CN103727530A - System and method for monitoring oxygen at furnace exit of circulating fluidized bed boiler - Google Patents
System and method for monitoring oxygen at furnace exit of circulating fluidized bed boiler Download PDFInfo
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- CN103727530A CN103727530A CN201310685302.2A CN201310685302A CN103727530A CN 103727530 A CN103727530 A CN 103727530A CN 201310685302 A CN201310685302 A CN 201310685302A CN 103727530 A CN103727530 A CN 103727530A
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Abstract
The invention discloses a system and method for monitoring oxygen at the furnace exit of a circulating fluidized bed boiler. The system comprises a coal feeding quantity detecting device used for detecting the quantity of coal entering the boiler from a furnace entrance, an air volume detecting device used for detecting the total air volume supplied to the boiler, a coal calorific value measuring device used for measuring the calorific value of the coal fed into the boiler, and a data processing device used for figuring out the oxygen at the furnace exit by utilization of the coal feeding quantity, the total air volume and the calorific value of the coal, so as to perform accurate and well dynamic monitoring on the oxygen at the furnace exit.
Description
Technical field
The present invention relates to a kind of furnace outlet oxygen amount monitoring system and method for supervising of boiler, particularly, relate to a kind of furnace outlet oxygen amount monitoring system and method for supervising of CFBB.
Background technology
Flue gas oxygen content (being furnace outlet oxygen amount) is saved the energy, is safeguarded that the burning of boiler economy is an important thermal parameter for power plant, it and excess air coefficient have functional relation, it directly reflects the coal-air ratio of boiler combustion process, significant to combustion economization.Flue gas oxygen content is too high or too low, all can cause the waste of the energy, therefore will be limited in a rational scope.
The oxygen sensor of measuring at present boiler smoke oxygen content is mainly Thermomagnetic type oxygen quantity sensor and zirconia oxygen quantity sensor, and it exists following problem:
(1) fault rate is high, major failure comprise that ash cutting, stifled ash, platinum electrode are poisoning or peel off come off, electric heater damage etc.
(2) certainty of measurement is low, the impact that leaked out by the precision of sensor own, Oxygen Amount in Flue Gas skewness, installation place, and certainty of measurement is difficult for assurance, and composition error is large.
(3) poor dynamic, zirconia oxygen analyzer utilizes concentration cell principle and carries out work, and oxygen molecule has a process of osmosis in zirconia dielectric, and this process of osmosis causes the hysteresis of measurement; In order to reduce ash cutting, on many oxygen amount meter probes, install ceramic protective casing additional, but increased again the possibility of stifled ash and the hysteresis quality of measurement so simultaneously.
(4) maintenance, maintenance, verification difficulty.
Also exist in addition cost high, reaction speed is slow, is unfavorable for the in-service monitoring of process and the shortcomings such as the required feedback signal of line closed loop control are provided.
Thereby cannot carry out exactly furnace outlet oxygen amount, monitoring that dynamic is good.
Summary of the invention
The object of this invention is to provide a kind of furnace outlet oxygen amount monitoring system of CFBB, the monitoring that this system can be carried out exactly furnace outlet oxygen amount, dynamic is good.
To achieve these goals, the invention provides a kind of furnace outlet oxygen amount monitoring system of CFBB, this system comprises: coal-supplying amount checkout gear, for detection of the coal-supplying amount that enters described boiler from burner hearth entrance; Wind volume detector, for detection of the total blast volume that is supplied to described boiler; Coal measurement of caloric value device, for measuring the coal calorific value of sending into described boiler; And data processing equipment, for according to described coal-supplying amount, described total blast volume and described coal calorific value, calculate the furnace outlet oxygen amount of described boiler.
The present invention also provides a kind of furnace outlet oxygen amount method for supervising of CFBB, and the method comprises: detect the coal-supplying amount that enters described boiler from burner hearth entrance; Detection is supplied to the total blast volume of described boiler; The coal calorific value of described boiler is sent in measurement; And according to the furnace outlet oxygen amount of boiler described in described coal-supplying amount, described total blast volume and described coal calorific value calculation.
The present invention is supplied to coal-supplying amount, total blast volume and the coal calorific value of boiler by detection, then according to these parameters, calculate the furnace outlet oxygen of boiler, so as to realize to furnace outlet oxygen amount accurately, the good monitoring of dynamic.
Other features and advantages of the present invention are described in detail the specific embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for description, is used from explanation the present invention, but is not construed as limiting the invention with the specific embodiment one below.In the accompanying drawings:
Fig. 1 is according to the structured flowchart of the furnace outlet oxygen amount monitoring system of the CFBB of embodiment of the present invention;
Fig. 2 is according to the structured flowchart of the coal-supplying amount checkout gear of embodiment of the present invention;
Fig. 3 is according to the structured flowchart of the PLC controller of embodiment of the present invention; And
Fig. 4 is according to the connection diagram between the furnace outlet oxygen amount monitoring system each several part of the CFBB of embodiment of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, the specific embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
Fig. 1 is according to the structured flowchart of the furnace outlet oxygen amount monitoring system of the CFBB of embodiment of the present invention.As shown in Figure 1, this system comprises coal-supplying amount checkout gear 11, for detection of the coal-supplying amount that enters boiler from burner hearth entrance; Wind volume detector 12, for detection of the total blast volume that is supplied to boiler; Coal measurement of caloric value device 13, for measuring the coal calorific value of sending into boiler; And data processing equipment 10, for according to coal-supplying amount, total blast volume and coal calorific value, calculate the furnace outlet oxygen amount of boiler.
According to the embodiment of the present invention, can be according to calculating the furnace outlet oxygen amount of boiler with drag:
Fire carbon amount model:
Furnace outlet oxygen signal model:
Wherein, Yo
2for furnace outlet oxygen amount, %; B (t) is the i.e. combustion carbon amount in t moment, and unit is kg; PM (t) is the total blast volume in t moment, and unit is m
3/ s; K is model overall coefficient; H is the unit caloric value of fuel, i.e. coal calorific value, and unit is MJ/kg; F (t) is the coal-supplying amount that the t moment enters boiler from burner hearth entrance, kg/s; Klo
2for oxygen amount model coefficient; L is air quantity correction coefficient; W is unit load, and unit is MW.According to equation (1), (2) and (3), calculate furnace outlet oxygen amount.
Wherein, firing carbon amount is the coal amount of instant burning, and model overall coefficient, oxygen amount model coefficient are that inventor obtains through many experiments, and air quantity correction coefficient can obtain according to the measurement of for example anemobiagraph.
According to the embodiment of the present invention, coal-supplying amount checkout gear 11 can be installed under the conveying and metering adhesive tape of feeder.As shown in Figure 2, coal-supplying amount checkout gear 11 can comprise for detection of input to boiler coal weight LOAD CELLS 20 and for detection of carrying coal to the velocity sensor 21 of the speed of the belt of boiler.This coal-supplying amount checkout gear 11 can also comprise integrator 22 and communication module 23, the coal weight detecting and the speed of belt can be transferred into integrator 22, by integrating, obtain instantaneous delivery and the cumulative amount of coal, then pass through communication module 23 coal-supplying amount (coal-supplying amount average per second drawing as calculated) is sent to data processing equipment 10.But the present invention is not restricted to this, as, the coal weight detecting and the speed of belt can also directly be sent to data processing equipment 10, it is processed by data processing equipment 10.
According to the embodiment of the present invention, Wind volume detector 12 comprises multiple air volume meters in the exit of the primary air fan, overfire air fan and the fluidized air blower that are placed in CFBB, measures in real time the total blast volume of sending into boiler by the plurality of air volume meter.
According to the embodiment of the present invention, data processing equipment 10 can be PLC controller, and this PLC controller can adopt Siemens S7400 series redundant PLC to form two-node cluster hot backup, to improve the stability of whole system.As shown in Figure 3, PLC controller 30 can comprise CPU31, AD converter 34, algorithm memory 32, PID adjuster 33 and I/O communication controller 35.Wherein AD converter 34, algorithm memory 32 and PID adjuster 33 are all connected with CPU31, and I/O communication controller is connected with AD converter 34.From burner hearth entrance enter boiler coal-supplying amount, being supplied to the total blast volume of boiler and sending into the coal calorific value of boiler can be through after AD converter 34 converts data signal to, by CPU31, reads model in algorithm memory 32 to calculate the real-time furnace outlet oxygen amount of boiler.And can realize the adjusting to furnace outlet oxygen amount by PID adjuster, its adjustment process is techniques well known means, therefore in this, repeats no more.
According to the embodiment of the present invention, described system also comprises control device, for generating control signal according to the furnace outlet oxygen amount of described boiler to control the normal operation of boiler.And this system can also comprise display unit (as host computer), for showing in real time the furnace outlet oxygen amount of the boiler monitoring.In one embodiment, can be controlled boiler operatiopn and be shown the furnace outlet oxygen amount of boiler by monitor terminal, this monitor terminal can comprise the equipment such as operator station, historical station, tabulation/computer installation, engineer station, printer, journal printer, giant-screen.By this monitor terminal, can show in real time the furnace outlet oxygen amount of the boiler monitoring, and generate control signal according to furnace outlet oxygen amount, then control signal is back to the corresponding control device for boiler, to ensure the normal operation of CFBB.
As shown in Figure 4, coal-supplying amount checkout gear 11, Wind volume detector 12 and coal measurement of caloric value device 13 are interior can be respectively equipped with communication module 42, communication module 43 and communication module 44, and said apparatus can carry out 3G/GPRS communication by communication module and I/O module 41 separately.And said apparatus can be connected to PLC controller 30 by I/O module 41.The I/O communication controller 35 of PLC controller 30 carries out communication by I/O bus with I/O module 41 and is connected, from burner hearth entrance enter the coal-supplying amount of boiler, the coal calorific value that is supplied to the total blast volume of boiler and sends into boiler is sent to the I/O communication controller 35 PLC controller 30 by I/O module 41; Monitor terminal 40 is connected with PLC controller 30 by fieldbus (as, 1000M/100Mbps redundancy fault-tolerant highway).
Wherein I/O module 41 can comprise Switching Power Supply, apparatus for converting DC power, I/O plate and conditioning plate etc., and it is all encapsulated in aluminum hull, so as both effectively screening electron disturb, can protect again the invasion and attack of dust and external environment condition.In addition, I/O module 41 can also be connected with fielded system by base, and its address can be set by the DIP switch being arranged on base.
Monitoring system provided by the present invention can also comprise warning device, to when furnace outlet oxygen amount is not in preset range, report to the police.In one embodiment, described monitoring system can comprise communication device or long-range host computer, and PLC controller 30 can comprise SMS module, communication device or long-range host computer can be connected to this SMS module by wireless communication networks (GSM, CDMA or 3G), when furnace outlet oxygen amount is not in preset range, SMS module can carry out telephone call, SMS alarm or the warning of ipc monitor interface to communication device or long-range host computer, to process in time above-mentioned situation, guarantee safety in production.
In addition, in one embodiment, PLC controller 30 can also be connected with touch-screen, and operating personnel can, according to furnace outlet oxygen amount, carry out input control signal by touch-screen, to control the normal operation of boiler.
Recirculating fluidized bed (CFB) boiler is compared with pulverized-coal fired boiler, and maximum difference is the difference of combustion mechanism.The burning release heat of coal-powder boiler comes from the coal-supplying amount that moment enters burner hearth, once coal supply supply stops, burning just stops very soon; And the combustion heating amount of CFBB mainly comes from boiler a large amount of unburnt carbon (being the current carbon that is about to burning in burner hearth that is stored in a large number) that fires, rather than moment the coal-supplying amount that adds.The combustion heating amount that is stored in a large number carbon in burner hearth is the leading caloric value of current boiler, this essence mechanism of firing mechanism that carbonaceous amount dynamically accumulates and represented CFBC, through recirculating fluidized bed running all the time.Based on the above-mentioned theory of combustion, application software measuring technique of the present invention, introduces and fires carbon amount model, calculates furnace outlet oxygen amount monitor value.Problems that monitoring system provided by the present invention has abandoned that the fault rate that the checkout gear of existing Oxygen Amount in Flue Gas exists is high, certainty of measurement is low etc., it has, and reliability is high, computational accuracy is high, use and maintenance advantage easily, also optimized oxygen content control simultaneously, ensure Supercritical CFB Boiler security of operation, improved Supercritical CFB Boiler operational efficiency.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in the above-mentioned specific embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible combinations.
In addition, between various embodiment of the present invention, also can be combined, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (12)
1. a furnace outlet oxygen amount monitoring system for CFBB, is characterized in that, described system comprises:
Coal-supplying amount checkout gear, for detection of the coal-supplying amount that enters described boiler from burner hearth entrance;
Wind volume detector, for detection of the total blast volume that is supplied to described boiler;
Coal measurement of caloric value device, for measuring the coal calorific value of sending into described boiler; And
Data processing equipment, for according to described coal-supplying amount, described total blast volume and described coal calorific value, calculates the furnace outlet oxygen amount of described boiler.
2. system according to claim 1, is characterized in that, according to the furnace outlet oxygen amount of calculating described boiler with drag:
Instant heating coal amount model:
Furnace outlet oxygen signal model:
Wherein, Yo
2for furnace outlet oxygen amount; B (t) is the i.e. combustion carbon amount in t moment; PM (t) is the total blast volume in t moment; K is model overall coefficient; H is the unit caloric value of fuel, i.e. coal calorific value; F (t) is the coal-supplying amount that the t moment enters boiler from burner hearth entrance; Klo
2for oxygen amount model coefficient; L is air quantity correction signal; W is unit load.
3. system according to claim 1, is characterized in that, described coal-supplying amount checkout gear comprise for detection of input to described boiler coal weight LOAD CELLS and for detection of the velocity sensor of carrying coal to the speed of the belt of described boiler.
4. system according to claim 1, is characterized in that, described Wind volume detector comprises multiple air volume meters in the exit of the primary air fan, overfire air fan and the fluidized air blower that are placed in described CFBB.
5. according to the system described in any one claim in claim 1-4, it is characterized in that, described system also comprises control device, for generating control signal to control the normal operation of described boiler according to the furnace outlet oxygen amount of described boiler.
6. system according to claim 1, is characterized in that, described system also comprises warning device, for when described furnace outlet oxygen amount is not in preset range, reports to the police.
7. a furnace outlet oxygen amount method for supervising for CFBB, is characterized in that, described method comprises:
Detection enters the coal-supplying amount of described boiler from burner hearth entrance;
Detection is supplied to the total blast volume of described boiler;
The coal calorific value of described boiler is sent in measurement; And
According to the furnace outlet oxygen amount of boiler described in described coal-supplying amount, described total blast volume and described coal calorific value calculation.
8. method according to claim 7, is characterized in that, according to the furnace outlet oxygen amount of calculating described boiler with drag:
Instant heating coal amount model:
Furnace outlet oxygen signal model:
Wherein, Yo
2for furnace outlet oxygen amount; B (t) is the i.e. combustion carbon amount in t moment; PM (t) is the total blast volume in t moment; K is model overall coefficient; H is the unit caloric value of fuel, i.e. coal calorific value; F (t) is the coal-supplying amount that the t moment enters boiler from burner hearth entrance; Klo
2for oxygen amount model coefficient; L is air quantity correction signal; W is unit load.
9. method according to claim 7, is characterized in that, described detection coal-supplying amount comprises the coal weight and the extremely speed of the belt of described boiler of conveying coal that input to described boiler of detecting.
10. method according to claim 7, is characterized in that, described total blast volume comprises the air quantity in the exit of primary air fan, overfire air fan and the fluidized air blower of described CFBB.
11. according to the method described in any one claim in claim 7-10, it is characterized in that, described method also comprises according to the furnace outlet oxygen amount generation control signal of described boiler to control the normal operation of described boiler.
12. methods according to claim 7, is characterized in that, described method is also included in described furnace outlet oxygen amount not in preset range time, reports to the police.
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| CN105243178A (en) * | 2015-08-31 | 2016-01-13 | 华北电力大学 | System and method for quantifying coal supply heat release time of circulating fluidized bed boiler |
| CN106196162A (en) * | 2016-08-08 | 2016-12-07 | 南京电力设备质量性能检验中心 | A kind of W type flame boiler oxygen content at economizer outlet control method |
| CN107505927A (en) * | 2017-03-29 | 2017-12-22 | 华北电力大学 | CFB Boiler cigarette equipment fault monitoring method and device based on component |
| CN116189805A (en) * | 2023-04-19 | 2023-05-30 | 北京全应科技有限公司 | Coal quality change monitoring method based on oxygen prediction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107505927A (en) * | 2017-03-29 | 2017-12-22 | 华北电力大学 | CFB Boiler cigarette equipment fault monitoring method and device based on component |
| CN107505927B (en) * | 2017-03-29 | 2019-08-23 | 华北电力大学 | CFB Boiler cigarette equipment fault monitoring method component-based and device |
| CN116189805A (en) * | 2023-04-19 | 2023-05-30 | 北京全应科技有限公司 | Coal quality change monitoring method based on oxygen prediction |
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Application publication date: 20140416 |