A system and implementation method for cross utilization of cold and heat energy of lng power ship

Abstract

The invention aims at providing an LNG power ship cold energy and heat energy cross utilization system and an implementation method. A plate heat exchanger is arranged beside an engine fan. An LNG tank is sequentially connected with a first-level LNG vaporizer and a second-level LNG vaporizer. The plate heat exchanger is provided with a water outlet pipe and a water inlet pipe. The water outlet pipe and the water inlet pipe are connected with the first-level LNG vaporizer. An inlet of a liquid storage tank is connected with a heat dissipation pipe inside a heat dissipator. An outlet of the liquid storage tank is connected with an air-exhausting heat exchanger. The air-exhausting heat exchanger is connected with the second-level LNG vaporizer. The second-level LNG vaporizer is connected with the heat dissipation pipe inside the heat dissipator. A cooling pipe of an engine is connected with an expansion water tank through a water pump of the engine. A liquid collection disc is connected with an inlet T-branch pipe through a liquid collection pipe. A first branch and a second branch are connected with the inlet T-branch pipe. The expansion water tank is mounted on the first branch, and the heat dissipator is mounted on the second branch. By means of the LNG power ship cold energy and heat energy cross utilization system and the implementation method, cold energy of LNG and heat energy generated by combustion of the engine can be fully utilized, thus economical efficiency of operation of a ship is improved, and the working environment of marine engineers can be improved.

Description

technical field [0001] The invention relates to an engine heat utilization device and a using method. Background technique [0002] my country has rich water systems and numerous rivers and lakes. In the past 30 years, my country's sustained and rapid economic development has driven the prosperity of the shipbuilding industry, and the number of ships has increased rapidly. By the end of 2012, the number of inland and offshore ships in my country was about 179,200, the number of fishing boats was 695,600, and the number of fishing machinery was 3,487,800. At present, the power of ships is mainly diesel engines. Compared with vehicle engines, the technical development of marine diesel engines in my country is relatively slow, and the technical level is relatively low. With the increase in the number of ships, the pollution caused by ships to the atmosphere is becoming more and more serious. Especially in some sea areas, ports, and straits with dense waterways and high ship t...

AI Technical Summary

Problems solved by technology

When the engine is working in gas mode, it is necessary to heat the LNG to obtain gaseous natural gas. If the cold energy in the gasification process of LNG cannot be used, it can only be released to the environment, which will cause a waste of cold energy; while the engine is working Less than 50% of the heat released by fuel combustion is used for work, while other energy is released into the cabin and the atmosphere through exhaust and engine antifreeze, which not only causes heat loss, but also makes the environment of the closed engine cabin worse. detrimental to the health of engineers

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