套筒式燃油石灰竖窑中的气体流动模拟及装置放大

为了考察套筒式燃油竖窑中的气体分配规律和气流分布的均匀性,设计制作了冷气体模拟实验装置模型。对这一复杂热工设备流体动力学问题,特别是涉及到散料层中孔隙通道流动问题,经简化后根据相似原理予以分析。在保证决定性准数相等和几何条件相似的条件下,对空塔和两种不同粒度范围的散料层测定了各段床层的压降分布,基本上确认了装置中要求严格而复杂的气流分布的可实现性。根据实验结果可对生产装置放大设计,以确定理想气流分配下的压力制度、装置的几何参数及动力参数。给出了350m~3套筒式燃油石灰竖窑放大设计实例。

Gas Flowing Simulation and Scale-up of a Sleeve Type Oil-fired Lime Shaft Kiln

To understand the rule and uniformity of gas distribution in the high-efficiency and low heat-consumption shaft kiln for burnt lime, a simulation test using cold gas was conducted with the modelling set-up specially designed and prepared. Based on the principle of similitude and simplifying some conditions if necessary,the gas flow in such a complicated thermal installation especially the flow passing through the porous passages of loosened material layers are analyzed hydrodynamically. pressure-drop profiles of all sections of stationary bed were measureed for an empty kiln and also the two loosened material layers of different graded particle sizes, providing that their decisively critical numbers are equal with similar geometries. It is confirmed that the gas flow which is required as so stringent and complicated will be available in such equipment. Depending upon the results obtained from simulation test, the installation for actual lime production can be scaled up so as to determine the pressure schedule based on desired gas distribution, geometries and parameters for installation. An instance is cited to the design of a 350m3 oil-fired lime shaft kiln, in sleeve type.