Gas turbine

摘要

A compressor compresses air to produce compressed air. A mixture of fuel and the compressed air is combusted in a combustor to produce combustion gas. The combustion gas is supplied to a turbine to obtain rotational power. High-temperature gas accumulated in a space partitioned by an exhaust-side bearing portion that rotatably supports a turbine shaft and an exhaust diffuser is discharged through an exhaust gas passage. The high-temperature gas is sucked into the exhaust gas passage by exhaust gas flowing in the exhaust diffuser.

主权项

1. A gas turbine, comprising:
a compressor configured to compress air to produce compressed air; a combustor configured to combust a mixture of fuel and the compressed air to produce combustion gas; a turbine having a turbine shaft configured to be rotationally driven by the combustion gas; an exhaust diffuser configured to exhaust the combustion gas, as exhaust gas, from the turbine; an exhaust-side bearing portion rotatably supporting the turbine shaft; and an exhaust gas passage through which high-temperature gas accumulated in a space partitioned by the exhaust-side bearing portion and the exhaust diffuser is to be discharged, wherein the high-temperature gas is arranged to be sucked into the exhaust gas passage by the exhaust gas flowing in the exhaust diffuser, the space is partitioned by
a bearing box defining the exhaust-side bearing portion,an inner cylindrical portion of the exhaust diffuser, anda partition wall that connects end portions of the bearing box and the inner cylindrical portion on a side of the turbine, the exhaust gas passage includes a plurality of exhaust holes formed on the partition wall, the gas turbine further comprises a flow-rate control unit configured to control a flow rate of the high-temperature gas through at least one of the plurality of exhaust holes, the gas turbine further comprises a plurality of exhaust connecting pipes which are connected at first ends to the plurality of exhaust holes, project into the space and include the flow-rate control unit, each of the plurality of exhaust connecting pipes includes a pipe portion bent at a right angle, second ends of the exhaust connecting pipes disposed on an upper side of the partition wall face downward in a circumferential direction of the partition wall, and second ends of the exhaust connecting pipes disposed on a lower side of the partition wall face downward.