Supercritical hydrothermal combustion device for high-salinity organic waste harmless treatment

Abstract

The invention provides a supercritical hydrothermal combustion device for high-salinity organic waste harmless treatment. An end cover is arranged at the upper end of a split pressure-bearing wall. Coaxial spraying nozzle base table is arranged in the center position of the bottom of the end cover. Multiple reactant annular space is constituted through ingenious cooperation between the end cover and the spraying nozzle base table. A high-temperature combustion chamber is formed inside the combustion device. Preheated oxygen and auxiliary fuels are combusted in the high-temperature combustion chamber, then organic waste is ignited inside the combustion device, rapid ignition combustion degradation of low-temperature organic waste is achieved, and moreover, heat consumption in the preheatingprocess is effectively reduced, and occurrence of corrosion and salt deposition in the process is prevented. A secondary oxygen injection port and auxiliary fuel injection port are formed in the combustion device so that the reaction process can be strengthened. By means of the supercritical hydrothermal combustion device for the high-salinity organic waste harmless treatment, online separation of water yielded from reaction and inorganic salt can be achieved; and besides, evaporation wall water is preheated through high temperature yielded water, systematic energy consumption is effectivelylowered, and it is prevented that the temperature of the evaporation wall water is too low so that effective degradation of pollutants inside the combustion device is influenced.

Description

technical field [0001] The invention belongs to the field of environmental protection and chemical technology, and relates to the harmless treatment process of high-concentration salt-containing organic pollutants that are difficult to biodegrade by using supercritical water as a reaction medium, in particular to a harmless treatment process for high-salt organic wastes. A chemically treated supercritical hydrothermal combustion device. Background technique [0002] Supercritical water refers to water in a special state whose temperature and pressure exceed its critical point (374.15°C, 22.1MPa). Its density is close to that of liquid, which is 100 to 1000 times larger than that of the corresponding atmospheric pressure gas; its viscosity is close to that of gas, which is about 1% to 10% of that of the corresponding liquid; its diffusion coefficient is between gas and liquid, which is 10 times that of ordinary liquid ~100 times. Supercritical water has a low dielectric con...

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Problems solved by technology

[0006] (2) Salt deposition problem

On the contrary, the solubility of most salts in low-density supercritical water is extremely small, resulting in a large amount of precipitation, causing blockage of the inlet and outlet pipelines of the combustion device, which not only affects the normal operation of the combustion device, but also brings potential equipment hidden dangers

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