Evaporation wall-type supercritical water oxidation reactor capable of directly separating salt and subcritical water

Abstract

The invention relates to an evaporation wall-type supercritical water oxidation reactor capable of directly separating salt and subcritical water. The cylinder is fixed with an upper end cover and a lower end cover; the middle part of the upper end cover is provided with a burner component which extends to the inside of the cylinder; the upper end cover is provided with a gas-phase outlet and a sewage secondary inlet; the upper part in the cylinder is fixedly provided with a shell-and-tube heat exchanger; the upper part of the cylinder is provided with a sewage primary inlet and a normal temperature sewage outlet; the cylinder is provided with a subcritical water outlet; the lower part in the cylinder is fixedly provided with a multilayer evaporation wall; a plurality of annular spaces are formed between the multilayer evaporation wall and the cylinder from top to bottom; the cylinder is sequentially provided with a plurality of evaporation wall water inlets; the upper edge of the multilayer evaporation wall is provided with an evaporation wall spherical baffle; the lower end of the burner component is fixedly provided with a burner spherical baffle; and the bottom of the lower end cover is provided with a brine outlet. The oxidation reactor effectively prevents the preheater, reactor and pipelines from blockage and corrosion, reduces the quantity of pure water used by the evaporation wall, and can reduce the reactor volume and lower the noble alloy consumption.

Description

technical field [0001] The invention relates to a supercritical water oxidation reactor in the field of environmental protection technology, in particular to an evaporation wall type supercritical water oxidation reactor capable of directly separating salt and subcritical water. Background technique [0002] At present, the main methods used in the industrial treatment of water samples containing organic compounds are oxidation, adsorption filtration, and incineration. Among them, there will still be residual organic matter in the water samples treated by the oxidation method and adsorption filtration method, while the treatment cost of the incineration method is relatively high, and substances such as dioxins will be produced, which require subsequent treatment. [0003] Supercritical water oxidation (SCWO) technology was first proposed by American scholar Modell in the mid-1980s as a deep oxidation technology that can completely and thoroughly destroy the structure of orga...

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Problems solved by technology

[0005] However, due to the harsh conditions of the supercritical water oxidation reaction at 374.15°C and 22.12Mpa, many processes are difficult to maintain stable operation. In many processes, the waste water and oxidant fluid are preheated to supercritical conditions and enter the reactor, so that during the preheating stage The problem of pipeline blockage caused by salt precipitation and pyrolysis, cracking and other reactions caused by decarburization and coking, the problem of material selection at high temperature and high pressure in the reactor, the strong corrosion problem of salt in subcritical water at high temperature in the reactor, and the reaction Difficulties such as the difficulty of separating post-salt and subcritical water have greatly restricted the development of this technology

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