CN112257839A - Seabed methane bubble counting device and method - Google Patents
Seabed methane bubble counting device and method Download PDFInfo
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- CN112257839A CN112257839A CN202011140674.3A CN202011140674A CN112257839A CN 112257839 A CN112257839 A CN 112257839A CN 202011140674 A CN202011140674 A CN 202011140674A CN 112257839 A CN112257839 A CN 112257839A
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Abstract
The invention belongs to the technical field of submarine methane detection. Aiming at the problems that the deep-sea methane in-situ detection cost is high, and the accuracy of the detection result obtained by extracting a methane sample from the seabed is low, the device and the method for counting the bubbles of the seabed methane are provided. The device comprises a cover body, wherein a flap-shaped sampler is arranged in the cover body around a through hole, and a sample accommodating cavity is formed after the flap-shaped sampler is inwards closed; a cover plate is arranged above the petal-shaped sampler, and an ultrasonic transmitter and an ultrasonic receiver are oppositely arranged in the middle of the cover plate; an underwater propeller is arranged in the top pipe of the sliding pipe; the sliding magnetic ring is sleeved on the sliding tube and slides under the action of the electromagnet, the sliding magnetic ring drives the petal-shaped sampler to be closed through the pull rod when sliding towards one direction, and the sliding magnetic ring drives the petal-shaped sampler to be unfolded when sliding towards the opposite direction. Set up the sampler into the petal shape that can contract and open, realized carrying out the detection of sample in situ immediately after random sampling, the degree of accuracy of detection is high, simple structure, convenient operation.
Description
Technical Field
The invention belongs to the technical field of submarine methane detection, and particularly relates to a methane bubble counting device and a methane bubble counting method.
Background
In the world, land energy is approaching to the state of short supply, a new energy source is urgently needed by human to support industrial development, and submarine methane is paid much attention as a brand-new clean energy source. With the progress of ocean exploration, the exploration and exploitation of seabed methane gas are increasingly and globally, and how to quickly find and determine the methane storage amount of a certain methane storage area on the seabed is very important. In the traditional method, a scientific research worker extracts methane from a seabed sample into the atmosphere and then carries out concentration detection, and due to the huge difference of the atmospheric pressure, the concentration of the methane can be greatly changed at the same time, so that the real concentration of the methane cannot be known. The technology is a new technology developed by cooperation of Zhangxin doctor of China academy of sciences, ocean research institute and American society of research of Monte-Jack gulf aquaria, and is based on a deep-sea cabled underwater Robot (ROV). Because the deep-sea methane in-situ detection system has high detection cost, and the detection result of the traditional method of extracting methane from a seabed sample and then detecting the concentration is low in accuracy, a seabed methane reserve detection technology with low cost and high accuracy needs to be researched.
Disclosure of Invention
The invention provides a seabed methane bubble counting device and a counting method, aiming at the problems that a deep sea methane in-situ detection system technology is high in detection cost, and the accuracy of a detection result is low in a mode of extracting a methane sample from the seabed and then detecting the concentration.
The invention is realized by the following counting scheme:
a seabed methane bubble counting device comprises a cover body, a sliding pipe, an underwater propeller, an electromagnet, a sliding magnetic ring, a cover plate, a petal-shaped sampler and a pull rod;
the top of the cover body is provided with a first through hole, the first through hole is provided with a pipe body extending upwards outside the cover body, a petal-shaped sampler is arranged in the cover body around the through hole and movably connected with the cover body, and the petal-shaped sampler forms a sample containing cavity after being inwardly closed; a cover plate is fixedly arranged above the petal-shaped sampler, a second through hole is formed in the middle of the cover plate, an ultrasonic transmitter and an ultrasonic receiver are oppositely arranged on the inner wall of the second through hole, and a third through hole is formed in the periphery of the second through hole;
the sliding pipe is arranged in the pipe body, the outer side wall of the sliding pipe is hermetically connected with the upper end of the pipe body, the underwater propeller is arranged in the top pipe of the sliding pipe, and the bottom of the sliding pipe is communicated with the space in the cover body;
the electromagnet and the sliding magnetic ring are arranged in a cavity formed by the pipe body, the sliding pipe and the cover plate, the sliding magnetic ring is sleeved on the sliding pipe, a coil of the electromagnet generates magnetism after being electrified, the sliding magnetic ring is driven to slide in one direction along the sliding pipe, the current direction is changed, and the sliding magnetic ring is driven to slide in the opposite direction;
the pull rod penetrates through the third through hole, one end of the pull rod is movably connected with the petal-shaped sampler, and the other end of the pull rod is movably connected with the sliding magnetic ring; when the sliding magnetic ring slides towards one direction, the sliding magnetic ring drives the petal-shaped sampler to be closed inwards through the pull rod, and when the sliding magnetic ring slides towards the opposite direction, the sliding magnetic ring drives the petal-shaped sampler to be unfolded outwards through the pull rod.
Further, the pipe body above the cover body is a conical pipe, and the large hole end of the conical pipe is downwards connected with the cover body.
Further, the petal-shaped sampler is hinged with the cover body; the pull rod is hinged with the petal-shaped sampler and the sliding magnetic ring.
Further, the outer side wall of the cover plate is fixedly connected with the inner wall of the cover body; or the cover plate is fixedly connected with the bottom of the sliding pipe.
Furthermore, the electromagnet is arranged above the sliding magnetic ring, a coil of the electromagnet is wound on the sliding tube, and the iron core is in a strip shape or a tube shape.
Further, the ultrasonic transmitter and the ultrasonic receiver are connected with the central processing unit.
Further, the number of the ultrasonic transmitter and the ultrasonic receiver is two.
The invention also provides a method for counting the submarine methane sampling bubbles, which comprises the following steps:
(1) the seabed methane bubble counting device is placed at a seabed methane gas gushing port, the underwater propeller starts to work, and micro undercurrent is manufactured to guide methane bubbles to enter the cover body;
(2) the electromagnetic coil is electrified, the electromagnet generates magnetism, the sliding magnetic ring slides upwards under the action of the electromagnet by utilizing the principle that like poles repel and opposite poles attract, the pull rod is driven to contract, the petal-shaped sampler is closed, namely, the seawater at the methane gas spouting port is randomly sampled for one time, methane bubbles in the sampler sequentially pass through the ultrasonic bubble detection device under the action of a dark current manufactured by the miniature underwater propeller, and the ultrasonic bubble detection device sends an electric signal to the control system once detecting the bubbles, so that counting accumulation is generated;
(3) when the ultrasonic bubble detection device does not send a bubble signal any more, a reverse current is introduced to the electromagnet coil, the directions of two magnetic poles of the electromagnet are changed, the sliding magnetic ring slides downwards to drive the pull rod to extend, the petal-shaped sampler is started to prepare for next sampling; if necessary, multiple sampling counts are performed.
Furthermore, the electromagnet is arranged above the sliding magnetic ring, the electromagnet coil is electrified, the magnetic pole at the lower end of the electromagnet is different from the magnetism of the upper end of the sliding magnetic ring to generate attraction, the sliding magnetic ring slides upwards to drive the pull rod to contract, and the petal-shaped sampler is closed; after the electromagnet is electrified with reverse current, the lower end of the electromagnet has the same magnetism as the upper end of the sliding magnetic ring to generate repulsive force, the sliding magnetic ring slides downwards to drive the pull rod to extend, and the petal-shaped sampler is started.
The invention determines relatively independent sampling positions through the cover body, micro undercurrent is manufactured through the underwater propeller to guide methane bubbles to enter the cover body, the sliding direction of the sliding magnetic ring is changed by changing the current direction of the electromagnet, and the opening and closing of the sampler are further controlled through the pull rod; the sampler is arranged into a valve shape which can be contracted and opened, so that the sample can be immediately detected in situ after random sampling is realized, methane bubbles in the sampler sequentially pass through the ultrasonic bubble detection device under the action of the undercurrent produced by the miniature underwater propeller, and the detection accuracy is high. The device can be used for cyclic sampling detection. The device has simple structure and convenient operation.
The more methane gas is stored in a methane storage place, the larger the generated air pressure is, the larger the methane gushing port and the pressure difference between the inside and the outside are, the faster the velocity of the methane gas gushing from the gushing port to the outside is, the sampling process is completed by the methane bubble counting device, the more methane bubbles are in the sampler, therefore, the flow velocity of the gas at different methane gas gushing ports can be calculated by calculating the number of the methane bubbles in the sampler at different times or different places, the stress condition of the bubbles is reversely pushed, the pressure difference between seawater at the methane gas gushing port and the methane gas is further calculated, and the storage amount of the methane is finally calculated.
Drawings
FIG. 1 is a schematic perspective view of a housing;
FIG. 2 is a schematic cross-sectional view of the mask body;
FIG. 3 is a schematic view of the structure of the sliding tube;
FIG. 4 is a schematic structural diagram of a petal-shaped sampler;
FIG. 5 is a schematic diagram of a subsea methane bubble counting device with a flap sampler closed;
FIG. 6 is a schematic view of a cover plate structure;
FIG. 7 is a schematic view of a configuration of an underwater propulsion unit;
FIG. 8 is a schematic view of an electromagnet;
FIG. 9 is a schematic view of the structure of the drawbar;
FIG. 10 is a schematic view of a sliding magnet ring;
fig. 11 is a schematic diagram of the seafloor methane bubble counting device with the flap sampler turned on.
In each of the above figures, 1, a slide tube; 2. a cover body; 21. a pipe body; 3. an electromagnet; 4. a sliding magnetic ring; 5. a cover plate; 51 a second through hole; 52. a third through hole; 6. a petal-shaped sampler; 7. a pull rod; 8. an ultrasonic transmitter; 9. an ultrasonic receiver; 10. provided is an underwater propeller.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings.
A seabed methane bubble counting device comprises a cover body 2, a sliding pipe 1 arranged in the cover body, an underwater propeller 10, an electromagnet 3, a sliding magnetic ring 4, a cover plate 5, a petal-shaped sampler 6 and a pull rod 7. The cover body 2 provides a sampling space, relatively isolates a position to be sampled from other positions, as long as it provides a relatively independent space on the seabed, and is not limited in shape, and preferably circular in view of convenience of processing and structural stability.
The top of the cover body 2 is provided with a first through hole, the first through hole is provided with a pipe body 21 extending to the upper part outside the cover body, a sliding pipe 1 (figure 3) is arranged in the pipe body, and the top of the sliding pipe is opened to allow seawater containing methane bubbles below to pass through. The sliding tube 1 is connected with the upper end of the tube body 21 in a sealing way, and a cavity is formed between the sliding tube 1 and the tube body 21, is used for accommodating the electromagnet 3 and the sliding magnetic ring 4 and provides a space for the sliding magnetic ring 4 to move up and down. The shape of the tube 21 is preferably tapered as shown in fig. 2, but is not to be construed as limiting the shape of the tube 21. The tube 1 may be integrally formed with the cover 2.
A plurality of petal-shaped samplers 6 (see fig. 4) are arranged in the cover body 2 around the through holes, the petal-shaped samplers 6 are movably connected with the cover body 1, and a sample containing cavity (see fig. 5) is formed after the petal-shaped samplers 6 are inwards closed. Preferably the flap sampler 6 is hinged to the housing 1 in a manner that allows the flap sampler 6 to reciprocate in one dimension to effect closing and opening of the flap sampler 6.
A cover plate 5 (see fig. 6) is fixedly arranged above the petal-shaped sampler, a second through hole 51 is formed in the middle of the cover plate 5, and a third through hole 52 is formed in the periphery of the second through hole 51. The ultrasonic transmitter 8 and the ultrasonic receiver 9 are oppositely disposed on the inner wall of the second through hole 51 (see fig. 5). The outer side wall of the cover plate 5 is fixedly connected with the inner wall of the cover body 2 so as to realize the fixation of the position; or the cover plate 5 is fixedly connected with the bottom of the sliding tube 1 so as to realize the fixation of the position thereof.
An underwater propeller (see fig. 7) is arranged in the top pipe of the sliding pipe, and the underwater propeller makes micro blind flow in the sliding pipe to guide methane bubbles into the cover body. The underwater propeller can be selected according to the requirement, for example, a direct current brushless propeller is adopted, and the technical personnel in the field can also improve the existing underwater propeller as long as the functions can be realized.
In a cavity formed by the tube body 21, the sliding tube 1 and the cover plate 5, the sliding magnetic ring 4 is sleeved on the sliding tube, after the coil of the electromagnet 3 is electrified with direct current, the iron core generates magnetism to drive the sliding magnetic ring 4 to slide along the sliding tube 1, the current direction is changed, and the iron core drives the sliding magnetic ring 4 to slide along the opposite direction. The electromagnet comprises a tubular iron core and a coil wound outside the iron core (see fig. 8), and the iron core is sleeved on the sliding tube (see fig. 5). The iron core can also be arranged into a bar shape or other shapes, so that one magnetic pole of the iron core is attracted or repelled with the sliding magnetic ring 4 after being electrified, and sufficient magnetic force is generated. The electromagnet 3 is preferably arranged above the sliding magnetic ring 4, a coil of the electromagnet 3 is electrified, one magnetic pole of the electromagnet 3 is different from the upper end of the sliding magnetic ring 4 in magnetism, attraction is generated, and the sliding magnetic ring 4 slides upwards; the coil of the electromagnet 3 is electrified with reverse current, the direction of the magnetic pole of the electromagnet 3 is changed, the magnetism of the electromagnet 3 is the same as that of the upper end of the sliding magnetic ring 4, repulsive force is generated, and the sliding magnetic ring 4 slides downwards.
The movable sliding magnetic ring 4 and the petal-shaped sampler 6 are linked through a pull rod 7 (see fig. 9), the pull rod 7 penetrates through the third through hole 52, the petal-shaped sampler 6 is driven to be closed inwards through the pull rod 7 when the sliding magnetic ring 4 slides towards one direction, and the petal-shaped sampler 6 is driven to be unfolded outwards through the pull rod 7 when the sliding magnetic ring 4 slides towards the opposite direction (see fig. 11). Preferably, the pull rod 7 is hinged with the petal-shaped sampler 6 and the sliding magnetic ring 4. As shown in fig. 4, in the middle of the side surface of the petal-shaped sampler, structures hinged to the pull rod are arranged on the sliding magnetic ring as shown in fig. 10, and the sliding magnetic ring can be movably connected to the pull rod after a pin is inserted. This connection is preferred and the skilled person can also make alternatives to the relevant means.
The working process and principle are as follows:
as shown in fig. 5 and 10, the submarine methane bubble counting device is placed at the submarine methane gas gushing port, the underwater propeller 10 starts to work, and micro-undercurrent is produced to guide methane bubbles into the cover body 2; the coil of the electromagnet 3 is electrified, the electromagnet generates magnetism through the magnetic effect of current, the sliding magnetic ring 4 slides on the sliding tube in one direction through repulsive force or attractive force under the action of the electromagnet by utilizing the principle that like poles repel each other and opposite poles attract each other, the current direction is changed, the magnetic pole direction of the electromagnet is changed, and the sliding magnetic ring 4 slides on the sliding tube in the opposite direction. When the sliding magnetic ring 4 slides on the sliding tube along one direction, the sliding magnetic ring drives the petal-shaped sampler to be opened (or closed) through the pull rod, and when the sliding magnetic ring 4 slides towards the opposite direction, the sliding magnetic ring drives the petal-shaped sampler to be closed (or opened) through the pull rod. The flap sampler 6 is closed, which is equivalent to randomly sampling the seawater at the methane gas gushing port for one time, and the flap sampler 6 is opened to prepare for sampling for the next time. For example, an electromagnet is arranged above a magnetic ring, after the electromagnet is powered on, because the magnetism of the lower end of the electromagnet is different from that of the upper end of a sliding magnetic ring, attraction force is generated, the sliding magnetic ring 4 slides upwards to drive a pull rod 7 to contract, a petal-shaped sampler 6 is closed (figure 5), methane bubbles in the sampler sequentially pass through an ultrasonic bubble detection device (consisting of an ultrasonic transmitter 8 and an ultrasonic receiver 9) under the action of a dark current produced by a micro underwater propeller, and the ultrasonic bubble detection device sends an electric signal to a central processing unit once every time the bubbles are detected, so that counting accumulation is generated. When the ultrasonic bubble detection device does not send a bubble signal any more, a reverse current is introduced to the electromagnet 3, the magnetism of the lower end of the electromagnet is the same as that of the upper end of the sliding magnetic ring, a repulsive force is generated, the sliding magnetic ring 4 slides downwards to drive the pull rod 7 to extend outwards, the petal-shaped sampler 6 is opened (figure 11), and the next sampling is ready to be carried out; if necessary, multiple sampling counts are performed.
Because the more methane gas is stored in the methane storage place, the larger the generated gas pressure is, the larger the difference between the methane spouting port and the internal and external pressure is, the faster the velocity of the methane gas from the spouting port to the outside spouting port is, and the more methane bubbles are in the sampler after the methane bubble counting device completes the sampling process, therefore, the flow velocity of the gas at different methane gas spouting ports can be calculated by calculating the number of the methane bubbles in the sampler at different times or different places, the bubble stress condition is reversely deduced, the pressure difference between the seawater at the methane gas spouting port and the methane gas is further calculated, and the storage amount of the methane is finally calculated.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (9)
1. A seabed methane bubble counting device is characterized by comprising a cover body, a sliding pipe, an underwater propeller, an electromagnet, a sliding magnetic ring, a cover plate, a petal-shaped sampler and a pull rod;
the top of the cover body is provided with a first through hole, the first through hole is provided with a pipe body extending upwards outside the cover body, a petal-shaped sampler is arranged in the cover body around the through hole and movably connected with the cover body, and the petal-shaped sampler forms a sample containing cavity after being inwardly closed; a cover plate is fixedly arranged above the petal-shaped sampler, a second through hole is formed in the middle of the cover plate, an ultrasonic transmitter and an ultrasonic receiver are oppositely arranged on the inner wall of the second through hole, and a third through hole is formed in the periphery of the second through hole;
the sliding pipe is arranged in the pipe body, the outer side wall of the sliding pipe is hermetically connected with the upper end of the pipe body, the underwater propeller is arranged in the top pipe of the sliding pipe, and the bottom of the sliding pipe is communicated with the space in the cover body;
the electromagnet and the sliding magnetic ring are arranged in a cavity formed by the pipe body, the sliding pipe and the cover plate, the sliding magnetic ring is sleeved on the sliding pipe, a coil of the electromagnet generates magnetism after being electrified, the sliding magnetic ring is driven to slide in one direction along the sliding pipe, the current direction is changed, and the sliding magnetic ring is driven to slide in the opposite direction;
the pull rod penetrates through the third through hole, one end of the pull rod is movably connected with the petal-shaped sampler, and the other end of the pull rod is movably connected with the sliding magnetic ring; when the sliding magnetic ring slides towards one direction, the sliding magnetic ring drives the petal-shaped sampler to be closed inwards through the pull rod, and when the sliding magnetic ring slides towards the opposite direction, the sliding magnetic ring drives the petal-shaped sampler to be unfolded outwards through the pull rod.
2. The subsea methane bubble counting device according to claim 1, wherein the tube body above the hood is a conical tube, and the large hole end of the conical tube is connected with the hood downward.
3. The subsea methane bubble counting device according to claim 1, wherein the flap sampler is hinged to the cover; the pull rod is hinged with the petal-shaped sampler and the sliding magnetic ring.
4. The subsea methane bubble counting device according to claim 1, wherein the outer side wall of the cover plate is fixedly connected to the inner wall of the housing; or the cover plate is fixedly connected with the bottom of the sliding pipe.
5. The seafloor methane bubble counting device of claim 1, wherein the electromagnet is arranged above the sliding magnetic ring, a coil of the electromagnet is wound on the sliding pipe, and an iron core is in a strip shape or a pipe shape.
6. The subsea methane bubble counting device according to claim 1, wherein the ultrasonic transmitter and ultrasonic receiver are connected to a central processor.
7. The subsea methane bubble counting device according to claim 1, wherein there are two ultrasonic transmitters and ultrasonic receivers, respectively.
8. A method for counting bubbles in a submarine methane sampling is characterized by comprising the following steps:
(1) placing the subsea methane bubble counting device of claim 1 at a subsea methane gas surge port, and starting the underwater propulsor to create a micro-undercurrent to direct methane bubbles into the housing;
(2) the electromagnetic coil is electrified, the electromagnet generates magnetism, the sliding magnetic ring slides upwards under the action of the electromagnet by utilizing the principle that like poles repel and opposite poles attract, the pull rod is driven to contract, the petal-shaped sampler is closed, namely, the seawater at the methane gas spouting port is randomly sampled for one time, methane bubbles in the sampler sequentially pass through the ultrasonic bubble detection device under the action of a dark current manufactured by the miniature underwater propeller, and the ultrasonic bubble detection device sends an electric signal to the control system once detecting the bubbles, so that counting accumulation is generated;
(3) when the ultrasonic bubble detection device does not send a bubble signal any more, a reverse current is introduced to the electromagnet coil, the directions of two magnetic poles of the electromagnet are changed, the sliding magnetic ring slides downwards to drive the pull rod to extend, the petal-shaped sampler is started to prepare for next sampling; if necessary, multiple sampling counts are performed.
9. The method as claimed in claim 8, wherein the electromagnet is disposed above the sliding magnetic ring, the coil of the electromagnet is energized, the magnetic pole at the lower end of the electromagnet is different from the upper end of the sliding magnetic ring in magnetism, an attraction force is generated, the sliding magnetic ring slides upwards to drive the pull rod to contract, and the petal-shaped sampler is closed; after the electromagnet is electrified with reverse current, the lower end of the electromagnet has the same magnetism as the upper end of the sliding magnetic ring to generate repulsive force, the sliding magnetic ring slides downwards to drive the pull rod to extend, and the petal-shaped sampler is started.
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| CN202011140674.3A CN112257839B (en) | 2020-10-22 | 2020-10-22 | Seabed methane bubble counting device and method |
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| CN113175951A (en) * | 2021-03-23 | 2021-07-27 | 浙江大学 | Deep sea hydrate in-situ three-dimensional monitoring system |
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