An indirect heat exchange supercritical water oxidation system and control method

Abstract

The invention discloses an indirect heat exchange type supercritical water oxidization system and a control method. The system mainly comprises a main supercritical water oxidization reaction flow and an intermediate medium loop. The control method comprises two-flow pressure and temperature increasing control, temperature and pressure reduction control and normal running control. The invention aims at an automatic control strategy for engineering practices of the indirect heat exchange type supercritical water oxidization system, and the concept of cyclic heating is adopted for a temperature increasing process of the system, so that investment in heating equipment is effectively reduced; mismatch between working pressure of two flows is avoided, and effectiveness of heat exchange between supercritical pressure fluids in an inner pipe and an outer pipe of a preheater / heat exchanger of a temperature increasing or temperature reduction stage of the system is ensured; process effects and system safety are ensured by effective control over reaction temperature and over-temperature protection over key equipment.

Description

【Technical field】 [0001] The invention belongs to the field of supercritical water treatment of organic waste, in particular to an indirect heat exchange type supercritical water oxidation system and a control method. 【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 (Tc=374.15°C, Pc=22.12MPa). Supercritical water oxidation technology uses the special properties of supercritical water, such as low viscosity, low dielectric constant, and high diffusivity, to make the organic matter completely dissolved in it react with the oxidant in a rapid and thorough homogeneous phase, and the carbon element in the organic matter is transformed into Carbon dioxide is converted into carbon dioxide, elements such as chlorine, sulfur, and phosphorus are converted into corresponding inorganic salts, and most nitrogen elements are converted into nitrogen gas to achieve ef...

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Problems solved by technology

[0007] The purpose of the present invention is to provide an indirect heat exchange supercritical water oxidation system and its control method in view of the high process parameters of the indirect heat exchange supercritical water oxidation system in the background technology and the high requirements for temperature and pressure matching between the two processes

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