Ash correction-based coal yard calorific value loss measurement method and system

Abstract

The application provides a coal yard heat value loss measurement method and system based on ash correction, which comprises the following steps: testing the ash content and received low calorific value of incoming coal; transmitting the incoming coal number, ash content and low calorific value to a data recording and processing system; when coal is taken from the coal pile, the coal taking device automatically records the coal pile number, and automatically weighs the coal through the weighing device of the coal conveying belt and transmits the data to the data recording and processing system; at the same time, the coal sample on the belt is automatically sampled by the automatic uniform sampling device of the coal conveying belt, and the low calorific value and ash content of the sample are tested and recorded; after each coal taking from the coal pile is completed, the data recording and processing system automatically calculates the total mass and heat value loss of the coal taken from the coal pile in real time, and the heat value loss calculation formula is shown in the description; after all the coal in the coal pile is taken, the heat value loss statistics of the numbered coal pile are completed, and the data are automatically saved. The application solves the technical problems of low accuracy of heat value loss measurement and difficulty in measuring the total mass of the coal pile.

Description

Technical Field

[0001] The present invention relates to the field of power plant equipment data processing, and in particular to a method and system for measuring calorific value loss in a coal yard based on ash correction. Background Art

[0002] In coal-fired power plants, coal costs account for approximately two-thirds of total production and operating costs. Coal storage yards are crucial for coal storage and supply, crucial for safe and stable operation. Coal storage methods in coal-fired power plants primarily include open-pit coal yards, semi-enclosed strip coal yards, cylindrical silos in parallel clusters, semi-enclosed circular coal yards, and fully enclosed coal bunkers. Open-pit coal yards (open coal yards) are a traditional coal storage method in my country. While cost-effective, they occupy a large area and are significantly affected by weather conditions, particularly strong winds, which often cause coal dust to disperse everywhere, polluting the environment and causing coal loss. Once coal is piled in the coal yard, it undergoes a low-temperature oxidation reaction with oxygen in the air. This oxidation process is primarily driven by physical and chemical reactions within the coal pile. Upon contact with air, the coal first physically adsorbs oxygen from the air, releasing heat of physical adsorption. Subsequently, chemical adsorption and chemical reactions with oxygen occur, releasing both heat of chemical adsorption and chemical reaction. When the heat released by oxidation exceeds the heat dissipation capacity, the heat will accumulate, causing the local temperature to rise and accelerating the oxidation of the coal pile, thereby causing the coal composition in the coal pile to change, and the total mass of the coal pile will also change. The process of low-temperature oxidation of coal is not consistent for different types of coal. Moreover, since the low-temperature oxidation process of coal piles is difficult to predict and monitor, the calorific value loss of coal piles cannot be accurately predicted. Currently, most power plants test the calorific value of coal by sampling coal quality, converting the calorific value to the same moisture level to calculate the calorific value loss of the coal yard. The calculation formula is as follows:

[0003] ,

[0004] Where: Q is the converted lower calorific value of the incoming coal, kJ / kg; Qa is the actual lower calorific value of the incoming coal, kJ / kg; Mt1 is the total moisture content of the incoming coal; and Mt2 is the total moisture content of the incoming coal. The existing invention patent, "A Device and Method for Rapidly Detecting Ash Content and Calorific Value of Coal," with publication number CN106680417A, includes an oxygen bomb, a pressure detection unit, a high-pressure control unit, a throttling unit, a CO2 detection unit, a PLC control unit, a host computer, an electronic analytical balance, and a power supply. It also includes a device and method for rapidly detecting coal ash content and calorific value: determining ash content using the ratio of coal mass before and after combustion, determining dry-basis higher calorific value using the CO2 concentration after pressure stabilization and the peak pressure, determining air-dry-basis lower calorific value using dry-basis higher calorific value, and determining as-received lower calorific value using air-dry-basis lower calorific value. The patent's description indicates that it calculates coal ash content by comparing the coal's mass before and after combustion, calculates the higher calorific value of the coal on a dry basis by using the volumetric concentration of CO2, and calculates the lower calorific value of the coal after drying in air. Ultimately, the lower calorific value of the coal is calculated by measuring the moisture content of the coal on an as-received basis and the moisture content of the coal on an air-dried basis. This patent does not disclose the technical solution used by the present application to correct for changes in the mass of the coal pile based on changes in coal ash content, comprehensively considering changes in the total mass of the coal pile and changes in the calorific value of coal samples within the pile. Furthermore, this patent requires gas data monitoring, significantly different from the present application and unable to measure coal field calorific value losses based on ash content.

[0005] In summary, the existing technology has technical problems such as low accuracy in measuring calorific value loss and difficulty in measuring the total mass of the coal pile. Summary of the Invention

[0006] The technical problem to be solved by the present invention is how to solve the technical problems of low accuracy in measuring calorific value loss and difficulty in measuring the total mass of a coal pile.

[0007] The present invention solves the above technical problems by adopting the following technical solutions: A method for measuring calorific value loss in a coal field based on ash correction includes:

[0008] S1. Collect and obtain the ash content data and received low calorific value data of the coal entering the factory;

[0009] S2, transmitting the incoming coal number, the ash content data and the received basic low calorific value data to the data recording and processing system (7);

[0010] S3. When taking coal from the coal pile, the coal taking device (2) automatically records the coal pile number, weighs the coal using a weighing device (4) provided on the coal conveyor belt (3), and transmits the coal quality data to the data recording and processing system (7), and uses an automatic uniform sampling device (5) provided on the side of the coal conveyor belt (3) to obtain a coal sample, and uses a testing unit (6) to test the low calorific value detection data and ash content detection data of the coal sample and transmits the data to the data recording and processing system (7). The step S3 also includes:

[0011] S31, processing the coal quality data and the ash content data using a preset multiplication logic to obtain a coal pile mass-ash content relationship;

[0012] S32. Based on the coal pile mass-ash relationship data, a preset proportional relationship is used to obtain a ratio of the current and original total mass of the coal pile;

[0013] S33, processing the average calorific value of the coal sample and the total mass of the coal pile using a preset multiplication logic to obtain the total calorific value of the coal pile, and based on this, obtain the total low calorific value of the coal pile;

[0014] S34, processing the mass-ash relationship of the coal pile and the total low calorific value of the coal pile using a preset logic to obtain the low calorific value detection data;

[0015] S4. Each time coal is taken from the current coal pile, the data recording and processing system (7) is used to process the low calorific value detection data and the ash detection data according to a preset logic to obtain the real-time total mass of the coal taken from the coal pile and the real-time calorific value loss data, and the real-time calorific value loss data is counted and saved.

[0016] This method comprehensively considers changes in the lower heating value of coal and changes in the total mass of the coal pile during storage, enabling a more accurate and realistic characterization of the calorific value loss of the coal pile during storage. This method uses the total available lower heating value as a research object, taking into account the fact that the total ash mass of the coal pile does not change during storage. By using changes in the coal ash content to correct for changes in the coal pile mass, this method comprehensively considers changes in the total mass of the coal pile and changes in the calorific value of coal samples from the coal pile, using the coal ash content correction to determine the calorific value loss of the coal pile, thereby improving the measurement accuracy of calorific value loss.

[0017] In a more specific technical solution, step S1 includes:

[0018] S11. Pile coal into the factory to obtain not less than 2 coal piles;

[0019] S12, numbering the coal piles;

[0020] S13. Collect and obtain the ash data and the received base low calorific value data of the coal pile according to the number.

[0021] In a more specific technical solution, step S31 includes:

[0022] S311. Collect and obtain the total mass of the coal pile, the received basis ash content of the coal pile, and the total ash content of the coal pile;

[0023] S312. Process the total mass of the coal pile, the received base ash content of the coal pile, and the total ash content of the coal pile using the following logic to obtain the mass-ash content relationship of the coal pile:

[0024] Aar1*M1=Aar2*M2,

[0025] Where Aar1 represents the received ash content of coal entering the factory, Aar2 represents the received ash content of coal entering the furnace, M1 represents the total mass of coal entering the factory, and M2 represents the total mass of coal entering the furnace.

[0026] In a more specific technical solution, in step S32, the following logic is used to process the mass-ash relationship of the coal pile to obtain the ratio of the current to original total mass of the coal pile:

[0027] X=M2 / M1=Aar1 / Aar2,

[0028] Where X is the coal pile weight coefficient.

[0029] The ash content of the coal pile of the present invention can be obtained through chemical analysis. By utilizing the coal pile weight coefficient and the logic for obtaining related mass parameters, the change in the total mass of the coal pile can be expressed by the change in the ash content, thus solving the problem that the total mass of the coal pile is difficult to weigh directly.

[0030] In a more specific technical solution, in step S33, the average calorific value of the coal sample and the total mass of the coal pile are processed according to the following logic to obtain the total calorific value of the coal pile:

[0031] Q=Q a ×M,

[0032] Among them, Q is the total calorific value of the coal pile, Qa is the lower calorific value of the coal sample in the coal pile, and M is the total mass of the coal pile.

[0033] In a more specific technical solution, in step S33, the total mass of the coal pile and the low calorific value of the coal sample are processed according to the following logic to obtain the total low calorific value of the coal pile:

[0034] Q1=Q a1 ×M1

[0035] Q2=Q a2 ×M2,

[0036] Among them, Q1 is the total calorific value of the coal entering the factory, Qa1 is the low calorific value of the coal sample entering the factory, Q2 is the total calorific value of the coal entering the furnace, kJ, and Qa2 is the low calorific value of the coal sample entering the furnace.

[0037] The present invention truly reflects the coal pile during storage. Based on the principle that the total mass of ash in the coal pile does not change during storage, the calorific value loss of the coal yard is obtained based on the coal ash correction processing. The present invention comprehensively considers the changes in the low calorific value of coal and the total mass changes of the coal pile during storage, and can more accurately and truly characterize the calorific value loss of the coal pile during storage.

[0038] In a more specific technical solution, in step S34, the mass-ash relationship of the coal pile and the total low-heating value of the coal pile are processed using the following logic to obtain the low-heating value detection data:

[0039] ,

[0040] Among them, α is the calorific value loss ratio of the coal pile.

[0041] Because the calorific value loss of a coal yard includes both weight loss and heat loss, the present invention uses the total calorific value of the coal pile to more objectively characterize the calorific value loss of the coal pile. This study uses the coal pile in a coal yard as the research object, taking advantage of the fact that the total ash mass of the coal pile does not change during storage. By using the change in coal ash content to correct for changes in the coal pile mass, the present invention can accurately calculate the weight loss of the coal pile during storage.

[0042] In a more specific technical solution, in step S3, the calorific value of the coal sample is taken as the average calorific value of the coal pile.

[0043] In a more specific technical solution, in step S4, the following logic is used to obtain the real-time total mass of coal taken from the coal pile and the real-time calorific value loss data, and the real-time calorific value loss data is counted and saved:

[0044] ,

[0045] in It represents the total coal mass after n times of coal removal, and α is the calorific value loss ratio of the coal pile.

[0046] Although there are errors in weighing by the weighing belt, the present invention uses the same weighing device in the coal taking process, and the calculation process adopts the mass ratio for calculation, so the result is more accurate.

[0047] In a more specific technical solution, a coal yard calorific value loss measurement system based on ash correction includes:

[0048] The collection unit is used to collect the ash content data and received low calorific value data of the coal entering the factory;

[0049] An incoming coal data transmission unit, used to transmit the incoming coal number, the ash content data and the received basic low calorific value data to a data recording and processing system (7), wherein the incoming coal data transmission unit is connected to the acquisition unit;

[0050] A low calorific value and ash content detection unit is used to automatically record the coal pile number with a coal taking device (2) when taking coal from a coal pile, weigh the coal through a weighing device (4) provided on a coal conveyor belt (3) and transmit the coal quality data to the data recording and processing system (7), sample the coal sample using an automatic uniform sampling device (5) provided at the side of the coal conveyor belt (3), and test the low calorific value detection data and ash content detection data of the coal sample with a testing unit (6) and transmit the data to the data recording and processing system (7), wherein the low calorific value and ash content detection unit is connected to the incoming coal data transmission unit, and the low calorific value and ash content detection unit further comprises:

[0051] a mass-ash relationship processing component, configured to process the coal mass data and the ash data using a preset multiplication logic to obtain a mass-ash relationship of the coal pile;

[0052] a coal pile mass ratio processing component, configured to process the coal pile mass-ash relationship data using a preset proportional relationship to obtain a ratio of the existing to the original total mass of the coal pile, the coal pile mass ratio processing component being connected to the mass-ash relationship processing component;

[0053] a total low calorific value processing component, which processes the average calorific value of the coal sample and the total mass of the coal pile using a preset multiplication logic to obtain the total calorific value of the coal pile, and thereby obtains the total low calorific value of the coal pile; the total low calorific value processing component is connected to the coal pile mass ratio processing component;

[0054] a low calorific value detection component, configured to process the coal pile mass-ash relationship and the total low calorific value of the coal pile using preset logic to obtain low calorific value detection data, wherein the low calorific value detection component is connected to the coal pile mass ratio processing component and the total low calorific value processing component;

[0055] The data recording and processing system (7) is used to process the low calorific value detection data and the ash detection data according to a preset logic each time coal is taken from the current coal pile, so as to obtain the real-time total mass of the coal taken from the coal pile and the real-time calorific value loss data, and to count and save the real-time calorific value loss data.

[0056] After exploring the relationship between ash content and coal pile quality, this paper further explores the relationship between coal pile calorific value loss and changes in ash content and lower calorific value based on the total available lower calorific value. This paper proposes a method for measuring coal yard calorific value loss based on ash content correction. Furthermore, a system is designed to automatically calculate and record coal yard calorific value loss.

[0057] The present invention has the following advantages over the prior art: It comprehensively considers the changes in the low calorific value of coal and the changes in the total mass of the coal pile during storage, and can more accurately and truly characterize the calorific value loss of the coal pile during storage. The present invention takes the coal pile in the coal yard as the research object, based on the total available low calorific value, and utilizes the characteristic that the total ash mass of the coal pile does not change during storage. The change in the ash content of the coal is used to correct the mass change of the coal pile. The present invention comprehensively considers the total mass change of the coal pile and the calorific value change of the coal samples in the coal pile, and obtains the calorific value loss of the coal yard based on the coal ash content correction, thereby improving the measurement accuracy of the calorific value loss.

[0058] The ash content of the coal pile of the present invention can be obtained through chemical analysis. By utilizing the coal pile weight coefficient and the logic for obtaining related mass parameters, the change in the total mass of the coal pile can be expressed by the change in the ash content, thus solving the problem that the total mass of the coal pile is difficult to weigh directly.

[0059] The present invention truly reflects the coal pile during storage. Based on the principle that the total mass of ash in the coal pile does not change during storage, the calorific value loss of the coal yard is obtained based on the coal ash correction processing. The present invention comprehensively considers the changes in the low calorific value of coal and the total mass changes of the coal pile during storage, and can more accurately and truly characterize the calorific value loss of the coal pile during storage.

[0060] Because the calorific value loss of a coal yard includes both weight loss and heat loss, the present invention uses the total calorific value of the coal pile to more objectively characterize the calorific value loss of the coal pile. This study uses the coal pile in a coal yard as the research object, taking advantage of the fact that the total ash mass of the coal pile does not change during storage. By using the change in coal ash content to correct for changes in the coal pile mass, the present invention can accurately calculate the weight loss of the coal pile during storage.

[0061] After exploring the relationship between ash content and coal pile quality, this paper further explores the relationship between coal pile calorific value loss and changes in ash content and lower calorific value based on the total available lower calorific value. This paper proposes a method for measuring coal pile calorific value loss based on ash content correction. Furthermore, a system is designed to automatically calculate and record coal pile calorific value loss. This solves the technical problem of low calorific value loss measurement accuracy that exists in existing technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 This is a schematic diagram of the steps of a method for measuring calorific value loss in a coal yard based on ash correction according to Example 1 of the present invention;

[0063] Figure 2 This is a structural schematic diagram of a coal yard calorific value loss measurement system based on ash correction according to Example 2 of the present invention. DETAILED DESCRIPTION

[0064] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0065] Example 1

[0066] like Figure 1 As shown, a method for measuring calorific value loss in a coal field based on ash correction of the present invention comprises the following steps:

[0067] S1. When coal is delivered to the factory and piled up, the coal piles are numbered and the ash content and the received basic calorific value of the coal are tested;

[0068] S2. Transmit the incoming coal number, ash content, and lower calorific value to the data recording and processing system;

[0069] S3. When coal is taken from the coal pile, the coal taking device 2 automatically records the coal pile number, and automatically weighs the coal through the weighing device 4 of the coal conveyor belt 3 and transmits the data to the data recording and processing system. At the same time, the automatic uniform sampling device 5 of the coal conveyor belt automatically samples the coal on the belt. The samples are taken to the laboratory 6 for testing of low calorific value and ash content, and the results are input into the data recording and processing system 7.

[0070] S4. After each coal removal from the coal pile is completed, the data recording and processing system automatically calculates the total mass of coal removed from the coal pile and the calorific value loss in real time using the following logic:

[0071] ,

[0072] in Represents the total coal mass after n times of coal removal; in this embodiment, after all the coal in the coal pile is removed, the calorific value loss statistics of the numbered coal pile are completed and the data is automatically saved.

[0073] Example 2

[0074] The present invention takes the coal pile in the coal yard as the research object, takes the total available low calorific value as the basis, and utilizes the characteristic that the total ash mass of the coal pile does not change during the storage process of the coal, so as to use the change of the coal ash content to correct the mass change of the coal pile. Taking into account the total mass change of the coal pile and the calorific value change of the coal sample in the coal pile, a method for calculating the calorific value loss of the coal yard based on the correction of the coal ash content is proposed. Coal ash refers to the residue left after the coal is completely burned. These residues are almost entirely derived from the minerals in the coal. During the coal stacking process, whether the coal pile is undergoing low-temperature oxidation reaction, evaporation, or water spraying to reduce the temperature, the ash content of the coal does not participate in the reaction. That is, without considering dust, the total ash mass of the coal pile does not change and remains a constant. The total ash mass of the coal pile is the product of the total mass of the coal pile and the received basis ash content of the coal pile, which can be used to obtain Formula 1.

[0075] Aar1*M1=Aar2*M2 (1)

[0076] Where: Aar1 - received ash content of coal at the time of entering the factory, %;

[0077] Aar2——As-received ash content of coal fed into the furnace, %;

[0078] M1 - total mass of coal entering the plant, kg;

[0079] M2——Total mass of coal entering the furnace, kg.

[0080] In order to obtain the total mass relationship of the coal pile at different times, equation 2 is obtained based on equation 1.

[0081] X=M2 / M1=Aar1 / Aar2 (2)

[0082] Where X is the coal pile weight coefficient, which is the ratio of the total mass of the coal in the pile to its original mass. It represents the weight change of the coal pile after a certain period of storage. The smaller X, the greater the weight loss of the coal pile. The ash content of the coal pile can be determined through laboratory testing. Using Equation 2, the change in ash content can be used to represent the change in the total mass of the coal pile, solving the problem of the difficulty of directly weighing the total mass of the coal pile.

[0083] For coal-fired power plants, the available heat of coal is the received low calorific value of coal. For incoming coal, it is the total low calorific value of incoming coal. For incoming coal, it is the total calorific value of incoming coal. However, accurate weighing of incoming coal and incoming coal is difficult to achieve. In order to truly reflect the storage process of coal piles, based on the principle that the total mass of ash in the coal pile does not change during storage, a method for calculating the calorific value loss of coal yards based on coal ash content correction is proposed. This method comprehensively considers the changes in the low calorific value of coal and the changes in the total mass of the coal pile during storage, and can more accurately and truly characterize the calorific value loss of coal piles during storage. This paper selects a coal pile as the research object. The total calorific value of the coal pile is the product of the average calorific value of the coal sample and the total mass of the coal pile, that is, formula (3):

[0084] Q=Q a ×M (3)

[0085] Where: Q is the total calorific value of the coal pile, kJ;

[0086] Qa is the lower calorific value of the coal sample in the coal pile, kJ / kg;

[0087] M is the total mass of the coal pile, kg.

[0088] When sampling coal from a coal pile, the principle of uniform sampling is followed, and the calorific value of the coal sample is considered to be the average calorific value of the coal pile. The total low calorific value of the coal pile is the product of the total mass of the coal pile and the low calorific value of the coal sample, that is:

[0089] Q1=Q a1 ×M1

[0090] Q2=Q a2 ×M2 (4)

[0091] Where: Q1 is the total calorific value of coal entering the plant, kJ;

[0092] Qa1 is the lower calorific value of the coal sample entering the plant, kJ / kg;

[0093] Q2 is the total calorific value of coal when it is fed into the furnace, kJ;

[0094] Qa2 is the lower calorific value of the coal sample entering the furnace, kJ / kg.

[0095] Because the calorific value loss of the coal yard includes the weight loss and heat loss of the coal pile, it is more objective to characterize the calorific value loss of the coal pile by the total calorific value of the coal pile. Therefore, combining Equation 4 with Equation 2 yields:

[0096]

[0097] Among them, α is the calorific value loss ratio of the coal pile, that is, the proportion of the calorific value loss of the entire coal pile to the original total calorific value of the coal pile, which is used to characterize the magnitude of the calorific value loss of the coal pile.

[0098] In practice, the same pile of coal may be fed into the boiler multiple times for combustion, and the time of each coal removal is not consistent, so the calorific value loss of each coal removal is different. Therefore, the calorific value loss ratio of the entire coal pile is supplemented by the weight ratio of each calorific value loss, as shown in formula (6).

[0099]

[0100] in Represents the total mass of coal taken after n times of coal removal. Although there are errors in weighing on the weighing belt, the same weighing device is used throughout the coal removal process, and the calculation process uses mass ratio, so the result is relatively accurate.

[0101] like Figure 2 The present invention provides a coal yard calorific value loss measurement system based on ash correction, comprising a coal picking device 2 with a positioning function that can automatically identify the number of coal piles in the coal yard, a coal conveyor belt 3 with a weighing device 4, a uniform sampling device 5, a coal sampling device 6, and a data recording and processing system.

[0102] In summary, the present invention comprehensively considers the changes in the low calorific value of coal and the changes in the total mass of the coal pile during storage, and can more accurately and truly characterize the calorific value loss of the coal pile during storage. The present invention takes the coal pile in the coal yard as the research object, takes the total available low calorific value as the basis, and utilizes the characteristic that the total ash mass of the coal pile does not change during storage, thereby using the change in the ash content of the coal to correct the mass change of the coal pile. It comprehensively considers the total mass change of the coal pile and the calorific value change of the coal sample in the coal pile, and obtains the calorific value loss of the coal yard based on the coal ash content correction, thereby improving the measurement accuracy of the calorific value loss.

[0103] The ash content of the coal pile of the present invention can be obtained through chemical analysis. By utilizing the coal pile weight coefficient and the logic for obtaining related mass parameters, the change in the total mass of the coal pile can be expressed by the change in the ash content, thus solving the problem that the total mass of the coal pile is difficult to weigh directly.

[0104] The present invention truly reflects the coal pile during storage. Based on the principle that the total mass of ash in the coal pile does not change during storage, the calorific value loss of the coal yard is obtained based on the coal ash correction processing. The present invention comprehensively considers the changes in the low calorific value of coal and the total mass changes of the coal pile during storage, and can more accurately and truly characterize the calorific value loss of the coal pile during storage.

[0105] Because the calorific value loss of a coal yard includes both weight loss and heat loss, the present invention uses the total calorific value of the coal pile to more objectively characterize the calorific value loss of the coal pile. This study uses the coal pile in a coal yard as the research object, taking advantage of the fact that the total ash mass of the coal pile does not change during storage. By using the change in coal ash content to correct for changes in the coal pile mass, the present invention can accurately calculate the weight loss of the coal pile during storage.

[0106] After exploring the relationship between ash content and coal pile quality, this paper further explores the relationship between coal pile calorific value loss and changes in ash content and lower calorific value based on the total available lower calorific value. This paper proposes a method for measuring coal pile calorific value loss based on ash content correction. Furthermore, a system is designed to automatically calculate and record coal pile calorific value loss. This solves the technical problem of low calorific value loss measurement accuracy that exists in existing technologies.

[0107] 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 they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for measuring calorific value loss in a coal field based on ash correction, characterized in that: The method comprises: S1. Collect and obtain the ash content data and received low calorific value data of the incoming coal; S1 includes: S11. Pile coal into the factory to obtain not less than 2 coal piles; S12. Number the coal piles; S13, collecting and obtaining ash data of the coal pile and received basic low calorific value data according to the number; S2, transmit the incoming coal number, ash content data and received basic low calorific value data to the data recording and processing system (7); S3. When taking coal from the coal pile, the coal taking device (2) automatically records the coal pile number, and the coal is weighed by the weighing device (4) provided on the coal conveyor belt (3) and the coal quality data is transmitted to the data recording and processing system (7). The automatic uniform sampling device (5) provided on the side of the coal conveyor belt (3) is used to sample and obtain the coal sample. The low calorific value detection data and ash content detection data of the coal sample are tested by the testing unit (6) and transmitted to the data recording and processing system (7). Step S3 also includes: S31, processing the coal quality data and ash content data using a preset multiplication logic to obtain a coal pile mass-ash content relationship; Step S31 includes: S311. Collect and obtain the total mass of the coal pile, the received basis ash content of the coal pile, and the total ash content of the coal pile; S312. Process the total mass of the coal pile, the received basis ash content of the coal pile, and the total mass of the coal pile ash content using the following logic to obtain a mass-ash content relationship of the coal pile: Aar1*M1=Aar2*M2 Where Aar1 represents the received ash content of coal entering the plant, Aar2 represents the received ash content of coal entering the furnace, M1 represents the total mass of coal entering the plant, and M2 represents the total mass of coal entering the furnace. S32. Based on the coal pile mass-ash relationship data, a preset proportional relationship is used to obtain a ratio of the current and original total mass of the coal pile; In step S32, the following logic is used to process the mass-ash relationship of the coal pile to obtain the ratio of the current to the original total mass of the coal pile: X=M2 / M1=Aar1 / Aar2 Where X is the coal pile weight coefficient; S33, processing the average calorific value of the coal sample and the total mass of the coal pile using a preset multiplication logic to obtain the total calorific value of the coal pile, and based on this, obtain the total low calorific value of the coal pile; S34, processing the relationship between the mass and ash content of the coal pile and the total low calorific value of the coal pile using preset logic to obtain low calorific value detection data; S4. Each time coal is taken from the current coal pile, the data recording and processing system (7) is used to process the low calorific value detection data and the ash detection data according to the preset logic to obtain the real-time total mass of the coal taken from the coal pile and the real-time calorific value loss data, and the real-time calorific value loss data is counted and saved.

2. The method for measuring calorific value loss in a coal field based on ash correction according to claim 1, characterized in that: In step S33, the average calorific value of the coal samples and the total mass of the coal pile are processed using the following logic to obtain the total calorific value of the coal pile: Q=Q a ×M, Among them, Q is the total calorific value of the coal pile, Qa is the lower calorific value of the coal sample in the coal pile, and M is the total mass of the coal pile.

3. The method for measuring calorific value loss in a coal field based on ash correction according to claim 1, characterized in that: In step S33, the total mass of the coal pile and the low calorific value of the coal sample are processed by the following logic to obtain the total low calorific value of the coal pile: Q1 = Q a1 ×M1 Q2=Q a2 ×M2, Among them, Q1 is the total calorific value of the coal entering the factory, Qa1 is the low calorific value of the coal sample entering the factory, Q2 is the total calorific value of the coal entering the furnace, kJ, and Qa2 is the low calorific value of the coal sample entering the furnace.

4. The method for measuring calorific value loss in a coal field based on ash correction according to claim 1, characterized in that: In step S34, the mass-ash relationship of the coal pile and the total low-heat value of the coal pile are processed using the following logic to obtain the low-heat value detection data: , Among them, α is the calorific value loss ratio of the coal pile.

5. The method for measuring calorific value loss in a coal field based on ash correction according to claim 1, characterized in that: In step S3, the calorific value of the coal sample is taken as the average calorific value of the coal pile.

6. The method for measuring calorific value loss in a coal field based on ash correction according to claim 1, characterized in that: In step S4, the following logic is used to obtain the real-time total mass of coal removed from the coal pile and the real-time calorific value loss data, and the real-time calorific value loss data is counted and saved: in It represents the total coal mass after n times of coal removal, and α is the calorific value loss ratio of the coal pile.

7. A coal yard calorific value loss measurement system based on ash correction, used to implement the coal yard calorific value loss measurement method based on ash correction according to any one of claims 1 to 6, characterized in that: The system comprises: The collection unit is used to collect the ash content data and received low calorific value data of the coal entering the factory; An incoming coal data transmission unit, used to transmit the incoming coal number, the ash content data and the received basic low calorific value data to a data recording and processing system (7), wherein the incoming coal data transmission unit is connected to the acquisition unit; A low calorific value and ash content detection unit is used to automatically record the coal pile number with a coal taking device (2) when taking coal from a coal pile, weigh the coal through a weighing device (4) provided on a coal conveyor belt (3) and transmit the coal quality data to the data recording and processing system (7), sample the coal sample using an automatic uniform sampling device (5) provided at the side of the coal conveyor belt (3), and test the low calorific value detection data and ash content detection data of the coal sample with a testing unit (6) and transmit the data to the data recording and processing system (7), wherein the low calorific value and ash content detection unit is connected to the incoming coal data transmission unit, and the low calorific value and ash content detection unit further comprises: a mass-ash relationship processing component for processing the coal mass data and the ash data using a preset multiplication logic to obtain a mass-ash relationship of the coal pile; a coal pile mass ratio processing component, configured to process the coal pile mass-ash relationship data using a preset proportional relationship to obtain a ratio of the existing to the original total mass of the coal pile, the coal pile mass ratio processing component being connected to the mass-ash relationship processing component; a total low calorific value processing component, which processes the average calorific value of the coal sample and the total mass of the coal pile using a preset multiplication logic to obtain the total calorific value of the coal pile, and thereby obtains the total low calorific value of the coal pile; the total low calorific value processing component is connected to the coal pile mass ratio processing component; a low calorific value detection component, configured to process the coal pile mass-ash relationship and the total low calorific value of the coal pile using preset logic to obtain low calorific value detection data, wherein the low calorific value detection component is connected to the coal pile mass ratio processing component and the total low calorific value processing component; The data recording and processing system (7) is used to process the low calorific value detection data and the ash detection data according to a preset logic each time coal is taken from the current coal pile, so as to obtain the real-time total mass of the coal taken from the coal pile and the real-time calorific value loss data, and to count and save the real-time calorific value loss data.

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