Biomass particle distribution test device and torque force model verification method

Abstract

The invention discloses a biomass particle distribution testing device and a torque force model verification method, and belongs to the technical field of biomass fuel application. The biomass particle distribution testing device comprises a shell, a biomass particle feeding assembly and a gas phase flow field control assembly; the physical distribution test of the biomass particles under different test conditions is realized, and the drop point distribution of the biomass particles under different test conditions is accurately represented; meanwhile, a simulation model is constructed for the distribution test device, a torque force model to be verified is imported into the simulation model, and equivalent design of physical test conditions and simulation test conditions is carried out, so that conditions are provided for obtaining a distribution result simulation value of biomass particles in the simulation model; by comparing the actual measurement value and the simulation value of the distribution result, indirect verification of the to-be-verified torque force model is rapidly and accurately completed, the tedious process in a conventional model verification method is effectively avoided, and the efficiency and accuracy of torque force model verification are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of biomass fuel application, and particularly relates to a distribution test device for biomass particles and a method for verifying a torque force model. Background Art

[0002] In the process of achieving the "dual carbon" goal, combining coal-fired power units with direct combustion power generation of biomass is a feasible way to effectively utilize low-carbon-emission biomass energy. However, for the application of biomass fuels, there is currently a lack of mature application standards, and conventional kinetic models for spherical particles are also difficult to directly apply to the simulation and verification of "non-spherical" biomass fuel particles, making the combustion application of biomass particles face various challenges such as fuel fragmentation and transportation, combustion process control, and boiler heating surface corrosion.

[0003] To address the above challenges, researchers have proposed a variety of gas-solid two-phase kinetic models for non-spherical particles in combination with the characteristics of biomass fuel particles, aiming to use the above models to simulate the movement trajectories and combustion processes of biomass particles, and then optimize the energy utilization efficiency of biomass particles and enhance the engineering application ability of biomass fuels.

[0004] However, although a large number of scholars have proposed various torque force models for biomass particles, the accuracy and effectiveness of the above models are difficult to be accurately verified, which leads to a lack of reliable support for the application of various models. Even though some verification methods have been proposed for the verification of the above models in the prior art, for example, a torque force test device for biomass particles is set up, a high-speed camera is used to capture the movement trajectory and operating parameters of a single particle in the air flow, and then the torque force during particle movement is calculated accordingly; by comparing the experimental calculation results with the simulation results of the kinetic model, the accuracy of the kinetic model is judged. Although the above method can evaluate the accuracy of the existing torque force model to a certain extent, the verification process in the above method is complex, the application cost of the high-speed camera is too high, and a relatively complex calculation program needs to be developed to complete the data verification process. Therefore, the above method cannot be fully applied to the verification process of the existing biomass particle torque force model, has great limitations, and restricts the popularization and application of biomass particles. Summary of the Invention

[0005] In view of one or more of the above defects or improvement requirements of the prior art, the present invention provides a distribution test device for biomass particles and a method for verifying a torque force model, which can accurately complete the distribution test of biomass particles under different kinetic parameter conditions, and accurately complete the verification of the torque force model and judge the accuracy and reliability of the existing torque force model based on the progress of the distribution test and the design of the verification method.

[0006] To achieve the above object, in one aspect of the present invention, there is provided a distribution testing device for biomass particles, which includes a housing having an internal testing cavity, a gas-phase flow field control assembly and a biomass particle feeding assembly arranged corresponding to the housing; A plurality of fan-shaped collection grooves are circumferentially separated at the bottom of the housing for collecting biomass particles under different movement trajectories in a partitioned manner; The gas-phase flow field control assembly includes an air pump, a bypass pipe, a connecting pipe and a gas transmission pipeline; both ends of the connecting pipe are respectively communicated with the air outlet of the air pump and one end of the gas transmission pipeline; the other end of the gas transmission pipeline extends into the top of the housing for providing power for the movement of biomass particles and forming a specific gas-phase environment in the internal testing cavity; the bypass pipe is connected to the connecting pipe for assisting in adjusting the gas flow rate in the gas transmission pipeline; and a flow valve is arranged on the gas transmission pipeline for monitoring the gas flow rate and temperature in the gas transmission pipeline; The biomass particle feeding assembly is arranged at the top of the housing, and its discharge port extends into the housing and faces the reflux area at the outlet of the gas transmission pipeline for inputting biomass particles into the housing.

[0007] As a further improvement of the present invention, it further includes a computer, which respectively performs data interaction with the flow valve and the biomass particle feeding assembly through electronic components, for receiving gas parameters detected by the flow valve and controlling the biomass particle feeding assembly to feed biomass particles into the housing at a specific feeding speed.

[0008] As a further improvement of the present invention, the biomass particle feeding assembly includes a feeder, and the feeder has a funnel and a conveyor belt; The funnel is arranged above the conveyor belt for loading biomass particles; the conveyor belt is arranged corresponding to the discharge port of the funnel, and is electrically connected to the computer, and can be started and stopped under the control of the computer and control the input rate of biomass particles into the housing.

[0009] As a further improvement of the present invention, the housing is a conical housing, and the inner diameter of its top is larger than the inner diameter of its bottom; and / or The axis of the discharge port of the biomass particle feeding assembly is orthogonally arranged with the axis at the outlet of the gas transmission pipeline.

[0010] As a further improvement of the present invention, the fan-shaped collection grooves are separated by a plurality of partition plates, and the thickness of each partition plate is 0.01 m to 0.03 m, and the height is 0.2 m to 0.5 m.

[0011] Another aspect of the present invention provides a method for verifying a torque force model of biomass particles, which is completed by using the distribution testing device for biomass particles, and includes the following processes: (1) Construct a simulation model of the device according to the physical object of the distribution testing device; (2) Import the torque force model to be verified into the simulation model; (3) Set the test conditions of the distribution testing device, conduct a physical distribution test of biomass particles, and obtain the measured values of the distribution results of biomass particles in the fan-shaped collection tank at the bottom of the housing under the corresponding test conditions; (4) Set the same simulation test conditions in the simulation model for each group of test conditions in (3), and run the simulation model to obtain the simulation values of the distribution results of biomass particles under each group of simulation test conditions; (5) Compare the measured values of each distribution result with the simulation values of the distribution results under the same test conditions, determine the error between the two distribution results, and evaluate the accuracy of the torque force model to be verified based on this.

[0012] As a further improvement of the present invention, in process (3), the physical distribution test of biomass particles includes at least the following four situations: (3.1) Control the gas flow rate introduced into the housing through the gas pipeline to be constant with other temperatures, and keep the parameters of the biomass particles constant. After the set test time, count the distribution results of the biomass particles in the fan-shaped collection tank; (3.2) Keep the gas flow rate introduced into the housing by the gas pipeline constant, and keep the shape of the biomass particles unchanged. Adjust the air temperature, and count the distribution results of the biomass particles in the fan-shaped collection tank after the set test time; (3.3) Keep the gas flow rate and air temperature introduced into the housing by the gas pipeline constant, change the parameters of the biomass particles, and count the distribution results of the biomass particles in the fan-shaped collection tank after the set test time; (3.4) Keep the air temperature of the gas introduced into the housing by the gas pipeline unchanged, and keep the parameters of the biomass particles unchanged. Adjust the gas flow rate, and count the distribution results of the biomass particles in the fan-shaped collection tank after the set test time.

[0013] As a further improvement of the present invention, when conducting each group of tests in (3.2) to (3.4), there are multiple parameters to choose from for the variables in each group of test processes.

[0014] As a further improvement of the present invention, when conducting each group of tests in (3.2) and (3.4), the variables in each group of test processes change continuously.

[0015] As a further improvement of the present invention, for each group of tests in (3.1) to (3.4), multiple identical test operations are performed, and the average value of the multiple test results is used as the final result under such test conditions.

[0016] The above improved technical features can be combined with each other as long as they do not conflict with each other.

[0017] Generally speaking, compared with the prior art, the beneficial effects of the above technical solutions conceived by the present invention include: (1) The biomass particle distribution test device of the present invention includes a housing and a biomass particle feeding assembly and a gas-phase flow field control assembly corresponding to the housing. By using the combined setting of the air pump, bypass pipe, connecting pipe and gas transmission pipeline in the gas-phase flow field control assembly, the corresponding setting of the biomass particle feeding assembly and the gas transmission pipeline, and the corresponding setting of multiple fan-shaped collection grooves at the bottom of the housing, the biomass particles can complete the distribution test under the corresponding test conditions, and accurately characterize the biomass particle distribution state under different test conditions.

[0018] (2) The verification method of the biomass particle torque force model of the present invention, by constructing a simulation model for the distribution test device, then importing the torque force model to be verified into the simulation model, and the equivalent design of the physical test conditions and the simulation test conditions, ensures that the measured value of the distribution result and the simulation value of the distribution result can maintain the same test conditions, and provides a basis for the comparison of the two distribution results. Through the comparison of the measured value and the simulation value of the distribution result, the indirect verification of the torque force model to be verified is quickly and accurately completed, effectively avoiding the cumbersome process in the conventional model verification method, and improving the efficiency and accuracy of the torque force model verification. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 is a schematic structural diagram of the biomass particle distribution test device in the embodiment of the present invention; Figure 2 is a schematic diagram of the fan-shaped collection groove structure of the biomass particle distribution test device in the embodiment of the present invention; Figure 3 is a control process flow chart for verifying the torque force model by using the distribution test device in the embodiment of the present invention; In all the drawings, the same reference numerals represent the same technical features, specifically: 1. Air pump; 2. Bypass pipe; 3. Connecting pipe; 4. Gas transmission pipeline; 5. Flow valve; 6. Computer; 7. Sector collecting trough; 8. Housing; 9. Top cover; 10. Feeder. Detailed implementation manners

[0021] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] In the description of the present invention, it should be understood that unless otherwise clearly specified and defined, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0023] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0024] In the present invention, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0026] Embodiment: Please refer to Figures 1 to 2 , the distribution test device in the preferred embodiment of the present invention is used to conduct the distribution test of biomass particles under different pneumatic conditions, aiming to characterize the trajectory differences of biomass particles when moving in the gas-solid two-phase flow due to the action of torque force, and finally obtain the distribution of biomass particles in different regions at the bottom of the test container. By using the obtained distribution results as the basis for verifying the torque force model, the verification of the torque force model of biomass particles is finally completed.

[0027] Specifically, the distribution test device in the preferred embodiment includes a housing 8 with an internal test cavity, and a gas-phase flow field control component and a biomass particle feeding component are provided corresponding to the housing 8. Among them, the gas-phase flow field control component is arranged on one side of the top of the housing 8 and is used to form a gas-phase test environment under specific parameter conditions in the housing 8 to provide power for the movement of biomass particles. The biomass particle feeding component is communicated with the top of the housing 8 and is used to continuously input the biomass particles to be tested into the housing 8.

[0028] In actual setting, a plurality of sector-shaped collection grooves 7 are circumferentially separated at the bottom of the housing 8 in the preferred embodiment, which are formed by arranging a plurality of partitions at the bottom of the housing 8 and are used to collect the biomass particles moving to different regions to characterize the distribution of the biomass particles.

[0029] Exemplarily, in the preferred embodiment shown in Figure 2 , there are 12 sector-shaped collection grooves 7 arranged at equal intervals in the circumferential direction, which are respectively numbered and marked as A~L shown in Figure 2 . By collecting the quantity or mass of the biomass particles in each sector-shaped collection groove 7, the distribution of the biomass particles in the distribution test device under specific test conditions is characterized.

[0030] Of course, it can be understood that according to the actual application needs, the number of the sector-shaped collection grooves 7 can be increased or decreased correspondingly, which will not be elaborated here.

[0031] In more detail, the bottom cross-sectional area of ​​the shell 8 in the preferred embodiment is circular, and the partition used to separate the fan-shaped collecting trough 7 is preferably made of transparent material; more preferably, the thickness of the partition is preferably 0.01m~0.03m, and the height is preferably 0.2m~0.5m; for example, the thickness is 0.015m and the height is 0.3m.

[0032] Furthermore, the housing 8 in the preferred embodiment is a conical housing, the inner diameter of the top of which is larger than the inner diameter of the bottom, such as Figure 1 as shown in .

[0033] In actual configuration, it is preferred that both the top and the bottom of the housing 8 are provided with cylindrical structures, and a conical structure is provided between the two cylindrical structures.

[0034] In more detail, the gas phase flow field control assembly in the preferred embodiment is arranged on one side of the housing 8, and includes an air pump 1, a bypass pipe 2, a connecting pipe 3 and a gas pipeline 4. The two ends of the connecting pipe 3 are respectively sealedly connected to the gas outlet of the air pump 1 and one end of the gas pipeline 4, and the other end of the gas pipeline 4 extends into the top of the housing 8, so as to form a gas phase environment with specific conditions in the housing 8.

[0035] In a preferred embodiment, the air pump 1 can adjust the wind speed and wind temperature of the input gas, which can not only provide power for the movement of the biomass particles, but also change the test conditions of the biomass particles as needed to characterize the distribution state of the biomass particles under different test conditions.

[0036] Accordingly, the bypass pipe 2 is connected to the connecting pipe 3 to assist in adjusting the gas flow rate in the gas pipeline 4. At the same time, a flow valve 5 is also provided on the gas pipeline 4 to monitor the gas flow rate and temperature in the gas pipeline 4.

[0037] In addition, a computer 6 electrically connected to the flow valve 5 is included, which is used to receive the gas parameters detected by the flow valve 5. The computer 6 is electrically connected to the biomass particle feeding assembly, which is used to control the biomass particle feeding assembly to feed the biomass particles into the housing 8 at a specific feeding speed.

[0038] Furthermore, the top of the shell 8 is sealed by a top cover 9, and a biomass particle feeding assembly is arranged on the top cover 9, with its discharge port extending into the shell and facing the reflux zone at the outlet of the gas pipeline 4, so that biomass particles can be continuously fed into the shell 8.

[0039] Specifically, the biomass pellet feeding assembly in the preferred embodiment is a feeder 10 provided on the top cover 9, and its discharge port passes through the top cover 9 and extends into the housing 8. In actual setting, the feeder 10 preferably includes a funnel and a conveyor belt. Among them, the funnel is arranged above the conveyor belt for filling biomass pellets, and the conveyor belt is arranged corresponding to the discharge port of the funnel. Its control mechanism is electrically connected to the computer 6, and it can start and stop according to the control of the computer 6 and control the transmission speed of the biomass pellets on the conveyor belt, that is, control the input rate of the biomass pellets into the housing 8.

[0040] At the same time, the discharge port of the feeder 10 is arranged facing the recirculation zone at the outlet of the gas transmission pipeline 4, so that the fed biomass pellets can be accurately fed into the recirculation zone at the outlet of the gas transmission pipeline 4.

[0041] Exemplarily, the axis at the outlet of the gas transmission pipeline 4 in the preferred embodiment is orthogonally arranged with the axis at the discharge port of the feeder 10, that is, the biomass pellets to be tested can enter the gas-phase flow field in a manner perpendicular to the gas input direction. Such a setting can maximize the interaction range between the biomass pellets and the airflow, make the mixing between the solid phase and the gas phase more sufficient, and ensure the uniform distribution of the biomass pellets in the gas-solid two-phase flow. In addition, in actual setting, a number of ventilation holes are preferably provided for the housing 8 to maintain the air pressure balance inside and outside the housing 8. In the preferred embodiment, the above ventilation holes are preferably provided on the top cover 9.

[0042] More preferably, the gas transmission pipeline 4 and the top cover 9 are preferably made of transparent materials, which is convenient for operators to directly observe the internal conditions of the gas transmission pipeline 4 and the housing 8.

[0043] In addition, in the preferred embodiment, heat preservation designs are preferably carried out for the connecting pipe 3 and the gas transmission pipeline 4, such as being prepared with materials having strong heat insulation ability, or providing heat insulation units or heat preservation units, so as to fully ensure that the gas-phase flow field formed at the outlet of the gas transmission pipeline 4 meets the preset parameter conditions. For this reason, in actual setting, heat preservation units are also preferably provided for the top cover 9 and the housing 8 to fully ensure the reliable maintenance of the test conditions.

[0044] Through the setting of the above distribution test device, the distribution test of biomass pellets in different gas-phase flow fields can be carried out, and the measured results of the distribution state of biomass pellets under different test conditions can be obtained.

[0045] Furthermore, as another aspect of the present invention, a verification method for the torque force model of biomass pellets is also designed based on the above distribution test device.

[0046] According to the force analysis of biomass pellets when moving in a fluid, the following rotation equation for non-spherical particles can be obtained:

[0047] In the formula, I is the moment of inertia; is the angular velocity, is the angular acceleration; is the torque force under the action of the fluid on the particle, is the sum of other torque forces except the fluid torque force.

[0048] Furthermore, the torque force formula of non-spherical particles is preferably:

[0049]

[0050] In the formula, is the torque force received by the biomass particle; is the dimensionless torque force coefficient; is the density of the air flow around the particle; represents the projected area perpendicular to the movement direction during the particle's falling process, and , where, is the equivalent spherical diameter, which is equal to the diameter of a sphere with the same volume as the non-spherical biomass particle; and are the velocities of the fluid and the particle respectively; is the angle between the fluid incoming flow direction and the major axis direction of the particle in the measurement area, that is, the incident angle at different times; represents the Reynolds number of a single particle; is the particle aspect ratio; is the ratio of the particle temperature to the air flow temperature, where the temperature of the biomass particle is recorded as room temperature.

[0051] Through the aforementioned torque force formula, it can be known that: the magnitude of the torque force of the biomass particle is a positive function of the dimensionless torque force coefficient , and for the dimensionless torque force coefficient , it is a function of Re , Ar , , θ , where: For Re , it represents the Reynolds number of a single particle; satisfying the formula: . When the shapes and sizes of the biomass particles are the same, Ar and are both constant. At this time, Re only relates to the flow velocities of the fluid and the particle. It should be noted that Re here is the Reynolds number of a single particle, rather than the Reynolds number of the inlet air velocity. During the falling process of each particle, ReIt is constantly changing. By changing the wind speed, the test conditions can be correspondingly changed. Re .

[0052] For Ar , it is the ratio of the long axis to the short axis of the particle (the particle is considered to be cylindrical or ellipsoidal). By changing the shape of the biomass particle, the test conditions can be correspondingly changed. Ar .

[0053] For , it is the ratio of the particle to the air flow temperature. Among them, the temperature of the biomass particle is recorded as room temperature. Thus, by changing the temperature of the air flow, the test conditions can be correspondingly changed. .

[0054] For , it is the angle between the fluid incoming flow direction and the long axis direction of the particle in the measurement area. During the test, the angle of each particle moving to each position can be directly obtained by means of software, and it is preferably recorded that the incident angles of each biomass particle initially entering the gas phase flow are the same.

[0055] Based on the above analysis, the verification method of the torque force model of biomass particles in the preferred embodiment preferably includes the following process: (1) Set up the physical distribution test device and construct a simulation model of the distribution test device according to the structural parameters of the physical object; In actual operation, the modeling of the distribution test device can preferably be carried out by software such as EDEM, OpenFOAM, Fluent, etc. The modeling parameters of the device are the same as those of the physical object, and the subsequent set test conditions and biomass particle parameters (structural shape and size parameters, etc.) are consistent with the parameters during the actual test of the distribution test device.

[0056] (2) Import the torque force model to be verified into the simulation model; By importing the torque force model to be verified into the simulation model, the simulation model can set the boundary conditions with reference to the test conditions of the physical device, and complete the torque force calculation of each biomass particle during its movement in the model with the help of the torque force model to be verified.

[0057] In addition, the movement trajectory of biomass particles in a gas-solid two-phase fluid is affected by gravity, torque force, buoyancy, drag force, and lift force. Among them, for a certain biomass particle, the magnitudes of its gravity and buoyancy are known, and the drag force and lift force at any moment can be calculated through existing models. Then, by calculating the magnitude of the torque force of the biomass particle at the corresponding moment, the magnitude and direction of the resultant force on the biomass particle at that moment can be obtained through force analysis. In this way, by calculating the magnitude and direction of the resultant force on the biomass particle at each moment, the movement trajectory of the biomass particle in the simulation model can be obtained, and then the landing point of the biomass particle at the bottom of the housing 8 in the simulation model can be determined, and finally the distribution of the biomass particles in the simulation model can be obtained.

[0058] (3) Set the test conditions of the distribution test device, conduct a physical distribution test of biomass particles through the distribution test device, and obtain the measured values of the distribution results of the biomass particles in the sector-shaped collection tank 7 at the bottom of the housing 8 under the corresponding test conditions.

[0059] In the preferred embodiment, the physical distribution test of biomass particles includes at least the following four cases: (3.1) Control the gas flow rate introduced into the housing 8 through the gas pipeline 4 to be constant with other temperatures, and keep the parameters of the biomass particles constant. After the set test time, count the distribution results of the biomass particles in the sector-shaped collection tank 7. (3.2) Keep the gas flow rate introduced into the housing 8 through the gas pipeline 4 constant, and keep the shape of the biomass particles unchanged. Adjust the air temperature, and count the distribution results of the biomass particles in the sector-shaped collection tank 7 after the set test time. (3.3) Keep the gas flow rate and air temperature introduced into the housing 8 through the gas pipeline 4 constant, change the parameters of the biomass particles, and count the distribution results of the biomass particles in the sector-shaped collection tank 7 after the set test time. (3.4) Keep the air temperature of the gas introduced into the housing 8 through the gas pipeline 4 unchanged, and keep the parameters of the biomass particles unchanged. Adjust the gas flow rate, and count the distribution results of the biomass particles in the sector-shaped collection tank 7 after the set test time.

[0060] (4) Set the same simulation test conditions in the simulation model for each group of test conditions in (3), and run the simulation model to obtain the simulation values of the distribution results of the biomass particles under each group of simulation test conditions. Obviously, when actually conducting the simulation test, the simulation test process of the biomass particles at least also includes the above four cases of (3.1) to (3.4), and four groups of simulation values of the distribution results are obtained.

[0061] (5) Compare the measured values of the distribution results of each group with the simulated values of the distribution results under the same test conditions, determine the error between the two distribution results, and evaluate the accuracy of the torque force model to be verified based on this.

[0062] According to the torque force coefficient formula, under the conditions of the same Reynolds number and temperature ratio, its torque force coefficient is a function of the aspect ratio and the particle incident angle. Thus, by making biomass particles of different particle sizes and putting them into the feeder 10, setting the wind speed and wind temperature of the air pump 1, the measured values of the distribution results of the particles in each sector collecting tank 7 are statistically obtained within a certain period of time. At the same time, in the numerical simulation, boundary conditions corresponding to the same particle size are set, and the simulated values of the distribution results of the particles in each collecting tank are statistically obtained within a certain period of time. By comparing the measured values of the distribution results with the simulated values of the distribution results, the calculation accuracy of the biomass particle torque force model under different particle parameter conditions can be verified.

[0063] Similarly, according to the torque force coefficient formula, under the conditions of the same Reynolds number and particle parameters, its torque force coefficient is a function of the temperature ratio and the particle incident angle. Thus, keeping the particle parameter conditions unchanged, by setting the wind speed and / or wind temperature of the air pump 1, the measured values of the distribution results of the particles in each sector collecting tank 7 can be statistically obtained within a certain period of time. At the same time, in the numerical simulation, boundary conditions corresponding to the same wind temperature and / or wind speed are set, and the simulated values of the distribution results of the particles in each collecting tank are statistically obtained within a certain period of time. By comparing the measured values of the distribution results with the simulated values of the distribution results, the calculation accuracy of the biomass particle torque force model under different wind temperature and / or different wind speed conditions can be verified.

[0064] It can be understood that during the actual test, the statistically obtained distribution results can be the quantity distribution results of the biomass particles or the mass distribution results of the biomass particles, which will not be elaborated here.

[0065] In addition, when conducting each group of tests in (3.2) to (3.4), it is preferred that there are multiple parameters to choose from for the variables in each group of tests. For example, in (3.2), there can be multiple changed wind temperature parameters, such as setting a wind temperature parameter that increases and a wind temperature parameter that decreases, and conducting tests for each wind temperature parameter respectively to obtain multiple groups of test results.

[0066] More specifically, in order to ensure the accuracy of the test results, for the tests under each test condition, it is preferred to conduct multiple identical test operations, and use the average value of the multiple test results as the final result under this test condition.

[0067] Of course, for the adjustment of parameters such as wind temperature and flow rate, the changes of the two can also be set in a continuously changing form. For example, the wind temperature continuously increases during the test time, or the flow rate continuously decreases during the test time, so as to obtain the corresponding test results.

[0068] Obviously, in the preferred embodiment, by setting up a simulation model for the distribution test device, then importing the torque force model to be verified into the simulation model, and designing the physical test conditions to be equivalent to the simulation test conditions, it is ensured that the measured values of the distribution results and the simulation values of the distribution results can maintain unified test conditions, and a basis is provided for the comparison of the two distribution results. Through the comparison of the measured values and the simulation values of the distribution results, the indirect verification of the torque force model to be verified is quickly and accurately completed, effectively avoiding the cumbersome process in the conventional model verification method, and improving the efficiency and accuracy of the torque force model verification.

[0069] Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A distribution test device for biomass particles, characterized in that: It comprises a shell having an internal test cavity and a gas phase flow field control component and a biomass particle feeding component arranged corresponding to the shell; The bottom of the shell is divided into a plurality of fan-shaped collecting grooves along the annular direction, which are used to collect biomass particles with different movement trajectories in different zones; The gas phase flow field control assembly includes an air pump, a bypass pipe, a connecting pipe and a gas pipeline; the two ends of the connecting pipe are respectively connected to the gas outlet of the air pump and one end of the gas pipeline; the other end of the gas pipeline extends into the top of the shell to provide power for the movement of the biomass particles and form a specific gas phase environment in the internal test cavity; the bypass pipe is connected to the connecting pipe to assist in adjusting the gas flow rate in the gas pipeline; and a flow valve is provided on the gas pipeline to monitor the gas flow rate and temperature in the gas pipeline; The biomass particle feeding assembly is arranged at the top of the shell, and its discharge port extends into the shell and faces the reflux area at the outlet of the gas pipeline, and is used to input biomass particles into the shell.

2. The biomass particle distribution test device according to claim 1, characterized in that: It also includes a computer, which exchanges data with the flow valve and the biomass particle feeding component through electronic components, and is used to receive gas parameters detected by the flow valve and control the biomass particle feeding component to feed into the shell at a specific feeding speed.

3. The biomass particle distribution test device according to claim 2, characterized in that: The biomass particle feeding assembly includes a feeder having a hopper and a conveyor belt; The funnel is arranged above the conveyor belt for loading biomass particles; the conveyor belt is arranged corresponding to the discharge port of the funnel, which is electrically connected to the computer and can be started and stopped under the control of the computer and control the input rate of the biomass particles into the shell.

4. The distribution test device for biomass particles according to any one of claims 1 to 3, characterized in that: The shell is a conical shell, the inner diameter of the top of which is larger than the inner diameter of the bottom; and / or The axis of the discharge port of the biomass particle feeding assembly is arranged orthogonally to the axis at the outlet of the gas pipeline.

5. The distribution test device for biomass particles according to any one of claims 1 to 3, characterized in that: The fan-shaped collecting trough is separated by a plurality of partitions, each of which has a thickness of 0.01 m to 0.03 m and a height of 0.2 m to 0.5 m.

6. A method for verifying a biomass particle torque force model, which is accomplished by using the biomass particle distribution test device according to any one of claims 1 to 5, characterized in that: The process includes the following: (1) constructing a simulation model of the device based on the physical object of the distributed test device; (2) Import the torque force model to be verified into the simulation model; (3) Setting the test conditions of the distribution test device, and conducting a physical distribution test of biomass particles, and obtaining the measured values ​​of the distribution results of the biomass particles in the fan-shaped collecting groove at the bottom of the shell under the corresponding test conditions; (4) corresponding to each group of test conditions in (3), the same simulation test conditions are set in the simulation model, and the simulation model is run to obtain the distribution result simulation value of the biomass particles under each group of simulation test conditions; (5) Compare the measured values ​​of each distribution result with the simulated values ​​of the distribution result under the same test conditions to determine the error between the two distribution results, and use this to evaluate the accuracy of the torque force model to be verified.

7. The biomass particle torque force model verification method according to claim 6, characterized in that: In process (3), the physical distribution test of biomass particles includes at least the following four situations: (3.1) Control the gas flow rate and other temperatures of the gas pipeline entering the shell to be constant, and keep the parameters of the biomass particles constant. After the set test time, the distribution results of the biomass particles in the fan-shaped collection tank are counted; (3.2) Keep the gas flow rate from the gas pipeline to the shell constant, and keep the shape of the biomass particles unchanged, adjust the wind temperature, and calculate the distribution results of the biomass particles in the fan-shaped collection tank after the set test time; (3.3) Keep the gas flow rate and wind temperature from the gas pipeline to the shell constant, change the parameters of the biomass particles, and calculate the distribution results of the biomass particles in the fan-shaped collection tank after the set test time; (3.4) Maintain the temperature of the gas entering the shell from the gas pipeline and the parameters of the biomass particles unchanged, adjust the gas flow rate, and calculate the distribution results of the biomass particles in the fan-shaped collection tank after the set test time.

8. The biomass particle torque force model verification method according to claim 7, characterized in that: When performing each set of tests in (3.2) to (3.4), the variables in each set of tests have multiple optional parameters.

9. The biomass particle torque force model verification method according to claim 7, characterized in that: When conducting each set of tests in (3.2) and (3.4), the variables in each set of tests change continuously.

10. The method for verifying the biomass particle torque force model according to any one of claims 7 to 9, characterized in that: For each set of tests in (3.1) to (3.4), the same test operation is performed multiple times, and the average value of the multiple test results is used as the final result under this test condition.

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