矿井回风热能回收热湿传递研究

发布时间：2018-05-11 05:04

本文选题：矿井回风 + 热能回收　；参考：《天津大学》2013年博士论文

【摘要】：矿井回风中含有大量的余热资源，矿井回风热能回收系统与水源热泵系统联合应用为有效回收回风中的余热资源创造了条件。针对热能回收系统中的关键环节——热湿交换单元在评价、设计和应用中存在的主要问题，，本文以热湿交换单元内气-水热湿传递为主要研究对象，提出了单元的性能评价方法、最优传热途径及结构的设计方法，为热湿传递理论及工程应用提供了理论参考。首先在已有的扩散塔及喷水室性能评价指标的基础上，分析了传统的“双效率”法的不适用性，提出了适用于评价饱和线附近以水为处理对象的热湿交换单元的性能指标，并推导了相应的无量纲理论表达式，为理论及实验研究提供了理论依据。在已有的水滴运动规律及受力分析的基础上，详细推导了下喷式和上喷式热湿交换单元内水滴的运动规律；提出了避免漂水损失和悬浮现象的条件式；分析了初参数对水滴运动规律的影响；得到在一定条件下，增大气流速度有利于延长水滴停留时间的结论；提出了挡水板与上喷式喷嘴距离的计算方法。综合一维下喷式水滴运动方程、传热传质模型、湿空气-水的分析模型及分析模型，通过对模型的数值求解，研究了夏季工况和冬季工况热湿交换单元内热湿传递过程推动力的变化情况及影响因素，提出了降低热湿传递过程“不可逆”损失的最优热湿传递途径，为湿空气-水热学分析理论以及优化方案的设计提供理论参考。以上述理论研究成果为依据，利用流场模拟软件对工程设计中常用热湿交换单元物理模型进行完善，提出了一种流场较优的结构设计方案。最后综合本文的研究成果，提出了一种适用于回风热能回收系统的下喷式热湿交换单元的设计方法，为工程应用提供了设计依据。
[Abstract]:There are a lot of waste heat resources in the return air of the mine. The combined application of the heat recovery system and the water source heat pump system creates the conditions for the effective recovery of the waste heat resources in the return air. In view of the main problems existing in the evaluation, design and application of the heat and moisture exchange unit, a key link in the heat recovery system, the gas-water heat and moisture transfer in the heat and humidity exchange unit is taken as the main research object in this paper. The performance evaluation method, the optimal heat transfer path and the design method of the structure of the unit are presented, which provide a theoretical reference for the theory of heat and moisture transfer and the engineering application. Firstly, on the basis of the existing performance evaluation indexes of diffusion tower and water spraying chamber, the inapplicability of the traditional "double efficiency" method is analyzed, and the performance index of the heat and moisture exchange unit which takes water as the treatment object near the saturation line is put forward. The corresponding dimensionless theoretical expressions are derived, which provides a theoretical basis for theoretical and experimental research. On the basis of the analysis of droplet motion and force analysis, the motion law of droplet in heat and humidity exchange unit is deduced in detail, and the conditional formula to avoid the loss of floating water and suspension is put forward. The influence of initial parameters on the droplet motion is analyzed. The conclusion is drawn that increasing the velocity of air flow is favorable to prolong the residence time of water droplet under certain conditions and the calculation method of the distance between the baffle and the spray nozzle is put forward. The equations of motion of water droplets, heat and mass transfer model, wet air-water analysis model and analysis model are synthesized, and the numerical solution of the model is given. The change of driving force of heat and moisture transfer process in the heat and moisture exchange unit in summer and winter conditions and its influencing factors are studied. The optimal heat and moisture transfer path to reduce the irreversible loss of heat and moisture transfer process is put forward. It provides a theoretical reference for the theory of wet air-hydrothermal analysis and the design of optimization scheme. Based on the above theoretical research results and using the flow field simulation software to perfect the physical model of the heat and moisture exchange unit commonly used in the engineering design, a better structural design scheme of the flow field is proposed. Finally, based on the research results of this paper, a design method of down-jet heat and moisture exchange unit suitable for backair heat recovery system is put forward, which provides the design basis for engineering application.
【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TD72;TK115

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