What is supercritical water oxidation reactor
Supercritical water oxidation reactor decomposes the organic matter contained in the wastewater into simple non-toxic small molecular compounds, such as water and CO2.
The use of inconel625 material solves the problems of inorganic deposits and engineering clogging.
Supercritical water oxidation
Supercritical water oxidation (SCWO) technology is a new type of oxidation technology that can completely destroy the structure of organic matter.
Use supercritical water with special properties as a medium to decompose the organic matter contained in the wastewater with oxygen into water, carbon dioxide and other simple non-toxic small molecule compounds.
Picture on the right shows the supercritical water oxidation reactor for the treatment of China’s petroleum production wastewater
Critical point of water is 374.3℃ and pressure 22.064MPa. If the temperature and pressure of water are raised above the critical point, it is supercritical water.
Supercritical water can be completely miscible with non-polar substances (such as hydrocarbons) and other organic substances, while inorganic substances, especially salts, have very low ionization constants and solubility in supercritical water.
At the same time, supercritical water can be completely miscible with gases such as air, oxygen, nitrogen and carbon dioxide.
Picture shows a small supercritical water oxidation reactor
Since supercritical water is an excellent solvent for both organic matter and oxygen, the oxidation of organic matter can be carried out in an oxygen-rich homogeneous phase, and the reaction does not have limitations due to the need for phase shift.
At the same time, the high reaction temperature of 400-600°C also accelerates the reaction speed, and can reach a destruction rate of over 99% within a few seconds of reaction time.
The oxidation reaction of organic matter in supercritical water can be simply expressed as:
Supercritical water oxidation oxidation reaction
Supercritical water oxidation reaction is completely complete: organic carbon is converted to CO2, hydrogen is converted to H2O, halogen atoms are converted to halide ions, sulfur and phosphorus are converted to sulfate and phosphate, respectively, and nitrogen is converted to nitrate and nitrite ions or nitrogen. .
Moreover, the supercritical water oxidation reaction is similar to a simple combustion process to some extent, and a large amount of heat is released during the oxidation process.
Supercritical water oxidation process
Waste water and hydrogen peroxide are respectively passed through a high-pressure pump and heated in a preheater to reach a supercritical state.
It enters the mixer, enters the reaction tube to react, then is cooled by a cooler, reduced pressure, and finally enters a gas-liquid separator to separate the gas phase and the liquid phase.
Picture on the left shows a 100L supercritical water oxidizer in cooperation with Nanjing University of Technology
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