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Supercritical water gasification-oxidation method for treating organic wastewater and recycling synthesis gas

A technology of supercritical water gasification and supercritical water oxidation, which is applied in the fields of oxidized water/sewage treatment, chemical instruments and methods, inorganic chemistry, etc.

Active Publication Date: 2013-01-16
XI AN JIAOTONG UNIV +1
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  • Application Information

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Problems solved by technology

However, the concentration of chemical oxygen demand (COD) in high-concentration organic wastewater is as high as 10,000mg / L. Traditional organic wastewater treatment usually only considers the harmless treatment of organic pollutants, and does not consider the resource utilization of organic wastewater.

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  • Supercritical water gasification-oxidation method for treating organic wastewater and recycling synthesis gas

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the drawings and a specific embodiment:

[0022] Reference figure 1 , The treatment capacity is 100t / d of pesticide wastewater, COD (chemical oxygen demand) is 70,000mg / L, and the organic wastewater is transported to the preheater 3 by the high-pressure pump 1 to preheat the wastewater to 550°C and enter the supercritical water gasification Reactor 4; Oxygen is compressed to 25MPa by compressor 2, 0.4 times the amount required for complete oxidation of split organics to supercritical water oxidation reactor 4, reaction temperature is 550℃, pressure is 25MPa; after the reaction fluid is exchanged by heat exchanger 5 When heated to 45°C, it enters the high-pressure gas-liquid separator 6; the cold fluid medium of the heat exchanger 5 is softened water, which generates 170°C steam for reuse after heat exchange; the upper part of the high-pressure gas-liquid separator 6 produces H 2 , CO, CH 4 ...

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Abstract

The invention discloses a supercritical water gasification-oxidation method for treating organic wastewater and recycling synthesis gas. The supercritical water gasification-oxidation method comprises the following steps that: (1) the organic wastewater enters a preheater and a supercritical water gasification device sequentially by a high-pressure pump, and oxygen is divided by a compressor, so that one part of oxygen enters the supercritical water gasification device; (2) fluid from an outlet of the supercritical water gasification device enters a high-pressure gas-liquid separator by a heat exchanger, the synthesis gas of H2, CO and CH4 on the upper part is recycled, the fluid at the bottom enters a heater and a supercritical water oxidation reactor sequentially, and the part of oxygen which is divided by the compressor enters the supercritical water oxidation reactor; and (3) the fluid passing through the supercritical water oxidation reactor passes through a cooler and a back pressure valve sequentially and is discharged under the condition of reaching the standard. The supercritical water gasification-oxidation method can be widely applied to the treatment of the high-concentration organic wastewater.

Description

Technical field [0001] The invention belongs to the field of resource utilization and harmless treatment of organic wastewater, and particularly relates to a method for treating high-concentration organic wastewater and recovering synthesis gas by a supercritical water gasification-oxidation combined process. Background technique [0002] Water under supercritical conditions (T> 374.15℃, P> 22.12MPa) has the properties of both gas and liquid. In this state, only a small amount of hydrogen bonds exist. It has liquid-like density, solubility and good fluidity. It is a non-polar organic solvent and has high gas-like properties. Diffusion coefficient and low viscosity. [0003] Supercritical water gasification technology uses the unique physical and chemical properties of supercritical water. Without adding oxidants or adding a small amount of oxygen, the organic matter will undergo oxidation, hydrolysis, pyrolysis and other reactions under homogeneous conditions in supercritical...

Claims

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Application Information

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IPC IPC(8): C02F1/74C01B3/32
CPCY02P20/54
Inventor 王树众王玉珍郭洋徐东海公彦猛唐兴颖张洁
Owner XI AN JIAOTONG UNIV
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