Method and device for determining the enthalpy of wet steam

A measurement and calculation method for determining an enthalpy of a wet steam, which comprises:

• mixing, for sampling purposes, a part volume flow of the wet steam with a reference gas causing liquid constituents of the part volume to flow evaporate completely and resulting in a mixture formed from the reference gas and the part volume of the wet steam;
• regulating at least one of a pressure, a temperature and a quantity of the reference gas in dependence on at least one of a relative humidity and a position of a state point of the mixture;
• determining an enthalpy of the reference gas and an enthalpy of the mixture from measured physical variables;
• and
• calculating an enthalpy of the wet steam from the enthalpy of the reference gas and the enthalpy of the mixture.

A measurement and calculation method for determining an enthalpy of a wet steam, which comprises;

• introducing the wet steam and a reference gas into a mixing stage;
• mixing, for sampling purposes, a part volume flow of the wet steam with the reference gas causing liquid constituents of the part volume flow to evaporate completely and resulting in a mixture formed from the reference gas and the part volume of the wet steam;
• determining an enthalpy of the reference gas and an enthalpy of the mixture from measured physical variables, determining the enthalpy of the mixture at an end of the mixing stage;
• and
• calculating an enthalpy of the wet steam from the enthalpy of the reference gas and the enthalpy of the mixture.

A measurement and calculation method for determining an enthalpy of a wet steam, which comprises:

• mixing, for sampling purposes, a part volume flow of the wet steam with the reference gas causing liquid constituents of the part volume flow evaporating completely and resulting in a mixture formed from the reference gas and the part volume of the wet steam;
• determining an enthalpy of the reference gas and an enthalpy of the mixture from measured physical variables;
• calculating an enthalpy of the wet steam from the enthalpy of the reference gas and the enthalpy of the mixture;
• and
• calculating the enthalpy of the wet steam continuously, taking into account a mass flow of the wet steam and of the reference gas.

A measurement and calculation method for determining an enthalpy of a wet steam, which comprises:

• mixing, for sampling purposes, a part volume flow of the wet steam with the reference gas causing liquid constituents of the part volume flow to evaporate completely and resulting in a mixture formed from the reference gas and the part volume of the wet steam;
• determining an enthalpy of the reference gas and an enthalpy of the mixture from measured physical variables;
• calculating an enthalpy of the wet steam from the enthalpy of the reference gas and the enthalpy of the mixture;
• and
• calculating the enthalpy of the wet steam quasi-continuously, taking into account a mass flow of the wet steam and of the reference gas.

A measurement and calculation method for determining an enthalpy of a wet steam at an outlet of a steam turbine, which comprises:

• mixing, for sampling purposes, a part volume flow of the wet steam with hot steam causing liquid constituents of the part volume flow to evaporate completely and resulting in a mixture formed from the hot steam and the part volume of the wet steam;
• determining an enthalpy of the hot steam and an enthalpy of the mixture from measured physical variables;
• and
• calculating an enthalpy of the wet steam from the enthalpy of the hot steam and the enthalpy of the mixture.