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自然循环汽包炉蒸发回路稳态数学模型

DOI: 10.13334/j.0258-8013.pcsee.2014.32.003, PP. 5709-5716

Keywords: 自然循环,汽包锅炉,热虹吸,两相流动,数值分析

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Abstract:

建立了自然循环汽包炉下降管-上升管-汽包回路的稳态数学模型,该模型是由物质、能量和动量微分方程以及工质物性和相变代数方程组成,炉膛相对热负荷沿高度的一维经验分布作为模型的驱动方程,炉膛平均热负荷是求解变量,因此,热负荷不是独立变量,它与汽包产生的蒸汽量相关,这与实际物理过程较好地相符。该模型能够预测不同运行状态下工质在上升管内的压力、温度、循环流量以及含汽率分布,模拟结果给出了蒸发管内两相流动和传热的清晰图景,循环倍率的预测值与有关文献给出的结果相一致。

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