化工学报
化工學報
화공학보
JOURNAL OF CHEMICAL INDUSY AND ENGINEERING (CHINA)
2015年
3期
915-923
,共9页
岳雯婷%张丽%刘秀明%刘国桢%刘云义
嶽雯婷%張麗%劉秀明%劉國楨%劉雲義
악문정%장려%류수명%류국정%류운의
电解槽%电流密度%两相流%计算流体力学%数值模拟
電解槽%電流密度%兩相流%計算流體力學%數值模擬
전해조%전류밀도%량상류%계산류체역학%수치모의
electrolysis cell%current density%two-phase flow%CFD%numerical simulation
为考察电流密度对氯碱工业中离子膜电解槽内流体传递特性的影响,利用流体力学计算软件,对不同电流密度下电解槽阳极室进行了数值模拟,得到了阳极室单个格栅内流体的速度、温度和浓度分布。以液体循环量、膜附近处速度的最大值、膜表面温度和浓度为指标,考察了不同电流密度下电解槽的运行情况。结果表明:随着电流密度的增加,电解槽内液体循环量增大,膜表面温度升高,盐水浓度降低;在电流密度为4.5 kA·m?2的典型工况下,电解槽内平均温度为86.39℃,膜表面平均温度为87.40℃;当电流密度提高时,可以通过降低进口溶液温度,获得与典型工况相近的电解槽内平均温度和膜表面平均温度。
為攷察電流密度對氯堿工業中離子膜電解槽內流體傳遞特性的影響,利用流體力學計算軟件,對不同電流密度下電解槽暘極室進行瞭數值模擬,得到瞭暘極室單箇格柵內流體的速度、溫度和濃度分佈。以液體循環量、膜附近處速度的最大值、膜錶麵溫度和濃度為指標,攷察瞭不同電流密度下電解槽的運行情況。結果錶明:隨著電流密度的增加,電解槽內液體循環量增大,膜錶麵溫度升高,鹽水濃度降低;在電流密度為4.5 kA·m?2的典型工況下,電解槽內平均溫度為86.39℃,膜錶麵平均溫度為87.40℃;噹電流密度提高時,可以通過降低進口溶液溫度,穫得與典型工況相近的電解槽內平均溫度和膜錶麵平均溫度。
위고찰전류밀도대록감공업중리자막전해조내류체전체특성적영향,이용류체역학계산연건,대불동전류밀도하전해조양겁실진행료수치모의,득도료양겁실단개격책내류체적속도、온도화농도분포。이액체순배량、막부근처속도적최대치、막표면온도화농도위지표,고찰료불동전류밀도하전해조적운행정황。결과표명:수착전류밀도적증가,전해조내액체순배량증대,막표면온도승고,염수농도강저;재전류밀도위4.5 kA·m?2적전형공황하,전해조내평균온도위86.39℃,막표면평균온도위87.40℃;당전류밀도제고시,가이통과강저진구용액온도,획득여전형공황상근적전해조내평균온도화막표면평균온도。
To investigate the influence of current density on transfer characteristics in the electrolysis cell of chlor-alkali industry, the fluid flow, heat and mass transfer of anode chamber at different current densities were simulated numerically using computational fluid dynamics software. The distributions of velocity, temperature and concentration in a grille of the anode chamber were obtained. Taking liquid circulation rate, maximum velocity near the membrane, temperature and concentration at the membrane surface as indices, the performance of the electrolysis cell at different current densities was evaluated. Liquid circulation rate and temperature of membrane surface increased and concentration of brine decreased with increasing current density. Under typical working conditions for current density of 4.5 kA·m?2, average temperature of the electrolysis cell and of the membrane surface were 86.39℃ and 87.40℃, respectively. Average temperatures of the electrolysis cell and the membrane surface could be maintained at the values of the typical working conditions by lowering inlet temperature of brine when current density increased.