Numerical analysis and optimization of the performance of an improved soil crushing and mixing structure

doi:10.16085/j.issn.1000-6613.2022-1023

Abstract

Abstract:

In order to improve the particle mixing performance of crushing and mixing structure in an integrated soil remediation machine of the company, the crushing knife roller device was improved and optimized based on the principle of mixing dynamics and the discrete element method (DEM). The interaction between the discrete particles and the mixing components, the particle distribution, the number of collisions and the power of the crushing knife roller in the mixing system were investigated. The mixing efficiency was quantitatively analyzed using the mixing uniformity and the mixing quality evaluation indexes. The simulation results showed that the second generation equipment was very effective in increasing the number of colliding particles. The optimal spindle speed of the claw machine and the up/middle/down roller devices were 150r/min, 300r/min, 600r/min, 600r/min, respectively, and the total running power was 13.45kW, which was 22.4% of the rated total power of 60kW. The study provided technical guidance for improving the performance of soil remediation all-in-one machine.

Key words: soil remediation, discrete element method, mixing uniformity, particle collision, optimal design

摘要：

为了改善某公司原土壤修复一体机内破碎混拌结构的颗粒混匀效果，本文利用离散颗粒混合动力学原理和离散单元法（discrete element method，DEM）对系统内部破碎刀辊装置进行改进优化和仿真模拟。通过研究混合体系中土壤-药剂离散颗粒和混合部件之间的相互作用、颗粒分布及碰撞次数、滚轴功率，运用混合均匀度、混合质量公式对混合效果进行评价，并探究了各转轴中引起功率变化的主要因素。计算模拟结果显示，第二代设备对土壤碰撞颗粒数的提升效果非常明显，爪机、上中下滚轴最佳运行转速为150r/min、300r/min、600r/min、600r/min，滚轴总功率为13.45kW，是实际滚轴额定总功率60kW的22.4%，该研究结果为改善土壤修复一体机性能提供了理论支撑和技术指导。

关键词: 土壤修复, 离散单元法, 混合均匀度, 颗粒碰撞, 优化设计

CLC Number:

YAN Zihan, CHEN Qunyun, LI Zhuo, FU Rongbing, LI Yanwei, WU Zhigen. Numerical analysis and optimization of the performance of an improved soil crushing and mixing structure[J]. Chemical Industry and Engineering Progress, 2022, 41(S1): 72-80.

颜子涵, 陈群云, 李卓, 付融冰, 李彦伟, 吴志根. 改进型土壤破碎混拌结构的性能数值分析与优化[J]. 化工进展, 2022, 41(S1): 72-80.

Figures/Tables 14

References 24

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不同转速/r·min^-1	土壤单球粒径/cm	药剂单球粒径/cm	混合均匀度	混合质量/%
150，300，600，600（一代）	1.0	0.4	0.0526	79.1
150，300，600，600（一代）	1.0	0.6	0.0697	75.3
150，300，600，600（二代）	1.0	0.6	0.0828	81.6
150，300，600，900（一代）	1.0	0.4	0.0499	80.2
150，300，600，900（二代）	1.0	0.6	0.0881	80.4

不同转速/r·min^-1	土壤单球粒径/cm	药剂单球粒径/cm	混合均匀度	混合质量/%
150，300，600，600（一代）	1.0	0.4	0.0526	79.1
150，300，600，600（一代）	1.0	0.6	0.0697	75.3
150，300，600，600（二代）	1.0	0.6	0.0828	81.6
150，300，600，900（一代）	1.0	0.4	0.0499	80.2
150，300，600，900（二代）	1.0	0.6	0.0881	80.4

爪机 /r·min^-1	破碎混合滚轴/r·min^-1			混合均匀度	混合质量/%
爪机 /r·min^-1	上	中	下	混合均匀度	混合质量/%
150	150	200	150	0.135	69.2
150	150	600	600	0.126	69.9
900	900	900	900	0.165	65.2
1500	1500	1200	1500	0.166	64.3

爪机 /r·min^-1	破碎混合滚轴/r·min^-1			混合均匀度	混合质量/%
爪机 /r·min^-1	上	中	下	混合均匀度	混合质量/%
150	150	200	150	0.135	69.2
150	150	600	600	0.126	69.9
900	900	900	900	0.165	65.2
1500	1500	1200	1500	0.166	64.3

不同转速/r·min^-1	混合均匀度	混合质量/%	平均功率/kW			总功率/kW
不同转速/r·min^-1	混合均匀度	混合质量/%	上	中	下	总功率/kW
150，150，200，150	0.135	69.2	0.612	0.538	0.310	1.46
150，150，600，600	0.126	69.9	1.055	6.308	2.680	10.04
900，900，900，900	0.165	65.2	16.417	11.709	11.313	39.44
1500，1500，1200，1500	0.166	64.3	82.694	29.808	28.098	140.60