System and method for LNG regasification and fresh water preparation of LNG powered ship

Abstract

The invention discloses an LNG power ship LNG regasification and fresh water preparation system and method. The system includes an LNG regasification system and a fresh water preparation system. The LNG regasification system is sequentially composed of a liquid storage tank, a booster pump, a low-temperature heat exchanger, a condensation heat exchanger, and the fuel inlet m of the main engine connected through pipelines; the fresh water preparation system includes a refrigeration fresh water system, Flash evaporation legal fresh water system and evaporation legal fresh water system. The invention organically combines the process of LNG regasification and waste heat recovery after NG combustion with the process of preparing fresh water from seawater, and utilizes the cold energy released in the process of LNG regasification and the heat energy released by NG combustion after regasification to prepare fresh water, realizing the energy of LNG. The cascade and comprehensive utilization of the LNG-powered ship minimizes the environmental pollution caused by the cold energy and heat energy emitted by the LNG-powered ship, and greatly improves the energy comprehensive utilization efficiency of the LNG-powered ship.

Description

technical field [0001] The invention relates to an LNG power ship LNG regasification and fresh water preparation system and a working method thereof, belonging to the field of LNG power ship LNG gasification and LNG power ship fresh water preparation. Background technique [0002] There are two main ways to utilize LNG cold energy, one is direct utilization, and the other is indirect utilization. During the LNG gasification process, about 870kJ / kg of low-temperature energy can be generated, so the fuel on LNG-powered ships is sent to the main engine Contains huge cold energy before utilization. This system must first rationally utilize the huge cold energy of LNG regasification, and then consider how to improve the rational utilization of system waste heat, and improve the comprehensive utilization rate of the system under the premise of ensuring the stability of system energy. [0003] The patent application number is: 201621062958.4, and the name is: A cold energy compreh...

AI Technical Summary

Problems solved by technology

The seawater desalination system exchanges cold energy in the second stage of LNG cold energy utilization. The seawater desalination circulation system is only a circulation system of refrigerant, and does not elaborate on how to prepare fresh water; the cylinder jacket cooling water at 80 degrees Celsius in this system The heat has not been fully utilized; the high-temperature flue gas at the tail reaches two to three hundred degrees Celsius, and this part of the heat has not been fully utilized, which has caused a great waste of energy

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