A centrifugal gas-liquid separator comprising: - a tubular casing, coaxial about an axis and closed, on one side, by a base wall transverse to the axis and, on the other side, by a plug; - a central tubular duct, which is coaxially housed inside the tubular casing and is provided with a first free end (5-a) facing the plug and a second end (5-b) that communicates with a gas-outlet duct; - an annulus-shaped plate, carried by the central tubular duct and arranged in a direction transverse to the axis; the plate having a perimetral edge (11-p), which faces the inner wall of the tubular body to define an annular gap; the plate dividing the space inside the tubular casing into a first chamber delimited in an axial direction by the plug and by the plate and a second chamber axially delimited by the plate and by the base wall, the first chamber and the second chamber communicating with each other through the annular gap; - a liquid-outlet duct, which communicates with the second chamber; and - a liquid-phase/gas-phase inlet duct, which extends tangentially from the tubular casing and discharges into the first chamber in the proximity of the plug through an inlet nozzle, characterized in that it comprises first regulation means designed to modify the section of the inlet nozzle in order to modify the rate of entry of the liquid phase and gas phase into said first chamber and adapt operation of said centrifugal gas-liquid separator following variations of flow rate; said separator further comprises second regulation means designed to vary the radial dimensions of said annular gap in order to adapt said separator to variations of flow rate of the liquid phase and of the gas phase. - a tubular casing, coaxial about an axis and closed, on one side, by a base wall transverse to the axis and, on the other side, by a plug; - a central tubular duct, which is coaxially housed inside the tubular casing and is provided with a first free end (5-a) facing the plug and a second end (5-b) that communicates with a gas-outlet duct; - an annulus-shaped plate, carried by the central tubular duct and arranged in a direction transverse to the axis; the plate having a perimetral edge (11-p), which faces the inner wall of the tubular body to define an annular gap; the plate dividing the space inside the tubular casing into a first chamber delimited in an axial direction by the plug and by the plate and a second chamber axially delimited by the plate and by the base wall, the first chamber and the second chamber communicating with each other through the annular gap; - a liquid-outlet duct, which communicates with the second chamber; and - a liquid-phase/gas-phase inlet duct, which extends tangentially from the tubular casing and discharges into the first chamber in the proximity of the plug through an inlet nozzle, characterized in that it comprises first regulation means designed to modify the section of the inlet nozzle in order to modify the rate of entry of the liquid phase and gas phase into said first chamber and adapt operation of said centrifugal gas-liquid separator following variations of flow rate; said separator further comprises second regulation means designed to vary the radial dimensions of said annular gap in order to adapt said separator to variations of flow rate of the liquid phase and of the gas phase. characterized in that it comprises first regulation means designed to modify the section of the inlet nozzle in order to modify the rate of entry of the liquid phase and gas phase into said first chamber and adapt operation of said centrifugal gas-liquid separator following variations of flow rate; said separator further comprises second regulation means designed to vary the radial dimensions of said annular gap in order to adapt said separator to variations of flow rate of the liquid phase and of the gas phase.