Supercritical water oxidation reaction system for obtaining heat supplemented by auxiliary fuel

Abstract

The invention discloses a supercritical water oxidation reaction system for obtaining the heat supplemented by auxiliary fuel. The supercritical water oxidation reaction system comprises a reactor, a material device, an oxidant device, a desalting device, a fuel supplementing device and a cooling water device, wherein the material device is communicated with a material inlet on a reactor end cover; the oxidant device is communicated with an oxidant inlet on the reactor end cover; and the desalting device is communicated with a solid salt outlet at the bottom of the reactor. The energy is supplemented to the system by the auxiliary fuel, thereby reducing higher equipment input and operation cost brought by arranging an electric heater; by adopting the single-pass heat return, on the premise of ensuring the effective heat of a recovering system, the complexity of the system is reduced and further the equipment input is reduced and the operating and running stability of the system is improved; and a reasonable desalting scheme is provided for simultaneously desorbing solid salts and soluble salts generated in the reaction process. The supercritical water oxidation reaction system canbe widely applied to the innocent treatment process of high-condensation pollutants, such as organic wastewater / landfill leachate, and the like which are difficult to biochemically degrade.

Description

technical field [0001] The invention belongs to the field of environmental protection and chemical industry, and in particular relates to a supercritical water treatment reaction system which uses supercritical water as a reaction medium to perform harmless treatment of waste organic liquids such as high-concentration organic waste water / garbage leachate that are difficult to biochemically degrade . Background technique [0002] Supercritical water (SCW) refers to water in a special state whose temperature and pressure are higher than its critical point (T=374.15°C, P=22.1MPa). SCW has the properties of both liquid and gaseous water, its dielectric constant is similar to that of non-polar organic solvents, and it has high diffusion coefficient and low viscosity. Under a sufficiently high pressure, organic matter and oxygen can be miscible with supercritical water according to the maximum proportion, so that the heterogeneous reaction becomes a homogeneous reaction, and the ...

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Problems solved by technology

[0007] 3) The salt contained in the feed and the salt generated during the reaction have extremely low solubility in supercritical water, and the existing domestic and foreign supercritical water treatment systems cannot completely desalinate the reaction fluid during the reaction process

Salt deposition will cause blockage and corrosion of equipment such as pipelines and reactors in the supercritical water treatment system, and also make the treated fluid high in salt content, making it difficult to recycle

Therefore, the salt content of wastewater must be strictly controlled, which seriously affects the wide range of supercritical water treatment objects.

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