Supercritical water oxidation industrial salt elimination method and system

Abstract

The invention discloses a supercritical water oxidation industrial salt elimination method, which adopts double lock hoppers or multiple lock hoppers to charge and release pressure so as to realize a safe, stable and long-period continuous salt elimination method, and at present, a salt solution back pressure valve method is adopted to eliminate salt, and the salt elimination is discontinuous salt elimination. Compared with the prior art, the problems of pressure fluctuation, repeated pressurization and pressure relief and the like of the reactor possibly caused by back pressure valve salt discharge are solved; meanwhile, the problems that due to the fact that the salt solution back pressure valve is seriously abraded and blocked due to pressure relief and frequent replacement of the back pressure valve, model selection and stable operation of the back pressure valve are difficult all the time, stable operation of the device is directly affected, and particularly frequent replacement is difficult to achieve when radioactive materials are treated are solved.

Description

technical field [0001] The invention relates to an industrialized salt discharge method by supercritical water oxidation, in particular to a safe, reliable and long-term operation of a salt discharge system through stable gas pressure reduction, and is mainly applied to supercritical water oxidation or other high-pressure gas-liquid or gas-liquid The invention relates to a salt discharge method of a solid multiphase flow system, belonging to the technical field of supercritical water oxidation treatment of sewage containing organic solid waste, organic hazardous waste and radioactive organic waste. Background technique [0002] Supercritical water oxidation technology has been widely used in nuclear power, military, chemical, petroleum, municipal, pharmaceutical, food and other industries to treat toxic, harmful and refractory organic wastes. The technical characteristics of supercritical water oxidation technology to treat organic waste are high oxidation efficiency (the ox...

AI Technical Summary

Problems solved by technology

[0003] The salt removal technology of the supercritical water oxidation process has always been one of the major problems that have plagued scholars. Through conventional cooling and pressure reduction, the pressure difference is too large when the fine particles of salt pass through the back pressure valve (about 25~ 28MPa(G)), the sealing surface of the back pressure valve is very severely worn. The use of the test prototype reflects that the imported back pressure valve can be used for more than a month, and the sealing surface is damaged. Will be destroyed, it is difficult to maintain the high pressure of the reaction system, so that it cannot be used continuously, and needs to be repaired or replaced next time

It not only causes high economic cost, but also makes it difficult to realize the continuous and stable operation of the salt discharge system, let alone industrialized promotion and use

Images