Patent ID: 7658078

Claim:
A heavy oil reforming system, comprising: a gas-liquid mixer for mixing a high pressure heavy oil and high pressure steam; a reforming preheater raising the temperature of the mixed fluid having been mixed in the gas-liquid mixer UD to a temperature from 350 to 550° C. for reforming reaction; and a reformer kept at the temperature for reforming reaction, the reformer causing the mixed fluid having been heated by the reforming preheater to reside there, and thereby reforming the heavy oil, wherein the reforming preheater is configured to heat an exchanger tube through which the mixed fluid flows, from the outside by a heating medium; wherein the heat exchanger tube is arranged so that the entrance side thereof into which the mixed fluid flows is disposed at a position higher than the exit side thereof from which the mixed fluid flows out, and has a spiral structure; wherein the spiral is formed in the vertical direction; and wherein the heat exchanger tube having the spiral structure is covered with an outer tube to thereby take on a double tube structure, and is configured so that a heating medium flows between the heat exchanger tube and the outer tube.