The Government actively promotes the use of renewable energy, among which the Drainage Services Department is studying the installation of solar power generation systems in various water conservancy facilities in Hong Kong in order to achieve the goal of "making the best use of the land".
In recent months, the Drainage Services Department has selected the area of the Shing Mun River near Lek Yuen Bridge in Shatin as a pilot floating solar system to test the electric field environment that the river can withstand and whether the system can be fixed in the corresponding range in bad weather. Due to the difficulty of installing the simulation system, Therefore, the cost is as high as 2.3 million yuan.
The first phase of the test took half a year. The Drainage Services Department said that the system was designed with the wind that can defend against the super typhoon Mangkhut in 2018. The tropical cyclone Mulan hit Hong Kong earlier this month, and the system was not affected much.
The Drainage Services Department stated that the second phase will be implemented after the first phase of the trial period, with additional system planning.
In recent months, the Drainage Services Department has selected a site near the Lek Yuen Bridge on the Shing Mun River in Shatin to conduct a pilot floating solar system to test the electric field environment that the river can withstand and whether the system can be fixed in the corresponding range in bad weather.
The Drainage Services Department pointed out that it was difficult to install the simulation system, so the cost was 2.3 million yuan.
(Photo by Lu Yiming)
6 solar panels simulate floating solar power generation The bottom of the river is anchored with 90 tons of heavy stones
The first phase of the pilot project of the floating solar energy system on the Shing Mun River in Shatin was officially launched in early August, with a construction time of one month and a cost of 2.3 million.
The system covers an area of 55 square meters on the sea surface, and a total of 6 solar panels are installed to simulate the future floating solar power generation system.
A total of 10 stone anchors weighing 9 tons each were placed on the bottom of the river to secure the floating platform.
The system is in the shape of a long strip and is located in the middle of the river, leaving two waterways for boats to travel.
The first phase of the pilot project of the floating solar energy system on the Shing Mun River in Shatin was officially launched in early August, with a construction time of one month and a cost of 2.3 million.
The system covers an area of 55 square meters on the sea surface, and a total of 6 solar panels are installed to simulate the future floating solar power generation system.
(Photo by Lu Yiming)
The first phase of the material test for half a year of low reflectivity solar panels did not scare away birds
Cai Weijie, the electrical and mechanical engineer of the Drainage Services Department in charge of the project, pointed out that the first phase of the floating solar system in Shing Mun River will be tested for half a year to test the safety and stability of the system under severe weather. The power generation system provides a reference.
Before the completion of the system, the DSD had consulted various stakeholders such as green groups, residents and boat channel users.
Cai Weijie said that the system uses low-reflectivity solar panels, which basically does not have any reflection problems, nor does it scare away birds, and more birds are willing to stay on the solar panels.
The structures at sea meet the requirements of the Marine Department, and there are buoys to remind users of the channel, and there is no impact on the water quality.
Choi Wai-kit, an electrical and mechanical engineer from the Drainage Services Department, who is in charge of the project, said that the system was designed to withstand the 285 km/h wind speed of Typhoon Mangkhut in 2018. It was also hit by Typhoon Mulan in early August, and the system was not affected in any way.
(Photo by Lu Yiming)
Design benchmark against 2018 mangosteen wind
Cai Weijie pointed out that since the first phase is mainly based on research, the solar energy system is not connected to the grid, but it is speculated that it can provide the annual electricity consumption of a three-person family.
In addition, the system was designed to withstand the 285 km/h wind speed of Typhoon Mangkhut in 2018. It was also hit by Typhoon Mulan in early August, and the system was not affected in any way.
He continued that the reason for choosing the Shing Mun River is that there are many passers-by and tourists nearby, and the DSD believes that the educational significance of the Lek Yuen Bridge area will help deepen the public's understanding and support for renewable energy projects.
In addition, there are many government facilities near Lek Yuen Bridge, and the renewable energy generated by solar panels can be used for these facilities in the future.
The installation of the simulation system barge has to pass through six bridges before construction, so the construction cost is high
The first-stage system cost 2.3 million yuan, which is relatively expensive for an analog system.
Cai Weijie explained that this was because large construction vehicles could not drive into the river for construction, so all construction equipment and materials had to be transported to the nearby Shatin Sewage Treatment Plant, and then hoisted onto the pontoon, and then the tugboat was used to connect the pontoon. It will be applied to the construction location of Shing Mun River by waterway.
The tugboats and barges entering the Shing Mun River from the waterway have to pass through six bridges, each of which has different height restrictions and is affected by the ebb and flow of tides.
Due to the height limitation of the bridge, the hoisting machinery on the barge needs to be specially designed to pass.
However, the hoisting machinery of this design is not sufficient to lift the 9-ton anchor blocks each.
In the end, it is necessary to make concrete cages each weighing about 3 tons. After placing the concrete cages at the construction site, the concrete bricks are put in to make 9-ton stone anchors to stabilize the floating solar system.
It is planned that the second phase of the first exhibition will be enough to meet the annual electricity consumption of 9 three-person households
Cai Weijie mentioned that the second phase will be entered after the half-year test phase is completed. It is expected that the area of the on-site system will be increased to 400 square meters along the upstream side at the beginning of next year, involving 60 solar panels, and the total annual power generation is expected to be about 30,000 kilowatt-hours of electricity, which is the annual electricity consumption of 9 three-person households, and all of them are used in nearby government facilities.
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