Super critical water treatment system of waste organic liquid pollution less discharge and resources utilization

Abstract

A supercritical water treating system for reclaiming the rejected organic sewage and recovering its energy without draining of pollutants features that it has three preheaters (gas preheater, liquid preheater and material preheater) for respectively preheating the gas oxidant, liquid oxidant (or reaction medium) and material to suppress the generation of tar and coke and simplifying the design of reactor, and the oxidizing reaction and gasifying reaction are simultaneously preformed in this system.

Description

technical field [0001] The invention belongs to the field of organic matter treatment, and relates to a water treatment system for waste organic waste liquid, in particular to a supercritical water treatment system for harmlessly treating waste organic matter and producing hydrogen-rich gas by using supercritical water as a reaction medium. Background technique [0002] Water in a supercritical state is equivalent to a non-polar solvent and can be miscible with air, oxygen and organic matter in any proportion to form a homogeneous phase. The gas-liquid phase interface disappears, which eliminates the mass transfer resistance between the phases, and the reaction speed of the dissolved substances is no longer affected by the mass transfer. At the same time, high reaction temperature (about 400-650°C) also speeds up the reaction rate. [0003] Supercritical Water Oxidation (SCWO for short) is a highly advantageous technology for organic pollutants and sewage that has received ...

AI Technical Summary

Problems solved by technology

In the former case, if the preheating temperature reaches the supercritical temperature, the material will start to pyrolyze in the preheating tube, and the cracking reaction will produce tar and coke, block the pipeline, and have a great impact on the final product; If the preheating temperature is low, after entering the reactor, it needs to continue heating to reach the supercritical temperature, which will inevitably make the reactor structure more complicated

In the latter case, since the materials are not preheated and mixed before entering the reactor, the temperature of the entire fluid will drop a lot, so that the reactor needs to be designed with more heating parts

[0010] In addition, there is currently no system that can simultaneously perform the three functions of supercritical water oxidation, supercritical water gasification, and supercritical water partial oxidation.

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