CN105807027B - gas energy metering method and device - Google Patents
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Abstract
The invention discloses a kind of gas energy metering method and devices, are related to gas dosing field, and the synchronous measurement of flow information and calorific value information may be implemented, and improve metering precision.The gas energy metering method of the present invention, including：The flow and physical parameter for being tested gas are measured, when measurement ensures that the flow of tested gas and physical parameter are derived from same fluid and are obtained in synchronization；And according to the physical parameter measured, the calorific value of tested gas is calculated by the quantitative relationship between gas heating value and physical parameter；According to calculated gas heating value and the gas flow measured, the energy for being tested gas is calculated.
Description
Technical field
The present invention relates to gas dosing field more particularly to a kind of gas energy metering method and devices.
Background technology
Imflammable gas mainly uses the energy discharged after its burning, traditional volume or matter as a kind of fuel, user
Amount metering method is difficult to reflect its energy value.In contrast, the energy meter of imflammable gas is a kind of more fair, more scientific
Metering method, approved by more and more people.
It is generally believed that the energy (E) contained by a certain amount of gas is the product of gas flow (Q) and corresponding calorific value (H), Ke Yitong
Cross gas flow and its calorific value calculation energy.Currently, imflammable gas energy meter generally use terminal flow measurement device measures
Flow, measuring station measurement of caloric value device carries out the measurement of calorific value, then completes energy information by Upper system and calculate.At the two
In different sampling location or there are certain Dose times are poor, and gas in transmission process can because air source component changes and
Lead to the irregular variation of calorific value, so, existing measurement method can not ensure that terminal gas consumption is measured with measuring station calorific value information
Synchronism, cause energy meter to have deviation, especially will bring very large deviation in imflammable gas calorific value frequent fluctuation occasion,
Energy meter precision is low.
Invention content
The present invention provides a kind of measurement method and device of gas energy, and the synchronometer of flow and calorific value information may be implemented
Amount improves metering precision.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that：
A kind of gas energy metering method, including：The flow and physical parameter for being tested gas are measured, tested gas when measurement
Flow and physical parameter be derived from same fluid and synchronization obtain；According to the physical parameter measured, pass through air heat
Quantitative relationship between value and physical parameter calculates the calorific value of tested gas；According to calculated gas heating value and measure
Gas flow calculates the energy for being tested gas.
Preferably, it measures and is tested after the flow and physical parameter of gas, further include before calculating the energy of tested gas：
Using the physical parameter measured, gas flow is modified.
Optionally, if measuring the flow for being tested gas using volume type gas flow surveying instrument；Described utilize measures
The physical parameter, gas flow is modified, including：It is also synchronous when measuring the flow and physical parameter that are tested gas
Measure the temperature and pressure for being tested gas；According to the temperature and pressure of the physical parameter measured, tested gas, obtains and correct to mark
The flow modificatory coefficient of quasi- reference condition：K=(P/P0)×(T0/T)×(Z0/ Z), the standard reference conditions include standard ginseng
Than temperature and standard reference pressure；P0For standard reference pressure, T0For standard reference temperature, P is the gas pressure intensity measured, and T is to survey
The gas temperature obtained, Z0For the compressibility factor of gas under standard reference conditions, Z is in working condition the compressibility factor of lower gas, Z0/Z
It is obtained according to the physical parameter and component information measured；The flow measured is repaiied according to the flow modificatory coefficient of acquisition
Just.
Optionally, if measuring the flow for being tested gas using thermal mass formula gas flow surveying instrument；The utilization
The physical parameter measured, is modified gas flow, specially：For thermal mass formula gas flow surveying instrument,
Obtain flow modificatory coefficient；Gas flow is modified using the flow modificatory coefficient.
Specifically, for thermal mass formula gas flow surveying instrument, flow modificatory coefficient is obtained, including：According to calorific value
The air range being applicable in is measured, several calibrating gas are provided；Reference gas is provided, and to any calibrating gas and described
Reference gas obtains the initial flow signal under preset flow, simultaneously using the thermal mass formula gas flow surveying instrument
Each calibrating gas and the corresponding physical parameter of the reference gas are obtained, the initial flow signal includes flow information；
Find out the flow modificatory coefficient of each calibrating gas：K=U0/ U, K are the flow modificatory coefficient of calibrating gas, U and U0It is respectively default
The initial flow signal of the calibrating gas and the reference gas under flow；According to the flow modificatory coefficient of each calibrating gas and
The corresponding physical parameter obtains the quantitative relationship between flow modificatory coefficient and physical parameter；According to the physical parameter
And the quantitative relationship between flow modificatory coefficient and physical parameter, find out the flow modificatory coefficient of tested gas.
The metering method further includes：Judge whether is sampling time when gas flow measurement and physical parameter measure
It is synchronous；When the determination result is yes, then judge that the measurement period that the measurement period of gas flow measurement is measured with physical parameter is
It is no equal；If it is judged that synchronized for the sampling time, and measurement period is equal, then when calculating the energy of the tested gas：
Energy fluence is first found out according to the gas heating value and the gas flow that measure, then by being integrated to energy fluence
Calculate, obtain in preset time by tested gas energy；If the sampling time synchronizes, but measurement period is unequal, then
When calculating the energy of the tested gas：First judge which the gas flow measurement period and physical parameter measure in measurement period
One is higher value；When calculating the energy for being tested gas, with larger that of measurement period to divide benchmark, to the energy flowed through
Amount carry out subsection integral calculating, obtain by tested gas energy.
Optionally, when judging whether sampling time when gas flow measurement is measured with physical parameter is synchronous, if it is determined that
As a result be no, then before whether the measurement period that the measurement period and physical parameter for judging gas flow measurement measure is equal,
Further include:The sampling time of gas flow measurement or the sampling time of adjustment physical parameter measurement are adjusted, when the two being made to sample
Between it is synchronous.
Preferably, it is carried out by the measurement period of setting when physical parameter measures, further includes holding after each physical parameter measures
The measurement period that the next physical parameter of row following step setting measures：It calculates this and measures corresponding gas heating value；Compare this
Measure the gas heating value that obtained gas heating value is obtained with last time measurement；If the gas heating value that this measurement obtains is equal to last time
Obtained gas heating value is measured, then is adjusted to the value of the measurement period of physical parameter to increase by first on the basis of existing value
Preset time, and judge this adjustment after measurement period value whether exceed preset upper limit value, if it is judged that for beyond,
The measurement period of physical parameter is then set as the preset upper limit value, if the gas heating value that this measurement obtains was surveyed not equal to last time
The value of the measurement period of physical parameter is then adjusted to reduce on the basis of existing value second in advance by the gas heating value measured
If the time, and judge whether the measurement period value after this adjustment exceeds preset lower limit value, if it is judged that for beyond then
The measurement period of physical parameter is set as the preset lower limit value.
Specifically, first preset time and second preset time are the intrinsic gauging period of physical parameter
Integral multiple.
The embodiment of the present invention also provides a kind of gas energy metering device, including：Measuring unit, for measuring tested gas
Flow and physical parameter, the flow of tested gas and physical parameter are derived from same fluid and are obtained in synchronization when measurement
?；Calorific value calculation unit, for according to the physical parameter measured, passing through the quantitative relationship meter between gas heating value and physical parameter
Calculate the calorific value for being tested gas；Energy calculation unit, for according to calculated gas heating value and the gas flow measured, meter
Calculate the energy for being tested gas.
Specifically, the measuring unit includes：Flow measurement module and physical property detection module.
Further, the measuring device further includes：Flow correction unit, for utilizing the physical parameter measured,
Gas flow is modified.
Optionally, if measuring the flow for being tested gas, the measuring device using volume type gas flow surveying instrument
Further include：Temperature sensor and pressure sensor, when flow and physical parameter for measuring tested gas, synchro measure is tested
The temperature and pressure of gas；The flow correction unit includes：Correction factor acquisition module, for according to the physical parameter measured
It calculates, the temperature and pressure of tested gas, obtains the flow modificatory coefficient corrected to standard reference conditions：K=(P/P0)×(T0/
T)×(Z0/ Z), the standard reference conditions include standard reference temperature and standard reference pressure；P0For standard reference pressure, T0
For standard reference temperature, P is the gas pressure intensity measured, and T is the gas temperature measured, Z0For the pressure of gas under standard reference conditions
The contracting factor, Z are in working condition the compressibility factor of lower gas, Z0/ Z is obtained according to the physical parameter and component information measured；It corrects
Module, initial signal or gas flow for being obtained to gas flow test according to the flow modificatory coefficient of acquisition into
Row is corrected.
Optionally, if measuring the flow for being tested gas using thermal mass formula gas flow surveying instrument；The flow
Amending unit includes：Flow modificatory coefficient acquisition module is directed to thermal mass formula gas flow surveying instrument for obtaining, obtains
Flow modificatory coefficient；Correcting module, initial signal for being obtained to gas flow test according to the flow modificatory coefficient or
Person's gas flow is modified.
Specifically, the flow measurement module in the measuring unit, be additionally operable to under preset flow each calibrating gas and
Reference gas measures, and obtains initial flow signal, and the initial flow signal includes flow information, the calibrating gas root
It is determined according to the air range that measurement of caloric value is applicable in；Physical property detection module in the measuring unit is additionally operable to obtain by measuring
Obtain the calibrating gas and the corresponding physical parameter of reference gas；The flow modificatory coefficient acquisition module, including：Calculate submodule
Block, for according to the initial flow signal measured, finding out the flow modificatory coefficient of each calibrating gas：K=U0/ U, K are mark
The flow modificatory coefficient of quasi- gas, U and U0Under respectively default same traffic the calibrating gas and the reference gas just
Beginning flow signal；It is fitted submodule, is used for the flow modificatory coefficient according to the calibrating gas and corresponding physical parameter, is obtained
Quantitative relationship between flow modificatory coefficient and physical parameter；The computational submodule is additionally operable to according to the physical parameter measured
And the quantitative relationship between flow modificatory coefficient and physical parameter, find out the flow modificatory coefficient of tested gas.
Preferably, further include：Judging unit, when for judging that gas flow measurement and physical parameter measure the sampling time be
No synchronization；It is additionally operable to when the determination result is yes, then judges the survey that the measurement period of gas flow measurement is measured with physical parameter
Whether equal measure the period；
If it is judged that synchronized for the sampling time, and measurement period is equal, then the energy calculation unit specifically includes：
First computing module, for finding out energy fluence according to the gas heating value and the gas flow, the second computing module is used
In by carrying out integral and calculating to the energy fluence, obtain in preset time by tested gas energy；If sampling
Time synchronization, but measurement period is unequal, then and the energy calculation unit specifically includes：Judgment module, for judging the gas
Which is higher value, computing module, for calculating tested gas in body flow measurement period and physical parameter measurement measurement period
When the energy of body, with larger that of measurement period to divide benchmark, subsection integral calculating is carried out to the energy flowed through, is obtained
By tested gas energy.
Further, the measuring device further includes：Synchronous adjustment unit, for judging gas flow measurement and physical property
When the sampling time is asynchronous when parameter measurement, the sampling time of gas flow measurement or adopting for adjustment physical parameter measurement are adjusted
The sample time makes the two sampling time synchronize.
Preferably, the physical property detection module is measured the physical parameter for being tested gas by the measurement period of setting, further includes：
Measurement period setting module, for after the measurement of each physical parameter, the measurement period measured next physical parameter to be set
It is fixed；The measurement period setting module includes：Comparison sub-module was surveyed for comparing the gas heating value that this measurement obtains with last time
The gas heating value measured；Submodule is set, the gas heating value for being obtained in this measurement is equal to the gas that last time measurement obtains
When body heat value, the value of the measurement period of physical parameter is adjusted to increase by the first preset time on the basis of existing value；It is no
Then, the value of the measurement period of the physical parameter is adjusted to reduce the second preset time on the basis of existing value；It is described
Comparison sub-module is additionally operable to judge whether the measurement period value after this adjustment exceeds preset upper limit value；And this adjustment
Whether measurement period value afterwards exceeds preset lower limit value；The setting submodule is additionally operable to the measurement after judging this adjustment
When period value exceeds preset upper limit value, the measurement period of the physical parameter is set as the preset upper limit value；Judging this
When measurement period value after adjustment exceeds preset lower limit value, the measurement period of the physical parameter is set as the pre-determined lower limit
Value.
Optionally, the metering device further includes display module, for showing that the energy computation module is calculated
Gas energy.
For the low problem of energy meter precision in existing imflammable gas energy meter method, the present invention provides a kind of
The metering method and device of gas energy, first synchro measure are tested the flow and physical parameter of gas, and synchro measure is meant that
Ensure that the flow of tested gas and physical parameter are derived from same fluid and are obtained in synchronization when measurement；Then joined according to physical property
Number calculates the calorific value of tested gas, and then calculates the energy of the tested gas flowed through, since flow is synchronous with physical parameter
Measure, according to physical parameter calculated calorific value it is also synchronous with the flow measured, the same of flow and calorific value information may be implemented
Step metering, improves metering precision, is particularly suitable for the occasion of gas heating value frequent fluctuation.
Description of the drawings
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to needed in the embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is gas energy metering method flow chart provided in an embodiment of the present invention；
Fig. 2 is the sequence diagram that control is measured in gas energy metering method provided in an embodiment of the present invention；
Fig. 3 is the principle schematic of gas energy metering method provided in an embodiment of the present invention；
Fig. 4 is the structure diagram of gas energy metering device provided in an embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Inventor has found：For a certain gas (refer generally to imflammable gas or containing the mixed gas of imflammable gas, can
Can also be mixed gas to be pure gas) for, the molecule element and structure of each component are different, corresponding to object
Property parameter and calorific value be also not quite similar, each component all exist therewith one-to-one physical parameter and calorific value combination, i.e. component i
Corresponding physical parameter Xi(physical parameter XiCan be thermal conductivity λi, thermal capacitance Cpi, density pi, viscosity, muiOr thermal diffusion coefficient αi,
Can be multinomial in above-mentioned items) and calorific value HiCombination has uniqueness, therefore can pass through the physical parameter of detection gas
Xi, and then according to the relationship between physical parameter and calorific value, to know its corresponding calorific value Hi.Certainly, if object is known in advance
Quantitative relationship between property parameter Xi and calorific value, directly can also obtain gas heating value according to physical parameter.
Based on above-mentioned principle, the embodiment of the present invention provides a kind of gas energy metering method, as shown in Figure 1, including：
101, the flow and physical parameter for being tested gas are measured, the flow of tested gas and physical parameter are derived from when measurement
Same fluid and synchronization obtain；
This step is that tested gas is allowed to simultaneously flow through flow measurement module and measurement of caloric value module, to ensure the acquisition
The flow and physical parameter of tested gas are derived from same fluid and are obtained in synchronization.Wherein, it is tested obtaining for gas flow
The method of obtaining is as follows：Including but not limited to utilize gas flowmeters such as ultrasonic wave, turbine or vortex street, hot type etc. or sensor.This step
Suddenly quilt is measured in real time according to certain sampling period by the flowmeters such as ultrasonic wave, turbine or vortex street (or flow measurement device)
The flow for surveying gas, obtain tested gas by flow.
Specifically, the measurement method that gas physical parameter is tested in this step is as follows：Pass through physical property sensor (preferably microcomputer
Electric system hot type physical property sensor) obtain physical parameter.The physical parameter be specially the thermal conductivity λ of tested gas, thermal capacitance Cp,
The combination of any of density p, viscosity, mu or thermal diffusion coefficient α or multiple physical property.Preferably, during this step physical parameter measures
Thermal conductivity λ and thermal diffusion coefficient α is obtained, gas density ρ and volumetric heat capacity Cp is either obtained or obtains thermal conductivity λ, level pressure heat
Hold Cp and density p etc..This step is tested the physical parameter of gas according to certain sampling period detection simultaneously, specifically can be item by item
Measurement can also measure simultaneously, and measuring principle includes but not limited to hot type principle, i.e., by detecting under identical heat shooting condition
The change of temperature field of sensor perimeter carries out physical measurement, and common methods have steady state method, transient hot wire technique, 3w methods etc..In addition,
When obtaining physical parameter using physical property sensor, in order to enable the physical parameter arrived is more accurate, calibrating gas can be used to object in advance
Property sensor is modified, specially：It is obtained with actual comparison by the physical parameter of physical property sensor measurement standard gas
Modifying factor is obtained, physical property sensor is modified according to modifying factor.
102 and according to the physical parameter measured, by the quantitative relationship between gas heating value and physical parameter calculate by
Survey the calorific value of gas；
The calorific value of gas is calculated according to the physical parameter that step 101 obtains for this step, specifically, gas in this step
Calorific value calculation method is as follows：Obtain physical parameter (such as thermal conductivity λ, thermal capacitance Cp, density p, viscosity, mu or the thermal diffusion for being tested gas
Factor alpha etc.) or physical property signal comprising physical property parameter information after, according between gas heating value and physical parameter (or physical property signal)
Quantitative relationship obtain the calorific value of tested gas.Above-mentioned quantitative relationship is described as：H=f (λ, Cp, ρ, μ, α ... ...), Ke Yigen
It pre-sets according to the experiment.
Specifically, the quantitative relationship between gas heating value and physical parameter (or physical property signal) can be obtained by following step
?：
Step 1：Determine calibrating gas.This step measures the air range being applicable according to gas heating value, determines several marks
Quasi- gas.Which calibrating gas is this step specifically provide, and is determined by preset suitable gas range, is generally tested by targeted
The possible fluctuation range of possible component and component of gas determines, specifically can find out gas heating value and object in the scope of application
Subject to quantitative relationship between property parameter.
In general, in order to obtain quantitative relationship between accurate imflammable gas calorific value and physical property, should include in principle
All one-component gases of imflammable gas, and/or, the typical imflammable gas of no less than three kinds usual ingredients ranges, tool
Body selection should meet country or the local regulation being grouped as about " imflammable gas " group with calorific value.
Step 2：To any standard gas, the calorific value of calibrating gas is obtained according to the calculation of the calibrating gas, or
It directly measures and obtains the calorific value (or other methods) of calibrating gas；And by measuring or inquiring databook (or other methods)
Obtain the corresponding physical parameter of the calibrating gas.
To any standard gas in this step, on the one hand it is grouped as according to the group of calibrating gas, is provided according to national standards
Different type gas heating value computational methods or measurement of caloric value method, obtain the calorific value of the calibrating gas；On the other hand, it obtains
Obtain the corresponding physical parameter of the calibrating gas, it is preferable that survey using the method (such as utilizing physical property sensor) in step 101
Measure the physical parameter of calibrating gas；The corresponding physical property ginseng of the calibrating gas can also be obtained by query-relevant data handbook
Number.The physical parameter measured herein can be such as thermal conductivity λ, thermal capacitance CP, density p, viscosity coefficient μ and thermal diffusion coefficient α
It is one or several in, it is however generally that, the selection physical parameter consistent with step 101.
Step 3：The calorific value of several calibrating gas obtained according to step 2 and corresponding physical parameter, use for example count
According to fitting or data regression etc. modes obtain the quantitative relationship between gas heating value and physical parameter.
The specific descriptions form of quantitative relationship includes but not limited in this step：Wherein, H is gas to H=p0+ ∑s pi × Xi
Calorific value, Xi be physical parameter function, Xi can be one or more of combination or physical parameter logarithm or refer to
Number or any of power function or multiple combinations, combination can be add, subtract, multiplication and division or power relationship, i are natural number,
P0, p1 ... ..., pn are corresponding quantitative relationship fitting coefficient.
Specifically, the quantitative relationship description form that this step specifically uses includes but not limited to following described：If physical property
Parameter selection uses thermal conductivity λ, thermal capacitance CP, density p and thermal diffusion coefficient α, and the quantitative relationship description form used can be H=p0
+p1×λ+p2×CP+p3×ρ+p4×α；If physical parameter selection uses thermal conductivity λ, density p and thermal capacitance CP, use to determine
Magnitude relation description form can be H=p0+p1 × λ+p2 × ρ × CP；If physical parameter selection uses thermal conductivity λ and thermal diffusion system
Number α, the quantitative relationship description form used can be H=p0+p1 × λ+p2 × α；If physical parameter selection using thermal conductivity λ,
Density p and thermal capacitance CP, the quantitative relationship description form used can be H=p0+p1 × λ+p2 × λ ^2+p3 × (ρ × CP)；If
Physical parameter uses thermal conductivity λ, density p and thermal capacitance CP, and the quantitative relationship description form used can be H=p0+p1 × λ/ln (λ)
+ p2 × (ρ × CP), wherein H is the calorific value of gas, and p0, p1, p2, p3, p4 are the fitting coefficient of corresponding quantitative relationship, are specifically taken
Value is determined by data fitting or regression analysis process.
103, according to calculated gas heating value and the gas flow measured, the energy for being tested gas is calculated.
This step calculates the energy for being tested gas, needs according to calculated gas heating value and the gas flow measured
It is corresponding with the gas flow measured to notice that calculated gas heating value is needed, namely makes to be directed to same fluid in step 101 as possible
Its flow and calorific value are obtained at the same sampling of synchronization simultaneously.
The present embodiment proposes a kind of gas energy metering method based on physical parameter Yu flow synchro measure, due to gas
Body flow and calorific value carry out real-time synchronization measurement, directly export energy meter information, can solve to reduce energy meter in the prior art
Due to terminal user's flow and measuring station calorific value information is asynchronous and the energy meter deviation brought in calculation.
Above-mentioned gas energy meter scheme is when it is implemented, be directed to the tested gas conveyed in the duct, flow and heat
Value may press own regular fluctuation at any time, so when calculating the energy for being tested gas in step 103, need to consider to calculate
Gas heating value it is whether corresponding with the gas flow measured, namely whether both for same fluid in the same sampling of synchronization
Place obtains its flow and calorific value simultaneously, it is however generally that need first to judge flow measurement and calorific value acquisition whether " fully synchronized ".Stream
Measurement and calorific value obtain whether " fully synchronized ", whether the sampling time synchronizes both when can be by judging to measure, if measurement
It is synchronous.If the sampling time synchronizes (the sampling time t0 of calorific value and the sampling time t0 ' of flow be synchronization) and measures week
Phase synchronizes (the measurement period △ t ' that the measurement period △ t of calorific value are equal to flow), while meeting above-mentioned two condition and being considered as " completely
It is synchronous ".
Therefore, with reference to shown in Fig. 2, above-mentioned measurement method provided in this embodiment further includes：201, judge that gas stream measures
Whether the sampling time is synchronous both when amount is measured with physical parameter；202, when the determination result is yes, then judge that gas stream measures
Whether the measurement period of amount and the measurement period that physical parameter measures are equal；Whether " completely to be obtained for flow measurement and calorific value
It is synchronous ", step 103 gas energy uses different computational methods, as follows：
The sampling time is synchronous both when if gas flow measurement is measured with physical parameter, and the gas flow measurement period with
Physical parameter measure measurement period it is equal (measurement of the two is fully synchronized), then the flow obtained gas flow measurement and according to
The multiplication of both calorific values that physical parameter obtains obtains the energy fluence e of gas, by carrying out integral and calculating to energy fluence e, i.e.,
Obtain the energy by gas in preset time.Specifically, the computational methods of gas energy are as follows：E=Q × H calculates the time
t0To tnThe energy inside flowed through is then as follows：
If fully synchronized, the high certainty of measurement of calorific value and flow, but power consumption compare it is larger, and to measurement of caloric value ring
Answer time requirement height.Due to various limitations, flow and calorific values such as the measuring principle of flow and calorific value, response time and power consumptions
Measurement period specific implementation when can not possibly be completely the same.
If (current art progress may be used since the sampling period synchronizes when flow and the not exclusively synchronous measurement of calorific value
Adjustment, thus herein not exclusively synchronize that refer mainly to measurement period asynchronous), then when calculating the energy of the tested gas：First
Judge which is higher value in the gas flow measurement period and physical parameter measurement measurement period；It calculates and is tested gas
When energy, with larger that of measurement period to divide benchmark, subsection integral calculating is carried out to the energy flowed through, is passed through
Tested gas energy.
In general, when the measurement of caloric value period is more than the flow measurement period, then with measurement period longer calorific value detection week
Phase is to divide benchmark, carries out subsection integral calculating to the energy flowed through, improves the precision of energy meter, then calculate time t0It arrives
tnThe energy inside flowed through is as follows：
In formula, HtnIt is tnThe measurement of caloric value value at moment.
It is whether synchronous for gas flow measurement and physical parameter measurement, using different computational methods, meter can be improved
Measure accuracy.
The above-mentioned measurement of caloric value period can be the fixed cycle, can also be according to the dynamic of calorific value variable condition adjust automatically
State period of change.The fixed cycle method, i.e. △ t=t1-t0=t2-t1=...=tn-tn-1, wherein t0、t1、…、tnFor
At the time of multiple measurement of caloric value corresponds to, is measured with a certain fixed measurement period and carry out sampled measurements calorific value, measurement period is not right
The hot-restriking die state of gas responds variation.Measurement of caloric value use fixed cycle method, according to measurement period it is larger,
Larger measurement deviation can be then introduced in the violent occasion of hot-restriking die；According to measurement period it is smaller, can be to a certain degree
Upper guarantee measuring accuracy, but also result in unnecessary power wastage.Therefore, it is necessary to introduce a kind of adaptive gas heating value wave
The calorific value and flow synchro measure scheme of dynamic state.
Specifically, being carried out by the measurement period of setting when physical parameter measures in above-mentioned measurement method, each physical property ginseng
After number measures, with reference to shown in Fig. 2, further include:The measurement period that the next physical parameter of following step setting measures is executed, specifically such as
Under：
Step S203, it calculates this and measures corresponding gas heating value；
Step S204, compare this and measure obtained gas heating value HtnThe gas heating value H obtained with last time measurementtn-1Whether
It is equal, that is, judge whether to meet Htn=Htn-1；If the gas heating value that this measurement obtains is equal to the gas that last time measurement obtains
Calorific value thens follow the steps S205, and otherwise (gas heating value that i.e. this measurement obtains is not equal to the air heat that last time measurement obtains
Value) execute step S205 '；
Step S205, by the value △ T of the measurement period of physical parameternIt is adjusted in existing value △ Tn-1On the basis of increase
Add one first preset time △ t, i.e. △ Tn=△ Tn-1+△t；
Step S206, judge the measurement period value △ T after this adjustmentnWhether preset upper limit value △ T are exceededH, you can with
Judge △ Tn≤△TH；
Step S207, if it is judged that for beyond (△ Tn>△TH), then by the measurement period △ T of physical parameternIt is set as
Preset upper limit value △ THEven △ Tn=△ TH；Otherwise the measurement period △ T that next physical parameter measuresnMaintain original value
It is constant, i.e. △ Tn=△ Tn-1+△t；
Step S208, the measurement of next physical parameter is carried out.
Step S205 ' if, this obtained gas heating value of measurement be not equal to the gas heating value that last time measurement obtains, physical property
The value Δ T of the measurement period of parameternIt is adjusted in existing value Δ Tn-1On the basis of reduce one second preset time Δ T, i.e. Δ
Tn=Δ Tn-1-ΔT；
Step S206 ', judge whether the measurement period value after this adjustment exceeds preset lower limit value (i.e. △ Tn≤△
TL), if it is judged that for beyond thening follow the steps S207 ' and the measurement period of physical parameter be set as the preset lower limit value, i.e.,
△Tn=△ TL；Otherwise the measurement period △ T that physical parameter measuresnMaintain original value constant, i.e. △ Tn=△ Tn-1-△T；So
Step S208 is executed afterwards.
Wherein, the first preset time △ t and the second preset time △ T are the integer in the intrinsic gauging period of physical parameter
Times.The measurement period of physical parameter is under existing setting, and physical parameter measures the interval between the sampling time twice.Physical parameter
The intrinsic gauging period be to complete physical parameter to measure the time needed, by measuring principle and measuring device/equipment itself
It determines.First preset time △ t and the second preset time △ T are period modulation step-length, and value can be constant, can also be
With the function of time correlation, with ensure for energy meter precision and low-power consumption dual requirements.
After next measurement of caloric value starts, above-mentioned calorific value periodic time self-adapting adjustable strategies are repeated, if front and back calorific value twice is surveyed
It is still identical to measure result, then system will continue to increase measurement period, reduce measurement of caloric value frequency, to reduce measurement power consumption；Instead
It, if front and back measurement of caloric value result twice is different, system can shorten rapidly measurement period, accelerate measurement of caloric value frequency, from
And reduce the deviation that hot-restriking die is brought.Under this kind of control program, the energy balane of gas still can be according to subsection integral calculating side
Method realizes, tested gas energy calculation when referring in particular to asynchronous measurement involved in being described above：The energy meter of gas
Calculation can still be realized according to subsection integral computational methods：
In formula, HtnIt is tnThe measurement of caloric value value at moment, at this time t0, t1, t2... ..., tnIt is system according to hot-restriking die situation
The measurement of caloric value period adaptively adjusted is defined.
It should also be noted that, the gas energy metering method of above-described embodiment, provides adaptive hot-restriking die state
Calorific value and flow synchro measure scheme, parameter (generally flow) on the basis of the parameter shorter by measurement period, with measurement period
Longer parameter is tracking parameter (generally calorific value), also that tracking parameter is synchronous with the sampling time of benchmark parameter, to ensure
Track parameter each measurement period the initial samples time it is consistent with the sampling time of a certain measurement period of basic parameter (so as to
Meet the synchro measure requirement in step 101 as possible).Specifically, the gas energy metering method of the present embodiment is sentenced in step 201
When disconnected result is no, above-mentioned measurement method further includes:Step 210, the sampling time for adjusting gas flow measurement or adjustment object
Property parameter measurement sampling time, so that the sampling time is synchronized.When it is implemented, this synchronize can be by existing synchronization
The Time Synchronizings such as clock are realized.
Above-mentioned measurement method, can be with profit in addition to increasing energy meter precision by above-mentioned self_adaptive adjusting scheme
The flow modificatory coefficient that different component gas is obtained with the physical parameter that physical measurement obtains is corrected gas flow output, is improved
Multicomponent gas flow measurement precision, it is final to improve energy meter result.
Specifically, as shown in figure 3, step 101 measurement is tested after the flow and physical parameter of gas, step 103 is counted
It calculates before being tested the energy of gas, the energy meter method of the present embodiment further includes：The physical parameter measured using step 101,
The initial signal or gas flow obtained to gas flow test is modified, and is surveyed revised gas flow as flow
The final result of amount.
Gas flow surveying instrument generally comprises volume type gas flow surveying instrument and quality formula gas flow measurement dress
Set, volume type gas flow surveying instrument detection be the tested gas flowed through in the unit interval volume, unit be cubic meter/
Second, and quality formula gas flow surveying instrument detection be the tested gas flowed through in the unit interval quality or standard reference body
Product, unit is usually cube meter per second under Kilograms Per Second or standard reference conditions, for different flow measurement devices using not
Same modification method.
Specifically, if using volume type gas flow surveying instrument, specific flow measurement and modification method are as follows：Profit
Obtain initial flow signal U with flow measurement devices such as ultrasonic wave, turbine or vortex streets, calculate or table look-up using peg model it is equal just
Formula obtains the initial flow Q ' of gas, and relational expression form is as follows：Q '=f (U), the flow Q ' are tested gas in operating condition
Volume flow under (a certain temperature T and a certain pressure P), it (such as can be standard to need further to correct to standard reference conditions
Operating mode, i.e. standard reference temperature T0=20 DEG C, standard reference pressure P0=101.325kPa), it needs to carry out if being related to component and changing
Compressibility of fluid amendment, specifically flow rate correction method is as follows：
It is tested using temperature sensor and pressure sensor synchro measure when measuring the flow and physical parameter that are tested gas
The temperature T and pressure P of gas.Then, it is calculated, the temperature T and pressure P of tested gas, is repaiied according to the physical parameter measured
Just to the flow modificatory coefficient K of standard reference conditions：K=(P/P0)×(T0/T)×(Z0/ Z), wherein gas under standard reference conditions
Body includes standard reference temperature and standard reference pressure；P is the pressure that pressure sensor measures, P0For standard reference pressure, T is
The gas temperature that temperature sensor measures, T0For standard reference temperature, Z0For the compressibility factor of gas under standard reference conditions, Z is
The compressibility factor of tested gas in the operating condition, Z0/ Z is provided according to national standards according to the physical parameter component information measured
Method, which calculates, to be obtained.Finally, the flow Q ' measured is modified according to the flow modificatory coefficient K of acquisition, revised flow Q
For：Q=KQ '=Q ' × (P/P0)×(T0/T)×(Z0/Z)。
If measuring the flow for being tested gas using thermal mass formula gas flow surveying instrument, measurement process is as follows：Example
Such as, real according to certain sampling period by thermal mass formula flow measurement device (such as thermal gas flowmeter or sensor)
When measure the flow of tested gas, the initial flow signal U of acquisition, calculate or table look-up using peg model etc. modes obtain by
Survey gas by flow Q ', relational expression form is as follows：
Q '=g (U),
Wherein, thermal mass formula gas flow surveying instrument can directly obtain tested gas under standard reference conditions
(such as standard condition, T0=20 DEG C, P0=101.325kPa) mass flow Q ', without carrying out repairing for temperature and pressure state
Just, but if being related to component and changing it needs to carry out component characteristic amendment, specific modification method is first to be directed to thermal mass formula gas stream
Measuring device obtains the flow modificatory coefficient for being tested gas, and flow modificatory coefficient is recycled to obtain gas flow test
Initial signal or gas flow are modified, wherein the acquisition process of the flow modificatory coefficient of tested gas is as follows：
The quantitative relationship between flow modificatory coefficient and physical parameter is first obtained, including：The gas being applicable according to measurement of caloric value
Body range provides several calibrating gas；To any standard gas and reference gas, obtained using gas flow standard device identical
Preset flow, then measured under the preset flow by thermal mass formula gas flow surveying instrument, obtain each standard
Gas and reference gas initial flow signal, while obtaining each calibrating gas and reference gas by measuring or inquiring databook
Corresponding physical parameter, the initial flow signal include the flow information of the calibrating gas and reference gas；Find out each mark
The flow modificatory coefficient of quasi- gas：K=U0/ U, K are the flow modificatory coefficient of calibrating gas, U and U0Respectively default same traffic
Under the calibrating gas and the reference gas initial flow signal；The flow of the calibrating gas obtained according to above-mentioned steps is repaiied
Positive coefficient and corresponding physical parameter obtain flow modificatory coefficient and physical property using modes such as data fitting or data regressions
Quantitative relationship between parameter；
Then, between the physical parameter and above-mentioned flow modificatory coefficient and physical parameter that are measured according to step 101
Quantitative relationship finds out the flow modificatory coefficient of tested gas.
Specifically, flow rate correction method is as follows：If the physical parameter obtained using physical property sensor calculates heat type flow quantity
The flow modificatory coefficient of meter is K, and flow is after amendment：
Q=Q ' × K, alternatively, Q=g (U × K ')
Specifically, K and K ' respectively represents the flow modificatory coefficient based on initial flow Q ' and flow rate voltage signal U, below
The preparation method and flow correction process of flow modificatory coefficient K or K ' are introduced according to specific example, it is as follows：
1) physical parameter and flow modificatory coefficient are obtained.Obtain reference gas (preferably air) respectively by physical property sensor
With the physical parameter of calibrating gas, such as thermal conductivity λ, thermal capacitance Cp, density p and thermal diffusion coefficient α and viscosity, mu；Pass through hot type stream
Gauge or sensor obtain the initial flow signal and initial flow of reference gas air and calibrating gas respectively.Pass through acquisition
The flow information obtains flow modificatory coefficient K or K ' value of each calibrating gas.Specifically, the flow correction of each calibrating gas
COEFFICIENT K or K ' preparation methods are as follows：
K=Q0/Q1Or K '=U0/U1
In formula, U0And U1The air that respectively thermal flowmeter measures under the same terms (standard reference conditions, same traffic)
It is exported with the initial flow signal of calibrating gas, Q0And Q1Respectively pass through under the same terms (standard reference conditions, same traffic)
The initial flow (flow before referred to correcting) for the air and calibrating gas that thermal flowmeter obtains.
2) quantitative relationship between physical parameter and flow modificatory coefficient is obtained.
The physical parameter and flow modificatory coefficient K and K ' obtained based on the above process, is fitted using regression fit or data
Method obtains the quantitative relationship between physical parameter and flow modificatory coefficient, specific as follows：
K '=f (λ, Cp, ρ, α, μ ... ...) or K=f ' (λ, Cp, ρ, α, μ ... ...),
In formula, λ is thermal conductivity, CPIt is density for thermal capacitance, ρ, α is thermal diffusion coefficient, and μ is viscosity, mu.It is above-mentioned to be based on Standard Gases
Body obtains calibration relationship, is used for thermal type flow measuring Information revision.
The present embodiment gas energy metering method is tested the measurement of gas physical parameter in step 101, as follows：Obtain object
Property parameter.The acquisition physical parameter, be specifically as follows obtain be tested the thermal conductivity λ of gas, thermal capacitance Cp, density p, viscosity, mu or
The combination of any of thermal diffusion coefficient α or multiple physical property.Specifically, pass through physical property sensor (preferably MEMS hot type
Physical property sensor) physical parameter of gas is tested according to certain sampling period detection, obtain above-mentioned physical parameter.What is obtained is upper
State on the one hand calorific value information that physical parameter calculates gas for step 102；On the other hand it is tested gas for obtaining different component
The flow modificatory coefficient of body corrects gas flowmeter output, multicomponent gas flow measurement precision is improved, to gas flow and heat
The carry out real-time synchronization measurement of value directly exports energy meter information, reduces the prior art due to terminal user's flow and metering
The deviation that calorific value information of standing is asynchronous and brings.
To sum up, the gas energy metering method of the integrated physical property and flow synchro measure that are proposed in this embodiment scheme, one
Aspect improves the precision of flow measurement, on the other hand realizes that the low cost of calorific value measures, instead of the height of existing calorimetry instrument
Cost input, can be special without being equipped with energy meter information that is inexpensive, providing such as natural gas imflammable gas in real time
The calorimetry instrument of door provides one kind reliably for the energy meter of resident or small business users imflammable gas and valuation
Property high, solution with high accuracy.Metering method provided in this embodiment, also by the calorific value of adaptive hot-restriking die situation with
Flow synchro measure scheme improves metering precision, reduces and measure power consumption to realize that flow is synchronous with calorific value information.
The embodiment of the present invention also provides a kind of gas energy metering device, and with reference to shown in Fig. 4, which includes：It measures
Unit 11, flow and physical parameter for measuring tested gas, when measurement, ensure that the flow of tested gas and physical parameter are
It is obtained in synchronization derived from same fluid；Calorific value calculation unit 12, for according to the physical parameter measured, passing through gas heating value
Quantitative relationship between physical parameter calculates the calorific value of tested gas；Energy calculation unit 13, for according to calculated
Gas heating value and the gas flow measured calculate the energy for being tested gas.
Wherein, measuring unit 11 includes：Flow measurement module 111 and physical property detection module 112.Sampling is set to be tested gas same
Shi Liujing flow measurements module 111 and physical property detection module 112, with ensure obtain tested gas flow and physical parameter be
It is obtained in synchronization derived from same fluid.Flow measurement module 111 includes but not limited to ultrasonic wave, turbine or vortex street, hot type
Equal gas flowmeters etc. or sensor, by flow measurement devices such as ultrasonic wave, turbine or vortex streets according to certain sampling period
Measure the flow for being tested gas in real time, obtain tested gas by flow.Physical property detection module 112 includes but not limited to object
Property sensor or the measuring device or system that physical parameter can be measured, wherein the physical parameter include thermal conductivity, it is thermal capacitance, close
One or more of degree, viscosity coefficient and thermal diffusion coefficient.Calorific value calculation unit 12 is calculated according to the physical parameter measured
The calorific value of tested gas, energy calculation unit 13 calculate tested according to calculated gas heating value and the gas flow measured
The energy of gas.
Gas energy metering device provided in this embodiment, improves the measurement method of calorific value, flow and heat may be implemented
The synchro measure of value improves the metering precision of device, while cost reduction.
Still optionally further, the measuring device further includes：Flow correction unit 14, for being joined using the physical property measured
Number, the initial signal or gas flow obtained to gas flow test is modified, using revised gas flow as stream
The final result of measurement.Optionally, it if measuring the flow for being tested gas using volume type gas flow surveying instrument, measures
Device further includes：Temperature sensor and pressure sensor (not shown), the flow for measuring tested gas and physical property ginseng
When number, synchro measure is tested the temperature and pressure of gas；Flow correction unit 14 includes：Correction factor acquisition module 141, is used for
It is calculated according to the physical parameter measured, the temperature and pressure of tested gas, obtains the flow correction corrected to standard reference conditions
Coefficient：K=(P/P0)×(T0/T)×(Z0/Z)；Correcting module 142 is used for the flow modificatory coefficient according to acquisition to gas stream
The initial signal or gas flow for measuring examination acquisition are modified；Wherein, K is flow modificatory coefficient, the standard reference item
Gas includes standard reference temperature and standard reference pressure under part；P is the pressure that pressure sensor measures, P0For standard reference pressure
By force, T is the gas temperature that temperature sensor measures, T0For standard reference temperature, Z0For gas under standard reference conditions compression because
Son, Z are the tested compressibility factor of gas in the operating condition, Z0/ Z is according to the physical parameter and component information measured according to country
Standard prescriptive procedure, which calculates, to be obtained.
Optionally, if measuring the stream for being tested gas in measuring unit 11 using thermal mass formula gas flow surveying instrument
Amount；The flow correction unit equally includes：Flow modificatory coefficient acquisition module 141 is directed to thermal mass formula gas for obtaining
Body flow measurement device obtains flow modificatory coefficient；Correcting module 142 is used for according to the flow modificatory coefficient to gas stream
The initial signal or gas flow for measuring examination acquisition are modified.But flow modificatory coefficient acquisition module 141 obtains flow
There is difference in the detailed process that correction factor obtains, need to use several calibrating gas.The calibrating gas is suitable according to measurement of caloric value
Air range determines
Specifically, the flow measurement module 111 in measuring unit 11 is thermal mass formula flow measurement device, it is additionally operable to
To under identical preset flow each calibrating gas and reference gas measure, obtain corresponding initial flow signal, it is described just
Beginning flow signal includes the flow information of calibrating gas, and preset flow can be obtained by special device such as gas flow standard device
?；Physical property detection module 112 in measuring unit 11 is additionally operable to obtain above-mentioned standard gas by measurement and reference gas corresponds to
Physical parameter, naturally it is also possible to by tabling look-up etc., modes obtain the corresponding physical parameter of above-mentioned standard gas；Flow correction system
Counting acquisition module 141 includes：Computational submodule, for according to the initial flow signal measured, finding out the flow of each calibrating gas
Correction factor：K=U0/ U, K are the flow modificatory coefficient of calibrating gas, U and U0The standard under respectively identical preset flow
The initial flow signal of gas and the reference gas；It is fitted submodule, for the flow correction system according to the calibrating gas
Number and corresponding physical parameter obtain flow modificatory coefficient and physical parameter by the way of data fitting or data regression
Between quantitative relationship；Computational submodule be additionally operable to according to the physical parameter that measures and flow modificatory coefficient and physical parameter it
Between quantitative relationship, find out the flow modificatory coefficient of tested gas.
Physical property detection module 112 measures the physical parameter obtained the on the one hand flow correction for obtaining different component gas
Coefficient corrects measurement of gas flow output, improves multicomponent gas flow measurement precision,；On the other hand for calculating gas
Calorific value information directly exports energy meter information, solution to make carry out real-time synchronization measurement of the realization to gas flow and calorific value
Since terminal user's flow is asynchronous with measuring station calorific value information, group can occur the prior art of having determined for the measurement point of flow and calorific value
Measurement deviation caused by partial wave is dynamic and gaseous state changes.
To improve measuring accuracy, it is preferable that above-mentioned metering device further includes realizing the logical block for measuring control, specific to wrap
It includes：Judging unit (not shown), whether the sampling time is synchronous when for judging that gas flow measurement is measured with physical parameter；
It is additionally operable to when the determination result is yes, then judges that the measurement period that the measurement period of gas flow measurement is measured with physical parameter is
It is no equal；If the sampling time is synchronous when gas flow measurement is measured with physical parameter, and gas flow measurement period and physical property
Parameter measurement measurement period is equal, then energy calculation unit specifically includes：First computing module, for according to calculated gas
Calorific value and the gas flow measured find out energy fluence, the second computing module, for by being accumulated to energy fluence
Point calculate, obtain in preset time by tested gas energy；If gas flow measurement and physical parameter sample when measuring
Time synchronization, but gas flow measurement period and physical parameter measurement measurement period are unequal, then and the energy calculation unit has
Body includes：Judgment module, for judging which is in the gas flow measurement period and physical parameter measurement measurement period
Higher value, computing module are right with larger that of measurement period to divide benchmark when energy for calculating tested gas
The energy that flows through carries out subsection integral calculating, obtain by tested gas energy.
Further, the measuring device further includes：Synchronous adjustment unit (not shown), for judging gas stream
When the sampling time is asynchronous when measurement and physical parameter measure, sampling time or the adjustment physical property of gas flow measurement are adjusted
The sampling time of parameter measurement makes the two sampling time synchronize, ensures that the calorific value measured is synchronous with flow, improves measuring accuracy.
Preferably, the physical property detection module is measured the physical parameter for being tested gas by the measurement period of setting, further includes：
Measurement period setting module, for after the measurement of each physical parameter, the measurement period measured next physical parameter to be set
It is fixed；The measurement period setting module includes：Comparison sub-module was surveyed for comparing the gas heating value that this measurement obtains with last time
The gas heating value measured；Submodule is set, the gas heating value for being obtained in this measurement is equal to the gas that last time measurement obtains
When body heat value, the value of the measurement period of physical parameter is adjusted to increase by one first preset time on the basis of existing value；
Otherwise, the value of the measurement period of the physical parameter is adjusted to reduce one second preset time on the basis of existing value；
The comparison sub-module is additionally operable to judge whether the measurement period value after this adjustment exceeds preset upper limit value；And this
Whether the measurement period value after adjustment exceeds preset lower limit value；The setting submodule is additionally operable to after judging this adjustment
When measurement period value exceeds preset upper limit value, the measurement period of the physical parameter is set as the preset upper limit value；Judging
When measurement period value after this adjustment exceeds preset lower limit value, the measurement period of the physical parameter is set as this and pre- is set
Limit value.If front and back measurement of caloric value result twice is different, system can shorten rapidly measurement period, accelerate measurement of caloric value frequency,
To reduce the deviation that hot-restriking die is brought, dual requirements of the user for energy meter precision and low-power consumption are ensure that.
In order to meet user's state with energy monitoring with statistics the needs of, it is also an option that property output gas calorific value, gas consumption,
The energy meters such as physical property and statistical information can help user to monitor the variation of imflammable gas calorific value and component；It provides simultaneously
Imflammable gas quality (calorific value) whithin a period of time and gas consumption dynamic changing curve, for gas supply side supply-demand mode, use
Gas prediction provides relevant basic data.Above-mentioned metering device may also include display module, except for showing energy balane mould
The calculated gas energy of block may also display other such as gas heating value, gas consumption, physical property energy meter and statistical informations,
The imflammable gas energy meter method and device based on physical property Yu flow synchro measure that the present embodiment provides a kind of,
According to the relationship between physical property and calorific value, and by adaptive hot-restriking die situation, to realize that flow is synchronous with calorific value information
Metering improves metering precision, reduces and measure power consumption.
It should be noted that under the premise of not conflicting, the technical characteristic in the embodiment of the present invention can make in any combination
With.
Each embodiment in this specification is described in a progressive manner, identical similar portion between each embodiment
Point just to refer each other, and each embodiment focuses on the differences from other embodiments.Especially for equipment reality
For applying example, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to embodiment of the method
Part explanation.
For the ease of clear explanation, the first, second equal printed words are used in the present invention, class discrimination are carried out to similar item,
First, second printed words do not limit the invention quantitatively, only to a kind of preferred mode for example, originally
Field technology personnel are according to the present disclosure, it is contemplated that obvious Variations similar or related expanding belong to this hair
In bright protection domain.
One of ordinary skill in the art will appreciate that realizing all or part of flow in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in a computer read/write memory medium
In, the program is when being executed, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, all answer by the change or replacement that can be readily occurred in
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (16)
1. a kind of gas energy metering method, which is characterized in that including：
The flow and physical parameter for being tested gas are measured, the flow of tested gas and physical parameter are derived from same fluid when measurement
And it is obtained in synchronization；
According to the physical parameter measured, the heat of tested gas is calculated by the quantitative relationship between gas heating value and physical parameter
Value；
According to calculated gas heating value and the gas flow measured, the energy for being tested gas is calculated；
Wherein, judge whether sampling time when gas flow measurement is measured with physical parameter is synchronous；When the determination result is yes,
Judge whether measurement period and the measurement period that physical parameter measures of gas flow measurement are equal again；
If it is judged that synchronized for the sampling time, and measurement period is equal, then when calculating the energy of the tested gas：First root
Energy fluence is found out according to the gas heating value and the gas flow that measure, then by carrying out integrating meter to energy fluence
Calculate, obtain in preset time by tested gas energy；
If the sampling time synchronizes, but measurement period is unequal, then when calculating the energy of the tested gas：First judge the gas
Which is higher value in body flow measurement period and physical parameter measurement measurement period；When calculating the energy for being tested gas, with
Larger that of measurement period carries out subsection integral calculating to divide benchmark, to the energy flowed through, obtain by tested gas
The energy of body.
2. metering method according to claim 1, which is characterized in that measure be tested gas flow and physical parameter it
Afterwards, it calculates before being tested the energy of gas and further includes：
Using the physical parameter measured, gas flow is modified.
3. metering method according to claim 2, which is characterized in that if surveyed using volume type gas flow surveying instrument
Amount is tested the flow of gas；It is described that gas flow is modified using the physical parameter measured, including：
When measuring the flow and physical parameter that are tested gas, temperature and pressure that synchro measure is tested gas are gone back；
According to the temperature and pressure of the physical parameter measured, tested gas, the flow correction corrected to standard reference conditions is obtained
Coefficient：K=(P/P0)×(T0/T)×(Z0/ Z), the standard reference conditions include standard reference temperature and standard reference pressure；
P0For standard reference pressure, T0For standard reference temperature, P is the gas pressure intensity measured, and T is the gas temperature measured, Z0For standard
The compressibility factor of gas under reference condition, Z are in working condition the compressibility factor of lower gas, Z0/ Z according to the physical parameter that measures and
Component information obtains；
The flow measured is modified according to the flow modificatory coefficient of acquisition.
4. metering method according to claim 2, which is characterized in that if filled using thermal mass formula gas flow measurement
Set the flow for measuring and being tested gas；It is described to utilize the physical parameter measured, gas flow is modified, specially：
For thermal mass formula gas flow surveying instrument, flow modificatory coefficient is obtained；
Gas flow is modified using the flow modificatory coefficient.
5. metering method according to claim 4, which is characterized in that it is directed to thermal mass formula gas flow surveying instrument,
Flow modificatory coefficient is obtained, including：
The air range being applicable according to measurement of caloric value provides several calibrating gas；
Reference gas is provided, and to any calibrating gas and the reference gas, uses the thermal mass formula gas stream
Measuring device obtains the initial flow signal under preset flow, while obtaining each calibrating gas and the reference gas pair
The physical parameter answered, the initial flow signal include flow information；
Find out the flow modificatory coefficient of each calibrating gas：K=U0/ U, K are the flow modificatory coefficient of calibrating gas, U and U0Respectively
The initial flow signal of the calibrating gas and the reference gas under preset flow；
According to the flow modificatory coefficient of each calibrating gas and the corresponding physical parameter, obtains flow modificatory coefficient and join with physical property
Quantitative relationship between number；
According to the quantitative relationship between the physical parameter and flow modificatory coefficient and physical parameter, the stream of tested gas is found out
Quantity correction coefficient.
6. metering method according to claim 1, which is characterized in that when judging that gas flow measurement and physical parameter measure
Sampling time when whether synchronizing, if it is judged that being no, then in measurement period and the physical property ginseng for judging gas flow measurement
Before whether several measurement periods measured are equal, further include：
The sampling time of gas flow measurement or the sampling time of adjustment physical parameter measurement are adjusted, keeps the two sampling time same
Step.
7. according to claim 1-5 any one of them metering methods, which is characterized in that by the survey of setting when physical parameter measures
Period progress is measured, further includes the measurement week for executing the next physical parameter measurement of following step setting after each physical parameter measures
Phase：
It calculates this and measures corresponding gas heating value；
Compare the gas heating value that the gas heating value that this measurement obtains is obtained with last time measurement；
If the gas heating value that this measurement obtains is equal to the gas heating value that last time measurement obtains, by the measurement week of physical parameter
The value of phase is adjusted to increase by the first preset time on the basis of existing value, and judges the measurement period value after this adjustment
Whether exceed preset upper limit value, if it is judged that for beyond, then the measurement period of physical parameter is set as the preset upper limit value,
If the gas heating value that this measurement obtains is not equal to the gas heating value that last time measurement obtains, by the measurement of physical parameter
The value in period is adjusted to reduce the second preset time on the basis of existing value, and judges that the measurement period after this adjustment takes
Whether value exceeds preset lower limit value, if it is judged that for beyond the measurement period of physical parameter is then set as the pre-determined lower limit
Value.
8. metering method according to claim 7, which is characterized in that first preset time and it is described second it is default when
Between be physical parameter the intrinsic gauging period integral multiple.
9. a kind of gas energy metering device, which is characterized in that including：
Measuring unit, flow and physical parameter for measuring tested gas, the flow and physical parameter of tested gas when measurement
It is derived from same fluid and is obtained in synchronization；
Calorific value calculation unit, for according to the physical parameter measured, passing through the quantitative relationship between gas heating value and physical parameter
Calculate the calorific value of tested gas；
Energy calculation unit, for according to calculated gas heating value and the gas flow measured, calculating the energy for being tested gas
Amount；
Whether judging unit, sampling time when for judging that gas flow measurement is measured with physical parameter are synchronous；It is additionally operable to
Judging result is when being, then judges whether the measurement period of gas flow measurement and the measurement period that physical parameter measures are equal；
If it is judged that synchronized for the sampling time, and measurement period is equal, then the energy calculation unit specifically includes：First
Computing module, for finding out energy fluence, the second computing module, for leading to according to the gas heating value and the gas flow
Cross and integral and calculating carried out to the energy fluence, obtain in preset time by tested gas energy；
If the sampling time synchronizes, but measurement period is unequal, then the energy calculation unit specifically includes：Judgment module is used
In judging that the gas flow measurement period and physical parameter measure in measurement period which is for higher value, computing module, use
When calculating the energy for being tested gas, with larger that of measurement period to divide benchmark, the energy flowed through is segmented
Integral and calculating, obtain by tested gas energy.
10. metering device according to claim 9, which is characterized in that the measuring unit includes：Flow measurement module and
Physical property detection module.
11. metering device according to claim 9 or 10, which is characterized in that further include：Flow correction unit, for profit
With the physical parameter measured, gas flow is modified.
12. metering device according to claim 11, which is characterized in that if using volume type gas flow surveying instrument
The flow for being tested gas is measured, the measuring device further includes：Temperature sensor and pressure sensor, for measuring tested gas
Flow and physical parameter when, synchro measure be tested gas temperature and pressure；The flow correction unit includes：
Correction factor acquisition module, temperature and pressure for gas to be calculated, be tested according to the physical parameter measured, is corrected
To the flow modificatory coefficient of standard reference conditions：K=(P/P0)×(T0/T)×(Z0/ Z), the standard reference conditions include mark
Quasi- reference temperature and standard reference pressure；P0For standard reference pressure, T0For standard reference temperature, P is the gas pressure intensity measured, T
For the gas temperature measured, Z0For the compressibility factor of gas under standard reference conditions, Z be in working condition the compression of lower gas because
Son, Z0/ Z is obtained according to the physical parameter and component information measured；
Correcting module, the initial signal for being obtained to gas flow test according to the flow modificatory coefficient of acquisition or gas
Body flow is modified.
13. metering device according to claim 11, which is characterized in that if using thermal mass formula gas flow measurement
Device measures the flow for being tested gas；The flow correction unit includes：
Flow modificatory coefficient acquisition module is directed to thermal mass formula gas flow surveying instrument for obtaining, obtains flow correction
Coefficient；
Correcting module, for being modified to gas flow according to the flow modificatory coefficient.
14. metering device according to claim 13, which is characterized in that
Flow measurement module in the measuring unit, be additionally operable to under preset flow each calibrating gas and reference gas carry out
It measures, obtains initial flow signal, the initial flow signal includes flow information, and the calibrating gas is according to measurement of caloric value institute
Applicable air range determines；Physical property detection module in the measuring unit is additionally operable to obtain the Standard Gases by measuring
Body and the corresponding physical parameter of reference gas；The flow modificatory coefficient acquisition module, including：
Computational submodule, for according to the initial flow signal measured, finding out the flow modificatory coefficient of each calibrating gas：K
=U0/ U, K are the flow modificatory coefficient of calibrating gas, U and U0The calibrating gas and the reference gas respectively under preset flow
The initial flow signal of body；
It is fitted submodule, is used for the flow modificatory coefficient according to the calibrating gas and corresponding physical parameter, flow is obtained and repaiies
Quantitative relationship between positive coefficient and physical parameter；
The computational submodule is additionally operable to determine according between the physical parameter and flow modificatory coefficient and physical parameter measured
Magnitude relation finds out the flow modificatory coefficient of tested gas.
15. metering device according to claim 10, which is characterized in that further include:
Synchronous adjustment unit, for when the sampling time is asynchronous when judging that gas flow measurement and physical parameter measure, adjusting
In the sampling time that the sampling time of gas flow measurement or adjustment physical parameter measure, the two sampling time is made to synchronize.
16. metering device according to claim 10, which is characterized in that the physical property detection module is all by the measurement of setting
Phase measures the physical parameter for being tested gas, further includes：Measurement period setting module is used for after the measurement of each physical parameter, right
The measurement period that next physical parameter measures is set；The measurement period setting module includes：
Comparison sub-module, the gas heating value obtained with last time measurement for comparing the gas heating value that this measurement obtains；
Submodule is set, when the gas heating value for being obtained in this measurement is equal to the gas heating value that last time measurement obtains, by object
The value of the measurement period of property parameter is adjusted to increase by the first preset time on the basis of existing value；Otherwise, by the physical property
The value of the measurement period of parameter is adjusted to reduce the second preset time on the basis of existing value；
The comparison sub-module is additionally operable to judge whether the measurement period value after this adjustment exceeds preset upper limit value；And
Whether the measurement period value after this adjustment exceeds preset lower limit value；
The setting submodule is additionally operable to when the measurement period value after judging this adjustment exceeds preset upper limit value, will be described
The measurement period of physical parameter is set as the preset upper limit value；Measurement period value after judging this adjustment exceeds pre-determined lower limit
When value, the measurement period of the physical parameter is set as the preset lower limit value.
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| JP6670706B2 (en) * | 2016-08-09 | 2020-03-25 | アズビル株式会社 | Apparatus and method for measuring calorific value |
| DE102016014151A1 (en) * | 2016-11-25 | 2018-05-30 | Diehl Metering Gmbh | Method for determining a calorific value and / or a Wobbe index of a gas mixture |
| FR3061302B1 (en) | 2016-12-28 | 2019-05-31 | Engie | METHOD FOR ESTIMATING A COMBUSTION CHARACTERISTIC OF A GAS CONTAINING DIHYDROGEN |
| CN110672185B (en) * | 2018-07-02 | 2024-04-16 | 中国石油化工股份有限公司 | Physical parameter calculation precision evaluation method of natural gas flow computer and application thereof |
| CN109164241A (en) * | 2018-09-29 | 2019-01-08 | 广州南控自动化设备有限公司 | A kind of combustion gas quality detection system and combustion gas quality detection method |
| CN112836178B (en) * | 2021-02-04 | 2022-05-13 | 成都秦川物联网科技股份有限公司 | Method and system for transmitting natural gas energy metering data |
| US11562182B2 (en) | 2021-02-04 | 2023-01-24 | Chengdu Qinchuan Iot Technology Co., Ltd. | Methods and systems for detecting detection devices located at energy metering points of natural gas |
| CN113155215B (en) * | 2021-04-28 | 2022-10-14 | 上海祎智量芯科技有限公司 | Metering output method and device of thermal gas flowmeter and storage medium |
| CN113156160B8 (en) * | 2021-04-28 | 2023-06-09 | 祎智量芯(江苏)电子科技有限公司 | Gas metering chip, metering method thereof and gas meter |
| US11979697B2 (en) | 2021-07-26 | 2024-05-07 | Chengdu Qinchuan Iot Technology Co., Ltd. | Methods and internet of things systems for obtaining natural gas energy metering component |
| CN113570475B (en) * | 2021-07-26 | 2023-10-27 | 成都秦川物联网科技股份有限公司 | Intelligent pipe network energy metering data cross-network sharing method and system |
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| EP0967483A2 (en) * | 1998-05-20 | 1999-12-29 | N.V. Nederlandse Gasunie | Method for noncombustively determining the calorific value of fuel gas |
| CN1238722C (en) * | 2003-11-14 | 2006-01-25 | 武汉钢铁(集团)公司 | Combustible gas calorific value on-line analysis method and detecting device thereof |
| US6977179B2 (en) * | 2004-03-19 | 2005-12-20 | Gas Technology Institute | Method and apparatus for measuring the heating value of a single or multi-component fuel gas |
| CN101571500A (en) * | 2008-04-30 | 2009-11-04 | 刘庆杰 | Method and device for light hydrocarbon gas calorific-value on-line analysis |
| CN102435581A (en) * | 2011-09-28 | 2012-05-02 | 中国计量学院 | Natural gas heat value calculation method based on natural gas component spectrum analysis |
| CN103175582B (en) * | 2011-12-21 | 2017-11-03 | 新奥科技发展有限公司 | Fluid metering method and apparatus |
| CN104197984B (en) * | 2014-08-21 | 2017-01-18 | 天信仪表集团有限公司 | Fuel gas energy metering method |
| CN104713606B (en) * | 2015-03-12 | 2018-11-30 | 新奥科技发展有限公司 | The flow-measuring method and device of multicomponent gas |
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