CA1070571A - Process and pre-combustion installation for the burning of milled peat or similar materials - Google Patents
Process and pre-combustion installation for the burning of milled peat or similar materialsInfo
- Publication number
- CA1070571A CA1070571A CA279,030A CA279030A CA1070571A CA 1070571 A CA1070571 A CA 1070571A CA 279030 A CA279030 A CA 279030A CA 1070571 A CA1070571 A CA 1070571A
- Authority
- CA
- Canada
- Prior art keywords
- combustion
- cyclone
- fuel
- combustion chamber
- burning
- 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
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 120
- 239000003415 peat Substances 0.000 title claims abstract description 31
- 238000009434 installation Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 title description 4
- 239000000446 fuel Substances 0.000 claims abstract description 22
- 238000002844 melting Methods 0.000 claims abstract description 11
- 230000008018 melting Effects 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 239000002956 ash Substances 0.000 claims description 22
- 239000007789 gas Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- 235000002918 Fraxinus excelsior Nutrition 0.000 claims description 6
- 230000002745 absorbent Effects 0.000 claims description 2
- 239000002250 absorbent Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
- F23C3/006—Combustion apparatus characterised by the shape of the combustion chamber the chamber being arranged for cyclonic combustion
- F23C3/008—Combustion apparatus characterised by the shape of the combustion chamber the chamber being arranged for cyclonic combustion for pulverulent fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
- F23C6/02—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in parallel arrangement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
- F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method and apparatus is disclosed for burning of fuel such as milled peat or the like. The peat and the combustion air are fed into a combustion chamber via tangential channels. The combustion cyclone also includes a liquid or gas nozzle for producing an auxiliary flame. According to the invention only the fastest-burning, dust-like and gaseous parts of the peat are burned in the combustion cyclone, at a temperature below the melting point of the ash. The flames from the cyclone are directed through a flame opening into a boiler furnace. The coarser parts of the peat are directed into a second combustion chamber wherein they are burned and from which the flames are directed through another flame opening into the boiler furnace. The advantage of the invention is in that the removal of the ash be controlled even when the dampness of the peat varies and in that the necessary pre-combustion installation is relatively inexpensive.
A method and apparatus is disclosed for burning of fuel such as milled peat or the like. The peat and the combustion air are fed into a combustion chamber via tangential channels. The combustion cyclone also includes a liquid or gas nozzle for producing an auxiliary flame. According to the invention only the fastest-burning, dust-like and gaseous parts of the peat are burned in the combustion cyclone, at a temperature below the melting point of the ash. The flames from the cyclone are directed through a flame opening into a boiler furnace. The coarser parts of the peat are directed into a second combustion chamber wherein they are burned and from which the flames are directed through another flame opening into the boiler furnace. The advantage of the invention is in that the removal of the ash be controlled even when the dampness of the peat varies and in that the necessary pre-combustion installation is relatively inexpensive.
Description
107057~
KYMIN OSAKEYHTI~ - KYMMENE AKTIEBOLAG, Kuusankoski Process and pre-combustion installation for the burning of milled peat or similar materials The present invention relates to a process for burning milled peat or similar material in a pre-combustion installation in which the combustion cyclone is connected to the furnace of the boiler by a flame opening, the peat and the combustion air being fed into the combustion cyclone through tangential channels; in addition the combustion cyclone has a liquid or gas nozzle for an auxiliary flame. The invention also relates to a pre-combustion installation for carrying out the process, the installation comprising a combustion cyclone connected to the furnace of the boiler by a flame opening and, linked tangentially to the combustion cyclone, a feeding channel for the peat to be burned and a channel for the combustion air, as well as oil or gas nozzles for the auxiliary flame.
It is a known method to burn milled peat, at a temperature above the melting point of the ashes, in the combustion cyclone of a pre-combustion installation operating in connection with a boiler installation and to remove the ash in a molten state.
, . - . .
- .-107057~
~ -2-It is also a known method to burn milled peat in a combustion Cyclone of a pre-combustion installation operating in connec-tion with a boiler installation, keeping the temperature so low that the ash can be withdrawn in a dry state.
The disadvantage of these known processes is the difficulty in controlling the temperature, owing to large variations in the dampness of milled peat. When peat is burned at a high temp-erature, occasional excessive dampness of the peat will cause a decrease in the temperature, solidification of the molten ash, and clogging o~ the cyclone. Also, a large-sized com-bustion cyclone must be constructed to tolerate these high temperatures, which makes it expensive. When peat is burned at a low temperature, occasional extreme dryness of peat will cause an increase in the temperature, partial melting of the ash, and its solidification on the cyclone walls.
The object of the present invention is to develop further the process for burning milled peat or similar materials in pre-combustion installations so that the removal of the ash can be controlled even when the dampness of the peat varies, and that the necessary pre-combustion installation is moderately priced.
Generally, the present invention provides a process for burning moisture absorbing fuel such as milled peat in a pre-combus-tion apparatus of the type including a combustion cyclone hav-ing a flame opening communicating with a furnace of a boiler, said process including the steps of: feeding the fuel into said combustion cyclone in a generally tengential direction while generally simultaneously generating therein auxiliary flame by feeding into said cyclone an auxiliary fuel mixture comprising liquid or gas fuel; burning within said cyclone fastest-burning, dust-li~e and gaseous fractions of said mois-ture absorbent fuel at a temperature below the melting point of ashes of said moisture absorbing fuel; directing the flames generated ir. said cyclone into said furnace through said flame opening; removing coarser particles of said moisture '~ ~
. . ,, :
~ -2a-absorbing fuel from said cyclone and introducing same into a second combustion chamber; burning said coarser particles in said second combustion chamber; direction flames generated in said second combustion chamber into said furnace at a locus generally radially spaced from that of said flame opening.
Pxeferably, combustion air for use in the second combustion chamber is pre-heated in a generally annular space formed in wall means of the combustion cyclone, whereby said air simul-taneously cools an inner shell of said wall means.
In another aspect, the present invention provides a pre-combustion installation comprising a first combustion cyclone connected to a boiler furnace by means of a first flame opening disposed in a wall of said furnace, a feed channel for supply-ing moisture absorbing fuel such as peat to be burned, and a combustion air channel, both said channels communicating gen-erally tangentially with the first combustion cyclone, and oil or gas nozzles operatively associated with said combustion cyclone for producing an auxiliary flame; a second combustion chamber operatively connected with the first combustion cyclone ~y means of fuel-feeding and combustion air channel means, said second combustion chamber communicating with the boiler furnace by means of a second flame opening in the wall of said furnace the second combustion chamber having an ash outlet pipe.
Preferably, in the last mentioned embodiment the combustion cyclone has a double mantle and includes means for feeding a part of combustion air into a generally annular space formed in the wall of said cyclone in order to cool an inner shell thereof and to simultaneously heat com~ustion air for use in the second combustion chamber.
In the process according to the invention, under all conditions the temperature of the combustion cyclone can be kept so low that the ash will not melt. Such a combustion cyclone is .oderately priced.
107057~
-2b-One of the combustion chambers can be a combustion cyclone in which the temperature is kept above the melting point of the ash and the ash is removed in a molten state. The other com-bustion chamber can be provided with cooling pipes also, in which case the combustion is not adiabatic, and the tempera-ture can be kept below the melting point o f the ash and the ash is withdrawn in a ` 1070571 dry state. The heat-resistant second combustion chamber can be small in size.
The attached drawing illustrates one embodiment of the pre-combustion installation invented for carrying out the process according to the invention; however, the invention is not limi-ted to it.
Fig. 1 shows a vertical cross section of the pre-combustion installation. Fig. 2 shows a cross section of the pre-combus-tion installation along A-A in Fig. 1, seen in the direction indicated by the arrows. Fig. 3 shows a cross section of pre-combustion installation along B-B in Fig. 1, seen in the direction indicated by the arrows.
The pre-combustion installation depicted has a combustion cyclone 1 with a horizontal axis and below it, as a second combustion chamber, a combustion cyclone 2 which also has a horizontal axis. The combustion cyclone 1 has an aperture 3, to which is linked tangentially a feed channel 4, and an aper-ture 5, to which i8 linked tangentially a branch 7 of the air channel 6. The combustion cyclone 1 has an inner mantle 8 and an outer mantle 9, both made from steel plate. The second branch 12 of the air channel 6 is linked tangentially to the space 10 between the mantles. Between the branches 7 and 12 of the air channel there is a regulating flap 13. The inner mantle 8 of the combustion cyclone 1 has an aperture 16, and a connecting channel 17 starting from this aperture 16 leads through the space 10 and the outer mantle 9 to the second combustion cyclone 2, passing throughits steel mantle 18 and its internal protective masonry 19 and joining it tangentially at the point 20. The connecting channel 22 starts from the space 10 between the mantles of the combustion cyclone 1 and joins the second combustion cyclone 2, also tangentially, at the point 23. The combustion cyclone 1 has a flame opening 26, which leads through the boiler wall 27 to the furnace 28 of the boiler. Part of the mantle of the combustion cyclone 1 . ~ . ,.-~ 1070571 consists of a secondary air channel 30, in which there is an opening 31 at the flame opening 26. The second combustion cyclone 2 has a flame opening 33 which leads to the boiler furnace 28. At the lowest point of the second combustion cyclone 2 there is~an outlet 35 for the flow of molten ash.
The combustion cyclone 1 has oil nozzles 40 and around them an air channel 41. The entire inner surface of the second combustion cyclone 2 is protected by masonry 19.
In a pre-combustion installation of the type described above, milled peat is burned by the process according to the invention as follows:
Into the combustion cyclone 1, which is pre-heated by the oil flame at the nozzle 40, peat is fed, carried by flue gas, through the channel 4, and combustion air is fed from the channel 6 through its branch 7, whereby the peat and the gases rotate in the cyclone, the peat heats up and dries, and its dust-like and gaseous parts ignite. The flame of the combustion cyclone 1 passes through the flame opening 26 into the boiler furnace 28 and receives secondary air through the opening 31.
In the combustion cyclone 1, the coarser parts of the peat are separated by centrifugal force to the periphery, while the gaseous and dust-like parts pass to the center, carried by heating and expanding gases. The coarser parts of the peat pass, partly unburned, through the connecting channel 17 into the second combustion cyclone 2. Air flows from the air channel 6 through its branch 12 into the space between the mantles 8 and 9 of the combustion cyclone 1, where it cools the inner mantle 8 of the combustion cyclone 1 and itself is heated. The heated air flows along the connecting channel 22 tangentially into the second combustion cyclone
KYMIN OSAKEYHTI~ - KYMMENE AKTIEBOLAG, Kuusankoski Process and pre-combustion installation for the burning of milled peat or similar materials The present invention relates to a process for burning milled peat or similar material in a pre-combustion installation in which the combustion cyclone is connected to the furnace of the boiler by a flame opening, the peat and the combustion air being fed into the combustion cyclone through tangential channels; in addition the combustion cyclone has a liquid or gas nozzle for an auxiliary flame. The invention also relates to a pre-combustion installation for carrying out the process, the installation comprising a combustion cyclone connected to the furnace of the boiler by a flame opening and, linked tangentially to the combustion cyclone, a feeding channel for the peat to be burned and a channel for the combustion air, as well as oil or gas nozzles for the auxiliary flame.
It is a known method to burn milled peat, at a temperature above the melting point of the ashes, in the combustion cyclone of a pre-combustion installation operating in connection with a boiler installation and to remove the ash in a molten state.
, . - . .
- .-107057~
~ -2-It is also a known method to burn milled peat in a combustion Cyclone of a pre-combustion installation operating in connec-tion with a boiler installation, keeping the temperature so low that the ash can be withdrawn in a dry state.
The disadvantage of these known processes is the difficulty in controlling the temperature, owing to large variations in the dampness of milled peat. When peat is burned at a high temp-erature, occasional excessive dampness of the peat will cause a decrease in the temperature, solidification of the molten ash, and clogging o~ the cyclone. Also, a large-sized com-bustion cyclone must be constructed to tolerate these high temperatures, which makes it expensive. When peat is burned at a low temperature, occasional extreme dryness of peat will cause an increase in the temperature, partial melting of the ash, and its solidification on the cyclone walls.
The object of the present invention is to develop further the process for burning milled peat or similar materials in pre-combustion installations so that the removal of the ash can be controlled even when the dampness of the peat varies, and that the necessary pre-combustion installation is moderately priced.
Generally, the present invention provides a process for burning moisture absorbing fuel such as milled peat in a pre-combus-tion apparatus of the type including a combustion cyclone hav-ing a flame opening communicating with a furnace of a boiler, said process including the steps of: feeding the fuel into said combustion cyclone in a generally tengential direction while generally simultaneously generating therein auxiliary flame by feeding into said cyclone an auxiliary fuel mixture comprising liquid or gas fuel; burning within said cyclone fastest-burning, dust-li~e and gaseous fractions of said mois-ture absorbent fuel at a temperature below the melting point of ashes of said moisture absorbing fuel; directing the flames generated ir. said cyclone into said furnace through said flame opening; removing coarser particles of said moisture '~ ~
. . ,, :
~ -2a-absorbing fuel from said cyclone and introducing same into a second combustion chamber; burning said coarser particles in said second combustion chamber; direction flames generated in said second combustion chamber into said furnace at a locus generally radially spaced from that of said flame opening.
Pxeferably, combustion air for use in the second combustion chamber is pre-heated in a generally annular space formed in wall means of the combustion cyclone, whereby said air simul-taneously cools an inner shell of said wall means.
In another aspect, the present invention provides a pre-combustion installation comprising a first combustion cyclone connected to a boiler furnace by means of a first flame opening disposed in a wall of said furnace, a feed channel for supply-ing moisture absorbing fuel such as peat to be burned, and a combustion air channel, both said channels communicating gen-erally tangentially with the first combustion cyclone, and oil or gas nozzles operatively associated with said combustion cyclone for producing an auxiliary flame; a second combustion chamber operatively connected with the first combustion cyclone ~y means of fuel-feeding and combustion air channel means, said second combustion chamber communicating with the boiler furnace by means of a second flame opening in the wall of said furnace the second combustion chamber having an ash outlet pipe.
Preferably, in the last mentioned embodiment the combustion cyclone has a double mantle and includes means for feeding a part of combustion air into a generally annular space formed in the wall of said cyclone in order to cool an inner shell thereof and to simultaneously heat com~ustion air for use in the second combustion chamber.
In the process according to the invention, under all conditions the temperature of the combustion cyclone can be kept so low that the ash will not melt. Such a combustion cyclone is .oderately priced.
107057~
-2b-One of the combustion chambers can be a combustion cyclone in which the temperature is kept above the melting point of the ash and the ash is removed in a molten state. The other com-bustion chamber can be provided with cooling pipes also, in which case the combustion is not adiabatic, and the tempera-ture can be kept below the melting point o f the ash and the ash is withdrawn in a ` 1070571 dry state. The heat-resistant second combustion chamber can be small in size.
The attached drawing illustrates one embodiment of the pre-combustion installation invented for carrying out the process according to the invention; however, the invention is not limi-ted to it.
Fig. 1 shows a vertical cross section of the pre-combustion installation. Fig. 2 shows a cross section of the pre-combus-tion installation along A-A in Fig. 1, seen in the direction indicated by the arrows. Fig. 3 shows a cross section of pre-combustion installation along B-B in Fig. 1, seen in the direction indicated by the arrows.
The pre-combustion installation depicted has a combustion cyclone 1 with a horizontal axis and below it, as a second combustion chamber, a combustion cyclone 2 which also has a horizontal axis. The combustion cyclone 1 has an aperture 3, to which is linked tangentially a feed channel 4, and an aper-ture 5, to which i8 linked tangentially a branch 7 of the air channel 6. The combustion cyclone 1 has an inner mantle 8 and an outer mantle 9, both made from steel plate. The second branch 12 of the air channel 6 is linked tangentially to the space 10 between the mantles. Between the branches 7 and 12 of the air channel there is a regulating flap 13. The inner mantle 8 of the combustion cyclone 1 has an aperture 16, and a connecting channel 17 starting from this aperture 16 leads through the space 10 and the outer mantle 9 to the second combustion cyclone 2, passing throughits steel mantle 18 and its internal protective masonry 19 and joining it tangentially at the point 20. The connecting channel 22 starts from the space 10 between the mantles of the combustion cyclone 1 and joins the second combustion cyclone 2, also tangentially, at the point 23. The combustion cyclone 1 has a flame opening 26, which leads through the boiler wall 27 to the furnace 28 of the boiler. Part of the mantle of the combustion cyclone 1 . ~ . ,.-~ 1070571 consists of a secondary air channel 30, in which there is an opening 31 at the flame opening 26. The second combustion cyclone 2 has a flame opening 33 which leads to the boiler furnace 28. At the lowest point of the second combustion cyclone 2 there is~an outlet 35 for the flow of molten ash.
The combustion cyclone 1 has oil nozzles 40 and around them an air channel 41. The entire inner surface of the second combustion cyclone 2 is protected by masonry 19.
In a pre-combustion installation of the type described above, milled peat is burned by the process according to the invention as follows:
Into the combustion cyclone 1, which is pre-heated by the oil flame at the nozzle 40, peat is fed, carried by flue gas, through the channel 4, and combustion air is fed from the channel 6 through its branch 7, whereby the peat and the gases rotate in the cyclone, the peat heats up and dries, and its dust-like and gaseous parts ignite. The flame of the combustion cyclone 1 passes through the flame opening 26 into the boiler furnace 28 and receives secondary air through the opening 31.
In the combustion cyclone 1, the coarser parts of the peat are separated by centrifugal force to the periphery, while the gaseous and dust-like parts pass to the center, carried by heating and expanding gases. The coarser parts of the peat pass, partly unburned, through the connecting channel 17 into the second combustion cyclone 2. Air flows from the air channel 6 through its branch 12 into the space between the mantles 8 and 9 of the combustion cyclone 1, where it cools the inner mantle 8 of the combustion cyclone 1 and itself is heated. The heated air flows along the connecting channel 22 tangentially into the second combustion cyclone
2 as combustion air. In the second combustion cyclone the coarser particles of the peat burn owing to the heated combustion air at so high a temperature that the ash melts, : , -: .
`` i(~70571 flows through the outlet 35 and drips down the vertical pipe 36 into cooling water, from where it is removed in a cooled state. The flame of the second combustion cyclone 2 passes through the flame opening 33 into the boiler furnace 28.
The burning of the peat is regulated so as to keep the temperature of the combustion cyclone 1 always below the melting point of the ash and the temperature of the second combustion cyclone 2 above the melting point of the ash. The combustion is regulated by means of the total quantity of air, the quantity of secondary air, the regulating flap 13, and the auxiliary flame of the oil nozzle 40.
A liquid or gas nozzle for an auxiliary flame can be added to the second combustion chamber 2 of the pre-combustion installation according to the invention and/or a secondary air channel can be fitted in connection with the flame opening 33.
. . . .
~ ', - '- . :.: ' . ~
`` i(~70571 flows through the outlet 35 and drips down the vertical pipe 36 into cooling water, from where it is removed in a cooled state. The flame of the second combustion cyclone 2 passes through the flame opening 33 into the boiler furnace 28.
The burning of the peat is regulated so as to keep the temperature of the combustion cyclone 1 always below the melting point of the ash and the temperature of the second combustion cyclone 2 above the melting point of the ash. The combustion is regulated by means of the total quantity of air, the quantity of secondary air, the regulating flap 13, and the auxiliary flame of the oil nozzle 40.
A liquid or gas nozzle for an auxiliary flame can be added to the second combustion chamber 2 of the pre-combustion installation according to the invention and/or a secondary air channel can be fitted in connection with the flame opening 33.
. . . .
~ ', - '- . :.: ' . ~
Claims (8)
1. A process for burning moisture absorbing fuel such as milled peat in a pre-combustion apparatus of the type including a combustion cyclone having a flame opening communicating with a furnace of a boiler, said process including the steps of:
a) feeding the fuel into said combustion cyclone in a generally tangential direction while generally simultaneously generating therein auxiliary flame by feeding into said cyclone an auxiliary fuel mixture comprising liquid or gas fuel;
b) burning within said cyclone fastest-burning, dust-like and gaseous fractions of said moisture absorbent fuel at a temperature below the melting point of ashes of said moisture absorbing fuel;
c) directing the flames generated in said cyclone into said furnace through said flame opening;
d) removing coarser particles of said moisture absorbing fuel from said cyclone and introducing same into a second combustion chamber;
e) burning said coarser particles in said second combustion chamber;
f) direction flames generated in said second combustion chamber into said furnace at a locus generally radially spaced from that of said flame opening.
a) feeding the fuel into said combustion cyclone in a generally tangential direction while generally simultaneously generating therein auxiliary flame by feeding into said cyclone an auxiliary fuel mixture comprising liquid or gas fuel;
b) burning within said cyclone fastest-burning, dust-like and gaseous fractions of said moisture absorbent fuel at a temperature below the melting point of ashes of said moisture absorbing fuel;
c) directing the flames generated in said cyclone into said furnace through said flame opening;
d) removing coarser particles of said moisture absorbing fuel from said cyclone and introducing same into a second combustion chamber;
e) burning said coarser particles in said second combustion chamber;
f) direction flames generated in said second combustion chamber into said furnace at a locus generally radially spaced from that of said flame opening.
2. A process according to claim 1, wherein combustion air for use in the second combustion chamber is pre-heated in a generally annular space formed in wall means of the combustion cyclone, whereby said air simultaneously cools an inner shell of said wall means.
3. A process according to claim 1 or 2, wherein said coarser particles of said moisture absorbing fuel are forced to the periphery of the cyclone by centrifugal force, and are separated from expanding gases and dusts advanced by a centripetal flow in a burning state through the flame opening into the boiler furnace.
4. A process according to claim 1 or 2, wherein the coarser particles are burned in said second combustion chamber at a temperature above the melting point of ashes of said moisture absorbing fuel.
5. A process according to claim 1 or 2, wherein the coarser particles of the moisture absorbing fuel are separated from said fastest burning and gaseous fraction by centrifugal force, the coarser particles of the moisture absorbing fuel being burned in said second combustion chamber at a temperature above the melting point of ashes of said moisture absorbing fuel.
6. A pre-combustion installation comprising a first combustion cyclone connected to a boiler furnace by means of a first flame opening disposed in a wall of said furnace, a feed channel for supplying moisture absorbing fuel such as peat to be burned, and a combustion air channel, both said channels communicating generally tangentially with the first combustion cyclone, and oil or gas nozzles operatively associated with said combustion cyclone for producing an auxiliary flame; a second combustion chamber operatively connected with the first combustion cyclone by means of fuel-feeding and combustion air channel means, said second combustion chamber communicating with the boiler furnace by means of a second flame opening in the wall of said furnace, the second combustion chamber having an ash outlet pipe.
7. A pre-combustion installation according to claim 6, characterized in that the combustion cyclone has a double mantle and includes means for feeding a part of combustion air into a generally annular space formed in the wall of said cyclone in order to cool an inner shell thereof and to simultaneously heat combustion air for use in the second combustion chamber.
8. A pre-combustion installation according to claims 6 or 7 characterized in that the second combustion chamber is a combustion cyclone provided with protective masonry on the inside and also provided with an outlet for molten ashes.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI761474A FI58557C (en) | 1976-05-25 | 1976-05-25 | FOERFARANDE OCH FOERFOERBRAENNINGSANORDNING FOER FOERBRAENNING AV MEDELST FRAES UPPTAGEN TORV ELLER DYLIK MATERIAL |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1070571A true CA1070571A (en) | 1980-01-29 |
Family
ID=8510017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA279,030A Expired CA1070571A (en) | 1976-05-25 | 1977-05-24 | Process and pre-combustion installation for the burning of milled peat or similar materials |
Country Status (4)
| Country | Link |
|---|---|
| CA (1) | CA1070571A (en) |
| FI (1) | FI58557C (en) |
| IE (1) | IE45602B1 (en) |
| SE (1) | SE425816B (en) |
-
1976
- 1976-05-25 FI FI761474A patent/FI58557C/en not_active IP Right Cessation
-
1977
- 1977-05-24 CA CA279,030A patent/CA1070571A/en not_active Expired
- 1977-05-24 IE IE1057/77A patent/IE45602B1/en unknown
- 1977-05-25 SE SE7706140A patent/SE425816B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| IE45602L (en) | 1977-11-25 |
| SE7706140L (en) | 1977-11-26 |
| FI58557B (en) | 1980-10-31 |
| IE45602B1 (en) | 1982-10-06 |
| FI761474A7 (en) | 1977-11-26 |
| FI58557C (en) | 1981-02-10 |
| SE425816B (en) | 1982-11-08 |
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