Patent ID: 8381803

Claim:
A high-temperature and high-pressure corrosion-resistant process heat exchanger ( 60 ) for a nuclear hydrogen production system, comprising: at least one second system coolant channel ( 63 a ), on one side of which a second system coolant inlet header ( 61 a ), into which a high-temperature second system coolant ( 70 ), heated by heat from the intermediate heat exchanger ( 50 ), is introduced, is provided, in an intermediate portion of which an effective heat transmission region ( 65 ), receiving heat from the high-temperature second system coolant ( 70 ), is formed, on the other side of which a second system coolant outlet header ( 61 b ), out of which a low-temperature second system coolant ( 71 ) is discharged, is provided, and which is defined by a quadrilateral corrugated heat transmission fin ( 65 a ), which is bent at a predetermined width and height and is disposed in a transverse direction, and by heat transmission plates, which are stacked on upper and lower sides of the heat transmission fin ( 65 b ); and at least one third system coolant channel ( 63 b ), which is located on the upper and/or lower side of the second system coolant channel ( 63 a ), on one side of which a third system coolant inlet header ( 62 a ), into which a low-temperature third system coolant ( 80 ) is introduced, is provided, in an intermediate portion of which an effective heat transmission region ( 65 ), transmitting heat to the low-temperature third system coolant ( 80 ), is formed, on the other side of which a third system coolant outlet header ( 62 b ), out of which a high-temperature third system coolant ( 81 ), heated by reaction with reaction catalysts ( 90 ) together with the heat from the effective heat transmission region ( 65 ), is discharged, is provided, which is defined by a quadrilateral corrugated heat transmission fin ( 65 a ), which is bent at a predetermined width and height and is disposed in a transverse direction, and by heat transmission plates stacked on upper and lower sides of the heat transmission fin ( 65 b ), and which includes the reaction catalysts ( 90 ) in grooves of the corrugated heat transmission fin ( 65 a ), wherein the heat transmission fins ( 65 a ) and the heat transmission plates ( 65 b ) of the second and third system coolant channels ( 63 a and 63 b ) are made of a super alloy; and in the third system coolant channel ( 63 b ), surfaces of the heat transmission fin ( 65 a ) and the heat transmission plate ( 65 b ), which come into contact with sulfuric acid (H 2 SO 4 ) and/or sulfite (SO 3 ), are subjected to ion-beam coating and ion-beam mixing using a material having high corrosion resistance.