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Cai W.-S.,Dalian Boiler & Pressure Vessel Inspection & Research Institute
Petrochemical Equipment | Year: 2013

In order to study acoustic emission (AE) signals waveform characteristics of pitting corrosion on 304 stainless steel, wavelet transform and mode acoustic emission technology were combined to deal with recorded AE signals. The results showed that signal waveform was mainly composed of low-frequency flexural wave with larger energy and high-frequency expansion wave with lesser energy. The research results have some certain significance for AE monitoring of pitting corrosion on 304 stainless steel.

Wang S.,Dalian Boiler & Pressure Vessel Inspection & Research Institute | Wang Z.R.,Institute of Safety Engineering
Applied Mechanics and Materials | Year: 2014

This paper aims to the study of dedusting effects in confined workplace using finite volume method. First, the diffusion phenomenon of dust flow is described by discrete phase model, and the numerical results are compared with the experimental data. Second, the concentration of dust flow, which mixes with SiO2 and air, is calculated by three different dedusting methods, such as the exhaust fan method, the window ventilation method and the humidifying spray method. In terms of comparison results, the exhaust fan method has the best dust removal effect in confined workplace, and the humidifying spray method has the worst effect. The paper provides a technical support for dedusting design of confined workplace in the occupational hazards prevention field. © (2014) Trans Tech Publications, Switzerland.

Ma L.,Shandong Electric Power Research Institute | Liu J.,Shandong Jianzhu University | Diao X.,Dalian Boiler & Pressure Vessel Inspection & Research Institute | Meiling D.,Shandong Jianzhu University
Advanced Materials Research | Year: 2012

According to mechanical characteristics of space truss structure, the dynamic characteristics of boom system of crawler crane in derricking condition are simulated based on positional FEM. FEM simplified analytical method is established basing on engineering algorithm, only a few units and small amount of calculation are needed when using variable cross-section beam to simulate boom integral structure. The dynamic response time curves of boom system in derricking conditions are obtained, and compared with the existing literature. This further confirms the simplified model is feasible in theory and easy to realize in engineering, it also shows that positional FEM is feasible in dynamic analysis of complex structure. © (2012) Trans Tech Publications, Switzerland.

Zhang Z.-L.,Dalian Boiler & Pressure Vessel Inspection & Research Institute
Petrochemical Equipment | Year: 2011

The cause and influence factors of hydrogen knobbing for inner surface of the head of circumfluence tank were analyzed in the refinery. Appropriate preventive measures have been proposed to prevent a similar situation in wet hydrogen sulfide environment.

Wu K.,Huazhong University of Science and Technology | Wu K.,Dalian Boiler & Pressure Vessel Inspection & Research Institute | Liu G.F.,Huazhong University of Science and Technology | Weng J.-S.,Huazhong University of Science and Technology
Separation and Purification Technology | Year: 2016

The grade efficiency of fine particles is relatively inefficient for conventional cyclones, but the grade efficiency of the Radial Jet Cyclone (RJC) exceeds 90% for particles larger than 4 μm. The pressure drop of this cyclone is discussed based on the continuity equation, and a theoretical model is used to predict the pressure drop over the cyclone. Experimental results is in good agreement with the calculation. The inner flow field of cyclone is simulated by Reynolds Stress Model (RSM), and it indicates that there is a larger tangential velocity compared with the Stairmand Cyclone (SC) under the same inlet velocity. It reveals that the local loss in cushion chamber is in a significant proportion to pressure drop. © 2016 Published by Elsevier B.V.

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