Method for the prevention of deposits in steam systems

Abstract

In a method for preventing the deposition of impurities in steam systems, in which steam of a given steam quality flowing in them is subject to temperature and/or pressure changes, a simple prevention of deposits is achieved in that an appropriate structural configuration and design of the steam systems prevents the steam solubility of the impurities present in specific concentrations in the steam from being exceeded as a result of changes in the temperature and/or pressure conditions.

1 . A method for preventing the deposition of impurities in steam systems, in which the steam of a given steam quality flowing in them is subjected to temperature and/or pressure changes, characterized in that an appropriate structural configuration and design of the steam systems prevents the steam solubility of the impurities present in specific concentrations in the steam from being exceeded as a result of changes in the temperature and/or pressure conditions within the steam system.  
     
     
         2 . The method as claimed in  claim 1 , characterized in that the impurities are silicon dioxide (SiO 2 ).  
     
     
         3 . The method as claimed in one of the above claims, characterized in that the steam system is steam cooling or steam injection of a gas turbine plant.  
     
     
         4 . The method as claimed in one of the above claims, characterized in that, additionally, the setting of temperature and/or pressure of the steam flowing in the steam system prevents the steam solubility of the impurities present in specific concentrations in the steam from being exceeded in the steam system.  
     
     
         5 . The method as claimed in one of the above claims, characterized in that the structural configuration and design of the steam systems act in such a way that the pair of values, namely the pressure and temperature of the steam in the steam system, never assumes a value at which the steam solubility of the impurities present in specific concentrations in the steam is exceeded, and in that particularly critical regions with significant pressure drops, without a simultaneous equivalent rise in temperature of the steam, are avoided.  
     
     
         6 . The method as claimed in  claim 5 , characterized in that a drop in the pressure such that the steam solubility of the impurities present in specific concentrations in the steam would be exceeded is compensated by a corresponding rise in the temperature.  
     
     
         7 . The method as claimed in one of the above claims, characterized in that, as regards steam/air mixtures, the partial pressure of the steam in the mixture is to be taken into account as the pressure quantity.  
     
     
         8 . The method as claimed in one of the above claims, characterized in that the sole critical pressure drop in the steam system is placed at the outlet point of the steam from the device for the use of steam.  
     
     
         9 . The method as claimed in  claim 8 , characterized in that the flow velocity of the steam at the outlet point of the steam from the device for the use of steam is so high that a self-cleaning effect is established at the outlet point.  
     
     
         10 . A steam system for carrying out a method as claimed in one of  claims 1  to  9 .