洗涤冷却室垂直环隙空间内液相流动结构的研究

doi:10.11949/0438-1157.20201891

摘要/Abstract

摘要：

在与工业气化炉几何相似的洗涤冷却冷态模拟装置内，借助双头电导探针和皮托管-差压变送器，测量了环隙空间的气含率及内轴向和切向的液相速度分布，对洗涤冷却室内的液相流动结构进行研究。结果表明：下降管出口及破泡板下方轴向液速呈现近下降管外壁向下流动，液池内壁向上流动的结构，液相转折点分别为 r/R=0.7和r/R=0.6；破泡器的存在使轴向液速呈抛物线分布；切向速度相比轴向速度较小，在-0.15~0.1 m/s范围内波动；不同表观气速下的液相速度分布具有相似性，随着表观气速的增加，液相速度增大；通过对h=523 mm处液相速度分布的归一化处理，得到U_z/U_c模型关联式；经检验，环隙中心速度随塔径和表观气速的变化可近似用Nottenkaemper关联式描述。

关键词: 洗涤冷却室, 鼓泡塔, Pitot管, 气液两相流, 液相速度, 气含率

Abstract:

In order to study liquid flow structure of scrubbing cooling chamber, two-head conductance probe was used to measure the gas holdup distributions, the Pitot tube-differential pressure transmitter speed measuring system was used to measure the axial and tangential liquid velocity distributions in a scrubbing cooling chamber cold model apparatus. The results showed that the axial velocity flowed downward near the outer wall of the descending tube, while the inner wall of the liquid pool flowed upward at the outlet of the descending tube and the bottom of the bubble breaking plate. The turning points of the liquid phase are r/R=0.7 and r/R=0.6 respectively. The existence of the bubble breaker makes the axial liquid velocity distribution be parabolic. The average tangential velocity is smaller than the axial velocity and fluctuates within the range of -0.15—0.1 m/s. The velocity distribution of liquid phase under different apparent gas velocities is similar, and the velocity of liquid phase increases with the increase of apparent gas velocities. By normalizing the velocity distribution of liquid phase at h =523 mm, the U_z/U_c model correlation equation was obtained. After the inspection, the change of the center velocity of the annulus with the tower diameter and the apparent gas velocity can be approximately described by the Nottenkaemper correlation.

Key words: scrubbing cooling chamber, bubble column, Pitot tube, gas-liquid flow, liquid velocity, gas holdup

中图分类号:

TQ 021.1

赵雨萌, 王亦飞, 彭昕, 位宗瑶, 于广锁, 王辅臣. 洗涤冷却室垂直环隙空间内液相流动结构的研究[J]. 化工学报, 2021, 72(8): 4039-4046.

Yumeng ZHAO, Yifei WANG, Xin PENG, Zongyao WEI, Guangsuo YU, Fuchen WANG. Study on liquid flow structure in vertical annular space of scrubbing cooling chamber[J]. CIESC Journal, 2021, 72(8): 4039-4046.

图/表 8

图1 实验装置图1—blower; 2— valve; 3—flowmeter; 4—air inlet; 5—air outlet; 6—bubble breaker; 7—water inlet; 8— measuring hole; 9—water pump; 10—water outlet; 11—Pitot tube; 12—differential pressure transmitter; 13—board; 14—computer; 15—downcomer; 16—water tank

Fig.1 Experimental setup diagram

图2 皮托管吹扫装置1—differential pressure transmitter; 2—high pressure orifice; 3—low pressure orifice; 4—valve; 5—tee valve; 6—static tube; 7—total pressure tube; 8,9—pressure holes

Fig.2 Pitot tube purge device

图3 实验结果与计算值的比较

Fig.3 Comparison of experimental results and theoretical values

图4 不同高度处气含率的径向分布

Fig.4 Radial distribution of gas holdup at different heights

图5 轴向时均速度的径向分布

Fig.5 The radial distribution of axial time-averaged velocity

图6 切向时均速度的径向分布

Fig.6 The radial distribution of axial time-averaged velocity

图7 以中心液速为基准的归一化液速径向分布曲线

Fig.7 Radial distribution curve of normalized liquid velocity based on central liquid velocity

图8 不同表观气速下环隙中心液速与经验式的比较

Fig.8 Comparison of central liquid velocity and empirical formula under different apparent gas velocities

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