Heat exchanger for steam generation for a solar thermal power plant

Abstract

A heat exchanger for generating a steam flow for a solar-thermal power plant, including a casing for receiving a casing-side fluid, pipes arranged within the casing for a pipe-side fluid, and a fluid inlet conduit which is connected to an inlet opening for the casing-side fluid and which encloses at least a part of the pipes in such a manner that the fluid inlet conduit is configured as a preheater and/or a flow director for the casing-side fluid entering the casing, wherein heat is transmitted via the pipes from the pipe-side fluid to the casing-side fluid. The casing-side fluid is water, and the pipe-side fluid is a thermal oil or salt.

1 . A heat exchanger for generating a steam flow for a solar thermal power plant, comprising:
 a casing configured for receiving a casing-side fluid;   pipes arranged within the casing for a pipe-side fluid; and   a fluid inlet conduit which is connected to an inlet opening for the casing-side fluid and which encloses at least a part of the pipes in such a manner that the fluid inlet conduit is configured as a preheater and/or a flow director for the casing-side fluid entering the casing; wherein   a separation of a water vapor from a liquid phase occurs outside of the casing in a separate steam drum;   the casing-side fluid is water;   the pipe-side fluid is a thermal oil or a salt;   heat is transmitted via the pipes from the pipe-side fluid to the casing-side fluid;   the fluid inlet conduit is arranged entirely inside the casing;   the pipes are configured as a horizontal meandering pipe bundle;   the pipes comprise, on the inlet side, a distributor via which the heat-emitting fluid is directed into the individual pipes and, on the outlet side, a header by means of which the pipes are separated from one another;   the steam drum is arranged above the heat exchanger and is coupled by means of riser pipes and downpipes to the heat exchanger in such a manner that a natural circulation occurs; and   the heat exchanger is configured for use in a solar-thermal power plant.   
     
     
         2 . (canceled) 
     
     
         3 . The heat exchanger according to  claim 1 , wherein the fluid inlet conduit is configured as a a flow director for the casing-side fluid entering the casing. 
     
     
         4 . The heat exchanger according to  claim 1 , wherein the fluid inlet conduit encloses approximately ⅛ of the surfaces of the pipes. 
     
     
         5 . The heat exchanger according to  claim 1 , further comprising a fluid outlet conduit, which is configured as a flow director and/or water separator for the casing-side fluid exiting the casing. 
     
     
         6 - 7 . (canceled) 
     
     
         8 . The heat exchanger according to  claim 1 , wherein the steam drum has a fresh water inlet. 
     
     
         9 . The heat exchanger according to  claim 1 , wherein the meandering pipe bundle is configured as a three-way pipe bundle