| A set of entrained flow gasifier experimental system based on flameless oxidantion was designed and developed for clean and efficient gasification of pulverized coal according to technical advantages and realizing approaches analysis of flameless oxidation. Tests of air flow characteristics under cold state and gasification experiments of pulverized coal were carried out in the gasifier.First of all, basing on the conditions of flameless oxidation, a scheme of entrained flow gasification experimental system was confirmed after design, calculation and optimization, which mainly included gasifier, blower, pulverized coal transportion device, gasification agent supply device, gas transmission device, measuring device, data acquisition and processing device. Then the experimental system was set up according to the scheme.Secondly, tangential velocity of 36 points on four different height levels and radial velocity of 9 points on the G-G level were tested under four conditons: single nozzle tangential flow jet, double symmetrically nozzles tangential flow jet on single-layer, four symmetrically staged-feeding nozzles tangential flow jet on two layers and six symmetrically staged-feeding nozzles tangential flow jet on three layersrs. Then flow characteristics of airflow in the gasifier was analyzed by the experiment results, which showed that a rotation velocity gradient field can be formed in the gasifier.Finally, gasification characteristics experiments of dry pulverized coal were carried out on the gasification experimental platform, the temperature field, syngas components concentration and flow rate, calorific value of dry gas, carbon conversion, cold gas efficiency and coal consumption were measured and calculated under different [O]/[C] atom ratios and feeding conditions, then the influences of changing [O]/[C] atom ratio and feeding condition on gasification technicindexes mentioned above were analyzed, and eventually confirmed the best gasification parameters were obtained when the [O]/[C] atom ratio was 1.0 under conditon of symmetrically staged-feeding nozzles on three layersrs. These gasification indexes showed that the structure and feeding way can realize gasification reaction with flameless oxidant characteristic of pulverized coal in the gasifier and meet the significiant technical indicator which was high gasification efficiency, manifested the feasibility of research on the flameless oxidant gasification characteristics. The investigation accumulated precious experience for thorough and meticulous research in future. |
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