Supercritical hydrothermal combustion device and method

Abstract

A supercritical hydrothermal combustion device comprises a device body serving as a combustion chamber. A hydrothermal flame generator is arranged on the side face of the upper portion of the device body. Multiple high-pressure organic slurry nozzles and multiple high-pressure oxidizing agent nozzles are arranged on the hydrothermal flame generator. Igniters are arranged at outlets of the nozzles.A supercritical thermal fluid guide pipe penetrates into the device body from the top face of the device body. A residue slurry outlet is formed in the bottom of the device body. A residue separationassembly is arranged at the bottom of the supercritical thermal fluid guide pipe. Solid-phase residues generated by combustion of the hydrothermal flame generator and part of liquid phase products flow out from the residue slurry outlet, the rest of liquid phase products enter the supercritical thermal fluid guide pipe after being filtered by the residue separation assembly and flow out from a supercritical thermal fluid outlet at the top of the supercritical thermal fluid guide pipe, and the rough separation process of solid-phase and liquid-phase products is achieved. By means of the supercritical hydrothermal combustion device, rapid ignition, stable and clean combustion and afterburnt residue and flow efficient separation of fossil fuel (such as coal), urban / industrial sludge and other solid-phase or solid bearing fuel are achieved.

Description

technical field [0001] The invention belongs to the technical field of advanced combustion, energy saving and environmental protection, and in particular relates to a supercritical hydrothermal combustion device and method. Background technique [0002] Supercritical water refers to water in a special state whose temperature and pressure are 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 efficient and harml...

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Problems solved by technology

[0003] At present, salt deposition and corrosion problems restrict the low-cost and reliable industrial implementation of supercritical water oxidation technology to a certain extent. Among them, the high-pressure 300-410°C high-temperature area is the material corrosion-sensitive area and the rapid precipitation area of ​​inorganic salts in the supercritical water oxidation process system. , the equipment serving in this working area is facing a relatively severe risk of corrosion and blockage caused by salt deposition

However, the hydrothermal combustion of solid fuels such as coal and sludge will still generate solid phase combustion slag. If not handled properly, it will block subsequent devices and affect the normal operation of the whole.

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