A quenching system for a plant, operating a cracking furnace, works with liquid as well as gaseous starting materials. The quenching system includes a primary heat exchanger (PQE 10) and a secondary heat exchanger (SQE 11) and a tertiary heat exchanger. A TLX-D exchanger (TLX-D 26) is arranged and configured as the tertiary heat exchanger for dual operation. The TLX-D (26) is connected in series via a TLX-D gas feed line (24) to the SQE 11. The TLX-D (26) is connected to a steam drum (59), which is connected to a feed water line (49), via a TLX-D feed water drain line (34) and a TLX-D riser (46) and a TLX-D downcomer (38). The SQE 11 is connected to the steam drum (59), which is connected to the feed water line (49), via a TLX downcomer (52) and a TLX-riser (57).

Methods and systems for improving energy conversion from the heat available in a hydrocarbon feedstream during the production of olefins. In a particular non-limiting embodiment, the method can include increasing the temperature of a hydrocarbon feedstream and a hydrogen gas feedstream via a first heat exchanger; combining the feedstreams and expanding the combined feedstream in an expander to decrease the pressure and/or temperature of the combined feedstream; increasing the temperature of the combined feedstream via a second heat exchanger; feeding the combined feedstream into a reactor to produce a reactor effluent; decreasing the temperature of the reactor effluent; and compressing the reactor effluent in a compressor, where the expansion of the combined feedstream drives the compressor.

Systems and methods of removing coke/tar from water in a quench water recycling loop of a steam cracker quench system are disclosed. The systems include a quench water separator that has a feed calming compartment for reducing eddies in feed to the quench water separator. The feed calming compartment is defined, at least in part, by a perforated baffle in the quench water separator. The methods include the use of the quench water separator with the perforated baffle and the calming compartment to separate coke/tar from quench water in the quench water recycling loop.

A method for quenching a pyrolysis product, including: supplying a discharge stream from a liquid decomposition furnace to a first quench tower; supplying an upper discharge stream from the first quench tower to a second quench tower; supplying a discharge stream from a first gas decomposition furnace to the second quench tower; and supplying a discharge stream from a second gas decomposition furnace to the second quench tower.

A quenching system for a plant, operating a cracking furnace, works with liquid as well as gaseous starting materials. The quenching system includes a primary heat exchanger (PQE 10) and a secondary heat exchanger (SQE 11) and a tertiary heat exchanger. A TLX-D exchanger (TLX-D 26) is arranged and configured as the tertiary heat exchanger for dual operation. The TLX-D (26) is connected in series via a TLX-D gas feed line (24) to the SQE 11. The TLX-D (26) is connected to a steam drum (59), which is connected to a feed water line (49), via a TLX-D feed water drain line (34) and a TLX-D riser (46) and a TLX-D downcomer (38). The SQE 11 is connected to the steam drum (59), which is connected to the feed water line (49), via a TLX downcomer (52) and a TLX-riser (57).

Embodiments disclosed herein relate to systems and processes for producing olefins and/or dienes. The systems and processes may include thermally cracking a C1-C4 hydrocarbon containing feed to produce a cracked hydrocarbon effluent containing a mixture of olefins and paraffins. The systems and processes may also include dehydrogenating the cracked hydrocarbon effluent to produce a dehydrogenated hydrocarbon effluent containing additional olefins and/or dienes.

Cracking furnace system for converting a hydrocarbon feedstock into cracked gas comprising a convection section, a radiant section and a cooling section, wherein the convection section includes a plurality of convection banks configured to receive and preheat hydrocarbon feedstock, wherein the radiant section includes a firebox comprising at least one radiant coil configured to heat up the feedstock to a temperature allowing a pyrolysis reaction, wherein the cooling section includes at least one transfer line exchanger.

The invention relates to hydrocarbon conversion, to equipment and materials useful for hydrocarbon conversion, and to processes for carrying out hydrocarbon conversion, e.g., hydrocarbon pyrolysis processes. The hydrocarbon conversion is carried out in a reactor which includes at least one channeled member that comprises refractory and has an open frontal area 55%. The refractory can include non-oxide ceramic.

Heat exchanger for quenching reaction gas comprising a coolable double-wall tube including an inner tubular wall and an outer tubular wall, wherein said inner tubular wall is configured to convey said reaction gas to be quenched, and wherein a space defined by said inner tubular wall and said outer tubular wall is configured to convey a coolant; a tubular connection member having a bifurcating longitudinal cross-section comprising an exterior wall section and an interior wall section defining an intermediate space filled with refractory filler material, wherein a converging end of said connection member is arranged to be in connection with an uncoolable reaction gas conveying pipe, wherein said exterior wall section is connected with said outer tubular wall of said coolable double-wall tube, wherein an axial gap is left between said interior wall section and said inner tubular wall of said coolable double-wall tube.

The invention relates to hydrocarbon conversion, to equipment and materials useful for hydrocarbon conversion, and to processes for carrying out hydrocarbon conversion, e.g., hydrocarbon pyrolysis processes. The hydrocarbon conversion is carried out in a reactor which includes at least one channeled member that comprises refractory and has an open frontal area 55%. The refractory can include non-oxide ceramic.