Method And Arrangement For Operating A Steam Turbine Plant In Combination With Thermal Water Treatment

Abstract

A system and method are provided for operating a steam turbine plant in combination with a thermal water treatment plant having a first condenser for condensing raw water from exhaust gas of a steam turbine, an evaporator for operation with raw water and air, wherein transfers of material and heat occur in the evaporator, a tank for receiving the raw water with increased concentrations of impurities, a second condenser for condensing the pure water from the air downstream of the evaporator, and at least one steam turbine for operation with the purified water.

What is claimed is: 
     
         1 . A method for operating a steam turbine plant in combination with a thermal water treatment plant, the method comprising:
 condensing steam from the stream turbine plant to raw water in a first condenser,   adding a carrier gas and at least one fraction of the raw water to an evaporator, wherein mass transfer and heat exchange between the raw water and the carrier gas occurs in the evaporator,   conducting the raw water and the carrier gas in counter flow in the evaporator, wherein the carrier gas heats up in the evaporator and takes up pure water from the raw water and the raw water cools and the contaminants concentrate,   collecting the raw water with the concentrated contaminants downstream of the evaporator in a tank,   conducting the carrier gas loaded with pure water into a second condenser,   condensing purified water from the carrier gas in the second condenser, wherein the second condenser is cooled by the raw water from the tank,   conducting the purified water into a steam circuit of the steam turbine plant,   conducting the preheated raw water from the second condenser to a first heater, wherein heat from the steam turbine plant or the steam circuit transfers to the preheated raw water, and   conducting the preheated raw water from the heater into the evaporator.   
     
     
         2 . The method of  claim 1 , wherein the raw water comprises ammonia, and the pH of the raw water is adjusted to be acidic such that the ammonia in the evaporator remains in the raw water. 
     
     
         3 . The method of  claim 1 , wherein the raw water comprises ammonia, and the pH of the raw water is adjusted to the basic such that the ammonia transfers into the carrier gas. 
     
     
         4 . The method of  claim 1 , comprising adding fresh raw water to the tank. 
     
     
         5 . The method of  claim 4 , wherein the fresh raw water is condensate water from the exhaust gas of the steam turbine, river water, seawater, or wastewater. 
     
     
         6 . The method of  claim 1 , wherein the temperature of the raw water in the evaporator is in the range of 60° C. to 100° C. 
     
     
         7 . The method of  claim 1 , comprising operating the heater with the heat of the exhaust gas of a steam generator of the steam circuit. 
     
     
         8 . The method of  claim 1 , comprising using air as the carrier gas. 
     
     
         9 . A system for operating a steam turbine plant in combination with a thermal water treatment plant, the system comprising:
 a first condenser configured to condense steam from the steam turbine plant to raw water,   an evaporator configured to operate with raw water and a carrier gas, wherein mass transport and heat exchange occurs in the evaporator,   a tank configured to collect the raw water that is concentrated with contaminants,   a second condenser configured to condense the pure water from the carrier gas downstream of the evaporator, and   at least one steam turbine configured to operate with at least a fraction of the purified water.   
     
     
         10 . The system of  claim 9 , wherein the evaporator is a falling-film evaporator or a trickle-flow evaporator.