Module for a thermal absorber of a solar receiver, absorber comprising at least one such module and receiver comprising at least one such absorber

Abstract

An absorber for a solar receiver with a casing of lengthways axis including at a first lengthways end, a collector to supply a heat transfer fluid; and at a second lengthways end, a collector for evacuating the heat transfer fluid. The casing includes a first wall having a face intended to be subjected to a luminous flux, a second wall facing the first wall, and side walls connecting said the first and second walls. The casing is formed by at least one rib extending lengthways, and attached to the first and to the second wall. The at least one rib includes windows, and deflectors associated with the windows. The deflectors cause a portion of the heat transfer fluid to flow through the windows, causing reblending of the heat transfer fluid.

1 - 21 . (canceled) 
     
     
         22 . A module for the production of a thermal absorber for a solar receiver of a solar power plant of the Fresnel type, with a lengthways axis, comprising a single duct delimiting by a first roughly flat wall having a face intended to be subjected to a luminous flux, a second wall opposite the first wall, side walls connecting said first and second walls, said module being delimited at its lengthways ends by transverse end planes at which points said module is configured to be connected to upstream and/or downstream modules, and/or to collectors for the supply and/or evacuation of a heat transfer fluid intended to flow in the module, said heat transfer fluid being pressurised, and said module comprising connectors rigidly connecting the first and second walls, said connectors being positioned in the flow of the heat transfer fluid, and deflectors to enable the heat transfer fluid to flow in directions which are inclined relative to the lengthways axis, in such manner that a internal blending of the heat transfer fluid is ensured in order to homogenise the output temperature of the heat transfer fluid and the temperature of the first wall. 
     
     
         23 . A module according to  claim 22 , in which the pressure of the heat transfer fluid in the module is between  2  Bar and  6  Bar. 
     
     
         24 . A module according to  claim 22 , in which the deflectors are inclined relative to those of the lengthways axis and are distributed throughout the volume of the module, and cause the fluid to change direction. 
     
     
         25 . A module according to  claim 22 , comprising at least one rib extending lengthways, attached to the first and to the second wall, said rib comprising windows and deflectors associated with the windows, said deflectors causing a portion of the fluid to flow through said windows. 
     
     
         26 . A module according to  claim 25 , in which said at least one rib extends in a lengthways direction along the entire length of said module, delimiting two half-channels which are in fluid communication. 
     
     
         27 . A module according to  claim 25 , in which the rib is produced from a metal alloy strip from which the deflectors, are cut, said deflectors being folded such that they are inclined relative to the lengthways axis and open up the windows. 
     
     
         28 . A module according to  claim 25 , in which two deflectors in succession are located on either side of the plane of the rib. 
     
     
         29 . A module according to  claim 25 , in which the rib is welded on one side to the internal face of the first wall, said rib comprising on its side welded to the second wall tabs inserted into notches made in said second wall. 
     
     
         30 . A module according to  claim 22 , having a roughly rectangular parallelepipedic shape, the first and second walls being of larger areas. 
     
     
         31 . A module according to  claim 22 , in which the face intended to be subjected to the luminous flux comprises a coating improving absorption of the luminous flux. 
     
     
         32 . A module according to  claim 31 , in which the coating has low infrared emissivity properties. 
     
     
         33 . A thermal absorber for a solar receiver of a solar power plant comprising one or more modules according to  claim 22 , the modules being connected in series in sealed fashion, and said absorber comprising, at a first lengthways end, a heat transfer fluid supply collector and, at a second lengthways end, a heat transfer fluid evacuation collector. 
     
     
         34 . A solar receiver comprising at least one absorber according to  claim 33  and a skirt formed from two inclined panels at some distance from the lengthways axis, positioned either side of the absorber relative to the lengthways axis, said skirt redirecting the luminous flux on to the absorber. 
     
     
         35 . A solar receiver according to  claim 34 , comprising thermal insulator positioned outside the absorber on the second wall and on the sides of the latter. 
     
     
         36 . A solar receiver according to  claim 34 , which is of the Fresnel type. 
     
     
         37 . A method of manufacturing an absorber according to  claim 33 , comprising the following steps:
 manufacture of one or more modules,   attachment of the mechanical connection means to the first and second walls, and installation of the means to enable flows in directions which are inclined relative to the lengthways axis (X),   installation of the supply and evacuation collectors at the ends of the assembly formed by the module or modules.   
     
     
         38 . A manufacturing method according to  claim 37 , in which the mechanical connectors and the deflectors are made from a metal alloy strip:
 by cutting vanes from the strip, where said vanes are attached on one side to the strip, and   by folding said vanes such that they form an angle with the plane of the strip, where the production of said vanes simultaneously forms windows in the strip.   
     
     
         39 . A manufacturing method according to  claim 37 , in which the mechanical connectors are attached by welding. 
     
     
         40 . A manufacturing method according to  claim 37 , comprising a step of surface treatment of the outer face of the first wall. 
     
     
         41 . A manufacturing method according to the  claim 40 , in which said surface treatment is accomplished by painting said face after manufacturing the module or modules. 
     
     
         42 . A method of manufacturing a solar receiver, where said method comprises:
 the step of manufacturing multiple absorbers by the manufacturing method according to  claim 37 ,   the step of sealed connection by welding of said absorbers by their collectors.