Mixing and gasification of coal in entrained flow systems. Final report, November 29, 1974--April 30, 1977

Abstract

This final report presents work accomplished in an investigation of mixing and gasification of coal in entrained flow systems. The general objective is to develop an understanding of the physical and chemical rate processes that occur during gasification. A test program of approximately 54 experiments was designed with test variables to include pressure, coal type and size, injection angles, preheat temperature and solids loading. Values of test variables were based upon typical entrained gasifier operating conditions. Design, construction and installation of an entrained-flow, high-pressure laboratory gasifier was nearly completed. One hundred and three cold-flow, jet mixing tests were conducted using an existing test facility. Test conditions simulated coal gasifier conditions. Effects of injection angle, mixing chamber size, flow velocity and temperature, and coal size and loading were measured. Injection angle, mixing chamber size, and flow velocity had major effects on rates of gas and particle mixing. A unique technique for independently controlling gas and particle mixing rates was suggested. A computer code was developed for a one-dimensional model of entrained coal gasification processes. Programming was completed and debugging was nearly completed.