Low-pressure lng gas supply system for dual-fuel marine engines and dual-fuel ships

Abstract

The invention provides a low-pressure LNG gas supply system for a dual-fuel marine engine, which includes an LNG storage tank, a first three-way regulating valve, a gas mixture separator, a gasifier, a mixing tank, a high-pressure injection pump, a high-pressure buffer tank, a first regulating Valve, low-pressure buffer tank, liquid collection tank, working medium pump, second three-way regulating valve, exhaust gas heat exchanger, gas-liquid separator, second regulating valve, low-pressure jet pump, third regulating valve, exhaust fan, heater and fourth regulating valve. The invention also provides a dual-fuel ship.

Description

technical field [0001] The invention relates to the technical field of ships, in particular to a dual-fuel ship engine low-pressure LNG gas supply system and a dual-fuel ship with the system. Background technique [0002] With the gradual deterioration of global atmospheric environmental problems, the International Maritime Organization has proposed many emission regulations for ships. In order to cope with the stringent regulations, liquefied natural gas (LNG, Liquefied Natural Gas), as a clean energy source, has gradually become an alternative fuel for ships. Correspondingly, Dual-fuel marine engines have also developed rapidly in recent years. [0003] At present, dual-fuel marine engines are divided into two categories, one is high-pressure dual-fuel engines with an air supply pressure higher than 300 bar, and the other is low-pressure dual-fuel engines. Among them, the low-pressure dual-fuel engine is roughly divided into two types according to the air supply pressure,...

AI Technical Summary

Problems solved by technology

The submersible pump belongs to low-temperature equipment, and the purchase cost is high. It is usually installed inside the storage tank or in the pump pool outside the storage tank. The submersible pump is in direct contact with the low-temperature LNG. The LNG in the tank or pump pool and the corresponding piping system is difficult to repair and the workload is large; the compressor is an intermittent operation equipment, which occupies a large area, high investment cost, more routine maintenance work, and fault repair. At the same time, when using the compressor to pressurize the LNG storage tank and warm the cabin, the operation time is longer due to the small displacement of the compressor

Both submersible pumps and compressors are energy-consuming equipment that consume a large amount of ship energy. Therefore, the conventional dual-fuel engine LNG low-pressure gas supply system has high investment costs, more maintenance work, difficult repairs, and low work efficiency in some working conditions. and high energy consumption

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