DE-102024210832-A1 - Deflection housing arrangement for a steam turbine arrangement and steam turbine arrangement comprising such a deflection housing arrangement

Abstract

The invention relates to a deflection housing arrangement (1) for a steam turbine arrangement (2), wherein the steam turbine arrangement (2) comprises at least one condensing turbine (3), at least one water-cooled condenser (4), and at least one air-cooled condenser (5). The deflection housing arrangement (1) comprises a deflection housing (6), wherein the deflection housing (6) has at least one axial passage (8) relative to the turbine axis (7) through which steam can flow from the condensing turbine (3) to the air-cooled condenser (5), and at least one radial passage (9) relative to the turbine axis (7) through which steam can flow from the condensing turbine (3) to the water-cooled condenser (4). Furthermore, the deflection housing arrangement (1) comprises at least one shut-off device (10) which enables a vacuum-tight seal of the axial passage (8). Furthermore, the invention relates to a steam turbine arrangement (2) with such a deflection housing arrangement (1).

Inventors

• Ingo Assmann
• Frank Lehmann

Assignees

• Siemens Energy Global GmbH & Co. KG

Dates

Publication Date

20260513

Application Date

20241112

Claims (7)

1. A deflection housing arrangement (1) for a steam turbine arrangement (2), wherein the steam turbine arrangement (2) comprises at least one condensing turbine (3), at least one water-cooled condenser (4), and at least one air-cooled condenser (5), characterized in that the deflection housing arrangement (1) comprises a deflection housing (6), wherein the deflection housing (6) has at least one axial passage (8) to the turbine axis (7) through which steam can flow from the condensing turbine (3) to the air-cooled condenser (5), and has at least one radial passage (9) to the turbine axis (7) through which steam can flow from the condensing turbine (3) to the water-cooled condenser (4), and wherein at least one shut-off device (10) is provided, which vacuum-tight sealing of the axial passage (8) is enabled.
2. Deflection housing arrangement (1) according Claim 1 , characterized in that the shut-off device (10) comprises a plug disc and/or a vacuum-tight shut-off valve.
3. Deflection housing arrangement (1) according Claim 2 , characterized in that the plug-in disc comprises a radial deflecting diffuser (11).
4. Deflection housing arrangement (1) according to one of the preceding claims, characterized in that a further opening (12) for introducing bypass steam is provided in the deflection housing (6).
5. Deflection housing arrangement (1) according to one of the preceding claims, characterized in that the shut-off device (10) comprises an automatic switching device depending on predefinable parameters.
6. Deflection housing arrangement (1) according Claim 5 , characterized in that a predefinable parameter is the flow temperature of the water-cooled condenser and/or the available amount of cooling water.
7. Steam turbine arrangement (2) comprising a deflection housing arrangement (1) according to one of the preceding claims, characterized in that the condensing turbine (3), the deflection housing (6) and the shut-off device (10) are arranged inside a machine house or under a weather protection hood on a table top/ a foundation/ a frame (13) and the water-cooled condenser (4) is arranged below or laterally next to the table top/ the foundation/ the frame (13) inside the machine house or weather protection hood.

Description

The invention relates to a deflection housing arrangement for a steam turbine arrangement according to the preamble of independent claim 1 and to a steam turbine arrangement with such a deflection housing arrangement according to the preamble of independent claim 7. In particular, the invention relates to a solution for the efficient condensation of the exhaust steam from a condensing turbine, wherein the steam is condensed in a condenser downstream of the condensing turbine. There are two basic types of condensers used in such steam turbine arrangements: air-cooled condensers and water-cooled condensers. Due to ongoing global climate change, water levels and flow in rivers and canals are rapidly decreasing during the summer months. At the same time, temperatures in these waters are reaching record highs, which, due to legal limits, prohibits both the extraction of cooling water and the discharge of heated cooling water. These circumstances are driving the increasing use of hybrid cooling systems that combine both air- and water-cooled condensers. To offer and implement a cost-effective and operationally optimized solution for industrial steam turbines, the installation configuration described below was developed. This configuration combines a water-cooled condenser, which operates from late summer to early summer, with an air-cooled condenser, which operates during the height of summer. This combination presents particular challenges for the design of the steam turbine set and its subsequent installation. The decisive factor is the significant difference in the vacuum generated during operation with these hybrid units: approximately 15 to 80 mbar during exhaust steam condensation with cooling water, compared to approximately 150 to 300 mbar during exhaust steam condensation with air. For air condensers, the use of axial exhaust housings has become the global standard. This takes into account the fact that air condensers require a certain installation height (air intake from below), and therefore the use of axial exhausts on a relatively low turbine table or block foundation enables optimal flow and transfer of the exhaust steam to the air condenser, resulting in low flow and pressure losses. When using water-cooled condensers, which are often located below the table, the use of radial exhaust housings is still frequently preferred. To operate a hybrid system with a deep vacuum when coupled to the water-cooled condenser, isolating the air-cooled condenser is essential. Otherwise, leaks in the air-cooled condenser will repeatedly break the vacuum, significantly shortening the expansion phase. Operating with the air-cooled condenser is expected to result in power losses of up to 15% of the nominal power. To enable the future implementation of hybrid condensate systems consisting of water- and air-cooled condensers with optimized design and installation, axial discharge is preferred. Previously, hybrid cooling systems were used in conjunction with steam extraction, requiring switching between a water-cooled condenser and an air-cooled condenser. Initially, ball valves were used to switch the exhaust steam lines, but these proved unreliable due to rust and dirt deposits. The subsequent conversion to large butterfly valves was very expensive and only partially solved the technical problem. One possible solution would be to use a so-called hotbox for connecting the air condenser when water-cooled condensers are mounted side-by-side or horizontally. However, this solution leads to a significant increase in the volume of the nacelle or weatherproof enclosure and is therefore very expensive. Furthermore, the exhaust cross-section must be reinforced to prevent vacuum drafts and implosion, which results in increased losses and thus a considerable reduction in performance. A shortage of cooling water leads to inefficient partial load operation or even the shutdown of steam power plants. A continuous supply of process steam is then only possible via highly inefficient bypass steam systems. The object of the present invention is to provide an improved deflector housing arrangement for a steam turbine assembly, enabling an efficient and cost-effective solution for operation with hybrid cooling systems. Furthermore, it is an object of the present invention to provide a steam turbine assembly with such a deflector housing arrangement. The task is defined with regard to the deflection housing arrangement by the features of the independent The requirements of claim 1 and the steam turbine arrangement are solved by the features of independent claim 7. Further embodiments of the invention, which can be used individually or in combination with each other, are the subject of the dependent claims. The deflection housing arrangement according to the invention for a steam turbine arrangement, wherein the steam turbine arrangement comprises at least one condensing turbine, at least one water-cooled condenser, and at least one air-coo