Supercritical water oxidation reactor

Abstract

The invention relates to technical fields of environment protection and chemical engineering, in particular to a supercritical water oxidation reactor. The supercritical water oxidation reactor comprises an inner shell and an outer shell which are coaxially arranged; the inner shell is divided into an upper cylinder and a lower cone; the cylinder comprises an upper-section hole-free pipe and a lower-section straight porous pipe; the cone is of a tapered porous wall; the outer shell comprises an upper connection flange, a middle straight pressure bearing wall and a lower tapered bearing wall; a first ring gap is formed between the cylinder portion and the straight pressure bearing wall as well as the connection flange; a second ring gap is formed between the tapered porous wall and the tapered pressure bearing wall; an isolation ring is arranged between the first ring gap and the second ring gap; a high-temperature evaporated-water injection pipe is arranged on the upper portion of the straight pressure bearing wall; a low-temperature evaporated-water injection pipe is arranged on the upper portion of the tapered pressure bearing wall, and an outlet pipe is arranged at the bottom of the tapered pressure bearing wall; a nozzle pipe penetrating the top center of the inner shell is coaxially arranged on the connection flange. By the arrangement, evaporated water can be distributed evenly, and inhibition to center reaction during operation is avoided.

Description

Technical field [0001] The invention relates to the technical fields of environmental protection and chemical engineering, and in particular to a supercritical water oxidation reactor. Background technique [0002] High concentration (chemical oxygen demand COD> 2000mg / L), the treatment of toxic and refractory organic wastewater is a technical problem recognized 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 secondary pollution. Supercritical Water Oxidation (SCWO), as a new type of organic wastewater treatment technology, is one of the effective methods to solve this problem. [0003] Supercritical water oxidation occurs when the critical point (P C = 22.1MPa, TC = 374°C), using air or other oxidants to "burn" and oxidize organic matter. The polarity of water is a function...

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Problems solved by technology

[0005] However, due to the flow field characteristics in the water film reactor and the injection method of evaporated water, the uneven distribution of evaporated water causes local corrosion and salt deposition, and local overheating in the reactor (such as the nozzle, the upper part of the reactor, etc.)

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