Method and apparatus for cooling a cracked gas stream
AssigneeExxon Research & Engineering Co.
InventorsRoger A. Gater, Herbert D. Michelson
Life of this patent
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Abstract
The invention relates to quenching a cracked hydrocarbon gas by passing a cracked gas stream axially through a pipe and injecting a liquid coolant into said pipe through a plurality of circumferentially arranged slots in a swirling manner, the weight ratio of the flow rate of the coolant to the flow rate of the gas stream being in the range of about 2 to about 15 whereby a sufficient amount of the coolant is swept into the gas stream to effectively cool the same. Suitable apparatus comprises a quench pipe formed of two substantially abutting sections, the downstream section being grooved to form with the upstream section of said slots. Preferably the upstream section has an internal circumferentially arranged deflector lip overhanging the slots.
Claims13
A method of quenching a cracked hydrocarbon gas which comprises passing a cracked gas stream axially through a pipe and injecting a liquid coolant into said pipe through a plurality of circumferentially arranged slots in a swirling manner, the weight ratio of the flow rate of the coolant to the flow rate of the gas stream being in the range of about 2 to about 15 whereby the centrifugal force of the thus injected coolant causes a portion thereof to contact the inner surface of the pipe, another portion thereof being entrained by the gas stream to effectively cool the same.
Apparatus for quenching a cracked gas stream from a hydrocarbon cracking furnace which comprises:
- a pipe for flow of the cracked gas stream axially therethrough;
- said pipe containing a plurality of circumferentially disposed slots which are slanted away from the center of the pipe to impart a swirling motion to liquid coolant injected into the pipe through the slots;
- the number of slots and size of the slots being large enough relative to the pipe diameter to allow a portion of liquid coolant to contact the inner surface of the pipe and another portion thereof to be entrained by the gas stream to effectively cool the same;
- and a plenum chamber external to the pipe and enclosing the slots, which is in open communication with the slots and with a source of liquid coolant, for injecting liquid coolant under pressure through the slots.
Apparatus for quenching a cracked hydrocarbon gas stream which comprises:
- a pipe for flow of the cracked gas stream axially therethrough;
- said pipe containing a plurality of circumferentially disposed tangential or substantially tangential slots, said slots being in alignment around the circumference and opening directly into the interior of the pipe through which the gas stream flows to impart centrifugal force to liquid coolant injected into the pipe through said slots;
- the number of slots and size of the slots being large enough relative to the pipe diameter to allow a portion of said liquid coolant to contact the inner surface of the pipe and another portion thereof to be entrained by the gas stream to effectively quench the same;
- and
- a plenum chamber external to the pipe and enclosing the slots, which is in open communication with the slots and with a source of liquid coolant, for injecting liquid coolant under pressure through the slots.
Dependencies are inferred from the claim text.