Fuel gasification and combined cooling heating and power supply system and method for LNG power driven vessel

Abstract

The invention discloses a fuel gasification and combined cooling heating and power supply system and method for an LNG power driven vessel. The fuel gasification and combined cooling heating and powersupply system comprises an LNG gasification and cooling capacity recovery unit, a main engine waste gas heat recovery unit, a low-temperature Rankine cycle unit, a power generating unit, a surplus cooling capacity recovery unit and a vessel steam, cooling capacity and power supply channel connected among the units. According to the fuel gasification and combined cooling heating and power supply system and method for the LNG power driven vessel, by means of the ingenious design, large-temperature difference heat exchanging of cold fluid and hot fluid is achieved in the LNG gasification processso that thorough gasification can be guaranteed; in the cold energy recovering process, small-temperature different heat exchanging is carried out through the cold fluid and the hot fluid so that thecold energy recovery efficiency can be improved; and the problems of freezing, low efficiency and the like of a traditional gasifier are solved through the unique circular self-evaporation design andcold energy recovering through circular secondary refrigerator. According to the fuel gasification and combined cooling heating and power supply system and method for the LNG power driven vessel, cold energy and waste heat recovery and power cycle generation of the vessel can be carried out at the same time, the cold energy and waste head recovery rate is relatively high, the safety coefficient is relatively large, and the energy conversion utilization efficiency of the LNG power driven vessel is effectively improved.

Description

technical field [0001] The invention relates to the field of high-efficiency energy utilization of LNG-powered ships, in particular to a system and method for gasification of LNG-powered ships' fuel and triple supply of cooling, heating and electricity. Background technique [0002] Liquefied natural gas (LNG) is a clean energy source. Compared with traditional diesel fuel, its combustion for energy can reduce a large number of particles and other air pollutants. Therefore, LNG is considered to be an attractive fuel alternative on ocean ships including yachts, barges, and container ships, and more and more ships will use LNG or hybrid (diesel / LNG) as fuel. LNG is a low-temperature fuel stored at -162°C under normal pressure conditions. It must be evaporated and superheated to ambient temperature before entering the ship's main engine. During this process, LNG releases about 860kJ / kg of cooling capacity, and uses this part of energy to provide refrigeration, air conditioning...

AI Technical Summary

Problems solved by technology

[0003] However, most of the current LNG liquefaction methods do not have a built-in cold energy recovery function, especially in LNG-powered ships, directly using seawater to gasify LNG may not be able to effectively meet the temperature requirements of natural gas fuel, and cannot guarantee the normal operation of the main engine engine of the ship. There may even be adverse consequences such as freezing pipelines, causing low-temperature damage to ships, and affecting the marine environment.

In addition, quite a lot of waste heat of the ship's main engine is directly discharged, which not only causes the loss of fuel gasification cold energy, but also wastes a lot of combustion waste heat

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