Supercritical water oxidation treatment system for high-salt high-chlorine organic wastewater

Abstract

The invention discloses a supercritical water oxidation treatment system for high-salt high-chlorine organic wastewater. Heat of reacted fluid is partially recovered by a second heat exchanger to preheat feedstock, and the heat of fluid passing through a reactor is recovered by steam generated by a steam generator, so that the system investment and operating cost are effectively reduced; a hydraulic cyclone, a first salt storage tank, a second salt storage tank, first and second pipeline filters and a high pressure filling pump are arranged, the pressure reduction requirement of the treatmentsystem can be met, the blockage frequency of the first and second pipeline filters is reduced, and insoluble salt can be continuously removed and discharged; meanwhile, the flow rate of the fluid in the system is controlled to be 1-2m / s, the deposition and blockage of the insoluble salt and soluble salt separated out under the supercritical water condition are further effectively reduced. In addition, equipment and conveying pipelines, which are contacted with the high-salt high-chlorine organic wastewater in the system, are made of composite tubes, the corrosion of the system can be effectively reduced and the equipment investment cost is reduced.

Description

technical field [0001] The invention relates to a system for harmlessly treating high-salt and high-chlorine organic wastewater by using supercritical water as a reaction medium. 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). Water has special properties in the supercritical state. It only contains a small amount of hydrogen bonds. Its dielectric constant is similar to that of organic solvents. It has high diffusion coefficient and low viscosity. It is a good reaction medium. SCW can completely dissolve with organic matter, oxygen, nitrogen, etc., and undergo a homogeneous reaction, which eliminates the mass transfer resistance between the phase interfaces, accelerates the mass transfer rate, and greatly shortens the reaction time. In addition, the solubility of inorganic salts in SCW is extremely low and can be easily sepa...

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Problems solved by technology

[0009] The purpose of the present invention is to solve the equipment and pipeline corrosion and blockage problems involved in the high-salt and high-chlorine organic wastewater SCWO system in the background technology, and provide a supercritical water oxidation system suitable for treating high-salt and high-chlorine organic wastewater , effectively reduce system investment and operating costs

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