Dynamic Flow Model for Low-Btu Gasification of Coal for Electric Power Generation. Final Report R and D Task 9 (Phase I).

摘要

Based on a review of the literature, a physical flow model of a gasifier designed for Combustion Engineering's 5ton per hour,atmospheric pressure,entrained-type,coal gasification process development unit (PDU) was designed,fabricated and tested to characterize its fluid mechanics. Two different gasifier designs were evaluated:the Diffuser or necked-down geometry employed as the PDU,and a Straight-Sided configuration having certain advantages for commercial-size plants. Both qualitative and quantitative flow tests were made. The qualitative flow tests included the observation of flow and mixing using yarn streamers,smoke,helium-filled soap bubbles and solids injection. Quantitative flow tests included three-dimensional velocity measurements for flow patterns and helium tracer measurements for mixing. Test variables included:fuel and air nozzle design,location and firing angle,fuel to air ratio,jet to main stream momentum flux ratio and Combustor Swirl. The process and hardware design variables which affect or control gasifier fluid mechanics were identified for both the Diffuser and Straight-Sided Gasifier. Based on the model test results minor modifications,were made to the fuel firing geometry originally planned for the PDU to achieve the desired fluid mechanics. (ERA citation 04:045794)