Method for operating a gas and steam turbine plant and monitoring a liquid level in a plurality of downpipes

摘要

A method for operating a gas and steam turbine plant is provided. In the plant, the flue gas that escapes from a gas turbine is routed through a waste gas steam generator and where a flow medium that is used to drive a steam turbine is conducted in a flow medium circuit that includes several pressure stages. At least one of the pressure stages has an evaporator circuit with a steam collection drum that has a plurality of downpipes connected to the steam collection drum and a plurality of rising pipes downstream of the downpipes that are likewise connected to the steam collection drum and are heated by the flue gas in the waste heat steam generator. The height of the fluid column formed by the flow medium in the downpipes is monitored and a transient dry operation of the evaporator circuit can thus be detected and safeguarded against.

主权项

1. A method for operating a gas and steam turbine plant, comprising:
routing a flue gas exiting a gas turbine through a waste heat steam generator; conducting a flow medium used to drive a steam turbine in a flow medium circuit; and monitoring a height of a column of liquid formed by the flow medium in a plurality of downpipes connected to a steam collection drum, wherein the flow medium circuit comprises a plurality of pressure stages, wherein at least one of the pressure stages features an evaporator circuit including the steam collection drum with the plurality of downpipes connected to the steam collection drum and with a plurality of riser pipes connected downstream from the plurality of downpipes and connected to the steam collection drum, and wherein the plurality of riser pipes are heated by the flue gas in the waste heat steam generator.