| CPC F17C 7/04 (2013.01) [F17C 2205/0323 (2013.01); F17C 2205/0352 (2013.01); F17C 2221/033 (2013.01); F17C 2223/0161 (2013.01); F17C 2227/0157 (2013.01); F17C 2227/0309 (2013.01); F17C 2270/0105 (2013.01)] | 11 Claims |
|
1. An LNG gas supply system for a ship, comprising an LNG storage tank, a BOG pipeline for outputting evaporated gas of natural gas, a first LNG pipeline, a second LNG pipeline, and an ethylene glycol-water heating pipeline, wherein:
the LNG storage tank is connected with the BOG pipeline, the first LNG pipeline, and the second LNG pipeline, respectively, wherein:
the BOG pipeline includes a first regulating valve and a first-stage compressor unit arranged sequentially along a gas flow direction of the BOG pipeline, an outlet of the first-stage compressor unit being provided with a first branch pipeline and a second branch pipeline, the first branch pipeline being connected with a host via a second-stage compressor unit, and the second branch pipeline being connected with a first heater and a generator set sequentially via a fifth regulating valve;
the first LNG pipeline includes a second regulating valve, a first cold source of a multi-stream vaporizer, and a separator arranged sequentially along a gas flow direction of the first LNG pipeline, and the separator being connected with the generator set via the first heater;
the second LNG pipeline includes a third regulating valve, a first booster pump and a second cold source of the multi-stream vaporizer arranged sequentially along a gas flow direction of the second LNG pipeline, and the second cold source being connected with the host; wherein the first booster pump is used to pressurize LNG to a first pressure; and
the ethylene glycol-water heating pipeline includes a medium storage tank for storing ethylene glycol water, the ethylene glycol water being discharged from the medium storage tank and then returning to the medium storage tank after sequentially passing through a second booster pump, a heat source of the multi-stream vaporizer, a fourth regulating valve, and a second heater; the multi-stream vaporizer includes a pipe box and a core, the core being used to form flow channels, the flow channels including a first LNG flow channel constituting the first cold source, a heat exchange medium flow channel constituting the heat source, and a second LNG flow channel constituting the second cold source; the heat exchange medium flow channel is a sequential stacked structure including a first main flow channel, a first auxiliary flow channel, a second auxiliary flow channel, and a second main flow channel, the first main flow channel and the first auxiliary flow channel being connected to each other to form an upper heat source cavity, and the second main flow channel and the second auxiliary flow channel being connected to each other to form a lower heat source cavity; the second auxiliary flow channel and the first main flow channel being adjacent to each other, and the second main flow channel and the first auxiliary flow channel being adjacent to each other along a stacking direction of the heat exchange medium flow channel; wherein the second booster pump is used to pressurize liquid or gas to a second pressure, the second pressure is lower than the first pressure;
in the upper heat source cavity, a flow area of the first main flow channel is larger than a flow area of the first auxiliary flow channel, and the first main flow channel and the first auxiliary flow channel intersect with each other, so that an intersection forms a first connection point that penetrates each other; and
in the lower heat source cavity, a flow area of the second main flow channel is larger than a flow area of the second auxiliary flow channel, and the second main flow channel and the second auxiliary flow channel intersect with each other, so that an intersection forms a second connection point that penetrates each other.
|