CN111254894B - Bubble curtain sewage discharge system and control method thereof - Google Patents

Bubble curtain sewage discharge system and control method thereof Download PDF

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Publication number
CN111254894B
CN111254894B CN202010152659.4A CN202010152659A CN111254894B CN 111254894 B CN111254894 B CN 111254894B CN 202010152659 A CN202010152659 A CN 202010152659A CN 111254894 B CN111254894 B CN 111254894B
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module
bubble curtain
bubble
exhaust hole
speed
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CN111254894A (en
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向宏
程以炫
危卫
伍骏
陈熙宇
汪望明
李智
赵宁
张登泰
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CCCC Guangzhou Dredging Co Ltd.
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CCCC Guangzhou Dredging Co Ltd.
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02BHYDRAULIC ENGINEERING
    • E02B15/00Cleaning or keeping clear the surface of open water; Apparatus therefor
    • E02B15/04Devices for cleaning or keeping clear the surface of open water from oil or like floating materials by separating or removing these materials
    • E02B15/06Barriers therefor construed for applying processing agents or for collecting pollutants, e.g. absorbent
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F5/00Dredgers or soil-shifting machines for special purposes
    • E02F5/28Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways

Abstract

The invention relates to a bubble curtain pollution discharge system and a control method, which comprise a bubble curtain generating pipe with an exhaust hole, a high-pressure gas supply device for conveying high-pressure gas to the bubble curtain generating pipe, a first acquisition module for acquiring the gas speed at the exhaust hole, a second acquisition module for acquiring the water flow speed, a control module electrically connected with the first acquisition module and the second acquisition module, and an adjusting module for adjusting the flow of the high-pressure gas, wherein the adjusting module is electrically connected with the control module. In the operation process, acquire exhaust hole department gas discharge speed and velocity of water flow through first collection module, second collection module in real time, control module handles the data of gathering and controls adjusting module and carries out work, and this system can realize real time monitoring, makes the control of system more accurate to can be according to the velocity of water flow adjustment bubble curtain emergence pipe's of equidimension gas discharge speed, be adapted to the pollution discharge separation operation under the ocean current or river speed environment of equidimension not.

Description

Bubble curtain sewage discharge system and control method thereof
Technical Field
The invention relates to the technical field of dredging and sewage discharge, in particular to a bubble curtain sewage discharge system and a control method of the bubble curtain sewage discharge system.
Background
The traditional dredging construction can cause the suspended matters deposited in the surrounding water area to be diffused in water and even float on the water surface, thereby causing great pollution to the environment. In order to respond to national ecological environment protection laws and regulations, the problem of serious dredging pollution is urgently solved. The bubble curtain pipeline can play a certain blocking effect on the diffusion of surrounding suspended matters in the dredging operation process, allows ships and equipment to freely move on the bubble curtain and can block suspended matters. However, in the dredging engineering, the environmental protection dredging using the antifouling system is still in the starting stage, and for the research on the lack of specific antifouling system and antifouling property, the existing bubble curtain pollution discharge device can not be monitored and controlled in real time, and can not be suitable for pollution discharge blocking operation under the environments of ocean currents or river velocities with different sizes.
Disclosure of Invention
The invention aims to provide a bubble curtain sewage discharge system and a control method of the bubble curtain sewage discharge system, which can realize real-time monitoring and can also adapt to sewage discharge blocking operation in ocean current or river speed environments with different sizes.
In order to realize the purpose of the invention, the technical scheme is as follows:
the utility model provides a bubble curtain drainage, is including opening the bubble curtain that has the exhaust hole and taking place the pipe, be used for to the bubble curtain take place the pipe carry high-pressure gas's high-pressure gas supply arrangement, be used for gathering the first collection module of exhaust hole department gas velocity, be used for gathering the second collection module of water velocity, with first collection module and second collection module electric connection's control module, and be used for adjusting high-pressure gas flow's regulating module, regulating module and control module electric connection.
This bubble curtain drainage is at the operation in-process, through first collection module, second collection module acquires exhaust hole department gas discharge speed and velocity of water flow in real time, and send the data transmission who gathers to control module, control module handles received data, and judge whether the gas discharge speed of current exhaust hole department meets the demands, if unsatisfied the demands, then send signal for adjusting module, adjust high-pressure gas flow, increase or reduce the high-pressure gas flow to bubble curtain generating tube transport, thereby improve or reduce the gas discharge speed of exhaust hole department, ensure the separation effect, prevent to become invalid. The bubble curtain sewage discharge system can realize real-time monitoring, so that the system is more accurately controlled, and the gas discharge speed of the bubble curtain generating pipe can be adjusted according to the water flow speeds of different sizes, so that the bubble curtain sewage discharge system is suitable for sewage discharge blocking operation in ocean current or river speed environments of different sizes.
The technical scheme is further explained as follows:
further, the bubble curtain drainage system further comprises a third acquisition module for acquiring the flow of the high-pressure gas, and the third acquisition module is electrically connected with the control module. The high-pressure gas flow in the pipeline is monitored in real time through the third acquisition module, so that the control of the system is more accurate.
Further, a communicating pipe is connected between the bubble generating pipe and the high-pressure gas supply device, the third acquisition module and the adjusting module are both connected to the communicating pipe, and the third acquisition module is arranged between the adjusting module and the high-pressure gas supply device.
Further, the bubble curtain sewage system further comprises a fourth acquisition module for acquiring the pressure of the communicating pipe and a fifth acquisition module for acquiring the pressure of the bubble generating pipe, and the fourth acquisition module and the fifth acquisition module are both electrically connected with the control module. The accuracy of system control is further improved.
Further, the bubble curtain sewage system further comprises a display module for displaying each acquired data and an input module for inputting the data, and the display module and the input module are both electrically connected with the control module. The data collected by the system are observed in real time through the display module, so that observation and judgment are facilitated, and the data can be input through the input module, so that the system is convenient to set and control.
Further, the bubble curtain drainage system further comprises computer equipment, and the computer equipment comprises a control module, a display module and an input module.
Further, the direction of placing of bubble curtain emergence pipe is arranged with the rivers direction is perpendicular, and bubble curtain emergence pipe has a plurality of exhaust holes along its self axis direction interval arrangement, and the opening in exhaust hole is towards the surface of water, and the one end of bubble curtain emergence pipe is the inlet end, and the other end is sealed to be set up, and the inlet end is used for inserting high-pressure gas, and the interval between two adjacent exhaust holes is diminished to the other end by the inlet end in proper order. The interval between two adjacent exhaust holes is diminished to the other end by the inlet end in proper order, improves the homogeneity of exhaust hole outlet flow, makes the gas velocity of flow at each exhaust hole roughly the same, makes the bubble curtain that produces form an even diaphragm, strengthens fluidic disturbance in the flow direction, strengthens the exchange process of fluid quality and energy, improves the separation effect.
Furthermore, the total number of the exhaust holes is N, the serial numbers of the exhaust holes are 1 to N from the air inlet end to the other end in sequence, and the distance between the nth exhaust hole and the (N + 1) th exhaust hole
Figure BDA0002402992260000031
Wherein N is more than or equal to 1 and less than N, N and N are natural numbers, and C is the distance between the 1 st exhaust hole and the 2 nd exhaust hole. The distance between two adjacent exhaust holes is attenuated from the air inlet end to the other end in sequence according to the formula, so that the uniformity of the outlet flow of the exhaust holes is further improved, and the blocking effect is improved.
The invention also provides a control method of the bubble curtain sewage system, which comprises the following steps:
setting the size of the vent holes of the bubble curtain generating tube and the distance between two adjacent vent holes;
acquiring the water flow velocity of a dredging construction water area and the gas velocity at an exhaust hole of a bubble curtain generating pipe, and judging whether the gas velocity is within a preset range;
if the gas speed deviates from the preset range, the control module outputs a signal to start the adjusting module, and the high-pressure gas flow conveyed to the bubble generating pipe is controlled until the gas speed is controlled within the preset range.
This bubble curtain drainage system is at the operation in-process, acquire exhaust hole department gas discharge speed and water velocity, and with the data transmission to control module who gathers, control module handles received data, and judge whether current exhaust hole department's gas discharge speed is in the within range of predetermineeing, if unsatisfied the requirement, then send the signal for adjusting module, adjust high-pressure gas flow, increase or reduce the high-pressure gas flow to bubble curtain emergence pipe transport, thereby improve or reduce the gas discharge speed of exhaust hole department, ensure the separation effect, prevent the inefficacy. The bubble curtain sewage discharge system can realize real-time monitoring, the system is controlled more accurately, the gas discharge speed of the bubble curtain generating pipe can be adjusted according to the water flow speeds of different sizes, and the bubble curtain sewage discharge system is suitable for sewage discharge blocking operation in ocean current or river speed environments of different sizes
Further, if the diameter of the vent hole is 0.2mm or 1mm and the water flow speed is 0.01m/s, the preset range is 1 +/-0.1 m/s or 4 +/-0.1 m/s; if the diameter of the exhaust hole is 0.2mm or 1mm and the water flow speed is 0.05m/s, the preset range is 4 +/-0.1 m/s. When the bubble curtain sewage system is in different environments, the gas speed is controlled in different preset ranges, and the blocking effect of the system is greatly improved.
Compared with the prior art, the invention has the following beneficial effects:
in the operation process, the first acquisition module and the second acquisition module acquire the gas discharge speed and the water flow speed at the exhaust hole in real time and send the acquired data to the control module, the control module processes the received data and judges whether the current gas discharge speed at the exhaust hole meets the requirement, if not, a signal is sent to the adjusting module to adjust the high-pressure gas flow and increase or decrease the high-pressure gas flow conveyed to the bubble curtain generating pipe, so that the gas discharge speed at the exhaust hole is increased or decreased, the blocking effect is ensured, and the failure is prevented. The bubble curtain sewage discharge system can realize real-time monitoring, so that the system is more accurately controlled, and the gas discharge speed of the bubble curtain generating pipe can be adjusted according to the water flow speeds of different sizes, so that the bubble curtain sewage discharge system is suitable for sewage discharge blocking operation in ocean current or river speed environments of different sizes.
Drawings
FIG. 1 is a schematic structural diagram of a bubble curtain drainage system according to an embodiment of the invention;
FIG. 2 is a schematic diagram of the arrangement of the air vent holes of the bubble curtain generating tube according to the embodiment of the present invention.
Description of reference numerals:
10. the system comprises a high-pressure gas supply device, 20, a bubble curtain generating pipe, 210, an exhaust hole, 220, an air inlet end, 310, a first acquisition module, 320, a second acquisition module, 330, a third acquisition module, 340, a fourth acquisition module, 350, a fifth acquisition module, 40, computer equipment, 410, a control module, 420, a display module, 430, an input module, 440, a storage medium, 50, an adjusting module, 60, a communication pipe, 70, a tensioner and 80 water level.
Detailed Description
Embodiments of the present invention are described in detail below with reference to the accompanying drawings:
as shown in fig. 1 to 2, a bubble curtain drainage system comprises a bubble curtain generation tube 20 with vent holes 210, a high-pressure gas supply device 10 for supplying high-pressure gas to the bubble curtain generation tube 20, a first collection module 310 for collecting gas velocity at the vent holes 210, a second collection module 320 for collecting water velocity, a control module 410 electrically connected with the first collection module 310 and the second collection module 320, and an adjustment module 50 for adjusting high-pressure gas flow, wherein the adjustment module 50 is electrically connected with the control module 410, the electrical connection can be wireless connection or wired connection, and different electrical connection modes are selected according to actual needs.
This bubble curtain drainage is at the operation in-process, through first collection module 310, second collection module 320 acquires exhaust hole 210 department gas discharge speed and water velocity in real time, and send the data of gathering to control module 410, control module 410 handles the data received, and judge whether current exhaust hole 210 department's gas discharge speed meets the demands, if unsatisfied the demands, then send signal for adjusting module 50, adjust high-pressure gas flow, increase or reduce the high-pressure gas flow to bubble curtain generating tube 20 transport, thereby improve or reduce the gas discharge speed of exhaust hole 210 department, ensure bubble curtain separation effect, prevent the failure. The bubble curtain sewage discharge system can realize real-time monitoring, so that the system is more accurately controlled, and the gas discharge speed of the bubble curtain generating pipe 20 can be adjusted according to the water flow speeds of different sizes, so that the bubble curtain sewage discharge system is suitable for sewage discharge blocking operation in ocean current or river speed environments of different sizes.
In this embodiment, the first collection module 310 is a wireless communication conductance probe, the second collection module 320 is a current meter, the adjustment module 50 is a flow control valve, and the first collection module 310, the second collection module 320 and the adjustment module 50 may also adopt other forms according to actual needs.
As shown in fig. 1, the control module 410 is integrated in the computer device 40, the computer device 40 further includes a display module 420 for displaying each collected data and an input module 430 for inputting data, and both the display module 420 and the input module 430 are electrically connected to the control module 410. The data collected by the system can be observed in real time through the display module 420, so that the observation and judgment are convenient, and the data can be input through the input module 430, so that the setting and the control of the system are convenient.
The computer arrangement 40 further comprises a storage medium 440, the storage medium 440 having a program stored thereon, the program being executed to perform a method of controlling a bubble curtain drainage system. The control method comprises the following steps:
the size of the exhaust holes 210 of the bubble curtain generating tube 20 and the distance between two adjacent exhaust holes 210 are set through the input module 430;
acquiring the water flow velocity of a dredging construction water area and the gas velocity at the exhaust holes 210 of the bubble curtain generating tube 20, and judging whether the gas velocity is in a preset range;
if the gas velocity deviates from the preset range, the control module 410 outputs a signal to start the adjustment module 50, and controls the flow of the high-pressure gas to the bubble generation tube until the gas velocity is controlled within the preset range.
In the present embodiment, the preset range of the gas velocity is set as follows:
the first condition is as follows: if the diameter of the vent hole 210 is 0.2mm and the water flow speed is 0.01m/s, the preset range of the gas speed is 1m/s or 4m/s, when the bubble curtain sewage system is in the environment, the gas speed is controlled in the preset range, the blocking effect of the system is improved to the maximum extent, and the preset range can be set to be 1 +/-0.1 m/s or 4 +/-0.1 m/s according to the actual situation;
case two: if the diameter of the vent hole 210 is 1mm and the water flow speed is 0.01m/s, the preset range of the gas speed is 1m/s or 4m/s, when the bubble curtain sewage system is in the environment, the gas speed is controlled in the preset range, the blocking effect of the system is improved to the maximum extent, and the preset range can be set to be 1 +/-0.1 m/s or 4 +/-0.1 m/s according to the actual situation;
case three: if the diameter of the exhaust hole 210 is 0.2mm and the water flow speed is 0.05m/s, the preset range of the gas speed is 4m/s, when the bubble curtain sewage system is in the environment, the gas speed is controlled in the preset range, the blocking effect of the system is improved to the maximum extent, and the preset range can be set to be 4 +/-0.1 m/s according to the actual situation;
case four: if the diameter of the vent hole 210 is 1mm and the water flow speed is 0.05m/s, the preset range of the gas speed is 4m/s, when the bubble curtain sewage system is in the environment, the gas speed is controlled in the preset range, the blocking effect of the system is improved to the maximum extent, and the preset range can be set to be 4 +/-0.1 m/s according to the actual situation.
As shown in fig. 1 to 2, the placing direction of the bubble curtain generating tube 20 is perpendicular to the water flow direction, the tube body of the bubble curtain generating tube 20 is provided with a plurality of vent holes 210 along the axis direction thereof at intervals, the first collecting modules 310 are in one-to-one correspondence with the drain holes 210, the openings of the vent holes 210 face the water surface 80, one end of the bubble curtain generating tube 20 far away from the air inlet 220 is sealed, and the distance between two adjacent vent holes 210 is gradually reduced from the air inlet 220 to the other end. Place on the bed mud surface under water when bubble curtain generating tube 20 uses, the interval between two adjacent exhaust holes 210 diminishes to the other end in proper order by inlet end 220, improves the homogeneity of exhaust hole 210 export flow, makes the gas velocity of flow of each exhaust hole 210 department roughly the same, makes the bubble curtain of production form one even diaphragm, strengthens fluidic disturbance in the flow direction, strengthens fluid quality and energy exchange process, improves bubble curtain exhaust system's separation effect.
In the present embodimentAs shown in FIG. 2, the total number of the exhaust holes 210 is N, the number of the exhaust holes 210 is 1 to N from the inlet end 220 to the other end, and the distance between the nth exhaust hole 210 and the (N + 1) th exhaust hole 210 is set
Figure RE-GDA0002460359990000061
Wherein N is more than or equal to 1 and less than N, N and N are natural numbers, and C is the distance between the 1 st exhaust hole 210 and the 2 nd exhaust hole 210. The distance between two adjacent exhaust holes 210 is sequentially attenuated from the air inlet end 220 to the other end according to the formula, so that the uniformity of the outlet flow of the exhaust holes 210 is further improved, and the blocking effect is improved. Before construction, the length required by the bubble curtain is determined according to the size of a dredging construction area, an initial value C of the hole interval is selected, and the total number of the orifices and the interval between two adjacent exhaust holes 210 are determined. The interval between two adjacent exhaust holes 210 may also be sequentially attenuated according to other manners.
The central axes of all the exhaust holes 210 are positioned on the same plane, so that the generated bubble curtain is more concentrated and the effect is better. In addition, the shape of all the exhaust holes 210 is the same, in this embodiment, the shape of the exhaust hole 210 is circular, and the shape of the exhaust hole 210 may be set to be other shapes such as triangle, square, ellipse, etc. according to actual needs.
As shown in fig. 1, the bubble curtain drainage system further includes a third collecting module 330 for collecting the high-pressure gas flow, the third collecting module 330 is electrically connected to the control module 410, and the third collecting module 330 monitors the high-pressure gas flow in the pipeline in real time, so that the system is controlled more accurately. A connection pipe 60 is connected between the bubble generating tube and the high pressure gas supply apparatus 10, the third collecting module 330 and the adjusting module 50 are both connected to the connection pipe 60, and the third collecting module 330 is disposed between the adjusting module 50 and the high pressure gas supply apparatus 10.
In this embodiment, the third collecting module 330 is a gas mass flowmeter, and the third collecting module 330 may also take other forms according to actual needs.
As shown in fig. 1, the bubble curtain drainage system further includes a fourth collecting module 340 for collecting the pressure of the communicating pipe 60 and a fifth collecting module 350 for collecting the pressure of the bubble generating pipe, both the fourth collecting module 340 and the fifth collecting module 350 are electrically connected to the control module 410, and the adjusting module 5050 is precisely controlled according to the pressure of the two pipes, so that the accuracy of system control is further improved. The fourth collection module 340 is located above water and disposed between the high pressure gas supply device 10 and the adjustment module 50, and the fifth collection module 350 is located under water and disposed on the bubble curtain generating tube 20.
In this embodiment, the fourth collection module 340 and the fifth collection module 350 are both wireless pipeline pressure sensors, and the fourth collection module 340 and the fifth collection module 350 may also adopt other forms according to actual needs.
As shown in fig. 1, the high-pressure gas supply device 10 and the communication pipe 60, and the communication pipe 60 and the bubble curtain generating tube 20 are connected by flanges, so that the installation and the removal are facilitated. And the communicating pipe 60 and the bubble curtain generating pipe 20 are fixed at the water bottom by the tensioner 70, thereby improving the stability of the whole system.
In this embodiment, the body of bubble curtain generating tube 20 is flexible rubber hose, and communicating pipe 60 is then the plastics material, and plastic tubing and flexible rubber hose are all light in weight and anticorrosive, extension life, and the transportation of being convenient for is preserved. The body of the bubble curtain generating tube 20 and the communicating tube 60 may be made of other materials according to actual needs. The high-pressure gas supply device 10 is an air compressor, the air compressor is arranged on the land, and an emergency protection device and a grounding protection device are further arranged in a matched mode, so that the use is safer. The high-pressure gas supply device 10 may also take other forms according to actual needs.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A bubble curtain pollution discharge system is characterized by comprising a bubble curtain generating pipe with an exhaust hole, a high-pressure gas supply device for conveying high-pressure gas to the bubble curtain generating pipe, a first acquisition module for acquiring the gas speed at the exhaust hole, a second acquisition module for acquiring the water flow speed, a control module which is electrically connected with the first acquisition module and the second acquisition module and is used for judging whether the gas discharge speed at the exhaust hole meets the requirement or not, and an adjusting module for adjusting the high-pressure gas flow, wherein the adjusting module is electrically connected with the control module; the bubble curtain sewage discharge system can realize real-time monitoring and adjust the gas discharge speed of the bubble curtain generating pipe according to the water flow speeds of different sizes, and is suitable for sewage discharge blocking operation in ocean current or river speed environments of different sizes.
2. The bubble curtain drainage system of claim 1, further comprising a third collection module for collecting a flow of high-pressure gas, the third collection module being electrically connected to the control module.
3. The bubble curtain drainage system as claimed in claim 2, wherein a communicating pipe is connected between the bubble generating tube and the high-pressure gas supply device, the third collecting module and the adjusting module are both connected to the communicating pipe, and the third collecting module is disposed between the adjusting module and the high-pressure gas supply device.
4. The bubble curtain drainage system according to claim 3, further comprising a fourth collecting module for collecting the pressure of the communicating pipe and a fifth collecting module for collecting the pressure of the bubble generating pipe, wherein the fourth collecting module and the fifth collecting module are both electrically connected to the control module.
5. The bubble curtain drainage system according to any one of claims 1 to 4, further comprising a display module for displaying each collected data and an input module for inputting data, wherein the display module and the input module are both electrically connected to the control module.
6. The bubble curtain drainage system of claim 5, further comprising a computer device, the computer device comprising the control module, the display module, and the input module.
7. The bubble curtain drainage system according to any one of claims 1 to 4, wherein the bubble curtain generating pipe is arranged in a direction perpendicular to a water flow direction, the bubble curtain generating pipe is provided with a plurality of exhaust holes at intervals along an axis direction of the bubble curtain generating pipe, one end of the bubble curtain generating pipe is an air inlet end, the other end of the bubble curtain generating pipe is sealed, the air inlet end is used for receiving high-pressure gas, and the distance between every two adjacent exhaust holes is gradually reduced from the air inlet end to the other end of the bubble curtain generating pipe.
8. The bubble curtain drainage system as claimed in claim 7, wherein the total number of the exhaust holes is N, the number of the exhaust holes is 1 to N from the air inlet end to the other end, and the interval between the nth exhaust hole and the (N + 1) th exhaust hole is
Figure FDA0003172503640000021
Wherein N is more than or equal to 1 and less than N, N and N are natural numbers, and C is the distance between the 1 st exhaust hole and the 2 nd exhaust hole.
9. A method of controlling a bubble curtain drainage system as claimed in any one of claims 1 to 8, comprising the steps of:
setting the size of the vent holes of the bubble curtain generating tube and the distance between two adjacent vent holes;
acquiring the water flow velocity of a dredging construction water area and the gas velocity at an exhaust hole of a bubble curtain generating pipe, and judging whether the gas velocity is within a preset range;
if the gas speed deviates from the preset range, the control module outputs a signal to start the adjusting module, and the high-pressure gas flow conveyed to the bubble generating pipe is controlled until the gas speed is controlled within the preset range.
10. The control method of a bubble curtain drainage system as claimed in claim 9, wherein if the diameter of the exhaust hole is 0.2mm or 1mm and the water flow rate is 0.01m/s, the preset range is 1 ± 0.1m/s or 4 ± 0.1 m/s; if the diameter of the vent hole is 0.2mm or 1mm and the water flow speed is 0.05m/s, the preset range is 4 +/-0.1 m/s.
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CN112030910B (en) * 2020-09-02 2023-03-21 南京清中环境技术有限公司 Air curtain type pushing device convenient for collecting algae
CN112281970B (en) * 2020-12-01 2021-10-19 武汉理工大学 Equipment for improving loading efficiency of trailing suction hopper dredger

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