Corrosion of high chromia refractory materials by basic coal slag under simulated coal gasification atmosphere

Spalling degradation of Cr2O3‐Al2O3‐ZrO2 refractories for coal‐water slurry gasifier linings: Role of phosphate

“…From (A) to (E) in Figure 5, it is farther and farther away from the hot face, and the virgin microstructure is shown in Figure 5F. Consistent with previous studies, 6,[12][13][14] it is typical slag penetration microstructure of high chromia brick in Figure 5A that the slag almost filled the pore of refractory, and the (Cr,Al) 2 O 3 solid solution was dismembered by the slag. And zirconia powders interspersed individually between the crystals of Cr 2 O 3 -Al 2 O 3 solid solution.…”

“…2,3 The impurities of CaO, SiO 2 , Al 2 O 3 , and FeO in coal form slag at elevated temperatures during gasification. [4][5][6] Refractories have been used as gasifier lining because the corrosion and erosion of slag on gasifier inner wall are fatal at high temperature. Moreover, some insulating refractories are used to reduce heat loss.…”

“…In the gasifier, coal‐water slurry reacts with oxygen to produce the syngas, which consists of CO and H 2 , at 1300∼1600°C and 2.0∼8.7 MPa 2,3 . The impurities of CaO, SiO 2 , Al 2 O 3 , and FeO in coal form slag at elevated temperatures during gasification 4–6 . Refractories have been used as gasifier lining because the corrosion and erosion of slag on gasifier inner wall are fatal at high temperature.…”

Effects of oxidation of SiC aggregates on the sintering behaviour and microstructures of SiC-CaAl12O19 composite refractories

“…Coal gasification is an important efficient approach to the clean utilization of coal [1]. At present, the coal gasifiers work between 1300 and 1600°C at pressures of 2-9 MPa under a strongly reducing atmosphere [2][3][4][5]. During the coal gasification process, the refractory lining of gasifiers will be attacked by the molten coal slag.…”

Process Failure Detection via Recurrence Quantification Analysis in a Slot-Rectangular Spouted Bed

“…The fly ash and corrosive sulphur gases can cause problems via fouling and corrosive failure of the heat transfer tubes of the plant economizers and air preheaters, as well as electrostatic precipitators [1,[6][7][8][9]. Within the CFB boiler itself, the thermal cycling and corrosive slag depositions on the refractory walls can lead to refractory failures and spalling, which can result in sections of the refractory detaching from the wall and falling into the boiler, mixing in with the bed material and potentially affecting the bed dynamics [1,10,11].…”