The possibility of converting low-caloric fuels into synthesis gas by their partial oxidation in a moving porous layer of a granular heat carrier is theoretically studied. The process is considered in a new version of the reactor with a counterflow of a solid granular heat carrier and reacting gases. A feature of the reactor is the presence of an additional heat exchanger, where the oxidizer gas is preheated due to the residual heat of the solid heat carrier discharged from the reactor. Theoretically, in the approximation of the absence of heat loss and established thermodynamic equilibrium in the products, the macrokinetic modes of the process are considered depending on the main control parameters: the flow rate of the oxidizer gas, the flow rate of steam, the flow rate of the solid heat carrier, and the fuel composition. A quantitative calculation of the temperature and composition of the products in various combustion modes is carried out for the air-steam conversion of isopropanol and the air conversion of low-caloric pyrolysis gas. It is shown that the scheme under consideration provides a possibility to convert low-caloric gas at a temperature above 1500 K with a chemical efficiency of gasification over 90%.

The 3D flow of monodisperse spherical viscoelastic particles with Coulomb friction in a cylindrical hopper with a conical discharger has been simulated using the discrete element method. According to...

An experimental investigation into the conversion of ethanol to syngas by partial oxidation in a non-premixed counterflow moving bed filtration combustion reactor was carried out. Regimes of conversion depending on the mass flow rates of fuel and air (separate feeding), as well as a granular solid heat carrier, were studied. Depending on the mass flow rate of the heat carrier, two combustion modes were realized—reaction trailing and intermediate—with different temperature patterns in the gas preheating, combustion, and cooling zones along the reactor. The product gas composition is far from the predictions of the equilibrium model; it contains substation fractions of methane and ethylene. Combustion temperature and conversion are limited by the relatively high level of heat loss from the laboratory-scale reactor. The effect of the heat loss can be reduced by enhancing the absolute flow rate of the reactants.