Exonerative Dehnungsausgleicher for the exit gas line of a gas turbine

PATENT OFFICE class: 46 f 16 lnt. CI.: F 02 C PATENT SPECIFICATION No. 272004 SHARES ESELLSCHAFT BROWN, BOVERI & CIE. IN BATHING (SWITZERLAND) exonerative Dehnungsausgleicher for the exit gas line of a gas turbine announced at the 18.August 1966 (A 7864/66); Priority of the registration in Switzerland of the 29.November 1965 (Nr.16384/65) stresses. Beginning of the patent duration: 15.September 1968. The Eri'mdung concerns a relieved Dehnungsausgleicher for the exit gas line of a gas turbine, with one on an end of pipe closely, but axially adjustably arranged coat, into which HoMkörper forming with the coat a circular flow channel for the flowing through medium is built, of two each other sealing spreading, against each other axially adjustable parts consists, by which the elne with the coat and the other one are rigidly connected with the end of pipe. It is well-known a Dehnungsausgleicher of the kind mentioned with a sword pipe provided closed at the end on its extent with holes, which is adjustably in a housing stored by means of a pair of stuffing boxes closely, but. The coat area of the housing branches out to: ton of single channels, which are again united over the end of the sword pipe hinausund to a common collecting body, whereby the secondary arms are trained after the venturi principle. This and other well-known relieved Dehnungsausgleicher for pipings it exhibits the disadvantage that the medium must flow through by slots or holes. Thus the current is obstructed, what entails considerable pressure losses. There in the well-known Delmungsausgleichern the admission of the medium at pressure balance surfaces or - piston likewise via narrow slots or holes effected, suffers the pressure balance with sudden pressure changes, like it for example with Verpuffungen in Luftund gas lines to arise can, an unwanted delay, so that shocklike on the fixed points of the piping working forces must be taken in purchase. Furthermore an attachment of the ultimate waste disposal is well-known for the wave of a Flngzeugbrennkraftturbine, with which in relation to the working medium gas density bearing house is trained warm-mobile in the Turbineagehäuse fastened and as diffuser. A Dehnungsausgleicher between turbine cases and exit gas line is missing and for the case planned here also not necessary, since all Banteile in the direction can expand axially freely. In the case of use of the well-known mechanism for a stationary power station with being fixed fixed points on the exhaust side an additional device would have to be planned for the reconciliation of the longitudinal expansions. In addition the camp is accessible neither gekühh in the installation condition with this attachment. The invention is the basis the task to avoid with a relieved Dehnungsausgleicher for the exit gas line of a gas turbine the disadvantages mentioned. This task is solved according to invention by the combination of the following, partially already well-known characteristics: a) that the Dehnungsausgleicher is united with the exhaust side of a gas turbine, their exhaust housings the end of pipe of the stretch balancer forms; b) that the ultimate waste disposal of the gas turbine is built into the interior of the hollow body; c) that the part of the circular flow channel following at the gas turbine is designed as diffuser; d) that between the exhaust housing of the gas turbine and the coat and between the two parts of the hollow body axially mobile seals elements are arranged, which exhibit at least approximately - - Nr.272004 the same diameter; e) that the parts of the Hohl_körpers are connected by radial ribs with the coat and/or with the exhaust housing, between which the medium flows through; f) that at least one of the ribs is hollow and after both sides openly, whereby the interior's building of the hollow body is connected with the surrounding atmosphere. The invention is for example described afterwards on the basis the design, which shows one on average schematiseh to the exhaust side of a gas turbine angebanten Dehnungsausgleicher. To the turbine case --35-- a gas turbine --31-- is a Rohrstüek --36-- flanged on. Over a Stopfbüehse --25-- is the Rohrstüek --36-- with a Gehänsewand --9-- connected, at which over a straight pipe --13-- a final flange --15-- is fastened. The final flange --15-- a firm Veflängerungsstüek, for example with a firm fire-place or Abhltzekessel, is if necessary connected by. A turbine camp --33-- gas densities boarding are at least approximate by one --34-- surrounded, those on the turbine case w35-- by means of for example four around 90° transferred, more narrowly, uud radially arranged ribs --39-- fell. Kind the boarding is a kegelstumpfförmig extending Ausgleichfläehe --37-- flanged on, therefore with the turbine case --35-- is rigidly connected. Upper ribs --17-- a second conical balance surface is on the gas discharge opening side --11-- with the housing wall --9-- rigidly connected. Both balance surfaces --37 and 11-- are by one between tubular beginnings --26 and 28-- 0 working StopPoüchse --27-- gas-tight and axially adjustably connected. Owing to the glands --25 and 27-- know the housing wall --9-- and the turbine case --35-- shift axially against each other. By the housing wall --9--, the pipe --36-- and the turbine case --35-- on the one hand and by the balance surfaces --11 and 37-- and the boarding --34-- on the other hand _95 becomes a circle-circular flow channel --10-- formed, that itself to circular gas turbine kana! , in which Laufund guide vanes is arranged, attaches and into the pipe --13-- flows. The inside by the balance surfaces --1! , 37-- and the boarding --34-- formed main headers! body --38-- stands over the hollow trained ribs --17-- with the atmosphere in connection. There the exit gas line of a gas turbine (pipe --13--) generally the Hohhäppen knows a large inside diameter of for example 3m on veist, also --17-- to be relatively largely dimensioned, without the current in the Strömtmgskanal --10-- to affect unfavorably. It is therefore possible, by entrance into a hollow rib --17-- to the turbine camp --33-- to arrive and make Kontrolloder revision work there. To the discharge of the glands --27 and 25-- of radial Beiastung can the balance surface --37-- at their gland-lateral end by means of schematically represented pendulum elements --41-- at the housing wall --9-- are hung up. The Endastung of the Rohrdetmungsansgleichers comes off as follows: Axial Kraft expenditure-practiced by the internal pressure on the gas turbine discharge opening stands in the equilibrium with one of the internal pressure on an appropriate surface with the gas turbine --31-- rigidly connected Ausgleiehfläche --37-- expenditure-practiced Kraft. There the balance surface --37--in axial opinion than the cross sectional area of the gas turbine discharge opening, affects an additional Kraft is larger the balance surface --37--. This becomes however by axial Kräft directed opposite on the turbine case --35--, the pipe --36-- and the Stopfoüchse --25-- in the equilibrium held. Of the Innendruek over the opening Flun --15-- on a not represented fixed point, for example a fire-place wall, expenditure-practiced Kraft affects one of the internal pressure the balance surface --1! -- as well as on the gland --25-- expenditure-practiced Kraft against. On the edge parts of the side panel bent opposite the axle --9-- expenditure-practiced forces hold themselves again in the equilibrium. Under the condition that the inside diameters of the glands --25 and 27-- equal o are at least approximate, can the diameter of the pipe --13-- and/or the opening of the final flange --15-- concerning the entrance opening, i.e. the gas discharge opening side of the gas turbine --31--, to be of any size selected. In the Auaführungsbeispiel is the opening of the final flange --15-- more largely than the Eintrlttsöffnung. The flow channel --10-- the Dehnungsausgleiehers works therefore as diffuser for the gas turbine --31--, so that a separate diffuser does not have to be planned any longer. The besehdebene endastete Dehnungsausgleicher exhibits the large advantage of a small flow resistance. Thus the Endastung is also with sudden strong Druckändertmgen, like it for example with Verpuffungen in Luftund gas lines to arise can, without noticeable delay present. The AuPoau of the Dehnungsausgleiehers is simple; the Hoklkörper is carried by hollow ribs, by which the interior is connected with the immediate atmosphere, so that via Kaminwirkung a cooling of the interior and thus the exhaustlateral camp of the gas turbine takes place. One of the ribs is appropriately in such a way arranged that it makes the entrance possible to the camp, whereby this can be controlled also during the enterprise.