Supercritical-water-oxidation energy recovery system

Abstract

The invention discloses a supercritical-water-oxidation energy recovery system. The supercritical-water-oxidation energy recovery system disclosed by the invention has the beneficial effects that theoutlet end of a supercritical water oxidation reactor is connected with a high-pressure hydrocyclone, inorganic salts in reaction products in the supercritical water oxidation reactor are discharged from a sewage discharging port, high-pressure and high-pressure gas generated is exhausted into a buffering tank to carry out flat-pressing treatment, then the flatly-pressed gas passes through a high-pressure turboexpander and a low-pressure turboexpander in sequence to carry out residual-heat utilization for generating power, an outlet of the low-pressure turboexpander is connected with an evaporator, a Rankine circulation system is connected on the evaporator and is utilized for further utilizing residual heat of fluid passing through the evaporator, so that the energy input of the Rankine circulation system is reduced; the supercritical water oxidation system and a residual-heat and residual-pressure recovery system are fully combined, and heat energy and pressure energy of supercritical water oxidation products are fully utilized, so that the energy recovery and utilization rate of the supercritical water oxidation system is increased; carbon dioxide in the products is separated and recovered by utilizing a gas-liquid separator and a rectifying tower, so that the emission of greenhouse gas is reduced.

Description

technical field [0001] The invention relates to the fields of supercritical water oxidation and recovery of waste heat and pressure. Specifically, the invention particularly relates to a supercritical water oxidation energy recovery system. Background technique [0002] Supercritical Water Oxidation (SCWO) is a process that exceeds the critical point of water (P c =22.1MPa, T c =374.15°C) under high temperature and high pressure conditions, the method of "burning" and oxidizing organic matter through an oxidant. This technology uses the unique physical and chemical properties of supercritical water (such as low viscosity, high diffusion coefficient, small surface tension, etc.) to rapidly oxidize organic matter into CO 2 、H 2 O, N 2 And other non-toxic and harmless products, due to the high efficiency and cleanliness of this technology, it has received extensive attention from scholars at home and abroad. [0003] Supercritical water oxidation technology is usually used...

AI Technical Summary

Problems solved by technology

For the heat energy carried by the reaction product, it is generally used to preheat the raw material, but the temperature of the reaction product after preheating the raw material is still high, and this method leads to a low recovery rate of waste heat

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