CN116539241A - Gas leakage detection method and device based on intelligent gas meter and concentration sensor - Google Patents
Gas leakage detection method and device based on intelligent gas meter and concentration sensor Download PDFInfo
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- CN116539241A CN116539241A CN202310513779.6A CN202310513779A CN116539241A CN 116539241 A CN116539241 A CN 116539241A CN 202310513779 A CN202310513779 A CN 202310513779A CN 116539241 A CN116539241 A CN 116539241A
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- 238000001514 detection method Methods 0.000 title claims abstract description 52
- 239000007789 gas Substances 0.000 claims abstract description 525
- 238000000034 method Methods 0.000 claims abstract description 42
- 239000002737 fuel gas Substances 0.000 claims abstract description 20
- 230000004927 fusion Effects 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims description 16
- 238000004880 explosion Methods 0.000 claims description 7
- 238000009423 ventilation Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 description 9
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- 230000005540 biological transmission Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 description 1
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- 235000011194 food seasoning agent Nutrition 0.000 description 1
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- 238000007500 overflow downdraw method Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels, explosives
- G01N33/225—Gaseous fuels, e.g. natural gas
Abstract
The invention provides a gas leakage detection method and device based on an intelligent gas meter and a concentration sensor. The method comprises the following steps: acquiring the gas flow from the intelligent gas meter in real time; acquiring the concentration of the fuel gas from a concentration measuring unit in real time; and judging whether the gas leakage exists or not based on the fusion of the gas flow and the gas concentration. The invention carries out gas leakage detection based on the fusion of the gas flow obtained from the intelligent gas meter in real time and the gas concentration obtained from the concentration measuring unit in real time, and compared with the prior art, the invention can only effectively detect more obvious leakage by detecting the gas concentration in a single measuring user room, improves the precision of gas leakage detection and the concentration range of gas leakage detection, and particularly improves the detection capability of weak gas leakage.
Description
Technical Field
The invention belongs to the technical field of gas leakage detection, and particularly relates to a gas leakage detection method and device based on an intelligent gas meter and a concentration sensor.
Background
With the popularization of gas application, leakage of gas facilities in residential users caused by damage and poor sealing occurs, but measures for detecting indoor leakage in industry have not reached ideal state. On one hand, the conventional detection method for gas leakage in residential users mainly carries out concentration overrun alarm by installing a gas alarm. The gas alarm commonly used in the market is difficult to effectively identify some tiny leakage conditions due to sensitivity limitation, and meanwhile, frequent false alarms are caused by interference of other components (such as seasoning volatile components, lampblack components and the like); on the other hand, after leakage occurs, the position, shape and size of the leakage point are difficult to effectively measure, so that the lost gas quantity lacks a reasonable estimation method, and further deviation is caused to purchase and sale difference accounting of a gas enterprise. Therefore, a fusion method is needed that can achieve both a wider concentration monitoring range for gas leakage and a reasonable estimation of the amount of gas leakage. At present, the intelligent gas meter rapidly popularized in the industry not only can directly monitor the change of the air flow, but also has the functions of data transmission and algorithm analysis, and is a better carrier of an indoor fusion safety monitoring scheme.
At present, the existing indoor gas leakage detection technology generally adopts a single detection means, and is difficult to accurately identify and early warn the tiny leakage. In addition, there is currently no effective method for estimating the amount of leakage after a leak has occurred indoors.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a gas leakage detection method and device based on an intelligent gas meter and a concentration sensor.
In order to achieve the above object, the present invention adopts the following technical scheme.
In a first aspect, the present invention provides a gas leakage detection method based on an intelligent gas meter and a concentration sensor, comprising the steps of:
acquiring the gas flow from the intelligent gas meter in real time;
acquiring the concentration of the fuel gas from a concentration measuring unit in real time;
and judging whether the gas leakage exists or not based on the fusion of the gas flow and the gas concentration.
Further, the method further comprises: and uploading the detection result of whether the gas leakage exists and/or the gas consumption data and the gas concentration data obtained in real time to an upper computer of the main station.
Still further, the method further comprises: when the detection result is that the gas leakage exists, the control processing unit and/or the upper computer send an alarm reminding signal; when the leakage is serious, a command is sent to the intelligent gas meter to cut off the gas supply electromagnetic valve.
Further, the method further comprises: when detecting that the gas leakage exists, determining the approximate position of the gas leakage point according to the gas flow and the gas concentration: the intelligent gas meter is positioned on the gas inlet side or the gas outlet side of the intelligent gas meter.
Further, the determining whether there is a gas leakage based on the fusion of the gas flow and the gas concentration specifically includes:
q represents the gas flow obtained from the intelligent gas meter in real time, and c represents the gas concentration in the user room of the intelligent gas meter obtained from the concentration measuring unit in real time; judging whether the gas leakage exists according to the sizes of q and c according to the following method:
if c=0, q=0, then there is no gas leakage;
if c=0, 0<q min ≤q≤q max And the duration does not exceed the first threshold, no gas leakage exists; wherein q min 、q max The minimum value and the maximum value of the gas flow when the intelligent gas meter user uses the gas normally are respectively;
if 0<c is less than or equal to LEL and q=0, the leakage risk exists, the time T when the gas concentration reaches LEL is further predicted, if T is less than a second threshold value, gas leakage exists, and the leakage point is positioned on the gas inlet side of the intelligent gas meter; wherein LEL is the minimum concentration of the fuel gas that causes explosion;
if 0 is<c≤LEL，0<q≤q min The leakage risk exists, the time T when the gas concentration reaches LEL is further predicted, if T is smaller than a second threshold value, gas leakage exists, and a leakage point is positioned on the gas outlet side of the intelligent gas meter;
if 0 is<c≤LEL，q min ≤q≤q max The gas leakage exists, and the leakage point is positioned on the gas outlet side of the intelligent gas meter;
if c > LEL, q=0, then there is gas leakage, and the leakage point is located on the gas inlet side of the intelligent gas meter;
if c>LEL，q min ≤q≤q max The gas leakage exists, and the leakage point is positioned on the gas outlet side of the intelligent gas meter;
if c>LEL，q>q max Then there is gas leakage and the leakage point is located intelligent gas table air-out side.
Further, the fuel gas concentration prediction method includes:
based on conservation of the mass of the gas in the room, the method comprises the following steps:
wherein t is time, V is room volume, c is gas concentration in the room, q x K is the ventilation times of the room per hour, which is the gas leakage rate;
solving a differential equation taking c as a variable according to the formula (1) to obtain a prediction model of the gas concentration:
wherein, c 0 For initial gas concentration, q x Gas concentration utilization least square method based on multiple historical momentsFitting to obtain the final product.
In a second aspect, the present invention provides a gas leakage detection device based on an intelligent gas meter and a concentration sensor, comprising:
the flow acquisition module is used for acquiring the gas flow from the intelligent gas meter in real time;
the concentration acquisition module is used for acquiring the concentration of the fuel gas from the concentration measurement unit in real time;
and the leakage judging module is used for judging whether the gas leakage exists or not based on the fusion of the gas flow and the gas concentration.
Further, the device also comprises a data uploading module for uploading the detection result of whether the gas leakage exists and/or the gas consumption data and the gas concentration data obtained in real time to an upper computer of the main station.
Further, the device also comprises an alarm module, wherein the alarm module is used for sending an alarm reminding signal by the control processing unit and/or the upper computer when the detection result shows that the gas leakage exists; when the leakage is serious, a command is sent to the intelligent gas meter to cut off the gas supply electromagnetic valve.
Further, the device also comprises a leakage positioning module, which is used for determining the approximate position of the gas leakage point according to the gas flow and the gas concentration when the gas leakage is detected to exist: the intelligent gas meter is positioned on the gas inlet side or the gas outlet side of the intelligent gas meter.
Further, the determining whether there is a gas leakage based on the fusion of the gas flow and the gas concentration specifically includes:
q represents the gas flow obtained from the intelligent gas meter in real time, and c represents the gas concentration in the user room of the intelligent gas meter obtained from the concentration measuring unit in real time; judging whether the gas leakage exists according to the sizes of q and c according to the following method:
if c=0, q=0, then there is no gas leakage;
if c=0, 0<q min ≤q≤q max And the duration does not exceed the first threshold, no gas leakage exists; wherein q min 、q max Respectively, the gas flow rates of the intelligent gas meter when the user uses the gas normallyMinimum and maximum values;
if 0<c is less than or equal to LEL and q=0, the leakage risk exists, the time T when the gas concentration reaches LEL is further predicted, if T is less than a second threshold value, gas leakage exists, and the leakage point is positioned on the gas inlet side of the intelligent gas meter; wherein LEL is the minimum concentration of the fuel gas that causes explosion;
if 0 is<c≤LEL，0<q≤q min The leakage risk exists, the time T when the gas concentration reaches LEL is further predicted, if T is smaller than a second threshold value, gas leakage exists, and a leakage point is positioned on the gas outlet side of the intelligent gas meter;
if 0 is<c≤LEL，q min ≤q≤q max The gas leakage exists, and the leakage point is positioned on the gas outlet side of the intelligent gas meter;
if c > LEL, q=0, then there is gas leakage, and the leakage point is located on the gas inlet side of the intelligent gas meter;
if c>LEL，q min ≤q≤q max The gas leakage exists, and the leakage point is positioned on the gas outlet side of the intelligent gas meter;
if c>LEL，q>q max Then there is gas leakage and the leakage point is located intelligent gas table air-out side.
Further, the fuel gas concentration prediction method includes:
based on conservation of the mass of the gas in the room, the method comprises the following steps:
wherein t is time, V is room volume, c is gas concentration in the room, q x K is the ventilation times of the room per hour, which is the gas leakage rate;
solving a differential equation taking c as a variable according to the formula (1) to obtain a prediction model of the gas concentration:
wherein, c 0 For initial gas concentration, q x Fitting is performed by using a least square method based on the gas concentration at a plurality of historical moments.
Compared with the prior art, the invention has the following beneficial effects.
According to the invention, the gas flow is obtained from the intelligent gas meter in real time, the gas concentration is obtained from the concentration measuring unit in real time, and whether the gas leakage exists or not is judged based on the fusion of the gas flow and the gas concentration, so that the automatic detection of the gas leakage is realized. The invention carries out gas leakage detection based on the fusion of the gas flow obtained from the intelligent gas meter in real time and the gas concentration obtained from the concentration measuring unit in real time, and compared with the prior art, the invention can only effectively detect more obvious leakage by detecting the gas concentration in a single measuring user room, improves the precision of gas leakage detection and the concentration range of gas leakage detection, and especially improves the detection capability of weak gas leakage; the auxiliary judgment of leakage is realized through the fusion detection of the gas meter, and the problems of false alarm and missing alarm of a single alarm mode can be made up to a certain extent.
Drawings
FIG. 1 is a flow chart of a gas leakage detection method based on an intelligent gas meter and a concentration sensor according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a hardware structure of the detection system.
FIG. 3 is a schematic diagram of an indoor gas concentration prediction curve.
Fig. 4 is a block diagram of a gas leakage detection device based on an intelligent gas meter and a concentration sensor according to an embodiment of the invention.
Detailed Description
The present invention will be further described with reference to the drawings and the detailed description below, in order to make the objects, technical solutions and advantages of the present invention more apparent. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a flowchart of a gas leakage detection method based on an intelligent gas meter and a concentration sensor according to an embodiment of the invention, including the following steps:
step 101, acquiring the gas flow from an intelligent gas meter in real time;
102, acquiring the concentration of fuel gas from a concentration measuring unit in real time;
step 103, judging whether the gas leakage exists or not based on the fusion of the gas flow and the gas concentration.
The embodiment provides a gas leakage detection method based on an intelligent gas meter and a concentration sensor. The hardware structure for implementing the method in this embodiment is shown in fig. 2, and includes an intelligent gas meter (including a base meter, a communication module and a control module) installed in a user's home (typically a kitchen), a concentration measurement unit, a control processing unit, and an upper computer of a master station. The base meter of the intelligent gas meter can adopt an ultrasonic gas meter and a diaphragm gas meter. If the ultrasonic gas meter is used as a base meter, the ultrasonic gas meter has the functions of gas flow real-time reading, displaying and transmitting; if a diaphragm gas meter is adopted, the diaphragm gas meter should have a pulse reading function, and the corresponding gas flow is calculated according to the pulse per unit time (the calculation time interval is not more than 1 minute). The intelligent gas meter is provided with a remote communication module which supports communication modes such as NB, 4G, lora and the like; it is preferable to have auxiliary backup communication channels including, but not limited to, bluetooth channels, infrared channels, etc. for after-market maintenance, parameter modification set-up use, or data acquisition and transmission after an abnormality of the primary communication channel (remote communication module). The intelligent gas meter can be in data communication with the control processing unit and can also be interacted with the master station upper computer. The concentration measuring unit mainly comprises a fuel gas concentration sensor, a communication module and the like, and the communication module is used for transmitting fuel gas concentration data to the control processing unit. . The control processing unit is used for judging whether the gas leakage exists or not by carrying out necessary data processing based on the gas flow and the gas concentration, and alarming when the gas leakage exists, so as to prompt a user of leakage risk. The control processing unit also generally has a display function, and can prompt a user through a screen display.
The present embodiment is realized by executing steps 101 to 103 in the control processing unit. Step 101 is mainly used for acquiring the gas flow from the intelligent gas meter in real time, step 102 is mainly used for acquiring the gas concentration from the concentration measuring unit in real time, and step 103 is mainly used for judging whether gas leakage exists or not based on fusion of the gas flow and the gas concentration. The prior art generally only compares the gas concentration with a set threshold by measuring the gas concentration in the user's room, and if the set threshold is exceeded, the gas concentration is considered to be present. This measurement method is feasible when gas leakage is significant; however, when the gas leakage is weak, it is difficult to perform effective detection, because the threshold value needs to be set low to detect the very weak leakage, but when the threshold value is low, a high false alarm probability is generated, that is, a lot of noise or interference signals are misreported as the existence of the gas leakage. Therefore, the embodiment synthesizes the gas flow of the intelligent gas meter obtained in real time and the gas concentration obtained in real time to judge the gas leakage, thereby improving the detection precision and the detection concentration range of the gas leakage.
As an alternative embodiment, the method further comprises: and uploading the detection result of whether the gas leakage exists and/or the gas consumption data and the gas concentration data obtained in real time to an upper computer of the main station.
In this embodiment, the control processing unit further uploads the detection result of the gas leakage to the upper computer of the main station, so that the main station monitors the safe gas consumption condition of the user in real time, and if necessary, takes corresponding measures. The control processing unit of the embodiment can also upload the gas consumption data and the gas concentration data obtained in real time to an upper computer of the main station, and the upper computer performs gas leakage judgment according to necessary data processing. That is, the gas leakage determination may be realized by the control processing unit or by an upper computer of the main station.
As an alternative embodiment, the method further comprises: when the detection result is that the gas leakage exists, the control processing unit and/or the upper computer send an alarm reminding signal; when the leakage is serious, a command is sent to the intelligent gas meter to cut off the gas supply electromagnetic valve.
In the embodiment, when detecting that the gas leakage exists, an alarm prompt signal is sent to remind a user to take necessary precautionary measures; when the leakage is serious, an instruction is sent to the intelligent gas meter, and the intelligent gas meter directly cuts off the gas supply electromagnetic valve according to the instruction so as to avoid danger. After receiving the alarm prompt signal, the upper computer reminds the operator on duty to take corresponding measures according to the leakage degree of the fuel gas, for example, the operator is arranged to go to the field for overhauling, etc. The alarm prompting signal can adopt sound and light alarm and voice alarm, and can also simultaneously carry out text prompt on a display.
As an alternative embodiment, the method further comprises: when detecting that the gas leakage exists, determining the approximate position of the gas leakage point according to the gas flow and the gas concentration: the intelligent gas meter is positioned on the gas inlet side or the gas outlet side of the intelligent gas meter.
In this embodiment, in addition to detecting whether there is a gas leak, the approximate location of the gas leak point is determined when the presence of a gas leak is detected. The outline position of the gas leakage point is relative to the intelligent gas meter, and is positioned on the air inlet side (also called as front of the gas meter) of the intelligent gas meter or on the air outlet side (also called as rear of the gas meter) of the intelligent gas meter. The approximate position can be determined according to the magnitude of the gas flow relative to the normal value of the gas flow: if the leakage point is behind the intelligent gas meter, the gas flow is larger than the normal value; if the leak is in front of the intelligent gas meter, the gas flow will be less than normal. The outline position of the leakage point is provided, so that the leakage point can be conveniently checked by a user or an maintainer.
As an optional embodiment, the determining whether there is a gas leak based on the fusion of the gas flow and the gas concentration specifically includes:
q represents the gas flow obtained from the intelligent gas meter in real time, and c represents the gas concentration in the user room of the intelligent gas meter obtained from the concentration measuring unit in real time; judging whether the gas leakage exists according to the sizes of q and c according to the following method:
if c=0, q=0, then there is no gas leakage;
if c=0, 0<q min ≤q≤q max And hold onIf the duration time does not exceed the first threshold value, no gas leakage exists; wherein q min 、q max The minimum value and the maximum value of the gas flow when the intelligent gas meter user uses the gas normally are respectively;
if 0<c is less than or equal to LEL and q=0, the leakage risk exists, the time T when the gas concentration reaches LEL is further predicted, if T is less than a second threshold value, gas leakage exists, and the leakage point is positioned on the gas inlet side of the intelligent gas meter; wherein LEL is the minimum concentration of the fuel gas that causes explosion;
if 0 is<c≤LEL，0<q≤q min The leakage risk exists, the time T when the gas concentration reaches LEL is further predicted, if T is smaller than a second threshold value, gas leakage exists, and a leakage point is positioned on the gas outlet side of the intelligent gas meter;
if 0 is<c≤LEL，q min ≤q≤q max The gas leakage exists, and the leakage point is positioned on the gas outlet side of the intelligent gas meter;
if c > LEL, q=0, then there is gas leakage, and the leakage point is located on the gas inlet side of the intelligent gas meter;
if c>LEL，q min ≤q≤q max The gas leakage exists, and the leakage point is positioned on the gas outlet side of the intelligent gas meter;
if c>LEL，q>q max Then there is gas leakage and the leakage point is located intelligent gas table air-out side.
The embodiment provides a specific technical scheme for judging whether the gas leakage exists or not. For convenience of description, q is used to represent gas flow, and c is used to represent gas concentration; and then respectively giving out the gas leakage conditions of 8 combinations corresponding to q and c, wherein the 1-8 combinations are arranged in order from small to large according to the leakage degree, no leakage exists in the combinations 1 and 2, small leakage exists in the combinations 3, 4 and 5, and large or even serious leakage exists in the combinations 6, 7 and 8. The following describes the detection results of 8 combinations, respectively.
Combination 1: c=0, and q=0; results: there is no gas leakage and no useful gas.
Combination 2: c=0, and 0<q min ≤q≤q max For a duration of not more than the firstA threshold value; results: no gas leakage exists, and the user uses the gas normally. Wherein q min 、q max The minimum and maximum gas flow rates when the intelligent gas meter user is using normal gas can be obtained by counting the gas flow rates for several consecutive days (such as 15 days). The first threshold may be determined based on a maximum value of the normal air time, such as 2 hours.
Combination 3:0<c is less than or equal to LEL, and q=0; results: there is a risk of leakage and further confirmation is required. And predicting the time T when the gas concentration reaches LEL, if T is smaller than a second threshold value, gas leakage exists, and the leakage point is positioned on the gas inlet side of the intelligent gas meter. Where LEL is the minimum concentration of the gas that causes the explosion. The second threshold is determined empirically, e.g., may be selected for 24 hours.
Combination 4:0<c is less than or equal to LEL and 0<q≤q min As a result: there is a risk of leakage and further confirmation is required. And predicting the time T when the gas concentration reaches LEL, if T is smaller than a second threshold value, gas leakage exists, and the leakage point is positioned on the gas outlet side of the intelligent gas meter.
Combination 5:0<c is less than or equal to LEL and q min ≤q≤q max The method comprises the steps of carrying out a first treatment on the surface of the Results: there is gas leakage, and the leak point is located intelligent gas table air outlet side.
Combination 6: c > LEL, and q=0; results: there is a more severe gas leak and the leak point is located on the gas inlet side of the intelligent gas meter.
Combination 7: c>LEL, and q min ≤q≤q max The method comprises the steps of carrying out a first treatment on the surface of the Results: there is a more severe gas leak and the leak point is located on the gas outlet side of the intelligent gas meter. This situation typically requires controlling the intelligent gas meter to directly shut off the gas valve.
Combination 8: c>0, and q>q max The method comprises the steps of carrying out a first treatment on the surface of the Results: there is a more severe gas leak and the leak point is located on the gas outlet side of the intelligent gas meter. This also requires direct shut-off of the gas valve.
As an alternative embodiment, the fuel gas concentration prediction method includes:
based on conservation of the mass of the gas in the room, the method comprises the following steps:
wherein t is time, V is room volume, c is gas concentration in the room, q x K is the ventilation times of the room per hour, which is the gas leakage rate;
solving a differential equation taking c as a variable according to the formula (1) to obtain a prediction model of the gas concentration:
wherein, c 0 For initial gas concentration, q x Fitting is performed by using a least square method based on the gas concentration at a plurality of historical moments.
The embodiment provides a technical scheme for predicting the concentration of the fuel gas. First, equations including gas concentration, gas leakage rate, time, etc. are listed according to the principle of conservation of gas mass in a user room, as in (1). (1) Where k is the number of ventilation of the room per hour, typically 0.5<k<2.5. To simplify the calculation, k, q x Considering the constant, solving the differential equation of the formula (1) to obtain a prediction model of the gas concentration, see the formula (2), wherein q x The value of (2) can be obtained by fitting based on the gas concentration at a plurality of historic times by using a least square method. According to the formula (2), the gas concentration c at different moments T can be obtained, and the time T corresponding to any c can be obtained through inverse solution, for example, the time T when the gas concentration reaches LEL. The acquisition time interval and the number of data points n may be selected empirically. Fig. 3 shows a schematic view of an indoor gas concentration prediction curve, wherein the ordinate is the gas concentration given in volume fraction.
Fig. 4 is a schematic diagram of a gas leakage detection device based on an intelligent gas meter and a concentration sensor according to an embodiment of the present invention, where the device includes:
the flow acquisition module 11 is used for acquiring the gas flow from the intelligent gas meter in real time;
a concentration acquisition module 12 for acquiring the gas concentration from the concentration measurement unit in real time;
a leakage determination module 13 for determining whether there is a gas leakage based on the fusion of the gas flow and the gas concentration.
The device of this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 1, and its implementation principle and technical effects are similar, and are not described here again. As well as the latter embodiments, will not be explained again.
As an optional embodiment, the device further includes a data uploading module, configured to upload, to an upper computer of the central office, a detection result of whether there is a gas leakage and/or gas consumption data and gas concentration data obtained in real time.
As an optional embodiment, the device further comprises an alarm module, and the alarm module is used for sending an alarm reminding signal by the control processing unit and/or the upper computer when the detection result is that the gas leakage exists; when the leakage is serious, a command is sent to the intelligent gas meter to cut off the gas supply electromagnetic valve.
As an alternative embodiment, the device further comprises a leakage positioning module, configured to determine, when the presence of the gas leakage is detected, a schematic position of the gas leakage point according to the gas flow and the gas concentration: the intelligent gas meter is positioned on the gas inlet side or the gas outlet side of the intelligent gas meter.
As an optional embodiment, the determining whether there is a gas leak based on the fusion of the gas flow and the gas concentration specifically includes:
q represents the gas flow obtained from the intelligent gas meter in real time, and c represents the gas concentration in the user room of the intelligent gas meter obtained from the concentration measuring unit in real time; judging whether the gas leakage exists according to the sizes of q and c according to the following method:
if c=0, q=0, then there is no gas leakage;
if c=0, 0<q min ≤q≤q max And the duration does not exceed the first threshold, no gas leakage exists; wherein q min 、q max The minimum value and the maximum value of the gas flow when the intelligent gas meter user uses the gas normally are respectively;
if 0<c is less than or equal to LEL and q=0, the leakage risk exists, the time T when the gas concentration reaches LEL is further predicted, if T is less than a second threshold value, gas leakage exists, and the leakage point is positioned on the gas inlet side of the intelligent gas meter; wherein LEL is the minimum concentration of the fuel gas that causes explosion;
if 0 is<c≤LEL，0<q≤q min The leakage risk exists, the time T when the gas concentration reaches LEL is further predicted, if T is smaller than a second threshold value, gas leakage exists, and a leakage point is positioned on the gas outlet side of the intelligent gas meter;
if 0 is<c≤LEL，q min ≤q≤q max The gas leakage exists, and the leakage point is positioned on the gas outlet side of the intelligent gas meter;
if c > LEL, q=0, then there is gas leakage, and the leakage point is located on the gas inlet side of the intelligent gas meter;
if c>LEL，q min ≤q≤q max The gas leakage exists, and the leakage point is positioned on the gas outlet side of the intelligent gas meter;
if c>LEL，q>q max Then there is gas leakage and the leakage point is located intelligent gas table air-out side.
As an alternative embodiment, the fuel gas concentration prediction method includes:
based on conservation of the mass of the gas in the room, the method comprises the following steps:
wherein t is time, V is room volume, c is gas concentration in the room, q x K is the ventilation times of the room per hour, which is the gas leakage rate;
solving a differential equation taking c as a variable according to the formula (1) to obtain a prediction model of the gas concentration:
wherein, c 0 For initial gas concentration, q x Gas concentration utilization minimum based on multiple historical momentsFitting by a square method to obtain the product.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. The gas leakage detection method based on the intelligent gas meter and the concentration sensor is characterized by comprising the following steps of:
acquiring the gas flow from the intelligent gas meter in real time;
acquiring the concentration of the fuel gas from a concentration measuring unit in real time;
and judging whether the gas leakage exists or not based on the fusion of the gas flow and the gas concentration.
2. The method for gas leak detection of an intelligent gas meter and concentration sensor of claim 1, further comprising: and uploading the detection result of whether the gas leakage exists and/or the gas consumption data and the gas concentration data obtained in real time to an upper computer of the main station.
3. The method for gas leak detection of an intelligent gas meter and concentration sensor of claim 2, further comprising: when the detection result is that the gas leakage exists, the control processing unit and/or the upper computer send an alarm reminding signal; when the leakage is serious, a command is sent to the intelligent gas meter to cut off the gas supply electromagnetic valve.
4. The method for gas leak detection of an intelligent gas meter and concentration sensor of claim 1, further comprising: when detecting that the gas leakage exists, determining the approximate position of the gas leakage point according to the gas flow and the gas concentration: the intelligent gas meter is positioned on the gas inlet side or the gas outlet side of the intelligent gas meter.
5. The gas leakage detection method of the intelligent gas meter and the concentration sensor according to claim 4, wherein the determining whether the gas leakage exists based on the fusion of the gas flow and the gas concentration specifically comprises:
q represents the gas flow obtained from the intelligent gas meter in real time, and c represents the gas concentration in the user room of the intelligent gas meter obtained from the concentration measuring unit in real time; judging whether the gas leakage exists according to the sizes of q and c according to the following method:
if c=0, q=0, then there is no gas leakage;
if c=0, 0<q min ≤q≤q max And the duration does not exceed the first threshold, no gas leakage exists; wherein q min 、q max The minimum value and the maximum value of the gas flow when the intelligent gas meter user uses the gas normally are respectively;
if 0<c is less than or equal to LEL and q=0, the leakage risk exists, the time T when the gas concentration reaches LEL is further predicted, if T is less than a second threshold value, gas leakage exists, and the leakage point is positioned on the gas inlet side of the intelligent gas meter; wherein LEL is the minimum concentration of the fuel gas that causes explosion;
if 0 is<c≤LEL，0<q≤q min The leakage risk exists, the time T when the gas concentration reaches LEL is further predicted, if T is smaller than a second threshold value, gas leakage exists, and a leakage point is positioned on the gas outlet side of the intelligent gas meter;
if 0 is<c≤LEL，q min ≤q≤q max The gas leakage exists, and the leakage point is positioned on the gas outlet side of the intelligent gas meter;
if c > LEL, q=0, then there is gas leakage, and the leakage point is located on the gas inlet side of the intelligent gas meter;
if c>LEL，q min ≤q≤q max The gas leakage exists, and the leakage point is positioned on the gas outlet side of the intelligent gas meter;
if c>LEL，q>q max Then there is gas leakage and the leakage point is located intelligent gas table air-out side.
6. The gas leakage detection method of an intelligent gas meter and a concentration sensor according to claim 5, wherein the gas concentration prediction method comprises:
based on conservation of the mass of the gas in the room, the method comprises the following steps:
wherein t is time, V is room volume, c is gas concentration in the room, q x K is the ventilation times of the room per hour, which is the gas leakage rate;
solving a differential equation taking c as a variable according to the formula (1) to obtain a prediction model of the gas concentration:
wherein, c 0 For initial gas concentration, q x Fitting is performed by using a least square method based on the gas concentration at a plurality of historical moments.
7. Gas leakage detection device based on intelligent gas table and concentration sensor, its characterized in that includes:
the flow acquisition module is used for acquiring the gas flow from the intelligent gas meter in real time;
the concentration acquisition module is used for acquiring the concentration of the fuel gas from the concentration measurement unit in real time;
and the leakage judging module is used for judging whether the gas leakage exists or not based on the fusion of the gas flow and the gas concentration.
8. The intelligent gas meter and concentration sensor gas leak detection apparatus of claim 7, further comprising a leak location module for determining a gas leak location profile based on the gas flow and gas concentration when a gas leak is detected to be present: the intelligent gas meter is positioned on the gas inlet side or the gas outlet side of the intelligent gas meter.
9. The gas leakage detection device of the intelligent gas meter and the concentration sensor according to claim 8, wherein the determining whether there is a gas leakage based on the fusion of the gas flow and the gas concentration specifically comprises:
q represents the gas flow obtained from the intelligent gas meter in real time, and c represents the gas concentration in the user room of the intelligent gas meter obtained from the concentration measuring unit in real time; judging whether the gas leakage exists according to the sizes of q and c according to the following method:
if c=0, q=0, then there is no gas leakage;
if c=0, 0<q min ≤q≤q max And the duration does not exceed the first threshold, no gas leakage exists; wherein q min 、q max The minimum value and the maximum value of the gas flow when the intelligent gas meter user uses the gas normally are respectively;
if 0<c is less than or equal to LEL and q=0, the leakage risk exists, the time T when the gas concentration reaches LEL is further predicted, if T is less than a second threshold value, gas leakage exists, and the leakage point is positioned on the gas inlet side of the intelligent gas meter; wherein LEL is the minimum concentration of the fuel gas that causes explosion;
if 0 is<c≤LEL，0<q≤q min The leakage risk exists, the time T when the gas concentration reaches LEL is further predicted, if T is smaller than a second threshold value, gas leakage exists, and a leakage point is positioned on the gas outlet side of the intelligent gas meter;
if 0 is<c≤LEL，q min ≤q≤q max The gas leakage exists, and the leakage point is positioned on the gas outlet side of the intelligent gas meter;
if c > LEL, q=0, then there is gas leakage, and the leakage point is located on the gas inlet side of the intelligent gas meter;
if c>LEL，q min ≤q≤q max The gas leakage exists, and the leakage point is positioned on the gas outlet side of the intelligent gas meter;
if c>LEL，q>q max If gas leakage exists, the leakage point is positioned in the intelligent gas meterAnd the air outlet side.
10. The gas leakage detection device of an intelligent gas meter and a concentration sensor according to claim 9, wherein the gas concentration prediction method comprises:
based on conservation of the mass of the gas in the room, the method comprises the following steps:
wherein t is time, V is room volume, c is gas concentration in the room, q x K is the ventilation times of the room per hour, which is the gas leakage rate;
solving a differential equation taking c as a variable according to the formula (1) to obtain a prediction model of the gas concentration:
wherein, c 0 For initial gas concentration, q x Fitting is performed by using a least square method based on the gas concentration at a plurality of historical moments.
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| CN117270404A (en) * | 2023-11-23 | 2023-12-22 | 苏州安极能互联科技有限公司 | Fine control system and method for energy supply in multi-tenant scene |
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| CN117270404A (en) * | 2023-11-23 | 2023-12-22 | 苏州安极能互联科技有限公司 | Fine control system and method for energy supply in multi-tenant scene |
| CN117270404B (en) * | 2023-11-23 | 2024-02-02 | 苏州安极能互联科技有限公司 | Fine control system and method for energy supply in multi-tenant scene |
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