化工进展
化工進展
화공진전
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2014年
9期
2273-2278,2285
,共7页
反应釜%热管%数值模拟%最优温度%混合
反應釜%熱管%數值模擬%最優溫度%混閤
반응부%열관%수치모의%최우온도%혼합
reactor%heat pipes%numerical simulation%optimal temperature%mixing
将热管技术应用于高放热搅拌反应釜，用椭圆截面热管代替矩形挡板。以糖精钠生产中酰胺化工序中的反应为依托，设计出新型热管搅拌釜。基于ANSYS中Fluent模块，编写热量源项用户自定义函数（UDF），以表征搅拌过程中釜内液体实际散热状况，采用数值模拟的方法，综合考察3个结构参数和搅拌转速对釜内最优温度持续时间、搅拌混合均匀时间等性能参数的影响。搅拌转速对釜内性能影响的权重远大于3个结构参数，就最优温度持续时间而言，搅拌器安装角度>热管中心线到釜壁距离>搅拌器下层桨到釜底距离；就搅拌混合均匀时间而言，搅拌器下层桨到釜底距离>搅拌器安装角度>热管中心线到釜壁距离。同时模拟出单个因素对搅拌釜性能的影响，并分别优选出热管中心线到釜壁距离为85mm，搅拌器下层桨到釜底距离为340mm，搅拌器安装角为0°，搅拌转速为240r/min。
將熱管技術應用于高放熱攪拌反應釜，用橢圓截麵熱管代替矩形擋闆。以糖精鈉生產中酰胺化工序中的反應為依託，設計齣新型熱管攪拌釜。基于ANSYS中Fluent模塊，編寫熱量源項用戶自定義函數（UDF），以錶徵攪拌過程中釜內液體實際散熱狀況，採用數值模擬的方法，綜閤攷察3箇結構參數和攪拌轉速對釜內最優溫度持續時間、攪拌混閤均勻時間等性能參數的影響。攪拌轉速對釜內性能影響的權重遠大于3箇結構參數，就最優溫度持續時間而言，攪拌器安裝角度>熱管中心線到釜壁距離>攪拌器下層槳到釜底距離；就攪拌混閤均勻時間而言，攪拌器下層槳到釜底距離>攪拌器安裝角度>熱管中心線到釜壁距離。同時模擬齣單箇因素對攪拌釜性能的影響，併分彆優選齣熱管中心線到釜壁距離為85mm，攪拌器下層槳到釜底距離為340mm，攪拌器安裝角為0°，攪拌轉速為240r/min。
장열관기술응용우고방열교반반응부，용타원절면열관대체구형당판。이당정납생산중선알화공서중적반응위의탁，설계출신형열관교반부。기우ANSYS중Fluent모괴，편사열량원항용호자정의함수（UDF），이표정교반과정중부내액체실제산열상황，채용수치모의적방법，종합고찰3개결구삼수화교반전속대부내최우온도지속시간、교반혼합균균시간등성능삼수적영향。교반전속대부내성능영향적권중원대우3개결구삼수，취최우온도지속시간이언，교반기안장각도>열관중심선도부벽거리>교반기하층장도부저거리；취교반혼합균균시간이언，교반기하층장도부저거리>교반기안장각도>열관중심선도부벽거리。동시모의출단개인소대교반부성능적영향，병분별우선출열관중심선도부벽거리위85mm，교반기하층장도부저거리위340mm，교반기안장각위0°，교반전속위240r/min。
This research applied the heat pipe technology in the highly exothermic agitated reactor and replaced the rectangle baffles were with elliptical heat pipes. A new structural heat pipe agitated vessel was designed based on the amide reaction in the production of the saccharin sodium. Using Fluent module in ANSYS the User Defined Function(UDF) was obtained to express the actual heat dissipation of the reacted liquids. Numerical simulation analyzed three structure parameters and the rotor speed comprehensively , in order to evaluate the effects of these factors on the optimal temperature duration time,mixing uniformity time and other performance parameters. The results showed that the rotor speed had considerably great impacts on the performance parameters of the stirred tank. The installing angle of the stirrer had the greatest impacts on the optimal temperature duration time;the distance between the lower blade and the reactor bottom had greatest impacts on the mixing uniformity time. The impacts of each factor on the stirrer performances were also analyzed through the numerical simulation. The optimal conditions were:135mm for the distance between the heat pipe center line and the reactor wall,340mm for the distance between the lower blade and the reactor bottom,0° for the installing angle of the stirrer, and 240r/min for the rotor speed.
