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Research on Wear Mechanism and Resistant Measures of CFB Boiler

Author: ZhangHuaLei
Tutor: LiuZongDe
School: North China Electric Power University (Beijing)
Course: Power Machinery and Engineering
Keywords: Circulating fluidized bed Wear mechanism Antiwear Measures Argon Arc Cladding Waterwall
CLC: TK228
Type: Master's thesis
Year: 2011
Downloads: 63
Quote: 0
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Abstract


Circulating fluidized bed boiler water wall tube wear is a major bottleneck currently impeding the development of circulating fluidized bed boiler , to study the wear mechanism and take effective measures the wear is now a research hotspot . This paper first analyzes the wear mechanisms of the circulating fluidized bed boiler , Baima power plant boiler actual data - based simulation of the internal flow field obtained internal flow characteristics of the flow field , wear mechanism provides a basis for further analysis . By analyzing the axial direction along the furnace pulverized coal concentration goes to dilute concentrated and pulverized coal particles along the radial direction was the ring - nuclear flow distribution . Particle velocity is higher in the central region and the upward direction , the direction of the side wall region speed down which formed the inner loop of the furnace material flow . The calculated result is consistent with the literature . Can also be seen in the the furnace corners and bottom of the dense phase pulverized coal particles speed and concentration , which is susceptible to wear and tear of the main reasons for these parts . By argon cladding methods was prepared out of the high - performance of the Fe-Cr-B -based wear - resistant cladding layer . Prepared under different current cladding cladding layer hardness and thermal the influence depth analysis . The analysis shows that : the hardness of the surface of the cladding layer is up to 1200HV, homogeneous , with the base body between the metallurgical combination . The clad layer made ??of high temperature erosion experiment results show that the wear resistance of the cladding layer 6 times, 20G steel has extremely high wear resistance in high temperature environments .

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CLC: > Industrial Technology > Energy and Power Engineering > Steam Power Engineering > Steam boiler > Repair, maintenance
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