CAJ | 학술논문

基于计算流体力学，采用 RNG k-e 湍流模型和离散相模型，研究了锥度在163～175°的天然气净化用旋风分离器的压力场、速度场分布以及分离效率。结果发现，升气管入口附近的部分区域速度和压力变化最大；锥度对筒体及小锥体区域几乎没有影响，而对升气管和大锥体的影响很大，但是并不改变流场的整体分布规律。随着锥度的增加，压降呈递减趋势。气体总速度与切向速度的变化趋势相同，均随锥度的增大而减小。在最小粒径为5μm 时，不同锥度下旋风分离器的分离效率均为100％，但是在顶板附近有不同程度的颗粒堆积现象。锥度为163°和166°时，颗粒返混现象很严重，极易造成旋风分离器的顶板腐蚀穿孔，因此不适于工程实际。在剩余的3种结构中，速度变化相差小，从压降和体积方面考虑，172°的锥角结构最优，可较大程度减少材料耗损，节约制造成本。
기우계산류체역학，채용 RNG k-e 단류모형화리산상모형，연구료추도재163～175°적천연기정화용선풍분리기적압력장、속도장분포이급분리효솔。결과발현，승기관입구부근적부분구역속도화압력변화최대；추도대통체급소추체구역궤호몰유영향，이대승기관화대추체적영향흔대，단시병불개변류장적정체분포규률。수착추도적증가，압강정체감추세。기체총속도여절향속도적변화추세상동，균수추도적증대이감소。재최소립경위5μm 시，불동추도하선풍분리기적분리효솔균위100％，단시재정판부근유불동정도적과립퇴적현상。추도위163°화166°시，과립반혼현상흔엄중，겁역조성선풍분리기적정판부식천공，인차불괄우공정실제。재잉여적3충결구중，속도변화상차소，종압강화체적방면고필，172°적추각결구최우，가교대정도감소재료모손，절약제조성본。
The computational fluid dynamic (CFD)was conducted to analyze the effect of taper an-gle between 163°to 175°on fluid field in cyclone separator,which was utilized for natural gas pur-ification by using RNG k-epsilon turbulent model and discrete phase model in FLUENT fluid a-nalysis software platform.Some conclusions could be received from the numerical simulation.The greatest changes of velocity and pressure were occurred near the entrance of riser;and there was almost no influence on cylinder and some cone area with different tapers;however,the impact of taper on the riser and most cone area was significant.On the other hand,the distribution of flow field would not be affected by taper as a whole.The separation efficiency of gas-solid is 100% due to the 5 μm minimum particle size,but there is stacked phenomenon inside the cyclone separator which is serious near the roof.Finally,the best structure of cyclone separator was chose with 172° taper what meant a 0.925 m cone length.This structure had the lowest pressure drop and less ma-terial consuming.