CN203053892U - Coal quality online monitoring system based on natural gamma spectral analysis and used for coal-fired power plant - Google Patents
Coal quality online monitoring system based on natural gamma spectral analysis and used for coal-fired power plant Download PDFInfo
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- CN203053892U CN203053892U CN 201220578872 CN201220578872U CN203053892U CN 203053892 U CN203053892 U CN 203053892U CN 201220578872 CN201220578872 CN 201220578872 CN 201220578872 U CN201220578872 U CN 201220578872U CN 203053892 U CN203053892 U CN 203053892U
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Abstract
The utility model relates to a coal quality online monitoring system based on natural gamma spectral analysis and used for a coal-fired power plant. The coal quality online monitoring system comprises a natural gamma energy spectrum measuring system and a coal quality identification system, wherein the natural gamma energy spectrum measuring system comprises a natural gamma measuring probe, a signal amplifier as well as a spectrum stabilizing control system and an electric pulse analysis system which are connected with the signal amplifier, and the spectrum stabilizing control system and the electric pulse analysis system are connected with the coal quality identification system by virtue of data interfaces. A coal quality online monitoring method comprises the following steps of: identifying a type of charged coal and components of the charged coal according to natural gamma radiation characteristic of the charged coal measured in real time and a coal quality and natural gamma radiation characteristic sample library, and calculating parameters of the coal quality. The coal quality online monitoring system can rapidly, accurately and continuously monitor the coal quality of the fire-coaled power plant on line and can meet the real-time monitoring requirement of an automatic control system on the parameters of the coal quality under the conditions of obvious change of the coal quality of the fire-coal power plants and coal blending combustion in China at present.
Description
Technical field
The present invention relates to coal-fired thermal power generation observation and control technology field, be specifically related to a kind of fired power generating unit and go into stove ature of coal on-line monitoring system.
Background technology
Because the coal-fired marketization of generating, the coal supply of power plant is difficult to assurance and uses design coal always, the supply coal class of most thermal power plants is various, the ature of coal fluctuation is bigger, the phenomenon of ubiquity coal mixing combustion, this automatic control to genset brings great difficulty, especially for the overcritical and high-power unit of ultra supercritical of modern times, and the performance that the instability of ature of coal has seriously restricted unit control and regulated.The ature of coal of going into the stove burning is carried out real-time on-line monitoring, is an urgent demand of boiler combustion adjustment and unit cooperative control.
At present, the ature of coal on-line monitoring technique mainly is divided into five big classes, is example with existing relevant patent both at home and abroad, and major technique adopts X ray, gamma-rays, light analysis, indirect calculation and sampling combustion analysis method respectively.Wherein precision higher be most widely used be based on X ray and gamma-ray analytical approach, these two class methods all adopt radioactive source to send radiant rays the coal sample are analyzed, harmful, therefore generally all in closed container, analyze in the mode of sampling, can not realize online continuous monitoring.Also there are same problem in sampling burning and most of light analytical approach, and this also is the main bottleneck of present ature of coal on-line continuous monitoring technology.
Nature γ radiation is different with active γ radiation and X-radiation, refer to the radiant rays that the inner primary denier radioelement of natural minerals sends, be extensively to exist in natural rock, earth, also claim the natural gamma radiation, it is the part of physical environment background radiation, therefore, based on the not additional any harmful radioactive ray of the equipment that detects nature γ radiotechnology, harmless.
The nature gamma-rays mainly comprises uranium series, actinium series, thorides and K40 (potassium), Rb87 (rubidium) etc. from natural radioactive element.Generally all contain the radioelement of varying number in rock and the clay, and constantly emit gamma-rays.The energy of that different elements is emitted is different, K40 can only send the gamma-rays of 1.46MeV, the most of gamma-rays of thorium family is distributed in below the 1.3MeV, at the 2.62MeV place obvious peak value is arranged, uranium series has the gamma-rays of various energy, major part all is distributed in below the 1.3MeV, at the 1.76MeV place obvious peak value is arranged.
What of the content of radioelement in the stratum are by the parent rock that contains radioelement, through long-term geologic function, constantly separate and redistribute and form.It is relevant with the type of rock, sedimentary environment, handling process, diagenesis epigenesis, rate of decay etc. factor, like this, we just can be by measuring the relative content of various radioelement in the rock, and release above-mentioned each factor, thereby be applied to the exploratory development in oil field and colliery.
Oil and coal are explored the gamma-ray logging of industrial extensive employing, general three window methods that adopt, namely catch the gamma intensity of 1.46MeV, 1.76MeV and 2.62MeV characteristic energy, find the solution the ratio of K40, uranium series and thorides content, thereby be used for seeking the position in petroliferous rock stratum or definite coal seam.
In addition, because not containing radioelement in fixed carbon in the coal and the volatile matter, therefore for the coal of same ash content composition, natural γ radiation intensity is proportional to the content of ash content in the coal, and its linear standard deviation can reach 0.6-1.3%.This is used to the pit ash instrument, by the correction in advance to the colliery sample, adopts the Ash analyser measurement nature γ radiation intensity of this principle to detect pit ash on the interior coal of dump, train or automobile bodies and the travelling belt.But the measurement of this ash content only is confined to the coal in same coal seam or same colliery, and the coal of China power station burning at present exists ature of coal to be changed significantly and the situation of a large amount of coal mixing combustions, therefore, adopt the Ash analyser of this technology can't be directly used in the on-line monitoring of power station ature of coal.
Above information shows, existing gamma-rays coal quality monitoring technology is in closed container, and the radiation gamma coal sample that adopts radioactive source to send absorbs the monitoring that gamma-emitting different qualities carries out ature of coal according to each composition in the coal; The exploration that existing nature γ radiation detection is used for coal and oil is to adopt the γ radiation intensity of three kinds of characteristic frequencies easy to identify to be used for the lithology on auxiliary judgment stratum, assist searching coal seam and oil reservoir according to the variation of radiation intensity, be a kind of in many well loggings, do not use separately, need to carry out geologic prospecting in conjunction with other type (sound, electricity etc.) well logging by the method for manual analysis; The existing natural γ radiation detection that is applied to raw coal is used for carrying out the estimation of the single coal ash content that the colliery produces by the natural γ radiation intensity that detects coal, and only the single coal to default is effective, can't obtain other ature of coal parameter.
Summary of the invention
In order to solve the problem that existing ature of coal on-line monitoring technique exists, the object of the present invention is to provide a kind of thermal power plant's ature of coal on-line monitoring system based on the natural gamma analysis of spectrum, the ature of coal to thermal power plant that can be quick, accurate, continuous is carried out on-line monitoring, satisfy that present China general ature of coal of thermoelectricity is changed significantly and the coal mixing combustion condition under automatic control system to the real-time monitoring requirement of ature of coal parameter.
To achieve these goals, the present invention is by the following technical solutions:
A kind of thermal power plant's ature of coal on-line monitoring system based on the natural gamma analysis of spectrum comprises natural measuring system and coal quality identification system 10;
Described natural measuring system, comprise the anti-cosmic radiation interferometry district that is wrapped in lead metal floor 3 formation of certain-length on the coal-fired transfer passage of thermal power plant, the natural measuring sonde 4 of the collection nature γ radiation ray of installing in radiation proof interferometry district, the signal amplifier 5 that is connected with natural measuring sonde 4, spectrum stabilization control system 6 and electric pulse analytic system 7;
The input end of described spectrum stabilization control system 6 is connected with natural measuring sonde 4, output terminal is connected with coal quality identification system 10 by data-interface 8, adopt built-in temperature correction curve that the amplification coefficient of natural measuring sonde 4 is carried out coarse adjustment, and carry out fine tuning according to typical radioactive element characteristic energy, guarantee the output accuracy of nature γ measuring sonde 4;
The input end of described electric pulse analytic system 7 is connected with signal amplifier 5, and output terminal is connected with coal quality identification system 10 by data-interface 8, and the electric impulse signal with signal amplifier transmits divides a plurality of energy windows to carry out step-by-step counting according to pulse height;
The input end of described coal quality identification system 10 is connected with spectrum stabilization control system 6 and electric pulse analytic system 7 respectively by data-interface 8, the control system of output terminal and power plant is connected, according to electric pulse analytic system 7 each energy window counted number of pulses, obtain the proper vector of the natural γ radiation spectrum of target coal dust, in demarcating each good typical ature of coal nature γ radiation spectrum proper vector storehouse in advance, go into the identification of the coal component of stove coal based on the principle that minimizes nature γ radiation spectrum proper vector deviation, and adopt the computing method of following formula (1) to calculate thermal value into the stove coal according to the ature of coal parameter of each typical coal, volatile matter, ash content and moisture.
M in the formula
ObjThe thermal value of going into the stove coal, volatile matter, ash content or water parameters that expression is asked; M
iThermal value, volatile matter, ash content or the water parameters of representing the i component corresponding with asking parameter; α
iThe shared mass percent of i component that the expression identification is come out; N is the typical coal quantity of the tested coal of composition that comes out of identification.
Described natural measuring sonde 4 is made up of low potassium NaI crystal and photomultiplier, is installed on the transfer passage sidewall of coal dust.
The monitoring method of thermal power plant's ature of coal on-line monitoring system based on the natural gamma analysis of spectrum described above, at first, the natural measuring sonde 4 that the part nature gamma-rays that the contained radioelement of ash content is constantly emitted in the coal of carrying in the coal-fired transfer passage 12 is installed on the channel side wall absorbs, and is converted to electric signal and delivers to signal amplifier 5 and amplify the back outputs and can and deliver to electric pulse analytic system 7 for the electric impulse signal of pulse analysis; Meanwhile, spectrum stabilization control system 6 is by being installed on natural measuring sonde 4 temperature inside sensors, obtain temperature signal, according to the built-in temperature correction curve of spectrum stabilization control system 6 amplification coefficient of natural measuring sonde 4 is carried out coarse adjustment, and carry out fine tuning according to typical radioactive element characteristic energy, guarantee the output accuracy of natural measuring sonde 4; Subsequently, electric pulse analytic system 7 is according to a plurality of energy windows that arrange, the corresponding energy pulses that receives is counted, and be to carry out the preservation of count results the cycle and pass to coal quality identification system 10 with the Δ t time, subsequently, coal quality identification system 10 is the cycle with the Δ t time, the count results of n interior each energy window of Δ t time before the statistics current time, generate and measure ature of coal nature γ radiation feature coding, the INTELLIGENT IDENTIFICATION algorithm of coal quality identification system 10 inside makes up the feature coding of known coal, and with the actual measurement feature coding compare, until minimizing nature γ radiation spectrum proper vector output bias, identification draws the mixing proportion α of each typical coal
i, with reference to thermal value, volatile matter, ash content and the moisture of each coal sample, according to mixing thermal value, volatile matter, ash content and the moisture of the tested fire coal of formula (1) calculating, the control system of electric power supply plant is used accordingly.
The core measuring method that the present invention is based on thermal power plant's ature of coal on-line monitoring system of natural gamma analysis of spectrum mainly has very similarly geologic function such as diagenesis, sedimentary environment, handling process and rate of decay geographically based on the coal-fired ore bed environment from same mineral resources or same mining area, so the proportion of composing of its contained natural radioactive element is very similar.Do not contain this class natural radioactive element in coal-fired fixed carbon and the volatile matter, but the ash content in the fire coal then contains the radioactive composition of this proportion of composing.The natural γ radiation characteristic of the corresponding coal-fired ash content of different geological characteristics shows as the difference of radiant energy distribution in the nature γ radiation spectrum, and this is used to identify the coal of separate sources.Because the coal-fired ubiquity blending that power plant supplies with and the situation of coal mixing combustion, ature of coal on-line monitoring method of the present invention is by setting up burning coal nature γ radiation frequency spectrum feature and corresponding ature of coal parameter sample storehouse thereof, the radiant energy distribution error minimize is target in the employing mixed coal nature γ radiation spectrum, pick out the blending component of each known coal by parameter identification method, thereby go into stove ature of coal parameter according to the ature of coal calculation of parameter in sample storehouse is actual.
Compared with prior art, measuring method of the present invention adopts based on adopting the identification of coal nature γ radiation spectrum characteristic to go into stove coal and blending component thereof, thereby realizes for the on-line monitoring of going into stove ature of coal parameter.The method that statistics adopt is slided in data analysis adopts n Δ t time as the count cycle of adding up, but is exportable result of calculation every the Δ t time, has also improved response speed in the raising analysis precision.This system hardware does not contain any radioactive source, to human body and environmental nonpollution, can be installed on the existing coal-fired transport path (feeder travelling belt, coal pulverizer outlet, tube cell etc.), analyze in real time important ature of coal parameters such as the coal burning caloricity of sending into boiler combustion, ash content, volatile matter, moisture incessantly, the automatic control of power plant's steady load is had great importance.
Description of drawings
Fig. 1 is the thermal power plant's ature of coal on-line monitoring that the present invention is based on natural gamma analysis of spectrum and parameter identification technique
The composition structural drawing of system.
Fig. 2 is the thermal power plant's ature of coal on-line monitoring that the present invention is based on natural gamma analysis of spectrum and parameter identification technique
The FB(flow block) of method.
Embodiment
The present invention will be described in more detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, a kind of thermal power plant's ature of coal on-line monitoring system based on the natural gamma analysis of spectrum of the present invention, comprise the natural measuring system, the spectrum stabilization control system 6 that is connected with the natural measuring system and electric pulse analytic system 7, described spectrum stabilization control system 6 is connected with coal quality identification system 10 by data-interface 8 with electric pulse analytic system 7, wherein: carry out two-way communication by telecommunication cable 9 and data-interface 8 between spectrum stabilization control system 6, pulse analysis system 7 and the coal quality identification system 10; Described natural measuring system comprises the radiation proof interferometry district of lead metal floor 3 formation that are wrapped in certain-length on thermal power plant's coal dust transfer passage 1, the natural measuring sonde 4 of the collection nature γ radiation ray of installing in radiation proof interferometry district, natural measuring sonde 4 is made up of low potassium NaI crystal and photomultiplier, be installed on the transfer passage sidewall of coal dust the signal amplifier 5 that is connected with natural measuring sonde 4; The input end of described spectrum stabilization control system 6 is connected with natural measuring sonde 4, output terminal is connected with coal quality identification system 10 by data-interface 8, because it is serious that the amplification coefficient of photomultiplier varies with temperature drift, spectrum stabilization control system 6 utilizes the high voltage of photomultiplier to regulate real-time spectrum stabilization control, the amplification coefficient of control photomultiplier, this control system is not used the radioactive reference source of common employing, but adopt the temperature correction curve of photoelectric tube amplification coefficient to implement coarse adjustment, to avoid radioactive contamination and danger, the temperature sensor that is configured in the photomultiplier place is measured the working temperature of photomultiplier in real time, because the temperature variation of thermoelectricity ature of coal measurement environment is very slow, and variation range is narrower, therefore possess the control accuracy requirement of coarse adjustment based on the temperature drift curve of demarcating in advance, it is accurately controlled and accurately adjusts in conjunction with the characteristic energy peak value of radioelement in the tested coal dust; The input end of described electric pulse analytic system 7 is connected with signal amplifier 5, and output terminal is connected with coal quality identification system 10 by data-interface 8, and the electric impulse signal with signal amplifier transmits divides a plurality of energy windows to carry out step-by-step counting according to pulse height; The input end of described coal quality identification system 10 is connected with spectrum stabilization control system 6 and electric pulse analytic system 7 respectively by data-interface 8, the control system of output terminal and power plant is connected, coal quality identification system 10 accepts data and sending controling instruction by telecommunication cable 9, according to electric pulse analytic system 7 each energy window counted number of pulses, obtain the natural γ radiation feature vector of target coal dust, carry out the identification of target coal dust component according to default typical ature of coal proper vector group, determine the component of each coal, and in demarcating each good typical ature of coal nature γ radiation spectrum proper vector storehouse in advance, go into the identification of the coal component of stove coal based on the principle that minimizes nature γ radiation spectrum proper vector deviation, and go into the thermal value of stove coal according to the ature of coal calculation of parameter of each typical coal, volatile matter, ash content and moisture.
As depicted in figs. 1 and 2, the monitoring method of a kind of thermal power plant's ature of coal on-line monitoring system based on the natural gamma analysis of spectrum of the present invention, at first, the natural measuring sonde 4 that the part gamma-rays that the contained radioelement of ash content is constantly emitted in the coal of carrying in the coal dust transfer passage 12 is installed on the channel side wall absorbs, and is converted to electric signal and delivers to signal amplifier 5 and amplify the back outputs and can and deliver to electric pulse analytic system 7 for the electric impulse signal of pulse analysis; Meanwhile, spectrum stabilization control system 6 is by being installed on natural measuring sonde 4 temperature inside sensors, obtain temperature signal, according to the built-in temperature correction curve of spectrum stabilization control system 6 amplification coefficient of natural measuring sonde 4 is carried out coarse adjustment, and carry out fine tuning according to typical radioactive element characteristic energy, guarantee the output accuracy of natural measuring sonde 4; Subsequently, electric pulse analytic system 7 is according to a plurality of energy windows that arrange, the corresponding energy pulses that receives is counted, and be to carry out the preservation of count results the cycle and pass to coal quality identification system 10 with the Δ t time, subsequently, coal quality identification system 10 is the cycle with the Δ t time, the count results of n interior each energy window of Δ t time before the statistics current time, generate and measure ature of coal nature γ radiation feature coding, the INTELLIGENT IDENTIFICATION algorithm of coal quality identification system 10 inside makes up the feature coding of known coal, and with the actual measurement feature coding compare, until minimizing nature γ radiation spectrum proper vector output bias, identification draws the mixing proportion α of each typical coal
i, with reference to thermal value, volatile matter, ash content and the moisture of each coal sample, according to mixing thermal value, volatile matter, ash content and the moisture of the tested fire coal of formula (1) calculating, the control system of electric power supply plant is used accordingly.
The specific implementation method of system of the present invention is by arranging the energy window W more than three in pulse analysis system 7
i, (i〉3), and to falling into each energy window W
iElectric pulse carry out counting in the preset time length Δ t, count results is the cycle to send into the coal quality identification system with the Δ t time.Identification system is slided and to be chosen interior count results of continuous n Δ t time the natural γ radiation spectrum distribution character of tested fire coal is carried out feature coding, by can only the parameter identification algorithm feature coding of known coal being made up, and with the actual measurement feature coding compare, until minimizing output error, identification draws the mixing proportion of each known coal, accordingly with reference to the thermal value of each coal sample and mixing thermal value and other ature of coal parameter of the grey tested fire coal of ature of coal calculation of parameter that grades.Because time count cycle Δ t is more long, the measuring accuracy of count results reflection is more high, but is also strengthened measuring period.
Claims (2)
1. the thermal power plant's ature of coal on-line monitoring system based on the natural gamma analysis of spectrum is characterized in that: comprise natural measuring system and coal quality identification system (10);
Described natural measuring system, the radiation proof interferometry district that comprises lead metal floor (3) formation of certain-length on the transfer passage that is wrapped in thermal power plant's coal dust, the natural measuring sonde (4) of the collection nature γ radiation ray of installing in radiation proof interferometry district, the signal amplifier (5) that is connected with natural measuring sonde (4), spectrum stabilization control system (6) and electric pulse analytic system (7);
The input end of described spectrum stabilization control system (6) is connected with natural measuring sonde (4), and output terminal is connected with coal quality identification system (10) by data-interface (8);
The input end of described electric pulse analytic system (7) is connected with signal amplifier (5), output terminal is connected with coal quality identification system (10) by data-interface (8), electric impulse signal with signal amplifier transmits divides a plurality of energy windows to carry out step-by-step counting according to pulse height;
The input end of described coal quality identification system (10) is connected with spectrum stabilization control system (6) and electric pulse analytic system (7) respectively by data-interface (8), and the control system of output terminal and power plant is connected.
2. on-line monitoring system according to claim 1, it is characterized in that: described natural measuring sonde (4) is made up of low potassium NaI crystal and photomultiplier, is installed on the coal-fired transfer passage.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103730173A (en) * | 2013-11-26 | 2014-04-16 | 北京智崴科技发展有限公司 | Method for judging sources of fission products in nuclear power plant reactor letdown pipelines |
| CN104198503A (en) * | 2014-08-19 | 2014-12-10 | 开封市测控技术有限公司 | Online coal ash content measurement system and method based on natural gamma rays |
| CN111896561A (en) * | 2020-07-20 | 2020-11-06 | 中国石油化工股份有限公司 | Online passive ash content detecting system of raw material coal |
| CN112834289A (en) * | 2021-03-03 | 2021-05-25 | 安徽理工大学 | Continuous sampling-detecting-sample returning device of online ash meter |
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2012
- 2012-11-05 CN CN 201220578872 patent/CN203053892U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730173A (en) * | 2013-11-26 | 2014-04-16 | 北京智崴科技发展有限公司 | Method for judging sources of fission products in nuclear power plant reactor letdown pipelines |
| CN103730173B (en) * | 2013-11-26 | 2016-08-17 | 北京智崴科技发展有限公司 | A kind of judge to let out under nuclear power plant reactor the method in fission product source in pipeline |
| CN104198503A (en) * | 2014-08-19 | 2014-12-10 | 开封市测控技术有限公司 | Online coal ash content measurement system and method based on natural gamma rays |
| CN111896561A (en) * | 2020-07-20 | 2020-11-06 | 中国石油化工股份有限公司 | Online passive ash content detecting system of raw material coal |
| CN112834289A (en) * | 2021-03-03 | 2021-05-25 | 安徽理工大学 | Continuous sampling-detecting-sample returning device of online ash meter |
| CN112834289B (en) * | 2021-03-03 | 2024-05-24 | 安徽理工大学 | Continuous sampling-detecting-sample returning device of online ash meter |
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