Demonstration Test on Concrete With Epoxy Resin Coating Using Ultra-High Pressure Water Jet Decontamination Technology

2013 ◽  
Author(s):  
Akihiro Tagawa ◽  
Masashi Tezuka ◽  
Yoshihiro Terakura ◽  
Masayuki Naitou ◽  
Kenji Miyazima
Keyword(s):  
High Pressure ◽  
Nuclear Power ◽  
Power Plants ◽  
Water Pressure ◽  
Decontamination Factor ◽  
Water Jet ◽  
Ultra High Pressure ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
The Impact

It is one of the most urgent issues to remediate the nuclear power plants contaminated by radioactive materials discharged following the accident at the TEPCO’s Fukushima Daiichi NPS. Concrete walls of nuclear power plants in Japan are coated an epoxy resin coating for easily performing decontamination. We experimented a cutting test in Fugen Decommissioning Engineering Center using maximum 280MPa pressure and 30L/min water quantity, ultra-high pressure water jet system and 40m3/min air quantity vacuum system. We are conducting a study of decontamination technology in environmental pollution using this decontamination system. This decontamination system has achieved a decontamination factor 10 to 100. In environment experiments, we achieved more than 10 decontamination factor in water pressure of more than 150MPa. Thus, we have confirmed the change in a cutting ability by changing parameters. Parameters are the water pressure, the water quantity and air quantity. The impact force for water jet is a function that contains the test parameters. We have considered it using this function. The results of the test showed that there is a correlation between the impact force for water jet and a cutting capability. This decontamination technology can decontaminate radioactive material of the surface adhesion contamination and reduce the amount of waste generated for a thin cutting. In addition, we have experimented that the water can be recycled by chemical precipitation. After we experimented flocculation test using aluminum sulfate and zeolite flocculant, we have confirmed that it. can clean water up to the level of suspended solids 5mg/L, in turbid water using zeolite flocculant. This suspended solids concentration can be passed to the water processing system in nuclear power plant. From the test results, we found that ultra-high pressure water jet decontamination technology has a possibility that it can be used for decontamination of Fukushima Daiichi nuclear power plant.

scholarly journals Analysis on the Shape and Impact Pressure of the High-Pressure Water Jet during the Hydraulic Flushing Cavity Technique

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Shouqing Lu ◽  
Chengfeng Wang ◽  
Wei Wang ◽  
Mingjie Li ◽  
Dongti Zhang
Keyword(s):  
High Pressure ◽  
Rotation Speed ◽  
Water Pressure ◽  
Water Jet ◽  
Impact Pressure ◽  
Coal Seams ◽  
Soft Coal ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
The Impact

A large proportion of minable coal seams in China belong to low-permeability soft coal seams. Such coal seams suffer serious coal and gas outburst hazards and endure a high incidence of major disasters in coal mines. The adoption of the high-pressure water jet (HPWJ) hydraulic flushing cavity can effectively promote the gas drainage efficiency and volume and eliminate the hidden danger of gas disasters. Nevertheless, the shape and impact pressure of rotating HPWJ are rarely researched. In this study, on the basis of the numerical simulation, the axial and radial stress distributions of HPWJ and the energy-gathering effect of a conical-cylindrical combined nozzle were analyzed. It is concluded that the submerged condition will accelerate the attenuation of jet velocity and reduce the impact strength of the jet. The jet diffusion angle grows with the increases in the nozzle diameter and water pressure, and 24° is the optimal contraction angle. Finally, the influences of factors such as the rotation speed on the shape and impact pressure of HPWJ were explored, and the results show that the rotation speed should be controlled within 90 r/min. The research findings lay the foundation of the study on the mechanism of coal crushing by HPWJ and provide technical support for the research and development of drilling and flushing integrated equipment.

Software Technology Research on Control System of Ultra High Pressure Water Jet Rust Removal Equipment

2013 ◽  
Vol 721 ◽  
pp. 372-376 ◽  
Author(s):  
Ling Sun ◽  
Yong Jun Gong ◽  
Zeng Meng Zhang ◽  
Zu Wen Wang
Keyword(s):  
High Pressure ◽  
Control System ◽  
Water Jet ◽  
Ultra High Pressure ◽  
Plc Control ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Hardware Circuit ◽  
Ship Repair ◽  
Removal Equipment

Ship rust removal is an import part of ship-repair and shipbuilding process. Using high pressure water jet equipment causes no environmental pollution. The control and detection of high pressure water jet equipment is the key technology to ensure the system works properly. This study, in light of research on software programming of control system of ultra high pressure water jet ship rust removal equipment, establishes a control system based on PLC through the analysis of the structure and principles of the ultra-high pressure water jet equipment. On the basis of designing hardware circuit of PLC control system, this study mostly analyses software program, and experimental test suggests that the software programming can meet the requirements of system security.

Hardware Technology Research on Ultra-High Pressure Water Jet Ship Rust Control System Based on PLC

2013 ◽  
Vol 365-366 ◽  
pp. 812-816
Author(s):  
Ling Sun ◽  
Yong Jun Gong ◽  
Zeng Meng Zhang ◽  
Zu Wen Wang
Keyword(s):  
High Pressure ◽  
Control System ◽  
Frequency Control ◽  
Water Jet ◽  
Ultra High Pressure ◽  
Frequency Control System ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
And Control ◽  
Removal Technique

Ultra-high pressure water jet ship rust is one development direction of ship rust removal technique. In order to ensure the normal working of the system, how to control each equipment is the key-part of the design. This study presents the analytical research on hardware technology of the control system of ultra-high pressure water jet ship rust system, the analysis of the principle of frequency control system and circuit design and control circuit of PLC, by analysis the structure and principles of ultra-high pressure water jet rust, and then demonstrates through experimental test that the hardware electronic circuit works properly.

Cavitation desulfurization in vulcanized rubber recycling under ultra-high pressure water jet

2017 ◽  
Vol 37 (5) ◽  
pp. 529-536
Author(s):  
Shouxu Song ◽  
Hui Zha ◽  
Haihong Huang
Keyword(s):  
High Pressure ◽  
Water Jet ◽  
Bubble Collapse ◽  
Infrared Spectrometry ◽  
Rubber Powder ◽  
Ultra High Pressure ◽  
Vulcanized Rubber ◽  
Gel Fraction ◽  
Pressure Water ◽  
High Pressure Water Jet

Abstract Ultra-high pressure water jet is proposed for recycling of vulcanized waste rubber, and cavitation desulfurization in the recycling process is analyzed. The chemical effects of mechanical shearing, pyrolysis, free radical oxidation, and supercritical oxidation produced by bubble collapse are considered the main causes of desulfurization. Scanning electron microscopy, Fourier transform infrared spectrometry, differential scanning calorimetry, nuclear magnetic resonance test, and X-ray photoelectron spectroscopy are used to determine the performance of rubber powder. Gel fraction of rubber powder is measured to analyze the effect of jet pressure on desulfurization. Results indicate that the vulcanized rubber could achieve partial desulfurization. The glass transition temperature of the rubber powder slightly increases after crushing. With the increase of jet pressure, the gel fraction of rubber powder initially decreases and then increases, as well as achieves a minimum value at the jet pressure of nearly 220 MPa, which is ideal for desulfurization.

Mechanism and experimental investigation of ultra high pressure water jet on rubber cutting

2014 ◽  
Vol 15 (9) ◽  
pp. 1973-1978 ◽  
Author(s):  
Yi Hu ◽  
Yong Kang ◽  
Xiao-Chuan Wang ◽  
Xiao-Hong Li ◽  
Xin-Ping Long ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
High Pressure ◽  
Water Jet ◽  
Ultra High Pressure ◽  
Pressure Water ◽  
High Pressure Water Jet

The Measurement of the Velocity Outside the High Pressure Water Jet and Abrasive Water Jet Nozzle Based on the Energy Transfer Method

2010 ◽  
Vol 135 ◽  
pp. 361-364 ◽  
Author(s):  
Rong Guo Hou ◽  
C.Z. Huang ◽  
H.T. Zhu ◽  
Z.W. Niu
Keyword(s):  
High Pressure ◽  
Energy Transfer ◽  
Water Jet ◽  
Abrasive Water Jet ◽  
Impact Forces ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Transfer Method ◽  
The Impact ◽  
Core Part

The energy transfer method is used to measure the flow velocity of the outside the high pressure water jet (WJ) and Abrasive water jet (AWJ) nozzle. The impact forces of the flow measured by the piezoelectricity ergometer will be transformed to the velocity value, the average velocity of the flow outside the nozzle will be obtained. The result indicates the velocity will reduce along the direction of the flow, and the velocity of the AWJ flow will reduced greatly than the WJ flow, which indicates that the length of the core part of the AWJ flow is shorter than the WJ Flow, the stand-off should be within the 0mm-15mm ranges to gain the most effective machining.

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