Method and device for expanding a gas with a reciprocating-piston machine
AssigneeBurckhardt Compression AG
InventorAlexandre Voser
Life of this patent
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Abstract
A method for expanding a compressed gas (GD) at a gas pressure (pD) with a reciprocating-piston machine, wherein the reciprocating-piston machine includes a piston that can move to and fro and a working chamber delimited by the movable piston. The method being carried out as follows: the compressed gas (GD) is supplied to the working chamber via an actuatable rotary slide valve, wherein the compressed gas (GD) in the working chamber is expanded in the working chamber.
Claims21
A method for expanding a compressed gas (GD) at a gas pressure (pD) with a reciprocating-piston machine, wherein the reciprocating-piston machine comprises a piston capable of moving to and fro and a working chamber delimited by the moveable piston, the compressed gas (GD) being delivered to the working chamber via an actuatable rotary slide valve, and the compressed (GD) present in the working chamber being expanded in the working chamber,
- wherein the rotary slide valve is closed, and a pressure differential prevailing over the closed rotary slide valve is reduced by compressing a gas residual quantity (GR) in the working chamber, and the rotary slide valve is opened when the pressure differential has been reduced, and
- wherein for controlling delivery the rotary slide valve is closed prematurely at a first valve closing angle (P′4), at which there is only a partial gas expansion quantity (GTE) present in the working chamber which is less than a maximum possible gas expansion quantity (GEMAX).
A device for expanding a compressed gas (GD), comprising a reciprocating-piston machine, wherein the reciprocating-piston machine comprises a piston capable of moving to and fro and a working chamber delimited by the moveable piston, and comprising an actuatable rotary slide valve and an actuatable second valve, and comprising an actuating device for actuating the rotary slide valve and the second valve, wherein the compressed gas (GD) is delivered to the working chamber via the rotary slide valve, and wherein the compressed gas (GD) present in the working chamber can be expanded in the working chamber, wherein the expanded gas present in the working chamber can be discharged via the second valve, wherein the actuating device already actively closes the second valve before a top dead center (P3) is reached, in order to compress a gas residual quantity (GR) present in the working chamber up to the top dead center (P3), and thereby to reduce the pressure differential (DD) prevailing on the rotary slide valve in the area of the top dead center (P3).
Dependencies are inferred from the claim text.