Combined cycle natural gas processing system

A combined cycle natural gas processing system comprising:

• a natural gas processing plant that produces liquefied natural gas from natural gas;
• and
• a carbon dioxide cycle power plant that includes a power generation turbine using a carbon dioxide fluid as a driving fluid, and performs power generation using a carbon dioxide cycle that pressurizes and heats the carbon dioxide fluid discharged from the power generation turbine and supplies the carbon dioxide fluid again to the power generation turbine,
• wherein the natural gas processing plant includes:
• an acid gas removal unit (AGRU) that separates carbon dioxide contained in the natural gas;
• a pressurizing unit that pressurizes a carbon dioxide separation stream separated by the acid gas removal unit;
• and
• a carbon dioxide supply line that causes the carbon dioxide separation stream pressurized in the pressurizing unit to join the carbon dioxide fluid flowing in the carbon dioxide cycle,
• the carbon dioxide cycle power plant includes:
• a combustor that is provided on an inlet side of the power generation turbine, mixes the pressurized and heated carbon dioxide fluid with a light hydrocarbon gas containing methane as a main component and a high-purity oxygen gas and combusts the carbon dioxide fluid mixed with the light hydrocarbon gas and the high-purity oxygen gas to generate the carbon dioxide fluid containing high-temperature and high-pressure steam, the light hydrocarbon gas being by-produced when the liquefied natural gas is produced in the natural gas processing plant;
• a separator that cools the carbon dioxide fluid containing the steam, discharged from the power generation turbine and decompressed, to condense and separate the steam;
• and
• an extraction facility that extracts a carbon dioxide fluid exceeding a required circulation amount, determined according to electric power that needs to be obtained by the power generation, out of the carbon dioxide fluid from which moisture has been separated by the separator, and
• electric power obtained by driving a generator using the power generation turbine is supplied to a power consumption device provided in the natural gas processing plant, the carbon dioxide fluid extracted from the extraction facility is supplied to a carbon dioxide reception facility capable of receiving carbon dioxide, and the carbon dioxide generated with production of the liquefied natural gas is not released to atmosphere.

A combined cycle natural gas processing system comprising:

• a natural gas processing plant that produces liquefied natural gas from natural gas;
• and
• a carbon dioxide cycle plant that includes an energy conversion turbine configured to convert energy held by a driving fluid into mechanical energy using a carbon dioxide fluid as the driving fluid, and obtains the mechanical energy using a carbon dioxide cycle that pressurizes and heats the carbon dioxide fluid discharged from the energy conversion turbine and supplies the carbon dioxide fluid again to the energy conversion turbine,
• wherein the natural gas processing plant includes an acid gas removal unit (AGRU) that separates carbon dioxide contained in the natural gas,
• the carbon dioxide cycle plant includes:
• a combustor that is provided on an inlet side of the energy conversion turbine, mixes the pressurized and heated carbon dioxide fluid with a light hydrocarbon gas containing methane as a main component and a high-purity oxygen gas and combusts the carbon dioxide fluid mixed with the light hydrocarbon gas and the high-purity oxygen gas to generate the carbon dioxide fluid containing high-temperature and high-pressure steam, the light hydrocarbon gas being by-produced when the liquefied natural gas is produced in the natural gas processing plant;
• a separator that cools the carbon dioxide fluid containing the steam, discharged from the energy conversion turbine and decompressed, to condense and separate the steam;
• and
• an extraction facility that extracts a carbon dioxide fluid exceeding a required circulation amount, determined according to the mechanical energy that needs to be obtained by the energy conversion, out of the carbon dioxide fluid from which moisture has been separated by the separator, and
• the mechanical energy obtained by driving the energy conversion turbine is supplied to a mechanical energy consumption device provided in the natural gas processing plant, the carbon dioxide fluid extracted from the extraction facility and a carbon dioxide separation stream separated by the acid gas removal unit are supplied to a carbon dioxide reception facility capable of receiving carbon dioxide, and the carbon dioxide generated with production of the liquefied natural gas is not released to atmosphere.

A combined cycle natural gas processing system comprising:

• a natural gas processing plant that produces liquefied natural gas from natural gas;
• and
• a carbon dioxide cycle plant that includes an energy conversion turbine configured to convert energy held by a driving fluid into mechanical energy using a carbon dioxide fluid as the driving fluid, and recovers energy using a carbon dioxide cycle that pressurizes and heats the carbon dioxide fluid discharged from the energy conversion turbine and supplies the carbon dioxide fluid again to the energy conversion turbine,
• wherein the natural gas processing plant includes:
• an acid gas removal unit (AGRU) that separates carbon dioxide contained in the natural gas;
• a pressurizing unit that pressurizes a carbon dioxide separation stream separated by the acid gas removal unit;
• and
• a carbon dioxide supply line that causes the carbon dioxide separation stream pressurized in the pressurizing unit to join the carbon dioxide fluid flowing in the carbon dioxide cycle,
• the carbon dioxide cycle plant includes:
• a combustor that is provided on an inlet side of the energy conversion turbine, mixes the pressurized and heated carbon dioxide fluid with a light hydrocarbon gas containing methane as a main component and a high-purity oxygen gas and combusts the carbon dioxide fluid mixed with the light hydrocarbon gas and the high-purity oxygen gas to generate the carbon dioxide fluid containing high-temperature and high-pressure steam, the light hydrocarbon gas being by-produced when the liquefied natural gas is produced in the natural gas processing plant;
• a separator that cools the carbon dioxide fluid containing the steam, discharged from the energy conversion turbine and decompressed, to condense and separate the steam;
• and
• an extraction facility that extracts a carbon dioxide fluid exceeding a required circulation amount, determined according to the mechanical energy that needs to be obtained by the energy conversion, out of the carbon dioxide fluid from which moisture has been separated by the separator, and
• the mechanical energy obtained by driving the energy conversion turbine is supplied to a mechanical energy consumption device provided in the natural gas processing plant, the carbon dioxide fluid extracted from the extraction facility is supplied to a carbon dioxide reception facility capable of receiving carbon dioxide, and the carbon dioxide generated with production of the liquefied natural gas is not released to atmosphere.