Supercritical water oxidation system using air as protecting film and reaction process

Abstract

The invention provides a supercritical water oxidation system using air as a protecting film and a reaction process. The system comprises a double-housing reactor, an organic wastewater inputting pipeline, an air inputting pipeline and a reactant discharging pipeline, wherein the double-housing reactor comprises a porous wall arranged at the outer part, and a bearing wall arranged at the inner part; a separating ring is arranged between the porous wall and the bearing wall; a waste liquid inlet is formed in the top part of the double-housing reactor, and while a reactor outlet is formed in the bottom part of the double-housing reactor; an upper air inlet and a lower air inlet are formed in the bearing wall; the organic wastewater inputting pipe is connected with the waste liquid inlet; two branches of the air inputting pipeline are respectively connected with the upper air inlet and the lower air inlet; the reactant discharging pipeline is connected with the reactor outlet. The system achieves upercritical water oxidation reaction and porous wall protection, and can avoid concentrated release of reaction heat in the upper part of the double-housing reactor because that the concentrated release of the reaction heat leads to overheat of the upper part of the double-housing reactor and excessively large axial temperature gradient and damage to the porous wall; meanwhile, the corrosion and salt deposition of the double-housing reactor can be avoided.

Description

technical field [0001] The invention relates to the field of environmental protection and purification, and more specifically relates to a supercritical water oxidation system and a reaction process using air as a protective film. Background technique [0002] The treatment of high-concentration, toxic and refractory organic wastewater is a recognized problem at home and abroad. Traditional organic wastewater treatment technologies (such as physical and chemical treatment technology, biological treatment technology, wet oxidation, incineration, etc.) have problems such as high cost, low degradation rate, and easy secondary pollution. [0003] Supercritical water refers to water when the density of water expanded due to high temperature is exactly the same as the density of water vapor compressed due to high pressure when the pressure and temperature reach a certain value. At this time, there is no difference between the liquid and gas of water, and they are completely blend...

AI Technical Summary

Problems solved by technology

The water film reactor needs to inject a large amount of deionized water from the wall as evaporated water to protect the porous wall and cool the reaction fluid out of the reactor, which undoubtedly increases the operating cost of the system

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