CN114279888A - Pipeline gas content measuring method and device, storage medium and electronic equipment - Google Patents
Pipeline gas content measuring method and device, storage medium and electronic equipment Download PDFInfo
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Abstract
The invention discloses a method and a device for measuring the gas content in a pipeline, a storage medium and electronic equipment, wherein if a fan or a compressor runs in a frequency conversion mode, a second measured value of a measuring instrument for collecting the gas pressure in the pipeline and a third measured value of the measuring instrument for collecting the gas temperature in the pipeline are respectively obtained, and a first gas density is obtained through calculation; when the target interval is reached, respectively acquiring the data, a first measurement value of a measurement instrument for acquiring gas differential pressure and/or flow in a pipeline and a fourth measurement value of a measurement instrument for acquiring the rotating speed of a fan or a compressor, and calculating a second gas density and the density of the rare gas to be measured; and measuring the content of the rare gas in the pipeline according to the density of the first gas, the density of the second gas and the density of the rare gas to be measured. The method completes measurement under the condition of not adding other detection instruments, and the measurement method is simple; the measuring instrument has quick response, convenient maintenance and low cost.
Description
Technical Field
The invention relates to the technical field of gas measurement, in particular to a method and a device for measuring the gas content in a pipeline, a storage medium and electronic equipment.
Background
The air is mixed with helium to change the aerodynamic characteristics of the air, so the content of the helium in the air needs to be measured. The current methods for detecting the helium content in the air mainly comprise gas chromatography, mass spectrometry and the like. The helium content measurement by gas chromatography and mass spectrometry has the characteristics of high precision and good sensitivity, but the detection equipment needs to be independently arranged, the response is slow, and the maintenance cost is high in the use process.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, an apparatus, a storage medium, and an electronic device for measuring a gas content in a pipeline, so as to solve the technical problems in the prior art that a detection device is slow in response and high in maintenance cost during use.
The technical scheme provided by the invention is as follows:
the first aspect of the embodiments of the present invention provides a method for measuring the gas content in a pipeline, in which a measuring instrument for measuring gas parameters is arranged in the pipeline, the measuring instrument is connected to a fan or a compressor in the pipeline, and the initial state of the gas filling in the pipeline during the operation of gas-using equipment is air that does not contain rare gas to be measured; the pipeline gas content measuring method comprises the following steps: if the fan or the compressor runs, respectively acquiring a second measurement value of a measuring instrument for acquiring gas pressure in the pipeline and a third measurement value of the measuring instrument for acquiring gas temperature in the pipeline; calculating a first gas density from the second and third measurements; when the target interval is reached, respectively acquiring a first measurement value of a measuring instrument for acquiring gas differential pressure and/or flow in a pipeline, a second measurement value of the measuring instrument for acquiring gas pressure in the pipeline, a third measurement value of the measuring instrument for acquiring gas temperature in the pipeline and a fourth measurement value of the measuring instrument for acquiring the rotating speed of a fan or a compressor; when the measuring instrument used for acquiring the first measured value comprises a gas differential pressure measuring instrument and a flow measuring instrument, calculating a second gas density according to a gas differential pressure value acquired by the gas differential pressure measuring instrument and a flow value acquired by the flow measuring instrument; when the measuring instrument used for collecting the first measured value comprises a gas differential pressure measuring instrument or a flow measuring instrument, determining a proportional parameter according to the first measured value and the fourth measured value and calculating a second gas density according to the first measured value, the fourth measured value and the proportional parameter; determining the density of the rare gas to be measured mixed in the current pipeline according to the second measurement value and the third measurement value; and measuring the content of the rare gas in the pipeline according to the first gas density, the second gas density and the density of the rare gas to be measured.
Optionally, the measurement instruments used for collecting the first measurement value include a differential gas pressure measurement instrument and a flow measurement instrument, and the method further includes: if the fan or the compressor runs, respectively acquiring a gas differential pressure value acquired by the gas differential pressure measuring instrument and a flow value acquired by the flow measuring instrument; and calculating the first gas density according to the gas differential pressure value and the flow value.
Optionally, before the obtaining a second measurement value of the measuring instrument for collecting the gas pressure in the pipeline and a third measurement value of the measuring instrument for collecting the gas temperature in the pipeline respectively when the fan or the compressor is running, the method further includes: vacuumizing the pipeline and filling air which does not contain rare gas to be measured in the pipeline; the line filled with air not containing the rare gas to be measured is subjected to a continuous purge treatment.
Optionally, said calculating a first gas density from said differential gas pressure value and said flow value comprises: calculating a first gas density according to the gas differential pressure value and the flow value according to the following formula:
in the formula,. DELTA.p0Representing a first measured value, q, of the differential pressure measuring device in an initial statev0A first measurement value representing the flow meter in an initial state; a represents the obtainable constant:
wherein C represents the outflow coefficient of the flow measuring instrument, and is dimensionless; beta represents the diameter ratio and is dimensionless; epsilon represents the expansion coefficient and has no dimension; d represents the primary device orifice or throat diameter.
Optionally, if the blower or the compressor operates at a variable frequency, and the measuring instrument for acquiring the first measurement value includes a gas differential pressure measuring instrument or a flow measuring instrument, determining a proportional parameter according to the first measurement value and the fourth measurement value, and calculating a second gas density according to the first measurement value, the fourth measurement value, and the proportional parameter, includes: when the measuring instrument is a differential pressure measuring instrument, the second gas density is calculated according to the following formula:
wherein Δ p represents a first measurement value of the differential pressure measuring instrument measured after a target interval duration; c2Representing the scale parameter; n represents the fourth measurement value;
when the measuring instrument is a flow measuring instrument, the second gas density is calculated according to the following formula:
in the formula, qvA first measurement value representing a measurement of the flow meter after a target interval duration; c1Representing the scale parameter; n represents the fourth measurement value.
Optionally, if the fan or the compressor operates at a variable frequency and a fixed frequency, the measuring instrument which operates at the variable frequency and the fixed frequency and is used for acquiring the first measured value is a gas differential pressure measuring instrument, and the second gas density is calculated according to the following formula:
wherein Δ p represents a first measurement value of the differential pressure measuring instrument measured after a target interval duration;
when the measuring instrument used for acquiring the first measurement value is a flow measuring instrument, the second gas density is calculated according to the following formula:
in the formula, qvRepresents a first measured value of the flow meter measured after a target interval duration.
Optionally, the measuring the content of the rare gas in the pipeline according to the first gas density, the second gas density and the rare gas density to be measured comprises: calculating the content of the rare gas in the pipeline according to the first gas density, the second gas density and the density of the rare gas to be measured by the following formula:
in the formula, ρ1Representing the first gas density; rho2Representing the second gas density; rho4Representing the rare gas density to be measured.
A second aspect of the embodiments of the present invention provides a gas content measuring device for a pipeline, in which a measuring instrument for measuring gas parameters is disposed in the pipeline, the measuring instrument is connected to a fan or a compressor in the pipeline, and the initial state of the gas filling in the pipeline during the operation of the gas consuming apparatus is air that does not contain rare gas to be measured; this pipeline gas content measurement device includes: the first acquisition module is used for respectively acquiring a second measurement value of a measuring instrument for acquiring gas pressure in the pipeline and a third measurement value of the measuring instrument for acquiring gas temperature in the pipeline if the fan or the compressor runs; the first calculation module is used for calculating a first gas density according to the second measurement value and the third measurement value; the second acquisition module is used for respectively acquiring a first measurement value of a measuring instrument for acquiring gas differential pressure and/or flow in the pipeline, a second measurement value of the measuring instrument for acquiring gas pressure in the pipeline, a third measurement value of the measuring instrument for acquiring gas temperature in the pipeline and a fourth measurement value of the measuring instrument for acquiring the rotating speed of the fan or the compressor when the target interval is reached; the second calculation module is used for calculating a second gas density according to the gas differential pressure value acquired by the gas differential pressure measurement instrument and the flow value acquired by the flow measurement instrument when the measurement instrument for acquiring the first measurement value comprises the gas differential pressure measurement instrument and the flow measurement instrument; the third calculation module is used for determining a proportional parameter according to the first measurement value and the fourth measurement value and calculating a second gas density according to the first measurement value, the fourth measurement value and the proportional parameter when the measuring instrument used for acquiring the first measurement value comprises a gas differential pressure measuring instrument or a flow measuring instrument; the fourth calculation module is used for determining the density of the rare gas to be measured mixed in the current pipeline according to the second measurement value and the third measurement value; and the measuring module is used for measuring the content of the rare gas in the pipeline according to the first gas density, the second gas density and the density of the rare gas to be measured.
A third aspect of embodiments of the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to perform a pipeline gas content measurement method according to any one of the first aspect and the first aspect of embodiments of the present invention.
A fourth aspect of an embodiment of the present invention provides an electronic device, including: the gas content measuring method comprises a memory and a processor, wherein the memory and the processor are connected in communication with each other, the memory stores computer instructions, and the processor executes the computer instructions so as to execute the pipeline gas content measuring method according to any one of the first aspect and the first aspect of the embodiment of the invention.
The technical scheme provided by the invention has the following effects:
the pipeline gas content measuring method provided by the embodiment of the invention is characterized in that a measuring instrument for measuring gas parameters is arranged in a pipeline, the measuring instrument is connected with a fan or a compressor in the pipeline, and the filling gas in the pipeline does not contain the air of the rare gas to be measured in the initial state of the operation of gas-using equipment; the method comprises the following steps: if the fan or the compressor runs, respectively acquiring a second measurement value of a measuring instrument for acquiring gas pressure in the pipeline and a third measurement value of the measuring instrument for acquiring gas temperature in the pipeline; calculating a first gas density from the second and third measurements; when the target interval is reached, respectively acquiring a first measurement value of a measuring instrument for acquiring gas differential pressure and/or flow in a pipeline, a second measurement value of the measuring instrument for acquiring gas pressure in the pipeline, a third measurement value of the measuring instrument for acquiring gas temperature in the pipeline and a fourth measurement value of the measuring instrument for acquiring the rotating speed of a fan or a compressor; when the measuring instrument used for acquiring the first measured value comprises a gas differential pressure measuring instrument and a flow measuring instrument, calculating a second gas density according to a gas differential pressure value acquired by the gas differential pressure measuring instrument and a flow value acquired by the flow measuring instrument; when the measuring instrument used for collecting the first measured value comprises a gas differential pressure measuring instrument or a flow measuring instrument, determining a proportional parameter according to the first measured value and the fourth measured value and calculating a second gas density according to the first measured value, the fourth measured value and the proportional parameter; determining the density of the rare gas to be measured mixed in the current pipeline according to the second measurement value and the third measurement value; and measuring the content of the rare gas in the pipeline according to the first gas density, the second gas density and the density of the rare gas to be measured. The method can complete the measurement of the content of the rare gas in the air flow under the condition of not adding other detection instruments, and the measurement method is simple; the differential pressure and/or flow measuring instrument has the advantages of quick response, convenient maintenance and low cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a block diagram of a method for measuring gas content in a pipeline according to an embodiment of the invention;
FIG. 2 is a flow chart of a method of pipeline gas content measurement according to an embodiment of the invention;
FIG. 3 is a block diagram of a pipeline gas content measuring device according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a computer-readable storage medium provided according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a method for measuring the gas content in a pipeline, wherein a measuring instrument for measuring gas parameters is arranged in the pipeline, the measuring instrument is connected with a fan or a compressor in the pipeline, the initial state of the gas filling in the pipeline during the operation of gas equipment is air without rare gas to be measured, and as shown in figure 1, 1 represents the compressor or the fan; 2 denotes a gas-using equipment; 3 denotes a regulating valve; 4 denotes a differential pressure measuring instrument or a flow measuring instrument; 5 represents PLC or DCS; CP represents a differential pressure or flow signal; p represents a gas pressure signal; t represents a gas temperature signal; n represents a rotational speed signal of the compressor or fan. In the embodiment of the present application, helium is taken as an example of the rare gas to be measured; as shown in fig. 2, the method comprises the steps of:
step S101: and if the fan or the compressor runs, respectively acquiring a second measured value of the measuring instrument for acquiring the gas pressure in the pipeline and a third measured value of the measuring instrument for acquiring the gas temperature in the pipeline. Specifically, initial parameters, including the pressure p (mpa) of the gas in the pipeline, i.e., the second measurement value, and the temperature T (c) of the gas in the pipeline, i.e., the third measurement value, need to be acquired first before starting the measurement.
Step S102: and calculating the first gas density according to the second measurement value and the third measurement value. Specifically, the first gas density is calculated according to the following formula according to the second measurement value and the third measurement value:
wherein P represents a gas pressure value in the pipeline, i.e. a second measured value; t represents the gas temperature T in the line, i.e. the third measured value.
Step S103: when the target interval is reached, a first measured value of a measuring instrument used for collecting gas differential pressure and/or flow in the pipeline, a second measured value of the measuring instrument used for collecting gas pressure in the pipeline, a third measured value of the measuring instrument used for collecting gas temperature in the pipeline and a fourth measured value of the measuring instrument used for collecting the rotating speed of the fan or the compressor are respectively obtained. Specifically, after the target interval duration is reached, the parameters including the differential pressure Δ p (pa) or the flow rate q of the differential pressure measuring instrument are repeatedly acquiredv(m3H), the pressure P (MPa) of the gas in the pipeline, the temperature T (DEG C) of the gas in the pipeline, and the rotating speed n (r/min) of a fan or a compressor. The target interval duration is not limited in the embodiment of the present application, and a person skilled in the art may determine the target interval duration by the interval duration when the helium gas is mixed in the pipeline system according to the actual situation.
Step S104: and when the measuring instrument used for acquiring the first measured value comprises a gas differential pressure measuring instrument and a flow measuring instrument, calculating a second gas density according to the gas differential pressure value acquired by the gas differential pressure measuring instrument and the flow value acquired by the flow measuring instrument. Specifically, when the measuring instrument for acquiring the first measurement value includes a gas differential pressure measuring instrument and a flow measuring instrument, the second gas density is directly calculated according to the measured differential pressure value and flow value according to the following formula:
specifically, a represents an attainable constant:
wherein C represents the outflow coefficient of the flow measuring instrument and is dimensionless; beta represents the diameter ratio and is dimensionless; epsilon represents the expansion coefficient and has no dimension; d represents the primary device orifice or throat diameter; Δ p represents a differential pressure value Δ p (pa); q. q.svRepresenting the flow rate value qv(m3/h)。
Step S105: when the measuring device for taking the first measured value comprises a differential gas pressure measuring device or a flow measuring deviceAnd the quantity measuring instrument determines a proportional parameter according to the first measuring value and the fourth measuring value and calculates a second gas density according to the first measuring value, the fourth measuring value and the proportional parameter. Specifically, when the measuring instrument for acquiring the first measurement value is one of a differential pressure measuring instrument and a flow measuring instrument, the second gas density cannot be calculated according to the acquired differential pressure value and flow value, and at this time, a proportional parameter of the first measurement value and a fourth measurement value, including differential pressure Δ p (pa) or flow q, is first determinedv(m3H) coefficient of proportionality C to the rotational speed n (r/min) of the fan or compressor1Or C2。
Specifically, a plurality of rotating speed points N are uniformly selected in the full rotating speed range (0-N, N is the maximum rotating speed of the compressor or the fan) of the compressor or the fan1,n2… …, N, while the differential pressure value Δ p for each speed is recorded in table 11,Δp2,……,ΔpnOr the corresponding flow value qv1,qv2,……,qvn：
TABLE 1
| Speed n (r/min) | Differential pressure Δ p/(Pa) | Flow rate qv(m3/h) |
| n1 | Δp1 | qv1 |
| n2 | Δp2 | qv2 |
| …… | …… | …… |
| N | Δpn | qvn |
Then, according to a similar principle of fluid mechanics:
Δp＝C2n2…………………………………(3)
qv＝C1n…………………………………(4)
the least square method is adopted to fit the data collected in the table 1 to obtain the corresponding proportionality coefficient C1Or C2。
A second gas density may then be calculated based on the first, fourth, and ratio parameters.
Step S106: and determining the density of the rare gas to be measured mixed in the current pipeline according to the second measurement value and the third measurement value. Specifically, the rare gas density to be measured is calculated as follows:
wherein P represents a second measurement; t represents a third measurement value.
Step S107: and measuring the content of the rare gas in the pipeline according to the first gas density, the second gas density and the density of the rare gas to be measured.
The pipeline gas content measuring method provided by the embodiment of the invention can complete the measurement of the content of the rare gas in the air flow under the condition of not adding other detecting instruments, and the measuring method is simple; the differential pressure and/or flow measuring instrument has the advantages of quick response, convenient maintenance and low cost.
As an optional implementation manner of the embodiment of the present invention, when the measurement instruments for acquiring the first measurement value include a differential gas pressure measurement instrument and a flow measurement instrument, the method further includes: if the fan or the compressor runs, respectively acquiring a gas differential pressure value acquired by the gas differential pressure measuring instrument and a flow value acquired by the flow measuring instrument; and calculating the first gas density according to the gas differential pressure value and the flow value. Specifically, when the fan or the compressor is operated, the first gas density may also be calculated from the gas differential pressure value and the flow rate value. Firstly, a gas differential pressure value and a flow value are obtained according to measurement of a measuring instrument, and then calculation is carried out according to the following formula:
in the formula,. DELTA.p0Representing a first measured value, q, of the differential pressure measuring device in an initial statev0A first measurement value representing the flow meter in an initial state; a represents the obtainable constant:
wherein C represents the outflow coefficient of the flow measuring instrument, and is dimensionless; beta represents the diameter ratio and is dimensionless; epsilon represents the expansion coefficient and has no dimension; d represents the primary device orifice or throat diameter.
As an optional implementation manner of the embodiment of the present invention, before step S101, in order to determine that the filling gas in the pipeline is air containing no rare gas to be measured in an initial state of the gas-using equipment operation, the method further includes: vacuumizing the pipeline and filling air which does not contain rare gas to be measured in the pipeline; the line filled with air not containing the rare gas to be measured is subjected to a continuous purge treatment.
Specifically, firstly, the pipeline is vacuumized once, and air which does not contain the rare gas to be measured is filled in the pipeline, wherein the final pressure of vacuumization should meet the following requirements:
pvacuum≤0.02pForehead (forehead)
In the formula, pVacuumRepresents the final pressure of the vacuum pumping of the pipeline; p is a radical ofForehead (forehead)The rated operation pressure of the pipeline is represented when the gas-using equipment is operated;
the line air is then continuously purged with air that is preset to contain no noble gas to be measured. Wherein, the continuous purging time is required to satisfy the following conditions:
wherein t represents a continuous purge time; v represents the line volume; q. q.sv purgeRepresents the purge flow (m)3/h)。
As an optional implementation manner of the embodiment of the present invention, if the blower or the compressor operates at a variable frequency, and the measuring instrument for acquiring the first measurement value includes a differential gas pressure measuring instrument or a flow measuring instrument, determining a proportional parameter according to the first measurement value and the fourth measurement value, and calculating the second gas density according to the first measurement value, the fourth measurement value, and the proportional parameter, includes: when the measuring instrument is a differential pressure measuring instrument, the second gas density is calculated according to the following formula:
wherein Δ p represents a first measurement value of the differential pressure measuring instrument measured after a target interval duration; c2Representing the scale parameter; n represents the fourth measurement value;
in particular, when the fan or the compressor runs in a variable frequency mode and the measuring instrument is a differential pressure measuring instrument,volumetric flow q of gas in the pipelinev＝C1n, substituting the flow rate into formula (5) can obtain:
also according to equation (2), one can obtain:
from equations (7) and (8), it can be found that when the measuring instrument is a differential pressure measuring instrument, the second gas density is:
when the measuring instrument is a flow measuring instrument, the second gas density is calculated according to the following formula:
in the formula, qvA first measurement value representing a measurement of the flow meter after a target interval duration; c1Representing the scale parameter; n represents the fourth measurement value.
Specifically, when the measuring instrument is a flow measuring instrument and the fan or the compressor runs in a frequency conversion mode, the gas volume flow q 'in the pipeline'v＝C1n, however, since the gas density may be decreased due to the mixing of the rare gas, the differential pressure measured by the flow meter is decreased, and the flow measurement value q is causedvAnd actual value q'vInconsistent, namely:
q′v＝C1n
from equations (10) and (11), it can be found that when the measuring instrument is a flow rate measuring instrument, the second gas density is:
as an optional implementation manner of the embodiment of the present invention, if the blower or the compressor operates at the variable frequency and the fixed frequency, and the measuring instrument for acquiring the first measurement value includes a differential gas pressure measuring instrument or a flow measuring instrument, determining a proportional parameter according to the first measurement value and the fourth measurement value, and calculating the second gas density according to the first measurement value, the fourth measurement value, and the proportional parameter, further includes: when the measuring instrument is a differential pressure measuring instrument, the second gas density is calculated according to the following formula:
wherein Δ p represents a first measurement value of the differential pressure measuring instrument measured after a target interval duration;
specifically, when the measuring instrument is a differential pressure measuring instrument and the fan or the compressor operates at a constant frequency, the volume flow of the gas in the pipeline is not changed, namely qv＝qv0The second gas density can be obtained according to equations (2) and (6):
when the measuring instrument is a flow measuring instrument, the second gas density is calculated according to the following formula:
in the formula, qvRepresents a first measured value of the flow meter measured after a target interval duration.
Specifically, when the measuring instrument is a flow meter and the fan or the compressor is operated at a constant frequency, the volumetric flow rate of the gas in the pipeline is constant, but since the gas density is decreased due to the possibility of mixing of rare gas, the differential pressure measured by the flow meter is decreased, and the flow measurement value q is caused to be a flow measurement value qvAnd actual value q'vInconsistent, namely:
q′v＝qv0
from equations (14) and (15), it can be found that when the measuring instrument is a flow rate measuring instrument, the second gas density is:
as an optional implementation manner of the embodiment of the present invention, the measuring the content of the rare gas in the pipeline according to the first gas density, the second gas density and the rare gas density to be measured includes: calculating the content of the rare gas in the pipeline according to the first gas density, the second gas density and the density of the rare gas to be measured by the following formula:
in the formula, ρ1Represents the aboveA first gas density; rho2Representing the second gas density; rho4Representing the rare gas density to be measured.
And then calculating the content of the rare gas in the pipeline according to the obtained first gas density, the second gas density and the density of the rare gas to be measured.
Specifically, when the measuring instrument is a differential pressure measuring instrument and the fan or the compressor operates at variable frequency, the rare gas content in the pipeline under the condition can be obtained by substituting the formula (1), the formula (5) and the formula (9) into the formula (17):
when the measuring instrument is a flow pressure measuring instrument and a fan or a compressor runs in a variable frequency mode, the formulas (1), (5) and (12) are replaced by the formula (17), so that the content of the rare gas in the pipeline under the condition can be obtained:
when the measuring instrument is a differential pressure measuring instrument and a fan or a compressor runs at a constant frequency, the formulas (1), (5) and (13) are substituted into the formula (17), so that the content of the rare gas in the pipeline under the condition can be obtained:
when the measuring instrument is a flow pressure measuring instrument and a fan or a compressor operates at a constant frequency, the formulas (1), (5) and (16) are substituted into the formula (17), so that the content of the rare gas in the pipeline under the condition can be obtained:
the embodiment of the invention also provides a device for measuring the gas content in the pipeline, as shown in fig. 3, a measuring instrument for measuring gas parameters is arranged in the pipeline, the measuring instrument is connected with a fan or a compressor in the pipeline, and the filling gas in the pipeline is air which does not contain rare gas to be measured in the initial state of the operation of gas-using equipment; the device includes:
a first obtaining module 401, configured to obtain a second measurement value of a measurement instrument used for collecting a gas pressure in a pipeline and a third measurement value of the measurement instrument used for collecting a gas temperature in the pipeline, respectively, if the fan or the compressor is running; for details, refer to the related description of step S101 in the above method embodiment.
A first calculation module 402 for calculating a first gas density according to the second measurement value and the third measurement value; for details, refer to the related description of step S102 in the above method embodiment.
A second obtaining module 403, configured to obtain, when a target interval is reached, a first measurement value of a measurement instrument used for collecting a differential pressure and/or a flow rate of gas in the pipeline, a second measurement value of the measurement instrument used for collecting a gas pressure in the pipeline, a third measurement value of the measurement instrument used for collecting a gas temperature in the pipeline, and a fourth measurement value of the measurement instrument used for collecting a rotational speed of the fan or the compressor, respectively; for details, refer to the related description of step S103 in the above method embodiment.
A second calculating module 404, configured to calculate a second gas density according to a gas differential pressure value collected by a gas differential pressure measuring instrument and a flow value collected by a flow measuring instrument when the measuring instrument used for collecting the first measured value includes the gas differential pressure measuring instrument and the flow measuring instrument; for details, refer to the related description of step S104 in the above method embodiment.
A third calculation module 405, configured to determine a proportional parameter according to the first measurement value and the fourth measurement value and calculate a second gas density according to the first measurement value, the fourth measurement value and the proportional parameter when the measurement instrument for acquiring the first measurement value includes a differential gas pressure measurement instrument or a flow measurement instrument; for details, refer to the related description of step S105 in the above method embodiment.
A fourth calculating module 406, configured to determine, according to the second measured value and the third measured value, a density of the rare gas to be measured, which is mixed in the current pipeline; for details, refer to the related description of step S106 in the above method embodiment.
The measuring module 407 is configured to measure the content of the rare gas in the pipeline according to the first gas density, the second gas density, and the rare gas density to be measured; for details, refer to the related description of step S107 in the above method embodiment.
According to the pipeline gas content measuring device provided by the embodiment of the invention, the device can be used for measuring the content of rare gas in air flow under the condition that other detecting instruments are not added, and the measuring method is simple; the differential pressure and/or flow measuring instrument has the advantages of quick response, convenient maintenance and low cost.
As an optional implementation manner of the embodiment of the present invention, the apparatus further includes: the third acquisition module is used for respectively acquiring a gas differential pressure value acquired by the gas differential pressure measurement instrument and a flow value acquired by the flow measurement instrument if the fan or the compressor runs; and the fifth calculation module is used for calculating the first gas density according to the gas differential pressure value and the flow value.
As an optional implementation manner of the embodiment of the present invention, the apparatus further includes: the first processing module is used for vacuumizing the pipeline and filling air which does not contain rare gas to be measured in the pipeline; and the second processing module is used for carrying out continuous purging processing on the pipeline filled with the air which does not contain the rare gas to be measured.
As an optional implementation manner of the embodiment of the present invention, the apparatus further includes:
a sixth calculating module, configured to calculate a first gas density according to the gas differential pressure value and the flow value according to the following formula, including:
in the formula,. DELTA.p0Representing a first measured value, q, of the differential pressure measuring device in an initial statev0A first measurement value representing the flow meter in an initial state; a represents the obtainable constant:
wherein C represents the outflow coefficient of the flow measuring instrument, and is dimensionless; beta represents the diameter ratio and is dimensionless; epsilon represents the expansion coefficient and has no dimension; d represents the primary device orifice or throat diameter.
As an optional implementation manner of the embodiment of the present invention, the apparatus further includes:
a seventh calculating module, configured to calculate the second gas density according to the following formula if the measuring instrument is a differential pressure measuring instrument:
wherein Δ p represents a first measurement value of the differential pressure measuring instrument measured after a target interval duration;
an eighth calculating module, configured to, when the measuring instrument is a flow measuring instrument, calculate the second gas density according to the following formula:
in the formula, qvA first measurement value representing a measurement of the flow meter after a target interval duration; c1Representing the scale parameter; n represents the fourth measurement value.
As an optional implementation manner of the embodiment of the present invention, the apparatus further includes:
a ninth calculating module, configured to calculate the second gas density according to the following formula if the measuring instrument for acquiring the first measurement value is a gas differential pressure measuring instrument when the fan or the compressor operates at the variable frequency and the fixed frequency:
wherein Δ p represents a first measurement value of the differential pressure measuring instrument measured after a target interval duration;
a tenth calculating module, configured to, when the measuring instrument used for acquiring the first measurement value is a flow measuring instrument, calculate the second gas density according to the following equation:
in the formula, qvRepresents a first measured value of the flow meter measured after a target interval duration.
As an optional implementation manner of the embodiment of the present invention, the apparatus further includes: an eleventh calculating module, configured to calculate a rare gas content in the pipeline according to the first gas density, the second gas density, and the rare gas density to be measured by using the following formula:
in the formula, ρ1Representing the first gas density; rho2Representing the second gas density; rho4Representing the rare gas density to be measured.
The functional description of the pipeline gas content measuring device provided by the embodiment of the invention refers to the pipeline gas content measuring method in the above embodiment in detail.
An embodiment of the present invention further provides a storage medium, as shown in fig. 4, on which a computer program 601 is stored, where the instructions are executed by a processor to implement the steps of the pipeline gas content measuring method in the foregoing embodiment. The storage medium is also stored with audio and video stream data, characteristic frame data, an interactive request signaling, encrypted data, preset data size and the like. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.
An embodiment of the present invention further provides an electronic device, as shown in fig. 5, the electronic device may include a processor 51 and a memory 52, where the processor 51 and the memory 52 may be connected by a bus or in another manner, and fig. 5 takes the connection by the bus as an example.
The processor 51 may be a Central Processing Unit (CPU). The Processor 51 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 52, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as the corresponding program instructions/modules in the embodiments of the present invention. The processor 51 executes various functional applications and data processing of the processor by executing non-transitory software programs, instructions and modules stored in the memory 52, namely, implements the pipeline gas content measurement method in the above method embodiment.
The memory 52 may include a storage program area and a storage data area, wherein the storage program area may store an operating device, an application program required for at least one function; the storage data area may store data created by the processor 51, and the like. Further, the memory 52 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 52 may optionally include memory located remotely from the processor 51, and these remote memories may be connected to the processor 51 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 52 and, when executed by the processor 51, perform a pipeline gas content measurement method as in the embodiment of fig. 1-2.
The details of the electronic device may be understood by referring to the corresponding descriptions and effects in the embodiments shown in fig. 1 to fig. 2, and are not described herein again.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A pipeline gas content measuring method is characterized in that a measuring instrument for measuring gas parameters is arranged in a pipeline and connected with a fan or a compressor in the pipeline, and filling gas in the pipeline is air which does not contain rare gas to be measured in an initial state of operation of gas-using equipment; the method is characterized by comprising the following steps:
if the fan or the compressor runs, respectively acquiring a second measurement value of a measuring instrument for acquiring gas pressure in the pipeline and a third measurement value of the measuring instrument for acquiring gas temperature in the pipeline;
calculating a first gas density from the second and third measurements;
when the target interval is reached, respectively acquiring a first measurement value of a measuring instrument for acquiring gas differential pressure and/or flow in a pipeline, a second measurement value of the measuring instrument for acquiring gas pressure in the pipeline, a third measurement value of the measuring instrument for acquiring gas temperature in the pipeline and a fourth measurement value of the measuring instrument for acquiring the rotating speed of a fan or a compressor;
when the measuring instrument used for acquiring the first measured value comprises a gas differential pressure measuring instrument and a flow measuring instrument, calculating a second gas density according to a gas differential pressure value acquired by the gas differential pressure measuring instrument and a flow value acquired by the flow measuring instrument;
when the measuring instrument used for collecting the first measured value comprises a gas differential pressure measuring instrument or a flow measuring instrument, determining a proportional parameter according to the first measured value and the fourth measured value and calculating a second gas density according to the first measured value, the fourth measured value and the proportional parameter;
determining the density of the rare gas to be measured mixed in the current pipeline according to the second measurement value and the third measurement value;
and measuring the content of the rare gas in the pipeline according to the first gas density, the second gas density and the density of the rare gas to be measured.
2. The method of claim 1, wherein the measurement instruments used to collect the first measurement value include a differential gas pressure measurement instrument and a flow measurement instrument, the method further comprising:
if the fan or the compressor runs, respectively acquiring a gas differential pressure value acquired by the gas differential pressure measuring instrument and a flow value acquired by the flow measuring instrument;
and calculating the first gas density according to the gas differential pressure value and the flow value.
3. The method of claim 1, wherein prior to obtaining a second measurement from a meter for collecting gas pressure in the pipeline and a third measurement from a meter for collecting gas temperature in the pipeline if the fan or compressor is operating, respectively, the method further comprises:
vacuumizing the pipeline and filling air which does not contain rare gas to be measured in the pipeline;
the line filled with air not containing the rare gas to be measured is subjected to a continuous purge treatment.
4. The method of claim 2, wherein said calculating a first gas density from said differential gas pressure value and said flow value comprises: calculating a first gas density according to the gas differential pressure value and the flow value according to the following formula:
in the formula,. DELTA.p0Representing a first measured value, q, of the differential pressure measuring device in an initial statev0A first measurement value representing the flow meter in an initial state; a represents the obtainable constant:
wherein C represents the outflow coefficient of the flow measuring instrument, and is dimensionless; beta represents the diameter ratio and is dimensionless; epsilon represents the expansion coefficient and has no dimension; d represents the primary unit orifice or throat diameter。
5. The method of claim 1 or 4, wherein if the fan or compressor is operated at variable frequency, and the measuring instrument for collecting the first measurement value comprises a differential gas pressure measuring instrument or a flow measuring instrument, determining a proportional parameter according to the first measurement value and the fourth measurement value, and calculating a second gas density according to the first measurement value, the fourth measurement value and the proportional parameter, comprises:
when the measuring instrument is a differential pressure measuring instrument, the second gas density is calculated according to the following formula:
wherein Δ p represents a first measurement value of the differential pressure measuring instrument measured after a target interval duration; c2Representing the scale parameter; n represents the fourth measurement value;
when the measuring instrument is a flow measuring instrument, the second gas density is calculated according to the following formula:
in the formula, qvA first measurement value representing a measurement of the flow meter after a target interval duration; c1Representing the scale parameter; n represents the fourth measurement value.
6. The method of claim 4, wherein the measuring instrument for collecting the first measurement value when the fan or the compressor is operated at variable frequency and fixed frequency is a differential gas pressure measuring instrument, and the second gas density is calculated according to the following formula:
wherein Δ p represents a first measurement value of the differential pressure measuring instrument measured after a target interval duration;
when the measuring instrument used for acquiring the first measurement value is a flow measuring instrument, the second gas density is calculated according to the following formula:
in the formula, qvRepresents a first measured value of the flow meter measured after a target interval duration.
7. The method according to claim 1 or 2, wherein the measuring the rare gas content in the pipeline from the first gas density, the second gas density and the rare gas density to be measured comprises:
calculating the content of the rare gas in the pipeline according to the first gas density, the second gas density and the density of the rare gas to be measured by the following formula:
in the formula, ρ1Representing the first gas density; rho2Representing the second gas density; rho4Representing the rare gas density to be measured.
8. A pipeline gas content measuring device is provided with a measuring instrument for measuring gas parameters in a pipeline, the measuring instrument is connected with a fan or a compressor in the pipeline, and filling gas in the pipeline is air which does not contain rare gas to be measured in an initial state of operation of gas-using equipment; it is characterized by comprising:
the first acquisition module is used for respectively acquiring a second measurement value of a measuring instrument for acquiring gas pressure in the pipeline and a third measurement value of the measuring instrument for acquiring gas temperature in the pipeline if the fan or the compressor runs;
the first calculation module is used for calculating a first gas density according to the second measurement value and the third measurement value;
the second acquisition module is used for respectively acquiring a first measurement value of a measuring instrument for acquiring gas differential pressure and/or flow in the pipeline, a second measurement value of the measuring instrument for acquiring gas pressure in the pipeline, a third measurement value of the measuring instrument for acquiring gas temperature in the pipeline and a fourth measurement value of the measuring instrument for acquiring the rotating speed of the fan or the compressor when the target interval is reached;
the second calculation module is used for calculating a second gas density according to the gas differential pressure value acquired by the gas differential pressure measurement instrument and the flow value acquired by the flow measurement instrument when the measurement instrument for acquiring the first measurement value comprises the gas differential pressure measurement instrument and the flow measurement instrument;
the third calculation module is used for determining a proportional parameter according to the first measurement value and the fourth measurement value and calculating a second gas density according to the first measurement value, the fourth measurement value and the proportional parameter when the measuring instrument used for acquiring the first measurement value comprises a gas differential pressure measuring instrument or a flow measuring instrument;
the fourth calculation module is used for determining the density of the rare gas to be measured mixed in the current pipeline according to the second measurement value and the third measurement value;
and the measuring module is used for measuring the content of the rare gas in the pipeline according to the first gas density, the second gas density and the density of the rare gas to be measured.
9. A computer readable storage medium having stored thereon computer instructions for causing a computer to perform the pipeline gas content measurement method of any one of claims 1-7.
10. An electronic device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the pipeline gas content measurement method according to any one of claims 1 to 7.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080066559A1 (en) * | 2006-09-19 | 2008-03-20 | Johansen Espen S | Wet-gas flowmeter |
| CN101571500A (en) * | 2008-04-30 | 2009-11-04 | 刘庆杰 | Method and device for light hydrocarbon gas calorific-value on-line analysis |
| RU2445581C1 (en) * | 2010-08-24 | 2012-03-20 | Федеральное государственное унитарное предприятие федеральный научно-производственный центр "Научно-исследовательский институт измерительных систем им. Ю.Е. Седакова" | Method of fast determination of liquid phase volume content in gas-liquid flow and device to this end |
| CN103616313A (en) * | 2013-11-29 | 2014-03-05 | 齐增海 | On-line gas density measuring method |
| KR20140136308A (en) * | 2013-05-20 | 2014-11-28 | 주식회사 엔박 | a volume perceiving ilquid flow meter program and the ilquid flow rate measuring method |
| CN104792656A (en) * | 2015-03-17 | 2015-07-22 | 北京航天试验技术研究所 | Method and system for real-time measurement of parahydrogen content in liquid hydrogen |
| CN105091967A (en) * | 2015-08-13 | 2015-11-25 | 辽宁聚焦科技有限公司 | Method for measuring flow through pipeline or obstacle in pipeline |
| CN106731527A (en) * | 2016-12-12 | 2017-05-31 | 浙江大学 | The denitrogenation method and device of refinery hydrogen stream stock |
| CN109506729A (en) * | 2018-12-27 | 2019-03-22 | 西安安森智能仪器股份有限公司 | A kind of biphase gas and liquid flow parameter online test method and device |
-
2021
- 2021-12-24 CN CN202111608424.2A patent/CN114279888B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080066559A1 (en) * | 2006-09-19 | 2008-03-20 | Johansen Espen S | Wet-gas flowmeter |
| CN101571500A (en) * | 2008-04-30 | 2009-11-04 | 刘庆杰 | Method and device for light hydrocarbon gas calorific-value on-line analysis |
| RU2445581C1 (en) * | 2010-08-24 | 2012-03-20 | Федеральное государственное унитарное предприятие федеральный научно-производственный центр "Научно-исследовательский институт измерительных систем им. Ю.Е. Седакова" | Method of fast determination of liquid phase volume content in gas-liquid flow and device to this end |
| KR20140136308A (en) * | 2013-05-20 | 2014-11-28 | 주식회사 엔박 | a volume perceiving ilquid flow meter program and the ilquid flow rate measuring method |
| CN103616313A (en) * | 2013-11-29 | 2014-03-05 | 齐增海 | On-line gas density measuring method |
| CN104792656A (en) * | 2015-03-17 | 2015-07-22 | 北京航天试验技术研究所 | Method and system for real-time measurement of parahydrogen content in liquid hydrogen |
| CN105091967A (en) * | 2015-08-13 | 2015-11-25 | 辽宁聚焦科技有限公司 | Method for measuring flow through pipeline or obstacle in pipeline |
| CN106731527A (en) * | 2016-12-12 | 2017-05-31 | 浙江大学 | The denitrogenation method and device of refinery hydrogen stream stock |
| CN109506729A (en) * | 2018-12-27 | 2019-03-22 | 西安安森智能仪器股份有限公司 | A kind of biphase gas and liquid flow parameter online test method and device |
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