焦炉上升管抗结焦陶瓷涂层制备与性能研究
发布时间：2018-11-11 16:38
【摘要】：焦炉在正常生产过程中,其上升管道内壁不断积聚碳物质直接阻碍荒煤气正常输送,降低焦炉生产效率,是一直以来亟待解决的难题。本文通过研究在上升管道金属内壁上制备陶瓷涂层抑制其表面积碳结焦,减少碳质层的附着量,以达到提高焦炉生产效率的目的。课题研究过程中,通过热力学理论的计算确定了SiO2、Cr2O3作为陶瓷涂层的主要组分;依据陶瓷涂层与金属基体热膨胀系数相互匹配的原则,设计确定了采用高温液相烧结的方式在Cr20Ni25耐热合金钢表面制备陶瓷涂层。在具体的试验中,采用控制变量的研究方法,遵循单一变量的原则,分别探讨涂层料浆的制备、烧成工艺、力学性能以及陶瓷涂层的抑制结焦性能四个方面来进行本课题的研究工作。研究结果表明:(1)陶瓷涂层料浆内固体颗粒细度、固相含量、助剂加入种类以及数量均对料浆各项性能以及涂层的烧成产生重要影响。涂层料浆内固相含量52.63%、料浆颗粒D50为1.659μm,并加入部分化学助剂时料浆各项性能达到最优。(2)烧成工艺直接影响陶瓷涂层各项性能的优劣,烧成温度越高,陶瓷粉料收缩越大,涂层与金属基体的结合效果越差。当涂层内部含有20%Cr2O3,热处理温度在1090℃下保温20min时,陶瓷涂层光滑致密,与金属基体结合效果最好。(3)陶瓷涂层具有良好的抑制碳结焦性能。涂层表面所结的碳质层结构与未涂陶瓷涂层的金属基体表面的碳质层相比结合松散,很容易脱落。另外,陶瓷涂层厚度不是影响其抑制碳结焦性能的关键因素。
[Abstract]:During the normal production of coke oven, the accumulation of carbon in the inner wall of the rising pipe directly hinders the normal transportation of waste gas and reduces the production efficiency of coke oven, which has always been a difficult problem to be solved. In order to improve the production efficiency of coke oven, ceramic coating was prepared on the metal inner wall of riser pipe to restrain the coking on the surface and reduce the adhesion of the carbon layer. In the course of the research, SiO2,Cr2O3 as the main component of ceramic coating was determined by the calculation of thermodynamic theory. According to the matching principle of thermal expansion coefficient between ceramic coating and metal substrate, ceramic coatings were designed and fabricated on the surface of Cr20Ni25 heat-resistant alloy steel by high temperature liquid phase sintering. In the concrete experiment, the research method of controlling variable and following the principle of single variable are used to discuss the preparation and sintering process of coating slurry. The mechanical properties and coking resistance of ceramic coatings were studied in this paper. The results show that: (1) the fineness of solid particles, the content of solid phase, the type and quantity of additives in the slurry of ceramic coating have important effects on the properties of slurry and the sintering of coating. The solid content in the coating slurry is 52.63, the slurry particle D50 is 1.659 渭 m, and some chemical aids are added to the slurry. (2) the sintering process directly affects the properties of the ceramic coating, and the higher the sintering temperature, the higher the sintering temperature. The larger the shrinkage of ceramic powder, the worse the bonding effect between coating and metal substrate. When the coating contains 20 Cr _ 2O _ 3 and the heat treatment temperature is 1090 鈩，
本文编号：2325475
[Abstract]:During the normal production of coke oven, the accumulation of carbon in the inner wall of the rising pipe directly hinders the normal transportation of waste gas and reduces the production efficiency of coke oven, which has always been a difficult problem to be solved. In order to improve the production efficiency of coke oven, ceramic coating was prepared on the metal inner wall of riser pipe to restrain the coking on the surface and reduce the adhesion of the carbon layer. In the course of the research, SiO2,Cr2O3 as the main component of ceramic coating was determined by the calculation of thermodynamic theory. According to the matching principle of thermal expansion coefficient between ceramic coating and metal substrate, ceramic coatings were designed and fabricated on the surface of Cr20Ni25 heat-resistant alloy steel by high temperature liquid phase sintering. In the concrete experiment, the research method of controlling variable and following the principle of single variable are used to discuss the preparation and sintering process of coating slurry. The mechanical properties and coking resistance of ceramic coatings were studied in this paper. The results show that: (1) the fineness of solid particles, the content of solid phase, the type and quantity of additives in the slurry of ceramic coating have important effects on the properties of slurry and the sintering of coating. The solid content in the coating slurry is 52.63, the slurry particle D50 is 1.659 渭 m, and some chemical aids are added to the slurry. (2) the sintering process directly affects the properties of the ceramic coating, and the higher the sintering temperature, the higher the sintering temperature. The larger the shrinkage of ceramic powder, the worse the bonding effect between coating and metal substrate. When the coating contains 20 Cr _ 2O _ 3 and the heat treatment temperature is 1090 鈩，
本文编号：2325475
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