Reactor for treating supercritical water of waste organism

Abstract

The invention belongs to the field of treatment of waste organism, relates to supercritical water treatment of waste organism and discloses a reactor for treating supercritical water of waste organism; the reactor comprises a pressure-bearing chamber (2), an inner chamber (1) which is arranged in the pressure-bearing chamber (2) and composed of evaporation walls, a material feed pipe (4) and an overflow pipe (5) which run through the top part of the pressure-bearing chamber (2) and extend into the inner chamber (1), a salt outlet pipe which runs through the top part of the pressure-bearing chamber (2) and extend into the inner chamber (1); wherein, gaps are reserved between the inner chamber (1) and the pressure-bearing chamber (2), and the inner chamber (1) is provided with a water inlet pipe (7) for evaporating wall water.

Description

technical field [0001] The invention belongs to the field of organic matter treatment, and relates to supercritical water treatment of waste organic matter, in particular to a reactor for supercritical water treatment of waste organic matter. 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 (T=374.15°C, P=22.12MPa). Supercritical water has the properties of both liquid and gaseous water. In this state, only a small amount of hydrogen bonds exist. The dielectric constant is similar to that of polar organic solvents. It has a high diffusion coefficient and low viscosity. At sufficiently high pressure, SCW is miscible with air, oxygen, and organics in any proportion to form a homogeneous phase. At this time, the gas-liquid phase interface disappears, which eliminates the mass transfer resistance between the phases, and the reaction speed of the dissolved s...

AI Technical Summary

Problems solved by technology

Because the supercritical water treatment reactor of waste organic matter is under high temperature and high pressure conditions, especially the waste organic matter contains halogen, sulfur or phosphorus, which will produce acid after decomposing in supercritical water, causing strong corrosion of equipment; even with better corrosion resistance Ni-based materials with high corrosion resistance still suffer from severe corrosion in supercritical water, especially in subcritical water

[0008] (2) Salt deposition problem

Most salts have very low solubility in low-density supercritical water (typically 1-100mg / L)

When the subcritical solution is rapidly heated to the supercritical temperature, because the solubility of the salt is greatly reduced, a large amount of precipitation will be precipitated, and the deposited salt will cause the blockage of the reactor, which not only affects the normal operation of the reactor, but also brings potential danger

[0009] (3) Temperature control problem

For wastes with high organic content, excessive heat release in the SCWO process can easily lead to uncontrollable reactor temperature, resulting in deterioration of reaction conditions and reduction of reactor wall stress.

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