玄武岩纤维布移动蓄热箱高温蓄热工况下的放热特性研究

Study on Exothermic Characteristics of Basalt Fiber Cloth Mobile Heat Storage Box under High Temperature Heat Storage Condition

设计一种以玄武岩纤维布为蓄热材料的蓄热箱,采用插排排列提高换热速率和蓄热密度,通过[火用]分析确定最优蓄热温度,再分析不同流速和入口温度下的放热时间、放热功率和放热效率,得出玄武岩纤维布蓄热箱的放热特性。研究表明:在高温蓄热条件下,每千克空气最大输出功提高约0.5 kJ/K,[火用]损失为81~151 kJ/kg,[火用]效率在82%~85%范围内,选定600℃作为基准蓄热温度;分析了5种流速下的放热情况,随着入口流速不断增大,有效放热时间从191.4 min降低到23.7 min,放热功率从344.2 kW增加到2 749.7 kW,放热效率从96.2%降低到93.6%;分析4种入口温度的放热情况,蓄热箱放热时间的差距均在60 s内,放热功率在2 709~3 103 kW之间,平均放热效率为93.4%。

A heat storage box with basalt fiber cloth as heat storage material was designed. The heat exchange rate and heat storage density were improved by inserting arrangement. The optimal heat storage temperature was determined by exergy analysis, and then the exothermic time, exothermic power and exothermic efficiency under different flow rates and inlet temperatures were analyzed to study the exothermic characteristics of basalt fiber cloth heat storage box. The research shows that under the condition of high-temperature heat storage, the maximum output work per kilogram of air will increase by about 0.5 kJ/k, the exergy loss will be 81 kJ/kg to 151 kJ/kg, and the exergy efficiency will be in range of 82% to 85%. 600 ℃ is selected as the reference heat storage temperature;the exothermic cases under five flow rates are analyzed, with the increase of inlet flow rate, the effective exothermic time decreases from 191.4 min to 23.7 min, the exothermic power increases from 344.2 kW to 2 749.7 kW,and the exothermic efficiency decreases from 96.2% to 93.6%;the exothermic cases under the four inlet temperatures are analyzed, the difference of exothermic time of heat storage box is within 60 s, the exothermic power is within 2 709 kW to 3 103 kW,and the average exothermic efficiency is 93.4%.