A high-pressure natural gas liquefaction system and method

Abstract

The invention relates to a high-pressure natural gas liquefying system and method. The high-pressure natural gas liquefying system comprises a cold box, a refrigeration compressor, a BOG compressor, ahigh-pressure gas expander, a low-pressure gas expander, an LNG hydraulic turbine, an LNG flash tank and a raw material gas inlet pipeline. The cold box comprises a cold box high-temperature sectionand a cold box low-temperature section. The refrigeration compressor comprises a first refrigeration compressor section and a second refrigeration compressor section. The low-pressure gas expander isconnected with the first refrigeration compressor section, and the high-pressure gas expander is connected with the first refrigeration compressor section and the second refrigeration compressor section. The LNG hydraulic turbine is connected with the BOG compressor. According to the high-pressure natural gas liquefying system, the low-pressure gas expander and the high-pressure gas expander are connected with the refrigeration compressor, and the LNG hydraulic turbine and the BOG compressor are connected, so that the low-pressure gas expander and the high-pressure gas expander together drivethe refrigeration compressor, the LNG hydraulic turbine drives the BOG compressor, and the whole high-pressure natural gas liquefying system does not need to consume external energy resources when operates normally.

Description

technical field [0001] The invention relates to a high-pressure natural gas liquefaction system and method, belonging to the technical field of natural gas liquefaction. Background technique [0002] Traditional natural gas liquefaction technology usually includes 1-3 liquefaction refrigeration circuits, and each circuit includes compressor drive equipment, usually driven by electric motors or gas turbines or steam turbines, which consume a large amount of electric energy, fuel gas or steam, and the cost is relatively high. high. Contents of the invention [0003] In view of the above problems, the object of the present invention is to provide a high-pressure natural gas liquefaction system and method, which can realize the liquefaction of high-pressure natural gas by utilizing the pressure energy of natural gas and LNG, hardly need other driving energy, and has better economy. [0004] In order to achieve the above object, the present invention adopts the following techn...

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Problems solved by technology

[0002] Traditional natural gas liquefaction technology usually includes 1-3 liquefaction refrigeration circuits, and each circuit includes compressor drive equipment, usually driven by electric motors or gas turbines or steam turbines, which consume a large amount of electric energy, fuel gas or steam, and the cost is relatively high. high

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