CN109813400A - Boiler main steam flow meter based on technology of Internet of things checks test macro online - Google Patents
Boiler main steam flow meter based on technology of Internet of things checks test macro online Download PDFInfo
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Abstract
The present invention provides a kind of boiler main steam flow meter based on technology of Internet of things and checks test macro online, including data acquisition unit, wireless transmission unit and data processing unit, it includes boiler furnace ignition temperature that data acquisition unit, which obtains, boiler water level, boiler flue gas flow, boiler feed temperature and pressure and flow, boiler blow-off coolant-temperature gage and flow, basic data including the vapor (steam) temperature and pressure and flow of main steam flow meter, basic data is transferred to data processing unit by wireless transmission unit, data processing unit calculates the calculated value of main steam flow according to mass balance approach after carrying out figure adjustment to the basic data of transmission and is compared with flowmeter indicating value and carries out warning note when error is beyond setting limits, and it obtains integrated flow rate proportionality coefficient and check amendment is carried out to main steam flow meter indicating value in real time.The application is able to satisfy industry spot and quickly carries out judgement and online check to main steam flow meter accuracy, realizes that steam flow accurately measures.
Description
Technical field
The present invention relates to field of measuring techniques, and in particular to a kind of boiler main steam flow meter based on technology of Internet of things exists
Line checks test macro.
Background technique
Steam is the important carrier of thermal energy, not only can directly participate in production process as a kind of important secondary energy sources
Chemical reaction can also generate energy or acting using its thermal energy.Since steam has, clean and environmental protection, efficiency are high, can transmit
Feature, in the daily life for having been widely used for industrial production and the people.The common operating pressure of industrial steam be 0.26~
9.80MPa, temperature are 150~500 DEG C.According to state difference, steam can be divided into superheated steam, saturated vapor and moist steam three
Class.Since steam condition complexity and its unique physical characteristic make steam flow measurement work, there are certain difficulty.Therefore,
The accuracy of steam measurement is improved, accurately and reliably data on flows is obtained, reinforces steam measurement management, steaming is rationally utilized to China
Vapour resource, promotion is energy-saving very important meaning.
The steam flow that steam-flow meter is determined mainly for physical state is measured, when operating condition (temperature, pressure) is sent out
When changing, it is possible to because transformed band carrys out measurement error, especially for moist steam, be usually present indeterminable problem.It steams
The operation conditions that accurately and reliably not only can accurately reflect user's energy consumption, monitor heat energy system of vapour metering, and can be realization thermal energy
Reasonable distribution, the optimum operation of therrmodynamic system, energy consumption equipment carry out energy consumption assessment and steam energy energy-saving transformation mentions
It for reliable technical basis, and is also the basis for guaranteeing that steam trade settlement is fair and just.
The calibration method of steam-flow meter can generally be subdivided into the direct method of measurement and the indirect method of measurement, and the direct method of measurement is also known as
Standardization is flowed to be real, it is necessary to it is realized by flow standard device, refers to the flow for measuring tested flowmeter with normal flow, it will
The two indicating value is compared, and obtains a kind of measurement method of tested flowmeter accuracy；Indirect measurement method be by measurement with
The related physical quantity of flow, calibrated fluxes magnitude obtains a kind of method of corresponding accuracy indirectly.
Currently, steam measurement generally uses differential pressure flowmeter, according to JJG640-1994 " differential pressure flowmeter " calibrating rule
The calibrating of calibration method as defined in journey: disassembling differential pressure transmitter and pressure transmitter respectively, and metrological service is sent to simulate
Static verification is measured, and is examined and determine in isolation differential pressure transmitter or pressure transmitter, to orifice plate, integrating instrument and display
Substantially do not examine that (especially as the orifice plate of primary element, the variation of geometric dimension directly affects the accurate of steam flow measurement
Property, but since disassembly is difficult, it is primary that the usual several years is difficult to Inspection and maintenance).In addition, differential pressure transmitter, pressure transmitter are static
It examines and determine, does not conform to the actual conditions used in calibrating instead of medium (water and air) or input current inspection point parameter is completed with analog quantity
Calibrating.Therefore, there is no the metering performances for examining and determine differential pressure flowmeter for the calibration method of traditional differential pressure flowmeter, and are only
Calibrating analog quantity is examined and determine to substitute, and differential pressure flowmeter is in unknown state to the actual conditions of steam measurement.Therefore steam stream
Measurement is not allowed to be generally existing and urgent problem to be solved.
Traditional differential pressure flowmeter needs to form one by throttling set, impulse pipeline, differential pressure transmitter, flow integrator
A complete Flow Measuring System.Pressure transmitter is also needed to configure for the measurement of gas flow, temperature transmitter carries out temperature
Pressure compensation.As a kind of classical flow measurement utensil, orifice flowmeter is combined by several separate units, they
Between configuration rationally whether, installation whether standardize the accuracy of measurement that can all directly affect orifice plate.Orifice flowmeter longtime running
Abrasion causes orifice plate acute angle rust, studies have found that orifice plate, which runs first 1 year annual abrasion radius, increases 0.04mm, needs five
Just tend to stablize after 6 years, accuracy of measurement is caused not can guarantee.For example during boiler start/ stop, due to residual in jet chimney
The condensed water deposited can generate water hammer, it is also possible to orifice plate be caused to deform.There is inevitable " acute angle abrasions " and " product for orifice plate
It is dirty " problem, with using the increase discharge coefficient of time increasing, instrument indication value is smaller and smaller, the higher occasion of flow velocity, this
Kind variation is even more surprising.Furthermore longer using the time, the zero point of transmitter may drift about, if it is negative drift, display
Differential pressure will reduce, the flow of display can also reduce.Therefore the orifice plate in orifice flowmeter need to be inspected periodically, cleans and be detected
Geometric dimension, and steam measurement condition is harsh, management not enough, is difficult periodic inspection, causes the orifice plate on many stoichiometric points in addition
Management is lost for a long time after flowmeter installation, as a result, causing very big waste again without real solving practical problems.
Currently, orifice flowmeter mainly carries out uncertainty control to secondary meter and metering orifice plate using dry inspection method
System.And be mainly to examine in the week carried out annually to orifice plate, secondary meter and flow computer using " dry inspection " geometric measurement method,
It assesses the systematic uncertainty of a whole set of orifice flowmeter, but the error that factors above generates cannot be carried out qualitative, quantitative
Analysis, to resulting deviation, cannot be given therefore, it is impossible to quantitatively determine the overall uncertainty of a whole set of metering device completely
Correction factor that is reasonable out, determining.
Online check for steam-flow meter is the key that carry out energy-saving, solution flowmeter accuracy decline
It lifts, plays the role of good check and correction for the metering of industrial life vapour, measurement error bring dispute etc. can be eliminated.Cause
This studies a kind of reliable, simple, online detection method, how under the big good development situation that country carries out energy auditing
As produce and consumption steam enterprise there is an urgent need to.
Summary of the invention
Send the calibrating of third party metrological service, calibration more difficult for existing boiler main steam flow meter, and the prior art
It is difficult to the technical issues of meeting to its online check demand, cannot achieve rapid and convenient assay calibration, the present invention provides a kind of base
Check test macro online in the boiler main steam flow meter of technology of Internet of things, the system by Internet of Things acquisition boiler operatiopn,
The operating parameter of boiler water supplement system, main steam flow meter, based on boiler steam system mass balance principle realize boiler
Main steam flow meter is checked online.
In order to solve the above-mentioned technical problem, present invention employs the following technical solutions:
Boiler main steam flow meter based on technology of Internet of things checks test macro, the boiler main steam flow meter online
Refer to the steam-flow meter on industry spot gas fired-boiler main steam line, the system comprises data acquisition units, wireless biography
Defeated unit and data processing unit；Wherein,
The data acquisition unit includes boiler furnace ignition temperature, boiler water level, boiler flue gas flow, pot for obtaining
Furnace feed temperature and pressure and flow, boiler blow-off coolant-temperature gage and flow, the vapor (steam) temperature of main steam flow meter and pressure and stream
Basic data including amount；
The wireless transmission unit includes wireless sending module and wireless receiving module, and the wireless sending module is used for will
The various basic datas of data acquisition unit acquisition are sent, and the wireless receiving module is for receiving various basic datas simultaneously
It is transferred to data processing unit；
The data processing unit includes data server and display, and the data server is used for wireless receiving mould
After the various basic datas of block transmission carry out figure adjustment, the meter of main steam line steam flow is calculated according to mass balance approach
Calculation value is simultaneously compared with main steam flow meter own traffic indicating value, when main steam flow calculated value and indicating value it is opposite
When error is beyond setting limits, warning note is highlighted and carried out to relevant parameter, and combine main steam flow
Meter historical data analysis and assessment provide the probability of main steam flow meter performance decline or inaccuracy, and in main steam flow meter
In range or common measures range, obtains boiler and steam under the conditions of system stable operation integrated flow rate proportionality coefficient f for real-time
On-line amending is carried out to indicating value, the display is carried out for various basic datas received to data server and result data
Centralized displaying.
Further, the data acquisition unit includes for obtaining boiler furnace ignition temperature, being situated between in boiler feedwater pipeline
The temperature sensor of steam medium temperature in matter temperature, boiler blowdown water pipeline internal medium temperature and main steam line, for obtaining
The water level sensor for taking boiler drum water level, for obtaining boiler flue gas consumption, boiler feedwater flow, boiler blow-off water flow
With the flowmeter of steam flow in main steam line, and for obtaining pressure medium and main steam line in boiler feedwater pipeline
The pressure sensor of interior steam medium pressure.
Further, the temperature sensor is thermal resistance or thermocouple.
Further, the flow is calculated as orifice flowmeter, electromagnetic flowmeter or vortex-shedding meter.
Further, the wireless sending module and wireless receiving module are WIFI module, ZigBee module or GPRS module.
Further, described when the relative error of the calculated value of main steam flow and indicating value is beyond setting limits, it is right
Relevant parameter is highlighted and is carried out warning note, and provides the master in conjunction with the historical data analysis and assessment of main steam flow meter
The probability of the decline of steam-flow meter performance or inaccuracy, and in the range of main steam flow meter or common measures range, it obtains
Boiler steams under the conditions of system stable operation integrated flow rate proportionality coefficient f for while being modified in real time to indicating value, described
Data server further includes the mathematical control model according to Historical Monitoring data and internal build, passes through experts database in fuzzy algorithmic approach
Judgement causes the reason of main steam flow meter indicating value monitoring data exception, and according to the meter of the demand of steam and main steam flow
The real-time monitoring of calculation value provides the adjustment feedback strategy of boiler continuous and steady operation.
Further, the integrated flow rate proportionality coefficient f is specifically included: according to the range of main steam flow meter or often
With measures range, n flow capacity checking point i is chosen, each flow point reads data no less than three times, is averaged to obtain each stream
Amount checks the feedwater flow G of point0iWith blowdown water flow G1iDifference G0i-G1iAnd main steam flow Vi；Calculate each flow point i's
Proportionality coefficient fi=(G0i-G1i)/Vi；If the proportionality coefficient f of each flow point iiClose to it is linear when, by each point weight λiCalculate one
A integrated flow rate proportionality coefficient f corrects main steam flow meter indicating value to be fitted,
Compared with prior art, the boiler main steam flow meter provided by the invention based on technology of Internet of things checks survey online
Test system, it is preferred that emphasis is realize by technology of Internet of things from boiler feedwater flow meter to boiler main steam line steam-flow meter
Operating parameter, the data of sensor perception acquire, and realize and pass through water supply according to mass balance approach under steady working condition operating condition
Flow and sewerage flowmeter calculate main steam line steam flow, and are compared analysis with the indicating value of main steam flow meter,
To judge the metering performance of main steam flow meter, to realize that the online check to main steam flow meter meter characteristic is evaluated.Specifically
Ground, in order to realize boiler main steam line main steam flow meter indicating value online check, mainly by sensor temperature collection,
Then the basic datas such as pipeline pressure, flow and boiler water level, gas consumption arrive rear end by wireless transmission
Data server analysis platform, mass of medium EQUILIBRIUM CALCULATION FOR PROCESS and monitoring in carry out system, calculate main steam flow magnitude and with show
Value compares the performance to judge main steam flow meter, provide optimal control reference policy realize main steam line steam
Line checks function, and provides alarm signal when main steam flow meter meter characteristic deviates relative error threshold value；On the other hand, lead to
Each operating parameter real time monitoring for crossing system, understands boiler combustion operation and steam produces degree of stability, and provides corresponding
Control strategy provides data supporting for the steam control of system stable operation and steam quality of boiler.Therefore, boiler main steam flow
The online check of meter indicating value can satisfy industry spot and quickly judge the accuracy of main steam flow meter, eliminates and tears open
The trouble for unloading inspection played an important role in terms of guaranteeing instrument performance and increasing economic efficiency.
Detailed description of the invention
Fig. 1 is that the boiler main steam flow meter provided by the invention based on technology of Internet of things checks test system structure online
Schematic diagram.
Fig. 2 is tubular boiler evaporating schematic diagram provided by the invention.
Fig. 3 is check transmission of quantity value schematic diagram provided by the invention.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Conjunction is specifically illustrating, and the present invention is further explained.
In the description of the present invention, it is to be understood that, term " longitudinal direction ", " radial direction ", " length ", " width ", " thickness ",
The orientation of the instructions such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" or
Positional relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplification of the description, without
It is that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore not
It can be interpreted as limitation of the present invention.In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or two
More than.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
It please refers to shown in Fig. 1, the present invention provides a kind of boiler main steam flow meter based on technology of Internet of things and checks online
Test macro, the boiler main steam flow meter refer to the steam-flow meter on industry spot gas fired-boiler main steam line, one
As be located at boiler rear end and be located at sub-cylinder before, this checks the capital equipment that test macro is related to online or device includes pot
Furnace feedwater piping, boiler body, boiler blow-off waterpipe and boiler steam pipe, the system comprises data acquisition units, nothing
Line transmission unit and data processing unit；Wherein,
The data acquisition unit includes boiler furnace ignition temperature, boiler water level, boiler flue gas flow, pot for obtaining
Furnace feed temperature and pressure and flow, boiler blow-off coolant-temperature gage and flow, the vapor (steam) temperature of main steam flow meter and pressure and stream
Basic data including amount；
The wireless transmission unit includes wireless sending module and wireless receiving module, and the wireless sending module is used for will
The various basic datas of data acquisition unit acquisition are sent, and the wireless receiving module is for receiving various basic datas simultaneously
It is transferred to data processing unit；
The data processing unit includes data server and display, and SQL data are equipped in the data server
There is data storage, data to show and control tune for library and the Data Analysis Platform built by computer technology tower, the analysis platform
The functions such as section, after the various basic datas that the data server is used to transmit wireless receiving module carry out figure adjustment, root
The calculated value of main steam line steam flow is calculated according to mass balance approach and is carried out with main steam flow meter own traffic indicating value
Compare analysis, when the relative error of the calculated value of main steam flow and indicating value beyond setting limits when, to relevant parameter into
Row highlights and carries out warning note, and provides the main steam flow meter in conjunction with the historical data analysis and assessment of main steam flow meter
The probability of performance decline or inaccuracy, and in the range of main steam flow meter or common measures range, acquisition boiler, which steams, is
Unite stable operation under the conditions of integrated flow rate proportionality coefficient f in real time to indicating value carry out on-line amending, the display for pair
The received various basic datas of data server and result data carry out centralized displaying.
Specifically, the data server to various basic datas carry out figure adjustment include: appreciable error rejecting and
Data harmonization disposes random error in measurement data etc., and specific figure adjustment treatment process belongs to those skilled in the art
Routine techniques known to member, thus details are not described herein；Then it using through figure adjustment treated data, steams according to boiler
Mass balance relationship in system between boiler feedwater, discharging of boiler and Boiler Steam calculates the main steam matter of generation in real time
Measure flow；Then to the calculated value V of main steam mass flowjsReal-time monitoring is carried out with main steam flow meter indicating value V, is calculated simultaneously
Relative error between the two out, this relative error are error rate δ=(V-V of main steam flow meterjs)/Vjs× 100%；
Main steam flow meter performance inaccuracy can be tentatively judged when relative error is beyond setting limits, dashed forward to relevant parameter
Warning note is shown and carried out out, and provides the main steam flow meter performance in conjunction with the historical data analysis and assessment of main steam flow meter
It is steady to obtain boiler system of steaming and in the range of main steam flow meter or common measures range for the probability of decline or inaccuracy
Determine under service condition integrated flow rate proportionality coefficient f for being modified in real time to indicating value, thus realize main steam flow meter
Line is checked.
As specific embodiment, the data acquisition unit includes: for obtaining boiler furnace ignition temperature, boiler feedwater
The temperature sensing of steam medium temperature in pipeline internal medium temperature, boiler blowdown water pipeline internal medium temperature and main steam line
Device, the temperature of pipeline internal medium, boiler blowdown water before wherein medium temperature refers into boiler drum in boiler feedwater pipeline
Pipeline internal medium temperature refers to the temperature of pipeline internal medium after boiler blow-off pipeline or drain valve, steam medium in main steam line
Temperature refers to temperature when water supply conveys in main steam line after boiler thermal conversion is steam, the temperature sensing utensil
Body can acquire data using existing thermal resistance or thermocouple temperature sensor, and precision is not less than 0.5 grade, and passes through company
Bound transmission is to wireless sending module；For obtaining the water level sensor of boiler drum water level, value can be according to boiler drum
Water level how much constantly show and acquire transmission；For obtaining boiler flue gas consumption, boiler feedwater flow, boiler blow-off water flow
The flowmeter of steam flow in amount and main steam line, wherein the flowmeter for obtaining boiler flue gas consumption is installed on boiler
On fuel channel, and if have the flowmeters of other forms on the pipeline of boiler feedwater and boiler blowdown water, can be with after calibrated
The flowmeter of other forms is directlyed adopt to acquire its data on flows signal, for obtaining the stream of steam flow in main steam line
Meter is installed on main steam line, and the flowmeter can specifically use orifice flowmeter, electromagnetic flowmeter or flux of vortex street
Meter is not less than 1% for measuring the testing flow meter precision of steam under calibration state, for testing the flow of water flow to acquire
It counts measuring accuracy and is not less than 0.5%；For obtaining in boiler feedwater pipeline steam medium pressure in pressure medium and main steam line
The pressure sensor of power is acquired by the pressure data that the pressure sensor can flow pipeline internal medium, and is acquired
The vapor (steam) temperature and pressure arrived is used to carry out density compensation to main steam flow meter, accurately to obtain main steam mass flow.
As a preferred embodiment, according to calibration principle, the class of accuracy of boiler feedwater flow meter and blowdown water ga(u)ge
Need to select the flowmeter of higher level, bonded boiler scene, the electromagnetic flowmeter preferably uses 0.5 grade of Electromagnetic Flow to be counted as
It is used to check standard scale online, can meet the needs of check.
As specific embodiment, the wireless transmission unit is that technology of Internet of things is adopted for checking test macro data online
The key point of collection, the wireless transmission unit are made of wireless sending module and wireless receiving module, the wireless transmission mould
Block and wireless receiving mold can be using WIFI module, ZigBee module or GPRS module etc., i.e., the described wireless sending modules
The transmitting-receiving transmission of wireless signal can be realized by WIFI module, ZigBee module or GPRS module between wireless receiving mould.
It is described when the calculated value of main steam flow and the relative error of indicating value exceed setting limit value model as specific embodiment
When enclosing, warning note is highlighted and carried out to relevant parameter, and combine the historical data analysis and assessment of main steam flow meter
The probability of main steam flow meter performance decline or inaccuracy is provided, and in the range of main steam flow meter or common measures range
It is interior, it is same for being modified in real time to indicating value to obtain the boiler integrated flow rate proportionality coefficient f under the conditions of system stable operation that steams
When, the data server further includes the mathematical control model according to Historical Monitoring data and internal build, passes through fuzzy algorithmic approach
Middle experts database judgement causes the reason of main steam flow meter indicating value monitoring data exception, and according to the demand and main steam of steam
The real-time monitoring of the calculated value of flow, provides the adjustment feedback strategy of boiler continuous and steady operation, and specific strategy includes adjustment pot
Furnace feedwater flow and adjustment fuel gas supply amount etc., it is ensured that online test macro of checking meets precondition；Wherein, cause main steam
The reason of flowmeter indicating value monitoring data exception includes: the flow sensor element performance decline of (1) main steam flow meter instrument
Caused vapour volume flow measurement is inaccurate；(2) vapour density caused by vapor (steam) temperature or pressure measurement sensor metering are inaccurate
Compensation is inaccurate；(3) boiler steams, and system is unstable to cause the fluctuation of main steam flow meter indicating value excessive；(4) other distracters.Specifically
Ground, the SQL database installed and the Data Analysis Platform built by computer technology tower in the data server, can basis
The data acquisition unit real-time online acquires boiler feedwater flow G0, boiler blow-off water flow G1With main steam line flowmeter
Indicating value V and other be used for modified flow rate parameter, such as feed temperature T0, feed pressure P0, vapor (steam) temperature in main steam line
T and steam medium pressure P and boiler operatiopn ignition temperature θ and boiler drum water level H realizes computer automatically according to quality
Equilibrium relation calculate main steam line steam flow calculated value, and with steam-flow meter itself display flow indicating value carry out when
When comparative analysis, when error carries out warning note beyond setting limits or when threshold value, and can be assessed in conjunction with historical data
The probability of main steam flow meter performance decline or inaccuracy when calculated value and the error of indication are bigger than normal is analyzed, while using comprehensive
Interflow measures proportionality coefficient and realizes the online purpose for checking test of main steam flow meter, while enterprise being facilitated to understand boiler carbonated drink system
The practical operation situation of system.
As it is known to those skilled in the art that the water of liquid enters by being become the steam of steam state by thermal evaporation after boiler,
It is only two kinds of different shapes and the transformation of different conditions parameter of water, this is to measure the main steaming of boiler using Water Vapor Quality equilibrium equation
The mass measurement of steam flow meter provides material conditions.Therefore, feedwater flow and the blowdown using high accuracy grade are inquired into
Water flow is theoretically feasible in the method for industry spot on-line calibration main steam flow meter indicating value.Specifically, theoretically
Water Vapor Quality balance be derived by by following mathematical physics process:
It please refers to shown in Fig. 2, considers the areas of dielectric for surrounding water level line in water-cooling wall tedge and tube wall as control
The import medium of body τ, control volume τ are tedge water supply Mj, outlet medium is the steam M generatedq, and it is false to make following steady working condition
If: within the t time, in boiler operatiopn, fluid media (medium) continuously flows in each pipeline of boiler circuit, and boiler water bit line keeps stablizing not
Become, pressure is constant in boiler upper collecting chamber, and the feed pressure and feed temperature of lower header are constant.Then become according to control volume carbonated drink quality
Change can obtain following correlation:
In formula, MjFor feed-water quality flow, units/kg/s；MqFor the band entered above water level line, steam outlet pipe is drawn
There are the saturated vapor mass flow of humidity, units/kg/s；For variation of the mass of medium within the t time in control volume τ
Amount, units/kg/s；ρ is Media density；V is the volume of control volume τ；DV is the differential expression to volume.
Analysis steams process it is found that in boiler operatiopn, during boiler circuit fluid media (medium) continuously flow, category level pressure saturated vapor
The temperature of process, saturated-steam temperature and saturated water is constant.Then in the t time, the steam steam bubble volume that produces in control volume τ and
Steam bubble density is constant, i.e. steam bubble mass conservation, and when water level line is constant, the constant total volume under control volume τ, then in control volume τ
Liquid water constancy of volume.When again because of feed pressure, feed temperature and steam pressure constant, the density of liquid water is in control volume τ
It is constant, then liquid water constant mass under control volume τ.Liquid water quality and steam bubble quality i.e. in the t time in control volume τ are
It is constant, i.e.,Then formula (1) can transform to:
Formula (2) reflects boiler and stablizes that constant feed pressure and feed temperature, water level line position be constant, steam a certain
In the constant boiler operatiopn operating conditions body τ of pressure, feed-water quality flow is equal with the steam mass flow of generation.It can similarly push away
It is disconnected, if after control volume is extended to the control volume including lower header, tedge and upper collecting chamber, can be obtained by formula (2):
V=G0-G1Formula (3)
In formula, G0For the accumulated quality flow for passing through feed meter in given time t, units/kg；G1To be arranged by boiler
The accumulated quality flow of sewage flowmeter, units/kg；V is the accumulated quality flow of boiler main steam flow meter, units/kg.
Formula (3) indicate under steady working condition control condition, in same time, one with lower header feed-water quality flow be into
Mouth continuously flows tubular boiler steam and water circuit, system with the enclosed that upper collecting chamber steam mass flow and water amount of blowdown are outlet
The steam mass flow transferred out is equal to the sewerage quality stream that the outflow system is deducted into the feed-water quality flow of the system
Amount, here it is the boiler steam mass balance equations under steady working condition control condition.Therefore, measuring water flow technology maturation, behaviour
Work is convenient, measurement accuracy is guaranteed, can be used as the canonical reference for checking steam.
When industry spot is checked, in order to ensure the accuracy of check, it is necessary to meet following condition for boiler operatiopn:
(1) ensure that boiler steam and water circuit must be autonomous system, stop the operation such as chemical sampling water, medicine adding, each valve of boiler
The tight No leakage of door；
(2) boiler working condition parameter is basicly stable, avoids biggish fluctuation, if gas supply is stablized, to reduce firing optimization
Influence；Any operation for not allowing interference boiler working condition occur, such as safety valve open jump, boiler load adjustment operation；Pass through
Control system linkage correspondinglys increase feedwater flow when there is sewerage outflow variation, it is ensured that liquid-vaqor interface remains steady in tedge
It is fixed.The main thermal parameter undulating value of boiler is no more than the permissible value recommended such as the following table 1:
Boiler working condition fluctuates permissible value when table 1 is checked online
Stable operation of the boiler for a period of time after, while measuring feedwater flow, blowdown water flow and main steam flow, obtain one
Determine the difference G of the feedwater flow and blowdown water flow under parameter0-G1With the integrated flow rate ratio system between main steam flow meter indicating value V
Number f, to obtain the correction value V' of main steam flow meter indicating value V.So it is transmitted to by the feedwater flow of high accuracy grade
Main steam flow meter indicating value reaches online and checks purpose, checks transmission of quantity value schematic diagram and sees attached drawing 3.
As specific embodiment, boiler main steam flow meter is checked online to be completed according to the following steps, i.e., the described synthesis
Flow proportional coefficient f's is specifically included: according to the range of main steam flow meter or common measures range, choosing n flow
Point i is checked, each flow point reads data no less than three times, is averaged to obtain the feedwater flow G of each flow capacity checking point0iWith
Blowdown water flow G1iDifference G0i-G1iAnd main steam flow meter indicating value Vi；Calculate the proportionality coefficient f of each flow point ii=(G0i-
G1i)/Vi；If the proportionality coefficient f of each flow point iiClose to it is linear when, by each point weight λiCalculate an integrated flow rate ratio system
Number f corrects main steam flow meter indicating value to be fitted,
In conclusion can be by data processing unit to the flow of boiler main steam line by Water Vapor Quality equilibrium equation
Meter is constantly corrected, and is provided modified accurate calculated value and compared with main meter indicating value, so that it may be analyzed
Judge main meter metering performance accuracy and repeatability how, achieve the purpose that main steam flow meter checks test online.
Compared with prior art, the boiler main steam flow meter provided by the invention based on technology of Internet of things checks survey online
Test system, it is preferred that emphasis is realize by technology of Internet of things from boiler feedwater flow meter to boiler main steam line steam-flow meter
Operating parameter, the data of sensor perception acquire, and realize and pass through water supply according to mass balance approach under steady working condition operating condition
Flow and sewerage flowmeter calculate main steam line steam flow, and are compared analysis with the indicating value of main steam flow meter,
To judge the metering performance of main steam flow meter, to realize that the online check to main steam flow meter meter characteristic is evaluated.Specifically
Ground, in order to realize boiler main steam line main steam flow meter indicating value online check, mainly by sensor temperature collection,
Then the basic datas such as pipeline pressure, flow and boiler water level, gas consumption arrive rear end by wireless transmission
Data server analysis platform, mass of medium EQUILIBRIUM CALCULATION FOR PROCESS and monitoring in carry out system, calculate main steam flow magnitude and with show
Value compares the performance to judge main steam flow meter, provide optimal control reference policy realize main steam line steam
Line checks function, and provides alarm signal when main steam flow meter meter characteristic deviates relative error threshold value；On the other hand, lead to
Each operating parameter real time monitoring for crossing system, understands boiler combustion operation and steam produces degree of stability, and provides corresponding
Control strategy provides data supporting for the steam control of system stable operation and steam quality of boiler.Therefore, boiler main steam flow
The online check of meter indicating value can satisfy industry spot and quickly judge the accuracy of main steam flow meter, eliminates and tears open
The trouble for unloading inspection played an important role in terms of guaranteeing instrument performance and increasing economic efficiency.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (7)
1. the boiler main steam flow meter based on technology of Internet of things checks test macro online, the boiler main steam flow meter is
Refer to the steam-flow meter on industry spot gas fired-boiler main steam line, which is characterized in that the system comprises data acquisition is single
Member, wireless transmission unit and data processing unit；Wherein,
The data acquisition unit is given for obtaining including boiler furnace ignition temperature, boiler water level, boiler flue gas flow, boiler
Coolant-temperature gage and pressure and flow, boiler blow-off coolant-temperature gage and flow, the vapor (steam) temperature of main steam flow meter and pressure and flow exist
Interior basic data；
The wireless transmission unit includes wireless sending module and wireless receiving module, and the wireless sending module is used for data
The various basic datas of acquisition unit acquisition are sent, and the wireless receiving module is for receiving various basic datas and transmitting
To data processing unit；
The data processing unit includes data server and display, and the data server is used to pass wireless receiving module
After defeated various basic datas carry out figure adjustment, the calculated value of main steam line steam flow is calculated according to mass balance approach
And be compared with main steam flow meter own traffic indicating value, when the calculated value of main steam flow and the relative error of indicating value
When beyond setting limits, warning note is highlighted and carried out to relevant parameter, and go through in conjunction with main steam flow meter
The analysis of history data assessment provides the probability of main steam flow meter performance decline or inaccuracy, and in the range of main steam flow meter
Or in common measures range, obtains boiler and steam under the conditions of system stable operation integrated flow rate proportionality coefficient f in real time to showing
Value carries out on-line amending, and the display is concentrated for various basic datas received to data server and result data
Display.
2. the boiler main steam flow meter according to claim 1 based on technology of Internet of things checks test macro online,
Be characterized in that, the data acquisition unit include for obtaining boiler furnace ignition temperature, medium temperature in boiler feedwater pipeline,
The temperature sensor of steam medium temperature in boiler blowdown water pipeline internal medium temperature and main steam line, for obtaining boiler pot
The water level sensor of cylinder water level, for obtaining boiler flue gas consumption, boiler feedwater flow, boiler blow-off water flow and main steam
The flowmeter of steam flow in pipeline, and steam is situated between in pressure medium and main steam line in boiler feedwater pipeline for obtaining
The pressure sensor of matter pressure.
3. the boiler main steam flow meter according to claim 2 based on technology of Internet of things checks test macro online,
It is characterized in that, the temperature sensor is thermal resistance or thermocouple.
4. the boiler main steam flow meter according to claim 1 based on technology of Internet of things checks test macro online,
It is characterized in that, the flow is calculated as orifice flowmeter, electromagnetic flowmeter or vortex-shedding meter.
5. the boiler main steam flow meter according to claim 1 based on technology of Internet of things checks test macro online,
It is characterized in that, the wireless sending module and wireless receiving module are WIFI module, ZigBee module or GPRS module.
6. the boiler main steam flow meter according to claim 1 based on technology of Internet of things checks test macro online,
It is characterized in that, it is described when the relative error of the calculated value of main steam flow and indicating value is beyond setting limits, to corresponding ginseng
Number is highlighted and is carried out warning note, and provides the main steam flow in conjunction with the historical data analysis and assessment of main steam flow meter
The probability of the decline of meter performance or inaccuracy, and in the range of main steam flow meter or common measures range, it obtains boiler and produces
Integrated flow rate proportionality coefficient f is for while being modified in real time to indicating value, the data to be taken under the conditions of vapour system stable operation
Business device further includes the mathematical control model according to Historical Monitoring data and internal build, is drawn by experts database judgement in fuzzy algorithmic approach
The reason of main steam flow meter indicating value monitoring data exception is played, and according to the calculated value of the demand and main steam flow of steam
Real-time monitoring provides the adjustment feedback strategy of boiler continuous and steady operation.
7. the boiler main steam flow meter according to claim 1 based on technology of Internet of things checks test macro online,
It is characterized in that, the integrated flow rate proportionality coefficient f's is specifically included: according to the range of main steam flow meter or common metering
Range, chooses n flow capacity checking point i, and each flow point reads data no less than three times, is averaged to obtain each flow capacity checking
The feedwater flow G of point0iWith blowdown water flow G1iDifference G0i-G1iAnd main steam flow meter indicating value Vi, calculate each flow point i's
Proportionality coefficient fi=(G0i-G1i)/Vi；If the proportionality coefficient f of each flow point iiClose to it is linear when, by each point weight λiCalculate one
A integrated flow rate proportionality coefficient f corrects main steam flow meter indicating value to be fitted,
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| CN111352400A (en) * | 2020-03-13 | 2020-06-30 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Heat supply unit sliding pressure operation optimization method and sliding pressure operation control system |
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| CN111982245A (en) * | 2020-07-13 | 2020-11-24 | 中广核核电运营有限公司 | Method and device for calibrating main steam flow, computer equipment and storage medium |
| CN112461340A (en) * | 2020-12-03 | 2021-03-09 | 上海普适导航科技股份有限公司 | Fault correcting and detecting method and device for water level meter |
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| CN111649808A (en) * | 2020-05-29 | 2020-09-11 | 江苏德高物联技术有限公司 | SCADA-based water supply network flow instrument adaptation rationality analysis method |
| CN111649808B (en) * | 2020-05-29 | 2022-07-01 | 江苏德高物联技术有限公司 | SCADA-based water supply network flow instrument adaptation rationality analysis method |
| CN111982245A (en) * | 2020-07-13 | 2020-11-24 | 中广核核电运营有限公司 | Method and device for calibrating main steam flow, computer equipment and storage medium |
| CN112461340A (en) * | 2020-12-03 | 2021-03-09 | 上海普适导航科技股份有限公司 | Fault correcting and detecting method and device for water level meter |
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| CN114922707A (en) * | 2022-02-09 | 2022-08-19 | 华能曲阜热电有限公司 | Industrial steam supply flow automatic adjusting device |
| CN114580214A (en) * | 2022-05-05 | 2022-06-03 | 常州艾肯智造科技有限公司 | Intelligent steam flowmeter checking and testing system and method based on Internet of things |
| CN114580214B (en) * | 2022-05-05 | 2022-07-22 | 常州艾肯智造科技有限公司 | Intelligent steam flowmeter checking and testing system and method based on Internet of things |
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