Vapor generator

Claim 2

In a fluid heating unit, walls forming a furnace for flow of heating gases, means supplying high temperature heating gases to said furnace, one of said walls including a first group of upwardly extending fluid heating tubes forming a lower portion of said one wall and arranged for parallel flow of fluid therethrough, a second group of upwardly extending fluid heating tubes forming an upper portion of said one wall and arranged for parallel flow of fluid therethrough, means connecting the second group of tubes for series flow of fluid from the first group of tubes, means supplying fluid in parallel flow relation to the first group of tubes, said first and second groups of tubes being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, some of the tubes of the second group having lower portions interLaced with upper portions of some of the tubes of the first group, means for supporting said one wall including means rigidly uniting said interlaced tube portions of the first and second groups of tubes and transmitting the load of the first group of tubes to the second group of tubes, and means for top supporting the second group of tubes.

Claim 3

In a forced circulation fluid heating unit, upright walls forming a furnace for flow of heating gases, means supplying high temperature heating gases to the furnace, one of the walls including a first group of upwardly extending laterally spaced fluid heating tubes rigidly united by metallic webs disposed in the intertube spaces to form a lower portion of said one wall, a second group of upwardly extending laterally spaced fluid heating tubes rigidly united by metallic webs disposed in the intertube spaces to form an upper portion of said one wall and having their longitudinal axes aligned with the longitudinal axes of tubes of the first group, means supplying fluid to tubes of the first group, header means communicating with and receiving and mixing fluids flowing from tubes of the first group and distributing mixed fluids to tubes of the second group, the first and second groups of tubes being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, some of the tubes of the first and second tube groups being bent out of the plane of the wall at first and second levels, respectively, for connection to the header means and interlaced with and laterally spaced from each other in the plane of the wall between the first and second levels, the second level being subjacent the first level, each pair of axially aligned tubes of the first and second tube groups being bent out of the plane of the wall at positions contiguous to each other for connection to the header means to provide substantially continuous tubular surface exposed to the heating gases, and means for supporting said one wall including metallic webs disposed in the spaces between and weld united to the interlaced tube portions of the first and second groups of tubes and transmitting the load of the first group of tubes to the second group of tubes, and means for top-supporting the second group of tubes.

Claim 4

In a forced circulation fluid heating unit, upright walls forming a furnace for flow of heating gases, means supplying high temperature heating gases to the furnace, one of the walls including a first group of upwardly extending laterally spaced fluid heating tubes rigidly united by metallic webs disposed in the intertube spaces to form a lower portion of said one wall, a second group of upwardly extending laterally spaced fluid heating tubes rigidly united by metallic webs disposed in the intertube spaces to form an upper portion of said one wall and having their longitudinal axes aligned with the longitudinal axes of tubes of the first group, means supplying fluid to tubes of the first group, header means communicating with and receiving and mixing fluids flowing from tubes of the first group and distributing mixed fluids to tubes of the second group, the first and second groups of tubes being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, some of the tubes of the first and second tube groups being bent out of the plane of the wall at first and second levels, respectively, for connection to the header means and interlaced with and laterally spaced from each other in the plane of the wall between the first and second levels, the second level being subjacent the first level, each pair of axially aligned tubes of the first and second tube groups being bent out of the plane of the wall at positions contiguous to each other for connection to the header means to provide substantially continuous tubular surface exposed to the heating gases, and means for supporting said one wall including metallic webs disposed in the spaces between and weld united to the interlaced tube portions of the first and second groups of tubes and transmitting the load of the first group of tubes to the second group of tubes, and means for top-supporting the second group of tubes.

Claim 5

In a forced circulation fluid heating unit, upright walls forming a furnace flow of heating gases, means supplying high temperature heating gases to said furnace, one of said walls including a first group of upwardly extending laterally spaced fluid heating tubes rigidly united by metallic webs disposed in the intertube spaces to form a lower portion of said one wall, a second group of upwardly extending laterally spaced fluid heating tubes arranged for parallel flow of fluid therethrough and rigidly united by metallic webs disposed in the intertube spaces to form an upper portion of said one wall and having their longitudinal axes aligned with the longitudinal axes of tubes of the first group, header means communicating with and receiving and mixing fluids flowing from tubes of the first group and distributing mixed fluids to tubes of the second group, means supplying fluid to tubes of the first group, said first and second groups of tubes being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, some of the tubes of the first and second tube groups being bent out of the plane of the wall at first and second levels, respectively, for connection to the header means and interlaced with and laterally spaced from each other in the plane of the wall between the first and second levels, the second level being subjacent the first level, and means for supporting said one wall including metallic webs disposed in the spaces between and weld united to the interlaced tube portions of the first and second groups of tubes and transmitting the load of the first group of tubes to the second group of tubes, and means for top-supporting the second group of tubes.

Claim 6

In a forced circulation fluid heating unit, upright walls forming a furnace flow of heating gases, means supplying high temperature heating gases to said furnace, one of said walls including a first group of upwardly extending laterally spaced fluid heating tubes rigidly united by metallic webs disposed in the intertube spaces to form a lower portion of said one wall, a second group of upwardly extending laterally spaced fluid heating tubes arranged for parallel flow of fluid therethrough and rigidly united by metallic webs disposed in the intertube spaces to form an upper portion of said one wall and having their longitudinal axes aligned with the longitudinal axes of tubes of the first group, header means communicating with and receiving and mixing fluids flowing from tubes of the first group and distributing mixed fluids to tubes of the second group, means supplying fluid to tubes of the first group, said first and second groups of tubes being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, some of the tubes of the first and second tube groups being bent out of the plane of the wall at first and second levels, respectively, for connection to the header means and interlaced with and laterally spaced from each other in the plane of the wall between the first and second levels, the second level being subjacent the first level, and means for supporting said one wall including metallic webs disposed in the spaces between and weld united to the interlaced tube portions of the first and second groups of tubes and transmitting the load of the first group of tubes to the second group of tubes, and means for top-supporting the second group of tubes.

Claim 7

In a fluid heating unit, upright walls forming a furnace for flow of heating gases, means supplying high temperature heating gases to the furnace, one of said walls including a first group of upwardly extending laterally spaced fluid heating tubes forming first and second fluid heating passes and rigidly united by metallic webs disposed in the intertube spaces to form a lower portion of said one wall, the tubes of the second fluid heating pass being interlaced with the tubes of the first fluid heating pass, a second group of upwardly extending laterally spaced fluid heating tubes forming a third fluid heating pass and rigidly united by metallic webs disposed in the intertube spaces to form an upper portion of said one wall and having their longitudinal axes aligned with the longitudinal axes of tubes of the first group, means including header means interconnecting said fluid heating passes to provide serial flow of fluid successively through tubes of the first fluid heating pass, tubes of the second fluid heating pass, and tubes of the third fluid heating pass, the tubes of each fluid heating pass being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, some of the tubes of the first and second tube groups being bent out of the plane of the wall at first and second levels, respectively, for connection to the header means and interlaced with and laterally spaced from each other in the plane of the wall between the first and second levels, the second level being subjacent the first level, each pair of axially aligned tubes of the first and second tube groups being bent out of the plane of the wall at positions contiguous to each other for connection to the header means to provide substantially continuous tubular surface exposed to the heating gases, means for supporting said one wall including metallic webs disposed in the spaces between and weld united to the interlaced tube portions of the first and second group of tubes and transmitting the load of the first group of tubes to the second group of tubes, and means for top supporting the second group of tubes.

Claim 8

In a fluid heating unit, upright walls forming a furnace for flow of heating gases, means supplying high temperature heating gases to the furnace, one of said walls including a first group of upwardly extending laterally spaced fluid heating tubes forming first and second fluid heating passes and rigidly united by metallic webs disposed in the intertube spaces to form a lower portion of said one wall, the tubes of the second fluid heating pass being interlaced with the tubes of the first fluid heating pass, a second group of upwardly extending laterally spaced fluid heating tubes forming a third fluid heating pass and rigidly united by metallic webs disposed in the intertube spaces to form an upper portion of said one wall and having their longitudinal axes aligned with the longitudinal axes of tubes of the first group, means including header means interconnecting said fluid heating passes to provide serial flow of fluid successively through tubes of the first fluid heating pass, tubes of the second fluid heating pass, and tubes of the third fluid heating pass, the tubes of each fluid heating pass being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, some of the tubes of the first and second tube groups being bent out of the plane of the wall at first and second levels, respectively, for connection to the header means and interlaced with and laterally spaced from each other in the plane of the wall between the first and second levels, the second level being subjacent the first level, each pair of axially aligned tubes of the first and second tube groups being bent out of the plane of the wall at positions contiguous to each other for connection to the header means to provide substantially continuous tubular surface exposed to the heating gases, means for supporting said one wall including metallic webs disposed in the spaces between and weld united to the interlaced tube portions of the first and second group of tubes and transmitting the load of the first group of tubes to the second group of tubes, and means for top supporting the second group of tubes.

Claim 9

In a forced circulation fluid heating unit, upright walls forming a furnace for flow of heating gases, means supplying high temperature heating gases to the furnace, the walls including first and second fluid heating passes each comprising a multiplicity of upflow tubes arranged in spaced relation and for parallel flow of fluid therethrough, all heated tubes of the upright furnace walls being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, means supplying a vaporizable fluid to tubes of the first fluid heating pass, means interconnecting the fluid heating passes to provide serial upflow of fluid successively through tubes of the first fluid heating pass and tubes of the second fluid heating pass, and means rigidly uniting the passes and the tubes thereof to each other to provide a substantially gas-tight furnace wall construction.

Claim 10

In a forced circulation fluid heating unit, upright walls forming a furnace for flow of heating gases, means supplying high temperature heating gases to the furnace, the walls including first and second fluid heating passes each comprising a multiplicity of upflow tubes arranged in spaced relation and for parallel flow of fluid therethrough, all heated tubes of the upright furnace walls being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, means supplying a vaporizable fluid to tubes of the first fluid heating pass, means interconnecting the fluid heating passes to provide serial upflow of fluid successively through tubes of the first fluid heating pass and tubes of the second fluid heating pass, and means rigidly uniting the passes and the tubes thereof to each other to provide a substantially gas-tight furnace wall construction.

Claim 11

In a forced circulation fluid heating unit, upright walls forming a furnace for a flow of heating gases, means supplying high temperature heating gases to the furnace, the walls including coextensive first and second fluid heating passes of substantially the same length each comprising a multiplicity of upflow tubes arranged in spaced relation and for parallel flow of fluid therethrough, all heated tubes of the upright furnace walls being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, means supplying a vaporizable fluid to tubes of the first fluid heating pass, means interconnecting the fluid heating passes to provide serial upflow of fluid successively through tubes of the first fluid heating pass and tubes of the second fluid heating pass, and means rigidly uniting the passes and the tubes thereof to each other along substantially their entire lengths to provide a substantially gas-tight furnace wall construction.

Claim 12

In a forced circulation fluid heating unit, upright walls forming a furnace for a flow of heating gases, means supplying high temperature heating gases to the furnace, the walls including coextensive first and second fluid heating passes of substantially the same length each comprising a multiplicity of upflow tubes arranged in spaced relation and for parallel flow of fluid therethrough, all heated tubes of the upright furnace walls being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, means supplying a vaporizable fluid to tubes of the first fluid heating pass, means interconnecting the fluid heating passes to provide serial upflow of fluid successively through tubes of the first fluid heating pass and tubes of the second fluid heating pass, and means rigidly uniting the passes and the tubes thereof to each other along substantially their entire lengths to provide a substantially gas-tight furnace wall construction.

Claim 13

In a forced circulation fluid heating unit, upright walls forming a furnaCe for flow of heating gases, means supplying high temperature heating gases to said furnace, one of said walls including a first fluid heating pass comprising a multiplicity of upflow tubes arranged in spaced relation and for parallel flow of fluid therethrough, a second fluid heating pass of substantially the same length as the first fluid heating pass comprising a multiplicity of upflow tubes arranged for parallel flow of fluid therethrough and interlaced and coextensive with the upflow tubes of the first fluid heating pass, said first and second fluid heating passes being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, means for passing a vaporizable fluid to the tubes of the first fluid heating pass, means interconnecting said fluid heating passes to provide serial upflow of fluid successively through the tubes of the first fluid heating pass and the tubes of the second fluid heating pass, and metallic web means rigidly uniting the tubes of the first and second fluid heating passes along substantially their entire lengths.

Claim 14

In a forced circulation fluid heating unit, upright walls forming a furnaCe for flow of heating gases, means supplying high temperature heating gases to said furnace, one of said walls including a first fluid heating pass comprising a multiplicity of upflow tubes arranged in spaced relation and for parallel flow of fluid therethrough, a second fluid heating pass of substantially the same length as the first fluid heating pass comprising a multiplicity of upflow tubes arranged for parallel flow of fluid therethrough and interlaced and coextensive with the upflow tubes of the first fluid heating pass, said first and second fluid heating passes being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, means for passing a vaporizable fluid to the tubes of the first fluid heating pass, means interconnecting said fluid heating passes to provide serial upflow of fluid successively through the tubes of the first fluid heating pass and the tubes of the second fluid heating pass, and metallic web means rigidly uniting the tubes of the first and second fluid heating passes along substantially their entire lengths.

Claim 15

In a forced circulation fluid heating unit, upright walls forming a furnace for flow of heating gases, means supplying high temperature heating gases to said furnace, said walls including a first fluid heating pass comprising a multiplicity of upflow tubes arranged in spaced relation and for parallel flow of fluid therethrough, a second fluid heating pass comprising a multiplicity of upflow tubes arranged for parallel flow of fluid therethrough and interlaced with and of substantially the same length as the upflow tubes of the first fluid heating pass, said first and second fluid heating passes being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, means for passing a vaporizable fluid to the tubes of the first fluid heating pass, means interconnecting said fluid heating passes to provide serial upflow of fluid successively through the tubes of the first fluid heating pass and the tubes of the second fluid heating pass, and metallic web means rigidly uniting the tubes of the first and second fluid heating passes along substantially their entire lengths.

Claim 16

In a forced circulation fluid heating unit, upright walls forming a furnace for flow of heating gases, means supplying high temperature heating gases to said furnace, said walls including a first fluid heating pass comprising a multiplicity of upflow tubes arranged in spaced relation and for parallel flow of fluid therethrough, a second fluid heating pass comprising a multiplicity of upflow tubes arranged for parallel flow of fluid therethrough and interlaced with and of substantially the same length as the upflow tubes of the first fluid heating pass, said first and second fluid heating passes being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, means for passing a vaporizable fluid to the tubes of the first fluid heating pass, means interconnecting said fluid heating passes to provide serial upflow of fluid successively through the tubes of the first fluid heating pass and the tubes of the second fluid heating pass, and metallic web means rigidly uniting the tubes of the first and second fluid heating passes along substantially their entire lengths.

Claim 17

In a fluid heating unit, walls forming a furnace for flow of heating gases, means supplying high temperature heating gases to said furnace, one of said walls including a first group of upwardly extending rigidly united fluid heating tubes arranged in spaced relation to form a lower portion of said one wall and arranged for parallel flow of fluid therethrough, a second group of upwardly extending rigidly united fluid heating tubes arranged in spaced relation to form an upper portion of said one wall and arranged for parallel flow of fluid therethrough, means connecting the second group of tubes for series flow of fluid from the first group of tubes, means supplying fluid in parallel flow relation to the first group of tubes, said first and second groups of tubes being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, some of the tubes of the second group having lower portions interlaced with upper portions of some of the tubes of the first group, means for supporting said one wall including web means rigidly uniting said interlaced tube portions of the first and second groups of tubes and transmitting the load of the first group of tubes to the second group of tubes, and means for top supporting the second group of tubes.

Claim 18

In a fluid heating unit, walls forming a furnace for flow of heating gases, means supplying high temperature heating gases to said furnace, one of said walls including a first group of upwardly extending rigidly united fluid heating tubes arranged in spaced relation to form a lower portion of said one wall and arranged for parallel flow of fluid therethrough, a second group of upwardly extending rigidly united fluid heating tubes arranged in spaced relation to form an upper portion of said one wall and arranged for parallel flow of fluid therethrough, means connecting the second group of tubes for series flow of fluid from the first group of tubes, means supplying fluid in parallel flow relation to the first group of tubes, said first and second groups of tubes being constructed and arranged to provide flow of fluid in the furnace only in an upward direction, some of the tubes of the second group having lower portions interlaced with upper portions of some of the tubes of the first group, means for supporting said one wall including web means rigidly uniting said interlaced tube portions of the first and second groups of tubes and transmitting the load of the first group of tubes to the second group of tubes, and means for top supporting the second group of tubes.