FLUE BLOCK WITH INTEGRATED RISERS FOR A HEATING WALL OF A COKE OVEN BATTERY

Abstract

A flue block for a heating wall of a coke oven battery, the flue block having a proximal end and a distal end, the flue block comprising a first aperture disposed within the flue block, and a riser arranged in said first aperture. The flue block may also comprise a second aperture disposed therein, the second aperture spaced apart from the first aperture, and a second riser arranged in the second aperture. The flue block may be configured such that the riser is arranged to extend past the proximal end of the flue block. The flue block may be also configured such that the first riser extends past the proximal end. The flue block may be further configured such that the second riser extends past the proximal end.

Claims

1. A flue block for a heating wall of a coke oven battery, said flue block having a proximal end and a distal end, said flue block comprising: a first aperture disposed within said flue block; and, a riser arranged in said first aperture.

2. The flue block recited in claim 1, further comprising: a second aperture disposed therein, said second aperture spaced apart from said first aperture; and, a second riser arranged in said second aperture.

3. The flue block recited in claim 1, wherein said riser is arranged to extend past said proximal end of said flue block.

4. The flue block recited in claim 2 wherein said first riser extends past said proximal end.

5. The flue block recited in claim 2 wherein said second riser extends past said proximal end.

6. The flue block recited in claim 5, further comprising: a first end, said first end having a protruding section extending therefrom; and, a second end, said second end having a recessed section therein.

7. The flue block recited in claim 6, wherein said protruding section is arranged to be at least partially seated within a recessed section of an adjacently arranged flue block.

8. A flue block for a heating wall of a coke oven battery, comprising: a top end; a bottom end; a front end; a rear end; a first side end; a second side end; a first aperture extending from said top end to said bottom end; and, a first riser arranged in said first aperture.

9. The flue block as recited in claim 8, wherein said first side end comprises a recessed section therein and said second side end comprises a protruding extending therefrom.

10. The flue block as recited in claim 8, wherein said top end comprises at least one groove.

11. The flue block as recited in claim 8, wherein said first aperture is defined by at least one wall, and, said first riser extends from said at least one wall.

12. The flue block as recited in claim 8, wherein said first riser comprises a recess extending from said top end and said first riser comprises a countersink within said bottom end.

13. The flue block as recited in claim 8, further comprising: a second aperture extending from said top end to said bottom end, said second aperture being spaced apart from said first aperture; and, a second riser arranged in said second aperture.

14. The flue block as recited in claim 13, wherein: said second aperture is defined by at least one wall; and, said second riser extends from said at least one wall.

15. The flue block as recited in claim 13, wherein said second riser comprises a recess within said top surface and said second riser comprises a countersink within said bottom surface.

16. The flue block as recited in claim 15, wherein said recess is: constant in width in a first direction; and, variable in width in a second direction, perpendicular to said first direction.

17. A coke oven battery, comprising: a heating wall, including: a first flue; and, a second flue spaced apart from said first flue; and, a flue block for a heating wall of a coke oven battery, comprising: a top end; a bottom end; a front end; a rear end; a first side end; a second side end; a first aperture extending from said top end to said bottom end, said first aperture in fluid communication with said first flue; and, a first riser arranged in said first aperture.

18. The coke oven battery as recited in claim 13, further comprising: a second aperture extending from said top end to said bottom end, said second aperture in fluid communication with said second flue; and, a second riser arranged in said second aperture.

19. The coke oven battery as recited in claim 18, wherein said first aperture is defined by at least one wall, said first riser extends from said at least one wall, said second aperture is defined by at least one wall, said second riser extends from the at least one wall, wherein at least one of said first riser and said second riser comprises a countersink within said bottom surface, wherein said first riser comprises a counterbore recess within said top surface, wherein said second riser comprises a recess within said top surface.

20. A heating wall of a coke oven battery, comprising: a plurality of flue blocks, each said flue block including a flue; at least two risers, where each riser is located within one of said plurality of flues, wherein said at least two risers are of different heights.

21. A heating wall of a coke over battery, comprising a plurality of flue blocks, each said flue block including a flue and at least one riser positioned within one of said flues.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various embodiments are disclosed, by way of example only, with reference to the accompanying schematic drawings, in which corresponding reference symbols indicate corresponding parts, in which:

[0018] FIG. 1 is a partial perspective view of a coke oven battery, in accordance with some embodiments of the present invention;

[0019] FIG. 2 is a partial cross-sectional view of the coke oven battery taken generally along line 2-2 in FIG. 1;

[0020] FIG. 3A is a top front perspective view of a flue block, as shown in FIG. 1;

[0021] FIG. 3B is a bottom rear perspective view of the flue block shown in FIG. 3A;

[0022] FIG. 3C is a top elevational view of the flue block shown in FIG. 3A;

[0023] FIG. 4 is a cross-sectional view of the flue block taken generally along line 4-4 in FIG. 3A;

[0024] FIG. 5 is a cross-sectional view of the flue block taken generally along line 5-5 in FIG. 3A;

[0025] FIG. 6A is a perspective view of an alternative configuration of the flue block shown in FIG. 3A;

[0026] FIG. 6B is a cross-sectional view taken generally along line 6B-6B in FIG. 6A;

[0027] FIG. 7A is a perspective view of a second alternative configuration of the flue block shown in FIG. 3A; and,

[0028] FIG. 7B is a cross-sectional view taken generally along line 7B-7B in FIG. 7A.

DETAILED DESCRIPTION

[0029] At the outset, it should be appreciated that like drawing numbers on different drawing views identify identical, or functionally similar, structural elements. It is to be understood that the claims are not limited to the disclosed aspects.

[0030] Furthermore, it is understood that this disclosure is not limited to the particular methodology, materials and modifications described and as such may, of course, vary. It is also understood that the terminology used herein is for the purpose of describing particular aspects only, and is not intended to limit the scope of the claims.

[0031] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood to one of ordinary skill in the art to which this disclosure pertains. It should be understood that any methods, devices or materials similar or equivalent to those described herein can be used in the practice or testing of the example embodiments. The assembly of the present disclosure could be driven by hydraulics, electronics, pneumatics, and/or springs.

[0032] It should be appreciated that the term substantially is synonymous with terms such as nearly, very nearly, about, approximately, around, bordering on, close to, essentially, in the neighborhood of, in the vicinity of, etc., and such terms may be used interchangeably as appearing in the specification and claims. It should be appreciated that the term proximate is synonymous with terms such as nearby, close, adjacent, neighboring, immediate, adjoining, etc., and such terms may be used interchangeably as appearing in the specification and claims. The term approximately is intended to mean values within ten percent of the specified value.

[0033] It should be understood that use of or in the present application is with respect to a non-exclusive arrangement, unless stated otherwise. For example, when saying that item x is A or B, it is understood that this can mean one of the following: (1) item x is only one or the other of A and B; (2) item x is both A and B. Alternately stated, the word or is not used to define an exclusive or arrangement. For example, an exclusive or arrangement for the statement item x is A or B would require that x can be only one of A and B. Furthermore, as used herein, and/or is intended to mean a grammatical conjunction used to indicate that one or more of the elements or conditions recited may be included or occur. For example, a device comprising a first element, a second element and/or a third element, is intended to be construed as any one of the following structural arrangements: a device comprising a first element; a device comprising a second element; a device comprising a third element; a device comprising a first element and a second element; a device comprising a first element and a third element; a device comprising a first element, a second element and a third element; or, a device comprising a second element and a third element.

[0034] Moreover, as used herein, the phrases comprises at least one of and comprising at least one of in combination with a system or element is intended to mean that the system or element includes one or more of the elements listed after the phrase. For example, a device comprising at least one of: a first element; a second element; and, a third element, is intended to be construed as any one of the following structural arrangements: a device comprising a first element; a device comprising a second element; a device comprising a third element; a device comprising a first element and a second element; a device comprising a first element and a third element; a device comprising a first element, a second element and a third element; or, a device comprising a second element and a third element. A similar interpretation is intended when the phrase used in at least one of: is used herein.

[0035] As also used herein, the terms fluid communication, communication, and/or substantial equivalents thereof, are meant to mean two or more components are connected such that a substance, e.g., gases, fluid, etc., can flow between and/or within the two components. Fluid communication, communication, and/or equivalents thereof, are also intended to include heat transfer between two or more components.

[0036] It should be appreciated that the terms surface and end, used herein, are substantially interchangeable.

Coke Oven Battery

[0037] Referring now to the figures, FIG. 1 is a partial perspective view of coke oven battery 10, in accordance with some embodiments of the present disclosure. FIG. 2 is a partial cross-sectional view of coke oven battery 10 taken generally along line 2-2 in FIG. 1. Coke oven battery 10 generally comprises regenerator 20 and one or more ovens 34.

[0038] Regenerator 20 comprises a plurality of piers or pillars 22, which are spaced apart to form regenerator regions 24. In some embodiments, each of pillars 22 comprises a plurality of bricks or blocks. Pillars 20 support corbels 40. Each of corbels 40 comprises a plurality of blocks. In some configurations, corbels 40 comprise a plurality of blocks arranged in a plurality of tiers.

[0039] Corbels 40 are arranged on top of pillars 20 and support the oven section of coke oven battery 10. Specifically, corbels 40 support floor 28, heating walls 30, and coal 300 placed in ovens 34, allow air to flow between flues 32 and regenerator 20, and/or allow gas to be injected into flues 32. For example, gas or fuel is injected into corbels 40 horizontally via hole or through-bore 42 and flows vertically through through-bores 46 and into flues 32. Air flows up through through-bores 48 and into flues 32 where it mixes with the fuel and combusts to heat heating walls 30, thus cooking the coal arranged in ovens 34, transforming it into coke. (Coal 300 shown in the drawing is merely representative. In practice, the coal is crushed and blended prior to being charged in the coke oven.). Exhaust gases are created from such combustion, these hot exhaust gases may flow down through through-bores 48 and into regenerator regions 24, thereby preheating the incoming gas and/or air. Preheating gas and/or air as it flows into flues 32 prior to combustion is desirable because it produces more efficient vaporization and higher combustion efficiency than cold fuel. Coke oven battery 10 may further comprises shut-off means (not illustrated) operatively arranged to selectively shut off the gas flow through one or more through-bores 42. The shut-off means (e.g., valves) allow the operator to control the temperature in each flue 32 and thus ovens 34. As shown in FIGS. 1 and 2, coke oven battery 10 further comprises one or more flue blocks or modules 100 operatively arranged to facilitate the optimal transfer of fluids between corbels 40 and regenerator 20, and flues 32, as will be described in greater detail below.

[0040] Floor 28 is arranged on and/or engaged with corbels 40. Floor 28 is operatively arranged to support the coal in ovens 34. Floor 28 may comprise a plurality of blocks, where the plurality of blocks may be arranged in a plurality of tiers. Heating walls 30 are arranged on corbels 40 and/or floor 28 and comprise flues 32 arranged therein (32A-32H in FIG. 2), respectively. Flues 32 (flues 32A-32H in FIG. 2) are in fluid communication with through-bores 46 and through-bores 48. An oven ceiling can be arranged proximate the, or on, top of heating walls 30. Thus, coking ovens 34 are formed by floor 28, heating walls 30, and the oven ceiling. A battery top (represented in broken lines and 12 in FIG. 2) can be arranged on top of heating walls 30 and may enclose flues 32. In some configurations of coke oven 10, each flue 32 is in fluid communication with at least one through-bore 46 and at least one through-bore 48, which thereby provides gas (via through-bore 46) and air (via through-bore 48) to that flue. The arrangement of having at least one gas injection through-bore 46 and an air injection through-bore 48 in a single flue provides a desirable combustion mixture of air and fuel. Further, flue block 100 comprises risers, or vertical pipes, fluidly connected to through-bores 46 and through-bores 48 such that air and gas is mixed at different elevational levels within flues 32, as will be described in greater detail below.

Flue Block

[0041] FIG. 3A is a top front perspective view of flue block 100. FIG. 3B is a bottom rear perspective view of flue block 100. FIG. 3C is a top elevational view of flue block 100. FIG. 4 is a cross-sectional view of flue block 100 taken generally along line 4-4 in FIG. 3A. FIG. 5 is a cross-sectional view of flue block 100 taken generally along line 5-5 in FIG. 3A.

[0042] Flue block 100 comprises front surface 152, rear surface 154, top surface 156 (or proximal surface), bottom surface 158 (or distal surface), side surface 160, and side surface 162. In some embodiments, front surface 152 is arranged parallel to rear surface 154. In other embodiments, top surface 156 is arranged parallel to bottom surface 158. Side surface 160 may be arranged parallel to side surface 162. In a preferred embodiment flue block 100 is a single integrally formed element, as flue block 100 must also be composed of a material composition that can withstand at least 1,800 F. without deformation or deteriorationalthough flue block 100 may be configured with separate components that are fixedly secured thereto. It should be further appreciated that flue block 100 is composed of a material composition that can withstand the aforementioned temperature minimum during daily operation of the coke oven battery for a minimum of 20 years. The aforementioned material composition of flue block 100 preferably is approximately 90%, or greater, of SiO2 (Silicon Dioxide) and has modulus of rupture is approximately 6.9 MPa (MegaPascal) at 1090 C. and 3.5 MPa at 1480 C.

[0043] Side surface 160 preferably comprises recess 164. Recess 164 extends into side surface 160 in direction D1 and comprises a bottom surface and two side surfaces. The bottom surface is arranged parallel to side surface 160. The two side surfaces are arranged at angle A with respect to side surface 160. In some embodiments, angle A is an acute angle. In some configurations of flue block 100, recess 164 extends from top surface 156 to bottom surface 158. Recess 166 is substantially a recessed section or recessed portion and may be configured with different lengths, widths, shapes to accommodate different coke oven configurations-during repair and/or construction.

[0044] Side surface 162 comprises protrusion 166. Protrusion 166 extends from side surface 162 in direction D1. Protrusion 166 comprises a top surface and two side surfaces. As illustrated, the top surface, or proximal surface, is arranged parallel to side surface 162 and the two side surfaces are arranged perpendicular to side surface 162. In some embodiments, protrusion 166 extends from top surface 156 to bottom surface 158. Protrusion 166 is substantially a protruding section or protruding portion and may be configured with different lengths, widths, shapes to accommodate different coke oven configurations-during repair and/or construction.

[0045] It should be noted that recess 164 of flue block 100 is arranged to at least partially accept protrusion 166 of an adjacently arranged flue block 100 thereineliminating and/or limiting movement in directions D3 and D4 (as referenced in FIG. 3A) between the two adjacently arranged flue blocks.

[0046] Flue block 100 may further comprise at least one tapered surface, such as tapered surfaces 168A-B. Tapered surface 168A extends from front surface 152 to side surface 162 and tapered surface 168B extends from rear surface 154 to side surface 162. Tapered surfaces 168A-B effectively reduce a width of flue block 100. Tapered surfaces 168A-B are arranged at angle B with respect to front surface 152 and rear surface 154, respectively. In some embodiments, angle B is an acute angle. In a preferred embodiment, top surface 156 comprises at least one groove, for example grooves 170A-B. Groove 170A is arranged proximate to front surface 152 and extends from side surface 160 to side surface 162. In alternative configurations, groove 170A does not extend from side surface 160 to side surface 162. Groove 170B is arranged proximate to rear surface 154 and extends from side surface 160 to side surface 162. In other embodiments, groove 170B does not extend from side surface 160 to side surface 162. Although not illustrated, flue block 100 may also include at least one protruding member, extending from bottom surface 158, substantially collinearly arranged with a respective groove, 170A and/or 170B, and extending from side surface 160 to side surface 162. This protruding member is arranged to be seated in one of the grooves, 170A and/or 170B when the respective flue block is arranged on top of another flue block, thereby limiting movement in directions D3 and D4.

[0047] Flue block 100 further comprises aperture or flue 180 extending from top surface 156 to bottom surface 158. Aperture 180 forms at least a portion of the flue with which it is aligned. Aperture 180 may be defined by walls 182A-D. Alternatively, aperture 180 may be defined by a singular wall, i.e., circular, or rounded. Wall 182A is parallel to wall 182C, and wall 182B is parallel to wall 182D. Riser 184 is arranged in aperture 180. Specifically, riser 184 extends from wall 182D in direction D1. As shown and in a preferred embodiment, riser 184 is arranged between and spaced apart from walls 182A and 182Calthough it should be appreciated that riser 184 may be positioned alternatively within aperture 180. Riser 184 comprises through-bore 190 which extends completely therethrough. Hole 190 is operatively arranged to be in fluid communication with through-bore 46. Specifically, gas flows through through-bore 42, up through through-bore 46, and then up through through-bore 190. Riser 184, and thus through-bore 190, is considered a pass through riser in that gas does not release into flue 32 therefrom. Rather, after flowing through through-bore 190, gas enters an additional conduit 36, as best shown in FIG. 2, such that it can be released into flue 32 at a higher elevational level. In some embodiments, gas is released into flue 32 from through-bore 190. In some embodiments, through-bore 190 comprises counterbore or recess 192 extending from top surface 156 (See FIG. 4). Recess 192 may interact with a nipple or protrusion on conduit 36 such that a better seal is formed therebetween-a fluid connection is formed. In some embodiments, through-bore 190 comprises countersink or recess 194 extending from bottom surface 158. Countersink 194 forms a nozzle of decreasing diameter that increases the velocity of the gas flowing from corbel 40 to flues 32.

[0048] The portion of aperture 180 formed around riser 184 is in fluid communication with or fluidly connected to through-bore 48. Thus, the flow of air and exhaust gases between flues 32 and regenerator 20 occurs through aperture 180. Air, exiting through-bore 46, is mixed with gas in flue 32B elevationally above top surface 156, after such air flows through aperture 180 around riser 184, and up past conduit 36 (See, FIG. 2).

[0049] Flue block 100 further comprises aperture or flue 200 extending from top surface 156 to bottom surface 158. Aperture 200 forms at least a portion of the flue with which it is aligned. Aperture 200 is defined by walls 202A-D. Alternatively, aperture 200 may be defined by a single wall, i.e., circular or rounded. Wall 202A may be arranged parallel to wall 202C, and wall 202B may be arranged parallel to wall 202D. Riser 204 is arranged in aperture 200. Specifically, riser 204 extends from wall 202D in direction D1. In some embodiments, riser 204 is arranged between and spaced apart from walls 202A and 202C. Riser 204 comprises through-bore 210 which extends completely therethrough. Through-bore 210 is operatively arranged to be in fluid communication with through-bore 46. Specifically, gas flows through through-bore 42, up through through-bore 46, and then up through through-bore 210. Riser 204, and thus through-bore 210, is considered a distribution riser in that gas is released into flue 32 directly therefrom. For example, as best shown in FIG. 2, gas is released into flue 32A directly from riser 204. In some embodiments, through-bore 210 is connected to a conduit such that gas is released at a higher elevational level within the flue. Through-bore 210 may also comprise recess 212, disposed within top surface 156. Recess 212 preferably has a constant width, or a width equal to that of through-bore 210, in direction D1 and direction D2 (See FIG. 4). Recess 212 comprises a variable width in direction D3 and direction D4, specifically, increasing in width from through-bore 210 to top surface 156 (See FIG. 5). The increase in the width of through-bore 210 approaching the output of riser 204 acts as an eductor, or divergent nozzle, which increases the volume of the gas being released into the flue. This configuration provides for a better mixing of gas and air and thus better combustion within the flue. In some embodiments, through-bore 210 comprises countersink or recess 204 extending from bottom surface 158. Countersink 204 forms a nozzle of decreasing diameter that increases the velocity of the gas flowing from corbel 40 to flues 32.

[0050] Wall 202B may further comprises recess 206. Recess 206 extends from top surface 156 to bottom surface 158. As shown, recess 206 is arranged between and spaced apart from wall 202A and wall 202C. Recess 206 comprises a bottom surface and two side surfaces. In some configurations, the bottom surface is arranged parallel to wall 202B and the two side surfaces are tapered in direction D1.

[0051] The portion of aperture 200 formed around riser 204 is in fluid communication with or fluidly connected to through-bore 48. Thus, the flow of air and exhaust gases between flues 32 and regenerator 20 occurs through aperture 200. In some embodiments, and as shown, air from through-bore 46 is mixed with gas in flue 32A at top surface 156, after such air flows through aperture 200 around riser 204 (See FIG. 2).

[0052] In an example embodiment, and as best shown in FIG. 2, flue block 100 is arranged on corbel 40 such that bottom surface 158 is engaged therewith. Aperture 180 and riser 184 is arranged in/fluidly connected to flue 32B. Specifically, air from regenerator 20 flows into flue 32B via aperture 180 and through-bore 48. Through-bore 190 is fluidly connected to through-bore 46 such that gas flows into flue 32B through through-bore 190. In some embodiments, through-bore 190 is further connected to conduit 36 such that gas is released into flue 32B at an elevationally higher level than top surface 156. Aperture 200 and riser 204 is arranged in/fluidly connected to flue 32A. Specifically, air from regenerator 20 flows into flue 32A via aperture 200 and through-bore 48. Through-bore 210 is fluidly connected to through-bore 46 such that gas flows into flue 32A through through-bore 210 at top surface 156.

Flue Block: Alternative Configurations

[0053] The following description should be taken in consideration of the aforementioned figures and FIGS. 6A through 7B. FIGS. 6A through 7B generally illustrate alternative configurations of flue block 100, specifically FIG. 6A illustrates a perspective view of flue block 100A, FIG. 6B illustrates a cross-sectional view taken generally along lines 6B-6B in FIG. 6A, FIG. 7A illustrates a perspective view of flue block 100B, and FIG. 7B illustrates a cross-sectional view taken generally along lines 7B-7B in FIG. 7A. Broadly, flue blocks 100A and 100B are representative embodiments of alternative configurations of flue block 100, and comprise substantially the same components, as described supra.

[0054] Flue block 100A includes extension 184A. Extension 184A is arranged to extend from riser 184 and in a direction away from top surface 156. Extension 184A is substantially equivalent to conduit 36, shown in FIG. 2. Extension 184A (or conduit) allows gas traveling through through-bore 190 to be released into a flue at an elevationally higher level than top surface 156. This distance between apex 184B of extension 184A and top surface 156 is length L1.

[0055] Flue block 110B includes extensions 184A and 204A, extending from risers 184 and 204, respectively. Extensions 184A and 204A are arranged to extend from their respective risers in a direction away from top surface 156. Extension 184A (or conduit) allows gas traveling through through-bore 190 to be released into a flue at an elevationally higher level than top surface 156. This distance between apex 184B of extension 184A and top surface 156 is length L2. Extension 204A (or conduit) allows gas traveling through through-bore 210 to be released into a flue at an elevationally higher level than top surface 156, and at an elevationally higher level than extension 184Aallowing greater variation in the elevational levels of mixing between gas and air. The distance between apex 184B of extension 184A and top surface 156 is length L2. The distance between apex 204B of extension 204A and top surface 156 is length L3greater than L2.

[0056] It should be noted that various components of the flue block of the present invention may have variations. For example, the through-bores described supra, are not limited to a cylindrical shape, and may take alternative forms, e.g., rectangular, triangular, etc. As such, the risers, apertures, countersinks, recesses, and the like, may also take alternative forms.

[0057] It will be appreciated that various aspects of the disclosure above and other features and functions, or alternatives thereof, may be desirably combined into many other different systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may be subsequently made by those skilled in the art which are also intended to be encompassed by the following claims.

LIST OF REFERENCE NUMERALS

[0058] 10 Coke oven battery [0059] 12 Battery top [0060] 20 Regenerator [0061] 22 Pier or pillar [0062] 24 Regenerator region [0063] 28 Floor [0064] 30 Heating wall(s) [0065] 32 Flue(s) [0066] 32A Flue [0067] 32B Flue [0068] 32C Flue [0069] 32D Flue [0070] 32E Flue [0071] 32F Flue [0072] 32G Flue [0073] 32H Flue [0074] 34 Oven [0075] 36 Conduit [0076] 40 Corbel [0077] 42 Through-bore [0078] 46 Through-bore [0079] 48 Through-bore [0080] 100 Flue block or module [0081] 100A Flue block or module [0082] 100B Flue block or module [0083] 152 Front surface [0084] 154 Rear surface [0085] 156 Top surface [0086] 158 Bottom surface [0087] 160 Side surface [0088] 162 Side surface [0089] 164 Recess [0090] 166 Protrusion [0091] 168A Taper [0092] 168B Taper [0093] 170A Groove [0094] 170B Groove [0095] 180 Aperture or flue [0096] 182A Wall [0097] 182B Wall [0098] 182C Wall [0099] 182D Wall [0100] 184 Riser [0101] 184A Extension of riser 184 [0102] 184B Apex of extension 184A [0103] 190 Through-bore [0104] 192 Counterbore or recess [0105] 194 Countersink or recess [0106] 200 Aperture or flue [0107] 202A Wall [0108] 202B Wall [0109] 202C Wall [0110] 202D Wall [0111] 204 Riser [0112] 204A Extension of riser 204 [0113] 204B Apex of extension 204A [0114] 206 Recess [0115] 210 Through-bore [0116] 212 Recess [0117] 214 Countersink or recess [0118] 300 Coal [0119] A Angle [0120] B Angle [0121] D1 Direction [0122] D2 Direction [0123] D3 Direction [0124] D4 Direction [0125] L1 Length [0126] L2 Length [0127] L3 Length