LNG fuel cold energy comprehensive utilization method and system used for dual-fuel power boat

Abstract

The invention discloses an LNG fuel cold energy comprehensive utilization method used for a dual-fuel power boat. According to the method, LNG fuel cold energy of a deep cooling part is converted intoelectric power through Rankine cycle power generation, and a coolant of a low-temperature refrigerator circulation unit is utilized to recover LNG fuel cold energy of a moderate cooling part; when cold supply to the low-temperature refrigerator circulation unit is achieved, cold supply to all refrigerating demand units which are sequentially nested with one another in series connection in the low-temperature refrigerator circulation unit is carried out, and then a coolant of an air condition refrigerating unit is utilized to recover LNG fuel cold energy of a mild cooling part; at last, main cylinder jacket water is utilized to heat an LNG fuel to raise the temperature of the cold liquid LNG fuel until a power boat main machine air feeding requirement is met. Meanwhile, the invention alsodiscloses a system capable of implementing the method. The method is particularly suitable for the dual-fuel power boat, traditional fuel feeding can be combined, and cooling units are increased and decreased according to actual demands of the boat and the LNG cold amount, so that the method is flexible and applicable. The system is highly integrated and is small in scale, short in LNG circulationline and higher in safety.

Description

technical field [0001] The invention relates to the field of utilization of cold energy of LNG, in particular to a method and a system for comprehensive utilization of cold energy of LNG-powered ship fuel. Background technique [0002] In the 21st century, human beings are facing huge environmental pollution problems and the crisis of exhaustion of traditional energy sources. Energy saving and emission reduction has become the theme of the development of the current era, and it is also the goal and direction of the development of the shipbuilding industry. Since liquefied natural gas (LNG) is used as a ship fuel, compared with traditional fuels, its SO X Emissions will be reduced by 100%, NO X Emissions will be reduced by 92%, CO 2 Emissions would be reduced by 23%. Moreover, the global reserves of liquefied natural gas are very rich. Based on the above advantages, LNG will surely become the first choice of global ship fuel in the future. [0003] Dual-fuel powered ocean...

AI Technical Summary

Problems solved by technology

This invention solves the practical problem of different temperature requirements in different compartments of LNG-powered ships, but still has the same problem as Publication No. 103557568A, that is, it does not realize the cascaded and efficient utilization of LNG cold energy

[0008] In addition to publication numbers 103557568A and 105465925A, there are many patents that are designed for a single function on the ship, and have not realized the efficient utilization of the LNG cold energy on the LNG-powered ship.

[0009] From the above-mentioned existing reports, it can be seen that the single utilization of LNG cold energy technology mainly has the disadvantages of large effective energy loss and low efficiency of cold energy utilization.

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