Method and device for determining coal storage amount of thermal power generating unit

Abstract

The invention provides a method and device for determining the coal storage amount of a thermal power generating unit, and belongs to the field of coal supply. The method comprises the following steps: acquiring a plurality of images of a target coal pile in a plurality of directions, and determining the volume of the target coal pile according to the plurality of images in the plurality of directions; wherein the multiple images cover the target coal pile; obtaining an electromagnetic wave signal reflected by the target coal pile, and determining the density and low calorific value of the target coal pile according to the electromagnetic wave signal; and determining the coal storage amount and the total heat of the target coal pile according to the volume of the target coal pile and the density and the low calorific value of the target coal pile. The coal pile volume is calculated according to the coal pile image, the density and the low heating value of the coal pile are determined in combination with electromagnetic wave detection, and rapid and accurate estimation of the coal storage amount can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal supply, and in particular to a method and device for determining the amount of stored coal in a thermal power unit. Background Art

[0002] The centralized dispatching thermal power units need to participate in the evening peak supply during the summer and the heating supply during the winter. As the only fuel for thermal power units, the stock of raw coal determines their peak output, load-carrying continuous capacity and other supply capabilities. Therefore, based on the supply demand, it is necessary to accurately evaluate the coal stock and calorific value of thermal power units to provide data support for decision-making.

[0003] In the existing technology, the coal storage and calorific value of thermal power units are usually estimated by manual estimation, supply and sales balance estimation and verification calculation by external inventory companies. The accuracy is low and the inspection cycle is long, which cannot meet the actual application needs. Summary of the invention

[0004] The embodiment of the present invention provides a method and device for determining the coal storage amount of a thermal power unit, so as to solve the problem that the coal storage amount and calorific value of a thermal power unit are estimated by manual estimation, supply and marketing balance estimation and verification calculation by an external inventory company in the prior art, which has low accuracy and long inspection cycle.

[0005] In a first aspect, an embodiment of the present invention provides a method for determining the amount of coal stored in a thermal power unit, comprising:

[0006] Acquire multiple images of a target coal pile at multiple locations, and determine the volume of the target coal pile according to the multiple images at multiple locations; wherein the multiple images cover the target coal pile;

[0007] Acquire the electromagnetic wave signal reflected by the target coal pile, and determine the density and low calorific value of the target coal pile according to the electromagnetic wave signal;

[0008] The coal storage amount and total heat value of the target coal pile are determined according to the volume, density and low calorific value of the target coal pile.

[0009] In a second aspect, an embodiment of the present invention provides a device for determining the amount of coal stored in a thermal power unit, comprising:

[0010] A parameter acquisition module is used to acquire multiple images of a target coal pile in multiple directions, and determine the volume of the target coal pile according to the multiple images in multiple directions; wherein the multiple images cover the target coal pile;

[0011] A parameter prediction module is used to obtain the electromagnetic wave signal reflected by the target coal pile, and determine the density and low calorific value of the target coal pile according to the electromagnetic wave signal;

[0012] The result output module is used to determine the coal storage amount and total heat of the target coal pile according to the volume, density and low calorific value of the target coal pile.

[0013] The embodiment of the present invention provides a method and device for determining the amount of coal stored in a thermal power unit. The above-mentioned method for determining the amount of coal stored in a thermal power unit includes: obtaining multiple images of a target coal pile in multiple directions, and determining the volume of the target coal pile based on the multiple images in multiple directions; wherein the multiple images cover the target coal pile; obtaining the electromagnetic wave signal reflected by the target coal pile, and determining the density and low calorific value of the target coal pile based on the electromagnetic wave signal; determining the amount of coal stored and the total heat of the target coal pile based on the volume of the target coal pile and the density and low calorific value of the target coal pile. In the embodiment of the present invention, the volume of the coal pile is calculated based on the coal pile image, and the density and low calorific value of the coal pile are determined in combination with the electromagnetic wave detection technology. It does not rely on experience and is less affected by human subjectivity. It can realize accurate detection of the amount of coal stored, and the data processing process is simple and the detection speed is fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 This is a flow chart of a method for determining the amount of coal stored in a thermal power unit provided by an embodiment of the present invention;

[0016] Figure 2 is a top view of the deployment position of the drone provided by an embodiment of the present invention;

[0017] Figure 3 is a schematic diagram of a slice of a contour model provided by an embodiment of the present invention;

[0018] Figure 4 It is a structural schematic diagram of a device for determining the amount of coal stored in a thermal power unit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0021] See also Figure 1 , which shows a flow chart of a method for determining the amount of coal stored in a thermal power unit provided by an embodiment of the present invention, which is described in detail as follows:

[0022] The above-mentioned method for determining the amount of coal stored in a thermal power unit includes:

[0023] S101: acquiring multiple images of a target coal pile in multiple directions, and determining the volume of the target coal pile according to the multiple images in multiple directions; wherein the multiple images cover the target coal pile;

[0024] In the embodiment of the present invention, images of the target coal pile are collected, and the volume of the target coal pile is determined based on the multiple images obtained by collection.

[0025] Specifically, in a possible implementation manner, the multiple directions are four directions around the target coal pile;

[0026] The filming equipment is carried by drones to four locations for filming;

[0027] The drone is also used to obtain a signal transmitted by the elevation transmitter, and determine the current position of the shooting device based on the signal transmitted by the elevation transmitter;

[0028] The signal transmitted by the elevation transmitter includes a transmission angle and direction.

[0029] In the embodiment of the present invention, the drone can carry the shooting equipment to four designated positions for shooting. Figure 2 , so that the images from the four directions can completely cover the target coal pile, so that the image of the entire target coal pile can be spliced. When the shape of the coal pile is irregular, it can also be photographed from 5 directions, 6 directions or even more directions, in order to obtain an image that can cover the entire target coal pile.

[0030] At the same time, elevation transmitters are set up around the coal pile to determine the current location information of the drone, that is, the location information of the shooting equipment when taking the image, to facilitate subsequent signal processing.

[0031] S102: Acquire the electromagnetic wave signal reflected by the target coal pile, and determine the density and low calorific value of the target coal pile according to the electromagnetic wave signal;

[0032] The density of a material refers to the mass of a substance per unit volume, while the dielectric constant describes the energy storage capacity of a dielectric in an electric field. When the molecular density of a material decreases, the mass of the electrons per unit volume decreases, resulting in a decrease in the density of electrons per unit volume, which in turn reduces the dielectric constant.

[0033] It can be seen that the density of the target coal pile is related to the dielectric constant of the coal pile, and the density can be determined based on the dielectric constant of the target coal pile. When electromagnetic waves are used to irradiate different materials, the dielectric constants of different materials are different, and the reflectivity of electromagnetic waves is also different. Therefore, the density of the target coal pile can be determined by the reflectivity of electromagnetic waves.

[0034] The electromagnetic wave signal can select the electromagnetic wave with the wavelength that the CC bond and CH bond in the raw coal react most sensitively, so that the detection is more accurate.

[0035] S103: Determine the coal storage amount and total calorific value of the target coal pile according to the volume, density and low calorific value of the target coal pile.

[0036] Based on the above, after calculating the volume and density of the target coal pile, the coal storage and total heat can be determined according to the volume and density of the target coal pile. The above-mentioned method for determining the coal storage of a thermal power unit uses image and electromagnetic wave detection technology to determine the coal storage and low calorific value of the target coal pile. It does not rely on experience and is not affected by human subjective factors. The detection results are accurate and the detection speed is fast. It can realize fast, accurate and non-destructive detection of the coal storage of the target coal pile.

[0037] In a possible implementation, S101 may include:

[0038] S1011: Obtaining the position of the shooting device corresponding to each image;

[0039] S1012: forming a contour model of the target coal pile according to each image and the position of the shooting device corresponding to each image;

[0040] S1013: Determine the volume of the target coal pile based on the contour model of the target coal pile.

[0041] Since the target coal pile is usually conical, in the embodiment of the present invention, a contour line model is established according to the image and the position information corresponding to each image, and the volume of the target coal pile is determined based on the contour line model.

[0042] Specifically, the coordinates of each point on the image can be determined according to the position of the shooting device and the image, and then the coordinates of each point on the target coal pile can be obtained by splicing to form a contour line model.

[0043] Among them, the method for establishing the contour line model is a conventional technical means in this field, and the details will not be repeated here.

[0044] In a possible implementation, S1013 may include:

[0045] 1. Horizontally cut the contour model of the target coal pile according to the preset interval to obtain multiple slices;

[0046] 2. For any slice, determine the area of ​​the slice, and multiply the area of ​​the slice by the preset spacing to obtain the volume of the slice;

[0047] 3. Add the volumes of each slice to obtain the volume of the target coal pile.

[0048] refer to Figure 3 In the embodiment of the present invention, the contour model can be horizontally cut to obtain multiple slices. Figure 3 When the preset spacing is small enough, the difference between the upper and lower base areas can be ignored, and the height of the slice is not considered. The area of ​​the slice (the area can be calculated due to the contour model) is directly multiplied by the preset spacing to obtain the volume of the slice. The volume of each slice can be obtained by adding up the volumes of the target coal pile.

[0049] In a further embodiment, S1013 may include:

[0050] 1. Horizontally cut the contour model of the target coal pile according to the preset interval to obtain multiple slices;

[0051] 2. For any slice, calculate the average of the upper and lower base areas of the slice, multiply the average by the preset spacing to obtain the volume of the slice;

[0052] 3. Add the volumes of each slice to obtain the volume of the target coal pile.

[0053] In the embodiment of the present invention, the difference between the upper base area and the lower base area can be further considered, and the slice can be equivalent to a trapezoid. The volume of the slice is calculated using the average of the upper base area and the lower base area, and the calculation result is more accurate.

[0054] In a possible implementation, S102 may include:

[0055] S1021: determining the dielectric constant of the target coal pile according to the electromagnetic wave signal;

[0056] S1022: Determine the density of the target coal pile according to the dielectric constant and the preset nominal density;

[0057] S1023: Determine the low calorific value of the target coal pile according to the density of the target coal pile and the preset nominal low calorific value.

[0058] The results of manual sampling for coal pile density detection are relatively accurate, but since there are multiple coal piles in a coal yard, if each coal pile is manually sampled to determine the density of the coal pile, the workload is too large, which wastes manpower and material resources and affects the detection cycle. Based on this, since there are differences between each coal pile, but the difference is not very large, in the embodiment of the present invention, only one coal pile can be sampled for density detection, which is used as the preset nominal density. The nominal density is used as a reference, and then the difference between each coal pile is reflected by the electromagnetic wave signal to correct the nominal density, so as to obtain an accurate coal pile density, thereby avoiding the detection error caused by the use of electromagnetic wave detection alone.

[0059] Exemplarily, S1021 may specifically include determining a reflectivity based on the electromagnetic wave signal, and determining a dielectric constant based on the reflectivity. Determining the dielectric constant based on the reflectivity is a conventional technical means in the art, and will not be described in detail herein.

[0060] In a possible implementation, S1022 may include:

[0061] 1. Input the dielectric constant into the density prediction model to obtain the predicted density;

[0062] 2. Use the predicted density to correct the nominal density and obtain the density of the target coal pile.

[0063] Based on the above analysis, it can be seen that the density of the material is related to the dielectric constant; the neural network model has powerful nonlinear mapping capabilities, self-learning and adaptive capabilities, generalization capabilities, etc. Therefore, in the embodiment of the present invention, a neural network model can be used to establish a density prediction model, and the dielectric constant can be used as input to predict the density of the target coal pile to obtain the predicted density.

[0064] Specifically, the above method may also include: establishing a basic neural network model, training the basic neural network model, and obtaining a density prediction model. The specific training process is a conventional technical means, and will not be described in detail here. Among them, the type of the basic neural network model can be set according to actual application requirements, for example, it can be a CNN network, an RNN network, an LSTM network, a GNN network, etc.

[0065] In a possible implementation, using the predicted density to correct the nominal density to obtain the density of the target coal pile may include:

[0066] (1) Calculate the difference between the predicted density and the nominal density, and determine whether the difference is within a preset range;

[0067] (2) If yes, then the predicted density and the nominal density are weighted and summed to obtain the density of the target coal pile;

[0068] (3) If not, the nominal density is taken as the density of the target coal pile.

[0069] In the embodiment of the present invention, the nominal density is used as a reference. If the predicted density is not much different from the nominal density, it means that the density predicted by the electromagnetic wave signal is relatively accurate, and the predicted density and the nominal density can be weighted and summed to obtain the density of the target coal pile. If the predicted density is quite different from the nominal density, it means that the electromagnetic wave signal prediction is inaccurate. In this case, the predicted density is discarded and the relatively accurate nominal density is used as the density of the target coal pile.

[0070] Furthermore, when it is detected that the difference between the predicted density and the nominal density is not within the preset range, the electromagnetic wave signal and the density prediction model can be used again to predict a new predicted density, and the difference between the predicted density and the nominal density can be detected again. If the difference is still very large, the predicted density is discarded.

[0071] At the same time, since the nominal density is the density determined by random sampling in the coal yard, it may be the density of other coal piles. Therefore, when the difference is detected to be too large again, the density of the target coal pile can be manually sampled to determine whether there is any abnormality in the burning of the target coal pile.

[0072] It should be noted that the weight when weighting the predicted density and the nominal density can be set according to actual application requirements, and is not specifically limited here.

[0073] In a possible implementation, S1023 may include:

[0074] 1. Multiply the density of the target coal pile by the calorific value coefficient to obtain the predicted low calorific value;

[0075] 2. Use the predicted low calorific value to correct the nominal low calorific value to obtain the low calorific value of the target coal pile.

[0076] Density is strongly correlated with low calorific value. The density of the target coal pile is multiplied by the calorific value coefficient to obtain the predicted low calorific value, which is then corrected to obtain the final low emission.

[0077] Similarly, calculate the difference between the predicted low calorific value and the nominal low calorific value; if the difference is within the preset range, perform the weighted sum of the predicted low calorific value and the nominal low calorific value to obtain the low calorific value of the target coal pile; if the difference is not within the preset range, use the nominal low calorific value as the low calorific value of the target coal pile to eliminate possible calculation deviations and improve the accuracy of the calculation.

[0078] It should be noted that the preset range here is different from the preset range corresponding to density correction.

[0079] In a possible implementation, the above method may further include:

[0080] S104: for any target coal pile in the coal yard, repeatedly execute the steps of acquiring multiple images of the target coal pile in multiple directions, and determining the volume of the target coal pile according to the multiple images in multiple directions, and determining the coal storage amount and total heat amount of the target coal pile according to the volume of the target coal pile, the density of the target coal pile and the low calorific value, to obtain the coal storage amount and total heat amount of each target coal pile;

[0081] S105: Accumulate the coal storage amount of each target coal pile in the coal yard to obtain the total coal storage amount of the coal yard;

[0082] S106: The total heat of each target coal pile in the coal yard is accumulated to obtain the total heat value of the coal yard.

[0083] Since there are multiple coal piles in the coal yard, in the embodiment of the present invention, steps S101 to S103 are performed for each coal pile respectively, the coal storage amount and total heat of each coal pile are calculated and then summed, and the formula is as follows:

[0084]

[0085] Among them, B is the total coal storage in the coal yard, B i is the coal storage capacity of the ith coal pile, ρ i The density of the ith coal pile, V i is the volume of the ith coal pile; G is the total calorific value of the coal yard, G i is the total heat of the ith coal pile, Q i The low calorific value of the i-th coal pile.

[0086] The total coal storage and total calorific value of the entire coal yard can be calculated by the above formula, thus realizing the monitoring of the entire coal yard.

[0087] Furthermore, for each coal yard, the calculation can be repeated three times, and the average of the two times with a deviation less than 5% is taken as the final result for daily reporting, thereby realizing online monitoring of the coal inventory in the coal yard.

[0088] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0089] The following is an embodiment of the device of the present invention. For details not described in detail therein, reference may be made to the corresponding method embodiment described above.

[0090] Figure 4 The structural schematic diagram of the device for determining the amount of coal stored in a thermal power unit provided by an embodiment of the present invention is shown. For the convenience of explanation, only the part related to the embodiment of the present invention is shown, which is described in detail as follows:

[0091] like Figure 4As shown, the device for determining the amount of coal stored in a thermal power unit comprises:

[0092] The parameter acquisition module 21 is used to acquire multiple images of the target coal pile in multiple directions, and determine the volume of the target coal pile according to the multiple images in multiple directions; wherein the multiple images cover the target coal pile;

[0093] The parameter prediction module 22 is used to obtain the electromagnetic wave signal reflected by the target coal pile, and determine the density and low calorific value of the target coal pile according to the electromagnetic wave signal;

[0094] The result output module 23 is used to determine the coal storage amount and total heat of the target coal pile according to the volume, density and low calorific value of the target coal pile.

[0095] In a possible implementation, the parameter acquisition module 21 may include:

[0096] A position parameter acquisition unit, used to acquire the position of the shooting device corresponding to each image;

[0097] A model building unit, used to form a contour model of the target coal pile according to each image and the position of the shooting device corresponding to each image;

[0098] The volume determination unit is used to determine the volume of the target coal pile according to the contour model of the target coal pile.

[0099] In a possible implementation, the volume determination unit may include:

[0100] A slicing subunit is used to horizontally slice the contour model of the target coal pile according to a preset interval to obtain a plurality of slices;

[0101] The slice volume calculation subunit is used to determine the area of ​​any slice and multiply the area of ​​the slice by a preset interval to obtain the volume of the slice;

[0102] The accumulation subunit is used to accumulate the volumes of each slice to obtain the volume of the target coal pile.

[0103] In a possible implementation manner, the multiple directions are four directions around the target coal pile;

[0104] The filming equipment is carried by drones to four locations for filming;

[0105] The drone is also used to obtain a signal transmitted by the elevation transmitter, and determine the current position of the shooting device based on the signal transmitted by the elevation transmitter;

[0106] The signal transmitted by the elevation transmitter includes a transmission angle and direction.

[0107] In a possible implementation, the parameter prediction module 22 may include:

[0108] A dielectric constant determination unit, used to determine the dielectric constant of the target coal pile according to the electromagnetic wave signal;

[0109] A density determination unit, used to determine the density of the target coal pile according to the dielectric constant and the preset nominal density;

[0110] The calorific value determination unit is used to determine the low calorific value of the target coal pile according to the density of the target coal pile and a preset nominal low calorific value.

[0111] In a possible implementation, the density determination unit may include:

[0112] A density prediction subunit, used for inputting the dielectric constant into the density prediction model to obtain a predicted density;

[0113] The density correction subunit is used to correct the nominal density using the predicted density to obtain the density of the target coal pile.

[0114] In a possible implementation manner, the density correction subunit may be specifically used for:

[0115] 1. Calculate the difference between the predicted density and the nominal density, and determine whether the difference is within the preset range;

[0116] 2. If yes, then the predicted density is weighted and summed with the nominal density to obtain the density of the target coal pile;

[0117] 3. If not, the nominal density is taken as the density of the target coal pile.

[0118] In a possible implementation, the heat value determination unit may include:

[0119] The calorific value prediction subunit is used to multiply the density of the target coal pile by the calorific value coefficient to obtain the predicted low calorific value;

[0120] The calorific value correction subunit is used to correct the nominal low calorific value by using the predicted low calorific value to obtain the low calorific value of the target coal pile.

[0121] In a possible implementation manner, the above device may further include:

[0122] A cyclic calculation module is used for repeatedly executing the steps of acquiring multiple images of the target coal pile in multiple directions for any target coal pile in the coal yard, and determining the volume of the target coal pile according to the multiple images in multiple directions, and determining the coal storage amount and total heat amount of the target coal pile according to the volume of the target coal pile and the density and low calorific value of the target coal pile, so as to obtain the coal storage amount and total heat amount of each target coal pile;

[0123] The coal storage output module of the coal yard is used to accumulate the coal storage of each target coal pile in the coal yard to obtain the total coal storage of the coal yard;

[0124] The coal yard calorific value output module is used to accumulate the total heat of each target coal pile in the coal yard to obtain the total calorific value of the coal yard.

[0125] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0126] Those of ordinary skill in the art will appreciate that the templates, units, and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0127] If the module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, it can implement the steps of the above-mentioned embodiments of the method for determining the amount of coal stored in each thermal power unit. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form. Computer-readable media may include: any entity or device that can carry computer program code, recording media, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal and software distribution medium.

[0128] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A method for determining the amount of coal stored in a thermal power unit, characterized in that: include: Acquire multiple images of a target coal pile in multiple orientations, and determine the volume of the target coal pile according to the multiple images in multiple orientations; wherein the multiple images cover the target coal pile; Acquire the electromagnetic wave signal reflected by the target coal pile, and determine the density and low calorific value of the target coal pile according to the electromagnetic wave signal; The coal storage amount and total calorific value of the target coal pile are determined according to the volume of the target coal pile, the density of the target coal pile and the low calorific value.

2. The method for determining the amount of coal stored in a thermal power unit according to claim 1, characterized in that: Determining the volume of the target coal pile according to the multiple images in the multiple directions includes: Obtain the location of the shooting device corresponding to each image; According to each image and the position of the shooting device corresponding to each image, a contour model of the target coal pile is formed; The volume of the target coal pile is determined according to the contour model of the target coal pile.

3. The method for determining the amount of coal stored in a thermal power unit according to claim 2, characterized in that: Determining the volume of the target coal pile according to the contour model of the target coal pile includes: horizontally cutting the contour model of the target coal pile according to a preset interval to obtain a plurality of slices; For any slice, determine the area of ​​the slice, and multiply the area of ​​the slice by the preset interval to obtain the volume of the slice; The volumes of the various slices are added up to obtain the volume of the target coal pile.

4. The method for determining the amount of coal stored in a thermal power plant according to claim 2, characterized in that: The multiple directions are four directions around the target coal pile; The shooting equipment is carried by a drone to the four positions for shooting; The drone is also used to obtain a signal transmitted by the elevation transmitter, and determine the current position of the shooting device based on the signal transmitted by the elevation transmitter; The signal transmitted by the elevation transmitter includes a transmission angle and a direction.

5. The method for determining the amount of coal stored in a thermal power unit according to any one of claims 1 to 4, characterized in that: The step of determining the density and low calorific value of the target coal pile according to the electromagnetic wave signal includes: Determining the dielectric constant of the target coal pile according to the electromagnetic wave signal; Determining the density of the target coal pile according to the dielectric constant and the preset nominal density; The lower calorific value of the target coal pile is determined according to the density of the target coal pile and a preset nominal lower calorific value.

6. The method for determining the amount of coal stored in a thermal power plant according to claim 5, characterized in that: Determining the density of the target coal pile according to the dielectric constant and the preset nominal density includes: Inputting the dielectric constant into a density prediction model to obtain a predicted density; The predicted density is used to correct the nominal density to obtain the density of the target coal pile.

7. The method for determining the amount of coal stored in a thermal power plant according to claim 6, characterized in that: The step of correcting the nominal density by using the predicted density to obtain the density of the target coal pile includes: Calculating a difference between the predicted density and the nominal density, and determining whether the difference is within a preset range; If yes, the predicted density and the nominal density are weighted and summed to obtain the density of the target coal pile; If not, the nominal density is used as the density of the target coal pile.

8. The method for determining the amount of coal stored in a thermal power unit according to claim 5, characterized in that: The step of determining the low calorific value of the target coal pile according to the density of the target coal pile and the preset nominal low calorific value comprises: Multiplying the density of the target coal pile by the calorific value coefficient to obtain the predicted low calorific value; The predicted low calorific value is used to correct the nominal low calorific value to obtain the low calorific value of the target coal pile.

9. The method for determining the amount of coal stored in a thermal power unit according to any one of claims 1 to 4, characterized in that: The method further comprises: For any target coal pile in the coal yard, the steps of obtaining multiple images of the target coal pile in multiple directions, and determining the volume of the target coal pile according to the multiple images in multiple directions, to the step of determining the coal storage amount and total heat amount of the target coal pile according to the volume of the target coal pile and the density and low calorific value of the target coal pile, are repeated to obtain the coal storage amount and total heat amount of each target coal pile; Accumulating the coal storage volume of each target coal pile in the coal yard to obtain the total coal storage volume of the coal yard; The total heat of each target coal pile in the coal yard is accumulated to obtain the total calorific value of the coal yard.

10. A device for determining the amount of coal stored in a thermal power unit, characterized in that: include: A parameter acquisition module, used for acquiring multiple images of a target coal pile in multiple directions, and determining the volume of the target coal pile according to the multiple images in multiple directions; wherein the multiple images cover the target coal pile; A parameter prediction module, used for acquiring the electromagnetic wave signal reflected by the target coal pile, and determining the density and low calorific value of the target coal pile according to the electromagnetic wave signal; The result output module is used to determine the coal storage amount and total heat of the target coal pile according to the volume of the target coal pile, the density of the target coal pile and the low calorific value.

Images