INLET ARRANGEMENT FOR COLLECTION OF CARRY OVER FOR A VERTICAL REGENERATOR OF AN END-PORT FURNACE

Abstract

The invention relates to a regenerator assembly and an inlet arrangement for collection of carry over (10) for a vertical regenerator (80) of an end-port furnace (90) comprising: an inlet wall comprising an opening for a port for gas exchange, e.g. towards or from an end-port furnace; a target wall being arranged such, that most of the via the inlet wall incoming hot gas is initially deflected at the target wall; a barrier wall comprising a recess for gas exchange, e.g. from or towards a pass of the regenerator, a (at least one) delimiting wall or walls, such as a floor and/or a roof and/or a sidewall; the inlet wall, the target wall, the barrier wall and the delimiting wall or walls define the inlet arrangement for collection of carry over such that a gas flow entering the inlet arrangement for collection of carry over via the port will exit the inlet arrangement for collection of carry over via the recess or vice versa; and the ratio between the area of the barrier wall and the total area in the plane of the barrier wall, limited by the delimiting wall or walls, such as the floor, the roof, the inlet wall and the target wall, is in the range of 20% to 40%.

Claims

1. Inlet arrangement for collection of carry over (10) for a vertical regenerator (80) of an end-port furnace (90) comprising: an inlet wall (20) comprising an opening for a port (21, 21) for gas exchange towards an end-port furnace (90); a target wall (60) being arranged such that most of the hot gas incoming via the inlet wall (20) is initially deflected at the target wall (60); a barrier wall (70) comprising a recess (71) for gas exchange towards a pass (82) of the regenerator (80); a delimiting wall or delimiting walls (30, 40, 50), such as a floor (30) and/or a roof (40) and/or a sidewall (50); the inlet wall (20), the target wall (60), the barrier wall (70) and the delimiting wall or walls (30, 40, 50) define the inlet arrangement for collection of carry over (10) such that a gas flow entering the inlet arrangement for collection of carry over (10) via the opening for a port (21, 21) will exit the inlet arrangement for collection of carry over (10) via the recess (71) or vice versa; characterized in that, the ratio between the area of the barrier wall (70) and the total area in the plane (73) of the barrier wall (70), limited by the delimiting wall or walls (30, 40, 50), such as the floor (30), the roof (40), the inlet wall (20) and the target wall (60), is in the range of 20% to 40%.

2. Inlet arrangement for collection of carry over (10) according to claim 1, characterized in that the target wall (60) is arranged opposite of the inlet wall(20), and the barrier wall (70) is arranged at an angle between 80 to 100 relative to the target wall (60).

3. Inlet arrangement for collection of carry over (10) according to claim 1, characterized in that the target wall (60) comprises at least one hole for cleaning (61).

4. Inlet arrangement for collection of carry over (10) according to claim 3, characterized in that each hole for cleaning has a square or rectangular cross-section with a side length in the range of 250 to 700 mm, preferably 500 mm to 700 mm.

5. Inlet arrangement for collection of carry over (10) according to claim 1, characterized in that the target wall (60) and the barrier wall (70) being connected along one corner of the inlet arrangement for collection of carry over (10).

6. Inlet arrangement for collection of carry over (10) according to claim 1, characterized in that the target wall (60) and the barrier wall (70) being connected along the full height (10d) in one corner of the inlet arrangement for collection of carry over (10).

7. Inlet arrangement for collection of carry over (10) according to claim 1, characterized in that the barrier wall (70) defines a triangular barrier (72).

8. Inlet arrangement for collection of carry over (10) according to claim 7, characterized in that the delimiting wall or walls (30, 40, 50) comprises a floor (30), the triangular barrier (72) is of the form of a right-angled triangle, with one leg aligned on the floor(30) and the second leg aligned on the target wall (60).

9. Inlet arrangement for collection of carry over (10) according to claim 1, characterized in that the further delimiting walls (30, 40, 50) comprises a floor (30), the floor (30) of the inlet arrangement for collection of carry over (10) being at a lower elevation than a bottom edge (22) of the opening for the port (21, 21) such that a step (23) is introduced between the floor (30) of the inlet arrangement for collection of carry over (10) and the bottom edge (22) of the opening for the port.

10. Inlet arrangement for collection of carry over (10) according to claim 9, characterized in that the step (23) has a step height in the range 50 cm to 90 cm.

11. Inlet arrangement for collection of carry over (10) according to claim 1, characterized in that all walls of the inlet arrangement for collection of carry over (10) are planar, vertical walls.

12. Regenerator assembly comprising an inlet arrangement for collection of carry over (10) according to claim 1, characterized in that the further delimiting walls (30, 40, 50) of the inlet arrangement for collection of carry over (10) comprises a floor (30), the floor (30) of the inlet arrangement for collection of carry over (10) is arranged on top of a first pass (81) of a regenerator (80) and is built on a support (31) connected to the housing of the regenerator (80).

13. Regenerator assembly according to claim 12, characterized in that the support (31) are ceramic tubes (32) or a sub crown structure (33).

14. Regenerator assembly according to claim 12, characterized in that the inlet arrangement for collection of carry over (10) is arranged on top of the first pass (81) of the regenerator (80) and inside the housing of the regenerator (80) such that gas entering the inlet arrangement for collection of carry over (10) via the opening for the port (21, 21) is guided through the inlet arrangement for collection of carry over (10) and exits the inlet arrangement for collection of carry over (10) at the recess (71) of the barrier wall (70) of the inlet arrangement for collection of carry over (10) and through the second pass (82) of the regenerator (80) and further through the first pass (81) of the regenerator (80) and exits the regenerator (80) through the canal (85).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Exemplary embodiments are shown in the drawings:

[0065] FIG. 1a is a perspective view of a double pass vertical regenerator with an inlet arrangement for collection of carry over.

[0066] FIG. 1b is a perspective view of a single pass vertical regenerator with an inlet arrangement for collection of carry over.

[0067] FIG. 1c is a perspective view of a wire frame model of an inlet arrangement for collection of carry over.

[0068] FIG. 2 are side views of an inlet arrangement for collection of carry over in a regenerator showing different support means.

[0069] FIG. 3 shows side views of schematic dimensions of different embodiments of an inlet arrangement for collection of carry over.

[0070] FIG. 4 shows a schematic example of a checker geometry.

DETAILED DESCRIPTION

[0071] FIG. 1a shows one embodiment of a double pass vertical regenerator (80) for heat exchange with an end port furnace (90) comprising an inlet arrangement for collection of carry over (10). The end port furnace (90) is connected to a regenerator chamber (80b) of the double pass vertical regenerator (80) via the port (21), such that gases can be exchanged between the end port furnace (90) and the regenerator (80). The end port furnace can be connected via a second port (21) to a second regenerator chamber (80, only partly shown) which has a mirrored design to the shown regenerator chamber (80). In the heat cycle, hot flue gases from the end port furnace (90) enter the regenerator (80) via the opening (21a) for the port (21, 21) of the inlet wall (20) into the inlet arrangement for collection of carry over (10). The inlet arrangement for collection of carry over (10) is positioned on the top of the regenerator (80) on top of a first pass (short pass) (81) of the regenerator (80). The inlet arrangement for collection of carry over (10) is a chamber (geometrically similar to a room) defined by several walls (20, 30, 40, 50, 60, 70), with two openings (21a, 71), namely an opening (21a) for a port (21, 21) for gas exchange to an end-port furnace (90) and a recess (71) for gas exchange to the second pass (long pass) (82) of the regenerator (80). The opening to the end-port furnace (90) (called opening (21a) for the port (21, 21)) is situated in the inlet wall (20) of the inlet arrangement for collection of carry over (10). The opening to the second pass (82) of the regenerator (10) is the recess (71) in the barrier wall (70) of the inlet arrangement for collection of carry over (10). The bottom of the inlet arrangement for collection of carry over (10) is built by the floor (30). The top of the inlet arrangement for collection of carry over (10) is built by the roof (40). The roof (40) can be built by the roof of the housing of the regenerator (80). The inlet arrangement for collection of carry over (10) further comprises a sidewall (50), which can be part of the main division wall (center wall) delimiting two regenerator chambers (80, 80). A target wall (60) can be opposite the inlet wall (20). A barrier wall (70) is positioned such, that it is aligned about 90 to the target wall (60). In this example the roof is an arched roof and all other walls are aligned to each other in a regular rectangular form, or in other words, all walls are arranged at an angle of 90 to each neighboring wall. In that case the inside of the inlet arrangement for collection of carry over (10) resembles a cuboid with an arched roof.

[0072] During the heat cycle the hot flue gas enters the inlet arrangement for collection of carry over (10) via the opening (21a) for the port (21, 21) of the inlet wall (20) in the direction towards the target wall (60). The gas is deflected by and from the target wall and changes flow direction towards the recess (71) of the barrier wall (70) and finally leaves the inlet arrangement for collection of carry over (10) via the recess (71) and continues to flow through the second pass (82) of the regenerator (80) via a connection canal (86) (also called flue) formed by openings built by rider arches (87) and an opening (e.g. in the form of an arch) in the division wall (84) situated near the bottom of the regenerator (80) further to the first pass (81) of the regenerator (80). Both passes (81, 82) are filled with checkers/checkerwork bricks (83), which are refractory bricks, e.g. made of magnesia (magnesium oxide), MZS (magnesia zirconium silicate), mullite or AZS (alumina-zirconia-silica) fused cast material, zirconia mullite or chrome-alumina. The checkers (83) rest on top of the rider arches (87) which are situated at the bottom (the floor) of the regenerator (80). The passes (81, 82) are separated by a division wall (84), which comprises an opening in the form of an arch at the bottom of the regenerator (80), for gas exchange between the passes (81, 82). The hot flue gas transfers most of its thermal energy to the checkers (83) where the heat is stored (e.g. the checkers get hot). The flue gas exits the regenerator (80) via the canal (85).

[0073] When the hot flue gas changes its direction of flow from the incoming direction defined by the opening (21a) for the port (21, 21) to the outgoing direction defined by the recess (71) particles and dust are separated from the gas stream. These particles hit the target wall (60) and some particles are absorbed and/or retained by this target wall (60), most particles loose most of their kinetic energy and fall down to the floor (30) of the inlet arrangement for collection of carry over (10), where they accumulate. The hot flue gas shows a greatly reduced amount of particles or dust upon exiting the inlet arrangement for collection of carry over (10) via the recess (71).

[0074] During the reverse cycle cold gas (e.g. external fresh air) enters the regenerator (80) via the canal (85) and flows through the first pass (81) via the connection canal (86) in the division wall (84) into the second pass (82) from where it enters the inlet arrangement for collection of carry over (10) via the recess (71) of the barrier wall (70). The hot checkers (83) of the regenerator passes (81, 82) heat up the incoming gas. The heated gas entering the recess (71) changes direction of flow towards the opening (21a) for the port (21, 21) of the inlet wall (20) where it exits the inlet arrangement for collection of carry over (10) and the regenerator (80) towards an end-port furnace (90).

[0075] To further reduce the amount of particles to be transported back to the end-port furnace (90) a step (23) is introduced between the floor (30) of the inlet arrangement for collection of carry over (10) and the bottom edge (22) of the opening for the port (21, 21).

[0076] For cleaning/removing dust and particle (carry over) accumulated on the floor (30) of the inlet arrangement for collection of carry over (10) holes for cleaning (61) are built into the target wall (60), which can be opened for cleaning and closed (by fixing plugs into the holes using mortar) for operation of the inlet arrangement for collection of carry over (10).

[0077] In FIG. 1a the cutting plane for section A-A is shown.

[0078] FIG. 1b shows one embodiment of a single pass vertical regenerator (80) for heat exchange with an end port furnace (90) comprising an inlet arrangement for collection of carry over (10). In a single pass vertical regenerator (80) only one pass (82) is present. The inlet arrangement for collection of carry over (10) is situated adjacent to the sidewall of the regenerator (80) or in other words that the barrier wall (70) of the inlet arrangement for collection of carry over (10) is built by a sidewall of the regenerator (80) housing. The recess (71) of the barrier wall is thus also a recess of the sidewall of the regenerator (70) housing. As shown in FIG. 1b the inlet arrangement for collection of carry over (10) is positioned at the top section of the regenerator (80). The same gas flow is achieved as in the embodiment for a double pass vertical regenerator (80) except that gas will exit the regenerator (80) after having passed through the only pass (82) through the canal (85) during the heat cycle.

[0079] FIG. 1c shows a wire frame model of one embodiment of an inlet arrangement for collection of carry over (10) with an inlet wall (20) with an opening (21a) for a port (21), a floor (30), a target wall (60) opposite of the inlet wall (20) with three cleaning holes (61), a barrier wall (70), the target wall (60) is arranged opposite of the inlet wall (20), and the barrier wall (70) is arranged at an angle of 90 relative to the target wall (60), the target wall (60) and the barrier wall (70) being connected along the full height (10d) in one corner of the inlet arrangement for collection of carry over (10), the barrier wall (70) defining a triangular barrier (72), the triangular barrier (72) is of the form of a right-angled triangle, with one leg aligned on the floor (30) and perpendicular to the target wall (70) and the second leg aligned on (along) the target wall (60) and perpendicular to the floor (30), the target wall (60) comprises three holes for cleaning (61), each hole for cleaning (61) has a rectangular cross-section with a side length in the range of 500 to 600 mm, the ratio R between the area A(wall) of the barrier wall (70) and the total area A(total) in the plane (73) of the barrier wall (70) limited by the inlet wall (20), the floor (30), the roof (40) and the target wall (60) is R=37.5%.

[0080] FIG. 2 shows a schematic section view (section A-A, compare FIG. 1) of an inlet arrangement for collection of carry over (10) in a regenerator (80) with the barrier wall (70), building a barrier (72) and a recess (71) for gas exchange. The floor (30) of the inlet arrangement for collection of carry over (10) rests on a support (31) which is connected to the housing of the regenerator (80). The support (31) can be ceramic tubes (32) as shown in FIG. 2a or a sub crown structure (33) as shown in FIG. 2b.

[0081] For the construction with ceramic tubes (32) SiC tubes (e.g. Hexoloy SE Silicon Carbide from Saint Gobain) can be used. These tubes exhibit excellent hot properties and can have exemplary dimensions of 4600 mm length and 19 mm diameter. The division wall (84) and the side wall (50) act as carrier for these tubes (32), which can be installed side by side in a distance of e.g. 100 mm to each other. In order to build the floor (30) this arrangement of ceramic tubes (32) can be covered with ceramic plates (e.g. out of SiC, Mullite, Zirconiamullite).

[0082] In one embodiment of the invention the inlet arrangement for collection of carry over (10) comprises a barrier wall (70) that forms a right angled triangular barrier (72) for the gas exchange, where one leg of the triangular barrier (72) is aligned with the target wall (60) and perpendicular to the floor (30), thereby forming the corner between the barrier wall (70) and the target wall (60) and the second leg is aligned with the floor (30) of the inlet arrangement for collection of carry over (10) and perpendicular to the target wall (70).

[0083] FIG. 3 shows possible different versions of this embodiment, where exemplary the floor (30) of the inlet arrangement for collection of carry over (10) is built by a support (31) being ceramic tubes (32), according to the embodiment shown in FIG. 2a. Alternatively, for all examples of FIG. 3, the support (31) can be a sub crown structure (33) according to FIG. 2b. The triangular barrier (72) has a height (length a) and a base (length b).

[0084] FIG. 3a and FIG. 3b shows that the height (length a) of the barrier (72) can be the same as the height (10d) of the inlet arrangement for collection of carry over (10) in the corner between the barrier wall (70) and the target wall (60) or in other words the target wall (60) and the barrier wall (70) are connected along the full height (10d) in one corner of the inlet arrangement for collection of carry over (10).

[0085] FIG. 3c and FIG. 3d shows that the height (length a) of the barrier (72) can be smaller than the height (10d) of the inlet arrangement for collection of carry over (10) in the corner between the barrier wall (70) and the target wall (60).

[0086] FIG. 3a and FIG. 3c shows that the base (length b) of the barrier (72) can be the same as the dimension of the inlet arrangement for collection of carry over (10) along the intersection of the floor (30) with the barrier wall (70).

[0087] FIG. 3b and FIG. 3d shows a smaller base (length b) of the barrier (72) than the dimension of the inlet arrangement for collection of carry over (10) along the intersection of the floor (30) with the barrier wall (70), for example the base can be in the range of 70% to 80% of the dimension of the inlet arrangement for collection of carry over (10) along the intersecting line of the barrier wall (70) with the floor (30).

[0088] The best results were achieved using a right angled barrier (72) as shown in FIG. 3b, having the same height (length a) as the height (10d) of the inlet arrangement for collection of carry over (10) in the corner between the barrier wall (70) and the target wall (60) and having a base (length b) in around (e.g. 73 to 77%) of the dimension of the inlet arrangement for collection of carry over along the intersecting line of the barrier wall (70) with the floor (30). In this embodiment most particles/dust was kept away from the checker (83) and the best thermal efficiency was reached, probably due to a favorable distribution of the gas stream.

[0089] The dimensions of the regenerator (80) in this embodiment are as follows: 12 m height (80a), 13.6 m width (80b) with two chambers of 6.8 m width (80b and 80b; each chamber accounting for two passes with the same horizontal cross-section, each with a width of 3.4 m), 4.6 m depth (80c), each chamber having 2 passes (81, 82), with a connection canal (86) (sometimes called a flue; 6.8 m long, 1.5 m height, 4.6 m depth) which connects both passes (81, 82) at the bottom. The connection canal (86) joints the first pass (81) of each regenerator chamber (80, 80) of the regenerator (80) and the second pass (82) of each regenerator chamber (80, 80) of the regenerator (80) through a space underneath the rider arches (87), having the same horizontal cross section area (or in other words the ground area) as each regenerator chamber (80, 80) of the regenerator (80) and having 1.5 meter height.

[0090] The refractory checkerwork layout in this example is as follows:

[0091] For the second pass (82): 45 rows (layers) of checkers (83) of standard chimney block format (checker brick made out of MgO, RHI brand Anker DG1), on top: two layers of zirconia mullite bricks, RHI brand DURITAL AZ58.

[0092] For the short pass (81): 34 layers of checkers (83) of standard chimney block (AZS bricks, RHI brand Rubinal EZ).

[0093] Each checker (83) with the standard chimney block geometry has 140 mm flue size (83a) (this is the inner dimension of the checkers (83)), 175 mm height (83b), 38 mm wall thickness (83c). A schematic example of such a checker (83) is shown in FIG. 4. Generally, the checker has (in its use position in a vertical regenerator (80)) a so called flue channel (83d) allowing a hot gas to flow inside the checker (83) in a vertical direction.

[0094] The dimension of the inlet arrangement for collection of carry over (10) in this embodiment are as follows: 2.1 m height (10a), 3.4 m width (10b), 4.6 m depth (10c) (floor dimensions are the same as for one pass (81) of each regenerator chamber (80, 80) of the regenerator (80)), and 1.5 m height (10d) in the corner between the barrier wall (70) and the target wall (60) and with a barrier wall (70) defining a barrier (72) of 3.5 m base (length b; 76% of 4.6 m depth 10c)) and 1.5 m height (length a) in the corner between the barrier wall (70) and the target wall (60) thus defining an area A(barrier)=2.6 m.sup.2, A(recess)=6.2 m.sup.2 and A(total)=8.8 m.sup.2; thus a ratio of A(barrier)/A(total)=29.5% The inlet wall (20), the floor (30), the roof (40), the sidewall (50), the target wall (60) and the barrier wall (70) are all composed of bricks of mullite (RHI brand Durital S70) and define a arched cuboid of volume 30 m.sup.3 (volume of cuboid plus arched space).

[0095] One specific embodiment is an inlet arrangement for collection of carry over (10) for a vertical regenerator (80) of an end-port furnace (90) comprising: [0096] an inlet wall (20) comprising an opening fora port (21, 21) for gas exchange towards an end-port furnace (90), [0097] a floor (30), [0098] a target wall (60) being arranged such, that most of the via the inlet wall(20) incoming hot gas is initially deflected at the target wall (60), [0099] a barrier wall (70) comprising a recess (71) for gas exchange towards a pass (82) of the regenerator (80), [0100] a roof (40), [0101] a sidewall (50), [0102] the inlet wall (20), the floor (30), the roof (40), the sidewall (50), the target wall (60), the barrier wall (70) defining the inlet arrangement for collection of carry over (10) such that a gas flow entering the inlet arrangement for collection of carry over (10) via the opening for a port (21, 21) will exit the inlet arrangement for collection of carry over (10) via the recess (71) or vice versa
wherein the target wall (60) is arranged opposite of the inlet wall(20), and the barrier wall (70) is arranged at an angle between 80 to 100 relative to the target wall (60),
and the target wall (60) comprises at least one hole for cleaning (61),
and each hole for cleaning has a square or rectangular cross-section with a side length in the range of 250 to 700 mm, preferably 500 mm to 700 mm,
and the target wall (60) and the barrier wall (70) being connected along one corner of the inlet arrangement for collection of carry over (10),
and the target wall (60) and the barrier wall (70) being connected along the full height (10d) in one corner of the inlet arrangement for collection of carry over (10), and the ratio between the area of the barrier wall (70) and the total area in the plane (73) of the barrier wall (70) limited by the inlet wall (20), the floor (30), the roof (40) and the target wall (60) is in the range of 20% to 40%, preferably in the range of 30% to 38%, and the barrier wall (70) defines a triangular barrier (72), and the triangular barrier (72) is of the form of a right-angled triangle, with one leg aligned on the floor(30) and the second leg aligned on the target wall (60), and the floor (30) of the inlet arrangement for collection of carry over (10) being at a lower elevation than the bottom edge (22) of the opening for the port (21, 21) such that a step (23) is introduced between the floor (30) of the inlet arrangement for collection of carry over (10) and the bottom edge (22) of the opening for the port,
and the step (23) has a step height in the range 50 cm to 90 cm, more preferably in the range of 70 cm to 90 cm,
and all walls of the inlet arrangement for collection of carry over (10) are planar, vertical walls,
and the floor (30) of the inlet arrangement for collection of carry over (10) is arranged on top of first pass (81) of the regenerator (80) and is built on a support (31) connected to the housing of the regenerator (80).

[0103] Another embodiment is a Regenerator assembly comprising an inlet arrangement for collection of carry over (10), preferably according to the specific embodiment above, and a double pass vertical regenerator (80),

wherein the floor (30) of the inlet arrangement for collection of carry over (10) is arranged on top of first pass (81) of the regenerator (80) and is built on a support (31) connected to the housing of the regenerator (80),
and the support (31) are ceramic tubes (32) or a sub crown structure (33), and the inlet arrangement for collection of carry over (10) is arranged on top of the first pass (81) of the regenerator (80) and inside the housing of the regenerator (80) such that gas entering the inlet arrangement for collection of carry over (10) via the opening for the port (21, 21) is guided through the inlet arrangement for collection of carry over (10) and exits the inlet arrangement for collection of carry over (10) at the recess (71) of the barrier wall (70) of the inlet arrangement for collection of carry over (10) and through the second pass (82) of the regenerator (80) and further through the first pass (81) of the regenerator (80) and exits the regenerator (80) through the canal (85).

LIST OF REFERENCE CHARACTERS

[0104] 10 Inlet arrangement for collection of carry over [0105] 10a full height of inlet arrangement for collection of carry over [0106] 10b width of inlet arrangement for collection of carry over [0107] 10c depth of inlet arrangement for collection of carry over [0108] 10d height of inlet arrangement for collection of carry over in the corner between the barrier wall and the target wall [0109] 20 inlet wall of inlet arrangement for collection of carry over [0110] 21, 21 port [0111] 21a opening for a port [0112] 22 bottom edge of opening for the port [0113] 23 step [0114] 30 floor of inlet arrangement for collection of carry over [0115] 31 support [0116] 32 ceramic tubes [0117] 33 sub crown structure [0118] 40 roof of the inlet arrangement for collection of carry over [0119] 50 sidewall of the inlet arrangement for collection of carry over [0120] 60 target wall of the inlet arrangement for collection of carry over [0121] 61 holes for cleaning [0122] 70 barrier wall of the inlet arrangement for collection of carry over [0123] 71 recess [0124] 72 barrier [0125] 73 plane of the barrier wall [0126] 80 vertical regenerator [0127] 80, 80 regenerator chambers [0128] 80a height of the vertical regenerator [0129] 80b width of the vertical regenerator [0130] 80b, 80b width of the regenerator chambers [0131] 80c depth of the vertical regenerator [0132] 81 first pass (short pass) of regenerator (chamber) [0133] 82 second pass (long pass) of regenerator (chamber) [0134] 83 checkerwork bricks (checkers) [0135] 83a flue size of checkerwork brick [0136] 83b height of checkerwork brick [0137] 83c wall thickness of checkerwork brick [0138] 83d flue channel [0139] 84 division wall [0140] 85 canal [0141] 86 connection canal [0142] 87 rider arches [0143] 90 end-port furnace