CA1223774A - Arrangement for introducing coal into a combustion chamber under elevated pressure - Google Patents
Arrangement for introducing coal into a combustion chamber under elevated pressureInfo
- Publication number
- CA1223774A CA1223774A CA000421557A CA421557A CA1223774A CA 1223774 A CA1223774 A CA 1223774A CA 000421557 A CA000421557 A CA 000421557A CA 421557 A CA421557 A CA 421557A CA 1223774 A CA1223774 A CA 1223774A
- Authority
- CA
- Canada
- Prior art keywords
- bin
- coal
- mill
- inlet
- combustion chamber
- 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
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
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0003—Heating elements or systems with particulate fuel, e.g. aspects relating to the feeding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
- F27B15/003—Cyclones or chain of cyclones
-
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/10—Charging directly from hoppers or shoots
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Dispersion Chemistry (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Gasification And Melting Of Waste (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
ABSTRACT
Apparatus for feeding a combustion chamber under elevated pressure comprises first and second serially connected bins, each having an inlet through which raw coal may be supplied and an outlet through which the coal leaves the bin. The outlet from the first bin (relative to the flow direction of the raw coal) supplies raw coal to the inlet of the second bin. A mill for processing the raw coal is provided, such mill having an inlet connected to the outlet from the second bin and the mill being adapted to pulverize the raw coal to fines or dust according to the requirements of the combustion chamber. A
further inlet to the mill is provided for supplying a carrier gas for the pulverized coal and outlet means are provided on the mill for expelling the pulverized coal and carrier gas mixture from the mill. Conduit means are provided for conveying the mixture under pressure to the combustion chamber.
The inlet of each bin is provided with a pressure-tight shut-off member and the first bin is provided with a vent pipe having a shut-off valve therein. The invention eliminates the need for an intermediate storage facility between the mill and the combustion chamber and the pulverized coal may be fed directly from the mill to the combustion chamber under elevated pressure.
Apparatus for feeding a combustion chamber under elevated pressure comprises first and second serially connected bins, each having an inlet through which raw coal may be supplied and an outlet through which the coal leaves the bin. The outlet from the first bin (relative to the flow direction of the raw coal) supplies raw coal to the inlet of the second bin. A mill for processing the raw coal is provided, such mill having an inlet connected to the outlet from the second bin and the mill being adapted to pulverize the raw coal to fines or dust according to the requirements of the combustion chamber. A
further inlet to the mill is provided for supplying a carrier gas for the pulverized coal and outlet means are provided on the mill for expelling the pulverized coal and carrier gas mixture from the mill. Conduit means are provided for conveying the mixture under pressure to the combustion chamber.
The inlet of each bin is provided with a pressure-tight shut-off member and the first bin is provided with a vent pipe having a shut-off valve therein. The invention eliminates the need for an intermediate storage facility between the mill and the combustion chamber and the pulverized coal may be fed directly from the mill to the combustion chamber under elevated pressure.
Description
3~
This invention relates to apparatus for introducing pulver~zed coal into a combu~tion chamber under elevated pressure9 in which the coal is pulverized in a m~ll provided wlth a supply of raw coal and conveyed therefrom by means of a carrier gas.
Conventionally, the mill wherein the coal is dried and pulverized is effectively separated from the combustion chamber because of the dlfficulties in controlling the pressure and sealing the system from the atmosphere. This problem i6 not as acute in low-pressure systems, wherein the combustion chamber pressure can be maintained by the simple expedien~ of a column of coal or the maintenance of a minimum level in the raw coal supply bin, which effectively seals the system from the atmosphere, but higher pressures cannot be effectively controlled by these simple expedients. Thus, the conventional practice is to feed the pulverized coal or coal dust into a cyclone, wherein lt is separated from the carrier gas and to thereafter store the dust in a bin.
It ts then conveyed by means of a pressurized conveyor system from the bln to the combustion chamber, the coal dust passing through a sluice system in order to enable a continuous pressure conveyance.
The indirect introduction of the coal dust by such means as are described above increases the expense and complexity of the plant. It is therefore a desirable ob~ect to eliminate the need for an intermediate storage facility between the mill and the combustion chamber and to provide means whereby the pulverized coal may be fed directly from the mill to the combustion chamber under elevated pressure.
According to the present invention, apparatus for feeding a combustion chamber under eleva~ed pressure comprises first and second serially connected bins, each having an inlet through which raw coal may be supplied and an outlet thro~gh wllich said coal leaves said bin, the outlet from the first bin supplying raw coal to the inlet of the second bin, a mill for processing the a~37~
raw coal, said mill having an inlet connected to the outlet from the second bin and the mill being adapted to pulverize the raw coal, a further inlet to said mill for supplying a carrier gas for the pulverized coal and outlet means on said mill for expelling the pulverized coal and carrier gas mixture from the mill and conduit means for conveying the mixture under pressure to said combustion chamber. The inlet of each bin is provided with a pressure-tlght shu~-off member and, in the flow direction of the raw coal, the first bin is provided with a shut-off vent pipe. Thus, the intermediate bins provided wlth the shut-off members enable a pressure sealing of the system and since the intermediate bins are located in the raw coal supply path rather than the pulverized coal supply for the combustion chamber, the pulverized coal can be blown directly from the mill into the combustion chamber.
Preferably, an intermediate conveyor is located between the outlet of the first bin and the pressure sealing shut-off valve for the second bin, whereby any raw coal in the exit o~ the first bin rests on the intermediate conveyor when the shut-off valve ls closed, rather than on the valve it~elf.
Since the preferred form of valve i3 a slide-valve, this expedient eliminates the problems of the slider cutting through the column of coal in the pipe and being loaded by the coal once the slider is in its closed position.
The invention will now be described further by way of example only and with reference to the single figure of the accompanying drawings which schematically illustrates apparatus according to a preferred embodim nt of the present invention. The pulverized coal is in the form of dust or fines of a size determined by the requirements of the combustion chamber and the mill construction~ For the sake of convenience, the invention will hereinafter be described with reference to a duat-flred combustion chamber.
Referring to the drawing, raw coal is supplied from a storage bin l in predetermined quantity by means of a conveyor 2. Lime or limestone from a ~2377~
bin 3 i8 admixed with the raw coal on the conveyor 2 by means of a further conveyor 24. Shut-off alide-valves 4 are provided beneath the storag~ bin 1 and the lime bin 3.
The raw ~oal and lime mixture is supplied to a mill 5 by means of a slulce system, whlch will hereinafter be described in more detail. The coal and lime mixture is conveyed from the conveyor 2 t~D tha entry to the slulce system by means of a further conveyor 6, ~hich - as wlll be seen from the drawing - i8 incllned upwardly at a steep angle to bring the mi~ture from the relatively low level at which it exits the conveyor 2 to the relatively high level at which it i8 introduced into the sluice Ry3tem. Naturally, the preci~e angle and orientation of the conveyor 6 is entirely dependent upon the relative positions of the conveyor 2 and the slulce system.
Turnlng to the mill 5, there will be seen an inlet pipe 7 for raw coal emerglng from the sluice system and a feed pipe for a carrier gas (preferably air). This gas ls conveyed through the feed pipe by meana of a blower 8 and a heater is provided in the form of a heat exchanger 9 for heatlng the ga3, before in~ection into the mill 5. It may be noted that heated flue gases may also he introduced as the carrier gas into the mill 5 - either alone or together with airO
The coal ls pulverized in the mill and i8 dried by contact with the heated alr or flue gases. One or more conduits 10 convey the dust/gas mixture from the mill to the com~ustion chamber 11.
The combuition chamber may be that of a coal dust-fired furnace or a fluidized bed furnace or the reactlon chamber of a coal gasifler or bl~st furnace. The combustlon chamber is under an elev~ted pressure of, for e~ample, 40 milllbar~ or a superpressure of, for example, 20 bars.
Slnce the mill is subJected to the same pressure as the combu~tion chamber 11, the system comprlsing the mlll and the combustion chamber must be ~2~37~
sealed from the atmosphereO This i8 the primary purpose of the slulce system ~hich is provided bet~een the raw coal supply and the mlll and which will now be described in greater detall, The sluice system comprise~ tw~ closed intermediate bln~ 12 and 13 whlch are arranged in series, wlth the volume of the first bin 12 being g~eater than that of the downstream second bin 13. The bin~ 12 and 13 are each provided with an inlet pipe 14 and a discharge pipe lS and in each of the inlet pipes 14, a pressure sealing shut-off member 18 provided, which consists of a flap or slider 16 or 17 (preferably a sllde-valve). The fir~t itltermediate bin 12 is also provided wlth a vent pipe 18 having a shut-off valve therein and is connected by means of a line 19 to the downstream second intermediate bin 13, ~he llne 19 also having a shut-off valve therein to ~evere the communication between the two bins. Coal exiting from the second bln 13 18 conveyed by means of a discharge member 20 to the inlet 7 of the mlll 5 80 that the mill is continuously supplied with raw coal ln a predetermined quantity.
In the outlet pipes 15 of the flr~t and second bins 12 and 13, there are provided sllders 4, by which the flow of coal from each bln may be interrupted (for example, to enable repairs to be effected).
An intermediate conveyor 21 is located between the discharge pipe 15 of the first intermediate bln 12 and the inlet pipe 14 of the second lntermediate bin 13, above the pressure sealing shut-off slide valve 17. Thus, the bulk pile of raw coal present ln the bin 12 rests on the conveyor 21 and the conveyor i8 arranged to operate only when the slider 17 of the second bin 13 i8 open. When it is desired to clo~e the slider 17 at the outlet of the second bln }3, the conveyor 21 i8 stopped before closing of the sllder ~o that coal can empty from the inlet pipe to the bln 13 slnce the presence o~ coal would tend to impede closing of the slider 17. Al~o, this precaueion enaures that the slider ln lts closed posi~lon i8 not loaded with coal ln the pipe. A
~12~3~4 Rimilar function 19 perfor~ed by the conveyor 6 or, in its absence, the lateral conveyor 2 insofar a6 the slider 16 of the fir~t intermediate bin 12 i~
concerned.
Since there is a danger of self-ignition of }aw coal havlng low water content and a relatlvely high level of fines, it 1~3 preferred that the intermediate bins 12 and 13 be charged wlth inert gas in order to counterac~
this danger. For this purpose, an lnert gas conduLt 22 is pro~ided, which iB
connected by means of branch conduits 23 to the blns 12 and 13, the lnert gas being under pressure which i8 hlgher than that of the eombustlon chamber 11.
The condults 23 are provided with shut-off valves~ Processed flue gas from the combustion cha~ber can be used as the inert gas, if desired.
The sluice system operate~ ln the following manner. By vlrtue of the shut-off sliders 16 and 17, the compensation line 19 and the vent pipe 18, the second intermediate bln 13 may be permanently maintained under elevated pre~sure whil~t the flrst bin 12 may selectively be placed under eLevated pressure or atmospherlc pressure. The first bin 12 is charged wlth the raw coal and lime mixture when the slider 16 and the shut-off valve ln the vent pipe 18 are in thelr open positions. At this time, the sllder 17 of the second bin 13 and the shut-off member in the compensation line 19 are closed and the intermediate conveyor 21 is inoperatlve. Also at thts time, the coal mixture ln the bin 13 i~ conveyed to the mill 5 via the charging member 20. The conveyors; 2, 24 and 6 are then stopped and the slider 16 on the bin 12 and al80 the shut-off valve in the vent pipe 18 are clo~ed. Simultaneou~ly, the slider 17 of the second bin 13 and the ~hut-off valve in the line 19 are opened and the intermediate conveyor 21 18 set in motion in order to convey the coal from the bln 12 to the bln 13 without lnterrupting the raw coal ~upply to ehe mill 5. Thu~, the bin 12 i8 filled and emptied in a sequential fashion by manlpula~ion of the varlous pre~ure-seallng ~hut-off sliders coupled wlth 7~
operation of the various conveyors, whilst emptying of the bin 13 onto the charging member 20 to the mill 5 proceeds in continuous and interrupted fashionO By this arrangement, the pressure existing in the mill may be maintained, slnce the bin 13 i~ alway~ under pre~ure, whllst the coal flowa from the bin 13 to the mill without interruption.
Other ~odifications and embodiments will be apparent t~ those ~killed in the art without departing rom the ~pirit and 8cope of the inventlon as hereinbefore described and defined by the appended claim~.
This invention relates to apparatus for introducing pulver~zed coal into a combu~tion chamber under elevated pressure9 in which the coal is pulverized in a m~ll provided wlth a supply of raw coal and conveyed therefrom by means of a carrier gas.
Conventionally, the mill wherein the coal is dried and pulverized is effectively separated from the combustion chamber because of the dlfficulties in controlling the pressure and sealing the system from the atmosphere. This problem i6 not as acute in low-pressure systems, wherein the combustion chamber pressure can be maintained by the simple expedien~ of a column of coal or the maintenance of a minimum level in the raw coal supply bin, which effectively seals the system from the atmosphere, but higher pressures cannot be effectively controlled by these simple expedients. Thus, the conventional practice is to feed the pulverized coal or coal dust into a cyclone, wherein lt is separated from the carrier gas and to thereafter store the dust in a bin.
It ts then conveyed by means of a pressurized conveyor system from the bln to the combustion chamber, the coal dust passing through a sluice system in order to enable a continuous pressure conveyance.
The indirect introduction of the coal dust by such means as are described above increases the expense and complexity of the plant. It is therefore a desirable ob~ect to eliminate the need for an intermediate storage facility between the mill and the combustion chamber and to provide means whereby the pulverized coal may be fed directly from the mill to the combustion chamber under elevated pressure.
According to the present invention, apparatus for feeding a combustion chamber under eleva~ed pressure comprises first and second serially connected bins, each having an inlet through which raw coal may be supplied and an outlet thro~gh wllich said coal leaves said bin, the outlet from the first bin supplying raw coal to the inlet of the second bin, a mill for processing the a~37~
raw coal, said mill having an inlet connected to the outlet from the second bin and the mill being adapted to pulverize the raw coal, a further inlet to said mill for supplying a carrier gas for the pulverized coal and outlet means on said mill for expelling the pulverized coal and carrier gas mixture from the mill and conduit means for conveying the mixture under pressure to said combustion chamber. The inlet of each bin is provided with a pressure-tlght shu~-off member and, in the flow direction of the raw coal, the first bin is provided with a shut-off vent pipe. Thus, the intermediate bins provided wlth the shut-off members enable a pressure sealing of the system and since the intermediate bins are located in the raw coal supply path rather than the pulverized coal supply for the combustion chamber, the pulverized coal can be blown directly from the mill into the combustion chamber.
Preferably, an intermediate conveyor is located between the outlet of the first bin and the pressure sealing shut-off valve for the second bin, whereby any raw coal in the exit o~ the first bin rests on the intermediate conveyor when the shut-off valve ls closed, rather than on the valve it~elf.
Since the preferred form of valve i3 a slide-valve, this expedient eliminates the problems of the slider cutting through the column of coal in the pipe and being loaded by the coal once the slider is in its closed position.
The invention will now be described further by way of example only and with reference to the single figure of the accompanying drawings which schematically illustrates apparatus according to a preferred embodim nt of the present invention. The pulverized coal is in the form of dust or fines of a size determined by the requirements of the combustion chamber and the mill construction~ For the sake of convenience, the invention will hereinafter be described with reference to a duat-flred combustion chamber.
Referring to the drawing, raw coal is supplied from a storage bin l in predetermined quantity by means of a conveyor 2. Lime or limestone from a ~2377~
bin 3 i8 admixed with the raw coal on the conveyor 2 by means of a further conveyor 24. Shut-off alide-valves 4 are provided beneath the storag~ bin 1 and the lime bin 3.
The raw ~oal and lime mixture is supplied to a mill 5 by means of a slulce system, whlch will hereinafter be described in more detail. The coal and lime mixture is conveyed from the conveyor 2 t~D tha entry to the slulce system by means of a further conveyor 6, ~hich - as wlll be seen from the drawing - i8 incllned upwardly at a steep angle to bring the mi~ture from the relatively low level at which it exits the conveyor 2 to the relatively high level at which it i8 introduced into the sluice Ry3tem. Naturally, the preci~e angle and orientation of the conveyor 6 is entirely dependent upon the relative positions of the conveyor 2 and the slulce system.
Turnlng to the mill 5, there will be seen an inlet pipe 7 for raw coal emerglng from the sluice system and a feed pipe for a carrier gas (preferably air). This gas ls conveyed through the feed pipe by meana of a blower 8 and a heater is provided in the form of a heat exchanger 9 for heatlng the ga3, before in~ection into the mill 5. It may be noted that heated flue gases may also he introduced as the carrier gas into the mill 5 - either alone or together with airO
The coal ls pulverized in the mill and i8 dried by contact with the heated alr or flue gases. One or more conduits 10 convey the dust/gas mixture from the mill to the com~ustion chamber 11.
The combuition chamber may be that of a coal dust-fired furnace or a fluidized bed furnace or the reactlon chamber of a coal gasifler or bl~st furnace. The combustlon chamber is under an elev~ted pressure of, for e~ample, 40 milllbar~ or a superpressure of, for example, 20 bars.
Slnce the mill is subJected to the same pressure as the combu~tion chamber 11, the system comprlsing the mlll and the combustion chamber must be ~2~37~
sealed from the atmosphereO This i8 the primary purpose of the slulce system ~hich is provided bet~een the raw coal supply and the mlll and which will now be described in greater detall, The sluice system comprise~ tw~ closed intermediate bln~ 12 and 13 whlch are arranged in series, wlth the volume of the first bin 12 being g~eater than that of the downstream second bin 13. The bin~ 12 and 13 are each provided with an inlet pipe 14 and a discharge pipe lS and in each of the inlet pipes 14, a pressure sealing shut-off member 18 provided, which consists of a flap or slider 16 or 17 (preferably a sllde-valve). The fir~t itltermediate bin 12 is also provided wlth a vent pipe 18 having a shut-off valve therein and is connected by means of a line 19 to the downstream second intermediate bin 13, ~he llne 19 also having a shut-off valve therein to ~evere the communication between the two bins. Coal exiting from the second bln 13 18 conveyed by means of a discharge member 20 to the inlet 7 of the mlll 5 80 that the mill is continuously supplied with raw coal ln a predetermined quantity.
In the outlet pipes 15 of the flr~t and second bins 12 and 13, there are provided sllders 4, by which the flow of coal from each bln may be interrupted (for example, to enable repairs to be effected).
An intermediate conveyor 21 is located between the discharge pipe 15 of the first intermediate bln 12 and the inlet pipe 14 of the second lntermediate bin 13, above the pressure sealing shut-off slide valve 17. Thus, the bulk pile of raw coal present ln the bin 12 rests on the conveyor 21 and the conveyor i8 arranged to operate only when the slider 17 of the second bin 13 i8 open. When it is desired to clo~e the slider 17 at the outlet of the second bln }3, the conveyor 21 i8 stopped before closing of the sllder ~o that coal can empty from the inlet pipe to the bln 13 slnce the presence o~ coal would tend to impede closing of the slider 17. Al~o, this precaueion enaures that the slider ln lts closed posi~lon i8 not loaded with coal ln the pipe. A
~12~3~4 Rimilar function 19 perfor~ed by the conveyor 6 or, in its absence, the lateral conveyor 2 insofar a6 the slider 16 of the fir~t intermediate bin 12 i~
concerned.
Since there is a danger of self-ignition of }aw coal havlng low water content and a relatlvely high level of fines, it 1~3 preferred that the intermediate bins 12 and 13 be charged wlth inert gas in order to counterac~
this danger. For this purpose, an lnert gas conduLt 22 is pro~ided, which iB
connected by means of branch conduits 23 to the blns 12 and 13, the lnert gas being under pressure which i8 hlgher than that of the eombustlon chamber 11.
The condults 23 are provided with shut-off valves~ Processed flue gas from the combustion cha~ber can be used as the inert gas, if desired.
The sluice system operate~ ln the following manner. By vlrtue of the shut-off sliders 16 and 17, the compensation line 19 and the vent pipe 18, the second intermediate bln 13 may be permanently maintained under elevated pre~sure whil~t the flrst bin 12 may selectively be placed under eLevated pressure or atmospherlc pressure. The first bin 12 is charged wlth the raw coal and lime mixture when the slider 16 and the shut-off valve ln the vent pipe 18 are in thelr open positions. At this time, the sllder 17 of the second bin 13 and the shut-off member in the compensation line 19 are closed and the intermediate conveyor 21 is inoperatlve. Also at thts time, the coal mixture ln the bin 13 i~ conveyed to the mill 5 via the charging member 20. The conveyors; 2, 24 and 6 are then stopped and the slider 16 on the bin 12 and al80 the shut-off valve in the vent pipe 18 are clo~ed. Simultaneou~ly, the slider 17 of the second bin 13 and the ~hut-off valve in the line 19 are opened and the intermediate conveyor 21 18 set in motion in order to convey the coal from the bln 12 to the bln 13 without lnterrupting the raw coal ~upply to ehe mill 5. Thu~, the bin 12 i8 filled and emptied in a sequential fashion by manlpula~ion of the varlous pre~ure-seallng ~hut-off sliders coupled wlth 7~
operation of the various conveyors, whilst emptying of the bin 13 onto the charging member 20 to the mill 5 proceeds in continuous and interrupted fashionO By this arrangement, the pressure existing in the mill may be maintained, slnce the bin 13 i~ alway~ under pre~ure, whllst the coal flowa from the bin 13 to the mill without interruption.
Other ~odifications and embodiments will be apparent t~ those ~killed in the art without departing rom the ~pirit and 8cope of the inventlon as hereinbefore described and defined by the appended claim~.
Claims (8)
IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Apparatus for feeding a combustion chamber under elevated pressure, said apparatus comprising first and second serially connected bins, each having an inlet through which raw coal may be supplied and an outlet through which said coal leaves said bin, the outlet from the first bin relative to the flow direction of the raw coal supplying raw coal to the inlet of the second bin;
a mill for processing the raw coal, said mill having an inlet connected to the outlet from the second bin and said mill being adapted to pulverize the raw coal to fines or dust according to the requirements of said combustion chamber; a further inlet to said mill for supplying a carrier gas for the pulverized coal and outlet means on said mill for expelling the pulverized coal and carrier gas mixture from the mill; and conduit means for conveying the mixture under pressure to said combustion chamber; the inlet of each bin being provided with a pressure-tight slide-valve member and the first bin being provided with a vent pipe having a shut-off valve therein.
a mill for processing the raw coal, said mill having an inlet connected to the outlet from the second bin and said mill being adapted to pulverize the raw coal to fines or dust according to the requirements of said combustion chamber; a further inlet to said mill for supplying a carrier gas for the pulverized coal and outlet means on said mill for expelling the pulverized coal and carrier gas mixture from the mill; and conduit means for conveying the mixture under pressure to said combustion chamber; the inlet of each bin being provided with a pressure-tight slide-valve member and the first bin being provided with a vent pipe having a shut-off valve therein.
2. Apparatus as claimed in claim 1, wherein intermediate conveyor means are provided in the coal flow path ahead of the respective said bin inlets and pressure-tight slide-valve members and means are provided to halt the motion of each said intermediate conveyor means before the immediately following slide-valve member is closed, in order to interrupt the feeding of coal to said slide-valve member and to allow coal within the bin inlet associated therewith to empty from said inlet and thus allow unimpeded opening and closing movement of said slide-valve member within said inlet.
3. Apparatus as claimed in claim 1, wherein said first and second bins are interconnected by means of a pressure compensation line having a shut-off valve therein.
4. Apparatus as claimed in claim 1, 2 or 3, wherein means are provided for introducing inert gas to each of said serially connected bins, said inert gas being at a pressure higher than the pressure in said combustion chamber.
5. Apparatus as claimed in claim 1, 2 or 3, wherein the volume of said first bin is greater than that of said second bin.
6. Apparatus for feeding a combustion chamber under elevated pressure, said apparatus comprising first and second serially connected bins, each having an inlet through which raw coal may be supplied and an outlet through which said coal leaves said bin, the outlet from the first bin relative to the flow direction of the raw coal supplying raw coal to the inlet of the second bin;
a mill for processing the raw coal, said mill having an inlet connected to the outlet from the second bin and said mill being adapted to pulverize the raw coal to fines or dust according to the requirements of said combustion chamber; a further inlet to said mill for supplying a carrier gas for the pulverized coal and outlet means on said mill for expelling the pulverized coal and carrier gas mixture from the mill; and conduit means for conveying the mixture under pressure to said combustion chamber; the inlet of each bin being provided with a pressure-tight slide-valve member and the first bin being provided with a vent pipe having a shut-off valve therein; intermediate conveyor means provided in the coal flow path ahead of the respective said bin inlets and pressure-tight slide-valve members; means for halting the motion of each said intermediate conveyor means before the immediately following slide-valve member is closed, in order to interrupt the feeding of coal to said slide-valve member and to allow coal within the bin inlet associated therewith to empty from said inlet and thus allow unimpeded opening and closing movement of said slide-valve member within said inlet; and a pressure compensation line having a shut-off valve therein, interconnecting said first and second bins.
a mill for processing the raw coal, said mill having an inlet connected to the outlet from the second bin and said mill being adapted to pulverize the raw coal to fines or dust according to the requirements of said combustion chamber; a further inlet to said mill for supplying a carrier gas for the pulverized coal and outlet means on said mill for expelling the pulverized coal and carrier gas mixture from the mill; and conduit means for conveying the mixture under pressure to said combustion chamber; the inlet of each bin being provided with a pressure-tight slide-valve member and the first bin being provided with a vent pipe having a shut-off valve therein; intermediate conveyor means provided in the coal flow path ahead of the respective said bin inlets and pressure-tight slide-valve members; means for halting the motion of each said intermediate conveyor means before the immediately following slide-valve member is closed, in order to interrupt the feeding of coal to said slide-valve member and to allow coal within the bin inlet associated therewith to empty from said inlet and thus allow unimpeded opening and closing movement of said slide-valve member within said inlet; and a pressure compensation line having a shut-off valve therein, interconnecting said first and second bins.
7. Apparatus as claimed in claim 6, wherein means are provided for introducing inert gas to each of said serially connected bins, said inert gas being at a pressure higher than the pressure in said combustion chamber.
8. Apparatus as claimed in claim 6 or claim 7, wherein the volume of said first bin is greater than that of said second bin.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19823205321 DE3205321A1 (en) | 1982-02-15 | 1982-02-15 | DEVICE FOR INPUTING COAL IN A COMBUSTION ROOM UNDER PRESSURIZED PRESSURE |
| DEP3205321.5 | 1982-02-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1223774A true CA1223774A (en) | 1987-07-07 |
Family
ID=6155746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000421557A Expired CA1223774A (en) | 1982-02-15 | 1983-02-14 | Arrangement for introducing coal into a combustion chamber under elevated pressure |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0086260B1 (en) |
| JP (1) | JPS58145816A (en) |
| AT (1) | ATE25551T1 (en) |
| AU (1) | AU554229B2 (en) |
| CA (1) | CA1223774A (en) |
| DE (2) | DE3205321A1 (en) |
| ZA (1) | ZA828682B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3347703A1 (en) * | 1983-12-31 | 1985-07-11 | Loesche GmbH, 4000 Düsseldorf | DEVICE AND METHOD USING AN AIRFLOW MILL FOR PRODUCING A HOMOGENEOUS MIXTURE FROM CARBON DUST AND LIME DUST OR DOLOMITE DUST |
| JPH0351632Y2 (en) * | 1985-04-05 | 1991-11-06 | ||
| DE4302637A1 (en) * | 1993-01-30 | 1994-08-04 | Babcock Energie Umwelt | Crude coal feeder to pressurised pulveriser |
| DE19843255A1 (en) | 1998-09-10 | 2000-03-16 | Ver Energiewerke Ag | Lignite power station pipe chain conveyer has collar seals fitted at intervals maintaining high pressure difference between furnace and ambient air |
| CN103162306B (en) * | 2011-12-14 | 2015-05-27 | 佛山市国保节能环保技术有限公司 | Coal powder long-range conveying and combustion system |
| CN109985717A (en) * | 2017-12-31 | 2019-07-09 | 北京蓝亚能源科技有限公司 | A kind of safety system of high-efficiency pulverized coal preparation process |
| RU197671U1 (en) * | 2020-02-26 | 2020-05-21 | Виктор Алексеевич Степаненко | Pulverized fuel plant |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3204942A (en) * | 1963-02-18 | 1965-09-07 | Babcock & Wilcox Co | Distributor for pneumatically transported particle-form material |
| NL295333A (en) * | 1962-08-11 | |||
| DE1188098B (en) * | 1962-10-24 | 1965-03-04 | Siderurgie Fse Inst Rech | Process for regulating the quantities when blowing powdery substances into the tuyeres of blast furnaces |
| US3306238A (en) * | 1965-05-20 | 1967-02-28 | Armco Steel Corp | Fuel injection system for blast furnaces |
-
1982
- 1982-02-15 DE DE19823205321 patent/DE3205321A1/en not_active Withdrawn
- 1982-11-12 DE DE8282110460T patent/DE3275481D1/en not_active Expired
- 1982-11-12 EP EP82110460A patent/EP0086260B1/en not_active Expired
- 1982-11-12 AT AT82110460T patent/ATE25551T1/en not_active IP Right Cessation
- 1982-11-25 ZA ZA828682A patent/ZA828682B/en unknown
- 1982-12-10 AU AU91409/82A patent/AU554229B2/en not_active Ceased
-
1983
- 1983-01-12 JP JP58003267A patent/JPS58145816A/en active Granted
- 1983-02-14 CA CA000421557A patent/CA1223774A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ZA828682B (en) | 1983-09-28 |
| DE3275481D1 (en) | 1987-04-02 |
| EP0086260B1 (en) | 1987-02-25 |
| AU9140982A (en) | 1983-08-25 |
| ATE25551T1 (en) | 1987-03-15 |
| DE3205321A1 (en) | 1983-08-18 |
| EP0086260A3 (en) | 1984-05-30 |
| AU554229B2 (en) | 1986-08-14 |
| EP0086260A2 (en) | 1983-08-24 |
| JPS58145816A (en) | 1983-08-31 |
| JPH0225089B2 (en) | 1990-05-31 |
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