CA1270732A - Methanol vaporization of metal processing furnaces and the like - Google Patents
Methanol vaporization of metal processing furnaces and the likeInfo
- Publication number
- CA1270732A CA1270732A CA000502487A CA502487A CA1270732A CA 1270732 A CA1270732 A CA 1270732A CA 000502487 A CA000502487 A CA 000502487A CA 502487 A CA502487 A CA 502487A CA 1270732 A CA1270732 A CA 1270732A
- Authority
- CA
- Canada
- Prior art keywords
- furnace
- methanol
- nitrogen
- waste heat
- conduit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Tunnel Furnaces (AREA)
Abstract
METHANOL VAPORIZATION OF METAL PROCESSING
FURNACES AND THE LIKE
Abstract of the Invention A method and apparatus for treating metallic objects in a reducing atmosphere within a furnace is described which includes passing a mixture of liquid methanol and gaseous nitrogen through a conduit which is in heat transfer relationship with the waste heat from the furnace thereby vaporizing the methanol prior to injection into the furnace.
FURNACES AND THE LIKE
Abstract of the Invention A method and apparatus for treating metallic objects in a reducing atmosphere within a furnace is described which includes passing a mixture of liquid methanol and gaseous nitrogen through a conduit which is in heat transfer relationship with the waste heat from the furnace thereby vaporizing the methanol prior to injection into the furnace.
Description
3~
METHANOL VAPORIZATION FOR METAL PROCESSING FURNACES AND THE LIKE
This invent;on relates generally to metal processing furnaces requiring a reducing atmosphere, for example continuous brazing furnaces, annealing, sintering, neutral hardening and carburizing furnaces. Specifically, this invention relates to a method and apparatus for providing a reducing atmosphere within the furnace in an efficient and cost-2ffectiYe manner.
BACKGROUND OF THIS INVENTION
Open ended brazing furnaces and the like are ~ell known.
Typically, a part may have a dwell time of up to 1-1/2 hours in such a furnace in order ~or the particular operation to be accomplished.
In a brazing furnace, for example, parts are "brazed" together using copper or other brazing alloy between the parts. The furnace is typically at a temperature above the melting point of the brazing material.
In order to allow the brazing material to bond to the steel, iron or alloy parts, a reducing atmosphere is required which will reduce (remove) the oxides from the parts. By using a reducing atmosphere, no flux is required since the brazing material will run over and bond with the part when it has been cleaned due to the reducing atmosphere. The most common gaseous substance used for reducing is hydrogen (H2), and the most typical conventional mekhod currently used to provide the hydrogen ~s to spray atom k ed methanQl into the furnace cracking the methanol into two molecules of hydrogen and one of carbon monoxide. However~ this injection of atom k ed droplets of liquid methanol into the furnace, normally called sparaging, gives rise to a number of problems. In the first place, the atomization jets create undesirable turbulence at the furnace atmosphere, which leads to a high atmosphere consumption. This turbulence can also upset furnace performance. Although the methanol is in association with nitrogen, these ~wo components do not dwell in a heated surrounding, and the nitrogen simply acts as an atomizing medium for the methanol in the atomization jets of the sparger. This means that the methanol is not vaporized while in contact with the nitrogen prior to the atomization jets, and that all vaporization of the methanol in the conventional process takes place within the furnace and draws active heat away from the furnace interior.
~ f ~
Another problem with sparging relates to the fact th~t the conveying belt through the furnace is of a high alloy material in order to withstand the furnace heat. Droplets of liquid methanol must not be allowed to hit the belt, because at the high temperature of the belt the methanol would crack directly on the belt and would result in carbon being transferred into the belt, thus weaken;ng the belt~
Another disadvantage of the sparging method is that all of the energy for vaporizing the methanol (which must take place before it cracks) must come from the furnace, thus risking a decrease in furnace productivity.
An alternative method which is also presently known is t~
utilize a separate device to vaporize methanol~ The current cost of such devices is quite high, and of course extra electrical or other high priced energy must be provided in order to accomplish the vaporization.
Of course, pure hydrogen could also be provided to the furnace, but at the present time such a proposal is uneconomical compared to methanol.
GENERAL DESCRIPTION OF THIS INVENTION
.
In view of the foregoing problems with conventional ~ethods of proYiding a reducing atmosphere in a furnace of the kind under discussion, a method has been developed of vaporizing methanol without requiring additlonal electr~cal or other energy for khe vaporization, the method being one which simply utilizes waste heat already provided by the furnace itself.
It is not enough simply to pass the methanol through a conduit which receives the waste heat from the furnace. A sustained temperature above 60~C is re~uired for 100% methanol.
The essence of the invention relies on a recognition that Dalton's law o~ partial pressure permits, in effect, a lowering of the vaporization temperature of methanol when it comprises only a fraction of a mixture in which the other component is gaseous. Thus, for a mixture in which methanol is present at between 10~ and 20~, a temperature between 15C and 30C will suffice to rapidly vaporize all of the methanol. When the mixture consists of 60~ methanol, temperatures in the region of 50C are required. Specifically, nitrogen utilized as the gaseous component of the mix~ure and liquid ,;
.
3~
methanol is passed along with the nitrogen through a conduit, preferably copper heated in heat-transfer contact with a wall of the furnace through which waste heat passes.
For example, in a continuous brazing furnace operation a gas flow of 2,000 cubic feet per hour at atmospheric pressure is required. If the mixture consists of 20~ methanol approx;mately 5,500 BTU/hour of heat is needed for vaporization. If this heat is obtained from the waste heat of the furnace itself instead of from anelectrically heated sparger, considerable savings are achieved.
It is therefore an object of one aspect of this invention to provide a method of providing methanol within a metal processing furnace or the like which methanol comprises the steps of:
a) passing a mixture of liquid methanol and gaseous nitrogen through a conduit which is in heat transfer relationship with the waste heat from said furnace whereby the waste heat vaporizes the methanol into the nitrogen, and b) injecting the nitrogen and methanol gas into the furnace.
It is an object of another aspect of this invention to provide a furnace for metallic objects in a reducing atmosphere comprising:
20 a) an open ended furnace body having walls through which waste heat passes from a heat source within said body, b) a conveyor belt passing through said furnace, c) a conduit connected at i~s ups~ream end ~o a source of li~uid methanol and gaseous nitrogen and to at least one lnjection inlet in the Furnace wall at its downstream end, d) a portion of sa~d conduit posi~ioned in clost proximity ~o the wast heat from said furnace wall whereby the liquid methanol is vaporized into the nitrogen prior to injection into the furnace.
GENERAL DESCRIPTION OF THE DRAWINGS
The single figure is a schematic representation of a furnace with the methanol vaporization system of this invention installed.
DETAILE~ DESCRlPTION OF THE DRAWINGS
In the figure, a furnace 10 is shown in plan view. The furnace includes a vestibule 12 for entry of parts intented to pass through the furnace 10. A transition portion 14 is a typical part of such furnaces, and may have a round or rectangular cross-section.
The transition portion 14 incorporates a wall or walls through which waste heat from the furnace 10 passes.
. ., ~7~3!7;~
Wrapped around the transition portion 14 are two distinct coils 16 and 18 of copper pipe. The length of the coils is not critical, since it depends on the pipe diameter and the flow of methanol. As an example, however, the coi1s may each be about lO0 feet of 3/8" or l/2" tubing. A combined length of at least 150 feet and a diameter of 1/2" usually performs satisfactorily. The copper pipe thus constitutes a conduit in heat-trans~er relationship with the walls of the transition portion 14 through which waste heak passes, and therefore picks up waste heat from this region. The upstream ends of the two coils 16 and 18 come together at a "T" 20 and connect with a single conduit 22 from a control panel 24, the control panel hav1ng the capability of metering nitrogen and methanol into the upstream end 26 of the conduit 22. At the downstream end of coil 16 is an access fitting 28 which allows the mixture of nitrogen and vaporized methanol to enter the furnace at one side. A similar fitting 30 is provided for the coil 18 at the other side of the furnace. Downstream of hot zone 31 is an elongated cool down zone 32. A portion of conveyor belt 33 is shown at the discharge end of the furnace for removing the metal objects from the furnace.
Another means of heat transfer involves using the waste heat of the cooling water from the furnace cooling pipes. In normal brazing furnace operations the cooling water would be at approximately 60~C. Since the heat transfer relat~onsh1p between the methanol/nitrogen coil and the cooling water pipes is more efflcicnt than between the coll and the furnace wall, a short coil can be used between "T" 20 and access fitting 28.
It is quite satisfactory to operate the system at atmosphere, or at a pressure only sllghtly above atmosphere in order to cause the mixture to travel through the coils. However, the high pressures conventionally used for nitrogen sparging are not required~
A built-in safety feature is incorporated into the system in addition to the fact that the system is operated at substantially atmospheric pressure. Specifically, an energized-open solenoid is used for the methanol and the nitrogen entry into the conduit 22, so that upon power failure or induced power failure by safe~y interlocks the solenoid will close and the methanol and nitrogen feed will cease. At the same time, there is provided a parallel feed of nitrogen alone into the pipe, with a solenoi~ that is energized-closed. This ensures that, upon power failure. The furnace will be purged with n~trogen, and that no further methanol will enter it.
. .
. ~ .,: .
It will thus be appreciated ~hat I have provided a me~hod and apparatus by which a furnace can be furnished with a reducing atmosphere, without requiring the considerable expense involved in purchasing a separate methanol vaporizor unit, and without drawing away active heat from the interior of the furnace. The method of apparatus I have proposed utilize only waste heat, and furthermore avoid the problems created by the presence of liquid methanol droplets within the furnace. As indicated earlier, these droplets and the associated high velocity nitrogen can disrupt the furnace atmosphere9 lead to higher a~mosphere consu~ption, and cause changes in flow rate that can upset furnace performance. Also, the high alloy material of the conveying belt ~ould be destroyed if droplets were to contact it. A further problem with sparging is that it can create cold spots in the furnace.
It will be appreciated that the method of this invention could also employ other inert or near-inert gases in place of nitrogen, for example argon or helium. However, at the present time nitrogen appears to be the least expensive of the suitable gases available.
For a carburizing furnace, it is appropriate to use a mixture of gases containing approximately 60~ methanol, thus requiring a somewhat higher temperature of vaporization. The me~hanol gives CO
and H2 upon cracking within the furnace If it is des~red to slow the velocity of the yaseous mixture out of the colls 16 and 18 where they enter at the access fixtures 28 and 30, the copper piping can be expanded to a larger diameter, ~or example from 1/2" to 1".
While one embod~ment of this invention has been illustrated in the accompanying drawings, and described hereinabove, it will be evident to those skilled in the art that changes and modifications , 30 may be made therein, without departing from the essence of this invention as set forth in the appended claims.
METHANOL VAPORIZATION FOR METAL PROCESSING FURNACES AND THE LIKE
This invent;on relates generally to metal processing furnaces requiring a reducing atmosphere, for example continuous brazing furnaces, annealing, sintering, neutral hardening and carburizing furnaces. Specifically, this invention relates to a method and apparatus for providing a reducing atmosphere within the furnace in an efficient and cost-2ffectiYe manner.
BACKGROUND OF THIS INVENTION
Open ended brazing furnaces and the like are ~ell known.
Typically, a part may have a dwell time of up to 1-1/2 hours in such a furnace in order ~or the particular operation to be accomplished.
In a brazing furnace, for example, parts are "brazed" together using copper or other brazing alloy between the parts. The furnace is typically at a temperature above the melting point of the brazing material.
In order to allow the brazing material to bond to the steel, iron or alloy parts, a reducing atmosphere is required which will reduce (remove) the oxides from the parts. By using a reducing atmosphere, no flux is required since the brazing material will run over and bond with the part when it has been cleaned due to the reducing atmosphere. The most common gaseous substance used for reducing is hydrogen (H2), and the most typical conventional mekhod currently used to provide the hydrogen ~s to spray atom k ed methanQl into the furnace cracking the methanol into two molecules of hydrogen and one of carbon monoxide. However~ this injection of atom k ed droplets of liquid methanol into the furnace, normally called sparaging, gives rise to a number of problems. In the first place, the atomization jets create undesirable turbulence at the furnace atmosphere, which leads to a high atmosphere consumption. This turbulence can also upset furnace performance. Although the methanol is in association with nitrogen, these ~wo components do not dwell in a heated surrounding, and the nitrogen simply acts as an atomizing medium for the methanol in the atomization jets of the sparger. This means that the methanol is not vaporized while in contact with the nitrogen prior to the atomization jets, and that all vaporization of the methanol in the conventional process takes place within the furnace and draws active heat away from the furnace interior.
~ f ~
Another problem with sparging relates to the fact th~t the conveying belt through the furnace is of a high alloy material in order to withstand the furnace heat. Droplets of liquid methanol must not be allowed to hit the belt, because at the high temperature of the belt the methanol would crack directly on the belt and would result in carbon being transferred into the belt, thus weaken;ng the belt~
Another disadvantage of the sparging method is that all of the energy for vaporizing the methanol (which must take place before it cracks) must come from the furnace, thus risking a decrease in furnace productivity.
An alternative method which is also presently known is t~
utilize a separate device to vaporize methanol~ The current cost of such devices is quite high, and of course extra electrical or other high priced energy must be provided in order to accomplish the vaporization.
Of course, pure hydrogen could also be provided to the furnace, but at the present time such a proposal is uneconomical compared to methanol.
GENERAL DESCRIPTION OF THIS INVENTION
.
In view of the foregoing problems with conventional ~ethods of proYiding a reducing atmosphere in a furnace of the kind under discussion, a method has been developed of vaporizing methanol without requiring additlonal electr~cal or other energy for khe vaporization, the method being one which simply utilizes waste heat already provided by the furnace itself.
It is not enough simply to pass the methanol through a conduit which receives the waste heat from the furnace. A sustained temperature above 60~C is re~uired for 100% methanol.
The essence of the invention relies on a recognition that Dalton's law o~ partial pressure permits, in effect, a lowering of the vaporization temperature of methanol when it comprises only a fraction of a mixture in which the other component is gaseous. Thus, for a mixture in which methanol is present at between 10~ and 20~, a temperature between 15C and 30C will suffice to rapidly vaporize all of the methanol. When the mixture consists of 60~ methanol, temperatures in the region of 50C are required. Specifically, nitrogen utilized as the gaseous component of the mix~ure and liquid ,;
.
3~
methanol is passed along with the nitrogen through a conduit, preferably copper heated in heat-transfer contact with a wall of the furnace through which waste heat passes.
For example, in a continuous brazing furnace operation a gas flow of 2,000 cubic feet per hour at atmospheric pressure is required. If the mixture consists of 20~ methanol approx;mately 5,500 BTU/hour of heat is needed for vaporization. If this heat is obtained from the waste heat of the furnace itself instead of from anelectrically heated sparger, considerable savings are achieved.
It is therefore an object of one aspect of this invention to provide a method of providing methanol within a metal processing furnace or the like which methanol comprises the steps of:
a) passing a mixture of liquid methanol and gaseous nitrogen through a conduit which is in heat transfer relationship with the waste heat from said furnace whereby the waste heat vaporizes the methanol into the nitrogen, and b) injecting the nitrogen and methanol gas into the furnace.
It is an object of another aspect of this invention to provide a furnace for metallic objects in a reducing atmosphere comprising:
20 a) an open ended furnace body having walls through which waste heat passes from a heat source within said body, b) a conveyor belt passing through said furnace, c) a conduit connected at i~s ups~ream end ~o a source of li~uid methanol and gaseous nitrogen and to at least one lnjection inlet in the Furnace wall at its downstream end, d) a portion of sa~d conduit posi~ioned in clost proximity ~o the wast heat from said furnace wall whereby the liquid methanol is vaporized into the nitrogen prior to injection into the furnace.
GENERAL DESCRIPTION OF THE DRAWINGS
The single figure is a schematic representation of a furnace with the methanol vaporization system of this invention installed.
DETAILE~ DESCRlPTION OF THE DRAWINGS
In the figure, a furnace 10 is shown in plan view. The furnace includes a vestibule 12 for entry of parts intented to pass through the furnace 10. A transition portion 14 is a typical part of such furnaces, and may have a round or rectangular cross-section.
The transition portion 14 incorporates a wall or walls through which waste heat from the furnace 10 passes.
. ., ~7~3!7;~
Wrapped around the transition portion 14 are two distinct coils 16 and 18 of copper pipe. The length of the coils is not critical, since it depends on the pipe diameter and the flow of methanol. As an example, however, the coi1s may each be about lO0 feet of 3/8" or l/2" tubing. A combined length of at least 150 feet and a diameter of 1/2" usually performs satisfactorily. The copper pipe thus constitutes a conduit in heat-trans~er relationship with the walls of the transition portion 14 through which waste heak passes, and therefore picks up waste heat from this region. The upstream ends of the two coils 16 and 18 come together at a "T" 20 and connect with a single conduit 22 from a control panel 24, the control panel hav1ng the capability of metering nitrogen and methanol into the upstream end 26 of the conduit 22. At the downstream end of coil 16 is an access fitting 28 which allows the mixture of nitrogen and vaporized methanol to enter the furnace at one side. A similar fitting 30 is provided for the coil 18 at the other side of the furnace. Downstream of hot zone 31 is an elongated cool down zone 32. A portion of conveyor belt 33 is shown at the discharge end of the furnace for removing the metal objects from the furnace.
Another means of heat transfer involves using the waste heat of the cooling water from the furnace cooling pipes. In normal brazing furnace operations the cooling water would be at approximately 60~C. Since the heat transfer relat~onsh1p between the methanol/nitrogen coil and the cooling water pipes is more efflcicnt than between the coll and the furnace wall, a short coil can be used between "T" 20 and access fitting 28.
It is quite satisfactory to operate the system at atmosphere, or at a pressure only sllghtly above atmosphere in order to cause the mixture to travel through the coils. However, the high pressures conventionally used for nitrogen sparging are not required~
A built-in safety feature is incorporated into the system in addition to the fact that the system is operated at substantially atmospheric pressure. Specifically, an energized-open solenoid is used for the methanol and the nitrogen entry into the conduit 22, so that upon power failure or induced power failure by safe~y interlocks the solenoid will close and the methanol and nitrogen feed will cease. At the same time, there is provided a parallel feed of nitrogen alone into the pipe, with a solenoi~ that is energized-closed. This ensures that, upon power failure. The furnace will be purged with n~trogen, and that no further methanol will enter it.
. .
. ~ .,: .
It will thus be appreciated ~hat I have provided a me~hod and apparatus by which a furnace can be furnished with a reducing atmosphere, without requiring the considerable expense involved in purchasing a separate methanol vaporizor unit, and without drawing away active heat from the interior of the furnace. The method of apparatus I have proposed utilize only waste heat, and furthermore avoid the problems created by the presence of liquid methanol droplets within the furnace. As indicated earlier, these droplets and the associated high velocity nitrogen can disrupt the furnace atmosphere9 lead to higher a~mosphere consu~ption, and cause changes in flow rate that can upset furnace performance. Also, the high alloy material of the conveying belt ~ould be destroyed if droplets were to contact it. A further problem with sparging is that it can create cold spots in the furnace.
It will be appreciated that the method of this invention could also employ other inert or near-inert gases in place of nitrogen, for example argon or helium. However, at the present time nitrogen appears to be the least expensive of the suitable gases available.
For a carburizing furnace, it is appropriate to use a mixture of gases containing approximately 60~ methanol, thus requiring a somewhat higher temperature of vaporization. The me~hanol gives CO
and H2 upon cracking within the furnace If it is des~red to slow the velocity of the yaseous mixture out of the colls 16 and 18 where they enter at the access fixtures 28 and 30, the copper piping can be expanded to a larger diameter, ~or example from 1/2" to 1".
While one embod~ment of this invention has been illustrated in the accompanying drawings, and described hereinabove, it will be evident to those skilled in the art that changes and modifications , 30 may be made therein, without departing from the essence of this invention as set forth in the appended claims.
Claims (10)
1. A method of providing vaporized methanol within a metal processing furnace or the like which method comprises the steps of:
a) passing a mixture of liquid methanol and gaseous nitrogen through a conduit which is in heat transfer relationship with the waste heat from said heat treating furnace whereby the waste heat vaporizes the methanol into the nitrogen, and b) injecting the nitrogen and methanol gas into the furnace.
a) passing a mixture of liquid methanol and gaseous nitrogen through a conduit which is in heat transfer relationship with the waste heat from said heat treating furnace whereby the waste heat vaporizes the methanol into the nitrogen, and b) injecting the nitrogen and methanol gas into the furnace.
2. A method as claimed in Claim 1 wherein the metal processing furnace is a continuous brazing, neutral hardening, annealing or sintering furnace and the said mixture injected into the furnace consists of from 5 percent to 30 percent methanol, both the methanol and nitrogen being substanially at atmospheric pressure.
3. A method as claimed in Claim 1 wherein the metal processing furnace is a carburizing furnace and the said mixture consists of from 50 percent to 70 percent methanol, and the remainder being nitrogen, both the methanol and nitrogen being substantially at atmospheric pressure.
4. A method of providing vaporized methanol within a metal processing furnace or the like which method comprises the steps of:
a) passing metallic objects on a conveyor belt through an open ended furnace, said furnace having a vestibule portion at the upstream end of said conveyor, a transition zone downstream of said vestibule and a heating zone downstream of said transition zone, b) passing a mixture of liquid methanol and gaseous nitrogen through a conduit which is in heat transfer relationship with the waste heat from the transition zone of said heat treating furnace whereby said waste heat vaporizes the methanol into the nitrogen, and c) oxidizing the metal objects prior to their removal from said furnace.
a) passing metallic objects on a conveyor belt through an open ended furnace, said furnace having a vestibule portion at the upstream end of said conveyor, a transition zone downstream of said vestibule and a heating zone downstream of said transition zone, b) passing a mixture of liquid methanol and gaseous nitrogen through a conduit which is in heat transfer relationship with the waste heat from the transition zone of said heat treating furnace whereby said waste heat vaporizes the methanol into the nitrogen, and c) oxidizing the metal objects prior to their removal from said furnace.
5. A method as claimed in Claim 4 wherein the mixture of liquid methanol and gaseous nitrogen is passed through a conduit which is aligned in heat transfer relationship with cooling water bearing waste heat from the furnace whereby said waste heat vaporizes the methanol into the nitrogen.
6. A method as claimed in Claims 4 or 5 wherein the nitrogen and methanol vapor is injected into the heat treating zone at two or more points in the furnace wall perpendicular to the direction of travel of said metal objects.
7. A furnace for treating metallic objects in a reducing atmosphere comprising:
a) an open ended furnace body having walls through which waste heat passes from a heat source within said body, b) a conveyor belt passing through said furnace, c) a conduit connected at its upstream end to a source of liquid methanol and gaseous nitrogen and to at least one injection inlet in the furnace wall at its downstream end, d) a portion of said conduit positioned in close proximity to the waste heat from said furnace whereby the liquid methanol is vaporized into the nitrogen prior to injection into the furnace.
a) an open ended furnace body having walls through which waste heat passes from a heat source within said body, b) a conveyor belt passing through said furnace, c) a conduit connected at its upstream end to a source of liquid methanol and gaseous nitrogen and to at least one injection inlet in the furnace wall at its downstream end, d) a portion of said conduit positioned in close proximity to the waste heat from said furnace whereby the liquid methanol is vaporized into the nitrogen prior to injection into the furnace.
8. A furnace as claimed in Claim 7 wherein the conduit is connected at its downstream end to two injection inlets at opposite ends in the furnace wall whereby the methanol and nitrogen mixture is injected into the furnace tangential to the direction of travel of the said conveyor belt.
9. A furnace as claimed in Claim 8 wherein the portion of the conduit in close proximity to the waste heat from the furnace wall is wrapped around the transition zone immediately upstream from the heating zone of the furnace.
10. A furnace as claimed in Claims 7 or 8 wherein the portion of said conduit positioned in close proximity to the waste heat of the furnace is aligned in heat transfer relationship with cooling water bearing waste heat from the furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000502487A CA1270732A (en) | 1986-02-21 | 1986-02-21 | Methanol vaporization of metal processing furnaces and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000502487A CA1270732A (en) | 1986-02-21 | 1986-02-21 | Methanol vaporization of metal processing furnaces and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1270732A true CA1270732A (en) | 1990-06-26 |
Family
ID=4132527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000502487A Expired CA1270732A (en) | 1986-02-21 | 1986-02-21 | Methanol vaporization of metal processing furnaces and the like |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1270732A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109439869A (en) * | 2018-11-14 | 2019-03-08 | 苏州工业园区姑苏科技有限公司 | A kind of methanol dropping gasification installation of Equipment for Heating Processing |
-
1986
- 1986-02-21 CA CA000502487A patent/CA1270732A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109439869A (en) * | 2018-11-14 | 2019-03-08 | 苏州工业园区姑苏科技有限公司 | A kind of methanol dropping gasification installation of Equipment for Heating Processing |
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| MKLA | Lapsed |