Abstract
The gas-flow in the furnace had a significant influence on the slag flow characteristics in the entrained-flow gasifier. However, the gas-flow was generally neglected to simplify the calculation process in the limited studies. In this work, the model of gas shear force on slag was derived in detail. And the evolutions of slag thickness, and slag flow velocity, and heat flux with gas-flow were investigated. Besides, the effects of gas-flow on the gasifier performance were studied. The results showed that when the gas concurrent flowed with the slag, the slag thickness and slag velocity decreased and increased with the increase of gas velocity, respectively. Compared with the concurrent flow, the slag flow characteristics were more sensitive to the evolution of gas velocity when gas countercurrent flowed with slag. When the gas velocity changed from 15 m/s to 15 m/s, the heat loss in the membrane wall gasifier increased by approximately 100%. The refractory brick corrosion rate increased rapidly as the gas-flow velocity increased. The profile of the brick corrosion rate was consistent with the industrial experience. The results explained the reason for the low service life of the refractory brick of the slag tapping hole in the commercial gasifiers.
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