Xi'an Jiaotong University

Xi'an Wonfu Energy and Environment Technologies Co., Ltd.

Xingying Tang

Shuzhong Wang

Jie Zhang

Yanhui Li

Lili Qian

Panpan Sun

Yuzhen Wang

Yanmeng Gong

Mengmeng Ren

Jianqiao Yang

Donghai Xu

Laisheng Wang

A control system for decreasing pressure of a supercritical water system and a method therefor is provided, mainly including: a resistance water storage tank, a resistance pump, a capillary negative booster, a back pressure valve, a regulating valve and related stop valves. By switching the back pressure valve branch and the capillary negative booster branch, the pressure regulation is achieved while starting the system, closing down and in normal operation. The present invention is capable of achieving precisely controlling pressure of the system on the basis of effectively preventing problems exists in the solid particle materials pressure decreasing process such as abrasion and clogging of the internal elements of the valve. In addition, the back pressure valve branch is capable of reducing the operation complexity in the starting and shutdown process of the system, and the operation reliability is improved.

Control system for decreasing pressure of supercritical water system and method thereof

An intermediate medium heat exchanging device for a supercritical water oxidation system includes a material main loop, an intermediate medium loop and a replenishment branch. A material pump, a preheater, a spray desuperheater, a reactor and a regenerator are connected in sequence to form the material main loop; a buffer tank, a circulating pump, the regenerator, the preheater and a water cooler form the intermediate medium loop. A back pressure valve is located above the buffer tank. The replenishment branch includes a cooling water pump, an outlet of the cooling water pump is divided into two sub-branches, one sub-branch is connected with the spray desuperheater, and another sub-branch is connected with the buffer tank. The intermediate medium heat exchanging device is reasonable in structural design, and is able to maximumlly reduce the investment cost and ensure the stable operation of the system.

Intermediate medium heat exchanging device for supercritical water oxidation system

A radial flow hydrothermal reactor for a sludge thermal hydrolysis treatment is provided. An outer and an inner cylinder are successively sleeved in a cylindrical body of the reactor. A guiding cylinder is arranged between the outer and the inner cylinder. Guiding pipes are provided on the guiding cylinder. An agitator is arranged in the inner cylinder, so that sludge has low viscosity and good fluidity after reaching reaction parameters. Because an inlet pipe is arranged below the inner cylinder, the sludge enters the inner cylinder from bottom and flows out from top, and the inner cylinder has a diameter not large, which guarantees heating time. Because of a small height-to-diameter ratio of the reactor, the sludge after heating has the good fluidity, and flows outward radially in the outer cylinder. With an increased flowing radius, a flowing velocity decreases, and a hydrothermal reaction proceeds continuously, which guarantees reaction time.

Radial flow hydrothermal reactor for sludge thermal hydrolysis treatment

A sludge dehydrating system and a method thereof based on a thermal hydrolysis technology include: a homogeneous slurry unit, a hydrothermal unit, a flash reactor, a waste heat recovery unit, and a dehydrator; wherein a viscosity of sludge is lowered by homogenously slurrying before entering a pump, which is conducive to transportation; a sludge tank firstly crashes and then quantitatively transports for improving a homogenizing efficiency; a diluent is sludge dehydrated filtrate which is mixed with flash steam in an ejector, wherein an mixing efficiency is high; during homogenously slurrying, waste steam generated is added into a sludge diluent pipe for being absorbed; a hydrothermal unit include a variety of forms such as an intermittent form and a continuous form, in such a manner that reaction parameters, especially reaction time are effectively guaranteed; the flash steam enters the homogeneous slurry unit for heating the sludge.

Sludge dehydrating system and method thereof based on thermal hydrolysis technology

A supercritical water oxidation treatment system for organic wastewater with a high salinity crystallizes high-salinity wastewater by a low temperature of liquid oxygen, and decreases an inorganic salt content in the wastewater. Under supercritical water conditions, a hydrocyclone () separates most precipitated solid salts in the wastewater, so effectively prevents pipes and the tubular reactor () after the hydrocyclone () from plugging. Inorganic salts are able to be continuously separated from the system by the hydrocyclone () at the bottom of a desalination device, In addition, excess oxygen and gaseous products COare recovered by a separation recovery part. The reaction time and the reaction temperature of supercritical water oxidation reaction are lowered due to the installation of a simple post-treatment unit (). Moreover, the heat of the reactor effluent with a high temperature is recovered in the system, so operation cost of the system is reduced evidently.

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Shaanxi, China

Xingying Tang