| 摘要: |
| 针对传统环筛式锤片饲料粉碎机存在气固环流层影响粉碎机性能的问题，采用理论分析、数值模拟、粉碎性能试验相结合的方法，对粉碎机安装异形筛片时粉碎室内物料颗粒受到的气力作用和内部流场运动规律进行研究。分析粉碎机使用异形筛片对粉碎性能的影响。优化后的异形筛片分别命名为B1(小圆弧半径R1=51 mm)、B2(R1=83 mm)、B3(R1=93 mm)，利用流体动力学软件对粉碎室安装3种异形筛片的气流场进行数值模拟，获得粉碎室气流场分布信息。在相同工况下，对装有3种异形筛片的CPS-420型粉碎机进行粉碎性能试验，分析不同筛片对物料粉碎效果的影响。模拟结果表明:粉碎机采用间隔分段圆弧筛片后，粉碎室环流区域产生不同强度的涡旋，能够改变物料环流运动规律，提高物料过筛能力；锤片组扫过区域的气流呈现出较为杂乱无序的分布状态，有利于形成湍流运动，从而增加物料颗粒受打击几率。粉碎性能试验结果表明:锤片饲料粉碎机安装B3筛片的粉碎机生产效率，较B2、B1筛片分别提高8.1%、16.0%，吨料耗电量分别降低10.5%、15.0%，温升分别降低0.6和0.1 ℃。优化后的3种异形筛片，能够提高粉碎机的生产效率，降低电能的损耗、改善物料温升，对提高锤片饲料粉碎机性能具有积极意义。 |
| 关键词: 粉碎机 异形筛片 数值模拟 粉碎性能 |
| DOI：10.11841/j.issn.1007-4333.2020.03.10 |
| 投稿时间：2019-09-09 |
| 基金项目:国家自然科学基金项目(51765055) |
|
| Numerical simulation and experimental research on the gas flow field of special-shaped sieve sheet of crusher |
|
QIAN Yi1,WANG Di1,ZHANG Jue1,2,TIAN Haiqing1*,YU Yang1
|
| (1.College of Mechanical and Electrical Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China;2.College of Physics and Electronic Information, Inner Mongolia Normal University, Hohhot 010020, China) |
| Abstract: |
| Aiming at the problem of crusher performance influenced by gas-solid circulation layer in traditional ring-sieve hammer feed crusher, a method combining theoretical analysis, numerical simulation and comminution performance test was used to study the aerodynamic effect of crusher on crushing indoor material particles and the movement law of internal flow field installing special-screen shaped crusher was installed. The impact of crusher's use of special-shaped screen on comminution performance was analyzed. The optimized special-shaped screen were named B1(small arc R1=51 mm), B2(R1=83 mm)and B3(R1=93 mm), respectively. The flow field of three special-shaped screens installed in the comminution chamber was simulated numerically by using hydrodynamic software, and the distribution information of the flow field in the comminution chamber was obtained. Comminution performance test was carried out on CPS-420 crusher with three special-shaped screens under the same working conditions. The effect of different sieves on material grinding was analyzed. The simulation results showed that crusher produced different intensities of eddies in the circulating area of crushing chamber after using segmented circular arc screens, which changed the circulation law of materials and improved the sieving ability of materials. The air flow in the area swept by hammers showed a disorderly distribution, which was conductive to the formation of turbulent motion and thus increases material particle hit probability. The results of comminution performance showed that crusher production efficiency of crusher with B3 sieve in hammer feed crusher were 8. 1% and 16% higher than those of B2 and B1 sieve respectively, and the quality of crushed materials ton per electric energy were 10. 5% and 15% higher than those of B2 and B1 sieve respectively. Temperature rise decreased by 0. 6 and 0. 1 ℃ respectively. In conclusion, the three optimized special-shaped screens can improve crusher's production efficiency, reduce power loss and improve material temperature rise, which has positive significance for designing new special-shaped screens and improving crusher performance of hammer feed. |
| Key words: crusher special-shaped screen numerical simulation comminution performance |
