System and method for LNG (liquefied natural gas) regasification and fresh water preparation of LNG power ship

Abstract

The invention discloses a system and method for LNG (liquefied natural gas) regasification and fresh water preparation of an LNG power ship, wherein the system comprises an LNG regasification system and a fresh water preparation system. The LNG regasification system is formed by enabling a liquid storage pot, a booster pump, a low-temperature heat exchanger, a condensing heat exchanger and a fuelinlet m of a main engine to be successively communicated through a pipeline; the fresh water preparation system comprises a system for preparing fresh water through a refrigeration method, a system for preparing the fresh water through a flash distillation method and a system for preparing the fresh water through an evaporation method. After the LNG regasification and NG (natural gas) burning, thewaste heat recovery process and the process for preparing fresh water by using seawater are organically combined, the fresh water is prepared through utilizing cold energy released in the LNG regasification process and thermal energy released by NG burning after the regasification, stepped and comprehensive utilization of LNG energy is realized, the cold energy and thermal energy discharged by the LNG power ship to pollute the environment can be reduced to the maximum extent, and the comprehensive utilization efficiency of the energy of the LNG power ship is substantially improved.

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

Images