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WO1993023708A1 - Grille d'event a flux d'air controle - Google Patents

Grille d'event a flux d'air controle Download PDF

Info

Publication number
WO1993023708A1
WO1993023708A1 PCT/US1993/004759 US9304759W WO9323708A1 WO 1993023708 A1 WO1993023708 A1 WO 1993023708A1 US 9304759 W US9304759 W US 9304759W WO 9323708 A1 WO9323708 A1 WO 9323708A1
Authority
WO
WIPO (PCT)
Prior art keywords
air distribution
air
grate plate
grate
exposed area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1993/004759
Other languages
English (en)
Inventor
Edward L. Puschock
Shane K. Alesi
Robert H. Holland
George W. Bryde
Michael R. Massaro, Jr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuller Co
Original Assignee
Fuller Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuller Co filed Critical Fuller Co
Priority to JP6502701A priority Critical patent/JPH07508093A/ja
Priority to KR1019940700166A priority patent/KR0144286B1/ko
Publication of WO1993023708A1 publication Critical patent/WO1993023708A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • F27D15/0213—Cooling with means to convey the charge comprising a cooling grate
    • F27D15/022—Cooling with means to convey the charge comprising a cooling grate grate plates

Definitions

  • the invention relates in general terms to an apparatus for cooling hot material which is, for example, discharged from a kiln.
  • a cooling apparatus of the general class to which the invention relates is used to cool particulate material (e.g., cement clinker or other mineral materials) , which has been burnt in a kiln.
  • particulate material e.g., cement clinker or other mineral materials
  • Such apparatus can comprise traveling grate coolers, thrust grate coolers, and the like.
  • the hot particulate material discharged from the kiln outlet typically undergoes quenching in the material inlet part of the cooling apparatus and is then moved, distributed as well as possible, to consecutive rows of grates on which additional cooling is then carried out while the material to be cooled is transported along a path extending from the material inlet to the material outlet of the cooler on said grates.
  • the cooling air which is blown through the hot material in the recuperation zone of the cooling apparatus is then reused or recycled further generally as air for combustion in the preceding kiln.
  • Grates for cooling or combustion are generally equipped with overlapping rows of grate plates, of which some are mounted in a fixed position and others are reciprocating, which generally means that they oscillate in a longitudinal direction, with the forward stroke of the oscillation being the direction in which the particulate material to be cooled travels through the cooler, and they thereby serve in part to facilitate the movement of the material through the cooler.
  • the grate plates are mounted on a carrier beam which is transverse to the direction of material flow through the cooler, with adjoining grate plates abutting.
  • the air needed for cooling or combustion is introduced from below the grate plates through port like openings to enter, penetrate and pass through the bed of material to be cooled or burned, with said material lying on top of the grate plate.
  • the grate plates are subject to wear through mechanical and thermal effects.
  • the exposed area of the grate which lies closer to the discharge end of the cooler, is subject to considerable abrasive wear and thermal exposure, whereas the rear, unexposed, part of the grate Docket No. 1016 plate is subject to less wear, and only minimal thermal exposure.
  • Grate plates are provided in numerous configurations.
  • One popular configuration is the so-called flat grate plate style, which, as its name implies, employs a flat surface on which the clinker is supported as it is transported through the cooler.
  • ports through which cooling air passes are located on the surface of the grate. Clinker will therefore rest directly on top of the ports.
  • clinker will sift through the ports, clog the air passageways and at times fall on the underlying supporting structure, causing possible damage to the supporting structure and, at times, an uneven distribution of cooling air flow resulting in a grate plate system having hot areas which can exceed metal endurance limits.
  • the wedge grate style in which the front area, which comprises part of the exposed area of the grate, is bent or inclined upward at an angle relative to the flat, horizontal plane of the remaining area of the grate.
  • This design provided a partially defined area, at the point of the bend, in which the clinker could rest on the surface of the grate.
  • This design also served to slow the flow of clinker through the cooler, which ultimately was somewhat successful in retarding red river conditions within the cooler. Air typically was distributed into the clinker through openings located in the upwardly inclined area of the grate plate.
  • This design did not contain any anti- sifting features, as smaller particles of hot clinker could enter and clog the air distribution holes or pass through the holes into the air distribution compartments below the grate. In addition, there was only a limited tendency for the clinker to remain static within this particular design of grate. This design was utilized primarily in the mid 1950's through the 1960's.
  • grate plate in the early 1950 , s the assignee of the present invention designed and sold a particular design of a grate plate popularly known as a "pan" grate plate which in essence comprised a grate plate having on its upper surface a large depression in which clinker could be retained.
  • the primary purpose was to retain the majority of clinker material located within the depression in a basic static condition, which thereby resulted in improved grate plate life through a reduction in wear and better resistance to red river thermal shock conditions.
  • the grate plate could be utilized in a reciprocating or a stationary mode.
  • this prior art grate plate had a pan-like configuration, resulting in its popular name, with differing degrees of depressions with the deepest depression located in the rear of the grate plate in the unexposed area of the grate plate.
  • the depression was not as deep toward the front of the grate plate, that is, the portion of the grate closer to the material outlet of the cooler.
  • the present invention relates to a grate plate for transporting particulate and solid material in a predetermined direction through a cooling apparatus.
  • the grate plate of the present invention is particularly well suited to receive a controlled supply of air.
  • the invention is particularly useful in the cooling of cement clinker after it exits a kiln.
  • the cooling apparatus in which the grate plate is employed is comprised of a material inlet, a material outlet, and a plurality of rows of grate plates, which typically alternate between being stationary or reciprocating. Each row of grate plates extends across the width of the cooler in a direction transverse to the material flow through the cooler. Each preceding row of plates overlaps the following row of plates.
  • each grate plate is attached to a carrier beam.
  • the upper surface of the grate plate is divided between an exposed area, which is never overlapped by any portion of a preceding grate and is located on the front portion of the grate plate, that is the portion which is closer to the material outlet end of the cooler, and an unexposed area, which is overlapped at least part of the time by a preceding grate.
  • the grate plate of the present invention is suitable for receiving a controlled supply of air.
  • substantially the entire surface area of the exposed surface is recessed from both the upper edges of its outside perimeter and the surface of the unexposed area, which is substantially level.
  • the recessed area is generally configurated to receive particulate material that is being cooled. Preferably, the majority of material residing within the recessed area will be in a static condition.
  • the topography of the exposed area, whether or not recessed, is defined by alternating rows of air distribution passages and secondary air distribution channels. Specifically, there is at least one, and preferably a plurality of substantially hollow air distribution passages that travel substantially the entire distance of the exposed area in a direction substantially parallel to the movement of material through the cooling apparatus.
  • An air chamber is located directly below the air distribution passages, and the secondary air channels which connects with a source of cooling air.
  • the air distribution passages have a top surface and two sides upon which some of the material transported through the cooling apparatus comes into contact.
  • the cooling air will enter the air distribution passages from the under side of the grate plate into an air chamber and will travel along the length of the passages and will exit into the secondary air channel via a plurality of air portals or outlets that are located on the side walls of the air distribution passages.
  • the conveying air is directed through material that is retained within the recessed area and/or through material that is being transported through the cooling apparatus by the grate plate.
  • the air distribution passage is adjacent on one or more of its longitudinal sides, depending upon whether it is located at the side or toward the center of the grate plate to an open, secondary air distribution channel that travels substantially the entire distance of the exposed area in a direction parallel to the movement of material through the cooling apparatus.
  • the secondary air distribution channels are either located between two adjacent air distribution passages or between an air distribution passage and a inner side wall of the exposed area of the grate plate. The alternating placement of air distribution conduits and secondary air distribution channels serves to create a ridged effect over the exposed area.
  • the exposed area is bordered by the front inner side wall of the grate plate, that is, the side wall opposite the front pusher face, the side inner walls of the exposed area of the grate plate and the adjacent side of the unexposed area running parallel to the front pusher face.
  • One of the advantages of the design of the cooling air distribution system of the grate plate of the present invention is that there is achieved a reduction, compared to a traditional grate plate design, of the velocity of the cooling air as it is both initially discharged from the air distribution outlets and as it travels through the area where the retained clinker rests.
  • This decrease in velocity presents a number of advantages, including: (1) enhanced heat recuperation, (2) higher secondary air temperatures, (3) not promoting a fluidized condition of the clinker during normal and red river states, (4) a greater retention factor of cooling air within the retained clinker mass, (5) less abrasive characteristics to the grate which result from high velocity entrained articles abrading the air outlets and the surrounding grate plate surface and (6) improved quenching, to name a few.
  • the actual air velocity realized is directly influenced in part by the configuration of the primary cooling air outlets which direct the discharge of cooling air into the secondary air channels and the configuration of such secondary air channels, both of which are further described below.
  • the velocity of the cooling air will be optimized to thereby utilize the minimum velocity of cooling air needed to adequately cool the material while promoting the desired anti-sifting and anti-fluidization features. It is understood, in this regard, that the ultimate velocity of the air through the secondary air channel is also a function of factors other than the design of the primary air outlet and the secondary air channel, one factor being the packing factor of any material that may come to reside within the secondary air channel.
  • Another advantage of the preferred design of the present invention is that the recessed area of the exposed area will essentially accommodate the material in a static condition. The reduction of movement of material relative to the exposed metal surface area of the grate plate will significantly reduce the wear in said section.
  • Figure 1 depicts a top view of one of the preferred embodiments of the present invention.
  • Figure 2 depicts a section view of the embodiment depicted in Figure 1, which is taken along axis A-A of Figure 1.
  • Figure 3 depicts another section view of the embodiment depicted in Figure l taken along axis B-B of Figure 2.
  • Like numerals in all drawings refer to like elements.
  • FIG. 1 there is depicted one embodiment of the grate plate of the present invention generally referred to by the numeral 20, which can be utilized in a stationary or reciprocating mode.
  • the view of grate plate 20 as set forth in Figure 1 is of its upper surface, which upper surface is divided into an exposed area generally referred to as 70, the longitudinal boundaries of which are as defined by the dotted line 61, and an unexposed area 71 as defined by lines 60. Material will travel through the cooler longitudinally in the direction represented by arrow F.
  • the boundaries of the exposed area are further defined by outer side walls 21 and 22 and front pusher face 23, which has a top edge 24, and edge 25 of the unexposed area.
  • a significant portion of the exposed area is recessed, with said recession measured from top edge 24 of front pusher face 23, top longitudinal edges 26 and 27 and front surface 28 of the unexposed area.
  • Cooling air is provided to air distribution passages 30 primarily from an air chamber 33 which is open to cooling air flowing from the carrier beam 80 that is located beneath the grate plate 20. Cooling air can enter air distribution passages 30 and air chamber 33 horizontally from the under portion of the grate plate near the junction point of the exposed and unexposed areas. Cooling air can also enter air distribution passages 30, and air chamber 33 in a vertical fashion.
  • the air distribution passages 30 are hollow structures which run essentially the entire exposed length, in parallel to the flow of material through the cooler.
  • Cooling air will travel through the air distribution passages 30 lengthwise in the same direction as material flow, that is, from rear to front. Cooling air is discharged from the air distribution passages 30 through primary air outlets 55 into secondary air channels 56, which, like passages 30, run substantially the entire length of the exposed area, and alternate with conduits 30 to fill substantially the entire recessed area.
  • the secondary air channels 56 can be either located, between two adjacent air distribution passages 30 (as depicted) or between an inner longitudinal edge 29 or 29a of grate plate 20 and an adjacent air conduit, this latter option not being depicted.
  • Air distribution passages 30 can either be separated from an inner side wall of the longitudinal edge of exposed area by a secondary air distribution channel or, in certain embodiments, they may be located flush with said inner side wall.
  • Air passing through primary air outlet 55 will be directed into secondary air channel 56.
  • the air is directed at a downward angle, that is, an angle somewhat below the horizontal, into said secondary air distribution channel 56.
  • the configuration of the secondary air channel 56 will of course be determined by the shape of at least one of the side walls 58 of the adjacent air distribution conduits 30.
  • Figure 2 displays the embodiment of the present invention wherein top surface 32 of the air conduit 30 overhangs, in a shroud like manner, primary air conduits 55 to thereby promote the anti-sifting features of the present invention.
  • better air distribution is also the result of there being an overhang which shrouds the primary air outlets and creates an exterior cooling air flow path which extends essentially the full length of the exposed area inside the secondary air distribution channel. Should one location in front of the shroud become blocked with clinker the air is free to migrate to a location where a blockage does not occur.
  • the primary air outlets 55 appear, on the side walls 58 of air distribution passages 30, preferably as rectangularly shaped slots 60 with the longer sides of the slots being substantially parallel to the direction of flow of material through the cooler.
  • the slots are preferably located in the lower section of the secondary air distribution channel 56. Since slots 60 are positioned on the side walls 58 of air distribution passages 30, air is initially discharged from the primary air outlet 55 in a direction transverse to the clinker flow through the cooler. Rather than there being one slot in each sidewall that runs the length of the air distribution conduit, there is a plurality of slots positioned along the length of each side wall 58. It has been found that this configuration has a number of advantages. For instance, the structural integrity of the grate plate is enhanced. The slots maintain a transport velocity which will minimize the backflush of material into the air conduit. Furthermore, by minimizing the discharge velocity the potential for fluidization will be reduced.
  • Figure 3 shows a preferred embodiment of the placement of slots 60.
  • the width and length of the slots may vary.
  • a particularly advantageous feature of this invention is the inclusion of a secondary air discharge channel 56 immediately adjoining and in fluid communication with the primary air outlet 55.
  • a secondary air discharge channel 56 immediately adjoining and in fluid communication with the primary air outlet 55.
  • the secondary air channels function as nozzles and serve to reduce the velocity of the cooling air discharged into the clinker retention area thereby reducing the possibility of fluidization of the clinker.
  • Air distribution passages 30 will generally be narrower than secondary air channels 56.
  • a preferred configuration for the secondary air channels is when their length to width ratio ranges from about 4:1 to about 12:1 and more preferably from about 6:1 to about 10:1. If the secondary air channels have a length to width ratio greater than 12:1, the velocity of the air passing through these channels will be higher than preferred. If the ratio is less than 4:1, the performance of the secondary air channel may be adversely affected and will not function as a nozzle.
  • one or more may optionally have variable widths and/or heights from a corresponding passage or channel.
  • all of the secondary air channels may be of the same depth and/or width and/or all of the air passages may be of the same height and/or width.
  • each of the air distribution passages 30 are preferably recessed from the plane depicted by line 40, preferably in a sufficient amount so that at least some, but preferably a majority, of the clinker within the recessed area will remain in a static condition.
  • side edge 27 is recessed from surface 40 to such an extent so that edge 21 of an adjoining grate plate will overlap therewith so that bottom edge 26a will mate with edge 27 to create an overlapping joint to thereby virtually eliminate clinker from falling between adjacent grate plates.
  • the longitudinal edges of the grate plate can be identical in height and shape to each other so that adjoining grate plates would abut rather than overlap.
  • the grate plates of the present invention may be modified in such a manner as known to those skilled to be utilized in any row of the cooler without changing the unique features thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Furnace Details (AREA)
  • Baking, Grill, Roasting (AREA)

Abstract

L'invention porte sur une grille (20) utilisée dans un appareil réfrigérant. Ladite grille présente une surface supérieure divisée en une zone exposée (20) et une zone non exposée (21). La zone exposée de la grille est définie par une pluralité de passages de distribution d'air (30).
PCT/US1993/004759 1992-05-19 1993-05-18 Grille d'event a flux d'air controle Ceased WO1993023708A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP6502701A JPH07508093A (ja) 1992-05-19 1993-05-18 空気を制御した火格子板
KR1019940700166A KR0144286B1 (ko) 1992-05-19 1993-05-18 제어식 공기 격자판

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US88599692A 1992-05-19 1992-05-19
US07/885,996 1992-05-19

Publications (1)

Publication Number Publication Date
WO1993023708A1 true WO1993023708A1 (fr) 1993-11-25

Family

ID=25388153

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/004759 Ceased WO1993023708A1 (fr) 1992-05-19 1993-05-18 Grille d'event a flux d'air controle

Country Status (5)

Country Link
JP (1) JPH07508093A (fr)
KR (1) KR0144286B1 (fr)
CA (1) CA2113429A1 (fr)
MX (1) MX9302918A (fr)
WO (1) WO1993023708A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0677714A1 (fr) * 1994-04-14 1995-10-18 Krupp Polysius Ag Refroidisseur à grilles poussantes
US5992334A (en) * 1996-08-22 1999-11-30 Von Wedel; Karl Loose-material grate with volumetric control of gaseous coolant
RU2300704C1 (ru) * 2006-02-14 2007-06-10 Федеральное государственное унитарное предприятие "Московское машиностроительное производственное предприятие "Салют" Колосниковая решетка

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6550331B2 (ja) * 2015-12-28 2019-07-24 クボタ環境サ−ビス株式会社 火格子及びストーカ式焼却炉の炉床

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2745364A (en) * 1948-10-01 1956-05-15 Martin Johannes Josef Combustion air supply through grates and grate construction
US4672947A (en) * 1982-08-17 1987-06-16 Martin Johannes J E Grate bar for use in industrial furnaces
US4876972A (en) * 1987-01-21 1989-10-31 Louis Mrklas Grate bar element for a sliding grate furnace for garbage incineration

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2745364A (en) * 1948-10-01 1956-05-15 Martin Johannes Josef Combustion air supply through grates and grate construction
US4672947A (en) * 1982-08-17 1987-06-16 Martin Johannes J E Grate bar for use in industrial furnaces
US4876972A (en) * 1987-01-21 1989-10-31 Louis Mrklas Grate bar element for a sliding grate furnace for garbage incineration

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0677714A1 (fr) * 1994-04-14 1995-10-18 Krupp Polysius Ag Refroidisseur à grilles poussantes
US5992334A (en) * 1996-08-22 1999-11-30 Von Wedel; Karl Loose-material grate with volumetric control of gaseous coolant
RU2300704C1 (ru) * 2006-02-14 2007-06-10 Федеральное государственное унитарное предприятие "Московское машиностроительное производственное предприятие "Салют" Колосниковая решетка

Also Published As

Publication number Publication date
JPH07508093A (ja) 1995-09-07
MX9302918A (es) 1994-08-31
KR0144286B1 (ko) 1998-08-17
CA2113429A1 (fr) 1993-11-25

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