CN114543456A - Nondestructive drying device and drying method based on coal rock mass ultrasonic monitoring - Google Patents
Nondestructive drying device and drying method based on coal rock mass ultrasonic monitoring Download PDFInfo
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- CN114543456A CN114543456A CN202210066384.1A CN202210066384A CN114543456A CN 114543456 A CN114543456 A CN 114543456A CN 202210066384 A CN202210066384 A CN 202210066384A CN 114543456 A CN114543456 A CN 114543456A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
- F26B25/225—Controlling the drying process in dependence on liquid content of solid materials or objects by repeated or continuous weighing of the material or a sample thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/04—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour circulating over or surrounding the materials or objects to be dried
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a nondestructive drying device and a drying method based on coal rock mass ultrasonic monitoring, which belong to the field of rock mechanics tests and comprise a drying device heat insulation sealing box, a drying device temperature control module, a monitoring display screen, an ultrasonic monitoring control module, an air drainage valve and a heating module, wherein the heating module and the air drainage valve are respectively connected with the drying device temperature control module; the coal rock sample can be dried without damage and completely, so that the accuracy and the scientificity of the mechanical experiment and the physical mechanical parameter test of the coal rock sample in a laboratory are improved; on one hand, the initial wave velocity test is carried out on the coal rock sample, and after the proper drying temperature and drying mode are selected, the optimal scheme is selected for the initial drying of the coal rock sample; on the other hand, the real-time wave velocity and quality test of the drying process of the coal rock sample are beneficial to realizing dynamic drying of the sample, and once the ultrasonic monitoring signal is abnormal in large fluctuation, the nondestructive drying can be realized by reducing the drying temperature or changing the drying mode.
Description
Technical Field
The invention belongs to the field of rock mechanical tests, and relates to a nondestructive drying device and a drying method based on coal rock mass ultrasonic monitoring.
Background
The coal rock sample is required to be dried before various rock mechanical experiments and physical mechanical parameter tests, the existing relevant national standards also recommend the drying temperature and method, but due to the material complexity of the coal rock body such as porosity, heterogeneity, anisotropy and the like, the sample is dried at a single temperature, certain mechanical damage is often generated to the internal structure of the coal rock body, and meanwhile, the contradictory requirement of drying damage and complete drying also influences the accuracy and the scientificity of the mechanical tests and the physical mechanical parameter tests.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a nondestructive drying device based on ultrasonic monitoring of coal-rock mass, aiming at the defects of the prior art, and the nondestructive drying device based on ultrasonic monitoring of coal-rock mass is to solve the technical problem, the present invention provides the following technical scheme: a nondestructive drying device based on ultrasonic monitoring of a coal rock mass comprises a drying device heat insulation seal box, a drying device temperature control module, a monitoring display screen, an ultrasonic monitoring control module, an air pumping valve and a heating module, wherein the heating module and the air pumping valve are respectively connected with the drying device temperature control module;
the air drainage valve is installed on the drying device heat-insulating seal box, the heating module is installed on the inner wall of the drying device heat-insulating seal box, a coal rock sample to be dried is placed in the drying device heat-insulating seal box, an ultrasonic detection device is arranged on the side face of the coal rock sample, a quality monitoring balance is arranged below the drying device heat-insulating seal box, the ultrasonic detection device is connected with the ultrasonic monitoring control module, and the ultrasonic monitoring control module and the quality monitoring balance are respectively connected with the monitoring display screen.
Preferably, ultrasonic detection device includes ultrasonic monitoring transmitter and ultrasonic monitoring receiver, ultrasonic monitoring transmitter and ultrasonic monitoring receiver symmetry set up the both sides at the coal petrography sample, ultrasonic monitoring transmitter passes through the ultrasonic monitoring signal output line and is connected with ultrasonic monitoring control module, ultrasonic monitoring receiver passes through the ultrasonic monitoring signal input line and is connected with ultrasonic monitoring control module.
Preferably, the ultrasonic detection device is adhered to the center of the side face of the coal rock sample through a high-temperature-resistant coupling agent.
Preferably, the sampling rate of the ultrasonic monitoring control module is set to 0.1us, and the measurement precision of the mass monitoring balance is 0.01 g.
Preferably, the monitoring display screen comprises an ultrasonic monitoring display screen and a quality monitoring display screen.
Preferably, the temperature adjusting range of the drying device temperature control module is 30-300 ℃.
Preferably, the quality monitoring balance comprises a main testing balance and an auxiliary testing balance, and the main testing balance and the auxiliary testing balance are respectively arranged at two ends below the heat-insulating sealing box of the drying device.
Preferably, the coal rock sample is GB/T23561.4-2009 coal and a rule sample in national standards of rock physical and mechanical property determination methods.
The drying method based on the nondestructive drying device comprises the following steps:
s1: fixing a coal rock sample to be dried in a drying device heat insulation sealing box, arranging an ultrasonic detection device on the side surface of the coal rock sample, and arranging a quality monitoring balance below the drying device heat insulation sealing box;
s: opening an ultrasonic monitoring control module, carrying out initial ultrasonic signal monitoring on the coal rock sample, and adjusting an air suction and discharge valve through a drying device master control module to select a hot air drying mode or a vacuum hot drying mode according to the longitudinal wave velocity detection results of different coal rock masses; selecting a drying temperature, and controlling a heating module to heat and dry the coal rock sample through a drying device temperature control module;
the hot air drying mode is that the air exhaust valve is in a bidirectional air flowing state, and the air outside the heat-insulating sealed box of the drying device is continuously sucked into the heat-insulating sealed box of the drying device and is heated and dried;
the vacuum heat drying mode is in a one-way air flow state, the interior of the heat-insulating sealed box of the drying device is vacuumized to start heating and drying, and the vacuum is maintained until the drying is finished;
when the coal rock sample is sandstone: the detection result of the longitudinal wave velocity is 4000m/s, a hot air drying mode is selected, and the drying temperature is selected to be 105-; the detection result of the longitudinal wave velocity is less than 4000m/s, a vacuum heat drying mode is selected, and the drying temperature is selected from 105-;
when the coal rock sample is mudstone or shale: the detection result of the longitudinal wave velocity is 3200-3500m/s, the hot air drying mode is selected, and the drying temperature is selected from 105-110 ℃;
when the coal rock sample is coal: selecting a hot air drying mode and a drying temperature of 105-; the detection result of the longitudinal wave velocity is 1500-2000m/s, a vacuum heat drying mode is selected, and the drying temperature is 105-110 ℃; the detection result of the longitudinal wave velocity is less than 1500m/s, a vacuum heat drying mode is selected, and the drying temperature is selected to be 80-105 ℃;
s3: the ultrasonic monitoring control module performs real-time detection to display data on a monitoring display screen, and the mass monitoring balance performs real-time detection to display data on the monitoring display screen;
s4: when the monitoring display screen displays that the cumulative sudden change of the wave speed monitored by the ultrasonic wave exceeds 10 percent or the detection waveform is distorted, changing the drying mode or reducing the drying temperature and prolonging the drying time;
when the monitoring display screen shows that the quality attenuation is less than 1g/h, the drying temperature is reduced by 10 ℃ to continue drying,
when the display quality attenuation of the monitoring display screen is less than 0.1g/h, the drying temperature is reduced by 10 ℃ to continue drying,
and when the display quality attenuation of the monitoring display screen is less than 0.01g/h, stopping drying.
Has the advantages that: the nondestructive drying device based on the coal-rock mass ultrasonic monitoring can realize nondestructive and complete drying of the coal-rock sample, so that the accuracy and the scientificity of the mechanical experiment and the physical mechanical parameter test of the coal-rock sample in a laboratory are improved; on one hand, the initial wave velocity test is carried out on the coal rock sample, and after the proper drying temperature and drying mode are selected, the optimal scheme is selected for the initial drying of the coal rock sample; on the other hand, the real-time wave velocity and quality test of the drying process of the coal rock sample are beneficial to realizing dynamic drying of the sample, and once the ultrasonic monitoring signal is abnormal in large fluctuation, the nondestructive drying can be realized by reducing the drying temperature or changing the drying mode.
Drawings
FIG. 1 is a schematic view of the present apparatus;
FIG. 2 is a top view of the internal structure of the heat-insulating sealing box of the drying device;
the symbols in the drawings illustrate that: 1: the drying device is a heat insulation sealing box; 2: a drying device temperature control module; 3: monitoring a display screen; 4: an ultrasonic monitoring control module; 5: an air bleed valve; 6: an ultrasonic detection device; 7: a coal rock sample; 8: a mass monitoring balance; 9: a heating module; 301: an ultrasonic monitoring display screen; 302: a quality monitoring display screen; 601: an ultrasonic monitoring transmitter; 602: an ultrasonic monitoring receiver; 603: an ultrasonic monitoring signal output line; 604: an ultrasonic monitoring signal input line; 801: a primary test balance; 802: and (4) auxiliary testing of the balance.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
Example 1:
referring to fig. 1-2, the invention provides a technical scheme of a nondestructive drying device based on ultrasonic monitoring of a coal rock mass, which comprises a drying device heat insulation seal box 1, a drying device temperature control module 2, a monitoring display screen 3, an ultrasonic monitoring control module 4, an air suction valve 5 and a heating module 9, wherein the heating module 9 and the air suction valve 5 are respectively connected with the drying device temperature control module 2;
the air pumping and discharging valve 5 is installed on the drying device heat insulation sealing box 1, the heating module 9 is installed on the inner wall of the drying device heat insulation sealing box 1, a coal rock sample 7 to be dried is placed in the drying device heat insulation sealing box 1, and the ultrasonic detection device 6 is arranged on the side face of the coal rock sample 7 and used for monitoring the axial and radial damage conditions in the drying process in real time; a mass monitoring balance 8 is arranged below the heat-insulating seal box 1 of the drying device, the ultrasonic detection device 6 is connected with the ultrasonic monitoring control module 4, and the ultrasonic monitoring control module 4 continuously transmits ultrasonic monitoring signals to the coal rock sample 7 in the drying process through the ultrasonic detection device 6, receives the ultrasonic monitoring signals through the ultrasonic detection device 6, feeds the ultrasonic monitoring signals back to the ultrasonic monitoring control module 4 and displays the ultrasonic monitoring signals on the monitoring display screen 3; the ultrasonic monitoring control module 4 and the quality monitoring balance 8 are respectively connected with the monitoring display screen 3, the drying device temperature control module 2 is used for controlling the heating temperature of the heating module 9 and the air flowing state of the air pumping and discharging valve 5, the quality monitoring balance 8 is used for detecting the quality of the heat insulation sealing box 1 of the drying device, and then the quality attenuation quantity and the attenuation speed of the coal rock sample 7 are obtained through testing and displayed on the monitoring display screen 3;
further, the ultrasonic detection device 6 includes an ultrasonic monitoring transmitter 601 and an ultrasonic monitoring receiver 602, the ultrasonic monitoring transmitter 601 and the ultrasonic monitoring receiver 602 are symmetrically disposed on two sides of the coal rock sample 7, the ultrasonic monitoring transmitter 601 is connected with the ultrasonic monitoring control module 4 through an ultrasonic monitoring signal output line 603, the ultrasonic monitoring receiver 602 is connected with the ultrasonic monitoring control module 4 through an ultrasonic monitoring signal input line 604, the ultrasonic monitoring control module 4 enables the ultrasonic monitoring transmitter 601 to transmit an ultrasonic monitoring signal to the coal rock sample 7 in the drying process through the ultrasonic monitoring signal output line 603 without interruption, and the ultrasonic monitoring signal is received by the ultrasonic monitoring receiver 602 and then fed back to the ultrasonic monitoring control module 4 through the ultrasonic monitoring signal input line 604 and displayed on the monitoring display screen 3.
Further, the ultrasonic detection device 6 is adhered to the center of the side face of the coal rock sample 7 through a high-temperature-resistant coupling agent and can be fixed through a rubber ring in an auxiliary mode.
Furthermore, the sampling rate of the ultrasonic monitoring control module 4 is set to be 0.1us, the signal attenuation and the pulse width need to be selected according to the properties of the sample, the denser the sample is, the better the intensity is, the smaller the set signal attenuation is, and the larger the pulse width is; the measurement accuracy of the mass monitoring balance 8 was 0.01 g.
Further, the monitoring display screen 3 includes an ultrasonic monitoring display screen 301 and a quality monitoring display screen 302, the ultrasonic monitoring display screen 301 is used for displaying ultrasonic monitoring data, and the quality monitoring display screen 302 is used for displaying quality monitoring data.
Further, the temperature adjusting range of the drying device temperature control module 2 is 30-300 ℃.
Further, the quality monitoring balance 8 comprises a main testing balance 801 and an auxiliary testing balance 802, the main testing balance 801 and the auxiliary testing balance 802 are respectively arranged at two ends below the drying device heat insulation sealing box 1, and the monitoring display screen 3 displays the real-time testing average value of the main testing balance 801 and the auxiliary testing balance 802. .
Further, the coal rock sample 7 is a regular sample in national standard of GB/T23561.4-2009 coal and rock physical and mechanical property determination method.
Furthermore, the inner surface of the heat insulation sealing box 1 of the drying device is made of galvanized ceramic materials, and the size is 500mm multiplied by 500 mm.
Example 2:
referring to fig. 1-2, on the basis of embodiment 1, the present invention provides a drying method based on a lossless drying apparatus, comprising the following steps:
s1: fixing a coal rock sample 7 to be dried in a drying device heat insulation sealing box 1, arranging an ultrasonic detection device 6 on the side surface of the coal rock sample 7, and arranging a mass monitoring balance 8 below the drying device heat insulation sealing box 1;
s2: opening an ultrasonic monitoring control module 5, carrying out initial ultrasonic signal monitoring on a coal rock sample 7, and adjusting an air pumping valve 5 through a drying device master control module 1 to select a hot air drying mode or a vacuum heat drying mode according to the detection results of longitudinal wave speeds of different coal rocks; selecting a drying temperature, and controlling a heating module 9 to heat and dry the coal rock sample 7 through a drying device temperature control module 2;
the hot air drying mode is that the air exhaust valve 5 is in a bidirectional air flowing state, and the air outside the drying device heat insulation seal box 1 is continuously sucked into the drying device heat insulation seal box 1 and heated and dried;
in the vacuum heat drying mode 5, in a one-way air flow state, the interior of the heat-insulating sealing box 1 of the drying device is vacuumized to start heating and drying, and the vacuum is maintained until the drying is finished;
when the coal rock sample 7 is sandstone: the detection result of the longitudinal wave velocity is 4000m/s, a hot air drying mode is selected, and the drying temperature is selected to be 105-; selecting a vacuum heat drying mode when the detection result of the longitudinal wave velocity is less than 4000m/s, selecting the drying temperature of 105-110 ℃, and reducing the drying temperature to 80-105 ℃ according to the attenuation speed of the wave velocity;
when the coal rock sample 7 is mudstone or shale: the detection result of the longitudinal wave velocity is 3200-3500m/s, the hot air drying mode is selected, and the drying temperature is selected from 105-110 ℃;
when the coal rock sample 7 is coal: selecting a hot air drying mode and a drying temperature of 105-; the detection result of the longitudinal wave velocity is 1500-2000m/s, a vacuum heat drying mode is selected, and the drying temperature is selected to be 105-110 ℃; the detection result of the longitudinal wave velocity is less than 1500m/s, a vacuum heat drying mode is selected, and the drying temperature is selected to be 80-105 ℃;
s3: the ultrasonic monitoring control module 5 detects in real time to display data on the monitoring display screen 3, and the mass monitoring balance 8 detects in real time to display data on the monitoring display screen 3;
s4: when the monitoring display screen 3 displays that the cumulative sudden change of the wave speed monitored by ultrasonic exceeds 10% or the detection waveform is distorted, the drying mode or the drying temperature is damaged to the coal rock sample 7, and the drying mode needs to be changed or the drying temperature needs to be reduced and the drying time needs to be prolonged;
when the monitoring display screen 3 shows that the quality attenuation is less than 1g/h, the drying temperature is reduced by 10 ℃ to continue drying,
when the monitoring display screen 3 shows that the quality attenuation is less than 0.1g/h, the drying temperature is reduced by 10 ℃ to continue drying,
when the monitoring display screen 3 shows that the quality attenuation is less than 0.01g/h, the drying is stopped.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Within the technical idea of the invention, various equivalent changes can be made to the technical scheme of the invention, and the equivalent changes all belong to the protection scope of the invention.
Claims (8)
1. The utility model provides a harmless drying device based on coal petrography body ultrasonic monitoring which characterized in that: the drying device temperature control system comprises a drying device temperature insulation sealing box (1), a drying device temperature control module (2), a monitoring display screen (3), an ultrasonic monitoring control module (4), an air pumping and discharging valve (5) and a heating module (9), wherein the heating module (9) and the air pumping and discharging valve (5) are respectively connected with the drying device temperature control module (2);
air drainage valve (5) are installed on drying device separates temperature seal box (1), install on drying device separates temperature seal box (1) inner wall heating module (9), drying device separates temperature seal box (1) and has placed in and treat dry coal petrography sample (7), be provided with ultrasonic detection device (6) on coal petrography sample (7) side, drying device separates temperature seal box (1) below and is provided with quality monitoring balance (8), ultrasonic detection device (6) are connected with ultrasonic monitoring control module (4), ultrasonic monitoring control module (4) and quality monitoring balance (8) are connected with monitoring display screen (3) respectively.
2. The nondestructive drying device based on the ultrasonic monitoring of the coal-rock mass as claimed in claim 1, characterized in that: ultrasonic testing device (6) include ultrasonic monitoring transmitter (601) and ultrasonic monitoring receiver (602), ultrasonic monitoring transmitter (601) and ultrasonic monitoring receiver (602) symmetry set up the both sides in coal petrography sample (7), ultrasonic monitoring transmitter (601) are connected with ultrasonic monitoring control module (4) through ultrasonic monitoring signal output line (603), ultrasonic monitoring receiver (602) are connected with ultrasonic monitoring control module (4) through ultrasonic monitoring signal input line (604).
3. The nondestructive drying device based on the ultrasonic monitoring of the coal rock mass as claimed in claim 1 is characterized in that: the ultrasonic detection device (6) is adhered to the center of the side face of the coal rock sample (7) through a high-temperature-resistant couplant.
4. The nondestructive drying device based on the ultrasonic monitoring of the coal rock mass as claimed in claim 1 is characterized in that: the sampling rate of the ultrasonic monitoring control module (4) is set to be 0.1us, and the measurement precision of the mass monitoring balance (8) is 0.01 g.
5. The nondestructive drying device based on the ultrasonic monitoring of the coal rock mass as claimed in claim 1 is characterized in that: the monitoring display screen (3) comprises an ultrasonic monitoring display screen (301) and a quality monitoring display screen (302).
6. The nondestructive drying device based on the ultrasonic monitoring of the coal rock mass as claimed in claim 1 is characterized in that: the temperature adjusting range of the drying device temperature control module (2) is 30-300 ℃.
7. The nondestructive drying device based on the ultrasonic monitoring of the coal rock mass as claimed in claim 1 is characterized in that: the quality monitoring balance (8) comprises a main testing balance (801) and an auxiliary testing balance (802), wherein the main testing balance (801) and the auxiliary testing balance (802) are respectively arranged at two ends of the lower portion of the drying device heat-insulating sealing box (1).
8. The drying method based on the nondestructive drying apparatus of any one of claims 1 to 7, characterized by comprising the steps of:
s1: fixing a coal rock sample (7) to be dried in a drying device heat insulation sealing box (1), arranging an ultrasonic detection device (6) on the side surface of the coal rock sample (7), and arranging a quality monitoring balance (8) below the drying device heat insulation sealing box (1);
s2: opening an ultrasonic monitoring control module (5), carrying out initial ultrasonic signal monitoring on a coal rock sample (7), and adjusting an air pumping valve (5) through a drying device master control module (1) to select a hot air drying mode or a vacuum hot drying mode according to the longitudinal wave velocity detection results of different coal rock masses; selecting a drying temperature, and controlling a heating module (9) to heat and dry the coal rock sample (7) through a drying device temperature control module (2);
the hot air drying mode is that the air exhaust valve (5) is in a bidirectional air flowing state, and the external air of the drying device heat insulation seal box (1) is continuously sucked into the drying device heat insulation seal box (1) and heated and dried;
the vacuum heat drying mode is that (5) the drying device is in a one-way air flow state, the interior of the heat-insulating sealing box (1) of the drying device is vacuumized to start heating and drying, and the vacuum is maintained until the drying is finished;
when the coal rock sample (7) is sandstone: the detection result of the longitudinal wave velocity is 4000m/s, a hot air drying mode is selected, and the drying temperature is selected to be 105-; the detection result of the longitudinal wave velocity is less than 4000m/s, a vacuum heat drying mode is selected, and the drying temperature is selected from 105-;
when the coal rock sample (7) is mudstone or shale: the detection result of the longitudinal wave velocity is 3200-3500m/s, the hot air drying mode is selected, and the drying temperature is selected from 105-110 ℃;
when the coal rock sample (7) is coal: selecting a hot air drying mode and a drying temperature of 105-; the detection result of the longitudinal wave velocity is 1500-2000m/s, a vacuum heat drying mode is selected, and the drying temperature is selected to be 105-110 ℃; the detection result of the longitudinal wave velocity is less than 1500m/s, a vacuum heat drying mode is selected, and the drying temperature is selected to be 80-105 ℃;
s3: the ultrasonic monitoring control module (5) detects in real time to display data on the monitoring display screen (3), and the mass monitoring balance (8) detects in real time to display data on the monitoring display screen (3);
s4: when the monitoring display screen (3) displays that the cumulative sudden change of the wave speed monitored by the ultrasonic wave exceeds 10 percent or the detected waveform is distorted, changing the drying mode or reducing the drying temperature and prolonging the drying time;
when the monitoring display screen (3) shows that the quality attenuation is less than 1g/h, the drying temperature is reduced by 10 ℃ to continue drying,
when the monitoring display screen (3) shows that the quality attenuation is less than 0.1g/h, the drying temperature is reduced by 10 ℃ to continue drying,
when the monitoring display screen (3) shows that the quality attenuation is less than 0.01g/h, the drying is stopped.
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| CN205352941U (en) * | 2016-02-02 | 2016-06-29 | 中国石油大学(北京) | Real -time pyrolysis detecting system of oil shale |
| CN108801188A (en) * | 2018-06-26 | 2018-11-13 | 上海航天电子通讯设备研究所 | The measurement tooling and measurement method of telemetering module centroid position on bullet |
| CN113029509A (en) * | 2021-03-26 | 2021-06-25 | 中国空气动力研究与发展中心超高速空气动力研究所 | Shock tunnel thrust measurement test device |
| CN113188868A (en) * | 2021-05-06 | 2021-07-30 | 安徽理工大学 | Coal rock nondestructive infiltration-drying circulating pretreatment device and method |
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