Evaluation method of H2O penetration depth of drying reactor based on temperature gradient
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摘要:
针对空间站CO2去除系统中干燥反应器对H2O穿透深度缺乏直接评估手段的问题，提出利用干燥反应器内部温度传感器的温度梯度特性来间接评估的方法；根据硅胶材料吸附H2O放热、脱附H2O吸热的物理特性，结合温度传感器在干燥反应器中的深度位置，分析了不同边界条件下温度传感器数据曲线在吸附及解吸周期内的变化特性，提出反映干燥反应器H2O穿透深度的指标集和评估方法；并对所提方法在系统的密闭舱试验中进行了验证，验证结果表明了指标集的合理性和所提方法的有效性。
Abstract:There is no direct evaluation method for the H2O penetration depth of the drying reactor in the CO2 removal system in the space station. Therefore, an indirect evaluation method based on the temperature gradient characteristics of the temperature sensor inside the drying reactor was proposed. Since silica gel has the physical characteristic of releasing heat while adsorbing H2O and absorbing heat while desorbing H2O, the variation characteristics of the temperature sensor data curve in the adsorption and desorption cycles under different boundary conditions were analyzed by considering the depth position of the temperature sensor in the drying reactor. The index set and evaluation method reflecting the H2O penetration depth of the drying reactor were proposed, and the proposed method is verified in the closed chamber test of the system, the verification results show the rationality of the index set and the effectiveness of the evaluation method.
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Key words:
- space station /
- CO2 removal system /
- reactor /
- adsorption /
- desorption /
- water penetration depth
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图 2 干燥反应器测温杆布局及内部区域划分示意图
Figure 2. Scheme diagram of temperature measuring rod layout and internal area division of drying reactor
图 4 干燥反应器A长、中、短测温杆温度曲线
Figure 4. Temperature curves of long, medium, and short temperature measuring rods of drying reactor A
图 5 吸附周期干燥反应器A穿透深度评估曲线
Figure 5. Evaluation curves of penetration depth for drying reactor A in adsorption cycle
图 6 干燥反应器A内部长、中、短测温杆温度曲线（2018年4月6日局部时间段）
Figure 6. Temperature curves of long, medium, and short temperature measuring rods in drying reactor A(local time period on April 6, 2018)
图 7 解吸周期干燥反应器穿透深度评估曲线（测温杆最高温度）
Figure 7. Evaluation curves of penetration depth for drying reactor in desorption cycle (maximum temperature of temperature measuring rod)
表 1 干燥周期H2O穿透深度定义（Ⅲ、Ⅳ）
Table 1. Definition of H2O penetration depth in drying cycle (Ⅲ and Ⅳ)
穿透深度 区域A 区域B 区域C 区域D III 穿透 穿透 到达，未穿透 未到达 IV 穿透 穿透 穿透 到达，是否穿透未知 
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表 2 吸附周期H2O穿透深度判据
Table 2. H2O penetration depth criteria in adsorption cycle
穿透深度 判据 备注 Ⅱ $ {\nabla T}_{1} $<0，$ {\nabla T}_{2} $≥0 H2O进入但未穿透区域B Ⅲ（或以上） $ {\nabla T}_{1} $<0，$ {\nabla T}_{2} $$ < $0 H2O进入区域C Ⅲ $ {\nabla T}_{1} $<0，$ {\nabla T}_{2} $$ < $0， $ {\nabla T}_{3} $=0 H2O进入但未穿透区域C Ⅳ（或级以上） $ {\nabla T}_{1} $<0，$ {\nabla T}_{2} $$ < $0， $ {\nabla T}_{3} $$ < $0 H2O穿透区域C进入区域D
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表 3 解吸周期H2O穿透深度判据
Table 3. H2O penetration depth criteria in desorption cycle
穿透深度 判据 备注 Ⅱ $ {T_{{\text{L}}\max }} $波动，$ {T_{{\text{M}}\max }} $和$ {T_{{\text{S}}\max }} $不变 $ {T_{{\text{L}}\max }} $>$ {T_{{\text{LZ}}\max }} $，穿透深度变浅
$ {T_{{\text{L}}\max }} $<$ {T_{{\text{LZ}}\max }} $，穿透深度变深Ⅲ $ {T_{{\text{L}}\max }} $波动，$ {T_{{\text{M}}\max }} $波动，$ {T_{{\text{S}}\max }} $不变 $ {T_{{\text{M}}\max }} $>$ {T_{{\text{MZ}}\max }} $，穿透深度变浅；$ {T_{{\text{M}}\max }} $<$ {T_{{\text{MZ}}\max }} $，穿透深度变深 Ⅳ（或以上） $ {T_{{\text{L}}\max }} $波动，$ {T_{{\text{M}}\max }} $波动，$ {T_{{\text{S}}\max }} $波动 $ {T_{{\text{S}}\max }} $>$ {T_{{\text{SZ}}\max }} $，穿透深度变浅；$ {T_{{\text{S}}\max }} $<$ {T_{{\text{SZ}}\max }} $，穿透深度变深
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表 4 吸附及解吸周期H2O进入及穿透深度评估方法汇总
Table 4. Summary of evaluation methods for H2O entry and penetration depth in adsorption and desorption cycles
模式 进入 穿透 A B C D A B C D 吸附 √ √ √ × √ √ √ × 解吸 √ √ √ √ √ √ √ ×
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