US 9,518,481 B2 · Method for operating a recirculating waste heat steam generator

Abstract

A method for operating a recirculating waste heat steam generator is provided, in which in a pressure stage of the recirculating waste heat steam generator, the feed water mass flow is guided on the basis of a specified desired value in order to control the water level in a drum. The method should give a recirculating waste heat steam generator a particularly high degree of efficiency and simultaneously a particularly high level of operational flexibility. For this purpose the thermal input introduced into an evaporator of the pressure stage is used as input variable in the determination of the desired value.

Claims17

Dependent claims

A method for operating a recirculating waste heat steam generator comprising,

determining a specified desired value,
managing the feedwater mass flow in a pressure stage of the recirculating waste heat steam generator on the basis of the specified desired value in order to control the water level in a drum,
wherein the thermal power introduced into an evaporator of the pressure stage is used as an input variable in the determination of the desired value,
wherein, in the determination of the thermal power introduced into the evaporator of the pressure stage, a flue gas mass flow and a difference in the specific enthalpy of the flue gas at an inlet and outlet of the evaporator of the pressure stage are used, and
wherein, in the determination of the specific enthalpy of the flue gas at the outlet of the evaporator, a saturation temperature of the flow medium is used as an input variable.

2 more elements

Dependencies are inferred from the claim text.

Method for operating a recirculating waste heat steam generator

Life of this patent

Method for operating a recirculating waste heat steam generator

Life of this patent

Abstract

Claims17