CN115406497A - Gas flow indicating method and system - Google Patents
Gas flow indicating method and system Download PDFInfo
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- CN115406497A CN115406497A CN202211041183.2A CN202211041183A CN115406497A CN 115406497 A CN115406497 A CN 115406497A CN 202211041183 A CN202211041183 A CN 202211041183A CN 115406497 A CN115406497 A CN 115406497A
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- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/06—Indicating or recording devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
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- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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Abstract
The application relates to the technical field of gas monitoring, in particular to a gas flow indicating method and system. The method comprises the following steps: acquiring a differential pressure test section; acquiring differential pressure information according to the differential pressure test section; judging whether the pressure difference information meets a preset pressure difference condition or not; if the preset pressure difference condition is met, acquiring a corresponding pressure difference measuring point; acquiring corresponding pipe section information according to the differential pressure measuring points; analyzing the pipe section type of the pipe section information, and setting corresponding differential pressure sampling points; acquiring a target pressure difference according to the pressure difference sampling point; processing the target pressure difference according to a preset pressure difference rule to generate a target gas flow rate; acquiring relation curve data according to the target pressure difference and the target gas flow rate; and combining the relation curve data and the pipe section information to generate a gas flow indicated value. The application provides a gas flow indicating method and system, which has the effect of improving the gas flow indicating performance in the pipeline.
Description
Technical Field
The application relates to the technical field of gas monitoring, in particular to a gas flow indicating method and system.
Background
With the improvement of the control requirement on the atmospheric pollution source, the effective collection and transportation of the atmospheric pollution source gas become an important control node, and the emission reduction effect of pollutants and the daily operation cost of a system are related.
At present, gas collection systems in many occasions, such as the covered collection systems of sewage treatment facilities of many enterprises, are provided with a plurality of gas collection points for collecting polluted peculiar smell gases in different areas, and are provided with complex gas collection and transportation pipeline systems.
Because the aperture of the regulating valve changes due to vibration, the gas collecting device is damaged due to gas corrosion, and the deposition of partial substances in the gas is blocked, the gas collecting system often has the situation that the gas delivery flow and the design flow have great deviation in actual operation, and the operators cannot timely know the flow information of the gas flow in each pipeline, and cannot timely and effectively adjust and control the gas flow, so that the overall collecting effect is poor.
Disclosure of Invention
In order to improve the indicating performance of the gas flow in the pipeline, the application provides a gas flow indicating method and a gas flow indicating system.
In a first aspect, the present application provides a gas flow indicating method, comprising the steps of:
acquiring a differential pressure test section;
acquiring differential pressure information according to the differential pressure test section;
judging whether the pressure difference information meets a preset pressure difference condition or not;
if the preset pressure difference condition is met, acquiring a corresponding pressure difference measuring point;
acquiring corresponding pipe section information according to the differential pressure measuring points;
analyzing the type of the pipe section information, and setting corresponding differential pressure sampling points;
acquiring a target pressure difference according to the pressure difference sampling point;
processing the target pressure difference according to a preset pressure difference rule to generate a target gas flow rate;
obtaining relation curve data according to the target pressure difference and the target gas flow rate;
and combining the relation curve data and the pipe section information to generate a gas flow indicated value.
By adopting the technical scheme, whether the differential pressure information of the pipeline internal pressure difference test section accords with the preset differential pressure condition or not is judged so as to obtain differential pressure test points corresponding to the differential pressure information according to the preset differential pressure condition, the type of the pipeline section where the pipeline section is located is further analyzed according to the differential pressure test points, corresponding differential pressure sampling points are set, corresponding target differential pressure is obtained, the accuracy of the obtained target differential pressure is further improved, the target differential pressure is processed by applying a preset differential pressure rule to generate a target gas flow rate, corresponding relation curve data is obtained by combining the target differential pressure and the target gas flow rate, a gas flow indicated value is generated according to the actual condition of the pipeline contained by the pipeline section, the relation curve data and the pipeline section information, and therefore the indicating performance of the gas flow in the pipeline is improved.
Optionally, the analyzing the pipe section type of the pipe section information, and setting the corresponding pressure difference sampling point includes the following steps:
judging the type of the pipe section information;
if the pipe section is a straight pipe section, acquiring pipe diameter information, and setting a sampling point of the pressure difference of the straight pipe section according to a preset straight pipe setting rule and the pipe diameter information;
and if the mixed pipe section is the mixed pipe section, acquiring mixed pipe information, and setting a mixed pipe section differential pressure sampling point according to a preset mixed pipe setting rule and the mixed pipe information.
By adopting the technical scheme, according to the actual pipe section type of the pipeline in the pipe section information, the corresponding pressure difference sampling points which are set according to the relevant setting rules are further combined, so that the accuracy of obtaining the target pressure difference subsequently is improved.
Optionally, the step of setting the sampling point of the pressure difference of the mixing pipe section according to the preset mixing pipe setting rule and the mixing pipe information comprises the following steps:
acquiring elbow port position information according to the mixing pipe information;
acquiring a target distance standard according to the preset mixing pipe setting rule;
and setting the differential pressure sampling point of the mixing pipe section according to the target distance standard and the position information of the elbow port.
By adopting the technical scheme, the distance between the differential pressure sampling point of the mixing pipe section and the port of the elbow is set according to the target distance standard, so that the influence of vortex on pressure is reduced, and the accuracy of a pressure value is ensured.
Optionally, the processing the target pressure difference according to a preset pressure difference rule to generate a target gas flow rate includes the following steps:
acquiring a corresponding resistance coefficient according to the type of the pipe section information;
acquiring the pipe section gas density in the pipe section information;
and calculating the target pressure difference, the resistance coefficient and the gas density of the pipe section according to a preset pressure difference rule to generate the target gas flow rate.
By adopting the technical scheme, the flow velocity of the target gas can be conveniently estimated through a preset pressure difference rule according to the resistance coefficient, the gas density of the pipe section and the corresponding target pressure difference.
Optionally, after acquiring the corresponding drag coefficient according to the pipe segment type of the pipe segment information, the method includes the following steps:
acquiring corresponding pipe section specification information according to the pipe section type of the pipe section information;
and calculating the specification information of the pipe section and the resistance coefficient according to a preset resistance rule to generate the corresponding resistance coefficient.
By adopting the technical scheme, the corresponding resistance coefficient is obtained by combining the specific specification information of the pipe sections in the pipe section information, so that the accuracy of obtaining the pipeline resistance of each pipe section type is improved.
Optionally, the acquiring the relation curve data according to the target pressure difference and the target gas flow rate further includes:
acquiring corresponding on-way resistance according to the straight pipe specification information;
acquiring corresponding local resistance according to the specification information of the mixing pipe;
and calculating the on-way resistance and the local resistance according to a preset resistance rule to obtain relation curve data.
By adopting the technical scheme, the corresponding on-way resistance and the local resistance are analyzed according to the type of the specific pipe section of the pipeline, so that the relation curve data between the target pressure difference and the target gas flow rate can be conveniently obtained.
Optionally, the generating the gas flow indication value by combining the relationship curve data and the pipe section information includes the following steps:
acquiring the corresponding gas temperature of the pipe network according to the pipe section information;
judging whether the gas temperature of the pipe network exceeds a preset temperature difference threshold value or not;
if the temperature difference is in the preset temperature difference threshold value, reading the relation curve data to generate the gas flow indicated value;
if the temperature exceeds the preset temperature difference threshold value, partitioning the gas temperature of the pipe network to generate a target temperature partition;
obtaining the current gas temperature according to the target temperature partition;
and calculating the target pressure difference and the current temperature according to a preset flow rule to generate the indicated value of the gas flow.
By adopting the technical scheme, the gas temperature of the pipe network which is not in accordance with the preset temperature difference threshold value is partitioned, so that the occurrence of the condition of obtaining a large gas flow indicated value error is reduced.
Optionally, the obtaining the current gas temperature according to the target temperature partition includes the following steps:
acquiring a temperature fluctuation value of the target temperature partition according to a preset time length standard;
judging whether the temperature fluctuation value exceeds a preset fluctuation threshold value or not;
and if the temperature of the target temperature subarea exceeds a preset fluctuation threshold value, performing temperature correction on the target temperature subarea, and acquiring the current gas temperature of the corrected target temperature subarea until the temperature fluctuation value of the current gas temperature is in the preset fluctuation threshold value.
By adopting the technical scheme, the temperature of the target temperature partition exceeding the preset fluctuation threshold is corrected, so that the accuracy of acquiring the indicated value of the gas flow is improved conveniently.
Optionally, after the target differential pressure and the current temperature are calculated according to a preset flow rule and the gas flow indication value is generated, the method further includes the following steps:
acquiring a real-time gas flow value according to the gas flow indicated value;
judging whether the real-time gas flow value meets a preset flow deviation standard or not;
and if the real-time gas flow value does not meet the preset flow deviation standard, generating an alarm signal according to the real-time gas flow value.
By adopting the technical scheme, the real-time gas flow value which does not accord with the preset flow deviation standard is alarmed, so that the alarming is convenient to be carried out when the gas flow is abnormal, and on the other hand, the abnormal state corresponding to the gas flow can be obtained in real time through the real-time gas flow value.
In a second aspect, the present application further provides a gas flow indicator system comprising:
the first acquisition module is used for acquiring a differential pressure test section;
the second acquisition module is used for acquiring differential pressure information according to the differential pressure test section;
the judging module is used for judging whether the pressure difference information meets a preset pressure difference condition or not;
the third acquisition module acquires a corresponding pressure difference measuring point if the preset pressure difference condition is met;
the fourth acquisition module is used for acquiring corresponding pipe section information according to the differential pressure measuring point;
the analysis module is used for analyzing the type of the pipe section information and setting corresponding differential pressure sampling points;
the fifth acquisition module is used for acquiring a target pressure difference according to the pressure difference sampling point;
the processing module is used for processing the target pressure difference according to a preset pressure difference rule to generate a target gas flow rate;
the data module is used for acquiring relation curve data according to the target pressure difference and the target gas flow rate;
and the generating module is used for combining the relation curve data and the pipe section information to generate a gas flow indicated value.
By adopting the technical scheme, whether the differential pressure information acquired by the second acquisition module in the differential pressure test section acquired by the first acquisition module in the pipeline accords with the preset differential pressure condition or not is judged according to the judgment module, so that the third acquisition module acquires differential pressure measurement points corresponding to the differential pressure information according to the preset differential pressure condition, the fourth acquisition module acquires corresponding pipe section information according to the differential pressure measurement points, the analysis module is further used for analyzing the pipe section type of the pipe section information where the differential pressure measurement points are located, corresponding differential pressure sampling points are set, the fifth acquisition module is combined to acquire the corresponding target differential pressure, the accuracy of the acquired target differential pressure is further improved, the processing module is used for processing the target differential pressure according to the preset differential pressure rule to generate the target gas flow velocity, the data module is used for combining the target differential pressure and the target gas flow velocity to acquire corresponding relation curve data, and finally, the generation module is used for generating the gas flow indicated value according to the actual condition of the pipeline, the relation curve data and the pipe section information, and accordingly the indicating performance of the gas flow in the pipeline is improved.
To sum up, the application comprises the following beneficial technical effects: the method comprises the steps of judging whether differential pressure information in a pipeline meets a preset differential pressure condition or not so as to obtain differential pressure measuring points corresponding to the differential pressure information meeting the preset differential pressure condition, further analyzing the type of a pipeline section of the pipeline section information according to the differential pressure measuring points, setting corresponding differential pressure sampling points, obtaining corresponding target differential pressure, further improving the accuracy of the obtained target differential pressure, processing the target differential pressure by using a preset differential pressure rule to generate a target gas flow rate, obtaining corresponding relation curve data by combining the target differential pressure and the target gas flow rate, and generating a gas flow indicated value according to the actual condition of the pipeline, the relation curve data and the pipeline section information contained in the pipeline section, so that the indicating performance of the gas flow in the pipeline is improved.
Drawings
FIG. 1 is an overall view of a volume collection system for a method of gas flow indication according to the present application.
Fig. 2 is a schematic flow chart of steps S101 to S109 in a gas flow rate indication method according to the present application.
Fig. 3 is a schematic flow chart of steps S201 to S203 in a gas flow rate indicating method according to the present application.
Fig. 4 is a schematic flow chart of steps S301 to S303 in a gas flow rate indication method according to the present application.
Fig. 5 is a schematic flow chart of steps S401 to S403 in a gas flow rate indicating method according to the present application.
Fig. 6 is a schematic flow chart illustrating steps S501 to S502 in a gas flow indicating method according to the present application.
Fig. 7 is a schematic flow chart illustrating steps S601 to S604 in a gas flow indicating method according to the present application.
FIG. 8 is a graph of differential pressure and flow rate in a pipeline illustrating a method of gas flow indication according to the present application.
FIG. 9 is a graph of differential pressure and flow rate of a conduit according to a method of indicating gas flow according to the present application.
Fig. 10 is a schematic flow chart illustrating steps S701 to S706 in a gas flow rate indicating method according to the present application.
Fig. 11 is a schematic flow chart of steps S801 to S803 in a gas flow rate indicating method according to the present application.
Fig. 12 is a schematic flow chart of steps S901 to S903 in a gas flow rate indication method according to the present application.
FIG. 13 is a block diagram of a gas flow indicating method of the present application.
Description of the reference numerals:
1. a first acquisition module; 2. a second acquisition module; 3. a judgment module; 4. a third obtaining module; 5. a fourth obtaining module; 6. an analysis module; 7. a fifth obtaining module; 8. a processing module; 9. a data module; 10. and generating a module.
Detailed Description
The present application is described in further detail below with reference to figures 1-13.
For the convenience of explaining the scheme, as shown in fig. 1, the scheme is an overall composition of the gas collection system, wherein a reference numeral 1 is a gas collection port, a reference numeral 2 is a micro differential pressure gauge, a reference numeral 3 is a fan, a reference numeral 4 is a condenser, a reference numeral 5 is a straight pipe section, a reference numeral 6 is an elbow pipe section, a reference numeral 7 is a pipe fitting (reducing), and a reference numeral 8 is purification equipment.
The technology applied by the scheme is mainly based on the principle of fluid pressure difference, the monitoring of the flow of the pipeline system is realized by measuring the fluid pressure difference of pipelines and pipe fittings with different pipe section types and further combining a pre-calibrated formula, and the method can be used for monitoring the main pipe of a gas collecting pipeline system, the flow of each straight pipe, the treatment air quantity of a pollution treatment system and the like, and can also be used for balance debugging of the flow of a more complicated gas pipeline system and the like.
The embodiment of the application discloses a gas flow indicating method, as shown in fig. 2, comprising the following steps:
s101, acquiring a differential pressure test section;
s102, acquiring differential pressure information according to a differential pressure test section;
s103, judging whether the pressure difference information meets a preset pressure difference condition or not;
s104, if the preset pressure difference condition is met, acquiring a corresponding pressure difference measuring point;
s105, acquiring corresponding pipe section information according to the differential pressure measuring points;
s106, analyzing the type of the pipe section information, and setting corresponding differential pressure sampling points;
s107, acquiring a target pressure difference according to the pressure difference sampling point;
s108, processing the target pressure difference according to a preset pressure difference rule to generate a target gas flow rate;
s109, acquiring relation curve data according to the target pressure difference and the target gas flow rate;
and S110, combining the relation curve data and the pipe section information to generate a gas flow indicated value.
The differential pressure test section in steps S101 to S104 is a differential pressure test section for flow monitoring selected for a pipeline requiring flow monitoring in the gas piping network system according to the specific condition of the gas piping network system, the differential pressure information is differential pressure numerical information between differential pressure test sections in the pipeline, the preset differential pressure condition is a differential pressure detection standard and detection position information specified in the pipeline monitoring system, and the differential pressure measurement point is a differential pressure detection position in the differential pressure information that meets the preset differential pressure condition.
For example, the pressure difference detection standard specified in the pipeline monitoring system is that the pressure difference is greater than or equal to 5Pa, a pressure difference measurement point is arranged at the position of a pipe section, a pipe fitting or various types of gas processing equipment connected in series according to a preset pressure difference condition, and the pressure difference of the pressure difference measurement point is greater than or equal to 5Pa.
In order to improve the accuracy of acquiring the differential pressure of the differential pressure measuring point, the differential pressure measuring point is arranged on a section with a consistent pipe diameter, and if the section of the equal-diameter pipe cannot be found before and after the reducer pipe, the problem can be solved through pipe diameter correction.
The pipe section type of the pipe section information in the steps S105 to S106 refers to the pipe section type information of the pipe section in which the pipe section is located, wherein the pipe section type of the pipe comprises a straight pipe, an elbow and a reducing pipe, and the differential pressure sampling point refers to a sampling point selected from pressure measuring points according to the specific condition of the pipe section information.
In addition, a pressure difference sampling point is set according to the precision of the existing sensor, the actual conditions of each branch pipe and each main pipe of the pipe network system and a preset principle.
The target pressure difference from step S107 to step S108 is a total pressure difference value of the pressure difference sampling points, the preset pressure difference rule is a preset formula and related data related to calculating a target gas flow rate, and the target gas flow rate is a gas flow rate in the pipeline.
The target pressure difference refers to the total pressure difference of the pipeline, and because the pipeline section is measured by static pressure in the scheme, the corresponding total pressure difference can be obtained only by ensuring the same dynamic pressure between the sections.
Static pressure refers to the pressure of the gas acting on the surface of an object parallel to the gas flow, i.e. the pressure overcoming the resistance of the pipeline; the dynamic pressure is a form of converting kinetic energy required in gas flow into pressure, namely the pressure driving the gas to move forward.
The static pressure is the potential energy of unit volume gas, is a force, and is expressed by compressing the gas and applying pressure to the pipe wall, and the absolute static pressure of the gas in the pipeline can be positive pressure which is higher than the ambient atmospheric pressure, and can also be negative pressure which is lower than the ambient atmospheric pressure; the dynamic pressure is the kinetic energy per unit volume of gas, and is also the first force, and is represented by changing the velocity of the gas in the pipe, and the dynamic pressure only acts on the flowing direction of the gas and is constant positive.
The total pressure is equal to the static pressure plus pressure, the pressure generated by the irregular movement of air molecules and impacting on the pipe wall is called the static pressure, the static pressure taking the absolute vacuum as the calculation zero point is called the absolute static pressure, and the static pressure taking the atmospheric pressure as the zero point is called the relative static pressure.
The relation curve data in the steps S109 to S110 is obtained by obtaining target pressure difference data, target gas flow rate data and corresponding pipe section information according to a pre-detection or pre-set pressure difference rule, and further obtaining relation curve data between the pipeline pressure difference and the pipeline flow rate according to the target pressure difference and the target gas flow rate corresponding to each specific pipe section; the gas flow indicated value is indicated information of the pipeline gas flow obtained according to the relation curve data or the related gas flow calculation rule.
In the actual gas flow detection instruction, the gas delivery flow and the design flow often generate great deviation, so that operators cannot obtain information about whether the gas flow of related pipelines is normal or not, and the overall performance of a gas collection system fails due to the fact that the operators cannot effectively perform branch adjustment control. If a method for installing a large amount of gas flow on a pipeline is adopted, the flowmeter fails due to the corrosivity of waste gas, manual detection is adopted, a sampling hole with a preset caliber, such as a sampling hole with the caliber of D75, needs to be formed according to a common standard, and the test workload is huge, and professional operation skills are needed.
According to the gas flow indicating method provided by the embodiment, whether the pressure difference information in the pipeline meets the preset pressure difference condition or not is judged, so that pressure difference measuring points corresponding to the pressure difference information meeting the preset pressure difference condition are obtained, the type of the information pipeline section of the pipeline section where the pressure difference measuring points are located is further analyzed according to the pressure difference measuring points, corresponding pressure difference sampling points are set, the corresponding target pressure difference is obtained, the accuracy of the obtained target pressure difference is further improved, the target pressure difference is processed by using the preset pressure difference rule, the target gas flow rate is generated, and the corresponding relation curve data is obtained by combining the target pressure difference and the target gas flow rate. The gas flow indicated value is generated according to the actual condition of the pipeline contained in the pipeline section, the relation curve data and the pipeline section information, so that the indicating performance of the gas flow in the pipeline is improved.
In one implementation of this embodiment, as shown in fig. 3, step S105 includes the following steps:
s201, judging the type of the pipe section information;
s202, if the pipe section is a straight pipe section, acquiring pipe diameter information, and setting a straight pipe section pressure difference sampling point according to a preset straight pipe setting rule and the pipe diameter information;
s203, if the mixed pipe section is the mixed pipe section, obtaining mixed pipe information, and setting a mixed pipe section pressure difference sampling point according to a preset mixed pipe setting rule and the mixed pipe information.
In the actual application, the pipe diameter information refers to the pipe diameter information of a straight pipe section, the preset straight pipe setting rule refers to the rule of a pressure difference sampling point of the straight pipe section, the mixed pipe section refers to the mixed pipe section of the straight pipe section and the elbow, the mixed pipe information refers to the number of the elbows and the length and the pipe diameter information of the straight pipe sections at the two ends of the connecting elbow, and the mixed pipe setting rule refers to the rule of setting the pressure difference sampling point of the straight pipe section and the elbow pipe section.
The pressure sampling port of the pressure difference sampling point is arranged on the peripheries of 225 degrees, -0 degrees, -13 degrees and 5 degrees of the circumference of the measuring pipe section or the peripheries of 270 degrees, -0 degrees and-90 degrees of the rectangular pipe, and the U-shaped bottom liquid drainage and liquid seal mechanism is arranged on the high-humidity gas pressure sampling pipe, so that the phenomenon that the pressure sampling pipe is blocked by condensate liquid and the function failure of the pressure sampling pipe is caused is reduced.
For example, a certain pipe section only has a straight pipe pipeline, corresponding pipe diameter information is obtained, corresponding straight pipe section pressure difference sampling points are set according to preset straight pipe setting rules and different straight pipe pipeline pipe diameters, wherein the distance ratio of the straight pipe pipeline diameter to the corresponding pressure difference sampling points is 1.
In the above related application scenarios, the pipe diameter of the straight pipe is 142cm according to the attributes of the straight pipe, and the distance ratio between the pipe diameter of the straight pipe and the corresponding differential pressure sampling point is 1 according to the preset straight pipe setting rule, so that the distance between the differential pressure sampling points of the straight pipe sections in the straight pipe is 142cm × 10=1420cm.
For another example, a certain pipe section is formed by connecting a straight pipe and an elbow, the setting rule can be obtained according to the preset mixing pipe, the pressure difference sampling point of the mixing pipe section is arranged between 1-10 elbows, and the ratio of the length of the straight pipe connected with the two ends of the elbows to the pipe diameter is 1-1.
In the above-mentioned relevant application scenario, the number of the elbows of a certain pipe section is 9, the length of the straight pipe connected with the two ends of the elbow is 10cm and the pipe diameter is 100cm through relevant detection, and the ratio of the corresponding pipe length to the pipe diameter is 1:10, the sampling point of the pressure difference of the mixing pipe section is arranged between the 9 bends.
According to the gas flow indicating method provided by the embodiment, the corresponding pressure difference sampling points which are set according to the relevant setting rules are further combined according to the actual pipe section type of the pipeline in the pipe section information, so that the accuracy of acquiring the target pressure difference from the pressure difference sampling points is improved.
In one implementation of this embodiment, as shown in fig. 4, step S203 includes the following steps:
s301, acquiring elbow port position information according to the mixing pipe information;
s302, acquiring a target distance standard according to a preset mixing pipe setting rule;
and S303, setting a differential pressure sampling point of the mixed pipe section according to the target distance standard and the position information of the elbow port.
In practical application, the mixing pipe information refers to the position of a differential pressure sampling point of a mixing pipe section and the position information of ports of each elbow, and the position information of the ports of the elbows refers to the position information of the ports at the two ends of the elbows; the preset setting rule of the mixing pipe refers to the distance standard between the position of two ports of a preset elbow and a differential pressure sampling point of the mixing pipe section; the target distance standard refers to the distance standard between the position of the elbow port and the nearest mixing pipe section differential pressure sampling point.
For example, the positions of two ports of an elbow of a certain mixing pipe section are obtained according to the position information of the elbow port, and further, the target distance standard obtained according to the preset mixing pipe setting rule is that the distance between the differential pressure sampling point of the mixing pipe section and the elbow port is larger than or equal to 13cm, and the distance between the differential pressure sampling point of the mixing pipe section and the positions of the two ports of the elbow is set to be 13cm or more.
According to the gas flow indicating method provided by the embodiment, the distance between the differential pressure sampling point of the mixing pipe section and the port of the elbow is set according to the target distance standard, so that the influence of vortex on pressure is reduced, and the accuracy of a pressure value is ensured.
In one implementation of this embodiment, as shown in fig. 5, step S107 includes the following steps:
s401, acquiring a corresponding resistance coefficient according to the type of the pipe section information;
s402, acquiring the gas density of the pipe section in the pipe section information;
and S403, calculating the target pressure difference, the resistance coefficient and the gas density of the pipe section according to a preset pressure difference rule to generate the target gas flow rate.
In practical application, the resistance coefficient is that of a straight pipe, an elbow, a reducing pipe and related pipe fittings; the pipe section gas density refers to the density of gas in the pipe section, wherein the pipe section gas density can be obtained through a calculation formula of related gas density; the preset pressure difference rule refers to an operational formula among the target pressure difference, the resistance coefficient, the pipe section gas density and the target gas flow rate.
For example, the operation formula in the preset pressure difference rule is as follows:
wherein Δ P refers to a target pressure differential in Pa; xi is a resistance coefficient; rho g Is the pipe section gas density; v is the target gas flow rate of the gas. The target pressure difference of the elbow pipe section is 200Pa, the resistance coefficient is 0.25, the gas density of the pipe section is 1.25, and the target gas flow rate can be estimated to be 35.7 through the formula.
According to the gas flow indicating method provided by the embodiment, the flow velocity of the target gas can be conveniently estimated according to the resistance coefficient, the gas density of the pipe section and the corresponding target pressure difference through a preset pressure difference rule.
In one implementation of this embodiment, as shown in fig. 6, step S401 includes the following steps:
s501, acquiring corresponding pipe section specification information according to the pipe section type of the pipe section information;
and S502, calculating the specification information of the pipe section according to a preset resistance rule to generate a corresponding resistance coefficient.
In practical application, the pipe section specification information refers to specification information of relevant pipes such as a straight pipe, an elbow and a reducing pipe, and the preset resistance rule refers to a rule for obtaining a corresponding resistance coefficient by performing operation according to the specification information of the relevant pipes such as the straight pipe, the elbow and the reducing pipe.
For example, the pipe section type of the pipe section information includes length information and caliber information of the pipe section, the preset resistance rule refers to a rule for converting the length information and the caliber information of the pipe section into corresponding resistance coefficients, and then the preset resistance rule is used for calculating the length information and the caliber information of a certain pipe section to generate the corresponding resistance coefficients of the pipe section.
According to the gas flow indicating method provided by the embodiment, the corresponding resistance coefficient is obtained by combining the specific specification information of the pipe sections in the pipe section information, so that the accuracy of obtaining the pipeline resistance of each pipe section type is improved.
In one embodiment of this embodiment, as shown in fig. 7, the pipe section type of the pipe section specification information includes straight pipe specification information and mixed pipe specification information, and the step S108 further includes the steps of:
s601, acquiring corresponding on-way resistance according to the specification information of the straight pipe;
s602, acquiring corresponding local resistance according to the specification information of the mixing pipe;
s603, calculating on-way resistance and local resistance according to a preset flow rule to generate corresponding target pressure difference and target gas flow rate;
and S604, acquiring relation curve data according to the target pressure difference and the target gas flow rate.
In practical use, the straight pipe specification information refers to the specification and dimension information of a straight pipe, and the mixed pipe specification information refers to the specification and dimension information of relevant pipe fittings such as an elbow and a reducer pipe.
The resistance of fluid flowing in the pipeline can be divided into on-way resistance and local resistance, wherein the on-way resistance is the resistance generated by the internal friction of the fluid when the fluid passes through a straight pipe with a certain pipe diameter; the local resistance is mainly caused by the resistance of the fluid flowing through local parts such as pipe fittings, valves and sudden expansion or reduction of the cross section of the pipeline, and is also called physical resistance, and the total resistance of the fluid flowing in the pipeline is the sum of the on-way resistance and the local resistance.
In addition, due to the viscous action of air, the surface of the object generates a frictional force tangential to the surface of the object, and the resultant force of all the frictional forces is called frictional resistance. The resultant resistance of the air flow pressure perpendicular to the object plane is called differential pressure resistance, and the differential pressure resistance of the object in subsonic flow is zero without considering viscosity and without wake vortex.
In actual fluid, not only friction resistance is generated under the action of viscosity, but also the pressure distribution of an object surface is different from that of ideal fluid, and differential pressure resistance is generated. For objects with good streamlining, the pressure differential resistance due to viscosity is much less than the frictional resistance without boundary separation.
For example, a straight pipe exists in a certain pipe section, and the on-way resistance calculation formula corresponding to the straight pipe operation is as follows: r = (lambda/D) ([ nu ^2 ]. Gamma./2 g), wherein, nu is the flow rate; lambda is a resistance coefficient; gamma is the gas density; d is the diameter of the pipeline; r is on-way resistance, g is gravity acceleration, relevant specification information such as corresponding pipeline diameter and the like can be obtained through the specification information of the straight pipe, corresponding target pressure difference and corresponding target gas flow velocity can be obtained through a pressure difference sampling point of a pipe section of the straight pipe subsequently, and then relevant relation curve data can be obtained. FIG. 8 is a graph showing an example of the relationship between the flow rate and the pressure difference of a straight pipe, wherein the straight pipe is a plastic pipe with a diameter of 500 mm.
For another example, a certain pipe section has an elbow, a reducing pipe, and other related pipe fittings, when the air flow section changes, the pipe fittings (such as various reducing pipes, air pipe inlets and outlets, and valves), the flow direction changes (the elbow), and the flow changes (such as the tee, the cross, the side of the air pipe, and the air outlet) all generate local resistance, the local resistance is according to the following formula: z = xi ν 2 ρ/2, xi is a local resistance coefficient, and Z is local resistance ρ and air density in the duct. Relevant specification information such as the corresponding pipeline diameter can be obtained through the specification information of the mixing pipe, the corresponding target pressure difference and the corresponding target gas flow velocity can be obtained through the pressure difference sampling point of the mixing pipe section subsequently, and then relevant relation curve data can be obtained. An exemplary graph of flow rate versus pressure differential for a 90 elbow conduit is shown in fig. 9, where the resistance coefficient for a single elbow is 0.25.
According to the gas flow indicating method provided by the embodiment, the corresponding on-way resistance and the local resistance are analyzed according to the specific pipe section type of the pipeline, so that the relation curve data between the target pressure difference and the target gas flow speed can be conveniently acquired.
In one embodiment of the present embodiment, as shown in fig. 10, the pipe section type of the pipe section specification information includes straight pipe specification information and mixed pipe specification information, and step S109 further includes the steps of:
s701, acquiring the corresponding gas temperature of the pipe network according to the pipe section information;
s702, judging whether the gas temperature of the pipe network exceeds a preset temperature difference threshold value or not;
s703, if the temperature difference is at a preset temperature difference threshold value, reading the relation curve data to generate a gas flow indicated value;
s704, if the temperature exceeds a preset temperature difference threshold value, partitioning the gas temperature of the pipe network to generate a target temperature partition;
s705, partitioning according to the target temperature to obtain the current gas temperature;
and S706, calculating a target pressure difference and a current temperature according to a preset flow rule to generate a gas flow indicated value.
In practical application, the gas temperature of the pipe network refers to the temperature of gas in each pipe section, the preset temperature difference threshold refers to a relative deviation threshold of a preset calibrated temperature difference, the target temperature partition refers to an area divided according to a preset rule and the temperature of each pipe section, and the preset flow rule refers to an electronic table computing system of a data center.
For example, if the relative deviation threshold of the pre-calibrated temperature difference is within 10%, and the deviation between the gas temperatures of the pipe network is 6%, the data of the relationship curve is read, the gas flow calibration curve is further obtained through calculation of the corresponding pipe diameter size, and the direct reading is directly carried out from the gas flow calibration curve.
For another example, after the relevant temperature measurement, the deviation between the pipe network gas temperatures is 11%, the pipe network gas temperatures are partitioned, the corresponding current temperatures and the corresponding target pressure differences are further obtained according to the partitioned target temperature partitions, and then the current temperatures and the target pressure differences of the target temperature partitions are input into a spreadsheet calculation system of the data center to generate corresponding gas flow indicated values.
According to the gas flow indicating method provided by the embodiment, the gas temperature of the pipe network which does not meet the preset temperature difference threshold value is partitioned, so that the situation that the error of the obtained gas flow indicated value is large is reduced.
In one embodiment of this embodiment, as shown in fig. 11, the pipe section type of the pipe section specification information includes straight pipe specification information and mixed pipe specification information, and the step S705 further includes the steps of:
s801, acquiring a temperature fluctuation value of a target temperature partition according to a preset time length standard;
s802, judging whether the temperature fluctuation value exceeds a preset fluctuation threshold value;
and S803, if the temperature exceeds the preset fluctuation threshold, performing temperature correction on the target temperature partition, and acquiring the current gas temperature of the corrected target temperature partition until the temperature fluctuation value of the current gas temperature is in the preset fluctuation threshold.
In practical application, the preset time standard refers to a detection time period set for detecting the temperature change of the gas in the target temperature partition; the temperature fluctuation value is an amplitude value of the temperature change of the gas in the target temperature partition; the preset fluctuation threshold value is a safe amplitude value of the gas temperature change in the target temperature partition.
For example, if the gas in the pipe network has a large temperature difference, the pipe network is subjected to temperature partitioning to generate a plurality of target temperature partitions, and 1 gas temperature is set in each temperature partition; the preset time standard is 1 hour, the temperature fluctuation value of the exhaust gas is less than or equal to 10% within 1 hour, the temperature fluctuation value of the target temperature partition is detected to be 11% when the pipe network is actually operated, the temperature fluctuation value of the target temperature partition is corrected once every 1 hour, and the current gas temperature of the corrected target temperature partition is obtained until the temperature fluctuation value of the target temperature partition is less than or equal to 10%.
For example, when the pipe network is actually operated, if the temperature fluctuation value of the detected target temperature partition is 8%, the gas temperature of the pipe network is detected every 1 hour, and the detected gas temperature value is displayed.
In the gas flow indicating method provided in this embodiment, the temperature of the target temperature partition exceeding the preset fluctuation threshold is corrected, so as to facilitate the accuracy of obtaining the gas flow indicating value.
In one implementation manner of this embodiment, as shown in fig. 12, the following steps are further included after step S706:
s901, acquiring a real-time gas flow value according to a gas flow indicated value;
s902, judging whether the real-time gas flow value meets a preset flow deviation standard or not;
and S903, if the flow rate does not meet the preset flow rate deviation standard, generating an alarm signal according to the real-time gas flow rate value.
In practical application, the real-time gas flow value refers to the real-time gas flow of a pipe network in practical operation, the preset flow deviation standard refers to the standard of gas flow deviation allowance,
for example, the deviation of the gas flow per minute is required to be less than or equal to 15% according to the preset deviation standard, the real-time flow condition of the gas in the pipe network is calculated and displayed according to the spreadsheet of the data center, and the deviation of the gas flow per minute of the pipeline is 18%, the deviation value of the current real-time gas flow is obtained, and a corresponding alarm signal is generated according to the deviation value.
For another example, the real-time flow rate of the gas in the pipe network is calculated and displayed according to the spreadsheet in the data center, and if the deviation of the gas flow rate in the pipe per minute is 11%, the deviation value of the current real-time gas flow rate is obtained and displayed.
The gas flow indicating method provided by the embodiment alarms the real-time gas flow value which does not accord with the preset flow deviation standard, so that the alarm is convenient to alarm when the gas flow is abnormal, and on the other hand, the abnormal state corresponding to the gas flow can be obtained in real time through the real-time gas flow value.
In an application scenario of the gas flow indicating method, related data monitoring such as indicating the gas flow in a pipe network can be performed in different ways.
For example, in manual inspection, as shown in fig. 1, pipe section total pressure measurement points are arranged on two sides of an elbow 6, a reducer 7, equipment 2, 8 or a straight pipe section 5 in a pipe network system, a micro differential pressure gauge 2 (an inclined pipe liquid level gauge can also be adopted) is installed, and during system debugging, a resistance coefficient calibration value, a section pressure difference and a gas flow velocity curve of the pipe section of the related pipe under a working condition are measured.
On the other hand, if the gas in the pipe network has large temperature difference change, the pipe network needs to be subjected to temperature partition according to the relative deviation value of the temperature difference with the calibrated temperature difference, 1 gas thermometer is arranged in each temperature partition, when the pipe network actually operates, temperature and pressure difference data are read, whether the difference between the gas temperature and the calibrated working condition temperature is more than 10% or not is judged, if the difference is less than 10%, direct reading can be directly carried out from a flow calibration curve, and if the difference exceeds 10%, the pressure difference and the gas temperature can be directly input into an electronic table to be calculated to obtain the gas flow.
For another example, in the automatic measurement display, as shown in fig. 1, pipe section full pressure measurement points are provided on both sides of an elbow 6, a reducer 7, and equipment 2, 8 or a straight pipe section 5 in a pipe network system, and a digital differential pressure gauge 2 with a wireless data transmission function is attached to the pipe section full pressure measurement points, and a data collection and processing center is provided. During system debugging, resistance coefficient calibration curves of related pipe sections of the pipe fittings under the working condition are measured to establish a spreadsheet, if gas of a pipe network has large temperature difference, the pipe network needs to be subjected to temperature division, and 1 gas thermometer is arranged in each temperature area.
When the pipe network is in actual operation, the pressure difference data of the thermometer is read according to the preset detection frequency, the real-time flow condition of the gas in the pipe network is calculated and displayed through the spreadsheet of the data center, and an alarm can be given when the flow deviation exceeds the preset flow deviation standard.
The present embodiment further discloses a gas flow indicating system, as shown in fig. 13, including:
the first acquisition module 1 is used for acquiring a differential pressure test section;
the second acquisition module 2 is used for acquiring differential pressure information according to the differential pressure test section;
the judging module 3 is used for judging whether the pressure difference information meets a preset pressure difference condition or not;
the third acquisition module 4 is used for acquiring a corresponding pressure difference measuring point if the preset pressure difference condition is met;
the fourth acquisition module 5 is used for acquiring corresponding pipe section information according to the differential pressure measuring points;
the analysis module 6 is used for analyzing the type of the pipe section information and setting corresponding pressure difference sampling points;
the fifth acquisition module 7 is used for acquiring a target differential pressure according to the differential pressure sampling point;
the processing module 8 is used for processing the target pressure difference according to a preset pressure difference rule to generate a target gas flow rate;
the data module 9 is used for acquiring relation curve data according to the target pressure difference and the target gas flow rate;
and a generating module 10 for combining the relation curve data and the pipe section information to generate a gas flow indicated value.
By adopting the technical scheme, whether the pressure difference information acquired by the second acquisition module 2 in the pressure difference test section acquired by the first acquisition module 1 in the pipeline meets the preset pressure difference condition is judged according to the judgment module 3, so that the third acquisition module 4 acquires the pressure difference measurement point corresponding to the pressure difference information meeting the preset pressure difference condition, the fourth acquisition module 5 acquires the corresponding pipe section information according to the pressure difference measurement point, the analysis module 6 is further used for analyzing the pipe section type of the pipe section information where the pressure difference measurement point is located, the corresponding pressure difference sampling point is set, the fifth acquisition module 7 is used for acquiring the corresponding target pressure difference, the accuracy of the acquired target pressure difference is further improved, the target pressure difference is processed by the processing module 8 according to the preset pressure difference rule to generate the target gas flow rate, the data module 9 is used for acquiring the corresponding relation curve data, and the generation module 10 is used for generating the indicated value flow of the gas according to the actual condition of the pipeline, the relation curve data and the pipe section information, so that the indicating performance of the gas flow in the pipeline is improved.
It should be noted that, the system provided in this embodiment of the present application further includes each module and/or corresponding sub-module corresponding to a logic function or a logic step of any one of the above-mentioned gas flow rate indication methods, so as to achieve the same effect as each logic function or logic step, and details thereof are not repeated herein.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A method of indicating a flow of gas, comprising the steps of:
acquiring a differential pressure test section;
acquiring differential pressure information according to the differential pressure test section;
judging whether the pressure difference information meets a preset pressure difference condition or not;
if the preset pressure difference condition is met, acquiring a corresponding pressure difference measuring point;
acquiring corresponding pipe section information according to the differential pressure measuring points;
analyzing the pipe section type of the pipe section information, and setting corresponding differential pressure sampling points;
acquiring a target pressure difference according to the pressure difference sampling point;
processing the target pressure difference according to a preset pressure difference rule to generate a target gas flow rate;
acquiring relation curve data according to the target pressure difference and the target gas flow rate;
and combining the relation curve data and the pipe section information to generate a gas flow indicated value.
2. The gas flow indicating method according to claim 1, wherein the step of analyzing the pipe section type of the pipe section information and setting the corresponding differential pressure sampling point comprises the following steps:
judging the type of the pipe section information;
if the pipe section is a straight pipe section, acquiring pipe diameter information, and setting a sampling point of the pressure difference of the straight pipe section according to a preset straight pipe setting rule and the pipe diameter information;
and if the mixed pipe section is the mixed pipe section, acquiring mixed pipe information, and setting a mixed pipe section pressure difference sampling point according to a preset mixed pipe setting rule and the mixed pipe information.
3. The gas flow indicating method according to claim 2, wherein the step of setting the mixing pipe section differential pressure sampling point according to the preset mixing pipe setting rule and the mixing pipe information comprises the following steps:
acquiring elbow port position information according to the mixing pipe information;
acquiring a target distance standard according to the preset mixing pipe setting rule;
and setting the differential pressure sampling point of the mixing pipe section according to the target distance standard and the position information of the elbow port.
4. The method of claim 1, wherein the step of processing the target differential pressure according to a preset differential pressure rule to generate a target gas flow rate comprises the steps of:
acquiring a corresponding resistance coefficient according to the type of the pipe section information;
acquiring the pipe section gas density in the pipe section information;
and calculating the target pressure difference, the resistance coefficient and the gas density of the pipe section according to a preset pressure difference rule to generate the target gas flow rate.
5. The gas flow indicating method according to claim 4, wherein the step of obtaining the corresponding resistance coefficient according to the pipe section type of the pipe section information comprises the following steps:
acquiring corresponding pipe section specification information according to the pipe section type of the pipe section information;
and calculating the specification information of the pipe section according to a preset resistance rule to obtain a corresponding resistance coefficient.
6. The gas flow indicating method according to claim 1, wherein the pipe section type of the pipe section information includes straight pipe specification information and mixed pipe specification information, and the acquiring of the relational curve data according to the target differential pressure and the target gas flow rate further includes the steps of:
acquiring corresponding on-way resistance according to the straight pipe specification information;
acquiring corresponding local resistance according to the specification information of the mixing pipe;
and calculating the on-way resistance and the local resistance according to a preset flow rule to obtain relation curve data.
7. A method of indicating a flow of gas as in claim 1 wherein said combining said relationship curve data and said spool piece information to generate a gas flow indicator value comprises the steps of:
acquiring the corresponding gas temperature of the pipe network according to the pipe section information;
judging whether the gas temperature of the pipe network exceeds a preset temperature difference threshold value or not;
if the preset temperature difference threshold value is not exceeded, reading the relation curve data to generate the gas flow indicated value;
if the preset temperature difference threshold value is exceeded, partitioning the gas temperature of the pipe network to generate a target temperature partition;
obtaining the current gas temperature according to the target temperature partition;
and calculating the target pressure difference and the current temperature according to a preset flow rule to generate the indicated value of the gas flow.
8. The method of claim 7, wherein the step of obtaining the current gas temperature according to the target temperature zone comprises the steps of:
acquiring a temperature fluctuation value of the target temperature partition according to a preset time length standard;
judging whether the temperature fluctuation value exceeds a preset fluctuation threshold value or not;
and if the temperature exceeds the preset fluctuation threshold, performing temperature correction on a target temperature partition, and acquiring the current gas temperature of the corrected target temperature partition until the temperature fluctuation value of the current gas temperature is in the preset fluctuation threshold.
9. The method of claim 7, wherein the step of generating the indicated value of gas flow after calculating the target differential pressure and the current temperature according to preset flow rules further comprises the steps of:
acquiring a real-time gas flow value according to the gas flow indicated value;
judging whether the real-time gas flow value meets a preset flow deviation standard or not;
and if the real-time gas flow value does not meet the preset flow deviation standard, generating an alarm signal according to the real-time gas flow value.
10. A gas flow indicator system, comprising:
the first acquisition module (1) is used for acquiring a differential pressure test section;
the second acquisition module (2) is used for acquiring differential pressure information according to the differential pressure test section;
the judging module (3) is used for judging whether the pressure difference information meets a preset pressure difference condition or not;
the third acquisition module (4) acquires a corresponding pressure difference measuring point if the preset pressure difference condition is met;
the fourth acquisition module (5) is used for acquiring corresponding pipe section information according to the differential pressure measuring point;
the analysis module (6) is used for analyzing the type of the pipe section information and setting corresponding pressure difference sampling points;
the fifth acquisition module (7) is used for acquiring the target differential pressure according to the differential pressure sampling point;
the processing module (8) is used for processing the target pressure difference according to a preset pressure difference rule to generate a target gas flow rate;
the data module (9) is used for acquiring relation curve data according to the target pressure difference and the target gas flow rate;
and the generating module (10) is used for combining the relation curve data and the pipe section information to generate a gas flow indicated value.
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