Microwave heating type coal quality online analysis device and application thereof

Abstract

The invention belongs to the field of coal quality analysis, and discloses a microwave heating type coal quality on-line analysis device and application thereof.The device comprises an on-line sample collecting and preparing module, a microwave heating module, a weight collecting module and an analysis control module, and the microwave heating module comprises a microwave drying cavity, a microwave devolatilization cavity and a microwave ashing cavity; each chamber is connected with a microwave temperature control unit for independent temperature control; the online sampling and sample preparation module is used for collecting coal from a coal conveying line in real time, crushing the coal into standard coal samples, and feeding the standard coal samples into the corresponding treatment chambers for microwave heating treatment; the microwave ashing cavity is further connected with an oxygen supply unit, and the oxygen supply unit is used for providing an oxygen-enriched environment for the microwave ashing cavity; the weight acquisition module is connected with the analysis control module and is used for acquiring the weight of the standardized coal sample before and after heating; and the analysis control module is used for controlling the microwave temperature control unit to adjust the temperature of the corresponding chamber and obtain various indexes of the standardized coal sample. According to the invention, the efficient and full-automatic microwave heating coal quality online sampling analysis effect can be realized.

Description

Technical Field

[0001] The present application belongs to the technical field of coal quality analysis, and more specifically, relates to a microwave heating type coal quality online analysis device and its application. Background Art

[0002] Traditional coal analysis methods often face problems such as long time, complex operation and human interference, which limits their application in online monitoring and rapid analysis of coal quality. At present, although a variety of coal quality detection technologies such as neutron prompt gamma-ray activation analysis, near-infrared reflection spectroscopy, laser-induced breakdown spectroscopy, and X-ray fluorescence spectroscopy have been applied to online coal quality analysis, these methods generally have the following disadvantages: on the one hand, they all need to rely on a large number of standard samples to construct a coal quality calibration model, which not only increases the workload of preliminary preparation, but also limits the adaptability of the model; on the other hand, due to the low analysis accuracy of the model on non-standard sample coal types, these methods have large errors in the actual application of diversified coal sources, and it is difficult to meet the needs of efficient and accurate detection of coal quality under the current situation of extensive coal sources and various coal types.

[0003] Microwave heating has the advantages of fast heating, simple operation and low energy consumption, and has shown broad prospects in coal quality analysis. In particular, this method does not rely on the traditional calibration model, which enables it to break through the restrictions on coal types. However, existing microwave heating devices are mostly limited to the detection of a single indicator (such as moisture or ash content) and require manual operation, which cannot achieve comprehensive online automatic detection of multiple indicators of coal quality on the coal conveyor belt. Summary of the invention

[0004] In view of the defects of the prior art, the purpose of this application is to provide a microwave heating coal quality online analysis device and its application, which mainly solves the problem of real-time online continuous and fully automatic detection of multiple key indicators of coal samples during coal transmission.

[0005] To achieve the above-mentioned purpose, the present application provides a microwave heating type coal quality online analysis device, which includes a microwave heating module, an online sampling module, a weight collection module and an analysis control module, wherein: The microwave heating module comprises a microwave drying cavity, a microwave volatilization cavity and a microwave ashing cavity, wherein the microwave drying cavity, the microwave volatilization cavity and the microwave ashing cavity are respectively connected to a microwave temperature control unit for independent temperature control; The online sampling module is used to collect coal from the coal transportation line in real time and crush it into standardized coal samples, and send the same standardized coal samples into the microwave drying chamber, microwave volatilization chamber and microwave ashing chamber for synchronous heating treatment; the microwave ashing chamber is also connected to an oxygen supply unit, and the oxygen supply unit is used to keep the microwave ashing chamber in an oxygen-rich environment during the process of processing the standardized coal samples; The weight collection module is connected to the analysis and control module, and is used to collect the weight of the corresponding standardized coal samples before and after heating treatment in the microwave drying cavity, microwave volatilization cavity and microwave ashing cavity; the analysis and control module is used to control the microwave temperature control unit to adjust the temperature of the corresponding chamber, and obtain the moisture value, volatile matter value and ash value of the standardized coal sample based on the weight.

[0006] Furthermore, the online sampling module includes a sampling component and a sample processing device, the sampling component includes a primary mining machine arranged on the coal conveyor belt, and a primary conveyor belt and a secondary conveyor belt are arranged below the coal conveyor belt from top to bottom in sequence, and a secondary mining machine is arranged on the primary conveyor belt; the primary mining machine is used to collect samples from the coal conveyor belt and transfer the coal samples to the primary conveyor belt; the sample processing equipment includes a crusher, the crusher is fixed directly below the secondary mining machine and is located above the secondary conveyor belt, the secondary mining machine is used to collect secondary samples from the primary conveyor belt, and the collected coal samples are transported to the crusher for crushing into the standardized coal samples.

[0007] Furthermore, a three-mining machine is provided on the secondary conveyor belt, and a sample collector is provided below the three-mining machine. A part of the standardized coal samples in the crusher falls onto the secondary conveyor belt. The three-mining machine is used to take samples from the secondary conveyor belt and send the collected standardized coal samples into the sample collector for storage.

[0008] Furthermore, the online sampling module also includes a robotic arm, a material receiving container, a scraper and a crucible. The robotic arm is located beside the coal conveying line, and is used to move the material receiving container to the bottom of the crusher to receive the standardized coal sample; the robotic arm is also used to translate the material receiving container to pass under the scraper, and to level the standardized coal sample in the material receiving container through the scraper; the robotic arm is also used to move the material receiving container to the crucible to transfer the standardized coal sample into the crucible.

[0009] Furthermore, the robotic arm is arranged on a linear track, the microwave drying chamber, microwave volatilization chamber and microwave ashing chamber are arranged side by side on one side of the linear track, and the crucible is arranged on the other side of the linear track; the robotic arm can translate along the linear track to send the crucible containing the standardized coal sample into the corresponding microwave drying chamber, microwave volatilization chamber and microwave ashing chamber in sequence.

[0010] Furthermore, a gas collection unit is connected to the exhaust end of the microwave ashing cavity, and the gas collection unit is used to collect ashing gas generated by the microwave ashing cavity. The gas collection unit is also connected to a gas analysis module, and the gas analysis module is used to monitor the gas concentration of the ashing gas.

[0011] Furthermore, a filtering unit is provided at the gas outlet of the microwave ashing cavity; and / or an inlet flow meter is provided at the gas inlet end of the gas collection unit, and an outlet flow meter is also provided at the gas outlet end; the outlet end of the inlet flow meter is connected to the gas analysis module.

[0012] Furthermore, the microwave temperature control unit includes a magnetron and a temperature sensor respectively connected to the analysis and control module, the temperature sensor is used to monitor the real-time temperature in the corresponding cavity, and the analysis and control module can control the magnetron to adjust the magnetron power based on the real-time temperature to keep the corresponding chamber at a constant temperature.

[0013] Furthermore, the microwave temperature control unit also includes a thermal insulation pad, which is arranged on the bottom surface of the corresponding cavity.

[0014] According to another aspect of the present application, there is also provided an application method of the microwave heating type coal quality online analysis device as described in any one of the above items, the application method comprising the following steps: The S1 online sampling module collects coal from the coal transportation line in real time and crushes it into standardized coal samples. The same standardized coal samples are then transmitted to the weight collection module for weighing and then sent to the microwave drying chamber, microwave volatilization chamber and microwave ashing chamber respectively; S2 analysis and control module controls the microwave temperature control units in the microwave drying chamber, microwave volatilization chamber and microwave ashing chamber to adjust the temperature respectively, so that the temperature in the microwave drying chamber is maintained at the dehydration temperature of the coal sample, the temperature in the microwave volatilization chamber is maintained at the ashing temperature of the coal sample, and the temperature in the microwave ashing chamber is maintained at the volatilization temperature of the coal sample; both the microwave drying chamber and the microwave ashing chamber are oxygen-free environments; the analysis and control module also controls the oxygen supply unit to supply oxygen to the microwave ashing chamber to form an oxygen-rich environment, so as to ash the corresponding standardized coal sample; The S3 online sampling module transmits the dehydrated coal sample obtained by the microwave drying chamber treatment, the volatilized coal sample obtained by the microwave volatilization chamber treatment and the ashed coal sample obtained by the microwave ashing chamber treatment to the weight collection module for weighing, and transmits the corresponding weights to the analysis and control module for comparative analysis with the corresponding weights before heating treatment to obtain the moisture value, volatile matter value and ash value of the corresponding standardized coal sample.

[0015] In general, the above technical solutions conceived by this application have the following technical advantages compared with the prior art: 1. The microwave-heated coal quality online analysis device provided in this application combines an online sampling and sample preparation device, a microwave heating device and an online analysis technology, and realizes real-time multi-level sampling and sample preparation, multi-category microwave heating treatment and multi-index online analysis of coal quality on the coal transportation line. The entire device does not require human participation in operation, and all actions can be fully automatically executed, overcoming the limitations of traditional methods and improving analysis efficiency.

[0016] 2. The microwave-heated coal quality online analysis device provided in this application realizes adjustable adaptation to any scenario by modularizing the online sampling module, microwave heating module, weight collection module and analysis control module, etc., and can adapt to various coal production, transportation and other related industrial scenarios, and can meet the detection needs of various coal quality indicators of different types of coal, with a wide range of application scope and application prospects.

[0017] 3. The microwave heating coal quality online analysis device provided in the present application arranges a microwave drying chamber, a microwave volatilization chamber and a microwave ashing chamber in parallel, and uses a robotic arm to transfer the same coal sample into the three chambers at the same time, thereby realizing synchronous, efficient and independent detection of equal amounts of identical coal samples, and can synchronously obtain multiple indicators of the same standardized coal sample, so that the detection results are more accurate and can achieve the effect of efficient and rapid detection.

[0018] 4. In the application method of the microwave-heated coal quality online analysis device provided in the present application, the heat insulation bin, heat preservation gasket and adjustment of magnetic control power are combined to realize independent temperature control of different chambers. When the mechanical arm grabs the crucible and sends it to the designated chamber, the analysis control module receives the instruction to open the chamber door, the mechanical arm places the crucible in the corresponding chamber and continues the next step. After the mechanical arm leaves the chamber, the chamber door is closed. Due to the opening and closing of the chamber door and the placement of the crucible and materials, the temperature in the chamber will drop. At this time, the real-time temperature in the chamber is read by the temperature sensor. If the temperature drops, the analysis control module will adjust the temperature in the chamber by adjusting the magnetic control power to stabilize it at the designated temperature; when there is no crucible and coal sample in the chamber, the chamber temperature can be kept constant by using the heat preservation gasket and adjusting the magnetic control power, which is more energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the microwave heating type coal quality online analysis device provided in Example 1 of the present application; Figure 2 It is a schematic diagram of the partial structure of the sampling module provided in Example 1 of the present application; Figure 3 This is a schematic diagram of the local structure of the coal quality heating analysis area provided in Example 1 of the present application; Figure 4 This is a schematic diagram of the microwave heating cavity structure provided in Example 1 of the present application.

[0020] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein: A-microwave drying chamber group, B-microwave volatilization chamber group, C-microwave ashing chamber group, 1-primary mining machine, 2-secondary mining machine, 3-tertiary mining machine, 4-secondary mining plug plate, 5-crushing plug plate, 6-crusher, 7-coal conveyor belt, 8-sample collector, 9-bucket elevator, 10-material receiving container, 11-scraper, 12-mechanical arm, 13-filter unit, 14-crucible rack, 15-gas analysis module, 16-fan, 17-gas valve , 18-inlet pipe, 19-outlet pipe, 20-crucible, 21-temperature sensor, 22-gasket, 23-magnetron, 24-gas collection unit, 25-microwave drying chamber, 26-microwave volatilization chamber, 27-microwave ashing chamber, 28-inlet flow meter, 29-outlet flow meter, 30-weight collection module, 31-primary conveyor belt, 32-secondary conveyor belt, 33-waste collection port, 34-linear track. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] Example 1 Embodiment 1 of the present application provides a microwave heating type coal quality online analysis device, such as Figure 1-3 As shown, the online analysis device includes an online sampling module, a microwave heating module, a weight collection module 30 and an analysis control module, wherein: The microwave heating module includes a microwave drying chamber 25, a microwave volatilization chamber 26 and a microwave ashing chamber 27, all of which are made of metal. The microwave drying chamber 25, the microwave volatilization chamber 26 and the microwave ashing chamber 27 are respectively connected to a microwave temperature control unit for independent temperature control; specifically, a plurality of microwave drying chambers 25 constitute a microwave drying chamber group A, which can simultaneously dry a plurality of standardized coal samples; a plurality of microwave volatilization chambers 26 constitute a microwave volatilization chamber group B, which can simultaneously volatilize a plurality of standardized coal samples; a plurality of microwave ashing chambers 27 constitute a microwave ashing chamber group C, which can simultaneously ashing a plurality of standardized coal samples, and the number of corresponding chambers can be increased or decreased according to demand.

[0023] The online sampling module is used to collect coal from the coal transportation line in real time and crush it into standardized coal samples, and send the same standardized coal samples into the microwave drying chamber 25, the microwave volatilization chamber 26 and the microwave ashing chamber 27 for synchronous heating treatment; the microwave ashing chamber 27 is also connected to an oxygen supply unit, which is used to supply oxygen to the microwave ashing chamber 27 so as to maintain an oxygen-rich environment during the processing of the standardized coal samples.

[0024] The weight collection module 30 is connected to the analysis and control module, and a weighing balance can be specifically selected. The weight collection module 30 is used to collect the weight of the standardized coal sample before and after heating treatment in the microwave drying chamber 25, the microwave volatilization chamber 26 and the microwave ashing chamber 27; the analysis and control module is used to control the microwave temperature control unit to adjust the temperature of the corresponding chamber, and is also used to obtain the moisture value, volatile matter value and ash value of the standardized coal sample based on the weight collected by the weight collection module 30.

[0025] The aforementioned sampling module includes a sample processing device and a sampling component. The sample processing device includes a crusher 6 and a sample collector 8; the sampling component includes a primary mining machine 1 arranged on the coal conveyor belt 7. The primary mining machine 1 is located on the end belt of the coal conveyor belt 7 along the coal conveying direction. When the coal is transported to the position of the primary mining machine 1 along the coal conveyor belt 7, the primary mining machine 1 performs initial sampling.

[0026] A primary conveyor belt 31 and a secondary conveyor belt 32 are arranged in order from top to bottom directly below the aforementioned coal conveyor belt 7. The movement direction of the primary conveyor belt 31 is opposite to the conveying direction of the coal conveyor belt 7, and the movement direction of the secondary conveyor belt 32 is the same as the movement direction of the primary conveyor belt 31. The primary mining machine 1 transfers the coal sample collected from the coal conveyor belt 7 to the primary conveyor belt 31.

[0027] The aforementioned primary conveyor belt 31 is provided with a secondary mining plug board 4 and a secondary mining machine 2. The secondary mining plug board 4 is used to stop the coal sample transported in the direction of the secondary mining machine 2. The secondary conveyor belt 32 is provided with a tertiary mining machine 3. The crusher 6 is fixed just below the secondary mining machine 2 and is located above the secondary conveyor belt 32. A crushing plug board 5 is provided on the coal conveying line of the secondary mining machine 2 to stop the coal sample falling into the crusher 6. The primary conveyor belt 31 is inclined relative to the horizontal plane. The secondary mining machine 2 is located at the higher end of the primary conveyor belt 31, which is used to perform secondary sampling of the coal sample on the primary conveyor belt 31, and to send a part of the coal sample obtained by the secondary sampling into the crusher 6 for crushing into a standardized coal sample. A part of the standardized coal sample after crushing will be received by the receiving container 10 for subsequent coal quality analysis, and the rest will fall onto the secondary conveyor belt 32.

[0028] The aforementioned three-coal mining machine 3 is located on one end of the secondary conveyor belt 32 near the lower end of the primary conveyor belt 31, and a sample collector 8 is provided below the secondary conveyor belt 32, and the sample collector 8 is located directly below the three-coal mining machine 3. The three-coal mining machine 3 is used to take samples from the secondary conveyor belt 32 and transfer the obtained standardized coal samples to the sample collector 8 for storage for subsequent analysis and comparison. The remaining standardized coal samples on the secondary conveyor belt 32 move with the secondary conveyor belt 32 to the end where the bucket elevator 9 is located, and are transferred to the coal conveyor belt 7 again through the bucket elevator 9.

[0029] The aforementioned online sampling module also includes a robot arm 12, a material receiving container 10, a scraper 11 and a crucible 20. The robot arm 12 is located beside the coal conveying line, and can clamp the material receiving container 10 and move it to the bottom of the crusher 6 to receive the standardized coal sample. The scraper 11 is fixed to the side of the crusher 6, or fixed to any position beside the robot arm. The robot arm 12 controls the movement of the material receiving container 10 and makes its receiving port pass under the scraper 11, and the standardized coal sample in the material receiving container 10 is leveled by the scraper 11. The robot arm 12 is also used to move the leveled material receiving container 10 to the crucible 20, and control the flipping of the material receiving container 10 to dump the standardized coal sample into the crucible 20.

[0030] Specifically, the aforementioned mechanical arm 12 is arranged on a linear track 34, which is located on a horizontal plane beside the coal conveying line and is perpendicular to the coal conveying belt 7. The microwave drying chamber 25, the microwave volatilization chamber 26 and the microwave ashing chamber 27 are arranged side by side on one side of the linear track 34, and the crucible rack 14 is arranged on the other side of the linear track 34 and close to the coal conveying line, and is provided with a plurality of accommodating chambers, and a plurality of crucibles 20 are arranged in rows in the corresponding accommodating chambers. The analysis control module is used to control the robotic arm 12 to perform corresponding actions according to a preset program. Specifically, the robotic arm 12 grabs the material receiving container 10 and moves it to the crucible rack 14, and pours the standardized coal sample therein into the corresponding crucible 20, then returns the material receiving container 10 to its original position, and then grabs the crucibles 20 to be weighed on the weight collection module 30 in turn, and then grabs the weighed crucibles 20 and translates them along the linear track 34 to send the crucible 20 containing the standardized coal sample into the corresponding microwave drying chamber 25, microwave volatilization chamber 26 and microwave ashing chamber 27, and repeats the actions of material receiving, leveling, transferring, weighing and translating until all microwave drying chambers 25, microwave volatilization chambers 26 and microwave ashing chambers 27 are filled with standardized coal samples to be treated with microwave heating.

[0031] The exhaust end of the microwave ashing cavity 27 is connected to a gas collection unit 24, which is used to collect ashing gases generated by the microwave ashing cavity 27, such as sulfur dioxide, carbon dioxide, nitrogen oxides and other gases. The gas collection unit 24 is also connected to a gas analysis module 15, which is used to monitor the gas concentrations of sulfur dioxide, carbon dioxide, nitrogen oxides and the like. More specifically, a filter unit 13 is also provided at the exhaust end of the microwave ashing cavity 27, and the filter unit 13 is used to filter impurities in the gas product. Its gas outlet end is connected to the gas collection unit 24, and a gas collection bag can be selected as the gas collection unit 24 to collect the gas product after filtering the impurities.

[0032] An air inlet flow meter 28 is also provided at the air inlet end of the gas collection unit 24, and a fan 16 is also provided between the air inlet flow meter 28 and the filter unit 13 for adjusting the gas flow rate; an air outlet flow meter 29 is also provided at the air outlet end of the gas collection unit 24, and the air outlet flow meter 29 is connected to the gas analysis module 15, and a gas valve 17 is provided between the two for opening and closing the gas flow path; a fan 16 is also provided between the gas valve 17 and the air outlet flow meter 29; the air inlet flow meter 28 and the air outlet flow meter 29 are respectively electrically connected to the gas analysis module, and can collect the gas volume entering and leaving the gas collection unit 24 and transmit the relevant data to the gas analysis module 15 for subsequent analysis, and the data in the gas analysis module 15 can be transmitted to the analysis control module for subsequent calculation.

[0033] The aforementioned microwave temperature control unit includes a magnetron 23 and a temperature sensor 21 respectively connected to the analysis and control module. The temperature sensor 21 is used to monitor the real-time temperature in the corresponding cavity. The analysis and control module receives the real-time temperature measured by the temperature sensor 21, and controls the magnetron 23 to adjust its magnetron power based on the real-time temperature so that the corresponding cavity maintains a constant temperature. Specifically, the magnetron 23 is connected to the corresponding cavity through a waveguide, and the temperature sensor 21 is arranged inside the corresponding cavity. More specifically, the microwave temperature control unit also includes a thermal insulation pad 22, which is arranged on the bottom surface of the corresponding cavity.

[0034] The structures of the microwave drying chamber 25, the microwave volatilization chamber 26 and the microwave ashing chamber 27 are as follows: Figure 4 As shown, an air inlet pipe 18 and an air outlet pipe 19 are also provided at the top of each chamber.

[0035] The aforementioned analysis and control module includes a PLC controller and a computer. The PLC controller is mainly used to realize the temperature control of the corresponding chamber based on the temperature collected by the temperature sensor 21, as well as the timing logic control of the entire set of microwave-heated coal quality online analysis devices, such as coordinating the working sequence of the mechanical arm, each microwave chamber, gas analysis module and other equipment to realize the automatic transmission and phased detection of coal samples; the computer is mainly used to analyze and calculate the moisture, ash, volatile matter, sulfur, carbon content and nitrogen content of the standardized coal sample based on the weight collected by the weight collection module 30. Both the PLC controller and the computer are existing products, and their connection, control and information transmission relationship with other power electronic units are technical means well known to those skilled in the art, and will not be repeated here.

[0036] Example 2 This embodiment provides an application method of the microwave heating type coal quality online analysis device as described in Embodiment 1, and the application method comprises the following steps: The S1 online sampling module collects coal from the coal conveying line in real time and crushes it into standardized coal samples, and then sends the same standardized coal samples into the microwave drying chamber 25, the microwave volatilization chamber 26 and the microwave ashing chamber 27 respectively.

[0037] Specifically, when the coal is transported to the position of the primary mining machine 1 along the coal conveyor belt 7, the primary mining machine 1 performs the initial sampling, and the primary mining machine 1 transfers the coal sample collected from the coal conveyor belt 7 to the primary conveyor belt 31; the secondary mining machine 2 performs secondary sampling on the coal sample on the primary conveyor belt 31, and sends a part of the coal sample obtained by the secondary collection to the crusher 6 for crushing into a standardized coal sample, and a part of the standardized coal sample after crushing will be received by the receiving container 10 for subsequent coal quality analysis, and the rest will fall on the secondary conveyor belt 32. The tertiary mining machine 3 takes samples from the secondary conveyor belt 32 and transfers the obtained standardized coal sample to the sample collector 8 for storage.

[0038] The robot arm 12 clamps the receiving container 10 and moves it to the bottom of the crusher 6 to receive the standardized coal sample; then the robot arm 12 continues to control the movement of the receiving container 10, and makes the receiving port pass under the scraper 11, and the standardized coal sample in the receiving container 10 is leveled by the scraper 11; then the leveled receiving container 10 is moved to the crucible 20, and the receiving container 10 is controlled to flip to transfer the standardized coal sample into the crucible 20, and then the empty receiving container 10 is returned to its original position (that is, to any suitable position convenient for the robot arm to clamp). Finally, the crucible 20 containing the standardized coal sample is clamped, and the crucible 20 is translated along the linear track 34 to send the crucible 20 into the corresponding chamber.

[0039] Step S1 is repeated until all reaction chambers are filled with crucibles 20 containing standardized coal samples.

[0040] The S2 analysis and control module controls the temperature adjustment of the microwave temperature control units in the microwave drying chamber 25, the microwave volatilization chamber 26 and the microwave ashing chamber 27 respectively, so that the temperature in the microwave drying chamber 25 is maintained at the dehydration temperature of the coal sample, the temperature in the microwave volatilization chamber 26 is maintained at the ashing temperature of the coal sample, and the temperature in the microwave ashing chamber 27 is maintained at the volatilization temperature of the coal sample; both the microwave drying chamber 25 and the microwave ashing chamber 27 are oxygen-free environments; the analysis and control module also controls the oxygen supply unit to supply oxygen to the microwave ashing chamber 27 to form an oxygen-rich environment, so as to ash the corresponding standardized coal samples.

[0041] The analysis and control module receives the real-time temperature in the corresponding chamber measured by the temperature sensor 21, and controls the magnetron 23 to adjust its magnetron power based on the real-time temperature so that the corresponding chamber maintains a constant temperature for a certain period of time; specifically, the temperature of the microwave drying chamber 25 is maintained at 105 (±5) ° C for about 6 minutes, and oxygen will not be blown into the chamber during the dehydration process; the temperature in the microwave ashing chamber 27 is maintained at 900 (±5) ° C for about 6 minutes, and an external oxygen supply unit will blow oxygen into the chamber during the ashing process to ensure that the interior of the chamber is an oxygen-rich environment; the temperature of the microwave volatilization chamber 26 is maintained at 900 (±5) ° C for about 6 minutes, and oxygen will not be blown into the volatilization analysis process to ensure an oxygen-free environment.

[0042] After the microwave heating treatment is completed in step S3, the online sampling module is controlled to transmit the dehydrated coal sample obtained in the microwave drying chamber 25, the volatilized coal sample obtained in the microwave volatilization chamber 26 and the ashed coal sample obtained in the microwave ashing chamber 27 in step S2 to the weight collection module 30 for weighing, and the corresponding weights are transmitted to the analysis and control module for comparative analysis with the corresponding weights before the heating treatment to obtain the moisture value, volatile matter value and ash value of the corresponding standardized coal sample.

[0043] After the analysis is completed, the robot arm 12 pours the waste in the crucible 20 into the waste collection port 33, which can be set at the end of the secondary conveyor belt 32 away from the three-mining machine 3, and then the empty crucible is returned to the corresponding position of the crucible rack 14. Repeat the above operation to complete the moisture drying, volatile analysis and ash burning of various samples in a cycle. Among them, when the sample is burned in the ashing chamber group 27, the gas generated therein is detected by the gas analysis module 15. In this way, the online analysis of the coal quality on the coal conveyor belt 7 is realized.

[0044] In this embodiment, the moisture detection stage is to make the microwave drying chamber 25 continue to dry the standardized coal sample at 105°C for 6 minutes. The water vapor generated in this process is discharged through the exhaust pipe 19. According to the initial weight of the standardized coal sample weighed before entering the furnace, it is 9.48g. After the dehydration is completed, the weight of the standardized coal sample after dehydration is weighed to be 8.24g, thereby calculating the moisture value of the coal sample. M for:

[0045] The volatile matter detection is that the microwave volatile analysis chamber 26 continuously heats the standardized coal sample at 900°C and isolates the air for 6 minutes. During the volatile analysis process, the generated smoke is discharged from the exhaust pipe 19. According to the initial weight of the standardized coal sample weighed before entering the furnace, which is 9.48g, the weight of the dehydrated standardized coal sample after the volatile analysis is completed is 6.49g, and the volatile matter value of the standardized coal sample is calculated. V for:

[0046] Ash content detection is to burn the standardized coal sample in microwave ashing chamber 27 at 900℃ and oxygen-rich conditions for 6 minutes. The gas generated in the ashing process is discharged and collected through the exhaust pipe. The initial weight of the standardized coal sample weighed before entering the furnace is 9.48g. After the ash burning is completed, the weight of the standardized coal sample after dehydration is 2.64g, and the volatile content value of the standardized coal sample is calculated. A for:

[0047] Fixed Carbon FC for:

[0048] According to the gas flow data collected by the inlet flow meter 28 and the outlet flow meter 29, the total standard volume of the blown air is calculated to be 40L and the total standard volume of the gas in the gas collection unit 24 is 55L. According to the concentration values ​​measured by the gas analysis module, CO2, SO2 and NO are calculated. X The standard volumes are 14.502L, 0.065L and 0.075L respectively, and the corresponding molar numbers are 0.647mol, 0.0027mol and 0.0033mol respectively. According to the chemical reaction formula , and The molar numbers of elements C, S and N were calculated to be 0.647 mol, 0.0029 mol and 0.0033 mol, respectively, and the corresponding masses were 7.77 g, 0.09 g and 0.05 g, respectively; from this, the carbon, nitrogen and sulfur contents of the standardized coal sample were calculated to be 81.91%, 0.95% and 0.53%, respectively.

[0049] The high calorific value is calculated according to the following empirical formula HV for:

[0050] The low calorific value is calculated according to the following empirical formula LHV for:

[0051] It should be understood that expressions such as "include" and "may include" used in this application indicate the existence of the disclosed functions, operations or constituent elements, and do not limit one or more additional functions, operations and constituent elements. In this application, terms such as "include" and / or "have" may be interpreted as indicating specific characteristics, numbers, operations, constituent elements, components or combinations thereof, but may not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components or combinations thereof.

[0052] It should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0053] In the description of the present application, “plurality” means two or more than two, unless otherwise clearly and specifically defined.

[0054] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A microwave heating type coal quality online analysis device, characterized in that: The online analysis device comprises a microwave heating module, an online sampling module, a weight collection module (30) and an analysis control module, wherein: The microwave heating module comprises a microwave drying chamber (25), a microwave volatilization chamber (26) and a microwave ashing chamber (27), wherein the microwave drying chamber (25), the microwave volatilization chamber (26) and the microwave ashing chamber (27) are respectively connected to a microwave temperature control unit for independent temperature control; The online sampling module is used to collect coal from the coal transportation line in real time and crush it into standardized coal samples, and to send the same standardized coal samples into the microwave drying chamber (25), the microwave volatilization chamber (26) and the microwave ashing chamber (27) for synchronous heating treatment; the microwave ashing chamber (27) is also connected to an oxygen supply unit, and the oxygen supply unit is used to maintain an oxygen-rich environment in the microwave ashing chamber (27) during the process of processing the standardized coal samples; The weight collection module (30) is connected to the analysis control module and is used to collect the weight of the corresponding standardized coal sample before and after the heating treatment in the microwave drying chamber (25), the microwave volatilization chamber (26) and the microwave ashing chamber (27); The analysis control module is used to control the microwave temperature control unit to adjust the temperature of the corresponding chamber, and obtain the moisture value, volatile matter value and ash value of the standardized coal sample based on the weight.

2. A microwave heating type coal quality online analysis device as claimed in claim 1, characterized in that: The online sampling module comprises a sampling component and a sample processing device. The sampling component comprises a primary mining machine (1) arranged on a coal conveyor belt (7). A primary conveyor belt (31) and a secondary conveyor belt (32) are arranged in sequence from top to bottom below the coal conveyor belt (7). A secondary mining machine (2) is arranged on the primary conveyor belt (31). The primary mining machine (1) is used to collect samples from the coal conveyor belt (7) and transfer the coal samples to the primary conveyor belt (31). The sample processing device comprises a crusher (6). The crusher (6) is fixed directly below the secondary mining machine (2) and is located above the secondary conveyor belt (32). The secondary mining machine (2) is used to collect secondary samples from the primary conveyor belt (31) and transfer the collected coal samples to the crusher (6) for crushing into the standardized coal samples.

3. A microwave heating type coal quality online analysis device as claimed in claim 2, characterized in that: A three-coal mining machine (3) is also provided on the secondary conveyor belt (32), and a sample collector (8) is provided below the three-coal mining machine. A portion of the standardized coal samples in the crusher (6) falls onto the secondary conveyor belt (32). The three-coal mining machine (3) is used to take samples from the secondary conveyor belt (32) and send the collected standardized coal samples into the sample collector (8) for storage.

4. A microwave heating type coal quality online analysis device as claimed in claim 2, characterized in that: The online sampling module further comprises a mechanical arm (12), a material receiving container (10), a scraper (11) and a crucible (20). The mechanical arm (12) is located beside the coal conveying line and is used to move the material receiving container (10) to the bottom of the crusher (6) to receive the standardized coal sample; the mechanical arm (12) is also used to move the material receiving container (10) horizontally to pass under the scraper (11) and to level the standardized coal sample in the material receiving container (10) through the scraper (11); the mechanical arm is also used to move the material receiving container (10) to the crucible (20) to transfer the standardized coal sample into the crucible (20).

5. A microwave heating type coal quality online analysis device as claimed in claim 4, characterized in that: The mechanical arm (12) is arranged on a linear track (34); the microwave drying chamber (25), the microwave volatilization chamber (26) and the microwave ashing chamber (27) are arranged side by side on one side of the linear track (34); and the crucible (20) is arranged on the other side of the linear track (34); the mechanical arm (12) can translate along the linear track (34) to sequentially deliver the crucible (20) containing the standardized coal sample into the corresponding microwave drying chamber (25), the microwave volatilization chamber (26) and the microwave ashing chamber (27).

6. The microwave heating type coal quality online analysis device according to claim 1, characterized in that: The exhaust end of the microwave ashing cavity (27) is connected to a gas collection unit (24), and the gas collection unit (24) is used to collect ashing gas generated by the microwave ashing cavity (27); the gas collection unit (24) is also connected to a gas analysis module (15), and the gas analysis module (15) is used to monitor the concentration of ashing gas.

7. A microwave heating type coal quality online analysis device as claimed in claim 6, characterized in that: The microwave ashing cavity (27) is provided with a filter unit (13) at its gas outlet; and / or the gas collection unit (24) is provided with a gas inlet flow meter (28) at its gas inlet and a gas outlet flow meter (29) at its gas outlet; the gas outlet of the gas outlet flow meter (29) is connected to the gas analysis module (15).

8. The microwave heating type coal quality online analysis device according to claim 1, characterized in that: The microwave temperature control unit comprises a magnetron (23) and a temperature sensor (21) respectively connected to the analysis control module, the temperature sensor (21) being used to monitor the real-time temperature in the corresponding cavity, and the analysis control module being able to control the magnetron (23) to adjust the magnetron power based on the real-time temperature so as to keep the corresponding cavity at a constant temperature.

9. A microwave heating type coal quality online analysis device as claimed in claim 8, characterized in that: The microwave temperature control unit further comprises a thermal insulation pad (22), wherein the thermal insulation pad (22) is arranged on the bottom surface of the corresponding cavity.

10. An application method of the microwave heating type coal quality online analysis device according to any one of claims 1 to 9, characterized in that: The application method comprises the following steps: The S1 online sampling module collects coal from the coal conveying line in real time and crushes it into standardized coal samples, and then transmits the same standardized coal samples to the weight collection module (30) for weighing and then respectively sends them to the microwave drying chamber (25), the microwave volatilization chamber (26) and the microwave ashing chamber (27); The S2 analysis control module controls the microwave temperature control units in the microwave drying chamber (25), the microwave volatilization chamber (26) and the microwave ashing chamber (27) to adjust the temperatures respectively, so that the temperature in the microwave drying chamber (25) is maintained at the coal sample dehydration temperature, the temperature in the microwave volatilization chamber (26) is maintained at the coal sample ashing temperature, and the temperature in the microwave ashing chamber (27) is maintained at the coal sample volatilization temperature; the microwave drying chamber (25) and the microwave ashing chamber (27) are both oxygen-free environments; the analysis control module also controls the oxygen supply unit to supply oxygen to the microwave ashing chamber (27) to form an oxygen-rich environment, so as to ashe the corresponding standardized coal sample; The online sampling module S3 transmits the dehydrated coal sample obtained in the microwave drying chamber (25), the volatilized coal sample obtained in the microwave volatilization chamber (26), and the ashed coal sample obtained in the microwave ashing chamber (27) in step S2 to the weight collection module (30) for weighing, and transmits the corresponding weights to the analysis control module for comparison and analysis with the corresponding weights before the heating treatment, so as to obtain the moisture value, volatile matter value, and ash value of the corresponding standardized coal sample.

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