Key Laboratory of Fishery Equipment and Engineering

Shanghai, China

Key Laboratory of Fishery Equipment and Engineering

Shanghai, China

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Wang Z.,Key Laboratory of Fishery Equipment and Engineering | Wang Z.,Chinese Academy of Fishery Sciences | Tang T.,Chinese Academy of Fishery Sciences | Xu Z.,Chinese Academy of Fishery Sciences | Ni H.,Chinese Academy of Fishery Sciences
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2017

Trawl winch is the most important equipment of trawler fishing. In order to ensure safe dragging operations of fishing vessel equipment under the complex sea conditions as well as to realize the quick response and precise control of trawl winch, and keep net shape good, in this study, the trawl tension automatic control system was designed based on electro-hydraulic control technology. The systemmainly consisted of proportional directional valve, balance valve, overflow valve, pilot valve, oil pressure sensor, and electric control system. Through measured input and output pressure of motor, we calculated warp tension as the feedback signal and usedPLC (programmable logic controller) to control the pressure of pilot relief valve, whichwas used to adjust the left and right warp tension and position, to maintain the dynamic balance of system as well as to keep the net shape good. The man-machine interface and operation mode of automatic tension control was developed based on LabVIEW, of which its main function consisted of parameter set, information management, system monitor and data inquire. The system facilitated operator monitoring the running state of the various equipment, and management equipment operation. In order to verify the characteristic and practicability of tension control of the system, application test was carried on the East China Sea area in 2015. The experiment continued about 4.5 hours, including three stages: shooting net, dragging net, and heaving net, which tested speed control and tension control performance of the system under the corresponding operating conditions, and measured relevant data such as shoot depth, shoot length, shoot speed, heave speed, warp tension and winch working pressure. The test resultshowed that dragging stage was the longest, and in this process, the left warp and right warp were kept balance, warp tension was mainly affected by hydrodynamic, warp weight, and water resistance of fishing gear. Warp shoot length range was 350-490 m, warp tension range was 118 -148 kN, corresponding to the system pressure of 2.3-2.7 MPa, and the average trawling speed of fishing vessel was 5.6 kN. Although warp tension various with the shoot length and shoot depth change, the winch was in constant tension state at the most. Data showed that the system could adjust the warp tension well to ensure trawl warp tension maintained in a certain range through adjusting the speed of receiving or releasing net, which suppressed effectively the interference of the warp tension variation on the nets. In addition, experiment also recorded the chart of net shape by netsonde, calculated the net expansion parameter. It could be known that net mouth perimeter was equal before and after using the tension automatic control system by comparison data. The net mouth height and net mouth roundness increased and the net mouth area was expanded by 9.5% after using tension control system, which effectively adjusted the net mouth expansion and improving the fishing efficiency. During the different stage of experiment, the set pressure of overflow valve should be different correspondingly. At the beginning of shooting, the pressure value was small, which can maintain good net mouth shape and position. Due to net speed increased relative to water flow, warp tension was increased and the maximum value reached 208 kN. The set pressure of overflow valve should be large so that it could be used to effectively protect warp and net safety, provided a guarantee for the safe production of fishing vessel. The experiment process was basically consistent with the actual fishing conditions. We concluded that in the tension automatic control mode, the trawl winch can automatically adjust speed of heave and shoot according to the fishing vessel speed and water flow. Though the system could generate heat and result in power loss during uses, the warp tension control system still cab meet the requirements of warp speed and tension control in the different trawl condition. © 2017, Editorial Department of the Transactions of the Chinese Society of Agricultural Engineering. All right reserved.


Gu J.,Key Laboratory of Fishery Equipment and Engineering | Gu J.,Chinese Academy of Fishery Sciences | Men T.,Chinese Academy of Fishery Sciences | Liu X.,Key Laboratory of Fishery Equipment and Engineering | And 4 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

An energy saving method for pond mechanical aeration was proposed based on oxygen mass transfer theory through experiments and analyses of different pond mechanical aeration patterns. With the method, an average 4% energy-saving was achieved for the existing pond mechanical aeration equipments by changing the operation control status and method. Furthermore, combined with use of water layer exchange machine for substitution of aerator at some time, it can save 29.2% of total energy consumption, compared with traditional operation mode of aerator. The results can provide a reference for application of pond mechanical aeration and development of intelligentized aeration research.


Gu J.,Key Laboratory of Fishery Equipment and Engineering | Gu J.,Chinese Academy of Fishery Sciences | Gu H.,Chinese Academy of Fishery Sciences | Men T.,Chinese Academy of Fishery Sciences | And 3 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

In order to compare the performance indexes of the main mechanical aeration methods in pond culture, the aeration capacity in clean water test, the changes of dissolved oxygen in actual pond and the power efficiency for some kinds of mechanical aeration methods were studied through historical and current data of clean water oxygenation test and field experiments in ponds. The results indicated that the aeration capacity of impeller aerator was 4% and 264% higher than those of paddlewheel aerator and propeller aerator respectively; the power efficiency of impeller aerator was 12.7% and 259% higher than those of paddlewheel aerator and propeller aerator respectively in clean water; the time to achieve the water layer mixing uniformity for impeller aerator was 40% less than those for paddlewheel aerator and propeller aerator, and the increasing values of dissolved oxygen for impeller aerator was 115% and 293% higher than those for paddlewheel aerator and propeller aerator respectively in pond. The comprehensive aeration performance of impeller aerator is higher than that of paddlewheel aerator and propeller aerator, and the propeller aerator has the worst comprehensive aeration performance. The study can provide useful references for the rational application of mechanical aeration methods in pond culture.


Hu Y.,Shanghai Ocean University | Ni Q.,Key Laboratory of Fishery Equipment and Engineering | Ni Q.,Chinese Academy of Fishery Sciences | Wu Y.,Shanghai Ocean University | And 2 more authors.
Procedia Engineering | Year: 2011

The dissolved CO 2 accumulation has become an important factor restricting production in the high-density recirculating aquaculture system in which pure oxygen injection is used. In this paper, a novel CO 2 removal device is designed for the recirculating aquaculture water environment based on the principle of gas exchange. In terms of experiments, the DOE (design of experiment) method is applied to design three factor two level orthogonal experiment, Further, significance effect of gas to liquid ratios (G / L), inlet CO 2 concentration, the water flow rate (Q W) on CO 2 removal efficiency is analyzed. Results show that G/L has the most significant influence on the CO 2 removal efficiency. Influences of the latter two on CO 2 removal efficiency are not apparent. Tests results of G/L effect on CO 2 removal efficiency show that, when G/L=1∼5, CO 2 removal efficiency increases rapidly with the increase of G/L; when G/L=5, CO 2 removal efficiency=80%∼88%; when G/L=8, CO 2 removal efficiency=86%∼92%, when G/L>8, CO 2 removal efficiency increases gently with the increase of G/L. Considering both system energy saving and effective removal of carbon dioxide, G/L=5∼8 is considered to be the best for the aquaculture water CO2 removal device running, CO 2 removal efficiency=80%∼92%. © 2011 Published by Elsevier Ltd.


Jiang T.,Key Laboratory of Fishery Equipment and Engineering | Xu M.,Key Laboratory of Fishery Equipment and Engineering | Zeng Z.,Shanghai Hongcheng Industrial Development Co. | Xu Z.,Chinese Academy of Fishery Sciences
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2014

At present, tail water generated by the cage culture contains a large quantity of residual feed, feces and other solid waste. If completely discharged, it will cause serious water eutrophication and severe damage for the ecological environment of culture waters. In view of the above question, the waste collection and waste treatment system of cage culture in open waters was developed for the cage culture reducing the tail water discharge and pollution into waters. This system is composed of the waste collecting device for collecting feed bait and fish feces, water supply and drainage system for water circulation into the closable cage, waste collection system for the scale of the cages and closable cages, filter for filtration to feed bait and fish feces and tail water processing system devices five parts. Compared with traditional net cage culture on water pollution, the waste collection and water treatment system of cage culture has four improvements: 1) Adding a dirt collecting bucket in each cage at the bottom, the solid waste together into the bucket, to facilitate the rapid promotion of waste collection. 2) In view of the traditional net cage waste collection, design sewage collection central gathering side lifting bucket apparatus; For a closable cage except with waste collection function, also has a deep water net cage will ascend to, bottom discharge function, with supreme and carry out the way water exchange, pneumatic recoil function, prevent the filter mesh is waste particles blocking. Water door with one-way flow function, prevent the back flow of sewage. 3) For solid waste water after filtration, using an ecological floating bed water pot of economic plants (such as Canna indica L., Acorus calamus L.) and microbial biofilm formation methods, nutrient rich water to fully absorb the water reach the discharge requirements. 4) The whole system adopts compressed air as the power source, centralized collection by using the method of pneumatic lifting implementation of waste water, centralized pneumatic depths can be a closed cage of ascension, as well as an aerated ecological floating bed. Waste collection in the running process of the system, collecting cage precipitation of tail water lifting and the air consumption, pressure has a very close relationship. The system of the waste collection tube with an inner diameter of PVC steel wire spiral reinforced hose 80 mm. 4.5 m under the water and gas water mixing chamber, namely air injection depth of 4.5 m. Through the test, in improving the sludge hopper in tail water, can be found through observation proposed by turbidity of tail water gradually becomes transparent, in this process, the 18 dirt collecting bucket of water statistics, the average sewage collection bucket lifting water is 0.34 m3. The results elaborated through professional transformation of large water cage facilities, constructed from the waste collection, solid-liquid separation, and the breeding of tail water after separation by ecological floating bed hanging membrane technology to physics and a set of ecological treatment system. The system collects the water discharged after treatment, the total phosphorus (TP), ammonia nitrogen (NH3-N), chemical oxygen demand (COD) were 0.305, 0.095, 16.2 mg/L, reached a `freshwater ponds water discharge requirements of ST9101-2007' II class standard. On the ammonia nitrogen and other indicators, the system realizes the standard exhaust culture of the tail water, greatly reducing the concentration of cage aquaculture wastewater to the water discharge. ©, 2014, Chinese Society of Agricultural Engineering. All right reserved.


Yuan K.,Chinese Academy of Fishery Sciences | Yuan K.,Shanghai Ocean University | Zhuang B.,Chinese Academy of Fishery Sciences | Zhuang B.,Key Laboratory of Fishery Equipment and Engineering | And 4 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2013

In order to meet the feeding needs of industrialization aquaculture system, an automatic feeding system was designed and developed applying the monorail technique, the slide rail power supply technique, the ultrasonic positioning technique, the wireless communication technique and the computer software technique. The system was composed of a running system, a power supply system, a feeding equipment and a control system. The feeding system with the function of auto detecting and error alarm could be automatic start and stop, weigh feeding amount and record system operation and feeding data automatically. The running system was mainly composed of a monorail likes a raceway made by H-shape steel, an electric pulley block and an ultrasonic positioning sensor. The four T forging steel rail wheels of the electric pulley block ran on the lower wing plate of H-shape steel. One reflecting plate (80 mm×150 mm) was installed on the monorail corresponded to each rearing tank. The number of each rearing tank was identified by the different distance between each reflecting plate and ultrasonic sensor moving with the electric pulley block. The feeding device comprised a hopper, stepper motor, a gate and four weighing sensors. Four sensors hung up the hopper to the electric pulley block and weighed the mount of the hopper. Opening and closing of the gate was controlled by the changes of the hopper weight. The design calculation showed that when using HW100×100 steel monorail, with the diameter of 0.06 m T forging steel rail wheels, gear ratio 20: 1 gear transmission group and 24 V DC motor to drive the system to moving on the monorail, the motor power must be more than 0.2 kW, speed was 2 000 r/min, output torque requirements must be over 0.58 N · m. The automatic feeding system prototype was designed by Solidworks, and the prototype was tested for the feeding amount accuracy and positioning deviation. The experiments showed that the feeding system was reliable and accurate for feeding with travelling speed 19 m/min, positioning accuracy was in the range of 58-118 mm, bullet storage capacity was 20 kg, feeding capacity was 3 kg/min and feeding accuracy was in the range of 0.5%-2.2%. The system effectively improves the feeding accuracy, reduces the feed waste, abates the labor intensity, and meets the needs of industrialization aquaculture system at the direction of the mechanization and automation. Future improvement will include a smoother monorail without seams and speeding the response of the electrical components to improve the accuracy of feeding and positioning. The results of this research provide a reference for the automatic feeding system design and the related follow-up research.


PubMed | Chinese Academy of Fishery Sciences and Key Laboratory of Fishery Equipment and Engineering
Type: Journal Article | Journal: PloS one | Year: 2016

Bream pond aquaculture plays a very important role in Chinas aquaculture industry and is the main source of aquatic products. To regulate and control pond water quality and sediment, a movable solar pond aquaculture water quality regulation machine (SMWM) was designed and used. This machine is solar-powered and moves on water, and its primary components are a solar power supply device, a sediment lifting device, a mechanism for walking on the waters surface and a control system. The solar power supply device provides power for the machine, and the water walking mechanism drives the machines motion on the water. The sediment lifting device orbits the main section of the machine and affects a large area of the pond. Tests of the machines mechanical properties revealed that the minimum illumination necessary for the SMWM to function is 13,000 Lx and that its stable speed on the water is 0.02-0.03 m/s. For an illumination of 13,000-52,500 Lx, the sediment lifting device runs at 0.13-0.35 m/s, and its water delivery capacity is 110-208 m(3)/h. The sediment lifting device is able to fold away, and the angle of the suction chamber can be adjusted, making the machine work well in ponds at different water depths from 0.5 m to 2 m. The optimal distance from the sediment lifting device to the bottom of the pond is 10-15 cm. In addition, adjusting the length of the connecting rod and the direction of the traction rope allows the SMWM to work in a pond water area greater than 80%. The analysis of water quality in Wuchang bream (Parabramis pekinensis) and silver carp (Hypophthalmichthys molitrix) culture ponds using the SMWM resulted in decreased NH3(+)-N and available phosphorus concentrations and increased TP concentrations. The TN content and the amount of available phosphorus in the sediment were reduced. In addition, the fish production showed that the SMWM enhanced the yields of Wuchang bream and silver carp by more than 30% and 24%, respectively. These results indicate that the SMWM may be suitable for Wuchang bream pond aquaculture in China and that it can be used in pond aquaculture for regulating and controlling water quality.


Zheng J.,Key Laboratory of Fishery Equipment and Engineering | Zheng J.,Jimei University | Hao J.,Jimei University | Wang B.,Jimei University | Shui C.,Jimei University
Key Engineering Materials | Year: 2011

Aquiculture wastewater, which is rich in nitrogen and phosphorus, is a main reason for the eutrophication of the surrounding water and is always a problem for the sustainable development of aquaculture. Although many treatments have been used in the field, the expensive cost limited their wide application. Microalgea is one of the most potential biomass materials for the renewable energy. However, over expensive cost, especially the raw material cost limited its industrialization. Microalgae can utilize the N and P in the wastewater to grow, so it is feasible to remediate the wastewater by microalgae and produce the biomass energy of microalgae from the wastewater. The present paper studied the growth of Isochrysis zhanjiangensis in three aquiculture wastewaters and optimized the cultivating condition. The research showed that Isochrysis zhanjiangensis could grow in the wastewater from the culture of Cynoglossus semilaevis. Under the condition of pH7, illumination 5000 LX and original inoculation density 0.01 mg/mL, the microalgae had the best growth. Under the optimal condition, the microalgae could eliminate 78% active phosphorus, 100% ammonia nitrogen, 62.3% nitrite nitrogen and 84.7% nitrate nitrogen in the wastewater within 11 days, which suggested that it was a good method for microalgae to cultivate in aquiculture wastewater because it could not only bioremediate the wastewater but also produce the biomass material. © (2011) Trans Tech Publications.


Zheng J.,Key Laboratory of Fishery Equipment and Engineering | Zheng J.,Jimei University | Wang B.,Jimei University
International Conference on Challenges in Environmental Science and Computer Engineering, CESCE 2010 | Year: 2010

Biomass energy of microalgea is one of the most potential renewable energy. However, over expensive cost, especially the material cost limited its industrialization. Aquiculture wastewater, which is rich in nitrogen and phosphorus, is a main reason for the eutrophication of the surrounding water and is always a problem for the sustainable development of aquaculture. Although many treatments have been used in the field, the expensive cost limited their wide application. Microalgae can utilize the N and P in the wastewater to grow, so it is feasible to purify the wastewater by the microalgae and produce the biomass energy of microalgae from the wastewater. The present paper studied the growth of Chlorella pyrenoidosa in three aquiculture wastewaters and optimized the cultivating condition. The study showed that Chlorella pyrenoidosa could grow in the wastewater from the culture of Cynoglossus semilaevis. Under the condition of pHS, illumination 5000 LX and original inoculation density 0.01 mg/mL, the microalgae had the best growth. Under the optimal condition, the microalgae could eliminate 75.2% active phosphorus, 100% ammonia nitrogen, 84.1% nitrite nitrogen and 52.8% nitrate nitrogen in the wastewater within 11 days, which suggested that the cultivation of microalgae in aquiculture wastewater is a good method for both the exploitation of microalgae biomass energy and the purification of wastewater. © 2010 IEEE.


Liu X.,Nanjing Agricultural University | Liu X.,Key Laboratory of Fishery Equipment and Engineering | Liu Z.,Nanjing Agricultural University | Xu H.,Key Laboratory of Fishery Equipment and Engineering | And 2 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2010

According to the characteristics of traditional freshwater ponds in aquaculture, a system of ecological engineering water recirculation ponds aquaculture was designed to solve the problems of aquatic pollution, waste of water and the safety of aquatic product. The system was composed of an eco-ditch, an eco-pond, constructed underflow wetlands and aquaculture ponds, with the area ratio of 1:5:3:30. In the system, the aquaculture ponds were arranged in series, and water flow facilities were built in the pond diagonal to exchange the upper and lower layer water. An impetus was used to circulate the water in the system. At the fish density of 0.20-0.82 kg/m3 and daily water exchange rate of 10%-15% in the system, the concentrations of ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, total nitrogen, total phosphorus and CODMn were lower than 1.89, 0.20, 1.50, 3.27, 0.59, and 9.0 mg/L, respectively, which were all lower than those of the control pond and satisfied the standards of national aquaculture water quality. The water purification results of ecological engineering facilities showed that, the removal rates of total nitrogen, total phosphorus and CODMn from the aquaculture emissions were above 52%, 39% and 17%, respectively, in the constructed underflow wetlands. The average removal rates of total nitrogen, total phosphorus and CODMn were above 18.35%, 17.39% and 18.18%, respectively, in the ecological ditch. And the average removal rates of total nitrogen, total phosphorus and CODMn were 24.72%, 26.32% and 5.86%, respectively, in the eco-pond. Compared to the traditional pond aquaculture, the ecological engineering water recirculation ponds aquaculture system can save as much as 63.6% water and reduce 81.9% COD emissions, which show significant effects on water saving and pollution emission reducing.

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