In comparison with the combustion of diesel oil, Liquefied Natural Gas (LNG) is a type of cryogenic clean fuel, which is the crucial impetus of the country economy. It is an attractive solution to use it as engine fuel for cruises, barges, inner river ships as well as some heavy trucks. Before being burned, LNG will be vaporized and superheated to ambient temperature from -162°C, releasing 860 kJ/kg of cooling capacity contained in LNG. It is rational to extract and reuse the cryogenic cooling capacity to save the shaft power of the engine. The Cold Recovery and Utilization System can be employed on the platform of large- and medium-scale LNG fuelled vessels. Intermediate coolant is used to extract and transport the precious cryogenic cooling capacity from LNG to refrigerated spaces. The refrigerating temperature can be controlled and regulated in the range of -60°C to 10°C consecutively to satisfy a variety of cooling occasions such as refrigeration of frozen compartment, cold store, driving and living cabin. This technology has prominent multiple-benefits in terms of cost-saving, environmental-protecting and energy-saving, which will enhance the country’s competencies in the areas of energy efficient and environmental protection.
The cold recovery and utilization system can be employed on the platform of large- and medium-scale LNG fuelled vessels, and some LNG fuelled refrigerated trucks or large buses, etc. It also can be used to provide cooling for the air separation, sea desalination, refrigerator, and air conditioning, etc.
Market Trends and Opportunities
Liquefied natural gas will be the most important future fuel for sea and land transportation systems. LNG must be vaporized before use and cold recovery and utilization system will have enormous potential market to save ships fuel and reduce carbon dioxide emissions in maritime Industry.
The cooling capacity of LNG that may be used to provide cooling for the air conditioning system, perishable food items, etc., which will save about 20% of the ship energy than using extra chillers. Reducing fuel consumption by just 1 percent can mean an annual saving of $50,000 for a mid-sized bulk carrier and $300,000 a year for a large container ship. Multiply this by 20, and the potential savings in fuel and reduction in carbon dioxide emissions are astronomical.