Method for operating a directly heated, solar-thermal steam generator

摘要

A method for operating a directly heated, solar-thermal steam generator is provided. As per the method, a nominal value {dot over (M)}s for the supply water mass flow {dot over (M)} is conducted to an apparatus for adjusting the supply water mass flow {dot over (M)} wherein, at the adjustment of the nominal value {dot over (M)}s for the supply water mass flow {dot over (M)}, account is taken of a correction value KT, by which the thermal effects of storage or withdrawal of thermal energy in an evaporator are corrected.

主权项

1. A directly heated solar-thermal steam generator, comprising:
a control element for adjusting the supply water mass flow {dot over (M)}, which is conducted on the basis of a nominal value {dot over (M)}s for the supply water mass flow {dot over (M)}, wherein the nominal value {dot over (M)}s is determined by a heat flow balance of an evaporator, wherein the heat flow balance is a ratio of the heat flow transferred into the evaporator and a nominal increase in enthalpy desired with respect to a specified enthalpy nominal value at the evaporator outlet; wherein an associated supply water flow control is configured for adjusting the nominal value {dot over (M)}s by taking into account a correction value KT, by which the thermal effects of storage or withdrawal of thermal energy in an evaporator are corrected; and wherein a correction value KF is further taken into account, by which fluid quantities stored in or withdrawn from the evaporator tubes are further corrected, wherein KF is determined by fluid-side stored or withdrawn fluid quantities in the evaporator of the solar-thermal steam generator, or from a sum of fluid-side stored or withdrawn fluid quantities in the evaporator and economizer.