Abstract: A natural gas refining apparatus including a first separation membrane unit including a first separation membrane; and a second separation membrane unit provided in a subsequent stage of the first separation membrane unit. The second separation membrane unit includes a second separation membrane that allows an amine solution to circulate through the second separation membrane unit, and the natural gas refining apparatus refines raw natural gas containing CO2 by passing the raw natural gas through the first and second separation membrane units, separating CO2-rich gas with the first and second separation membranes, and absorbing CO2 with the amine solution circulating through the second separation membrane unit.

Abstract: A system and method for separating CO2 from natural gas, which ensure that no clogging or deterioration occurs in a gas separation membrane even after the gas separation membrane is used to remove carbon dioxide from the natural gas under conditions in which the natural gas is pressurized. First, an H2S remover removes hydrogen sulfide from raw natural gas. Then, a compressor pressurizes the natural gas from which H2S has been removed. After that, a cooler cools the pressurized natural gas so as to condense components that are a part of the natural gas. A gas/liquid separator removes the condensed components, and a CO2 separator, including a separation membrane for separating CO2 removes CO2 from the natural gas from which the condensed components have been removed. An expander, which shares a drive shaft with the compressor, expands the natural gas from which CO2 has been removed and recovers energy therefrom.

Abstract: This source gas purification apparatus includes: a first H2S removing device 2 which removes H2S from a source gas that includes at least a hydrocarbon, H2S, and a sulfur compound other than H2S; a sulfur compound conversion device 3 which converts the sulfur compound other than H2S into H2S; and a second H2S removing device 4 which removes the converted H2S.

Abstract: A system and method for separating CO2 from natural gas, which ensure that no clogging or deterioration occurs in a gas separation membrane even after the gas separation membrane is used to remove carbon dioxide from the natural gas under conditions in which the natural gas is pressurized. First, an H2S remover removes hydrogen sulfide from raw natural gas. Then, a compressor pressurizes the natural gas from which H2S has been removed. After that, a cooler cools the pressurized natural gas so as to condense components that are a part of the natural gas. A gas/liquid separator removes the condensed components, and a CO2 separator, including a separation membrane for separating CO2 removes CO2 from the natural gas from which the condensed components have been removed. An expander, which shares a drive shaft with the compressor, expands the natural gas from which CO2 has been removed and recovers energy therefrom.

Abstract: A natural gas refining apparatus including a first separation membrane unit including a first separation membrane; and a second separation membrane unit provided in a subsequent stage of the first separation membrane unit. The second separation membrane unit includes a second separation membrane that allows an amine solution to circulate through the second separation membrane unit, and the natural gas refining apparatus refines raw natural gas containing CO2 by passing the raw natural gas through the first and second separation membrane units, separating CO2-rich gas with the first and second separation membranes, and absorbing CO2 with the amine solution circulating through the second separation membrane unit.

Abstract: It is an object to provide a battery system whose life can be extended. A cell pack having at least one lithium secondary battery that uses a manganese-based cathode material and a control unit that controls charging and discharging of the cell pack are provided, and the control unit controls charging and discharging within a low-degradation voltage range that is set on the basis of a target cell degradation rate.

Abstract: It is an object to provide a battery system whose life can be extended. A cell pack having at least one lithium secondary battery that uses a manganese-based cathode material and a control unit that controls charging and discharging of the cell pack are provided, and the control unit controls charging and discharging within a low-degradation voltage range that is set on the basis of a target cell degradation rate.