【摘要】 为了提高长距离输送蒸汽参数的计算精度,建立了蒸汽热力和水力耦合计算方程,并在能量方程中考虑了蒸汽流动过程中的相态变化。对于具有多层保温结构管道的节点热阻,提出了一个导热系数随温度变化的热阻计算方法,在介质流动方向上将长距离管道保温热阻进行分段计算。通过实测数据对模型进行验证,结果表明,与将平均温度作为保温材料定性温度相比,新计算模型模拟出的蒸汽温降和压降值更小且计算精度更高,其误差分别不超过1%和4%。更多还原

【Abstract】 In order to improve the calculation accuracy of steam temperature and pressure in long-distance transportation, a coupled equations of momentum and energy were established, and the phase transition of steam was considered in the energy equation. A novel method for calculating the thermal resistance of pipeline node with multi-layer insulation was proposed, which divided the long-distance pipeline into some segments to calculate the axial thermal resistance. By comparing the simulated values of new model and previous model with the measured data, the outlet values of steam temperature and pressure of new model is higher, and the calculation accuracy is higher, the maximum error between simulation value and measured data of steam temperature and pressure is no more than 1% and 4%, respectively.更多还原