Gas turbine

摘要

This gas turbine includes a turbine cooling structure of cooling a turbine by using cooling air and a filter that reduces dust in the cooling air on an upstream side of the turbine. Furthermore, the gas turbine includes a supply pipe for supplying the cooling air to the filter, a branch pipe that is branched from the supply pipe on an upstream of the filter, and a unit that calculates or estimates a circulation amount of dust in the cooling air. In this gas turbine, at a time of start-up of a turbine, the supply pipe is closed and the branch pipe is opened, and when the circulation amount of dust in the cooling air becomes equal to or less than a predetermined threshold, the supply pipe is opened and the branch pipe is closed.

主权项

1. A gas turbine including a turbine cooling structure of cooling a turbine by using cooling air and a filter that reduces dust in the cooling air on an upstream side of the turbine, the gas turbine comprising:
a supply pipe for supplying the cooling air to the filter; a branch pipe that is branched from the supply pipe on an upstream side of the filter; and a unit that calculates or estimates a circulation amount of dust in the cooling air, wherein the supply pipe includes a first supply pipe which is disposed downstream of a branching point at which the branch pipe is branched, and a second supply pipe which is disposed upstream of the branching point, the first supply pipe includes a first valve, and the branch pipe includes a second valve, at a time of start-up of the turbine, the first supply pipe is closed and the branch pipe is opened, and when the circulation amount of dust in the cooling air becomes equal to or less than a predetermined threshold k1, the first supply pipe is opened and the branch pipe is closed.