DG1025/18.2-Ⅱ8型锅炉提升再热汽温

某公司1号机组低负荷工况下运行,主汽温能达到设计值,再热汽温偏低,主汽温与再热汽温温差较大,对机组运行安全性及经济性有较大影响。为了提高再热汽温,减小主、再热汽温偏差,提高机组运行的安全性和经济性,创新性的采取同步在锅炉燃烧器区域水冷壁管表面敷设卫燃带,在前大屏过热器及后屏过热器管表面喷涂KR型隔热材料,多措并举,实施改造后再热汽温提升明显,为同类机组提升再热汽温改造提供了一条行之有效的途径。

Effect of TiO_2 content on properties of Al_2O_3 thermal barrier coatings by plasma spraying

Al2O3 thermal barrier coatings with different TiO2 contents were deposited on 6061 aluminum alloy by plasma spraying. The corrosion resistance, thermal insulation property and phase composition of these coatings were investigated. The results indicate that all the feedstock powders exhibit phase transformation during the spray process. With the increase of the TiO2 content in the powder, the corrosion resistance of the coating is enhanced but the thermal insulation property is decreased. This can be attributed to the higher thermal conductivity but lower melting point and brittleness of TiO2 than those of Al2O3, so it is easy for TiO2 to disperse in the brittle Al2O3 substrate during spraying, in which these dispersively distributed TiO2 play the role of hole sealing, releasing stress and reducing cracks.

绿色巷道围岩降温技术

通过分析国内外高温热害矿井的研究现状及热害治理措施,提出了采用在巷道内壁喷涂隔热材料降温的方法,并通过实验得出降温效果明显。该方法适合于围岩散热为主要热源的矿井,对高温矿井热害治理、改善井下作业环境具有重要意义。