CA1313603C - Apparatus for incinerating combustible material - Google Patents
Apparatus for incinerating combustible materialInfo
- Publication number
- CA1313603C CA1313603C CA000587625A CA587625A CA1313603C CA 1313603 C CA1313603 C CA 1313603C CA 000587625 A CA000587625 A CA 000587625A CA 587625 A CA587625 A CA 587625A CA 1313603 C CA1313603 C CA 1313603C
- Authority
- CA
- Canada
- Prior art keywords
- zone
- combustion
- drying
- vessel
- combustible material
- 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
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Abstract
ABSTRACT OF DISCLOSURE
A rotary kiln device for incinerating combustible materials such as municipal and commercial waste materials. The kiln is a co-current gas-material flow apparatus. The kiln is divided by means of a dam into a drying zone and a combustion zone.
Waste material is retained within the drying zone sufficiently long so that that moisture contained in the material is driven off. Air for combustion is supplied directly to the combustion zone. bypassing the drying zone so that self-sustaining combustion may take place.
A rotary kiln device for incinerating combustible materials such as municipal and commercial waste materials. The kiln is a co-current gas-material flow apparatus. The kiln is divided by means of a dam into a drying zone and a combustion zone.
Waste material is retained within the drying zone sufficiently long so that that moisture contained in the material is driven off. Air for combustion is supplied directly to the combustion zone. bypassing the drying zone so that self-sustaining combustion may take place.
Description
I APPARATUS FOR INCINERATING COMBUSTIBLE MATERIAL
"
BACKGROUND OF THE INVENTION
I This invention relates to an apparatus for incinerating ,combustible material and in pacticular to a rotary kiln apparatus for incinerating waste materials such as municipal solid waste or commercial waste materials.
l Prior to the present invention, it was known to incinerate Lunicipal, commercial solid waste material and hazardous !I~aterials to achieve volume reduction and/or eliminate ha2aLdous elements before being placed in a landfill.
~ypically, the solid waste includes approximately twenty-five percent non-combu~tible~ (ash), thirty peccent moisture, ¦¦typical ranges are between fifteen percent and seventy-five ¦Ipercent moisture, and forty-five percent combustibles. The higher tha percentage of moisture that exists in the waste, the more difficult it is to achieve proper lgnition and complete combustion of the combustible matecials.
: ~
In order to achieve low operating cost~, a æolid waste lincineration system must be designed to utilize a mini~um of auxiliary fuel. Most of the heat requirement should com2 from the heating value in the ~olid waste.
i One method for ~solid waste incineration is mass burning of ~the material on a stoker~7rate boiler. While this technoloqy is proven and well established, the capital cost for such ~facilities are hlgh.
! o~l 7ln~h;~
~ 1 3 1 3603 ¦I Prior ~o the present invention, rota~y kilns have been utilized as a alternate to stoker grate boilers, as they requice les~ capital cost and can be economically utilized for smaller quantitie~ of wa6ted material. One of the disadvantages of the rotary kiln is that when the material flow in the kiln is counter-current to the gas flow, the gas exit temperature i5 lowered by the cold, wet feed prior to the gas leaving the kiln. Since the exhaust ga~es may c~ntain some ~combustible material or carbon monoxide, extra fuel must be ljadded to an afterburner to complete the combustion of the combustibles in the gas 6tream.
To burn the solid waste in a rotary kiln in a co-current gas-material or parallel flow configuration, in order to more easily ~tart ignition of the bed of material~, keep exit gas ¦Itemperatures high, and to keep the use of afterburner auxiliary-fuel to a minimum, it is necessary to predry the material.
According to present technology, a separate drier is utilized ahead of the kiln to dry the material. This drier is usually a grat~; drier or rotary drier. This additional piece of equip-Rnt requices additional capital outlay and increases installation and operating costs.
An alternate proces6 utilizes ma~s burning in a water walled waste incineration boiler and a~sociatad e~uipment tend to provide a reduced temperature burning zone because of the cooling effect o~ the water walls thus encouraging the for=atio~ of undesirable combu~tion byproducts.
" ~ ' i 0 ~ 7 1 T~ ; A ~1 '7 , I
According to the present invention, a device has been provided which allow6 the drying of the solid material to occur inside the rotary kiln in a co--current gas-material flow sys~em. While rotary kiln6 using co-current or parallel gag and material flow are known as for example in U. S. Patent No.
l3,436,061 issued April 1, 1969, the present invention provides j~la novel arrangement for achieving predrying and co-current flow ~of the combustion ga~es and burning wastes to facilitate high l opeeating temperatures in the range of 1600F to 3200F in the combustion and discharge zone~. These high burning temperatures assisted by radiant reflected heat from- the ! refractory lined kiln together with efficient air supply helps ¦¦to produce complete combustion and therefore avoids the formation of undesirable by-products such as dioxins, carbon monoxide, combustibla particulate material and similar gaseous and particulate emissions in the exhaust gases and ash streams.
SUMMARY
I~ therefore the principal object of thi~ invention to provide an apparatus for incinerating combustible material which is capable of achieving complete combu~tion of the waste ! naterial while substantially avoidi~g the dis~harg~ of material ~hich has not achieved complete combustion, in both the solid discharge and in the exhaust gas discharge.
!
Il It i8 a further object of this invention to provide an ,~apparatus for incinerating combusSibla material which "integrates the drying zone with the combu~tion zone to provide ~Ireduced capital costs.
a~ n /~
1 3 1 3~03 Ij In general, the fo~egoing and other object~ will be car~ied out by p~oviding an apparatus for incinerating combustible material comp~ising an elongated cylindrical ves~el mounted on an incline for ro~ation about its own axis and having an upper inlet end for teceiving material to be incinerated and a lower outlet end for discha~ging ash from the combustion of said material; means for supplying combustible material to the inlet end of the vessel; dam means for dividing the vessel into a Ijdcyinq zone and a combustion zone and for increasing the ¦Iretention time of material in the drying zone; mean~ for jlsupplying hot deying gases to said drying zone: means extending ¦¦through the drying zone for supplying air for combustion directly to said combustion zone bypas6ing the drying zone; and an outlet for spent drying ga~es and combustion gases from the , vessel flow connected to the lower outlet end of the vessel ¦Iwhereby the flow of gases through the ve~sel is co-current to ~the flow of material from the inlet to the outlet and material to be incinerated i8 first dried in said drying zone, is discharged fro~ said drying zone by displacement over said dam meanR into said combustion zone, and incinerated in said combu~tion zone.
The invention consists of a rotary kiln serving as a vessel mounted on an incline for rotation about it8 own axis. The ;~vessel include~ a dam which divides the kiln into a drying zone and a combu~tion zone. The ~oi~t Eolid waste is supplied to ~Ithe drying zone together with hot dcying gases to flow ¦Ico-cu~rent or parallel with the material flow from the upper jinlet end of the kiln to the lower discharge end of the kiln.
The dam in the kiln ~erves to provide retention tlme Lor the .
a~ hi ~ 4 _ , material within the drying zone compared with a straight ~through kiln.
.1 Combuztion air and an ignition burner extend directly into the combu~tion zone of the kiln, bypa~sing the drying zone. If lldesired, lifters, chain~ and other internal heat exchange ¦Idevices well known to those skilled in the art may be included ~in the drying zone of the kiln to increase the efficiency of the d~ying zone.
The major portion of the combustion and excess air used to burn the dried waste will enter the Lotary ~iln at the front end through a bucner pipe ~useended into the kiln and pas~ing through the drying zone and located for providing combustion air at the front end of the burner zone. Secondary air could also enter the kiln through a separate secondary air pipe separate from the burner pipe. An ignition burner nozzle is located at the beginning of the burning zone to help establish combustion during start-up. Once ignition is established, the dry wa~t~ entering the burning zone will iqnite without the need ~o~ auxiliary fuel.
il BRIEP DESCRIPTION OF ~HE DRAWING
The inve~tion will ba described in con~ection with the annexed drawing wherein the single figure of the drawing is a diagramatic view of the incinerator of the pre~ent invention.
~,~ , ~ 5 ~1 ¦ DESCRIPTION OF THE PREFERRED EMBODIMæNT
Il Refecring to the dra~ing, the invention consi~ts of a 'cotacy ves6el generally indicated at 1 mounted on an incline ilfor rotation about it~ own axi8 and generally referred to as a rotary kiln. The kiln include~ an upper inlet end 2 for llreceiving material to be incinerated and combustion air and i drying air and a lower outlet end ~i for discharging solid ash which is the product of the incineration and spent drying and , combu~tion gas. The kiln may be mounted on suitable rollers l¦with a drive mechanism, both of which are known to those ~killed in the art and need not be described herein. The kiln may also have a suitable end seal arrangement 4 at the inlet end and sealing device (not shown) at the outlet end 3.
¦ The vessel include~ a dam means 10 for dividing the vessel into a upper drying zone 15 and a lower combustion or burning zone 20. Thi~ means 10 may take the form of a refractory dam, the con~truction of which will be known to those having ordina~y- ~kill in the refractory art. It should have ~uffi~ient height to establish suitable retention time in the drying zone depending upon tha established feed rate, kiln capacity and anticipated moisture content of the waste to be incinerated.
', The app.aratus also includes a means 16 for supplying hot ga~es to the dryin~ zone 15 and a means 17 ~uch as a pipe for . supplying solid waste to be incinerated to the drying zone 15.
I
Il , !l 1, .
A conduit mean~ 21 is provided ~oc ~upplying combustion and exce~s air to the combustion zone zo. This conduit 20 may be 'connected to a ssurce of p~eheated or ambient air. An ignition pipe 22 may be mounted with the pipe 21 to 6upply ignition fuel to a combu~tion zone 20 in a manner to be described. The conduit meanfi 21 extends through the drying zone for supplying 'lic for combustion directly to the burning or combu~tion zone 20, by-pa~ing the drying zone lS.
.1 I The outlet end of the kiln may be connected to a stationary j combu~tion chamber 30. The bottom of the stationary combustion chamber may include a pit 32 for ceceivinq ash fro~ the kiln 1. A conveyor 34 i~ pcovided foc removing a~h from the pit and ~upplying it tO a removal system such as a cart 35.
I The secondary combustion chamber may have an outlet 36 connected to a waste heat boiler (not shown) and an outlet 40 which i~ flow connected through duct~ 41 and 42 to the inlet 16 for drying ga~. The~e ga~es may be on the ocder of between 300 F and 800 F. If desired, ambient air may be supplied to th~-conduit 41 thLough a damper 44 to reduce the temperature of the gase~ admitted at 16. A hot air fan or bloweL 46 may be included between the duct 41 and the duct 42.
As an alternate. heated ambient air may be ~upplied through a conduit 48 from a source (not shown) to the drying chamber.
~ither,or both of t~e~e ~ource~ of drying ai~ may be utilized.
During the operation of the system, the combustion zone may be maintained ae a tem~erature in the range of 1600 F to l l .
I
!
~1800 F and even up to 3200 F, and the secondary combustion lchamber may also be maintained at a temperature in the range of ,1600 F to lB00 F and up to 3200 F, depending on the waste material being incinerated. If desired, it may be suitable to add a combustion bu~ner to the secondary combu~tion chamber to complete incineration of combustible gases which might be discharged from the system.
Ij , In operation, the solid wa~te feed i8 supplied to the drying zone 15 and retained therein by the dam 10. In this drying zone, the heated drying gas supplied through 16 serves to drive off the moi6ture contained in the waste ~aterial l preferably without initiating combustion therein. It i8 r I pceferred that the tempeeature of the dryinq gases ~be hlgh enough to dry the material but not 80 high as to initiate extensive com4.u~tion. A3 the material tumbles around in the cotating kiln, the material is exposed to the hot co-cur~ent flow of gas and material through the ve~sel.
L~fters may be added to the dcying zone 80 that as the material tumbles within the rotating kiln, it ca~cades through the flow of hot drying gase~. Also. if desired. a chain curtain or other internal heat exchange devices may be included in the drying zone to facilitate the tran~fer of heat from the hot ga3 to the moist material. As new material is added, the , ~aterial is discharged over the da~ 10 by displacemene into the 1, combustion zone. Preheated combu~tion air is supplied directly to this zone through inlet 21 and the dried wa6te material is incinerated therein and finally discharged through outlet 3.
In the preferred oparation, the combustible waste will have .
sufficient fuel value to be self-sustaining and maintain the ,neces~ary combu~tion temperatures and the burner and fuel supply line 22 i8 required only for initial stact-up.
The spent drying and cQmbustion gases are discharged into l¦the secondary combustion chamber where there i8 sufficient "retention time to complete combu~tion of the combustible ¦gases. The ash i~ discharged into the pit 3Z for removal from the system.
l From the foregoing it can be seen that the objects of the 1 present invention have been carried QUt. An economical system has been provided for incinerating~ combu~tible wa~te by providing a drying zone which erovides for sufficient retention time to complete the drying of the material. The dried material i6 then immediately supplied to a combustion zone for incineration. The supply of frssh ai~ directly to the combustion zone insures the complete incineration. The exit gases fro~ th~ system are not at a reduced temperature as would be thQ~ca~o in the counter-current flow rotary kiln and hence com~}-t~i combuation of the exhau~t gase~ can take place.
Additional fuel is not required in the 6ystem because the exhaust gasec may at least partially be utilized for drying the inco~ing feed.
It is intended that the invention not be limited by the focegoing description but be limited ~olely by that which i8 within the scope of the appended claims.
~ ' 1 ,~ ., , _ 9 _
"
BACKGROUND OF THE INVENTION
I This invention relates to an apparatus for incinerating ,combustible material and in pacticular to a rotary kiln apparatus for incinerating waste materials such as municipal solid waste or commercial waste materials.
l Prior to the present invention, it was known to incinerate Lunicipal, commercial solid waste material and hazardous !I~aterials to achieve volume reduction and/or eliminate ha2aLdous elements before being placed in a landfill.
~ypically, the solid waste includes approximately twenty-five percent non-combu~tible~ (ash), thirty peccent moisture, ¦¦typical ranges are between fifteen percent and seventy-five ¦Ipercent moisture, and forty-five percent combustibles. The higher tha percentage of moisture that exists in the waste, the more difficult it is to achieve proper lgnition and complete combustion of the combustible matecials.
: ~
In order to achieve low operating cost~, a æolid waste lincineration system must be designed to utilize a mini~um of auxiliary fuel. Most of the heat requirement should com2 from the heating value in the ~olid waste.
i One method for ~solid waste incineration is mass burning of ~the material on a stoker~7rate boiler. While this technoloqy is proven and well established, the capital cost for such ~facilities are hlgh.
! o~l 7ln~h;~
~ 1 3 1 3603 ¦I Prior ~o the present invention, rota~y kilns have been utilized as a alternate to stoker grate boilers, as they requice les~ capital cost and can be economically utilized for smaller quantitie~ of wa6ted material. One of the disadvantages of the rotary kiln is that when the material flow in the kiln is counter-current to the gas flow, the gas exit temperature i5 lowered by the cold, wet feed prior to the gas leaving the kiln. Since the exhaust ga~es may c~ntain some ~combustible material or carbon monoxide, extra fuel must be ljadded to an afterburner to complete the combustion of the combustibles in the gas 6tream.
To burn the solid waste in a rotary kiln in a co-current gas-material or parallel flow configuration, in order to more easily ~tart ignition of the bed of material~, keep exit gas ¦Itemperatures high, and to keep the use of afterburner auxiliary-fuel to a minimum, it is necessary to predry the material.
According to present technology, a separate drier is utilized ahead of the kiln to dry the material. This drier is usually a grat~; drier or rotary drier. This additional piece of equip-Rnt requices additional capital outlay and increases installation and operating costs.
An alternate proces6 utilizes ma~s burning in a water walled waste incineration boiler and a~sociatad e~uipment tend to provide a reduced temperature burning zone because of the cooling effect o~ the water walls thus encouraging the for=atio~ of undesirable combu~tion byproducts.
" ~ ' i 0 ~ 7 1 T~ ; A ~1 '7 , I
According to the present invention, a device has been provided which allow6 the drying of the solid material to occur inside the rotary kiln in a co--current gas-material flow sys~em. While rotary kiln6 using co-current or parallel gag and material flow are known as for example in U. S. Patent No.
l3,436,061 issued April 1, 1969, the present invention provides j~la novel arrangement for achieving predrying and co-current flow ~of the combustion ga~es and burning wastes to facilitate high l opeeating temperatures in the range of 1600F to 3200F in the combustion and discharge zone~. These high burning temperatures assisted by radiant reflected heat from- the ! refractory lined kiln together with efficient air supply helps ¦¦to produce complete combustion and therefore avoids the formation of undesirable by-products such as dioxins, carbon monoxide, combustibla particulate material and similar gaseous and particulate emissions in the exhaust gases and ash streams.
SUMMARY
I~ therefore the principal object of thi~ invention to provide an apparatus for incinerating combustible material which is capable of achieving complete combu~tion of the waste ! naterial while substantially avoidi~g the dis~harg~ of material ~hich has not achieved complete combustion, in both the solid discharge and in the exhaust gas discharge.
!
Il It i8 a further object of this invention to provide an ,~apparatus for incinerating combusSibla material which "integrates the drying zone with the combu~tion zone to provide ~Ireduced capital costs.
a~ n /~
1 3 1 3~03 Ij In general, the fo~egoing and other object~ will be car~ied out by p~oviding an apparatus for incinerating combustible material comp~ising an elongated cylindrical ves~el mounted on an incline for ro~ation about its own axis and having an upper inlet end for teceiving material to be incinerated and a lower outlet end for discha~ging ash from the combustion of said material; means for supplying combustible material to the inlet end of the vessel; dam means for dividing the vessel into a Ijdcyinq zone and a combustion zone and for increasing the ¦Iretention time of material in the drying zone; mean~ for jlsupplying hot deying gases to said drying zone: means extending ¦¦through the drying zone for supplying air for combustion directly to said combustion zone bypas6ing the drying zone; and an outlet for spent drying ga~es and combustion gases from the , vessel flow connected to the lower outlet end of the vessel ¦Iwhereby the flow of gases through the ve~sel is co-current to ~the flow of material from the inlet to the outlet and material to be incinerated i8 first dried in said drying zone, is discharged fro~ said drying zone by displacement over said dam meanR into said combustion zone, and incinerated in said combu~tion zone.
The invention consists of a rotary kiln serving as a vessel mounted on an incline for rotation about it8 own axis. The ;~vessel include~ a dam which divides the kiln into a drying zone and a combu~tion zone. The ~oi~t Eolid waste is supplied to ~Ithe drying zone together with hot dcying gases to flow ¦Ico-cu~rent or parallel with the material flow from the upper jinlet end of the kiln to the lower discharge end of the kiln.
The dam in the kiln ~erves to provide retention tlme Lor the .
a~ hi ~ 4 _ , material within the drying zone compared with a straight ~through kiln.
.1 Combuztion air and an ignition burner extend directly into the combu~tion zone of the kiln, bypa~sing the drying zone. If lldesired, lifters, chain~ and other internal heat exchange ¦Idevices well known to those skilled in the art may be included ~in the drying zone of the kiln to increase the efficiency of the d~ying zone.
The major portion of the combustion and excess air used to burn the dried waste will enter the Lotary ~iln at the front end through a bucner pipe ~useended into the kiln and pas~ing through the drying zone and located for providing combustion air at the front end of the burner zone. Secondary air could also enter the kiln through a separate secondary air pipe separate from the burner pipe. An ignition burner nozzle is located at the beginning of the burning zone to help establish combustion during start-up. Once ignition is established, the dry wa~t~ entering the burning zone will iqnite without the need ~o~ auxiliary fuel.
il BRIEP DESCRIPTION OF ~HE DRAWING
The inve~tion will ba described in con~ection with the annexed drawing wherein the single figure of the drawing is a diagramatic view of the incinerator of the pre~ent invention.
~,~ , ~ 5 ~1 ¦ DESCRIPTION OF THE PREFERRED EMBODIMæNT
Il Refecring to the dra~ing, the invention consi~ts of a 'cotacy ves6el generally indicated at 1 mounted on an incline ilfor rotation about it~ own axi8 and generally referred to as a rotary kiln. The kiln include~ an upper inlet end 2 for llreceiving material to be incinerated and combustion air and i drying air and a lower outlet end ~i for discharging solid ash which is the product of the incineration and spent drying and , combu~tion gas. The kiln may be mounted on suitable rollers l¦with a drive mechanism, both of which are known to those ~killed in the art and need not be described herein. The kiln may also have a suitable end seal arrangement 4 at the inlet end and sealing device (not shown) at the outlet end 3.
¦ The vessel include~ a dam means 10 for dividing the vessel into a upper drying zone 15 and a lower combustion or burning zone 20. Thi~ means 10 may take the form of a refractory dam, the con~truction of which will be known to those having ordina~y- ~kill in the refractory art. It should have ~uffi~ient height to establish suitable retention time in the drying zone depending upon tha established feed rate, kiln capacity and anticipated moisture content of the waste to be incinerated.
', The app.aratus also includes a means 16 for supplying hot ga~es to the dryin~ zone 15 and a means 17 ~uch as a pipe for . supplying solid waste to be incinerated to the drying zone 15.
I
Il , !l 1, .
A conduit mean~ 21 is provided ~oc ~upplying combustion and exce~s air to the combustion zone zo. This conduit 20 may be 'connected to a ssurce of p~eheated or ambient air. An ignition pipe 22 may be mounted with the pipe 21 to 6upply ignition fuel to a combu~tion zone 20 in a manner to be described. The conduit meanfi 21 extends through the drying zone for supplying 'lic for combustion directly to the burning or combu~tion zone 20, by-pa~ing the drying zone lS.
.1 I The outlet end of the kiln may be connected to a stationary j combu~tion chamber 30. The bottom of the stationary combustion chamber may include a pit 32 for ceceivinq ash fro~ the kiln 1. A conveyor 34 i~ pcovided foc removing a~h from the pit and ~upplying it tO a removal system such as a cart 35.
I The secondary combustion chamber may have an outlet 36 connected to a waste heat boiler (not shown) and an outlet 40 which i~ flow connected through duct~ 41 and 42 to the inlet 16 for drying ga~. The~e ga~es may be on the ocder of between 300 F and 800 F. If desired, ambient air may be supplied to th~-conduit 41 thLough a damper 44 to reduce the temperature of the gase~ admitted at 16. A hot air fan or bloweL 46 may be included between the duct 41 and the duct 42.
As an alternate. heated ambient air may be ~upplied through a conduit 48 from a source (not shown) to the drying chamber.
~ither,or both of t~e~e ~ource~ of drying ai~ may be utilized.
During the operation of the system, the combustion zone may be maintained ae a tem~erature in the range of 1600 F to l l .
I
!
~1800 F and even up to 3200 F, and the secondary combustion lchamber may also be maintained at a temperature in the range of ,1600 F to lB00 F and up to 3200 F, depending on the waste material being incinerated. If desired, it may be suitable to add a combustion bu~ner to the secondary combu~tion chamber to complete incineration of combustible gases which might be discharged from the system.
Ij , In operation, the solid wa~te feed i8 supplied to the drying zone 15 and retained therein by the dam 10. In this drying zone, the heated drying gas supplied through 16 serves to drive off the moi6ture contained in the waste ~aterial l preferably without initiating combustion therein. It i8 r I pceferred that the tempeeature of the dryinq gases ~be hlgh enough to dry the material but not 80 high as to initiate extensive com4.u~tion. A3 the material tumbles around in the cotating kiln, the material is exposed to the hot co-cur~ent flow of gas and material through the ve~sel.
L~fters may be added to the dcying zone 80 that as the material tumbles within the rotating kiln, it ca~cades through the flow of hot drying gase~. Also. if desired. a chain curtain or other internal heat exchange devices may be included in the drying zone to facilitate the tran~fer of heat from the hot ga3 to the moist material. As new material is added, the , ~aterial is discharged over the da~ 10 by displacemene into the 1, combustion zone. Preheated combu~tion air is supplied directly to this zone through inlet 21 and the dried wa6te material is incinerated therein and finally discharged through outlet 3.
In the preferred oparation, the combustible waste will have .
sufficient fuel value to be self-sustaining and maintain the ,neces~ary combu~tion temperatures and the burner and fuel supply line 22 i8 required only for initial stact-up.
The spent drying and cQmbustion gases are discharged into l¦the secondary combustion chamber where there i8 sufficient "retention time to complete combu~tion of the combustible ¦gases. The ash i~ discharged into the pit 3Z for removal from the system.
l From the foregoing it can be seen that the objects of the 1 present invention have been carried QUt. An economical system has been provided for incinerating~ combu~tible wa~te by providing a drying zone which erovides for sufficient retention time to complete the drying of the material. The dried material i6 then immediately supplied to a combustion zone for incineration. The supply of frssh ai~ directly to the combustion zone insures the complete incineration. The exit gases fro~ th~ system are not at a reduced temperature as would be thQ~ca~o in the counter-current flow rotary kiln and hence com~}-t~i combuation of the exhau~t gase~ can take place.
Additional fuel is not required in the 6ystem because the exhaust gasec may at least partially be utilized for drying the inco~ing feed.
It is intended that the invention not be limited by the focegoing description but be limited ~olely by that which i8 within the scope of the appended claims.
~ ' 1 ,~ ., , _ 9 _
Claims (9)
1. Apparatus for incinerating combustible material comprising an elongated cylindrical vessel mounted on an incline for rotation about its own axis and having an upper inlet end for receiving material to be incinerated and a lower outlet end for discharging ash from the ? of said material; means for supplying combustible material to the inlet end of the vessel; dam means for dividing the vessel into a drying zone and a combustion zone and for increasing the retention time of material in the drying zone; means for supplying hot drying gases to said drying zone; means extending through the drying zone for supplying air for combustion directly to said combustion zone by-passing the drying zone;
and an outlet for spent drying gases and combustion gases from the vessel flow connected to the lower outlet end of the vessel whereby the flow of gases through the vessel is co-current to the flow of material from the inlet to the outlet and material to be incinerated is first dried in said drying zone, is discharged from said drying zone by displacement over said dam means into said combustion zone and incinerated in said combustion zone.
and an outlet for spent drying gases and combustion gases from the vessel flow connected to the lower outlet end of the vessel whereby the flow of gases through the vessel is co-current to the flow of material from the inlet to the outlet and material to be incinerated is first dried in said drying zone, is discharged from said drying zone by displacement over said dam means into said combustion zone and incinerated in said combustion zone.
2. Apparatus for incinerating combustible material according to claim 1 further comprising a secondary combustion chamber flow connected to the outlet for spent drying and combustion gases.
3. Apparatus for incinerating combustible material according to claim 2 further comprising conduit means extending from said secondary combustion chamber to the inlet of said vessel to define the means for supplying hot drying gases to the drying zone.
4. Apparatus for incinerating combustible material according to claim 3 further comprising means for adding ambient air to said conduit means.
5. Apparatus for incinerating combustible material according to claim 1 further comprising an ignition burner extending into said combustion zone.
6. Apparatus for incinerating combustible material according to claim 5 further comprising a secondary combustion chamber flow connected to the outlet for spent drying and combustion gases.
7. Apparatus for incinerating combustible material according to claim 6 further comprising conduit means extending from said secondary combustion chamber to the inlet of said vessel to define the means for supplying hot drying gases to the drying zone.
8. Apparatus for incinerating combustible material according to claim 7 further comprising means for adding ambient air to said conduit means.
9. Apparatus for incinerating combustible material according to claim 8 further comprising means for removing ash from the outlet end of the vessel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15613588A | 1988-02-16 | 1988-02-16 | |
| US07/156,135 | 1988-02-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1313603C true CA1313603C (en) | 1993-02-16 |
Family
ID=22558255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000587625A Expired - Fee Related CA1313603C (en) | 1988-02-16 | 1989-01-06 | Apparatus for incinerating combustible material |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1313603C (en) |
-
1989
- 1989-01-06 CA CA000587625A patent/CA1313603C/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 20020218 |