With Pueraria edulis from different habitats in Yunnan Province,Guangdong Province and Guangxi Zhuang autonomous region as materials,the medicinal materials of P.edulis were extracted by ethanol condensation reflux ex...With Pueraria edulis from different habitats in Yunnan Province,Guangdong Province and Guangxi Zhuang autonomous region as materials,the medicinal materials of P.edulis were extracted by ethanol condensation reflux extraction and ultrasound-assisted extraction,and the effects of different extraction methods the contents of total flavonoids in P.edulis from different areas were compared.The results showed that the best extraction time for P.edulis in Yunnan Province was 20 min,and that for Guangdong and Guangxi Zhuang Autonomous Region was 30 min.The yield of total flavonoids from P.edulis extracted by the condensation reflux extraction method was relatively better.The content of total flavonoids in P.edulis in Yunnan was the highest with an average content of 0.2557%,while the average content of total flavonoids in P.edulis in Guangdong was the lowest with an average content of 0.2108%.展开更多
Due to the improvement of thermal power technology and efficiency, steam turbine units are becoming larger and larger. Small steam turbines that have been used for decades are being eliminated. Especially, the extract...Due to the improvement of thermal power technology and efficiency, steam turbine units are becoming larger and larger. Small steam turbines that have been used for decades are being eliminated. Especially, the extraction turbine used in chemical production is generally small, with low power generation efficiency and high coal consumption. However, as it is mainly used for steam balancing and regulating production, some use waste heat and some use it as front-end turbine. Reducing the coal consumption index to the allowable range will be more effective in enhancing the stability of the production system and saving energy. This is exactly the case with the CC25-8.83/4.02/0.58 steam turbine used by our company. The steam turbine was put into operation in 2008 and forced to shut down for back pressure modification in 2020. The newly modified back pressure turbine model is B7-8.83/4.0. This paper mainly expounds the technical key points of transforming the pumping condensing turbine into a high back pressure turbine, and analyzes its economic benefits, combining with specific transformation examples.展开更多
基金Supported by Hunan Provincial University Innovation Platform Open Fund Project(19K049)。
文摘With Pueraria edulis from different habitats in Yunnan Province,Guangdong Province and Guangxi Zhuang autonomous region as materials,the medicinal materials of P.edulis were extracted by ethanol condensation reflux extraction and ultrasound-assisted extraction,and the effects of different extraction methods the contents of total flavonoids in P.edulis from different areas were compared.The results showed that the best extraction time for P.edulis in Yunnan Province was 20 min,and that for Guangdong and Guangxi Zhuang Autonomous Region was 30 min.The yield of total flavonoids from P.edulis extracted by the condensation reflux extraction method was relatively better.The content of total flavonoids in P.edulis in Yunnan was the highest with an average content of 0.2557%,while the average content of total flavonoids in P.edulis in Guangdong was the lowest with an average content of 0.2108%.
文摘Due to the improvement of thermal power technology and efficiency, steam turbine units are becoming larger and larger. Small steam turbines that have been used for decades are being eliminated. Especially, the extraction turbine used in chemical production is generally small, with low power generation efficiency and high coal consumption. However, as it is mainly used for steam balancing and regulating production, some use waste heat and some use it as front-end turbine. Reducing the coal consumption index to the allowable range will be more effective in enhancing the stability of the production system and saving energy. This is exactly the case with the CC25-8.83/4.02/0.58 steam turbine used by our company. The steam turbine was put into operation in 2008 and forced to shut down for back pressure modification in 2020. The newly modified back pressure turbine model is B7-8.83/4.0. This paper mainly expounds the technical key points of transforming the pumping condensing turbine into a high back pressure turbine, and analyzes its economic benefits, combining with specific transformation examples.
