Based on the“three box”exergy analysis model,a black box-gray box hierarchical exergy analysis and evaluation method is put forward in this paper,which is applied to evaluate the power generation technology of diffe...Based on the“three box”exergy analysis model,a black box-gray box hierarchical exergy analysis and evaluation method is put forward in this paper,which is applied to evaluate the power generation technology of differential pressure produced by natural gas expansion.By using the exergy analysis theory,the black box-gray box hierarchical exergy analysis models of three differential pressure power generation technologies are established respectively.Firstly,the“black box”analysis models of main energy consuming equipment are established,and then the“gray box”analysis model of the total system is established.Based on the calculation results of exergy analysis indexes,the weak energy consumption equipment in the whole power generation process is accurately located.Taking a gas field in southwest China as an example,the comprehensive energy consumption evaluation of the three power generation technologies is carried out,and the technology with the best energy consumption condition among the three technologies is determined.Finally,the rationalization improvement measures are put forward from improving the air tightness,replacing the deflector and reducing the flow loss.展开更多
To the Editor： Endobronchial ultrasound （EBUS） has been utilized as a useful noninvasive diagnostic tool for mediastinal lymph nodes or masses. Recently, convex probe EBUS （CP-EBUS） has recently come to be used t...To the Editor： Endobronchial ultrasound （EBUS） has been utilized as a useful noninvasive diagnostic tool for mediastinal lymph nodes or masses. Recently, convex probe EBUS （CP-EBUS） has recently come to be used to diagnose central pulmonary embolism.I However, CP-EBUS cannot detect peripheral pulnaonary embolism. It is here believed that the potential use of EBUS is still underestimated.展开更多
基金financially supported by the National Natural Science Foundation of China(52074089 and 51534004)Natural Science Foundation of Heilongjiang Province of China(LH2019E019)。
文摘Based on the“three box”exergy analysis model,a black box-gray box hierarchical exergy analysis and evaluation method is put forward in this paper,which is applied to evaluate the power generation technology of differential pressure produced by natural gas expansion.By using the exergy analysis theory,the black box-gray box hierarchical exergy analysis models of three differential pressure power generation technologies are established respectively.Firstly,the“black box”analysis models of main energy consuming equipment are established,and then the“gray box”analysis model of the total system is established.Based on the calculation results of exergy analysis indexes,the weak energy consumption equipment in the whole power generation process is accurately located.Taking a gas field in southwest China as an example,the comprehensive energy consumption evaluation of the three power generation technologies is carried out,and the technology with the best energy consumption condition among the three technologies is determined.Finally,the rationalization improvement measures are put forward from improving the air tightness,replacing the deflector and reducing the flow loss.
基金This study was-supported by the grants from National Natural Science Foundation of China （No. 81100037 and 81360049） and Science and Technology Program for Public Wellbeing of Yunnan Province （No. 2014RA020）.
文摘To the Editor： Endobronchial ultrasound （EBUS） has been utilized as a useful noninvasive diagnostic tool for mediastinal lymph nodes or masses. Recently, convex probe EBUS （CP-EBUS） has recently come to be used to diagnose central pulmonary embolism.I However, CP-EBUS cannot detect peripheral pulnaonary embolism. It is here believed that the potential use of EBUS is still underestimated.
