Solar photo-thermal receiving device

Abstract

A solar photo-thermal receiving device, consisting of a sealed structure ( 1 ) and a solar photo-thermal receiver ( 2 ) inside the sealed structure ( 1 ); the solar photo-thermal receiver ( 2 ) includes a secondary absorption heat-exchange pipe ( 17 ) and a primary absorption heat-exchange pipe ( 16 ); the temperature of a heat exchange medium inside the secondary absorption heat-exchange pipe ( 17 ) is lower than that of a heat exchange medium inside the primary absorption heat-exchange pipe ( 16 ); the secondary absorption heat-exchange pipe ( 17 ) receives the heat energy released by the primary absorption heat-exchange pipe ( 16 ) and/or receives the solar heat not received by the primary absorption heat-exchange pipe ( 16 ); the solar photo-thermal receiving device takes the heat away via the heat-exchange medium flowing inside the pipes of the solar photo-thermal receiver ( 2 ). The solar photo-thermal receiving device can be applied in a through type, a Fresnel array and a tower type solar photo-thermal concentration system.

What is claimed is: 
     
         1 . A solar photo-thermal receiving device, consisting of a sealed structure and a solar photo-thermal receiver inside the sealed structure, wherein the solar photo-thermal receiver comprises a secondary absorption heat-exchange pipe and a primary absorption heat-exchange pipe, the temperature of a heat exchange medium inside the secondary absorption heat-exchange pipe is lower than that of a heat exchange medium inside the primary absorption heat-exchange pipe; the secondary absorption heat-exchange pipe receives the heat energy released by the primary absorption heat-exchange pipe and/or receives the solar heat not received by the primary absorption heat-exchange pipe; the solar thermal receiving device takes the heat away via the heat-exchange medium flowing inside the pipes of the solar photo-thermal receiver. 
     
     
         2 . The solar photo-thermal receiving device according to  claim 1 , wherein the solar photo-thermal receiver further comprises a secondary concentration device arranged between the secondary absorption heat-exchange pipe and the primary absorption heat-exchange pipe, and the secondary concentration device assists the primary absorption heat-exchange pipe in obtaining more concentration heat. 
     
     
         3 . The solar photo-thermal receiving device according to  claim 1 , wherein the solar photo-thermal receiving device is a linear solar receiving device, which is composed of at least one linear solar photo-thermal receiver arranged at a focal line of a linear concentration system. 
     
     
         4 . The solar photo-thermal receiving device according to  claim 2 , wherein the solar photo-thermal receiving device is a linear solar receiving device, which is composed of at least one linear solar photo-thermal receiver arranged at a focal line of a linear concentration system. 
     
     
         5 . The solar photo-thermal receiving device according to  claim 3 , wherein the secondary absorption heat-exchange pipe has a plurality of array-arranged metal tubes. 
     
     
         6 . The solar photo-thermal receiving device according to  claim 4 , wherein the secondary absorption heat-exchange pipe has a plurality of array-arranged metal tubes. 
     
     
         7 . The solar photo-thermal receiving device according to  claim 3 , wherein the heat exchange medium flows through the secondary absorption heat-exchange pipe, and then flows through the primary absorption heat-exchange pipe. 
     
     
         8 . The solar photo-thermal receiving device according to  claim 4 , wherein the heat exchange medium flows through the secondary absorption heat-exchange pipe, and then flows through the primary absorption heat-exchange pipe. 
     
     
         9 . The solar photo-thermal receiving device according to  claim 1 , wherein a thermal insulation device is arranged at the rear of the secondary absorption heat-exchange pipe. 
     
     
         10 . The solar photo-thermal receiving device according to  claim 2 , wherein a thermal insulation device is arranged at the rear of the secondary absorption heat-exchange pipe. 
     
     
         11 . The solar photo-thermal receiving device according to  claim 2 , wherein the secondary absorption heat-exchange pipe is arranged close to the secondary concentration device. 
     
     
         12 . The solar photo-thermal receiving device according to  claim 2 , wherein the sealed structure comprises a cover glass arranged at an opening of the secondary concentration device of the solar photo-thermal receiver, a coating material for covering the back of the solar photo-thermal receiver, and an end plate of the solar photo-thermal receiving device, all three of them form a closed space. 
     
     
         13 . The solar photo-thermal receiving device according to  claim 2 , wherein the sealed structure is closed at both ends, and is composed of one or more glass pipes in series. 
     
     
         14 . The solar photo-thermal receiving device according to  claim 1 , wherein the internal space of the sealed structure is in a micro positive pressure state. 
     
     
         15 . The solar photo-thermal receiving device according to  claim 2 , wherein the internal space of the sealed structure is in a micro positive pressure state. 
     
     
         16 . The solar photo-thermal receiving device according to  claim 1 , wherein the inside of the sealed structure is in a static vacuum state or in a dynamic vacuum state. 
     
     
         17 . The solar photo-thermal receiving device according to  claim 2 , wherein the inside of the sealed structure is in a static vacuum state or in a dynamic vacuum state. 
     
     
         18 . The solar photo-thermal receiving device according to  claim 1 , wherein the heat exchange medium flowing inside the solar photo-thermal receiver is heat transfer oil, molten salt, water or gas. 
     
     
         19 . The solar photo-thermal receiving device according to  claim 2 , wherein the heat exchange medium flowing inside the solar photo-thermal receiver is heat transfer oil, molten salt, water or gas. 
     
     
         20 . The solar photo-thermal receiving device according to  claim 1 , wherein the solar photo-thermal receiving device is applied in a through solar photo-thermal concentration system, a Fresnel array solar photo-thermal concentration system and a tower type solar photo-thermal concentration system.