The energy saving of hydraulic excavators is always an essential research.An energy recovery system can effectively recover the boom potential energy and rotational kinetic energy.Based on the standard working cycle o...The energy saving of hydraulic excavators is always an essential research.An energy recovery system can effectively recover the boom potential energy and rotational kinetic energy.Based on the standard working cycle of hydraulic excavators,a dynamic programming(DP)control strategy for hybrid hydraulic excavators was proposed to recover the boom potential energy and rotational kinetic energy.The hybrid hydraulic excavator simulation model was built by Simulink software.The simulation results indicated that the fuel consumption of hybrid hydraulic excavators using the DP control strategy was about 21.3%lower than that of the conventional hydraulic excavator.In order to experimentally verify the simulation results,an experimental platform for hybrid hydraulic excavators was built.The experimental results indicated that the fuel consumption of hybrid hydraulic excavators using the DP control strategy was about 18.9%lower than that of the conventional hydraulic excavator.This paper shows that the DP control strategy applied to hybrid hydraulic excavators can recycle the boom potential energy and rotational kinetic energy,and reduce the fuel consumption of hybrid hydraulic excavators.展开更多
Thermal loss of exhaust flue gas accounts for the largest proportion of the total boiler thermal loss. Nowadays in China, the exhaust gas temperature in many thermal power plants is much higher than the designed value...Thermal loss of exhaust flue gas accounts for the largest proportion of the total boiler thermal loss. Nowadays in China, the exhaust gas temperature in many thermal power plants is much higher than the designed value, thus, the recycle and reuse of the waste heat of tail flue gas is necessary. However, lower exhaust gas temperature will aggravate low temperature corrosion of the tail heating surface, which also causes huge economic losses. In order to solve this problem, this paper designs a monitoring experiment platform of flue gas low temperature corrosion, which can measure the corrosion condition of different materials by different flue gas compositions and temperature corrosion speeds. Besides, effects of low temperature corrosion factors are analyzed to find the best exhaust gas temperature and the surface material of tail heating surface.展开更多
In order to study 5 cultivation models such as arbor-shrub, arbor-shrub-herb and their disposition for vegetation recovery, 10 arbor species, 7 shrub species and 5 herb species suitalde for locat sites were choiced at...In order to study 5 cultivation models such as arbor-shrub, arbor-shrub-herb and their disposition for vegetation recovery, 10 arbor species, 7 shrub species and 5 herb species suitalde for locat sites were choiced at waste heap platform of Fushun Coal Mine. The experiment adopted the randomized block design, three replicates, with 0.067 hm^2 at each thinned plot. The experiment results of 2-year vegetation recovery showed that the survival rate of woody plants was significantly different among species and there existed significant differences in ground diameter and height increments. The results of the initial stage of the experiment showed that the disposition of A and C were the optimal cultivation models, and Robinia pesudoacacia, Hippophae rhamnoides,Amorpha fruticosa, Caragana chamlagu, Ulmus pumila were the best tree species for arbor-shrub-herb disposition.展开更多
基金jointly sponsored by the National Key R&D Program of China(Grant No.2023YFC3010904)the National Key R&D Program of China(Grant No.2021YFC3002003)the Science and Technology Research and Major Achievement Transformation Project of Strategic Emerging Industries in Hunan Province(Grant No.2019GK4014).
文摘The energy saving of hydraulic excavators is always an essential research.An energy recovery system can effectively recover the boom potential energy and rotational kinetic energy.Based on the standard working cycle of hydraulic excavators,a dynamic programming(DP)control strategy for hybrid hydraulic excavators was proposed to recover the boom potential energy and rotational kinetic energy.The hybrid hydraulic excavator simulation model was built by Simulink software.The simulation results indicated that the fuel consumption of hybrid hydraulic excavators using the DP control strategy was about 21.3%lower than that of the conventional hydraulic excavator.In order to experimentally verify the simulation results,an experimental platform for hybrid hydraulic excavators was built.The experimental results indicated that the fuel consumption of hybrid hydraulic excavators using the DP control strategy was about 18.9%lower than that of the conventional hydraulic excavator.This paper shows that the DP control strategy applied to hybrid hydraulic excavators can recycle the boom potential energy and rotational kinetic energy,and reduce the fuel consumption of hybrid hydraulic excavators.
文摘Thermal loss of exhaust flue gas accounts for the largest proportion of the total boiler thermal loss. Nowadays in China, the exhaust gas temperature in many thermal power plants is much higher than the designed value, thus, the recycle and reuse of the waste heat of tail flue gas is necessary. However, lower exhaust gas temperature will aggravate low temperature corrosion of the tail heating surface, which also causes huge economic losses. In order to solve this problem, this paper designs a monitoring experiment platform of flue gas low temperature corrosion, which can measure the corrosion condition of different materials by different flue gas compositions and temperature corrosion speeds. Besides, effects of low temperature corrosion factors are analyzed to find the best exhaust gas temperature and the surface material of tail heating surface.
文摘In order to study 5 cultivation models such as arbor-shrub, arbor-shrub-herb and their disposition for vegetation recovery, 10 arbor species, 7 shrub species and 5 herb species suitalde for locat sites were choiced at waste heap platform of Fushun Coal Mine. The experiment adopted the randomized block design, three replicates, with 0.067 hm^2 at each thinned plot. The experiment results of 2-year vegetation recovery showed that the survival rate of woody plants was significantly different among species and there existed significant differences in ground diameter and height increments. The results of the initial stage of the experiment showed that the disposition of A and C were the optimal cultivation models, and Robinia pesudoacacia, Hippophae rhamnoides,Amorpha fruticosa, Caragana chamlagu, Ulmus pumila were the best tree species for arbor-shrub-herb disposition.
