CN107555388B - Device, method, equipment and monitoring system for detecting hydraulic resistance of oil gas recovery pipeline - Google Patents
Device, method, equipment and monitoring system for detecting hydraulic resistance of oil gas recovery pipeline Download PDFInfo
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- CN107555388B CN107555388B CN201710892201.0A CN201710892201A CN107555388B CN 107555388 B CN107555388 B CN 107555388B CN 201710892201 A CN201710892201 A CN 201710892201A CN 107555388 B CN107555388 B CN 107555388B
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- 238000011084 recovery Methods 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012544 monitoring process Methods 0.000 title claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 173
- 230000004044 response Effects 0.000 claims abstract description 17
- 239000003344 environmental pollutant Substances 0.000 claims description 12
- 231100000719 pollutant Toxicity 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 77
- 238000001514 detection method Methods 0.000 abstract description 13
- 239000002828 fuel tank Substances 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 185
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 33
- 229930195733 hydrocarbon Natural products 0.000 description 24
- 239000004215 Carbon black (E152) Substances 0.000 description 23
- 150000002430 hydrocarbons Chemical class 0.000 description 23
- 229910052757 nitrogen Inorganic materials 0.000 description 16
- 230000006870 function Effects 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003502 gasoline Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 125000001183 hydrocarbyl group Chemical group 0.000 description 1
- 238000012417 linear regression Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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Abstract
The invention relates to detection of oil gas recovery pipeline liquid resistance, in particular to a device, a method and equipment for detecting oil gas recovery pipeline liquid resistance and an online monitoring system. An apparatus for detecting hydraulic resistance of an oil and gas recovery line, wherein the oil and gas recovery line is communicated between a fuel dispenser and a fuel tank, and further comprising: a processor, and a memory for storing at least one computer code configured to, when executed on the processor, cause the processor to: acquiring the flow rate of sucked oil gas and the corresponding relative liquid resistance of the oiling machine during the oiling operation according to the set frequency; calculating effective absolute liquid resistance according to the relative liquid resistance; judging whether the effective absolute liquid resistance exceeds a preset threshold value or not, and recording the times that the effective absolute liquid resistance exceeds the preset threshold value in a preset early warning period; and generating a signal which causes the early warning to be sent out in response to the recorded number of times that the effective absolute liquid resistance exceeds the preset threshold value in the preset early warning period exceeding the early warning threshold value.
Description
Technical Field
The invention relates to detection of oil gas recovery pipeline liquid resistance, in particular to a device for detecting oil gas recovery pipeline liquid resistance, a method for detecting oil gas recovery pipeline liquid resistance, equipment for detecting oil gas recovery pipeline liquid resistance and an oil gas recovery on-line monitoring system of a gas station.
Background
"liquid resistance" generally refers to the resistance of a condensate to the retention of the gas in a hydrocarbon line or the passage of gas through the line for other reasons. In the detection of the liquid resistance of the oil gas recovery pipeline in the prior art, manual detection is often required by using nitrogen, for example, a detector needs to use the nitrogen in a nitrogen cylinder, and a detection port specially reserved is filled with the nitrogen according to a certain flow rate, so that whether the corresponding liquid resistance is in a normal range is detected. Such detection requires special tools (nitrogen cylinders, regulating valves, etc.), and the filling station cannot perform the filling operation at the time of detection, which causes inconvenience in detection. The liquid resistance detection in the prior art also generally needs to be detected after emptying, thus causing oil gas waste and environmental pollution.
Thus, there is an urgent need in the art for improved detection of hydraulic resistance in oil and gas recovery pipelines.
Disclosure of Invention
According to a first aspect of the present invention, there is provided an apparatus for detecting hydraulic resistance of a vapor recovery line communicating between a fuel dispenser and a fuel tank, the apparatus may comprise:
a processor, and
a memory for storing at least one computer code configured to, when executed on the processor, cause the processor to:
Acquiring the flow rate of sucked oil gas and the corresponding relative liquid resistance of the oiling machine during the oiling operation according to the set frequency;
calculating an effective absolute liquid resistance according to the relative liquid resistance;
judging whether the effective absolute liquid resistance exceeds a preset threshold value or not, and recording the times that the effective absolute liquid resistance exceeds the preset threshold value in a preset early warning period;
and generating a signal for causing an early warning to be sent out in response to the recorded number of times the effective absolute liquid resistance exceeds the predetermined threshold in a predetermined early warning period exceeding an early warning threshold.
In one embodiment of the present invention, wherein obtaining the suction oil and gas flow rate and corresponding relative hydraulic resistance of the fuel dispenser during a fueling operation based on the set frequency comprises:
the flow rate of sucked oil gas and the corresponding relative liquid resistance during the period when the oiling machine at the farthest position from the oil tank is in oiling operation and the other oiling machines at the next farthest position from the oil tank are in stopping oiling operation are obtained according to the set frequency.
In another embodiment of the invention, the processor is further configured to record a number of consecutive occurrences of the alert and to generate a signal that causes an alert to be issued in response to the number of consecutive occurrences of the alert exceeding an alert threshold.
In yet another embodiment of the present invention, wherein the set frequency comprises a first set frequency for acquiring a flow rate of the suction oil and gas every 10-60000 ms, and the set frequency further comprises a second set frequency for acquiring a corresponding relative liquid resistance every 1-120 seconds, the predetermined pre-warning period range comprises within 12-120 hours, the pre-warning threshold range comprises 10% -90% of the total number of times the predetermined pre-warning period is exceeded in the predetermined pre-warning period, and the warning threshold range comprises within 24-720 hours.
In yet another embodiment of the present invention, wherein the first set frequency comprises an intake oil and gas flow rate taken every 300 milliseconds, the second set frequency comprises a relative liquid resistance taken every 10 seconds, the predetermined pre-warning period range comprises less than 24 hours, the pre-warning threshold range comprises 25% of the total number of times the predetermined pre-warning period is exceeded in the predetermined pre-warning period, and the warning threshold range comprises 120 hours.
In one embodiment of the invention, wherein the predetermined threshold is set according to table 1 in the national standard of the people's republic of China GB20952-2007 for gas station atmospheric pollutant emission standards or according to table 2 in the local standard of beijing DB11/208-2010 for gas station oil and gas emission control and restriction standards.
According to a second aspect of the present invention, there is provided a method for detecting hydraulic resistance of an oil and gas recovery line, which may comprise the steps of:
acquiring the flow rate of sucked oil gas and the corresponding relative liquid resistance of the oiling machine during the oiling operation according to the set frequency;
calculating an effective absolute liquid resistance according to the relative liquid resistance;
judging whether the effective absolute liquid resistance exceeds a preset threshold value or not, and recording the times that the effective absolute liquid resistance exceeds the preset threshold value in a preset early warning period;
And generating a signal for causing an early warning to be sent out in response to the recorded number of times the effective absolute liquid resistance exceeds the predetermined threshold in a predetermined early warning period exceeding an early warning threshold.
In one embodiment of the present invention, wherein the step of obtaining the suction oil and gas flow rate and corresponding relative hydraulic resistance of the fuel dispenser during a fueling operation based on the set frequency may comprise:
the flow rate of sucked oil gas and the corresponding relative liquid resistance during the period when the oiling machine at the farthest position from the oil tank is in oiling operation and the other oiling machines at the next farthest position from the oil tank are in stopping oiling operation are obtained according to the set frequency.
In another embodiment of the present invention, the method for detecting the hydraulic resistance of the oil and gas recovery line may further comprise the steps of:
recording the number of continuous occurrence times of the early warning, and generating a signal for causing an alarm to be sent out in response to the number of continuous occurrence times of the early warning exceeding an alarm threshold.
In yet another embodiment of the present invention, wherein the set frequency comprises a first set frequency for acquiring a flow rate of the suction oil and gas every 10-60000 ms, and the set frequency further comprises a second set frequency for acquiring a corresponding relative liquid resistance every 1-120 seconds, the predetermined pre-warning period range comprises within 12-120 hours, the pre-warning threshold range comprises 10% -90% of the total number of times the predetermined pre-warning period is exceeded in the predetermined pre-warning period, and the warning threshold range comprises within 24-720 hours.
In yet another embodiment of the present invention, wherein the first set frequency comprises an intake oil and gas flow rate taken every 300 milliseconds, the second set frequency comprises a relative liquid resistance taken every 10 seconds, the predetermined pre-warning period range comprises less than 24 hours, the pre-warning threshold range comprises 25% of the total number of times the predetermined pre-warning period is exceeded in the predetermined pre-warning period, and the warning threshold range comprises 120 hours.
In another embodiment of the invention, wherein the predetermined threshold is set according to table 1 in the national standard of the people's republic of China GB20952-2007 for gas station atmospheric pollutant emission standards or according to table 2 in the local standard of beijing DB11/208-2010 for gas station oil and gas emission control and restriction standards.
According to a third aspect of the present invention there is provided an apparatus for detecting hydraulic resistance of an oil and gas recovery line, which may comprise:
the acquisition unit is used for acquiring the flow rate of sucked oil gas and the corresponding relative liquid resistance of the oiling machine during the oiling operation according to the set frequency;
a calculating unit for calculating an effective absolute liquid resistance according to the relative liquid resistance;
a determining unit for determining whether the effective absolute liquid resistance exceeds a predetermined threshold value, and recording the number of times the effective absolute liquid resistance exceeds the predetermined threshold value in a predetermined early warning period;
And the warning unit is used for generating a signal for causing the early warning to be sent out in response to the recorded times that the effective absolute liquid resistance exceeds the preset threshold value in the preset early warning period exceeds the early warning threshold value.
In one embodiment of the invention, wherein the acquiring unit further acquires, based on the set frequency, an intake air flow rate and a corresponding relative hydraulic resistance during a refueling operation of the fuel dispenser at a position farthest from the tank and a refueling operation of the other fuel dispenser at a position next farthest from the tank.
In another embodiment of the present invention, the determining unit further records the number of continuous occurrences of the early warning, and instructs the warning unit to issue a signal of the warning when the number of continuous occurrences of the early warning exceeds the warning threshold.
In yet another embodiment of the present invention, wherein the set frequency comprises a first set frequency for acquiring a flow rate of the suction oil and gas every 10-60000 ms, and the set frequency further comprises a second set frequency for acquiring a corresponding relative liquid resistance every 1-120 seconds, the predetermined pre-warning period range comprises within 12-120 hours, the pre-warning threshold range comprises 10% -90% of the total number of times the predetermined pre-warning period is exceeded in the predetermined pre-warning period, and the warning threshold range comprises within 24-720 hours.
In yet another embodiment of the present invention, wherein the first set frequency comprises an intake oil and gas flow rate taken every 300 milliseconds, the second set frequency comprises a relative liquid resistance taken every 10 seconds, the predetermined pre-warning period range comprises less than 24 hours, the pre-warning threshold range comprises 25% of the total number of times the predetermined pre-warning period is exceeded in the predetermined pre-warning period, and the warning threshold range comprises 120 hours.
In one embodiment of the invention, wherein the predetermined threshold is set according to table 1 in the national standard of the people's republic of China GB20952-2007 for gas station atmospheric pollutant emission standards or according to table 2 in the local standard of beijing DB11/208-2010 for gas station oil and gas emission control and restriction standards.
According to a fourth aspect of the present invention, there is provided an on-line monitoring system for oil and gas recovery at a gas station, which may comprise the above-mentioned device for detecting the liquid resistance of the oil and gas recovery line, or the above-mentioned method for detecting the liquid resistance of the oil and gas recovery line, or the above-mentioned apparatus for detecting the liquid resistance of the oil and gas recovery line.
By means of the device for detecting the liquid resistance of the oil gas recovery pipeline and the method for detecting the liquid resistance of the oil gas recovery pipeline, the equipment for detecting the liquid resistance of the oil gas recovery pipeline and the oil gas recovery on-line monitoring system of the gas station, real-time on-line detection can be performed under the condition that a nitrogen cylinder, nitrogen and the like are omitted and normal oiling operation of the oiling machine is not affected, and great convenience is provided for operators and management staff.
Drawings
FIG. 1 schematically illustrates an apparatus for detecting hydraulic resistance of an oil and gas recovery line according to a first aspect of the present invention;
FIG. 2 schematically illustrates a method for detecting oil and gas recovery line hydraulic resistance according to a second aspect of the invention;
fig. 3 schematically shows an apparatus for detecting hydraulic resistance of an oil and gas recovery line according to a third aspect of the invention.
Fig. 4 schematically shows a straight line which the inventors fit the data given in table 1 in the national standard for the people's republic of China, GB20952-2007, in relation to the emission standard of atmospheric pollutants at gas stations.
Detailed Description
Various embodiments of the present invention are described in detail below with reference to the attached drawing figures.
Fig. 1 schematically illustrates an apparatus 10 for detecting hydraulic resistance of an oil and gas recovery line according to a first aspect of the invention, which may include: an oil tank 11, in which fuel 17 such as gasoline, diesel oil, or the like can be stored in the oil tank 11; a first oiling machine 1 nearest to the oil tank 11; a second oiling machine 2 positioned next closest to the oil tank 11; a third oiling machine 3 located farthest from the oil tank 11; a first oil and gas recovery line 4 for connecting the oil tank 11 with the first fuel dispenser 1; a second oil and gas recovery line 5 for connecting the oil tank 11 with the second fuel dispenser 2; a third oil and gas recovery line 6 for connecting the oil tank 11 with the third fuel dispenser 1; wherein the oil tank 11, the first oiling machine 1, the second oiling machine 2, the third oiling machine 3, the first oil gas recovery pipeline 4, the second oil gas recovery pipeline 5 and the third oil gas recovery pipeline 6 form a closed system. It will be appreciated by those skilled in the art that the first oil and gas recovery line 4, the second oil and gas recovery line 5, and the third oil and gas recovery line 6 are actually arranged in parallel or not in parallel with the delivery line for delivering fuel 17 to the fuel dispenser connected to the fuel dispenser during the refueling operation, which are well known in the art and will not be described herein.
As mentioned above, the tank 11 may store therein fuel 17 such as gasoline, diesel, or the like. Since a plurality of volatile additives are added to the fuel 17 to enhance the combustion characteristics of the fuel or to meet the corresponding environmental standards, there is a certain oil pressure in the closed system formed by the oil tank 11, the first oiling machine 1, the second oiling machine 2, the third oiling machine 3, and the corresponding first oil gas recovery line 4, second oil gas recovery line 5, and third oil gas recovery line 6. These oil and gas 16 include volatilized fuel gas, additives, etc., and these oil and gas 16 and the fuel in the tank 11 constitute a saturated system. As will be readily appreciated by those skilled in the art.
The first fuel dispenser 1, the second fuel dispenser 2, the third fuel dispenser 3 shown in fig. 1 are only schematic, and do not mean that there are only three fuel dispensers at a gas station, and in fact there may be several fuel dispensers at a gas station, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9 fuel dispensers, etc. … …, and each fuel dispenser may be provided with several fuel dispensers, for example, 1, 2, 3, 4 fuel dispensers, etc. … ….
In addition, the apparatus 10 for detecting vapor recovery line flow resistance according to one embodiment of the present invention shown in FIG. 1 may also include vapor flow sensors 12e, 12f located in the first fuel dispenser 1 for detecting the suction vapor flow rate of the first fuel dispenser 1 during a fueling operation. The device 10 for detecting the hydraulic resistance of the oil and gas recovery line may further comprise a first hydraulic resistance sensor 9 located below the first fuel dispenser 1 for detecting the hydraulic resistance pressure in the first oil and gas recovery line 4, i.e. the line pressure of the first fuel dispenser 1 to the tank 11. Similarly, the device 10 for detecting hydraulic resistance of the vapor recovery line may also include vapor flow sensors 12c, 12d located in the second fuel dispenser 2 for detecting the vapor suction flow rate of the second fuel dispenser 2 during a fueling operation. The means 10 for detecting hydraulic resistance of the oil and gas recovery line may further comprise a second hydraulic resistance sensor 8 located below the second fuel dispenser 2 for detecting hydraulic resistance pressure in the second oil and gas recovery line 5. Similarly, the means 10 for detecting the hydraulic resistance of the oil and gas recovery line may further comprise oil and gas flow sensors 12a, 12b located in the third fuel dispenser 3 for detecting the suction oil and gas flow rate of the third fuel dispenser 3 during the refueling operation. The device 10 for detecting hydraulic resistance of the oil and gas recovery line may further comprise a third hydraulic resistance sensor 7 located below the third fuel dispenser 3 for detecting hydraulic resistance pressure in the third oil and gas recovery line 6. In the example shown in fig. 1, the oil and gas flow sensors 12a, 12b, 12c, 12d and the second and third liquid resistance sensors 8, 7 are all directly or indirectly connected to the memory 13, for example by wire or wirelessly, and although the connection lines between the oil and gas flow sensors 12e, 12f and the first liquid resistance sensor 9 and the memory 13 are not shown in fig. 1, that is merely for the sake of simplicity of the drawing, in fact, in the case of using the oil and gas flow sensors 12e, 12f and the first liquid resistance sensor 9, the oil and gas flow sensors 12e, 12f and the first liquid resistance sensor 9 are also directly or indirectly connected to the memory 13, for example by wire or wirelessly.
It should also be noted that in one embodiment of the present invention, the oil and gas flow sensors 12c, 12d located in the second fuel dispenser 2 and the second hydraulic resistance sensor 8 located below the second fuel dispenser 2; and the oil and gas flow rate sensors 12e, 12f located in the first fuel dispenser 1 and the first liquid resistance sensor 9 located below the first fuel dispenser 1 are not essential, and may even be omitted, for example, the oil and gas flow rate sensors 12a, 12b may be arranged only in the third fuel dispenser 3 at the farthest position from the tank 11, and the third liquid resistance sensor 7 may be arranged below the third fuel dispenser 3, the oil and gas flow rate sensors 12a, 12b being used to detect the suction oil and gas flow rate of the third fuel dispenser 3 during the refueling operation, the corresponding time, and the third liquid resistance sensor 7 being used to detect the relative liquid resistance. This is done by transmitting these data to the memory 13 after the real-time intake air flow rate, the corresponding time, and the relative hydraulic resistance detected by the third hydraulic resistance sensor 7 using the air flow sensors 12a, 12b, as will be described in more detail later.
As already mentioned above, the device 10 for detecting the hydraulic resistance of a hydrocarbon recovery line according to one embodiment of the invention may further comprise a memory 13 for storing the hydrocarbon flow rate (or more precisely the hydrocarbon flow rate, the units of experimental data of hydrocarbon flow rates given below are essentially all units of hydrocarbon flow rate, e.g. L/min) and the corresponding time detected by the hydrocarbon flow rate sensors 12a, 12b, and for storing the relative hydraulic resistance detected by the third hydraulic resistance sensor 7. In the case of using the oil and gas flow rate sensors 12c, 12d and the second hydraulic resistance sensor 8 located below the second fuel dispenser 2, the memory 13 may also store the oil and gas flow rates detected by the oil and gas flow rate sensors 12c, 12d and the corresponding times, and store the relative hydraulic resistance detected by the second hydraulic resistance sensor 8. Similarly, where the hydrocarbon flow rate sensors 12e, 12f and the first hydraulic resistance sensor 9 located below the first fuel dispenser 1 are used, the memory 13 may also store the hydrocarbon flow rate and corresponding time detected by the hydrocarbon flow rate sensors 12e, 12f and store the relative hydraulic resistance detected by the first hydraulic resistance sensor 9. It should be noted that, in fact, in order to determine whether there is a need for an effective absolute hydraulic resistance exceeding a predetermined threshold, it is sufficient to use only the oil and gas flow sensors 12a, 12b and the third hydraulic resistance sensor 7 to detect the corresponding data, respectively, and in this case the oil and gas flow sensors 12c, 12d and the second hydraulic resistance sensor 8 located below the second fuel dispenser 2 may not be used; it is also possible to dispense with the use of the oil and gas flow sensors 12e, 12f and the first hydraulic resistance sensor 9 located below the first fuel dispenser 1. It is sometimes desirable to use oil and gas flow sensors 12c, 12d and a second hydraulic resistance sensor 8 located below the second fuel dispenser 2; and the oil and gas flow rate sensors 12e, 12f and the first hydraulic resistance sensor 9 located below the first fuel dispenser 1, further determines, only in the case where it is determined that the effective absolute hydraulic resistance has exceeded a predetermined threshold value and the effective absolute hydraulic resistance exceeds the predetermined threshold value for a predetermined warning period of time, the number of times that the predetermined threshold value is exceeded, thereby issuing a warning signal, where the effective absolute hydraulic resistance exceeds the predetermined threshold value. However, as the device 10 for detecting the hydraulic resistance of the oil and gas recovery line, the object of the present invention has been achieved by detecting the corresponding data using only the oil and gas flow rate sensors 12a, 12b and the third hydraulic resistance sensor 7, respectively, as for the oil and gas flow rate sensors 12c, 12d and the second hydraulic resistance sensor 8 located below the second fuel dispenser 2; and the oil and gas flow sensors 12e, 12f and the first hydraulic resistance sensor 9 located below the first fuel dispenser 1 are only matters that need to be considered after the objects of the present invention are achieved. Therefore, the following will explain in detail mainly in connection with the case where the oil and gas flow rate sensors 12a and/or 12b and the third hydraulic resistance sensor 7 are used to detect the respective data, respectively, for the use of the oil and gas flow rate sensors 12c, 12d and the second hydraulic resistance sensor 8 located below the second fuel dispenser 2; and the use of the oil and gas flow sensors 12e, 12f and the first hydraulic resistance sensor 9 located below the first fuel dispenser 1, the logical principle of which is similar to that of the oil and gas flow sensors 12a, 12b and the third hydraulic resistance sensor 7, and the former is not the invention point and will not be described in detail.
It should also be noted that while two fuel flow sensors 12a, 12b are shown in fig. 1 as being installed in the third fuel dispenser 3, in one embodiment of the present invention, only one fuel dispenser 12a or 12b need be used in the case of a fueling operation in the third fuel dispenser 3, and two flow sensors 12a, 12b need not be used, and here fig. 1 illustrates two flow sensors 12a, 12b only for the purpose of considering that fuel flow sensors are installed on both the left and right sides of the third fuel dispenser 3. It should be clear here that in the case of detecting hydraulic resistance, the data detected are valid only in the case where any one of the fuel guns is in the fueling operation and none of the other fuel guns is in the fueling operation, so that only one oil and gas flow sensor is required at this time. The description will be focused on the use of the oil and gas flow sensor 12a, and the case of using the oil and gas flow sensor 12b is similar to the case of using the oil and gas flow sensor 12a, and will not be repeated for the sake of brevity.
It is noted that these flow rates of hydrocarbons and corresponding times detected by the hydrocarbon flow sensor 12a, and the relative resistances of fluids and corresponding times detected by the third resistance sensor 7 may be stored in the memory 13 in the form of computer code. It will be appreciated by those skilled in the art that many existing hydrocarbon flow sensors also have the function of storing data that would be transferred to memory 13 in the event that a large amount of data would need to be stored.
In one embodiment, the apparatus 10 for detecting vapor recovery line liquid resistance may further comprise a processor 14, and the computer code may be configured to, when executed on the processor 14, cause the processor 14 to obtain, from a set frequency, a suction vapor flow rate and a corresponding relative liquid resistance of the fuel dispenser during a fueling operation; calculating an effective absolute liquid resistance according to the relative liquid resistance; judging whether the effective absolute liquid resistance exceeds a preset threshold value or not, and recording the times that the effective absolute liquid resistance exceeds the preset threshold value in a preset early warning period; and generating a signal for causing an early warning to be sent out in response to the recorded number of times the effective absolute liquid resistance exceeds the predetermined threshold in a predetermined early warning period exceeding an early warning threshold.
With regard to the above-mentioned processor 14 "acquiring the suction oil flow rate and the corresponding relative liquid resistance during the oiling operation of the oiling machine according to the set frequency", it is to be noted that, for example, in a period of 1 day or 24 hours, there are a plurality of operating intervals in which the third oiling machine 3 located farthest from the oil tank 11 is in the oiling operation and the other oiling machines located farthest from the oil tank 11, for example, the first oiling machine 1, the second oiling machine 2 are in the stopping oiling operation, in which the processor 6 can acquire the suction oil flow rate, the corresponding times and the corresponding relative liquid resistance during the stopping oiling operation of the oiling machines located farthest from the oil tank and the other oiling machines located farthest from the oil tank, for example, the first oiling machine 1, the second oiling machine 2, according to the set frequency. Since the fueling operations of the third fueling machine 3, the first fueling machine 1, and the second fueling machine 2 are performed randomly at the time of actual fueling, there is a possibility that the case where the fueling operation is performed by the third fueling machine 3 and the fueling operation is performed by either the first fueling machine 1, the second fueling machine 2, or both the first fueling machine 1 and the second fueling machine 2, the intake air flow rate and the corresponding relative liquid resistance value obtained in this case are not considered (invalid values), and only the intake air flow rate, the corresponding time, and the corresponding relative liquid resistance value obtained at the operating gap where the third fueling machine 3 located farthest from the tank 11 is in the fueling operation and the other fueling machines located farthest from the tank 11, for example, the first fueling machine 1 and the second fueling machine 2 are in the stopped fueling operation, are required values. As for the frequency of acquisition, for example, the suction oil and gas flow rate is acquired every 10 to 60000 ms or every 300 ms according to the first set frequency. The method of acquiring the flow rate of the sucked oil gas can adopt a polling or active uploading method. For example, the processor 6 may poll every 10-60000 milliseconds to store in the memory 13 the value of the suction flow rate at the location of the third fuel dispenser 3 as detected by the flow sensor 12a and the corresponding time. Alternatively, the third fuel dispenser 3 location fuel flow sensor 12a may actively upload and store in memory 13 every 10-60000 milliseconds its sensed suction fuel flow rate value and corresponding time.
The set frequencies may include a first set frequency for acquiring the suction oil flow rate every 10-60000 ms and a second set frequency for acquiring the corresponding relative hydraulic resistance every 1-120 seconds, so that the suction oil flow rate, the corresponding time, and the corresponding relative hydraulic resistance are achieved during the stop of the refueling operation from the third refueling machine 3 located farthest from the tank 11 while the second refueling machine 2 located farthest from the tank 11, the first refueling machine 1 located closest to the tank 11, without affecting the operation of the refueling machines. The first and second set frequencies so fast described above ensure the purpose of real-time continuous detection and monitoring.
The above-mentioned "calculating the effective absolute liquid resistance from the relative liquid resistance" is to be noted that the processor 14 may calculate the value of the effective absolute liquid resistance from the value of the relative liquid resistance. This is because, for example, when the third liquid resistance sensor 7 measures a liquid resistance value, there is a certain amount of oil gas between the third oil gas recovery line 6 and the oil tank 11, and thus a certain amount of air pressure must exist between the third oil gas recovery line 6 and the oil tank 11, so that the liquid resistance value measured by the third liquid resistance sensor 7 at this time actually includes the original oil gas pressure existing between the third oil gas recovery line 6 and the oil tank 11 and is not actually reflected in the liquid resistance at the position of the third liquid resistance sensor 7, so that the measured liquid resistance at this time may be referred to as relative liquid resistance. In order to better reflect the actual liquid resistance at the position of the third liquid resistance sensor 7, namely, the effective absolute liquid resistance, the actual measured relative liquid resistance of the third liquid resistance sensor 7 needs to be subtracted from the original oil gas pressure between the third oil gas recovery pipeline 6 and the oil tank 11 at the moment in the calculation process, so that the effective absolute liquid resistance value truly reflecting the liquid resistance condition at the position of the third liquid resistance sensor 7 can be obtained. As to how the original oil gas pressure existing between the third oil gas recovery line 6 and the oil tank 11 at a specific point in time is measured, it can be obtained by means of a sensor 15 coupled to the oil tank 11, such as a barometric sensor or a differential pressure sensor commonly used in the art, for continuously detecting the oil gas pressure inside the oil tank 11. The memory 13 may also store the hydrocarbon pressure detected by the sensor 15 and the corresponding time. These hydrocarbon pressures and corresponding times may be stored on the memory 13 in the form of computer code. Although the connection between the sensor 15 and the memory 13 is not shown in fig. 1, that is merely for the sake of simplicity of the drawing, in practice the connection between the sensor 15 and the memory 13 is direct or indirect, for example by means of a wired or wireless connection. It will be appreciated by those skilled in the art that many existing sensors also have the function of storing data, which will be transferred to and stored in the memory 13 in the event that a large amount of data needs to be stored.
With respect to "calculating the effective absolute hydraulic resistance from the relative hydraulic resistance", alternatively, in one embodiment of the present invention, for example, a HZD YZ-Sensor hydraulic resistance Sensor (for example, at the position of the third hydraulic resistance Sensor 7) may be installed on the third oil and gas recovery line 6 of the third fuel dispenser 3 at the farthest end from the fuel tank 11 alone, and the HZD YZ-Sensor hydraulic resistance Sensor monitors the hydraulic resistance condition of the third oil and gas recovery line 6 in real time. When the third fuel dispenser 3 (the HZD YZ-Sensor liquid resistance Sensor is installed on the third oil and gas recovery line 6) located at the farthest position from the fuel tank 11 performs the fuel filling operation, and the other fuel dispensers located at the farthest position from the fuel tank 11, such as the first fuel dispenser 1 and the second fuel dispenser 2, do not perform the fuel filling operation, the HZD YZ-Sensor liquid resistance Sensor is triggered to measure the relative liquid resistance in the third oil and gas recovery line 6 at fixed intervals (i.e., the second set frequency mentioned above), and the relative liquid resistance is uploaded to, for example, the HZD UC-4 environmental monitoring data conversion unit (not shown) which is equivalent to the memory 13 and the processor 14 shown in fig. 1) and screens out these relative liquid resistance values, and eliminates unreasonable values, such as those detected negative relative liquid resistance values, which need to be eliminated; in addition, for particularly high relative liquid resistance values, such as values between 500 Pa and 1000Pa in the effective period, there is a relative liquid resistance value of 2000Pa or even higher, and the obviously high value is unreasonable, and is removed, so that the reasonable relative liquid resistance is finally screened out. Since the pressure in the third oil recovery line 6 is constantly changing during the actual filling of the third fuel dispenser 3, a reasonable relative hydraulic resistance here is the corrected relative hydraulic resistance obtained after the extreme values have been deleted. The effective absolute hydraulic resistance is obtained by subtracting the corrected relative hydraulic resistance from the value of the pressure in the third oil and gas recovery line 6 at that time, which, as already mentioned above, is detected by means of a sensor 15 connected to the oil tank 11. Because the pressure value in the third oil-gas recovery line 6 detected by the sensor 15 and the corresponding time are transmitted to the memory 13, and the relative liquid resistance detected by the third liquid resistance sensor 7 and the corresponding time, and the oil-gas flow rate detected by the oil-gas flow sensor 12a and the corresponding time are transmitted to the memory 13, the processor 14 can classify the oil-gas flow rate detected by the oil-gas flow sensor 12a, the relative liquid resistance detected by the third liquid resistance sensor 7 and the pressure value in the third oil-gas recovery line 6 detected by the sensor 15 according to the time sequence, and a numerical table is generated. For example, if the value of the flow rate of oil gas detected by the oil gas flow sensor 12a obtained at time t1 is 10L/min, the relative liquid resistance detected by the third liquid resistance sensor 7 is 600Pa, and the value of the pressure in the third oil gas recovery line 6 detected by the sensor 15 is 580Pa, the processor 14 classifies the value obtained at time t1 as the same column. Similarly, if the value of the oil gas flow rate detected by the oil gas flow sensor 12a obtained at the time t2 is 18L/min, the relative liquid resistance detected by the third liquid resistance sensor 7 is 700Pa, and the pressure value in the third oil gas recovery pipeline 6 detected by the sensor 15 is 670Pa, the processor 14 classifies the value obtained at the time t2 as the same column. Similarly, if the value of the flow rate of oil gas detected by the oil gas flow sensor 12a obtained at time t3 is 28L/min, the relative liquid resistance detected by the third liquid resistance sensor 7 is 800Pa, and the pressure value in the third oil gas recovery line 6 detected by the sensor 15 is 650Pa, the processor 14 classifies the value obtained at time t3 as the same column … ….
Based on the above-classified data, the processor 14 will obtain the oil and gas flow rate value of 10L/min at time t1 and the corresponding effective absolute hydraulic resistance of 20Pa (the relative hydraulic resistance detected by the third hydraulic resistance sensor 7 is 600 Pa-the pressure value in the third oil and gas recovery line 6 detected by the sensor 15 is 580 Pa). Similarly, the processor 14 will obtain the oil and gas flow rate value 18L/min at time t2 and the corresponding effective absolute hydraulic resistance 30Pa (the relative hydraulic resistance detected by the third hydraulic resistance sensor 7 is 700 Pa-the pressure value 670Pa in the third oil and gas recovery line 6 detected by the sensor 15). Similarly, the processor 14 will obtain the oil and gas flow rate value 28L/min at time t3 and the corresponding effective absolute hydraulic resistance 50Pa (relative hydraulic resistance 800Pa detected by the third hydraulic resistance sensor 7-pressure 650Pa in the third oil recovery line 6 detected by the sensor 15) ….
The processor 14 may determine whether the effective absolute liquid resistance exceeds a predetermined threshold and record the number of times the effective absolute liquid resistance exceeds the predetermined threshold during a predetermined pre-warning period. The predetermined threshold values mentioned in the various embodiments of the present invention may be set according to table 1 in the national standard of the people's republic of China GB20952-2007 on the standards of emission of atmospheric pollutants from gas stations or according to table 2 in the local standard of the beijing city DB11/208-2010 on the standards of emission control and restriction of oil and gas from gas stations. But may be set according to other local standards, such as Tianjin, shanghai, etc., as will be readily appreciated by those skilled in the art. And if the recorded number of times that the effective absolute liquid resistance exceeds the preset threshold value in the preset early warning period exceeds the early warning threshold value, generating a signal for causing early warning to be sent. For example, the pre-warning threshold range includes 10% -90% of the total number of times that the pre-warning threshold is exceeded in the pre-warning period. The processor 14 is further configured to generate a signal causing an early warning to be issued in response to the recorded number of times the effective absolute hydraulic resistance exceeds the predetermined threshold in a predetermined early warning period exceeding an early warning threshold.
The above-mentioned set frequency may include a first set frequency for acquiring a flow rate of the sucked oil gas every 10 to 60000 ms, and the set frequency may further include a second set frequency for acquiring a corresponding relative liquid resistance every 1 to 120 seconds, the predetermined early warning period range may include within 12 to 120 hours, the early warning threshold range may include 10% to 90% of the number of times the predetermined threshold is exceeded in the predetermined early warning period, and the alarm threshold range may include within 24 to 720 hours.
Alternatively, the first set frequency comprises acquiring the suction oil gas flow rate every 300 milliseconds, the second set frequency comprises acquiring the relative liquid resistance every 10 seconds, the preset early warning period range comprises less than 24 hours, the number of times of exceeding the preset threshold value in the preset early warning period accounts for 25% of the total number of times of exceeding the preset early warning period, and the alarm threshold value range comprises 120 hours.
Regarding the predetermined threshold, it should be noted that, for example, table 1 in the national standard for gas station atmospheric pollutant emission in the republic of China, GB20952-2007, gives the maximum pressure limit value of the gas station oil and gas recovery line liquid resistance, for example, when the flow rate of the introduced nitrogen is 18.0L/min, the corresponding maximum pressure (liquid resistance) is 40Pa; when the flow rate of the introduced nitrogen is 28.0L/min, the corresponding maximum pressure is 90Pa; at a nitrogen flow rate of 38.0L/min, the corresponding maximum pressure was 155Pa. The inventors of the present invention devised a method of setting a predetermined threshold value in advance by referring to the numerical values specified in the above-mentioned standards. The invention has the advantages that nitrogen is not used in all the embodiments, the flow rate of the introduced nitrogen, which is specified in national standard of the people's republic of China, GB20952-2007, can be replaced by the flow rate of the sucked oil gas, because the flow rate of the sucked oil gas used in all the embodiments of the invention is the same as the flow rate of the introduced nitrogen used in the prior art, and the flow rate of the introduced nitrogen passes through the same pipeline, the liquid resistance is detected while the gas is introduced, but the nitrogen is introduced while the liquid resistance is detected to exceed the standard in the prior art, and in all the embodiments of the invention, the suction oil gas is sucked while the liquid resistance is detected to exceed the standard, so that the purpose of real-time online monitoring can be realized. It should also be noted that the inventors noted that the flow rate of the introduced nitrogen gas, as specified in the national standard of the people's republic of China, GB20952-2007, was substantially linear with the corresponding maximum pressure, and based on this finding, the inventors fit the data given in Table 1 of the national standard of the people's republic of China, GB20952-2007, with respect to the discharge standard of the atmospheric pollutants at the gas station, into a straight line, as shown in FIG. 4. For example, the suction oil and gas flow rate used in the embodiment of the present invention is on the abscissa, and the maximum pressure (maximum effective absolute hydraulic resistance) is on the ordinate, and from such a straight line, a predetermined threshold value corresponding to the specific suction oil and gas flow rate at any specific time t can be obtained, thereby determining whether the effective absolute hydraulic resistance at any specific time t exceeds the predetermined threshold value. For example, the predetermined threshold corresponding to a particular suction hydrocarbon flow rate 18 at a particular time t1 is 40Pa; the predetermined threshold corresponding to a particular suction hydrocarbon flow rate 28 at a particular time t2 is 90Pa; the predetermined threshold corresponding to a particular suction hydrocarbon flow rate 38 at a particular time t3 is 155Pa … …. The predetermined threshold given above is set with reference to the national standard of the people's republic of China, GB20952-2007, which is also different for different national or regional standards, as will be appreciated by those skilled in the art.
It should be noted that, in fig. 4, a linear regression equation is made with 3 suction oil gas flow rates (X) and the corresponding maximum effective absolute liquid resistance (Y), so as to obtain the following formula:
y=5.75x-66 (formula 1)
Table 1 below lists a comparison between the suction oil and gas flow rate (X) calculated according to equation 1 and the corresponding equation calculated value (Y) and the maximum effective absolute liquid resistance (Pa) set with reference to the national standard of the people's republic of China, GB20952-2007, it being seen that the equation calculated value (Y) calculated according to equation 1 substantially conforms to the limit values prescribed by the national standard of the national standard, GB20952-2007 with respect to liquid resistance.
TABLE 1
It is to be noted that, for example, assuming that the effective absolute hydraulic resistance corresponding to the suction oil and gas flow rate 18 is 50Pa (50 Pa > 40 Pa) at time t1 in one embodiment of the present invention, the effective absolute hydraulic resistance at time t1 is considered to exceed the predetermined threshold; assuming that in one embodiment of the invention the effective absolute hydraulic resistance at time t1 corresponding to the suction hydrocarbon flow rate 18 is 30Pa (30 Pa < 40 Pa), then the effective absolute hydraulic resistance at time t1 is considered not to exceed the predetermined threshold. Similarly, assuming that in one embodiment of the invention the effective absolute hydraulic resistance corresponding to the suction hydrocarbon flow rate 28 at time t2 is 100Pa (100 Pa > 90 Pa), then the effective absolute hydraulic resistance at time t2 is considered to exceed the predetermined threshold; assuming that in one embodiment of the invention the effective absolute hydraulic resistance at time t2 corresponding to the suction hydrocarbon flow rate 28 is 80Pa (80 Pa < 90 Pa), then the effective absolute hydraulic resistance at time t2 is considered not to exceed the predetermined threshold. Similarly, assuming that in one embodiment of the invention the effective absolute hydraulic resistance corresponding to the suction hydrocarbon flow rate 38 at time t3 is 160Pa (160 Pa > 155 Pa), then the effective absolute hydraulic resistance at time t3 is considered to exceed the predetermined threshold; assuming that in one embodiment of the invention the effective absolute hydraulic resistance at time t3 corresponding to the suction hydrocarbon flow rate 38 is 150Pa (150 Pa < 155 Pa), then the effective absolute hydraulic resistance at time t3 is considered not to exceed the predetermined threshold. Likewise, the effective absolute hydraulic resistance corresponding to the square of the specific suction oil and gas flow rate at any other time may be compared with a predetermined threshold value at any other time obtained by the above straight line to determine whether the corresponding predetermined threshold value is exceeded.
If the processor 14 determines that the effective absolute liquid resistance at a particular time t exceeds a predetermined threshold, the processor 14 also records the number of times the effective absolute liquid resistance exceeded the predetermined threshold in a predetermined pre-warning period, and continues to determine whether the number of times the effective absolute liquid resistance recorded so far exceeded the predetermined threshold in a predetermined pre-warning period (e.g., 24 hours) exceeded the pre-warning threshold. The processor 14 may instruct the alarm device 17 to issue an early warning signal, for example when the number of times that said predetermined threshold is exceeded exceeds an early warning threshold of a total number of times in for example 24 hours. This early warning threshold range may be 20% -30%. For example, processor 14 determines to start from 0:00 minutes of the day to 24:00 the last minute is over, the number of times exceeding the predetermined threshold value is 40% of the total number of determinations in one day (24 hours), and the processor 14 instructs the alarm device 17 to issue an early warning signal. If processor 14 determines to start from 0:00 minutes of day to 24: and when the last minute of 00 is finished, the number of times exceeding the preset threshold value accounts for 15% of the total judgment times in one day (24 hours), and no early warning signal is sent out.
The processor 14 is further configured to record the number of successive occurrences of the alert and generate a signal that causes an alert to be issued in response to the number of successive occurrences of the alert exceeding the alert threshold. For example, when an early warning has occurred for 5 consecutive days (e.g., 120 hours), the processor 14 generates a signal that causes an alarm to be raised, assuming that the alarm threshold is exceeded.
The above has been given as a schematic description, and in each of the ranges given by the present invention, for example, the set frequency (first set frequency and second set frequency) range, the predetermined early-warning period range, the early-warning threshold range, the alarm threshold range, and the like, the person skilled in the art may make corresponding selections in accordance with these ranges in combination with specific reality.
The device for detecting the hydraulic resistance of the oil and gas recovery line has been described in detail above. Other aspects of the present invention will be generally described below, and for brevity, the description of the parts repeated above will not be repeated.
A method 20 for detecting oil and gas recovery line hydraulic resistance is shown in fig. 2, and may include the steps of: step 21, acquiring the flow rate of sucked oil gas and the corresponding relative liquid resistance of the oiling machine during the oiling operation according to the set frequency; step 22, calculating effective absolute liquid resistance according to the relative liquid resistance; step 23, judging whether the effective absolute liquid resistance exceeds a preset threshold value, and recording the times that the effective absolute liquid resistance exceeds the preset threshold value in a preset early warning period; and step 24, generating a signal for causing the early warning to be sent out in response to the recorded times of the effective absolute liquid resistance exceeding the preset threshold value in the preset early warning period exceeding the early warning threshold value.
Alternatively, the method 20 for detecting the hydraulic resistance of an oil and gas recovery line further comprises the steps of: and step 25, recording the number of continuous occurrence times of the early warning, and generating a signal for causing an alarm to be sent in response to the number of continuous occurrence times of the early warning exceeding an alarm threshold.
Alternatively, step 21, wherein the intake air flow rate and the corresponding relative hydraulic resistance of the fuel dispenser during the fueling operation are obtained from the set frequency, may further comprise: the flow rate of sucked oil gas and the corresponding relative liquid resistance during the period when the oiling machine at the farthest position from the oil tank is in oiling operation and the other oiling machines at the next farthest position from the oil tank are in stopping oiling operation are obtained according to the set frequency.
As already mentioned above, wherein the set frequency comprises a first set frequency for acquiring the flow rate of the inhaled hydrocarbon every 10-60000 ms, and the set frequency further comprises a second set frequency for acquiring the corresponding relative liquid resistance every 1-120 seconds, the predetermined pre-warning period range comprises within 12-120 hours, the pre-warning threshold range comprises 10% -90% of the total number of times the predetermined threshold is exceeded in the predetermined pre-warning period, and the warning threshold range comprises within 24-720 hours. Alternatively wherein the first set frequency comprises acquiring the suction oil and gas flow rate every 300 milliseconds, the second set frequency comprises acquiring the relative liquid resistance every 10 seconds, the predetermined early warning period range comprises less than 24 hours, the early warning threshold range comprises 25% of the total exceeding times in the predetermined early warning period in the number of times exceeding the predetermined threshold in the predetermined early warning period, and the early warning threshold range comprises 120 hours.
Alternatively, wherein the predetermined threshold is set according to table 1 in the national standard of the people's republic of China GB20952-2007 for gas station atmospheric pollutant emission standards or according to table 2 in the local standard of beijing DB11/208-2010 for gas station oil and gas emission control and restriction standards.
Fig. 3 schematically illustrates an apparatus 30 for detecting hydraulic resistance of an oil and gas recovery line, which may include: an obtaining unit 31 for obtaining the flow rate of sucked oil gas and the corresponding relative liquid resistance of the oiling machine during the oiling operation according to the set frequency; a calculation unit 32 for calculating an effective absolute liquid resistance from the relative liquid resistance; a determining unit 33 for determining whether the effective absolute liquid resistance exceeds a predetermined threshold, and recording the number of times the effective absolute liquid resistance exceeds the predetermined threshold in a predetermined early-warning period; and the warning unit 34 is used for generating a signal for causing the sending of the early warning in response to the recorded times that the effective absolute liquid resistance exceeds the preset threshold value in the preset early warning period exceeds the early warning threshold value.
Alternatively, the acquisition unit 31 also acquires, from the set frequency, the suction oil flow rate and the corresponding relative hydraulic resistance during the refueling operation of the fuel dispenser at the position farthest from the tank and the rest of the fuel dispensers at the positions next farthest from the tank.
Alternatively, the determination unit 33 also records the number of successive occurrences of the early warning, and instructs the warning unit 34 to issue a signal of warning when the number of successive occurrences of the early warning exceeds the warning threshold.
Also, wherein the set frequency comprises a first set frequency for acquiring the flow rate of the sucked oil gas every 10-60000 milliseconds, and the set frequency further comprises a second set frequency for acquiring the corresponding relative liquid resistance every 1-120 seconds, the predetermined early warning period range comprises within 12-120 hours, the early warning threshold range comprises 10% -90% of the total exceeding times in the predetermined early warning period, the early warning threshold range comprises within 24-720 hours. Alternatively, the first set frequency comprises acquiring the suction oil gas flow rate every 300 milliseconds, the second set frequency comprises acquiring the relative liquid resistance every 10 seconds, the preset early warning period range comprises less than 24 hours, the number of times of exceeding the preset threshold value in the preset early warning period accounts for 25% of the total number of times of exceeding the preset early warning period, and the alarm threshold value range comprises 120 hours.
Alternatively, wherein the predetermined threshold is set according to table 1 in the national standard of the people's republic of China GB20952-2007 for gas station atmospheric pollutant emission standards or according to table 2 in the local standard of beijing DB11/208-2010 for gas station oil and gas emission control and restriction standards.
The invention also provides an oil gas recovery on-line monitoring system of a gas station, which comprises the device for detecting the liquid resistance of the oil gas recovery pipeline, or the method for detecting the liquid resistance of the oil gas recovery pipeline, or the device for detecting the liquid resistance of the oil gas recovery pipeline.
By means of the embodiments of the design, under the condition that the refueling operation of the gas station is not required to be stopped, the relative liquid resistance at the corresponding time can be obtained continuously and repeatedly according to the set frequency without using nitrogen, the effective absolute liquid resistance is calculated, and compared with the preset threshold value, the early warning or alarm is sent out under the condition that a certain condition is met. The device has the advantages that the device is convenient to use, avoids the influence on the filling operation of the filling station in the prior art, realizes the online real-time detection of the oil gas recovery system of the filling station, realizes the purpose of automation, and has very high practical value and commercial value.
It should be noted that the term "comprising" as used in the various embodiments of the present invention should not be interpreted as including only, but not limiting in meaning.
In addition, it should be noted that the technical solution proposed in the present invention may be implemented in a software form, may be implemented in a hardware form, or may be implemented by a combination of software and hardware.
In case of an implementation in software form, the acquisition unit, the calculation unit, the determination unit and the warning unit may each be implemented as software modules of the respective functions, such as instructions or instruction sets in the form of computer code.
In the case of a hardware implementation, the acquiring unit, the calculating unit, the determining unit and the warning unit may each be implemented by a hardware device for implementing a corresponding function, for example, an electronic circuit, a logic unit, an application specific integrated circuit, a field programmable gate array, a microprocessor, a digital signal processor, etc. In one embodiment according to the invention, the acquisition unit may be, for example, a pressure detection device, such as a pressure sensor; the calculation unit can be realized by combining a subtracter and a divider, wherein the subtracter is used for obtaining a liquid resistance difference between the relative liquid resistance and the standard liquid resistance, namely obtaining an effective absolute liquid resistance, and the divider is used for dividing the effective absolute liquid resistance obtained by the subtracter by the value of the standard liquid resistance so as to obtain the ratio of the effective absolute liquid resistance and the standard liquid resistance; the decision unit may be realized, for example, by a combination of a comparator that compares the above-mentioned ratio with a predetermined threshold value and a counter that counts the number of times the above-mentioned ratio is larger than the predetermined threshold value; the warning unit may be implemented, for example, by a signal generator, such as a voltage/current signal generator capable of generating a predetermined voltage or current, and when the count value in the counter exceeds a predetermined threshold value, a control signal is provided to the signal generator so that the signal generator generates a signal capable of indicating that an early warning is issued.
In the case of combining software and hardware, a part of the functional operations in the embodiments of the present invention may be implemented in the form of the above-mentioned software modules, and another part of the operations may be implemented in the form of hardware devices, or may be implemented in the form of software modules and hardware devices, respectively, for one functional operation, according to application requirements.
While the invention has been described with reference to the presently contemplated embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. On the contrary, the invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
Claims (10)
1. An apparatus for detecting hydraulic resistance of an oil and gas recovery line, the oil and gas recovery line being in communication between an oil dispenser and an oil tank, the apparatus comprising:
a processor, and
a memory for storing at least one computer code configured to, when executed on the processor, cause the processor to:
acquiring the flow rate of sucked oil gas and corresponding relative liquid resistance during the period that the oiling machine at the farthest position from the oil tank is in oiling operation and the other oiling machines at the next farthest position from the oil tank are in oiling stopping operation according to the set frequency; wherein the oil gas flow rate is detected by an oil gas flow sensor;
Calculating effective absolute liquid resistance according to the relative liquid resistance;
judging whether the effective absolute liquid resistance exceeds a preset threshold value or not, and recording the times that the effective absolute liquid resistance exceeds the preset threshold value in a preset early warning period;
generating a signal causing an early warning to be issued in response to the recorded number of times the effective absolute liquid resistance exceeds the predetermined threshold in a predetermined early warning period exceeding an early warning threshold;
wherein the processor is further configured to record a number of consecutive occurrences of the alert and to generate a signal that causes an alert to be issued in response to the number of consecutive occurrences of the alert exceeding an alert threshold; wherein the method comprises the steps of
The set frequency comprises a first set frequency for acquiring the flow rate of sucked oil gas every 10-60000 milliseconds, the set frequency also comprises a second set frequency for acquiring corresponding relative liquid resistance every 1-120 seconds, the range of the preset early warning time period comprises within 12-120 hours, the number of times of exceeding the preset threshold value in the preset early warning time period accounts for 10-90% of the total number of times of exceeding in the preset early warning time period, and the range of the alarm threshold value comprises 24-720 hours.
2. The apparatus for detecting hydraulic resistance of an oil and gas recovery line of claim 1, wherein the first set frequency comprises an intake oil and gas flow rate acquired every 300 milliseconds, the second set frequency comprises an intake relative hydraulic resistance acquired every 10 seconds, the predetermined warning period range comprises within 24 hours, the warning threshold range comprises 25% of the total number of times the predetermined threshold is exceeded in the predetermined warning period, and the warning threshold range comprises 120 hours.
3. The apparatus for detecting the hydraulic resistance of an oil and gas recovery line according to any one of claims 1 to 2, wherein the predetermined threshold is set according to table 1 in the national standard of the people's republic of china GB20952-2007 on the emission standards of atmospheric pollutants for gas stations or according to table 2 in the local standard of the beijing city DB11/208-2010 on the emission control and restriction standards for gas stations.
4. A method for detecting hydraulic resistance of an oil and gas recovery line, comprising the steps of:
acquiring the sucked oil gas flow rate and corresponding relative liquid resistance during the period that the oiling machine at the farthest position from the oil tank is in oiling operation and the other oiling machines at the next farthest position from the oil tank are in stopping oiling operation according to the set frequency, wherein the oil gas flow rate is detected by an oil gas flow sensor;
calculating effective absolute liquid resistance according to the relative liquid resistance;
judging whether the effective absolute liquid resistance exceeds a preset threshold value or not, and recording the times that the effective absolute liquid resistance exceeds the preset threshold value in a preset early warning period;
generating a signal causing an early warning to be issued in response to the recorded number of times the effective absolute liquid resistance exceeds the predetermined threshold in a predetermined early warning period exceeding an early warning threshold;
Recording the number of continuous occurrence times of early warning, and generating a signal for causing an alarm to be sent out in response to the number of continuous occurrence times of early warning exceeding an alarm threshold; the set frequency comprises a first set frequency for acquiring the flow rate of sucked oil gas every 10-60000 milliseconds, the set frequency also comprises a second set frequency for acquiring corresponding relative liquid resistance every 1-120 seconds, the range of the preset early warning time period comprises within 12-120 hours, the number of times of exceeding the preset threshold value in the preset early warning time period accounts for 10-90% of the total number of times of exceeding in the preset early warning time period, and the range of the alarm threshold value comprises 24-720 hours.
5. The method for detecting hydraulic resistance of an oil and gas recovery line of claim 4, wherein the first set frequency comprises an intake oil and gas flow rate acquired every 300 milliseconds, the second set frequency comprises an acquisition of relative hydraulic resistance every 10 seconds, the predetermined warning period range comprises within 24 hours, the warning threshold range comprises 25% of the total number of times the predetermined threshold is exceeded in the predetermined warning period, and the warning threshold range comprises 120 hours.
6. The method for detecting the hydraulic resistance of an oil and gas recovery line according to any one of claims 4 to 5, wherein the predetermined threshold is set according to table 1 in the national standard of the people's republic of china GB20952-2007 on the emission standards of gas stations for atmospheric pollutants or according to table 2 in the local standard of the beijing city DB11/208-2010 on the emission control and restriction standards of gas stations.
7. An apparatus for detecting hydraulic resistance of an oil and gas recovery line, comprising:
an acquisition unit for acquiring, according to a set frequency, a suction oil gas flow rate and a corresponding relative liquid resistance during a period when the oiling machine at the farthest position from the oil tank is in a oiling operation and the other oiling machines at the next farthest position from the oil tank are in a stopped oiling operation, wherein the oil gas flow rate is detected by an oil gas flow sensor;
the calculating unit is used for calculating effective absolute liquid resistance according to the relative liquid resistance;
a determining unit, configured to determine whether the effective absolute liquid resistance exceeds a predetermined threshold, and record the number of times that the effective absolute liquid resistance exceeds the predetermined threshold in a predetermined early-warning period;
the warning unit is used for generating a signal for causing the sending of a warning in response to the recorded times of the effective absolute liquid resistance exceeding the preset threshold value in the preset warning period exceeding the warning threshold value;
The judging unit also records the number of continuous occurrence times of early warning, and indicates the warning unit to send out a warning signal when the number of continuous occurrence times of early warning exceeds a warning threshold value; the set frequency comprises a first set frequency for acquiring the flow rate of sucked oil gas every 10-60000 milliseconds, the set frequency also comprises a second set frequency for acquiring corresponding relative liquid resistance every 1-120 seconds, the range of the preset early warning time period comprises within 12-120 hours, the number of times of exceeding the preset threshold value in the preset early warning time period accounts for 10-90% of the total number of times of exceeding in the preset early warning time period, and the range of the alarm threshold value comprises 24-720 hours.
8. The apparatus for detecting hydraulic resistance of an oil and gas recovery line according to claim 7, wherein the first set frequency comprises an intake oil and gas flow rate acquired every 300 milliseconds, the second set frequency comprises an intake relative hydraulic resistance acquired every 10 seconds, the predetermined warning period range comprises within 24 hours, the warning threshold range comprises 25% of the total number of times the predetermined threshold is exceeded in the predetermined warning period, and the warning threshold range comprises 120 hours.
9. The apparatus for detecting the hydraulic resistance of an oil and gas recovery line according to any one of claims 7 to 8, wherein the predetermined threshold is set according to table 1 in the national standard of the people's republic of china GB20952-2007 on the emission standards of gas stations for atmospheric pollutants or according to table 2 in the local standard of the beijing city DB11/208-2010 on the emission control and restriction standards of gas stations.
10. A gas station vapour recovery on-line monitoring system comprising a device for detecting vapour recovery line hydraulic resistance according to any of claims 1-3, or a method for detecting vapour recovery line hydraulic resistance according to any of claims 4-6, or an apparatus for detecting vapour recovery line hydraulic resistance according to any of claims 7-9.
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