Reverse steam generator for a lead-cooled fast reactor. The reverse steam generator comprises a cylindrical body with a bundle of heat exchange tubes located inside, the ends of the heat exchange tubes being fixed in tube sheets with intermediate support grids; inlet and outlet spherical chambers for supplying liquid metal coolant; a lower branch pipe for inlet water; and an upper branch pipe for a steam outlet. The cylindrical body is arranged horizontally and is curved in a Z-shape with a difference in height. The bundle of heat exchange tubes is also made in a Z-shape, repeating the bend of the cylindrical body.

Reverse steam generator for a lead-cooled fast reactor. The reverse steam generator comprises a cylindrical body with a bundle of heat exchange tubes located inside, the ends of the heat exchange tubes being fixed in tube sheets with intermediate support grids; inlet and outlet spherical chambers for supplying liquid metal coolant; a lower branch pipe for inlet water; and an upper branch pipe for a steam outlet. The cylindrical body is arranged horizontally and is curved in a Z-shape with a difference in height. The bundle of heat exchange tubes is also made in a Z-shape, repeating the bend of the cylindrical body.

The purpose of the present invention is to provide a furnace wall in which a throat section with a smaller channel diameter than other regions can be formed using all peripheral wall tubes. Provided is a furnace wall comprising: a plurality of peripheral wall tubes (142), which are disposed so as to form a cylindrical shape when aligned in one direction and through the interior of which cooling water flows; and fins (140) that connect neighboring peripheral wall tubes (142) in an airtight manner. In a throat section in which the diameter of a horizontal cross-section of the cylindrical shape is reduced in comparison to other regions, the peripheral wall tubes (142) are disposed so as to be in mutual contact and the fins (140) are disposed on the inner circumferential sides of the cylindrical shapes.

A modular heat recovery steam generator (mHRSG) comprises a first boiler module comprising a plurality of pipes having at least one pipe with a flanged end; a first piping deck comprising a plurality of pipes having at least one pipe with a flanged end, wherein the pipe with the flanged end is secured to the pipe with the flanged end of the first boiler module using bolts; a second boiler module comprising a plurality of pipes having at least one pipe with a flanged end; a second piping deck comprising a plurality of pipes having at least one pipe with a flanged end, wherein the pipe with the flanged end is secured to the pipe with the flanged end of the second boiler module using bolts; and a main stack. The first boiler module is operatively coupled to the second boiler module and the second boiler module is operatively coupled to the main stack.

A modular heat recovery steam generator (mHRSG) comprises a first boiler module comprising a plurality of pipes having at least one pipe with a flanged end; a first piping deck comprising a plurality of pipes having at least one pipe with a flanged end, wherein the pipe with the flanged end is secured to the pipe with the flanged end of the first boiler module using bolts; a second boiler module comprising a plurality of pipes having at least one pipe with a flanged end; a second piping deck comprising a plurality of pipes having at least one pipe with a flanged end, wherein the pipe with the flanged end is secured to the pipe with the flanged end of the second boiler module using bolts; and a main stack. The first boiler module is operatively coupled to the second boiler module and the second boiler module is operatively coupled to the main stack.

A method for producing a heat transfer tube for a steam generator comprises a step of providing a tube and then applying cold drawing to the tube by using a high-pressure lubricating oil of 40 MPa or more in pressure. After the step of applying cold drawing to the tube, a step of applying a solid solution heat treatment to the tube is conducted. After the step of applying a solid solution heat treatment to the tube, a step of straightening the tube by using a roll straightening machine is conducted. An offset amount of 5 mm or less is formed for at least successive three pairs of upper and lower straightening rolls of the roll straightening machine.

A method for producing a heat transfer tube for a steam generator comprises a step of providing a tube and then applying cold drawing to the tube by using a high-pressure lubricating oil of 40 MPa or more in pressure. After the step of applying cold drawing to the tube, a step of applying a solid solution heat treatment to the tube is conducted. After the step of applying a solid solution heat treatment to the tube, a step of straightening the tube by using a roll straightening machine is conducted. An offset amount of 5 mm or less is formed for at least successive three pairs of upper and lower straightening rolls of the roll straightening machine.

A heat exchanger includes a shell, and a tube assembly disposed in the shell, the tube assembly including at least one tube, wherein the tube has a pair of end sections having a first diameter and a central section extending between the end sections having a second diameter that is greater than the first diameter.

A package water tube boiler having a novel radiant tube design which includes one or more additional tubes situated within the combustion section of the boiler. The novel tube design may be used in both hot water and steam applications.

A package water tube boiler having a novel radiant tube design which includes one or more additional tubes situated within the combustion section of the boiler. The novel tube design may be used in both hot water and steam applications.