METHOD FOR PREVENTING CORROSION OF HIGH TEMPERATURE HIGH PRESSURE WATER SYSTEM

摘要

PROBLEM TO BE SOLVED: To operate a system smoothly for a long time while preventing flow out of noxious metal by cooling a mixed fluid of organic and inorganic waters in high temperature high pressure condition of water while setting specified pressure and temperature thereby preventing corrosion and elution of noxious heavy metal due to temperature drop (cooling). SOLUTION: An inner tube is made of a material containing no noxious metal in a temperature region of 271-372 deg.C where significant corrosion and elution of various noxious metals take place when the temperature is dropped from the critical point (critical temperature 374 deg.C, critical pressure 21 MPa) of water in a candidate water system down to room temperature. The inner tube of this system is not subjected to pressure. Any material may be employed for the inner tube so long as a noxious substance, e.g. titanium alloy, ceramic or glass, is not contained. The prevention system is applicable to a supercritical water reaction system and a temperature drop line of various high temperature hot water associated with a high temperature hot water processing system.