Patent ID: 6958122

Claim:
A method for injecting a first fluid of a first temperature at a first flow rate into a second fluid of a second temperature at a second flow rate in a high pressure and high temperature reaction system suitable for oxidative waste treatment, comprising: transporting the first fluid in a first conduit adapted to transport the first fluid; transporting the second fluid in a second conduit adapted to transport the second fluid, wherein the first conduit comprises an end within the interior of the second conduit, and wherein the first conduit is in fluid communication with the second conduit; mixing the first and the second fluids in the second conduit within a mixing length downstream of the end of the first conduit, wherein the second conduit comprises a tube or liner having at least an inner surface area made of a corrosion resistant material and extending along the mixing length to inhibit corrosion of the second conduit; wherein the first fluid is corrosive in a corrosive temperature range; wherein the corrosive temperature range excludes the second temperature and includes the first temperature; wherein the second temperature is selected to be lower than the corrosive temperature range; wherein the first and second temperatures and the first and second flow rates are selected such that the temperature of the mixed fluids downstream of the mixing length is lower than the corrosive temperature range; and wherein the first and second temperatures and the first and second flow rates are selected such that the mixed fluids downstream of the mixing length are at a temperature that is substantially non-corrosive for the first fluid.