A low-nitrogen combustion system for marine gas turbines based on low-temperature multiple-effect distillation

Abstract

The invention discloses a low-nitrogen combustion system for a marine gas turbine based on a low-temperature multi-effect distillation method, which includes a power output subsystem, a flue gas waste heat recovery subsystem, a seawater desalination subsystem and a steam generation subsystem, wherein the power output subsystem and the smoke Gas waste heat recovery subsystems are connected through gas turbines, flue gas waste heat recovery subsystems are connected with seawater desalination subsystems through condensate water evaporators, seawater desalination subsystems are connected with steam generation subsystems through the first fresh water pump , the flue gas waste heat recovery subsystem is connected with the steam generation subsystem through a steam superheater and a steam generator. The invention prepares fresh water by desalination of seawater by low-temperature multi-effect distillation, solves the problem of fresh water source for gas turbine reinjection steam, realizes the production of water vapor, reduces the emission of nitrogen oxides of gas turbine, and has huge economic benefits and ecology benefit.

Description

technical field [0001] The invention relates to a gas turbine low-nitrogen combustion system, in particular to a marine gas turbine low-nitrogen combustion system based on a low-temperature multi-effect distillation method. Background technique [0002] A gas turbine is a rotating impeller heat engine. It uses continuous flowing gas as its working medium and drives the impeller to rotate at high speed. It is an internal combustion power machine that converts the energy of fuel into useful work. When the gas turbine works, the compressor continuously inhales air from the atmosphere and compresses it. The compressed air enters the combustion chamber, mixes with the injected fuel and burns to become high-temperature gas, which then flows into the gas turbine to expand and do work, driving the turbine wheel to rotate. External output power. Compared with conventional power plants such as steam engines and diesel engines, gas turbines have the advantages of high power density an...

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Problems solved by technology

[0003] 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.

[0004] 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 lot 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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