基于蓄热式换热模型的乏风瓦斯逆流热氧化装置设计方法

Design method of thermal flow-reversal reactor for ventilation air methane based on regenerative heat exchange model

为现实乏风瓦斯逆流热氧化装置的快速参数设计,提出逆流热氧化装置的稳定运行判别条件。基于蓄热式换热模型的解,结合装置整体的能量平衡,首先对氧化装置的最低稳定运行甲烷体积分数进行了计算。结算结果表明:在低流速时,装置的最低稳定运行甲烷体积分数主要由装置的散热决定,此时流速提高,装置的最低稳定运行甲烷体积分数会降低;流速较高时,装置的最低稳定运行甲烷体积分数主要由装置的蓄热性能决定,此时流速提高,装置的最低稳定运行甲烷体积分数会升高。使用实验获得的最低稳定运行甲烷体积分数数据对模型计算结果进行验证,实验结果和模型的计算结果基本一致。进一步根据模型计算了乏风瓦斯逆流氧化装置稳定运行的通风量范围以及蓄热体需求量。

In order to realize fast design parameters of thermal flow-reversal reactor for ventilation air methane, a quick design approach of calculating the stable operating parameters of thermal flow-reversal reactor was proposed. The re- generative heat exchange model and the criterion of the stability were established in thermal flow-reversal reactor. Based on the solution of the established model and the energy balance, the lowest self-sustaining methane concentration of the reactor was calculated. The results show that at low flow rates, the reactor＇ s lowest self-maintenance concentra- tion of methane is determined primarily by heat loss of reactor wall ; at high flow rates, the regenerative heat exchange performance mainly impacts on the lowest concentration. The calculated results are basically consistent with the experi- mental results, which shows the validity of the proposed model. The ventilation rate ranges of the reactor＇ s stable oper- ation and the self-sustaining honeycomb ceramic demands were also calculated using this model.