本文選題：熱化學(xué)反應(yīng)法 + 復(fù)合陶瓷涂層　； 參考：《中國計(jì)量學(xué)院》2016年碩士論文

【摘要】：針對鍋爐受熱面的結(jié)渣和高溫腐蝕問題,采用熱化學(xué)反應(yīng)法在鋼材表面制備了一種復(fù)合陶瓷涂層,對該涂層進(jìn)行了抗熱震、抗高溫氧化、抗熔鹽腐蝕、發(fā)射率以及熱導(dǎo)率等性能試驗(yàn)。并用Fluent模擬在鍋爐不同區(qū)域噴涂涂層后對于鍋爐爐膛換熱性能的影響,確定最佳噴涂位置,為工程應(yīng)用提供指導(dǎo)。首先,分別在5種鍋爐常用鋼材(20G、12Cr1MoVG、15CrMoG、T91、TP347)制備了復(fù)合陶瓷涂層,并通過SEM結(jié)合EDS等技術(shù)手段對涂層樣片進(jìn)行微觀形貌、物相組成等分析。對涂層樣片進(jìn)行了抗熱震性能、抗高溫氧化性能、抗熔鹽腐蝕性能、發(fā)射率、熱導(dǎo)率的性能測試。試驗(yàn)結(jié)果表明:涂層具有較好的抗熱震性能,隨著涂層厚度增加,抗熱震性能呈線性下降;涂層抗高溫氧化性能較基體鋼材有較大提升;涂層抗熔鹽腐蝕性能較基體鋼材有一定提升;涂層樣片紅外波段發(fā)射率達(dá)到0.9;涂層樣片與鋼材樣片熱導(dǎo)率接近。其次,對一臺670 t/h鍋爐的水冷壁與大屏部分區(qū)域噴涂涂層,實(shí)際運(yùn)行出現(xiàn)過熱蒸汽欠溫問題,針對這一問題,使用Fluent進(jìn)行鍋爐數(shù)值模擬,研究表明:在水冷壁噴涂復(fù)合陶瓷涂層后吸熱量增加導(dǎo)致過熱器吸熱量不足,從而導(dǎo)致過熱蒸汽欠溫問題。通過改變爐膛水冷壁及過熱器復(fù)合陶瓷涂層面積進(jìn)行數(shù)值模擬,結(jié)果表明:在水冷壁噴涂面積基礎(chǔ)上增加過熱器噴涂面積可以提高過熱器吸熱量,從而保證過熱蒸汽溫度,同時(shí)降低爐膛出口煙溫。本文也對在大屏過熱器上全部噴涂陶瓷涂層的條件下,改變磨煤機(jī)投運(yùn)層數(shù),即改變火焰中心高度進(jìn)行數(shù)值模擬。
[Abstract]:In order to solve the problem of slagging and high temperature corrosion of boiler heating surface, a kind of composite ceramic coating was prepared on steel surface by thermal chemical reaction method. The coating was subjected to thermal shock resistance, high temperature oxidation resistance and molten salt corrosion resistance. Emissivity, thermal conductivity and other performance tests. Fluent is used to simulate the influence of sprayed coating on the heat transfer performance of boiler furnace after spraying in different areas of boiler. The optimum spraying position is determined and the guidance for engineering application is provided. Firstly, composite ceramic coatings were prepared in five kinds of common boiler steels, such as 20G / 12Cr1MoVG / 15CrMoG / T91 / TP347). The microstructure and phase composition of the coating samples were analyzed by means of SEM and EDS. The thermal shock resistance, oxidation resistance, molten salt corrosion resistance, emissivity and thermal conductivity of the coating samples were tested. The results show that the coating has better thermal shock resistance, and the thermal shock resistance decreases linearly with the increase of coating thickness, and the high temperature oxidation resistance of the coating is much higher than that of the substrate steel. The corrosion resistance of the coating is better than that of the steel substrate. The infrared emissivity of the coating sample is 0.9.The thermal conductivity of the coating sample is close to that of the steel sample. Secondly, for a 670 t / h boiler with spray coating on the water wall and part of the large screen, the problem of overheated steam undertemperature appears in actual operation. In view of this problem, the boiler is simulated numerically by fluent. The results show that the increase of the heat absorption of the superheater after spraying the composite ceramic coating on the water wall leads to the undertemperature of the superheated steam. By changing the area of water wall and superheater composite ceramic coating in furnace, the results show that increasing the spray area of superheater on the basis of spraying area of water wall can increase the heat absorption of superheater and ensure the superheated steam temperature. At the same time, the flue gas temperature of furnace outlet is reduced. In this paper, numerical simulation is also carried out to change the number of pulverizer layers, that is, the height of flame center, when all ceramic coatings are sprayed on the large screen superheater.
【學(xué)位授予單位】：中國計(jì)量學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TK223;TG174.4

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