CN112834484B - Method and device for rapidly testing coal quality components of coal-fired power plant on line - Google Patents

Method and device for rapidly testing coal quality components of coal-fired power plant on line Download PDF

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CN112834484B
CN112834484B CN202011645554.9A CN202011645554A CN112834484B CN 112834484 B CN112834484 B CN 112834484B CN 202011645554 A CN202011645554 A CN 202011645554A CN 112834484 B CN112834484 B CN 112834484B
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王智化
何勇
倪奇
朱燕群
周志军
刘建忠
张彦威
杨卫娟
岑可法
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Zhejiang University ZJU
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Abstract

The invention relates to a coal quality measurement technology, and aims to provide a method and a device for quickly testing coal quality components of a coal-fired power plant on line. The method comprises the following steps: extracting coal powder from a coal powder pipeline of a coal-fired power plant, separating and trapping coal powder particles by using a cyclone separator, and uniformly mixing the coal powder particles and the coal powder particles to form two parts; measuring the moisture, ash content, volatile matter content and fixed carbon content of a part of the pulverized coal through industrial analysis based on temperature programmed weighing measurement; measuring the concentration of C, H, O, N, S element in another part of the coal powder through element analysis based on laser-induced breakdown spectroscopy; and combining the two measurement results to calculate and obtain the heat value of the fire coal. The invention can simultaneously realize the measurement of the moisture, ash content, volatile matter, fixed carbon content and C, H, O, N, S element concentration of the coal-fired power plant, and is beneficial to realizing the real-time monitoring and the operation parameter adjustment of the coal-fired power plant; the invention can obtain more accurate and reliable coal-fired heat value calculation results, thereby realizing continuous on-line coal-fired heat value analysis of the coal-fired power plant.

Description

Method and device for rapidly testing coal quality components of coal-fired power plant on line
Technical Field
The invention relates to the technical field of coal quality measurement, in particular to on-line rapid measurement of coal quality components of a coal-fired intelligent power plant.
Background
In coal quality evaluation indexes of coal-fired power plants, the moisture, ash content, volatile components, sulfur content, nitrogen content and heat value of coal are key indexes. Wherein, moisture can influence the transportation is stored with the fire coal calorific value, and volatile component influences the stable burning of boiler, and the ash content not only can exert an influence to the fire coal calorific value, also can influence the slagging scorification of boiler, stain, the wearing and tearing condition etc. and the sulphur content in the coal is the main source that coal fired power plant sulfur dioxide discharged, and nitrogen content influences the emission of nitrogen oxide in the flue gas, and the two all can cause environmental pollution, and the fire coal calorific value can influence power generation cost and boiler efficiency.
At present, two methods are mainly used for measuring the calorific value of coal:
one is to directly use the element analysis result of the coal to calculate the heat value, and estimate the heat value by measuring the element content of C, H, O, S and the like; however, due to the influence of moisture in coal, etc., it is not accurate enough to calculate the calorific value by simply using the results of elemental analysis. For example, chinese patent application CN 107389608A discloses online utilization of LIBS laser-induced spectroscopy in coal quality detection, which proposes to perform coal quality detection by LIBS laser-induced spectroscopy, analyze and model the obtained spectral data by using principal component-based partial least squares regression (PCA-PLS), and obtain coal sample parameters such as carbon content, hydrogen content, sulfur content, volatile matter, and calorific value of coal by calculation. However, the method can only obtain element components, and the volatile components and the ash content are fitted through a model and are not directly measured, so that the error is large; in addition, the most important moisture cannot be obtained, and the obtained element components cannot be converted into standard values such as an empty basis, an accepted basis, a dry ash-free basis and the like required by standard coal quality analysis.
The other method is that the industrial analysis result of the coal is directly utilized to calculate the heat value, the water content, the ash content and the volatile content in the coal are required to be measured by utilizing the industrial analysis result of the coal, the time consumption required by the measurement is long, and the precision of the calculation result is influenced by the type of the coal.
In view of the fact that the change and fluctuation of coal quality evaluation indexes directly influence the operation efficiency, safety and economic benefit of a power plant, the real-time online measurement and analysis of coal quality plays a crucial role in a coal-fired power plant, and the method has important significance for quickly and accurately measuring the moisture, ash content, volatile matter, sulfur content, nitrogen content, heat value and the like of coal.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provides a method and a device for quickly testing the coal quality components of a coal-fired power plant on line.
In order to solve the technical problem, the solution of the invention is as follows:
the method for rapidly testing the coal quality components of the coal-fired power plant on line comprises the following steps:
(1) extracting coal powder from a coal powder pipeline of a coal-fired power plant, separating and trapping coal powder particles by using a cyclone separator, and uniformly mixing the coal powder particles and the coal powder particles to form two parts;
(2) measuring the moisture, ash content, volatile matter content and fixed carbon content of a part of the pulverized coal through industrial analysis based on temperature programmed weighing measurement;
(3) the concentration of C, H, O, N, S elements, respectively denoted as C, in another portion of the pulverized coal was measured by elemental analysis based on LIBSar，LIBS，Har，LIBS，Oar，LIBS，Nar，LIBS，Sar，LIBS；
(4) And (3) combining the industrial analysis result of the step (2) and the element analysis result of the step (3) to calculate and obtain the heat value of the fire coal.
In the present invention, the step (2) specifically includes:
(2.1) weighing coal powder with the initial mass m, placing the coal powder in a furnace body heating system, controlling the temperature in the furnace to be 105-110 ℃, and drying in a dry nitrogen flow until the mass is constant; obtaining the mass m of the coal sample1Calculating the mass fraction of water, water Mar＝(m-m1)/m*100；
(2.2) maintaining the nitrogen atmosphere, raising the temperature in the furnace to 900 +/-10 ℃, and heating for 7 min; obtaining the mass m of the coal sample2Calculating to obtain the mass fraction of volatile component, volatile component Var＝(m1-m2)/m*100；
(2.3) maintaining a nitrogen atmosphere, cooling to 815 +/-10 ℃, switching to an air atmosphere, and burning at the temperature of 815 +/-10 ℃ until the mass is constant; according to the mass m of the residual coal sample3Calculating the mass fraction of ash, ash Aar＝m3/m*100；
(2.4) calculating the mass fraction of the fixed carbon according to the mass fractions of moisture, ash and volatile matters contained in the coal powder with the initial mass m: fixed carbon FCar＝100-(Mar+Aar+Var)。
In the present invention, the step (3) specifically includes:
(3.1) pressing the coal powder into a coal cake with a smooth surface by using a mechanical hydraulic tablet press, and placing the coal cake on a rotating platform of an element analysis and measurement system;
(3.2) Nd: a laser beam emitted by the YAG solid laser is focused by a focusing lens and then is irradiated on the surface of a coal cake in a rotating state to generate plasma; the light receiver collects light signals emitted by the plasma in the cooling and attenuation processes, transmits the light signals to the spectrometer and the detector through optical fibers, and transmits spectral line information obtained through processing to the computer;
(3.3) calculating the peak area integral of the spectral line by using Matlab software, and calculating by adopting a spectral correction method of local spectral normalization and plasma temperature compensation to obtain the spectral line intensity of the element to be measured; and substituting the spectral line intensity of the element to be measured into a calibration curve equation, and calculating the concentration of the element to be measured.
In the invention, in the step (3), when the C, H, O, N, S element in the pulverized coal is qualitatively and quantitatively analyzed, data processing is performed by an internal standard method to weaken the matrix effect, the selected internal standard element is Si, and the characteristic spectral line adopted by the element C, H, O, N, S, Si is as follows:
C：193.09nm，247.856nm；H：656.272nm；O：747.908nm，729.631nm，407.7715nm；N：460.716nm，742.364nm；S：866.649nm，868.046nm，903.262nm，547.8194nm；Si：288.1579nm。
in the invention, in the step (4), the coal-fired heat value is calculated by adopting a Mendeleev's heat value calculation formula:
calorific value Qnet，ar＝339Car+1030Har-109(Oar-Sar)-25Mar
Wherein Q isnet，arLow calorific value of the coalar＝Car，LIBS，
Figure BDA0002878379380000031
Sar＝Sar，LIBS，Nar＝Nar，LIBS，Oar＝100-Mar-Aar-Car-Har-Nar-Sar。
The invention further provides a device for realizing the coal quality and composition online rapid test of the coal-fired power plant, which comprises a coal powder acquisition system, an industrial analysis and measurement system and an element analysis and measurement system; wherein the content of the first and second substances,
the coal powder collecting system comprises a cyclone separator and an air pump, wherein the cyclone separator is used for collecting coal powder particles, the cyclone separator is connected with a coal powder pipeline of a coal-fired power plant and the air pump through a pipeline, and coal powder airflow extracted from the coal powder pipeline by the air pump enters the cyclone separator through the pipeline for gas-solid separation;
the industrial analysis and measurement system comprises a furnace body heating system, a program temperature control system, an atmosphere control system, a weighing and measuring system and a data processing system; the program temperature control system is connected to an electric heating device in the furnace body heating system through a cable, and the atmosphere control system is connected to the nitrogen pipeline and the electric control valve on the air pipeline through a cable; the weighing and metering system is connected to a computer through a signal wire so as to transmit weighing data to a data processing system arranged in the computer;
the element analysis and measurement system comprises a mechanical hydraulic tablet press, a solid laser, a spectrometer, a detector, a time schedule controller, a focusing lens and a rotary platform; the mechanical hydraulic tablet press is used for pressing the coal powder into a coal cake with a smooth surface; after passing through a focusing lens, the laser emitted by the solid laser is aligned to a briquette to be measured on a rotating platform; the light collector facing the briquette to be detected is connected with the spectrograph and the detector through optical fibers, and the detector is connected with a computer through a signal wire; and the time schedule controller is respectively connected with the detector and the solid laser through signal lines and is used for controlling the working time schedule of the detector and the solid laser.
Description of the inventive principles:
according to the regulations of GB 212-2008 'coal industrial analysis method', the temperature and the atmosphere in the furnace body are controlled by the programmed temperature control system and the atmosphere control system, the quality of the pulverized coal is monitored in real time by the weighing and measuring system, and the measurement and calculation of the moisture, the ash content, the volatile matter and the fixed carbon of the pulverized coal are realized by adjusting the temperature and the atmosphere in the furnace.
Laser-induced breakdown spectroscopy (LIBS) is an atomic emission spectrum used for qualitative and quantitative analysis of elements, can be used for solid, liquid and gaseous samples, can realize synchronous analysis of various elements, has low requirements on pretreatment of the samples, and has high analysis speed. The invention relates to an element analysis and measurement system based on laser-induced breakdown spectroscopy, which adopts the actions of laser and a sample to generate plasma and detects atomic spectrum information emitted in the processes of cooling and attenuating the plasma, thereby realizing the detection of the types and the contents of elements in the sample. The obtained spectrum can be analyzed by combining an internal standard method, so that qualitative and quantitative analysis of C, H, O, N, S elements in the coal cake can be realized.
The coal quality online measurement method combining the industrial analysis based on the programmed heating weighing measurement with the element analysis based on the laser-induced breakdown spectroscopy can realize the online analysis of the water content, ash content, volatile content, fixed carbon content, C, H, O, N, S and other element concentrations of coal, and can also quickly calculate to obtain the heat value of the fire coal, so that basic data is provided for the realization of an intelligent power plant, the operation parameters of the power plant can be conveniently adjusted in real time, the combustion efficiency of a boiler is improved, the pollutant emission is controlled, and the economic benefit of the power plant is improved.
In the traditional measurement technology, a thermogravimetric method has no way of directly obtaining a heat value, and only an off-line bomb heating quantity measurement method is adopted to measure the water temperature change after oxygen is introduced for combustion. General idea hopes to use all the spectrum method, but it is difficult to deduct the interference of moisture, H and O elements in ash, and traditional thermogravimetry can only get industrial analysis, such as macroscopic quantities of moisture, ash, volatile matter, etc. Different from the prior art, the invention can realize on-line real-time measurement and combines the advantages of the laser spectroscopy and the thermogravimetry. This has the advantage that a thermogravimetric method with small slow macroscopic changes can be coupled with a spectroscopic method for fast detection, which can quickly reflect coal quality changes and calorific value changes.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can simultaneously realize the measurement of the moisture, ash content, volatile component, fixed carbon content and C, H, O, N, S element concentration of the coal, and is beneficial to realizing the real-time monitoring and the operation parameter adjustment of the coal-fired power plant;
2. the coal quality measuring method of the coal-fired power plant based on the combination of the industrial analysis of the coal and the element analysis based on the laser-induced breakdown spectroscopy not only exerts the advantages of the online rapid measurement of the laser-induced breakdown spectroscopy, but also enables the calculation result of the heat value of the coal-fired to be more accurate and reliable by combining the result of the industrial analysis, thereby realizing the continuous online analysis of the heat value of the coal-fired power plant.
Drawings
FIG. 1 is a flow chart of a measurement system method of the present invention;
FIG. 2 is a schematic view of an on-line measurement system of the present invention;
FIG. 3 is a schematic diagram of an elemental analysis measurement system based on laser-induced breakdown spectroscopy according to the present invention;
FIG. 4 is a schematic diagram of an industrial analytical measurement system based on temperature programmed weighing metering according to the present invention;
reference numerals: 1-a cyclone separator; 2-an air pump; 3-a mechanical hydraulic tablet press; 4-an elemental analysis measurement system; 5-an industrial analytical measurement system; 6-Nd: a YAG solid laser; 7-a focusing lens; 8-briquette; 9-rotating the platform; 10-a light receiver; 11-an optical fiber; 12-a spectrometer; 13-a time schedule controller; 14-a detector; 15-a computer; 16-a programmed temperature control system; 17-an atmosphere control system; 18-furnace body heating system; 19-a weighing and metering system; 20-a data processing system.
Detailed Description
It should be noted that the present invention relates to data processing technology, and for example, a data processing system is a software functional module built in a computer. The program temperature control system and the atmosphere control system can be control equipment assembled by using hardware parts, and can also be a software functional module which is arranged in a computer and plays a role of replacing hardware control. The applicant believes that it is fully possible for one skilled in the art to utilize the software programming skills in his or her own practice to implement the invention, as well as to properly understand the principles and objectives of the invention, in conjunction with the prior art, after a perusal of this application.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
FIG. 1 is a flow chart of a measurement system method of the present invention, comprising the steps of:
step 101, extracting coal powder from a coal powder pipeline of a coal-fired power plant, and separating and collecting a coal powder sample by using a cyclone separator;
102, sending a part of the collected coal dust sample to an industrial analysis and measurement system based on temperature programming weighing measurement;
103, sending a part of the collected coal dust sample into an element analysis and measurement system based on laser-induced breakdown spectroscopy;
104, measuring the moisture, ash content, volatile matter and fixed carbon of the pulverized coal by using an industrial analysis measuring system based on programmed heating weighing measurement;
105, performing qualitative and quantitative analysis on C, H, O, N, S and other elements in the coal cake by using an element analysis and measurement system based on a laser-induced breakdown spectroscopy method and combining an internal standard method;
and step 106, estimating the heat value of the fire coal by combining a heat value calculation empirical formula.
Fig. 2 is a schematic diagram of an on-line measuring system of the present invention, which mainly includes a cyclone separator 1, an air pump 2, a mechanical hydraulic tablet press 3, an elemental analysis measuring system 4, and an industrial analysis measuring system 5. Collecting pulverized coal by a pulverized coal flow extracted from a pulverized coal pipeline of a coal-fired power plant through a cyclone separator 1, pressing part of the collected pulverized coal into a briquette with a smooth surface through a mechanical hydraulic tablet press 3, and then sending the briquette to an element analysis and measurement system 4 based on laser-induced breakdown spectroscopy to perform qualitative and quantitative analysis on elements in the coal; and the other part of the pulverized coal is sent to an industrial analysis and measurement system 5 based on temperature programming weighing measurement for industrial analysis, and the moisture, ash content, volatile matter and fixed carbon of the pulverized coal are measured.
The elemental analysis and measurement system based on the laser-induced breakdown spectroscopy mainly comprises a mechanical hydraulic tablet press 3 and an elemental analysis and measurement system 4. Fig. 3 is an elemental analysis measurement system based on a laser-induced breakdown spectroscopy method, which mainly includes Nd: YAG solid laser 6, focusing lens 7, briquette 8, rotary platform 9, light receiver 10, optical fiber 11, spectrometer 12, time sequence controller 13, detector 14 and computer 15. Nd: a laser beam emitted by a YAG solid laser 6 is focused by a focusing lens 7 and then is irradiated on the surface of a coal cake 8 arranged on a rotary platform 9 to generate plasma, optical signals emitted in the processes of cooling and attenuating the plasma are collected by an optical receiver 10 and transmitted to a spectrometer 12 and a detector 14 through an optical fiber 11, and the signals are transmitted to a computer 15 for processing.
In the element analysis and measurement system 4 based on laser-induced breakdown spectroscopy, the mechanical hydraulic sample preparation pressure is controlled to be 20-35MPa, so that the compactness of a sample is ensured; the quality of the sample is controlled to be 2-10g, and the die of the hydraulic tablet press is a cylindrical die; the energy of the solid laser 6 is controlled between 30 and 100 mJ/pulse, so that the atomic spectral line with higher intensity is ensured to be obtained, and the plasma shielding effect can be avoided as much as possible; the pulse frequency of the solid laser 6 is 1-10Hz, the output wavelength is 532nm or 355nm, and the 532nm and 355nm laser has high photon energy and strong ionization; the laser focus point is positioned 1-3mm below the surface of the coal cake 8 so as to improve the measurement repeatability; the delay time of the spectrometer 12 is controlled to be 0.5-2 mus after the laser pulse, so that a better signal-to-noise ratio can be obtained; the measurement range of the spectrometer 12 is 191-950nm, so that the element C, H, O, N, S can be detected simultaneously; the measurement is carried out in the argon or helium atmosphere, so that the fluctuation of a spectral signal is favorably reduced; the rotating speed of the rotating platform 9 is controlled to be 1-5rpm, so that repeated laser impact on the same point on the surface of the sample is avoided.
When the method is used for qualitatively and quantitatively analyzing C, H, O, N, S elements in the coal cake, an internal standard method is selected for data processing to weaken the matrix effect, the selected internal standard element is Si, and characteristic spectral lines adopted by the element C, H, O, N, S, Si are shown in Table 1.
TABLE 1
Element(s) Characteristic spectral line (nm)
C 193.09，247.856
H 656.272
O 747.908，729.631，407.7715
N 460.716nm，742.364nm
S 866.649，868.046，903.262，547.8194
Si 288.1579
According to the invention, the peak area integral of a spectral line is calculated by utilizing Matlab software, and the spectral line intensity of the element to be measured is calculated by adopting a spectral correction method of local spectral normalization and plasma temperature compensation. When C, H, O, N, S element is quantitatively analyzed, firstly, a calibration curve equation between the concentration of the element to be measured and the spectral line intensity ratio of the element to be measured and Si element is established by using a sample with known concentration of the element to be measured as an abscissa and the spectral line intensity ratio of the element to be measured and Si element as an ordinate. After the calibration curve equation is obtained, the element analysis and measurement system 4 is used for detecting a sample to be measured with unknown concentration, and the spectral line intensity of the element to be measured is brought into the calibration curve equation, so that the concentration of the element to be measured can be calculated.The measured concentrations of C, H, O, N, S elements, respectively denoted Car，LIBS，Har，LIBS，Oar，LIBS，Nar，LIBS，Sar，LIBS。
Fig. 4 is a schematic diagram of an industrial analysis and measurement system based on temperature programmed weighing metering according to the present invention, which mainly includes a temperature programmed control system 16, an atmosphere control system 17, a furnace body heating system 18, a weighing metering system 19, and a data processing system 20. The pulverized coal is placed in a furnace body heating system 18, the temperature of the furnace body is adjusted through a program temperature control system 16, the atmosphere in the furnace is adjusted through an atmosphere control system 17, the pulverized coal is heated, the mass of the pulverized coal is measured in real time through a weighing and metering system 19, and data are input into a data processing system 20 arranged in a computer.
In the industrial analysis and measurement system based on programmed heating weighing metering, the industrial analysis method of coal is as follows: weighing coal powder with mass m, placing the coal powder in a furnace body heating system 18, introducing dry nitrogen in advance through an atmosphere control system 17, controlling the temperature in the furnace to be 105-fold and 110 ℃ by using a program temperature control system 16, and drying the coal powder in the dry nitrogen flow to be constant in mass m1According to the mass loss m-m of the coal sample1Calculating the mass fraction of the water; maintaining nitrogen atmosphere, heating the furnace to 900 +/-10 ℃ for 7 min; obtaining the mass m of the coal sample2According to mass loss m1-m2Calculating to obtain the mass fraction of the volatile component; maintaining nitrogen atmosphere, cooling to 815 + -10 deg.C, switching to air atmosphere, and burning at 815 + -10 deg.C to constant mass m3Calculating to obtain the mass fraction of ash; and finally, calculating the mass fraction of the fixed carbon based on mass balance.
Moisture content: mar＝(m-m1)/m*100
Volatile components: var＝(m1-m2)/m*100
Ash content: a. thear＝m3/m*100
Fixing carbon: FCar＝100-(Mar+Aar+Var)
Wherein M isar，Aar，Var，FCarThe mass fractions of the moisture, ash, volatile matter and fixed carbon of the coal sample are respectively, and m is the corresponding initial mass of the coal powder. Fixed carbon mass fraction FCarCalculated by the mass fractions of moisture, ash and volatile matter.
The coal-fired heat value calculation empirical formula is a Mendeleev heat value calculation empirical formula, C, H, O, N, S element concentration is obtained by utilizing an element analysis and measurement system based on laser-induced breakdown spectroscopy, and the coal moisture content M is obtained by an industrial analysis and measurement system based on programmed heating weighing measurementarAnd calculating to obtain the heat value of the fire coal as an input value of the formula.
Calorific value Qnet，ar＝339Car+1030Har-109(Oar-Sar)-25Mar
Wherein Q isnet，arLow calorific value of the coalar＝Car，LIBS，
Figure BDA0002878379380000071
Sar＝Sar，LIBS，Nar＝Nar，LIBS，Oar＝100-Mar-Aar-Car-Har-Nar-Sar。
The method has the advantages that the industrial analysis result of the coal and the analysis result of elements such as C, H, O, N, S in the coal are combined at the same time, so that the heat value of the fire coal can be obtained quickly, and the repeatability and the accuracy of the measurement of the heat value of the fire coal are improved; through the element analysis measurement system based on laser-induced breakdown spectroscopy and the industrial analysis measurement system based on programmed heating weighing measurement, the rapid measurement of moisture, ash content, volatile matter, sulfur content, nitrogen content, heat value and the like of coal is realized, and basic data are provided for the realization of a smart power plant.
Therefore, the invention provides two methods of combining programmed heating method industrial analysis and LIBS element analysis of coal, the element analysis is utilized to accurately obtain the content of elements such as C, H, O, N, S in the coal, the accurate moisture and ash content obtained by combining the industrial analysis can be used for correcting the measured result of the measured elements after the influence of the moisture and ash content is deducted, the accurate dry ash-free base data can be obtained, more accurate heat value can be obtained, and the industrial analysis result is consistent with the coal quality analysis required by the national standard.
The foregoing description illustrates the general principles of the invention, its essential features and advantages, and should not be taken as limiting the scope of the invention. The principles and features of this invention have been described in the foregoing specification only and it is to be understood that numerous changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (2)

1. A coal-fired power plant coal quality component on-line rapid testing method is characterized by comprising the following steps:
(1) extracting coal powder from a coal powder pipeline of a coal-fired power plant, separating and trapping coal powder particles by using a cyclone separator, and uniformly mixing the coal powder particles and the coal powder particles to form two parts;
(2) measuring the moisture, ash content, volatile matter content and fixed carbon content of a part of the pulverized coal through industrial analysis based on temperature programmed weighing measurement; the method specifically comprises the following steps:
(2.1) weighing the initial massmThe pulverized coal is placed in a furnace body heating system, the temperature in the furnace is controlled to be 105-110 ℃, and the pulverized coal is dried in dry nitrogen flow until the quality is constant; obtaining the quality of the coal samplem 1Calculating the mass fraction of water, waterM ar =(m-m 1)/m×100；
(2.2) maintaining the nitrogen atmosphere, heating the temperature in the furnace to 900 +/-10 ℃ for 7 min; obtaining the quality of the coal samplem 2Calculating to obtain the mass fraction of the volatile componentV ar =(m 1-m 2)/m×100；
(2.3) maintaining a nitrogen atmosphere, and cooling to 815 +/-10 ℃; switching to air atmosphere, and burning at 815 +/-10 ℃ until the quality is constant; according to the mass of the residual coal samplem 3Calculating the mass fraction of ash contentA ar =m 3/m×100；
(2.4) starting from the initial massmThe mass fraction of the water, ash and volatile components contained in the pulverized coal is calculated to obtain the mass fraction of the fixed carbon: fixed carbonFC ar =100 -( M ar +A ar +V ar )；
(3) The C, H, O, N, S element concentration in another portion of the pulverized coal was measured by elemental analysis based on laser-induced breakdown spectroscopy, respectively denoted asC ar,LIBS ，H ar,LIBS ，O ar,LIBS ，N ar,LIBS ，S ar,LIBS (ii) a The method specifically comprises the following steps:
(3.1) pressing the coal powder into a coal cake with a smooth surface by using a mechanical hydraulic tablet press, and placing the coal cake on a rotating platform of an element analysis and measurement system;
(3.2) focusing a laser beam emitted by a YAG solid laser through a focusing lens, and then striking the laser beam on the surface of the coal cake in a rotating state to generate plasma; the light receiver collects light signals emitted by the plasma in the cooling and attenuation processes, transmits the light signals to the spectrometer and the detector through optical fibers, and transmits spectral line information obtained through processing to the computer;
(3.3) calculating the peak area integral of the spectral line by using Matlab software, and calculating by adopting a spectral correction method of local spectral normalization and plasma temperature compensation to obtain the spectral line intensity of the element to be measured; substituting the spectral line intensity of the element to be measured into a calibration curve equation, and calculating the concentration of the element to be measured;
(4) and (3) calculating the heat value of the fire coal by adopting a Mendeleev's heat value calculation formula by combining the industrial analysis result of the step (2) and the element analysis result of the step (3):
calorific value Q net, ar = 339C ar +1030H ar - 109(O ar - S ar ) - 25M ar
Wherein Q is net, ar For the low-grade calorific value of the received coal,C ar = C ar,LIBS ，H ar = H ar,LIBS - M ar ﹒2/(2+16)，
S ar = S ar,LIBS ，N ar = N ar,LIBS ，O ar = 100 - M ar - A ar - C ar - H ar - N ar - S ar 。
2. the method according to claim 1, wherein in the step (3), when qualitative and quantitative analysis is performed on C, H, O, N, S element in the pulverized coal, data processing is performed by an internal standard method to reduce matrix effect, the selected internal standard element is Si, and characteristic spectral lines adopted by element C, H, O, N, S, Si are as follows:
C：193.09 nm，247.856 nm；H：656.272 nm；O：747.908 nm，729.631 nm，407.7715 nm；N：460.716nm，742.364nm；S：866.649 nm，868.046 nm，903.262 nm，547.8194 nm；Si：288.1579 nm。
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