Role of fatigue in damage development of refractories under thermal shock loads of different intensity

Numerical Analysis of Fracture Failure Behavior of Refractory Lining in Coal-Water Slurry Gasifier

“…In fact, the fatigue crack growth in the hot-face brick of the coal-water slurry gasifier mainly occurs during the temperature drop after the gasifier has been stopped. ,, This is because the temperature of the hot-face brick drops faster than that of the back-up brick after the gasifier stops. This causes the cracks to be subjected to tensile stresses on both sides of the crack, resulting in crack destabilization and expansion.…”

“…Fatigue crack growth has always been the main failure mechanism for a refractory lining serving at elevated temperature and high pressure conditions, leading to early failure of the refractory lining prior to the design life. 8 − 10 This will not only affect the operation cycle and stability of the gasifier, but also cause production accidents. Therefore, determining the fracture failure of refractory lining under service loads for guiding the safe operation and timely maintenance of a CWS gasifier will be of paramount importance.…”

“…Due to its wide adaptability of raw materials, high carbon conversion rate, large capacity of single gasifier, and environmental friendliness, this technology has been widely used in electric power, petroleum, chemical, and other industries. − The refractory lining is a key component of a CWS gasifier, which can isolate elevated temperature, restrict the flow field, and resist corrosion by particles, slag, and gas. , During long-term service in a CWS gasifier, the refractory lining will inevitably initiate fatigue cracks due to the cyclic thermal shock caused by repeated heating and cooling of the gasifier. Fatigue crack growth has always been the main failure mechanism for a refractory lining serving at elevated temperature and high pressure conditions, leading to early failure of the refractory lining prior to the design life. − This will not only affect the operation cycle and stability of the gasifier, but also cause production accidents. Therefore, determining the fracture failure of refractory lining under service loads for guiding the safe operation and timely maintenance of a CWS gasifier will be of paramount importance.…”

A multilevel model for description of thermomechanical fracture of refractory linings of high-temperature equipment

“…It should be noted that elastic properties of the refractory materials have pronounced temperature dependence (Lu & Fleck, 1998). Andreev et al (2020) and Zhu et al (2017) showed that at low temperatures they are subjected to brittle or quasibrittle (fatigue) fracture, while at high temperatures stress relaxation occurs by means of plastic flow of the material (Varshneya et al, 1990, Zabolotskii, 2011. The fatigue nature of fracture of the brittle ceramics is caused by a large amount of structure defects and phase interfaces, which, on the one hand, serve stress concentrators and source of crack nucleation, but, on the other hand, are obstacles to the crack propagation, which stop it at a certain stress level (Andreev et al, 2020;Goldstein & Perelmuter,  ISSN: 2683-5894 Reports in Mechanical Engineering, Vol.…”

Computational homogenization of elastic-viscoplastic refractory masonry with dry joints

“…Refractory masonry with dry joints is extensively used for the linings of several high temperature components such as steel ladles, furnaces and rotary kilns due to their high thermal, mechanical and chemical stability, good thermo-mechanical and thermo-chemical properties [1][2][3][4][5]. When used in steel ladles, they are subjected to high thermal gradients, thermal shock, cyclic thermal heating and cooling, high thermo-mechanical stresses, slag attack, and harsh chemical environment [6][7][8][9][10][11]. Therefore, the lifespan of steel ladles internal linings is very short (several castings).…”