CA1269891A - Solid fuel transfer and seal system - Google Patents
Solid fuel transfer and seal systemInfo
- Publication number
- CA1269891A CA1269891A CA000500686A CA500686A CA1269891A CA 1269891 A CA1269891 A CA 1269891A CA 000500686 A CA000500686 A CA 000500686A CA 500686 A CA500686 A CA 500686A CA 1269891 A CA1269891 A CA 1269891A
- Authority
- CA
- Canada
- Prior art keywords
- opening
- seal
- chamber
- plug unit
- discharge
- 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.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
- Discharge Of Articles From Conveyors (AREA)
Abstract
SOLID FUEL TRANSFER AND SEAL SYSTEM
Abstract of the Disclosure A solid fuel transfer and seal system in which a seal chamber receives a fuel material and a valve is provided for opening and closing a discharge opening in the seal chamber.
A seal plug unit moves across the chamber to push the fuel material contained in said chamber towards the discharge opening. The valve is opened in response to a predetermined amount of movement of the seal plug unit towards the discharge opening and the seal plug unit seals the inlet opening from the discharge opening after opening of the valve.
Abstract of the Disclosure A solid fuel transfer and seal system in which a seal chamber receives a fuel material and a valve is provided for opening and closing a discharge opening in the seal chamber.
A seal plug unit moves across the chamber to push the fuel material contained in said chamber towards the discharge opening. The valve is opened in response to a predetermined amount of movement of the seal plug unit towards the discharge opening and the seal plug unit seals the inlet opening from the discharge opening after opening of the valve.
Description
` lZ6~89~
SOLID FUEL TRAN5FER AND SEAI. SYS~EM
Backqround of the Invention This invention relates to a solids fuel transfer and seal system and, more particularly, to such a system for metering a precise amount of fuel between a source and a furnace, or the like, while positively sealing against atmospheric pressure.
In large furnaces such as, for example, those associated with a steam generator, or the like, a large number of bur-ners extend around the furnace and are fed fuel, such ascoal material, rom a single source. In these type of arrangements, it is difficult to exactly meter a precise amount of coal to each burner, and in addition, seal against atmospheric pressure, i.e. tramp air. Al~hough various techniques have been devised, none has proven to be absolu-tely satisfactory from both a precise metering standpoint and a seal standpoint.
Summary of the Invention It is therefore an object of the present invention to provide a solid fuel transfer and seal system in which a precise amount of fuel is metered from a source and trans-ferred to the burners in the furnace.
~6~
.~ --2--It is a further object of -the present invention to provide a sys-tem of the above type which provides a positive seal against atmospheric pressure.
It is a further object of the present invention to provide a system of the above type which is simple in operation, efficient in use and relatively inexpensive in cost.
Toward the fulfil~ment of these and other objects, the solid fuel transfer and seal system of the present invention includes a horizontal conveyor which deposits material from an external source onto the hopper portion of a transfer seal system, including a discharge valve at one end and a seal at the other end. The amount of material in the hopper is sensed and a moveable seal unit moves the material forward towards the discharge valve which is opened at the appropriate time. After the material has been discharged into a 15 discharge hopper, the seal unit reverses its motion and returns to the opposite end of the system and the discharge gate is closed before a new cycle begins.
M~re particularly, the present invention comprises a source of solid fuel material; a seal chamber having an inlet opening for receiving the fuel material and a discharge opening disp~sed at one end of the chamber; conveyor means for receiving the fuel material from the source and discharging the fuel material to the inlet opening; valve means for opening and closing the discharge opening;
"
91~
-2a-a seal plug unit disposed in a resting position at the other end of the chamber and de-fining a wall of the chamber, the seal plug unit being movable across the chamber to push towards the discharge end all of the fuel material contained in the chamber between the inlet opening, the discharge opening and the seal plug unit; means responsive to a predeterrnined amount of movement of the seal plug unit towards the discharge opening for opening the valve means; a surface of the seal plug unit extending immediately adjacent to and spanning the inlet opening to seal the inlet opening from the discharge opening during and after opening of the valve means; means responsive to the seal plug unit reaching the discharge end for reversing the movernent of the seal plug unit away frcm the discharge end and towards the resting position; means responsive to a predeterrnined amount of movement of the seal plug uni.t towards the resting position for closing the valve means; the sea:l plug unit sealiny -the inlet opening until the valve means is closed; means for forming a hopper c~nmunicating with t:he discharge opening; and conveyor means for transferring the fuel material from the hopper means to a discharge chute.
Brief Description of the Dra~ing The above description, as well as further objects, features, and advantages, of the present invention will be more fully appreciated by reference to the following detailed description of the presently preferred but nonethe-~;~6~8~
less illustrative embodiment in accordance with the presentinvention, when taken in connection with the accompanying drawing in which the drawing is a cross-sectional view depicting the fuel transfer and seal system of the presen~
invention.
Description of the Preferred Embodiments The reference numeral 10 refers in general to a housing configured to form an inlet conveying chamber 12, a storage and sealing chamber 14 and an outlet conveying chamber 16.
A runway 18 is supported on the floor 20 of the housing 10 and receives a seal plug unit 22 which traverses the runway in a manner to be described.
An endless loop conveyor belt 24 extends into the inlet conveying chamber 12 and has an inlet end portion 24A
disposed adjacent the housing 10, and a discharge end por-tion 24~ disposed in the chamber 12. The conve~or belt 24 receives the solid material to be conveyed, such as coal, from a source, via a chute 26, and conveys the material in a horizontal direction through the chamber 12. The material discharges off the discharge end 24B of the conveyor 24 and downwardly by gravity through an inlet opening 14A of the chamber 14 and into the latter chamber, as shown by the arrows.
~69E3~
The chamber 14 has a discharge end 14B over which is mounted a discharge valve, or gate, 30 pivotally mounted on a top shaft, or hinge, 32 and adapted to be moved in a con-ventional manner between a closed position shown by the solid lines to an open position shown by the dashed lines, to respectively close and open the discharge end 14B.
An inclined conveyor belt 34 is disposed in the chamber 16 and together with a portion of the housing 10, defines a hopper 36 for receiving the material to be transferred from the chamber 14, as will be described. The conveyor belt 34 has a lower, inlet end portion 34a adjacent the hopper 36 and an upper discharge end portion 34B. The material thus travels through the chamber 16, via the conveyor belt 34, before discharging by gravity, via a discharge chute 38 registering with the chamber 14, to a furnace, or the like ~not shown).
The seal plug unit 22 is shown in its inactive position in the drawings in which its leading end portion 22A defines one end of the chamber 14. The unit 22 is adapted to move in a direction from right-to-left, as viewed in the drawing, towards the discharge opening 14B, as well in a reverse direction, and its movement, as well as movement of the valve 30, is contolled by a three limit switches 40, 42 and 44 associated with the runway 18, which respond to the loca-1;~i~8~3~
tion of the unit on the runway, as will be described.
It is understood that the seal plug unit 22 and the valve 30 can be powered in any conventional manner and, for the purpose of example, are operated pneumatically.
In operation, a solid particulate or shredded fuel material is conveyed onto the upper surface of the inlet end portion 24A of the conveyor 24, via the discharge chute 26.
The material traverses the length of the conveyor 24 before falling off the discharge end 24B by gravity. The fuel material then passes through the inlet opening 14a of thechamber 14 where it accumulates in the space between the valve 30. and the end portion 22A of the seal plug unit 22.
A level limit switch or metering device (not shown) associated w.ith the conveyor belt 24, or the chute 26, pro~
vides a signal when a predetermined amount o fuel material has accumulated for actuating the seal plug unit 22. This causes the unit 22 to traverse the runway 18 in a direction from right-to-left as viewed in the drawing~ whereby it pushes the amount of fuel material accumulating in the chamber 14 towards the discharge opening 14B. The seal plug unit 22 continues movement until it spans the opening 14A, after which time the limit switch 40 actuates the valve 30 to its open position shown by the dashed lines. This enables the metered amount of fuel material to discharge by ~6~
gravity into the hopper 36. The conveyor belt 34 then tran~ers the metered amount of fuel in the hopper 36 to the chute 38 from which it i~ introduced to the furnace.
The seal plug unit 22 continues its forward movement until its forward end extend~ a short dista~ce past the discharge spening 14B at which time the second limit ~witch 42 terminate~ further movement of the unit in the forward direction, init.iates a slight pause, and then rever~e~ move-ment of the unit towards its inactive position. During thi~
return movement the limit switch 40 initiate~ closi~g of the valve 30 when the unit spans the opening 14A, and the li~it swit~h 44 stopQ the reverse movement and transfers the operation back to the level limit or metering ~witche~. It is understood that the entire circ~litry just described ca~
be incorporated and sequenced into a fuel feed systP~ and boiler master control to further control the operation of the system of the present invention in accordance with ~uel supply and demand needs.
A~ the plug unit 22 travels by and spans the i~let opening 14A it achieves a positive seal between the atmosphere a~d the hopper 36 to prevent the introduction o~
at~ospheric air, i.e. tramp air, into the latter hopper.
Also, by virtue of ~he syst~m of the pre~ent invention, a precise amount of fuel material i~ metered from the chute 26 /
t, ~269~
to the hopper 36 and, from the latter, to the discharge chute 38. Also, in the movement of the seal plug unit 22, thç discharge gate is opened and closed while the unit 22 is spanning the opening 14a to ensu~e continuity of the afore-mentioned seal.
It is thu~ seen that the fuel transfer and Yeal 5ys~mof the present invention provides an efi~ient and simple operation at a relatively low co~t while achievin~ the aforementioned advantages.
A latitude of modification, change and ~ub~titution i9 intended in the foregoing disclosure and in ~ome ins~a~s some features o the i~vention will be employ~d wi~hout.a corresponding use of other fea~ure-~ Accordi~gly, it i~
appxopriat~ that the appended claims be con~trued broædly and in a manner consistent with thç spirit and ~cope o~ ~he invention herein.
SOLID FUEL TRAN5FER AND SEAI. SYS~EM
Backqround of the Invention This invention relates to a solids fuel transfer and seal system and, more particularly, to such a system for metering a precise amount of fuel between a source and a furnace, or the like, while positively sealing against atmospheric pressure.
In large furnaces such as, for example, those associated with a steam generator, or the like, a large number of bur-ners extend around the furnace and are fed fuel, such ascoal material, rom a single source. In these type of arrangements, it is difficult to exactly meter a precise amount of coal to each burner, and in addition, seal against atmospheric pressure, i.e. tramp air. Al~hough various techniques have been devised, none has proven to be absolu-tely satisfactory from both a precise metering standpoint and a seal standpoint.
Summary of the Invention It is therefore an object of the present invention to provide a solid fuel transfer and seal system in which a precise amount of fuel is metered from a source and trans-ferred to the burners in the furnace.
~6~
.~ --2--It is a further object of -the present invention to provide a sys-tem of the above type which provides a positive seal against atmospheric pressure.
It is a further object of the present invention to provide a system of the above type which is simple in operation, efficient in use and relatively inexpensive in cost.
Toward the fulfil~ment of these and other objects, the solid fuel transfer and seal system of the present invention includes a horizontal conveyor which deposits material from an external source onto the hopper portion of a transfer seal system, including a discharge valve at one end and a seal at the other end. The amount of material in the hopper is sensed and a moveable seal unit moves the material forward towards the discharge valve which is opened at the appropriate time. After the material has been discharged into a 15 discharge hopper, the seal unit reverses its motion and returns to the opposite end of the system and the discharge gate is closed before a new cycle begins.
M~re particularly, the present invention comprises a source of solid fuel material; a seal chamber having an inlet opening for receiving the fuel material and a discharge opening disp~sed at one end of the chamber; conveyor means for receiving the fuel material from the source and discharging the fuel material to the inlet opening; valve means for opening and closing the discharge opening;
"
91~
-2a-a seal plug unit disposed in a resting position at the other end of the chamber and de-fining a wall of the chamber, the seal plug unit being movable across the chamber to push towards the discharge end all of the fuel material contained in the chamber between the inlet opening, the discharge opening and the seal plug unit; means responsive to a predeterrnined amount of movement of the seal plug unit towards the discharge opening for opening the valve means; a surface of the seal plug unit extending immediately adjacent to and spanning the inlet opening to seal the inlet opening from the discharge opening during and after opening of the valve means; means responsive to the seal plug unit reaching the discharge end for reversing the movernent of the seal plug unit away frcm the discharge end and towards the resting position; means responsive to a predeterrnined amount of movement of the seal plug uni.t towards the resting position for closing the valve means; the sea:l plug unit sealiny -the inlet opening until the valve means is closed; means for forming a hopper c~nmunicating with t:he discharge opening; and conveyor means for transferring the fuel material from the hopper means to a discharge chute.
Brief Description of the Dra~ing The above description, as well as further objects, features, and advantages, of the present invention will be more fully appreciated by reference to the following detailed description of the presently preferred but nonethe-~;~6~8~
less illustrative embodiment in accordance with the presentinvention, when taken in connection with the accompanying drawing in which the drawing is a cross-sectional view depicting the fuel transfer and seal system of the presen~
invention.
Description of the Preferred Embodiments The reference numeral 10 refers in general to a housing configured to form an inlet conveying chamber 12, a storage and sealing chamber 14 and an outlet conveying chamber 16.
A runway 18 is supported on the floor 20 of the housing 10 and receives a seal plug unit 22 which traverses the runway in a manner to be described.
An endless loop conveyor belt 24 extends into the inlet conveying chamber 12 and has an inlet end portion 24A
disposed adjacent the housing 10, and a discharge end por-tion 24~ disposed in the chamber 12. The conve~or belt 24 receives the solid material to be conveyed, such as coal, from a source, via a chute 26, and conveys the material in a horizontal direction through the chamber 12. The material discharges off the discharge end 24B of the conveyor 24 and downwardly by gravity through an inlet opening 14A of the chamber 14 and into the latter chamber, as shown by the arrows.
~69E3~
The chamber 14 has a discharge end 14B over which is mounted a discharge valve, or gate, 30 pivotally mounted on a top shaft, or hinge, 32 and adapted to be moved in a con-ventional manner between a closed position shown by the solid lines to an open position shown by the dashed lines, to respectively close and open the discharge end 14B.
An inclined conveyor belt 34 is disposed in the chamber 16 and together with a portion of the housing 10, defines a hopper 36 for receiving the material to be transferred from the chamber 14, as will be described. The conveyor belt 34 has a lower, inlet end portion 34a adjacent the hopper 36 and an upper discharge end portion 34B. The material thus travels through the chamber 16, via the conveyor belt 34, before discharging by gravity, via a discharge chute 38 registering with the chamber 14, to a furnace, or the like ~not shown).
The seal plug unit 22 is shown in its inactive position in the drawings in which its leading end portion 22A defines one end of the chamber 14. The unit 22 is adapted to move in a direction from right-to-left, as viewed in the drawing, towards the discharge opening 14B, as well in a reverse direction, and its movement, as well as movement of the valve 30, is contolled by a three limit switches 40, 42 and 44 associated with the runway 18, which respond to the loca-1;~i~8~3~
tion of the unit on the runway, as will be described.
It is understood that the seal plug unit 22 and the valve 30 can be powered in any conventional manner and, for the purpose of example, are operated pneumatically.
In operation, a solid particulate or shredded fuel material is conveyed onto the upper surface of the inlet end portion 24A of the conveyor 24, via the discharge chute 26.
The material traverses the length of the conveyor 24 before falling off the discharge end 24B by gravity. The fuel material then passes through the inlet opening 14a of thechamber 14 where it accumulates in the space between the valve 30. and the end portion 22A of the seal plug unit 22.
A level limit switch or metering device (not shown) associated w.ith the conveyor belt 24, or the chute 26, pro~
vides a signal when a predetermined amount o fuel material has accumulated for actuating the seal plug unit 22. This causes the unit 22 to traverse the runway 18 in a direction from right-to-left as viewed in the drawing~ whereby it pushes the amount of fuel material accumulating in the chamber 14 towards the discharge opening 14B. The seal plug unit 22 continues movement until it spans the opening 14A, after which time the limit switch 40 actuates the valve 30 to its open position shown by the dashed lines. This enables the metered amount of fuel material to discharge by ~6~
gravity into the hopper 36. The conveyor belt 34 then tran~ers the metered amount of fuel in the hopper 36 to the chute 38 from which it i~ introduced to the furnace.
The seal plug unit 22 continues its forward movement until its forward end extend~ a short dista~ce past the discharge spening 14B at which time the second limit ~witch 42 terminate~ further movement of the unit in the forward direction, init.iates a slight pause, and then rever~e~ move-ment of the unit towards its inactive position. During thi~
return movement the limit switch 40 initiate~ closi~g of the valve 30 when the unit spans the opening 14A, and the li~it swit~h 44 stopQ the reverse movement and transfers the operation back to the level limit or metering ~witche~. It is understood that the entire circ~litry just described ca~
be incorporated and sequenced into a fuel feed systP~ and boiler master control to further control the operation of the system of the present invention in accordance with ~uel supply and demand needs.
A~ the plug unit 22 travels by and spans the i~let opening 14A it achieves a positive seal between the atmosphere a~d the hopper 36 to prevent the introduction o~
at~ospheric air, i.e. tramp air, into the latter hopper.
Also, by virtue of ~he syst~m of the pre~ent invention, a precise amount of fuel material i~ metered from the chute 26 /
t, ~269~
to the hopper 36 and, from the latter, to the discharge chute 38. Also, in the movement of the seal plug unit 22, thç discharge gate is opened and closed while the unit 22 is spanning the opening 14a to ensu~e continuity of the afore-mentioned seal.
It is thu~ seen that the fuel transfer and Yeal 5ys~mof the present invention provides an efi~ient and simple operation at a relatively low co~t while achievin~ the aforementioned advantages.
A latitude of modification, change and ~ub~titution i9 intended in the foregoing disclosure and in ~ome ins~a~s some features o the i~vention will be employ~d wi~hout.a corresponding use of other fea~ure-~ Accordi~gly, it i~
appxopriat~ that the appended claims be con~trued broædly and in a manner consistent with thç spirit and ~cope o~ ~he invention herein.
Claims
1. A solid fuel transfer and seal system comprising a source of solid fuel material; a seal chamber having an inlet opening for receiving said fuel material and a discharge opening disposed at one end of said chamber; conveyor means for receiving said fuel material from said source and discharging said fuel material to said inlet opening; valve means for opening and closing said discharge opening;
a seal plug unit disposed in a resting position at the other end of said chamber and defining a wall of said chamber, said seal plug unit being movable across said chamber to push towards said discharge end all of the fuel material contained in said chamber between said inlet opening, said discharge opening and said seal plug unit; means responsive to a predetermined amount of movement of said seal plug unit towards said discharge opening for opening said valve means; a surface of said seal plug unlit extending immediately adjacent to and spanning said inlet opening to seal said inlet opening from said discharge opening during and after opening of said valve means; means responsive to said seal plug unit reaching said discharge end for reversing the movement of said seal plug unit away from said discharge end and towards said resting position; means responsive to a predetermined amount of movement of said seal plug unit towards said resting position for closing said valve means;
said seal plug unit sealing said inlet opening until said valve means is closed; means for forming a hopper communicating with said discharge opening; and conveyor means for transferring said fuel material from said hopper means to a discharge chute.
a seal plug unit disposed in a resting position at the other end of said chamber and defining a wall of said chamber, said seal plug unit being movable across said chamber to push towards said discharge end all of the fuel material contained in said chamber between said inlet opening, said discharge opening and said seal plug unit; means responsive to a predetermined amount of movement of said seal plug unit towards said discharge opening for opening said valve means; a surface of said seal plug unlit extending immediately adjacent to and spanning said inlet opening to seal said inlet opening from said discharge opening during and after opening of said valve means; means responsive to said seal plug unit reaching said discharge end for reversing the movement of said seal plug unit away from said discharge end and towards said resting position; means responsive to a predetermined amount of movement of said seal plug unit towards said resting position for closing said valve means;
said seal plug unit sealing said inlet opening until said valve means is closed; means for forming a hopper communicating with said discharge opening; and conveyor means for transferring said fuel material from said hopper means to a discharge chute.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US71065485A | 1985-03-11 | 1985-03-11 | |
| US710,654 | 1985-03-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1269891A true CA1269891A (en) | 1990-06-05 |
Family
ID=24854971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000500686A Expired - Fee Related CA1269891A (en) | 1985-03-11 | 1986-01-30 | Solid fuel transfer and seal system |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS61246517A (en) |
| CA (1) | CA1269891A (en) |
| ES (1) | ES8701668A1 (en) |
| GB (1) | GB2172272B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19834294A1 (en) * | 1998-07-29 | 2000-02-10 | Martin Umwelt & Energietech | Loading device |
| CN102192522B (en) * | 2011-06-30 | 2012-10-10 | 国电龙源电力技术工程有限责任公司 | Biomass boiler whole-pack feeding device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB309745A (en) * | 1928-04-26 | 1929-04-18 | Stanley Burrows | An improved pump |
| DE2701336C2 (en) * | 1977-01-14 | 1978-12-21 | Lindemann Maschinenfabrik Gmbh, 4000 Duesseldorf | Bunker closure |
| US4384659A (en) * | 1978-04-24 | 1983-05-24 | Richards John A | Apparatus and method for pumping powdered material |
| JPS6023716A (en) * | 1983-07-19 | 1985-02-06 | Shinagawa Fuaanesu Kk | Feeder for substance to be incinerated for incinerating furnace |
-
1986
- 1986-01-30 CA CA000500686A patent/CA1269891A/en not_active Expired - Fee Related
- 1986-02-20 JP JP61036459A patent/JPS61246517A/en active Granted
- 1986-03-06 ES ES552742A patent/ES8701668A1/en not_active Expired
- 1986-03-10 GB GB08605796A patent/GB2172272B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB8605796D0 (en) | 1986-04-16 |
| JPH0240931B2 (en) | 1990-09-13 |
| JPS61246517A (en) | 1986-11-01 |
| ES8701668A1 (en) | 1986-12-01 |
| ES552742A0 (en) | 1986-12-01 |
| GB2172272A (en) | 1986-09-17 |
| GB2172272B (en) | 1988-09-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |