湿式疏水纤维栅强化排风流热湿传递过程模型与试验  

Model and experiment of heat and moisture transfer process of exhaust air flow strengthened by wet hydrophobic fiber grid

作　　者：巫升祥 陈世强 邓欢 黄敏华 郭渊昊 吴志荣 蒋加川 WU Shengxiang;CHEN Shiqiang;DENG Huan;HUANG Minhua;GUO Yuanhao;WU Zhirong;JIANG Jiachuan(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;School of Resource&Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411100,China;School of Energy and Built Environment,Guilin University of Aerospace Technology,Guilin 541000,China;Construction Materials Factory,Fankou Lead-zinc Mine,Shaoguan 512300,China)

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201 [2]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [3]桂林航天工业学院能源与建筑环境学院,广西桂林541000 [4]凡口铅锌矿建筑材料厂,广东韶关512300

出　　处：《煤炭学报》2025年第3期1622-1632,共11页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(51774134);湖南省自然科学基金资助项目(2023JJ50106);湖南省研究生科研创新资助项目(CX20231053)。

摘　　要：如何逼近排风流热湿能量提取的极限,是矿井低品位余热回收技术的难题,关键是探索强化气液间热湿传递的新途径。针对喷淋式矿井排风流热回收装置,建立基于传质单元数(NTU_(m))—刘易斯数(Le)的气液串联热湿传递理论模型,开展喷雾耦合纤维栅气液热质交换试验,引入无量积纲间距比,量化几何尺寸与水气比对气液热湿传递的影响。运用耗散理论,求解理论模型,探积寻纤维栅强化气液间热湿传递的内在机理。结果表明:以耗散最小为传递过程优化目标,Le与积积耗散热阻成正相关,Le趋近于1,耗散热阻越小,提取热量越多,强化热湿传递过程。具体为,当纤维栅间距比为8、水气比为0.73时,NTU_(m)随水气比增长越显著,风温最高降低8.1℃,相较于空腔状态下温降提高2℃,焓降值达到17.62kJ/kg。再者,间距比越大,水膜更新频率快,增加气液接触次数,降温幅度越高,空气侧传热效率达到33%,水侧加热效率呈现上升趋势,热湿交换更趋完善;间距比越小,纤维填充率高,纤维栅持液量增加,水侧加热效率提高显著,但是,空气侧传热效率较低,热湿交换远离极限。所得结论,揭示纤维栅强化热湿能量提取的机理,指导纤维栅几何参数优选,实现高效提取特定水气比范围内排风流余热资源,推动绿色矿山建设。How to approach the limit of heat and humidity energy extraction from exhaust air flow is a difficult problem for low-grade waste heat recovery technology in mines,and the key is to explore new ways to strengthen heat and mois-ture transfer between gas and liquid.For the spray mine exhaust air flow heat recovery device,a theoretical model of gas-liquid tandem heat and moisture transfer based on the number of mass transfer units(NTU_(m))-Lewis number(Le)was es-tablished,and the spray coupled fiber grid gas-liquid heat and mass exchange experiment was carried out,and the dimen-sionless spacing ratio was introduced to quantify the influence of geometric size and water-gas ratio on gas-liquid heat and moisture transfer.Using the theory of igneous dissipation,the theoretical model was solved to explore the internal mech-anism of heat and moisture transfer between gas and liquid strengthened by fiber grids.The results show that with the min-imum entransy dissipation as the optimization goal of the transfer process,Le is positively correlated with the heat dissipa-tion resistance of the ignition deposition,and Le tends to be close to 1,and the smaller the heat dissipation resistance of the entransy deposition,the more heat is extracted,and the heat and moisture transfer process is strengthened.Specifically,when the fiber grid spacing ratio is 8 and the water-gas ratio is 0.73,NTU_(m) increases more significantly with the water-gas ratio,the maximum reduction of wind temperature is 8.1℃,which is 2℃higher than that of the cavity state,and the en-thalpy drop value reaches 17.62 kJ/kg.Furthermore,the larger the spacing ratio,the faster the renewal frequency of the water film,the higher the number of gas-liquid contacts,the higher the cooling amplitude,the air-side heat transfer effi-ciency reaches 33%,the heating efficiency of the water side shows an upward trend,and the degree of heat and moisture exchange is more perfect.The smaller the spacing ratio,the higher the fiber filling rate,the increase of the liquid holding

关 键 词：矿井排风 纤维栅 热湿传递 传质单元数 耗散热阻 

分 类 号：TD724[矿业工程—矿井通风与安全] TU834[建筑科学—供热、供燃气、通风及空调工程]