CA1085232A - Method and apparatus for treating exhaust gases from a furnace - Google Patents
Method and apparatus for treating exhaust gases from a furnaceInfo
- Publication number
- CA1085232A CA1085232A CA335,891A CA335891A CA1085232A CA 1085232 A CA1085232 A CA 1085232A CA 335891 A CA335891 A CA 335891A CA 1085232 A CA1085232 A CA 1085232A
- Authority
- CA
- Canada
- Prior art keywords
- furnace
- cleaning device
- gases
- gas
- organic 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
Links
- 239000007789 gas Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 16
- 239000001301 oxygen Substances 0.000 claims abstract description 16
- 239000011368 organic material Substances 0.000 claims abstract description 15
- 238000002485 combustion reaction Methods 0.000 claims abstract description 13
- 230000002950 deficient Effects 0.000 claims abstract description 11
- 239000013618 particulate matter Substances 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000010791 quenching Methods 0.000 abstract 1
- 230000000171 quenching effect Effects 0.000 abstract 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000010813 municipal solid waste Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000443 aerosol Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000005180 public health Effects 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Landscapes
- Incineration Of Waste (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method and apparatus for treating off-gas from a furnace for burning organic material in an oxygen deficient atmosphere by passing the hot exhaust gases from the furnace ladened with combustible and noncombustible organic material to a cleaning device, and thence passing the gases to a secondary furnace for combustion therein, and while in the cleaning device removing-from the gas therein noncombustible material which would otherwise still be particulate matter in the exhaust from the secondary furnace. In another form of the invention, the exhaust gas from the furnace is passed to a burner and heat exchanger device having an inlet portion for heating the incoming gases, a combustion portion with air inlets for supporting combustion therein, and an outlet portion for cooling the gases, and thereafter the gases are passed to a quenching system.
A method and apparatus for treating off-gas from a furnace for burning organic material in an oxygen deficient atmosphere by passing the hot exhaust gases from the furnace ladened with combustible and noncombustible organic material to a cleaning device, and thence passing the gases to a secondary furnace for combustion therein, and while in the cleaning device removing-from the gas therein noncombustible material which would otherwise still be particulate matter in the exhaust from the secondary furnace. In another form of the invention, the exhaust gas from the furnace is passed to a burner and heat exchanger device having an inlet portion for heating the incoming gases, a combustion portion with air inlets for supporting combustion therein, and an outlet portion for cooling the gases, and thereafter the gases are passed to a quenching system.
Description
~8~ii;~;~
This is a division of application Serial No. 282,746 filed ~uly 14, 1977.
BACKGROUND OF THE INVENTION
This invention relates to method and apparatus for treating off-gas from a furnace for burning organic material in an oxygen deficient atmosphere. The invention is particu-larly adapted, among other possible uses, for use in treating the exhaust gases from burning municipal, industrial or community garbage, trash or refuse, and sewage sludge, for example.
The problem of preventing air pollution in our present environment has become a critical matter. The seriousness of this problem is such that the National Air Pollution Control Administration Air Criteria (U.S. Public Health) as well as the Environmental Protection Agency, have constantly been tightening the minimum required standards.
In view of the new and higher standards of air emission, it has become more difficult and expensive to treat the exhaust gases from such incineration. I have substantially reduced this problem in a new and improved manner. as will become -apparent as the description proceeds.
SUM~IARY OF THE INVENTION
In order to accomplish the desired results, the invention provides, in one form thereof, a new and improved method of treating off-gas from a furnace for burning organic material in an oxygen deficient atmosphere, which includes the steps of passing hot exhaust gases from the furnace that are ladened with combustible and noncombustible organic material ;~
to a cleaning device, and thereafter passing the gases to a secondary furnace for combustion therein. In the cleaning device there is removed from the exhaust gas, the non-- 1- '~ ;
~1352~2 combustible material which would otherwise still be particulate matter in the exhaust of the secondary furnace. According to one aspect of the invention, the exhaust gases are maintained at substantially constant temperature in the cleaning device during the step of removing the noncombustible matter which would otherwise still be particulate matter in the exhaust from the secondary furnace, and according to another aspect thereof heat is added to the gases entering the cleaning device so as to maintain the temperature therein at about 1200F.
There has thus been outlined rather broadly the more important features of the invention in order that the detailed description thereof that follows may be better understood, and in order that the present contribution to the art may be better appreciated. There are, of course, additional features of the invention that will be described hereinafter and which will form the subject of the claims appended hereto. Those skilled in the art will appreciate that the conception upon which the disclosure is based may readily be utilized as a basis for the designing of other methods and apparatus for carrying out the several purposes of the invention. It is important, therefore, that the claims be regarded as including such equivalent methods and apparatus as do not depart from the spirit and `
scope of -the invention. -Specific embodiments of the invention have been chosen for purposes of illustration and description, and are shown in the accompanying drawings, forming a part of the specification.
BRIEF DESCRIPTION OF THE DRAWING
Figure 1 is a diagrammatic illustration of a system for treating off-gas from a furnace burning organic material in an oxygen deficient atmosphere, according to one embodiment : . - : : : : . . :.... ~
1~85~3~:
of the invention; and Figure 2 is a diagrammatic illustration of a system similar to Fig. 1, but showing another embodiment of the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Heretofore, in order to support combustion, excess air was added at the bottom of the furnace. Problems were encountered due to the fact that the middle portions of the furnace tended to overheat beyond the structural design limits of the furnace, and in order to overcome this problem, it was thought necessary to add more air or oxygen at the bottom of the furnace. Thus, such a system frequently operated with as much as 100~ excess air (above that required for supporting combustion) being added at the bottom of the furnace in order - --to cool the central portion thereof to workable limits.
However, such excess air tended to entrain or carry with it particulate matter into the exhaust gases, which compounded ~ --the problem of treating such gases. In a copending Canadian application Serial No. 282,750 filed on the same date as the present application and entitled "Method and Apparatus for Incinerating Waste Material" there is disclosed a new and improved system wherein the air supply is controlled so that in most portions of the furnace there is a deficiency of oxygen, as compared to that theoretically required for complete combustion. This substantially reduces the problem, but there is still a need for treating the exhaust gases.
In the embodiment of Fig. 1, there is illustrated a furnace 10 having an upper waste material inlet 12, a lower solids outlet 14 and an upper exhaust gas outlet 16. This furnace may be of any suitable type such as a multiple hearth, rotary shaft kiln, or the like, for example. It may be ~:3185Z3~
directly or indirectly fired. However, the burning therein is effected in an oxygen deficient atmosphere with respect to that required for theoretically complete combustion. Conse-quently, the exhaust gases appearing at the exhaust gas outlet 16 are hot and are ladened with combustible and noncombustible organic material. That is, these gases may contain particulate matter, hydrocarbons, carbonyles, stable organic aerosols (including tar fog or blue haze) as well as various gases, and ~;
the like. It will be appreciated that this exhaust gas may contain substantial heat value, which according to the present invention, is converted into useful form.
As seen in Fig. 1, the exhaust gases from the furnace 10 are passed to a cleaning device 18 and heat may be added thereto, as at 20, prior to the cleani~g device. Thereafter, the so-cleaned exhaust gases are passed to a secondary furnace or burning device 22 after air or oxygen has been added thereto, as indicated at 24, so that the discharge 26 from the secondary furnace is relatively clean.
The cleaning device 18 may be of any suitable type, which removes from the exhaust gases the noncombustibles which would otherwise still be particulate matter in the exhaust after the combustion step in the secondary furnace 22.
Preferably according to the invention, the cleaning device 18 cleans the exhaust gases without cooling them and for such purposes the type of cleaning device may include a hot cyclone, electrostatic precipitator or a hot mechanical filter (stone or metal), for example. More preferably, the cleaning device 18 is of such a nature that it does not catch or collect combustible particles such as the tar fog. This is effected by adding heat, as indicated at 20, so as to maintain the temperature in the cleaning device 18 above about 1200F. so ;:
that the tar fog becomes vapor and passes through to the second furnace 22. It will be appreciated that if the tem-perature in the cleaning device 18 falls below about 1200F.
the carbon dioxide will crack according to the reaction 2CO ~ C ~ CO2, which produces fixed carbon, i.e. carbon black and the like that creates a soot problem.
Thus, it will be seen that if the off-gas from the furnace 10 is cleaned in the manner described above the sensible heat contained therein may readily be employed for useful purposes in the secondary furnace or heating device 22.
In the embodiment of the invention illustrated in Fig. 2, a furnace 28 is provided, which may be of the same -type as that described hereinbefore in connection with the ~
furnace 10 of Fig. 1. Thus, the furnace 28 has an upper waste ~;
material inlet 30, a lower solids outlet 32 and an upper ;
exhaust gas outlet 34. The exhaust gases from the outlet 34 thence pass to a burner and heat exchanger device 36, having ~ ~
an inner tubular member 38 for receiving the gases through an inlet 39 and an outer tubular member 40 encompassing the inner member. An outlet 42 is provided in the outer tubular member at the same end of the device as where the inlet 39 is located. At the opposite end of the device, as indicated at 43, air or oxygen is added, as at 44, and water and/or steam may also be added, if necessary, as at 46. In operation, the exhaust gases enter the device through the inlet 39 at a temperature of from about 400F. to about 1000F. and are heated in the inner tube 38. When these so-heated gases reach the area of the device indicated at 43, air or oxygen is added and water and/or steam is also added, if necessary, whereby combustion occurs and the gases are heated to a temperature in the range of from about 1200F. to about 2000F. The tar fog .: . . : : .-, : . ;, ~L~852;~
and carbon convert to material, which will be noncondensible at standard pressure and temperature conditions. Thereafter, the gases pass back through the outer tube 40 wherein their tem-perature gradually drops to a temperature in the range of from about 400F. to about 1000F. by means of giving up heat to the incoming exhaust gas. These gases leave the burner and heat exchanger device through the outlet 42 and are passed to a quencher system 48. The quencher 48 receives a cold Lluid as at 50 which is heated therein before it is discharged as a `
heated fluid, as at 52. In operation, the gases enter the quencher system 48 where they are rapidly quenched. In some installations, this system may also include cleaning means or other cold gas cleaning devices. The output from the quencher is passed to a secondary furnace 54 or to a pipe line 56 for further processing. The heated fluid discharged from the quencher system at 52 is profitably employed in a heat exchanger such as for preheating boiler feed water, preheating combustion air or preheating the waste material fed to the furnace 28, for , example. Also, as another example, the heated fluid per se could be used as combustion air. .
Having thus described the invention with particular reference to the preferred forms thereof, it will be obvious to those skilled in the art to which the invention pertains, after understanding the invention that various changes and modifi-cations may be made therein without departing from the spirit and scope of the lnvention, as defined by the claims appended hereto.
'' `
This is a division of application Serial No. 282,746 filed ~uly 14, 1977.
BACKGROUND OF THE INVENTION
This invention relates to method and apparatus for treating off-gas from a furnace for burning organic material in an oxygen deficient atmosphere. The invention is particu-larly adapted, among other possible uses, for use in treating the exhaust gases from burning municipal, industrial or community garbage, trash or refuse, and sewage sludge, for example.
The problem of preventing air pollution in our present environment has become a critical matter. The seriousness of this problem is such that the National Air Pollution Control Administration Air Criteria (U.S. Public Health) as well as the Environmental Protection Agency, have constantly been tightening the minimum required standards.
In view of the new and higher standards of air emission, it has become more difficult and expensive to treat the exhaust gases from such incineration. I have substantially reduced this problem in a new and improved manner. as will become -apparent as the description proceeds.
SUM~IARY OF THE INVENTION
In order to accomplish the desired results, the invention provides, in one form thereof, a new and improved method of treating off-gas from a furnace for burning organic material in an oxygen deficient atmosphere, which includes the steps of passing hot exhaust gases from the furnace that are ladened with combustible and noncombustible organic material ;~
to a cleaning device, and thereafter passing the gases to a secondary furnace for combustion therein. In the cleaning device there is removed from the exhaust gas, the non-- 1- '~ ;
~1352~2 combustible material which would otherwise still be particulate matter in the exhaust of the secondary furnace. According to one aspect of the invention, the exhaust gases are maintained at substantially constant temperature in the cleaning device during the step of removing the noncombustible matter which would otherwise still be particulate matter in the exhaust from the secondary furnace, and according to another aspect thereof heat is added to the gases entering the cleaning device so as to maintain the temperature therein at about 1200F.
There has thus been outlined rather broadly the more important features of the invention in order that the detailed description thereof that follows may be better understood, and in order that the present contribution to the art may be better appreciated. There are, of course, additional features of the invention that will be described hereinafter and which will form the subject of the claims appended hereto. Those skilled in the art will appreciate that the conception upon which the disclosure is based may readily be utilized as a basis for the designing of other methods and apparatus for carrying out the several purposes of the invention. It is important, therefore, that the claims be regarded as including such equivalent methods and apparatus as do not depart from the spirit and `
scope of -the invention. -Specific embodiments of the invention have been chosen for purposes of illustration and description, and are shown in the accompanying drawings, forming a part of the specification.
BRIEF DESCRIPTION OF THE DRAWING
Figure 1 is a diagrammatic illustration of a system for treating off-gas from a furnace burning organic material in an oxygen deficient atmosphere, according to one embodiment : . - : : : : . . :.... ~
1~85~3~:
of the invention; and Figure 2 is a diagrammatic illustration of a system similar to Fig. 1, but showing another embodiment of the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Heretofore, in order to support combustion, excess air was added at the bottom of the furnace. Problems were encountered due to the fact that the middle portions of the furnace tended to overheat beyond the structural design limits of the furnace, and in order to overcome this problem, it was thought necessary to add more air or oxygen at the bottom of the furnace. Thus, such a system frequently operated with as much as 100~ excess air (above that required for supporting combustion) being added at the bottom of the furnace in order - --to cool the central portion thereof to workable limits.
However, such excess air tended to entrain or carry with it particulate matter into the exhaust gases, which compounded ~ --the problem of treating such gases. In a copending Canadian application Serial No. 282,750 filed on the same date as the present application and entitled "Method and Apparatus for Incinerating Waste Material" there is disclosed a new and improved system wherein the air supply is controlled so that in most portions of the furnace there is a deficiency of oxygen, as compared to that theoretically required for complete combustion. This substantially reduces the problem, but there is still a need for treating the exhaust gases.
In the embodiment of Fig. 1, there is illustrated a furnace 10 having an upper waste material inlet 12, a lower solids outlet 14 and an upper exhaust gas outlet 16. This furnace may be of any suitable type such as a multiple hearth, rotary shaft kiln, or the like, for example. It may be ~:3185Z3~
directly or indirectly fired. However, the burning therein is effected in an oxygen deficient atmosphere with respect to that required for theoretically complete combustion. Conse-quently, the exhaust gases appearing at the exhaust gas outlet 16 are hot and are ladened with combustible and noncombustible organic material. That is, these gases may contain particulate matter, hydrocarbons, carbonyles, stable organic aerosols (including tar fog or blue haze) as well as various gases, and ~;
the like. It will be appreciated that this exhaust gas may contain substantial heat value, which according to the present invention, is converted into useful form.
As seen in Fig. 1, the exhaust gases from the furnace 10 are passed to a cleaning device 18 and heat may be added thereto, as at 20, prior to the cleani~g device. Thereafter, the so-cleaned exhaust gases are passed to a secondary furnace or burning device 22 after air or oxygen has been added thereto, as indicated at 24, so that the discharge 26 from the secondary furnace is relatively clean.
The cleaning device 18 may be of any suitable type, which removes from the exhaust gases the noncombustibles which would otherwise still be particulate matter in the exhaust after the combustion step in the secondary furnace 22.
Preferably according to the invention, the cleaning device 18 cleans the exhaust gases without cooling them and for such purposes the type of cleaning device may include a hot cyclone, electrostatic precipitator or a hot mechanical filter (stone or metal), for example. More preferably, the cleaning device 18 is of such a nature that it does not catch or collect combustible particles such as the tar fog. This is effected by adding heat, as indicated at 20, so as to maintain the temperature in the cleaning device 18 above about 1200F. so ;:
that the tar fog becomes vapor and passes through to the second furnace 22. It will be appreciated that if the tem-perature in the cleaning device 18 falls below about 1200F.
the carbon dioxide will crack according to the reaction 2CO ~ C ~ CO2, which produces fixed carbon, i.e. carbon black and the like that creates a soot problem.
Thus, it will be seen that if the off-gas from the furnace 10 is cleaned in the manner described above the sensible heat contained therein may readily be employed for useful purposes in the secondary furnace or heating device 22.
In the embodiment of the invention illustrated in Fig. 2, a furnace 28 is provided, which may be of the same -type as that described hereinbefore in connection with the ~
furnace 10 of Fig. 1. Thus, the furnace 28 has an upper waste ~;
material inlet 30, a lower solids outlet 32 and an upper ;
exhaust gas outlet 34. The exhaust gases from the outlet 34 thence pass to a burner and heat exchanger device 36, having ~ ~
an inner tubular member 38 for receiving the gases through an inlet 39 and an outer tubular member 40 encompassing the inner member. An outlet 42 is provided in the outer tubular member at the same end of the device as where the inlet 39 is located. At the opposite end of the device, as indicated at 43, air or oxygen is added, as at 44, and water and/or steam may also be added, if necessary, as at 46. In operation, the exhaust gases enter the device through the inlet 39 at a temperature of from about 400F. to about 1000F. and are heated in the inner tube 38. When these so-heated gases reach the area of the device indicated at 43, air or oxygen is added and water and/or steam is also added, if necessary, whereby combustion occurs and the gases are heated to a temperature in the range of from about 1200F. to about 2000F. The tar fog .: . . : : .-, : . ;, ~L~852;~
and carbon convert to material, which will be noncondensible at standard pressure and temperature conditions. Thereafter, the gases pass back through the outer tube 40 wherein their tem-perature gradually drops to a temperature in the range of from about 400F. to about 1000F. by means of giving up heat to the incoming exhaust gas. These gases leave the burner and heat exchanger device through the outlet 42 and are passed to a quencher system 48. The quencher 48 receives a cold Lluid as at 50 which is heated therein before it is discharged as a `
heated fluid, as at 52. In operation, the gases enter the quencher system 48 where they are rapidly quenched. In some installations, this system may also include cleaning means or other cold gas cleaning devices. The output from the quencher is passed to a secondary furnace 54 or to a pipe line 56 for further processing. The heated fluid discharged from the quencher system at 52 is profitably employed in a heat exchanger such as for preheating boiler feed water, preheating combustion air or preheating the waste material fed to the furnace 28, for , example. Also, as another example, the heated fluid per se could be used as combustion air. .
Having thus described the invention with particular reference to the preferred forms thereof, it will be obvious to those skilled in the art to which the invention pertains, after understanding the invention that various changes and modifi-cations may be made therein without departing from the spirit and scope of the lnvention, as defined by the claims appended hereto.
'' `
Claims (6)
1. A method of treating off-gas from a furnace for burning organic material in an oxygen deficient atmosphere comprising the steps of continuously passing hot exhaust gases from said furnace ladened with combustible and noncombustible organic material to a cleaning device, and thence passing the gases to a secondary furnace for combustion therein, removing in said cleaning device from said exhaust gas therein non-combustible material which would otherwise still be particulate matter in the exhaust of said secondary furnace.
2. A method of treating off-gas from a furnace for burning organic material in an oxygen deficient atmosphere according to claim 1, wherein said exhaust gases are maintained at substantially a constant temperature in the cleaning device during said step of removing the noncombustible matter which would otherwise still be particulate matter in the exhaust of said secondary furnace.
3. A method of treating off-gas from a furnace for burning organic material in an oxygen deficient atmosphere according to claim 1, wherein heat is added to said gases entering said cleaning device to maintain a temperature in the cleaning device of the order of about 1200°F.
4. Apparatus for treating off-gas from a furnace for burning organic material in an oxygen deficient atmosphere comprising, in combination, means for passing hot exhaust gases ladened with combustible and noncombustible organic material to a cleaning device, a secondary furnace, means for passing the gases discharged from said cleaning device to said secondary furnace, and means for removing in said cleaning device from said exhaust gas therein noncombustible material which would otherwise still be particulate matter in the exhaust of said secondary furnace.
5. Apparatus for treating off-gas from a furnace for burning organic material in an oxygen deficient atmosphere according to claim 4, further comprising means for maintaining said exhaust gases in said cleaning device at substantially a constant temperature.
6. Apparatus for treating off-gas from a furnace for burning organic material in an oxygen deficient atmosphere according to claim 4, further comprising means for adding heat to said gases entering said cleaning device to maintain a tem-perature in the cleaning device of the order of about 1200°F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA335,891A CA1085232A (en) | 1976-07-19 | 1979-09-18 | Method and apparatus for treating exhaust gases from a furnace |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US706,613 | 1976-07-19 | ||
| US05/706,613 US4078503A (en) | 1976-07-19 | 1976-07-19 | Method and apparatus for treating off-gas from a furnace for burning organic material in an oxygen deficient atmosphere |
| CA282,746A CA1082047A (en) | 1976-07-19 | 1977-07-14 | Method and apparatus for treating exhaust gases from a furnace |
| CA335,891A CA1085232A (en) | 1976-07-19 | 1979-09-18 | Method and apparatus for treating exhaust gases from a furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1085232A true CA1085232A (en) | 1980-09-09 |
Family
ID=27165180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA335,891A Expired CA1085232A (en) | 1976-07-19 | 1979-09-18 | Method and apparatus for treating exhaust gases from a furnace |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1085232A (en) |
-
1979
- 1979-09-18 CA CA335,891A patent/CA1085232A/en not_active Expired
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |