Air pressure boost system used for natural gas incineration tower of LNG ship

Abstract

The invention discloses an air pressure boost system used for a natural gas incineration tower of an LNG ship. The air pressure boost system comprises the natural gas incineration tower, a first air inlet at the bottom of the natural gas incineration tower is connected with an air pipeline for introducing air, a second air inlet is connected with a natural gas pipeline for introducing boil-off gasgenerated in an LNG liquid cargo tank, a pressure boost turbine is mounted at the air inlet end of the air pipeline, an air supply fan is mounted at an air inlet of the pressure boost turbine, an exhaust pipe is arranged at the top of the natural gas incineration tower, a waste gas turbine coaxially connected with the pressure boost turbine is installed on the exhaust pipe, and a sensor is installed at the tail end of the exhaust pipe. According to the air pressure boost system used for the natural gas incineration tower of the LNG ship, waste heat in exhaust gas of the natural gas incineration tower can be converted into mechanical energy to be utilized, so that the utilization rate of waste heat energy of the natural gas incineration tower is increased, meanwhile, the exhaust gas temperature of the natural gas incineration tower is greatly reduced, the influence on the surrounding environment is reduced, and the environmental friendliness is improved.

Description

technical field [0001] The invention relates to the technical field of ship building, in particular to an air pressurization system for a natural gas combustion tower of an LNG ship. Background technique [0002] With its clean, convenient and high calorific value, natural gas has become a new energy source to replace coal and oil. The proportion of natural gas in the global energy consumption structure is increasing. The main forms of natural gas transportation are pipeline gas and liquefied natural gas (LNG). LNG is the main means to ensure the supply of natural gas in the future. The large LNG carrier, known as the "Pearl in the Crown", is a proprietary ship for transporting liquefied natural gas at minus 163°C, representing the highest technical level of commercial ships in the world. The natural gas incineration tower is a typical equipment on the LNG ship, which can realize the thermal oxidation treatment of various gases such as vaporized gas, cargo tank replacement...

AI Technical Summary

Problems solved by technology

The exhaust gas after the combustion of natural gas evaporated gas in the natural gas incineration tower is directly discharged into the outside atmosphere, usually at a temperature of nearly 500°C, resulting in a large amount of waste of heat energy. At the same time, the high-temperature exhaust gas also has a certain impact on the environment

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