.So microwave heating can reach the effect of selectivity heating to biased sample
Really so that the bigger temperature difference occur in container and heating material inside, temperature runaway and local hot spot phenomenon then occur.Therefore, utilize
The 3D temperature sidelights on that analogy method obtains microwave-heating biomass are most important to analysis and regulation and control microwave-heating biomass technique.
Arshad Adam Salema et al. utilizes COMSOL software founding mathematical models to have studied sky shell compression forming material
Heat distribution at microwave heating process, it is thus achieved that the heat distribution under the conditions of microwave radiation of the pure shell material and focus.Zhu Hua assistant officer etc.
People, in the case of researching microwave drying Rhizoma Solani tuber osi, utilizes COMSOL to set up modeling Rhizoma Solani tuber osi and utilizes microwave radiation dehydrated
Heat distribution in journey.Hussain et al. utilizes Fluid Mechanics Computation (ANSYSTM CFX 13.0) empty to microwave-heating palm shell
The Temperature Distribution of fruit string fiber (EFB) has carried out the experiment parameter of three-dimensional simulation research and has included thermal source direction, N2Flow, microwave
Energy density etc..Di Blasi utilizes MATLAB that Masson Pine conventional pyrolytic and microwave-heating founding mathematical models are studied pyrolysis row
For.
The analogy method of microwave current auxiliary heating technique uses the softwares such as MATLAB, CST and COMSOL, foundation
Model mainly has 2D and 3D, and the object of simulation is mainly the material that lignocellulose-like biomass and food etc. are single, the most mixed
Close material.
Summary of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of microwave-heating biomass and mixes with charcoal
Close the analogy method of sample transient temperature, be used for solving of the prior art only for single material analogy method, and the most right
The problem of biased sample analogy method.
For achieving the above object and other relevant purposes, the present invention provides a kind of microwave-heating biomass and charcoal biased sample wink
The analogy method of state temperature, described analogy method comprises the following steps:
1) biomass and the dielectric property-temperature curve sidelights on of the charcoal corresponding with described biomass are obtained respectively；
2) described biomass and described charcoal are mixed to get biased sample, according to biomass described in described biased sample and institute
Dielectric property-the temperature stating the mass ratio of charcoal, the dielectric property-temperature curve sidelights on of described biomass and described charcoal is bent
Line side is write and is obtained described biased sample dielectric property in pyrolytic process-temperature curve sidelights on；
3) setting up the geometric model of microwave-heating system, the geometric model of described microwave-heating system includes microwave generating apparatus mould
Type, reactor model and the model of described biased sample, described reactor model is positioned at described microwave generating apparatus model, institute
State biased sample model and be positioned at described reactor model；
4) according to the dielectric property-temperature curve sidelights on of described microwave-heating system geometric model and described biased sample, institute is set up
State electromagnetic field and the electromagnetic consumable model of microwave-heating system geometric model；
5) it is heat energy by the electromagnetic energy in described electromagnetic field and electromagnetic consumable model, sets up described aggregate sample according to described heat energy
Product model heat distribution model in pyrolytic process；
6) utilize the tetrahedral grid technique of painting that described electromagnetic field and electromagnetic consumable model and described heat distribution model are carried out stress and strain model,
Utilize distributed algorithm in the electromagnetic field in described electromagnetic field and electromagnetic consumable model and electromagnetic consumable and described heat distribution model
Thermal field carries out computing, obtains the described electromagnetic field of microwave-heating system geometric model and the 3D scattergram of electromagnetic consumable and described mixed
Close the 3D distribution of instance model temperature under microwave radiation.
As the scheme of microwave-heating biomass of the present invention Yu a kind of optimization of the analogy method of charcoal biased sample transient temperature,
Described step 1) in, obtain biomass and the dielectric property-temperature curve sidelights on of the charcoal corresponding with described biomass respectively
Comprise the following steps:
11) provide biomass, be dried after described biomass are pulverized；
12) dried described biomass are placed in N2Atmosphere is pyrolyzed, utilizes Hewlett Packard 8753C vector network to divide
Analyzer obtains the dielectric property-temperature curve sidelights on of described biomass under 2.45GHz frequency；
13) described charcoal is placed in N2Atmosphere is pyrolyzed, utilizes Hewlett Packard 8753C vector network analyzer to exist
Dielectric property-temperature curve the sidelights on of described charcoal are obtained under 2.45GHz frequency.
As a kind of preferred version of analogy method of microwave-heating biomass and the charcoal biased sample transient temperature of the present invention,
Described step 1) in, described biomass include rice straw, wood fragments bits or brown coal；Described charcoal is Caulis et Folium Oryzae carbon or activated carbon.
As the scheme of microwave-heating biomass of the present invention Yu a kind of optimization of the analogy method of charcoal biased sample transient temperature,
Described step 2) in, according to biomass described in described biased sample and the mass ratio of described charcoal, Jie of described biomass
The dielectric property of electrical property-temperature curve sidelights on and described charcoal-temperature curve sidelights on, use LLLE formula to calculate acquisition described
Biased sample dielectric property-temperature curve sidelights in pyrolytic process, described LLLE formula is:
Wherein, ε is the dielectric property of biased sample, including dielectric constant, dielectric loss factor；viFor biological in biased sample
Matter or the mass fraction of charcoal；εiFor biomass in biased sample or the dielectric property of charcoal, including dielectric constant, dielectric
Fissipation factor.
As the scheme of microwave-heating biomass of the present invention Yu a kind of optimization of the analogy method of charcoal biased sample transient temperature,
Described step 3) in, utilize the GEO module in COMSOL Multiphysics 5.0 multiple physical field finite element software according to 1:
The ratio of 1 sets up the geometric model of described microwave-heating system.
As the scheme of microwave-heating biomass of the present invention Yu a kind of optimization of the analogy method of charcoal biased sample transient temperature,
Described step 4) in, utilize the RF module in COMSOL Multiphysics 5.0 multiple physical field finite element software according to Maxwell
The electromagnetic field of microwave-heating system geometric model described in establishing equation and electromagnetic consumable model.
As the scheme of microwave-heating biomass of the present invention Yu a kind of optimization of the analogy method of charcoal biased sample transient temperature,
Described step 5) in, utilize the heat transfer module in COMSOL Multiphysics 5.0 multiple physical field finite element software by described electricity
Electromagnetic energy in magnetic field and electromagnetic consumable model is heat energy.
As the scheme of microwave-heating biomass of the present invention Yu a kind of optimization of the analogy method of charcoal biased sample transient temperature,
Described step 5) in), during setting up described biased sample model heat distribution model in pyrolytic process according to described heat energy,
Consider the heat exchange of described reactor model and described biased sample model and external environment condition.
As the scheme of microwave-heating biomass of the present invention Yu a kind of optimization of the analogy method of charcoal biased sample transient temperature,
Described step 5) in, in described pyrolytic process, monitor reactor model described in described microwave-heating system geometric model in real time
And the highest pyrolysis temperature of described biased sample model, when the highest pyrolysis temperature reaches predetermined temperature, by described microwave-heating system
Described in system geometric model, the microwave power of microwave generating apparatus model switches to low-power shelves, when the highest pyrolysis temperature is less than setting
During temperature, the microwave power of microwave generating apparatus model described in described microwave-heating system geometric model is switched to high power shelves.
As the scheme of microwave-heating biomass of the present invention Yu a kind of optimization of the analogy method of charcoal biased sample transient temperature,
Described step 6) in, utilize the frequency domain stable state solver in COMSOL Multiphysics 5.0 multiple physical field finite element software to obtain
To described electromagnetic field and the electromagnetic field of electromagnetic consumable model and electromagnetic consumable, utilize COMSOL Multiphysics 5.0 multiple physical field
Transient state solver in finite element software obtains the thermal field in described heat distribution model；Utilize MUMPS algorithm respectively to described electricity
Magnetic field and electromagnetic consumable and described thermal field calculate, and obtain electromagnetic field and the electromagnetic consumable of described microwave-heating system geometric model
3D scattergram and described biased sample model 3D scattergram of temperature under microwave radiation.
As it has been described above, the microwave-heating biomass of the present invention and the analogy method of charcoal biased sample transient temperature, have following
Beneficial effect:
1) analogy method of the present invention can three dimensional temperature distribution in quick obtaining biased sample pyrolytic process；
2) analogy method of the present invention obtains the highest pyrolysis temperature that can obtain universe in real time, quickly obtains focus position, and beautiful
Sight clearly indicates thermograde；
3) analogy method of the present invention is capable of after being warming up to assigned temperature, effectively carries out microwave power shearing, to prevent
Focus and the appearance of temperature runaway phenomenon.
4) analogy method of the present invention, method is simple, it is easy to operation, it is possible to altitude simulation biomass and charcoal biased sample exist
The 3D scattergram of temperature under microwave radiation.
Accompanying drawing explanation
Fig. 1 is the microwave-heating biomass flow chart with the analogy method of charcoal biased sample transient temperature of the present invention.
Detailed description of the invention
Below by way of specific instantiation, embodiments of the present invention being described, those skilled in the art can be by disclosed by this specification
Content understand other advantages and effect of the present invention easily.The present invention can also be added by the most different detailed description of the invention
To implement or application, the every details in this specification can also be based on different viewpoints and application, in the essence without departing from the present invention
Various modification or change is carried out under god.
Refer to accompanying drawing 1.It should be noted that the diagram provided in the present embodiment illustrates the base of the present invention the most in a schematic way
This conception, though component count, shape and chi when only showing the assembly relevant with the present invention rather than implement according to reality in graphic
Very little drafting, during its actual enforcement, the kenel of each assembly, quantity and ratio can be a kind of random change, and its assembly layout kenel
It is likely to increasingly complex.
The present invention provides the analogy method of a kind of microwave-heating biomass and charcoal biased sample transient temperature, as it is shown in figure 1,
Described analogy method at least comprises the following steps:
S1: obtain biomass and the dielectric property-temperature curve sidelights on of the charcoal corresponding with described biomass respectively；
S2: described biomass and described charcoal are mixed to get biased sample, according to biomass described in described biased sample with
The mass ratio of described charcoal, the dielectric property-temperature curve sidelights on of described biomass and the dielectric property-temperature of described charcoal
Curve sidelights on obtain described biased sample dielectric property in pyrolytic process-temperature curve sidelights on；
S3: set up the geometric model of microwave-heating system, the geometric model of described microwave-heating system includes microwave generating apparatus
Model, reactor model and the model of described biased sample, described reactor model is positioned at described microwave generating apparatus model,
Described biased sample model is positioned at described reactor model；
S4: according to the dielectric property-temperature curve sidelights on of described microwave-heating system geometric model and described biased sample, set up institute
State electromagnetic field and the electromagnetic consumable model of microwave-heating system geometric model；
S5: be heat energy by the electromagnetic energy in described electromagnetic field and electromagnetic consumable model, sets up described mixing according to described heat energy
Instance model heat distribution model in pyrolytic process；
S6: utilize the tetrahedral grid technique of painting that described electromagnetic field and electromagnetic consumable model and described heat distribution model are carried out stress and strain model,
Utilize distributed algorithm in the electromagnetic field in described electromagnetic field and electromagnetic consumable model and electromagnetic consumable and described heat distribution model
Thermal field carries out computing, obtains the described electromagnetic field of microwave-heating system geometric model and the 3D scattergram of electromagnetic consumable and described mixed
Close the 3D distribution of instance model temperature under microwave radiation.
Combine accompanying drawing below by specific embodiment and microwave-heating biomass and the charcoal biased sample transient state of the present invention are discussed in detail
The analogy method of temperature.
Embodiment one
It is the granule of 80 mesh that rice straw raw material is pulverized with pulverizer in advance, then delivers to blast drier, heats under the conditions of 105 DEG C
Under be dried to biodiversity content be 0.4%.Dried rice straw is placed in N2Atmosphere is pyrolyzed, and utilizes Hewlett
Packard 8753C vector network analyzer obtains described rice straw dielectric property-temperature curve side under 2.45GHz frequency
Write；Caulis et Folium Oryzae carbon is placed in N2Atmosphere is pyrolyzed, and utilizes Hewlett Packard 8753C vector network analyzer to obtain described rice
Grass carbon dielectric property-temperature curve sidelights under 2.45GHz frequency.Rice straw and Caulis et Folium Oryzae carbon mix according to the mass ratio of 6:1
Form biased sample, according to rice straw described in described biased sample and the mass ratio of described Caulis et Folium Oryzae carbon, described rice straw
The dielectric property of dielectric property-temperature curve sidelights on and described Caulis et Folium Oryzae carbon-temperature curve sidelights on obtain described biased sample and had been pyrolyzed
Dielectric property in journey-temperature curve sidelights on.
The GEO module in COMSOL Multiphysics 5.0 multiple physical field finite element software is utilized to set up according to 1:1 ratio
The geometric model of microwave-heating system, the geometric model of described microwave-heating system includes microwave generating apparatus model, reactor
Model and the model of described biased sample, described reactor model is positioned at described microwave generating apparatus model, described biased sample
Model is positioned at described reactor model；Described microwave generating apparatus model is double crevasse microwave reaction mounted casts, described reaction
Device model is spherical quartz reaction bulb model.And with this geometric model as framework, the dielectric property-temperature with described biased sample is bent
Line side is written as foundation, utilizes the RF module in COMSOL Multiphysics 5.0 multiple physical field finite element software, foundation
The electromagnetic field of microwave-heating system geometric model described in Maxwell establishing equation and electromagnetic consumable model.Then, COMSOL is utilized
Heat transfer module in Multiphysics 5.0 multiple physical field finite element software according to Poynting theorem quantitative description electromagnetic energy is
Heat energy, utilizes conservation of energy principle to set up the heat distribution model in described biased sample pyrolytic process, sets up institute according to described heat energy
During stating biased sample model heat distribution model in pyrolytic process, it is considered to described reactor model and described biased sample
Model and the heat exchange of external environment condition；Further, in described pyrolytic process, monitor in real time in described microwave-heating system geometric model
Described reactor model and the highest pyrolysis temperature of described biased sample model, when the highest pyrolysis temperature reaches predetermined temperature, will
Described in described microwave-heating system geometric model, the microwave power of microwave generating apparatus model switches to low-power shelves, when the highest heat
When solving temperature less than design temperature, by the microwave power of microwave generating apparatus model described in described microwave-heating system geometric model
Switching to high power shelves, such as, predetermined temperature is 600 DEG C, first uses the power shelves of 500W to heat, when the highest pyrolysis
When temperature reaches 600 DEG C, power shelves are returned 0W；When the highest pyrolysis temperature is less than 600 DEG C, retells power shelves and recall to 500W,
The most repeatedly.After all models have been set up, utilize the tetrahedral grid technique of painting to described electromagnetic field and electromagnetic consumable model and institute
State heat distribution model and carry out stress and strain model, the frequency domain in recycling COMSOL Multiphysics 5.0 multiple physical field finite element software
Stable state solver obtains described electromagnetic field and the electromagnetic field of electromagnetic consumable model and electromagnetic consumable, utilizes COMSOL
Transient state solver in Multiphysics 5.0 multiple physical field finite element software obtains the thermal field in described heat distribution model；Utilize
Described electromagnetic field and electromagnetic consumable and described thermal field are calculated by MUMPS algorithm respectively, obtain described microwave-heating system several
The 3D distribution of what electromagnetic field of model and the 3D scattergram of electromagnetic consumable and described biased sample model temperature under microwave radiation
Figure.
Embodiment two
It is the granule of 80 mesh that broken wood raw material is pulverized with pulverizer in advance, then delivers to blast drier, under the conditions of 105 DEG C under heating
Be dried to biodiversity content be 0.3%.Dried wood fragments bits are placed in N2Atmosphere is pyrolyzed, and utilizes Hewlett Packard
8753C vector network analyzer obtains described wood fragments bits dielectric property-temperature curve under 2.45GHz frequency；Charcoal is put
In N2Atmosphere is pyrolyzed, and utilizes Hewlett Packard 8753C vector network analyzer to obtain described charcoal at 2.45GHz
Dielectric property under frequency-temperature curve sidelights on.Wood fragments bits and charcoal are mixed to form biased sample according to the mass ratio of 8:1, depend on
According to the bits of wood fragments described in described biased sample and the mass ratio of described charcoal, the dielectric property-temperature curve sidelights on of described wood fragments bits
And the dielectric property-temperature curve sidelights on of described charcoal obtain dielectric property-temperature that described biased sample collects at pyrolytic process
Curve sidelights on.
The GEO module utilizing COMSOL Multiphysics 5.0 multiple physical field finite element software sets up microwave thermal according to 1:1 ratio
The geometric model of solution system, the geometric model of described microwave-heating system include microwave generating apparatus model, reactor model and
The model of described biased sample, described reactor model is positioned at described microwave generating apparatus model, described biased sample model position
In described reactor model；Described microwave generating apparatus model is double crevasse microwave reaction mounted casts, described reactor model
For spherical quartz reaction bulb model.And with this geometric model as framework, with the dielectric property-temperature curve sidelights on of described biased sample
For foundation, the RF module in COMSOL Multiphysics 5.0 multiple physical field finite element software, according to Maxwell establishing equation
The electromagnetic field of described microwave-heating system geometric model and electromagnetic consumable model.Then, COMSOL Multiphysics 5.0 is utilized
Heat transfer module in multiple physical field finite element software is heat energy according to Poynting theorem quantitative description electromagnetic energy, utilizes energy
Conservation principle sets up the heat distribution model in described biased sample pyrolytic process, sets up described biased sample model according to described heat energy
During heat distribution model in pyrolytic process, it is considered to described reactor model and described biased sample model and external environment condition
Heat exchange；Further, in described pyrolytic process, reactor model described in described microwave-heating system geometric model is monitored in real time
And the highest pyrolysis temperature of described biased sample model, when the highest pyrolysis temperature reaches predetermined temperature, by described microwave-heating system
Described in system geometric model, the microwave power of microwave generating apparatus model switches to low-power shelves, when the highest pyrolysis temperature is less than setting
During temperature, the microwave power of microwave generating apparatus model described in described microwave-heating system geometric model is switched to high power shelves,
Such as, predetermined temperature is 400 DEG C, first uses the power shelves of 300W to heat, when the highest pyrolysis temperature reaches 400 DEG C, and will
Power shelves return 0W；When the highest pyrolysis temperature is less than 400 DEG C, retells power shelves and recall to 300W, the most repeatedly.At all models
After foundation completes, utilize the tetrahedral grid technique of painting that described electromagnetic field and electromagnetic consumable model and described heat distribution model are carried out grid
Dividing, the frequency domain stable state solver in recycling COMSOL Multiphysics 5.0 multiple physical field finite element software obtains described electricity
Magnetic field and the electromagnetic field of electromagnetic consumable model and electromagnetic consumable, utilize COMSOL Multiphysics 5.0 multiple physical field finite element soft
Transient state solver in part obtains the thermal field in described heat distribution model；MUMPS algorithm is utilized respectively described electromagnetic field and electromagnetism to be damaged
Consumption and described thermal field calculate, obtain the described electromagnetic field of microwave-heating system geometric model and the 3D scattergram of electromagnetic consumable and
Described biased sample model is the 3D scattergram of temperature under microwave radiation.
Embodiment three
It is the granule of 60 mesh that brown coal raw material is pulverized with pulverizer in advance, then delivers to blast drier, dry under heating under the conditions of 105 DEG C
Dry to biodiversity content be 0.2%.Dried brown coal are placed in N2Atmosphere is pyrolyzed, and utilizes Hewlett Packard 8753C
Vector network analyzer obtains described brown coal dielectric property-temperature curve sidelights under 2.45GHz frequency；Activated carbon is placed in
N2Atmosphere is pyrolyzed, and utilizes Hewlett Packard 8753C vector network analyzer to obtain described activated carbon at 2.45GHz frequency
Dielectric property-temperature curve under rate.Brown coal and activated carbon are mixed to form biased sample according to the mass ratio of 5:1, according to described mixed
Close brown coal described in sample and the mass ratio of described activated carbon, the dielectric property-temperature curve sidelights on of described brown coal and described activated carbon
Dielectric property-temperature curve sidelights on obtain described biased sample dielectric property in pyrolytic process-temperature curve sidelights on.
The GEO module in COMSOL Multiphysics 5.0 multiple physical field finite element software is utilized to set up microwave according to 1:1 ratio
The geometric model of pyrolysis system, the geometric model of described microwave-heating system includes microwave generating apparatus model, reactor model
And the model of described biased sample, described reactor model is positioned at described microwave generating apparatus model, described biased sample model
It is positioned at described reactor model；Described microwave generating apparatus model is single crevasse microwave reaction mounted cast, described reactor mould
Type is special cylindrical quartz reaction bulb model.And with this geometric model as framework, with the dielectric property-temperature of described biased sample
Curvilinear sides is written as foundation, utilizes the RF module in COMSOL Multiphysics 5.0 multiple physical field finite element software, foundation
The electromagnetic field of microwave-heating system geometric model described in Maxwell establishing equation and electromagnetic consumable model.Then, COMSOL is utilized
Heat transfer module in Multiphysics 5.0 multiple physical field finite element software is according to Poynting theorem quantitative description electromagnetic energy
For heat energy, utilize conservation of energy principle to set up the heat distribution model in described biased sample pyrolytic process, set up according to described heat energy
During described biased sample model heat distribution model in pyrolytic process, it is considered to described reactor model and described aggregate sample
Product model and the heat exchange of external environment condition；Further, in described pyrolytic process, described microwave-heating system geometric model is monitored in real time
Described in reactor model and the highest pyrolysis temperature of described biased sample model, when the highest pyrolysis temperature reaches predetermined temperature,
The microwave power of microwave generating apparatus model described in described microwave-heating system geometric model is switched to low-power shelves, when the highest
When pyrolysis temperature is less than design temperature, by the microwave merit of microwave generating apparatus model described in described microwave-heating system geometric model
Rate switches to high power shelves, and such as, predetermined temperature is 500 DEG C, first uses the power shelves of 300W to heat, when the highest pyrolysis temperature
When degree reaches 500 DEG C, power shelves are returned 0W；When the highest pyrolysis temperature is less than 500 DEG C, retells power shelves and recall to 300W, as
This is repeatedly.After all models have been set up, utilize the tetrahedral grid technique of painting to described electromagnetic field and electromagnetic consumable model and described
Heat distribution model carries out stress and strain model, and the frequency domain in recycling COMSOL Multiphysics 5.0 multiple physical field finite element software is steady
State solver obtains described electromagnetic field and the electromagnetic field of electromagnetic consumable model and electromagnetic consumable, utilizes COMSOL Multiphysics
Transient state solver in 5.0 multiple physical field finite element softwares obtains the thermal field in described heat distribution model；Utilize MUMPS algorithm respectively
Described electromagnetic field and electromagnetic consumable and described thermal field are calculated, obtain described microwave-heating system geometric model electromagnetic field and
The 3D scattergram of electromagnetic consumable and the described biased sample model 3D scattergram of temperature under microwave radiation.
In sum, the present invention provides the analogy method of a kind of microwave-heating biomass and charcoal biased sample transient temperature, institute
State analogy method to comprise the following steps: 1) obtain respectively the dielectric property of biomass and the charcoal corresponding with described biomass-
Temperature curve sidelights on；2) described biomass and described charcoal are mixed to get biased sample, described in described biased sample
Biomass and the mass ratio of described charcoal, the dielectric property-temperature curve sidelights on of described biomass and the dielectricity of described charcoal
Matter-temperature curve sidelights on obtain described biased sample dielectric property in pyrolytic process-temperature curve sidelights on；3) microwave thermal is set up
The geometric model of solution system, the geometric model of described microwave-heating system include microwave generating apparatus model, reactor model and
The model of described biased sample, described reactor model is positioned at described microwave generating apparatus model, described biased sample model position
In described reactor model；4) according to described microwave-heating system geometric model and the dielectric property-temperature of described biased sample
Curve sidelights on, set up electromagnetic field and the electromagnetic consumable model of described microwave-heating system geometric model；5) by described electromagnetic field and electricity
Electromagnetic energy in magnetic loss model is heat energy, sets up described biased sample model heat in pyrolytic process according to described heat energy
Distributed model；6) utilize the tetrahedral grid technique of painting that described electromagnetic field and electromagnetic consumable model and described heat distribution model are carried out grid
Divide, utilize distributed algorithm to the electromagnetic field in described electromagnetic field and electromagnetic consumable model and electromagnetic consumable and described heat distribution mould
Thermal field in type carries out computing, obtain the described electromagnetic field of microwave-heating system geometric model and the 3D scattergram of electromagnetic consumable and
The 3D distribution of described biased sample model temperature under microwave radiation.The analogy method of the present invention can quick obtaining biased sample
Three dimensional temperature distribution in pyrolytic process；The analogy method of the present invention obtains the highest pyrolysis temperature that can obtain universe in real time, quickly obtains
Focus position, and attractive in appearance clearly indicate thermograde；The analogy method of the present invention is capable of being warming up to appointment temperature
After degree, effectively carry out microwave power shearing, to prevent focus and the appearance of temperature runaway phenomenon；The analogy method of the present invention, method
Simply, it is easy to operation, it is possible to altitude simulation biomass and charcoal biased sample be the 3D scattergram of temperature under microwave radiation.
So, the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
The principle of above-described embodiment only illustrative present invention and effect thereof, not for limiting the present invention.Any it is familiar with this skill
Above-described embodiment all can be modified under the spirit and the scope of the present invention or change by the personage of art.Therefore, such as
All that in art, tool usually intellectual is completed under without departing from disclosed spirit and technological thought etc.
Effect is modified or changes, and must be contained by the claim of the present invention.
Claims (10)
1. microwave-heating biomass and the analogy method of charcoal biased sample transient temperature, it is characterised in that described analogy method
Comprise the following steps:
1) biomass and the dielectric property-temperature curve sidelights on of the charcoal corresponding with described biomass are obtained respectively；
2) described biomass and described charcoal are mixed to get biased sample, according to biomass described in described biased sample and institute
State the dielectric property of the mass ratio of charcoal, the dielectric property-temperature curve sidelights on of described biomass and described charcoal-
Temperature curve sidelights on obtain described biased sample dielectric property in pyrolytic process-temperature curve sidelights on；
3) setting up the geometric model of microwave-heating system, the geometric model of described microwave-heating system includes microwave generating apparatus mould
Type, reactor model and the model of described biased sample, described reactor model is positioned at described microwave generating apparatus model
In, described biased sample model is positioned at described reactor model；
4) according to the dielectric property-temperature curve sidelights on of described microwave-heating system geometric model and described biased sample, institute is set up
State electromagnetic field and the electromagnetic consumable model of microwave-heating system geometric model；
5) it is heat energy by the electromagnetic energy in described electromagnetic field and electromagnetic consumable model, sets up described aggregate sample according to described heat energy
Product model heat distribution model in pyrolytic process；
6) utilize the tetrahedral grid technique of painting that described electromagnetic field and electromagnetic consumable model and described heat distribution model are carried out stress and strain model,
Utilize distributed algorithm to the electromagnetic field in described electromagnetic field and electromagnetic consumable model and electromagnetic consumable and described heat distribution
Thermal field in model carries out computing, obtains electromagnetic field and the 3D of electromagnetic consumable of described microwave-heating system geometric model
The 3D distribution of scattergram and described biased sample model temperature under microwave radiation.
Microwave-heating biomass the most according to claim 1 and the analogy method of charcoal biased sample transient temperature, its feature exists
In: described step 1) in, the dielectric property-temperature obtaining biomass and the charcoal corresponding with described biomass respectively is bent
Line side is write and is comprised the following steps:
11) provide biomass, be dried after described biomass are pulverized；
12) dried described biomass are placed in N2Atmosphere is pyrolyzed, utilizes Hewlett Packard 8753C vector network to divide
Analyzer obtains the dielectric property-temperature curve sidelights on of described biomass under 2.45GHz frequency；
13) described charcoal is placed in N2Atmosphere is pyrolyzed, utilizes Hewlett Packard 8753C vector network analyzer to exist
Dielectric property-temperature curve the sidelights on of described charcoal are obtained under 2.45GHz frequency.
Microwave-heating biomass the most according to claim 1 and the analogy method of charcoal biased sample transient temperature, its feature exists
In: described step 1) in, described biomass include rice straw, wood fragments bits or brown coal；Described charcoal be Caulis et Folium Oryzae carbon or
Activated carbon.
Microwave-heating biomass the most according to claim 1 and the analogy method of charcoal biased sample transient temperature, its feature exists
In: described step 2) in, according to biomass described in described biased sample and the mass ratio of described charcoal, described biology
The dielectric property of the dielectric property of matter-temperature curve sidelights on and described charcoal-temperature curve sidelights on, use LLLE formula meter
Calculating and obtain described biased sample dielectric property-temperature curve sidelights in pyrolytic process, described LLLE formula is:
Wherein, ε is the dielectric property of biased sample, including dielectric constant, dielectric loss factor；viFor biological in biased sample
Matter or the mass fraction of charcoal；εiFor biomass in biased sample or the dielectric property of charcoal, including dielectric constant,
Dielectric loss factor.
Microwave-heating biomass the most according to claim 1 and the analogy method of charcoal biased sample transient temperature, its feature exists
In: described step 3) in, utilize the GEO module in COMSOL Multiphysics 5.0 multiple physical field finite element software
The geometric model of described microwave-heating system is set up according to the ratio of 1:1.
Microwave-heating biomass the most according to claim 1 and the analogy method of charcoal biased sample transient temperature, its feature exists
In: described step 4) in, utilize the RF module root in COMSOL Multiphysics 5.0 multiple physical field finite element software
Electromagnetic field and electromagnetic consumable model according to microwave-heating system geometric model described in Maxwell establishing equation.
Microwave-heating biomass the most according to claim 1 and the analogy method of charcoal biased sample transient temperature, its feature exists
In: described step 5) in, utilize the heat transfer module in COMSOL Multiphysics 5.0 multiple physical field finite element software
It is heat energy by the electromagnetic energy in described electromagnetic field and electromagnetic consumable model.
Microwave-heating biomass the most according to claim 1 and the analogy method of charcoal biased sample transient temperature, its feature exists
In: described step 5) in), set up described biased sample model heat distribution model in pyrolytic process according to described heat energy
During, it is considered to described reactor model and described biased sample model and the heat exchange of external environment condition.
Microwave-heating biomass the most according to claim 1 and the analogy method of charcoal biased sample transient temperature, its feature exists
In: described step 5) in, in described pyrolytic process, monitor in real time described in described microwave-heating system geometric model and react
Device model and the highest pyrolysis temperature of described biased sample model, when the highest pyrolysis temperature reaches predetermined temperature, by described micro-
Described in ripple pyrolysis system geometric model, the microwave power of microwave generating apparatus model switches to low-power shelves, when the highest pyrolysis temperature
When degree is less than design temperature, the microwave power of microwave generating apparatus model described in described microwave-heating system geometric model is cut
Shift to high power shelves.
Microwave-heating biomass the most according to claim 1 and the analogy method of charcoal biased sample transient temperature, it is special
Levy and be: described step 6) in, utilize the frequency domain in COMSOL Multiphysics 5.0 multiple physical field finite element software
Stable state solver obtains described electromagnetic field and the electromagnetic field of electromagnetic consumable model and electromagnetic consumable, utilizes COMSOL
Transient state solver in Multiphysics 5.0 multiple physical field finite element software obtains the thermal field in described heat distribution model；Utilize
Described electromagnetic field and electromagnetic consumable and described thermal field are calculated by MUMPS algorithm respectively, obtain described microwave-heating system
The electromagnetic field of geometric model and the 3D scattergram of electromagnetic consumable and described biased sample model 3D of temperature under microwave radiation
Scattergram.
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| CN114449694B (en) * | 2020-10-19 | 2024-05-07 | 中国石油化工股份有限公司 | Memory, temperature control method, system and device of microwave heating system |
| WO2022109749A1 (en) * | 2020-11-26 | 2022-06-02 | The University Of New Brunswick | Method for producing a high-phenolic-content biooil |
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