CN210954018U - On-line monitoring system for coal quality in furnace for real-time operation control - Google Patents
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Abstract
A coal quality on-line monitoring system for real-time operation control of coal as fired comprises a coal feeding belt motor, a coal feeding belt driven by the coal feeding belt motor, transported fuel coal, a sampler arranged on the coal feeding belt, a horizontal belt for distributing coal bins, a horizontal belt motor for driving the horizontal belt motor to run, a plurality of coal ploughs arranged on the horizontal belt, a coal feeder inlet coal bin, a coal quality on-line detection device for receiving coal samples produced by the sampler and analyzing the coal quality, a material level change grading correction filtering module for receiving signals of a material level sensor and correcting the material level, and a real-time coal quality calculating device for receiving signal data of each part and outputting the real-time coal quality as fired; the utility model discloses a coal quality on-line measuring device of installing on the coal feeding belt at present can obtain the online data of the income stove coal quality that satisfies real-time operation control needs, provides low-cost solution for solving the general difficult problem that the coal quality fluctuation brought, and practical value is showing.
Description
Technical Field
The utility model relates to a thermal power station automatic control technical field, concretely relates to go into stove coal quality on-line monitoring system for real-time operation control.
Background
The operating environment of the thermal power generating unit under the condition of domestic electric power marketization is obviously different from that of the foreign thermal power generating unit. Firstly, the design of coal types is influenced by reserves and coal mine marketization operation, and the stable supply of the whole life cycle of a power plant cannot be guaranteed; secondly, under the condition that the coal price is marketized but the electricity price is relatively fixed, the thermal power profit is greatly compressed, and the burning of low-quality coal or mixed coal becomes the inevitable choice of most power plants; thirdly, the coal supply chain for electric power is long, and great economic benefits drive various logistics and intermediate links to bring a great deal of uncertainty to the stable guarantee of coal quality. Due to the factors, coal quality and even frequent and large change of coal types of thermal power generating units in China generally exist.
The remarkable fluctuation of the coal quality not only affects the performance of a pulverizing system, but also causes the change of air quantity required by the combustion of unit coal quantity and the change of fuel control required by load increase and decrease, and brings great difficulty to the control of key parameters such as boiler combustion and unit steam temperature, steam pressure and the like.
Coal quality detection generally needs to cover key indexes such as ash content, moisture, fixed carbon, heat productivity and the like, and along with the improvement of environmental protection requirements, the requirement of sulfur element detection is increasingly highlighted. At present, coal quality detection of entering and feeding is mainly carried out by various factories through a method for testing coal quality by sampling, but results can be analyzed only for hours, and the characteristic time of combustion and output of a boiler is generally within 5 minutes, so that the application of coal quality parameters in real-time operation control is greatly limited.
Compared with the traditional coal chemical analysis method, the coal quality on-line detection technology can realize real-time and quick coal quality analysis, solves the problems of complex process, lagged result and the like of the traditional mining, preparation and chemical method, and is more timely and objective for production guidance. Therefore, the coal quality online detection technology is increasingly applied to the processes of coal production process control, commercial coal distribution and sale and the like, and has wide market demands. At present, a plurality of coal quality on-line monitoring devices are provided, for example, coal quality on-line monitoring devices based on detection means such as gamma rays, laser pulses, natural radiation, microwaves and the like have open application cases.
However, although the existing coal quality online detection can achieve minute-level rapid detection, the existing coal quality online detection cannot be used for real-time operation control to solve the problems of combustion and coordination control caused by coal quality fluctuation, and the main reasons are as follows:
(1) the coal quality in the furnace cannot be really and directly measured. On one hand, the coal quality detection device is expensive, and for a main stream high-power coal-fired unit with 5 to 6 coal mills, the coal quality in the furnace is directly measured on line, one online detection device needs to be configured for each coal mill, and the investment cost is too high; on the other hand, corresponding space and configuration schemes are not reserved for the inlet and the outlet of the coal mill designed by the existing typical power station to arrange sampling and online detection equipment. Therefore, the existing practical power station coal quality online detection device is installed on a coal feeding belt, so that two machine sets can share one device, the input cost is greatly reduced, but the brought direct problem is that the coal quality of the coal feeding is detected online instead of the coal quality of the coal which is burnt in a furnace in real time, a large number of conveying belts, coal ploughs, links such as raw material storage are arranged in the middle, the coal ploughs cannot be directly used for online actual operation control, and only the running personnel can refer to the coal quality online detection device within a certain range.
(2) The on-line data of the coal quality of the coal fed into the furnace is used for estimating the coal quality of the coal fed into the furnace, so that the uncertainty is large. Under the premise that the coal quality of the coal entering the furnace is difficult to directly measure, the estimation of the coal quality of the coal entering the furnace by utilizing the coal quality of the coal entering the furnace and the related conveying belt, the coal plough, the material level of the raw material bin and the like has certain feasibility theoretically, but larger uncertainty exists in practice. Through a large amount of error analysis of research and practical application, the required precision for directly using for real-time operation control mainly exists in the following aspects: a. the coal feeding belt scale is limited by the structure, so that for a long coal conveying belt, the real-time coal quantity passing through the position in real time cannot be accurately obtained, and the position of a sampling point corresponding to a coal quality detection result in a storage bin is determined so as to estimate a charging time point to bring a large error; b. the coal quality on-line detection device is not provided with an independent sampling device, but uses a sampling device originally designed for a coal conveying system, but the conventional sampling device does not calibrate the sampling time when sampling and sampling are successful, so that the prepared coal sample cannot be reversely deduced to obtain the original position of a sampling point, and the key basis for calibrating the position of the coal sample in a raw material bin is lost; c. the uncertainty of the material level measurement of the raw material bin is large. On one hand, the measurement of the material level of the raw material bin is difficult, the output of a material level measuring device mainly based on point measurement is often uncertain greatly due to collapse, pile height, vibration and the like of a material level top cross section in the bin, so that the position of a detected coal sample is difficult to accurately obtain, and the large bin cross section enables the measurement time precision of the actual coal quality change in the furnace to deviate for several minutes and exceed the precision requirement required by real-time operation control.
In summary, although various types of coal quality online detection devices have been developed at present, various factors still cannot obtain coal quality detection data required for meeting real-time operation control, so that coal quality fluctuation still puzzles most coal-fired power plant operators, and a key problem to be solved at present is urgently needed. Based on long-term collection and evaluation of relevant data, the direct economic losses incurred therefore exceed billions of dollars per year.
Disclosure of Invention
In order to solve the problems existing in the prior art, the utility model aims to provide an online monitor system for coal quality of coal entering furnace for real-time operation control, the online monitor device for coal quality installed on the coal belt at present can obtain the online data of coal quality of coal entering furnace meeting the real-time operation control needs, provides low-cost solution for solving the general difficult problem that the coal quality fluctuation brought, and practical value is showing.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an on-line monitoring system for coal quality in a furnace for real-time operation control comprises a coal feeding belt motor 4, a coal feeding belt 1 driven by the coal feeding belt motor 4, transported fuel coal 2, a sampler 3 arranged on the coal feeding belt 1, a horizontal belt 6 for distributing coal bins, a horizontal belt motor 7 for driving the horizontal belt 6 to run, a plurality of coal ploughs 5 arranged on the horizontal belt 6, a coal feeder 9, a coal feeder inlet coal bin 8, a coal quality on-line detection device 10 for receiving coal samples prepared by the sampler 3 and analyzing the coal quality, a material level change grading correction filter module 11 for receiving signals of a material level sensor arranged on the coal feeder inlet coal bin 8 and correcting the material level, a real-time coal quality in the furnace calculation device 12 for outputting the real-time coal quality in the furnace, the real-time coal quality in the furnace calculation device 12 receiving sampling time output by the sampler 3, and current signals of the coal feeding belt motor 4, The action switch signals of a plurality of coal ploughs 5, the current signal of a horizontal belt motor 7, the belt scale coal quantity signal of a coal feeder 9, the coal quality information of a coal quality on-line detection device 10, the analysis time of the coal quality information, and the filtered material level signal output by a material level change grading correction filter module 11 are output to output the real-time coal quality of entering the furnace.
The sampler 3 not only samples and prepares samples after the coal feeding belt 1 runs, but also outputs a switching value signal to the real-time coal quality calculation device 12 when grabbing the coal samples, records the time label when sampling, judges whether sampling is successful according to the time output by the coal quality on-line detection device 10 and calibrates the position of a sampling point.
By adopting the output currents of the coal feeding belt motor 4 and the horizontal belt motor 7, the instantaneous coal quantity passing through a certain section can be conveniently calculated according to the load characteristics of the motor and the physical relation between the coal conveying load and the total coal quantity on the belt, so that more accurate real-time data of the coal flow of the section can be obtained compared with a belt scale on the belt.
The device is provided with a material level change grading correction filtering module 11, so that different types of material level changes can be easily distinguished according to the magnitude of the change rate of the material level, and material level data are filtered according to different conditions, thereby properly solving errors caused by uncertainty of the material level data and realizing calibration of corresponding positions of sampled coal quality.
In the real-time coal quality calculating device 12, the sampling time output by the sampling machine 3, the current signal of the coal belt feeding motor 4, the action switch signals of the coal ploughs 5, the current signal of the horizontal belt motor 7, the belt scale coal quantity signal of the coal feeder 9, the coal quality information of the coal on-line detecting device 10, the analysis time of the coal quality information, and the filtered material level signal output by the material level change grading correction filter module 11 are used as input, and the approximate position of the analyzed coal sample in the whole system can be positioned according to the material transfer sequence and flow of the target system process design in the coal flow transmission process and Newton's law, so that the movement of the calibration positions is monitored, the coal quality moved to the coal feeder 9 is output finally, and the real-time coal quality information entering the furnace is obtained.
The on-line monitoring method of the on-line monitoring system for the coal quality of the coal entering the furnace for real-time operation control is characterized in that based on a current signal of the coal feeding belt motor 4, the change of the coal quantity carried on the coal feeding belt 1 is calculated according to an asynchronous motor load characteristic curve in the specification of the coal feeding belt motor 4 or a common fitting curve of an asynchronous motor in electrical engineering and the mechanical balance relation determined by the Newton's law of the coal conveying load and the total coal quantity on the coal feeding belt 1, so that the change of the instantaneous coal quantity passing through the cross section where the sampling machine 3 is located along with the time is calculated according to the position of the sampling machine 3 on the coal feeding belt 1;
the time of each sampling of the sampler 3 plus the time of the sampling, sample preparation and analysis processes of the coal quality on-line detection device 10 is fixed, so that whether the sampling time of the sampler 3 is successfully sampled can be reversely deduced by the time of the output result of each coal quality on-line detection device 10, if the interval time exceeds the preset range of the fixed time, the corresponding sampling is considered to be unsuccessful in obtaining the coal sample, and meanwhile, if the coal sample is successfully obtained, the coal quality of the analysis result can be calibrated to the sampling position of the coal flow;
the horizontal belt motor 7 aligns the coal flow of the coal feeding belt 1 with the coal flow of the horizontal belt 6 in time from the moment when the starting current starts to increase, namely the moment when the corresponding coal flow starts to fall into the horizontal belt 6, so that the coal quality information calibration point is accurately calibrated on the horizontal belt 6;
the material level change grading correction filtering module 11 can distinguish different types of material level changes according to the magnitude order of the change rate of the material level of the coal bunker 8 at the coal feeder inlet; aiming at the material level change of the coal feeding type and the initial position thereof, the coal flow of the coal feeding belt 1 is aligned with the material level of the coal bunker 8 at the inlet of the coal feeder in time, so that the coal quality information calibration point is accurately calibrated on the material level of the coal bunker 8 at the inlet of the coal feeder; aiming at the material level change caused by the abnormal conditions of the vibration of the coal bunker 8 at the inlet of the coal feeder and the collapse of the material level surface, the linear change filtering of a new section of material level information is carried out according to the calibrated material level point after the previous abnormal change, so that the material level measurement uncertainty caused by the abnormal change is eliminated as accurately as possible; the position of the coal quality information calibration point corresponding to the material level of the coal bunker 8 at the coal feeder inlet can be updated according to the material level change caused by the coal feeder 9, so that the coal quality entering the coal feeder 9 at the current moment is obtained.
Compared with the prior art, the utility model discloses possess following advantage:
1. the coal quality in the furnace can be obtained in real time under the condition that the coal quality on-line detection device 10 is arranged on the coal feeding belt 1, and the requirement of on-line control on the coal quality precision is met;
2. the current of a belt motor is used for assisting the measurement of the coal quantity, so that the problem of real-time measurement accuracy of a belt scale installed on a long belt is solved;
3. the sampling time output by the sampler 3 is utilized to obtain the accurate position of the coal quality measurement result, so that the coal quality measurement result obtained by the coal quality on-line monitoring device 10 can accurately correspond to the real-time coal flow position, and a foundation is laid for obtaining the coal quality of the coal as fired;
4. the problem of high uncertainty of ubiquitous material level measurement is solved through the graded correction filtering module 11 of material level change, and the calibration position precision corresponding to the coal quality measurement result is effectively improved.
Drawings
Fig. 1 is a schematic diagram of the system structure of the present invention.
In the figure: 1-a coaling belt; 2-fuel coal; 3-a sampler; 4-coal belt motor; 5-coal plough; 6-horizontal belt; 7-horizontal belt motor; 8-coal feeder inlet bunker; 9-coal feeder; 10-coal quality on-line detection device; 11-a material level change graded correction filtering module; 12-real-time coal quality calculating device.
Detailed Description
As shown in FIG. 1, the utility model relates to a coal quality on-line monitoring system of entering stove for real-time operation control, including by the coal feeding belt motor 4, the coal feeding belt 1 that coal feeding belt motor 4 drove, the fuel coal 2 of carrying, install the sampler 3 on the coal feeding belt, carry out the horizontal belt 6 of coal bunker distribution after belt and distributor at all levels, drive its moving horizontal belt motor 7, install a plurality of coal ploughs 5 on horizontal belt 6, coal feeder 9, coal feeder entry coal bunker 8, receive the coal sample that the sampler 3 made and be used for coal quality analysis's coal quality on-line measuring device 10, receive the material level sensor signal of installing on coal feeder entry coal bunker 8 and be used for the material level change classification correction filter module 11 of material level correction, receive each partial signal data and be used for exporting the real-time coal quality of entering stove 12 of entering stove, each partial signal data includes the sampling moment of sampler 3 output, The current signal of the coal feeding belt motor 4, the action switch signals of the coal ploughs 5, the current signal of the horizontal belt motor 7, the belt balance coal quantity signal of the coal feeder 9, the coal quality information of the coal quality on-line detection device 10, the analysis time of the coal quality information, and the filtered material level signal output by the material level change grading correction filtering module 11.
The sampler 3 not only samples and prepares samples after the coal feeding belt 1 runs, but also outputs a switching value signal to the real-time coal quality calculation device 12 when grabbing the coal samples, records the time label when sampling, judges whether sampling is successful according to the time output by the on-line coal quality detection device 10 and calibrates the position of a sampling point.
Because the coal feeding belt is long, the weight of any point on the belt can reflect the reading change of the belt weigher, and the belt weigher cannot accurately reflect the real-time coal quantity passing through a certain section and can only be used for counting the total coal quantity. Therefore, the on-line monitoring system for the coal quality of the coal entering the furnace for real-time operation control adopts the output currents of the upper coal belt motor 4 and the horizontal belt motor 7, and can easily calculate the instantaneous coal quantity passing through a certain section according to the load characteristics of the motor and the physical relation between the coal conveying load and the total coal quantity on the belt, so that real-time data of the coal flow of the section, which is more accurate than that of a belt scale on the belt, can be obtained.
According to a large amount of data analysis, the change of the material level can be classified into three types according to the data characteristics: (1) when the coal feeder 9 is operated, the material level can slowly drop along with the continuous coal feeding, and the material level change rate is lowest in the situation and only drops but does not rise; (2) when coal is supplied, when the corresponding coal plough 5 acts, a large amount of coal on the horizontal belt 6 quickly falls into the coal bunker 8 at the inlet of the coal feeder, so that the material level is continuously and quickly increased, and the material level change rate is high and can only be reduced and not increased; (3) in order to prevent coal blockage, a rapping device is installed on the coal bunker, the shape of the top of the material level can be changed during rapping, and for most material level meters, the reading can be changed rapidly.
Therefore, from a large amount of data and research analysis, the three types of level changes exhibit significant differences in the rate of change, which are orders of magnitude differences. Therefore the utility model is used for real-time operation control's income stove coal quality on-line monitoring system disposes material level change and corrects filtering module 11 in grades, according to the order of magnitude of change rate of material level, distinguishes the material level change of different grade type very easily, carries out filtering to the material level data to the different situation to properly solve the higher error that arouses of material level data uncertainty, realize the demarcation to the sample coal quality corresponding position.
In the real-time coal quality calculating device 12, the sampling time output by the sampling machine 3, the current signal of the coal belt feeding motor 4, the action switch signals of the coal ploughs 5, the current signal of the horizontal belt motor 7, the belt scale coal quantity signal of the coal feeder 9, the coal quality information of the coal quality on-line detecting device 10, the analysis time of the coal quality information, and the filtered material level signal output by the material level change grading correction filter module 11 are used as input, and the approximate position of the analyzed coal sample in the whole system can be positioned according to the material transfer sequence and flow of the target system process design in the coal flow transmission process and the Newton's law, so that the movement of the calibration positions is easily monitored, the coal quality moved to the coal feeder 9 is output finally, and the real-time coal quality information entering the furnace can be obtained.
The online monitoring method for the coal quality of the coal as fired for real-time operation control is characterized in that based on a current signal of a coal feeding belt motor 4, the change of the coal quantity carried on a coal feeding belt 1 can be easily calculated according to an asynchronous motor load characteristic curve in the specification of the coal feeding belt motor 4 or an asynchronous motor common fitting curve in electrical engineering and by combining a mechanical balance relation determined by Newton's law of coal conveying load and the total coal quantity on the coal feeding belt 1, so that the change of the instantaneous coal quantity passing through the cross section where a sampling machine 3 is located along with the time can be calculated according to the position of the sampling machine 3 on the coal feeding belt 1.
According to the method for monitoring the coal quality in the furnace on line for real-time operation control, the sampling time of the sampling machine 3 at each time is fixed together with the time of the sampling and sample preparation process and the analysis process of the coal quality on-line detection device 10, so that whether the sampling time of the sampling machine 3 is successfully sampled or not can be reversely deduced according to the time of the output result of each coal quality on-line detection device 10, if the interval time exceeds a fixed time and is within a certain range, the corresponding sampling is not successfully obtained, and meanwhile, if the coal sample is successfully obtained, the coal quality of the analysis result can be calibrated to the sampling position of the coal flow.
The time when the current of the horizontal belt motor 7 increases from the starting current level corresponds to the time when the coal flow begins to fall into the horizontal belt, so that the coal flow of the coal feeding belt and the coal flow of the horizontal belt are aligned in time, and the coal quality information calibration point is accurately calibrated on the horizontal belt 7.
The level change grading correction filter module 11 can easily distinguish different types of level changes according to the magnitude order of the change rate of the level of the coal at the coal feeder inlet coal bunker 8. Aiming at the material level change of the coal feeding type and the initial position of the material level change, the coal flow of the coal feeding belt 1 and the material level of the coal bunker 8 at the inlet of the coal feeder can be aligned in time, so that the coal quality information calibration point is accurately calibrated on the material level of the coal bunker 8 at the inlet of the coal feeder; aiming at the material level change caused by abnormal conditions such as rapping of a coal bunker 8 at the inlet of the coal feeder, collapse of the surface of the material level and the like, carrying out linear change filtering on a new section of material level information according to a calibrated material level point after the previous abnormal change, thereby eliminating the uncertainty of material level measurement caused by the abnormal change as accurately as possible; and updating the position of the coal quality information calibration point corresponding to the material level of the coal bunker 8 at the coal feeder inlet aiming at the material level change caused by the coal feeder 9, so as to obtain the coal quality entering the coal feeder 9 at the current moment.
Claims (1)
1. The utility model provides a coal quality on-line monitoring system that goes into stove for real-time operation control which characterized in that: comprises a coal feeding belt motor (4), a coal feeding belt (1) driven by the coal feeding belt motor (4), fuel coal (2) conveyed, a sampler (3) arranged on the coal feeding belt (1), a horizontal belt (6) for distributing coal bins, a horizontal belt motor (7) for driving the horizontal belt (6) to run, a plurality of coal ploughs (5) arranged on the horizontal belt (6), a coal feeder (9) and a coal feeder inlet coal bin (8), a coal quality on-line detection device (10) connected with the sampler (3) and used for receiving coal samples produced by the sampler (3) for coal quality analysis, a material level change grading correction filter module (11) connected with a material level sensor on the coal feeder inlet coal bin (8) and used for receiving material level sensor signals and correcting material level, a material level change grading correction filter module (11) connected with the sampler (3), a coal feeding belt motor (4), a plough (5), The real-time coal quality entering calculation device (12) is connected with the horizontal belt motor (7), the coal feeder (9), the coal quality on-line detection device (10) and the material level change grading correction filter module (11), and the real-time coal quality entering calculation device (12) is used for receiving sampling time output by the sampler (3), receiving current signals of the coal feeding belt motor (4), receiving action switch signals of the coal ploughs (5), receiving current signals of the horizontal belt motor (7), receiving belt scale coal quantity signals of the coal feeder (9), receiving coal quality information and analysis time of the coal quality on-line detection device (10), receiving filtered material level signals output by the material level change grading correction filter module (11) and outputting real-time coal quality entering into the furnace.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554164A (en) * | 2019-10-09 | 2019-12-10 | 华电莱州发电有限公司 | On-line monitoring system and method for coal quality in furnace for real-time operation control |
| CN113050419A (en) * | 2021-03-03 | 2021-06-29 | 华电莱州发电有限公司 | Closed loop system identification method based on slope response and known time lag and considering feedforward |
| CN115724150A (en) * | 2022-10-21 | 2023-03-03 | 华能国际电力股份有限公司上海石洞口第二电厂 | Precise coal type confirmation system established on digital twin system and applying RFID (radio frequency identification) label |
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2019
- 2019-10-09 CN CN201921693903.7U patent/CN210954018U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554164A (en) * | 2019-10-09 | 2019-12-10 | 华电莱州发电有限公司 | On-line monitoring system and method for coal quality in furnace for real-time operation control |
| CN110554164B (en) * | 2019-10-09 | 2024-03-19 | 华电莱州发电有限公司 | On-line monitoring system and method for in-furnace coal quality for real-time operation control |
| CN113050419A (en) * | 2021-03-03 | 2021-06-29 | 华电莱州发电有限公司 | Closed loop system identification method based on slope response and known time lag and considering feedforward |
| CN113050419B (en) * | 2021-03-03 | 2022-11-08 | 华电莱州发电有限公司 | Closed loop system identification method based on slope response and known time lag and considering feedforward |
| CN115724150A (en) * | 2022-10-21 | 2023-03-03 | 华能国际电力股份有限公司上海石洞口第二电厂 | Precise coal type confirmation system established on digital twin system and applying RFID (radio frequency identification) label |
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