CA1199231A - Apparatus and method for feeding combustible dust material to a dust burner - Google Patents
Apparatus and method for feeding combustible dust material to a dust burnerInfo
- Publication number
- CA1199231A CA1199231A CA000402249A CA402249A CA1199231A CA 1199231 A CA1199231 A CA 1199231A CA 000402249 A CA000402249 A CA 000402249A CA 402249 A CA402249 A CA 402249A CA 1199231 A CA1199231 A CA 1199231A
- Authority
- CA
- Canada
- Prior art keywords
- air
- discharge
- dust
- settling
- 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
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Air Transport Of Granular Materials (AREA)
- Refuse Collection And Transfer (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A settling and discharge chamber is disposed below the supply tank to settle out the fluidizing air passing up-wardly from the fluidizing chamber. An air discharge line is also connected with the settling and discharge chamber to releive any over pressure. The air within the supply tank remains substantially stagnant and reduces the risk of self-ignition of the powdered fuel.
A settling and discharge chamber is disposed below the supply tank to settle out the fluidizing air passing up-wardly from the fluidizing chamber. An air discharge line is also connected with the settling and discharge chamber to releive any over pressure. The air within the supply tank remains substantially stagnant and reduces the risk of self-ignition of the powdered fuel.
Description
2~
APPARATUS AND METHOD FOR FE'EDING COMBUSTIBLE
DUST M~TERIAL TO A DUST BU~NER
This invention relates to an appara~us and method for feeding combustible dust material to a dust burner.
Heretofore, varioUs types of systems ha~e been known for feeding ~ossile fuel powders, such as lîgnite and bituminous coal dust and mixtures thereof to a dust burner. In many cases, the dust material is conveyed pneumatically from a storage point ~o the burner. For this purpose 9 various ~ypes of devices have been used. For example, ~s described in German 0.5~ 27 28 386, one known device employs a ro~atable disc which is provided with a plurality of passage holes for receiving charges of the fluidized fuel. During rotation of ~he disc~ the ~assage hol~s into which the fluidized mixture is charged are brought into coaxial position with ~ pneumatic transport stream. In ~his process, the mixture within the passage holes is taken along by the transport stream and fed to the burner. It has also been known to arrange ~uch a device downstream of a supply tank in which ~he ~u~l is irst fluidized and then fed to the devic~ for dosed transfer into th~ transport ~tream to the burner.
~owever, it has been ~ound tha~ ~here are certain risks involved in stoxing lignite and bituminous cs 1 powder ~ 2--or dust and mixtures thereo~ in a supply tank wherein there is a substantially c~n~i.nuous feeding in of a considerable amount of fresh air, especially of the fluidizing air, in ~he supply tank and ~he device for transferring the powder into the pne~matic transport stream. That is, there is a considerable risk that the powdered or dust ma~erial m~y self-ignite.
It has also been known, as describe~ in French Patent 365jO9~ to feed fluidized vegatable fuels, especially moist ~aw dust, to a burner from a supply tank vi~ a worm. HPWeVer, self-ignition of the moist saw dust is not pr~cluded. Furthex, the fluidizing air which is a~ a slight overpre6sure is not prevented from passing to~the supply of fuel.
While it is known to inhibite self-ignition of many materials by feeding an inert gas to the supply tank or to khe transport lines of the materials, such techni~ues not only necessitate constant availability of the inert gas itself but also feed lines for the gas and, in particular, sealing means to prevent access of foreign gases to the inert gas.
Accordingly, it i~ an object of the invention to reduce the risk o~ sel~-ignition in combustible dust materials supplied to a dust burner from a storage tank.
It is another ob~ect of the invention to increase the s~orage safety of a coal powder and its mixture in a suppl~
tank in a simple manner.
It is another object of the inventlon to increase the s~orage safe~y of a co~bus~ible dust material wi~hout adversely influencing the ~eeding ~f ~h~ material ~ a burner.
I~ is an~ther ob~ect o the lnvention to eliminate .
APPARATUS AND METHOD FOR FE'EDING COMBUSTIBLE
DUST M~TERIAL TO A DUST BU~NER
This invention relates to an appara~us and method for feeding combustible dust material to a dust burner.
Heretofore, varioUs types of systems ha~e been known for feeding ~ossile fuel powders, such as lîgnite and bituminous coal dust and mixtures thereof to a dust burner. In many cases, the dust material is conveyed pneumatically from a storage point ~o the burner. For this purpose 9 various ~ypes of devices have been used. For example, ~s described in German 0.5~ 27 28 386, one known device employs a ro~atable disc which is provided with a plurality of passage holes for receiving charges of the fluidized fuel. During rotation of ~he disc~ the ~assage hol~s into which the fluidized mixture is charged are brought into coaxial position with ~ pneumatic transport stream. In ~his process, the mixture within the passage holes is taken along by the transport stream and fed to the burner. It has also been known to arrange ~uch a device downstream of a supply tank in which ~he ~u~l is irst fluidized and then fed to the devic~ for dosed transfer into th~ transport ~tream to the burner.
~owever, it has been ~ound tha~ ~here are certain risks involved in stoxing lignite and bituminous cs 1 powder ~ 2--or dust and mixtures thereo~ in a supply tank wherein there is a substantially c~n~i.nuous feeding in of a considerable amount of fresh air, especially of the fluidizing air, in ~he supply tank and ~he device for transferring the powder into the pne~matic transport stream. That is, there is a considerable risk that the powdered or dust ma~erial m~y self-ignite.
It has also been known, as describe~ in French Patent 365jO9~ to feed fluidized vegatable fuels, especially moist ~aw dust, to a burner from a supply tank vi~ a worm. HPWeVer, self-ignition of the moist saw dust is not pr~cluded. Furthex, the fluidizing air which is a~ a slight overpre6sure is not prevented from passing to~the supply of fuel.
While it is known to inhibite self-ignition of many materials by feeding an inert gas to the supply tank or to khe transport lines of the materials, such techni~ues not only necessitate constant availability of the inert gas itself but also feed lines for the gas and, in particular, sealing means to prevent access of foreign gases to the inert gas.
Accordingly, it i~ an object of the invention to reduce the risk o~ sel~-ignition in combustible dust materials supplied to a dust burner from a storage tank.
It is another ob~ect of the invention to increase the s~orage safety of a coal powder and its mixture in a suppl~
tank in a simple manner.
It is another object of the inventlon to increase the s~orage safe~y of a co~bus~ible dust material wi~hout adversely influencing the ~eeding ~f ~h~ material ~ a burner.
I~ is an~ther ob~ect o the lnvention to eliminate .
3--the need to provide a means for suppl~ing inert air or gas to a ~ystem for ~eediny combustible ~ust matexials to a burner.
Briefly, khe in~ention provides an apparatus for feeding combust~ble dust material to a dus~ burner which is compxised of a supply tank, an air se~tling ~nd discharge chamber an air di~chaxge line and means for E~neumatically transpsrting chaxges o~ ~he dust material ~o the dust burner. The supply tank serves to store the combustible material and is pro~vided with a filling opening for charging of the tank and a discharge 1~ openin~ for discharging the material. The settling and discharge chamber receives the dust material from the discharge opening while the air discharge line communicates with *he discharge chamber to exhaust air therefrom. The pneumatic means i~
situated below the settling and dischar~e chamber in ordex to pneumatically transpor~ charge~ of the dust material to the dust burner.
The tank may also be provided with a vibrator di~charge means at the discharge opening for discharging dust material unifoxmly through the discharge opening. In additivn, a fluidizing chamber is positioned ~elvw the settling and discharge chamber for receiving and fluidizing ~he dust material~
The invention also provides a method of feeding combustible dust material to a ~urner. This me~hod includes the StQps of storing a supply of combustible dust material in a 5uppl~ tank and o~ di~harging the material ~rom the tank into and ~hrough an air sektling and discharge chamber main~ained a~
a pressure ~ubstantially e~ual to the air pressure in the supply tank, Therea~kex, ~he dus~ ma~er~al is ~luidized ~ownstxeam o~
the set~ling and discharye chamber and charges of the fluidized material are ~ransporte~ into a pneumatic ~ranspor~ ~tream for delivery t~ the dust burner.
In acoordance with the invention it is considered 5 that atmospheric air which has penetra~ed from absve into the supply tank durin~ filling of ~he tank ~ecomes inert in a short time if the air col~mn above the fuel column is sta~nant and no additional quantity of new air (oxygen) is fed there-from to the powdered fuel in the supply tank~ This holds true even if ~he ~upply tank is open a~ ~he filling opening or is povided with a valve which only takes caxe that, while the supply tank is ~eing emptied, no underpre~ure is generated therein.
The air settling and discharge chamber which is provided serves to stop a continuous feeding in of fresh fluidizing ~ir 15 from ~he pneumatic transporting means. Thus, air (oxygen~ is prevented frompassing from the pneumatic transporting means into an adjacent section of ~he supply tank. In ~his way, th~ air ~oxygen~ is prevented from penetratiny into the uel colu~
so that the danyer of smolderin~ and burning is reduced.
Of note, there is a slight overpressure in the air which passes ~rc: m the pneumatic transpor~ing means ~ However, this sïi~3ht overpressure i5 led off via the air discharye line.
E'urther, by ha~ing the air discharge lisle directed upwardl~
at an inclined ~ngle ~ the dust thak snay b~ taken along with the air i5 separa~ed in ~e manner e~f an air elutriator.
These and o~cher objec~s and advan~a~e~ o ~e inventiorl will becc~me m~r~3 apparent ~rom the ollowing detailed descrip~ion tak n ~n s:~on~un~tiorl wi~h ~he ac:compar~yi:ng ~rawings wherein:
3~
Fig. 1 illustrates a ~chematic ~iew of an apparakus constructed in ac~Qrdance with the invention;
Fig. 2 illustrates an enlarged view of the apparatus in paxt of Fig. l;
Fig. 3 illustrates a modified apparatus construc*ed in aceordance with ~he in~ention: ~nd Fig. 4 illustrates a further modified apparatus sonstruGted in a~cordance with the invention.
Re~erri.ng to ~ig. 1, the apparatus f~r feeding a combu~tible dust m~terial includes a supply tank 1 in which a combustible dust m~terial such as a powdered coal is stored.
A means 2 is pr~vided below ~he supply tank 1 for pneumaticall~
transporting ehaxges of the dust material, for example to a pneumatic eed line.
Referring to Fig. 2, the supply tank 1 has a filling openin~ 3 at the upper end through which the dust material is charged into the tank 1. This filling openin~ 3 may be provided with a closure or may be left wi~h~ut such a closure~ I~ a closure is used, a ~alve 4 is provided next to the opening 3 to admit only s~ much air to the supply tank 1 as fuel dust is delivered therefrom withc:ut generating an underpres~ure in the space 5 above the c~lumn St of fuel. In an~ case, the atmosphere in the space 5 above the fuel dus~ column St i5 se~tled and no 10w is generateh b tween the outside air above ~he ~ank 1 25 and the spac~ 5 ~n ~e tank 1. The air in the ~pace 5 can thus be called ~tagnan~
The supply tanlc 1 is also provided Wi~}l a ~unnel shaped lower sec~ion ïa whic}l terminates ~n a dischar~e opening. In 3 ~, ~ 'a additiorl, a vibra~or discharge means 6 is provided at ~he lower end of the tank 1~ This vibrator discharge means 6 is pro~ided wi~h a suitable mo~r 7 and serves ~o discharge the dust material uniformly downwardly fxom the tank 1.
An air settling and di$char~e chamber 8 is disposed below ~le vibratGr discharge means 6 in order to receive dust ~aterial from the discharge opening o~ the tank lo This settling and discharge chamber 8 may be o~ funnel-shape as indicated and is disposed direc~ly below the discharge opening of ~he tank 1- As indicated in Fig. 2, the funnel-shaped chamber 8 has a conical wall 9 o~er which the fuel dust may pass via a neck 10 lnto a worm conveyor 11. As indicated, the worm conveyor ~1 has a ~ro~t end 12 which extends into a section 13 of the pneumatic transporting means 2 in order to deliver dust material.
The pneumatic transportin~ means also has a fluidizing chamber 15 below the section 13 in order to fluidize the dust material delivered from the worm 11. As indicated in Fig~ 1, a ~luidizin~ line 14 opens into the cham~er 15 in order to ~eliver air thereto ~o fluidize the dust material delivered via the conveyor 11. In addition, a rotatabl~ disc 16 provided with passaye holes is disposed within the chamber 15 for dîspen-sing dosed charges of the dust material ~rom the chamber 15.
This di~c 16 is cons~ructed, for example, as descxibed in Germ~n O.S. 27 2~ 386. During rotation, ~he hole~ o the di~c move into a position which is axial with respect ~o a pair of ~ranspor~ s~ream lines 17, 17a ~hrough which a pneuma~ic txansport stream passes. The pneum~tic transp~rt stream causes the dust materlal to be b~own out o~ ~he respective holes o~ the disc 16 ~ s ~hown in Fig. 1, the fluidiæing line 14 and the transpor stream line 17 axe connected to a common air line 18. In add~tion, an intermediate blower 19 may optionally ~e provided in the line 17~ The transport stream line 17a leads, along with an air line 20, in~o a burner 21 of a heatin~
boiler 22 of a hot water heating plant 23.
Re~erring to ~igs~ 1 and 2~ an air dischargP li~e 24 communicates with the air settling and discha~ge.chamber 8 ~o e~haust air ~here~rom. ~s shown in ~ig. 8, the discharge line 24 leads to a filter 25, the lower section of which leads via a line 26 directly or indirectly into the ~illing opening 3 of the tanX 1~ In addition, a ~lower 27 is disposed upstream of the ilter 25 in ~he line 24 in order to create a slight suction for drawing off air from the settling an~l discharge chamber 8. In this way, a pressure can be maintained in the chamber ~ which is no ~reater than the air pressure in the tank 1.
Sometime after the coal dust is filled into the tank 1, the air in the space 5 is made inert. Likewise, the air which slowly follows a~ter ~ia the opening 3 or the valve 4 due to the removal o:E the dust from the ~ank 1 becomes inert in a short time~ The fluidizing air which emmenates ~xom the pneumatic ~ransporting means 2 is a~ a slight oYerpressure ts:~ which, in part, ~e pressure ~rom the ~ransport line 17 is added i:~ the dlsc 16 rotates in ~ront o~ tha lines 17,, 17a. ~lowever, this slight overprPssUre is xeduced by the air discharge line 24 and does not extend into the pile o~ coal dus~ in the tank 1. Further, ~he pressure wi~hin ~he air ~et~lin~ and di~char~e chamber 8 can l~e controlled and reduced by means o:E the blower 27 BO that no ~resh air can get in~o the pile of coal dust ~rom bel~w.
Referring to Fig. 3; wherein like reference chaxacters indicate like par~s as above, a plurality of baffle~ e 5 compt:?nents 28 may be provided in and under the settling and discharge chamber 8 in place of ~he wc)rm conveyor 11. These baffl e-like component~ 28 serve to settlP the fluidizing air which emerges upwardly xom the transporting means 2.and prevents the fluidizing air from the transporting means 2 fxom passing ~ia the vibrator means 6 into ~he dust column St of the supply tank. As i~dicated, the upper section ~f the fluidizing chamber has a conical part 29 wi~h~ a downwardly directed opening 30 while an upwardly directed mounting cone 31 is provîded above the p~rt ~9. The emerging flui.dizing air thus strikes the inside 32 of the coT71e 31 in the direction indicated by the arrows 33, i5 deflected downwardly in the direction indicated by the arxsws 34 and, in the process, takes along the dust sliding down on the conical part 29 without penetrating into the chamber ~ in larger amounts.
ZO As indicated in Fig. 3, the tank 1 may be closed off by means o~ a closure 35~ In additi~n, as an option, inert gas can be admitted vîa a line 36 into the supply tank 1 above the dust material column S~. This inert gas may be burnex gas which is cooled down in a heat exchanger or another waste gasO
To avoid clogging with coal dust~ the e~haus~ line 24 can be replaced by a dischaxge line 44 whi~h is directed upwardly at an inclined angle. The angle o inclinatic)n may be near or ~3:o~re ~he an5~1e of repo~e or slide s~f the coal dust. .
3~.
g Re~erring to Fig. 4, wherein like refererlce chara~ters indicate ~ ike par~.~ as above ~ ~e se~:~ling and discharge chamber 4 O may have an upper inle~ ! opening ~o the discharge opening of ~che supply tank 1 and a lower ou~le~ 41 opening the fluidizing cha~er via the con~reyor 11 as well as a c:entral portion which is of larger cross-sec~ion ~han the inlet 42 and outlet ~l. In this manner, ~e ~ettling of the air which is introduced intc) the chamber 40 c::an be further ~romoted.
The ~arious apparatus described above may be operated 10 on a continuous basis or an intermittent basis ~cs as to ~eed dust material to a burner.
Briefly, khe in~ention provides an apparatus for feeding combust~ble dust material to a dus~ burner which is compxised of a supply tank, an air se~tling ~nd discharge chamber an air di~chaxge line and means for E~neumatically transpsrting chaxges o~ ~he dust material ~o the dust burner. The supply tank serves to store the combustible material and is pro~vided with a filling opening for charging of the tank and a discharge 1~ openin~ for discharging the material. The settling and discharge chamber receives the dust material from the discharge opening while the air discharge line communicates with *he discharge chamber to exhaust air therefrom. The pneumatic means i~
situated below the settling and dischar~e chamber in ordex to pneumatically transpor~ charge~ of the dust material to the dust burner.
The tank may also be provided with a vibrator di~charge means at the discharge opening for discharging dust material unifoxmly through the discharge opening. In additivn, a fluidizing chamber is positioned ~elvw the settling and discharge chamber for receiving and fluidizing ~he dust material~
The invention also provides a method of feeding combustible dust material to a ~urner. This me~hod includes the StQps of storing a supply of combustible dust material in a 5uppl~ tank and o~ di~harging the material ~rom the tank into and ~hrough an air sektling and discharge chamber main~ained a~
a pressure ~ubstantially e~ual to the air pressure in the supply tank, Therea~kex, ~he dus~ ma~er~al is ~luidized ~ownstxeam o~
the set~ling and discharye chamber and charges of the fluidized material are ~ransporte~ into a pneumatic ~ranspor~ ~tream for delivery t~ the dust burner.
In acoordance with the invention it is considered 5 that atmospheric air which has penetra~ed from absve into the supply tank durin~ filling of ~he tank ~ecomes inert in a short time if the air col~mn above the fuel column is sta~nant and no additional quantity of new air (oxygen) is fed there-from to the powdered fuel in the supply tank~ This holds true even if ~he ~upply tank is open a~ ~he filling opening or is povided with a valve which only takes caxe that, while the supply tank is ~eing emptied, no underpre~ure is generated therein.
The air settling and discharge chamber which is provided serves to stop a continuous feeding in of fresh fluidizing ~ir 15 from ~he pneumatic transporting means. Thus, air (oxygen~ is prevented frompassing from the pneumatic transporting means into an adjacent section of ~he supply tank. In ~his way, th~ air ~oxygen~ is prevented from penetratiny into the uel colu~
so that the danyer of smolderin~ and burning is reduced.
Of note, there is a slight overpressure in the air which passes ~rc: m the pneumatic transpor~ing means ~ However, this sïi~3ht overpressure i5 led off via the air discharye line.
E'urther, by ha~ing the air discharge lisle directed upwardl~
at an inclined ~ngle ~ the dust thak snay b~ taken along with the air i5 separa~ed in ~e manner e~f an air elutriator.
These and o~cher objec~s and advan~a~e~ o ~e inventiorl will becc~me m~r~3 apparent ~rom the ollowing detailed descrip~ion tak n ~n s:~on~un~tiorl wi~h ~he ac:compar~yi:ng ~rawings wherein:
3~
Fig. 1 illustrates a ~chematic ~iew of an apparakus constructed in ac~Qrdance with the invention;
Fig. 2 illustrates an enlarged view of the apparatus in paxt of Fig. l;
Fig. 3 illustrates a modified apparatus construc*ed in aceordance with ~he in~ention: ~nd Fig. 4 illustrates a further modified apparatus sonstruGted in a~cordance with the invention.
Re~erri.ng to ~ig. 1, the apparatus f~r feeding a combu~tible dust m~terial includes a supply tank 1 in which a combustible dust m~terial such as a powdered coal is stored.
A means 2 is pr~vided below ~he supply tank 1 for pneumaticall~
transporting ehaxges of the dust material, for example to a pneumatic eed line.
Referring to Fig. 2, the supply tank 1 has a filling openin~ 3 at the upper end through which the dust material is charged into the tank 1. This filling openin~ 3 may be provided with a closure or may be left wi~h~ut such a closure~ I~ a closure is used, a ~alve 4 is provided next to the opening 3 to admit only s~ much air to the supply tank 1 as fuel dust is delivered therefrom withc:ut generating an underpres~ure in the space 5 above the c~lumn St of fuel. In an~ case, the atmosphere in the space 5 above the fuel dus~ column St i5 se~tled and no 10w is generateh b tween the outside air above ~he ~ank 1 25 and the spac~ 5 ~n ~e tank 1. The air in the ~pace 5 can thus be called ~tagnan~
The supply tanlc 1 is also provided Wi~}l a ~unnel shaped lower sec~ion ïa whic}l terminates ~n a dischar~e opening. In 3 ~, ~ 'a additiorl, a vibra~or discharge means 6 is provided at ~he lower end of the tank 1~ This vibrator discharge means 6 is pro~ided wi~h a suitable mo~r 7 and serves ~o discharge the dust material uniformly downwardly fxom the tank 1.
An air settling and di$char~e chamber 8 is disposed below ~le vibratGr discharge means 6 in order to receive dust ~aterial from the discharge opening o~ the tank lo This settling and discharge chamber 8 may be o~ funnel-shape as indicated and is disposed direc~ly below the discharge opening of ~he tank 1- As indicated in Fig. 2, the funnel-shaped chamber 8 has a conical wall 9 o~er which the fuel dust may pass via a neck 10 lnto a worm conveyor 11. As indicated, the worm conveyor ~1 has a ~ro~t end 12 which extends into a section 13 of the pneumatic transporting means 2 in order to deliver dust material.
The pneumatic transportin~ means also has a fluidizing chamber 15 below the section 13 in order to fluidize the dust material delivered from the worm 11. As indicated in Fig~ 1, a ~luidizin~ line 14 opens into the cham~er 15 in order to ~eliver air thereto ~o fluidize the dust material delivered via the conveyor 11. In addition, a rotatabl~ disc 16 provided with passaye holes is disposed within the chamber 15 for dîspen-sing dosed charges of the dust material ~rom the chamber 15.
This di~c 16 is cons~ructed, for example, as descxibed in Germ~n O.S. 27 2~ 386. During rotation, ~he hole~ o the di~c move into a position which is axial with respect ~o a pair of ~ranspor~ s~ream lines 17, 17a ~hrough which a pneuma~ic txansport stream passes. The pneum~tic transp~rt stream causes the dust materlal to be b~own out o~ ~he respective holes o~ the disc 16 ~ s ~hown in Fig. 1, the fluidiæing line 14 and the transpor stream line 17 axe connected to a common air line 18. In add~tion, an intermediate blower 19 may optionally ~e provided in the line 17~ The transport stream line 17a leads, along with an air line 20, in~o a burner 21 of a heatin~
boiler 22 of a hot water heating plant 23.
Re~erring to ~igs~ 1 and 2~ an air dischargP li~e 24 communicates with the air settling and discha~ge.chamber 8 ~o e~haust air ~here~rom. ~s shown in ~ig. 8, the discharge line 24 leads to a filter 25, the lower section of which leads via a line 26 directly or indirectly into the ~illing opening 3 of the tanX 1~ In addition, a ~lower 27 is disposed upstream of the ilter 25 in ~he line 24 in order to create a slight suction for drawing off air from the settling an~l discharge chamber 8. In this way, a pressure can be maintained in the chamber ~ which is no ~reater than the air pressure in the tank 1.
Sometime after the coal dust is filled into the tank 1, the air in the space 5 is made inert. Likewise, the air which slowly follows a~ter ~ia the opening 3 or the valve 4 due to the removal o:E the dust from the ~ank 1 becomes inert in a short time~ The fluidizing air which emmenates ~xom the pneumatic ~ransporting means 2 is a~ a slight oYerpressure ts:~ which, in part, ~e pressure ~rom the ~ransport line 17 is added i:~ the dlsc 16 rotates in ~ront o~ tha lines 17,, 17a. ~lowever, this slight overprPssUre is xeduced by the air discharge line 24 and does not extend into the pile o~ coal dus~ in the tank 1. Further, ~he pressure wi~hin ~he air ~et~lin~ and di~char~e chamber 8 can l~e controlled and reduced by means o:E the blower 27 BO that no ~resh air can get in~o the pile of coal dust ~rom bel~w.
Referring to Fig. 3; wherein like reference chaxacters indicate like par~s as above, a plurality of baffle~ e 5 compt:?nents 28 may be provided in and under the settling and discharge chamber 8 in place of ~he wc)rm conveyor 11. These baffl e-like component~ 28 serve to settlP the fluidizing air which emerges upwardly xom the transporting means 2.and prevents the fluidizing air from the transporting means 2 fxom passing ~ia the vibrator means 6 into ~he dust column St of the supply tank. As i~dicated, the upper section ~f the fluidizing chamber has a conical part 29 wi~h~ a downwardly directed opening 30 while an upwardly directed mounting cone 31 is provîded above the p~rt ~9. The emerging flui.dizing air thus strikes the inside 32 of the coT71e 31 in the direction indicated by the arrows 33, i5 deflected downwardly in the direction indicated by the arxsws 34 and, in the process, takes along the dust sliding down on the conical part 29 without penetrating into the chamber ~ in larger amounts.
ZO As indicated in Fig. 3, the tank 1 may be closed off by means o~ a closure 35~ In additi~n, as an option, inert gas can be admitted vîa a line 36 into the supply tank 1 above the dust material column S~. This inert gas may be burnex gas which is cooled down in a heat exchanger or another waste gasO
To avoid clogging with coal dust~ the e~haus~ line 24 can be replaced by a dischaxge line 44 whi~h is directed upwardly at an inclined angle. The angle o inclinatic)n may be near or ~3:o~re ~he an5~1e of repo~e or slide s~f the coal dust. .
3~.
g Re~erring to Fig. 4, wherein like refererlce chara~ters indicate ~ ike par~.~ as above ~ ~e se~:~ling and discharge chamber 4 O may have an upper inle~ ! opening ~o the discharge opening of ~che supply tank 1 and a lower ou~le~ 41 opening the fluidizing cha~er via the con~reyor 11 as well as a c:entral portion which is of larger cross-sec~ion ~han the inlet 42 and outlet ~l. In this manner, ~e ~ettling of the air which is introduced intc) the chamber 40 c::an be further ~romoted.
The ~arious apparatus described above may be operated 10 on a continuous basis or an intermittent basis ~cs as to ~eed dust material to a burner.
Claims (14)
1. An apparatus for feeding combustible dust material to a dust burner, said apparatus comprising a supply tank for storing combustible dust material, said tank having a filling opening for charging the dust material into said tank, a discharge opening in a lower end and a vibrator discharge means for discharging the dust material through said discharge opening;
an air settling and discharge chamber for receiving the dust material from said discharge opening;
an air discharge line communicating with said air settling and discharge chamber to exhaust air therefrom;
a fluidizing chamber below said settling and discharge chamber for fluidizing the dust material; and means for pneumatically transporting charges of the dust material from said fluidizing chamber.
an air settling and discharge chamber for receiving the dust material from said discharge opening;
an air discharge line communicating with said air settling and discharge chamber to exhaust air therefrom;
a fluidizing chamber below said settling and discharge chamber for fluidizing the dust material; and means for pneumatically transporting charges of the dust material from said fluidizing chamber.
2. An apparatus as set forth in claim 1 wherein said settling and discharge chamber has a funnel-shape and is disposed below said discharge opening.
3. An apparatus as set forth in claim 2 which further comprises a plurality of baffle-like components above said means to settle air emerging upwardly from said means.
4. An apparatus as set forth in claim 1 wherein said settling and discharge chamber has an upper inlet opening to said discharge opening and a central portion of larger cross-section than said inlet.
5. An apparatus as set forth in claim 1 wherein said settling and discharge chamber has a lower outlet opening to said fluidizing chamber and a central portion of larger cross-section than said outlet.
6. An apparatus as set forth in claim 1 wherein said air discharge line is directed upwardly at an inclined angle.
7. An apparatus for feeding combustible dust material to a dust burner, said apparatus comprising a supply tank for storing combustible material, said tank having a filling opening for charging of the material into said tank and a discharge opening for discharging the material;
an air settling and discharge chamber for receiving the dust material from said discharge opening;
an air discharge line communicating with said air settling and discharge chamber to exhaust air therefrom; and means below said chamber for pneumatically transporting charges of the dust material to the dust burner.
an air settling and discharge chamber for receiving the dust material from said discharge opening;
an air discharge line communicating with said air settling and discharge chamber to exhaust air therefrom; and means below said chamber for pneumatically transporting charges of the dust material to the dust burner.
8. An apparatus as set forth in claim 7 which further comprises a vibrator discharge means at said discharge opening for discharging dust material uniformly through said discharge opening.
9. An apparatus as set forth in claim 7 which further comprises a fluidizing chamber below said settling and discharge chamber for receiving and fluidizing the dust material.
10. An apparatus as set forth in claim 9 which further comprises a feed screw between said air settling and discharge chamber and said fluidizing chamber for conveying dust material therebetween.
11. An apparatus as set forth in claim 7 wherein said air discharge line is directed upwardly at an inclined angle.
12. A method of feeding combustible dust material to a burner comprising the steps of storing a supply of combustible dust material in a supply tank;
discharging the dust material from the tank into and through an air settling and discharge chamber maintained at a pressure substantially equal to the air pressure in the supply tank downstream of the settling and discharge chamber;
thereafter fluidizing the discharged dust material downstream of the settling and discharge chamber;
transporting charges of the fluidizing dust material into a pneumatic transport stream for delivery to a dust burner.
discharging the dust material from the tank into and through an air settling and discharge chamber maintained at a pressure substantially equal to the air pressure in the supply tank downstream of the settling and discharge chamber;
thereafter fluidizing the discharged dust material downstream of the settling and discharge chamber;
transporting charges of the fluidizing dust material into a pneumatic transport stream for delivery to a dust burner.
13. A method as set forth in claim 12 wherein air in the tank is maintained stagnant and a small amount of outside air is fed into the tank.
14 . A method as set forth in claim 12 which further comprises the step of drawing off air from the settling and discharge chamber to maintain a pressure therein no greater than the air pressure in the tank.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3117618.6 | 1981-05-05 | ||
| DE3117618A DE3117618C2 (en) | 1981-05-05 | 1981-05-05 | Device for feeding fuel dust into a fluidized dust column |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1199231A true CA1199231A (en) | 1986-01-14 |
Family
ID=6131423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000402249A Expired CA1199231A (en) | 1981-05-05 | 1982-05-04 | Apparatus and method for feeding combustible dust material to a dust burner |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0064688B1 (en) |
| AT (1) | ATE11075T1 (en) |
| CA (1) | CA1199231A (en) |
| DE (2) | DE3117618C2 (en) |
| ZA (1) | ZA823007B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3317404A1 (en) * | 1983-05-13 | 1984-11-22 | Ruhrkohle-Carborat GmbH, 4152 Kempen | CARBON DUST BURNER |
| CN103277808B (en) * | 2013-05-07 | 2015-08-05 | 西安交通大学 | A kind of small-sized industrial boiler coal powder storage and supply system and control method |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR965098A (en) * | 1950-09-01 | |||
| GB190409016A (en) * | 1904-04-19 | 1905-03-02 | Reginald Seymour Prinsep | Improvements relating to Feeding Devices for use with Powdered Fuel. |
| AT97189B (en) * | 1921-07-01 | 1924-06-10 | Comb E Economica E Impianti El | Device for the formation of a combustible mixture from fuel dust and air. |
| AT114124B (en) * | 1926-05-01 | 1929-09-10 | Carbo Union Ind Mij Nv | Fuel dust feeder. |
| US1837635A (en) * | 1927-02-01 | 1931-12-22 | Horace Van Deventer | Powdered coal burner |
| DE477960C (en) * | 1927-03-25 | 1929-06-17 | Curt Hartmann Dipl Ing | Device for the controlled supply of coal dust from the bunker to the conveyor screw through a grate consisting of swinging members |
| FR695089A (en) * | 1930-05-05 | 1930-12-11 | Wertheimer Freres Ancienne Mai | Improvements to powder, make-up or other similar articles |
| US2652687A (en) * | 1949-11-30 | 1953-09-22 | Bituminous Coal Research | Gas turbine power plant solid fuel feeding means |
| DE909431C (en) * | 1951-07-27 | 1954-04-22 | Babcock & Wilcox Dampfkessel W | Device and method for conveying dust-like material, in particular coal dust |
| DE1014267B (en) * | 1952-01-24 | 1957-08-22 | Babcock & Wilcox Dampfkessel | Method for feeding fuel into a cyclone furnace |
| NL7514128A (en) * | 1975-12-04 | 1977-06-07 | Shell Int Research | METHOD AND EQUIPMENT FOR PARTIAL COMBUSTION OF CARBON POWDER. |
| DE2728386B2 (en) * | 1977-06-24 | 1980-07-31 | Azo-Maschinenfabrik Adolf Zimmermann Gmbh, 6960 Osterburken | Device for the metered transfer of bulk material into a pneumatic conveying stream |
-
1981
- 1981-05-05 DE DE3117618A patent/DE3117618C2/en not_active Expired
-
1982
- 1982-04-30 DE DE8282103695T patent/DE3261749D1/en not_active Expired
- 1982-04-30 EP EP82103695A patent/EP0064688B1/en not_active Expired
- 1982-04-30 AT AT82103695T patent/ATE11075T1/en active
- 1982-05-03 ZA ZA823007A patent/ZA823007B/en unknown
- 1982-05-04 CA CA000402249A patent/CA1199231A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ZA823007B (en) | 1983-03-30 |
| DE3117618C2 (en) | 1985-10-31 |
| EP0064688B1 (en) | 1985-01-02 |
| ATE11075T1 (en) | 1985-01-15 |
| DE3261749D1 (en) | 1985-02-14 |
| EP0064688A1 (en) | 1982-11-17 |
| DE3117618A1 (en) | 1983-04-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |