De- and rehydration of Ca(OH)2 in a reactor with direct heat transfer for thermo-chemical heat storage. Part B: Validation of model

The influence of gas–solid reaction kinetics in models of thermochemical heat storage under monotonic and cyclic loading

“…In order to investigate the influence of the various kinetic models, a lab scale reactor described previously [10,24,8] was modelled. The reactive bed in the cylindrical reactor had a diameter of 0.055 m and a length in the gas flow direction of 0.08 m. To limit computing time, only the reactor midline was represented using a 1D model.…”

“…[7]) to describe chemical reactions. Others explicitly accounted for the chemical reaction by implementing kinetic equations of varying complexity [8][9][10][11]. The extent to which the choice of a particular kinetic model influences the results of macroscopic simulations of direct thermochemical heat storage reactors using porous media theories is unknown.…”

Multi-physical continuum models of thermochemical heat storage and transformation in porous media and powder beds—A review

“…[84]) or employing power-law schemes (cf. [85]), and several publications report on the use of finite element methods and mixed finite element methods [86][87][88][89]. The ordinary differential equations (ODE) in time emanating from the spatial discretisation have been solved, e.g., using forward Euler (cf.…”

“…Validation of a numerical model similar to the previous one [98] was presented in Schaube et al [87] based on an extensive experimental characterisation of a laboratory scale (60 g of material) CaO/Ca(OH) 2 reactor [177]. The comparison to experimental data concentrated on heat transfer, integral reaction rate and maximum temperatures during the exothermic hydration reaction.…”

“…Based on the model and numerical implementation developed in Nagel et al [88], an open and direct CaO/Ca(OH) 2 reactor was simulated in Shao et al [179] using a one-dimensional model. Constitutive specifications of the model from its general state [88] were included based on experimental data and combined numerical-experimental work of a similar modelling approach [98,87,177]. Both the charging and discharging of the reactor was simulated.…”