System for supercritical hydrothermal flame enhanced supercritical water oxidation treatment of organic waste and regulation and control method

Abstract

The invention discloses a supercritical hydrothermal flame coupled system for supercritical water oxidation treatment of organic matters and a control strategy for start ignition and stable operationworking conditions. The system realizes faster, safe and stable degradation of organic pollutants. Meanwhile, the high heat of a supercritical hydrothermal flame area is utilized for rapid heating, salt precipitation and on-line removal of a relatively low-temperature (below 300DEG C) to-be-treated waste liquid in a combustion / heating-desalting integrated device. According to the invention, the problems of corrosion and salt deposition in a maximum risk temperature zone are overcome, also the high-temperature preheating requirement of the to-be-treated material is also reduced, the energy utilization of the whole system is saved, and the cost reduction and benefit increase of the traditional supercritical water oxidation device are realized.

Description

technical field [0001] The invention belongs to the field of harmless treatment of organic pollutants and energy utilization, and specifically relates to a supercritical hydrothermal flame-enhanced supercritical water oxidation system and a control method for organic waste treatment. Background technique [0002] Supercritical Water (SCW for short) refers to water in a special state whose temperature and pressure are both higher than its critical point (Tc=374.15°C, Pc=22.12MPa). Supercritical water oxidation technology uses the special properties of supercritical water, such as low viscosity, low dielectric constant, and high diffusivity, to make the organic matter completely dissolved in it react with the oxidant in a rapid and thorough homogeneous phase, and the carbon element in the organic matter is transformed into Carbon dioxide is converted into carbon dioxide, elements such as chlorine, sulfur, and phosphorus are converted into corresponding inorganic salts, and mos...

AI Technical Summary

Problems solved by technology

[0003] At present, problems such as salt deposition and corrosion restrict the low-cost and reliable industrial implementation of supercritical water oxidation technology to a certain extent

During the preheating process, as the material gradually increases from the subcritical temperature to the supercritical temperature, the dielectric constant of water and the hydrogen bond decrease, and the inorganic salt in the material will be deposited on the inner surface of the preheating equipment or the pipeline; in addition, the supercritical The inorganic salts generated during the water oxidation reaction may also precipitate and form salt scale, which will cause blockage of pipelines and equipment and affect the normal operation of the system

Near the critical point of the transition from subcritical water to supercritical water is a high-density water area (usually considered to be 300°C-420°C), where the dielectric constant of water and the solubility of inorganic salts are large, and it is a corrosion-sensitive area, which is easy to cause corrosion. Corrosion damage of pipelines and equipment serving in this temperature region

Images