A low-nitrogen combustion system for gas turbines on lng-powered ships

Abstract

The invention discloses a gas turbine low-nitrogen combustion system for an LNG-powered ship, which includes an LNG gas supply subsystem, a seawater desalination subsystem, a power output subsystem, a flue gas waste heat recovery subsystem, and a steam generation subsystem, wherein the LNG gas supply subsystem It is connected with the seawater desalination subsystem through the LNG-intermediate medium heat exchanger, the LNG gas supply subsystem is connected with the power output subsystem and the flue gas waste heat recovery subsystem through a multi-stream heat exchanger, and the power output subsystem is connected with the The flue gas waste heat recovery subsystems are connected through a gas turbine, the seawater desalination subsystem is connected with the steam generation subsystem through the third fresh water pump, the flue gas waste heat recovery subsystem and the steam generation subsystem are connected through a steam superheater and connected to the steam generator. The invention utilizes LNG cold energy to realize desalination of seawater, satisfies the demand for fresh water for gas turbine reinjection steam, reduces nitrogen oxide discharge, and has huge economic and ecological benefits.

Description

technical field [0001] The invention relates to a gas turbine low-nitrogen combustion system, in particular to a gas turbine low-nitrogen combustion system for an LNG-powered ship. Background technique [0002] Since the beginning of the 21st century, international fuel prices have continued to rise, greatly increasing the cost of ship operations. At the same time, with the increase of various pollutants, environmental pollution has become a problem that needs to be faced by the whole world. Diesel-fueled ships produce large volumes of atmospheric-polluting emissions that seriously affect air quality in inland ports and on the coast. Therefore, finding cheap and environmentally friendly fuels has become an urgent need for the shipping industry. Natural gas reserves are abundant and the price is cheap. Using natural gas as fuel is the general trend of the future development of the shipbuilding industry. For the convenience of transportation, natural gas is usually stored in...

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Problems solved by technology

[0004] Since the air contains a large amount of nitrogen, the flue gas emitted by the gas turbine contains a large amount of nitrogen oxides. In addition, due to the high combustion temperature of the gas turbine, the flue gas after doing work still has a high temperature. The gas turbine exhaust temperature Usually it can reach above 500°C. If the flue gas is discharged directly without treatment, it will not only pollute the atmosphere but also waste a lot of heat energy.

[0005] The reinjection steam gas turbine cycle can greatly improve the working characteristics of the gas turbine. The application of this technology in industrial power generation gas turbines has been mature, but this technology has not been applied to marine gas turbines, because reinjection steam needs to consume a large amount of fresh water. The key The technical bottleneck is that the water source for steam injection has not been properly resolved

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