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大直径塔式反应器密相装填过程的数值模拟及试验研究
论文作者:童鞋论文网  论文来源:www.txlunwenw.com  发布时间:2019/9/29 12:02:49  

摘要:近年来,能源化工企业规模不断扩大,为之服务的能源化工装备不断趋向大型化。固定床塔式反应器是能源化工过程工业的重要设备,亦向着大型化的方向发展,若任采用已有的密相装填设备则需要不断增大布料盘转速,这不仅给电机和旋转轴增加了负担,而且难以保证料面的平整度,需要开发新的布料盘以降低电机转速。

采用离散元法模拟软件(EDEM)分别模拟正锥和倒锥两种结构简单布料盘的密相装填过程。首先,为降低计算机运算量,探求了颗粒的简化模型。然后分别探讨两种结构布料盘的结构参数和操作参数对密相装填过程的影响,并以标准差评价床层平整度,以获取优化的布料盘结构参数。结果表明,等体积柱状颗粒的受力和运动规律与三叶草颗粒更为相似;正锥形布料盘直径d1为600mm,槽宽b1为12mm,加料速度Q为1.5 kg/s,转速n为200 r/min时,床层平整度最好;倒锥形布料盘的主体直径为360 mm,锥角约为90°(大锥角),开槽形式为等槽宽螺旋线,加料速度Q为1.5 kg/s,转速n为300 r/min时,床层平整度最好,开槽宽度b2为12mm时,布撒颗粒大小D×L为3mm×9mm最为合适。

对模拟的优化结构进行试验验证,分析正锥形布料盘的过槽率和分布半径以及大锥角倒锥形布料盘的分布半径和平整度。结果表明,试验与模拟的结果具有较高的一致性,正锥形布料盘在2m高度下难以实现大直径抛撒,而大锥角倒锥形布料盘能够实现大直径抛撒,且能够保证良好的平整度。

中石化石家庄炼化分公司的大直径塔式反应器装填结果表明,大锥角倒锥形布料盘的使用能够有效改善床层平整度,提升装填密度,降低布料盘转速,实现大直径均匀的密相装填。

In recent years, the scale of energy andchemical enterprises has been expanding, and the energy and chemical equipmentserving for them is becoming larger and larger. Fixed-bed tower reactor is animportant equipment in energy and chemical industry, and it is also developingtowards large-scale. If the existing dense loading equipments were used, therotational speed of the distributors should be continuously increased, whichnot only increases the burden on the motor and the rotating shaft, but alsomakes it difficult to ensure the smoothness of the material surface. Therefore,it is necessary to develop new distributors to reduce the rotational speed ofthe motor.

Discrete element method simulation software(EDEM) was used to simulate the dense loading process of two kinds of simpledistributors with normal and inverted cones, respectively. Firstly, in order toreduce the computational complexity of computer, the simplified model ofparticles is explored. Then, the effects of the structural and operationalparameters of the two structures of distributors on dense loading process arediscussed, and the bed smoothness is evaluated by standard deviation to obtainthe optimized structural parameters of the distributors. The results show thatthe force and motion law of equal volume cylindrical particles are more similarto those of clover particles; the bed smoothness is the best when the diameterd1 is 600 mm, the groove width b1 is 12 mm, the feeding speed Q is 1.5 kg/s andthe rotating speed n is 200 r/min; when the main diameter of inverted conicaldistributor d2 is 360 mm, the cone angle α is about 90 degrees (large coneangle), the grooving form is a spiral line with equal groove width, the feedingspeed Q is 1.5 kg/s and the rotational speed n is 300 r/min, the bed smoothnessis the best; when the slotting width b2 is 12 mm, the particles, which particlesize D×L is 3 mm×9 mm, are appropriate to spread.

The simulated optimized structure wastested and verified. The through-slot rate and distribution radius of theregular conical distributor and the distribution radius and uniformity of thewide angle inverted cone distributor were analyzed. The results show that theexperimental results are in good agreement with the simulation results. It isdifficult to achieve large diameter spread of the regular conical distributorat 2 m height, while the wide angle inverted cone distributor can achieve largediameter spread, and can ensure good smoothness.

The loading results of large diameter reactorin Shijiazhuang Refinery and Chemical Company of Sinopec show that the use ofwide angle inverted cone distributor can effectively improve the bedsmoothness, increase the loading density, reduce the rotational speed of thedistributor, and realize uniform dense loading of the large diameter reactor.

关键词:大直径塔式反应器;密相装填;离散元法;数值模拟;标准差;试验研究

large diameter reactor; dense loading; DEM;numerical simulation; standard deviation; experimental research

上一篇:剪切稀化流体内单气泡上浮特性的研究     下一篇:球形气泡界面浓度对其界面参数和上浮运动特性影响研究
 
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