Reaction of sulfur dioxide with limestone and the grain model

Abstract

Experimental measurements of the reaction of sulfur dioxide and oxygen with limestones have demonstrated substantial influence of the geologic origin of the stone, its porosity and particle size, gaseous concentration of sulfur dioxide, and temperature on the course of reaction and the conversion (that is, the degree of utilization of the limestone content of the particles as a sorbent for sulfur dioxide). A mathematical model including intraparticle transport and chemical reaction within the particles (grain theory) has been developed to simulate this sulfur dioxide sorption reaction.

A grain size distribution model for non-catalytic gassolid reactions

“…V sol Jeac (3) It is assumed here that the density of impurities in the grain is equal to that of the solid reactant. Combination of eqns.…”

Modelling of the kinetics of sulphation of CaO particles under CaL reactor conditions

“…There is a large background of literature on the sulphation of CaO particles under combustion conditions [26][27][28][29][30][31][32][33][34][35][36][37][38][39]. However, there are several novel features in the CaL system of Figure 1 that have not yet been sufficiently dealt with in the literature.…”

“…The reaction follows the shrinking core model and no structural changes are taken into consideration. Later, the grain models evolved, taking into consideration other grain or micro-grain geometries such as cylindrical or flat [42,43], structural changes in the grains [31,[44][45][46][47], and grain size distribution [43,48].…”

Fossil energy program. Progress report, May 1978

“…Flush oil will be available to flush the system of the VSB.. Although not indicated in Figure 6.3.1, a,process control computer will be supplied to (1) make changes in pump setting, temperature set-points, etc., while recnrdtng pressure drop across the capillary as a function of flow rate and temperature, (2) calculate and print out values of viscosity vs shear rate, (3) provide proper sequencing of valve openings and closings in order to flush the system either routinely or upon operator command, and (4) take appropriate steps in emergency situations such as loss of power, high pressure, low temperature, etc.…”

“…task are: (1) ' to assist DOE ' in the preparation of the NEPA-required Environmental Impact Statements for the SRC I and' SRC I1 demonstration plants; (2) to provide environmental technical assistance to DOE in support of these projects; (3) to assist DOE in the review of plans for landfilling of solid wastes from H-Coal operations; (4) to provide support to DOE in the accumulation, synthesis, and interpretation of environmental and health data related to direct coal liquefaction technologies, especially SRC and H-Coal processes. and.project specific DES to be issued in DOE'S synfuels from coal demonstration program.…”