面向厌氧发酵的酒糟-废水混合流动特性模拟研究
X505; 酒糟厌氧发酵是当前处理酒糟的有效手段,而基于水力碎浆机的酒糟分离技术在保证稻壳和发酵有机质分离的基础上,具有简化设备并降低能耗的优势.采用ANSYS Fluent软件对水力碎浆机内部的酒糟-废水两相流动进行CFD模拟,从速度场、压力场、组分场及流线等方面详细研究了稻壳、有机质和废水的混合流动规律,并进行了稳态和瞬态的流场研究.模拟结果表明,水力碎浆机内转子顶部弯叶内侧的浆料可达到最大速度48.06 m/s,并且沿径向逐渐向外衰减至接近于0;由于转子的高速旋转,其前后分别形成了高压区和低压区,最大工作压力为3.06x105 Pa;浆液整体呈现离心运动,压力由中心向壁面递增,中心处转子...
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| Published in | 能源环境保护 Vol. 38; no. 6; pp. 105 - 111 |
|---|---|
| Main Authors | , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
天津大学环境科学与工程学院,天津 300072%天津商业大学机械工程学院,天津 300134%中节能绿碳环保有限公司,北京 100082
01.12.2024
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| Subjects | |
| Online Access | Get full text |
| ISSN | 2097-4183 |
| DOI | 10.20078/j.eep.20240306 |
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| Abstract | X505; 酒糟厌氧发酵是当前处理酒糟的有效手段,而基于水力碎浆机的酒糟分离技术在保证稻壳和发酵有机质分离的基础上,具有简化设备并降低能耗的优势.采用ANSYS Fluent软件对水力碎浆机内部的酒糟-废水两相流动进行CFD模拟,从速度场、压力场、组分场及流线等方面详细研究了稻壳、有机质和废水的混合流动规律,并进行了稳态和瞬态的流场研究.模拟结果表明,水力碎浆机内转子顶部弯叶内侧的浆料可达到最大速度48.06 m/s,并且沿径向逐渐向外衰减至接近于0;由于转子的高速旋转,其前后分别形成了高压区和低压区,最大工作压力为3.06x105 Pa;浆液整体呈现离心运动,压力由中心向壁面递增,中心处转子周边由于流动形成极大负压,带动中心浆料向下运动,而壁面处压力最大,达0.125 MPa;稳态计算下,水力碎浆机能实现良好混合,混合后浆料固相体积分数为5.72％～5.81％;转子下方的狭缝区域为盲区,此处固定相体积分数达最大值5.81％,因此,可适当提高转子的高度以改进水力碎浆机的性能;瞬态计算下,8 min碎浆过程即可达到所需的混合效果.另外,总结了酒糟-废水混合流动规律,即来自顶部中心的酒糟主要是在重力作用下开始下降,随后在靠近水力碎浆机的区域被转子旋转带入左侧或右侧的漩涡区,从而与浆液良好地混合;而来自顶部侧边的酒糟在重力作用下降时,更快地参与了左右两侧的大漩涡运动.研究结果对于优化酒糟-废水制浆运行参数具有重要意义. |
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| AbstractList | X505; 酒糟厌氧发酵是当前处理酒糟的有效手段,而基于水力碎浆机的酒糟分离技术在保证稻壳和发酵有机质分离的基础上,具有简化设备并降低能耗的优势.采用ANSYS Fluent软件对水力碎浆机内部的酒糟-废水两相流动进行CFD模拟,从速度场、压力场、组分场及流线等方面详细研究了稻壳、有机质和废水的混合流动规律,并进行了稳态和瞬态的流场研究.模拟结果表明,水力碎浆机内转子顶部弯叶内侧的浆料可达到最大速度48.06 m/s,并且沿径向逐渐向外衰减至接近于0;由于转子的高速旋转,其前后分别形成了高压区和低压区,最大工作压力为3.06x105 Pa;浆液整体呈现离心运动,压力由中心向壁面递增,中心处转子周边由于流动形成极大负压,带动中心浆料向下运动,而壁面处压力最大,达0.125 MPa;稳态计算下,水力碎浆机能实现良好混合,混合后浆料固相体积分数为5.72％～5.81％;转子下方的狭缝区域为盲区,此处固定相体积分数达最大值5.81％,因此,可适当提高转子的高度以改进水力碎浆机的性能;瞬态计算下,8 min碎浆过程即可达到所需的混合效果.另外,总结了酒糟-废水混合流动规律,即来自顶部中心的酒糟主要是在重力作用下开始下降,随后在靠近水力碎浆机的区域被转子旋转带入左侧或右侧的漩涡区,从而与浆液良好地混合;而来自顶部侧边的酒糟在重力作用下降时,更快地参与了左右两侧的大漩涡运动.研究结果对于优化酒糟-废水制浆运行参数具有重要意义. |
| Abstract_FL | Anaerobic fermentation of distiller's grains(DG)is an effective method to treat DG.The DG separation technology,based on a hydraulic pulper,simplifies equipment and reduces energy consumption while ensuring the separation of rice husks and fermented organic matter.ANSYS Fluent,a widely used computational fluid dynamics(CFD)software,was used to simulate the two-phase flow of DG wastewater in the hydraulic pulper.The study focused on the mixed flow characteristics of rice husk,organic matter,and wastewater,investigating the velocity field,pressure field,composition field,flow lines,as well as the steady-state and transient flow fields.The simulation results showed that the slurry inside the curved blade at the top of the rotor reached a maximum velocity of 48.06 m/s and gradually decreased to zero along the radial direction.Due to the rotor's high-speed rotation,a high-pressure zone and a low-pressure zone were formed on each side of the rotor,with a maximum working pressure of 0.306 MPa.The slurry exhibited centrifugal movement,with the pressure increasing radially from the center towards the wall.The flow around the center formed a significant negative pressure,driving the central slurry downward.The highest pressure was at the wall,reaching 0.125 MPa.A region of low mixing efficiency was observed below the rotor,with the maximum solid concentration reaching 5.81％.Therefore,adjusting the rotor's height in the hydraulic pulper could be beneficial.During transient calculations,the desired mixing effect was achieved within an 8-minute crushing process.The mixed flow process of DG and wastewater can be summarized as follows:DG from the top center fell under the action of gravity and was then rotated by the rotor near the water pulper into the left or right vortex area,resulting in effective mixing with the slurry.DG from the top side quickly joined the swirling motion on both sides as they descended due to gravity.The results are important for optimizing the operating parameter. |
| Author | 张永刚 颜蓓蓓 刘晓芸 陈冠益 张自强 周生权 |
| AuthorAffiliation | 天津大学环境科学与工程学院,天津 300072%天津商业大学机械工程学院,天津 300134%中节能绿碳环保有限公司,北京 100082 |
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| Author_FL | YAN Beibei ZHOU Shengquan LIU Xiaoyun CHEN Guanyi ZHANG Yonggang ZHANG Ziqiang |
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| Author_xml | – sequence: 1 fullname: 颜蓓蓓 – sequence: 2 fullname: 刘晓芸 – sequence: 3 fullname: 周生权 – sequence: 4 fullname: 陈冠益 – sequence: 5 fullname: 张自强 – sequence: 6 fullname: 张永刚 |
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| Keywords | 厌氧发酵 Hydraulic pulper Two-phase flow Anaerobic fermentation Numerical simulation 两相流动 酒糟分离 数值模拟 水力碎浆机 Distiller's grains separation |
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| Title | 面向厌氧发酵的酒糟-废水混合流动特性模拟研究 |
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