Test methods, apparatus, and evaluation methods for the heat dissipation capacity of dry-burning reactors.

Abstract

This application relates to a testing method, apparatus, and evaluation method for the drag coefficient of a dry koji pile. The testing method includes: setting up a first test model and a second test model; obtaining the mapping relationship between the pressure and flow rate of the gas inside the first and second test models; obtaining the inertial drag coefficient and viscous drag coefficient of the first and second test models respectively based on the mapping relationship; dividing the dry koji pile to be tested into a spatial grid and sampling each grid; obtaining the inertial drag coefficient and viscous drag coefficient of each grid based on the inertial drag coefficient and viscous drag coefficient of the first and second test models, as well as the distribution of koji blocks and koji powder in each grid. This application can comprehensively test the drag coefficient of the dry koji pile by obtaining the drag coefficient of each grid, resulting in more accurate and reliable test results, and providing sufficient data support for understanding the heat dissipation capacity of the dry koji pile.

Description

Technical Field

[0001] This application relates to the field of testing technology, and in particular to a method, apparatus, and method for evaluating the heat dissipation capacity of a dry-burning pile. Background Technology

[0002] Based on their particle size, dried koji can be specifically divided into koji powder and koji blocks, which are usually piled up into dried koji heaps during storage. Dried koji heaps are prone to spontaneous combustion because during storage, the microorganisms inside the dried koji continuously generate heat through respiration; when the heat generated by the dried koji heap exceeds the heat dissipated, the dried koji heap is at risk of spontaneous combustion.

[0003] Therefore, to prevent spontaneous combustion of dry koji piles, it is necessary to accurately determine their heat dissipation capacity and, in conjunction with real-time monitoring of their heat generation capacity, provide early warning of spontaneous combustion. Experience shows that the heat dissipation capacity of a dry koji pile is directly related to its drag coefficient; the higher the drag coefficient, the worse its heat dissipation capacity. Therefore, understanding the drag coefficient of a dry koji pile provides data support for determining its heat dissipation capacity.

[0004] However, in existing technologies, due to the large space required for storing koji piles, the resistance coefficient of dry koji is easily affected by environmental factors, making it difficult to guarantee the accuracy of test results. Summary of the Invention

[0005] Based on this, this application provides a method, apparatus, and evaluation method for the resistance coefficient of dry-cured piles, in order to improve the problem that the resistance coefficient of dry-cured piles is difficult to obtain accurately in the prior art.

[0006] In a first aspect, this application provides a method for testing the resistance coefficient of a dry-cured pile, the method comprising:

[0007] A first test model and a second test model are set up, wherein the first test model includes a plurality of curved blocks stacked in a ventilation space, and the second test model includes a plurality of curved blocks stacked in the ventilation space and curved powder filling the spaces between the curved blocks;

[0008] Obtain the mapping relationship between the pressure and flow rate of the gas inside the first test model and the second test model;

[0009] The inertial drag coefficient and viscous drag coefficient of the first test model and the second test model are obtained respectively based on the mapping relationship between the pressure and flow rate of the gas inside the first test model and the second test model.

[0010] The dry koji pile to be tested is divided into spatial grids, and each grid is sampled to obtain the distribution of the koji blocks and koji powder within each grid;

[0011] The inertial drag coefficient and viscous drag coefficient of each grid are obtained based on the inertial drag coefficient and viscous drag coefficient of the first test model and the second test model, as well as the distribution of the curved blocks and the powder in each grid.

[0012] In one embodiment, the inertial drag coefficient and viscous drag coefficient of the first test model and the second test model are obtained respectively based on the mapping relationship between the pressure and flow rate of the gas inside the first test model and the second test model, including:

[0013] Based on the mapping relationship between the pressure and flow rate of the gas inside the first test model and the second test model, respectively, the pressure-flow rate curves of the gas inside the first test model and the second test model are plotted, and the formulas for fitting the pressure-flow rate curves are fitted.

[0014] The inertial drag coefficient and the viscous drag coefficient of the first test model and the second test model are obtained respectively according to the formula of the gas inside the first test model and the second test model.

[0015] In one embodiment, the mathematical expressions for the inertial drag coefficient and the viscous drag coefficient of the first test model and the second test model, respectively, are obtained according to the formulas for the gases inside the first test model and the second test model, as follows:

[0016]

[0017] Where ΔP is the gas pressure, v is the gas velocity, and μ is the gas viscosity coefficient. C1 is the viscous drag coefficient, C2 is the inertial drag coefficient, ρ is the gas density, and Δm is the thickness of the curved block and powder in the first test model or the curved block and powder in the second test model.

[0018] In one embodiment, the inertial drag coefficient and the viscous drag coefficient of the first test model and the second test model are obtained respectively according to the formulas for the gases inside the first test model and the second test model, including:

[0019] Obtain the internal temperatures of the first test model and the second test model;

[0020] The viscosity coefficients of the gases inside the first test model and the second test model are obtained based on the temperatures inside the first test model and the second test model, respectively.

[0021] The inertial drag coefficient and the viscous drag coefficient of the first test model and the second test model are obtained respectively according to the mathematical expression.

[0022] In one embodiment, obtaining the mapping relationship between the pressure and flow rate of the gas inside the first test model and the second test model includes:

[0023] The pressure in the ventilation space where the first test model and the second test model are located is increased sequentially;

[0024] The flow rates of the gas inside the first test model and the second test model at various pressures in the ventilation space are obtained sequentially.

[0025] In one embodiment, the inertial drag coefficient and viscous drag coefficient of each grid are obtained based on the inertial drag coefficient and viscous drag coefficient of the first test model and the second test model, as well as the distribution of the curved blocks and the powder in each grid, including:

[0026] The proportions of the first test model and the second test model within each grid are obtained based on the distribution of the curved blocks and the powder determined after sampling of each grid.

[0027] The inertial drag coefficient and viscous drag coefficient of each grid are obtained based on the inertial drag coefficient and viscous drag coefficient of the first test model and the second test model, as well as the proportion of the first test model and the second test model in each grid.

[0028] In one embodiment, setting a first test model and a second test model includes:

[0029] The first test model is set up in two groups, and the dry koji blocks are set up before storage and after storage for a certain period of time, respectively.

[0030] The second test model is set up with two sets, which are respectively set up using the koji blocks and koji powder before storage and the koji blocks and koji powder after storage for a certain period of time.

[0031] In one embodiment, the dry koji pile to be tested is divided into a spatial grid, and each grid is sampled to obtain the distribution of the koji blocks and koji powder within each grid, including:

[0032] The dry torpedo stack to be tested is divided into spatial grids, wherein the spatial grids are established in a three-dimensional coordinate system and all grids are set to cuboid shape;

[0033] Each of the grids is sampled to obtain the distribution of the spherical blocks and spherical powder within each grid, wherein each grid has a plurality of sampling points.

[0034] Secondly, this application provides a testing apparatus for implementing any of the dry torsion pile resistance coefficient testing methods provided in this application, the testing apparatus comprising:

[0035] A housing, which is hollow, is in which the first test model or the second test model is disposed;

[0036] A fan, which is connected to the housing and is used to construct the ventilation space;

[0037] A flow meter, connected between the housing and the fan, is used to obtain the flow rate of the gas inside the first test model or the second test model; and

[0038] A pressure gauge is mounted on the housing and is used to obtain the pressure of the ventilation space.

[0039] Thirdly, this application provides a method for evaluating the heat dissipation capacity of a dry-burning reactor, the evaluation method comprising:

[0040] The inertial drag coefficient and the viscous drag coefficient of each grid in the dry pile are obtained according to any of the dry pile drag coefficient test methods provided in this application.

[0041] A mapping relationship is preset to evaluate the heat dissipation capacity based on the inertial drag coefficient and the viscous drag coefficient, and the heat dissipation capacity of each grid is obtained based on the inertial drag coefficient and the viscous drag coefficient of each grid.

[0042] This application sets up a first test model and a second test model, obtains the resistance coefficients of the first test model and the second test model, and divides the dry torn pile to be tested into a spatial grid and samples each grid. By obtaining the resistance coefficient of each grid, the resistance coefficient of the dry torn pile can be obtained through comprehensive testing. The test results are more accurate and reliable, and can provide sufficient data support for understanding the heat dissipation capacity of the dry torn pile. Attached Figure Description

[0043] Figure 1 A flowchart illustrating the test method for the dry-brick pile resistance coefficient provided in Embodiment 1 of this application;

[0044] Figure 2 A schematic diagram of the pressure-flow rate curve of the first test model provided in Embodiment 1 of this application;

[0045] Figure 3 This is a schematic diagram of the pressure-flow rate curve of the second test model provided in Embodiment 1 of this application;

[0046] Figure 4 This is a schematic diagram of the test apparatus for implementing the test method for the resistance coefficient of a dry torn pile, as provided in Embodiment 2 of this application.

[0047] Figure 5 This is a flowchart of the method for evaluating the heat dissipation capacity of a dry-burning reactor provided in Embodiment 3 of this application.

[0048] Attached reference numerals: 10, housing; 20, fan; 30, flow meter; 40, pressure gauge. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0050] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention.

[0051] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0052] The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "middle," "longitudinal," "lateral," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] Example 1

[0054] Embodiment 1 of this application provides a method for testing the drag coefficient of a dry-brick pile, such as... Figure 1 As shown, the test methods include:

[0055] S100. Set up a first test model and a second test model, wherein the first test model includes several curved blocks piled up in a ventilation space, and the second test model includes several curved blocks piled up in a ventilation space and gluten powder filled between the curved blocks;

[0056] S200. Obtain the mapping relationship between the pressure and flow rate of the gas inside the first test model and the second test model;

[0057] S300. Obtain the inertial drag coefficient and viscous drag coefficient of the first test model and the second test model respectively based on the mapping relationship between the pressure and flow rate of the gas inside the first test model and the second test model.

[0058] S400. Divide the dry koji pile to be tested into a spatial grid and sample each grid to obtain the distribution of koji blocks and koji powder within each grid;

[0059] S500. Obtain the inertial drag coefficient and viscous drag coefficient of each grid based on the inertial drag coefficient and viscous drag coefficient of the first test model and the second test model, as well as the distribution of curved blocks and powder in each grid.

[0060] In this embodiment, it is exemplarily illustrated that in step S100, both the koji blocks and the koji powder are composed of dry koji, the difference being the size of the particles during coagulation. The koji blocks are dry koji with larger particles forming a block shape; when several koji blocks are actually stacked to form a dry koji pile, the gaps inside the dry koji pile are relatively large. The koji powder, on the other hand, is dry koji with smaller particles forming a powder shape; when several koji blocks are filled with koji powder to form a dry koji pile, the gaps inside the dry koji pile are relatively small, or even almost non-existent. The first test model and the second test model are test models simulating the actual dry koji piles under the aforementioned two states.

[0061] The first and second test models are set up in a ventilated space, which can be understood as a space where the internal gas can circulate relatively smoothly. The ventilated space is a test model simulating the space in which the actual dry koji pile is stacked. In this embodiment, the dry koji pile can actually be stacked inside the dry koji fermentation chamber, which may also include an air conditioning system to accelerate the gas circulation speed inside the chamber.

[0062] In step S200, the mapping relationship between the pressure and flow rate of the gas inside the first test model and the second test model can be a test table of the pressure and flow rate of the gas inside the first test model and the second test model. That is, the purpose of step S200 is to obtain the test data of the pressure and flow rate of the gas inside the first test model and the second test model. It can be understood that the pressure and flow rate of the gas inside the first test model and the second test model should have a one-to-one correspondence.

[0063] In step S300, the data of the test tables of gas pressure and flow rate inside the first test model and the second test model are processed to obtain the inertial drag coefficient and viscous drag coefficient of the first test model and the second test model respectively, that is, to obtain the inertial drag coefficient and viscous drag coefficient when several curved blocks are stacked, and the inertial drag coefficient and viscous drag coefficient when several curved blocks are stacked and the curved blocks are filled with curd powder.

[0064] In step S400, the dry koji pile to be tested is the actual dry koji pile, which can be divided into several spatial grids when it is piled up inside the dry koji fermentation chamber. In this embodiment, each grid is sampled. The sampling process can be completed with the assistance of a perforated sampling device to accurately obtain the distribution of koji blocks and koji powder in each grid.

[0065] In step S500, after obtaining the distribution of koji blocks and koji powder in each grid, the inertial drag coefficient and viscous drag coefficient of each grid of the dry koji pile can be obtained by combining the inertial drag coefficient and viscous drag coefficient of the first test model and the second test model, so as to achieve the purpose of obtaining the drag coefficient of the dry koji pile through comprehensive testing.

[0066] It is understood that this application sets up a first test model and a second test model, obtains the resistance coefficients of the first test model and the second test model, and divides the dry torn pile to be tested into a spatial grid and samples each grid. By obtaining the resistance coefficient of each grid, the resistance coefficient of the dry torn pile can be obtained through comprehensive testing. The test results are more accurate and reliable, and can provide sufficient data support for understanding the heat dissipation capacity of the dry torn pile.

[0067] Specifically, based on the mapping relationship between the pressure and flow rate of the gas inside the first and second test models, the inertial drag coefficient and viscous drag coefficient of the first and second test models are obtained respectively, i.e., step S300, which includes:

[0068] S310. Based on the mapping relationship between the pressure and flow rate of the gas inside the first test model and the second test model, respectively draw the pressure-flow rate curves of the gas inside the first test model and the second test model, and fit the formula of the pressure-flow rate curve.

[0069] S320. Obtain the inertial drag coefficient and viscous drag coefficient of the first test model and the second test model respectively according to the formula of the gas inside the first test model and the second test model.

[0070] In this embodiment, by way of example, in step S310, a pressure-flow curve is plotted based on the obtained pressure and flow rate test table. The pressure-flow curve, also known as the PV curve, reflects the change in the flow velocity of the gas inside the tested working fluid. The pressure-flow curve is established in a two-dimensional coordinate system, with the vertical axis representing the relative pressure of the gas before and after passing through the tested working fluid, i.e., the pressure drop; in this embodiment, the relative pressure is the pressure drop of the gas after passing through the first test model or the second test model. The horizontal axis can be velocity, which can be obtained by converting flow rate. Specifically, flow rate can be mass flow rate or volumetric flow rate. Mass flow rate divided by the fluid density equals volumetric flow rate, and volumetric flow rate divided by the fluid's unit cross-section equals the fluid velocity; in this embodiment, the fluid is the gas inside the dry torsion chamber, and the gas is mainly composed of air. After the pressure-flow curve is plotted, the formula for the pressure-flow curve can be obtained by fitting the curve.

[0071] In step S320, after fitting the formula for the pressure-flow curve, the inertial drag coefficient and viscous drag coefficient are obtained according to the formula.

[0072] More specifically, based on the formulas for the gases inside the first and second test models, the mathematical expressions for the inertial drag coefficient and viscous drag coefficient of the first and second test models, respectively, are obtained as follows:

[0073]

[0074] Where ΔP is the gas pressure, v is the gas velocity, and μ is the gas viscosity coefficient. C1 is the viscous drag coefficient, C2 is the inertial drag coefficient, ρ is the gas density, and Δm is the thickness of the curved block and powder in the first test model or the curved block and powder in the second test model.

[0075] It is understandable that in step S320, the viscous drag coefficient can be obtained from the first power coefficient of the formula, and the inertial drag coefficient can be obtained from the second power coefficient of the formula.

[0076] More specifically, the inertial drag coefficient and viscous drag coefficient of the first and second test models are obtained respectively according to the formulas for the gases inside the first and second test models, i.e., step S320, including:

[0077] S321. Obtain the internal temperatures of the first and second test models;

[0078] S322. Obtain the viscosity coefficients of the gases inside the first test model and the second test model based on the temperatures inside the first test model and the second test model, respectively;

[0079] S323. Obtain the inertial drag coefficient and viscous drag coefficient of the first test model and the second test model respectively according to the mathematical expression.

[0080] In this embodiment, it is illustrated by way of example that in step S321, the temperature inside the first test model and the second test model can be obtained by a temperature sensor, and the temperature probe of the temperature sensor can be inserted into the first test model and the second test model.

[0081] In step S322, experience shows that the viscosity coefficient of a gas varies with temperature, and the relationship between the viscosity coefficient of air and temperature is shown in Table 1.

[0082] Table 1. Viscosity coefficients of gases at different temperatures (1 atmosphere)

[0083]

[0084] After obtaining the internal temperatures of the first and second test models, the corresponding viscosity coefficient of the gas is obtained based on the temperature.

[0085] In step S323, the obtained viscosity coefficient of the gas is substituted into the aforementioned mathematical expression to obtain the inertial drag coefficient and viscous drag coefficient of the first test model and the second test model.

[0086] It is understood that by obtaining the temperatures of the first and second test models and then obtaining the viscosity coefficients of the gas inside the first and second test models based on the temperatures, the accuracy of the test results for the drag coefficients of the first and second test models can be improved.

[0087] Specifically, obtaining the mapping relationship between the pressure and flow rate of the gas inside the first test model and the second test model, i.e., step S200, includes:

[0088] S210. Increase the pressure in the ventilation space where the first test model and the second test model are located in sequence;

[0089] S220. Sequentially obtain the flow rate of the gas inside the first test model and the second test model at various pressures in the ventilation space.

[0090] In this embodiment, it is exemplarily explained that in step S210, the pressure of the ventilation space where the first test model and the second test model are located is also the pressure of the gas inside the first test model and the second test model. By sequentially pressurizing the ventilation space where the first test model and the second test model are located, different pressure data of the gas inside the first test model and the second test model can be obtained. Each time the pressure is increased, it can be increased to a specified pressure, which can be selected according to actual needs.

[0091] In step S220, after the pressure in the ventilation space changes, the gas flow rate inside the first and second test models changes accordingly. The gas flow rate in the ventilation space is measured after each pressurization. Subsequently, a test table is created to map the pressure and flow rate of the gas inside the first and second test models, thus obtaining the pressure-flow rate mapping relationship.

[0092] It is understood that this embodiment obtains the corresponding flow rate by sequentially applying pressure, which is easy to operate and can ensure the accuracy of the mapping relationship between the obtained pressure and flow rate, thereby improving the accuracy of the test results of the resistance coefficient of the first test model and the second test model.

[0093] In this embodiment, the test tables for the pressure and flow rate of the gas inside the first test model and the second test model are shown in Table 2 and Table 3, respectively.

[0094] Table 2. Pressure and Flow Test Results for the First Test Model

[0095] P(pa) <![CDATA[V(m 3 / h)]]> 16.5 142.2 15 133.7 13.5 125 12.7 121.9 11.2 116.4 10.5 109.6 9.7 108.7 8.2 97.8 6.7 93.54 5.9 86.51 5.1 74.38 3.6 73.6 2.9 53.86 1.3 35.34

[0096] Table 3. Pressure and Flow Test Table for the Second Test Model

[0097]

[0098]

[0099] The pressure-flow rate curves of the gas inside the first and second test models, and the formulas for fitting the pressure-flow rate curves are as follows: Figure 2 and Figure 3 As shown, Figure 2 and Figure 3 In the two-dimensional coordinate system, the horizontal axis represents the gas velocity v, with units of m / s, and the vertical axis represents the gas relative pressure P, with units of Pa. Figure 2 and Figure 3 The solid lines with dots represent the pressure-flow rate curves, while the solid lines without dots represent the curves corresponding to the fitted pressure-flow rate curve formula.

[0100] The viscous drag coefficient can be obtained from the first power coefficient of the formula for the first test model and the inertial drag coefficient can be obtained from the second power coefficient of the formula, as shown in Tables 4 and 5.

[0101] Table 4. Inertial drag coefficient and viscous drag coefficient of the first test model

[0102]

[0103] Table 5. Inertial drag coefficient and viscous drag coefficient of the second test model

[0104]

[0105] Specifically, the inertial drag coefficient and viscous drag coefficient of each grid are obtained based on the inertial drag coefficient and viscous drag coefficient of the first and second test models, as well as the distribution of curved blocks and powder in each grid. This is step S500, which includes:

[0106] S510. Based on the distribution of the curved blocks and powder determined after sampling of each grid, obtain the proportion of the first test model and the second test model within each grid;

[0107] S520. Obtain the inertial drag coefficient and viscous drag coefficient of each grid based on the inertial drag coefficient and viscous drag coefficient of the first test model and the second test model, as well as the proportion of the first test model and the second test model in each grid.

[0108] In this embodiment, it is illustrated by way of example that in step S510, based on the distribution of koji blocks and koji powder determined after sampling of each grid, the proportion of koji blocks and koji powder in the dry koji within the grid can be obtained. This proportion can be the mass proportion. Then, based on this proportion, the proportion of the first test model and the second test model in each grid is calculated.

[0109] For example, in the first test model, the proportion of curved blocks within the model can be defined as 1, and the proportion of kerosene within the model as 0; in the second test model, the proportion of curved blocks within the model is 0.8, and the proportion of kerosene within the model is 0.2. However, in actual sampling, if the proportions of kerosene in a curved block within the dry curved blocks of a grid are 0.9 and 0.1 respectively, then calculations can yield that the proportions of the first and second test models within that grid are 0.5 and 0.5 respectively.

[0110] In step S520, after obtaining the proportion of the first test model and the second test model in each grid, the inertial drag coefficient and viscous drag coefficient of each grid can be obtained according to the inertial drag coefficient and viscous drag coefficient of the first test model and the second test model. For example, the inertial drag coefficient and viscous drag coefficient of each grid are the inertial drag coefficient and viscous drag coefficient of the first test model multiplied by their proportion, plus the inertial drag coefficient and viscous drag coefficient of the second test model multiplied by their proportion.

[0111] Specifically, setting up the first test model and the second test model, i.e., step S100, includes:

[0112] S110. Set up the first test model, wherein the first test model is set up with two sets, and the dry koji blocks before storage and the dry koji blocks after storage for a certain period of time are respectively set up;

[0113] S120. Set up a second test model, wherein the second test model is set up with two groups, and respectively using koji blocks and koji powder before storage and koji blocks and koji powder after storage for a certain period of time.

[0114] In this embodiment, it is illustrated by way of example that in steps S110 and S120, the koji blocks in the first test model and the koji blocks and koji powder in the second test model are all from actual dry koji piles, and from dry koji piles at different time periods, namely, the dry koji piles that have just entered the dry koji fermentation chamber and the dry koji piles that have been stored in the dry koji fermentation chamber for a certain period of time. The aforementioned certain period of time can be set according to actual needs.

[0115] When the actual storage time of the dry koji pile is between the first test model and the second test model, the proportion of the actual storage time of the dry koji pile in the total time difference between the first test model and the second test model can be calculated, and the resistance coefficient of the actual dry koji pile can be corrected according to the resistance coefficients of the two sets of first test models and second test models, thereby further improving the accuracy of the test results of the resistance coefficient of the actual dry koji pile.

[0116] Specifically, the dry koji pile to be tested is divided into spatial grids, and samples are taken from each grid to obtain the distribution of koji blocks and koji powder within each grid, i.e., step S400, which includes:

[0117] S410. Perform spatial meshing on the dry bend pile to be tested. The spatial mesh is established in a three-dimensional coordinate system, and all meshes are set to cuboid shape.

[0118] S420. Sample each grid to obtain the distribution of the spherical blocks and spherical powder within each grid, wherein several sampling points are set on each grid.

[0119] In this embodiment, by way of example, in step S410, the mesh is divided into several sections that are parallel to the XY plane, YZ plane and XZ plane of the three-dimensional coordinate system. The several sections are evenly spaced along the X direction, Y direction and Z direction of the three-dimensional coordinate system to form a cuboid mesh of equal volume.

[0120] In step S420, each grid is sampled several times to comprehensively obtain the distribution of koji blocks and koji powder within each grid, thereby improving the accuracy of the resistance coefficient test results for each grid. For grids located inside the dry koji pile, sampling can be performed after sampling of the outer grid is completed. In this case, the drilling sampling device passes through the drill hole formed on the outer grid and extends into the grid located inside the dry koji pile.

[0121] Example 2

[0122] Embodiment 2 of this application provides a testing apparatus for implementing any of the dry torsion pile resistance coefficient testing methods provided in this application. The testing apparatus includes:

[0123] The enclosure 10 is hollow, and the first test model or the second test model is set inside the enclosure 10.

[0124] Fan 20 is connected to housing 10 and is used to create a ventilation space;

[0125] A flow meter 30 is connected between the housing 10 and the fan 20, and is used to obtain the flow rate of the gas inside the first test model or the second test model; and

[0126] Pressure gauge 40 is mounted on housing 10 and is used to obtain the pressure of the ventilation space.

[0127] like Figure 4 As shown in this embodiment, the housing 10 can be exemplarily configured as a cuboid and can be made of transparent acrylic sheet. A fan 20 can be connected to the housing 10 via a pipe, allowing ventilation into the housing 10. The housing 10 is used to hold several curved blocks or to hold several curved blocks and the powder filling between the blocks to construct a first test model or a second test model. A flow meter 30 can be installed on the pipe, connecting the housing 10 and the fan 20, to measure the flow rate of the gas inside the first or second test model. A pressure machine can be installed on the top side of the housing 10 and can measure the pressure of the ventilation space to obtain the pressure of the gas inside the first or second test model.

[0128] It is understood that this embodiment constructs a first test model and a second test model by setting up a housing 10 and a fan 20. By setting up a flow meter 30 and a pressure machine, the resistance coefficients of the first test model and the second test model can be obtained. This is combined with the method of dividing the dry charcoal pile under test into spatial grids and sampling each grid. The resistance coefficient of each grid of the dry charcoal pile is obtained by comprehensive testing, and the test results are more accurate and reliable. This can provide sufficient data support for understanding the heat dissipation capacity of the dry charcoal pile.

[0129] Example 3

[0130] Embodiment 3 of this application provides a method for evaluating the heat dissipation capacity of a dry-blow pile, such as... Figure 5 As shown, the evaluation methods include:

[0131] S600. Obtain the inertial drag coefficient and viscous drag coefficient of each grid in the dry pile according to any of the dry pile drag coefficient test methods provided in this application;

[0132] S700. Presets a mapping relationship for evaluating heat dissipation capacity based on inertial drag coefficient and viscous drag coefficient, and obtains the heat dissipation capacity of each grid based on the inertial drag coefficient and viscous drag coefficient of each grid.

[0133] In this embodiment, step S600 is illustrated by way of example, and has been specifically described in Embodiment 1, so it will not be repeated here. In step S700, the mapping relationship between the inertial drag coefficient and the viscous drag coefficient for evaluating heat dissipation capacity can be an evaluation table of the inertial drag coefficient and the viscous drag coefficient for heat dissipation capacity, as shown in Table 6.

[0134] Table 6 Evaluation of the heat dissipation capacity of dry-burning reactors

[0135]

[0136] The basis for presetting Table 6 is: the mathematical expression of the momentum source for obtaining the resistance encountered by gas flowing in the dry curing pile is:

[0137]

[0138] Among them, S i It serves as a momentum source.

[0139] It can be seen that the momentum source of the resistance comes from two parts: the inertial drag coefficient and the viscous drag coefficient. The larger the inertial drag coefficient and the viscous drag coefficient are, the greater the resistance encountered by the gas, the slower the gas flow rate, and the worse the heat dissipation capacity of the dry torsion reactor.

[0140] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0141] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for testing the drag coefficient of a dry-cured pile, characterized in that, The testing method includes: A first test model and a second test model are set up. The first test model includes several koji blocks piled up in a ventilation space. The second test model includes several koji blocks piled up in the ventilation space and koji powder filling the spaces between the koji blocks. Both the first test model and the second test model are test models that simulate the state of the dry koji pile to be tested. The ventilation space is used to simulate the chamber of the dry koji fermentation chamber. The dry koji pile to be tested is piled up inside the dry koji fermentation chamber. Obtain the mapping relationship between the pressure and flow rate of the gas inside the first test model and the second test model; The inertial drag coefficient and viscous drag coefficient of the first test model and the second test model are obtained respectively based on the mapping relationship between the pressure and flow rate of the gas inside the first test model and the second test model. The dry koji pile to be tested is divided into spatial grids, and each grid is sampled to obtain the distribution of the koji blocks and koji powder within each grid; The inertial drag coefficient and viscous drag coefficient of each grid are obtained based on the inertial drag coefficient and viscous drag coefficient of the first test model and the second test model, as well as the distribution of the curved blocks and the powder in each grid.

2. The method for testing the dry-brick pile resistance coefficient according to claim 1, characterized in that, Based on the mapping relationship between the gas pressure and flow rate inside the first and second test models, the inertial drag coefficient and viscous drag coefficient of the first and second test models are obtained respectively, including: Based on the mapping relationship between the pressure and flow rate of the gas inside the first test model and the second test model, respectively, the pressure-flow rate curves of the gas inside the first test model and the second test model are plotted, and the formulas for fitting the pressure-flow rate curves are fitted. The inertial drag coefficient and the viscous drag coefficient of the first test model and the second test model are obtained respectively according to the formula of the gas inside the first test model and the second test model.

3. The method for testing the dry-brick pile resistance coefficient according to claim 2, characterized in that, Based on the formulas for the gases inside the first and second test models, the mathematical expressions for the inertial drag coefficient and the viscous drag coefficient of the first and second test models, respectively, are as follows: Where ΔP is the gas pressure, v is the gas velocity, and μ is the gas viscosity coefficient. C1 is the viscous drag coefficient, C2 is the inertial drag coefficient, ρ is the gas density, and Δm is the thickness of the curved block and powder in the first test model or the curved block and powder in the second test model.

4. The method for testing the dry-brick pile resistance coefficient according to claim 3, characterized in that, The inertial drag coefficient and viscous drag coefficient of the first test model and the second test model are obtained respectively according to the formulas for the gas inside the first test model and the second test model, including: Obtain the internal temperatures of the first test model and the second test model; The viscosity coefficients of the gases inside the first test model and the second test model are obtained based on the temperatures inside the first test model and the second test model, respectively. The inertial drag coefficient and the viscous drag coefficient of the first test model and the second test model are obtained respectively according to the mathematical expression.

5. The method for testing the dry-brick pile resistance coefficient according to claim 1, characterized in that, Obtain the mapping relationship between the pressure and flow rate of the gas inside the first test model and the second test model, including: The pressure in the ventilation space where the first test model and the second test model are located is increased sequentially; The flow rates of the gas inside the first test model and the second test model at various pressures in the ventilation space are obtained sequentially.

6. The method for testing the dry-brick pile resistance coefficient according to claim 1, characterized in that, The inertial drag coefficient and viscous drag coefficient of each grid are obtained based on the inertial drag coefficient and viscous drag coefficient of the first test model and the second test model, as well as the distribution of the curved blocks and the powder in each grid, including: The proportions of the first test model and the second test model within each grid are obtained based on the distribution of the curved blocks and the powder determined after sampling of each grid. The inertial drag coefficient and viscous drag coefficient of each grid are obtained based on the inertial drag coefficient and viscous drag coefficient of the first test model and the second test model, as well as the proportion of the first test model and the second test model in each grid.

7. The method for testing the dry-brick pile resistance coefficient according to claim 1, characterized in that, Set up the first test model and the second test model, including: The first test model is set up in two groups, and the dry koji blocks are set up before storage and after storage for a certain period of time, respectively. The second test model is set up with two sets, which are respectively set up using the koji blocks and koji powder before storage and the koji blocks and koji powder after storage for a certain period of time.

8. The method for testing the dry-brick pile resistance coefficient according to claim 1, characterized in that, The dry koji pile to be tested is divided into spatial grids, and samples are taken from each grid to obtain the distribution of the koji blocks and koji powder within each grid, including: The dry torpedo stack to be tested is divided into spatial grids, wherein the spatial grids are established in a three-dimensional coordinate system and all grids are set to cuboid shape; Each of the grids is sampled to obtain the distribution of the spherical blocks and spherical powder within each grid, wherein each grid has a plurality of sampling points.

9. A testing apparatus for implementing the test method for the dry-brick pile resistance coefficient as described in any one of claims 1 to 8, characterized in that, The testing apparatus includes: The housing (10) is hollow, and the first test model or the second test model is disposed inside the housing (10); A fan (20) is connected to the housing (10) and is used to construct the ventilation space; A flow meter (30), which is connected between the housing (10) and the fan (20), is used to obtain the flow rate of the gas inside the first test model or the second test model; and A pressure gauge (40) is installed on the housing (10) and is used to obtain the pressure of the ventilation space.

10. A method for evaluating the heat dissipation capacity of a dry-burning reactor, characterized in that, The evaluation methods include: The inertial drag coefficient and the viscous drag coefficient of each grid in the dry pile are obtained according to the test method of the dry pile drag coefficient as described in any one of claims 1 to 8. A mapping relationship is preset to evaluate the heat dissipation capacity based on the inertial drag coefficient and the viscous drag coefficient, and the heat dissipation capacity of each grid is obtained based on the inertial drag coefficient and the viscous drag coefficient of each grid.

Images