- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | HUANG Hongying, LUO Yi, GUAN Huisheng, MA Haicheng. Conveying Efficiency Analysis of Vacuum Pneumatic Slagging of Shaft Boring Machine[J].Journal of Southwest Jiaotong University.doi:10.3969/j.issn.0258-2724.20240255
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For the purpose of improving the conveying efficiency of the vacuum pneumatic slagging system of the shaft boring machine (SBM) and addressing low conveying efficiency caused by the mismatch between the parameters of the slagging system and the rock slag, the effect of conveying system parameters on slagging efficiency was investigated based on single factor analysis method and orthogonal test method. Firstly, a parameter and pressure loss calculation model for the vacuum pneumatic slagging system was constructed based on fluid mechanics to determine the key parameters of the system. Then, the Fluent software was used to simulate the process of vacuum pneumatic slagging, and the outlet velocity of rock slag and the average gas pressure drop were taken as the consideration index of slag conveying efficiency. The single factor analysis method was used to study the influence of four factors, including inner diameter of pipe, gas velocity, rock slag particle size, and rock slag density, on the conveying efficiency. The multi-factor analysis was carried out based on the orthogonal test method, and the non-dominated sorting genetic algorithm was applied to obtain the Pareto frontier solution set. Finally, the slag conveying efficiency test of the vacuum pneumatic slagging system was carried out. The results show that the influence of gas velocity and rock slag particle size on the outlet velocity of rock slag is the most significant, and the influence of inner diameter of pipe and gas velocity on the average gas pressure drop is the most significant. In addition, the average gas pressure drop and the outlet velocity of rock slag cannot reach the optimum simultaneously. When the minimum value of the outlet velocity of rock slag is selected as the best economic conveying point, the optimal combination of conveying parameters is as follows: rock slag particle size of 10 mm, inner diameter of pipe of 150 mm, gas velocity of 40 m/s. The research results can provide a reference for the construction application of the vacuum pneumatic slagging system of SBM.
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