CN116101430A - Liquid tank oscillation system for LNG filling ship, oscillation flow and control method - Google Patents
Liquid tank oscillation system for LNG filling ship, oscillation flow and control method Download PDFInfo
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- CN116101430A CN116101430A CN202310332811.0A CN202310332811A CN116101430A CN 116101430 A CN116101430 A CN 116101430A CN 202310332811 A CN202310332811 A CN 202310332811A CN 116101430 A CN116101430 A CN 116101430A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
- B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
- B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
- B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a liquid tank oscillation system, an oscillation process and a control method for an LNG filling ship, which comprise a liquid tank, wherein a liquid level detector and a data processor are fixed in the liquid tank, two sides of the liquid tank are symmetrically provided with oscillation plates, the oscillation plates on two sides are respectively connected with the liquid tank through a plurality of connecting devices, the tail end of each connecting device is provided with a pressure sensor, and the data processor is in control connection with the liquid level detector, the pressure sensor and the connecting devices. When the oscillation plate is impacted by liquefied natural gas in the liquid cabin, the hydraulic rod adjusts the hydraulic damping strength to allow the oscillation plate to reciprocate along with the oscillation of the liquid cabin, so that the impact caused by the oscillation of the liquid is absorbed, the angle of the oscillation plate is automatically adjusted according to the data measured by the sensor, the effective oscillation area of the oscillation plate is increased, the stress generated by the oscillation impact of the oscillation plate can be reduced by arranging the transverse and longitudinal baffle plates on the oscillation plate, and the stability of a system is improved; and (5) timely adjusting according to the real-time change of the liquid level in the liquid tank and the sloshing degree of the ship body.
Description
Technical Field
The invention relates to a swing system and a control method, in particular to a liquid tank swing system, a swing process and a control method for an LNG filling ship.
Background
LNG is a highly efficient and clean source of energy, commonly known as liquefied natural gas. In recent years, under the large trend of energy conservation and emission reduction of ship industry in China, the development of LNG ships has a good prospect rapidly. Because the large-scale liquid tanks are arranged in the ship cabin, the ship inevitably generates a working condition that the liquid cabin is not fully loaded, so that free liquid level exists in the liquid cabin, and the swing of the liquefied natural gas in the cabin causes sloshing. When the external excitation frequency is similar to the natural vibration frequency of the tank, the tank can be subjected to strong swing even under a small excitation amplitude, so that the hull structure is damaged, and even the stability of the hull structure can be influenced, so that serious accidents are caused. Therefore, it is necessary to use a sloshing device to reduce the risk of sloshing of the LNG tank.
At present, the development of LNG liquid tank oscillation making equipment is still in the primary stage, engineering application level is lower, and conventional oscillation making measures are that a bulkhead or a diaphragm is additionally arranged in the liquid tank, but the defects are that: the requirements on the structural strength of the ship body are high, and the swinging effect is general; along with the operation of the filling ship, the liquid level in the liquid tank gradually descends, and the current oscillation making equipment cannot timely adjust according to the real-time working condition of the filling ship, so that the oscillation making effect is not ideal; when the ship is in the filling operation, the conventional oscillating plate can not effectively reduce the impact caused by the transverse oscillation of the liquefied natural gas in the liquid tank.
Disclosure of Invention
The invention aims to: the invention aims to provide a liquid tank oscillation system, an oscillation flow and a control method for an LNG filling ship, which can increase the effective oscillation area of an oscillation plate; the stress generated by the oscillation impact of the oscillation plate can be reduced, and the stability of the system is improved.
The technical scheme is as follows: the invention comprises a liquid tank, wherein a liquid level detector and a data processor are fixed in the liquid tank, the two sides of the liquid tank are symmetrically provided with the oscillating plates, the oscillating plates at the two sides are respectively connected with the liquid tank through a plurality of connecting devices, the tail end of each connecting device is provided with a pressure sensor, and the data processor is in control connection with the liquid level detector, the pressure sensor and the connecting devices.
The device is characterized in that a plurality of horizontal partition plates and vertical partition plates are arranged on the oscillation plate, the oscillation plate is divided into a plurality of small spaces by the horizontal partition plates and the vertical partition plates, and each small space of the oscillation plate is provided with a through hole.
The through holes are conical holes, and the opening directions of the conical holes are distributed in a staggered manner along the vertical direction.
The connecting device is a hydraulic control rod, and a cylinder body of the hydraulic control rod positioned on the same side of the liquid tank is in sliding connection with a bracket arranged in the side liquid tank.
The piston rods in the hydraulic control rods are connected with the oscillating plate through universal heads, so that the oscillating plate can move back and forth in the liquid tank under the pushing of a plurality of hydraulic control rods and can deflect in the transverse and longitudinal directions.
The data processor is symmetrically arranged on two sides of the liquid tank, the input end of the data processor is respectively connected with the output end of the liquid level detector and the output end of the pressure sensor, and the output end of the data processor is connected with the control end of the hydraulic control rod positioned on the same side of the liquid tank.
A swing flow for a tank swing system for an LNG refueling vessel, comprising the steps of:
1) Installing the oscillation system;
2) The liquid level detector detects the liquid level height in the liquid tank and adjusts the position of the oscillating plate relative to the liquid tank according to the liquid level height;
3) The pressure sensor detects the pressure value on the surface of the oscillating plate, and adjusts the expansion and contraction amount of the hydraulic control rod again according to the pressure value, so as to control the deflection direction and angle of the oscillating plate;
4) The pressure sensor detects the pressure value of the surface of the swinging plate after the swinging plate deflects, and the damping strength of the hydraulic control rod is regulated again according to the pressure value;
5) Repeating the steps 2) to 4) until the liquid level sloshing height in the liquid tank reaches the minimum value.
A method of controlling a tank swing system for an LNG refueling vessel, comprising:
when the liquid tank is fully loaded, the data processor controls the expansion and contraction amount of the hydraulic control rod at the corresponding side to enable the expansion and contraction amount of the hydraulic control rod to be the same, at the moment, the oscillation plate is perpendicular to the surface of the liquid tank, and the damping size of the hydraulic control rod is adjusted according to data measured by the pressure sensor to enable the oscillation plate to periodically shake with the free liquid level in the liquid cabin;
when the liquid tank is in a non-full load state, the data processor controls the expansion and contraction amount of the hydraulic control rod at the corresponding side, so that the oscillation plate longitudinally deflects around the central shaft while moving, the immersion area of the oscillation plate is increased, and the data processor adjusts the damping size of the hydraulic rod according to data measured by the pressure sensor, so that the oscillation plate periodically shakes along with the free liquid level in the liquid cabin;
when the filling ship is under the filling working condition, the single-side hydraulic rod expansion and contraction quantity is controlled by the liquid level height and liquid pressure data processor detected by the liquid level detector and the pressure sensor, so that the oscillating plate transversely deflects around the central shaft, and the damping size of the hydraulic control rod is adjusted according to data measured by the pressure sensor, so that the oscillating plate periodically shakes along with the free liquid level in the liquid cabin.
The beneficial effects are that:
(1) When the oscillation plate is impacted by liquefied natural gas in the liquid cabin, the hydraulic rod adjusts hydraulic damping strength to allow the oscillation plate to reciprocate along with the oscillation of the liquid cabin, impact caused by the oscillation of the liquid is absorbed, the angle of the oscillation plate is automatically adjusted according to data measured by the sensor, the effective oscillation area of the oscillation plate is increased, the arrangement of transverse and longitudinal baffle plates on the oscillation plate can reduce stress generated by the oscillation impact of the oscillation plate, and the stability of a system is improved;
(2) The liquid level in the liquid tank and the real-time change of the ship body sloshing degree can be timely adjusted, the liquid level height in the liquid tank sloshing process is guaranteed to be the lowest value to the greatest extent, the sloshing effect can be greatly improved, and further damage to the bulkhead caused by the liquid tank sloshing is effectively reduced.
Drawings
FIG. 1 is an overall block diagram of the present invention;
FIG. 2 is a schematic diagram of an oscillator plate according to the present invention;
FIG. 3 is a diagram of an aperture structure of an oscillator plate of the present invention;
FIG. 4 is a partial cross-sectional view of the oscillation system of the present invention in a non-fully loaded state;
FIG. 5 is a partial cross-sectional view of the oscillation system of the present invention in a ship roll condition;
fig. 6 is a control block diagram of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 to 5, the invention comprises a liquid tank 1, a liquid level detector 2, an oscillation plate 3, a pressure sensor 4, a data processor 5 and a hydraulic control rod 6, wherein the liquid tank 1 adopts a C-shaped liquid tank, the liquid level detector 2 is positioned at the top of the liquid tank 1 and is fixedly connected with the liquid tank for detecting the change condition of the liquid level in the liquid tank in real time, and the liquid level detector 2 is preferably a radar type liquid level detector. The left side and the right side of the liquid tank 1 are symmetrically provided with the oscillating plates 3, the oscillating plates 3 on the two sides are respectively fixed with the liquid tank 1 through a plurality of hydraulic control rods 6, the hydraulic control rods 6 are magnetorheological hydraulic rods, and the peripheral side walls of the oscillating plates 3 are spaced from the inner wall of the liquid tank 1, so that the position of the oscillating plates 3 can be conveniently adjusted. The pressure sensor 4 is fixedly arranged at the tail end of the hydraulic control rod 6, and the cylinder bodies of the hydraulic control rods 6 positioned at the same side are all in sliding connection with the support 7 arranged in the liquid tank 1, so that the hydraulic control rods 6 can move in the fixed track of the support 7 under the control of the data processor 5. The piston rod in each hydraulic control rod 6 is connected with the oscillation plate 3 through a universal head, the oscillation plate 3 can move back and forth in the liquid tank and deflect in the transverse and longitudinal directions under the pushing of a plurality of hydraulic control rods 6, and then the adjustment of the oscillation plate 3 relative to the liquid level of the liquefied natural gas in the liquid tank 1 is realized. The data processor 5 is symmetrically arranged at two sides of the liquid tank 1, the input end of the data processor 5 is respectively connected with the output end of the liquid level detector 2 and the output end of the pressure sensor 4, and the output end of the data processor 5 is connected with the control end of the hydraulic control rod 6 positioned at the same side of the liquid tank 1.
As shown in fig. 2, the oscillator plate 3 is provided with a plurality of horizontal splitter plates 32 and vertical splitter plates 33, the oscillator plate 3 is divided into a plurality of small spaces by the horizontal splitter plates 32 and the vertical splitter plates 33, the oscillator plate 3 in each small space is provided with a through hole 31, the through holes 31 are conical holes, and the opening directions of the conical holes are distributed in a staggered manner along the vertical direction, as shown in fig. 3. The oscillating plate 3 can move along the radial direction of the liquid tank 1, so when the oscillating plate 3 is impacted by liquefied natural gas in the liquid tank 1, the hydraulic rod adjusts hydraulic damping strength to allow the oscillating plate 3 to reciprocate along with the oscillation of the liquid tank 1, impact caused by the oscillation of the liquid is absorbed, the angle of the oscillating plate 3 is automatically adjusted according to data measured by the pressure sensor, and the effective oscillation area of the oscillating plate 3 is increased.
The arrangement of the transverse and longitudinal partition plates on the oscillation plate 3 can reduce the stress generated by the oscillation impact of the oscillation plate 3 and improve the stability of the oscillation plate 3. When the liquid tank 1 shakes to generate energy, the conical holes can more effectively absorb the energy brought by liquid impact, and the energy is released inside, so that the energy generated by shaking is timely dissipated through the oscillating plate 3 and the hydraulic control rod 6, the harm to the liquid tank component caused by the liquid tank shaking is greatly reduced, and the safety and stability of the inside of the tank body are ensured.
As shown in fig. 6, the data processor 5 includes a data receiving module 51, a data processing module 52, and a current control module 53, where an input end of the data receiving module 51 is connected to an output end of the liquid level detector 2 and an output end of the pressure sensor 4, an input end of the data processing module 52 is connected to an output end of the data receiving module 51, an input end of the current control module 53 is connected to an output end of the data processing module 52, and an output end of the current control module 53 is connected to a control end of each hydraulic control lever 6. The data receiving module 51 receives the liquid level height information and the liquid level pressure information sent by the liquid level detector 2 and the pressure sensor 4 respectively, and sends the received liquid level height information and liquid level pressure information to the data processing module 52, the data processing module 52 converts the expansion amount and the corresponding required current of the corresponding hydraulic control rod 6 according to the liquid level height information and the liquid level pressure information, and the current control module 53 sends the required current to the hydraulic control rod 6, so that the hydraulic control rod 6 can adjust the oscillation plate 3.
When the hydraulic control system is used, the data processor 5 drives the hydraulic control rod 6 to move according to the liquid level height detected by the liquid level detector 2 and the pressure detected by the pressure sensor 4 and the pressure born by the oscillator plate 3, so that the oscillator plate 3 is subjected to position adjustment, and the coarse adjustment of the position of the oscillator plate 3 in the liquid tank 1 is completed; then, the data processor 5 controls the hydraulic control rod 6 to move again according to the real-time liquid level pressure information detected by the pressure sensor 4, drives the oscillating plate 3 to perform angle deflection, and finishes fine adjustment of the position of the oscillating plate 3 in the liquid tank 1; finally, the hydraulic damping strength of the hydraulic control rod 6 is adjusted, so that the safety risk caused by the sloshing of the liquid tank is reduced to the minimum.
The specific oscillation control flow is as follows:
1) The middle part in the liquid cabin is provided with an oscillating plate which can move left and right relative to the liquid cabin;
2) The liquid level detector detects the liquid level height in the liquid tank and adjusts the position of the oscillating plate relative to the liquid tank according to the liquid level height;
3) The pressure sensor detects the pressure value on the surface of the oscillating plate, and adjusts the expansion and contraction amount of the hydraulic control rod again according to the pressure value so as to control the deflection direction and angle of the oscillating plate;
4) The pressure sensor detects the pressure value of the surface of the swinging plate after the swinging plate deflects, and the damping strength of the hydraulic control rod is regulated again according to the pressure value;
5) Repeating the steps 2) to 4) until the liquid level sloshing height in the liquid tank reaches the minimum value.
Due to the arrangement of the liquid level detector and the pressure sensor, the liquid level height and the liquid level pressure in the liquid tank can be detected in real time, so that the timely adjustment of the oscillating plate can be ensured according to the liquid level height and the pressure surface pressure change in the liquid tank, the sloshing phenomenon of the liquid tank can be timely eliminated, and the damage to the bulkhead is avoided.
The control method of the liquid oscillation plate can realize the control of liquid oscillation according to the reserve of liquefied natural gas in the liquid tank and the ship filling working condition, and comprises the following steps:
when the liquid tank is nearly fully loaded, the maximum bearing capacity of the liquid tank is 90% of the volume due to the characteristic of liquefied natural gas, a certain pressure space is reserved, and at the moment, the data processor controls the expansion and contraction amount of the hydraulic rod, so that the expansion and contraction amount of the hydraulic rod is the same, and the swinging plate is perpendicular to the surface of the liquid tank. The damping of the hydraulic control rod is regulated according to the data measured by the pressure sensor, so that the oscillation plate periodically oscillates along with the free liquid level of the liquefied natural gas, most of attack force on the liquid tank caused by liquid oscillation is absorbed, and the oscillation aim is realized;
as shown in fig. 4, when the liquid tank is in a non-full load state, the data processor controls the expansion and contraction amount of the hydraulic rod at the corresponding side, so that the oscillation plate can move left and right and can longitudinally deflect around the central shaft in a certain range, the immersed area of the oscillation plate is increased, the oscillation effective area is maximized, the data processor adjusts the damping size of the hydraulic rod according to data measured by the pressure sensor, the oscillation plate periodically shakes along with the free liquid level of the liquefied natural gas, and the impact force on the liquid tank caused by liquid oscillation is absorbed for the most part, so that the oscillation control purpose is realized.
As shown in fig. 5, when the LNG filling ship is in a filling working condition, the ship is easy to roll, the single-side hydraulic rod expansion and contraction amount is controlled by the liquid level height and liquid pressure data processor detected by the liquid level detector and the pressure sensor, so that the oscillation plate transversely deflects around the central shaft in a certain range, the oscillation plate simultaneously counteracts the oscillation caused by the rolling of the ship body, the damping size of the hydraulic control rod is regulated according to the data measured by the pressure sensor, the oscillation plate periodically shakes along with the free liquid level of the liquefied natural gas, and most of the impact force on the liquid tank caused by the liquid oscillation is absorbed, so that the oscillation aim is realized.
The system is used for improving the effectiveness of the liquid tank oscillation system, and is also provided with a marine GPS (global positioning system) positioner, a marine electronic inclinometer, a marine meteorological instrument, a navigation depth finder and a stress sensor; the output end of the marine GPS locator, the output end of the marine electronic inclinometer, the output end of the marine weather instrument, the output end of the marine sounding instrument and the output end of the stress sensor are all connected with the input end of the data processor 5. The data processor 5 can collect real-time stress state information of key nodes of the LNG liquid tank through the stress sensor by collecting information of a marine GPS (Global positioning System) locator, a marine electronic inclinometer, a marine weather instrument, a marine sounding instrument and the like, and through cloud computing, big data analysis is carried out through different adjustment states of the oscillation plate, so that automatic control of the free liquid level of the liquid tank is achieved according to the characteristics of loaded liquid, the route path, the sailing sea condition and the like, and damage and loss of the ship caused by oscillation of the liquid tank are reduced to the greatest extent.
Claims (8)
1. A liquid tank oscillation system for LNG filling ship, its characterized in that includes the liquid tank, be fixed with liquid level detector and data processor in the liquid tank, the oscillating plate is installed to liquid tank bilateral symmetry, and the oscillating plate of both sides is connected with the liquid tank through a plurality of connecting device respectively, and every connecting device's end all is equipped with pressure sensor, data processor and liquid level detector, pressure sensor and connecting device control connection.
2. The tank oscillation system for LNG refueling vessels as recited in claim 1, wherein the oscillation plates are provided with a plurality of horizontal and vertical separation plates, which divide the oscillation plates into a plurality of small spaces, each of which is provided with a through hole.
3. Tank oscillation system for LNG tankers according to claim 2, characterized in that the through holes are conical holes, and that the opening directions of the conical holes are staggered in the vertical direction.
4. Tank oscillation system for LNG tankers according to claim 1, characterized in that the connection means are hydraulic control rods, the cylinders of which are located on the same side of the tank and the brackets provided in the side tanks are slidingly connected.
5. Tank oscillation system for LNG tankers according to claim 4, characterized in that the piston rod in the hydraulic control lever is in rotational connection with the oscillation plate.
6. Tank oscillation system for LNG tankers according to claim 1, characterized in that the data processor is arranged symmetrically on both sides of the tank, the input of which is connected with the output of the level detector and the output of the pressure sensor, respectively, and the output of the data processor is connected with the control end of the hydraulic control lever on the same side of the tank.
7. A swing procedure for a tank swing system for LNG tankers according to any one of claims 1 to 6, characterised by the steps of:
1) Installing the oscillation system;
2) The liquid level detector detects the liquid level height in the liquid tank and adjusts the position of the oscillating plate relative to the liquid tank according to the liquid level height;
3) The pressure sensor detects the pressure value on the surface of the oscillating plate, and adjusts the expansion and contraction amount of the hydraulic control rod again according to the pressure value, so as to control the deflection direction and angle of the oscillating plate;
4) The pressure sensor detects the pressure value of the surface of the swinging plate after the swinging plate deflects, and the damping strength of the hydraulic control rod is regulated again according to the pressure value;
5) Repeating the steps 2) to 4) until the liquid level sloshing height in the liquid tank reaches the minimum value.
8. A method of controlling a tank swing system for an LNG refueling vessel according to any of claims 1 to 6, comprising:
when the liquid tank is fully loaded, the data processor controls the expansion and contraction amount of the hydraulic control rod at the corresponding side to enable the expansion and contraction amount of the hydraulic control rod to be the same, at the moment, the oscillation plate is perpendicular to the surface of the liquid tank, and the damping size of the hydraulic control rod is adjusted according to data measured by the pressure sensor to enable the oscillation plate to periodically shake with the free liquid level in the liquid cabin;
when the liquid tank is in a non-full load state, the data processor controls the expansion and contraction amount of the hydraulic control rod at the corresponding side, so that the oscillation plate longitudinally deflects around the central shaft while moving, the immersion area of the oscillation plate is increased, and the data processor adjusts the damping size of the hydraulic rod according to data measured by the pressure sensor, so that the oscillation plate periodically shakes along with the free liquid level in the liquid cabin;
when the filling ship is under the filling working condition, the single-side hydraulic rod expansion and contraction quantity is controlled by the liquid level height and liquid pressure data processor detected by the liquid level detector and the pressure sensor, so that the oscillating plate transversely deflects around the central shaft, and the damping size of the hydraulic control rod is adjusted according to data measured by the pressure sensor, so that the oscillating plate periodically shakes along with the free liquid level in the liquid cabin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310332811.0A CN116101430A (en) | 2023-03-31 | 2023-03-31 | Liquid tank oscillation system for LNG filling ship, oscillation flow and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310332811.0A CN116101430A (en) | 2023-03-31 | 2023-03-31 | Liquid tank oscillation system for LNG filling ship, oscillation flow and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116101430A true CN116101430A (en) | 2023-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310332811.0A Pending CN116101430A (en) | 2023-03-31 | 2023-03-31 | Liquid tank oscillation system for LNG filling ship, oscillation flow and control method |
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| Country | Link |
|---|---|
| CN (1) | CN116101430A (en) |
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2023
- 2023-03-31 CN CN202310332811.0A patent/CN116101430A/en active Pending
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