A method for improving operation reliability of a supercritical water oxidation system and the system

Abstract

The invention relates to the technical field of supercritical water oxidation, and particularly relates to a method for improving operation reliability of a supercritical water oxidation system and the system. The method includes a step of sludge pretreatment, namely a step of intercepting large floating matters in sludge, then feeding the sludge into a pretreatment loop, and subjecting the sludgeto precipitation, pH adjusting, refining, pressure adjusting, flow adjusting and temperature adjusting in order in the pretreatment loop until the pressure, temperature and flow of the sludge meet design requirements, and then feeding the sludge into a supercritical treatment unit; and a supercritical treatment step in which at least two supercritical treatment unit are arranged. A spare treatment unit is preserved and a treatment unit being operated can be automatically switched to the spare treatment unit when the treatment unit being operated requires maintenance or repairing, and a switching process does not affect continuous operation of the system. Operation reliability and stability of the supercritical water oxidation system are improved from the aspects of reactor structures, system configuration, operation manners and the like by the method.

Description

technical field [0001] The invention relates to the technical field of supercritical water oxidation, in particular to a method and system for improving the operation reliability of a supercritical water oxidation system. Background technique [0002] Supercritical water refers to water whose pressure and temperature exceed the critical point. The critical point of pure water is 374.3°C, 22.05MPa. Under these conditions, the properties of water have changed greatly, so that supercritical water has many new characteristics. For example, the polarity of water has changed greatly, making inorganic salts that are easily soluble in water under normal temperature and pressure conditions almost insoluble, and insoluble non-polar organic substances, oxygen, carbon dioxide and other gases can be mixed in any proportion. miscibility. The conventional heterogeneous reaction can be converted into a single-phase reaction, which greatly improves the mass transfer efficiency and reduces ...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of clogging, corrosion and salt accumulation in supercritical water oxidation treatment sludge, the present invention proposes a method for improving system operation stability and reliability from the aspects of reactor equipment structure, system configuration, operation mode, etc.

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