Thermal receiver and solar thermal power generation device

Abstract

A thermal receiver includes a heat absorption body and a support body. The heat absorption body includes at least one honeycomb unit having a plurality of flow paths arranged for circulation of a heat medium. The heat absorption body includes silicon carbide. A surface of the at least one honeycomb unit to which solar light is radiated is subjected to a roughening treatment or a coating treatment. The support body accommodates and supports the heat absorption body and allows circulation of the heat medium.

1 . A thermal receiver comprising:
 a heat absorption body including at least one honeycomb unit having a plurality of flow paths arranged for circulation of a heat medium, the heat absorption body including silicon carbide, a surface of the at least one honeycomb unit to which solar light is radiated being subjected to a roughening treatment or a coating treatment; and   a support body which accommodates and supports the heat absorption body and which allows circulation of the heat medium.   
     
     
         2 . The thermal receiver according to  claim 1 ,
 wherein the roughening treatment is a blasting process treatment, and a coarsened surface is provided on the surface to which solar light is radiated.   
     
     
         3 . The thermal receiver according to  claim 2 ,
 wherein a surface roughness Ra of the coarsened surface is 0.5 μm to 5.0 μm.   
     
     
         4 . The thermal receiver according to  claim 1 ,
 wherein a black coating layer is provided on the surface to which solar light is radiated through the coating treatment.   
     
     
         5 . The thermal receiver according to  claim 4 ,
 wherein the coating layer is made of an infrared black body coating composition including an infrared radiator which includes an oxide of a transition element as a main component and including an inorganic compound having a softening temperature of 400° C. to 1000° C.   
     
     
         6 . The thermal receiver according to  claim 5 ,
 wherein the oxide of a transition element is manganese dioxide, manganese oxide, iron oxide, cobalt oxide, copper oxide, chromium oxide, or a combination thereof, and   the inorganic compound is a high expansion glass with a low melting point, which is aluminosilicate glass, potassium lead glass, soda lead glass, soda zinc glass, soda barium glass, barium glass, boron glass, strontium glass, high lead glass, potassium soda lead glass, or a combination thereof.   
     
     
         7 . The thermal receiver according to  claim 4 ,
 wherein the coating layer is a porous carbon layer.   
     
     
         8 . The thermal receiver according to  claim 4 ,
 wherein a thickness of the coating layer is 2 μm to 50 μm.   
     
     
         9 . The thermal receiver according to  claim 4 ,
 wherein a coarsened surface is provided on a surface of the coating layer through a roughening treatment.   
     
     
         10 . The thermal receiver according to  claim 9 ,
 wherein the roughening treatment provided on the surface of the coating layer is a blasting process treatment.   
     
     
         11 . The thermal receiver according to  claim 9 ,
 wherein a surface roughness Ra of the coarsened surface provided on the surface of the coating layer is 0.5 μm to 5.0 μm.   
     
     
         12 . The thermal receiver according  claim 1 ,
 wherein the plurality of flow paths are provided in the at least one honeycomb unit at 31.0 paths/cm 2  to 93.0 paths/cm 2 , and a thickness of a wall portion between each of the plurality of flow paths is 0.1 mm to 0.5 mm.   
     
     
         13 . The thermal receiver according to  claim 1 ,
 wherein the at least one honeycomb unit is made of dense silicon carbide.   
     
     
         14 . The thermal receiver according to  claim 1 ,
 wherein the at least one honeycomb unit is made of porous silicon carbide.   
     
     
         15 . The thermal receiver according to  claim 1 ,
 wherein the at least one honeycomb unit is made of porous silicon carbide having pores loaded with silicon.   
     
     
         16 . The thermal receiver according to  claim 14 ,
 wherein a porosity of the at least one honeycomb unit is 35% to 60%, and an average pore diameter is 5 μm to 30 μm.   
     
     
         17 . The thermal receiver according to  claim 1 ,
 wherein a heat insulating material is interposed between the heat absorption body and the support body.   
     
     
         18 . A solar thermal power generation device comprising the thermal receiver according to  claim 1 .