Future Technology AS has developed the FSCC - Future Subsea Controllable Cooler. It is a 2nd generation passive subsea cooler that is characterized by being simple, robust, reliable, and uses well-proven principles to operate.
FSCC exploit the naturally buoyant flow of seawater around the cooler tubes to maximize the cooling rate and minimize the overall size and weight. FSCC is designed to operate in an environment with quiescent seawater, yet sea currents will increase its cooling performance.
Depending on the application, the cooling requirement may change considerably during the lifetime for an oil/gas field. Changes in production rates and water content change the cooling requirements significantly.
• Reduced size and weight | reduced costs in fabrication, installation and maintenance • Controllability | cooling can be adjusted to yield an optimal outlet temperature • Passive | no energy consumption and minimized need for maintenance • Environmentally friendly | reduced need for chemical injection and no C02-emissions
• Pipeline inlet cooling to enable the use of less expensive pipeline materials • Inter-stage and inlet cooling for subsea gas compressors to increase efficiency • Re-cycle cooling for subsea gas compressors • Subsea separation for increased separation efficiency • «Cold flow» to control hydrates and wax in pipelines
The controllability is an important feature for its application within Oil & Gas, where changes in production rates and water content change the cooling requirements significantly. A controllable cooler reduces the risk for overcooling, thus preventing hydrate formation and wax precipitation. A controllable cooler contributes thereby to reduce the need for chemicals.
Future Technology AS has developed FSCC with support from ENGIE E&P NORGE, Lundin Norway AS, Innovation Norway and the Norwegian Research Council through the DEMO2000 program.
The FSCC offers an improved solution to the cooling requirements on HVDC converter platforms. It exploits the natural flow of seawater around the cooler tubes to maximize the cooling rate and minimize the overall size and weight. FSCC is designed to operate in an environment with stagnant seawater, yet the presence of sea currents will further increase its cooling performance.
HVDC (high voltage direct current) technology is often the preferred choice for transferring power from large offshore wind farms or wind farm clusters located far from shore. Offshore converter platforms are needed to convert the AC power generated by the wind turbines into HVDC. In the conversion process, part of the power is lost to heat, which introduces the need for an efficient cooling system.
The tradition for HVDC platforms is to use an open seawater system comprised of submerged seawater pumps and filters, as well as heat exchangers and ancillary systems/equipment located on the platform deck. The open seawater cooling systems are susceptible to clogging due to fouling, sand and mud, which results in frequent and extensive maintenance needs and subsequently high costs and poor reliability.
FSCC OFFERS REDUCED CAPEX AND OPEX
Using FSCC to meet the cooling requirements on HVDC platforms significantly reduces the complexity and increases the overall robustness of the cooling system. Furthermore, it minimises the need for maintenance and repairs and reduces the energy consumption on the platform.
THE ADDED BENEFITS ARE:
• Optimised | size and weight is minimized compared to existing technology • Passive | no energy consumption and negligible maintenance needs • Scalable | it can be tailored to accurately meet different cooling requirements using SIMCOOL – our internally developed design tool, proven through large-scale field-testing
The subsea cooler is passive, has no moving parts and operates in a closed loop where a mixture of glycol and water is circulated through the cooler. It eliminates the need for an open seawater system for cooling applications. This allows for a significant reduction in the capacity and complexity of the seawater pumps and accompanying power supplies, as well as negating the need for filters, topside heat exchangers, water treatment systems and associated equipment.
FSCC for Offshore Wind applications has been developed based on the Oil & Gas version with support from Innovation Norway through the Environmental technology scheme.
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