CN114621778B - Memory, biomass microwave pyrolysis process temperature control method, device and equipment - Google Patents
Memory, biomass microwave pyrolysis process temperature control method, device and equipment Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 84
- 239000002028 Biomass Substances 0.000 title claims abstract description 68
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 47
- 230000008569 process Effects 0.000 title claims abstract description 44
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 57
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- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
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- 239000000126 substance Substances 0.000 description 2
- 206010021143 Hypoxia Diseases 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
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Abstract
The invention discloses a memory, a temperature control method, a temperature control device and temperature control equipment for biomass microwave pyrolysis technology, wherein the temperature control method comprises the following steps: modeling according to a continuously fed microwave reactor, generating a three-dimensional electromagnetic field model and meshing; dividing an inner cavity of the microwave reactor into a preset number of temperature control areas according to the three-dimensional electromagnetic field model, and respectively setting target temperature intervals of the temperature control areas; acquiring input parameters of a three-dimensional electromagnetic field model; taking a preset time step as a calculation period, and calculating according to input parameters to obtain a simulation result of the three-dimensional electromagnetic field model; and respectively judging whether each temperature control zone comprises grids exceeding a target temperature zone according to the temperature predicted value of each temperature control zone, if so, adjusting the controllable microwave source of the unit grids exceeding the target temperature zone according to a preset rule, and taking the adjusted microwave power as the current microwave power. The temperature control effect of the microwave reactor can be improved by improving the response time of the temperature control of the microwave pyrolysis process of the biomass heated by microwaves.
Description
Technical Field
The invention relates to the field of chemical technology, in particular to a temperature control method, a temperature control device and temperature control equipment for a memory and biomass microwave pyrolysis technology.
Background
Biomass pyrolysis, which generally refers to the process of producing coke, condensable fluid and gaseous products by heating biomass to raise the temperature to cause molecular decomposition in an anaerobic or hypoxic environment, is an important utilization form of biomass energy.
In the biomass fast pyrolysis process, biomass raw materials are rapidly heated to a higher reaction temperature under the anoxic condition, so that the decomposition of macromolecules is initiated, and micromolecular gas, condensable volatile matters and a small amount of coke products are generated.
Microwave heating is a common heating mode for biomass fast pyrolysis, and has the characteristics of high heating rate, short residence time, proper pyrolysis temperature and the like compared with other pyrolysis modes, so that the microwave heating has development prospect in the field of chemical application.
The inventor finds that at least the following defects exist in the prior art through research:
the microwave heating has the characteristics of high heating rate and short residence time, so that the response aging requirement on temperature control is very high, and the problem of poor control effect caused by overlong response time in the temperature control method in the prior art easily occurs.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to improve the temperature control effect of a microwave reactor by improving the response time of the temperature control of a microwave pyrolysis process of microwave heating biomass.
The invention provides a temperature control method for biomass microwave pyrolysis technology, which comprises the following steps:
s11, modeling according to a continuously fed microwave reactor, generating a three-dimensional electromagnetic field model of the microwave reactor and gridding the three-dimensional electromagnetic field model;
s12, dividing an inner cavity of the microwave reactor into a preset number of temperature control areas according to the three-dimensional electromagnetic field model, and respectively setting target temperature intervals of the temperature control areas;
s13, acquiring input parameters of the three-dimensional electromagnetic field model, wherein the input parameters comprise: initial microwave power of each controllable microwave source in the microwave reactor, and obtaining physical property parameters and material feeding rate of the biomass;
s14, calculating according to the input parameters by taking a preset time step as a calculation period to obtain a simulation result of the three-dimensional electromagnetic field model; the simulation result comprises a temperature predicted value of each temperature control area after a time step;
s15, judging whether each temperature control area comprises grids exceeding the target temperature interval according to the temperature predicted value of each temperature control area, if so, adjusting the microwave power of the controllable microwave source exceeding the grids of the target temperature interval according to a preset rule, taking the adjusted microwave power of the controllable microwave source as the current microwave power, and returning to the step S14.
In the present invention, further comprising:
and if not, generating the temperature control instruction of the microwave reactor according to the current microwave power.
In the present invention, the preset number includes:
3 to 40.
In the present invention, the dividing the inner cavity of the microwave reactor into a preset number of temperature control areas includes:
the inner cavity of the microwave reactor is divided into a preset number of temperature control areas with equal length, or the inner cavity of the microwave reactor is divided into a preset number of temperature control areas with the same temperature difference according to a temperature rising curve.
In the invention, the modeling according to the microwave reactor, generating a three-dimensional electromagnetic field model of the microwave reactor and gridding the three-dimensional electromagnetic field model, comprises the following steps:
setting the cavity volume of the microwave reactor as V; the number of the controllable microwave sources is n;
let the power of the ith controllable microwave source be P i The total power of the microwave reactor is
The three-dimensional electromagnetic field model after gridding has D grid cells and is stored in a set D, wherein the ith grid belonging to the set DThe electromagnetic strength of the unit is E i At a temperature T i 。
In the present invention, the step of respectively determining whether each temperature control zone includes a grid exceeding the target temperature zone according to the temperature prediction value of each temperature control zone, and if so, adjusting the microwave power of the controllable microwave source exceeding the grid of the target temperature zone according to a preset rule, includes:
the following steps are respectively executed for each temperature control area:
s21, acquiring current microwave power of each controllable microwave source when biomass enters the first time step of the temperature control zone according to the three-dimensional electromagnetic field model;
s22, traversing the maximum temperature point of the grid cells in the temperature control area, and storing the grid cell identification and the temperature data corresponding to the maximum temperature point into a data set Col1 if the maximum temperature point exceeds the upper limit of the target temperature interval;
s23, traversing the minimum temperature point of the grid cells in the temperature control area, and storing the grid cell identification and the temperature data corresponding to the minimum temperature point into a data set Col2 if the minimum temperature point exceeds the lower limit of the target temperature interval;
s24, solving a controllable electric field intensity component range E of which the maximum temperature of the biological material in the grid cell in the temperature control zone in the residual residence time is not more than the upper limit of the target temperature zone according to Maxwell equation of the electric field intensity for the grid cell currently stored in the data set Col1 x-j ，E y-j ，E z-j The method comprises the steps of carrying out a first treatment on the surface of the For the grid cells currently stored in the data set Col2, solving a controllable electric field intensity component range E in which the minimum temperature of the biological material in the grid cells in the temperature control zone in the residual residence time is not lower than the lower limit of the target temperature interval according to Maxwell equation of the electric field intensity x-i ，E y-i ，E z- i；
S25, after the controllable electric field intensity component ranges of all grid units in the collections Col1 and Col2 are obtained, all the controllable microwave sources to which the temperature control area belongs are led to pass through a matrix waveguideThe transmitted forward wave is decomposed, and the components of the forward wave in 3 directions are respectively
S26, traversing all possibilities of the components of the controllable microwave source in the temperature control area on the corresponding time step, and coupling with the components of other temperature control areas to obtain an optimal electric field strength component set for enabling all grid cells in Col1 and Col2 to meet the judgment ruleThe total power of the current temperature control area corresponding to the set is P j And correspondingly adjusting the microwave power of the controllable microwave source to which the temperature control area belongs.
In the invention, the method for parallelizing the three-dimensional electromagnetic field model comprises the following steps:
the grid is a tetrahedral grid or a hexahedral grid.
In another aspect of the present invention, there is also provided a temperature control device for biomass microwave pyrolysis process, including:
the modeling unit is used for modeling according to the continuously fed microwave reactor, generating a three-dimensional electromagnetic field model of the microwave reactor and gridding the three-dimensional electromagnetic field model;
the partition unit is used for dividing the inner cavity of the microwave reactor into temperature control areas with preset numbers according to the three-dimensional electromagnetic field model, and respectively setting target temperature intervals of the temperature control areas;
a parameter acquisition unit, configured to acquire input parameters of the three-dimensional electromagnetic field model, including: initial microwave power of each controllable microwave source in the microwave reactor, and obtaining physical property parameters and material feeding rate of the biomass;
the prediction unit is used for calculating and obtaining a simulation result of the three-dimensional electromagnetic field model according to the input parameters by taking a preset time step as a calculation period; the simulation result comprises a temperature predicted value of each temperature control area after a time step;
and the calculation unit is used for respectively judging whether each temperature control area comprises grids exceeding the target temperature interval according to the temperature predicted value of each temperature control area, if so, adjusting the microwave power of the controllable microwave source exceeding the grids of the target temperature interval according to a preset rule, and taking the adjusted microwave power of the controllable microwave source as the current microwave power.
In another aspect of the invention, a memory is also provided, comprising a software program adapted to be executed by a processor to perform the steps of the biomass microwave pyrolysis process temperature control method described above.
According to the embodiment of the invention, the biomass microwave pyrolysis process temperature control equipment is further provided, the biomass microwave pyrolysis process temperature control equipment comprises a computer program stored on a memory, the computer program comprises program instructions, and when the program instructions are executed by a computer, the computer is enabled to execute the method in each aspect and achieve the same technical effects.
Compared with the prior art, the invention has the following beneficial effects:
the inventor finds that the problem of poor control effect caused by overlong response time easily occurs in the temperature control method in the prior art, and the reason is mainly that the calculated amount is overlarge when the microwave power of each controllable microwave source is calculated according to the three-dimensional electromagnetic field model of the microwave reactor, so that the control action lag is serious; in this way, the microwave power of the controllable microwave source in the grid unit with the temperature not conforming to the standard is adjusted through the temperature predicted value of each temperature control area at the next time step, so that the temperature fluctuation of biomass in the cavity of the microwave reactor is avoided. In the invention, since independent calculation is carried out in each temperature control area, the calculated amount can be effectively reduced, the calculation efficiency can be effectively improved, and the generation efficiency of a final control instruction can be further improved, so that the temperature control effect of the microwave reactor is improved by improving the response time of the temperature control of the microwave heating biomass microwave pyrolysis process, and the temperature rising process of biomass in the cavity of the microwave reactor is more stable and controllable.
The foregoing description is only an overview of the present invention, and it is to be understood that it is intended to provide a more clear understanding of the technical means of the present invention and to enable the technical means to be carried out in accordance with the contents of the specification, while at the same time providing a more complete understanding of the above and other objects, features and advantages of the present invention, and one or more preferred embodiments thereof are set forth below, together with the detailed description given below, along with the accompanying drawings.
Drawings
FIG. 1 is a step diagram of a biomass microwave pyrolysis process temperature control method according to the present invention;
FIG. 2 is a schematic structural view of a temperature control device for biomass microwave pyrolysis process according to the present invention;
fig. 3 is a schematic structural diagram of a temperature control device for a biomass microwave pyrolysis process according to the present invention.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or other components.
Spatially relative terms, such as "below," "beneath," "lower," "above," "upper," and the like, may be used herein for ease of description to describe one element's or feature's relationship to another element's or feature's in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the article in use or operation in addition to the orientation depicted in the figures. For example, if the article in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the elements or features. Thus, the exemplary term "below" may encompass both a direction of below and a direction of above. The article may have other orientations (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terms "first," "second," and the like herein are used for distinguishing between two different elements or regions and are not intended to limit a particular position or relative relationship. In other words, in some embodiments, the terms "first," "second," etc. may also be interchanged with one another.
Example 1
In order to improve the temperature control effect of the microwave reactor by improving the response aging of the temperature control of the microwave heating biomass microwave pyrolysis process, as shown in fig. 1, the embodiment of the invention provides a biomass microwave pyrolysis process temperature control method, which comprises the following steps:
s11, modeling according to a continuously fed microwave reactor, generating a three-dimensional electromagnetic field model of the microwave reactor and gridding the three-dimensional electromagnetic field model;
the embodiment of the invention utilizes a three-dimensional electromagnetic field simulation technology to simulate the temperature distribution data in the cavity of the microwave reactor.
In practical application, the specific way to grid the three-dimensional electromagnetic field model may be:
setting the cavity volume of the microwave reactor as V; the number of the controllable microwave sources is n;
let the power of the ith controllable microwave source be P i The total power of the microwave reactor is
The three-dimensional electromagnetic field model after gridding has D grid cells and is stored in a set D, wherein the electromagnetic intensity of the ith grid cell belonging to the set D is E i At a temperature T i 。
In practical applications, the grid cells in the embodiments of the present invention may take the form of tetrahedrons or hexahedrons.
It should be noted that, in the embodiment of the present invention, the microwave reactor is a continuously fed microwave reactor, and the biomass continuously passes through the cavity of the microwave reactor from the feed inlet of the microwave reactor and exits from the discharge outlet of the microwave reactor; the microwave reactor heats the biomass in the cavity through a plurality of controllable microwave sources arranged in the microwave reactor.
S12, dividing an inner cavity of the microwave reactor into a preset number of temperature control areas according to the three-dimensional electromagnetic field model, and respectively setting target temperature intervals of the temperature control areas;
in the embodiment of the invention, the inner cavity of the microwave reactor is divided into a plurality of temperature control areas, and the specific value of the number of the temperature control areas can be from 3 to 40. Setting a corresponding target temperature interval for each temperature control area; after the inner cavity of the microwave reactor is divided into a plurality of temperature control areas, the temperature predicted value of each temperature control area is calculated independently, so that the calculated amount can be effectively reduced, the calculation efficiency can be improved, and the temperature control response time effect can be improved.
In the embodiment of the present invention, the specific manner of dividing into the plurality of temperature control areas may be:
equally dividing the inner cavity of the microwave reactor into a plurality of temperature control areas;
in addition, the temperature control areas may be divided into a plurality of temperature control areas having the same temperature difference according to the temperature values of the respective positions in the inner cavity of the microwave reactor, for example, the position of each 100 ℃ rise in the inner cavity of each microwave reactor may be used as the dividing position of one temperature control area.
S13, acquiring input parameters of the three-dimensional electromagnetic field model, wherein the input parameters comprise: initial microwave power of each controllable microwave source in the microwave reactor, and obtaining physical property parameters and material feeding rate of the biomass;
before simulating the temperature distribution within the cavity of the microwave reactor, various input parameters that are needed to generate the three-dimensional electromagnetic field model may be physical parameters and material feed rates including the initial microwave power of each controllable microwave source in the microwave reactor and the biomass.
For each temperature control zone, the initial microwave power is the current microwave power of each controllable microwave source in the temperature control zone when biomass just enters at the beginning of a calculation period (namely the current time step).
S14, calculating according to the input parameters by taking a preset time step as a calculation period to obtain a simulation result of the three-dimensional electromagnetic field model; the simulation result comprises a temperature predicted value of each temperature control area after a time step;
in the embodiment of the invention, the simulation result of the three-dimensional electromagnetic field model obtained by calculation according to the input parameters is periodic, namely, the calculation is carried out once every time step is passed; in practical applications, the value of the time step may be determined according to the actual computing capability of the computer and experience of those skilled in the art, and is not specifically limited herein.
In the embodiment of the invention, the purpose of obtaining the simulation result of the three-dimensional electromagnetic field model according to the input parameter calculation is to obtain the temperature predicted value of each temperature control area when the next time step is obtained under the current time step, namely, the temperature predicted value of each temperature control area is pre-judged.
S15, judging whether each temperature control area comprises grids exceeding the target temperature interval according to the temperature predicted value of each temperature control area, if so, adjusting the microwave power of the controllable microwave source exceeding the grids of the target temperature interval according to a preset rule, taking the adjusted microwave power of the controllable microwave source as the current microwave power, and returning to the step S14.
In the embodiment of the invention, each temperature control area needs to be respectively judged to include grid cells exceeding the target temperature interval of the temperature control area when the next time step is needed. In practical application, the method for judging whether each temperature control area comprises grid cells exceeding the target temperature interval and adjusting the microwave power of the controllable microwave source can be performed in parallel or one by one.
Preferably, the specific mode of the step may include:
s21, acquiring current microwave power of each controllable microwave source when biomass enters a current time step of a temperature control zone according to a three-dimensional electromagnetic field model;
for each temperature control zone, when biomass just enters at the beginning of a calculation period (i.e. the current time step), the current microwave power of each controllable microwave source in the temperature control zone can be used as a parameter for temperature prediction of the three-dimensional electromagnetic field model.
S22, traversing the maximum temperature point of the grid cells in the temperature control area, and storing the grid cell identification and the temperature data corresponding to the maximum temperature point into a data set Col1 if the maximum temperature point exceeds the upper limit of a target temperature interval;
in order to determine whether the temperature control area includes grid cells exceeding the upper limit of the target temperature interval and determine which grid cells exceed the upper limit of the target temperature interval, the embodiment of the invention adopts a traversing mode to determine the maximum temperature point of the grid cells in the temperature control area, stores the grid cell identification and the temperature data corresponding to the maximum temperature point into the data set Col1 when the maximum temperature point exceeds the upper limit of the target temperature interval, and then performs the same determination on the rest grid cells, thereby selecting all the grid cells including the grid cells exceeding the upper limit of the target temperature interval, that is, selecting all the grid cells exceeding the upper limit of the target temperature interval in the next time step, and storing the grid cells into the data set Col 1.
S23, traversing the minimum temperature point of the grid cells in the temperature control area, and storing the grid cell identification and the temperature data corresponding to the minimum temperature point into a data set Col2 if the minimum temperature point exceeds the lower limit of the target temperature interval;
in order to prevent the problem that the temperature rise of the biomass does not reach the standard, in the embodiment of the invention, whether the temperature control area comprises grid cells lower than the lower limit of the target temperature interval is also judged, and which grid cells are lower than the lower limit of the target temperature interval is judged.
S24, solving a controllable electric field intensity component range E of which the maximum temperature of the biological material in the grid cell in the temperature control zone in the residual residence time is not more than the upper limit of the target temperature zone according to Maxwell equation of the electric field intensity for the grid cell currently stored in the data set Col1 x-j ，E y-j ，E z-j The method comprises the steps of carrying out a first treatment on the surface of the For the grid cells currently stored in the data set Col2, solving a controllable electric field intensity component range E in which the minimum temperature of the biological material in the grid cells in the temperature control zone in the residual residence time is not lower than the lower limit of the target temperature interval according to Maxwell equation of the electric field intensity x-i ，E y-i ，E z- i；
Specifically, for a certain grid cell j in the data set Col1, assuming that it is irradiated by microwaves in the x-axis direction only, the electric field intensity components in the other two axial directions are 0, and the maximum temperature of the grid cell j in the remaining residence time is equal to the upper limit of the target temperature interval, and the electric field intensity component in the x-axis direction at this time is referred to as E x-j Theoretical maximum value E of (2) xj-max The method comprises the steps of carrying out a first treatment on the surface of the Similarly, E can be obtained y-j ，E z-j Maximum value E of (2) yj-max ，E zj-max . Then according to E x-j ，E y-j ，E z-j Maximum and Maxwell's equations are combined with coordinates in the reaction chamber (i.e., the chamber of the microwave reactor) for grid cell j to build E x-j ，E y-j ，E z-j Is a plane triangle coordinate system (the minimum value of the x-axis of the coordinate system is 0, and the maximum value is E xj-max The y and z axes are the same), the coordinate system is the controllable electric field intensity component range that the maximum temperature of the grid unit j in the residual residence time does not exceed the upper limit of the target temperature interval of the temperature zone.
For a certain grid unit i in the data set Col2, assuming that the grid unit i is only irradiated by microwaves in the x-axis direction, the electric field intensity components in the other two axial directions are 0, and at the moment, the minimum temperature of the grid unit i in the remaining residence time is equal to the lower limit of the target temperature interval, and the electric field intensity component in the x-axis direction at the moment is called E x-i Theoretical minimum value E of (2) xj-min The method comprises the steps of carrying out a first treatment on the surface of the Similarly, E can be obtained y-i ，E z-i Minimum value E of (2) yj-min ，E zj-min . Then according to E x-i ，E y-i ，E z-i Combining the minimum value and Maxwell's equation with the coordinates of the grid unit i in the reaction cavity to establish E x-i ，E y-i ，E z-i Is a plane triangle coordinate system (the minimum value of the x-axis of the coordinate system is E xj-min The maximum value is the component of the electric field intensity, in the x axis, which can be provided by the microwave source under the full power of the temperature control area, and the y and z axes are the same, and the coordinate system is the controllable electric field intensity component range in which the minimum temperature of the grid unit i in the residual residence time does not exceed the lower limit of the target temperature interval of the temperature control area.
S25, after the controllable electric field intensity component ranges of all grid units in the collections Col1 and Col2 are obtained, decomposing forward waves transmitted by all controllable microwave sources belonging to the temperature control area through matrix waveguides, wherein the components of the forward waves in 3 directions are respectively
S26, traversing all possibilities of the components of the controllable microwave source in the temperature control area on the corresponding time step, and coupling with the components of other temperature control areas to obtain an optimal electric field strength component set for enabling all grid cells in Col1 and Col2 to meet the judgment ruleThe total power of the current temperature control area corresponding to the set is P j And correspondingly adjusting the microwave power of the controllable microwave source to which the temperature control area belongs.
In particular canThus, assuming that the current time step is t, for k controllable microwave sources to which the current temperature control region belongs, the components of the forward wave in 3 directions are respectivelyFor the controllable microwave source of the non-current temperature control area, if the controllable microwave source is closer to the direction of the discharge hole than the current temperature control area, the components of the forward wave in 3 directions are consistent with the component value of the current time step t; if the temperature control area is closer to the direction of the feed inlet than the current temperature control area, the components of the forward wave in 3 directions are consistent with the component of the last time step t-1. In the embodiment of the invention, all the possibilities that the component of the controllable microwave source in the current temperature control area exists in the current time step t need to be traversed, namely E related to Col1 needs to be traversed x-j ，E y-j ，E z-j Plane triangular coordinate system E related to Col2 x-i ，E y-i ，E z-i All possibilities on intersection of plane triangular coordinate system and overlapping components of forward wave of non-current temperature control area in 3 directions to obtain optimal electric field intensity component set capable of ensuring maximum temperature of unit grid in Col1 in residual residence time not exceeding upper limit of target temperature interval of temperature control area, and ensuring minimum temperature of unit grid in Col2 in residual residence time not less than lower limit of target temperature interval>
For all possibilities of traversing the existence of the component of the controllable microwave source in the current temperature control zone over the current time step tFor example, the specific acquisition mode is as follows:
setting the number of microwave sources belonging to the current temperature control area as Q, and controlling the intensity component range of the Q controllable electric fieldsSet Q E ＝{E x-1 ，E x-2 ，……，E x-Q From the first element E x-1 Starting traversing, wherein each traversing is required to traverse all elements (which can be for (…)) sentences with intersections, recording the maximum number of element numbers and storing the maximum number of element numbers into a null array a= { } and simultaneously recording the corresponding intersection interval and storing the intersection interval into a null matrix b= { } and finally comparing the maximum number of each traversing result respectively, wherein the maximum number in the array a meets the condition, and the intersection interval stored in the matrix b is the following conditionIs a range of values.
Next to this, the process is carried out,and->Acquisition method and->Similarly, the description is omitted here.
After obtaining the optimum electric field intensity component setThe total power of the current temperature control area corresponding to the set is P j And correspondingly adjusting the microwave power of the controllable microwave source to which the current temperature control area belongs.
Further, in the embodiment of the present invention, the method may further include the steps of:
when each temperature control area does not exceed the grid of the target temperature interval, the temperature control instruction of the microwave reactor can be generated according to the current microwave power. In this way, according to the calculated microwave power of the controllable microwave source to which the current temperature control area belongs, the control scheme of each controllable microwave source of the current temperature control area in the microwave reactor of the entity can be determined, and further the microwave power of each controllable microwave source in the current temperature control area, which should be used in the next time step, can be determined.
In summary, according to the three-dimensional electromagnetic field model, the embodiment of the invention divides the cavity of the microwave reactor into a plurality of temperature control areas, and then performs temperature value pre-judgment on each temperature control area (i.e. calculates the temperature predicted value of each temperature control area after the next time step); in this way, the microwave power of the controllable microwave source in the grid unit with the temperature not conforming to the standard is adjusted through the temperature predicted value of each temperature control area at the next time step, so that the temperature fluctuation of biomass in the cavity of the microwave reactor is avoided. In the invention, since independent calculation is carried out in each temperature control area, the calculated amount can be effectively reduced, the calculation efficiency can be effectively improved, and the generation efficiency of a final control instruction can be further improved, so that the temperature control effect of the microwave reactor is improved by improving the response time of the temperature control of the microwave heating biomass microwave pyrolysis process, and the temperature rising process of biomass in the cavity of the microwave reactor is more stable and controllable.
Example two
In another aspect of the embodiment of the present invention, a temperature control device for a biomass microwave pyrolysis process is provided, and fig. 2 shows a schematic structural diagram of the temperature control device for a biomass microwave pyrolysis process provided in the embodiment of the present invention, where the temperature control device for a biomass microwave pyrolysis process is a device corresponding to the temperature control method for a biomass microwave pyrolysis process in the embodiment corresponding to fig. 1, that is, the temperature control method for a biomass microwave pyrolysis process in the embodiment corresponding to fig. 1 is implemented by means of a virtual device, and each virtual module forming the temperature control device for a biomass microwave pyrolysis process may be executed by an electronic device, for example, a network device, a terminal device, or a server. Specifically, the biomass microwave pyrolysis process temperature control device in the embodiment of the invention comprises:
the modeling unit 01 is used for modeling according to a continuously fed microwave reactor, generating a three-dimensional electromagnetic field model of the microwave reactor and gridding the three-dimensional electromagnetic field model;
the partition unit 02 is used for dividing the inner cavity of the microwave reactor into a preset number of temperature control areas according to the three-dimensional electromagnetic field model, and respectively setting target temperature intervals of the temperature control areas;
the parameter obtaining unit 03 is configured to obtain input parameters of the three-dimensional electromagnetic field model, and includes: initial microwave power of each controllable microwave source in the microwave reactor, and obtaining physical property parameters and material feeding rate of the biomass;
the prediction unit 04 is used for calculating and obtaining a simulation result of the three-dimensional electromagnetic field model according to the input parameters by taking a preset time step as a calculation period; the simulation result comprises a temperature predicted value of each temperature control area after a time step;
the calculating unit 05 is configured to determine, according to the temperature predicted values of the temperature control areas, whether each temperature control area includes a grid exceeding the target temperature interval, and if so, adjust the microwave power of the controllable microwave source exceeding the grid of the target temperature interval according to a preset rule, where the adjusted microwave power of the controllable microwave source is used as the current microwave power.
Preferably, in an embodiment of the present invention, an instruction generating unit (not shown in the figure) may be further included, for generating the microwave reactor temperature control instruction according to the current microwave power when each of the temperature control areas does not exceed the grid of the target temperature interval.
Because the working principle and the beneficial effects of the temperature control device for the biomass microwave pyrolysis process in the embodiment of the invention have been described and illustrated in the temperature control method for the biomass microwave pyrolysis process corresponding to fig. 1, the temperature control device can be referred to each other, and the description thereof will not be repeated here.
Example III
In an embodiment of the present invention, a memory is further provided, where the memory includes a software program, and the software program is adapted to execute each step in the biomass microwave pyrolysis process temperature control method corresponding to fig. 1 by using a processor.
The embodiment of the invention can be realized by a software program mode, namely, the software program (and an instruction set) for realizing each step in the biomass microwave pyrolysis process temperature control method corresponding to fig. 1 is written, the software program is stored in a storage device, and the storage device is arranged in a computer device, so that a processor of the computer device can call the software program to realize the aim of the embodiment of the invention.
Example IV
In the embodiment of the invention, a temperature control device for biomass microwave pyrolysis process is also provided, and a corresponding computer program product is included in a memory included in the temperature control device for biomass microwave pyrolysis process, and when program instructions included in the computer program product are executed by a computer, the computer can execute the temperature control method for biomass microwave pyrolysis process in the above aspects, and the same technical effects are achieved.
Fig. 3 is a schematic hardware structure of a biomass microwave pyrolysis process temperature control device as an electronic device according to an embodiment of the invention, and as shown in fig. 3, the device includes one or more processors 610, a bus 630, and a memory 620. Taking a processor 610 as an example, the apparatus may further comprise: input means 640, output means 650.
The processor 610, memory 620, input devices 640, and output devices 650 may be connected by a bus or otherwise, as exemplified in fig. 3 by bus 630.
Memory 620, as a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules. The processor 610 executes various functional applications of the electronic device and data processing, i.e., implements the processing methods of the method embodiments described above, by running non-transitory software programs, instructions, and modules stored in the memory 620.
Memory 620 may include a storage program area that may store an operating system, at least one application program required for functionality, and a storage data area; the storage data area may store data, etc. In addition, memory 620 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 620 optionally includes memory remotely located relative to processor 610, which may be connected to the processing device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 640 may receive input numeric or character information and generate signal inputs. The output 650 may include a display device such as a display screen.
The one or more modules are stored in the memory 620 and, when executed by the one or more processors 610, perform:
s11, modeling according to a continuously fed microwave reactor, generating a three-dimensional electromagnetic field model of the microwave reactor and gridding the three-dimensional electromagnetic field model;
s12, dividing an inner cavity of the microwave reactor into a preset number of temperature control areas according to the three-dimensional electromagnetic field model, and respectively setting target temperature intervals of the temperature control areas;
s13, acquiring input parameters of the three-dimensional electromagnetic field model, wherein the input parameters comprise: initial microwave power of each controllable microwave source in the microwave reactor, and obtaining physical property parameters and material feeding rate of the biomass;
s14, calculating according to the input parameters by taking a preset time step as a calculation period to obtain a simulation result of the three-dimensional electromagnetic field model; the simulation result comprises a temperature predicted value of each temperature control area after a time step;
s15, judging whether each temperature control area comprises grids exceeding the target temperature interval according to the temperature predicted value of each temperature control area, if so, adjusting the microwave power of the controllable microwave source exceeding the grids of the target temperature interval according to a preset rule, taking the adjusted microwave power of the controllable microwave source as the current microwave power, and returning to the step S14.
The product can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. Technical details not described in detail in this embodiment may be found in the methods provided in other embodiments of the present invention.
In the several embodiments provided in the present invention, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage device, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage device includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), reRAM, MRAM, PCM, NAND Flash, NOR Flash, memristor, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The temperature control method for the biomass microwave pyrolysis process is characterized by comprising the following steps of:
s11, modeling according to a continuously fed microwave reactor, generating a three-dimensional electromagnetic field model of the microwave reactor and gridding the three-dimensional electromagnetic field model, wherein the method comprises the following steps of:
setting the cavity volume of the microwave reactor as V; the number of the controllable microwave sources is n;
let the power of the ith controllable microwave source be P i The total power of the microwave reactor is
The three-dimensional electromagnetic field model after gridding has D grid cells and is stored in a set D, wherein the electromagnetic intensity of the ith grid cell belonging to the set D is E i At a temperature T i ；
S12, dividing an inner cavity of the microwave reactor into a preset number of temperature control areas according to the three-dimensional electromagnetic field model, and respectively setting target temperature intervals of the temperature control areas;
s13, acquiring input parameters of the three-dimensional electromagnetic field model, wherein the input parameters comprise: the initial microwave power of each controllable microwave source in the microwave reactor, and the physical property parameters and the material feeding rate of the biomass;
s14, calculating according to the input parameters by taking a preset time step as a calculation period to obtain a simulation result of the three-dimensional electromagnetic field model; the simulation result comprises a temperature predicted value of each temperature control area after a time step;
s15, judging whether each temperature control zone comprises grids exceeding the target temperature zone according to the temperature predicted value of each temperature control zone, if so, adjusting the microwave power of the controllable microwave source exceeding the grids of the target temperature zone according to a preset rule, taking the adjusted microwave power of the controllable microwave source as the current microwave power, and returning to the step S14, wherein the step S14 comprises the following steps:
the following steps are respectively executed for each temperature control area:
s21, acquiring current microwave power of each controllable microwave source when biomass enters the first time step of the temperature control zone according to the three-dimensional electromagnetic field model;
s22, traversing the maximum temperature point of the grid cells in the temperature control area, and storing the grid cell identification and the temperature data corresponding to the maximum temperature point into a data set Col1 if the maximum temperature point exceeds the upper limit of the target temperature interval;
s23, traversing the minimum temperature point of the grid cells in the temperature control area, and storing the grid cell identification and the temperature data corresponding to the minimum temperature point into a data set Col2 if the minimum temperature point exceeds the lower limit of the target temperature interval;
s24, solving a controllable electric field intensity component range Ex-j, ey-j and Ez-j of which the maximum temperature of the biological material in the grid cell in the temperature control zone in the residual residence time is not more than the upper limit of the target temperature zone according to a Maxwell equation of the electric field intensity for the grid cell currently stored in the data set Col 1; for the grid cells currently stored in the data set Col2, solving a controllable electric field intensity component range Ex-i, ey-i and Ez-i of which the minimum temperature of the biological material in the grid cells in the temperature control zone in the residual residence time is not lower than the lower limit of the target temperature zone according to a Maxwell equation of the electric field intensity;
s25, after the controllable electric field intensity component ranges of all grid units in the collections Col1 and Col2 are obtained, decomposing forward waves transmitted by all controllable microwave sources belonging to the temperature control area through a matrix waveguide, wherein the components of the forward waves in 3 directions are E-x-k, E-y-k and E-z-k respectively;
s26, traversing all the possibilities of the components of the controllable microwave source in the temperature control area on the corresponding time step, and coupling with the components of other temperature control areas to obtain an optimal electric field intensity component set E-x, E-y and E-z which can enable all grid units in Col1 and Col2 to meet the judgment rule, wherein the total power of the current temperature control area corresponding to the set is Pj, and correspondingly adjusting the microwave power of the controllable microwave source of the temperature control area.
2. The biomass microwave pyrolysis process temperature control method according to claim 1, further comprising:
and if not, generating the temperature control instruction of the microwave reactor according to the current microwave power.
3. The method for controlling the temperature of a biomass microwave pyrolysis process according to claim 1, wherein the preset number comprises:
3 to 40.
4. The method for controlling the temperature of a biomass microwave pyrolysis process according to claim 1, wherein the dividing the inner cavity of the microwave reactor into a preset number of temperature control areas comprises:
the inner cavity of the microwave reactor is divided into a preset number of temperature control areas with equal length, or the inner cavity of the microwave reactor is divided into a preset number of temperature control areas with the same temperature difference according to a temperature rising curve.
5. The method of any one of claims 1 to 4, wherein the gridding the three-dimensional electromagnetic field model comprises:
the grid is a tetrahedral grid or a hexahedral grid.
6. A biomass microwave pyrolysis process temperature control device for implementing the biomass microwave pyrolysis process temperature control method according to any one of claims 1 to 5, comprising:
the modeling unit is used for modeling according to the continuously fed microwave reactor, generating a three-dimensional electromagnetic field model of the microwave reactor and gridding the three-dimensional electromagnetic field model;
the partition unit is used for dividing the inner cavity of the microwave reactor into temperature control areas with preset numbers according to the three-dimensional electromagnetic field model, and respectively setting target temperature intervals of the temperature control areas;
a parameter acquisition unit, configured to acquire input parameters of the three-dimensional electromagnetic field model, including: the initial microwave power of each controllable microwave source in the microwave reactor, and the physical property parameters and the material feeding rate of the biomass;
the prediction unit is used for calculating and obtaining a simulation result of the three-dimensional electromagnetic field model according to the input parameters by taking a preset time step as a calculation period; the simulation result comprises a temperature predicted value of each temperature control area after a time step;
and the calculation unit is used for respectively judging whether each temperature control area comprises grids exceeding the target temperature interval according to the temperature predicted value of each temperature control area, if so, adjusting the microwave power of the controllable microwave source exceeding the grids of the target temperature interval according to a preset rule, and taking the adjusted microwave power of the controllable microwave source as the current microwave power.
7. The biomass microwave pyrolysis process temperature control device of claim 6, further comprising:
and the instruction generation unit is used for generating the temperature control instruction of the microwave reactor according to the current microwave power when each temperature control area does not exceed the grid of the target temperature interval.
8. A memory comprising a software program adapted to be executed by a processor for performing the steps of the biomass microwave pyrolysis process temperature control method according to any one of claims 1 to 5.
9. A temperature control device for biomass microwave pyrolysis process, which is characterized by comprising a bus, a processor and a memory as in claim 8;
the bus is used for connecting the memory and the processor;
the processor is configured to execute the set of instructions in the memory.
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