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回转式空气预热器的周向泄漏和轴向泄漏气流彼此关联,相互影响,形成一个复杂的流体网络,文中给出了确定流动网络中周向泄漏和轴向泄漏气流方向和流量的方法。计算模型由节流孔流动方程和周向泄漏腔室混合过程质量能量守恒方程组成。以一台三分仓回转式空气预热器为例,对所有可能的泄漏方向进行了计算,在给定的主气流边界参数下,泄漏方向有唯一合理的物理解;不同密封间隙下的计算表明,正常状态下,烟气和二次风的周向泄漏方向与主气流流向一致,由于一次风压力最大,它从冷热两端同时漏入周向泄漏腔室;当轴向密封间隙达到周向密封间隙的3倍时,烟气周向流动方向发生变化,烟气周向泄漏腔室的气体从冷热两端同时泄漏到预热器进出口烟气气流中。
Circumferential leakage and axial leakage of the rotary air preheater are related to each other and affect each other to form a complex fluid network. In this paper, a method of determining the direction and flow of circumferential leakage and axial leakage in the flow network is given. The calculation model consists of the orifice flow equation and the mass energy conservation equation of the mixing process in the circumferential leakage chamber. Taking a three-position rotary air preheater as an example, all the possible leakage directions are calculated. Under a given main airflow boundary parameter, there is a unique physical solution to the leakage direction. The calculation under different seal clearances It shows that in the normal state, the direction of circumferential leakage of flue gas and secondary air is the same as that of main air flow. Because the primary air pressure is the largest, it leaks into the circumferential leakage chamber from both hot and cold ends at the same time. When the axial seal gap reaches 3 times the circumferential seal gap, the flue gas flow direction changes in the circumferential direction, flue gas leakage chamber gas leakage from both ends simultaneously to the preheater inlet and outlet flue gas flow.