CN115521800A - Biomass microwave pyrolysis process speed-up method, device, equipment and storage medium - Google Patents
Biomass microwave pyrolysis process speed-up method, device, equipment and storage medium Download PDFInfo
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- 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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- 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 method, a device, equipment and a storage medium for accelerating a biomass microwave pyrolysis process, wherein the method comprises the following steps: modeling according to a continuous feeding microwave reactor, generating a three-dimensional electromagnetic field model and gridding; 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; acquiring input parameters of a three-dimensional electromagnetic field model; calculating according to the input parameters to obtain a simulation result of the three-dimensional electromagnetic field model; respectively judging whether each temperature control area comprises grids exceeding a target temperature interval, if so, adjusting the microwave power of a controllable microwave source of the grids exceeding the target temperature interval, and taking the adjusted microwave power of the controllable microwave source as the current microwave power; if not, the material feeding speed is updated in an up-regulation mode; and generating a feeding rate instruction according to the updated material feeding rate. The present invention can increase the efficiency of a microwave reactor by increasing the feed rate.
Description
Technical Field
The invention relates to the field of chemical processes, in particular to a method, a device, equipment and a storage medium for accelerating a biomass microwave pyrolysis process.
Background
Pyrolysis of biomass, which is generally a process in which biomass is heated to raise its temperature in an oxygen-free or low-oxygen environment to cause molecular decomposition to produce coke, condensable liquids, and gaseous products, is an important form of utilization of biomass energy.
In the process of biomass fast pyrolysis, a biomass raw material is rapidly heated to a higher reaction temperature under the condition of oxygen deficiency, so that 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 of biomass fast pyrolysis, and compared with other pyrolysis modes, the microwave heating has the characteristics of high heating rate, short retention time, proper pyrolysis temperature and the like, and therefore, the microwave heating has research and development prospects in the field of chemical application.
The inventor finds that the prior art has at least the following defects through research:
because microwave heating has the characteristics of high heating rate and short retention time, a large constant temperature area is usually established at the tail end of the process to stabilize the discharging temperature, but the large constant temperature area invisibly compresses the pyrolysis space in the reactor, and reduces the treatment efficiency of the reactor with the same specification and size.
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 skilled in the art.
Disclosure of Invention
The invention aims to control temperature and improve the processing capacity of the microwave reactor by improving the material feeding rate.
The invention provides a biomass microwave pyrolysis process speed-up method, which comprises the following steps:
s11, modeling according to a continuous feeding microwave reactor, generating a three-dimensional electromagnetic field model of the microwave reactor and gridding the three-dimensional electromagnetic field model;
s12, 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;
s13, acquiring input parameters of the three-dimensional electromagnetic field model, including: initial microwave power of each controllable microwave source in the microwave reactor, and physical 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 predicted temperature value of each temperature control area after a time step;
s15, 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 a controllable microwave source of the grids exceeding 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; if not, the material feeding rate is adjusted up and updated, and the step S14 is returned;
and S16, generating a feeding rate instruction of the microwave reactor according to the updated material feeding rate.
Preferably, in the present invention, the method further comprises:
s17, when the current material feeding rate is lower, the temperature control area still comprises grids exceeding the target temperature range through a preset number of calculation cycles, and the material feeding rate is adjusted to be lower than the value before the last updating.
Preferably, in the present invention, the preset number includes:
3 to 40.
Preferably, in the present invention, the dividing the inner cavity of the microwave reactor into a preset number of temperature control regions includes:
the inner cavity of the microwave reactor is divided into equal-length temperature control areas with preset number, or the inner cavity of the microwave reactor is divided into equal-temperature control areas with preset number according to a temperature rise curve.
Preferably, in the present invention, the generating a three-dimensional electromagnetic field model of the microwave reactor according to microwave reactor modeling and gridding the three-dimensional electromagnetic field model includes:
setting the volume in the cavity 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 Total power of the microwave reactor is
The three-dimensional electromagnetic field model after gridding is provided with D grid units and stored in a set D, wherein the electromagnetic intensity of the ith grid unit belonging to the set D is E i At a temperature of T i ，
Preferably, in the present invention, the determining, according to the predicted temperature value of each temperature control area, whether each temperature control area includes a grid exceeding the target temperature interval, and if yes, adjusting the microwave power of the controllable microwave source of the grid exceeding the target temperature interval according to a preset rule includes:
respectively executing the following steps for each temperature control area:
s21, obtaining the current microwave power of each controllable microwave source when the 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, for the grid unit currently stored in the data set Col1, solving a controllable electric field intensity component range E of the maximum temperature of the biomass in the grid unit in the remaining residence time of the temperature control area in the target temperature interval without exceeding the upper limit of the target temperature interval according to the Maxwell equation of the electric field intensity x-j ，E y-j ，E z-j (ii) a For the grid unit currently stored in the data set Col2, solving a controllable electric field intensity component range E of the minimum temperature of the biomass in the grid unit in the temperature control area in the remaining retention time 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 sets Col1 and Col2 are obtained, decomposing forward waves transmitted by all controllable microwave sources of the temperature control areas through the matrix waveguide, wherein the components of the forward waves in 3 directions are respectively
S26, traversing all possibilities of components of the controllable microwave sources in the temperature control areas on the corresponding time step length, and coupling the possibilities with components of other temperature control areas to obtain an optimal electric field strength component set which can enable all grid cells in Col1 and Col2 to meet the judgment rule
The 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 of the temperature control area.
Preferably, in the present invention, the step of modeling the three-dimensional electromagnetic field includes:
the grids are tetrahedral grids or hexahedral grids.
Preferably, in the present invention, the up-regulation updates the material feeding rate, and the increase of the material feeding rate is a preset percentage of the material feeding rate before the last update, where the preset percentage includes:
0.1 to 5%.
Preferably, in the present invention, the gridding is performed on the three-dimensional electromagnetic field model, and includes a lagrangian grid, in this case:
in step S14:
calculating to obtain the preset time step by analogy with the displacement of a full-grid node according to the material feeding rate; the preset time step is smaller than the maximum time step when the process excites the hot spot effect;
calculating and obtaining a simulation result of the three-dimensional electromagnetic field model according to the input parameters, wherein the simulation result comprises new coordinates of each grid node after displacement after a time step and a temperature predicted value of each temperature control area;
in step S15: the upper limit value and the lower limit value of the standard exceeding amplitude of the temperature predicted value are also preset; the step S15 includes: 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 a controllable microwave source of the grids exceeding the target temperature interval according to a preset rule when the exceeding amplitude exceeds the lower limit value, taking the adjusted microwave power of the controllable microwave source as the current microwave power, and returning to the step S14; and if not, or the exceeding amplitude value exceeds the upper limit value, adjusting up and updating the material feeding rate and returning to the step S14.
In another aspect of the present invention, there is also provided a biomass microwave pyrolysis process speed-increasing device, comprising:
the modeling unit is used for modeling according to a continuous feeding microwave reactor, generating a three-dimensional electromagnetic field model of the microwave reactor and gridding the three-dimensional electromagnetic field model;
the partitioning unit 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 a target temperature interval of each temperature control area;
a parameter obtaining unit for obtaining input parameters of the three-dimensional electromagnetic field model, comprising: initial microwave power of each controllable microwave source in the microwave reactor, and physical 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 predicted temperature value of each temperature control area after a time step;
the computing 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 of the grids exceeding 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; if not, the material feeding rate is adjusted up and updated;
and the instruction generating unit is used for generating the microwave reactor feeding rate instruction according to the updated material feeding rate.
Preferably, in the present invention, the method further comprises:
and the callback unit is used for adjusting the material feeding rate to be lower than the value before the last updating when the temperature control area still comprises grids exceeding the target temperature interval through a preset number of calculation cycles at the current material feeding rate.
On the other side of the embodiment of the invention, the invention also provides a biomass storage microwave pyrolysis process accelerating device, which comprises:
a memory for storing a computer program;
a processor for calling and executing the computer program to realize the steps of the biomass storage microwave pyrolysis process speed-up method.
In another aspect of the embodiments of the present invention, there is also provided a storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method for increasing the speed of a biomass storage microwave pyrolysis process as described in any one of the above.
Compared with the prior art, the invention has the following beneficial effects:
the inventor finds that in the prior art, temperature field needs to be regulated and controlled in the middle and later stages of reaction, otherwise, temperature runaway is easily caused by a hot spot effect. The temperature control is usually carried out by establishing a constant temperature zone to stabilize the temperature field and to adjust the temperature uniformity of the material, but this virtually affects the throughput of the reactor of the same specification.
Based on the cognition, the cavity of the microwave reactor is divided into a plurality of temperature control areas according to the three-dimensional electromagnetic field model, and then temperature value prejudgment is carried out on each temperature control area (namely, the predicted temperature value of each temperature control area after the next time step is calculated); therefore, the microwave power of the controllable microwave source in the grid unit with the temperature not meeting the standard is adjusted through the temperature predicted value of each temperature control area in the next time step, and therefore temperature fluctuation of the biomass in the cavity of the microwave reactor is avoided. Meanwhile, in order to enable the microwave reactor to reach the optimal feeding rate, in the embodiment of the invention, the feeding rate of the microwave reactor can be gradually increased on the premise that all temperature control areas do not exceed the standard, so that the processing capacity and the processing efficiency of the microwave reactor are effectively improved.
According to the invention, because independent calculation is carried out in each temperature control area, the calculation amount can be effectively reduced, the calculation efficiency can be effectively improved, and the generation efficiency of the final control instruction can be further improved, so that the temperature control effect of the microwave reactor can be improved by improving the response time efficiency of the microwave heating biomass microwave pyrolysis process, and the temperature rise process of the biomass in the cavity of the microwave reactor is more stable and controllable.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood and to make the technical means implementable in accordance with the contents of the description, and to make the above and other objects, technical features, and advantages of the present invention more comprehensible, one or more preferred embodiments are described below in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a step diagram of a biomass microwave pyrolysis process upgrading method described in the present invention;
FIG. 2 is a schematic structural diagram of a biomass microwave pyrolysis process speed-up device in the invention;
FIG. 3 is a schematic structural diagram of a speed-increasing control device for the biomass microwave pyrolysis process.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations such as "comprises" or "comprising", etc., will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Spatially relative terms, such as "below," "lower," "upper," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the object in use or operation in addition to the orientation depicted in the figures. For example, if the items in the figures are 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" can encompass both an orientation of below and above. The articles may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.
As used herein, the terms "first," "second," and the like are used to distinguish two different elements or regions, and are not intended to define a particular position or relative relationship. In other words, the terms "first," "second," and the like may also be interchanged with one another in some embodiments.
Example one
In order to increase the processing efficiency of the microwave reactor by increasing the material feeding rate, as shown in fig. 1, in an embodiment of the present invention, there is provided a method for increasing the processing speed of a biomass microwave pyrolysis process, including the steps of:
s11, modeling according to a continuous feeding 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 of gridding the three-dimensional electromagnetic field model may be:
setting the volume in the cavity 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 Total power of the microwave reactor is
The three-dimensional electromagnetic field model after gridding is provided with D grid units and stored in a set D, wherein the electromagnetic intensity of the ith grid unit belonging to the set D is E i At a temperature of 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, the microwave reactor in the embodiment of the present invention is a continuous feeding microwave reactor, and the biomass continuously passes through the cavity of the microwave reactor from the feeding port of the microwave reactor and exits from the discharging port 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 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;
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 values of the number of the temperature control areas can be from 3 to 40. Then, 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 independently calculated, so that the calculated amount can be effectively reduced, the calculation efficiency can be improved, and the temperature control response time efficiency can be further improved.
In the embodiment of the present invention, the specific manner of dividing the temperature control area into a 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 value of each position in the inner cavity of the microwave reactor can be divided into a plurality of temperature control areas with the same temperature difference, for example, the position with the temperature higher than 100 ℃ per liter in the inner cavity of each microwave reactor can be used as the dividing position of one temperature control area.
S13, acquiring 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 are obtained;
before the simulation of the temperature distribution in the cavity of the microwave reactor, various input parameters for generating the three-dimensional electromagnetic field model are needed, which can be the initial microwave power of each controllable microwave source in the microwave reactor, and the physical parameters and material feeding rate of 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 the biomass just enters at the beginning of a calculation cycle (i.e. 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 predicted temperature 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; in practical applications, the value of the time step can be determined according to the actual computing capability of the computer and the experience of those skilled in the art, and is not limited specifically herein.
In the embodiment of the invention, the purpose of obtaining the simulation result of the three-dimensional electromagnetic field model by calculating according to the input parameters is to obtain the predicted temperature value of each temperature control area at the next time step under the current time step, that is, prejudging the predicted temperature value of each temperature control area.
S15, 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 a controllable microwave source of the grids exceeding 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; if not, the material feeding rate is adjusted up and updated, and the step S14 is returned;
in the embodiment of the present invention, it needs to be determined that each temperature control area includes grid cells exceeding the target temperature interval of the temperature control area when the next time step is performed. In practical application, the judgment of whether each temperature control area comprises grid cells exceeding the target temperature interval and the adjustment of the microwave power of the controllable microwave source can be carried out in parallel or one by one.
Preferably, the specific manner of the step may include:
s21, obtaining the current microwave power of each controllable microwave source when the biomass enters a temperature control zone at the current time step according to the three-dimensional electromagnetic field model;
for each temperature control area, at the beginning of a calculation period (namely the current time step), when the biomass just enters, the current microwave power of each controllable microwave source in the temperature control area 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 judge whether the temperature control area comprises grid cells exceeding the upper limit of the target temperature interval and judge which grid cells exceed the upper limit of the target temperature interval, the embodiment of the invention adopts a traversal mode to determine the maximum temperature point of the grid cells in the temperature control area, and when the maximum temperature point exceeds the upper limit of the target temperature interval, the grid cell identification and the temperature data corresponding to the maximum temperature point are stored in a data set Col1, and then the same judgment is carried out on the rest grid cells, so that all the grid cells exceeding the upper limit of the target temperature interval are selected, that is, all the grid cells exceeding the temperature in the next time step (exceeding the upper limit of the target temperature interval) are selected, and are stored in 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 of the biomass does not reach the standard, in the embodiment of the present invention, it is further determined whether the temperature-controlled area includes grid cells that are lower than the lower limit of the target temperature range, and it is determined which grid cells are lower than the lower limit of the target temperature range, the embodiment of the present invention uses a traversal method to determine the minimum temperature point of the grid cells in the temperature-controlled area, and when the minimum temperature point is lower than the lower limit of the target temperature range, the grid cell identifier and the temperature data corresponding to the minimum temperature point are stored in the data set Col2, and then the same determination is performed on the remaining grid cells, so that all the grid cells that include the lower limit of the target temperature range are selected, that is, all the grid cells whose temperature at the next time step does not reach the standard (is lower than the lower limit of the target temperature range) are selected, and are stored in the data set Col 2.
S24, for the grid cell and root currently stored in the data set Col1According to Maxwell equation of electric field intensity, solving a controllable electric field intensity component range E of the maximum temperature of the biomass in the grid unit in the residual residence time of the temperature control area not exceeding the upper limit of the target temperature interval x-j ，E y-j ，E z-j (ii) a For the grid unit currently stored in the data set Col2, solving a controllable electric field intensity component range E of the minimum temperature of the biomass in the grid unit in the temperature control area in the remaining retention time 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 only irradiated by microwaves in the x-axis direction, the electric field intensity components in the other two axis directions are 0, and at this time, the maximum temperature of the grid cell j in the remaining dwell time is equal to the upper limit of the target temperature interval, which is called as E x-j Theoretical maximum value of (E) xj-max (ii) a By the same token, E can be obtained y-j ，E z-j Maximum value of E yj-max ，E zj-max . Then according to E x-j ，E y-j ，E z-j The maximum value and Maxwell equation are combined with the coordinate of the grid unit j in the reaction cavity (namely the cavity of the microwave reactor) to establish E x-j ，E y-j ，E z-j A triangular plane coordinate system (the minimum value of the x-axis of the coordinate system is 0, and the maximum value is E) xj-max And y and z axes are the same), and the coordinate system is the controllable electric field intensity component range of the maximum temperature of the grid unit j in the remaining residence time not exceeding the upper limit of the target temperature interval of the temperature zone.
For a certain grid cell i in the data set Col2, assuming that it is only irradiated by microwaves in the x-axis direction, the electric field intensity components in the other two axes are 0, at this time, the minimum temperature of the grid cell i in the remaining dwell time is equal to the lower limit of the target temperature interval, and the electric field intensity component in the x-axis direction at this time is called E x-i Theoretical minimum value of (E) xj-min (ii) a By the same token, E can be obtained y-i ，E z-i Minimum value E of yj-min ，E zj-min . Then according to E x-i ，E y-i ，E z-i Establishing E by combining the minimum value and Maxwell equation and aiming at the coordinate of the grid unit i in the reaction cavity x-i ，E y-i ，E z-i In a plane triangular 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 provided by the microwave source belonging to the temperature control area under the full power in the x axis, and the y axis and the z axis are the same), and the coordinate system is the controllable electric field intensity component range of the minimum temperature of the grid unit i in the remaining residence time not exceeding 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 sets Col1 and Col2 are obtained, decomposing forward waves transmitted by all controllable microwave sources of the temperature control areas through the matrix waveguide, wherein the components of the forward waves in 3 directions are respectively
S26, traversing all possibilities of components of the controllable microwave sources in the temperature control areas on the corresponding time step length, and coupling the possibilities with components of other temperature control areas to obtain an optimal electric field strength component set which can enable all grid cells in Col1 and Col2 to meet the judgment rule
The 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 of the temperature control area.
Specifically, assuming that the current time step is t, for k controllable microwave sources to which the current temperature control region belongs, the forward wave components in 3 directions are respectively
For the controllable microwave sources which are not in the current temperature control area, if the controllable microwave sources are closer to the discharge hole direction than the current temperature control area, the values of the components of the forward waves in 3 directions are consistent with the values of the components 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 values of the components of the forward wave in 3 directions are consistent with the values of the components of the last time step t-1. In the embodiment of the present invention, it is necessary to traverse all the possibilities of the existence of the components of the controllable microwave sources in the current temperature control region at the current time step t, that is, it is necessary to traverse E related to Col1 x-j ，E y-j ，E z-j E of plane triangular coordinate system related to Col2 x-i ，E y-i ，E z-i All possibilities on the intersection of the plane triangular coordinate systems are superposed with components of forward waves of a non-current temperature control area in 3 directions, and finally an optimal electric field strength component set which can ensure that the maximum temperature of the unit grids in the Col1 in the remaining residence time does not exceed the upper limit of the target temperature area of the temperature control area and simultaneously can ensure that the minimum temperature of the unit grids in the Col2 in the remaining residence time is not lower than the lower limit of the target temperature area is obtained
Aiming at traversing all the possibilities existing in the components of the controllable microwave sources in the current temperature control area on the current time step t
For example, the specific acquisition method is as follows:
setting the number of the affiliated microwave sources in the current temperature control area as Q, and integrating Q controllable electric field intensity component ranges E ＝{E x-1 ，E x-2 ，……，E x-Q From the first element E x-1 Starting traversal, each traversal needs to traverse all elements (which can be for (= 8230)) having intersection with the traversal), record the maximum number of the elements, store the maximum number of the elements into an empty array a = { }, record the intersection interval corresponding to the maximum number of the elements, store the intersection interval into an empty matrix b = { }, and finally compare the maximum number of each traversal result respectively, wherein the maximum number in the array a meets the condition and is correspondingly stored in the empty matrix b = { }The intersection interval in the matrix b is
The value range of (2).
Then, the user can use the device to perform the following steps,
and
obtaining method and
similarly, no further description is provided herein.
The most suitable electric field intensity component set is obtained
The 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 of the current temperature control area.
And S16, generating a feeding rate instruction of the microwave reactor according to the updated material feeding rate.
When each temperature control zone does not exceed the grid of the target temperature zone, a microwave reactor feeding rate instruction can be generated according to the updated material feeding rate. Therefore, the optimal feeding speed which can be achieved by the microwave reactor of the entity can be determined on the premise that each temperature control area does not exceed the standard, the capacity of the microwave reactor can be maximized on the premise that the temperature is controllable, and the processing capacity of the microwave reactor is improved.
In order to avoid the product quality problem of the microwave pyrolysis process of the substance caused by too high feeding rate, in the embodiment of the present invention, the method may further include the steps of:
s17, when the current material feeding rate is lower, the temperature control area still comprises grids exceeding the target temperature range through a preset number of calculation cycles, and the material feeding rate is adjusted to be lower than the value before the last updating.
In summary, according to the embodiment of the present invention, the cavity of the microwave reactor is divided into a plurality of temperature control areas according to the three-dimensional electromagnetic field model, and then the temperature values of the temperature control areas are respectively pre-determined (i.e., the predicted temperature value of each temperature control area after the next time step is calculated); therefore, the microwave power of the controllable microwave source in the grid unit with the temperature not meeting the standard is adjusted through the temperature predicted value of each temperature control area in the next time step, and therefore temperature fluctuation of the biomass in the cavity of the microwave reactor is avoided. Meanwhile, in order to ensure that the microwave reactor can achieve the optimal feeding rate, in the embodiment of the invention, the feeding rate of the microwave reactor can be gradually increased on the premise that all temperature control areas do not exceed the standard, so that the processing capacity and the processing efficiency of the microwave reactor are effectively improved.
According to the invention, because independent calculation is carried out in each temperature control area, the calculation amount can be effectively reduced, the calculation efficiency can be effectively improved, and the generation efficiency of the final control instruction can be further improved, so that the temperature control effect of the microwave reactor can be improved by improving the response time efficiency of the microwave heating biomass microwave pyrolysis process, and the temperature rise process of the biomass in the cavity of the microwave reactor is more stable and controllable.
Example two
Further, in the embodiment of the present invention, an optimization scheme in a lagrangian grid scene is further disclosed when the three-dimensional electromagnetic field model is gridded, specifically:
when the Lagrange grid mode is adopted for gridding:
step S14 in the first embodiment needs to be adjusted or limited accordingly, specifically:
the determination mode of the preset time step specifically comprises the following steps: calculating to obtain the preset time step by analogy with the displacement of a full-grid node according to the material feeding rate; the preset time step is smaller than the maximum time step when the hot spot effect is excited by the process;
the simulation result of the three-dimensional electromagnetic field model obtained by calculation according to the input parameters comprises new coordinates after displacement of each grid node after a time step and temperature predicted values of each temperature control area;
next, step S15 in the first embodiment needs to be adjusted or limited correspondingly, which specifically includes:
in step S15: the upper limit value and the lower limit value of the standard exceeding amplitude of the temperature predicted value are also preset; the step S15 includes: 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 a controllable microwave source of the grids exceeding the target temperature interval according to a preset rule when the exceeding amplitude exceeds the lower limit value, taking the adjusted microwave power of the controllable microwave source as the current microwave power, and returning to the step S14; if not, or the exceeding amplitude value exceeds the upper limit value, the material feeding rate is adjusted upwards and updated, and the step S14 is returned.
EXAMPLE III
On the other side of the embodiment of the present invention, a stored biomass microwave pyrolysis process speed-increasing device is further provided, fig. 2 shows a schematic structural diagram of the stored biomass microwave pyrolysis process speed-increasing device provided in the embodiment of the present invention, the stored biomass microwave pyrolysis process speed-increasing device is a device corresponding to the stored biomass microwave pyrolysis process speed-increasing method in the embodiment corresponding to fig. 1, that is, the stored biomass microwave pyrolysis process speed-increasing method in the embodiment corresponding to fig. 1 is implemented by using a virtual device, and each virtual module constituting the stored biomass microwave pyrolysis process speed-increasing device may be implemented by an electronic device, such as a network device, a terminal device, or a server. The device for accelerating the microwave pyrolysis process of the stored biomass can realize the acceleration of the microwave pyrolysis process of the stored biomass required by industrial control. Specifically, the speed increasing device for the biomass storage microwave pyrolysis process in the embodiment of the invention comprises:
the modeling unit 01 is used for modeling according to a continuous feeding 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 a target temperature interval of each temperature control area;
a parameter obtaining unit 03, configured to obtain input parameters of the three-dimensional electromagnetic field model, including: initial microwave power of each controllable microwave source in the microwave reactor, and physical 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 predicted temperature value of each temperature control area after a time step;
the calculating unit 05 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 of the grids exceeding 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; if not, the material feeding rate is adjusted up and updated;
and the instruction generating unit 06 is configured to generate the microwave reactor feeding rate instruction according to the updated material feeding rate.
Preferably, in the embodiment of the present invention, the method may further include:
and a callback unit (not shown in the figure), configured to, when the temperature control area still includes grids exceeding the target temperature interval for a preset number of calculation cycles at the current material feeding rate, decrease the material feeding rate to a value before the last update.
Since the working principle and the beneficial effects of the biomass microwave pyrolysis process speed-increasing device in the embodiment of the invention have been recorded and described in the biomass microwave pyrolysis process speed-increasing method corresponding to fig. 1, they can be referred to each other and are not described herein again.
Example four
Corresponding to the method embodiment, the application also provides a device for accelerating the microwave pyrolysis process of the stored biomass, such as a terminal, a server and the like. The server can be an independent physical server, a server cluster or a distributed system formed by a plurality of physical servers, and can also be a cloud server for providing basic cloud computing services such as cloud service, a cloud database, cloud computing, cloud functions, cloud storage, network service, cloud communication, middleware service, domain name service, security service, CDN (content delivery network), big data and artificial intelligence platforms and the like. The terminal may be, but is not limited to, a smart phone, a tablet computer, a notebook computer, a desktop computer, etc.
An exemplary diagram of a hardware structure block diagram of the biomass storage microwave pyrolysis process accelerating device provided by the embodiment of the present invention is shown in fig. 3, and may include:
a processor 1, a communication interface 2, a memory 3 and a communication bus 4;
wherein, the processor 1, the communication interface 2 and the memory 3 complete the communication with each other through the communication bus 4;
optionally, the communication interface 2 may be an interface of a communication module, such as an interface of a GSM module;
the processor 1 may be a central processing unit CPU or an Application Specific Integrated Circuit ASIC or one or more Integrated circuits configured to implement embodiments of the present invention.
The memory 3 may comprise high-speed RAM memory and may also comprise non-volatile memory, such as at least one disk memory.
The processor 1 is specifically configured to execute the computer program stored in the memory 3 to execute 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 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;
s13, acquiring input parameters of the three-dimensional electromagnetic field model, including: initial microwave power of each controllable microwave source in the microwave reactor, and physical 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 predicted temperature value of each temperature control area after a time step;
s15, 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 a controllable microwave source of the grids exceeding 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; if not, the material feeding rate is adjusted up and updated, and the step S14 is returned;
and S16, generating a feeding rate instruction of the microwave reactor according to the updated material feeding rate.
Preferably, in the embodiment of the present invention, the method may further include:
s17, when the temperature control area still comprises grids exceeding the target temperature interval through a preset number of calculation cycles at the current material feeding rate, the material feeding rate is adjusted downward to the value before the last updating.
In the device for accelerating the microwave pyrolysis process of the stored biomass, the computer program product comprises program instructions which, when executed by the computer, can cause the computer to execute the method for accelerating the microwave pyrolysis process of the stored biomass in the above aspects, and achieve the same technical effects.
EXAMPLE five
In an embodiment of the present invention, there is also provided a storage medium storing a program adapted to be executed by a processor, the program being configured to:
s11, modeling according to a continuous feeding microwave reactor, generating a three-dimensional electromagnetic field model of the microwave reactor and gridding the three-dimensional electromagnetic field model;
s12, 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;
s13, acquiring input parameters of the three-dimensional electromagnetic field model, including: initial microwave power of each controllable microwave source in the microwave reactor, and physical 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 predicted temperature value of each temperature control area after a time step;
s15, 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 a controllable microwave source of the grids exceeding 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; if not, the material feeding rate is adjusted up and updated, and the step S14 is returned;
and S16, generating a feeding rate instruction of the microwave reactor according to the updated material feeding rate.
Preferably, in the embodiment of the present invention, the method may further include:
s17, when the temperature control area still comprises grids exceeding the target temperature interval through a preset number of calculation cycles at the current material feeding rate, the material feeding rate is adjusted downward to the value before the last updating.
Alternatively, the detailed function and the extended function of the program may be as described above.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to methods provided by other embodiments of the present invention.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
It should be understood that in the embodiments of the present application, the technical problems described above can be solved by combining and combining the features of the embodiments and the embodiments.
The functions may be stored in a computer-readable storage medium if they are implemented in the form of software functional units and sold or used as separate products. Based on such understanding, the technical solutions of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. A biomass microwave pyrolysis process speed-up method is characterized by comprising the following steps:
s11, modeling according to a continuous feeding microwave reactor, generating a three-dimensional electromagnetic field model of the microwave reactor and gridding the three-dimensional electromagnetic field model;
s12, 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;
s13, acquiring input parameters of the three-dimensional electromagnetic field model, including: initial microwave power of each controllable microwave source in the microwave reactor, and physical 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 predicted temperature value of each temperature control area after a time step;
s15, 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 a controllable microwave source of the grids exceeding 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; if not, the material feeding rate is adjusted up and updated, and the step S14 is returned;
and S16, generating a feeding rate instruction of the microwave reactor according to the updated material feeding rate.
2. The biomass microwave pyrolysis process acceleration method of claim 1, characterized by further comprising:
s17, when the current material feeding rate is lower, the temperature control area still comprises grids exceeding the target temperature range through a preset number of calculation cycles, and the material feeding rate is adjusted to be lower than the value before the last updating.
3. The method for accelerating the biomass microwave pyrolysis process according to claim 1, wherein the preset number comprises:
3 to 40.
4. The method for accelerating the microwave pyrolysis process of the biomass according to claim 1, wherein the step of dividing the inner cavity of the microwave reactor into a preset number of temperature control areas comprises the steps of:
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 rise curve.
5. The biomass microwave pyrolysis process acceleration method of claim 1, wherein the generating and gridding the three-dimensional electromagnetic field model of the microwave reactor according to microwave reactor modeling comprises:
setting the volume in the cavity 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 Total power of the microwave reactor is
The three-dimensional electromagnetic field model after gridding is provided with D grid units and stored in a set D, wherein the electromagnetic intensity of the ith grid unit belonging to the set D is E i At a temperature of T i 。
6. The method for accelerating the microwave pyrolysis process of the biomass according to claim 1, wherein the step of respectively judging whether each temperature control area comprises grids exceeding the target temperature interval according to the predicted temperature value of each temperature control area, and if yes, the step of adjusting the microwave power of a controllable microwave source of the grids exceeding the target temperature interval according to a preset rule comprises the following steps:
respectively executing the following steps for each temperature control area:
s21, obtaining the current microwave power of each controllable microwave source when the 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 if the minimum temperature point exceeds the lower limit of the target temperature range, storing the grid cell identification and the temperature data corresponding to the minimum temperature point into a data set Col 2;
s24, for the grid cells currently stored in the data set Col1, according toSolving the maxwell equation of the electric field intensity, and solving the controllable electric field intensity component range E of the maximum temperature of the biomass in the grid unit in the residual residence time of the temperature control area not exceeding the upper limit of the target temperature range x-j ，E y-j ，E z-j (ii) a For the grid unit currently stored in the data set Col2, solving a controllable electric field intensity component range E of the minimum temperature of the biomass in the grid unit in the remaining residence time of the temperature control area not lower than the lower limit of the target temperature range according to Maxwell equation of the electric field intensity x-i ，E y-i ，E z-i ；
S25, after obtaining the controllable electric field intensity component ranges of all grid units in the sets Col1 and Col2, decomposing forward waves transmitted by all controllable microwave sources of the temperature control areas through the matrix waveguide, wherein the components of the forward waves in 3 directions are respectively
S26, traversing all possibilities of components of the controllable microwave sources in the temperature control areas on the corresponding time step length, and coupling the possibilities with components of other temperature control areas to obtain an optimal electric field strength component set which can enable all grid cells in Col1 and Col2 to meet the judgment rule
The 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 of the temperature control area.
7. The method for accelerating the biomass microwave pyrolysis process according to any one of claims 1 to 6, wherein the step of modeling the three-dimensional electromagnetic field comprises the following steps:
the meshes are tetrahedral meshes or hexahedral meshes.
8. The method for accelerating the microwave pyrolysis process of biomass according to any one of claims 1 to 6, wherein the up-regulation updates the material feed rate by a preset percentage of the feed rate before the last update, the preset percentage comprising:
0.1 to 5 percent.
9. The biomass microwave pyrolysis process acceleration method of any one of claims 1 to 6, wherein the three-dimensional electromagnetic field model is gridded, which comprises a Lagrangian grid, and comprises:
in step S14:
calculating to obtain the preset time step by analogy with the displacement of a full-grid node according to the material feeding rate; the preset time step is smaller than the maximum time step when the process excites the hot spot effect;
calculating and obtaining a simulation result of the three-dimensional electromagnetic field model according to the input parameters, wherein the simulation result comprises new coordinates of each grid node after displacement after a time step and a temperature predicted value of each temperature control area;
in step S15: the upper limit value and the lower limit value of the standard exceeding amplitude of the temperature predicted value are also preset; the step S15 includes: 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 a controllable microwave source of the grids exceeding the target temperature interval according to a preset rule when the exceeding amplitude exceeds the lower limit value, taking the adjusted microwave power of the controllable microwave source as the current microwave power, and returning to the step S14; and if not, or the exceeding amplitude value exceeds the upper limit value, adjusting up and updating the material feeding rate and returning to the step S14.
10. A biomass microwave pyrolysis process accelerating device is characterized by comprising:
the modeling unit is used for modeling according to a continuous feeding microwave reactor, generating a three-dimensional electromagnetic field model of the microwave reactor and gridding the three-dimensional electromagnetic field model;
the partitioning unit 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 a target temperature interval of each temperature control area;
a parameter obtaining unit for obtaining input parameters of the three-dimensional electromagnetic field model, comprising: initial microwave power of each controllable microwave source in the microwave reactor, and physical 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 predicted temperature value of each temperature control area after a time step;
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 a controllable microwave source of the grids exceeding 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; if not, the material feeding rate is adjusted up and updated;
and the instruction generating unit is used for generating the microwave reactor feeding rate instruction according to the updated material feeding rate.
11. The biomass microwave pyrolysis process acceleration device of claim 10, characterized by further comprising:
and the call-back unit is used for adjusting the material feeding rate to a value before last updating under the condition that the temperature control area still comprises grids exceeding the target temperature range through a preset number of calculation cycles at the current material feeding rate.
12. A device for accelerating the microwave pyrolysis process of stored biomass comprises:
a memory for storing a computer program;
a processor for invoking and executing the computer program to implement the steps of the biomass microwave pyrolysis process acceleration method of any one of claims 1-9.
13. A storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the method for accelerating a microwave pyrolysis process of biomass as claimed in any one of claims 1 to 9.
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