Sea Technology

AUG 2017

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34 st / August 2017 converters (FLB) have been deployed. The width of the FLB is 7 m, and the rated sig- nificant wave height is 2 m. The test in the Daguan Island indicates that the efficiency of FLB is too low (14 percent) to be used in the coastal areas of China. SDU. SDU developed the 120-kW OB buoy prototype and deployed it near Hailv Is- land in November 2012. The gross weight of the SDU converter is about 110 tonnes. It has a 7-m diameter and operates between 0.5- and 6-m wave heights. The team is develop- ing three 110-kW converters. Every converter has three generators at 18, 37 and 55 kW. Tidal Tech Twenty-four institutions have been engaged in the R&D of tidal energy technology, resulting in 20 tidal turbines that have been deployed until the end of 2016, such as the 1-MW vertical-axis turbine developed by LHD Corp.; the 60-kW and 120-kW horizontal-axis turbines developed by Zhe Jiang University (ZJU); and the Haineng series turbines developed by Harbin Engineering University (HEU). LHD Corp. LHD Corp. has been developing modular vertical-axis turbines since 2009. In March 2016, the first platform, hosting 3.4-MW turbines and weighing 2,500 tonnes, was towed and fixed in the Xiushan Channel. In July 2016, two 300-kW and two 200-kW vertical-axis tur- bines were deployed for demonstration. A 1-MW project was gridded August 2016, and the turbines of the phase one project (2.4 MW) and phase two project (4.1 MW) will be deployed in the next two years. The cumulative power generation reached 170 MWh in January 2017. Meanwhile, LHD Corp. seeks to build a private operational tidal test site. ZJU. ZJU has been engaged in the development of tidal energy technology for more than 10 years. In 2005, ZJU designed and tested a 5-kW stationary horizontal-axis tur- bine with a fixed base. A 25-kW prototype was developed to solve the sealing and lubricating problem. From 2010 to 2016, under the support of the SFPMRE and National High- Tech R&D Program, ZJU developed and tested one 60-kW and one 120-kW floating semidirect-drive horizontal-axis turbine. The total conversion efficiency is 39 percent. The cumulative power generation reached 38 MWh in March 2017. HEU. HEU has been engaged in the development of tid- al current energy technology for more than 15 years. The Wanxiang I 2-by-35-kW floating vertical-axis turbine was deployed in 2002. The Wanxiang II 2-by-20-kW bottom- fixed vertical-axis turbine was deployed in 2005. Based on the Wanxiang turbines, HEU developed the Haineng I, Haineng II and Haineng III turbines under the support of SFPMRE. Haineng I is a vertical-axis turbine (2 by 150 kW), with 0.8 m/s cut-in speed and 2.5 m/s cut-out speed. It was deployed in July 2012 and halted for mechanical fault in November 2013. The efficiency of two turbines was about 30 percent. The Haineng II horizontal-axis turbine (2 by 100 kW), with 0.6 m/s cut-in speed and 2 m/s cut-out speed, was deployed in June 2013 and was out of commission after three months. The Haineng III vertical-axis turbine (2 by 300 kW), with 1.2 m/s cut-in speed and 3.5 m/s cut-out speed, was deployed in December 2013 and tested for 10 months. output power, but the stability was relatively poor. Based on the advantages and experiences of the duck-type WEC, GIEC developed the eagle-type WECs, with the features of a semi-submerged boat, a wave-absorbing floating body and a gate-shape support arm, wherein the floating body is fixed to the upper end of the arm, the lower end of the arm is connected with a hinge to the boat-shaped body via a base, and the support arm can rotate around the hinge, together with the floating body. The tank test showed that the floating body could effectively absorb incident waves and reduce transmission waves. The Eagle I WEC prototype (10 kW) was deployed near Wanshan Island from 2012 to 2014, with a total operating time of about 6,000 hours. The sea test has verified the effi- ciency of the device is 16.76 percent for small wave height, and the device has good maintainability. Since November 2015, the Wanshan eagle-type convert- er (100 kW) has been deployed near Wanshan Island and has generated more than 30 MWh to February 2017. The gross weight of the Wanshan converter is about 450 tonnes. There are four hawk-nose-type energy-capturing structures integrated in one semi-submerged boat for this converter. The total efficiency is more than 20 percent, with a 4- to 6.5-second wave period and 0.6- to 2.5-m wave height. The maximum output power is 128 kW. The stability of the de- vice during storms is good. There are high expectations that costs of the eagle-type wave energy technology will drop in the future and that the technology will reach the com- mercial phase. NOTC. NOTC has been engaged in the development of wave energy technology for more than 20 years. One 8-kW (in 1995) and two 30-kW (from 2001 to 2012) pendulum- type converters and two 50-kW (2012 to 2016) flap-type LHD 1-MW turbines gridded in demonstration.

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