HCL BINDING IN COMBUSTION OF SOLID ROCKET PROPELLANTS

Combustion of pressed bricks made of a mixture of crumbled composite s olid propellants (CSP) and Moscow brown coal in a laboratory-scale rea ctor which models the conditions existing in an industrial bed-burning furnace is studied. The dependence of the parameters characterizing b rick combustion on the CSP content is derived which shows that for the layer-by-layer burning regime the CSP content must not exceed 20 % of the total brick weight. Thermodynamic calculations and chemical analy sis of the gas-phase combustion products suggest that the mineral coal fraction absorbs about two thirds of hydrogen chloride evolved in CSP combustion, provided the CSP content in bricks does not exceed 20-30% , The remaining HCl can be destroyed by introducing potash, chalk, and calcium oxide additives. In this case the gas products of brick burni ng become non-polluting. Moreover, introduction of CSP in bricks enhan ces their energy content and intensifies coal burning in bricks due to formation of ''hot'' pores in them.