US4195596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion of halogenated hydrocarbons
Assignee: Dow Chemical Co
•
Filing: 1978-09-11
•
Granted: 1980-04-01
•
Expires: 1998-09-11
Abstract
Abstract Halogenated hydrocarbon materials are burned in an internally-fired horizontal fire-tube boiler and the heat of combustion directly produces saturated steam. Halogen values may be recovered from the combustion gases, e.g., by being absorbed in water. Thus halogenated hydrocarbon material which may need to be disposed of, is beneficially converted to energy and useful product.
Inventors
- 👤 John C. Scheifley
- 👤 Clark R. Shields
- 👤 David E. Busby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:54
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/68; B01D53/70; C; C01; C01B; C01B7/00; C01B7/01; F; F22; F22B; F22B7/00; F22B7/16; F22B7/18; F23; F23G; F23G5/00; F23G5/44; F23G5/46; F23G2209/00; F23G2209/14; F23G2209/142
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
265 words
A water-cooled, horizontal fire-tube boiler having a front end section, a boiler section, and a rear end section, which comprises in combination a boiler section comprising a generally cylindrically-shaped shell having a vertically-disposed metal tube-sheet at each end, a relatively large metal combustion chamber tube extending the length of, and within, said shell and communicating through said tube-sheets, a plurality of relatively small metal return-tubes extending the length of, and within, the boiler shell and communicating through said tube-sheets, the combustion chamber tube and the return-tubes being in spaced-apart, horizontal relationship, a front end section comprising a confined space for containing combustion gases, said space communicating with said return-tubes, and having feed means extending through said confined space for feeding air, supplemental fuel, and halogenated hydrocarbons into a burner nozzle within the combustion chamber tube, a rear end section comprising a confined space for containing combustion gases, said space communicating with said combustion chamber tube and said return-tubes, the spaces contained within the front end section and the rear end section having those surfaces, except for the tube-sheet surfaces, which are exposed to the combustion gases when the boiler is in operation, made of corrosion-resistant material or covered with an amount of insulation predetermined to maintain the temperature of such surfaces within a predetermined temperature range during operation, a means for supplying water into the shell, a means for controlling steam pressure in the range of about 150 to about 275 psig and for removing steam from the top of the shell, and a means for removing combustion gases from one of the end sections.
Claim 2
Dependent Claim
265 words
A water-cooled, horizontal fire-tube boiler having a front end section, a boiler section, and a rear end section, which comprises in combination a boiler section comprising a generally cylindrically-shaped shell having a vertically-disposed metal tube-sheet at each end, a relatively large metal combustion chamber tube extending the length of, and within, said shell and communicating through said tube-sheets, a plurality of relatively small metal return-tubes extending the length of, and within, the boiler shell and communicating through said tube-sheets, the combustion chamber tube and the return-tubes being in spaced-apart, horizontal relationship, a front end section comprising a confined space for containing combustion gases, said space communicating with said return-tubes, and having feed means extending through said confined space for feeding air, supplemental fuel, and halogenated hydrocarbons into a burner nozzle within the combustion chamber tube, a rear end section comprising a confined space for containing combustion gases, said space communicating with said combustion chamber tube and said return-tubes, the spaces contained within the front end section and the rear end section having those surfaces, except for the tube-sheet surfaces, which are exposed to the combustion gases when the boiler is in operation, made of corrosion-resistant material or covered with an amount of insulation predetermined to maintain the temperature of such surfaces within a predetermined temperature range during operation, a means for supplying water into the shell, a means for controlling steam pressure in the range of about 150 to about 275 psig and for removing steam from the top of the shell, and a means for removing combustion gases from one of the end sections.
Claim 3
Dependent Claim
63 words
The horizontal fire-tube boiler of claim 1 wherein one or more corrosion-resistant baffles are employed in one or both end sections to divide the spaces within the end sections into two or more spaces which do not communicate directly with each other, each of said spaces communicating with the tubes in the boiler, thereby providing a fire-tube boiler of more than two passes.
Claim 4
Dependent Claim
18 words
The horizontal fire-tube boiler of claim 1 wherein the corrosion-resistant material is nickel or an alloy of nickel.
Claim 5
Dependent Claim
21 words
The boiler of claim 1 wherein the predetermined temperature is within the range of about 200° C. to about 250° C.
Claim 6
Dependent Claim
12 words
The boiler of claim 1 wherein the insulation is a refractory material.
Claim 7
Dependent Claim
64 words
The boiler of claim 1 wherein the boiler section contains water, at about 186° C. to about 210° C., in an amount sufficient to cover the combustion tube and the return-tubes, an amount of steam in the boiler section which is at a pressure of about 150 to about 275 psig, and a conflagrant mixture in the combustion chamber comprising oxygen and halogenated hydrocarbon.
Claim 8
Dependent Claim
20 words
The boiler of claim 6 wherein the conflagrant contains air as the oxygen source and contains a supplemental hydrocarbon fuel.
Claim 9
Dependent Claim
74 words
The boiler of any one of claims 1, 2, 3, 4, or 5 wherein the boiler section contains water, at about 186° C. to about 210° C., in an amount sufficient to cover the combustion tube and the return-tubes, an amount of steam in the boiler section which is at a pressure of about 150 to about 275 psig, and a conflagrant mixture in the combustion chamber comprising air, halogenated hydrocarbon, and supplemental fuel.
Claim 10
Independent Claim
116 words
A method for modifying a water-cooled, horizontal, fire-tube boiler built of carbon steel in which hot combustion gases are intended to come in contact with wall surfaces which are cooled by water on their reverse side and with wall surfaces which are not cooled by water on their reverse side, the said method comprising, lining the said wall surfaces which are not cooled by water on their reverse side with a predetermined amount of insulation material which prevents a large ΔT through said wall so as to maintain the wall surface which is intended to be contacted with hot combustion gases in the temperature range of about 200°-250° C. when the fire-tube boiler is in operation.
Claim 11
Independent Claim
116 words
A method for modifying a water-cooled, horizontal, fire-tube boiler built of carbon steel in which hot combustion gases are intended to come in contact with wall surfaces which are cooled by water on their reverse side and with wall surfaces which are not cooled by water on their reverse side, the said method comprising, lining the said wall surfaces which are not cooled by water on their reverse side with a predetermined amount of insulation material which prevents a large ΔT through said wall so as to maintain the wall surface which is intended to be contacted with hot combustion gases in the temperature range of about 200°-250° C. when the fire-tube boiler is in operation.
Claim 12
Dependent Claim
97 words
An improved horizontal fire-tube boiler, suitable for use for burning halogenated hydrocarbons, said boiler being built of carbon steel and having wall surfaces which are contacted by hot combustion gases and which are cooled by water or their reverse side, and wall surfaces which are not cooled by water on their reverse side, said improvement comprising, a predetermined amount of insulation covering the walls which are not cooled by water on their reverse side, to maintain said walls in the temperature range of about 200° C. to about 250° C. when the fire-tube boiler is in operation.
Claim 13
Dependent Claim
97 words
An improved horizontal fire-tube boiler, suitable for use for burning halogenated hydrocarbons, said boiler being built of carbon steel and having wall surfaces which are contacted by hot combustion gases and which are cooled by water or their reverse side, and wall surfaces which are not cooled by water on their reverse side, said improvement comprising, a predetermined amount of insulation covering the walls which are not cooled by water on their reverse side, to maintain said walls in the temperature range of about 200° C. to about 250° C. when the fire-tube boiler is in operation.
Claim 14
Dependent Claim
90 words
A process for generating saturated steam which process comprises thermally oxidizing halogenated hydrocarbons in the combustion chamber of a water-cooled, horizontal fire-tube boiler to produce heat and combustion gases, wherein heat produced is conducted directly through the tube walls into water which surrounds the tubes, said process being characterized by the saturated steam pressure being maintained in the range of about 150 to about 275 psig thereby maintaining the temperature of the water in contact with the tube walls in the range of about 186° C. to about 210° C.
Claim 15
Dependent Claim
90 words
A process for generating saturated steam which process comprises thermally oxidizing halogenated hydrocarbons in the combustion chamber of a water-cooled, horizontal fire-tube boiler to produce heat and combustion gases, wherein heat produced is conducted directly through the tube walls into water which surrounds the tubes, said process being characterized by the saturated steam pressure being maintained in the range of about 150 to about 275 psig thereby maintaining the temperature of the water in contact with the tube walls in the range of about 186° C. to about 210° C.
References Cited (Backward Citations)
US1751533A
Cited
US2264226A
Cited
US2892451A
Cited
US2888910A
Cited
US3140155A
Cited
US3232280A
Cited
US3259108A
Cited
US3716339A
Cited
US3649187A
Cited
US3984206A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-01 | 1983-10-01 | 1984-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-01 | 1987-10-01 | 1988-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-01 | 1991-10-01 | 1992-04-01 | $7700.00 | Window Closed / Lapsed |