|Hybrid Rubber-Tired Gantry (RTG) Crane
Type: 35 – 42 LT Port Crane
Duty: Stacking intermodal containers
Owner: Shanghai International Port Group
Location: Multiple Installs – Yangshang, Yidong and Waigaoqiao Terminals
Energy Storage System ESS
Pack: 14 x 6.5 kWh
Capacity: 91 kWh
Bus Voltage: 700 VDC
Partners: Shanghai International Port Group, ZPMC, CCCC Shanghai Equipment Engineering, Corvus Energy
Notes: RTGs typically rely on a constant speed diesel generator for power generation. By hybridizing the RTG, we can yield a fuel consumption reduction of between 55 and 75%.
RTG Rubber Tired Gantry Cranes, AGV Automated Guided Vehicles
Efficient and Mobile
Hybrid Power Cleaning up Port Operations
Corvus Energy and integrators CCCC Shanghai Equipment Engineering have completed several retrofits of diesel Rubber Tired Gantry (RTG) cranes into diesel and LNG-battery hybrid RTGs. RTGs are used at container terminals and container storage yards to straddle multiple lanes of rail/road and container storage. RTGs typically rely on a constantspeed diesel generator for power generation.
By hybridizing an RTG, fuel consumption can be reduced by 65%. This technology not only reduces operating costs but also lowers exhaust and noise emissions in the terminal.
A Greener Solution
RTG cranes contribute a disproportionally high amount of air pollutants and emissions. Approximately 11% of oxides of nitrogen (NOx) emissions and 9% of diesel particulate matter (DPM) emissions from cargo handling equipment at ports is emitted by RTG cranes*. With a 65% reduction in harmful emissions and particulate the Corvus solutiondramatically improves local air quality.
(*2010 Air Emissions Inventories: Port of Long Beach and Port of Los Angeles. Starcrest LLC. 2011.)
Port of Shanghai, China
Corvus Energy is a world leader in hybridizing RTG cranes, currently powering 12 installations in the Port of Shanghai:
Benefits of the Hybrid RTG
Regenerative braking energy is captured and stored as electricity when a container is lowered. This recaptured energy is directed to the Corvus ESS, reducing the amount of power required from the generator.
No More Idling
In the conventional RTG configuration, the diesel generator undergoes periods of inefficient sustained idling, resulting in unnecessary fuel usage. With the Corvus ESS in place the diesel generator is shut down during traditional idling times, allowing the RTG to operate on “full electric” battery power.
A smaller generator, running fewer total hours, greatly reduces maintenance costs for the hybrid RTG.
The generator can now be sized for the average load with the battery handling the peak power output requirements. Reducing a 500 kW generator to a 50kW version significantly lowers fuel consumption and exhaust emissions.
Maximizing the Life of the Batteries
The Battery Management System (BMS) regulates electricity flow to and from the modules, performing cell balancing, state of health calculations and safety. The BMS also allows for
remote monitoring, firmware updates and facilitates a seamless integration.