| CPC C10G 9/16 (2013.01) [B01D 45/06 (2013.01); C10G 2300/107 (2013.01); C10G 2300/1074 (2013.01); C10G 2300/1081 (2013.01)] | 25 Claims |
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1. A hydrocarbon pyrolysis process, comprising:
introducing a hydrocarbon feed into a pyrolysis furnace comprising a first radiant coil and a second radiant coil;
pyrolysing at least a portion of a first quantity of the hydrocarbon feed in the first radiant coil to produce a first hydrocarbon effluent and to deposit coke on an inner surface of the first radiant coil;
pyrolysing at least a portion of a second quantity of the hydrocarbon feed in the second radiant coil to produce a second hydrocarbon effluent and to deposit coke on an inner surface of the second radiant coil;
decreasing a flow rate of the hydrocarbon feed into the first radiant coil while maintaining a flow rate of the hydrocarbon feed into the second radiant coil;
introducing a decoking feed comprising steam or a mixture of steam and air into the first radiant coil of the pyrolysis furnace to remove at least a portion of the coke deposited on the inner surface of the first radiant coil and to produce a de-coking effluent comprising steam and a plurality of coke particles;
indirectly exchanging heat from the second hydrocarbon effluent to water, steam, or a mixture thereof to produce a cooled second hydrocarbon effluent;
indirectly exchanging heat from the de-coking effluent to water, steam, or a mixture thereof to produce a cooled de-coking effluent;
mixing the cooled second hydrocarbon effluent and the cooled de-coking effluent to produce a combined effluent;
introducing the combined effluent into an inlet conduit of a separator under conditions that provide ≥80 wt. % of the plurality of coke particles with a Stokes number of ≥10;
removing ≥55 wt. % of the plurality of coke particles in the combined effluent from a first exit conduit of the separator, and
removing a coke-lean hydrocarbon effluent comprising ≤45 wt. % of the plurality of coke particles in the combined effluent from a second exit conduit of the separator, wherein the first exit conduit is coupled to the inlet conduit, and wherein the second exit conduit is coupled to the inlet conduit, wherein:
the plurality of coke particles is introduced into a coke catch apparatus,
a flow control device couples the first exit conduit to the coke catch apparatus, and
a total length of the first exit conduit and the flow control device is ≤8 times an inner diameter of the first exit conduit.
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