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Corrosion Characteristics of 20G in the Environment of Heating Surface in Biomass Boilers
Chen Zong,Qimin Wang,Xinzhang Huang 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.7
A corrosion experiment with 20G has been carried out by simulating the environment of heating surface in biomass boilers. Corrosion dynamic curves were obtained by mass gain method. Analysis of the corrosion characteristics were combined with the surface morphology. And the surface morphology and chemical composition of the specimen after experiment were analyzed by using the energy dispersive spectrometer (EDS) and scanning electron microscopy (SEM). The result of experiment show that there is certain corrosion resistance in 20G at a temperature of 500℃, the corrosion strength of chlorine is greater than sulfur during corrosion process, and the deposition corrosion is dominant.
Gongchen Li,Qimin Li,Jian Wang,Jingmin Dong,Qiang Sun 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.3
A 40-m-deep large excavation of a subway station is relatively rare in the world. The retaining design scheme and deformation characteristics of suspended diaphragm walls with struts in rock and soil composite ground are introduced. The excavation is numerically simulated, and the reliability of the numerical model is verified by field-testing data. Then, by changing the parameters of the numerical model, the influences of the parameters on the deformation of the excavation are analysed. Research shows that the deformation characteristics of this superdeep excavation is different from the conventional foundation excavation. The superdeep excavation has a small scope of influence on the surrounding soil, the maximum lateral deformation of the supporting structure is also small, and the maximum ground settlement point is closer to the foundation pit. The most important influence on the lateral displacement of the superdeep excavation with the dual structure of rock and soil is the prestressing. The support method of the suspended diaphragm wall is reliable.
Co-Pyrolysis Characteristics of Biomass and Coal under Different Mixing Modes
Jia Hao,Qimin Wang 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.6
Biomass and coal co-pyrolysis is one of most important reactions in the co-combustion and co-gasification of them. In order to study the interaction of biomass and coal in the co-pyrolysis process, thermo gravimetric experiments of them under different mixing modes were make. The mixed modes of biomass and coal include uniformly mix and stratified layout (coal in the upper) and stratified layout (biomass in the upper). The experimental results show that: the temperature of co-pyrolysis is lower than that of coal pyroly sis separately; the co-pyrolysis reaction velocity would be accelerated or debased, that depends on the biomass components and the mixing modes; the co-pyrolysis reaction velocity of coal and sawdust would be accelerated under the condition of uniformly mix; the others would be debased. The experimental results show also that: the reaction velocities of biomasses and coal co-pyrolysis always are less than those of separately pyrolysis. This study provides the important reference and theoretical basis for biomass and coal co-combustion and co-gasification.
Analysis on Fly Ash Sediment of Biomass Fuel Boiler Heating Surface
Xiaohui Zhang,Chen Zong,Qimin Wang 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.8
According to the fuel properties of biomass (straw), it analysis the element content of the Cl, S in biomass straw and alkali meta such as K, Na and the composition of biomass (straw) and ash, meanwhile it analysis the composition of fly ash deposits sediments on heating surface of straw fuel boiler and determines the components of depositional aggressive medium and its mass ratio. A simulation corrosion test is designed base on the mass ratio and other conditions; it obtains the corrosion morphology and corrosion products by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). Finally it determines the process of alkali metal chloride deposition corrosion is mainly self catalytic oxidation corrosion.
JiCheng Ding,ChangWei Zou,QiMin Wang,Kun Zeng,SiCheng Feng 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.2
The huge potential of High-power impulse magnetron sputtering (HIPIMS) to improve the properties of deposited coatings has been verified. In this study, Ti-Si-N coatings were deposited on Si (111), glass and cemented carbide substrates by using HIPIMS. The influences of the peak voltage, duty cycle and total gas pressure on the transient peak current of the Ti90Si10 target was investigated in detailed. The (200) diffraction intensity decreased with increasing bias voltage from −50 V to −400 V. The hardness of the Ti-Si-N coatings deposited at various bias voltages and the internal stress at different bias voltages were studied. The results indicate that HIPIMS technology can considerably improve the mechanical capacity of the Ti-Si-N coatings, possibly due to the combined protection of the increased adhesive force with the substrate and the relatively high hardness, which are caused by densification and dislocation strengthening effects.