Provided is a steam reforming system including: a heat exchange type-water gas shift reactor into which raw water is introduced to generate a first stream; a steam generator into which the first stream is introduced from the heat exchange type-water gas shift reactor to generate a second stream; a mixer into which a second stream is introduced from the steam generator and the raw gas is separately introduced to generate a mixed raw material; a superheater into which the mixed raw material is introduced from the mixer to generate a third stream; and a steam reforming reactor into which the third stream is introduced from the superheater to generate reformed gas, and further including an electric heater-type evaporator in front of the steam reforming reactor.

A method of decomposing a pre-heated feedstock includes flowing a stream of the pre-heated feedstock and injecting an oxidant into the flowing stream of pre-heated feedstock. The oxidant mixes with the pre-heated feedstock and, in response to the mixing, at least a first portion of the pre-heated feedstock auto-ignites and causes at least a second portion of the pre-heated feedstock to decompose into one or more products by pyrolysis.

Provided is a method for preparing synthesis gas, and more particularly, a method for preparing synthesis gas including: mixing a pyrolysis fuel oil (PFO) stream including a PFO and a pyrolysis gas oil (PGO) stream including a PGO discharged from a naphtha cracking center (NCC) process to produce a mixed oil stream (S10); and supplying the mixed oil stream to a combustion chamber for a gasification process to obtain synthesis gas (S20), wherein a ratio of a flow rate of the PGO stream in the mixed oil stream to a flow rate of the mixed oil stream is 0.01 to 0.3.

A process and reactor system are provided for production of a CO-containing stream. The process includes the steps of supplying a carbon-containing first feed and an optional co-feed to the electrically-heated reactor and allowing them to undergo a CO-forming reaction, while heating the electrically-heated reactor by means of electrical power; and outletting a CO-containing stream from electrically-heated reactor, wherein the content of sulfur-containing species in the total gas mixture supplied to the electrically-heated reactormeasured in terms of H.sub.2Sis in the range of 1-50 ppm.