Heat exchanger

Abstract

A stacked plate type heat exchanger having compactness and providing a heat exchanging rate per unit volume of 10 MWt/m 3 or more is used under conditions of high temperature and high pressure of 4 to 7 MPa of pressure difference between a primary fluid and a secondary fluid, and 500° C. to 900° C. of maximum operating temperature. A thickness of metal plate is set at 0.3 times or more of an equivalent diameter of a flow path, and a pitch between flow paths along a width direction of the metal plate is set at 0.5 times or more of the equivalent diameter of the flow path.

1 . A heat exchanger comprising a flow path member which is formed by stacking and bonding metal plates which is subjected to a groove-forming processing, the grooves being formed as a primary flow path and a secondary flow path for heat exchange between the metal plates of the flow path member, wherein a heat exchanging rate per unit volume between both fluids flowing through the respective flow paths is set at 10 MWt/m 3  or more, a thickness of the metal plate is set at 0.3 times or more of an equivalent diameter of the flow path, and a pitch between the flow paths along a width direction of the metal plate is set at 0.5 times or more of the equivalent diameter of the flow path. 
   
   
       2 . The heat exchanger according to  claim 1 , wherein the primary flow path and the secondary flow path are provided, respectively, with fluid inlet ports and fluid outlet ports at surfaces of a main heat exchange portion of the flow path member along flow directions of the fluids. 
   
   
       3 . The heat exchanger according to  claim 1 , wherein the flow path member is provided with plenum portions for branching or combining the primary flow path and the secondary flow path, and the fluid inlet ports and the fluid outlet ports of the primary flow path and the secondary flow path, respectively, communicating with the plenum portions are provided at surfaces of the main heat exchange portion of the flow path member along flow directions of the fluids or at surfaces thereof along directions perpendicular to the flow directions of the fluids. 
   
   
       4 . The heat exchanger according to  claim 1 , wherein the primary flow path and the secondary flow path are wave-shaped flow paths. 
   
   
       5 . The heat exchanger according to  claim 1 , wherein the respective flow paths are provided with bent portions in which a guide vane or a reinforcement material for guiding each of the fluids along the bent portion. 
   
   
       6 . The heat exchanger according to  claim 1 , wherein the primary flow path and the secondary flow path have cross sectional shapes formed in semicircle, tetragon, hexagon, or other polygon shape. 
   
   
       7 . The heat exchanger according to  claim 1 , wherein the primary flow path and the secondary flow path have cross sectional areas which are set to be equal with each other, or are set such that a cross sectional area of the secondary flow path is larger than a cross sectional area of the primary flow path. 
   
   
       8 . The heat exchanger according to  claim 1 , wherein at least one of the primary flow path and the secondary flow path is formed as a reciprocating flow path in a U-shape, and both front end portions of the reciprocating flow path communicate with the fluid inlet port or the fluid outlet port or with the plenums provided on a same surface of the flow path member. 
   
   
       9 . The heat exchanger according to  claim 1 , wherein the grooves formed as the primary flow path or the secondary flow path are formed in a manner arranged adjacent to each other on the same metal plate. 
   
   
       10 . A heat exchanger comprising a flow path member which is formed by stacking and bonding metal plates which is subjected to a groove-forming processing, the grooves being formed as a primary flow path and a secondary flow path for heat exchange between the metal plates of the flow path member, wherein the metal plate is composed of an iron-based oxide dispersion strengthened alloy containing chromium and aluminum. 
   
   
       11 . The heat exchanger according to  claim 10 , wherein the primary flow path and the secondary flow path are provided, respectively, with fluid inlet ports and fluid outlet ports at surfaces of a main heat exchange portion of the flow path member along flow directions of the fluids. 
   
   
       12 . The heat exchanger according to  claim 10 , wherein the flow path member is provided with plenum portions for branching or combining the primary flow path and the secondary flow path, and the fluid inlet ports and the fluid outlet ports of the primary flow path and the secondary flow path, respectively, communicating with the plenum portions are provided at surfaces of the main heat exchange portion of the flow path member along flow directions of the fluids or at surfaces thereof along directions perpendicular to the flow directions of the fluids. 
   
   
       13 . The heat exchanger according to  claim 10 , wherein the primary flow path and the secondary flow path are wave-shaped flow paths. 
   
   
       14 . The heat exchanger according to  claim 10 , wherein the respective flow paths are provided with bent portions in which a guide vane or a reinforcement material for guiding each of the fluids along the bent portion. 
   
   
       15 . The heat exchanger according to  claim 10 , wherein the primary flow path and the secondary flow path have cross sectional shapes formed in semicircle, tetragon, hexagon, or other polygon shape. 
   
   
       16 . The heat exchanger according to  claim 10 , wherein the primary flow path and the secondary flow path have cross sectional areas which are set to be equal with each other, or are set such that a cross sectional area of the secondary flow path is larger than a cross sectional area of the primary flow path. 
   
   
       17 . The heat exchanger according to  claim 10 , wherein at least one of the primary flow path and the secondary flow path is formed as a reciprocating flow path in a U-shape, and both front end portions of the reciprocating flow path communicate with the fluid inlet port or the fluid outlet port or with the plenums provided on a same surface of the flow path member. 
   
   
       18 . The heat exchanger according to  claim 10 , wherein the grooves formed as the primary flow path or the secondary flow path are formed in a manner arranged adjacent to each other on the same metal plate.