A corrosion-inhibiting supercritical water oxidation reactant mixing-preoxidation device

Abstract

The invention discloses a corrosion inhibition type supercritical water oxidation reactant mixing and pre-oxidizing device. The device is composed of a plurality of reactant mixing-pre-oxidizing device core tubes and outer tubes in a series connection mode along the way, and a core tube channel and an outer tube channel are formed. The core tube channel is sequentially provided with a plurality of reactant A injection ports along the way, the reactant A injection ports are used for injecting reactants A into the outer tube channel in a grading mode, and the outer tube channel is used for stage-by-stage mixing of the reactants A and reactants B and supercritical water oxidation reaction. The mixing and oxidizing process of organic waste and an oxidizing agent is effectively controlled, ultra-high-temperature damage caused by local concentrated heat release is avoided, and intensified corrosion of the high-concentration oxidization agent on equipment materials is relieved. The corrosion inhibition type supercritical water oxidation reactant mixing-pre-oxidizing device is arranged on an entrance of a supercritical water oxidation reactor, the service environment harshness of the supercritical water oxidation reactor is remarkably reduced, the service life of the reactor is prolonged easily, overall maintenance cost in the later stage of the supercritical water oxidation reactor is reduced, and the corrosion inhibition type supercritical water oxidation reactant mixing and pre-oxidizing device can be widely applied to performing supercritical water oxidation reactant on various heavy-pollution industrial wastewater and sludge.

Description

【Technical field】 [0001] The invention belongs to the technical field of supercritical water oxidation, and relates to reactant mixing-pre-reaction equipment, in particular to a corrosion-inhibiting type supercritical water oxidation reactant mixing-pre-oxidation device. 【Background technique】 [0002] Supercritical water (SCW), as a kind of supercritical fluid, refers to water whose temperature and pressure are above its critical point (374.15°C, 22.1MPa). Compared with ordinary liquid water and water vapor, various physical and chemical properties of supercritical water have changed greatly. The main physical parameters of SCW such as density, viscosity, ion product and dielectric constant are all significantly reduced, the diffusion coefficient is high, the mass transfer performance is good, and it can be completely miscible with gases (such as oxygen, nitrogen, etc.) and most organic substances. The phase interface disappears, eliminating the mass transfer resistance be...

AI Technical Summary

Problems solved by technology

The supercritical water oxidation reaction is an exothermic reaction. Once the organic waste is mixed with a high-concentration oxidant, the two will undergo a violent oxidation reaction. The concentrated heat release will cause the temperature at the reactor inlet to rise sharply, increasing the harshness of the service environment of the material at the inlet.

In addition, the input of high-concentration oxidant and the generation of high-concentration free radicals at the entrance of the reactor enhance the oxidation of the environment and intensify the oxidation and corrosion of the material at this part of the reactor.

Therefore, the inlet section of the traditional supercritical water oxidation reactor is the reactor section with the worst service environment, and its serious structural material corrosion failure greatly shortens the service life cycle of the entire reactor

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