With the continuous acceleration of social and economic development and the increasing expansion of boiler production scale, circulating fluidized bed boiler has become a necessary facility for industrial production. ...With the continuous acceleration of social and economic development and the increasing expansion of boiler production scale, circulating fluidized bed boiler has become a necessary facility for industrial production. Affected by various factors, the water wall tube explosion of circulating fluidized bed boiler is very easy to occur during operation, which seriously affects the economic and safety benefits during the production, operation and construction of the enterprise. In view of this, taking 130t / h circulating fluidized bed boiler as an example, this paper puts forward the macro damage of the outlet nozzle of the circulating fluidized bed boiler, analyzes the macro and micro morphology of the fracture of the cracked pipe, and carries out micro hardness test and tensile test on the mechanical properties of the outlet nozzle. Finally, the reasons leading to the cracks in the export results are obtained, and the corresponding preventive countermeasures are formulated based on these reasons, in order to provide theoretical help for relevant staff.展开更多
Aiming at harsh environment of cluster bombs center tube explosion dispersion and difficulties in installation of traditional test systems,a storage test system based on 16-bit ultra-low power microcontroller MSP430 i...Aiming at harsh environment of cluster bombs center tube explosion dispersion and difficulties in installation of traditional test systems,a storage test system based on 16-bit ultra-low power microcontroller MSP430 is designed in order to acquire gas pressure during cluster bombs dispersion.To meet the requirement of low power consumption,the working states of system＇s modules during data acquisition are elaborated and the equation to calculate the gas pressure change during cylindrical center tube opening the hatch is deduced.The field test is conducted and good test results are obtained.展开更多
Explosive blast injury has become the most prevalent injury in recent military conflicts and terrorist attacks. The magnitude of this kind of polytrauma is complex due to the basic physics of blast and the surrounding...Explosive blast injury has become the most prevalent injury in recent military conflicts and terrorist attacks. The magnitude of this kind of polytrauma is complex due to the basic physics of blast and the surrounding environments. Therefore, development of stable, reproducible and controllable animal model using an ideal blast simulation device is the key of blast injury research. The present review addresses the modeling of blast injury and applications of shock tubes.展开更多
The deflagration-to-detonation transitions (DDTs) for clouds of spherical aluminum dust (SAD) mixed with air or epoxypropane mist (EPM) and air were investigated in a 29.6-m-long experimental tube of 199 mm in diamete...The deflagration-to-detonation transitions (DDTs) for clouds of spherical aluminum dust (SAD) mixed with air or epoxypropane mist (EPM) and air were investigated in a 29.6-m-long experimental tube of 199 mm in diameter. The clouds formed through the injection of SAD and SAD/liquid epoxypropane samples into the experimental tube. Explosions of the SAD/air mixture were initiated using a 7-m-long EPM/air cloud explosion ignited by a 40-J electric spark. Explosions in SAD/EPM/air clouds were initiated using a 1.2-m EPM/air cloud explosion ignited by a 40-J electric spark initiated using a 40-J electric spark. Self-sustained detonation waves formed in SAD/EPM/air mixtures instead of in SAD/air mixtures. The stages and characteristics of the DDT process in SAD/air and SAD/EPM/air mixtures were studied and analyzed. Self-sustained detonation was evident from the existence of a transverse wave and a cellular structure. Moreover, a retonation wave formed during the DDT process in SAD/EPM/air clouds.展开更多
文摘With the continuous acceleration of social and economic development and the increasing expansion of boiler production scale, circulating fluidized bed boiler has become a necessary facility for industrial production. Affected by various factors, the water wall tube explosion of circulating fluidized bed boiler is very easy to occur during operation, which seriously affects the economic and safety benefits during the production, operation and construction of the enterprise. In view of this, taking 130t / h circulating fluidized bed boiler as an example, this paper puts forward the macro damage of the outlet nozzle of the circulating fluidized bed boiler, analyzes the macro and micro morphology of the fracture of the cracked pipe, and carries out micro hardness test and tensile test on the mechanical properties of the outlet nozzle. Finally, the reasons leading to the cracks in the export results are obtained, and the corresponding preventive countermeasures are formulated based on these reasons, in order to provide theoretical help for relevant staff.
文摘Aiming at harsh environment of cluster bombs center tube explosion dispersion and difficulties in installation of traditional test systems,a storage test system based on 16-bit ultra-low power microcontroller MSP430 is designed in order to acquire gas pressure during cluster bombs dispersion.To meet the requirement of low power consumption,the working states of system＇s modules during data acquisition are elaborated and the equation to calculate the gas pressure change during cylindrical center tube opening the hatch is deduced.The field test is conducted and good test results are obtained.
基金We gratefully appreciate Academician Wang ZG for critically reading and editing the manuscript. This work was supported by the grants from National Natural Science Foundation of China （No. 81201461 ）, Key Project of Medicine and Health of PLA （No. 08G098） and the Natural Science Foundation of Chongqing, China （No. CSTC2012jjA10107）.
文摘Explosive blast injury has become the most prevalent injury in recent military conflicts and terrorist attacks. The magnitude of this kind of polytrauma is complex due to the basic physics of blast and the surrounding environments. Therefore, development of stable, reproducible and controllable animal model using an ideal blast simulation device is the key of blast injury research. The present review addresses the modeling of blast injury and applications of shock tubes.
基金supported by the National Natural Science Foundation of China (Grant No. 10772032)the Foundation of State Key Lab of Explosion Science and Technology (Grant Nos. ZDKT08-2-6, YBKT09-1)the National Basic Research Program of China (Grant No. 2011CB706900)
文摘The deflagration-to-detonation transitions (DDTs) for clouds of spherical aluminum dust (SAD) mixed with air or epoxypropane mist (EPM) and air were investigated in a 29.6-m-long experimental tube of 199 mm in diameter. The clouds formed through the injection of SAD and SAD/liquid epoxypropane samples into the experimental tube. Explosions of the SAD/air mixture were initiated using a 7-m-long EPM/air cloud explosion ignited by a 40-J electric spark. Explosions in SAD/EPM/air clouds were initiated using a 1.2-m EPM/air cloud explosion ignited by a 40-J electric spark initiated using a 40-J electric spark. Self-sustained detonation waves formed in SAD/EPM/air mixtures instead of in SAD/air mixtures. The stages and characteristics of the DDT process in SAD/air and SAD/EPM/air mixtures were studied and analyzed. Self-sustained detonation was evident from the existence of a transverse wave and a cellular structure. Moreover, a retonation wave formed during the DDT process in SAD/EPM/air clouds.
