Method for improving oxygen utilization rate of supercritical water oxidation system

Abstract

The invention relates to a method for improving oxygen utilization rate of a supercritical water oxidation system. The method comprises the following steps of: injecting excessive oxygen and preheated organic waste liquid from the upper part of an evaporation wall reactor, mixing the oxygen and the organic waste liquid, performing supercritical water oxidation reaction on the mixture, and injecting evaporation water from the lateral surface of the evaporation wall reactor so as to form a supercritical temperature reaction area on the upper part and a sub-critical temperature salt dissolution area on the lower part in the reactor. When the reacted rest oxygen downwards flows to the sub-critical temperature salt dissolution area from the supercritical temperature reaction area, a part of oxygen is separated out and circulated to the supercritical temperature area on the upper part of the reactor to form internal circulation utilization of the oxygen; and the reacted fluid enters a high-pressure gas-liquid separator through condensation and pressure reduction, is dissolved into sub-critical water and carries the oxygen flowing out of the reactor, is separated by the high-pressure gas-liquid separator and then is re-injected to the reactor to form external circulation utilization. The method remarkably reduces the excessive oxygen amount coefficient by improving the utilization rate of the oxygen, and improves the running economy of the supercritical water oxidation system.

Description

1. Technical field [0001] The invention belongs to the field of organic waste treatment, in particular to a method for improving the oxygen utilization rate of a supercritical water oxidation system. 2. Background technology [0002] Supercritical Water Oxidation (Supercritical Water Oxidation) technology is a new type of treatment of organic waste and recovery of energy and pure CO 2 Technology. This technology is a method of "burning" and oxidizing organic matter with oxygen or other oxidants under high temperature and high pressure conditions exceeding the critical point of water (T=374°C, P=22.1MPa). Supercritical water has a liquid-like density, solubility and good fluidity. It is a non-polar solvent, and it also has a gas-like diffusion coefficient and low viscosity. In supercritical water, the gas-liquid two-phase interface disappears, organic matter and O 2 It is completely soluble in supercritical water to form a homogeneous phase system, and the reaction speed i...

AI Technical Summary

Problems solved by technology

[0006] A method for improving the utilization rate of oxygen in a supercritical water oxidation system. The invention aims at the problem of high cost and low utilization rate of oxygen in the operation of a supercritical water oxidation system, and proposes to achieve double cycle utilization of oxygen inside and outside the evaporation wall reactor. Improve the oxygen utilization rate of the supercritical water oxidation system, thereby improving the economy of system operation

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