Study of the two-stage gasification process of pulverized coal with a combined countercurrent and concurrent flow system

Abstract

Abstract. The paper presents a numerical study of an advanced two-stage gasifier with a combined countercurrent and concurrent flow pattern and dry fuel feed system EAGLE. The Reynolds Stress model was used for the numerical simulation of turbulent flow. We have conducted studies on the influence of upper burner's inclination angle on heat and mass transfer processes in the gasifier as well as on coal conversion. It is shown that the increase in the upper burner's inclination angle in the horizontal plane allows intensifying the process of two-stage gasification.

Numerical investigation of the autothermal steam-air-blown gasification of a low-grade fuel in non-stationary regimes

“…To compare the effect of various operation parameters on the heating value and H2/CO of the syngas, the results of sections 4.3.1-4.3.4 and publication data (Kiso and Matsuo 2011;Ryzhkov ey al. 2017;Kuznetsov et al 2016Kuznetsov et al , 2017Watanabe and Otaka 2006;Abaimov et al 2016) are collected in Table 4. The calculated data obtained in this study are compared with the experimental data of CKTI (Abaimov et al 2016) and MHI (Watanabe and Otaka 2006) and the calculated data of MHI (Ryzhkov ey al.…”

“…The calculated data obtained in this study are compared with the experimental data of CKTI (Abaimov et al 2016) and MHI (Watanabe and Otaka 2006) and the calculated data of MHI (Ryzhkov ey al. 2017;Kuznetsov et al 2016Kuznetsov et al , 2017 and EAGLE (Kiso and Matsuo 2011;Kuznetsov et al 2016Kuznetsov et al , 2017. In (Abaimov et al 2016), the conversion process proceeded without the addition of steam.…”

“…In (Kiso and Matsuo 2011), the operation of an EAGLE oxygen gasifier was calculated when replacing a radiation-convective gas cooler with a section of multistage water quenching. In (Kuznetsov et al 2016(Kuznetsov et al , 2017, an EAGLE oxygen gasifier was adjusted for air-blowing and the supply of superheated steam (900°C). H 2 /CO q NID q CFD q exp.…”

“…A promising way to adjust syngas composition is to change the regime of solid fuel conversion in the setup by supplying steam, which enters into an endothermic heterogeneous reaction of hydrogasification with carbon and a slightly exothermic homogeneous water-gas shift reaction (WGSR) (Kiso and Matsuo 2011;. The issue of steam and air-steam gasification in entrained-flow (Qin et al 2012;Hernández et al 2020;Crnomarkovic et al 2007;Hernández et al 2012;Kuznetsov et al 2016;Kuznetsov et al 2017;) and fluidized bed units (Abaimov et al 2023) is of interest to many researchers. Recently, the steam-blown gasification of biomass has become a popular way to obtain biodiesel that can replace traditional fossil fuels (Teoh et al 2021).…”