CN105277246A - Gas flow sampling method - Google Patents

Gas flow sampling method Download PDF

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Publication number
CN105277246A
CN105277246A CN201510615114.1A CN201510615114A CN105277246A CN 105277246 A CN105277246 A CN 105277246A CN 201510615114 A CN201510615114 A CN 201510615114A CN 105277246 A CN105277246 A CN 105277246A
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China
Prior art keywords
flow
judged result
correction
industrial pipeline
value
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CN201510615114.1A
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Chinese (zh)
Inventor
韩超
钱辉
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Group Corp
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Priority to CN201510615114.1A priority Critical patent/CN105277246A/en
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Abstract

The invention discloses a gas flow sampling method. A flow measurement value of an industrial pipeline acquired by a flow sensor is received; a pressure measurement value of the industrial pipeline acquired by a pressure sensor is received; a temperature measurement value of the industrial pipeline acquired by a temperature sensor is received; whether the pressure measurement value is equal to a preset pressure threshold is judged, and a first judgment result is acquired; whether the temperature measurement value is equal to a preset temperature threshold is judged, and a second judgment result is acquired; a correction formula matched with the first judgment result and the second judgment result is selected to correct the flow measurement value, and a flow correction value of the industrial pipeline is acquired. Measurement optimization is carried out on each measured gas medium, the technical problem that flow parameter measurement accuracy in the prior art is instable can be solved, measurement errors are reduced, and an accurate industrial pipeline inner flow is finally obtained continuously. Gas flow sampling reliability is ensured, and gas flow data acquisition accuracy is improved.

Description

A kind of gas flow method of sampling
Technical field
The present invention relates to industrial control system technical field, particularly relate to a kind of gas flow method of sampling.
Background technology
In modern industry control field, flow detection is the first reliability foundation of measuring control, trade settlement, has very strong practicality.And gas flow parameter is one of modal parameter in Detection & Controling, it is related to quality and the safety of production run.Generally have gas as nitrogen, argon gas, oxygen, coal gas etc. in the enterprise such as iron and steel, chemical industry field through conventional fluid media (medium), steam is as saturated vapour, superheated vapor, and liquid is as water, wet goods.
All operating mode flow in a lot of situation of the flow parameter obtained by flow sensor, instead of normal flow.When standard throttle apparatus is as identical with design temperature in the temperature only under operating mode such as orifice plate, nozzle, pressure is identical with design pressure, what record may be just volume or the mass rate of standard.But the fluid flow of same medium measured by same flow sensor, especially gas, even if measurement result is identical, owing to being subject to the impact of temperature and pressure, result is also often inconsistent.Therefore, prior art records the accuracy instability of flow parameter.
Summary of the invention
The embodiment of the present invention, by providing a kind of gas flow method of sampling, carries out measurement optimization, to solve the existing technical matters recording the accuracy instability of flow parameter to various tested gas medium.
A kind of gas flow method of sampling that the embodiment of the present invention provides, be applied in an industrial control system, one industrial pipeline is provided with flow sensor, on described industrial pipeline, the front and back of described flow sensor add pressure transducer and temperature sensor, and described method comprises: the flow measurements receiving the described industrial pipeline that described flow sensor collects; Receive the pressure measuring value of the described industrial pipeline that described pressure transducer collects; Receive the measured temperature of the described industrial pipeline that described temperature sensor collects; Judge whether described pressure measuring value equals preset pressure threshold value, obtain the first judged result; Judge whether described measured temperature equals preset temperature threshold value, obtain the second judged result; Select to revise described flow measurements with the correction formula that described first judged result and described second judged result are all mated, obtain the flow correction value of described industrial pipeline.
Preferably, the correction formula that described selection is all mated with described first judged result and described second judged result corrects described flow measurements, obtains the flow correction value of described industrial pipeline, specifically comprises:
When described first judged result and described second judged result are no, following first correction formula is selected to carry out temperature and pressure correction to described flow measurements:
F = P i + 101.325 P + 101.325 × T + 273.15 T i + 273.15 × F i
Wherein, F is flow correction value, F ifor flow measurements, P is preset pressure threshold value, P ifor pressure measuring value, T is preset temperature threshold value, T ifor measured temperature.
Preferably, the correction formula that described selection is all mated with described first judged result and described second judged result corrects described flow measurements, obtains the flow correction value of described industrial pipeline, specifically comprises:
Being no in described first judged result, when described second judged result is for being, selecting following second correction formula to carry out pressure correction to described flow measurements:
F = P i + 101.325 P + 101.325 × F i
Wherein, F is flow correction value, F ifor flow measurements, P is preset pressure threshold value, P ifor pressure measuring value.
Preferably, the correction formula that described selection is all mated with described first judged result and described second judged result corrects described flow measurements, obtains the flow correction value of described industrial pipeline, specifically comprises:
Be yes in described first judged result, when described second judged result is no, select following 3rd correction formula to carry out temperature adjustmemt to described flow measurements:
F = T + 273.15 T i + 273.15 × F i
Wherein, F is flow correction value, F ifor flow measurements, T is preset temperature threshold value, T ifor measured temperature.
Preferably, the correction formula that described selection is all mated with described first judged result and described second judged result corrects described flow measurements, obtains the flow correction value of described industrial pipeline, specifically comprises:
Described first judged result and described second judged result be time, select following 4th correction formula to calculate described flow measurements:
F＝F i
Wherein, F is flow correction value, and Fi is flow measurements.
The one or more technical schemes provided in the embodiment of the present invention, at least have following technique effect or advantage:
Before and after the pipeline that flow sensor carries out flow detection, install pressure transducer and temperature sensor due to have employed additional, the temperature signal of actual measurement and pressure signal are collected instrument monitoring equipment.Realize the collection of simulant signal to gas flow, gas temperature, gaseous tension, then carry out choice of parameters method based on the pressure measuring value of pressure transducer and temperature sensor collection and measured temperature to select suitable correction formula and revise flow measurements, carry out measuring optimizing to various tested gas medium thus, can the measuring error brought of modifying factor pressure, temperature variation, finally obtain flow in industrial pipeline accurately.Solve the existing technical matters recording the accuracy instability of flow parameter, ensure that the reliability that gas flow gathers, keep the accuracy that gas flow data gathers always.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the process flow diagram of the gas flow method of sampling in the embodiment of the present invention;
Fig. 2 is the programmed control schematic diagram selecting correction formula to carry out flow measurements correction in the embodiment of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Shown in figure 1, a kind of gas flow method of sampling that the embodiment of the present invention provides, be applied in an industrial control system, this industrial control system comprises flow sensor and instrument monitoring equipment.Flow sensor is arranged on the industrial pipeline that needs to carry out traffic monitoring, and instrument monitoring equipment is connected with this flow sensor.
In the technical scheme that the embodiment of the present invention provides, industrial pipeline is also provided with temperature sensor and pressure transducer.Temperature sensor and pressure transducer also with above-mentioned instrument monitoring equipment connection.Concrete, temperature sensor and the pressure transducer installation site on industrial pipeline is specifically positioned at the front and back of flow sensor, the concrete indication in front of flow sensor is the front along gas flow direction, and the rear indication of flow sensor is the rear along gas flow direction.
Concrete, industrial control system is specially: the industrial control system including PLC (ProgrammableLogicController, programmable logic controller (PLC)).
Below, shown in figure 1, the gas flow method of sampling that the embodiment of the present invention provides comprises the steps:
The flow measurements of the industrial pipeline that S101, reception flow sensor collect.
Concrete, due to flow sensor and an instrument monitoring equipment connection, the flow in flow sensor Real-time Collection industrial pipeline is in instrument monitoring equipment, thus industrial control system gets flow measurements from instrument monitoring equipment.
The pressure measuring value of the industrial pipeline that S102, reception pressure transducer collect.
Same, due to pressure transducer and an instrument monitoring equipment connection, the pressure in pressure transducer Real-time Collection industrial pipeline is in instrument monitoring equipment, thus industrial control system gets flow measurements from instrument monitoring equipment.
The measured temperature of the industrial pipeline that S103, reception temperature sensor collect.
Same, due to temperature sensor and an instrument monitoring equipment connection, the temperature in temperature sensor Real-time Collection industrial pipeline is in instrument monitoring equipment, thus industrial control system gets measured temperature from instrument monitoring equipment.
In specific implementation process, above-mentioned steps S101, S102, S103, for independently to perform step, do not limit the execution sequence of S101, S102, S103 herein.
Then, then S104 is performed after S101, S102, S103 all execute, or in S101, S102, S103 implementation, and perform S104 after obtain a flow measurements, a corresponding pressure measuring value, a corresponding measured temperature based on S101, S102, S103 at every turn.
S104, judge whether pressure measuring value equals preset pressure threshold value, obtain the first judged result.
S105, judge whether measured temperature equals preset temperature threshold value, obtain the second judged result.
Concrete, S104 and S105 can perform simultaneously, also can successively perform.Preset temperature threshold value and preset pressure threshold value are according to the actual production line place environment set of industrial pipeline, and such as, preset temperature threshold value can be the normal temperature laboratory at industrial pipeline place, and preset pressure threshold value can be atmospheric pressure.Certainly, for the industrial pipeline under other environments for use then according to the concrete numerical value of actual place environment determination preset temperature threshold value, preset pressure threshold value.
S106, selection are revised flow measurements with the correction formula that the first judged result and the second judged result are all mated, to obtain the flow correction value of industrial pipeline.
Specifically, Selecting parameter pin is had: " count_select " in the functional block of industrial control system, after now filtering out the correction formula revised flow measurements according to the first judged result and the second judged result, according to Selecting parameter pin: " count_select " carries out determining the selection result.
Concrete, for the first judged result, the second judged result, specifically there are following four kinds of different situations, often kind of corresponding a kind of correction formula that flow measurements is revised of situation:
Situation one: the first judged result and the second judged result are no, show that working condition pressure and industrial and mineral temperature all alter a great deal, then need to carry out temperature adjustmemt and pressure correction to flow measurements simultaneously.Concrete, select following first correction formula to carry out temperature and pressure correction to described flow measurements:
F = P i + 101.325 P + 101.325 × T + 273.15 T i + 273.15 × F i
In the first correction formula, F is flow correction value, F ifor flow measurements, P is preset pressure threshold value, P ifor pressure measuring value, T is preset temperature threshold value, T ifor measured temperature.
Situation two: the first judged result is no, and the second judged result is yes, show that working condition pressure alters a great deal, and industrial and mineral temperature variation is very little does not even change, then only need to carry out pressure correction to flow measurements, concrete, select following second correction formula to carry out pressure correction to flow measurements:
F = P i + 101.325 P + 101.325 × F i
In the first correction formula, F is flow correction value, F ifor flow measurements, P is preset pressure threshold value, P ifor pressure measuring value.
Situation three: the first judged result is yes, and the second judged result is no simultaneously, shows that working temperature alters a great deal, and the change of industrial and mineral pressure does not very littlely even change, then only need to carry out temperature adjustmemt, concrete, select following 3rd correction formula to carry out temperature adjustmemt to flow measurements:
F = T + 273.15 T i + 273.15 × F i
In the 3rd correction formula, F is flow correction value, F ifor flow measurements, T is preset temperature threshold value, T ifor measured temperature.
Situation four: the first judged result and the second judged result are and are, show that working condition pressure and industrial and mineral temperature all change very littlely even not change, then can not perform pressure correction and temperature adjustmemt to pressure measuring value, then select following 4th correction formula to calculate flow measurements:
F＝F i
In the 4th correction formula, F is flow correction value, and Fi is flow measurements.
Below, be illustrated with reference to the control method of step S106 in figure 2 pairs of embodiment of the present invention, definition: time " count_select=0 ", correspondence does not need to carry out correcting process, to in requisition for carrying out temperature adjustmemt process time " count_select=1 ", to in requisition for carrying out temperature, pressure correcting process time " count_select=2 ", to in requisition for carrying out pressure correction process time " count_select=3 ", but be not limited to the judgement execution sequence in Fig. 2:
S1061: judge whether Selecting parameter pin " count_select=0 ", if then perform S1062, otherwise performs S1063.
S1062: keep flow measurements constant.Be specially according to above-mentioned 4th correction formula: after F=Fi modified flow rate measured value, draw flow correction value.
S1063: judge whether Selecting parameter pin " count_select=1 ", if then perform S1064, otherwise performs S1065.
S1064: temperature adjustmemt is carried out to flow measurements.Be specially and draw flow correction value according to after above-mentioned 3rd correction formula modified flow rate measured value:
F = T + 273.15 T i + 273.15 × F i .
S1065: judge whether Selecting parameter pin " count_select=2 ", if then perform S1066, otherwise performs S1067.
S1066: temperature adjustmemt and pressure correction are carried out to flow measurements.Be specially and draw flow correction value according to after above-mentioned first correction formula modified flow rate measured value:
F = P i + 101.325 P + 101.325 × T + 273.15 T i + 273.15 × F i
S1067: judge whether Selecting parameter pin " count_select=3 ", if then perform S1068, otherwise terminates this flow process.
S1068: pressure correction is carried out to flow measurements.Concrete, draw flow correction value according to after above-mentioned second correction formula modified flow rate measured value:
F = P i + 101.325 P + 101.325 × F i .
By one or more embodiments that the invention described above provides, at least there is following technique effect or advantage:
Before and after the pipeline that flow sensor carries out flow detection, install pressure transducer and temperature sensor due to have employed additional, the temperature signal of actual measurement and pressure signal are collected instrument monitoring equipment.Realize the collection of simulant signal to gas flow, gas temperature, gaseous tension, then carry out choice of parameters method based on the pressure measuring value of pressure transducer and temperature sensor collection and measured temperature to select suitable correction formula and revise flow measurements, carry out measuring optimizing to various tested gas medium thus, can the measuring error brought of modifying factor pressure, temperature variation, finally obtain flow in industrial pipeline accurately.Solve the existing technical matters recording the accuracy instability of flow parameter, ensure that the reliability that gas flow gathers, keep the accuracy that gas flow data gathers always.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (5)

1. a gas flow method of sampling, be applied in an industrial control system, it is characterized in that, an industrial pipeline is provided with flow sensor, on described industrial pipeline, the front and back of described flow sensor add pressure transducer and temperature sensor, and described method comprises:
Receive the flow measurements of the described industrial pipeline that described flow sensor collects;
Receive the pressure measuring value of the described industrial pipeline that described pressure transducer collects;
Receive the measured temperature of the described industrial pipeline that described temperature sensor collects;
Judge whether described pressure measuring value equals preset pressure threshold value, obtain the first judged result;
Judge whether described measured temperature equals preset temperature threshold value, obtain the second judged result;
Select to revise described flow measurements with the correction formula that described first judged result and described second judged result are all mated, obtain the flow correction value of described industrial pipeline.
2. the gas flow method of sampling as claimed in claim 1, it is characterized in that, the correction formula that described selection is all mated with described first judged result and described second judged result corrects described flow measurements, obtains the flow correction value of described industrial pipeline, specifically comprises:
When described first judged result and described second judged result are no, following first correction formula is selected to carry out temperature and pressure correction to described flow measurements:
F = P i + 101.325 P + 101.325 × T + 273.15 T i + 273.15 × F i
Wherein, F is flow correction value, F ifor flow measurements, P is preset pressure threshold value, P ifor pressure measuring value, T is preset temperature threshold value, T ifor measured temperature.
3. the gas flow method of sampling as claimed in claim 1, it is characterized in that, the correction formula that described selection is all mated with described first judged result and described second judged result corrects described flow measurements, obtains the flow correction value of described industrial pipeline, specifically comprises:
Being no in described first judged result, when described second judged result is for being, selecting following second correction formula to carry out pressure correction to described flow measurements:
F = P i + 101.325 P + 101.325 × F i
Wherein, F is flow correction value, F ifor flow measurements, P is preset pressure threshold value, P ifor pressure measuring value.
4. the gas flow method of sampling as claimed in claim 1, it is characterized in that, the correction formula that described selection is all mated with described first judged result and described second judged result corrects described flow measurements, obtains the flow correction value of described industrial pipeline, specifically comprises:
Be yes in described first judged result, when described second judged result is no, select following 3rd correction formula to carry out temperature adjustmemt to described flow measurements:
F = T + 273.15 T i + 273.15 × F i
Wherein, F is flow correction value, F ifor flow measurements, T is preset temperature threshold value, T ifor measured temperature.
5. the gas flow method of sampling as claimed in claim 1, it is characterized in that, the correction formula that described selection is all mated with described first judged result and described second judged result corrects described flow measurements, obtains the flow correction value of described industrial pipeline, specifically comprises:
Described first judged result and described second judged result be time, select following 4th correction formula to calculate described flow measurements:
F＝F i
Wherein, F is flow correction value, and Fi is flow measurements.
CN201510615114.1A 2015-09-24 2015-09-24 Gas flow sampling method Pending CN105277246A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5975126A (en) * 1996-10-04 1999-11-02 Emerson Electric Co. Method and apparatus for detecting and controlling mass flow
CN201583301U (en) * 2010-01-19 2010-09-15 康逸 Electronic temperature-pressure compensation film type gas meter
CN104459197A (en) * 2014-12-15 2015-03-25 中煤科工集团重庆研究院有限公司 Method and system for lowering site pipeline gas flow rate measurement lower limit
CN104501894A (en) * 2014-12-19 2015-04-08 重庆拓展自动化仪表有限公司 Accurate steam flow metering compensating method
CN104764504A (en) * 2015-01-28 2015-07-08 鞍钢集团工程技术有限公司 Flow augmenting method of saturated and superheated steam

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5975126A (en) * 1996-10-04 1999-11-02 Emerson Electric Co. Method and apparatus for detecting and controlling mass flow
CN201583301U (en) * 2010-01-19 2010-09-15 康逸 Electronic temperature-pressure compensation film type gas meter
CN104459197A (en) * 2014-12-15 2015-03-25 中煤科工集团重庆研究院有限公司 Method and system for lowering site pipeline gas flow rate measurement lower limit
CN104501894A (en) * 2014-12-19 2015-04-08 重庆拓展自动化仪表有限公司 Accurate steam flow metering compensating method
CN104764504A (en) * 2015-01-28 2015-07-08 鞍钢集团工程技术有限公司 Flow augmenting method of saturated and superheated steam

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
任玉峰: ""差压式流量传感器测量一般气体流量时的温度压力补偿方法"", 《工业仪表与自动化装置》 *

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Effective date of registration: 20170718

Address after: 430080 Qingshan District stock company of Hubei, Wuhan Province

Applicant after: Wuhan iron and Steel Company Limited

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Application publication date: 20160127