Control of a reforming furnace
IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0480201
(1983-03-30)
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발명자
/ 주소 |
- Stewart William S. (Bartlesville OK)
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출원인 / 주소 |
- Phillips Petroleum Company (Bartlesville OK 02)
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인용정보 |
피인용 횟수 :
8 인용 특허 :
5 |
초록
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A reforming furnace having a radiant section containing cracking tubes, a convection section and a stack is controlled so as to maintain a desired synthesis gas temperature unless such maintenance would result in the violation of a process constraint. The desired excess oxygen concentration in the c
A reforming furnace having a radiant section containing cracking tubes, a convection section and a stack is controlled so as to maintain a desired synthesis gas temperature unless such maintenance would result in the violation of a process constraint. The desired excess oxygen concentration in the combustion gases withdrawn from the radiant section is also maintained while maintaining the desired synthesis gas temperature. As for the convection section, the temperature of a fluid stream passing through the convection section is maintained while still maintaining a desired excess oxygen concentration in the stack gas.
대표청구항
▼
Apparatus comprising: a reforming furnace having a radiant section, a convection section and a stack, wherein said radiant section contains cracking tubes; means for supplying a hydrocarbon-containing feed gas to the cracking tubes contained in the radiant section of said reforming furnace; means fo
Apparatus comprising: a reforming furnace having a radiant section, a convection section and a stack, wherein said radiant section contains cracking tubes; means for supplying a hydrocarbon-containing feed gas to the cracking tubes contained in the radiant section of said reforming furnace; means for withdrawing a synthesis gas formed by passing said hydrocarbon-containing feed gas through said cracking tubes from said reforming furnace; means for passing a fluid stream through said convection section, wherein said fluid stream is heated by passing through said convection section; means for supplying a primary fuel stream to said radiant section; means for supplying a primary air stream to said radiant section, wherein the combustion of said primary fuel stream mixed with said primary air stream provides heat to the cracking tubes in said radiant section and wherein the combustion gases from the combustion of said primary fuel stream mixed with said primary air stream pass through said convection section to said stack; means for supplying an auxiliary fuel stream to said convection section; means for supplying an auxiliary air stream to said convection section, wherein the combustion of said auxiliary fuel stream mixed with said auxiliary air stream provides heat to said convection section and wherein the combustion gases from the combustion of said auxiliary fuel stream mixed with said auxiliary air stream pass through said stack; means for establishing a first signal representative of the actual temperature of said synthesis gas; means for establishing a second signal representative of the desired temperature of said synthesis gas; means for comparing said first signal and said second signal and for establishing a third signal which is responsive to the difference between said first signal and said second signal, wherein said third signal is scaled so as to be representative of the primary fuel flow rate to hydrocarbon-containing feed stream flow rate ratio required to maintain the actual synthesis gas temperature substantially equal to the desired temperature represented by said second signal; means for establishing a fourth signal representative of the actual temperature of said cracking tubes; means for establishing a fifth signal representative of the maximum desired temperature of said cracking tubes; means for comparing said fourth signal and said fifth signal and for establishing a sixth signal which is responsive to the difference between said fourth signal and said fifth signal, wherein said sixth signal is scaled so as to be representative of the primary fuel flow rate by hydrocarbon-containing feed stream flow rate ratio required to maintain the actual tube temperature substantially equal to the maximum desired temperature represented by said fifth signal; a first low select means; means for providing said third signal and said sixth signal to said first low select means, wherein said first low select means establishes a seventh signal which is equal to the one of said third and sixth signals which is representative of the lowest primary fuel flow rate to hydrocarbon-containing feed stream flow rate ratio; means for establishing an eighth signal, which is representative of the desired flow rate of said primary fuel stream, in response to said seventh signal; means for manipulating the flow rate of said primary fuel stream in response to said eighth signal; means for establishing a ninth signal, which is representative of the desired flow rate of said primary air stream, in response to said seventh signal; means for manipulating the flow rate of said primary air stream in response to said ninth signal; means for establishing a tenth signal representative of the actual temperature of said fluid stream flowing from said convection section; means for establishing an eleventh signal representative of the desired temperature of said process stream; means for comparing said tenth signal and said eleventh signal and for establishing a twelfth signal which is responsive to the difference between said tenth signal and said eleventh signal, wherein said twelfth signal is scaled so as to be representative of the total fuel flow rate (said primary fuel stream plus said auxiliary fuel stream) to said hydrocarbon-containing feed stream flow rate ratio required to maintain the actual temperature of said fluid stream substantially equal to the desired temperature represented by said twelfth signal; means for establishing a thirteenth signal, which is representative of the desired flow rate of said auxiliary fuel, in response to said twelfth signal; means for manipulating the flow rate of said auxiliary fuel in response to said thirteenth signal; means for establishing a fourteenth signal representative of the desired flow rate of said auxiliary air in response to said twelfth signal; and means for manipulating the flow rate of said auxiliary air in response to said fourteenth signal. A method for controlling a reforming furnace having a radiant section containing cracking tubes, a convection section and a stack, wherein a hydrocarbon-containing feed gas is passed through said cracking tubes to form a synthesis gas, wherein a fluid stream is passed through said convection section to heat said fluid stream; wherein a primary fuel stream and a primary air stream are combusted in said radiant section to supply heat to said cracking tubes, wherein the combustion gases from the combustion of said primary fuel stream and said primary air stream pass though said convection section to said stack; wherein an auxiliary fuel stream and auxiliary air stream are combusted in said convection section to supply heat to said convection section and wherein the combustion gases from the combustion of said auxiliary fuel stream and said auxiliary air stream pass through said stack, said method comprising the steps of: establishing a first signal representative of the actual temperature of said synthesis gas; establishing a second signal representative of the desired temperature of said synthesis gas; comparing said first signal and said second signal and establishing a third signal which is responsive to the difference between said first signal and said second signal, wherein said third signal is scaled so as to be representative of the primary fuel flow rate to hydrocarbon-containing feed stream flow rate ratio required to maintain the actual synthesis gas temperature substantially equal to the desired temperature represented by said second signal; establishing a fourth signal representative of the actual temperature of said cracking tubes; establishing a fifth signal representative of the maximum desired temperature of said cracking tubes; comparing said fourth signal and said fifth signal and establishing a sixth signal which is responsive to the difference between said fourth signal and said fifth signal, wherein said sixth signal is scaled so as to be representative of the primary fuel flow rate to hydrocarbon-containing feed stream flow rate ratio required to maintain the actual tube temperature substantially equal to the maximum desired temperature represented by said fifth signal; establishing a seventh signal which is equal to the one of said third and sixth signals which is representative of the lowest primary fuel flow rate to hydrocarbon-containing feed stream flow rate ratio; establishing an eighth signal, which is representative of the desired flow rate of said primary fuel stream, in response to said seventh signal; manipulating the flow rate of said primary fuel stream in response to said eighth signal; establishing a ninth signal, which is representative of the desired flow rate of said primary air stream, in response to said seventh signal; manipulating the flow rate of said primary air stream in response to said ninth signal; establishing a tenth signal representative of the actual temperature of said fluid stream flowing from said convection section; establishing an eleventh signal representative of the desired temperature of said process stream; comparing said tenth signal and said eleventh signal and establishing a twelfth signal which is responsive to the difference between said tenth signal and said eleventh signal, wherein said twelfth signal is scaled so as to be representative of the total fuel flow rate (said primary fuel stream plus said auxiliary fuel stream) to said hydrocarbon-containing feed stream flow rate ratio required to maintain the actual temperature of said fluid stream substantially equal to the desired temperature represented by said twelfth signal; establishing a thirteenth signal, which is representative of the desired flow rate of said auxiliary fuel, in response to said twelfth signal; manipulating the flow rare of said auxiliary fuel in response to said thirteenth signal; establishing a fourteenth signal representative of the desired flow rate of said auxiliary air in response to said twelfth signal; and manipulating the flow rate of said auxiliary air in response to said fourteenth signal.
이 특허에 인용된 특허 (5)
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Scott Norman H. (Arlington Heights IL), Heat exchange and flow control system for series flow reactors.
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Kennedy James P. (700 Cary Dr. San Leandro CA 94577), Multivariable control system for regulating process conditions and process optimizing.
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Ball Donald H. (Bartlesville OK) Voelkers James D. (Bartlesville OK), Process control method and apparatus.
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Stewart ; William S., Process control method and apparatus.
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Pinto ; Alwyn, Steam-hydrocarbon process.
이 특허를 인용한 특허 (8)
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Li, Tong; Wang, Justin Jian, Advanced control system for steam hydrocarbon reforming furnaces.
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Palamara, John Eugene; Zagnoli, David Anthony; Baade, William Frederick, Integrated hydrogen production and hydrocarbon extraction.
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Mulligan, D. Neal, Internal combustion engine with SCR and integrated ammonia production.
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Gallarda, Jean, Method of replacing the catalyst tubes of a hydrocarbon reformer.
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Ponzi, Peter R.; Bertola, Francesco; Gartside, Robert J., Method, system and apparatus for firing control.
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R. Kirk Collier, Jr., Natural gas powered engine.
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R. Kirk Collier, Jr., Octane enhanced natural gas for internal combustion engine.
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Collier, Jr., R. Kirk, Reformed natural gas for powering an internal combustion engine.
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