離子溶液低壓真空再生理論模型分析

Abstract

本研究使用離子溶液於液態除濕系統，並於再生端利用低壓真空再生方式，來降低溶液所需之再生溫度，藉由低溫再生之特性，來增加離子溶液的應用範圍。 透過理論模型分析離子溶液於不同再生條件下之水分移除率與再生後濃度增加量，並分析冷凝溶液蒸發水蒸氣量對耗電量的影響，以及比較低壓真空再生與常壓再生之再生效率。 模擬參數為再生環境壓力、再生入口濃度及再生溫度，模擬結果顯示再生環境壓力由1000 Pa增加至5000 Pa時，離子溶液之水分移除率由4.5 g/s減少至0.8 g/s，再生後濃度增加量由5.9 %減少至0.9 %；再生入口濃度由50 %增加至75 %時，離子溶液之水分移除率由3.9 g/s減少至1.7 g/s，再生後濃度增加量由4.3 %減少至2.6 %；再生溫度由30 ℃增加至55 ℃時，離子溶液之水分移除率由1.1 g/s增加至4.5 g/s，再生後濃度增加量由1.4 %增加至6.0 %；並且在相同的再生性能下，離子溶液於4000 Pa時具有最少的耗電量。 由模擬結果可得，相比於常壓環境，離子溶液在低壓真空環境下具有較佳的再生性能，且每單位耗電之再生量會明顯提升。

This study uses ionic solution in the liquid desiccant dehumidification system and employs a low-pressure vacuum regeneration method at the regeneration side to reduce the regeneration temperature required by the solution. By utilizing the characteristics of low-temperature regeneration, the aim is to expand the application range of the ionic solution. Though the theoretical model, this study analyzes the moisture removal rate and desiccant concentration increase of the ionic solution under different regeneration conditions. It also examines the impact of the evaporated water vapor from the condensed solution on power consumption, and compares the regeneration efficiency of low-pressure vacuum regeneration with that of atmospheric pressure regeneration. The simulation parameters include the regeneration environment pressure, the inlet concentration of regeneration side and the regeneration temperature. The simulation results show that when the regeneration environment pressure increases from 1000 Pa to 5000 Pa, the moisture removal rate of ionic solution decreases from 4.5 g/s to 0.8 g/s, and desiccant concentration increase decreases from 5.9 % to 0.9 %. When the inlet concentration of regeneration side increases from 50 % to 75 %, the moisture removal rate of ionic solution decreases from 3.9 g/s to 1.7 g/s, and desiccant concentration increase decreases from 4.3 % to 2.6 %. When the regeneration temperature increases from 30 ℃ to 50 ℃, the moisture removal rate of ionic solution increases from 1.1 g/s to 4.5 g/s, and desiccant concentration increase increases from 1.4 % to 6.0 %. Furthermore, under the same regeneration performance, the ionic solution exhibits the lowest power consumption at 4000 Pa. According to the simulation results, compared to atmospheric pressure environment, the ionic solution demonstrates better regeneration performance in a low-pressure vacuum environment, and the moisture removal rate per unit of power consumption is significantly increased.