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At present, there are two basic forms of supercritical water oxidation reaction system
.
One is the ground system; the other is the underground system
The tubular reactor is the most common reactor.
The tank reactor can be used to treat salt-containing wastewater.
The salt is not under supercritical conditions and stays at the bottom of the tank and can be discharged
.
Figure 2-4 Types of supercritical water oxidation device
TWR is designed based on the principle of steam turbine.
The evaporative wall reactor is equipped with a porous inner tube in the tubular reactor.
①Etched orifice plate designed by Mueggenburg et al.
It uses etching technology to engrave small holes with certain rules on a multi-layer (generally 7-layer) stainless steel sheet.
The properties of the small holes on each layer are different, and then these The thin plates are pressed together and rolled into the porous inner tube of the reactor
.
This porous inner tube is mainly processed and produced by Aerojet in the United States
②The porous tube with powder sintered tube structure can be either a stainless steel powder sintered tube or a ceramic tube
.
ETH Zurich University in Switzerland uses alloy steel 625 powder sintered tube as the porous inner tube, while CEA in France uses a alumina ceramic tube
The feeding method of supercritical water oxidation is divided into batch type and continuous type.
ShanabLeh et al.
designed a continuous flow reaction device.
As shown in Figure 2-5, the core of the reaction device is a high temperature composed of two centripetal stainless steel tubes.
In the high-pressure reactor, the treated waste water or sludge is first homogenized, and then a small high-pressure pump is used to transport it from the upper part of the outer tube of the reactor to the high-pressure reactor; the waste liquid entering the reactor is first preheated and is moving When it reaches the middle of the reactor, it is mixed with the added oxidant, and the waste liquid is processed through the oxidation reaction
.
The resulting product enters the heat exchanger from the inlet of the inner tube at the lower end of the reactor