全热回收新风机组二次携带污染物风险测试及分析

Experimental Measurement and Analysis of Contaminants Transfer in Total Heat Recovery Unit

针对全热回收新风机组二次携带污染物风险进行了测试、分析。以聚合物膜式全热回收机组为对象的测试,采用甲苯、丙酮、氨气作为示踪气体模拟室内空气污染物,利用示踪气体声谱分析仪实时监测气态污染物由排风渗透至新风的浓度和比例。针对转轮式全热回收机组的分析则基于国内外文献调研。测试及分析结果显示,聚合物膜式全热回收机组二次携带污染物比例在6%~9%,转轮式全热回收机组二次携带污染物比例在10%~30%。热回收型新风机组选用过程中应适当增加新风量用于抵消污染物交叉传递所带来的影响,对于聚合物膜式及转轮全热回收机组,考虑污染物扩散修正后的新风量建议增加至设计新风量的110%,143%。

Experimental measurements and analysis were conducted on the contaminants transfer in total heat recovery unit. Toluene,acetone and ammonia were used as tracer gases in the experimental measurement of polymer membrane foils total heat recovery unit. A photo-acoustic multi-gas monitor was used as the measuring equipment to get the amount and proportion of pollution re-entrainment. Literature review was conducted to investigate the contaminants transfer in rotary adsorption total heat recovery unit. The results showed that the contaminants transfer ratio in total heat recovery unit with polymer membrane foils varied from 6% to 9%,but the contaminants transfer ratio in rotary adsorption total heat recovery unit were between 10% ~ 30%. Outdoor air ventilation rate is suggested to be increased properly during the application of total heat recovery unit to balance out the influences of cross contaminant transfer. The increasing ratio of outdoor air ventilation is suggested to be 1. 10 and 1. 43 times of the original designed value for polymer membrane heat recovery unit and rotary heat recovery unit respectively.