A Supporting Structure for Flow Channels in Exhaust Cylinders of Small and Medium-sized Gas Turbines

Abstract

The invention belongs to the technical field of exhaust cylinders of gas turbines, and in particular relates to a support structure for flow passages in exhaust cylinders of small and medium-sized gas turbines. The small and medium-sized gas turbine exhaust cylinder inner runner support structure includes an outer cylinder body (1), a bearing seat (4) and an inner runner (8), and is characterized in that it also includes a support cylinder (5), a symmetrical member support rod ( 6), and an elliptical hollow rounded platform guard plate (7); the support rod (6) passes through the inner flow channel (8) and one end is connected with the bearing seat (4), and the other end is connected with the outer cylinder body (1) connection; the support tube (5) is set on the outside of the support rod (6); Slides inside the guard (7) along its axis. The support structure provided by the invention reduces the working thermal stress of the inner runner of the exhaust cylinder, prevents deformation and tearing of the inner runner, increases the stability of the support of the inner runner, and reduces the thermal stress of the support rod.

Description

technical field [0001] The invention belongs to the technical field of exhaust cylinders of gas turbines, and in particular relates to a support structure for flow passages in exhaust cylinders of small and medium-sized gas turbines. Background technique [0002] A gas turbine is mainly composed of three major components: a compressor, a combustor, and a turbine. The air enters the compressor part from the intake system, and the high-pressure air flowing through the compressor flows into the combustor for full combustion, and then passes through the turbine part to complete energy conversion, and the high-temperature gas flows through the exhaust cylinder part to the subsequent parts (in the process of raising the load of small and medium-sized gas turbines) Gas temperature is in the range of 200°C-600°C). In the current design of gas turbines, the structure of the exhaust cylinder is mainly divided into two categories due to the influence of space: one is that the heavy-du...

AI Technical Summary

Problems solved by technology

[0003] Under the effect of high temperature, due to the large thermal expansion of the inner flow channel as a thin-walled structure, excessive local stress deformation or even tearing of the flow channel will occur when the welded structure is used; if the lap joint structure is used, due to the existence of large gaps , the inner runner cannot be fixed well, and there is disturbance to the flow of high-temperature gas, which affects the vibration and operating efficiency of the whole machine

In the process of gas turbine start-up and shutdown, due to frequent changes in temperature gradient and flow rate, local thermal stress and load cycle changes, the design safety margin of welding and lap joint structures is insufficient, which may easily lead to fatigue damage such as cracks in the local area

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