CN108072498B - Low-temperature gas leakage detection system - Google Patents
Low-temperature gas leakage detection system Download PDFInfo
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- CN108072498B CN108072498B CN201611035415.8A CN201611035415A CN108072498B CN 108072498 B CN108072498 B CN 108072498B CN 201611035415 A CN201611035415 A CN 201611035415A CN 108072498 B CN108072498 B CN 108072498B
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- 238000001514 detection method Methods 0.000 title claims abstract description 84
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- 238000000429 assembly Methods 0.000 claims description 5
- 238000003331 infrared imaging Methods 0.000 abstract description 7
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- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 109
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- 238000010586 diagram Methods 0.000 description 7
- 239000003949 liquefied natural gas Substances 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 7
- 241000196324 Embryophyta Species 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
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- 238000009792 diffusion process Methods 0.000 description 2
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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
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
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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
Abstract
The invention discloses a low-temperature gas leakage detection system, and belongs to the field of medium leakage detection. The low-temperature gas leakage detection system comprises: the device comprises a signal detection component for performing full-field detection on low-temperature gas in a medium field to be detected, operation equipment connected with the signal detection component, and a controller connected with the signal detection component, wherein a storage device for storing the low-temperature gas is arranged in the medium field. According to the invention, the movable signal detection component is arranged in the medium field, so that the signal detection component can detect low-temperature gas in the medium field, and the signal detection component can detect the low-temperature gas as long as the low-temperature gas in the medium field changes, namely the storage equipment leaks, so that the problem that the leaked gas cannot be successfully detected when the leaked medium is detected by utilizing an infrared imaging mode in the related technology is solved; the effect of detecting leakage of low-temperature gas is achieved.
Description
Technical Field
The invention relates to the field of medium leakage detection, in particular to a low-temperature gas leakage detection system.
Background
The leakage hazard of flammable and explosive media such as natural gas is great, especially in chemical plants or gas processing plants, such as liquefied natural gas processing plants and filling stations. In the factory boundary area, dangerous medium leakage points can exist anywhere, namely, important equipment and pipelines can be leaked, non-critical equipment and pipelines can also be leaked, and therefore, how to perform full-scale monitoring on the leaked medium is a problem to be solved.
In full-field monitoring of the leakage medium, infrared imaging methods may be used for leakage monitoring. However, since the properties of the solid and the gas on the emission, reflection, refraction and the like of the infrared spectrum have great differences, the main body of the infrared imaging is the solid surface temperature of various devices, and the leaked gas is difficult to image under the background conditions of various factory devices and pipelines, so that the infrared imaging method cannot detect the leaked and diffused gas, especially the low-temperature gas.
Disclosure of Invention
In order to solve the problem that leaked gas cannot be successfully detected when a leaked medium is detected by utilizing an infrared imaging mode in the related art, the embodiment of the invention provides a low-temperature gas leakage detection system. The technical scheme is as follows:
in a first aspect, a low-temperature gas leakage detection system is provided, the low-temperature gas leakage detection system includes a signal detection assembly for performing full-field detection on low-temperature gas in a medium field to be detected, an operation device connected with the signal detection assembly, and a controller connected with the signal detection assembly, wherein a storage device for storing the low-temperature gas is arranged in the medium field.
The signal detection assembly is arranged in the medium field, so that the signal detection assembly can detect low-temperature gas in the medium field, and the signal detection assembly can detect the low-temperature gas as long as the low-temperature gas in the medium field changes, namely the storage equipment leaks the low-temperature gas, so that the problem that the leaked gas cannot be successfully detected when the leaked medium is detected by utilizing an infrared imaging mode in the related technology is solved; the effect of detecting leakage of low-temperature gas is achieved.
Optionally, the signal detection assembly includes an acoustic transmitter for transmitting an acoustic signal and an acoustic receiver for receiving an acoustic signal; at least one group of sound wave transmitters and sound wave receivers are positioned at opposite positions on the periphery of the dielectric field, and no barrier exists between the sound wave transmitters and the sound wave receivers.
Because each group of sound wave transmitter and sound wave receiver are located the relative position in this medium field periphery, consequently the signal that sound wave transmitter transmitted can pass the medium field when reaching sound wave receiver, when there is low temperature gas of revealing in the medium field, can influence the normal transmission of this signal, according to the delay characteristic that sound wave receiver received this signal, whether there is low temperature gas's revealing in the medium field.
Optionally, at least one of the sonic transmitters or sonic receivers in the signal detection assembly is located within the gas space formed by the detected media field.
Because at least one group of sound wave transmitters or sound wave receivers in the signal detection assemblies are positioned in the gas space formed by the medium field, when the area of the medium field is overlarge or the internal structure of the medium field is too complex, the arrangement of the overhigh signal detection assemblies around the medium field is avoided, and the arrangement of the sound wave transmitters or sound wave receivers in the gas space formed by the medium field can effectively ensure that the distance between the groups of signal detection assemblies is free from barriers, so that the detection accuracy is ensured.
Optionally, the acoustic transmitter or the acoustic receiver located inside the gas space is arranged to be movable such that signals emitted by the acoustic transmitter can reach the acoustic receiver located outside the other distance without obstruction.
Because the positions of the sound wave transmitters or the sound wave receivers are allowed to move, the positions of the sound wave transmitters and the sound wave receivers can be reasonably set by an installer according to the internal structure of the medium field, so that no obstacle exists between each group of sound wave transmitters or sound wave receivers, and the monitoring of a large range and high density is realized.
Optionally, the low-temperature gas leakage detection system further comprises a first upright post for installing an acoustic wave transmitter and a second upright post for installing an acoustic wave receiver; the number of the sound wave receivers arranged on the second upright post opposite to the first upright post is at least two, and the at least two sound wave receivers on the same second upright post are arranged on the second upright post up and down.
Through set up the stand in the periphery of medium field, be provided with the sound wave transmitter on the first stand, be provided with a plurality of sound wave receivers of arranging from top to bottom on the second stand that is opposite with first stand, because there is transmission path between sound wave transmitter and each sound wave receiver, consequently increased the detection of revealing to the low temperature gas of each height and each region in the medium field.
Optionally, for each set of acoustic transmitters and acoustic receivers, the controller is configured to control the acoustic transmitters to transmit acoustic signals; the sound wave receiver is used for receiving the sound wave signal; the computing device is used for calculating the flight time length of the sound wave signal on a transmission path between the sound wave transmitter and the sound wave receiver, and when the change rate of the flight time length on the transmission path is larger than a first threshold value, the low-temperature gas leaked from the storage device is judged to exist on the transmission path.
By calculating the duration of the flight on the transmission path between the acoustic transmitter and the acoustic receiver, when the rate of change of the duration of the flight on the transmission path is greater than a first threshold, it is indicated that there is a sudden gas intervention on the transmission path, and at this time, it can be determined that there is low-temperature gas leaking from the storage device on the transmission path.
Optionally, for each acoustic transmitter, the controller is configured to control the acoustic transmitter to transmit an acoustic signal; each sound wave receiver is used for receiving the sound wave signal; the computing device is used for calculating the flight time length of the sound wave signal on the transmission path between the sound wave transmitter and each sound wave receiver, the obtained projection of each flight time length is utilized to reconstruct the spatial temperature distribution, and when the change rate of the spatial temperature distribution is larger than a second threshold value, the existence of low-temperature gas leaked from the storage device in the medium field is judged.
By calculating the flight time length on the transmission path between the acoustic wave emitter and each acoustic wave receiver, the space temperature distribution is constructed, when the space temperature distribution in different continuous time periods has obvious difference, the sudden gas intervention on the transmission path is indicated, and at the moment, the existence of the low-temperature gas leaked from the storage device on the transmission path can be judged. And because each transmission path extends over the whole medium field, the leakage condition of the low-temperature gas in the medium field can be reflected more accurately according to the spatial temperature distribution.
Optionally, the signal detection assembly includes at least one electromagnetic wave transceiver for emitting electromagnetic waves, the electromagnetic wave transceiver being located at the periphery of the media field or within the media field.
Optionally, the electromagnetic wave transceiver is configured to be movable, so that an installer can adjust the position of the electromagnetic wave transceiver according to the actual structure inside the medium field, so as to ensure that the electromagnetic wave transceiver can receive the reflected electromagnetic wave after emitting the electromagnetic wave.
Optionally, for any one of the electromagnetic wave transceivers, the controller is configured to control the electromagnetic wave transceiver to emit electromagnetic waves into the dielectric field; the operation device is also used for detecting whether the electromagnetic wave transceiver receives the reflected electromagnetic wave, and judging that the low-temperature gas leaked from the storage device exists in the medium field when the electromagnetic wave transceiver receives the reflected electromagnetic wave.
Since water in the air can form water drops to float at low altitude after encountering low-temperature gas, and electromagnetic waves have the characteristic of encountering obstacle reflection, the signal detection assembly is arranged as an electromagnetic wave transceiver, and if the electromagnetic waves reflected by the electromagnetic wave transceiver can be reflected, the water drops floating at low altitude are encountered, and when the weather is clear, the reflected electromagnetic waves mean that the leakage of the low-temperature gas exists in a medium field.
Optionally, the controller is configured to adjust the emission direction of the electromagnetic wave transceiver at predetermined time intervals, the emission direction pointing horizontally into the medium field, and control the electromagnetic wave transceiver after adjusting the emission direction to emit electromagnetic waves.
By adjusting the transmitting direction of the electromagnetic wave transceiver, the detectable area of the electromagnetic wave transceiver is enlarged, and the comprehensiveness of the leakage detection of the low-temperature gas in the medium field is improved.
Optionally, the controller is further configured to obtain the reflected electromagnetic waves corresponding to each emission direction received by the electromagnetic wave transceiver, and determine that the low-temperature gas leaked from the storage device exists in the medium field if the similarity between at least two groups of electromagnetic waves in the reflected electromagnetic waves is greater than a predetermined similarity threshold.
Because the low-temperature gas can diffuse in the medium field after leakage, water drops in the form of moisture in the air are uneven in the medium field, and if the medium field is rainy, snowy and other weather, rainwater and snowflake are generally evenly distributed in the medium field, therefore, if the similarity between at least two groups of electromagnetic waves in the reflected electromagnetic waves is greater than a preset similarity threshold value, the existence of uneven water drops or particle distribution is indicated, at the moment, the existence of the low-temperature gas leaked from the storage device in the medium field can be judged, and the condition that the low-temperature gas leakage can be successfully detected in overcast and rainy weather can be ensured.
Optionally, the low-temperature gas leakage detection system further comprises a display device electrically connected with the operation device, and the display device is used for displaying the detection result output by the operation device.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a low temperature gas leakage detection system according to an embodiment of the present invention;
FIG. 2A is a schematic diagram of a low temperature gas leakage detection system according to an embodiment of the present invention;
FIG. 2B is a schematic diagram of a dielectric field with an acoustic transmitter and an acoustic receiver disposed in accordance with an embodiment of the present invention;
FIG. 2C is a schematic illustration of the diffusion range of an exemplary LNG tank of an LNG liquefaction plant following leakage, provided by an embodiment of the present invention;
FIG. 2D is a schematic diagram of another dielectric field with an acoustic transmitter and an acoustic receiver disposed in accordance with an embodiment of the present invention;
FIG. 3A is a schematic diagram of a low temperature gas leakage detection system according to an embodiment of the present invention;
FIG. 3B is a schematic diagram of a dielectric field with an electromagnetic wave transceiver disposed therein, provided by an embodiment of the present invention;
fig. 3C is a schematic diagram of detecting water droplets using electromagnetic waves provided in an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of a low-temperature gas leakage detection system provided in an embodiment of the present invention, which includes a signal detection assembly 10, an arithmetic device 12, and a controller 14.
The signal detection assembly 10 is used for full-field detection of low-temperature gas in a medium field to be detected.
The computing device 12 is connected to the signal detection assembly 10 and the controller 14 is connected to the signal detection assembly 10, which is herein referred to as an electrical connection or a network connection. The controller 14 may control the signal detection assembly 10 to transmit signals, receive signals, output received signals, etc. For example, the controller 14 may detect the assembly 10 transmitting signals, receiving signals, or outputting received signals, etc., based on a predetermined or indicated timing control signal.
A storage device, such as a tank, for storing the cryogenic gas is provided in the medium field as referred to herein.
Optionally, the low temperature gas leakage detection system may further include a display device 16, where the display device 16 is electrically connected to the computing device 12, and the display device 16 may be used to display the result output by the computing device 12.
In summary, in the low-temperature gas leakage detection system provided by the embodiment of the invention, the signal detection component is arranged in the medium field, so that the signal detection component can detect the low-temperature gas in the medium field, and as long as the low-temperature gas in the medium field changes, namely the storage device leaks the low-temperature gas, the low-temperature gas can be detected by the signal detection component, so that the problem that the leaked gas cannot be successfully detected when the leaked medium is detected by using an infrared imaging mode in the related art is solved; the effect of detecting leakage of low-temperature gas is achieved.
Because the cryogenic gas typically diffuses into the air after leakage, affecting the transmission of sound waves, the present invention may arrange the signal detection assembly 10 to include at least one set of sound wave transmitters and sound wave receivers based on this property of the cryogenic gas.
Referring to fig. 2A, the signal detection assembly 10 of the low temperature gas leakage detection system includes at least one set of acoustic wave transmitters 120 for transmitting acoustic wave signals, and an acoustic wave receiver 140 for receiving acoustic wave signals.
Optionally, each acoustic wave emitter 120 may further have a function of receiving an acoustic wave signal; the acoustic wave receiver 140 may be provided with a function of transmitting an acoustic wave signal.
Alternatively, the acoustic wave emitter 120 may include a pulse acoustic wave emitter 121 and an acoustic wave transducer 122, where the pulse acoustic wave emitter 121 is configured to emit a pulse signal, and the acoustic wave transducer 122 converts the pulse signal into an acoustic wave signal for emission.
Correspondingly, the acoustic receiver 140 may include an acoustic transducer 141 and a signal collector 142, where the acoustic transducer 141 converts an acoustic signal into a pulse signal, and the signal collector 142 collects the pulse signal.
When the signal detection assembly 10 includes at least one set of sonic transmitters 120 and sonic receivers 140, it is generally desirable to locate the sonic transmitters 120 and sonic receivers 140 in one set at a relative position around the periphery of the media field, with no obstructions between each set of sonic transmitters 120 and sonic receivers 140.
The obstacle referred to herein refers to an obstacle disposed in a medium field, such as a storage device for storing a low-temperature gas, various devices such as a pipeline and a tower, a pipeline and its auxiliary facilities, and the like.
In order to enable the medium field to be monitored in all directions, opposing acoustic wave transmitters 120 and acoustic wave receivers 140 may be arranged around the medium field, respectively. Alternatively, one acoustic wave emitter 120 may correspond to a plurality of acoustic wave receivers 140, and the acoustic wave receivers 140 may be located on the same horizontal plane or may be located on different horizontal planes. Alternatively, one sonic receiver 140 may correspond to a plurality of sonic transmitters 120, and the sonic transmitters 120 may be located on the same horizontal plane or on different horizontal planes.
In one possible implementation, as shown in fig. 2B, a first pillar 21 for mounting an acoustic wave emitter and a second pillar 22 for mounting acoustic wave receivers are provided on the periphery of the dielectric field 20, the number of acoustic wave receivers provided on the second pillar 22 opposite to the first pillar 21 is at least two, and at least two acoustic wave receivers on the same second pillar 22 are provided on the second pillar 22 up and down.
That is, at least one acoustic wave emitter 120 is disposed on the first upright 21, and at least two acoustic wave receivers 140 are disposed on the second upright 22 corresponding to the first upright 21, so that a transmission path can be formed between the acoustic wave emitter 120 and each acoustic wave receiver 140, and the angles of each transmission path are different, thereby realizing the monitoring of more directions of the medium field.
During the low temperature gas detection, for each set of the acoustic wave emitter 120 and the acoustic wave receiver 140, the controller controls the acoustic wave emitter 120 to emit an acoustic wave signal, and the acoustic wave receiver 140 receives the acoustic wave signal correspondingly. The computing device calculates a flight time of the acoustic wave signal on a transmission path between the acoustic wave transmitter 120 and the acoustic wave receiver 140, and determines that there is low-temperature gas leaking from the storage device on the transmission path when a rate of change of the flight time on the transmission path is greater than a first threshold value.
On either transmission path, the local sound velocity c 0 The relationship with the local temperature and the type of medium is:
c 0 ＝(γRT) 0.5
wherein, gamma is the specific heat ratio of gas, namely the ratio of the specific heat of constant pressure to the specific heat of constant capacity; r is a universal gas constant; t is the local geomechanical temperature.
If the medium (i.e. the low-temperature gas) leaks, the type and temperature of the gas in the air are changed, and the sound velocity difference caused by the temperature change is very obvious. For example, if the ambient temperature is 300K, the ambient temperature of the equipment after tank leakage is-200K (-73 ℃) which results in a difference of about 20% in local sound velocity. The leaked low-temperature gas is low in temperature, and meanwhile, the temperature of surrounding air is remarkably reduced.
The flight time τ on a single transmission path is:
wherein the upper integral limit L i Indicating the full length of the ith transmission path; c 0,x Representing the local sound velocity at points x along the transmission path.
When the change rate of the leap duration on one transmission path is larger than a first threshold value, the existence of low-temperature gas leaked from the storage device on the transmission path is judged.
In order to make the determination more accurate, the determination may be made in combination with the flight duration of all transmission paths. After the sound wave flight time of all transmission paths is obtained, the spatial temperature distribution with a certain resolution can be obtained through a projection reconstruction algorithm.
In this scenario, accurate temperature profile measurements are not necessary, and a significant difference in spatial temperature profile (e.g., a rate of change of spatial temperature profile greater than a second threshold) over successive time periods, especially when there is a significant lower deviation from normal, is indicative of a low temperature gas leak somewhere in the full field.
Fig. 2C is a graph showing the extent of diffusion of a typical LNG tank in an LNG liquefaction plant after leakage, and it is seen from fig. 2C that the tank 36.1m has significant leakage natural gas distribution in the range of diameter of 211m below 12.2m height, and that only these areas exist in the low temperature region, or that in the LNG plant, the low temperature region generated by the low temperature leakage medium is attached only around the leakage equipment. Thus, in the factory boundary area shown in fig. 2C, the columns for mounting the acoustic wave transmitters and acoustic wave receivers can be mounted either alone or directly on the factory equipment, which is important for retrofitting an existing factory.
In another possible implementation manner, in consideration of the fact that the area of the detected medium field is relatively large or the equipment or structure in the medium field is relatively complex, especially in the case that the medium field is provided with relatively high equipment or building, a manner of arranging the acoustic wave transmitter or the acoustic wave receiver in the gas space formed in the medium field is also provided in the embodiment of the present application. It should be noted that, since the gas space formed in the medium place is normally filled with air, and low-temperature gas is filled after low-temperature gas leaks, the gas space formed in the medium place can accommodate the signal detection component, and a necessary condition is formed for the signal detection component to be disposed inside the gas space formed in the medium place.
Optionally, an acoustic transmitter of at least one set of signal detection assemblies is placed inside the gas space formed by the medium location to be detected, and the acoustic transmitter is arranged to be movable such that the acoustic signal emitted by the acoustic transmitter can reach an acoustic receiver (or detector) placed outside another distance without obstruction. In this way, a set of movable detectors is placed in the dielectric field, and the signals emitted by them can always avoid various types of obstacles.
Referring to fig. 2D, the acoustic wave emitter 120 is disposed inside the gas space formed by the dielectric field, and the acoustic wave receiver 140 is disposed on the pillars 23 and 24 at the periphery of the dielectric field. For each acoustic transmitter 120, the acoustic signal it transmits is sent to an unobstructed acoustic receiver 140 from the acoustic transmitter 120. Thus, the computing device 12 can compute the acoustic wave signal acquired by the acoustic wave receiver 140, and determine whether the leakage of the low-temperature gas exists in the medium field.
Alternatively, when at least one acoustic transmitter is disposed inside the gas space formed by the dielectric field, several acoustic receivers may also be disposed at opposite locations on the periphery of the dielectric field. Further, the relative positions may pass through the acoustic transmitter. For example, in fig. 2D, sonic receiver 140 disposed on post 23 and sonic receiver 140 disposed on post 24 may pass through one of sonic transmitters 120.
Optionally, when at least one acoustic wave emitter is disposed inside the gas space formed in the medium place, at least one acoustic wave receiver may be disposed inside the gas space formed in the medium place, so that no obstacle exists between the acoustic wave emitter and the acoustic wave receiver disposed inside the gas space, or no obstacle exists between the acoustic wave receiver disposed inside the gas space and the acoustic wave receiver disposed at other positions.
In practical applications, at least one acoustic receiver may be disposed within the gas space formed by the dielectric field, and at least one acoustic transmitter may be disposed on the post at the periphery of the dielectric field. Optionally, when at least one acoustic receiver is disposed inside the gas space formed by the dielectric field, a plurality of acoustic emitters may also be disposed at opposite positions of the periphery of the dielectric field, with the acoustic emitters passing between the opposite positions. Alternatively, when at least one acoustic receiver is disposed inside the gas space formed by the media site, at least one acoustic transmitter may also be disposed inside the gas space formed by the media site.
Optionally, moving the sonic transmitter or sonic receiver disposed within the gas space formed by the media site leaves at least one set of sonic receivers clear of obstructions between the sonic receivers.
In summary, in the low-temperature gas leakage detection system provided by the embodiment of the invention, by calculating the flight time length on the transmission path between the acoustic wave transmitter and the acoustic wave receiver, when the change rate of the flight time length on the transmission path is greater than the first threshold value, it is indicated that there is sudden gas intervention on the transmission path, and at this time, it can be determined that there is low-temperature gas leaked from the storage device on the transmission path.
Since the low-temperature gas is generally diffused into the air after leakage, and then the moisture in the air condenses into water droplets to float in the low air, the signal detection assembly 10 can be provided with an electromagnetic wave transceiver having an electromagnetic wave transmitting and receiving function according to the characteristic of the low-temperature gas.
Referring to fig. 3A, the signal detecting assembly 10 in the low temperature gas leakage detecting system includes at least one electromagnetic wave transceiver 160 for transmitting and receiving electromagnetic waves.
Alternatively, the electromagnetic wave transceiver 160 may include a pulsed acoustic wave emitter 161 and a first electromagnetic wave transducer 162, the pulsed acoustic wave emitter 161 being configured to emit a pulsed signal, the first electromagnetic wave transducer 162 converting the pulsed signal into an electromagnetic wave signal for emission.
Correspondingly, the electromagnetic wave transceiver 160 may further include a second electromagnetic wave transducer 163 and a signal collector 164, the second electromagnetic wave transducer 163 converting an electromagnetic wave signal into a pulse signal, the signal collector collecting the pulse signal. The first electromagnetic wave transducer 162 and the second electromagnetic wave transducer 163 may be integrated transducers having a function of converting a pulse signal into an electromagnetic wave signal and also having a function of converting an electromagnetic wave signal into a pulse signal.
When the signal detection assembly 10 includes at least one electromagnetic wave transceiver 160, the at least one electromagnetic wave transceiver 160 may be disposed at a location peripheral to the media field.
In one possible implementation, referring to fig. 3B, an electromagnetic wave transceiver 160 is disposed on the periphery of the dielectric field 30, and the electromagnetic wave transceiver 160 can emit electromagnetic waves into the dielectric field 30. In order to allow for an omnidirectional monitoring of the medium field 30, the transmission direction of the electromagnetic wave transceiver 160 is configured to be adjustable. In principle, the electromagnetic wave transceiver 160 may emit electromagnetic waves in either direction within the media field 30.
Optionally, an electromagnetic wave emitter 160 may also be provided inside the media field, and similarly, the emission direction of the electromagnetic wave emitter 160 is configured to be adjustable. In principle, the electromagnetic wave transceiver 160 may emit electromagnetic waves in either direction within the media field.
For any one of the electromagnetic wave transceivers 160, the controller 14 is configured to control the electromagnetic wave transceiver 160 to emit electromagnetic waves into the media field; the computing device 12 is further configured to detect whether the electromagnetic wave transceiver 160 receives the reflected electromagnetic wave, and determine that the low-temperature gas leaking from the storage device exists in the medium field when the electromagnetic wave transceiver 160 receives the reflected electromagnetic wave.
Since water in the air can form water drops to float at low air after encountering low-temperature gas, and electromagnetic waves have the characteristic of encountering obstacle reflection, the signal detection assembly is arranged as an electromagnetic wave transceiver 160, and if the electromagnetic waves reflected by the electromagnetic wave transceiver 160 can be reflected, the water drops floating at low air are encountered, and the reflected electromagnetic waves mean that the low-temperature gas leaks in a medium field when the weather is clear.
In rainy days or snowy days, rainwater and snowflake are generally uniformly distributed in the medium field, but if low-temperature gas leaks at this time, the low-temperature gas can be diffused in the medium field, so that water drops in the form of moisture in air are non-uniform in the medium field, and thus the whole water drops or particles in the medium field are non-uniform, and under the condition, the condition of electromagnetic wave reflection in all directions in the medium field can be detected to judge whether the water drops or particles in the medium field are uniformly distributed.
In this case, the controller is configured to adjust the emission direction of the electromagnetic wave transceiver 160 at predetermined time intervals, the emission direction being horizontally directed into the medium field, and to control the electromagnetic wave transceiver 160 after adjusting the emission direction to emit electromagnetic waves. That is, each time the transmission direction is adjusted, an electromagnetic wave is transmitted in the transmission direction by the electromagnetic wave transceiver 160, and the reflected electromagnetic wave is received; then, the next adjustment of the emission direction is performed, and the step of emitting electromagnetic waves in the emission direction by using the electromagnetic wave transceiver 160 and receiving the reflected electromagnetic waves is continuously performed until the emission direction is uniformly distributed throughout the medium field.
That is, the controller is further configured to acquire the reflected electromagnetic waves corresponding to the respective transmission directions received by the electromagnetic wave transceiver 160, and determine that the low-temperature gas leaked from the storage device exists in the medium field if the similarity between at least two sets of electromagnetic waves in the reflected electromagnetic waves is greater than a predetermined similarity threshold.
A full field leak monitoring method as shown in fig. 3C is employed. An electromagnetic wave transceiver 160 is mounted on the upright, the electromagnetic wave transceiver 160 can be a mechanical rotation radar or a phased array radar, the electromagnetic wave transceiver 160 emits signals towards a medium field, and when low-temperature gas leaks, such as liquefied natural gas, the ambient temperature is rapidly reduced, which causes moisture in the air to be rapidly condensed into water drops 31 and float at low altitude, and a water vapor cloud is formed. Under normal environmental conditions, there is no water vapor cloud at low altitudes. Therefore, when the pulse electromagnetic signal passes through the water vapor cloud cluster, strong reflection is generated to form radar echo, so that leakage of low-temperature gas can be judged, and the method is similar to a remote precipitation process adopting Doppler radar for telemetering.
In an alternative manner, the electromagnetic wave transceiver may be disposed inside the gas space formed in the medium field, and since the electromagnetic wave transceiver may emit electromagnetic waves in all directions, when the electromagnetic wave transceiver is disposed inside the medium field, if a radar echo mutation is detected or when the radar echo difference from the sunny day is relatively large, it may be determined that there may be a low-temperature gas leakage in the medium field.
If the environment itself is in a precipitation state, such as raining, snowing, etc., the risk of ignition and explosion after natural gas leakage has been greatly reduced.
In summary, in the low-temperature gas leakage detection system provided by the embodiment of the invention, the signal detection assembly is configured as the electromagnetic wave transceiver, and because water in the air can form water drops to float in low air after encountering low-temperature gas, and electromagnetic waves have the characteristic of encountering obstacle reflection, the signal detection assembly is configured as the electromagnetic wave transceiver, if the electromagnetic waves reflected by the electromagnetic wave transceiver can reflect, the reflected electromagnetic waves indicate that water drops floating in low air are encountered, and when weather is clear, the reflected electromagnetic waves mean that the leakage of low-temperature gas exists in a medium field.
By adjusting the transmitting direction of the electromagnetic wave transceiver, the detectable area of the electromagnetic wave transceiver is enlarged, and the comprehensiveness of the leakage detection of the low-temperature gas in the medium field is improved.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (7)
1. The low-temperature gas leakage detection system is characterized by comprising a signal detection assembly, an operation device and a controller, wherein the signal detection assembly is used for performing full-field detection on low-temperature gas in a medium field to be detected, the operation device is connected with the signal detection assembly, and the controller is connected with the signal detection assembly;
the signal detection assembly comprises at least one electromagnetic wave transceiver for emitting electromagnetic waves, the electromagnetic wave transceiver is positioned at the periphery of the medium field or positioned in the medium field, and the electromagnetic wave transceiver is arranged to be movable;
the controller is used for adjusting the transmitting direction of the electromagnetic wave transceiver at preset time intervals, the transmitting direction points to the medium field, and the electromagnetic wave transceiver after adjusting the transmitting direction is controlled to transmit electromagnetic waves according to the adjusted transmitting direction;
the controller is further configured to obtain the reflected electromagnetic waves corresponding to each emission direction received by the electromagnetic wave transceiver, and determine that the low-temperature gas leaked from the storage device exists in the medium field if the similarity between at least two groups of electromagnetic waves in the reflected electromagnetic waves is greater than a predetermined similarity threshold value in a rainy day or a snowy day.
2. The low temperature gas leakage detection system according to claim 1, wherein the signal detection assembly comprises an acoustic wave transmitter for transmitting an acoustic wave signal and an acoustic wave receiver for receiving an acoustic wave signal;
the sound wave transmitters or sound wave receivers in at least one group of signal detection assemblies are positioned in the gas space formed by the medium field, no obstacle exists between each group of sound wave transmitters or sound wave receivers, and the sound wave transmitters or sound wave receivers are arranged to be movable;
and/or the number of the groups of groups,
at least one set of acoustic wave transmitters and acoustic wave receivers are located opposite the periphery of the dielectric field with no obstruction between each set of acoustic wave transmitters and acoustic wave receivers.
3. The low-temperature gas leakage detection system according to claim 2, further comprising a first column for mounting the acoustic wave emitter, and a second column for mounting the acoustic wave receiver;
the number of the sound wave receivers arranged on the second upright post opposite to the first upright post is at least two, and the at least two sound wave receivers on the same second upright post are arranged on the second upright post up and down.
4. A low temperature gas leakage detection system according to claim 2 or 3, wherein,
for each set of acoustic transmitters and acoustic receivers, the controller is configured to control the acoustic transmitters to transmit acoustic signals;
the sound wave receiver is used for receiving the sound wave signal;
the computing device is used for calculating the flight time length of the sound wave signal on a transmission path between the sound wave transmitter and the sound wave receiver, and judging that low-temperature gas leaked from the storage device exists on the transmission path when the change rate of the flight time length on the transmission path is larger than a first threshold value.
5. A low temperature gas leakage detection system according to claim 2 or 3, wherein,
for each acoustic transmitter, the controller is configured to control the acoustic transmitter to transmit an acoustic signal;
each acoustic receiver is used for receiving the acoustic signal;
the computing device is used for calculating the flight time length of the sound wave signal on the transmission path between the sound wave transmitter and each sound wave receiver, and reconstructing the spatial temperature distribution by utilizing the obtained projection of each flight time length, and judging that the low-temperature gas leaked from the storage device exists in the medium field when the change rate of the spatial temperature distribution is larger than a second threshold value.
6. The low-temperature gas leakage detection system according to claim 1, wherein,
for any one of the electromagnetic wave transceivers, the controller is used for controlling the electromagnetic wave transceiver to emit electromagnetic waves into the medium field;
the operation device is further used for detecting whether the electromagnetic wave transceiver receives the reflected electromagnetic wave or not, and judging that low-temperature gas leaked from the storage device exists in the medium field when the electromagnetic wave transceiver receives the reflected electromagnetic wave in sunny weather.
7. The low-temperature gas leakage detection system according to claim 1, further comprising a display device electrically connected to the operation device, the display device being configured to display a detection result output by the operation device.
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