Method for recovery and cascade utilization of waste heat of supercritical water treatment system of waste organic substances

Abstract

The invention belongs to the field of supercritical water treatment, and discloses a method for recovery and cascade utilization of waste heat of a supercritical water treatment system of waste organic substances. The method comprises the following steps that: for fluid overflowing out of the reaction outlet end of a reactor, one part of the fluid flows through a heating coil pipe in a desalting and deslagging device first, and then flows through a heat exchanger group to preheat materials after strong brine in the desalting and deslagging device is heated; another part of the fluid is used for preheating a first path of evaporation wall water; then two parts of the fluids are mixed together, and after vapor-liquid separation, the liquid flows through a hot bath type liquid oxygen vaporizer to vaporize liquid oxygen, and finally flows back into a first liquid collection box; and the fluid overflowing out of the upper outlet end of the desalting and deslagging device flows through a first heat exchanger to preheat oxygen first and then preheat a second path of the evaporation wall water, and after the vapor-liquid separation, the liquid flows back into a second liquid collection box. Thus, the sufficient recovery and the cascade utilization of the waste heat are achieved.

Description

technical field

[0001] The invention belongs to the field of supercritical water treatment, in particular to a waste heat recovery and cascade utilization method of a supercritical water treatment system for waste organic matter. 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 high attention in recent years. It is unique in dealing with organic pollutants. This technology uses the speci...

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