Reaction chamber for supercritical water oxidation reactor

A method comprising, in a reaction chamber having an outer vessel and a first inner vessel located within a hollow cavity defined by walls of the outer vessel, the first inner vessel having one or more walls that define an interior of the first inner vessel, the interior containing liquid, the liquid having a temperature greater than 350° C. and a pressure greater than 3200 psi, and the one or more walls defining a longitudinal axis in the interior of the first inner vessel:

• injecting combustible fuel into the interior of the first inner vessel in a direction, such that the introduced fuel creates a cyclonic rotation of the liquid in the interior of the first inner vessel about the longitudinal axis;
• injecting water having a temperature less than 100° C. into a first water jacket space between the first inner vessel and the outer vessel;
• and
• removing water from the interior of the first inner vessel, wherein water injected into the first water jacket space and removed from the interior of the first inner vessel flows through the first water jacket space around the one or more walls of the first inner vessel before entering the first inner vessel though an open end of the first inner vessel.