A new comprehensive cold energy utilization system for liquefied natural gas-powered container ships

Abstract

The invention discloses a system for comprehensive utilization of cold energy of LNG-powered container ships. The method uses two-stage cascaded Rankine cycle power generation based on integral IFV to convert high-grade cold energy of LNG supplied as fuel for main and auxiliary engines into electric energy and converts high-temperature cold energy into electric energy. The cold storage system is added to the internal process of the IFV supplying the fuel for the auxiliary engine as the preheater of the first-stage Rankine cycle, and the seawater desalination system is added to the internal process of the first IFV supplying the fuel for the main engine as the first-level Rankine. Circulating preheater, the LNG from the first IFV is pressurized by the high-pressure pump into the second IFV, and the single-stage Rankine cycle is used to generate electricity, and the low-temperature cold storage system is added to the internal process of the IFV as preheating After the BOG is pressurized and combined with the low-pressure NG pipeline, it is sent to the air-conditioning module together with the high-pressure NG; finally, the NG with different pressures is heated to 45 ℃ by the main machine cylinder jacket water and sent to the main machine and the auxiliary machine. efficient use of cold energy.

Description

technical field [0001] The invention relates to the technical field of ships, in particular to a comprehensive utilization method of LNG cold energy based on an integral IFV for ship power generation, cold storage, desalination, air conditioning, etc. based on a novel integral intermediate gasifier. Background technique [0002] In the next 15 years, China will still be in a period of rapid growth in natural gas demand. It is estimated that by 2030, China's natural gas demand will exceed 5000×108m3. The huge demand for natural gas is currently mainly stored and transported with low-temperature liquefied natural gas (LNG) through natural gas cryogenics. However, when LNG reaches the user terminal for use, it needs to be gasified to room temperature, and a large amount of cold gas will be released during this process. If this part of cold energy is not effectively used, it will not only cause a huge waste of energy, but also have an adverse impact on the environment. [0003]...

AI Technical Summary

Problems solved by technology

At this time, an intermediate medium circulation pump needs to be installed in the middle of the system, and the seawater no longer heats the NG first and then heats the intermediate medium, but enters the NG thermostat and the intermediate medium vaporizer independently, so that the entire formed LNG vaporizes the cold energy The utilization system is complex and large

However, the ship's engine room is limited by the limited space. If the separate equipment is used, the system structure is not only complicated, but also occupies a relatively large area, making it difficult to implement the system due to the space constraints of the ship's engine room.

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