Steam mining method was injecting hot steam into the borehole to heat the hydrate strata at the same time of depressurization mining,which could promote further decomposition and expand mining areas of gas hydrate. St...Steam mining method was injecting hot steam into the borehole to heat the hydrate strata at the same time of depressurization mining,which could promote further decomposition and expand mining areas of gas hydrate. Steam heat calculation would provide the basis for the design of heating device and the choice of the field test parameters. There were piping heat loss in the process of mining. The heat transfer of steam flowing in the pipe was steady,so the heat loss could be obtained easily by formula calculation. The power of stratum heating should be determined by numerical simulation for the process of heating was dynamic and the equations were usually nonlinear. The selected mining conditions were 500-millimeter mining radius,10 centigrade mining temperature and 180 centigrade steam temperature. Heat loss and best heating power,obtained by formula calculation and numerical simulation,were 21. 35 W/m and 20 kW.展开更多
During the summer monsoon season,the authors observe a wave train that stretches from the northern Arabian Peninsula and Caspian Sea to the Indo-Gangetic plains along the foothills of the Himalaya and extending furthe...During the summer monsoon season,the authors observe a wave train that stretches from the northern Arabian Peninsula and Caspian Sea to the Indo-Gangetic plains along the foothills of the Himalaya and extending further east of the Tibetan Plateau.The trend analysis between 1979 and 2018 with NCEP–NCAR reanalysis data show that the diabatic heating flux(averaged over 1000 to 500 hPa)tends to decrease significantly over the Caspian Sea and its surrounding regions.In addition,the sea level pressure is increasing by^0.1 hPa yr-1 over the Caspian Sea,forming a high-pressure divergent center over there.The divergent center is collocated with an anticyclonic circulation trend at 850 hPa over the Caspian Sea.This decreasing diabatic heating flux modulates the local atmospheric circulation by increasing the surface pressure around the center of divergence,which further facilitates a wave train to propagate towards South and East Asia.This wave train transports the moisture fluxes at 925 h Pa from the Caspian Sea,southeastward towards the South and East Asian monsoon region.展开更多
One of ways of intensification of process of manufacture of heterogeneous tinned products of fruits and vegetables is the use of sated water steam （Patent of USSR No. 500792）. This process at application as consumer...One of ways of intensification of process of manufacture of heterogeneous tinned products of fruits and vegetables is the use of sated water steam （Patent of USSR No. 500792）. This process at application as consumer glass container for such products is especially effective. However, there are some questions which are connected with thermal influence on glass container at realization of such heating. The given research is devoted as the decision of practical questions arising at process engineers.展开更多
基金Supported by project of China Geological Surrey(No.GZHL20110326)
文摘Steam mining method was injecting hot steam into the borehole to heat the hydrate strata at the same time of depressurization mining,which could promote further decomposition and expand mining areas of gas hydrate. Steam heat calculation would provide the basis for the design of heating device and the choice of the field test parameters. There were piping heat loss in the process of mining. The heat transfer of steam flowing in the pipe was steady,so the heat loss could be obtained easily by formula calculation. The power of stratum heating should be determined by numerical simulation for the process of heating was dynamic and the equations were usually nonlinear. The selected mining conditions were 500-millimeter mining radius,10 centigrade mining temperature and 180 centigrade steam temperature. Heat loss and best heating power,obtained by formula calculation and numerical simulation,were 21. 35 W/m and 20 kW.
基金supported by the Ministry of Science and Technology of China grant number 2016YFA0600604the National Natural Science Foundation of China grant numbers 41950410756 and 41675061the Key Research Program of Frontier Sciences,Chinese Academy of Sciences grant number QYZDY-SSW-DQC024。
文摘During the summer monsoon season,the authors observe a wave train that stretches from the northern Arabian Peninsula and Caspian Sea to the Indo-Gangetic plains along the foothills of the Himalaya and extending further east of the Tibetan Plateau.The trend analysis between 1979 and 2018 with NCEP–NCAR reanalysis data show that the diabatic heating flux(averaged over 1000 to 500 hPa)tends to decrease significantly over the Caspian Sea and its surrounding regions.In addition,the sea level pressure is increasing by^0.1 hPa yr-1 over the Caspian Sea,forming a high-pressure divergent center over there.The divergent center is collocated with an anticyclonic circulation trend at 850 hPa over the Caspian Sea.This decreasing diabatic heating flux modulates the local atmospheric circulation by increasing the surface pressure around the center of divergence,which further facilitates a wave train to propagate towards South and East Asia.This wave train transports the moisture fluxes at 925 h Pa from the Caspian Sea,southeastward towards the South and East Asian monsoon region.
文摘One of ways of intensification of process of manufacture of heterogeneous tinned products of fruits and vegetables is the use of sated water steam （Patent of USSR No. 500792）. This process at application as consumer glass container for such products is especially effective. However, there are some questions which are connected with thermal influence on glass container at realization of such heating. The given research is devoted as the decision of practical questions arising at process engineers.
