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Guo G.,China Railway Large Maintenance Machinery Ltd Company of Kunming
Zhongguo Tiedao Kexue/China Railway Science | Year: 2013

Because of lacking the enough waste suction ability of track waste suction apparatus and polluting surroundings, suction airflow circulating solution has been brought forward. All airflow of blowing fan provides unilateral blowing orifice for blowing waste. The discharging airflow of suction fan provides another unilateral blowing orifice for blowing waste. The waste suction ability has greatly strengthened when the flux and airflow velocity of suction airflow circulating as blowing air is adjusting by make a change in the airflow orifice. According to hydrodynamics principle, we hypothesized that the viscous force and the variation of density of airflow could be negligible and different velocity airflow mixing had no energy loss. The waste suction capacity and energy consumption characteristics of the waste suction apparatus had been researched. Results show that when the moving velocity of the waste suction apparatus is 10 km·h-1, it can absorb neatly the monolayer stones and the iron filings with the particle diameters of 14.3 and 5 mm respectively. Compared with the old track waste suction apparatus, the maximum particle diameter of suction particles is improved by about 7 times and the absorption rate is more than 98%. The power of its operation saves 74 kW and the energy consumption decreases 20%.


Guo G.-Z.,China Railway Large Maintenance Machinery Ltd Company of Kunming
Tiedao Xuebao/Journal of the China Railway Society | Year: 2014

In view that the conventional track waste removing apparatus can only fulfill a single function, a novel track waste removing apparatus was designed in which the sedimentation removing function and the filtration removing function were integrated and the respective advantages of the two waste removing functions were utilized. Waste airflow was introduced first into a sedimentation device to remove from it the waste particles of large sizes and high specific gravities and then into a filtration device to remove the waste particles of small sizes and low specific gravities. So the new apparatus can remove a variety of waste particles, save the working space and prolong the lifetime of filter bags. According to the principles of hydromechanics, the waste removing capacity of the new apparatus was calculated and experimentally tested by neglecting the viscous force and density variation of airflow and not considering the boundary effect and nonuniformity of airflow. The results show as follows: When the waste suction airflow flux is 80 000 m3/h, sedimentation can remove iron filings, stones and dusts with the diameters being greater than 0.07 mm, 0.21 mm and 0.47 mm respectively, the filtration pressure drop is 750 Pa, the filter bag pore diameter is 8.3 μm, the effective filtration area is 126 m2 and the efficiency of filtration removing is over 99%; the dust content of the discharged airflow is 20 mg/m3 and waste particles of excessive diameters were not detected in the exhausted airflow.


Guo G.,China Railway Large Maintenance Machinery Ltd Company of Kunming
Zhongguo Tiedao Kexue/China Railway Science | Year: 2012

By utilizing the new track suction waste apparatus made of tabular and slantwise jet nozzle and spacious roomy suction nozzle, we hypothesized that the viscous force, the variation of density of airflow, the difference between the angle of jet and angle of deviating track and suction of flow's influence on the blower of flow could be negligible. The waste suction capacity of new track waste suction apparatus had been researched. Results show that when the critical moving velocity of the suction apparatus is 10 km·h -1, the new suction apparatus at 8×10 4 m 3·h -1 airflow flux has the same waste suction capacity with the French VAKTRAK09 track suction waste apparatus at 28×10 4 m 3·h -1 airflow flux. The critical suction waste capacity of new apparatus is associated with the critical blowing air velocity, critical suction air velocity and the critical moving velocity. When both the velocity of blowing and suction airflow is invariable, the critical suction waste capacity depends on the critical moving velocity of the new apparatus. The test has proved that the new apparatus has better suction waste performance at the jet angle of 60°.

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