Floating liquefied-gas production facility

Patent metadata

Field	Value
Publication number	US-10126048-B2
Application number	US-201414893638-A
Country	US
Kind code	B2
Filing date	Apr 7, 2014
Priority date	Apr 7, 2014
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

This floating liquefied-gas production facility (1) is equipped with: a gas turbine unit (20); a liquefaction facility (90) that has a primary refrigeration compressor (40) driven by the gas turbine unit (20), and cools natural gas; a drum-circulation-type exhaust heat recovery boiler (30) that recovers the energy of exhaust heat from the gas turbine unit (20) as steam; a component separation system (85) that uses the steam generated by the drum-circulation-type exhaust heat recovery boiler (30) as a heat source to separate components in natural gas obtained from the ocean floor, and sends said components to the liquefaction facility (90); and a fuel gas supply device (100) that compresses end-flash gas and/or boil-off gas, and supplies said compressed gas to the gas turbine unit (20) as fuel.

First claim

The invention claimed is:

1. A floating liquefied-gas production facility comprising: a deck including base members of a plurality of layers in a vertical direction, the plurality of layers including an uppermost layer, an intermediate layer and a lowermost layer: a gas turbine unit having an intake duct that sucks air into an enclosure of the gas turbine unit; a liquefaction device which has a primary refrigeration compressor driven by the gas turbine unit and is configured to cool natural gas;
a drum circulation type exhaust heat recovery device configured to recover energy of exhaust heat of the gas turbine unit as steam;
a component separation system configured to separate components in the natural gas extracted from an ocean floor using the steam generated by the drum circulation type exhaust heat recovery device as a heat source and configured to send the separated components to the liquefaction device by using exhaust heat; and
a fuel gas supply device configured to compress at least one of an end-flash gas and a boil-off gas and supply the at least one of the end flash gas and the boil-off gas to the gas turbine unit as a fuel,
wherein the intake duct is installed on the base member of the uppermost layer, wherein the gas turbine unit and the primary refrigeration compressor are installed on the base member of the intermediate layer,
wherein the drum circulation type exhaust heat recovery device is installed on the base member of the lowermost layer,
wherein the drum circulation type exhaust heat recovery device has a height that reaches an upper part of the base member of the intermediate layer, and
wherein the drum circulation type exhaust heat recovery device is disposed at least partially at the same position of the gas turbine unit in the height direction, and the gas turbine unit and the drum circulation type exhaust heat recovery device are disposed in parallel to each other wherein the component separation system comprises a fractionator configured to fractionate the natural gas: and
an auxiliary compressor as a natural gas booster compressor configured to send the natural gas to the liquefaction device, and
wherein the fractionator and the natural gas booster compressor are configured to use the steam generated by the exhaust heat recovery device as the heat source.

2. The floating liquefied-gas production facility of claim 1 , wherein
the drum circulation type exhaust heat recovery device is horizontally installed.

3. The floating liquefied-gas production facility of claim 1 , wherein
the component separation system comprises:
an acid gas removal device configured to remove an acid gas contained in the natural gas extracted from the ocean floor; and
an antifreeze recycling device configured to recover and recycle antifreeze added when the natural gas is extracted;
wherein the acid gas removal device and the antifreeze recycling device are configured to use the steam generated by the exhaust heat recovery device as the heat source.

4. The floating liquefied-gas production facility of claim 3 , further comprising:
a steam turbine configured to be driven by the steam generated by the exhaust heat recovery device; and
at least one of the auxiliary compressor and a main generator driven by the steam turbine, wherein the component separation system is configured to use the steam used in the steam turbine as the heat source.

5. The floating liquefied-gas production facility of claim 4 , wherein
the auxiliary compressor comprises:
a feed gas compressor configured to compress the natural gas supplied to the acid gas removal device,
a stabilizer overhead compressor configured to compress a condensate gas,
the natural gas booster compressor configured to supply the natural gas to the liquefaction device, and
an end-flash gas compressor configured to compress an end-flash gas and the boil-off gas in the fuel gas supply device.

6. The floating liquefied-gas production facility of claim 1 , wherein the drum circulation type exhaust heat recovery device comprises:
a boiler body;
an exhaust connection duct for introducing exhaust gas discharged from the gas turbine unit into the boiler body; and
an exhaust pipe that exhausts the exhaust gas discharged from the boiler body to an outside, wherein the exhaust connection duct comprises a direction changing section configured to change a flow direction of the exhaust gas so that a flow direction of the exhaust gas from the gas turbine unit is opposite to a flow direction of the exhaust gas into the exhaust heat recovery device.

7. The floating liquefied-gas production facility of claim 6 further comprising:
guide vanes that are provided in the exhaust connection duct,
wherein the guide vanes divide an interior of the exhaust connection duct into a plurality of parts in a flow passage width direction and into a plurality of parts in a flow passage height direction.

8. The floating liquefied-gas production facility of claim 6 , wherein the boiler body has a plurality of boiler units,
wherein the plurality of boiler units are laminated in a plurality of stages in a height direction in the state in which the directions of the plurality of boiler units are aligned, and the plurality of boiler units are disposed in a plurality of rows in a width direction perpendicular to the flow direction of the exhaust gas.

9. The floating liquefied-gas production facility of claim 6 , wherein the boiler body further includes a plurality of boiler units and a steam-water separation drum, wherein the steam-water separation drum has the same number of the boiler units.

Assignees

• Mitsubishi Heavy Ind Compressor Corp

Inventors

• Nagao Hideki
• Kobayashi Masahiro

Classifications

• F25J1/0259

  Modularity and arrangement of parts of the liquefaction unit and in particular of the cold box, e.g. pre-fabrication, assembling and erection, dimensions, horizontal layout "plot" · CPC title

• Y02P80/154

  Cross-Sectional Technologies · mapped topic

• F25J2230/60

  the fluid being hydrocarbons or a mixture of hydrocarbons · CPC title

• F02C3/22

  the fuel or oxidant being gaseous at standard temperature and pressure (F02C3/28 takes precedence) · CPC title

• F25J2240/82

  with waste heat recovery, e.g. in a combined cycle, i.e. for generating steam used in a Rankine cycle · CPC title