本文選題：鍋爐管 + 激光熔覆��； 參考：《華北電力大學(xué)(北京)》2014年碩士論文

【摘要】：循環(huán)流化床鍋爐因其具有燃燒效率高、燃料適應(yīng)性廣、節(jié)能環(huán)保等一系列優(yōu)點(diǎn),在我國的火力發(fā)電行業(yè)中占據(jù)著重要的地位。水冷壁管的高溫磨損一直是循環(huán)流化床鍋爐運(yùn)行中普遍存在的重要問題,磨損不僅造成電廠巨大的經(jīng)濟(jì)損失,而且易發(fā)生因水冷壁突發(fā)性爆管而非正常停爐的重大安全事故。激光熔覆技術(shù)具有能量密度高、稀釋率低、熔覆層與基體冶金結(jié)合、對(duì)工件熱影響極小等優(yōu)點(diǎn),在工業(yè)中得到了愈來愈廣泛應(yīng)用。但在火電廠鍋爐四管防磨技術(shù)方面,激光熔覆技術(shù)的研究和應(yīng)用還甚少。本文基于Nd:YAG固體激光器的工作特性,系統(tǒng)設(shè)計(jì)了管道熔覆工作臺(tái),該工作臺(tái)主要包括電機(jī)、變速器、控制模塊、防變形裝置等部分。設(shè)計(jì)了鍋爐管防變形裝置,基于一維桿件模型,分析了鍋爐管在防變形桿件預(yù)應(yīng)力作用下的應(yīng)力與位移的關(guān)系,并將理論結(jié)果與數(shù)值模擬結(jié)果進(jìn)行了比較。實(shí)驗(yàn)表明,管道熔覆平臺(tái)設(shè)計(jì)合理,參數(shù)穩(wěn)定；鍋爐管定位準(zhǔn)確,拆卸較為靈活,可實(shí)現(xiàn)對(duì)6m長鍋爐管的連續(xù)熔覆。利用自行設(shè)計(jì)的激光熔覆系統(tǒng),研究了不同工藝參數(shù)所制備Cr3C2-NiCr熔覆層的特性。結(jié)果表明,在最佳參數(shù)下,熔覆層厚度可達(dá)lmm,熔覆層致密、與基體材料呈冶金結(jié)合。對(duì)耐磨鍋爐管取樣進(jìn)行熔覆層硬度分析表明,在距離表面700μm以內(nèi)的位置,顯微硬度在1000-1150HV范圍。對(duì)熔覆層的XRD分析表明,熔覆層的主要相為Cr3C2、Cr7C3、NiCr。
[Abstract]:Circulating fluidized bed boiler (CFB) has a series of advantages such as high combustion efficiency, wide fuel adaptability, energy saving and environmental protection, which plays an important role in thermal power generation industry in China. The high temperature wear of water wall tube is always an important problem in circulating fluidized bed boiler operation. It not only causes huge economic loss in power plant, but also leads to serious safety accidents caused by sudden tube explosion of water wall instead of normal shutdown. Laser cladding technology has been widely used in industry because of its advantages of high energy density, low dilution rate, combination of cladding layer with matrix metallurgy and minimal thermal effect on workpiece. However, the research and application of laser cladding technology are few. Based on the working characteristics of Nd:YAG solid-state laser, a pipe cladding table is designed in this paper, which includes motor, transmission, control module, anti-deformation device and so on. The anti-deformation device of boiler tube is designed. Based on one-dimensional member model, the relationship between stress and displacement of boiler tube under prestressing force of anti-deformation rod is analyzed, and the theoretical results are compared with the numerical simulation results. The experimental results show that the pipe cladding platform has reasonable design, stable parameters, accurate positioning of boiler tubes, flexible disassembly, and the continuous cladding of 6m long boiler tubes can be realized. The characteristics of Cr3C2-NiCr cladding coating prepared by different process parameters were studied by using the laser cladding system designed by ourselves. The results show that the thickness of the cladding layer can reach lmm under the optimum parameters and the cladding layer is compact and metallurgical combined with the substrate material. The hardness analysis of the cladding layer for the sample of wear-resistant boiler tube shows that the microhardness is in the range of 1000-1150HV within 700 渭 m from the surface. The XRD analysis of the cladding shows that the main phase of the cladding is Cr3C2Cr7C3NiCr.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM621.2;TN249

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 黃素華;陳海峰;殷慶華;莊R，

本文編號(hào)：1812654