CA1173778A - Arrangement for minimizing leakage from heated chambers and method for making same - Google Patents
Arrangement for minimizing leakage from heated chambers and method for making sameInfo
- Publication number
- CA1173778A CA1173778A CA000348349A CA348349A CA1173778A CA 1173778 A CA1173778 A CA 1173778A CA 000348349 A CA000348349 A CA 000348349A CA 348349 A CA348349 A CA 348349A CA 1173778 A CA1173778 A CA 1173778A
- Authority
- CA
- Canada
- Prior art keywords
- substance
- sealing means
- heated chamber
- opening
- sodium silicate
- 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
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B25/00—Doors or closures for coke ovens
- C10B25/02—Doors; Door frames
- C10B25/16—Sealing; Means for sealing
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Sealing Material Composition (AREA)
- Coke Industry (AREA)
- Furnace Details (AREA)
Abstract
Abstract of the Disclosure A closure for a heated chamber, specifically a coke oven door, such as a Koppers or Wilputte door, is provided with a secondary sealing means consisting of a substance that is applied to the mating surfaces and expands upon being heated. The substance may comprise an intumescent mixture of sodium silicate and glass.
Description
~1~3778 ARRANGEMENT FOR MINIMIZING LEAKAGE FROM HEATED CHAMBERS
AND METHOD FOR MAKING SA~E __ _ _ _ SPECIFICATION
. . .
TO ALL WHOM IT MAY CONCERN
Be it known, that I, JOSEPH M. EVANS, a citizen of the United States and a resident of Murrysville, in the County of Westmoreland and the Commonwealth of Pennsylvania, have invented new and useful improvements in Arrangement for Minimizing Leakage from Heated Chamber and Method for Making Same by which this is a Specification.
BACKGROU D OF THE INVENTION
FIELD OF THE 'INVENTI'ON
This invention relates generally to sealing arrangements and method of making same, and more particularly, sealing arrangements for heated chambers and methods for making sameG
It is well known especially from Environmental Reports and the news media tha-t the sealing of ovens which produce noxious fumes, smoke, dust, etc., is a difficult ar-t. Only recently the coke industry in the major steel producing area of the United States has been threatened with a complete shutdown because of its inability to comply with the new Environmental Regulations of the Invironmental Protection Agency of the United States of ~merica and the Department of ~nvironmental Resources of the Commonwealth of Pennsylvania.
An example of a coke oven which presently has sealing problems~ is a coke oven with a so-called Koppers Door. The coke oven with the ICoppers Door utilizes an S-shaped seal for sealing the door against the jamb of the oven. Because of ~k , ~ .
.
7~778 irregularities in the jamb and seal, gases from within the coke oven readily leak past the jamb. In cases where the seal has been damaged by loading and unloading of coal and coke, gouges occur therein, which greatly increase the flow of noxious gases and fumes from the coke oven to the surrounding air. This leakage from damaged ovens is especially undesirable since the degree of pollution caused thereby is many fold that of an oven in preferred condition. However, during long use coke ovens are damaged by the constant loading and unloading and seal cleaning, therefore, a larger and larger percentage of the ovens leak at ever increasing rates.
Another door widely used in the coke industry is the Wilputte Door. The Wilputte Door has a diaphragm seal and a jamb with an adjustable screw for making contact more readily between the jamb and the door. The Wilputte Door also suffers from the same sort of problems that the Koppers Door does. A
great need is also felt for an improved sealing arrangement therein R~cent tests have shown that many of the~e doors in present operation in their present configurations do not permit operation within the guidelines set by the Department of Environmental Resources and the Environmental Protection Agency.
The fact of the lack of capability of meeting these requirements is well known and has threatened to shut down the steel industry for lack of coke. Therefore, a great need is felt for an improved door sealing arrangement which would permit operation within the guidelines of the Environmental Protection Agency of the Department of Environmental Resources.
There are a great number of other applications where .~. , -73~77~
leakage Erom ovens and other heated chambers can be cured byuse of my invention such as soaking pits, used for the soaking of iron ingots during the manufacture of iron and steel, furnaces and other examples which are too numerous to mention herein.
DESCRIPTION OF THE PRIOR ART AND RESULTS OF NOVELTY SEARCH
A means of attempting to seal a coke oven is disclosed in U.S. Patent No: 3,875,018 to Calderon in which a collodial mixture is injected into a passage from which it leaks out in such a way that during the coking cycle the:miXture becomes gummy and sticky for sealing crevices between the door and the jamb.
The mixture dehydrates and develops non-wetting and non-adhering properties by hardening into a strong solid mass. This method requires a special door design which incorporated channels for receiving the mixture. Problems have been discovered in the injection of the mixture into the channel because the mixture has a tendency to leak out of the channel and past the seal before it has an opportunity to harden sufficiently.
The novelty search conducted prior to the preparation of this application turned up U.S. Patent No: 2,279,791, which does not form the prior art but only teaches the application of a material which expands when subjected to elevated temperatures.
This material is used to coat the individual wires of a fire screen. The fire screen thus coated, when exposed to elevated temperatures causes the material to expand. The expansion closes the openings between the individual wires of the screen, thereby restricting the flow of air at these elevated temperatures through the fire screen.
' '`'. ~ "
7;3~7~3 Another result of the novelty search is U. S. Patent No. 3,81~,613 which discloses the use of a refractory composition for patching the walls of a coke oven. This refractory composition comprises siliceous aggregate, plastic clay, a chemical binder such as sodium silicate, chromic acid, boric acid, sodium sulfate, magnesium sulfate, sodium phosphate and organic binders and finall~, a source of maganese dioxide. The patching material may be applied by the trowelling or plastering over a cracked area in the ~all of the coke oven or by pumping or i-njecting the material into cracks in the wall or by pneumatically gunning. This patent has the object of providing a patching material for coke ovens which has a long lasting bond with used silica brick.
Summary of the Invention i In accordance with the present invention there is provided a heated chamber having at least one opening; closure means for closing said at least one opening, said closure means having at least a closed and open position; said closure means and said opening having surfaces disposed for coming into proximity of one another in said closed position, said surfaces forming a primary sealing means for said heated chamber in said closed position, there being a substance comprising a liquid silicate applied to at least one of said proximate surfaces, said substance being an intumescent substance, that is to say, foaming and expanding upon the application of heat, thereby 25 forming a secondary sealing means between said proximate -surfaces in said closed position, when said substance is in a foamed and expanded condition.
~737~
Also in accordance with the invention there is provided a method of sealing a heated chamber having at least one opening with closure means therefor, said closure means forming a primary sealing means for said chamber, comprising the steps of: applying an intumescent substance, that is to say a substance which foams and expands upon heating, to at least one surface between said at least one opening and said closure means, said substance on foaming and expanding, forming a secondary sealing means for said chamber, said substance co~prising a liquid silicate.
The said substance may comprise sodium silicate, and may comprise a mixture of sodium silicate and glass.
Thus, the present invention relates to the sealing of heated chambers from which gases, fumes and other noxious materials may escape. These chambers have at least one opening therein for receiving contents to be processed therein in some manner. This opening has préferably some sort of closing element for the gross sealing thereof from the surrounding atmosphere. This element may be a door. This door has a primary seal for making at least a rudimentary seal between the door and the jamb which reduces the leakage of gases, fumes and other noxious materials from the chamber to the surrounding environment. In addition to the primary seal, a secondary seal is provided which is placed or disposed in such a way as to enhance the sealing function of the primary seal.
In addition, this secondary seal if made from a material which changes dimensions such as to expand when exposed to heat and preferably expands to complement or surround the primary seal, - 4a .
. ~............ .
, ~ ' , ' ~
' ' ~37~
thereby, grea-tly improving the ability of the primary seal to contain the gases, fumes and other noxious materials.
This secondary sealing means is preferably applied in a liquid state and may comprise a material such as liquid sodium silicate which provides a sealing capability which improves as the temperature rises because of its property to expand when heated.
The sealing mixture or medium may be formed by mixing an intumescent material such as sodium silicate to a desired viscosity which when applied at temperatures before the chamber is heated will permit an accumulation thick enough to surround the primary seal when making a seal against the jamb, upon the closing of the oven door.
Brief Description of the Drawings Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, wherein:-FIGURE 1 is a cross-sectional view of a Koppers oven door having an S shaped seal and a jamb according to the prior art;
FIGURE 2 illustrates the invention applied to the Koppers oven door of Figure l;
FIGURE 3 is a cross-sectional view of a Wilputte door according to the prior art;
FIGURE 4 illustrates the invention applied to the Wilputte door of Figure 3;
FIGURE 5 is a three dimensional view of a segment of an S shaped seal showing gas leakage gaps as in the prior art; and . , --7~t~8 Figure 6 illustrates the present invention applied in Figure 5.
DETAILED DESCRIPTION OF THE DRAWINGS
. .
Referring now to Figure 1, oven walls 10 are shown with flues 12 therein. ~buttiny the walls are jambs 14. ~aking contact with the jambs 14 are S shaped seals.
Plungers 18 have springs 20 for urging the S shaped seals against the jambs 14~ The opposite ends of the S shaped seals 16, not making contact with the jambs 14, abut a door frame 22 which has a latch 24 for opening, closing, and locking the door. Also attached to the door frame 22 are retainers 26 which hold a plug 28 there between. A brickstay 30 abuts the jambs 14 on the sides opposite the oven walls 10.
Referring now to Figure 2, a partial cross section of the Koppers door of Figure l, is shown having one of the S shaped seals 16, one of the door jambs 14 and the plug 28. In the area of the jamb 14 onto which the S shaped seal 16 abuts an intumescent material 110 is applied. The intumescent material expands upon exposure to the elevated temperature during the making of coke. This expansion provides a gas-tight seal between the jamb 14 and the S shaped seal 16.
As an alternative embodiment also shown in Figure 2 between the plug 28 and the oven wall 10 a mass of intumescent material 112 is applied. This mass of intumescent material 112 has the same function as the intumescent 110, and will expand upon exposure to elevated temperatures.
If there are any gouges or cracks or other irregularities in the jamb 14 or as in the alternative embodiment as shown in this same Figure 2 in the oven wall 10, the intumescent material either 110 or 112, as the case may be, will fill these ~; _ - - .
, gouges, cracks, or other irregularities both upon application and subsequent thereto, during expansion in the heating process and form an ext~emely efficient even under these adverse conditions where the primary seal, the S shaped seal 16 is not operative satisfactorily.
Figure 3 is similar to Figure 1, in that it shows a prior art Wilputte door instead of a Koppers door. Moreover, it has a similar jamb 214 with a diaphragm seal 216 which makes contact with the jamb 214. The Wilputte door has a plug 218 similar to the Koppers door of Figure 1~
Figure 4 shows the placement of an intumescent material 310 with a diaphragm seal 216 and the jamb 214 as shown in Fig. 3.
Also in Figure 4 an alternative embodiment of the Wilputte door according to the present invention is shown, that is, between the oven wall 10 and the plug 218 another body of intumescent material 312 is placed for the sealing of the opening there between.
The intumescent material may be a polverant cellulatable glass such as ground glass with a high carbon content mixed with silicate and a clay. The clay is believed to be preferrably ball clay or china clay which are used because of their fine texture.
Another formulation of intumescent material which has been shown to be satisfactory is liquid sodium silicate having a viscosity of 400 centipoise when blended. The liquid sodium silicate is preferrably applied directly to the horizontal surfaces with a pressurized spray gun which produces a fine atomized discharge such as a portable pressurized sprayer. The material sprayed on the horizontal surfaces may also be sprayed with a pressurized spray gun which produces a finely atomized .
.
71~
discharge and permitted to coat these surfaces to a thickness of about ten-thousandths of an inch in one pass or, yet more preferrably, in two passes to a thickness of twenty-thousandths of an inch. It has been shown that there is little or no running of the material when applied in this manner. The sodium silicate adheres to the oven and will produce a seal upon the application of heat to the intrumescent material which has the property in its present form of enlarging or expanding upon being heated thereby making a good seal. On vertical surfaces the liquid sodium silicate is preferrably blended to a viscosity of approximately 950 centipoise or combined with granular sodium silicate to achieve higher viscosities and thixa tropic behavlor and applied to a heated surface at or above 100C. In certain applications other materials may be added to the liquid sodium silicate such that it will more readily adhere to vertical surfaces and inhibit the tendency to run thereon.
The applicant has found that a viscosity of between 400 to 950 centipoise is adequate for the applications that he has investigated. However, even lower viscosities may be adequate and can be determined by experimentation. The applicant also believes that mixtures having viscosity which decrease as the shear rate increases will reduce the tendency of the sealer to run off the surface after it has been applied thereto. Other methods of applying the liquid sodium silicate or other materials having intumescent materials may be by the formation of a gasket, the application of the mixture with a brush or any other applic-able method, even aerosol sprays may be useful under certain sets of circumstances and conditions. The applicant has additionally found that mixture may be applied to the goose neck portion of a coke oven to effectively seal it as well as a door.
: .
.
AND METHOD FOR MAKING SA~E __ _ _ _ SPECIFICATION
. . .
TO ALL WHOM IT MAY CONCERN
Be it known, that I, JOSEPH M. EVANS, a citizen of the United States and a resident of Murrysville, in the County of Westmoreland and the Commonwealth of Pennsylvania, have invented new and useful improvements in Arrangement for Minimizing Leakage from Heated Chamber and Method for Making Same by which this is a Specification.
BACKGROU D OF THE INVENTION
FIELD OF THE 'INVENTI'ON
This invention relates generally to sealing arrangements and method of making same, and more particularly, sealing arrangements for heated chambers and methods for making sameG
It is well known especially from Environmental Reports and the news media tha-t the sealing of ovens which produce noxious fumes, smoke, dust, etc., is a difficult ar-t. Only recently the coke industry in the major steel producing area of the United States has been threatened with a complete shutdown because of its inability to comply with the new Environmental Regulations of the Invironmental Protection Agency of the United States of ~merica and the Department of ~nvironmental Resources of the Commonwealth of Pennsylvania.
An example of a coke oven which presently has sealing problems~ is a coke oven with a so-called Koppers Door. The coke oven with the ICoppers Door utilizes an S-shaped seal for sealing the door against the jamb of the oven. Because of ~k , ~ .
.
7~778 irregularities in the jamb and seal, gases from within the coke oven readily leak past the jamb. In cases where the seal has been damaged by loading and unloading of coal and coke, gouges occur therein, which greatly increase the flow of noxious gases and fumes from the coke oven to the surrounding air. This leakage from damaged ovens is especially undesirable since the degree of pollution caused thereby is many fold that of an oven in preferred condition. However, during long use coke ovens are damaged by the constant loading and unloading and seal cleaning, therefore, a larger and larger percentage of the ovens leak at ever increasing rates.
Another door widely used in the coke industry is the Wilputte Door. The Wilputte Door has a diaphragm seal and a jamb with an adjustable screw for making contact more readily between the jamb and the door. The Wilputte Door also suffers from the same sort of problems that the Koppers Door does. A
great need is also felt for an improved sealing arrangement therein R~cent tests have shown that many of the~e doors in present operation in their present configurations do not permit operation within the guidelines set by the Department of Environmental Resources and the Environmental Protection Agency.
The fact of the lack of capability of meeting these requirements is well known and has threatened to shut down the steel industry for lack of coke. Therefore, a great need is felt for an improved door sealing arrangement which would permit operation within the guidelines of the Environmental Protection Agency of the Department of Environmental Resources.
There are a great number of other applications where .~. , -73~77~
leakage Erom ovens and other heated chambers can be cured byuse of my invention such as soaking pits, used for the soaking of iron ingots during the manufacture of iron and steel, furnaces and other examples which are too numerous to mention herein.
DESCRIPTION OF THE PRIOR ART AND RESULTS OF NOVELTY SEARCH
A means of attempting to seal a coke oven is disclosed in U.S. Patent No: 3,875,018 to Calderon in which a collodial mixture is injected into a passage from which it leaks out in such a way that during the coking cycle the:miXture becomes gummy and sticky for sealing crevices between the door and the jamb.
The mixture dehydrates and develops non-wetting and non-adhering properties by hardening into a strong solid mass. This method requires a special door design which incorporated channels for receiving the mixture. Problems have been discovered in the injection of the mixture into the channel because the mixture has a tendency to leak out of the channel and past the seal before it has an opportunity to harden sufficiently.
The novelty search conducted prior to the preparation of this application turned up U.S. Patent No: 2,279,791, which does not form the prior art but only teaches the application of a material which expands when subjected to elevated temperatures.
This material is used to coat the individual wires of a fire screen. The fire screen thus coated, when exposed to elevated temperatures causes the material to expand. The expansion closes the openings between the individual wires of the screen, thereby restricting the flow of air at these elevated temperatures through the fire screen.
' '`'. ~ "
7;3~7~3 Another result of the novelty search is U. S. Patent No. 3,81~,613 which discloses the use of a refractory composition for patching the walls of a coke oven. This refractory composition comprises siliceous aggregate, plastic clay, a chemical binder such as sodium silicate, chromic acid, boric acid, sodium sulfate, magnesium sulfate, sodium phosphate and organic binders and finall~, a source of maganese dioxide. The patching material may be applied by the trowelling or plastering over a cracked area in the ~all of the coke oven or by pumping or i-njecting the material into cracks in the wall or by pneumatically gunning. This patent has the object of providing a patching material for coke ovens which has a long lasting bond with used silica brick.
Summary of the Invention i In accordance with the present invention there is provided a heated chamber having at least one opening; closure means for closing said at least one opening, said closure means having at least a closed and open position; said closure means and said opening having surfaces disposed for coming into proximity of one another in said closed position, said surfaces forming a primary sealing means for said heated chamber in said closed position, there being a substance comprising a liquid silicate applied to at least one of said proximate surfaces, said substance being an intumescent substance, that is to say, foaming and expanding upon the application of heat, thereby 25 forming a secondary sealing means between said proximate -surfaces in said closed position, when said substance is in a foamed and expanded condition.
~737~
Also in accordance with the invention there is provided a method of sealing a heated chamber having at least one opening with closure means therefor, said closure means forming a primary sealing means for said chamber, comprising the steps of: applying an intumescent substance, that is to say a substance which foams and expands upon heating, to at least one surface between said at least one opening and said closure means, said substance on foaming and expanding, forming a secondary sealing means for said chamber, said substance co~prising a liquid silicate.
The said substance may comprise sodium silicate, and may comprise a mixture of sodium silicate and glass.
Thus, the present invention relates to the sealing of heated chambers from which gases, fumes and other noxious materials may escape. These chambers have at least one opening therein for receiving contents to be processed therein in some manner. This opening has préferably some sort of closing element for the gross sealing thereof from the surrounding atmosphere. This element may be a door. This door has a primary seal for making at least a rudimentary seal between the door and the jamb which reduces the leakage of gases, fumes and other noxious materials from the chamber to the surrounding environment. In addition to the primary seal, a secondary seal is provided which is placed or disposed in such a way as to enhance the sealing function of the primary seal.
In addition, this secondary seal if made from a material which changes dimensions such as to expand when exposed to heat and preferably expands to complement or surround the primary seal, - 4a .
. ~............ .
, ~ ' , ' ~
' ' ~37~
thereby, grea-tly improving the ability of the primary seal to contain the gases, fumes and other noxious materials.
This secondary sealing means is preferably applied in a liquid state and may comprise a material such as liquid sodium silicate which provides a sealing capability which improves as the temperature rises because of its property to expand when heated.
The sealing mixture or medium may be formed by mixing an intumescent material such as sodium silicate to a desired viscosity which when applied at temperatures before the chamber is heated will permit an accumulation thick enough to surround the primary seal when making a seal against the jamb, upon the closing of the oven door.
Brief Description of the Drawings Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, wherein:-FIGURE 1 is a cross-sectional view of a Koppers oven door having an S shaped seal and a jamb according to the prior art;
FIGURE 2 illustrates the invention applied to the Koppers oven door of Figure l;
FIGURE 3 is a cross-sectional view of a Wilputte door according to the prior art;
FIGURE 4 illustrates the invention applied to the Wilputte door of Figure 3;
FIGURE 5 is a three dimensional view of a segment of an S shaped seal showing gas leakage gaps as in the prior art; and . , --7~t~8 Figure 6 illustrates the present invention applied in Figure 5.
DETAILED DESCRIPTION OF THE DRAWINGS
. .
Referring now to Figure 1, oven walls 10 are shown with flues 12 therein. ~buttiny the walls are jambs 14. ~aking contact with the jambs 14 are S shaped seals.
Plungers 18 have springs 20 for urging the S shaped seals against the jambs 14~ The opposite ends of the S shaped seals 16, not making contact with the jambs 14, abut a door frame 22 which has a latch 24 for opening, closing, and locking the door. Also attached to the door frame 22 are retainers 26 which hold a plug 28 there between. A brickstay 30 abuts the jambs 14 on the sides opposite the oven walls 10.
Referring now to Figure 2, a partial cross section of the Koppers door of Figure l, is shown having one of the S shaped seals 16, one of the door jambs 14 and the plug 28. In the area of the jamb 14 onto which the S shaped seal 16 abuts an intumescent material 110 is applied. The intumescent material expands upon exposure to the elevated temperature during the making of coke. This expansion provides a gas-tight seal between the jamb 14 and the S shaped seal 16.
As an alternative embodiment also shown in Figure 2 between the plug 28 and the oven wall 10 a mass of intumescent material 112 is applied. This mass of intumescent material 112 has the same function as the intumescent 110, and will expand upon exposure to elevated temperatures.
If there are any gouges or cracks or other irregularities in the jamb 14 or as in the alternative embodiment as shown in this same Figure 2 in the oven wall 10, the intumescent material either 110 or 112, as the case may be, will fill these ~; _ - - .
, gouges, cracks, or other irregularities both upon application and subsequent thereto, during expansion in the heating process and form an ext~emely efficient even under these adverse conditions where the primary seal, the S shaped seal 16 is not operative satisfactorily.
Figure 3 is similar to Figure 1, in that it shows a prior art Wilputte door instead of a Koppers door. Moreover, it has a similar jamb 214 with a diaphragm seal 216 which makes contact with the jamb 214. The Wilputte door has a plug 218 similar to the Koppers door of Figure 1~
Figure 4 shows the placement of an intumescent material 310 with a diaphragm seal 216 and the jamb 214 as shown in Fig. 3.
Also in Figure 4 an alternative embodiment of the Wilputte door according to the present invention is shown, that is, between the oven wall 10 and the plug 218 another body of intumescent material 312 is placed for the sealing of the opening there between.
The intumescent material may be a polverant cellulatable glass such as ground glass with a high carbon content mixed with silicate and a clay. The clay is believed to be preferrably ball clay or china clay which are used because of their fine texture.
Another formulation of intumescent material which has been shown to be satisfactory is liquid sodium silicate having a viscosity of 400 centipoise when blended. The liquid sodium silicate is preferrably applied directly to the horizontal surfaces with a pressurized spray gun which produces a fine atomized discharge such as a portable pressurized sprayer. The material sprayed on the horizontal surfaces may also be sprayed with a pressurized spray gun which produces a finely atomized .
.
71~
discharge and permitted to coat these surfaces to a thickness of about ten-thousandths of an inch in one pass or, yet more preferrably, in two passes to a thickness of twenty-thousandths of an inch. It has been shown that there is little or no running of the material when applied in this manner. The sodium silicate adheres to the oven and will produce a seal upon the application of heat to the intrumescent material which has the property in its present form of enlarging or expanding upon being heated thereby making a good seal. On vertical surfaces the liquid sodium silicate is preferrably blended to a viscosity of approximately 950 centipoise or combined with granular sodium silicate to achieve higher viscosities and thixa tropic behavlor and applied to a heated surface at or above 100C. In certain applications other materials may be added to the liquid sodium silicate such that it will more readily adhere to vertical surfaces and inhibit the tendency to run thereon.
The applicant has found that a viscosity of between 400 to 950 centipoise is adequate for the applications that he has investigated. However, even lower viscosities may be adequate and can be determined by experimentation. The applicant also believes that mixtures having viscosity which decrease as the shear rate increases will reduce the tendency of the sealer to run off the surface after it has been applied thereto. Other methods of applying the liquid sodium silicate or other materials having intumescent materials may be by the formation of a gasket, the application of the mixture with a brush or any other applic-able method, even aerosol sprays may be useful under certain sets of circumstances and conditions. The applicant has additionally found that mixture may be applied to the goose neck portion of a coke oven to effectively seal it as well as a door.
: .
.
Claims (16)
1. A heated chamber having at least one opening; closure means for closing said at least one opening, said closure means having at least a closed and open position; said closure means and said opening having surfaces disposed for coming into proximity of one another in said closed position, said surfaces forming a primary sealing means for said heated chamber in said closed position, there being a substance comprising a liquid silicate applied to at least one of said proximate surfaces, said substance being an intumescent substance, that is to say, foaming and expanding upon the application of heat, thereby forming a secondary sealing means between said proximate surfaces in said closed position, when said substance is in a foamed and expanded condition.
2. A heated chamber according to claim 1, wherein said substance comprises sodium silicate.
3. A heated chamber according to claim 1, wherein said substance, when applied, has a viscosity between 400 and 950 centipoise (M Pa s).
4. A heated chamber according to claim 1 or 2, wherein said substance is a mixture comprising sodium silicate and glass.
5. A heated chamber according to any one of claims 1, 2 or 3, wherein said primary sealing means has voids therein permitting gases to leak therethrough, the substance forming the secondary sealing means having properties of adhering to at least one surface of said at least one opening or said closure means, said secondary sealing means being disposed in relationship with said primary sealing means such that upon application of heat, said sealing means foams and expands and at least partially fills a portion of said voids in said primary sealing means whereby sealing of said heated chamber is enhanced.
6. A heated chamber according to claim 1 or 2, wherein said substance is a mixture comprising sodium silicate and glass, and wherein said primary sealing means has voids therein permitting gases to leak therethrough, the substance forming the secondary sealing means having properties of adhering to at least one surface of said at least one opening or said closure means, said secondary sealing means being disposed in relationship with said primary sealing means such that upon application of heat, said sealing means foams and expands and at least partially fills a portion of said voids in said primary sealing means whereby sealing of said heated chamber is enhanced.
7. A method of sealing a heated chamber having at least one opening with closure means therefor, said closure means forming a primary sealing means for said chamber, comprising the steps of: applying an intumescent substance, that is to say a substance which foams and expands upon heating, to at least one surface between said at least one opening and said closure means, said substance on foaming and expanding, forming a secondary sealing means for said chamber, said substance comprising a liquid silicate.
8. A method as claimed in claim 7, wherein said substance comprises sodium silicate.
9. A method as claimed in claim 7, wherein said substance is applied to said surface with the temperature of said surface bing at or above 100 degrees centigrade.
10. A method as claimed in claim 8, wherein said substance is applied to said surface with the temperature of said surface bing at or above 100 degrees centigrade.
11. A method as claimed in any one of claims 7, 8 or 9, wherein said applying is accomplished by spraying or trowelling the substance onto said at least one surface.
12. A method as claimed in any one of claims 7, 8 or 9, wherein said substance is applied at a viscosity between 400 and 950 centipoise (M Pa s).
13. A method as claimed in any one of claims 7, 8 or 9, wherein said substance is applied at a viscosity between 400 and 950 centipoise (M Pa s), and wherein said substance is applied as a layer between 10 and 20 thousandths of an inch (.0254 and 0.508 mm) in thickness.
14. A method as claimed in any one of claims 7, 8 or 9, wherein said applying is accomplished by spraying or trowelling the substance onto said at least one surface. and wherein said substance is applied at a viscosity between 400 and 950 centipoise (M Pa s).
15. A method as claimed in any one of claims 7, 8 or 9, wherein said applying is accomplished by spraying or trowelling the substance onto said at least one surface, wherein said substance is applied at a viscosity between 400 and 950 centipoise (M Pa s), and wherein said substance is applied as a layer between 10 and 20 thousandths of an inch (.0254 and 0.508 mm) in thickness.
16. A method as claimed in any one of claims 7, 8 or 9, wherein said substance is a mixture comprising sodium silicate and glass.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US2490579A | 1979-03-29 | 1979-03-29 | |
| US24,905 | 1979-03-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1173778A true CA1173778A (en) | 1984-09-04 |
Family
ID=21822958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000348349A Expired CA1173778A (en) | 1979-03-29 | 1980-03-25 | Arrangement for minimizing leakage from heated chambers and method for making same |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0017440B1 (en) |
| JP (1) | JPH0237381B2 (en) |
| CA (1) | CA1173778A (en) |
| DE (1) | DE3069620D1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5451502A (en) * | 1990-05-04 | 1995-09-19 | Oncor, Inc. | Restriction amplification assay |
| KR100341040B1 (en) * | 1994-08-18 | 2002-11-23 | 칫소가부시키가이샤 | High Rigidity Propylene-Ethylene Block Copolymer Composition and Its Manufacturing Method |
| JP6051872B2 (en) * | 2013-01-09 | 2016-12-27 | 新日鐵住金株式会社 | Coke oven mouth seal structure |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2040887A (en) * | 1931-05-04 | 1936-05-19 | Koppers Co Inc | Coke oven door |
| US2279791A (en) * | 1939-12-09 | 1942-04-14 | Detroit Air Filter Co | Fire screen |
| US3814613A (en) * | 1972-12-21 | 1974-06-04 | Steel Corp | Coke-oven patching material |
| US3875018A (en) * | 1973-01-26 | 1975-04-01 | Albert Calderon | Coke oven door with heat settable sealant |
| US4111709A (en) * | 1975-07-01 | 1978-09-05 | Coal Industry (Patents) Limited | Lute |
-
1980
- 1980-03-25 CA CA000348349A patent/CA1173778A/en not_active Expired
- 1980-03-28 JP JP3914080A patent/JPH0237381B2/en not_active Expired - Lifetime
- 1980-03-28 EP EP80300975A patent/EP0017440B1/en not_active Expired
- 1980-03-28 DE DE8080300975T patent/DE3069620D1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56881A (en) | 1981-01-07 |
| EP0017440B1 (en) | 1984-11-14 |
| DE3069620D1 (en) | 1984-12-20 |
| EP0017440A1 (en) | 1980-10-15 |
| JPH0237381B2 (en) | 1990-08-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |