CN113358175A - Normal-pressure variable-volume coal pile volume measuring device and method for large irregular coal pile - Google Patents
Normal-pressure variable-volume coal pile volume measuring device and method for large irregular coal pile Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 109
- 230000001788 irregular Effects 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims description 11
- 239000003550 marker Substances 0.000 claims abstract description 137
- 238000012360 testing method Methods 0.000 claims abstract description 41
- 238000005259 measurement Methods 0.000 claims abstract description 36
- 239000000523 sample Substances 0.000 claims abstract description 36
- 230000009466 transformation Effects 0.000 claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 239000000779 smoke Substances 0.000 claims abstract description 8
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 238000004458 analytical method Methods 0.000 claims abstract description 3
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000005538 encapsulation Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims 6
- 239000007789 gas Substances 0.000 description 6
- 238000007789 sealing Methods 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000004868 gas analysis Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical group [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000012067 mathematical method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F17/00—Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies
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Abstract
The invention provides a normal-pressure variable-volume coal pile volume measuring device for a large irregular coal pile. It includes a closed perimeter, a top transformation boundary; the periphery of the top transformation boundary is assembled on the closed periphery in a closed mode and is linearly arranged in a moving mode relative to the direction of a vertical plane of the closed periphery; the closed periphery extends upwards in the vertical direction and is arranged in a three-dimensional manner, and the closed periphery is used for coating the irregular coal pile with the volume to be measured; at least one marker input port is disposed on the closed perimeter; a plurality of marker concentration test points are arranged on the inner side of the surface area of the closed periphery; the device also comprises a plurality of groups of marker concentration measuring probes and a smoke gas analyzer; the detection end of the marker concentration measurement probe is inserted into a marker concentration test point contacted with a marker, and the marker concentration at the corresponding position is detected by an external smoke analysis instrument.
Description
Technical Field
The invention relates to the technical field of coal pile volume measurement, in particular to a normal-pressure variable-volume coal pile volume measuring device for a large irregular coal pile, and further provides a corresponding measuring method.
Background
In a coal-fired power plant, the coal storage amount of a coal yard has important influence on fuel balance work, and is more significant for the energy consumption of a unit and the operation work of a power plant. The exact measurement of the amount of coal deposited is therefore critical, where volumetric measurement of the coal pile is a difficult point. Taking a circular closed coal yard as an example, a circular stacker-reclaimer is adopted to stack coal, the center of equipment is taken as the center of a circle to form an annular coal pile, the shape of the coal pile is irregular, and the volume of the coal pile cannot be calculated by a conventional mathematical method. In the prior art, the manual measuring method is complicated and has large errors; obtaining the volume of the coal pile by three-dimensional modeling of the coal pile; the volume of the coal pile is also measured by an infrared laser imaging technology. However, the volume accuracy of the obtained coal pile is poor, the measurement is time-consuming and labor-consuming, and the method cannot be used for accurately measuring the coal storage amount.
Disclosure of Invention
In order to solve the problems, the invention provides a normal-pressure variable-volume coal pile volume measuring device for a large irregular coal pile.
Atmospheric pressure varactor coal pile volume measuring device to large-scale irregular coal pile, its characterized in that: it includes a closed perimeter, a top transformation boundary;
the periphery of the top transformation boundary is assembled on the closed periphery in a closed mode and is linearly arranged in a linear moving mode relative to the direction of a vertical plane of the closed periphery;
the closed periphery extends upwards in the vertical direction and is arranged in a three-dimensional manner, and the closed periphery is used for coating the irregular coal pile with the volume to be measured;
at least one marker input port is disposed on the closed perimeter;
a plurality of marker concentration test points are arranged on the inner side of the surface area of the closed periphery;
the device also comprises a plurality of groups of marker concentration measuring probes and a smoke gas analyzer; the detection end of the marker concentration measurement probe is inserted into a marker concentration test point contacted with a marker, and the marker concentration at the corresponding position is detected by an external smoke analysis instrument.
It is further characterized in that: the marker concentration test point is provided with an encapsulation plug, when the marker concentration test point at the corresponding position is required to be started, the encapsulation plug is opened, and then the detection end of the marker concentration measurement probe is inserted into the marker concentration test point contacted with the marker;
the cross-sectional area corresponding to the inner wall of the closed periphery is a set numerical value, which is convenient for calculating the whole volume;
the closed periphery is a regular-pattern closed periphery, and a central area defined by the closed periphery is larger than an irregular coal pile with a volume to be measured;
the closed perimeter includes, but is not limited to, rectangular, circular, triangular, trapezoidal, oval;
preferably, the closed periphery is circular, which is convenient for manufacturing and cross-sectional area calculation;
the periphery of the top transformation boundary is arranged by being attached to the inner wall of the closed periphery, so that the top transformation boundary is ensured not to leak corresponding markers in the vertical lifting process;
the upper part of the top transformation boundary is externally connected with a vertical lifting driving device, and the vertical lifting driving device is used for driving the top transformation boundary to vertically lift;
the marker is standard gas and has the characteristics of easy diffusion and no chemical reaction with air, and the quantity of the marker filled into the inner cavity is determined by the following requirements: the adjusted marker concentration change value can meet the precision requirement of a flue gas analysis instrument, and the lowest input quantity of the marker meets the requirement of the lowest detection limit by the input marker concentration;
the marker input port is positioned in the upper area of the coal pile, and the incident directions are all arranged in the oblique upward direction;
at least one internal mixing device is also disposed within the cavity region formed by the closed perimeter and the top transition boundary for uniform mixing of the markers within the cavity by air flow.
The normal-pressure variable-volume coal pile volume measurement method for the large irregular coal pile is characterized by comprising the following steps of: enclosing a coal pile inside through a peripheral boundary, arranging a top conversion boundary above the coal pile, selecting a corresponding marker concentration test point, inserting a marker concentration measurement probe, introducing a marker, uniformly mixing the marker in an inner cavity, obtaining an average concentration of the corresponding marker concentration measurement probe, adjusting the top conversion boundary upwards for the first time, obtaining a real-time expansion volume, obtaining the average concentration through the corresponding marker concentration measurement probe again, obtaining a space volume value occupied by the marker, and calculating the volume of the coal pile for the first time through a difference value between the total volume of a containing cavity and the space volume occupied by the marker;
then, corresponding N times of upward boundary adjustment of the top transformation boundary are carried out, the corresponding expansion volume of each time is obtained, then the corresponding marker occupied volume is obtained according to the average concentration difference value of the markers at the previous and subsequent times, and then the coal pile volume of the upward boundary adjustment of the top transformation boundary corresponding to (N-1) times is calculated according to the difference value of the total volume of the cavity before the volume is not expanded for N times and the occupied space volume of the markers;
until the calculated coal pile volume deviation after the (n-1) th adjustment and the nth adjustment is smaller than the allowable deviation delta VcStopping the adjustment by VcnAs a final result.
It is further characterized in that:
which comprises the following steps:
a. setting up a boundary: setting up boundary according to actual shape of coal pile, and calculating volume V of boundary according to size of set up boundary0；
b. Inputting a marker: spraying markers from the input port, and realizing the effect of uniform mixing of the internal flow field through the internal circulation device;
c. testing the test point inserted with the marker concentration measuring probe to obtain the average concentration phi of the marker0；
d. Adjusting the top transformation boundary for the 1 st time, and obtaining a first expansion volume V according to the size of the adjusted boundary1And testing the test point inserted with the marker concentration measuring probe again to obtain the average concentration phi of the marker1。
e. Calculating the volume V of the coal pile obtained by the first adjustmentc1The calculation formula is as follows:
VC1＝V0-Va1
Va1adjusting the volume of the space occupied by the marker before the first time;
f. adjusting the boundary for the 2 nd time, testing the test point inserted with the marker concentration measuring probe again to obtain the average concentration phi of the marker2And calculating the volume V of the coal pile obtained by the second adjustmentc2The calculation formula is as follows:
VC2＝V01-Va2
Va2adjusting the volume of the space occupied by the marker before the second time;
g. after the adjustment of 3, 4, 5. n, V obtained by the adjustment of n is calculatedcn(ii) a The number of adjustments is determined by the change in the concentration of the marker, and Δ V is establishedc，△VcThe allowable deviation DeltaV of the coal pile volume after the (n-1) th adjustment and the nth adjustmentc(ii) a (ii) a When the calculated coal pile volume deviation after the (n-1) th adjustment and the nth adjustment is smaller than the allowable deviation delta VcStopping the adjustment by VcnAs a final result.
It is further characterized in that:
△Vcis 0.001% Vcn～0.015％Vcn。
After the device is adopted, the coal pile is enclosed inside through the peripheral boundary, the top conversion boundary is arranged above the coal pile, the corresponding marker concentration test point is selected and inserted into the marker concentration measuring probe, then the marker is introduced, so that the marker is uniformly mixed in the inner cavity, then the average concentration is obtained by the corresponding marker concentration measuring probe, the top conversion boundary is adjusted to be expanded upwards for the first time, the real-time expansion volume is obtained, the average concentration is obtained by the corresponding marker concentration measuring probe again, the space volume value occupied by the marker is obtained, and then the coal pile volume is calculated for the first time through the difference value between the total volume of the cavity and the space volume occupied by the marker; then, corresponding N times of upward boundary adjustment of the top transformation boundary are carried out, the corresponding expansion volume of each time is obtained, then the corresponding marker occupied volume is obtained according to the average concentration difference value of the markers at the previous and subsequent times, and then the coal pile volume of the upward boundary adjustment of the top transformation boundary corresponding to (N-1) times is calculated according to the difference value of the total volume of the cavity before the volume is not expanded for N times and the occupied space volume of the markers; until after the (n-1) th adjustment and the n thThe calculated coal pile volume deviation after secondary adjustment is smaller than the allowable deviation delta VcStopping the adjustment by VcnAs a final result, the irregular coal pile does not need to be leveled, the target result is calculated by multiple iterations, the accuracy of the measurement result is improved, the input quantity of a marker does not need to be measured, and the influence variable is reduced; the volume measurement is carried out on the large irregular coal pile by a variable volume method, the measurement accuracy is high, the measurement is time-saving and labor-saving, and the large-scale popularization and use are facilitated.
Drawings
FIG. 1 is a schematic structural diagram of a measuring device according to the present invention;
FIG. 2 is a plot of the volume of the various regions of the invention as measured;
the names corresponding to the sequence numbers in the figure are as follows:
the device comprises a closed periphery 1, a top transformation boundary 2, a coal pile 3, a marker concentration test point 4, a marker concentration measurement probe 5, a flue gas analysis instrument 6, a vertical lifting driving device 7, a marker input port 8, an internal mixing device 9 and a reference surface 10.
Detailed Description
The volume measuring device of the normal pressure variable volume coal pile aiming at the large irregular coal pile is shown in the figure 1 and the figure 2: it comprises a closed perimeter 1, a top transformation boundary 2;
the periphery of the top transformation boundary 2 is assembled on the closed periphery 1 in a closed manner and is linearly arranged in a linear movement manner relative to the vertical plane direction of the closed periphery; when the device is specifically implemented, the periphery of the boundary which must be changed is provided with the magnetic flexible sealing device, the periphery of the corresponding height position of the closed periphery is provided with the other magnetic flexible sealing device, and the two groups of magnetic flexible sealing devices are mutually adsorbed to form flexible sealing, so that gas does not flow out or external gas does not enter during volume change;
the closed periphery 1 extends upwards in the vertical direction and is arranged in a three-dimensional manner, and the closed periphery 1 is used for coating an irregular coal pile 3 with a volume to be measured;
in specific implementation, the closed periphery 1 is provided with two marker input ports 8;
a plurality of marker concentration test points 4 are arranged on the inner side of the surface area of the closed periphery 1; the device also comprises a plurality of groups of marker concentration measuring probes 5 and a smoke gas analyzer 6; the detection end of the marker concentration measuring probe 5 is inserted into the marker concentration test point 4 contacted with the marker, and the marker concentration at the corresponding position is detected by an external smoke analyzer 6. During specific implementation, the data output end of the flue gas analyzer 6 is directly connected to an external computer, and the external computer collects and calculates the average value of the data quickly; the marker concentration test point 4 is provided with an encapsulation plug (not shown in the figure, the magnetic flexible sealing device with a top transformation boundary is ensured to be lifted smoothly), when the marker concentration test point 4 at the corresponding position is required to be opened, the encapsulation plug is opened, and then the detection end of the marker concentration measurement probe 5 is inserted into the marker concentration test point 4 contacted with the marker;
the cross-sectional area corresponding to the inner wall of the closed periphery 1 is a set numerical value, which is convenient for calculating the whole volume;
the closed periphery 1 is a regular-pattern closed periphery, and a central area surrounded by the closed periphery 1 is larger than an irregular coal pile 3 with a volume to be measured;
in the specific embodiment, the closed periphery 1 is circular, which is convenient for manufacturing and calculating the cross-sectional area;
the upper part of the top transformation boundary 2 is externally connected with a vertical lifting driving device 7, and the vertical lifting driving device 7 is used for driving the top transformation boundary 2 to vertically lift;
the marker is standard gas and has the characteristics of easy diffusion and no chemical reaction with air, preferably, the marker is inert gas, and in specific implementation, the marker is argon; the amount of marker that fills the lumen is determined by the following requirements: the adjusted marker concentration change value can meet the precision requirement of a flue gas analysis instrument, and the lowest input quantity of the marker meets the requirement of the lowest detection limit by the input marker concentration;
the marker input port 8 is positioned in the upper area of the coal pile, and the incident directions are all arranged in the oblique upward direction;
also arranged in the region of the inner cavity formed by the closed perimeter 1 and the top transformation boundary 2 is at least one internal mixing device 9, the internal mixing device 9 being used for the homogeneous mixing of the markers in the inner cavity, which is carried out by the air flow. Reference numeral 10 denotes a reference surface, typically the ground.
The volume measurement method of the normal-pressure variable-volume coal pile for the large irregular coal pile is shown in the figure 1 and the figure 2: enclosing a coal pile 3 in the coal pile through a peripheral boundary 1, arranging a top conversion boundary 2 above the coal pile 3, selecting a corresponding marker concentration test point 4 to insert a marker concentration measurement probe 5, then introducing a marker to uniformly mix the marker in an inner cavity, then obtaining an average concentration by the corresponding marker concentration measurement probe 5, then adjusting the top conversion boundary 2 to be expanded upwards for the first time and obtaining a real-time expansion volume, obtaining the average concentration by the corresponding marker concentration measurement probe 5 again, then obtaining a space volume value occupied by the marker, and then primarily calculating the volume of the coal pile through a difference value between the total volume of a containing cavity and the space volume occupied by the marker;
then, corresponding N times of upward boundary adjustment of the top transformation boundary are carried out, the corresponding expansion volume of each time is obtained, then the corresponding marker occupied volume is obtained according to the average concentration difference value of the markers at the previous and subsequent times, and then the coal pile volume of the upward boundary adjustment of the top transformation boundary corresponding to (N-1) times is calculated according to the difference value of the total volume of the cavity before the volume is not expanded for N times and the occupied space volume of the markers;
until the calculated coal pile volume deviation after the (n-1) th adjustment and the nth adjustment is smaller than the allowable deviation delta VcStopping the adjustment by VcnAs a final result.
Which comprises the following steps:
a. setting up a boundary: setting up boundary according to actual shape of coal pile, wherein in concrete implementation, the closed periphery is in circular structure, and calculating volume V of boundary according to size of set up boundary0；
b. Inputting a marker: spraying markers from the input port, and realizing the effect of uniform mixing of the internal flow field through the internal circulation device;
c. testing the test point inserted with the marker concentration measuring probe to obtain the average concentration phi of the marker0；
d. Adjusting the top transformation boundary for the 1 st time, and obtaining a first expansion volume V according to the size of the adjusted boundary1And testing the test point inserted with the marker concentration measuring probe again to obtain the average concentration phi of the marker1。
e. Calculating the volume V of the coal pile obtained by the first adjustmentc1The calculation formula is as follows:
VC1＝V0-Va1
Va1adjusting the volume of the space occupied by the marker before the first time;
f. adjusting the boundary for the 2 nd time, testing the test point inserted with the marker concentration measuring probe again to obtain the average concentration phi of the marker2And calculating the volume V of the coal pile obtained by the second adjustmentc2The calculation formula is as follows:
VC2＝V01-Va2
Va2adjusting the volume of the space occupied by the marker before the second time;
g. after the adjustment of 3, 4, 5. n, V obtained by the adjustment of n is calculatedcn(ii) a The number of adjustments is determined by the change in the concentration of the marker, and Δ V is establishedc，△VcThe allowable deviation DeltaV of the coal pile volume after the (n-1) th adjustment and the nth adjustmentc；，△VcIs 0.01% Vcn(ii) a When the calculated coal pile volume deviation after the (n-1) th adjustment and the nth adjustment is smaller than the allowable deviation delta VcStopping the adjustment by VcnAs a final result.
In FIG. 2, English shorthand Chinese translates as follows
Vc: volume of coal pile
V0: total volume of coal pile and air at initial boundary
Va: volume of air under initial boundary
V1: the cavity expands the volume for the first time after the 1 st adjustment of the boundary.
The working principle is as follows: enclosing a coal pile inside through a peripheral boundary, arranging a top conversion boundary above the coal pile, selecting a corresponding marker concentration test point, inserting a marker concentration measurement probe, introducing a marker, uniformly mixing the marker in an inner cavity, obtaining an average concentration of the corresponding marker concentration measurement probe, adjusting the top conversion boundary upwards for the first time, obtaining a real-time expansion volume, obtaining the average concentration through the corresponding marker concentration measurement probe again, obtaining a space volume value occupied by the marker, and calculating the volume of the coal pile for the first time through a difference value between the total volume of a containing cavity and the space volume occupied by the marker; then, corresponding N times of upward boundary adjustment of the top transformation boundary are carried out, the corresponding expansion volume of each time is obtained, then the corresponding marker occupied volume is obtained according to the average concentration difference value of the markers at the previous and subsequent times, and then the coal pile volume of the upward boundary adjustment of the top transformation boundary corresponding to (N-1) times is calculated according to the difference value of the total volume of the cavity before the volume is not expanded for N times and the occupied space volume of the markers; until the calculated coal pile volume deviation after the (n-1) th adjustment and the nth adjustment is smaller than the allowable deviation delta VcStopping the adjustment by VcnAs a final result, the irregular coal pile does not need to be leveled, the target result is calculated by multiple iterations, the accuracy of the measurement result is improved, the input quantity of a marker does not need to be measured, and the influence variable is reduced; the volume measurement is carried out on the large irregular coal pile by a variable volume method, the measurement accuracy is high, the measurement is time-saving and labor-saving, and the large-scale popularization and use are facilitated.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. Atmospheric pressure varactor coal pile volume measuring device to large-scale irregular coal pile, its characterized in that: it includes a closed perimeter, a top transformation boundary;
the periphery of the top transformation boundary is assembled on the closed periphery in a closed mode and is linearly arranged in a linear moving mode relative to the direction of a vertical plane of the closed periphery;
the closed periphery extends upwards in the vertical direction and is arranged in a three-dimensional manner, and the closed periphery is used for coating the irregular coal pile with the volume to be measured;
at least one marker input port is disposed on the closed perimeter;
a plurality of marker concentration test points are arranged on the inner side of the surface area of the closed periphery;
the device also comprises a plurality of groups of marker concentration measuring probes and a smoke gas analyzer; the detection end of the marker concentration measurement probe is inserted into a marker concentration test point contacted with a marker, and the marker concentration at the corresponding position is detected by an external smoke analysis instrument.
2. The atmospheric-pressure positive-displacement coal pile volume measurement device for the large-scale irregular coal pile of claim 1, wherein: and the marker concentration test point is provided with an encapsulation plug, when the marker concentration test point at the corresponding position is required to be started, the encapsulation plug is opened, and then the detection end of the marker concentration measurement probe is inserted into the marker concentration test point contacted with the marker.
3. The atmospheric-pressure positive-displacement coal pile volume measurement device for the large-scale irregular coal pile of claim 1, wherein: the cross-sectional area corresponding to the inner wall of the closed periphery is a set numerical value.
4. A normal pressure positive displacement coal pile volume measuring device for a large irregular coal pile as claimed in claim 3, wherein: the closed periphery is a regular-pattern closed periphery, and a central area defined by the closed periphery is larger than an irregular coal pile with a volume to be measured.
5. The atmospheric-pressure positive-displacement coal pile volume measurement device for the large-scale irregular coal pile of claim 4, wherein: the periphery of the top transformation boundary is arranged in a manner of being attached to the inner wall of the closed periphery.
6. The atmospheric-pressure positive-displacement coal pile volume measurement device for the large-scale irregular coal pile of claim 1, wherein: and the upper part of the top transformation boundary is externally connected with a vertical lifting driving device, and the vertical lifting driving device is used for driving the top transformation boundary to vertically lift.
7. The atmospheric-pressure positive-displacement coal pile volume measurement device for the large-scale irregular coal pile of claim 1, wherein: at least one internal mixing device is also disposed within the cavity region formed by the closed perimeter and the top transition boundary for uniform mixing of the markers within the cavity by air flow.
8. The normal-pressure variable-volume coal pile volume measurement method for the large irregular coal pile is characterized by comprising the following steps of: enclosing a coal pile inside through a peripheral boundary, arranging a top conversion boundary above the coal pile, selecting a corresponding marker concentration test point, inserting a marker concentration measurement probe, introducing a marker, uniformly mixing the marker in an inner cavity, obtaining an average concentration of the corresponding marker concentration measurement probe, adjusting the top conversion boundary upwards for the first time, obtaining a real-time expansion volume, obtaining the average concentration through the corresponding marker concentration measurement probe again, obtaining a space volume value occupied by the marker, and calculating the volume of the coal pile for the first time through a difference value between the total volume of a containing cavity and the space volume occupied by the marker;
then, corresponding N times of upward boundary adjustment of the top transformation boundary are carried out, the corresponding expansion volume of each time is obtained, then the corresponding marker occupied volume is obtained according to the average concentration difference value of the markers at the previous and subsequent times, and then the coal pile volume of the upward boundary adjustment of the top transformation boundary corresponding to (N-1) times is calculated according to the difference value of the total volume of the cavity before the volume is not expanded for N times and the occupied space volume of the markers;
until the calculated coal pile volume deviation after the (n-1) th adjustment and the nth adjustment is smaller than the allowable deviation delta VcStopping the adjustment by VcnAs a final result.
9. The method for measuring the volume of the large irregular coal pile by the constant pressure and the variable volume coal pile according to claim 8, which comprises the following steps:
a. setting up a boundary: setting up boundary according to actual shape of coal pile, and calculating volume V of boundary according to size of set up boundary0；
b. Inputting a marker: spraying markers from the input port, and realizing the effect of uniform mixing of the internal flow field through the internal circulation device;
c. testing the test point inserted with the marker concentration measuring probe to obtain the average concentration phi of the marker0；
d. Adjusting the top transformation boundary for the 1 st time, and obtaining a first expansion volume V according to the size of the adjusted boundary1And testing the test point inserted with the marker concentration measuring probe again to obtain the average concentration phi of the marker1。
e. Calculating the volume V of the coal pile obtained by the first adjustmentc1The calculation formula is as follows:
VC1＝V0-Va1
Va1adjusting the volume of the space occupied by the marker before the first time;
f. adjusting the boundary for the 2 nd time, testing the test point inserted with the marker concentration measuring probe again to obtain the average concentration phi of the marker2And calculating the volume V of the coal pile obtained by the second adjustmentc2The calculation formula is as follows:
VC2＝V01-Va2
Va2adjusting the volume of the space occupied by the marker before the second time;
g. after the adjustment of 3, 4, 5. n, V obtained by the adjustment of n is calculatedcn(ii) a The number of adjustments is determined by the change in the concentration of the marker, and Δ V is establishedc，△Vc isAllowable deviation DeltaV of coal pile volume after (n-1) th adjustment and after nth adjustmentc(ii) a (ii) a When the calculated coal pile volume deviation after the (n-1) th adjustment and the nth adjustment is smaller than the allowable deviation delta VcStopping the adjustment by VcnAs a final result.
10. The method for measuring the volume of the large irregular coal pile by using the constant pressure and the variable volume as claimed in claim 9, wherein the method comprises the following steps: delta VcIs 0.001% Vcn～0.015％Vcn。
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| CN114088156A (en) * | 2021-11-18 | 2022-02-25 | 中国矿业大学(北京) | Underground reservoir storage capacity determination method based on gas-liquid diffusion concentration |
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