CN107843286A - A kind of boiler draft test data on-line acquisition system and analysis and processing method - Google Patents
A kind of boiler draft test data on-line acquisition system and analysis and processing method Download PDFInfo
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Abstract
A kind of boiler draft test data on-line acquisition system and analysis and processing method, gather differential pressure in multiple test pipes of boiler, pressure and temperature in real time by collection in worksite element, and send the signal to data processing centre；Data processing centre is calculated, and obtains the air quantity correction factor of air quantity, wind speed, wind speed deviation and the total pipeline being connected with four test pipes；Field test adjustment actuator receives the air quantity that data processing centre issues after TD in Adjustment Tests pipeline, and until 0~100% operating mode, all measurement terminates, obtain the tube performance curve under corresponding operating mode, corresponding Controlling model is established according to tube performance curve, realizes and boiler combustion is accurately controlled.The present invention has the advantages of gathered data amount is big, collection period is short, gathered data precision is high, realizes artificial irreplaceable discriminating data and data-handling capacity, improves the information content of test data, realize system intelligent automatic control.
Description
Technical field
The present invention relates to excellent, the Intelligent data analysis field that intelligently becomes, more particularly to a kind of boiler draft test data are online
Acquisition system and analysis and processing method.
Background technology
At present, the data acquisition of station boiler ventilation experiment is and manually gathered, collection period length, collection operating mode it is few,
Data volume is limited and error is big, can not meet that boiler cold-state test data and boiler operatiopn realize that intelligent optimization, analysis are examined
The disconnected, requirement of intelligent control.Boiler draft test data online acquisition analysis and processing method is that one kind combines in data acquisition, divided
Analyse, calculate in the new technology of one, can realize that cold test data from 0%~100% operating mode continuous acquisition, gather operating mode
It is particularly heavy that rich become to realization intelligence excellent, intelligent diagnostics, the intelligent control of continuity and gathered data amount provide technical basis
Will.
The quality of boiler draft experiment quality directly affects the important tests of boiler efficiency, and tests height and the examination of quality
The continuity of process gathered data, the precision of gathered data are tested, the data volume of gathered data has direct relation.Existing experiment
Means and test method, made by the discontinuous of the operating mode gathered, the factor such as gathered data precision is low, gathered data amount is limited
About, the simulation model of higher similarity can not be obtained, can not be realized intelligently become excellent, intelligent diagnostics, intelligent control, be unfavorable for group
Knit in stove and burn, reduce boiler efficiency.
Therefore, it is necessary to be collected during boiler draft experiment more, more accurate under the overall background that wisdom generates electricity
Test data, there is provided the excellent, intelligent diagnostics that intelligently become establish intelligent control model, optimize and revise operating condition, improve boiler efficiency
More intelligent control system.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of boiler draft test data online acquisition analysis process system,
Real-time online collection analysis is carried out to boiler draft test data, result is calculated and be shown.
In order to solve the above problems, the technical solution adopted by the present invention is as follows：
A kind of boiler draft test data on-line acquisition system, including data processing centre, data acquisition center, scene examination
Test adjustment actuator and multigroup collection in worksite element；
The collection in worksite element, for measuring the differential pressure in multiple pipelines, pressure and temperature in real time, after signal converts
It is transferred to data acquisition center；
The data acquisition center, in real time sending the signal received through data wire or radio data-transmission equipment
To data processing centre；
The data processing centre, for the data for receiving data acquisition equipment to be analyzed, calculate, store and shown
Show result, and experiment process instruction is assigned to field test adjustment actuator；
The field test adjusts actuator, and the experiment of system, to the instruction of data processing centre, is adjusted for receiving
Operating mode.
Further improve of the invention is that the collection in worksite element includes differential pressure pressure measuring cell, pressure difference pick-up
Device, pressure pressure measuring cell, pressure transmitter and temperature transmitter；
Differential pressure pressure measuring cell, for measuring the air-flow differential pressure signal in pipeline in real time, and by gas after pressure transmission conduit
Stream differential pressure signal is sent to pressure difference transmitter；
Pressure difference transmitter, the air-flow differential pressure signal for receiving changes into 4~20mA current signals, and is real-time transmitted to
Data acquisition center；
Pressure pressure measuring cell, for measuring the stream pressure signal in multiple pipelines in real time, and stream pressure is believed
Number send pressure transmitter to；
Pressure transmitter, for the stream pressure received signal to be changed into 4~20mA current signals, and transmit in real time
To data acquisition center；
Temperature transmitter, for the gas flow temperature in the multiple pipelines measured in real time to be real-time transmitted in data acquisition
The heart.
Further improve of the invention is that the acquisition system also includes field data central monitoring position, for monitoring in real time
The experimental result of adjustment can move in experimental field.
The analysis and processing method of one germline boiler draft test data on-line acquisition system, comprises the following steps：
1) differential pressure in multiple test pipes of boiler, pressure and temperature are gathered in real time by collection in worksite element, and will
Signal is sent to data acquisition center；
2) signal received is sent to by data acquisition center by USB data line or radio data-transmission equipment in real time
Data processing centre；
3) data processing centre will receive data and be calculated, and obtain air quantity, wind speed, wind speed deviation and be tried with four
Test the air quantity adjusted coefficient K of the connected total pipeline of pipeline；If wind speed deviation then adjusts one or more not within ± 5%
Wind speed in developmental tube so that wind speed deviation is within ± 5%；By air quantity, wind speed, wind speed deviation and with four test pipes
The air quantity adjusted coefficient K of connected total pipeline is shown on computers in real time, while stores data, and issues TD to existing
Field experiment adjustment actuator；
4) field test adjustment actuator will receive data processing centre's TD, the air quantity in Adjustment Tests pipeline
Until 0~100% operating mode, all measurement terminates, and obtains the tube performance curve under corresponding operating mode, is built according to tube performance curve
Corresponding Controlling model is found, realizes and boiler combustion is accurately controlled.
Further improve of the invention is that the detailed process in step 3) is as follows：Data processing centre will receive by
The current signal received is converted to differential pressure, pressure, temperature signal, and to the difference after being changed in multiple pipelines within the time difference
Pressure, pressure peak signal are compared, and undesirable signal is filtered, then to filtered differential pressure, pressure, temperature
Signal of change, obtain the air quantity adjusted coefficient K of air quantity, wind speed, wind speed deviation and the total pipeline being connected with four test pipes.
Further improve of the invention is that wind speed deviation calculating process is as follows：
In formula：
VnFor the wind speed of certain root test pipe of boiler draft experiment, the quantity of n expression test pipes, and n=1,2,
3,4；
K0For the calibration coefficient of testing standard part；
PdFor the differential pressure in certain root test pipe of boiler draft experiment；
ρ is certain root test pipe interior air-flow density of boiler draft experiment；
ρ is calculated by below equation (2)：
In formula：
paFor local atmospheric pressure；
psFor the static pressure in certain root test pipe section of boiler draft experiment；
T is the gas flow temperature in certain root test pipe of boiler draft experiment；
ρ0For the atmospheric density under standard state；
Four test pipe wind speed deviations in boiler draft experiment are represented using nondimensional number ε, by following formula (3)
Calculate：
In formula, the wind speed of certain root test pipe, w during w tests for boiler draftpFour developmental tubes in being tested for boiler draft
The mean wind speed in road；
wp=(V1+V2+V3+V4)/4 (4)
Wherein, V1For the wind speed of first experiment root pipeline, V2For the wind speed of second experiment root pipeline, V3For the 3rd
Test the wind speed of root pipeline, V4For the wind speed of the 4th experiment root pipeline.
Further improve of the invention is that the air quantity adjusted coefficient K for the total pipeline being connected with four test pipes passes through
Procedure below obtains：
The air quantity adjusted coefficient K for the total pipeline being connected with four test pipes is calculated by formula (8)
K=Q∑n/Qsb (8)
Wherein, Q∑nFor boiler draft test in certain four test pipe air quantity and；
Q∑n=Σ Qn (6)
Qn=3600 × An×Vn (5)
QnThe air quantity of certain root test pipe in being tested for boiler draft；
AnThe sectional area of certain root test pipe in being tested for boiler draft；
VnThe wind speed of test pipe is tested for certain root of boiler draft experiment；
The quantity of n expression test pipes, and n=1,2,3,4；
Wherein, QsbFor the air quantity for the air quantity of total pipeline being connected with four test pipe porch；
A is the sectional area for the total pipeline being connected with four test pipe porch；
KsbFor the coefficient that dispatches from the factory of differential pressure device on the total pipeline that is connected with four test pipe porch；
PdFor the differential pressure in certain root test pipe of boiler draft experiment；
ρ0For the atmospheric density under standard state；
paFor local atmospheric pressure；
psFor the static pressure in certain root test pipe section of boiler draft experiment；
T is the gas flow temperature in certain root test pipe of boiler draft experiment.
Compared with prior art, the invention has the advantages that：
The present invention is measured differential pressure in multiple pipelines, pressure and temperature, converted through signal by collection in worksite element in real time
After be transferred to data acquisition center, data acquisition center in real time sends the signal received to Data processing through data wire
Result is analyzed, is calculated, stored and shown to the data for receiving data acquisition equipment by the heart, data processing centre, and will be real
Test process instruction and be assigned to field test adjustment actuator, field test adjustment actuator, for receiving to Data processing
The instruction of the heart, the operating condition of test of system is adjusted, the system is simple in construction, can complete the collection of data.
The present invention is by calculating air quantity, wind speed and wind speed are deteriorated, and when wind speed deviation is not within ± 5%, then adjusts one
Wind speed in root or more developmental tubes so that within ± 5%, realizing ventilation experiment data can be existed wind speed deviation with computer
Line real-time collection and continual collection, analysis, calculating, and result of the test is intuitively fed back into testing crew in real time, overcome existing experiment
Method can only be limited by the manual gathered data of testing crew, manual calculations, collection operating point, and gathered data amount is limited, collection
Cycle is grown, and gathered data precision can not ensure, result of calculation can not realize the difficulties such as real-time visual.Using present system and
Method, operating condition of test can realize 0-100% operating mode continuous acquisitions, and draw the tube performance curve under corresponding operating mode, according to pipe
Road performance curve establishes corresponding Controlling model, realizes the accurate control to boiler combustion, makes boiler economic operation.Present invention tool
There is the advantages of gathered data amount is big, collection period is short, gathered data precision is high, and can be kicked in gatherer process except data peak
Value, artificial irreplaceable discriminating data and data-handling capacity are realized, the information content of test data is improved, to realize system intelligence
Framework can be automatically controlled and obtain critical data.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram of boiler draft test data online acquisition analysis process system of the present invention；
Fig. 2 is a kind of flow chart of the processing method of boiler draft test data online acquisition analysis of the present invention.
In figure, 1 is collection in worksite element, and 2 be that signal transmits shielded cable, and 3 be data acquisition center, and 4 be USB transmission number
According to line, 5 be radio data-transmission equipment, and 6 be data processing centre, and 7 be that field test adjusts actuator.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
The present invention provides a kind of boiler draft test data online acquisition analysis process system, as shown in figure 1, including data
Processing center, data acquisition center, field test adjustment actuator 7 and multigroup collection in worksite element；
The collection in worksite element 1, for measuring the differential pressure in multiple pipelines, pressure and temperature in real time, converted through signal
After be transferred to data acquisition center；
The collection in worksite element 1 includes differential pressure pressure measuring cell, pressure difference transmitter, pressure pressure measuring cell, pressure
Power transmitter and temperature transmitter；
Differential pressure pressure measuring cell, for measuring the air-flow differential pressure signal in pipeline in real time, and by gas after pressure transmission conduit
Stream differential pressure signal is sent to pressure difference transmitter；
Pressure difference transmitter, the air-flow differential pressure signal for receiving changes into 4~20mA current signals, and is real-time transmitted to
Data acquisition center；
Pressure pressure measuring cell, for measuring the stream pressure signal in multiple pipelines in real time, and stream pressure is believed
Number send pressure transmitter to；
Pressure transmitter, for the stream pressure received signal to be changed into 4~20mA current signals, and transmit in real time
To data acquisition center；
Temperature transmitter, for the gas flow temperature in the multiple pipelines measured in real time to be real-time transmitted in data acquisition
The heart.
The data acquisition center, in real time by the signal received through data wire (or radio data-transmission equipment 5)
Send to data processing centre；Data acquisition center includes field data central monitoring position, for monitoring the experiment knot of adjustment in real time
Fruit can move in experimental field.I.e. data acquisition center includes two computers, wherein a computer is as field data
Central monitoring position, and can move, the result that scene is checked after adjustment on the spot according to adjustment result can be arrived.
The data processing centre, for the data for receiving data acquisition equipment to be analyzed, calculate, store and shown
Show result, and experiment process instruction is assigned to field test adjustment actuator；
The field test adjusts actuator 7, and the experiment of system, to the instruction of data processing centre, is adjusted for receiving
Operating mode.
As shown in Fig. 2 a kind of analysis and processing method of above-mentioned system's boiler draft test data on-line acquisition system, including with
Lower step：
1) differential pressure in multiple test pipes of boiler, pressure and temperature are gathered in real time by collection in worksite element, and will
Signal is sent to data acquisition center；
2) data acquisition center is in real time transmitted the signal received by USB data line or radio data-transmission equipment 5
To data processing centre；
3) data processing centre will receive the current signal that will receive and be converted to differential pressure, pressure, temperature signal, and
The differential pressure that collects in multiple pipelines, pressure peak signal are entered to compare in certain time poor (1 second), to undesirable
Signal is filtered, then filtered differential pressure, pressure, temperature signal are calculated, and obtains air quantity, wind speed, wind speed deviation.Wherein,
Undesirable signal is the signal for the threshold range for not meeting setting time or the signal in same time point step evolution
Only exist on certain root test pipe, if specifically, the peak signal collected after 11 seconds more than 10 seconds in it is signal collected
Average value or the only signal of one changes and changes amplitude and exceedes origin pipeline in the pipeline of experiment simultaneously in 1 second
The average value of first 3 seconds is then undesirable signal.It is as follows to calculate detailed process：
Wind speed deviation calculating process is as follows：
In formula：
VnFor the wind speed of certain root test pipe of boiler draft experiment, the quantity of n expression test pipes, and n=1,2,
3,4；
K0For the calibration coefficient of testing standard part；
PdFor the differential pressure in certain root test pipe of boiler draft experiment；
ρ is certain root test pipe interior air-flow density of boiler draft experiment；
ρ is calculated by below equation (2)：
In formula：
paFor local atmospheric pressure；
psFor the static pressure in certain root test pipe section of boiler draft experiment；
T is the gas flow temperature in certain root test pipe of boiler draft experiment；
ρ0For the atmospheric density under standard state；
Four test pipe wind speed deviations in boiler draft experiment are represented using nondimensional number ε, by following formula (3)
Calculate：
In formula, the wind speed of certain root test pipe, w during w tests for boiler draftpFour developmental tubes in being tested for boiler draft
The mean wind speed in road；
wp=(V1+V2+V3+V4)/4 (4)
Wherein, V1For the wind speed of first experiment root pipeline, V2For the wind speed of second experiment root pipeline, V3For the 3rd
Test the wind speed of root pipeline, V4For the wind speed of the 4th experiment root pipeline.
If wind speed deviation not within ± 5%, then adjusts the wind speed in one or more developmental tube so that wind speed deviation
Within ± 5%；
At present, the straight length of the wind measuring equipment installation site for the total pipeline being connected with four test pipes can not meet
Swim 8~10D of straight tube segment length (D is tested pipeline internal equivalent diameter), downstream 1~2D of straight tube segment length requirement, measured air quantity and reality
Border larger deviation be present, it is necessary to which the air quantity that the total pipeline being connected with four test pipes is accurately measured by ventilation experiment is repaiied
Positive coefficient K, calculating process are as follows：
The air quantity adjusted coefficient K for the total pipeline being connected with four test pipes is calculated by formula (8)
K=Q∑n/Qsb (8)
Wherein, Q∑nFor boiler draft test in certain four test pipe air quantity and；
Q∑n=Σ Qn (6)
Qn=3600 × An×Vn (5)
QnThe air quantity of certain root test pipe in being tested for boiler draft；
AnThe sectional area of certain root test pipe in being tested for boiler draft；
VnThe wind speed of test pipe is tested for certain root of boiler draft experiment；
The quantity of n expression test pipes, and n=1,2,3,4；
Q∑n=Σ Qn=Q1+Q2+Q3+Q4
Wherein, Q1For the air quantity of first experiment root pipeline, Q2For the air quantity of second experiment root pipeline, Q3For the 3rd
Test the air quantity of root pipeline, Q4For the air quantity of the 4th experiment root pipeline；
Wherein, QsbFor the air quantity for the air quantity of total pipeline being connected with four test pipe porch；
A is the sectional area for the total pipeline being connected with four test pipe porch；
KsbFor the coefficient that dispatches from the factory of differential pressure device on the total pipeline that is connected with four test pipe porch；KsbNumerical value exist
It can be inquired about per covering device specification；
PdFor the differential pressure in certain root test pipe of boiler draft experiment；
ρ0For the atmospheric density under standard state；
paFor local atmospheric pressure；
psFor the static pressure in certain root test pipe section of boiler draft experiment；
T is the gas flow temperature in certain root test pipe of boiler draft experiment.
Data processing centre is by the air quantity of air quantity, wind speed, wind speed deviation and the total pipeline being connected with four test pipes
Adjusted coefficient K is shown on computers in real time, while stores data, and is issued TD and adjusted actuator 7 to field test；
4) field test adjustment actuator will receive data processing centre's TD, and the air quantity adjusted in test tube road is straight
To 0-100% operating modes, all measurement terminates, and obtains the tube performance curve under corresponding operating mode, and the specific of tube performance curve can be with
For the curve of air quantity-time, the curve of wind speed-time, the curve, the curve of air quantity-correction factor etc. of wind speed deviation-time.
Corresponding Controlling model is established according to tube performance curve, realizes and boiler combustion is more accurately controlled, transports boiler economy
OK.
Data acquisition center 4 is connected with radio data-transmission equipment 5.In order to facilitate the collection and transmission of test data, sheet
Data acquisition center can use a variety of transmission means in invention, can be transmitted by USB high speed data lines, can also pass through nothing
Line device broadcasts form send it is defeated, diversified forms receive transmission data, be adapted to more complicated experimental enviroment.
In the present invention, collection of the data acquisition center to the multigroup element signal in scene, shielded cable 2 is transmitted using signal
Data acquisition center 3 is transmitted data to, ensures not influenceed by extraneous signal in transmitting procedure, ensures that gathered data truly may be used
Lean on, safety.Data acquisition center 3 transmits a signal to data processing centre 6 by USB transmission data wire 4.
The present invention is by differential pressure pressure obtaning device, pressure pressure obtaning device and temperature measuring equipment by differential pressure transmitter, pressure inverting
Device and temperature transmitter change into the signal that collecting device can identify, by data processing centre to the classification of gathered data at
Reason and calculating, complete boiler draft test data real-time online and continuously analyze and process and calculate, and show result, and automatically by examination
The process of testing sends to field test and adjusts actuator, performs next operating condition of test.
Claims (7)
1. a kind of boiler draft test data on-line acquisition system, it is characterised in that including in data processing centre, data acquisition
The heart, field test adjustment actuator and multigroup collection in worksite element；
The collection in worksite element, for measuring the differential pressure in multiple pipelines, pressure and temperature in real time, transmitted after signal converts
To data acquisition center；
The data acquisition center, in real time sending the signal received to number through data wire or radio data-transmission equipment
According to processing center；
The data processing centre, for being analyzed, calculating, storing and being shown knot by the data for receiving data acquisition equipment
Fruit, and experiment process instruction is assigned to field test adjustment actuator；
The field test adjusts actuator, and the operating condition of test of system, to the instruction of data processing centre, is adjusted for receiving.
A kind of 2. boiler draft test data on-line acquisition system according to claim 1, it is characterised in that the scene
Acquisition elements include differential pressure pressure measuring cell, pressure difference transmitter, pressure pressure measuring cell, pressure transmitter and temperature pick-up
Device；
Differential pressure pressure measuring cell, for measuring the air-flow differential pressure signal in pipeline in real time, and it is after pressure transmission conduit that air-flow is poor
Pressure signal is sent to pressure difference transmitter；
Pressure difference transmitter, the air-flow differential pressure signal for receiving changes into 4~20mA current signals, and is real-time transmitted to data
Collection center；
Pressure pressure measuring cell, passed for measuring the stream pressure signal in multiple pipelines in real time, and by stream pressure signal
Give pressure transmitter；
Pressure transmitter, for the stream pressure received signal to be changed into 4~20mA current signals, and it is real-time transmitted to number
According to collection center；
Temperature transmitter, for the gas flow temperature in the multiple pipelines measured in real time to be real-time transmitted into data acquisition center.
A kind of 3. boiler draft test data on-line acquisition system according to claim 1, it is characterised in that the collection system
System also includes field data central monitoring position, for monitoring that the experimental result of adjustment can move in experimental field in real time.
4. it is a kind of based on described in claim 1 be boiler draft test data on-line acquisition system analysis and processing method, its
It is characterised by, comprises the following steps：
1) differential pressure in multiple test pipes of boiler, pressure and temperature are gathered in real time by collection in worksite element, and by signal
Send to data acquisition center；
2) signal received is sent to data by data acquisition center by USB data line or radio data-transmission equipment in real time
Processing center；
3) data processing centre will receive data and be calculated, obtain air quantity, wind speed, wind speed deviation and with four developmental tubes
The air quantity adjusted coefficient K of the connected total pipeline in road；If wind speed deviation not within ± 5%, then adjusts one or more experiment
Wind speed in pipe so that wind speed deviation is within ± 5%；It is connected air quantity, wind speed, wind speed deviation and with four test pipes
The air quantity adjusted coefficient K of total pipeline show on computers in real time, while store data, and issue TD and tried to scene
Test adjustment actuator；
4) field test adjustment actuator will receive data processing centre's TD, the air quantity in Adjustment Tests pipeline until
All measurement terminates 0~100% operating mode, obtains the tube performance curve under corresponding operating mode, phase is established according to tube performance curve
The Controlling model answered, realizes and boiler combustion is accurately controlled.
5. a kind of analysis and processing method of system's boiler draft test data on-line acquisition system according to claim 4, its
It is characterised by, the detailed process in step 3) is as follows：Data processing centre will receive the current signal that will receive and be converted to
Differential pressure, pressure, temperature signal, and the differential pressure after being changed in multiple pipelines, pressure peak signal are compared within the time difference,
Undesirable signal is filtered, then to filtered differential pressure, pressure, temperature signal calculate, obtain air quantity, wind speed,
The air quantity adjusted coefficient K of wind speed deviation and the total pipeline being connected with four test pipes.
6. a kind of analysis and processing method of system's boiler draft test data on-line acquisition system according to claim 4, its
It is characterised by, wind speed deviation calculating process is as follows：
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In formula：
VnFor the wind speed of certain root test pipe of boiler draft experiment, the quantity of n expression test pipes, and n=1,2,3,4；
K0For the calibration coefficient of testing standard part；
PdFor the differential pressure in certain root test pipe of boiler draft experiment；
ρ is certain root test pipe interior air-flow density of boiler draft experiment；
ρ is calculated by below equation (2)：
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In formula：
paFor local atmospheric pressure；
psFor the static pressure in certain root test pipe section of boiler draft experiment；
T is the gas flow temperature in certain root test pipe of boiler draft experiment；
ρ0For the atmospheric density under standard state；
Four test pipe wind speed deviations in boiler draft experiment are represented using nondimensional number ε, based on following formula (3)
Calculate：
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In formula, the wind speed of certain root test pipe, w during w tests for boiler draftpFour test pipes in being tested for boiler draft
Mean wind speed；
wp=(V1+V2+V3+V4)/4 (4)
Wherein, V1For the wind speed of first experiment root pipeline, V2For the wind speed of second experiment root pipeline, V3For the 3rd experiment
The wind speed of root pipeline, V4For the wind speed of the 4th experiment root pipeline.
7. a kind of analysis and processing method of system's boiler draft test data on-line acquisition system according to claim 6, its
It is characterised by, the air quantity adjusted coefficient K for the total pipeline being connected with four test pipes is obtained by procedure below：
The air quantity adjusted coefficient K for the total pipeline being connected with four test pipes is calculated by formula (8)
K=Q∑n/Qsb (8)
Wherein, Q∑nFor boiler draft test in certain four test pipe air quantity and；
Q∑n=Σ Qn (6)
Qn=3600 × An×Vn (5)
QnThe air quantity of certain root test pipe in being tested for boiler draft；
AnThe sectional area of certain root test pipe in being tested for boiler draft；
VnThe wind speed of test pipe is tested for certain root of boiler draft experiment；
The quantity of n expression test pipes, and n=1,2,3,4；
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<mn>273</mn>
<mo>+</mo>
<mi>t</mi>
</mrow>
</mfrac>
<mo>&times;</mo>
<mfrac>
<mrow>
<msub>
<mi>p</mi>
<mi>a</mi>
</msub>
<mo>+</mo>
<msub>
<mi>p</mi>
<mi>s</mi>
</msub>
</mrow>
<mn>101325</mn>
</mfrac>
</mrow>
</msqrt>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>7</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, QsbFor the air quantity for the air quantity of total pipeline being connected with four test pipe porch；
A is the sectional area for the total pipeline being connected with four test pipe porch；
KsbFor the coefficient that dispatches from the factory of differential pressure device on the total pipeline that is connected with four test pipe porch；
PdFor the differential pressure in certain root test pipe of boiler draft experiment；
ρ0For the atmospheric density under standard state；
paFor local atmospheric pressure；
psFor the static pressure in certain root test pipe section of boiler draft experiment；
T is the gas flow temperature in certain root test pipe of boiler draft experiment.
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Cited By (1)
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| CN115406660A (en) * | 2022-08-18 | 2022-11-29 | 中国航空工业集团公司北京长城计量测试技术研究所 | Distributed data acquisition device and speed cloud picture data processing system |
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