Zero-carbon-emission LNG fuel power ship cold energy waste heat comprehensive gradient utilization system

Abstract

The invention relates to a zero-carbon-emission LNG fuel power ship cold energy waste heat comprehensive gradient utilization system, and belongs to the technical field of energy utilization. The system comprises an LNG cold energy gradient utilization subsystem, a tail gas waste heat gradient utilization subsystem and a CO2 liquefaction capture subsystem; LNG and a secondary refrigerant are subjected to heat exchange, so that LNG cold energy gradient utilization is realized; a ship main engine is connected with a steam turbine through a heat exchanger to achieve tail gas waste heat gradient utilization; and CO2 generated by a ship main engine in the CO2 liquefaction capture subsystem is connected with a seawater desalination evaporator through the heat exchanger, and the seawater desalination evaporator is connected with a liquid CO2 storage tank through a steam-water separator to achieve CO2 liquefaction capture. The system can meet the requirements of ship electricity utilization, refrigeration house refrigeration, air conditioner refrigeration, seawater desalination and the like. Waste of LNG cold energy and tail gas waste heat is reduced, the ship energy utilization rate is increased, meanwhile, carbon emission is reduced, and energy conservation and emission reduction of the ship energy utilization system are achieved.

Description

technical field [0001] The invention relates to a zero-carbon emission comprehensive cascade utilization system of cold energy waste heat of an LNG fuel-powered ship, which belongs to the technical field of energy utilization. Background technique [0002] As China puts forward the goal of carbon neutrality in 2060, releases the "14th Five-Year Plan" comprehensive work plan for energy conservation and emission reduction, and the International Maritime Organization (IMO) announces the implementation of new emission regulations for 2020, the shipbuilding industry is constantly exploring new energy conservation and emission reduction measures . LNG, liquefied natural gas, is recognized as the cleanest fossil energy on earth and is expected to become one of the environmentally friendly fuels for ships in the future. During use, LNG fuel needs to be vaporized and passed to the main engine for combustion. Under 1 standard atmospheric pressure, the temperature rises from -162°C to...

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Problems solved by technology

In addition, after natural gas is burned in the engine, it will produce high-temperature exhaust gas above 300°C. If it is directly discharged, it will cause a large amount of waste of low-temperature waste heat resources and thermal pollution.

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