CN-122004166-A - Micro-bubble shellfish purifying temporary culture system and method based on cross rotational flow shearing coupling

CN122004166ACN 122004166 ACN122004166 ACN 122004166ACN-122004166-A

Abstract

The invention discloses a micro-bubble shellfish purifying temporary culture system and method based on cross rotational flow shearing coupling, and belongs to the technical field of aquaculture purification. The system comprises a circulating water pump, a temporary culture box body and a gas-liquid coupling jet device arranged at the inlet of the box body. The jet device is internally provided with a turbulent flow core with cross swirl grooves, so that circulating water and sucked gas form high-speed rotary turbulence and collide and shear when flowing through, microbubbles are generated in situ and then tangentially injected into the box body, and the water body is driven to form swirl. The box body is internally provided with a bearing screen plate with arc-shaped diversion holes and an inverted cone-shaped sewage collecting hopper bottom, and the center of the bottom is provided with a double-channel sewage discharging component to realize the directional discharge of sewage and the circulation of clear liquid. According to the invention, independent aeration equipment is not needed, and the efficient cleaning and oxygenation are realized through the synergistic effect of the microbubbles and the rotational flow, so that the shellfish stress is avoided, and the cross contamination is effectively prevented.

Inventors

CHEN XIAOYU
PAN LANLAN
YU JINGBO
YANG CHUNGUANG
WANG ZHENNING
XIE ZHAOJU
ZHENG RUIQIAN

Assignees

大连海洋大学

Dates

Publication Date: 20260512
Application Date: 20260331

Claims (10)

1. The micro-bubble shellfish purifying temporary rearing system based on cross rotational flow shearing coupling is characterized by comprising a circulating water pump (110), a temporary rearing box body (300) and a gas-liquid coupling jet device (200) arranged at an inlet of the temporary rearing box body (300), wherein a turbulence core (220) is arranged in the gas-liquid coupling jet device (200), at least one group of cross rotational flow grooves are formed in the surface of the turbulence core (220), each cross rotational flow groove consists of at least two groups of left spiral grooves (221) and right spiral grooves (222) with opposite rotational directions, a plurality of cross collision points are formed on the surface of the turbulence core (220) by the two groups of spiral grooves, circulating water and sucked gas form high-speed rotating turbulence when flowing through the cross rotational flow grooves, and the circulating water and sucked gas collide and shear in a mixing cavity of the jet device (200), and the generated micro-bubbles are ejected into the temporary rearing box body (300) in a tangential direction.
2. The micro-bubble shellfish purifying temporary rearing system based on cross rotational flow shearing coupling, which is disclosed by claim 1, is characterized in that a bearing screen plate (320) is arranged in the box body (300), a sewage collecting funnel bottom (330) is arranged below the bearing screen plate (320), the bearing screen plate (320) is arranged in the temporary rearing box body (300), and a double-channel sewage discharging assembly (400) is arranged in the center of the box bottom.
3. The micro-bubble shellfish purifying temporary rearing system based on cross rotational flow shearing coupling according to claim 1, wherein the jet ejector (200) comprises a liquid inlet (260), a premixing chamber (210), a rotational flow generation area, a main mixing chamber (230) and an accelerating spray hole (250) which are sequentially communicated, wherein the liquid inlet (260) is used for being connected with circulating water and is connected with an inlet end of the premixing chamber (210), an air suction inlet (240) is arranged on a cavity of the premixing chamber (210), the rotational flow generation area is arranged at the lower part of the premixing chamber (210), a turbulence core (220) is arranged in the rotational flow generation area, the cross rotational flow groove is formed in the surface of the turbulence core (220), the main mixing chamber (230) is arranged at the lower part of the rotational flow generation area and is communicated with the main mixing chamber, and the accelerating spray hole (250) is arranged at an outlet of the main mixing chamber (230).
4. A micro-bubble shellfish purifying and temporarily raising system based on cross rotational flow shear coupling according to claim 3, characterized in that the specific design parameters of the turbulence core (220) meet the condition that the helix angle α of the left spiral groove (221) and the right spiral groove (222) is set to 5 ° -60 °, so that two fluids with opposite rotational directions collide at an intersection point with an included angle of 90 ° -120 °.
5. The micro-bubble shellfish purifying and temporarily culturing system based on cross rotational flow shear coupling according to claim 4, wherein the ratio of the groove depth h to the groove width w of the spiral groove is 1:1.2-1:1.5, the area shrinkage ratio K of the total flow section S groove of the cross rotational flow groove to the throat section S nozzle of the accelerating spraying hole (250) is S nozzle /S groove , and the K value is 0.6-0.75.
6. The micro-bubble shellfish purifying temporary rearing system based on cross rotational flow shear coupling according to claim 2, wherein the double-channel blowdown overflow assembly (400) comprises an inner tube (410) and an outer tube (420) which are concentrically arranged, wherein the inner tube (410) is a blowdown channel, a water inlet at the upper end of the inner tube is directly connected with and penetrates through an opening at the lowest point of the bottom (330) of the blowdown collecting hopper, the lower end of the inner tube is used as a blowdown outlet (410) for discharging converged pollutants, the outer tube (420) is an overflow channel and is sleeved outside the inner tube (410) to form an annular flow channel therebetween, at least one overflow opening (420) is formed in the upper part of a tube body of the outer tube (420), and the lower end of the outer tube (420) is connected with a water return tube (440) for guiding overflowed clear liquid back to the circulation system.
7. The temporary micro-bubble shellfish purifying and culturing system based on cross rotational flow shearing coupling as claimed in claim 2, wherein the carrying net plate (320) is provided with a plurality of arc-shaped diversion holes, the arrangement direction of the diversion holes is consistent with the rotational flow direction in the box body (300), and the box body (300) is provided with a tangential water inlet (310).
8. The micro-bubble shellfish purifying and temporarily culturing system based on cross rotational flow shear coupling according to claim 1, wherein an independent electric micro-bubble generating device is not arranged in the system, and micro-bubbles are completely generated by a gas-liquid coupling ejector (200) in situ by utilizing the kinetic energy of water flow.
9. A method for purifying and temporarily culturing microbubble shellfish based on cross rotational flow shear coupling, which is applied to the system for purifying and temporarily culturing microbubble shellfish based on cross rotational flow shear coupling as set forth in any one of claims 1 to 8, and is characterized by comprising the following steps: step S1, starting and initializing a system, and setting a resting mode frequency threshold fquiet and a self-cleaning mode frequency threshold fclean; step S2, in a resting mode, running a circulating water pump (110) by fquiet to generate micro-bubbles with the average particle size of 50-80 mu m, maintaining high dissolved oxygen in the tank and avoiding shellfish stress; S3, when the system triggers a cleaning instruction, switching to a self-cleaning mode, and operating a circulating water pump (110) at 45-60Hz to generate microbubbles with average particle size of 10-30 mu m, and stripping mucus on the surfaces of shellfish; And S4, in the running process, the system monitors the dissolved oxygen value and the turbidity value of the water body in real time, and carries out self-adaptive fine adjustment on the frequency f of the water pump so as to ensure that the particle size of the micro bubbles is stabilized in a target zone.
10. The micro-bubble shellfish purifying temporary culture method based on cross rotational flow shearing coupling is characterized in that the setting of the water pump frequency is based on a preset corresponding relation between the water pump frequency and the particle size of micro-bubbles, the corresponding relation is obtained through system calibration, and the method is characterized in that in a static culture mode, the average particle size of the micro-bubbles is maintained at 50-80 mu m to prolong the residence time of the bubbles in a water body and improve the dissolved oxygen mass transfer efficiency, and in a self-cleaning mode, the average particle size of the micro-bubbles is compressed to 10-30 mu m to strengthen the local shearing force when the bubbles break, so that physical stripping of shellfish surface mucus is realized.

Description

Micro-bubble shellfish purifying temporary culture system and method based on cross rotational flow shearing coupling Technical Field The invention relates to temporary shellfish culture equipment, in particular to a temporary microbubble shellfish purifying culture system and method based on cross rotational flow shear coupling. Background Shellfish such as oyster, scallop, clam, etc. usually need temporary rearing and purification before being marketed to remove sediment, pathogenic bacteria and metabolic waste. The traditional temporary culture mode mostly adopts a simple running water pool or net cage stack. However, shellfish can secrete large amounts of mucus during the decontamination process, which can easily adhere to the bottom of the temporary tank or to the shell surface, which encapsulates the feces. If the water circulation is not smooth, the shellfish can re-inhale the pollutants, so that secondary pollution is caused, and the food safety index is seriously influenced. In addition, the traditional cleaning mode relies on manual flushing, and is high in labor intensity and easy to cause shellfish stress to close the shell, so that the purification efficiency is reduced. Temporary shellfish culture mainly faces three problems of difficult mucus removal, low dissolved oxygen and cross contamination. The specific problems are as follows: the specific problems are as follows: 1. The existing microbubble oxygenation technology generally needs an independent air compressor and a microbubble generator, is high in equipment cost, and is complex in pipeline and difficult to maintain. The bubble diameter that traditional bottom aeration produced is big, and the rising speed is fast, can't stay in the aquatic for a long time, also can't go deep into shellfish fold and carry out effective washing. 2. The flow state is single, and current box is mostly flat bottom structure, and the bottom viscidity filth can't be taken away to the rivers overflow. If strong water flow scouring is directly carried out in the culture water body, the shellfish closed shell stress is easily induced, and the filter food purification is stopped. 3. The traditional venturi jet device mostly adopts a T-shaped or right-angle Y-shaped structure, and the fluid has larger kinetic energy loss at the junction, so that the rotational flow driving force is insufficient, and the gas-liquid mixing uniformity is poor. 4. The prior patent CN117678544A discloses a layered temporary culture rack for ecologically purifying shellfish, which pumps water to the top layer by using a water pump, flows down layer by layer, and combines microalgae and filter cotton for purification. The patent relies on gravity laminar flow and filter cotton interception, and the laminar flow can not peel off viscous metabolites, and filter materials are easy to block and cause secondary pollution. 5. The prior patent US20150373954A1 discloses a recirculating aquaculture system which utilizes stripping and biofilters for water treatment, but the bubble generating means are independent and located at the bottom. The ascending flow impacts the ventral surface of the shellfish to induce shell closure stress, and large bubbles are difficult to penetrate deep into folds for cleaning. Disclosure of Invention In order to solve the problems, the invention discloses a micro-bubble shellfish purifying temporary rearing system and a method based on cross rotational flow shearing coupling, which adopt a cross rotational flow shearing type gas-liquid coupling jet device to generate micro-bubbles in situ and realize self-cleaning and cross pollution prevention shellfish circulating water purifying temporary rearing system through flexible rotational flow. A micro-bubble shellfish purifying temporary culture system based on cross rotational flow shearing coupling comprises a circulating water pump, a temporary culture box body and a gas-liquid coupling jet device arranged at an inlet of the temporary culture box body, wherein a turbulence core is arranged in the gas-liquid coupling jet device, at least one group of cross rotational flow grooves are formed in the surface of the turbulence core, each cross rotational flow groove consists of at least two groups of left spiral grooves and right spiral grooves which are opposite in rotational direction, a plurality of cross collision points are formed on the surface of the turbulence core by the two groups of spiral grooves, circulating water and sucked gas form high-speed rotational turbulence when flowing through the cross rotational flow grooves, and collide and shear in a mixing cavity of the jet device to generate micro-bubbles and then tangentially jet into the temporary culture box body, a bearing screen plate is arranged in the box body, a sewage collecting funnel bottom is arranged below the bearing screen plate, a two-channel pollution discharge assembly is arranged in the temporary culture box body, and the center of the box b