Coal combustion spectrum detection device and detection method

Abstract

The present invention relates to a coal combustion spectrum detection device and detection method. First, the mass of the coal sample is weighed, the coal sample is ignited and the spectrum is detected; all spectral curves of the coal sample in different time periods during combustion are obtained, and the total radiation per unit mass of the coal sample is calculated based on all spectral curves; finally, the total radiation per unit mass is respectively substituted into the fitting data model of the corresponding index data, and the index data of the coal sample corresponding to the fitting data model are respectively obtained, and the index data at least includes calorific value and ash content. Compared with the traditional method, the calorific value and ash content of the coal sample measured by this method are simpler to operate, show extremely high convenience, and reduce the difficulty of operation, so as to effectively improve the test efficiency, and can quickly obtain accurate test results in a relatively short time. In addition, only a single device can be used to achieve the detection of sample ash content, calorific value and other conventional instruments that cannot be completed, effectively saving time and labor costs.

Description

Technical Field

[0001] The invention relates to the field of coal industrial testing, and in particular to a coal combustion spectrum detection device and a detection method.

[0002] At present, in the field of coal-fired power generation, it is very important to detect the calorific value and ash content of coal. The ash content affects combustion efficiency, equipment wear and pollutant emissions, while the calorific value directly determines the energy that coal can generate, which is related to power generation costs and output efficiency. At present, the coal industry mostly tests the calorific value and ash content of coal through traditional testing methods. Although the traditional testing methods have high test index accuracy, they have many disadvantages. For example, the need for complex operations such as sampling, sample preparation, drying, and powdering of samples leads to cumbersome test steps and long test time, which affects test efficiency. In addition, the test process also requires different laboratory instruments to perform test tests based on different sample, component and characteristic analysis standard methods, resulting in high equipment and labor costs. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a coal combustion spectrum detection device and detection method, which solves the problems of complex operating steps in the prior art during coal calorific value and ash content detection, and the need to switch different equipment to measure different parameters, resulting in low efficiency and high cost.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A coal combustion spectrum detection method comprises the following steps:

[0006] Step S1, weighing the mass of the coal sample, igniting the coal sample and performing spectrum detection on it;

[0007] Step S2: Obtain all spectral curves of the coal sample at different time periods during combustion, and calculate the total radiation per unit mass E of the coal sample based on all spectral curves. g ;

[0008] Step S3: The total radiation per unit mass E g Substitute them into the fitting data model of the corresponding index data respectively, and obtain the index data of the coal sample corresponding to the fitting data model respectively, and the index data at least includes calorific value and ash content.

[0009] Furthermore, the step of building a fitting data model is also included:

[0010] Obtain reference sample weight and index data;

[0011] Ignite the reference sample and perform spectral detection on it;

[0012] Obtain all spectral curves of the reference sample during the combustion stage, and calculate the total radiation per unit mass E of the reference sample based on all spectral curves g ;

[0013] Repeat the above steps at least 10 times to obtain the total radiation per unit mass E of at least 10 groups of reference samples. g ;

[0014] Get the fitted data model of the fourth-order polynomial fit of the indicator data

[0015]

[0016] Where: Y-index data, the total radiation per unit mass E of at least 10 groups of reference samples g Substitute the fitting data model into the fitting data model and combine with the indicator data to determine the coefficients a1, a2, a3, a4, and a5 in the fitting data model, and then determine the fitting data model.

[0017] Furthermore, the fitting data model of the indicator data at least includes:

[0018]

[0019] In the formula: Q—calorific value, unit: MJ / kg;

[0020] Eg—total radiation per unit mass of coal sample;

[0021] A, B, C, D, and F are obtained by using the fitting data model building step; and / or

[0022]

[0023] In the formula: Ash—ash content, unit: %

[0024] Eg—total radiation per unit mass of coal sample;

[0025] a, b, c, d, and e are obtained by using the fitting data model building step.

[0026] Furthermore, the step of obtaining all spectral curves of different time periods during the combustion of the coal sample comprises the following steps:

[0027] Step S 21 , set the integration time and interval time of the spectrum detection unit;

[0028] Step S 22 During the combustion stage of the coal sample, the spectrum detection unit is controlled to collect data according to the integration time and interval time to obtain several single measurement spectrum curves.

[0029] Furthermore, the total radiation per unit mass E g The calculation method is:

[0030] Based on the spectral curve of each single measurement, obtain the flame spectral radiation I of a single measurement λi ;

[0031] Flame spectral radiation I based on the spectral curves of all time periods during the combustion stage of coal samples λi , obtain the total radiation E of the flame spectrum collected during the combustion stage of the coal sample;

[0032] Calculate the total radiation per unit mass E g ,Right now

[0033]

[0034] Where: E g —Total radiation per unit mass E g , unit: wAU / g;

[0035] E—total flame spectrum radiation collected during the combustion stage of the coal sample, unit: wAU;

[0036] t1—the time when the coal sample starts to burn, in seconds;

[0037] t2—combustion end time of coal sample, unit: s;

[0038] 1—The lower limit of the wavelength in the spectrum curve during the combustion time of the coal sample, in nm;

[0039] 2—The upper limit of the wavelength in the spectrum curve during the combustion time of the coal sample, in nm;

[0040] I λi — single measurement of flame spectral radiation;

[0041] m—mass of coal sample, unit: g.

[0042] In order to achieve the above object, the present invention also adopts the following technical solutions:

[0043] A coal combustion spectrum detection device, comprising:

[0044] A combustion container, having a combustion chamber for burning and testing the sample, wherein a sample combustion position is arranged inside the combustion chamber, and an ignition device is arranged in the area of ​​the top of the combustion container aligned with the sample combustion position;

[0045] A spectrum detection unit, located above the sample combustion position, for obtaining spectrum data when the sample is burning;

[0046] An oxygen supply control unit, which is connected to the interior of the combustion chamber through an air inlet provided in the combustion container, and is used to control the charging and discharging of oxygen in the combustion container;

[0047] A control system is communicatively connected with the spectrum detection unit and the oxygen supply control unit to execute any one of the coal combustion spectrum detection methods.

[0048] Further, the spectrum detection unit includes an optical fiber connecting line, an optical fiber analysis unit and a plurality of optical fiber probes;

[0049] Several of the fiber optic probes are arranged on the top of the combustion container and the collection directions of several of the fiber optic probes are aligned with the position of the sample combustion position. Several of the fiber optic probes are communicatively connected to the spectral detection unit through the fiber optic connecting line. The fiber optic probes are used to collect spectral information of the flame when the sample is burning. The fiber optic connecting line is used to transmit the spectral information collected by the fiber optic probes to the fiber optic analysis unit. The fiber optic analysis unit is used to analyze the received spectral information and then transmit it to the control system to calculate the index data of the coal sample.

[0050] Furthermore, a plurality of mounting holes for the optical fiber probe to be mounted on the top of the combustion container are provided, and lenses are provided on the mounting holes. When the sample burns, the light source of the flame first passes through the lens and then reaches the collection direction of the optical fiber probe for spectrum collection.

[0051] Furthermore, the combustion container is also provided with a pressure detection element, and the pressure detection element is communicatively connected with the control system for real-time monitoring and controlling the pressure inside the combustion chamber when sealed and feeding back to the control system.

[0052] Furthermore, the oxygen supply control unit comprises an air inlet pipeline and an air outlet pipeline, and both the air inlet pipeline and the air outlet pipeline are connected to the combustion chamber through the air inlet to control the oxygenation and degassing of the combustion chamber;

[0053] The air inlet pipeline and the air outlet pipeline are both provided with solenoid valves, and the solenoid valves are communicatively connected with the control system.

[0054] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0055] The present invention relates to a coal combustion spectrum detection method, which comprises the following steps: firstly, weighing the mass of a coal sample, igniting the coal sample and performing spectrum detection on the coal sample; obtaining all spectrum curves of the coal sample at different time periods during combustion, and calculating the total radiation per unit mass E of the coal sample based on all spectrum curves. g ; Finally, the total radiation per unit mass E gSubstitute them into the fitting data model corresponding to the index data, and obtain the index data of the coal sample corresponding to the fitting data model, wherein the index data at least includes calorific value and ash content. Compared with the traditional method, the method for measuring the calorific value and ash content of the coal sample is simpler to operate, and does not require time-consuming drying and milling steps, showing extremely high convenience and reducing the difficulty of operation, thereby effectively improving the test efficiency and being able to quickly obtain accurate test results in a short time. In addition, only a single device can be used to achieve the detection of sample ash content, calorific value and other conventional instruments that cannot be completed, effectively saving time and labor costs.

[0056] The present invention also provides a coal moisture infrared detection device corresponding to the above-mentioned coal moisture infrared detection method, which has the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0058] Figure 1 This is a flow chart of the coal combustion spectrum detection method provided by the present invention.

[0059] Figure 2 It is a schematic structural diagram of a coal combustion spectrum detection device provided in one embodiment of the present invention.

[0060] Figure 3 It is a schematic structural diagram of a spectrum detection unit provided in one embodiment of the present invention.

[0061] Figure 4 An example diagram of a single spectrum curve provided in one embodiment of the present invention.

[0062] Description of reference numerals:

[0063] 1. Combustion container; 11. Combustion chamber; 12. Sample combustion position; 13. Ignition device; 14. Mounting hole position; 141. Lens; 15. Air inlet; 16. Combustion cover; 17. Body;

[0064] 2. Spectrum detection unit; 21. Optical fiber connecting line; 22. Optical fiber analysis unit; 23. Optical fiber probe;

[0065] 3. Oxygen supply control unit; 31. Air inlet pipeline; 32. Air outlet pipeline; 33. Solenoid valve;

[0066] 4. Control system;

[0067] 5. Pressure detection element. DETAILED DESCRIPTION

[0068] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0069] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0070] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected 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 the present invention can be understood according to specific circumstances.

[0071] As attached Figure 1 As shown, a coal combustion spectrum detection method comprises the following steps:

[0072] Step S1, weighing the mass of the coal sample, igniting the coal sample and performing spectrum detection on it.

[0073] Specifically, step S1 includes the following steps: first weigh the mass of the coal sample and record it as m, set a combustion chamber 11 and set a spectral detection unit 2 inside it, seal the combustion chamber 11 and fill it with oxygen, ignite the coal sample in the combustion chamber 11, and perform spectral detection on the coal sample during combustion through the spectral detection unit 2.

[0074] Step S2: Obtain all spectral curves of the coal sample at different time periods during combustion, and calculate the total radiation per unit mass E of the coal sample based on all spectral curves. g。

[0075] Wherein, obtaining the spectral curve includes the following steps:

[0076] Step S 21 , set the integration time and interval time of the spectrum detection unit 2;

[0077] Step S 22 , during the combustion stage of the coal sample, the spectrum detection unit 2 is controlled to collect according to the integration time and the interval time to obtain a number of single-measurement spectrum curves.

[0078] Specifically, the integration time determines the duration of the entire spectrum detection process, while the interval time determines the frequency of obtaining different spectrum curves. The total integration time and interval time of the spectrum detection unit 2 are set according to the actual needs of the user and the characteristics of the coal sample object. When obtaining the spectrum curve within the total combustion time, the spectrum detection unit 2 will perform segmented detection according to the set integration time, and record the spectrum curve of each integration time period at the end of each integration time period. Through the spectrum curve, all data information from the start time of the coal sample combustion to the end time of the coal sample combustion is obtained to assist in calculating the total radiation per unit mass E g strength.

[0079] Furthermore, the total radiation per unit mass E g The calculation method is:

[0080] (1) First, the radiation intensity I measured by the spectrum detection unit 2 is obtained through the spectrum curve. λi , for wavelength λ i Integrate, where I λi The intensity needs to be subtracted from the background intensity to obtain the flame radiation intensity I of a single measurement. i ,Right now

[0081]

[0082] Where: 1—The lower limit of the wavelength in the spectrum curve during the combustion time of the coal sample, in nm; 2—The upper limit of the wavelength in the spectrum curve during the combustion time of the coal sample, in nm;

[0083] The first spectral curve example is shown in the attached figure. Figure 4 As shown, this spectrum curve 1 takes 500nm, 2 takes 1100nm to calculate the flame radiation intensity I1 measured this time. The lower limit of the wavelength in the spectrum curve of the coal sample during the combustion time of the spectrum curve of different amplitudes and the upper limit of the wavelength in the spectrum curve of the coal sample during the combustion time are slightly different. It is necessary to analyze the specific situation according to the different amplitudes of the spectrum curve, and finally calculate I iIn addition, the subtraction of background intensity is a function of the spectral detection unit itself and does not require manual operation.

[0084] (2) The flame radiation intensity I during the entire burning period i Integrate to obtain the total flame spectrum radiation E collected during the sample combustion time, that is,

[0085]

[0086] Where: t1—the time when the coal sample starts to burn, in seconds;

[0087] t2—combustion end time of coal sample, unit: s;

[0088] (3) Simply combine the above formulas to get

[0089]

[0090] (4) From this, we can calculate the total radiation per unit mass E g The calculation formula is:

[0091]

[0092] Where: E g —Total radiation per unit mass E g , unit: wAU / g;

[0093] E—total flame spectrum radiation during the burning time, unit: wAU;

[0094] t1—the time when the coal sample starts to burn, in seconds;

[0095] t2—combustion end time of coal sample, unit: s;

[0096] 1—The lower limit of the wavelength in the spectrum curve during the combustion time of the coal sample, in nm;

[0097] 2—The upper limit of the wavelength in the spectrum curve during the combustion time of the coal sample, in nm;

[0098] I λi —Radiation intensity obtained from a single measurement;

[0099] m—mass of coal sample, unit: g.

[0100] Step S3: The total radiation per unit mass E g Substitute them into the fitting data model of the corresponding index data respectively, and obtain the index data of the coal sample corresponding to the fitting data model respectively, and the index data at least include calorific value and ash content.

[0101] Furthermore, the calculation process of this step can be selected to be carried out in the computer system software connected to the device, or it can be calculated manually. Before starting the calculation, the fitting data model should be constructed in advance through a quartic polynomial, that is, the functional relationship between the index data and the total radiation per unit mass should be established through a reference sample, and finally the index data of the coal sample should be determined by the measured total radiation per unit mass through the above functional relationship. In addition to the ash content and calorific value of the coal sample, if the user wants to obtain other index data of the coal sample, it is also only necessary to construct a relevant fitting data model, substitute the measured total radiation per unit mass into the model, and then obtain the corresponding index data. In addition, the reference sample needs to select a coal reference sample with a known weight and index data to be tested.

[0102] Therefore, the detection method also includes the step of constructing a fitting data model:

[0103] Obtain the weight and index data of the reference sample; ignite the reference sample and perform spectral detection on it; obtain all spectral curves of the reference sample during the combustion stage, and calculate the total radiation per unit mass E of the reference sample based on all spectral curves g ;

[0104] Repeat the above steps at least 10 times to obtain the total radiation per unit mass E of at least 10 groups of reference samples. g ; The weight and index data of the reference samples are known; in particular, the more groups of reference samples are tested, the more accurate the subsequent fitting results will be;

[0105] Get the fitted data model of the fourth-order polynomial fit of the indicator data , where: Y-index data, the total radiation per unit mass E of at least 10 groups of reference samples g Substitute the fitted data model and combine it with the indicator data to determine the coefficients a1, a2, a3, a4, and a5 in the fitted data model, and then determine the fitted data model.

[0106] The fitting data model of the indicator data includes at least:

[0107]

[0108] In the formula: Q—calorific value, unit: MJ / kg;

[0109] Eg—total radiation per unit mass of coal sample;

[0110] A, B, C, D, F are obtained using the above fitting data model; and / or

[0111]

[0112] In the formula: Ash—ash content, unit: %

[0113] Eg—total radiation per unit mass of coal sample;

[0114] a, b, c, d, and e were obtained using the above fitting data model.

[0115] It should be noted that the coal combustion spectrum detection method provided by the present invention pre-builds a model that can be applied to all types of coal samples to calculate different index data, and has strong versatility. Alternatively, in order to meet different detection requirements or ensure the accuracy of the calculation results, the user can also choose to update the fitting data model every time or at intervals, and adjust and optimize according to the actual situation, which is not limited here.

[0116] Compared with the traditional method, the calorific value and ash content of coal samples measured using the above-mentioned coal moisture infrared detection method is simpler to operate and does not require time-consuming drying and powdering steps. It shows extremely high convenience and reduces the difficulty of operation. Therefore, it effectively improves the test efficiency and can quickly obtain accurate test results in a shorter time. In addition, only a single device can achieve sample ash content, calorific value and other detections that conventional instruments cannot complete, effectively saving time and labor costs.

[0117] As attached Figure 2 As shown, in addition to the above-mentioned coal combustion spectrum detection method, the present invention also provides a coal combustion spectrum detection device based on the above-mentioned coal combustion spectrum detection method. The coal combustion spectrum detection device corresponds to the steps of the above-mentioned coal combustion spectrum detection method. The coal combustion spectrum detection device described below and the coal combustion spectrum detection method described above can be referenced to each other.

[0118] A coal combustion spectrum detection device, comprising:

[0119] The combustion container 1 has a combustion chamber 11 for burning and testing the sample, a sample combustion position 12 is arranged inside the combustion chamber 11, and an ignition device 13 is arranged in the area of ​​the top of the combustion container 1 aligned with the sample combustion position 12;

[0120] The spectrum detection unit 2 is located above the sample combustion position 12 and is used to obtain spectrum data when the sample is burning;

[0121] The oxygen supply control unit 3 is connected to the interior of the combustion chamber 11 through the air inlet 15 provided in the combustion container 1, and is used to control the oxygen supply and discharge in the combustion container 1;

[0122] The control system 4 is in communication with the spectrum detection unit 2 and the oxygen supply control unit 3, and is used to control the detection process to execute any one of the coal combustion spectrum detection methods.

[0123] In one embodiment of the present invention, the combustion chamber 11 ensures the relative independence of the combustion process and prevents interference from the external environment during detection. The spectral detection unit 2 is arranged in the combustion chamber 11 above the sample combustion position 12, and can directly capture the spectral information of the coal sample during the combustion process, and then obtain the total radiation per unit mass Eg of the coal sample. Specifically, at the beginning of the detection, a coal sample of known weight to be tested is placed on the sample combustion position 12 in the combustion chamber 11, the combustion container 1 is sealed, the control system 4 adjusts the oxygen supply control unit 3 to fill the combustion chamber 11 with oxygen, and the control system 4 starts the ignition device 13 to ignite the coal sample for combustion. While the coal sample is burning, the spectral detection unit 2 obtains the spectral data of the sample during combustion in real time, and transmits the data to the control system 4. After receiving the spectral data, the control system 4 transmits it to the computer software connected to the coal combustion spectrum detection device for analysis and processing to determine the calorific value, ash content or other index data of the coal sample. Compared with traditional devices for testing the ash content and calorific value of coal samples, this device has a simple structure and is easy to operate. It can use only a single device to realize the detection of coal sample ash content, calorific value and other tests that conventional instruments cannot complete simultaneously, effectively saving time and labor costs.

[0124] In one embodiment of the present invention, as shown in the attached Figure 3 As shown, the spectral detection unit 2 includes an optical fiber connecting line 21, an optical fiber analysis unit 22 and a plurality of optical fiber probes 23; the plurality of optical fiber probes 23 are arranged on the top of the combustion container 1 and the collection directions of the plurality of optical fiber probes 23 are all aligned with the position of the sample combustion position 12, so as to ensure that the spectral information of the flame when the coal sample is burning can be accurately collected. The plurality of optical fiber probes 23 are communicatively connected with the spectral detection unit 2 through the optical fiber connecting line 21. The optical fiber probe 23 is used to collect the spectral information of the combustion flame of the coal sample, and improve the collimation of the light beam, the coupling efficiency and the stability of the optical fiber communication system. The optical fiber connecting line 21 is used to transmit the spectral information collected by the optical fiber probe 23 to the optical fiber analysis unit 22. The optical fiber analysis unit 22 is used to extract the key features in the spectral curve such as wavelength, combustion time, etc. after analyzing the received spectral information and transmit them to the control system 4 for subsequent calculation of the index data of the coal sample.

[0125] In one embodiment of the present invention, the combustion container 1 includes a combustion cover 16 at the top and a body 17 that seals with the combustion cover 16. The body 17 and the combustion cover 16 can be combined to open or close, and combined with the combustion chamber 11 to form a closed combustion container 1. Furthermore, a sealing ring can be optionally provided between the body 17 and the combustion cover 16 to further improve the sealing effect.

[0126] In one embodiment of the present invention, a plurality of mounting holes 14 for the optical fiber probe 23 to be mounted are provided on the top of the combustion container 1, i.e., the combustion cover 16. The mounting holes 14 provide a stable mounting position for the optical fiber probe 23, ensuring that the optical fiber probe 23 will not shake during the detection process, thereby ensuring the stability of the spectrum acquisition. A lens 141 is provided in the mounting hole 14 aligned with the sample combustion position 12, which can focus the flame when the coal sample is burning, so that the flame light generated by the flame can reach the collection direction of the optical fiber probe 23 more concentratedly for information collection, and can protect the optical fiber probe 23, preventing impurities such as particulate matter and smoke generated when the coal sample is burning from entering the optical fiber probe 23 to reduce the service life of the optical fiber probe 23.

[0127] In one embodiment of the present invention, the combustion container 1 is further provided with a pressure detection element 5, which is in communication connection with the control system 4, and is used to monitor and control the pressure inside the combustion chamber 11 in real time when sealed and to feed back to the control system 4. When the pressure inside the combustion chamber 11 reaches the set value, oxygen supply to the combustion chamber 11 is stopped and the coal sample is started to be ignited. The pressure detection element 5 can prevent the abnormal pressure during the combustion of the coal sample from affecting the combustion effect and test results of the coal sample, and assist the control system 4 to control the pressure inside the combustion chamber 11 to be kept within a suitable range by adjusting the working state of the oxygen supply control unit 3 and other components according to the pressure data transmitted by the pressure detection element 5.

[0128] In one embodiment of the present invention, the oxygen supply control unit 3 includes an air intake pipeline 31 and an air outlet pipeline 32, and the air intake pipeline 31 and the air outlet pipeline 32 are both connected to the combustion chamber 11 through the air inlet 15 to control the oxygenation and degassing of the combustion chamber 11, thereby creating optimal combustion conditions for the combustion of the coal sample; the air intake pipeline 31 and the air outlet pipeline 32 are both provided with a solenoid valve 33, and the solenoid valve 33 is communicatively connected with the control system 4, thereby automatically realizing the opening or closing of the air intake pipeline 31 and the air outlet pipeline 32, thereby accurately controlling the charging and discharging of oxygen in the combustion chamber 11.

[0129] The present invention is further described in detail below in conjunction with embodiments.

[0130] Example 1 - Pre-construction of fitting data model:

[0131] (1) Reference sample n1: Place 1 mg of reference sample n1 in the sample combustion position, set the integration time to 120 s, the interval time to 100 μs, open the air intake line of the oxygen supply control unit to introduce oxygen into the combustion chamber, and close the oxygen supply control unit until the pressure detection element measures the pressure in the combustion chamber to be 0.4 MPa. Turn on the ignition device, ignite the reference sample n1 placed in the sample combustion position, and perform spectral detection on the reference sample n1 during combustion through the spectral detection unit to obtain all spectral curves of the reference sample n1 at different time periods during combustion. Based on all spectral curves and formula The total radiation E of the flame spectrum during the combustion time of the reference sample n1 is calculated to be 5.562wAU. Then, the total radiation per unit mass is calculated using the formula E g =E / m Calculate the total radiation per unit mass E of the reference sample n1 g It is 5.562wAU / g.

[0132] (2) Reference sample n2: Place 1 mg of reference sample n2 in the sample combustion position, set the integration time to 120 s, the interval time to 100 μs, open the air intake line of the oxygen supply control unit to introduce oxygen into the combustion chamber, and close the oxygen supply control unit until the pressure detection element measures the pressure in the combustion chamber to be 0.4 MPa. Turn on the ignition device, ignite the reference sample n2 placed in the sample combustion position, and perform spectral detection on the reference sample n2 during combustion through the spectral detection unit to obtain all spectral curves of the reference sample n2 at different time periods during combustion. Based on all spectral curves and formula The total radiation E of the flame spectrum during the combustion time of the reference sample n2 is calculated to be 5.986wAU. Then, the total radiation per unit mass is calculated using the formula E g =E / m Calculate the total radiation per unit mass of reference sample n2 E g It is 5.986wAU / g.

[0133] (3) Reference sample n3: Place 1 mg of reference sample n3 in the sample combustion position, set the integration time to 120 s, the interval time to 100 μs, open the air intake line of the oxygen supply control unit to introduce oxygen into the combustion chamber, and close the oxygen supply control unit until the pressure detection element measures the pressure in the combustion chamber to be 0.4 MPa. Turn on the ignition device, ignite the reference sample n3 placed in the sample combustion position, and perform spectral detection on the reference sample n3 during combustion through the spectral detection unit to obtain all spectral curves of the reference sample n3 at different time periods during combustion. Based on all spectral curves and formula The total radiation E of the flame spectrum during the combustion time of the reference sample n3 is calculated to be 6.032wAU. Then, the total radiation per unit mass is calculated using the formula E g =E / m Calculate the total radiation per unit mass E of the reference sample n3g It is 6.032wAU / g.

[0134] (4) Reference sample n4: Place 1 mg of reference sample n4 in the sample combustion position, set the integration time to 120 s, the interval time to 100 μs, open the air intake line of the oxygen supply control unit to allow oxygen to flow into the combustion chamber until the pressure detection element measures the pressure in the combustion chamber to be 0.4 MPa. Then close the oxygen supply control unit, turn on the ignition device, ignite the reference sample n4 placed in the sample combustion position, perform spectral detection on the reference sample n4 during combustion through the spectral detection unit, obtain all spectral curves of the reference sample n4 at different time periods during combustion, and calculate the value of the spectral curves based on all spectral curves and formula The total radiation E of the flame spectrum during the combustion time of the reference sample n4 is calculated to be 6.542wAU. Then, the total radiation per unit mass is calculated using the formula E g =E / m to calculate the total radiation per unit mass E of the reference sample n4 g It is 6.542wAU / g.

[0135] (5) Reference sample n5: Place 1 mg of reference sample n5 in the sample combustion position, set the integration time to 120 s, the interval time to 100 μs, open the air intake line of the oxygen supply control unit to allow oxygen to flow into the combustion chamber until the pressure detection element measures the pressure in the combustion chamber to be 0.4 MPa. Then close the oxygen supply control unit, turn on the ignition device, ignite the reference sample n5 placed in the sample combustion position, perform spectral detection on the reference sample n5 during combustion through the spectral detection unit, obtain all spectral curves of the reference sample n5 at different time periods during combustion, and calculate the value of the spectral curves based on all spectral curves and formula The total radiation E of the flame spectrum during the combustion time of the reference sample n5 is calculated to be 6.789wAU. Then, the total radiation per unit mass is calculated using the formula E g =E / m Calculate the total radiation per unit mass of reference sample n5 E g It is 6.789wAU / g.

[0136] (6) Reference sample n6: Place 1 mg of reference sample n6 in the sample combustion position, set the integration time to 120 s, the interval time to 100 μs, open the air intake line of the oxygen supply control unit to allow oxygen to flow into the combustion chamber until the pressure detection element measures the pressure in the combustion chamber to be 0.4 MPa. Then close the oxygen supply control unit, turn on the ignition device, and ignite the reference sample n6 placed in the sample combustion position. Perform spectral detection on the reference sample n6 during combustion through the spectral detection unit, and obtain all spectral curves of the reference sample n6 at different time periods during combustion. Based on all spectral curves and formula The total radiation E of the flame spectrum during the combustion time of the reference sample n6 is calculated to be 6.965wAU. Then, the total radiation per unit mass is calculated using the formula E g =E / m The total radiation per unit mass of reference sample n6 is calculated as E g It is 6.965wAU / g.

[0137] (7) Reference sample n7: Place 1 mg of reference sample n7 in the sample combustion position, set the integration time to 120 s, the interval time to 100 μs, open the air intake line of the oxygen supply control unit to allow oxygen to flow into the combustion chamber until the pressure detection element measures the pressure in the combustion chamber to be 0.4 MPa. Then close the oxygen supply control unit, turn on the ignition device, ignite the reference sample n7 placed in the sample combustion position, perform spectral detection on the reference sample n7 during combustion through the spectral detection unit, obtain all spectral curves of the reference sample n7 at different time periods during combustion, and calculate the value of the spectral curves based on all spectral curves and the formula The total radiation E of the flame spectrum during the combustion time of the reference sample n7 is calculated to be 7.653wAU. Then, the total radiation per unit mass is calculated using the formula E g =E / m The total radiation per unit mass of reference sample n7 is calculated as E g It is 7.653wAU / g.

[0138] (8) Reference sample n8: Place 1 mg of reference sample n8 in the sample combustion position, set the integration time to 120 s, the interval time to 100 μs, open the air intake line of the oxygen supply control unit to allow oxygen to flow into the combustion chamber until the pressure detection element measures the pressure in the combustion chamber to be 0.4 MPa. Then close the oxygen supply control unit, turn on the ignition device, ignite the reference sample n8 placed in the sample combustion position, perform spectral detection on the reference sample n8 during combustion through the spectral detection unit, obtain all spectral curves of the reference sample n8 at different time periods during combustion, and calculate the value of the spectral curves based on all spectral curves and the formula The total radiation E of the flame spectrum during the combustion time of the reference sample n8 is calculated to be 8.152wAU. Then, the total radiation per unit mass is calculated using the formula E g =E / m The total radiation per unit mass of reference sample n8 is calculated as E g It is 8.152wAU / g.

[0139] (9) Reference sample n9: Place 1 mg of reference sample n9 in the sample combustion position, set the integration time to 120 s, the interval time to 100 μs, open the air intake line of the oxygen supply control unit to introduce oxygen into the combustion chamber, and close the oxygen supply control unit until the pressure detection element measures the pressure in the combustion chamber to be 0.4 MPa. Turn on the ignition device, ignite the reference sample n9 placed in the sample combustion position, and perform spectral detection on the reference sample n9 during combustion through the spectral detection unit to obtain all spectral curves of the reference sample n9 at different time periods during combustion. Based on all spectral curves and formula The total radiation E of the flame spectrum during the combustion time of the reference sample n9 is calculated to be 8.289wAU. Then, the total radiation per unit mass is calculated using the formula E g =E / m The total radiation per unit mass of reference sample n9 is calculated as E g It is 8.289wAU / g.

[0140] (10) Reference sample n 10 : 1 mg of reference sample 10 Put the sample into the combustion position, set the integration time to 120s, the interval time to 100μs, open the air intake line of the oxygen supply control unit to let oxygen into the combustion chamber, and close the oxygen supply control unit when the pressure detection element measures the pressure in the combustion chamber to be 0.4Mpa, turn on the ignition device, and ignite the reference sample n placed in the sample combustion position. 10 , the reference sample n during combustion is detected by the spectral detection unit 10 Perform spectral detection and obtain reference sample n 10 All spectral curves of different time periods during combustion, based on all spectral curves and formula Calculate the reference sample n 10 The total radiation of the flame spectrum during the burning time is E8.365wAU, and the total radiation per unit mass is calculated by the formula E g =E / m calculated to obtain reference sample n 10 The total radiation per unit mass E g It is 8.365wAU / g.

[0141] (11) Reference sample n 11 : 1 mg of reference sample 11 Put the sample into the combustion position, set the integration time to 120s, the interval time to 100μs, open the air intake line of the oxygen supply control unit to let oxygen into the combustion chamber, and close the oxygen supply control unit when the pressure detection element measures the pressure in the combustion chamber to be 0.4Mpa, turn on the ignition device, and ignite the reference sample n placed in the sample combustion position. 11 , the reference sample n during combustion is detected by the spectral detection unit 11 Perform spectral detection and obtain reference sample n11 All spectral curves of different time periods during combustion, based on all spectral curves and formula Calculate the reference sample n 11 The total radiation of the flame spectrum during the burning time is 8.375wAU. Then the total radiation per unit mass is calculated by the formula E g =E / m calculated to obtain reference sample n 11 The total radiation per unit mass E g It is 8.375wAU / g.

[0142] (12) Reference sample n 12 : 1 mg of reference sample 12 Put the sample into the combustion position, set the integration time to 120s, the interval time to 100μs, open the air intake line of the oxygen supply control unit to let oxygen into the combustion chamber, and close the oxygen supply control unit when the pressure detection element measures the pressure in the combustion chamber to be 0.4Mpa, turn on the ignition device, and ignite the reference sample n placed in the sample combustion position. 12 , the reference sample n during combustion is detected by the spectral detection unit 12 Perform spectral detection and obtain reference sample n 12 All spectral curves of different time periods during combustion, based on all spectral curves and formula Calculate the reference sample n 12 The total radiation of the flame spectrum during the burning time is E8.435wAU, and the total radiation per unit mass is calculated by the formula E g =E / m calculated to obtain reference sample n 12 The total radiation per unit mass E g It is 8.435wAU / g.

[0143] Get the calorific value fitting data model , where: Q—calorific value, unit MJ / kg; and ash fitting data model , where: Ash—ash content, unit %, Substitute the total radiation per unit mass, calorific value and ash content of the above 12 groups of reference samples into the fitting data model respectively to determine the calorific value fitting data model

[0144] .

[0145] Example 2 - Detection of calorific value and ash content of coal sample GBW11105

[0146] Step S1, put 1 mg of coal sample into the sample combustion position, set the integration time to 120 s, the interval time to 100 μs, open the air intake pipeline to fill the combustion chamber with oxygen, turn on the ignition device to ignite the coal sample placed in the sample combustion position, and perform spectral detection on the coal sample during combustion through the spectral detection unit;

[0147] Step S2: Obtain all spectral curves of the coal sample at different time periods during combustion, and based on all spectral curves and formula The total radiation E of the flame spectrum during the combustion time of the coal sample is calculated to be 7.253wAU. Then, the total radiation per unit mass is calculated using the formula E g =E / m to calculate the total radiation per unit mass of the coal sample E g 7.253wAU / g;

[0148] Step S3: The total radiation per unit mass E g The fitted data model with the calorific value of 7.253

[0149] The calorific value Q of the coal sample is 22.13 MJ / kg; the total radiation per unit mass E g Substitute the fitted data model of ash content The ash content A of the coal sample was obtained sh It is 32.53%.

[0150] Table 1

[0151]

[0152] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A coal combustion spectrum detection method, characterized in that: The following steps are involved: Step S1, weighing the mass of the coal sample, igniting the coal sample and performing spectrum detection on it; Step S2, setting the integration time and interval time of the spectrum detection unit, during the combustion stage of the coal sample, controlling the spectrum detection unit to collect according to the integration time and interval time, obtaining a number of single-measurement spectrum curves, that is, obtaining all spectrum curves of different time periods during the combustion of the coal sample, and calculating the total radiation per unit mass E of the coal sample based on all spectrum curves g ; Wherein, the total radiation per unit mass E g The calculation method is: Based on the spectral curve of each single measurement, obtain the flame spectral radiation I of a single measurement λi ; Flame spectral radiation I based on the spectral curves of all time periods during the combustion stage of coal samples λi , obtain the total radiation E of the flame spectrum collected during the combustion stage of the coal sample; Calculate the total radiation per unit mass E g ,Right now Where: E g —Total radiation per unit mass E g , unit: wAU / g; E—total flame spectrum radiation collected during the combustion stage of the coal sample, unit: wAU; t1—the time when the coal sample starts to burn, in seconds; t2—combustion end time of coal sample, unit: s; 1—The lower limit of the wavelength in the spectrum curve during the combustion time of the coal sample, in nm; 2—The upper limit of the wavelength in the spectrum curve during the combustion time of the coal sample, in nm; I λi — single measurement of flame spectral radiation; m—mass of coal sample, unit: g; Step S3: The total radiation per unit mass E g Substituting them into the fitting data models of the corresponding index data, respectively, to obtain the index data of the coal samples corresponding to the fitting data models, wherein the index data at least includes calorific value and ash content; The construction of the fitting data model includes the following steps: Obtain reference sample weight and index data; Ignite the reference sample and perform spectral detection on it; Obtain all spectral curves of the reference sample during the combustion stage, and calculate the total radiation per unit mass E of the reference sample based on all spectral curves g ; Repeat the above steps at least 10 times to obtain the total radiation per unit mass E of at least 10 groups of reference samples. g ; Obtain the fitted data model for a quartic polynomial fit of the indicator data: Where: Y-index data, the total radiation per unit mass E of at least 10 groups of reference samples g Substituting the fitting data model and combining the indicator data, determining the coefficients a1, a2, a3, a4, and a5 in the fitting data model, and then determining the fitting data model; The fitting data model of the indicator data at least includes: In the formula: Q—calorific value, unit: MJ / kg; Eg—total radiation per unit mass of coal sample; A, B, C, D, and F are obtained by using the fitting data model building step; and / or In the formula: Ash—ash content, unit: % Eg—total radiation per unit mass of coal sample; a, b, c, d, and e are obtained by using the fitting data model building step.

2. A coal combustion spectrum detection device, characterized in that: include A combustion container, having a combustion chamber for burning and testing the sample, wherein a sample combustion position is arranged inside the combustion chamber, and an ignition device is arranged in the area of ​​the top of the combustion container aligned with the sample combustion position; A spectrum detection unit, located above the sample combustion position, for obtaining spectrum data when the sample is burning; An oxygen supply control unit, which is connected to the interior of the combustion chamber through an air inlet provided in the combustion container, and is used to control the charging and discharging of oxygen in the combustion container; A control system is communicatively connected with the spectrum detection unit and the oxygen supply control unit to execute the coal combustion spectrum detection method according to claim 1.

3. The coal combustion spectrum detection device according to claim 2, characterized in that: The spectrum detection unit includes an optical fiber connecting line, an optical fiber analysis unit and a plurality of optical fiber probes; Several of the fiber optic probes are arranged on the top of the combustion container and the collection directions of several of the fiber optic probes are aligned with the position of the sample combustion position. Several of the fiber optic probes are communicatively connected to the spectral detection unit through the fiber optic connecting line. The fiber optic probes are used to collect spectral information of the flame when the sample is burning. The fiber optic connecting line is used to transmit the spectral information collected by the fiber optic probes to the fiber optic analysis unit. The fiber optic analysis unit is used to analyze the received spectral information and then transmit it to the control system to calculate the index data of the coal sample.

4. The coal combustion spectrum detection device according to claim 3, characterized in that: The top of the combustion container is provided with a plurality of mounting holes for the optical fiber probe to be mounted in cooperation, and the mounting holes are provided with lenses. When the sample burns, the light source of the flame first passes through the lens and then reaches the collection direction of the optical fiber probe for spectrum collection.

5. The coal combustion spectrum detection device according to claim 2, characterized in that: The combustion container is also provided with a pressure detection element, which is communicatively connected with the control system and is used for real-time monitoring and controlling the pressure inside the combustion chamber when sealed and feeding back to the control system.

6. The coal combustion spectrum detection device according to claim 2, characterized in that: The oxygen supply control unit comprises an air inlet pipeline and an air outlet pipeline, wherein the air inlet pipeline and the air outlet pipeline are both connected to the combustion chamber through the air inlet to control the oxygenation and degassing of the combustion chamber; The air inlet pipeline and the air outlet pipeline are both provided with solenoid valves, and the solenoid valves are communicatively connected with the control system.

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