After a three-decade surge of impressive growth,foreign direct investment（FDI）in China has showed signs of slowing down.Experts observe that this can be attributed to the profound changes that have taken place in th...After a three-decade surge of impressive growth,foreign direct investment（FDI）in China has showed signs of slowing down.Experts observe that this can be attributed to the profound changes that have taken place in the global industrial chain along with the challenge of China losing its competitive edge in terms of labor, land and natural resources.展开更多
A study of the heat transfer about the heating surface of three commercial 300 MWe CFB boilers was conducted in this work. The heat transfer coefficients of the platen heating surface, the external heat exchanger (EHE...A study of the heat transfer about the heating surface of three commercial 300 MWe CFB boilers was conducted in this work. The heat transfer coefficients of the platen heating surface, the external heat exchanger (EHE) and cyclone separator were calculated according to the relative operation data at different boiler loads. Moreover, the heat transfer coefficient of the waterwall was calculated by heat balance of the hot circuit of the CFB boiler. With the boiler capacity increasing, the heat transfer coefficients of these heating surface increases, and the heat transfer coefficient of the water wall is higher than that of the platen heating surface. The heat transfer coefficient of the EHE is the highest in high boiler load, the heat transfer coefficient of the cyclone separator is the lowest. Because the fired coal is different from the design coal in No.1 boiler, the ash content of the fired coal is much lower than that of the design coal. The heat transfer coefficients which calculated with the operation data are lower than the previous design value and that is the reason why the bed temperature is rather high during the boiler operation in No.1 boiler.展开更多
文摘After a three-decade surge of impressive growth,foreign direct investment（FDI）in China has showed signs of slowing down.Experts observe that this can be attributed to the profound changes that have taken place in the global industrial chain along with the challenge of China losing its competitive edge in terms of labor, land and natural resources.
基金support from Strategic Priority Research Program of the Chinese Academy of Sciences, Grant No. XDA07030100Technology support program in the 11th Five-year Plan (2006BAA03B06)
文摘A study of the heat transfer about the heating surface of three commercial 300 MWe CFB boilers was conducted in this work. The heat transfer coefficients of the platen heating surface, the external heat exchanger (EHE) and cyclone separator were calculated according to the relative operation data at different boiler loads. Moreover, the heat transfer coefficient of the waterwall was calculated by heat balance of the hot circuit of the CFB boiler. With the boiler capacity increasing, the heat transfer coefficients of these heating surface increases, and the heat transfer coefficient of the water wall is higher than that of the platen heating surface. The heat transfer coefficient of the EHE is the highest in high boiler load, the heat transfer coefficient of the cyclone separator is the lowest. Because the fired coal is different from the design coal in No.1 boiler, the ash content of the fired coal is much lower than that of the design coal. The heat transfer coefficients which calculated with the operation data are lower than the previous design value and that is the reason why the bed temperature is rather high during the boiler operation in No.1 boiler.
