Patent ID: 9593844
Date: 2017-03-14
CPC Classifications: F01K,F22B,Y02E

Claim:
1. A method for operating a waste heat steam generator, comprising: providing the waste heat steam generator with an evaporator, an economizer with a first plurality of economizer heating surfaces, and a bypass line connected in parallel with a second plurality of economizer heating surfaces on a flow medium side; and using a variable that is characteristic of a thermal energy supplied to the waste heat steam generator to control or regulate a flow rate through the bypass line, and wherein a power output of a gas turbine connected upstream of the waste heat steam generator on a flue gas side is used as the characteristic variable for the thermal energy supplied to the waste heat steam generator, wherein a temperature device and pressure device are provided at the inlet to the evaporator in order to respectively measure the temperature and pressure at the inlet to the evaporator, wherein the temperature device and pressure device at the evaporator inlet are used for controlling or regulating the flow rate through the bypass line, wherein a saturation temperature in the evaporator, determined from the pressure measurement at the evaporator inlet, is used for controlling or regulating the flow rate through the bypass line, and wherein as a result of the controlling or regulating the flow rate through the bypass line the temperature at the inlet to the evaporator includes a deviation from the saturation temperature.