CN111811623A - Auxiliary judgment method for measuring flow of high-pressure gas supply - Google Patents
Auxiliary judgment method for measuring flow of high-pressure gas supply Download PDFInfo
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- CN111811623A CN111811623A CN202010715207.2A CN202010715207A CN111811623A CN 111811623 A CN111811623 A CN 111811623A CN 202010715207 A CN202010715207 A CN 202010715207A CN 111811623 A CN111811623 A CN 111811623A
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- pressure
- air flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/15—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention relates to the technical field of gas flow measurement, in particular to an auxiliary judgment method for gas supply flow measurement of high-pressure gas, which comprises the following steps: step 1: reading the pressure parameters of the pressure meters and the air flow parameters of the two air flow meters; step 2: comparing the air flow parameter with the air flow setting range, and comparing the pressure parameter with the pressure setting range; and 3, step 3: and (3) acquiring a comparison result obtained in the step (2), and judging that the airflow meter corresponding to the airflow parameter opposite to the pressure parameter comparison result is abnormal when the comparison results of the two airflow parameters are different. In the prior art, when the airflow parameter is abnormal, whether the airflow meter is abnormal or not is difficult to judge. Compared with the prior art, the method and the device have the advantages that whether the gas flow instrument is abnormal or not is effectively judged through mutual verification of the gas flow parameter and the pressure parameter, so that the phenomenon that the whole nuclear power station enters an abnormal state due to the abnormality of the gas flow instrument is avoided.
Description
Technical Field
The invention relates to the technical field of gas flow measurement, in particular to an auxiliary judgment method for gas supply flow measurement of high-pressure gas.
Background
In the nuclear power station, for the AP1000 unit, a master control room emergency habitability (VES) system is designed, so that the habitability of the personnel for master control under the design benchmark accident is provided, and the life safety of the personnel in the master control room is guaranteed. In order to make the master control room habitability, it is necessary to stably supply breathable air to the master control room. In design, the supply of breathable air is required to maintain a positive pressure in the main control room relative to the ambient environment of 31Pa for more than 72 hours. For safety reasons, the supply air flow needs to be measured periodically. Current measurement methods measure the air flow of the air supply duct mainly by means of an air flow meter. Although the corresponding data can be effectively acquired, when the reading of the air flow meter is abnormal, it is difficult to accurately judge whether the reading is abnormal or the air supply system is abnormal due to the abnormal phenomena such as aging of the air flow meter. At this time, in the special consideration of nuclear safety, a conservative decision is needed to make the unit enter a specific state specified by a safety analysis report of the nuclear power plant, and even defense quitting may be needed, for example: and the shutdown seriously influences the normal production operation of the unit. Therefore, a method is required for accurately determining whether or not the airflow volume meter itself is abnormal.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides an auxiliary judgment method for measuring the flow of high-pressure gas supply.
In order to solve the technical problems, the invention provides the following technical scheme:
an auxiliary judgment method for measuring the flow of high-pressure gas supply comprises the following steps: step 1: reading the pressure parameters of the pressure meters and the air flow parameters of the two air flow meters;
step 2: comparing the air flow parameter with the air flow setting range, and comparing the pressure parameter with the pressure setting range;
and 3, step 3: and (3) acquiring a comparison result obtained in the step (2), and judging that the airflow meter corresponding to the airflow parameter opposite to the comparison result of the pressure parameter is abnormal when the comparison results of the two airflow parameters are different.
A pressure instrument and two air flow meters are arranged on an air supply pipeline of the main control emergency habitability system. The pressure parameters of the pressure meters are read, and the air flow parameters of the two air flow meters are read. And comparing the two air flow parameters with the air flow set range, and comparing the pressure parameter with the pressure set range. And acquiring a comparison result, and judging that the airflow meter corresponding to the airflow parameter opposite to the comparison result of the pressure parameter is abnormal when the comparison results of the two airflow parameters are different. For example: the two air flow parameters are respectively C1 and C2, the pressure parameter is B, when the C1 is in the air flow setting range, the C2 is outside the air flow setting range, and when the B is in the pressure setting range, the comparison results of the C1 and the B are the same, and the two comparison results are verified mutually, so that the fact that the air supply pipeline of the current main control emergency habitability system is normal is shown, and the fact that the air flow instrument of the C2 air flow parameter is abnormal can be further proved. At the moment, only the corresponding gas flow instrument needs to be maintained or replaced, so that the whole nuclear power station is effectively prevented from entering an abnormal state.
Further, step 3 further comprises the following steps:
step 3-1: calculating a difference between the airflow volume parameters when the comparison result of the airflow volume parameters is normal;
step 3-2: comparing the difference with a nominal value, and recording the air flow parameter when the difference is greater than the nominal value.
Further, the rating was 6.8 cubic meters per hour.
Further, the air flow setting range is 101.9 cubic meters per hour to 118.9 cubic meters per hour;
the pressure setting range is: 0.62 MPa to 0.68 MPa.
Further, the method for calculating the airflow volume setting range and the pressure setting range comprises the following steps:
step A1: calculating theoretical air flow and theoretical pressure;
step A2: and acquiring a gas flow set range according to the theoretical gas flow, and acquiring a pressure set range according to the theoretical pressure.
Further, the theoretical air flow is: q = pi/4 d ^ 2V; the theoretical pressure is: p =1/2 × ρ V ˆ 2; wherein d is the inner diameter of the pipeline, V is the gas flow velocity, and ρ is the gas density.
Further, a pressure meter is arranged upstream of the two air flow meters.
Compared with the prior art, the invention has the following advantages:
the reliability of the gas flow parameter is improved through mutual verification of the pressure parameter and the gas flow parameter.
When one of the air flow parameters is out of the air flow setting range, the reason that the air flow parameter is out of the air flow setting range is the abnormality of the air supply pipeline or the abnormality of the air flow meter can be effectively distinguished through mutual verification of the pressure parameter and the air flow parameter.
By monitoring the difference between the two air flow volume parameters, an anomaly of the air flow volume meter is prevented in advance.
Drawings
FIG. 1: a method flow diagram.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
An auxiliary judgment method for measuring the flow of high-pressure gas supply is characterized in that a pressure instrument and two gas flow meters are arranged on a gas supply pipeline of an emergency habitability system of a master control room in actual operation. The pressure instrument adopts an in-situ displayed spring tube pressure instrument with the precision of 0.25 percent and the measuring range of 2.5 MPa. The pressure gauge is arranged upstream of the two gas flow gauges, depending on the direction of flow of the gas in the gas supply duct.
And acquiring the inner diameter d of the gas supply pipeline, the gas flow velocity V in the pipeline and the gas density rho. Calculating the air flow set range and the pressure set range according to the following steps:
step A1: calculating theoretical air flow and theoretical pressure;
step A2: and acquiring a gas flow set range according to the theoretical gas flow, and acquiring a pressure set range according to the theoretical pressure.
Wherein, the theoretical gas flow is: q = π/4 d ^ 2V, theoretical pressure: p =1/2 ρ V ˆ 2, and the minimum value and the maximum value of the theoretical airflow can be obtained according to the actual engineering requirements, thereby defining the airflow setting range. According to the actual engineering requirements, the minimum value of the theoretical pressure and the maximum value of the theoretical pressure can be obtained, and therefore the pressure setting range is defined. Meanwhile, according to a calculation formula, the gas flow and the pressure are both related to the gas flow velocity V, so that physical association exists between the gas flow and the pressure, the accuracy of the pressure parameter can be verified through the gas flow parameter, and the accuracy of the gas flow parameter can also be verified through the pressure parameter.
It should be noted that the calculated airflow setting range and the pressure setting range do not take into account the elbow, the reducing diameter, the valve throttling, etc., so that a field test is still required to adjust the airflow setting range and the pressure setting range during actual operation. The regulated gas flow is set to range from 101.9 cubic meters per hour to 118.9 cubic meters per hour and the pressure is set to range from 0.62 mpa to 0.68 mpa.
When the running state of the air supply pipeline needs to be checked, the following steps are executed:
step 1: reading the pressure parameters of the pressure meters and the air flow parameters of the two air flow meters;
step 2: comparing the air flow parameter with the air flow setting range, and comparing the pressure parameter with the pressure setting range;
and 3, step 3: and (3) acquiring a comparison result obtained in the step (2), and judging that the airflow meter corresponding to the airflow parameter opposite to the pressure parameter comparison result is abnormal when the comparison results of the two airflow parameters are different.
For example: the two air flow parameters are respectively C1 and C2, the pressure parameter is B, and when C1 is within the air flow set range, C2 is outside the air flow set range, and B is within the pressure set range. At this time, C1 and B mutually verified, thereby proving that the current air supply duct is in a normal state, indicating that the air flow meter reading the air flow parameter C2 is abnormal. Therefore, only the abnormal gas flow meter needs to be repaired or replaced, and the whole nuclear power station is effectively prevented from entering an abnormal state.
Similarly, the abnormality of the pressure instrument can be proved through mutual verification of two air flow parameters. For example: c1, C2 are within the air flow setting and B is outside the pressure setting. At this time, C1 and C2 mutually verify that the air supply pipeline is in a normal state, indicating that the pressure instrument is abnormal.
It is worth noting that although providing two airflow meters increases construction costs, it is not possible to provide only one airflow meter. On the one hand, the two gas flow meters provide a redundant display function, when one gas flow meter fails to display a numerical value, corresponding data can be read through the other gas flow meter, and on the other hand, if only one gas flow meter is arranged, when the comparison result of the gas flow parameters is opposite to that of the pressure parameters, due to the lack of the verification of the third parameter, it is difficult to distinguish whether the gas flow meter is abnormal or the pressure meter is abnormal.
Wherein, step 3 further comprises the following steps: step 3-1: when the comparison result of the airflow parameters is normal, namely when the two airflow parameters are both within the airflow setting range, calculating the difference value between the airflow parameters;
step 3-2: the difference is compared to a nominal value and when the difference is greater than the nominal value, the airflow parameter is recorded.
The rated value is 6.8 cubic meters per hour, if the two air flow parameters are within the air flow set range and the difference value between the two air flow parameters is larger than 6.8 cubic meters per hour, although the air supply pipeline can be proved to be normal, the difference between the two air flow parameters is too large, which indicates that the two air flow meters have abnormal risks, and at the moment, the two air flow parameters are recorded so as to prevent the abnormality of the air flow meters in advance.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (7)
1. An auxiliary judgment method for measuring the flow of high-pressure gas supply is characterized by comprising the following steps: the method comprises the following steps:
step 1: reading the pressure parameters of the pressure meters and the air flow parameters of the two air flow meters;
step 2: comparing the air flow parameter with an air flow setting range, and comparing the pressure parameter with a pressure setting range;
and 3, step 3: and (3) acquiring a comparison result obtained in the step (2), and judging that the airflow meter corresponding to the airflow parameter opposite to the comparison result of the pressure parameter is abnormal when the comparison results of the two airflow parameters are different.
2. An auxiliary judgment method for measurement of supply gas flow of high-pressure gas according to claim 1, characterized in that: the step 3 further comprises the following steps:
step 3-1: calculating a difference between the air flow volume parameters when the comparison result of the air flow volume parameters is normal;
step 3-2: comparing the difference to a nominal value, and recording the airflow quantity parameter when the difference is greater than the nominal value.
3. An auxiliary judgment method for measurement of supply gas flow of high-pressure gas according to claim 2, characterized in that: the rating is 6.8 cubic meters per hour.
4. An auxiliary judgment method for measurement of supply gas flow of high-pressure gas according to claim 1, characterized in that: the set range of the air flow is 101.9 cubic meters per hour to 118.9 cubic meters per hour;
the pressure setting range is as follows: 0.62 MPa to 0.68 MPa.
5. The method of any one of claims 1 to 4, wherein the method further comprises: the method for calculating the airflow setting range and the pressure setting range comprises the following steps:
step A1: calculating theoretical air flow and theoretical pressure;
step A2: and acquiring the set range of the gas flow according to the theoretical gas flow, and acquiring the set range of the pressure according to the theoretical pressure.
6. An auxiliary judgment method for measurement of supply gas flow of high-pressure gas according to claim 5, characterized in that: the theoretical gas flow is: q = pi/4 d ^ 2V;
the theoretical pressure is as follows: p =1/2 × ρ V ˆ 2;
wherein d is the inner diameter of the pipeline, V is the gas flow velocity, and ρ is the gas density.
7. An auxiliary judgment method for measurement of supply gas flow of high-pressure gas according to claim 1, characterized in that: the pressure meter is disposed upstream of the two air flow meters.
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| CN103471686A (en) * | 2013-09-17 | 2013-12-25 | 陕西天仪智能仪表有限公司 | Gas flow standard device and application method thereof |
| CN107462305A (en) * | 2017-08-08 | 2017-12-12 | 天信仪表集团有限公司 | A kind of flowmeter inline diagnosis method |
| CN208313535U (en) * | 2018-06-20 | 2019-01-01 | 河南省计量科学研究院 | Door/window testing machine calibrating installation and combinations thereof gas flowmeter |
| CN110118589A (en) * | 2019-03-27 | 2019-08-13 | 天津新科成套仪表有限公司 | A kind of apparatus and method for demarcating measuring instrument |
| CN111213109A (en) * | 2017-11-29 | 2020-05-29 | 株式会社富士金 | Method for diagnosing abnormality of fluid supply line |
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2020
- 2020-07-23 CN CN202010715207.2A patent/CN111811623B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200947054Y (en) * | 2006-09-11 | 2007-09-12 | 朱天寿 | Online real flow calibrating apparatus for natural gas flowmeter |
| CN103471686A (en) * | 2013-09-17 | 2013-12-25 | 陕西天仪智能仪表有限公司 | Gas flow standard device and application method thereof |
| CN107462305A (en) * | 2017-08-08 | 2017-12-12 | 天信仪表集团有限公司 | A kind of flowmeter inline diagnosis method |
| CN111213109A (en) * | 2017-11-29 | 2020-05-29 | 株式会社富士金 | Method for diagnosing abnormality of fluid supply line |
| CN208313535U (en) * | 2018-06-20 | 2019-01-01 | 河南省计量科学研究院 | Door/window testing machine calibrating installation and combinations thereof gas flowmeter |
| CN110118589A (en) * | 2019-03-27 | 2019-08-13 | 天津新科成套仪表有限公司 | A kind of apparatus and method for demarcating measuring instrument |
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