Dalian Boiler & Pressure Vessel Inspection & Research Institute

Dalian, China

Dalian Boiler & Pressure Vessel Inspection & Research Institute

Dalian, China
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Zhong Y.,Shandong University | Zhou C.,Dalian Boiler & Pressure Vessel Inspection & Research Institute | Chen S.,Shandong University | Wang R.,Shandong University
Chinese Journal of Mechanical Engineering (English Edition) | Year: 2017

310S is an austenitic stainless steel for high temperature applications, having strong resistance of oxidation, hydrogen embrittlement and corrosion. Stress corrosion cracking(SCC) is the main corrosion failure mode for 310S stainless steel. Past researched about SCC of 310S primarily focus on the corrosion mechanism and influence of temperature and corrosive media, but few studies concern the combined influence of temperature, pressure and chloride. For a better understanding of temperature and pressure's effects on SCC of 310S stainless steel, prepared samples are investigated via slow strain rate tensile test(SSRT) in different temperature and pressure in NACE A solution. The result shows that the SCC sensibility indexes of 310S stainless steel increase with the rise of temperature and reach maximum at 10MPa and 160℃, increasing by 22.3% compared with that at 10 MPa and 80 ℃. Instead, the sensibility decreases with the pressure up. Besides, the fractures begin to transform from the ductile fracture to the brittle fracture with the increase of temperature. 310S stainless steel has an obvious tendency of stress corrosion at 10MPa and 160℃ and the fracture surface exists cleavage steps, river patterns and some local secondary cracks, having obvious brittle fracture characteristics. The SCC cracks initiate from inclusions and tiny pits in the matrix and propagate into the matrix along the cross section gradually until rupture. In particular, the oxygen and chloride play an important role on the SCC of 310S stainless steel in NACE A solution. The chloride damages passivating film, causing pitting corrosion, concentrating in the cracks and accelerated SSC ultimately. The research reveals the combined influence of temperature, pressure and chloride on the SCC of 310S, which can be a guide to the application of 310S stainless steel in super-heater tube. © Chinese Mechanical Engineering Society and Springer-Verlag Berlin Heidelberg 2017


Ma L.,Shandong Electric Power Research Institute | Liu J.,Shandong Jianzhu University | Yan Y.,Shandong Jianzhu University | Diao X.,Dalian Boiler & Pressure Vessel Inspection & Research Institute
Advanced Materials Research | Year: 2013

Based on positional finite element method (FEM), a new, simple and accurate lumped mass matrix to solve dynamic geometrical nonlinear problems of materials applied to variable cross-section beam element has been proposed. According to Hamilton theory and the concept of Kinetic energy, concentrate the beam element mass to the two nodes in certain proportion, the lumped mass matrix is deduced. The lumped mass matrix is diagonal matrix and its calculated quantity is less than using consistent mass matrix about properties of materials under the same calculation precision. © (2013) Trans Tech Publications, Switzerland.


Song Q.-X.,Dalian Boiler & Pressure Vessel Inspection & Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2016

SA-213TP347H (Cr19Ni11Nb) steel tube with excellent high temperature lasting and high temperature antioxidation is widely used in high temperature superheater and reheater as the power boiler is marching to the ultra supercritical parameters. As the operation time increases, the abnormal shutoff of the power boiler happens more and more frequently due to oxidation skin peeling and accumulating. In this article, the causes of the TP347H oxidation skin formation, growth, pealing and accumulation in ultra-supercritical power generation boiler were investigated by the long-term sampling of TP347H steel pipe inner surface oxide skin and sample analysis. And a countermeasure of preventing and delaying the growth of spalling was put forward. © 2016, Editorial Department of "Journal of Engineering for Thermal Energy and Power". All right reserved.


Chong Y.-B.,Dalian Boiler & Pressure Vessel Inspection & Research Institute | Tang W.-Q.,Dalian Boiler & Pressure Vessel Inspection & Research Institute
Petrochemical Equipment | Year: 2013

The on-line testing technology for anticorrosive coating of buried pipelines with defects are summarized and appraised briefly. The testing principle and methods for buried pipelines with defects are mainly studied for testing equipment of SL model external anticorrosive coating testing for buried pipelines containing defects.


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.


Jiang H.-Q.,Dalian Boiler & Pressure Vessel Inspection & Research Institute
Petrochemical Equipment | Year: 2013

Based on the enstrophy and energy dissipation of the vortex theory, the mixing mechanism of a punched agitator used in solid-liquid suspension system was analyzed. The effects of the configuration parameters on stirring performance were discussed. The results showed that efflux from such punched agitator with simple structure not only strengthen vortex diffusion, but also reduce the power consumption by diminishing the projection area over the paddles. Obviously, it is beneficial to lower critical suspension velocity and promote mixing efficiency in the tank. It is indicated that the punched agitator is a better configuration with quite broad application.


Liu C.-L.,Dalian Boiler & Pressure Vessel Inspection & Research Institute | Zhong C.-L.,Dalian Boiler & Pressure Vessel Inspection & Research Institute
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2015

During the installation of a large-sized utility boiler, through a magnetic powder non-destructive inspection, a serious crack was found in the fillet welding seams between the connection tubes and the tube seats on the lower header in the rear flue gas well. Firstly, a recheck was performed of the header, tube connector, welding material and manufacturing process to make sure that all met the requirements set in relevant standards, then, a sample or specimen was cut and made at the location of the crack. Through a metallurgical test, hardness test and electronic microscope scanning test, the microorganization and morphology of the sample were analyzed and studied. The test results show that the crack pertains to a reheat-caused one. To avoid reoccurrence of this kind of cracks, the welding and after-welding heat treatment process of headers should be optimized, thus enhancing the eligibility rate of headers thus manufactured. ©, 2015, Harbin Research Institute. All right reserved.


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.


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.

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