CN114965523A - Coal ash content detection device based on gamma ray - Google Patents
Coal ash content detection device based on gamma ray Download PDFInfo
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- CN114965523A CN114965523A CN202210553114.3A CN202210553114A CN114965523A CN 114965523 A CN114965523 A CN 114965523A CN 202210553114 A CN202210553114 A CN 202210553114A CN 114965523 A CN114965523 A CN 114965523A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
- G01N23/12—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the material being a flowing fluid or a flowing granular solid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/2206—Combination of two or more measurements, at least one measurement being that of secondary emission, e.g. combination of secondary electron [SE] measurement and back-scattered electron [BSE] measurement
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Abstract
The invention provides a coal ash content detection device based on gamma rays, which comprises a coal seam thickness regulating device, a controller, a laser range finder, a gamma ray source, a detector, an amplifier, a multichannel analysis spectrometer and an electric control system, wherein the laser range finder, the gamma ray source, the detector, the amplifier, the multichannel analysis spectrometer and the electric control system are connected with the controller, and the coal ash content detection device belongs to the field of coal industry index detection. When clean coal is conveyed to the belt conveyor, the coal seam thickness regulating and controlling device is responsible for regulating the thickness of the coal seam, and the influence of high-density substances such as steel wires in the belt conveyor belt on the measuring result is reduced. The laser range finder sends the coal seam thickness signal after the adjustment for the controller, and the starting drive of belt conveyor is connected to the controller other end, and when coal seam thickness was lower, the rotational speed of conveyer such as skin was transferred and is reduced. The detector comprises a gamma ray source, a detector, a multichannel analysis spectrometer and an electric control system, and realizes continuous measurement of ash content. The temperature sensor in the source box is used for regulating and controlling the temperature of the source box, the influence of the temperature on the measurement result is reduced, and the accuracy of the measurement result is improved.
Description
Technical Field
The invention relates to the field of coal industry index detection, in particular to a coal ash content detection device based on gamma rays.
Background
Coal ash is an important indicator of coal quality. The current universal detection method is a chemical detection method, but the chemical detection method has relatively large hysteresis and cannot detect on line in real time. With the continuous improvement of modern electronic technology and the continuous popularization of nuclear physics technology, the coal ash content online detection technology becomes feasible. The dual-detector coal ash detector absorbs the advantages of the design principle of the nuclear instrument, and is widely applied to the fields of industry, medicine and the like.
The dual-energy gamma ray online ash content detector is realized by adopting two radioactive sources Am at one end of a belt 241 And Cs 137 The low-energy and medium-energy gamma rays emitted respectively irradiate the coal bed on the belt, the detector arranged at the other end of the belt collects the ray signals after the coal is projected, the absorption efficiency of different substances in the coal to the two rays is different, and the low-energy rays Am can be measured 241 The mass fraction of high-Z element in coal is determined by weakening absorption when the coal is transmitted, and the medium energy gamma ray Cs 137 The method can be used for monitoring the change of the mass and thickness of the coal and realizing the rapid measurement of the ash content.
Application No. 20121203270.3 adopts intermediate energy Cs 137 The gamma rays irradiate the coal samples in the coal bunker, and simultaneously generate 32Kev X rays, so that the resource cost is effectively saved, but the defect is that the thickness of the coal bed can interfere with the detection result. The dual-energy gamma ray online ash content detector using the traditional single detector has the advantages that the middle-energy gamma ray source can interfere with the low-energy gamma ray source, the measurement result is inaccurate, the interference caused by internal factors such as coal composition and the like and external factors such as coal seam thickness, moisture and other contained impurities can be caused, and the larger detection error is caused.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a coal ash content detection device based on gamma rays, which can reduce the influence of interference factors on results in coal ash content detection, thereby improving the efficiency and accuracy of coal ash content detection; the invention provides a coal ash content detection device based on gamma rays, which comprises a coal seam thickness regulating device, a controller (11), a laser range finder (6) connected with the controller, a gamma ray source, a detector, an amplifier, a multichannel analysis spectrometer (14) and an electric control system (22);
the coal seam thickness regulating and controlling device comprises 3 baffles, wherein the baffle 1(1) is positioned on the right side of an adhesive tape of the belt conveyor (4) and is inclined at 45 degrees with the plane of the adhesive tape, coal flow at the edge of the right side of the adhesive tape is regulated to the left side, the baffle 2(2) is positioned on the right side of the adhesive tape of the belt conveyor (4) and is inclined at 45 degrees with the plane of the adhesive tape, coal flow at the edge of the left side of the adhesive tape is regulated to the right side, the baffle 3(3) is inclined at 30 degrees with the adhesive tape, and coal flow in the middle of the adhesive tape is leveled and tidy;
the laser range finder (6) is used for detecting the thickness of the coal seam adjusted by the coal seam thickness adjusting and controlling device and sending a thickness signal to the controller (11);
the gamma ray source comprises a medium-energy gamma ray source Cs 137 (7) And a low energy gamma ray source Am 241 (8) The device is used for emitting gamma rays to the coal seam;
the detector comprises a ray detector A (9) and a ray detector B (10) and is used for collecting characteristic rays emitted by the coal seam and sending ray signals to a multichannel analysis spectrometer (14);
the medium energy gamma ray source Cs 137 (7) Emitting rays to irradiate the coal bed, and receiving characteristic X rays of calcium and iron in the coal sample excited by irradiation of intermediate-energy gamma rays and intermediate-energy gamma rays penetrating through the coal bed by a detector A (9); the low-energy gamma ray source Am 241 (8) Emitting rays to irradiate the coal bed, and receiving low-energy gamma rays penetrating through the coal bed by a ray detector B (10);
the controller (11) is used for receiving a coal seam thickness signal sent by the laser range finder (6) and adjusting the rotating speed of the belt conveyor (4) according to the strength of the signal;
the amplifier is a photomultiplier tube and is used as an intermediary for connecting the output end of the detector with the input end of the multichannel analysis spectrometer (14); the multichannel analysis spectrometer (14) is used for receiving gamma ray signals and X ray signals penetrating through the coal seam;
the electric control machine system (22) is used for analyzing an X-ray absorption peak and a gamma-ray full energy peak.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the apparatus further includes: a radiation source box (15), a heat sink;
the heat dissipation device and the gamma ray source are positioned in the source box (15);
the controller (11) is also used to maintain the source box (15) within a normal range.
In combination with the first aspect, the present embodiments provide a second possible implementation manner of the first aspect, wherein the source box (15) includes a source protection window a (16) and a source protection window B (17);
the medium energy gamma ray source Cs 137 (7) Is positioned in a source protection window A (16), and the low-energy gamma-ray source Am 241 (8) Is positioned in the radiation source protection window B (17);
the radiation source protection window is made of lead and 304 stainless steel, is internally and externally made of double-layer stainless steel, is provided with a side-hung protection door which is convenient to open and close, and is respectively provided with an alignment hole A (18) and an alignment hole B (19);
the medium energy gamma ray source Cs 137 (7) Centered on the central axis of the collimating aperture A (18), a low energy gamma-ray source Am 241 (8) The center of the collimating hole is on the central axis of the collimating hole B (19), the depth of the collimating hole is 7cm, and the diameter of the collimating hole is 1 cm.
With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where the heat dissipation device includes a temperature sensor (20) and a heat dissipation valve (21);
the temperature sensor (20) is used for transmitting the current temperature in the source box (15) to the controller (11);
the heat dissipation valve (21) is a heat dissipation sensing valve, is controlled by the controller (11) in a start-stop state and is responsible for regulating and controlling the temperature of the radiation source box (15);
when the temperature in the radiation source box (15) is higher than a preset temperature value, the temperature sensor (20) sends a signal to the controller (11), and the controller (11) sets the heat dissipation sensing valve to be in a starting state;
when the temperature in the source box (15) is lower than a preset temperature value, the temperature sensor (20) sends a signal to the controller (11), and the controller (11) sets the heat dissipation sensing valve to be in a ready state.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where the electric control machine system (22) includes a power supply (23), an energy signal transmission system (24), a spectrum decomposition system (25), and a display system (26);
the energy signal transmission system (24) is connected with the output end of the multichannel analysis spectrometer (14), processed signals are transmitted to the spectrum resolving system (25), and data processed by the spectrum resolving system (25) are transmitted to the display system (26).
Compared with the prior art, the invention has the beneficial effects that:
1. the thickness of the coal bed on the belt conveyor (4) is adjusted by adopting the coal bed thickness adjusting and controlling device, so that the influence of high-density substances such as steel wires in the belt conveyor belt on the measurement result due to too low thickness of the coal bed is reduced;
2. the invention utilizes the laser range finder (6) and the controller (11) as a flow monitoring device on the belt conveyor (4) to regulate and control the rotating speed of the belt conveyor (4) in time;
3. the method utilizes X rays generated by the excitation of intermediate-energy gamma rays and the content of calcium and iron calculated by utilizing the characteristic X rays of the calcium and iron to compensate the influence of the change of the coal on the measurement result;
4. the medium-energy gamma ray utilized by the method not only serves as a gamma ray excitation source to compensate measurement errors caused by coal seam thickness change, but also serves as an X-ray excitation source;
5. the invention can be applied to the automatic and rapid detection of the coal sample on the clean coal belt conveyor (4), and the installation and the detection can be carried out without a bypass belt;
6. the method is simple and has high executable degree.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a coal ash detection device based on gamma rays according to the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of a thickness control apparatus provided in the present invention;
wherein, 1 is a baffle 1; 2 is a baffle 2; 3 is a baffle 3; 4 is a belt conveyer; 5 is a feeding chute; 6 is a laser range finder; 7 is a medium energy gamma ray source Cs 137 (ii) a 8 is a low-energy gamma ray source Am 241 (ii) a 9 is a ray detector A; a ray detector B is 10; 11 is a controller; 12 is an amplifier A; 13 is an amplifier B; 14 is a multichannel analysis spectrometer; 15 is a source box; 16 is a radiation source protection window A; 17 is a radiation source protection window B; 18 is a collimation hole A; 19 is a collimation hole B; 20 is a temperature sensor; 21 is a heat dissipation valve; 22 is an electric controller system; 23 is a power supply, and 24 is an energy signal transmission system; 25 is a spectrum resolving system; and 26 is a display system.
Detailed Description
As can be seen from FIG. 1, the detection device comprises a coal seam thickness regulating device, a controller (11), a laser range finder (6) connected with the controller, a gamma ray source, a detector, an amplifier, a multichannel analyzer (14) and an electric control system (22).
The concrete structure of the coal seam thickness regulating and controlling device is shown in figure 2, and comprises 3 baffle plates, wherein the baffle plate 1(1) is positioned on the right side of an adhesive tape of a belt conveyor (4), is closest to a blanking chute (5) and is inclined at 45 degrees with the plane of the adhesive tape, coal flow at the edge of the right side of the adhesive tape is regulated to the left side, the baffle plate 2(2) is positioned on the right side of the adhesive tape of the belt conveyor (4) and is inclined at 45 degrees with the plane of the adhesive tape, coal flow at the edge of the left side of the adhesive tape is regulated to the right side, the baffle plate 3(3) is closest to a radioactive source and is installed on the horizontal plane, the coal flow in the middle of the adhesive tape is leveled and tidy, and when cotton impurities pass through the baffle plate 3(3), due to the impact effect of clean coal flow on the baffle plate 3(3), the cotton impurities are washed off and are conveyed to the next process link along with the clean coal flow, and therefore the influence of the impurities on the measurement of an online ash meter is eliminated.
The coal seam after thickness adjustment is recorded to the current coal seam thickness when passing through the laser range finder (6), then the coal seam thickness information is transmitted to the controller (11) connected with the laser range finder (6), the power system of the belt conveyor (4) is connected to one end of the controller (11), and the speed of the rotating wheel of the belt conveyor (4) is adjusted according to the thickness information.
The invention provides a gamma ray source which comprises an upper middle-energy gamma ray source Cs 137 (7) And a lower low energy gamma ray source Am 241 (8) Medium energy gamma ray source Cs 137 (7) Is positioned in a source protection window A (16), and the low-energy gamma-ray source Am 241 (8) Is positioned in the radioactive source protection window B (17).
The radiation source protection window is made of lead and 304 stainless steel, has an inner layer and an outer layer of stainless steel, is provided with a side-hung protection door which is convenient to open and close, and is respectively provided with an alignment hole A (18) and an alignment hole B (19); medium energy gamma ray source Cs 137 (7) Centered on the central axis of the collimating aperture A (18), a low energy gamma-ray source Am 241 (8) The center of the collimating hole is on the central axis of the collimating hole B (19), the depth of the collimating hole is 7cm, and the aperture is 1 cm.
Medium energy gamma ray source Cs 137 (7) Irradiating the coal bed on the belt conveyor (4) through the collimation holes A (18) by a low-energy gamma-ray source Am 241 (8) Irradiating the coal seam on the belt conveyor (4) through the collimation holes B (19).
Temperature sensor (20) conveying is temperature in present source case (15) to controller (11), when the temperature in source case (15) is higher than preset temperature value, temperature sensor (20) send signal to controller (11), controller (11) set up the sensing valve that looses heat into starting condition, when the temperature in source case (15) is less than preset temperature value, temperature sensor (20) send signal to controller (11), controller (11) set up the sensing valve that looses heat into ready condition.
The detector comprises a ray detector A (9) positioned at the upper part and a ray detector B (10) positioned at the lower part, wherein the ray detector A (9) is positioned at the same middle energy gamma ray source Cs 137 (7) The position of the X-ray detector corresponds to that of the coal bed, and the X-ray detector is used for receiving intermediate-energy gamma rays penetrating through the coal bed and characteristic X-rays of calcium and iron in the coal sample excited by the irradiation of the intermediate-energy gamma rays; the position of the ray detector B (10) is the same as that of the low-energy gamma ray source Am 241 (8) For receiving low energy gamma rays penetrating the coal seam.
The output end of the ray detector A (9) is connected with the input end of an amplifier A (12), the output end of the ray detector B (10) is connected with the input end of an amplifier B (13), and the amplifier A (12) and the amplifier B (13) are respectively connected with one input end of a multichannel analysis spectrometer (14).
The input end of the multichannel analysis spectrometer (14) is respectively connected with the amplifier A (12) and the amplifier B (13) and is used for receiving gamma ray signals penetrating through the coal seam and X ray signals of calcium and iron in the coal sample, and the output end of the multichannel analysis spectrometer (14) is connected with the electric control system (22).
The electric control machine system (22) comprises a power supply (23), an energy signal transmission system (24), a spectrum resolving system (25) and a display system (26), wherein the input end of the spectrum resolving system (25) is connected with the output end of the multichannel analysis spectrometer (14), processed data are sent to the display system (26), and the input end of the display system (26) is connected with the output end of the spectrum resolving system (25).
In the specific operation:
and S1, conveying the coal sample from the blanking chute (5) to the belt conveyor (4), adjusting the coal flow at the right edge of the adhesive tape to the left side by the baffle plate 1, adjusting the coal flow at the left edge of the adhesive tape to the right side by the baffle plate 2, leveling and tidying the coal flow in the middle of the adhesive tape by the baffle plate 3, conveying the coal layer thickness measured by the laser range finder (6) to the controller (11), and adjusting the rotating speed of the belt conveyor by the controller (11).
Step S2, a medium energy gamma-ray source Cs 137 (7) Irradiating the coal bed on the belt conveyor through the collimation holes A (18), the low-energy gamma ray source Am 241 (8) The coal bed on the belt conveyor (4) is irradiated through the collimation hole B (19), the ray detector A (9) receives medium-energy gamma rays penetrating through the coal bed and characteristic X rays of calcium and iron in a coal sample excited by irradiation of the medium-energy gamma rays, the ray detector B receives low-energy gamma rays penetrating through the coal bed, and ray signals are respectively sent to the multichannel analysis spectrometer (14) after passing through the amplifier A (12) and the amplifier B (13).
And step S3, the energy signal transmission system (24) is connected with the output end of the multichannel analysis spectrometer (14), processed signals are transmitted to the spectrum resolving system (25), the low-energy gamma is used for detecting the content of high-Z elements in the coal, the medium-energy gamma is used for monitoring the change of the mass and thickness of the coal, the content of calcium and iron detected by X-rays is used for compensating the influence of the change of the coal on the measurement result, and the data processed by the spectrum resolving system (25) is transmitted to the display system (26) to obtain the coal ash value.
In conclusion, the coal ash content detection device based on the gamma rays, which is designed by the invention, detects the ash content of the coal bed by analyzing the change of the dual-energy gamma rays and the X rays, and effectively improves the accuracy of ash measurement. The method is simple, high in executable degree and high in reliability.
Finally, it should be noted that: the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, although the present invention is described in detail with reference to the above-mentioned embodiments, it should be understood by those of ordinary skill in the art; any person skilled in the art can modify the technical solutions described in the foregoing embodiments or replace the technical solutions and means therein within the technical scope of the present disclosure; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (6)
1. The utility model provides a coal ash detection device based on gamma ray, includes coal seam thickness regulation and control device, controller (11) and laser range finder (6) be connected with the controller, gamma ray source, detector, amplifier, multichannel analysis spectrometer (14), electric control machine system (22), its characterized in that:
the coal seam thickness regulating and controlling device is used for regulating the thickness of a coal seam on the belt conveyor (4) and reducing the influence of high-density substances such as steel wires in a belt of the belt conveyor on a measuring result;
the laser range finder (6) is used for detecting the thickness of the coal seam adjusted by the coal seam thickness adjusting and controlling device and sending a thickness signal to the controller (11);
the gamma ray source comprises a medium-energy gamma ray source Cs 137 (7) And a low energy gamma ray source Am 241 (8) The device is used for emitting gamma rays to the coal seam;
the detector comprises a ray detector A (9) and a ray detector B (10) and is used for collecting characteristic rays emitted by the coal seam and sending ray signals to a multichannel analysis spectrometer (14);
the medium energy gamma ray source Cs 137 (7) Emitting rays to irradiate the coal bed, and exciting characteristic X rays of calcium and iron in the coal sample by irradiation of intermediate-energy gamma rays and intermediate-energy gamma rays penetrating through the coal bed to be received by a detector A (9); the low-energy gamma ray source Am 241 (8) Emitting rays to irradiate the coal bed, and receiving low-energy gamma rays penetrating through the coal bed by a ray detector B (10);
the controller (11) is used for receiving a coal seam thickness signal sent by the laser range finder (6) and adjusting the rotating speed of the belt conveyor (4) according to the strength of the signal;
the amplifier is a photomultiplier tube and is used as an intermediary for connecting the output end of the detector with the input end of the multichannel analysis spectrometer (14);
the multichannel analysis spectrometer (14) is used for receiving gamma ray signals and X ray signals penetrating through the coal seam;
the device further comprises: the radiation source box (15), the heat dissipation device and the electric control machine system (22); the heat dissipation device and the gamma ray source are positioned in the source box (15); the electric control machine system (22) is connected with the output end of the multichannel analysis spectrometer (14);
the controller (11) is also used for controlling the starting and stopping of the heat dissipation device and maintaining the temperature in the radiation source box (15) within a normal range.
2. The apparatus of claim 1, the coal seam thickness control means comprising three baffles, wherein:
the baffle 1(1) adjusts coal flow at the right side edge of the adhesive tape to the left side, the baffle 2(2) adjusts coal flow at the left side edge of the adhesive tape to the right side, and the baffle 3(3) levels and tidily adjusts coal flow in the middle of the adhesive tape.
3. The device of claim 1, the source box (15) comprising a source protection window a (16) and a source protection window B (17), the medium-energy gamma-ray source Cs being a source of radiation 137 (7) Is positioned in a source protection window A (16), and the low-energy gamma-ray source Am 241 (8) Is positioned in a radiation source protection window B (17), and is characterized in that:
the radiation source protection window is made of lead and 304 stainless steel, is internally and externally made of double-layer stainless steel, is provided with a side-hung protection door which is convenient to open and close, and is respectively provided with an alignment hole A (18) and an alignment hole B (19);
the medium energy gamma ray source Cs 137 (7) Centered on the central axis of the collimating aperture A (18), a low energy gamma-ray source Am 241 (8) The center of the collimating hole is on the central axis of the collimating hole B (19), the depth of the collimating hole is 7cm, and the diameter of the collimating hole is 1 cm.
4. The device according to claim 1, said heat dissipating means comprising a temperature sensor (20) and a heat dissipating valve (21), characterized in that:
the temperature sensor (20) is used for transmitting the current temperature in the source box (15) to the controller (11);
the starting and stopping states of the heat dissipation valve (21) are controlled by a controller (11).
5. The device according to claim 4, wherein the heat dissipation valve (21) is a heat dissipation sensing valve responsible for regulating the temperature of the source box (15), and is characterized in that:
when the temperature in the radiation source box (15) is higher than a preset temperature value, the temperature sensor (20) sends a signal to the controller (11), and the controller (11) sets the heat dissipation sensing valve to be in a starting state;
when the temperature in the source box (15) is lower than a preset temperature value, the temperature sensor (20) sends a signal to the controller (11), and the controller (11) sets the heat dissipation sensing valve to be in a ready state.
6. The device according to claim 1, the electronic control system (22) comprising a power source (23), an energy signal transmission system (24), a spectrum-resolving system (25), a display system (26), characterized in that:
the energy signal transmission system (24) is connected with the output end of the multichannel analysis spectrometer (14), processed signals are transmitted to the spectrum resolving system (25), and data processed by the spectrum resolving system (25) are transmitted to the display system (26).
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| CN202210553114.3A CN114965523A (en) | 2022-05-20 | 2022-05-20 | Coal ash content detection device based on gamma ray |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117805162A (en) * | 2024-02-28 | 2024-04-02 | 天津美腾科技股份有限公司 | X-ray induced ash content instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117805162A (en) * | 2024-02-28 | 2024-04-02 | 天津美腾科技股份有限公司 | X-ray induced ash content instrument |
| CN117805162B (en) * | 2024-02-28 | 2024-05-28 | 天津美腾科技股份有限公司 | X-ray induced ash content instrument |
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