CN201522502U - Acoustic measurement device of the velocity field in a combustion boiler furnace - Google Patents
Acoustic measurement device of the velocity field in a combustion boiler furnace Download PDFInfo
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- CN201522502U CN201522502U CN2009202301031U CN200920230103U CN201522502U CN 201522502 U CN201522502 U CN 201522502U CN 2009202301031 U CN2009202301031 U CN 2009202301031U CN 200920230103 U CN200920230103 U CN 200920230103U CN 201522502 U CN201522502 U CN 201522502U
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Abstract
The utility model provides an acoustic measurement device of the velocity field in a combustion boiler furnace. 8 groups of acoustic-wave emitters (2) and acoustic-wave receivers (3) are arranged on four walls of a same cross section of the furnace uniformly, so as to form 24 acoustic-wave propagation paths interlacing in a plane; a plurality of acoustic-wave emitters (2) are respectively connected with the output end of a power amplifier (1) through the I/O card (6) of a computer; the power supply ends of the acoustic-wave receivers (3) are respectively connected with the output end of a switching power supply (4); the signal output ends of the acoustic-wave receivers are respectively connected with the computer (5) through an A/D card (7); and the computer (5) is connected with a corresponding audio in port of the power amplifier (1) through a D/A card (8). The utility model has the advantages of good real-time performance and strong capability of presenting a continuum field; meanwhile, the technology has no requirement for media and environments of the fluid field to be measured, and has the characteristics of small volume, convenient installation, low system construction cost, and the like. Particularly, the utility model has more superiority in detecting the temperature field of a large-scale coal-burning boiler furnace of a power station.
Description
Technical field
The utility model relates to the especially monitoring equipment of quadrangle tangential circle boiler thermal-state operation of boiler, particularly a kind of acoustic method combustion boiler hearth velocity field measurement mechanism.
Background technology
Install per capita to the year two thousand twenty China and to estimate about 0.6 kilowatt, it is average to reach the present world, and national total installation of generating capacity reaches about 9.5 hundred million kilowatts, and generated energy will reach about 4.2 trillion kilowatt hours.China is to be the country of main primary energy with coal, and the leading position of coal electricity in generating is difficult to change in a short time.Press generated energy and calculate, the coal-fired electric weight of China only accounts for 80% at present.Coal in China output was 16.7 hundred million tons in 2003, generating and thermoelectric with 50% of coal total production, about 53.4 billion cubic meters of thermoelectricity water loss.To the year two thousand twenty, the coal burning machine pool-size also will reach about 600,000,000 kilowatts, double than now, and development is subjected to the very big restriction of coal resources, water resource and movement capacity.The existing fired power generating unit outfit of equipment technical merit of China falls behind, and performance has been compared big gap, gross coal consumption rate height with advanced international standard; Energy utilization rate is low, has further aggravated gaseous emission and environmental pollution that coal burning causes.
The develop rapidly of electrical production has objectively also proposed requirement to the advance of each measurement of correlation technology.Wherein, the measurement of boiler flue aerodynamic field is of fundamental sum necessity, also is the difficulty maximum.The smoke power field is the normally prerequisite of operation of boiler with stablizing rationally in the burner hearth of power station and Industrial Boiler and the horizontal flue, so it is convenient, measurement reliably is very important, will provide direct foundation for the safety and the optimization operation of boiler.
The burner hearth aerodynamic field mainly refers to burning and does not reach burner hearth interior air (comprising the fuel that air carries) and the flow direction of products of combustion and the distribution of velocity amplitude.The quality of boiler operation reliability and economy and burner hearth aerodynamic field has confidential relation.Stop good burner hearth aerodynamic field can guarantee that boiler combustion stablizes, burns rapidly, suitable burner hearth combustion centre and good furnace flame degree of filling are arranged, and the burner hearth air-flow do not have deflection also not welt wash away the furnace wall.Thereby so just can keep economical and burning reliably can efficiently and safely move boiler.Putting into operation and moved boiler at new boiler combustion failure occurs and need find out actual condition in the stove often, so that pinpoint the problems the adjustment of in time burning.For this reason, just need carry out the test of burner hearth aerodynamic field.
The test of burner hearth aerodynamic field generally has two classes, and a class is called the hot aerodynamic field test of burner hearth, and the another kind of burner hearth cold air dynamic field that is called is tested.The former is when boiler operatiopn, that is burner hearth is when being red-hot, the burner hearth aerodynamic field test of carrying out, and its difficulty is bigger, thereby general less mensuration; The latter is when burner hearth is stopped using, that is burner hearth is when being cold conditions, the burner hearth aerodynamic field test of carrying out, at this moment, can adopt the method that burner hearth ventilates as usual to measure, than the former, its mensuration process is greatly simplified, thereby is a kind of mensuration means of differentiation burner hearth aerodynamic force operating mode quality commonly used.
Burner hearth internally-powered field and temperature field interact and are coupled, and the monitoring of burner hearth combustion air aerodynamic field has crucial meaning for adjustment of burner hearth burning optimization and control.Boiler furnace air power regime not only directly affects the combustion conditions and the efficient of boiler, also affect the security of burner hearth and heating surface, for solving problems such as boiler coke, residual rotation, and for the transformation or the heat state combustion adjustment of boiler provides reliable scientific basis, the boiler test personnel will often carry out the cold air dynamic field test at the scene.The cold air dynamic field test is carried out with the method that ribbon combines with the anemoscope measurement usually in the stove: observe comprehensive airflow state in a certain cross section with the ribbon net, the usefulness anemoscope is measured the velocity magnitude of Chosen Point in the stove in stove.This method work is heavy, and difficulty is big, is difficult to provide the furnace air kinematic behavior under the interference-free situation.Also there is research to attempt measuring technique in addition and mainly contains the hot-wire anemometer method, utilize hot-wire anemometer and trace method to measure the aerodynamic field in a certain W type stove under the different operating modes; Also paid laser Doppler method on probation is studied burner turbulent flow flow field, but bigger limitation is all arranged.In addition, with self-programmed software than period morning, or commercial CFD software afterwards carries out analog computation to aerodynamic field in the boiler even combustion process etc., it also is a kind of research means very useful and commonly used, usually be used for boiler design and operation are carried out predictions and simulations, to reach complementary optimization and to solve the purpose of the problem that occurs in the boiler operatiopn.
The utility model content
The purpose of this utility model provides a kind of acoustic method combustion boiler hearth velocity field measurement mechanism in order to online fast monitored quadrangle tangential circle boiler stove flow field.
The purpose of this utility model is achieved by the following technical solution:
Described acoustic method combustion boiler hearth velocity field measurement mechanism, it is characterized in that: the wall at the same section of burner hearth evenly is provided with 8 groups of pingers and acoustic receiver, constitute 24 acoustic wave propagation paths that interweave in the plane, a plurality of pingers are connected with the output terminal of power amplifier by the I/O card of computing machine respectively, the power end of described a plurality of acoustic receivers is connected with the output terminal of Switching Power Supply respectively, its signal output part is connected with computing machine by the A/D card respectively, and computing machine is connected with the respective audio input port of power amplifier by the D/A card.The sample frequency of described I/O card, A/D card and D/A card is all greater than 240KHZ.The input end of Switching Power Supply is connected with 220V.The voltage of the power supply of power amplifier is greater than 24V.
Compared with prior art, the utlity model has following advantage:
1, be contactless.Can not cause interference to survey field;
2, rapid and convenient.Carry out once complete section circle of contact flow field sonic method measurement and only need about 8 seconds;
3, cost is low.Must be in stove when having saved the traditional power field measurement scaffolding, and enter extensive work and the time that burner hearth carries out point-to-point measurement by the staff, and during the fan operation expense.
4, be measurement of full field.Sonic method is measured the velocity flow profile that can reflect full section circle of contact field preferably, and classic method can only be surveyed the speed of the finite point on the central cross frame in the section;
5, be expected to be used for hot operation stove internally-powered field in real time, on-line measurement, understanding the Furnace Aerodynamic Field operation conditions at any time, and carry out control corresponding and regulate;
6, can utilize the interior acoustic signals analysis of the stove that sonic transducer received of system whether to have four pipe explosions unusual.
The utility model is because the outstanding feature of this flow field monitoring technology is a real-time, and is untouchable, reaches the reproduction to continuous, and this technology does not require institute's flow measurement field medium and environment simultaneously, so this technology can widespread use on the quadrangle tangential circle boiler.It is little to the utlity model has volume, is convenient to characteristics such as installation and system cost are low.
Description of drawings
Fig. 1 is test philosophy figure,
Fig. 2 is a structural representation of the present utility model,
Fig. 3 is the software systems process flow diagrams,
Among the figure: 1-power amplifier, 2-pinger, 3-acoustic receiver, 4-Switching Power Supply, 5-computing machine, 6-I/O card, 7-A/D card, 8-D/A card, 9-power supply.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.Fig. 1, in 2, described acoustic method combustion boiler hearth velocity field measurement mechanism, it is characterized in that: the wall at the same section of burner hearth evenly is provided with 8 groups of pingers 2 and acoustic receiver 3, constitute 24 acoustic wave propagation paths that interweave in the plane, a plurality of pingers 2 are connected with the output terminal of power amplifier 1 by the I/O card 6 of computing machine respectively, the power end of described a plurality of acoustic receiver 3 is connected with the output terminal of Switching Power Supply 4 respectively, its signal output part is connected with computing machine 5 by A/D card 7 respectively, and computing machine 5 is connected with the respective audio input port of power amplifier 1 by D/A card 8.The sample frequency of described I/O card 6, A/D card 7 and D/A card 8 is all greater than 240KHZ.The input end of Switching Power Supply 4 is connected with 220V.The voltage of the power supply 9 of power amplifier is greater than 24V.
Among Fig. 3, described method of testing based on acoustic method combustion boiler hearth velocity field measurement mechanism is: concrete steps are: the first step is provided with sampling parameter; In second step, each pinger sends very brief acoustic signals successively, and receives acoustic signals and accurately identification by each acoustic receiver, and sampling module obtains containing the signal data of noise; In the 3rd step, the signal filtering denoising obtains useful signal preferably; In the 4th step, the signal correction analysis module calculates the travel-time of opposite two directions of each road signal, obtains the travel-time of sound wave in this direction by each projected path beginning, terminal signal by correlation method; In the 5th step, rebuild the flow field of the section of surveying, i.e. section two-dimension speed distribution by the travel-time on each projected path.
Described reconstruction algorithm is to adopt complicated, the method for vector chromatography efficiently, obtains the approximate Velocity Profiles of full section field, obtains the position size of its circle of contact, can understand the resonable degree of formed aerodynamic field.
Following several work have been carried out before the embodiment: select the suitable data capture card.Because the laboratory model size of burner hearth is less, acoustic transit time is short, need higher sonic data sample frequency, begin to adopt the A/D card of circulating sampling, every channel sample frequency can only reach 100kHz at most, and through the accuracy requirement that experiment does not reach required about 10-6, synchronous collecting card is adopted in the back, every channel sample frequency reaches 240kHz, and the sonic method reconstructed results is made moderate progress.
Design is fit to acoustic pickup and the piezoelectric speaker that model experiment requires.Require enlargement factor moderate to acoustic pickup, power of loudspeaker is suitably big, makes received acoustic signals that bigger signal to noise ratio (S/N ratio) be arranged, and helps effective identification of signal.
Velocity field reconstruction algorithm and program have been carried out a large amount of intensive debugging and optimization, made reconstructed results more become rationally reliable.
Studied different reconstruction algorithm, the one, Helmholtz resolution of vectors theorem, rebuild for general on physical law such as the mass conservation and Newmann boundary condition and the condition basis, the one, the quadrangle tangential circle field is reduced to the rotation field model of determining by six parameters, facts have proved, two models respectively have superiority, the reconstruction that the latter is easier to be similar to.
At actual furnace size in the field experiment, redesigned the key parameter of acoustic pickup, make its signal amplification factor suitable mutually.Test according in advance calculating and range finding simultaneously, the power amplifier of changing loudspeaker is replaced by the 24V power supply by original 12V power supply, its effective propagation distance is estimated to satisfy the field experiment requirement.In addition, the requirement of the sample frequency of A/D card decreases for actual furnace, because it is of a size of about 14 times of laboratory model, be all under the cold conditions situation like this, travel-time has suitable ratio, thus same sampling card, also have an appointment 14 times the increase of its relative accuracy.
In a word, it is feasible that sonic method is used to measure Furnace Aerodynamic Field, and on the basis that hardware system and reconstruction algorithm are optimized, can measure the distribution of section air-flow field in coming out of the stove preferably.And obtain under the further perfect situation in system, it is even more ideal that sonic method will be measured.Existing laboratory experiment and on-the-spot Preliminary Applications show that the measurement of section velocity field has significant industrial application value and prospect in the sonic method stove.
Claims (4)
1. acoustic method combustion boiler hearth velocity field measurement mechanism, it is characterized in that: the wall at the same section of burner hearth evenly is provided with 8 groups of pingers (2) and acoustic receiver (3), constitute 24 acoustic wave propagation paths that interweave in the plane, a plurality of pingers (2) are connected with the output terminal of power amplifier (1) by the I/O card (6) of computing machine respectively, the power end of a plurality of acoustic receivers (3) is connected with the output terminal of Switching Power Supply (4) respectively, its signal output part is connected with computing machine (5) by A/D card (7) respectively, and computing machine (5) is connected by the respective audio input port of D/A card (8) with power amplifier (1).
2. according to the described acoustic method combustion boiler hearth of claim 1 velocity field measurement mechanism, it is characterized in that: the sample frequency of described I/O card (6), A/D card (7) and D/A card (8) is all greater than 240KHZ.
3. according to the described acoustic method combustion boiler hearth of claim 1 velocity field measurement mechanism, it is characterized in that: the input end of Switching Power Supply (4) is connected with 220V.
4. according to the described acoustic method combustion boiler hearth of claim 1 velocity field measurement mechanism, it is characterized in that: the voltage of the power supply of power amplifier (9) is greater than 24V.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202301031U CN201522502U (en) | 2009-11-20 | 2009-11-20 | Acoustic measurement device of the velocity field in a combustion boiler furnace |
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| CN2009202301031U CN201522502U (en) | 2009-11-20 | 2009-11-20 | Acoustic measurement device of the velocity field in a combustion boiler furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108955935A (en) * | 2018-07-19 | 2018-12-07 | 东南大学 | The testing equipment and test method of measurement flue temperature field and flow field based on acoustic measuring technique |
| US10612949B2 (en) | 2015-02-11 | 2020-04-07 | General Electric Technology Gmbh | Plant, measurement system, and method for measuring temperature and velocity of a flow of fluid |
-
2009
- 2009-11-20 CN CN2009202301031U patent/CN201522502U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10612949B2 (en) | 2015-02-11 | 2020-04-07 | General Electric Technology Gmbh | Plant, measurement system, and method for measuring temperature and velocity of a flow of fluid |
| CN108955935A (en) * | 2018-07-19 | 2018-12-07 | 东南大学 | The testing equipment and test method of measurement flue temperature field and flow field based on acoustic measuring technique |
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Owner name: STATE ELECTRIC NET CROP. Effective date: 20121018 Owner name: THE ELECTRIC POWER SCIENCE RESEARCH INSTITUTE OF H Free format text: FORMER OWNER: HUBEI PROV. POWER TEST INST. Effective date: 20121018 |
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Effective date of registration: 20121018 Address after: 430077, 361 East Main Street, Wuchang District, Hubei, Wuhan Patentee after: Hubei Electric Power Research Institute of Power Company Patentee after: State Grid Corporation of China Address before: 430077 Hubei city of Wuhan province Wuchang Xudong Avenue No. 361 Patentee before: Hubei Prov. Power Test Inst. |
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Granted publication date: 20100707 Termination date: 20181120 |