Dish-Type Solar Thermal Power Generation System And Heat Collector Thereof

Abstract

A heat collector of a dish-type solar thermal power generation system and the solar thermal power generation system having the heat collector. The heat collector of the dish-type solar thermal power generation system comprises a heat collecting cavity and at least one layer of heat absorbing coil. The heat collecting cavity is provided with an opening. The heat absorbing coil forms a cavity structure. The cavity structure is provided with a hole. The cavity structure is arranged within the heat collecting cavity. The hole and the opening are aligned. A low temperature inlet of the heat absorbing coil is arranged on the cavity structure at a location where incident light energy distribution density is at maximum. The heat collector is capable of preventing ablation of the heat absorbing coil due to localized overheating and burning of the heat collector due to abrupt drop in convective heat transfer coefficient caused by phase transition of working fluid.

1 . A heat collector for a dish solar thermal power generation system, comprising a heat collecting chamber and at least one layer of heat absorbing coil,
 wherein the heat collecting chamber has an opening portion;   the heat absorbing coil forms a cavity structure with a hole, the cavity structure being placed inside the heat collecting chamber such that the hole is aligned with the opening portion;   and wherein the heat absorbing coil has a low-temperature inlet provided at a part with a maximum solar radiation energy density of the cavity structure.   
     
     
         2 . The heat collector according to  claim 1 , wherein at least two layers of the heat absorbing coil are provided. 
     
     
         3 . The heat collector according to  claim 2 , wherein there is a preset clearance between adjacent layers of the heat absorbing coil. 
     
     
         4 . The heat collector according to  claim 1 , wherein a heat absorbing rib is provided on an outer wall of the heat absorbing coil. 
     
     
         5 . The heat collector according to  claim 4 , wherein the heat absorbing rib is a straight rib or a helical rib. 
     
     
         6 . The heat collector according to  claim 1 , wherein the heat collecting chamber comprises an inner shell, an outer shell and a front covering plate,
 wherein the inner shell has an inner wall defining an inner wall of the heat collecting chamber;   the outer shell is disposed outside of the inner shell;   the front covering plate forms the opening portion of the heat collecting chamber;   the inner shell and the outer shell are fixed relative to the front covering plate, and a thermal insulation layer is provided between the inner shell, the outer shell and the front covering plate.   
     
     
         7 . The heat collector according to  claim 6 , wherein a transparent covering plate is provided at the opening portion. 
     
     
         8 . The heat collector according to  claim 6 , wherein the front covering plate is provided thereon with a cooling sheath for circulation of cooling medium. 
     
     
         9 . The heat collector according to  claim 8 , wherein the cooling sheath has a cooling-medium outlet in communication with the low-temperature inlet of the heat absorbing coil. 
     
     
         10 . The heat collector according to  claim 6 , wherein the inner wall of the heat collecting chamber is provided with a reflective coating. 
     
     
         11 . The heat collector according to  claim 6 , wherein the inner shell and the outer shell each are formed by a plurality of segments, and the plurality of segments are connected by a flange or a fastener to form an integral structure. 
     
     
         12 . The heat collector according to  claim 1 , wherein the cavity structure is of a spherical crown shape, or an inverted conical frustum shape. 
     
     
         13 . A dish solar thermal power generation system, comprising a condensing dish, a heat exchanger and the heat collector according to  claim 1 . 
     
     
         14 . The dish solar thermal power generation system according to  claim 13 , wherein at least two layers of the heat absorbing coil are provided. 
     
     
         15 . The dish solar thermal power generation system according to  claim 14 , there is a preset clearance between adjacent layers of the heat absorbing coil. 
     
     
         16 . The dish solar thermal power generation system according to  claim 13 , wherein a heat absorbing rib is provided on an outer wall of the heat absorbing coil. 
     
     
         17 . The dish solar thermal power generation system according to  claim 16 , wherein the heat absorbing rib is a straight rib or a helical rib. 
     
     
         18 . The dish solar thermal power generation system according to  claim 13 , wherein the heat collecting chamber comprises an inner shell, an outer shell and a front covering plate,
 wherein the inner shell has an inner wall defining an inner wall of the heat collecting chamber;   the outer shell is disposed outside of the inner shell;   the front covering plate forms the opening portion of the heat collecting chamber;   the inner shell and the outer shell are fixed relative to the front covering plate, and a thermal insulation layer is provided between the inner shell, the outer shell and the front covering plate.   
     
     
         19 . The dish solar thermal power generation system according to  claim 18 , wherein the inner shell and the outer shell each are formed by a plurality of segments, and the plurality of segments are connected by a flange or a fastener to form an integral structure. 
     
     
         20 . The dish solar thermal power generation system according to  claim 13 , wherein the cavity structure is of a spherical crown shape, or an inverted conical frustum shape.