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Supercritical water treatment device and method

A technology of supercritical water and treatment device, applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of increasing the difficulty of liquid discharge and increasing the energy consumption of the system

Active Publication Date: 2013-04-10
ENN ENVIROTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The reactor is in the form of a sleeve, and the outer sleeve is evaporating wall water. The temperature of the evaporating wall water is lower than the reaction temperature. The low-temperature water directly enters the reaction area to absorb the reaction heat significantly, which improves the energy consumption of the system.
In addition, the liquid product is discharged from the bottom upwards through the transfer pipeline, which makes it more difficult to discharge the liquid

Method used

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  • Supercritical water treatment device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] like figure 1 Shown, a kind of supercritical water treatment device, described device comprises:

[0080] Housing 7, made of pressure-resistant material, has an upwardly facing open end;

[0081] The top cover 2 is arranged on the top of the housing 7 and is flanged to the top to form a chamber with the inner wall of the housing 7; the flange connection is composed of fastening bolts 3 and connecting flanges 4 Assembled;

[0082] The inner sleeve 12 is made of temperature-resistant material, and is fixedly sleeved on the bottom of the chamber. There is an annular chamber between the inner sleeve 12 and the housing 7, and the annular chamber and the The chamber is in fluid communication; the inner sleeve 12 is fixed on the inner wall of the housing 7 through the bracket 8;

[0083] The oxidant inlet 10 is arranged through the bottom of the housing 7 and is in fluid communication with the chamber for allowing the oxidant to enter the inner sleeve 12; an oxidant distrib...

Embodiment 2

[0092] The present embodiment device is the same as embodiment 1, as figure 1 shown.

[0093] Use attached figure 1 The device performs supercritical treatment on waste water. Wastewater with a COD of 30258mg / L preheated to 250°C is used as raw material A and enters the inner sleeve 12 from the raw material inlet 11, and the inlet pressure of the waste water is 24~25MPa. The air with an inlet pressure of 22.5~25MPa and a temperature of 240°C is used as the oxidant B and enters the inner sleeve 12 through the oxidant inlet 10, and forms a spray state through the oxidant distribution hole 16 on the oxidant distributor 15, and the oxygen consumption is 120% of the COD value of the raw wastewater. %. After the air and waste water are mixed, a violent oxidation reaction releases heat, so that the temperature inside the inner sleeve 12 reaches 420° C., making the mixture a supercritical water state, and a supercritical water oxidation reaction occurs. The reaction product is in ...

Embodiment 3

[0096] The difference between the device in this embodiment and the device in Embodiment 1 is that the part of the outer wall of the housing 7 surrounded by the cooling system is provided with a penetration hole 17 for the cooling medium to enter the chamber. The cooling medium inlets 6 are arranged as three inlets on the same side, and one cooling medium outlet 13 is arranged on the other side. like figure 2 shown.

[0097] Use attached figure 2 The device performs supercritical treatment on the coal-water slurry. Waste water with a concentration of 35% preheated to 500°C is used as raw material A and enters the inner sleeve 12 from the raw material inlet 11, and the inlet pressure of the coal-water slurry is 28-30 MPa. The oxidant B is a mixture of supercritical water and oxygen with a ratio of 5:1, the inlet pressure is 30~34MPa, and the temperature is 380°C. In the injection state, the amount of oxidant used is 7% of the oxygen demand for the complete combustion of o...

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Abstract

The invention relates to a supercritical water treatment device and a supercritical water treatment method. The device comprises a shell and a top cover which is in sealing connection with the shell; an inner sleeve is arranged in the device; the bottom and the side wall of a reactor are provided with an oxidizing agent inlet, a raw material inlet and a solid product outlet; the top cover is provided with a gas product outlet; and the outer wall of the shell is also provided with a cooling system. The method comprises the following steps: after performing supercritical oxidation reaction on raw materials and an oxidizing agent in the inner sleeve, enabling the obtained product to move upwards to the cooling system to be in a subcritical state so as to implement separation of a solid-liquid product and a gas product; and then respectively discharging the solid-liquid product and a gas product from the corresponding outlets. The supercritical water treatment device can reach and even exceed the level of an existing supercritical water reaction device in the aspect of technical effect and has removal rate of COD (Chemical Oxygen Demand) in wastewater and slurry, can improve content of methane in gas generated after biomass and the like are subjected to supercritical oxidation reaction, and can carry out resource utilization.

Description

technical field [0001] The invention relates to the technical field of supercritical water, in particular to a supercritical water treatment device and method. Background technique [0002] Supercritical water (SCW: above 374°C / 22.1MPa) has completely different physical and chemical properties from water at normal temperature and pressure, such as large specific heat capacity, high heat transfer coefficient, large diffusion coefficient, high ion product, low viscosity, dielectric The constant is small, the ionization constant is small, the density is small and changes with pressure, and it is completely miscible with organic matter and gas. Therefore, SCW has broad application prospects in the fields of environmental protection, chemical industry, coal gasification, nuclear power and thermal power, and new material synthesis. However, at present, SCW has only been successfully applied in the thermal power industry, and its promotion in other fields is still in the tentative...

Claims

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Application Information

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IPC IPC(8): C02F1/72
Inventor 程乐明王青张玉宝谷俊杰宋成才刘扬曹雅琴高志远
Owner ENN ENVIROTECH CO LTD
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