CN111707691A - Controllable neutron source mobile coal composition rapid detection device - Google Patents

Abstract

The invention discloses a controllable neutron source mobile coal composition rapid detection device, which comprises a neutron source component, a detector component, a signal processing component, a communication component and a mobile component. The neutron source assembly includes a neutron tube, a neutron source module, a neutron tube power supply module and a neutron tube control module; the detector assembly includes a gamma ray detector and a detector protection module; the signal processing assembly It includes a gamma energy spectrum generation module, a coal element analysis module and a coal industry index analysis module; the communication component contains a communication module, which supports network port communication and wireless communication; the mobile component includes a swastika scraper, a scraper drive motor and an external drive connector. The components of the device are integrated in the cylindrical shell, which can quickly detect the coal composition of the vehicle before the reeling, and can change the measurement point and measurement depth. It has the characteristics of movable equipment, switchable neutron source, and high measurement accuracy.

Description

Controllable neutron source mobile coal composition rapid detection device

technical field

The invention relates to a controllable neutron source mobile coal composition rapid detection device, which belongs to the technical field of automatic detection and nuclear detection. Specifically, it relates to a rapid detection device for coal quality components of coal transported by automobiles and trains.

Background technique

The rapid detection technology of coal composition mainly includes dual energy gamma analysis technology, X fluorescence coal element analysis technology, laser induced spectroscopy technology and prompt gamma ray neutron activation analysis technology. Dual-energy gamma analysis technology cannot detect the elemental composition of raw coal, but can only detect the total ash content of raw coal. The detection accuracy is greatly affected by changes in coal bulk density and raw coal composition. The effective element measurement range of X-ray fluorescence coal element analysis technology is from element 11 (Na) to element 92 (U), but it can only detect the composition of coal surface, which is greatly affected by coal particle size and surface shape, and is not suitable for block The detection of raw coal is more used in the analysis of pulverized coal samples in the laboratory environment. The detection of coal by laser-induced spectroscopy technology requires sampling and sample preparation, and the light is easily contaminated, so it cannot directly detect the raw coal. Prompt Gamma Neutron Activation Analysis (PGNAA) has been widely used in the on-line detection of elemental components in ores and coal, and is currently a feasible technology for rapid on-line detection of raw coal.

In the field of prompt gamma ray neutron activation analysis, most of the technical products at home and abroad are cross-belt on-line detection equipment for coal composition, either directly for the detection of raw coal on the main conveyor belt, or for the auxiliary belt after mechanical sampling. The raw coal on it is tested. For a large amount of coal transported into the factory by car or train, it is still sampled by a mechanical sampler and tested by a laboratory. It is not possible to obtain coal quality data in time, and it is impossible to timely judge whether the incoming coal meets the incoming standards.

Cars and trains transport coal to the customer's factory. Both parties need to quickly judge and confirm the coal's elemental composition and industrial composition. The current cross-belt coal composition on-line detection equipment cannot directly detect the coal composition in cars and trains. Therefore, Can not meet the customer's requirements for rapid and accurate detection of incoming coal quality.

The on-line detection equipment for coal composition based on isotope radioactive sources cannot turn off the neutron source during non-working hours, which makes the use, maintenance and management of the equipment inconvenient and restricts the enthusiasm of users.

The controllable neutron source mobile coal composition rapid detection device can carry out mobile detection of coal for automobiles and trains, and can judge the neutron source when it is not working, so that the equipment is very convenient to use, maintain, move and manage.

SUMMARY OF THE INVENTION

technical problem:

The technical problem to be solved by the present invention is to use a controllable neutron source mobile device to quickly detect coal quality components for incoming coal transported by automobiles or trains, that is, before the coal is reeled, no sampling is required, and the elemental components and The industrial composition index is quickly detected to help users judge whether the coal quality meets the technical requirements in time.

Technical solutions:

For achieving the above object, the technical scheme adopted in the present invention is as follows:

The invention discloses a controllable neutron source mobile coal composition rapid detection device, comprising a neutron source component, a detector component, a signal processing component, a communication component and a mobile component; the neutron source component, the detector component, the Signal processing components, communication components, and mobile components are all integrated and packaged in a cylindrical shell;

The neutron source assembly includes a neutron tube, a neutron source module, a neutron tube power supply module, and a neutron tube control module, the neutron tube can be turned off when not in operation, and no neutrons are generated, and can generate stable neutrons according to requirements during operation. the output of neutrons; the detector assembly includes a gamma ray detector and a detector protection module, receives characteristic gamma rays, and generates electrical pulse signals corresponding to it; the neutron source assembly and the detector assembly are located in Measure the top of the end face, and perform scattering measurement on the coal composition below the measurement end face;

The signal processing component includes a gamma energy spectrum generation module, a coal element analysis module and a coal industry index analysis module; the gamma energy spectrum generation module filters, amplifies and filters the gamma pulse signal from the gamma ray detector. Digital processing, and generate a gamma energy spectrum; the coal element analysis module completes the gamma energy spectrum identification, and analyzes the content of each element of the coal; the coal industry index analysis module analyzes the coal calorific value, ash content, Moisture, sulfur and other industrial indicators;

The communication component includes a communication module, supports network port communication and wireless communication, and can access the device of the present invention wirelessly by using a computer and a mobile phone client program, and can query the working state parameters of the device of the present invention and the measured gamma energy spectrum, coal Elemental composition, coal industry composition index and other data.

The moving assembly is connected with the external driving device through the external driving connection port; the external driving device can move the device of the present invention up and down as a whole through the rotation of the screw rod, and can perform non-contact measurement on the coal, or can be driven by the scraper driving motor of the device. The advancement of the front swastika scraper makes the measurement end face penetrate into the interior of the coal for measurement; the external drive equipment can also drive the device of the present invention to move left and right and back and forth as a whole to transform each measurement point;

In the present invention, preferably, the neutron tube is a deuterium-tritium type neutron tube, the neutron energy is 14MeV, and the neutron yield is 1×10 ⁸ n/s;

In the present invention, preferably, the neutron source module comprises a neutron moderator and a neutron shield composed of bismuth blocks, graphite blocks, and high-density polyethylene board materials;

In the present invention, preferably, the gamma ray detector includes a NaI (Tl) crystal, a photomultiplier tube and a preprocessing circuit;

In the present invention, preferably, the NaI(Tl) crystal has a size of 4×4×16” cube.

In the present invention, preferably, the detector protection module includes a neutron protection structure composed of boron carbide and high-density polyethylene plates.

Beneficial effects:

Compared with the prior art, the present invention has the following beneficial effects:

The device of the invention can be installed in coal-using enterprises such as power plants, cement plants, chemical plants, etc. that transport coal into the plant by automobiles or trains, and together with the corresponding driving equipment, constitutes a cantilever type or portal type automatic detection system for incoming coal quality. When the coal transport vehicle enters the factory, it can quickly detect the C, H, N, S, Si, Al, Ca, Fe, Ti, Na, K of the coal on the vehicle without the cumbersome process of coal sampling, sample preparation and testing. , Mg and other elements content, online analysis of calorific value, ash content, ash composition, volatile matter, total moisture, sulfur content, ash melting point and other industrial composition indicators. The driving device can drive the device of the present invention to move forward and backward and left and right above the vehicle to change the measurement point; it can also drive the front swastika scraper to advance through the rotation of the screw rod combined with the scraper drive motor of the device, so that the device of the present invention moves up and down to change Measure the depth so that the measurements more accurately reflect the quality of the coal carried by the vehicle.

The isotope neutron source is replaced by an electrically controllable neutron tube. In the detection, not only the thermal neutron capture reaction is used, but also the fast neutron inelastic scattering reaction is used, and the monochromatic energy spectrum is better. The measurement accuracy of main elements is higher, and the neutron source can be turned off when not working, which is convenient to use and manage.

The customer can use the computer and the mobile phone client program to wirelessly access the device of the present invention, and can inquire about the working state parameters of the device, and can inquire about the measurement data of the coal composition. The invention can provide powerful help for customers to grasp the quality of incoming coal in time, and provide scientific basis for reasonable stockpiling and use of coal.

Description of drawings

FIG. 1 is a block diagram of the overall structure of the present invention.

FIG. 2 is a structural block diagram of the portal-type automatic coal composition measurement system integrated with the external drive according to the present invention.

Figure 3 is a performance table of coal elemental analysis.

Figure 4 is a performance table for coal industry analysis.

List of reference numbers:

0- Controllable Neutron Source Mobile Coal Composition Rapid Detection Device, 1- Neutron Tube, 2- Neutron Source Module, 3- Neutron Tube Power Module, 4- Neutron Tube Control Module, 5- Gamma Ray Detection device, 6-detector protection module, 7-gamma energy spectrum generation module, 8-coal element analysis module, 9-coal industry index analysis module, 10-communication module, 11-swastika scraper, 12-random knife drive motor , 13-external drive connection port, 14-measurement end face, 15-connection port, 16-cylindrical shell, 17-coal, 18-external drive device, 19-screw, 20-moving beam, 21-supporting stand , 22- the first motor, 23- the second motor, 24- the third motor.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and examples, and embodiments of the present invention include but are not limited to the following examples.

As shown in FIG. 1 , the neutron source components, detector components, signal processing components, communication components, etc. of the controllable neutron source mobile coal composition rapid detection device according to the present invention are all integrated and packaged in a cylindrical shell 16 , the device of the present invention can be conveniently moved as a whole, so as to realize the rapid detection of the mobile coal composition.

In order to achieve mobility, both the neutron tube 1 and the gamma ray detector 5 are located above the measurement end surface 14, and the coal below the measurement end surface 14 is subjected to scattering measurement, and the neutrons generated by the neutron tube 1 are irradiated in a fan-shaped distribution. The coal below, the irradiated coal, emits characteristic gamma rays through thermal neutron capture reaction, which is received by the gamma ray detector 5 . This scattering measurement method overcomes the inherent defect that the transmission measurement method is difficult to move.

In order to achieve mobility, the present invention integrates the signal processing component and the communication component, the neutron source component and the detector component into the same housing 16; the signal processing component includes a gamma energy spectrum generation module 7, a coal element The analysis module 8 and the coal industry index analysis module 9; the communication component includes a communication module 10, which supports wireless communication; so that the device of the present invention only needs a 220VAC power cord for electrical connection with the outside, which is connected through the wiring port 15; Customers can wirelessly access the device of the present invention through the computer and mobile phone client program to obtain the working state parameters of the device of the present invention, and inquire about the gamma energy spectrum, coal element composition, and coal industrial composition.

Further, the neutron source assembly includes a neutron tube, a neutron source module, a neutron tube power supply module and a neutron tube control module; The energy is 14MeV, and the neutron yield is 1×10 ⁸ n/s; the neutron source module 2 includes neutron moderators and neutrons composed of bismuth blocks, lead blocks, graphite blocks, and high-density polyethylene plate materials The protective body, in the measurement direction, the neutrons emitted by the neutron source are sufficiently moderated into thermal neutrons by the neutron moderator to irradiate the coal 17 to be tested, and in the non-measurement direction, the corresponding neutralization is carried out by the neutron protective body. child protection.

Further, the detector assembly includes a gamma ray detector 5 and a detector protection module 6; further, the gamma ray detector 5 includes a NaI (Tl) crystal, a photomultiplier tube and a preprocessing circuit, The NaI(Tl) crystal is a cube with a size of 4×4×16”, the diameter of the light window of the photomultiplier tube is 90mm (3.5”), and the preprocessing circuit includes a photomultiplier tube voltage divider power supply circuit and Signal pulse preamplifier circuit; the detector protection module 6 includes a neutron protection structure composed of boron carbide and high-density polyethylene plates to prevent neutron damage to NaI (Tl) crystals.

Further, the gamma energy spectrum generation module 7 is a nuclear electronic circuit based on a digital signal processing DSP chip, is connected to the gamma ray detector, receives signals from the gamma ray detector, performs amplification, filtering and digital processing to generate The composite gamma energy spectrum signal is sent to the coal element analysis module 8 .

Further, the coal element analysis module 8 receives the digitized gamma energy spectrum signal from the gamma energy spectrum analyzer 6, and after energy spectrum correction, peak finding and spectrum desorption operations, obtains the constituent elements C, H, N in the coal. , S, Si, Al, Ca, Fe, Ti, Na, K, Mg, Cl, etc.

Further, the coal industry analysis module 9 analyzes the coal industrial composition indicators online, such as calorific value, ash content, volatile matter, total moisture, ash composition, ash melting point, etc., on the basis of obtaining coal element content data in real time.

After the device of the present invention is connected with external driving equipment, it can form application systems such as a portal type automatic coal composition measurement system, a cantilever type coal composition automatic measurement system, a coal composition automatic measurement mobile vehicle, etc. Now the portal type coal composition automatic measurement system shown in FIG. A measurement system is used as an example.

As shown in FIG. 2 , the device of the present invention is fixedly connected to the external driving device 18 through the driving connection port 13 . The external driving device 18 has a first motor 22 and a second motor 23 inside, which respectively drive the device of the present invention to move up and down and left and right.

The first motor 22 drives the screw rod 19 to rotate, so that the device of the present invention can be moved up and down. The device of the present invention can be left on the vehicle coal seam to measure the coal composition non-contact, or it can be embedded in the coal seam to measure the coal composition, and the device of the present invention can be driven downward. When going deep into the coal seam, the scraper driving motor 11 inside the device of the present invention is activated synchronously, and the swastika scraper is driven to rotate to remove the coal in the advance.

The second motor 23 enables the external driving device 18 to drive the device of the present invention to move left and right along the moving beam 20, and the third motor 24 can drive the moving beam 20 to move forward and backward along the supporting stand rail 21. By driving the device of the present invention to the left and right above the vehicle coal Move and move back and forth, you can change the measurement point arbitrarily, combined with the up and down movement to change the measured coal depth, so that the measurement results are more representative.

Figure 3 shows the performance indicators that the device of the present invention can achieve by on-line detection of its element composition after testing and experimentation.

Figure 4 shows the performance index that can be achieved by the on-line detection of the industrial components of the device of the present invention after testing and experimentation.

The present invention provides an idea and method for a controllable neutron source mobile coal composition rapid detection device. There are many specific methods and approaches for realizing the technical solution. The above are only the preferred embodiments of the present invention. It should be pointed out that for For those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims (8)

1. The movable type coal composition rapid detection device of the controllable neutron source is characterized by comprising a neutron source component, a detector component, a signal processing component, a communication component and a moving component, wherein the neutron source component comprises a neutron tube (1), a neutron source module (2), a neutron tube power supply module (3) and a neutron tube control module (4); the detector assembly comprises a gamma ray detector (5) and a detector protection module (6); the neutron source assembly and the detector assembly are both positioned above the measuring end face (14), and scattering measurement is carried out on coal (17) below the measuring end face (14);

the signal processing assembly comprises a gamma energy spectrum generating module (7), a coal element analyzing module (8) and a coal industry index analyzing module (9); the gamma energy spectrum generating module (7) filters, amplifies and digitizes the pulse signals from the gamma ray detector (5) to generate a gamma energy spectrum; the coal element analysis module (8) completes the gamma energy spectrum identification and analyzes the content of each element of the coal; the coal industry index analysis module (9) analyzes the coal heat productivity, ash content, moisture content, sulfur content and other industry indexes based on the coal element content;

the communication component is internally provided with a communication module (10) and supports internet access communication and wireless communication;

the moving assembly is connected with external driving equipment through an external driving connecting port (13), and can integrally move the detection device and change the measurement point; the device can be driven to rotate integrally by external driving equipment through a screw rod (19), and the scraper driving motor (12) is matched to drive the swastika scraper (11) to advance, so that non-contact measurement can be carried out above coal (17), and the measuring end face (14) can be embedded into the coal (17) for measurement.

2. The mobile type coal composition rapid detection device of a controllable neutron source according to claim 1, characterized in that the neutron source assembly, the detector assembly, the signal processing assembly, the communication assembly and the moving assembly are all integrally encapsulated in a cylindrical shell (16).

3. The mobile type coal composition rapid detection device with the controllable neutron source as claimed in claim 1, wherein the neutron tube (1) is a deuterium-tritium type neutron tube with neutron energy of 14MeV and neutron yield of 2 × 10⁸n/s。

4. The mobile type coal composition rapid detection device with a controllable neutron source as claimed in claim 1, wherein wireless access can be performed by using a computer and a mobile phone client program, and measurement data such as working state parameters, gamma energy spectrum, coal element composition, coal industry composition indexes and the like can be queried.

5. The mobile type coal composition rapid detection device with the controllable neutron source as claimed in claim 1 is characterized in that the neutron source module (2) comprises a neutron moderator and a neutron shield made of bismuth block, graphite block, high-density polyethylene plate material.

6. The mobile type coal composition rapid detection device with controllable neutron source according to claim 1, characterized in that the gamma ray detector (5) comprises NaI (Tl) crystal, photomultiplier and preprocessing circuit.

7. A mobile type coal composition rapid detection device with a controllable neutron source as claimed in claim 6, characterized in that said NaI (Tl) crystal is a cube with 4 x 16 "specification.

8. The mobile type coal composition rapid detection device with the controllable neutron source is characterized in that the detector protection module (6) comprises a neutron protection structure formed by boron carbide and high-density polyethylene plates.

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