Dynamic process simulation for Polish lignite combustion in a 1 MWth circulating fluidized bed during load changes

Numerical and experimental study of co-combustion of refuse-derived fuels in a circulating fluidized bed during load change

“…The simulation temperatures were compared with the measured values in the combustor for a very short time (30 s). Alobaid et al (Alobaid et al, 2020) developed a dynamic process simulation of a CFB furnace based on the 1-MW test facility with a high level of detail including the CBF riser, the air supply, the flue gas path, the water-cooling system, and the control structures. The numerical results are in good agreement with the measured data at various load cases.…”

“…The process simulation model was tuned with the measurement of a steady-state test point and validated with experimental data of the load cycling test. Due to the limited existing works regarding the dynamic process simulation of circulating fluidized bed boilers during part loads (Alobaid et al, 2020), particularly using alternative fuels (e.g., refuse-derived fuel), this study aims to develop a dynamic model of a fluidized bed co-combustion of lignite and RDF to investigate the flexibility of compensation for fluctuating power generation, and to increase the proportion of RDF while reducing the proportion of lignite to further reduce CO 2 emissions. For this purpose, a 1.5D dynamic process simulation model of the 1MW th circulating fluidized bed test facility at the Technical University of Darmstadt is developed in APROS, which considers the heat transfer, gas-solid interaction, and combustion.…”

“…The process simulation in this study was carried out in APROS software, which is a multifunctional simulation program developed by Fortum and the Technical Research Centre of Finland (VTT) (Haenninen, 2009;Lappalainen et al, 2014;Lappalainen et al, 2017;Hiidenkari et al, 2019;Alobaid et al, 2020). The program can simulate thermal combustion power plants, energy, and industrial processes as well as safety analysis by using specialised component libraries for the process, automation, and electrical systems.…”

“…However, the gases only flow up through the riser. In the simulation, the chemical reactions that take place in the combustion process are presented as follows (Alobaid et al, 2020):…”

Acceleration of Load Changes by Controlling the Operating Parameters in CFB Co-Combustion

“…It has been found that the thermal inertia of the furnace refractory walls has a large impact on the transient behavior of the furnace (Park and Basu, 1997;. When modeling a CFB combustor, the heat capacity and the thermal conductivity of the bed material must be modeled correctly to reflect the dynamic behavior (Zheng et al, 1997;Alobaid et al, 2020). This implies that the bed material is of great importance during load following operation.…”