Continuous evaporator

Abstract

A continuous evaporator for a horizontally constructed waste heat steam generator is provided. The continuous evaporator includes a first evaporator heating surface having a plurality of essentially vertically arranged first steam generator tubes through which a flow medium can flow from bottom to top, and a second evaporator heating surface which is mounted downstream of the first evaporator heating surface on the flow medium side. The second evaporator heating surface includes a plurality of additional essentially vertically arranged second steam generator tubes through which a flow medium can flow from bottom to top. The first steam generator tubes are designed in such a manner that the average mass flow density which may be controlled in the full load operation does not fall below the predetermined minimum mass flow density in the first steam generator tubes.

1 .- 8 . (canceled) 
     
     
         9 . A continuous evaporator for a horizontally constructed waste heat steam generator, comprising:
 a first evaporator heating surface which incorporates a plurality of first steam generation tubes, a first arrangement of which is essentially vertical and through which a flow is from the bottom to the top; and   a second evaporator heating surface, which on a flow substance side is connected downstream from the first evaporator heating surface and incorporates a plurality of second steam generation tubes, a second arrangement of which is essentially vertical and through which the flow is from the bottom to the top,   wherein the plurality of first steam generation tubes are designed in such a way that a mean mass flow density which is established in the plurality of first steam generation tubes when operating at full load does not fall below a prescribed minimum mass flow density.   
     
     
         10 . The continuous evaporator as claimed in  claim 9 , wherein a value of the prescribed minimum mass flow density is 100 kg/m 2 s. 
     
     
         11 . The continuous evaporator as claimed in  claim 9 , wherein an internal diameter of the plurality of first steam generation tubes is chosen such that the mean mass flow density which is established in the plurality of first steam generation tubes when operating at full load does not fall below the prescribed minimum mass flow density. 
     
     
         12 . The continuous evaporator as claimed in  claim 11 , wherein the value of the internal diameter of the plurality of first steam generation tubes is between 15 mm and 35 mm. 
     
     
         13 . The continuous evaporator as claimed in  claim 9 , wherein the plurality of first steam generation tubes are connected one after another on a heating gas side as rows of tubes. 
     
     
         14 . The continuous evaporator as claimed in  claim 9 , wherein the first evaporator heating surface is connected downstream on the heating gas side from the second evaporator heating surface. 
     
     
         15 . A waste heat steam generator, comprising:
 a continuous evaporator as claimed in  claim 9 .   
     
     
         16 . The waste heat steam generator as claimed in  claim 15 , wherein upstream from the waste heat steam generator on a heating gas side is connected a gas turbine. 
     
     
         17 . The waste heat steam generator as claimed in  claim 15 , wherein a value of the prescribed minimum mass flow density is 100 kg/m 2 s. 
     
     
         18 . The waste heat steam generator as claimed in  claim 15 , wherein an internal diameter of the plurality of first steam generation tubes is chosen such that the mean mass flow density which is established in the plurality of first steam generation tubes when operating at full load does not fall below the prescribed minimum mass flow density. 
     
     
         19 . The waste heat steam generator as claimed in  claim 18 , wherein the internal diameter of the plurality of first steam generation tubes is between 15 mm and 35 mm. 
     
     
         20 . The waste heat steam generator as claimed in  claim 15 , wherein the plurality of first steam generation tubes are connected one after another on a heating gas side as rows of tubes. 
     
     
         21 . The waste heat steam generator as claimed in  claim 15 , wherein the first evaporator heating surface is connected downstream on the heating gas side from the second evaporator heating surface.