Patent ID: 7909261

Claim:
A device, comprising: a primary fluid inlet configured to be connected to a source of pressurized hot gas; a secondary fluid inlet arranged around an end of the primary fluid inlet, the secondary fluid inlet being configured to be connected to a source of gas having a lower temperature than a temperature of said pressurized hot gas; a mixing chamber connected to the primary fluid inlet and to the secondary fluid inlet so as to allow inflow of gas into the mixing chamber directly from said fluid inlets; a fluid outlet connected to the mixing chamber for outflow of gas from the mixing chamber; an ejector nozzle comprising a constriction of the primary fluid inlet arranged at the end of the primary fluid inlet, the ejector nozzle being configured to introduce gas from the primary fluid inlet into the mixing chamber, the ejector nozzle being designed to allow gas from the secondary fluid inlet to be drawn into the mixing chamber by an ejector effect caused by pressurized hot gas entering the mixing chamber from the primary fluid inlet through the ejector nozzle; a valve arrangement comprising a valve member surrounding a portion of the primary fluid inlet and a portion of the ejector nozzle, the valve arrangement being arranged to influence the secondary fluid inlet so as to adjust an amount of gas entering the mixing chamber from the secondary fluid inlet; and a temperature-dependent regulator connected to the valve arrangement, the temperature-dependent regulator being configured to control a position of the valve member and thereby the amount of gas entering the mixing chamber from the secondary fluid inlet in dependence upon the temperature of the pressurized hot gas flowing through the primary fluid inlet or the temperature of the gas flowing through the fluid outlet.