CN114705588B - Pressure test method for bulk coal bulk density - Google Patents
Pressure test method for bulk coal bulk density Download PDFInfo
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- CN114705588B CN114705588B CN202210361124.7A CN202210361124A CN114705588B CN 114705588 B CN114705588 B CN 114705588B CN 202210361124 A CN202210361124 A CN 202210361124A CN 114705588 B CN114705588 B CN 114705588B
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- 239000003245 coal Substances 0.000 title claims abstract description 247
- 238000010998 test method Methods 0.000 title claims abstract description 7
- 238000012360 testing method Methods 0.000 claims abstract description 94
- 238000003860 storage Methods 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000005070 sampling Methods 0.000 claims abstract description 17
- 238000005303 weighing Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000003825 pressing Methods 0.000 claims description 29
- 230000008859 change Effects 0.000 claims description 14
- 238000002474 experimental method Methods 0.000 claims description 7
- 238000012935 Averaging Methods 0.000 claims description 5
- 238000007790 scraping Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000003203 everyday effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012952 Resampling Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 101100356682 Caenorhabditis elegans rho-1 gene Proteins 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
- G01N2009/022—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume of solids
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Abstract
The invention discloses a pressure test method for bulk coal bulk density, which comprises the following steps: step 1, sampling; step 2, weighing; step 3, taking the maximum pressure; step 4, setting an intermediate value and compiling a pressure interval table; step 5, starting a stress application device; step 6, restarting the boosting device; step 7, constructing a pressure-density interval; step 8, performing a characteristic test on the target coal pile to obtain a storage time-density interval table; step 9, compiling a pressure-storage time-density correspondence table; step 10, repeating the steps 1-9 for different kinds of coals respectively to obtain a plurality of pressure-storage time-density interval tables and data, drawing each bulk density trend chart, and storing the bulk density trend charts into a software database; and 11, density detection operation. According to the invention, through searching a high correlation rule between pressure and storage time which are closely related to the coal pile, the corresponding relation of the coal stacking density is found, and the accurate test of the coal stacking density is improved; the method has the characteristics of simple equipment, simplicity and convenience in operation, high accuracy and low labor cost.
Description
Technical Field
The invention relates to the technical field, in particular to a pressure test method for bulk coal bulk density.
Background
The coal quality stored in the coal yard of the existing coal-fired power plant is calculated according to the formula that the coal quality is equal to the stacking density multiplied by the volume of the coal pile. Coal pile volume detection is carried out in a laser scanning mode in the prior art. The method for detecting the bulk density of coal generally adopts an actual measurement method and an analog method for measurement. The method for testing the small coal bulk density container (MT/T739-2011), the method for testing the large coal bulk density container (MT/T739-2011), the method for testing the small coal bulk density container (MT/T739-2011), the method for testing the large coal bulk density container (PRC) coal industry standard, the method for testing the small coal bulk density container (MT/T740-1997) and the method for testing the coal bulk density container (PRC electric power industry standard, the rules of the disc count of the coal-fired power plant (DL/T1878-2018) are all implemented by adopting the fact that the volume of the coal pile is unchanged, and the bulk density of the coal pile is tested by weight change. The measuring method has low precision, complicated measuring process and considerable time and labor waste.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, change the angle and thought of the prior measurement theory that the bulk density of a coal pile is tested by weight change according to the unchanged volume of the coal pile, and provide a pressure test method of bulk coal bulk density according to the thought of the bulk density of the coal pile by volume change according to the unchanged weight of the coal pile.
The aim of the invention is realized by the following technical scheme:
a pressure test method for bulk coal bulk density comprises the following steps:
Step 1, sampling: sampling a coal sample with coal pile representativeness on a target coal pile according to a coal sampling standard;
step 2, weighing: loading the collected coal sample into a test hopper until the coal sample is higher than the upper surface of the test hopper, scraping the coal of the test hopper, weighing the net weight of the coal sample in the test hopper, and calculating the pressureless density rho 0 according to the volume of the coal in the test hopper;
Step 3, obtaining the maximum pressure through experiments: the coal in the test hopper is pressed by the coal pressing plate, and the pressure of the coal in the test hopper, the volume of which is not changed any more, is used as the maximum pressure value;
Step 4, compiling a pressure-density interval table: dividing the maximum pressure value obtained in the step 3 into N equal pressure intervals, calculating an average pressure F1, obtaining F1, F2 and F3 … … FN from small to large, and arranging the intervals, wherein F2=2×F1, F3=3×F1 … … FN=N×F1;
Step 5, starting a force application device: gradually increasing pressure is applied through the force application device, the coal pressing plate is driven to move downwards until the applied pressure value reaches F1 and the volume of coal is not changed any more; recording the pressure value, the pressing depth, the volume and the first density rho 1 of the test coal at the moment;
Step 6, restarting the force application device: gradually increasing pressure is applied through the force application device, the coal pressing plate is driven to move downwards until the applied pressure value reaches 2F1 and the volume of coal is not changed any more; recording the pressure value, the pressing depth, the volume and the second density rho 2 of the test coal at the moment; and by analogy, obtaining the Nth density rho N of the test coal;
Step 7, constructing a pressure-density interval: under the condition that the weight of coal is unchanged, N different pressures are given to coal in a test hopper, so that N densities are obtained; F0-FN and ρ0- ρN are tabulated to form a pressure interval from unpressurized F0 to maximum pressure FN and corresponding N density intervals;
Step 8, compiling a storage time-density table: carrying out a relation characteristic experiment of coal stacking time and coal stacking density on a coal stack with a certain weight, measuring the stacking density in a fixed time every day until the change of the coal stacking density between the adjacent days of the last 3 days is not more than 0.1% and the coal stack basically reaches balance, obtaining N stacking densities with the density from small to large, and compiling a table of the storage time and the corresponding density;
step 9, compiling a pressure-storage time-density correspondence table: the pressure interval, the density interval and the storage time interval are in one-to-one correspondence, and a table corresponding to the pressure, the storage time and the density is compiled;
Step 10, repeating the steps 1-9 for different kinds of coals to obtain a plurality of tables and data corresponding to pressure-storage time-density, drawing each stacking density trend chart, and storing the stacking density trend charts into a software database;
The table and data obtained from the test in steps 1-10 are preset in the software database in the device of the invention and used for a long time as a tool for specific operation inquiry, and are non-frequent detection items.
Step 11, density detection operation: sampling and weighing the target coal pile, and according to the number of days when the coal pile is piled up, calculating the average density of the target coal pile for a plurality of times by inquiring a programmed pressure-storage time-density corresponding table in a database, and then averaging the calculated average densities to obtain the final stacking density of the target coal pile.
Further, the step 3 specifically includes: the coal sample in the test hopper is scraped and is pressed by the coal pressing plate, the coal pressing plate is provided with a force application device, the pressure is gradually increased by the force application device, the change condition of the coal volume is observed, when the coal volume has no obvious change and the density is balanced, the pressure is stopped increasing, and the pressure value at the moment is measured and is used as the maximum pressure value.
Further, the step 3 further includes: changing coal samples, measuring the maximum pressure value, repeating for 3-5 times, and taking the average value of the measured maximum pressure values as the final maximum pressure value.
Further, the step 11 specifically includes the following substeps:
Step 1101: sampling according to the step 1, weighing in the step 2, checking the number of days when the target coal pile is piled up, taking pressure data of 3-5 days before and after the number of days when the target coal pile is piled up by inquiring a programmed pressure-storage time-density corresponding table in software, sequentially giving corresponding 3-5 pressures to obtain corresponding 3-5 densities, carrying out 1 st average on the 3-5 densities, and calculating the first average density of the target coal pile;
Step 1102: repeating step 1101 3-5 times to obtain 3-5 average bulk densities;
step 1103: and (5) averaging all the obtained average bulk densities again to obtain the final bulk density of the target coal pile.
Further, the step 11 further includes a step of obtaining the weight of the target coal pile, specifically: testing the target coal pile by using a laser checking instrument and obtaining the volume value of the specific target coal pile; this value is calculated with the final average bulk density to yield the weight of the target coal pile.
Further, the test hopper is a square, trapezoid or cylindrical box body, and the coal volume is calculated through the pressing depth of the coal pressing plate of the stay cord sensor.
Further, the step 11 further includes a step of generating a density detection report: the measured, inquired and calculated data are output in the form of detection reports through a software system, the reports are sent through a USB flash disk or remote wireless transmission, and the reports can be printed through a printer.
The invention has the beneficial effects that: the method starts with the pressure (the height of the coal pile) and the storage time which are closely related to the coal pile, finds out the corresponding relation of the coal pile density through the pressure and the storage time, then carries out average calculation for a plurality of times according to the length of the storage time, and carries out average calculation for a second time by resampling for a plurality of times, thereby improving the accurate test of the coal pile density; the invention has the characteristics of simple equipment, simple and convenient operation, high accuracy and low labor cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a schematic structural diagram of a pressure testing device.
FIG. 3 is a flow chart of a stress test for drawing data in a database of preset software.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In this embodiment, as shown in fig. 1, a method for testing bulk coal bulk density comprises:
A1, for the implementation of the scheme, a pressure testing device as shown in FIG. 2 can be manufactured: manufacturing a box device with an applicable pressure; the invention performs the test of the coal stacking density by means of a box device, wherein the test device comprises a pressure device, a box weighing device, a sensor system and a control display system. The pressure device is designed above the pressure device, the pressure is readable and can be subdivided, the pressure interval is divided into a plurality of gears with unequal pressure, and accurate pressure can be applied to coal in the box body; the box body is trapezoid, conical, square and round, wherein the left and right angles of the lower part of the trapezoid are 45-60 degrees, and the upper part of the cone can be a plane. The height of the staff gauge is upwards listed from the minimum value of the bottom surface of the case, and the maximum value of the height value is read out and recorded according to the pressure condition. The sensor system can test the weight of the coal in the box body and can display the numerical value of the height and the volume of the coal after certain pressure in the box body; the control display system is used for controlling the pressure, the volume, the height and the density and displaying the numerical value of the individual. The pressure system can sense the change of the height and the volume in the box body through a hydraulic or pneumatic pressure specific pressure sensor for the coal in the box body.
The box body device A1.1 comprises a 01 frame, a 02 stress application device, a 03 coal pressing plate, a 04 sliding table, a 05 coal feeding hopper, a 06 coal discharging baffle, a 07 coal discharging push plate, a 08 coal weight weighing mechanism, a 09 test hopper (square), a 10 scraping device, a pull rope sensor and the like. An intelligent control system and a display device can be designed outside the box body.
A1.2 functions of the box parts:
A1.2.1 The box body device can be designed and installed on the mobile trailer, so that a user can conveniently move the position at any time to perform a density test on the sample coal at a required position.
A1.2.2 The 02 force applying device, the 03 coal pressing plate, the 05 coal feeding hopper, the 06 coal discharging baffle, the 07 coal discharging pushing plate, the 08 coal weight weighing mechanism, the 09 test hopper, the 10 scraping device and the like are assembled on the 01 frame.
A1.2.3 The 09 test hopper specification and size were made according to the standard MT/T739-2011 coal bulk density cuvette determination method. The 09 test hopper has an openable 06 coal outlet baffle plate and a 07 coal outlet pushing plate for pushing out the tested coal.
A1.2.4 The movement of the mechanism such as the 07 coal outlet pushing plate, the 10 scraping device, the 04 sliding table, the 07 coal outlet pushing plate and the like is pushed by a hydraulic cylinder. The upper end of the force transducer is connected with the lower end of the force applying device and is connected with a 03-pressure coal pressing plate, and the force transducer can timely and accurately measure the test force of the coal for test. The pull rope sensor is responsible for measuring the depth change of the coal in the 09 test hopper under the action of the applied test force.
A1.2.5 a circular or square box body with a certain volume inside (according to the coal industry standard or the electric power industry standard) is manufactured, a scale is arranged outside the box body, the height of the scale is upwards listed with the maximum value of the height value from the minimum value of the bottom surface of the box body, and the height of the coal in the box body can be read and recorded according to the pressure condition.
A1.3A force application device with metering is designed above the A1.1 box body, the pressure is readable and can be subdivided, and the pressure interval is divided into a plurality of gears.
A2, sampling: taking a certain amount of coal samples with coal pile representativeness on a target coal pile according to a coal sampling standard;
A3, weighing: the bubbles of the device of the present invention were placed in equilibrium (i.e., the bubbles were centered). Slowly filling the coal sample adopted in the step A2 into a 05 coal feeding hopper, and filling the coal sample into a 09 test hopper through the 05 coal feeding hopper until the 09 test hopper is full of the coal sample and is higher than the upper surface of the 09 test hopper. The upper surface of the test hopper 09 was scraped with a 10-scraper, and the net weight (Kg) of the coal in the test hopper was automatically weighed with a 08-coal weighing device. From the volume (length×width×height, cm 3) of the 09 test hopper, a first order density ρ0 (Kg/cm 3) was calculated;
A4, obtaining the maximum pressure through experiments (the step is an optional operation item, the operation can not be repeated after the data is obtained for the first time, and the maximum pressure value can also be set according to human experience): the upper edge of a 09 test hopper filled with coal is firstly scraped, the 02 force application device at the upper part of the box body is used for gradually and slowly probing and increasing the pressure, the change condition of the surface volume of the coal is observed, when the volume has no obvious change and the density is basically balanced (the ratio of the next pressure to the last pressure is not more than 0.1%), the pressurizing is stopped, the maximum pressure value is tested, and the method is used as a main basis for determining the pressure value. The coal sample can be exchanged in this way and repeated for 3-5 times to obtain an average maximum pressure. According to the method, the maximum pressure value is obtained and determined experimentally for different coal varieties. As shown in fig. 3, the flow of the stress test is to draw data in a database of preset software.
A5, compiling a pressure-density interval table: the maximum pressure value obtained in step A4 is equally divided into N equal pressure sections (corresponding to the storage time-density sections described below), and the average pressure F1 is calculated to obtain F1, F2 (2×f1), and F3 (3×f1) … … FN from small to large. The pressure intervals are listed. This is the primary basis for determining the pressure value.
A6, starting the 02 force application device. The pressure of the 02 force application device F1 drives the force transducer and the 03 coal pressing plate to move downwards. Until the force value set by the system is reached. The pull rope sensor detects the pressing depth of the coal in real time when the force is applied. At this time, the pressurizing force value, the pressing depth, the volume and the test coal density ρ1 are automatically displayed by the control system.
A7, restarting the 02 force application device. The pressure of the 02 force application device 2F1 drives the force transducer and the 03 coal pressing plate to move downwards. At this time, the pressurizing force value, the pressing depth, the volume and the test coal density ρ 2 are automatically displayed on the control system.
A8, and so on, the pressure of the pressure applying device NF1 can be 02, and the pressure value, the pressing depth, the volume and the test coal density ρN can be automatically displayed on the control system. When the pressure reaches a certain degree, the volume of the coal is not changed remarkably (for example, the density of the coal is not more than 0.1 percent for 2-3 times), or the operation is stopped after the coal in the box body is extruded and rattled (crushing sound generated by extrusion of the coal blocks).
A9, according to the operation, under the condition that the weight of the coal is unchanged, N pressures of the coal in the 09 test hopper are given to obtain N densities. F0-FN and ρ0- ρN are programmed into Table 1 to form an N pressure interval from the unpressurized ρ0 to the heaviest pressure FN, while forming a corresponding N density intervals from small ρ0 to large ρN. The recorded densities are tabulated and plotted again into a curve with coordinates, the abscissa being the density and the ordinate being the pressure.
A10, compiling a storage time-density table: and carrying out a relation characteristic experiment of coal stacking time and coal stacking density on a certain weight of coal stacks, measuring the stacking density in a fixed time every day until the density between the adjacent days of the last 3 days is not more than 0.1% and the coal stacks basically reach balance, obtaining N stacking densities from small to large, and compiling a storage time and corresponding density table to form a coal storage time-density interval (table 2). And (3) carrying out a list on the recorded densities, and drawing a curve with coordinates, wherein the abscissa is the density, and the ordinate is the storage time. Table 2 can also be obtained by collating the results of the tests conducted by others.
A11, compiling a pressure-storage time-density correspondence table: tables 1 and 2 are combined, and the pressure interval, the density interval and the storage time interval are in one-to-one correspondence, so as to compile a pressure-storage time-density correspondence table. The corresponding table is used for a long time as a common tool table for the variety of coal.
A12, respectively carrying out a coal pile storage time characteristic test on coal piles of anthracite, bituminous coal and lignite with known coal quantity, carrying out a volume test on the coal piles each day by using a laser disk coal instrument, and parallel-recording the corresponding relation between the time and the actual measured volume and actual density until the volume of the coal is not changed remarkably (for example, the density of similar 2-3 times is not more than 0.1%), wherein the volume and the density of the coal piles basically tend to be stable, namely stopping the operation. Thus, the coal can be used for a long time by making a plurality of common coal varieties.
A13, for N different coal varieties, according to the data of the N pressure-storage time-density corresponding tables (table 3) obtained in the steps A2 to A12, simultaneously drawing a bulk density trend chart, tabulating the recorded densities, and drawing a curve with coordinates, wherein the abscissa is the density, and the ordinate is the pressure (time). Can be stored in the equipment software as a preset tool for searching and calling when needed. The method is characterized in that a plurality of different types of coal form data are provided in software before the product leaves the factory, and relatively accurate accumulated correction data can be obtained by averaging multiple test data of the same type of coal by utilizing big data in the software after the product is used.
Density detection operation
A14, starting the operation flow of the pressure testing device described in A1.3.
A15, sampling: samples were taken in a defined coal pile according to standard coal sampling methods.
A16 Filling: the samples were filled into the test hopper at a constant speed until the box was completely filled slightly higher and scraped flat.
A17, the clear stored time is: and checking the number of days of time for which the target coal pile is piled up.
A18, calling the table 3 in the software, and taking the pressure data of 3-5 days before and after the stored days.
A19, sequentially applying corresponding 3-5 different pressures to obtain corresponding 3-5 densities.
A20, carrying out 1 st average on the 3-5 densities, and calculating the first average density of the target coal pile.
A21, repeating the operation: sampling again according to the steps A14-A19 and repeating the operation for 3-5 times to obtain the average stacking density of multiple groups of 3-5 coals again;
A22, carrying out final average on the plurality of average densities obtained in the A21, and obtaining a final average bulk density value which is the final bulk density of the target coal pile, wherein the data can be automatically generated through software.
Density detection report
And A23, testing the target coal pile by using a laser checking instrument and obtaining the volume value of the specific target coal pile.
And A24, inputting the value into a control system, and calculating the value and the final average bulk density to obtain the weight of the target coal pile. This data may be automatically generated by software.
A25, embedding a standard density detection report in the software, inputting the volume value of the target coal pile obtained in the A22 into a software control system, and automatically generating a density detection report by the software in combination with the final average stacking density.
A26, the report can be output to the USB flash disk, can be directly connected to a printer for printing, and can be designed to be stored and printed in a remote unlimited transmission mode.
In this embodiment, the test hopper may be weighed using a scale, an electronic scale, a pressure sensor, or the like.
In another embodiment, the pressure method is used for testing the coal bulk density by the following steps, A1, the coal bulk density testing device is transported to the flat ground near the target coal bulk, and the air bubble is positioned at the center. And (5) switching on a power supply, and checking whether each component and a control display system are normal.
A2, taking a certain amount of coal samples with coal pile representativeness on a target coal pile according to related standards;
And A3, slowly filling the coal sample collected in the step A2 into a 05 coal feeding hopper, and filling the coal sample into a 09 test hopper through the 05 coal feeding hopper until the 09 test hopper is full of the coal sample and is higher than the upper surface of the 09 test hopper. The upper surface of the test hopper 09 was scraped with a 10-scraper, and the net weight (Kg) of the coal in the test hopper was automatically weighed with a 08-coal weighing device. From the volume (length×width×height, cm 3) of the 09 test hopper, a first order density ρ0 (Kg/cm 3) was calculated;
a4, checking that the time of piling up the target coal pile is 6 days.
And A5, calling the table 3 in the software, and taking the stored pressure data of the 6 th day corresponding to the 4 th day, the 5 th day, the 6 th day, the 7 th day and the 8 th day, wherein the pressure data are respectively 200 kg, 250 kg, 300 kg, 350 kg and 400 kg.
A6, starting the 02 force application device. 200 kg of pressure is applied to the 02 force applying device, and the force sensor and the 03 coal pressing plate are driven to move downwards. Until the set force value of the system is reached. The pull rope sensor detects the pressing depth of the coal in real time when the force is applied. At this time, the control system automatically displays a pressurizing force value of 200 kg, and the test coal density ρ1 is 0.8863.
A7, restarting the 02 force application device. The pressure of 250 kg is given to the 02 force applying device, and the force sensor and the 03 coal pressing plate are driven to move downwards. At this time, the control system automatically displays a pressurizing value of 250 kg, and the test coal density ρ2 is 0.8965.
A8, and so on, the pressure of the 02 force applying devices 300, 350 and 400 kg can be automatically displayed on the control system, wherein the pressure values are respectively 300, 350 and 400 kg, the density of the test coal is 0.8975, the density of the test coal is 0.8995, and the density of the test coal is 0.8999.
A9 the densities ρ1- ρ5 obtained in the steps A6-A8 are averaged 1 st time: (0.8863+0.8965+0.8975+0.8995+0.8999)/5= 0.8959, and the first average density of the target coal pile is calculated to be 0.8959 t/m.
A10, repeating the operation: sampling again according to the steps A2-A9 and repeating the operation for 3 times, and obtaining the average bulk density of 3 coals again, wherein the average bulk density is 0.8970t/m for the second time, 0.8921t/m for the third time and 0.8988t/m for the fourth time;
A11, the 4 average densities obtained for A9 and a10 were finally averaged: (0.8959+0.8970+0.8921+0.8988)/4= 0.8960, the final average density of the target coal pile was calculated to be 0.8960t/m means.
The final average bulk density value 0.8960t/m is the final bulk density of the target coal pile, and the data can be automatically generated by software and directly displayed from the electronic display screen of the control system.
Density detection report
And A12, testing the target coal pile by using a laser checking instrument and obtaining that the volume value of the specific target coal pile is 55900 cubic meters.
A13, 55900m is input into a control system, and the final average bulk density (0.8960) is calculated, so that the target coal pile weight is 50086.4 tons. The data can be automatically generated by software, and 50086.4 tons are directly displayed in an electronic display screen.
A14, outputting the inventory report of the target coal pile to the USB flash disk, and printing.
And testing the target coal pile by using a laser checking instrument to obtain a specific numerical value. This value is calculated with the final bulk density to yield the weight of the target coal pile.
The invention starts with the pressure (coal pile height) and the storage time which are closely related to the coal pile, finds out the corresponding relation of the coal pile density through the pressure and the storage time, then carries out average calculation for a plurality of times according to the length of the storage time, and carries out average calculation for a second time by resampling for a plurality of times, thereby improving the accurate test of the coal pile density. The invention has the characteristics of simple equipment, simple and convenient operation, high accuracy and low labor cost.
It should be noted that the structures, functions and connection forms herein may be implemented in other manners as well. For example, the embodiments described above are merely illustrative, e.g., multiple components may be combined or integrated with one another; in addition, each functional component in the embodiments herein may be integrated into one functional component, or each functional component may exist alone physically, or two or more functional components may be integrated into one functional component.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (7)
1. The pressure test method for bulk coal bulk density is characterized by comprising the following steps:
Step 1, sampling: sampling a coal sample with coal pile representativeness on a target coal pile according to a coal sampling standard;
Step 2, weighing: loading the collected coal sample into a test hopper until the coal sample is higher than the upper surface of the test hopper, scraping the coal of the test hopper, weighing the net weight of the coal sample in the test hopper, and calculating the pressureless density rho 0 according to the volume of the coal in the test hopper;
step 3, taking the maximum pressure: manually setting or obtaining the maximum pressure value through experiments;
Step 4, setting an intermediate value and compiling a pressure interval table: dividing the maximum pressure value obtained in the step 3 into N equal pressure intervals, calculating an average pressure F1, obtaining F1, F2 and F3 … … FN from small to large, and arranging the intervals, wherein F2=2×F1, F3=3×F1 … … FN=N×F1;
Step 5, starting a force application device: gradually increasing pressure is applied through the force application device, the coal pressing plate is driven to move downwards until the applied pressure value reaches F1 and the volume of coal is not changed any more; and recording the pressure value, the pressing depth, the volume and the first density rho 1 of the test coal at the moment;
Step 6, restarting the force application device: gradually increasing pressure is applied through the force application device, the coal pressing plate is driven to move downwards until the applied pressure value reaches F2 and the volume of coal is not changed any more; and recording the pressure value, the pressing depth, the volume and the second density rho 2 of the test coal at the moment; and by analogy, obtaining the Nth density rho N of the test coal;
Step 7, constructing a pressure-density interval: under the condition that the weight of coal is unchanged, N different pressures are given to coal in a test hopper, so that N densities are obtained; F0-FN and rho 0~ρN are tabulated to form a pressure interval from unpressurized F 0 to maximum pressure FN and corresponding N density intervals;
Step 8, compiling a storage time-density interval table: carrying out a relation characteristic experiment of coal stacking time and coal stacking density on a coal stack with a certain weight, measuring the stacking density in a fixed time every day until the change of the coal stacking density between the adjacent days of the last 3 days is not more than 0.1% and the coal stack basically reaches balance, obtaining N stacking densities with the density from small to large, and compiling a table of the storage time and the corresponding density;
step 9, compiling a pressure-storage time-density correspondence table: the pressure interval, the density interval and the storage time interval are in one-to-one correspondence, and a table corresponding to the pressure, the storage time and the density is compiled;
Step 10, repeating the steps 1-9 for different kinds of coals to obtain a plurality of pressure-storage time-density correspondence tables and data, drawing each stacking density trend chart, and storing the stacking density trend charts in a software database;
Step 11, density detection operation: sampling the target coal pile, weighing the sampled coal sample, inquiring the corresponding pressure according to the time days of the piled up coal pile, calculating the average density of the target coal pile for a plurality of times through repeated operation, and averaging the calculated average densities to obtain the final stacking density of the target coal pile.
2. The method for testing bulk coal bulk density according to claim 1, wherein the maximum pressure value obtained through experiments in the step 3 is specifically: the coal sample in the test hopper is scraped and is pressed by the coal pressing plate, the coal pressing plate is provided with a force application device, the pressure is gradually increased by the force application device, the change condition of the coal volume is observed, when the coal volume has no obvious change and the density is balanced, the pressure is stopped increasing, and the pressure value at the moment is measured and is used as the maximum pressure value.
3. The method for pressure testing bulk coal bulk density according to claim 2, wherein said step 3 further comprises: changing coal samples, measuring the maximum pressure value, repeating for 3-5 times, and taking the average value of the measured maximum pressure values as the final maximum pressure value.
4. The method for pressure testing bulk coal bulk density according to claim 1, wherein said step 11 comprises the following steps:
Step 1101: sampling according to the step 1, weighing in the step 2, checking the number of days when the target coal pile is piled up, taking pressure data of 3-5 days before and after the number of days when the target coal pile is piled up by inquiring a programmed pressure-storage time-density corresponding table in software, sequentially giving corresponding 3-5 pressures to obtain corresponding 3-5 densities, carrying out 1 st average on the 3-5 densities, and calculating the first average density of the target coal pile;
Step 1102: repeating step 1101 3-5 times to obtain 3-5 average bulk densities;
step 1103: and (5) averaging all the obtained average bulk densities again to obtain the final bulk density of the target coal pile.
5. The method for testing bulk coal bulk density according to claim 1, wherein the step 11 further comprises a step of obtaining the weight of the target coal pile, specifically: testing the target coal pile by using a laser checking instrument and obtaining the volume value of the specific target coal pile; this value is calculated with the final average bulk density to yield the weight of the target coal pile.
6. The method for testing bulk coal bulk density according to claim 1, wherein the test hopper is a square, trapezoid or cylindrical box, and the coal volume is calculated by pressing depth of the coal pressing plate through the pull rope sensor.
7. The method for testing bulk coal bulk density according to claim 1, wherein said step 11 further comprises the step of generating a density detection report: the measured, inquired and calculated data are output in the form of detection reports through a software system, the reports are sent through a USB flash disk or remote wireless transmission, and the reports can be printed through a printer.
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