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Turboexpander (100, 200, 300) for expanding high-pressure ratio gas, comprising: a plurality of hollow impellers (EXP (1); EXP (2);....EXP(J)) configured in multiple stages; and a tie rod to pass through each of the plurality of hollow impellers (EXP (1); EXP (2);.... EXP(J)), wherein the plurality of hollow impellers (EXP (1); EXP (2);.... EXP(J)) are stacked together and tightened through the tie rod disposed in a rotor (120, 220, 320); wherein the turboexpander (100, 200, 300) comprises a first radial bearing (130, 230, 330), and a second radial bearing (140, 240, 340).

The internal combustion engine (9), comprises a cylinder-piston system (13) with an intake port (13.4), into which an intake valve (13.8) is inserted, and an exhaust port (13.5) into which an exhaust valve (13.9) is inserted. The engine further comprises an intake pipe (37) fluidly coupled with the intake port (13.4), and a throttle valve (39) positioned along the intake pipe (37). A first resonator (43) is connected to the intake pipe (37). The first resonator (43) comprises a resonant cavity (46) having a resonant volume thereof placed in direct fluid coupling only with a resonant duct (47) and, by means of the resonant duct (47), with the intake pipe in a position between the throttle valve (39) and the intake valve (13.8).

Die Erfindung betrifft einen Heizkatalysator (2) für eine Abgasnachbehandlungseinrichtung oder einen Reformer, welcher dazu eingerichtet ist, Kraftstoff mit einem Oxidationsmittel umzusetzen, wobei der Heizkatalysator (2) ein Gehäuse (25) aufweist, welches einen Einlass (21) und einen Auslass (22) aufweist, wobei der Einlass (21) dazu eingerichtet ist, das Oxidationsmittel zuzuführen und der Auslass (22) dazu eingerichtet ist, ein Produktgas abzuführen, und wobei der Heizkatalysator (2) weiterhin einen im Gehäuse (25) angeordneten Katalysatorträger (5) enthält, wobei an einer Seite des Katalysatorträgers (5) eine Kraftstoffplatte (6) angeordnet ist, welche dazu eingerichtet ist, dem Katalysatorträger (5) den Kraftstoff zuzuführen und an einer der Kraftstoffplatte (6) gegenüberliegenden Seite des Katalysatorträgers (5) eine Lochplatte (4) angeordnet ist, welche dazu eingerichtet ist, dem Katalysatorträger (5) das Oxidationsmittel zuzuführen, wobei die Lochplatte (4) eine Mehrzahl von Durchgangsbohrungen (41) aufweist, welche in zumindest einer ersten Zone (421) der Lochplatte (4) eine geringere Anzahl und/oder eine geringere Flächendichte und/oder einen geringeren Durchmesser aufweisen und welche in zumindest einer zweite Zone (422) eine größere Anzahl und/oder eine größere Flächendichte und/oder einen größeren Durchmesser aufweisen.

The ring assembly comprises a first ring component and a second ring component, arranged coaxial to one another and extending around an axis of the ring assembly. The two ring components are constrained to one another along an interface formed by mutually matching surfaces of revolution of the first ring component and second ring component. The two ring components are coupled by interference fitting. Disclosed herein is also a turbomachine including one or more ring components and a method of assembling.

An integrated solar combined cycle comprising a compression train, preferably a turbo-compression train of a gas storage plant and a waste heat recovery system is disclosed. In particular, the compression train comprises one or more compression stages, wherein heat exchangers are configured to recover heat from the gas between the compression stages by exchanging heat with a thermal fluid circulating in a thermal circuit in a plurality of heat exchangers including higher temperature heat exchangers and lower temperature heat exchangers. Additionally, the waste heat recovery system comprises a thermodynamic cycle system operating a working fluid and including a thermodynamic cycle circuit comprising first heaters configured to exchange heat between the thermal fluid of the thermal circuit, downstream of the higher temperature heat exchangers, on one side and said working fluid on the other side, to heat and evaporate said working fluid, one or more expanders, arranged downstream of said first heaters and configured to expand said working fluid to give a mechanical work, coolers arranged downstream of the expanders and pumps downstream of the coolers and upstream of the first heaters. In particular, the coolers are configured to exchange heat between the working fluid on one side and the thermal fluid of said thermal circuit downstream of the lower temperature heat exchangers, on the other side, to cool and condensate said working fluid. Finally, the waste heat recovery system comprises a solar thermal system, including a solar field, to heat alternatively the thermal fluid or a solar thermal fluid.

An estimation method for determining the oxygen storage capacity of a first catalytic converter (6), which is arranged upstream of a second catalytic converter (7) along an exhaust duct (4) of an internal combustion engine (1). The estimation method provides for the steps of: carrying out an initial combustion phase, in which the combustion takes place with a lean air-fuel mixture at least until a first oxygen probe (S3) arranged downstream of the second catalytic converter (7) signals a switch to a lean air-fuel mixture; carrying out an intermediate combustion phase immediately following the initial combustion phase and in which the combustion takes place with a rich air-fuel mixture at least until a second oxygen probe (S2) arranged downstream of the first catalytic converter (6) signals a rich air-fuel mixture; and carrying out a final combustion phase immediately following the intermediate combustion phase and in which the combustion takes place with a lean air-fuel mixture after the second oxygen probe (S2) signals a rich air-fuel mixture and at least until the second oxygen probe (S2) signals a lean air-fuel mixture.