化学回热燃气轮机(chemically recuperated gas turbine,CRGT)是一种新型的高效低碳发电系统,适宜的设计参数有利于提升其循环性能。该文构建甲烷蒸汽重整化学回热燃气轮机循环系统模型,采用能量和㶲分析方法,探究关键参数的影响规律,并...化学回热燃气轮机(chemically recuperated gas turbine,CRGT)是一种新型的高效低碳发电系统,适宜的设计参数有利于提升其循环性能。该文构建甲烷蒸汽重整化学回热燃气轮机循环系统模型,采用能量和㶲分析方法,探究关键参数的影响规律,并与注蒸汽燃气轮机(steam injected gas turbine,STIG)循环进行对比。结果表明,在燃烧室出口温度为1100~1500℃、压比为10~30时,CRGT循环的发电效率比STIG循环高0.20~1.21个百分点,CRGT循环效率最高可达51.84%;燃烧室出口温度一定时,在低压比下,CRGT循环相比STIG循环的优势更为明显,压比一定时,燃烧室出口温度越高,效率提升得越多;与STIG循环相比,CRGT循环的冷却空气流量比降低0.5%~21.4%;CRGT循环的蒸汽产量低于STIG循环,余热将更多地转化为燃料中的化学能;CRGT循环的化学回热系统可回收65%~70%的排气㶲,排烟㶲损失低于STIG循环,化学回热系统㶲回收是循环效率提高的根本原因;甲烷蒸汽重整反应平衡温距每增大10℃,循环效率下降0.02~0.13个百分点,因此,有必要在化学回热反应器中实现高效的甲烷蒸汽重整反应。展开更多
Objective To investigate whether recuperating lung decoction （RLD） can modulate the composition of gut microbiota in rats during asthma treatment. Methods Fifteen Sprague-Dawley rats were divided randomly and equall...Objective To investigate whether recuperating lung decoction （RLD） can modulate the composition of gut microbiota in rats during asthma treatment. Methods Fifteen Sprague-Dawley rats were divided randomly and equally into control group, model group, dexamethasone （DEX） group, RLD medium-dose group, and RLD high-dose group. The asthma model was established in all groups, except for the control group. The rats in the DEX and RLD groups were treated orally with DEX and RLD, respectively. The rats in the control and model groups were treated orally with 0.9% saline. The intestinal bacterial communities were compared among groups using 16S rRNA gene amplification and 454 pyrosequencing. Results The microbial flora differed between the control and model groups, but the flora in the RLD groups was similar to that in the control group. No significant differences were observed between the RLD high-dose and medium-dose groups. RLD treatment resulted in an increase in the level beneficial bacteria in the gut, such as Loctobocillus and Bifidobocterium spp. Conclusion Oral administration of RLD increased the number of intestinal lactic acid-producing bacteria, such as Loctobocillus and Bifidobecterium, in asthma model rats.展开更多
Micro-combustion research works are motivated by development of portable, autonomous power generators such as the micro TPV with improvement in energy density over batteries. Heat recuperation is a technique which con...Micro-combustion research works are motivated by development of portable, autonomous power generators such as the micro TPV with improvement in energy density over batteries. Heat recuperation is a technique which contributes to better energy efficiency performance by recovering heat from the exhaust gas. In this paper, a numerical simulation is carried out to study the impact of incorporating recuperation on the performance of micro modular combustor system. The simulation results have been validated by experiments;achieving close agreement between simulated and experi-mental data. It was observed that the mean wall temperature, radiation power and emitter efficiency markedly improved with the incorporation of a heat recuperator. In addition, 25.8% enhancement of total radiation power and 30.6% emitter efficiency could be realized when the hydrogen air equivalence ratio was 0.9.展开更多
The performance of a marine gas turbine intercooler operating in wet condition was evaluated.The intercooler was a cross-flow plate-fin heat exchanger that used air and pure water as its working fluids at the hot and ...The performance of a marine gas turbine intercooler operating in wet condition was evaluated.The intercooler was a cross-flow plate-fin heat exchanger that used air and pure water as its working fluids at the hot and cold sides,respectively.The heat transfer performance and the water vapor condensation were investigated for a relative humidity of the inlet air that reached 100% during warship cruise.The condensation of the water vapors increased the hot side outlet temperature by a certain amount,which could in turn influence the performance of the compressor downstream.The condensate film thickness and the void fraction were calculated based on an annular two-phase flow model.It is found that water vapor condensation in hot flow channel increases the outlet temperature with a maximum value of 7.3℃ in the case of 100% relative humidity.The calculated liquid film thickness reaches a maximum value of 4μm,which indicates negligible thermal resistance to heat transfer.The results of liquid film thicknesses also provide a qualitative prediction of the diameter distribution of the condensate water droplets.展开更多
Two rotary furnaces of different construction model were used for the research work. One has no recuperating system and the second one has recuperating system. 60 kg of grey cast iron scrap was charged into each of th...Two rotary furnaces of different construction model were used for the research work. One has no recuperating system and the second one has recuperating system. 60 kg of grey cast iron scrap was charged into each of the furnaces at different time, after preheating the furnaces for 40 minutes. 0.5 kg graphite and 0.2 kg ferrosilicon were charged along with the scrap. The theoretical charge calculations have the composition of the melt as 4.0% carbon and 2.0% silicon. Charges in the furnaces were heated to obtain molten metal suitable for casting at 1350°C. The content of the furnaces was tapped three times after the attainment of 1350°C with 15 minutes interval between each tapping. Optical light emission spectrometer was used to analyze the resulting composition of the tapped samples. For type A furnace (without recuperation), sample A has its carbon and silicon contents reduced compared to expected value by 25.5% and 10.8%, sample B reduced by 29% and 13.4% and sample C reduced by 32% and 17.0% respectively. In Type B furnace (with recuperation), sample D has its carbon and silicon contents reduced by 12.2% and 7.3%, Sample E reduced by 13.0% and 8.0% and sample F reduced by 13.9% and 8.9% respectively.展开更多
Computational Fluid Dynamics(CFD)is used here to reduce pressure loss and improve heat exchange efficiency in the recuperator associated with a gas turbine.First,numerical simulations of the high-temperature and lowte...Computational Fluid Dynamics(CFD)is used here to reduce pressure loss and improve heat exchange efficiency in the recuperator associated with a gas turbine.First,numerical simulations of the high-temperature and lowtemperature channels are performed and,the calculated results are compared with experimental data(to verify the reliability of the numerical method).Second,the flow field structure of the low-temperature side channel is critically analyzed,leading to the conclusion that the flow velocity distribution in the low-temperature side channel is uneven,and its resistance is significantly higher than that in the high-temperature side.Therefore,five alternate structural schemes are proposed for the optimization of the low-temperature side.In particular,to reduce the flow velocity in the upper channel,the rib length of each channel at the inlet of the low-temperature side region is adjusted.The performances of the 5 schemes are compared,leading to the identification of the configuration able to guarantee a uniform flow rate and minimize the pressure drop.Finally,the heat transfer performance of the optimized recuperator structure is evaluated,and it is shown that the effectiveness of the recuperator is increased by 1.5%.展开更多
The results of computer simulation of segmented and cascaded thermoelectric generator modules are presented. That use of Bi2Te3-based materials as cold sections and PbTe-based materials as hot sections for two-section...The results of computer simulation of segmented and cascaded thermoelectric generator modules are presented. That use of Bi2Te3-based materials as cold sections and PbTe-based materials as hot sections for two-section modules in the temperature range 303-773 K, allows to multiply their efficiency by 1.28 as compared to single-section ones. Cascade structures are characterized by better efficiency and lesser output power compared with the sectional, although construction investigated modules are designed to the equal areas.展开更多
At the 40th Eureka World Invention Fair held in Brussels in 1991, the Ankan recuperator, a health product produced by the Sino-foreign funded Ankan Health Product Corporation, Ltd. in Tianjin, drew large crowd who suf...At the 40th Eureka World Invention Fair held in Brussels in 1991, the Ankan recuperator, a health product produced by the Sino-foreign funded Ankan Health Product Corporation, Ltd. in Tianjin, drew large crowd who suffered hypertension headaches, skin diseases and arthritis. One city council member joked, "I’ll try it once at the risk of my life." Surprised, within 30 minutes after being treated by the Ankan energy recuperator, the old man suffering from chronic neuritis raised his right arm. The pain was gone and an ulcer on the arm was basically healed. Many suffering from bronchitis, pulmonary emphasema, arthritis, shoulder pain and paralysis were cured. After inspection by the appraisal commission,展开更多
A SOFC （solid oxide fuel cell） cycle running on natural gas was integrated with a ST （steam turbine） cycle. The fuel is desulfurized and pre-reformed before entering the SOFC. A burner was used to combust the rema...A SOFC （solid oxide fuel cell） cycle running on natural gas was integrated with a ST （steam turbine） cycle. The fuel is desulfurized and pre-reformed before entering the SOFC. A burner was used to combust the remaining fuel after the SOFC stacks. The off-gases from the burner were used to produce steam in a HRSG （heat recovery steam generator）. The bottoming steam cycle was modeled with two configurations： （1） a simple single pressure level and （2） a dual pressure level with both a reheat and a pre-heater. The SOFC stacks in the present SOFC-ST hybrid cycles were not pressurized. The dual pressure configuration steam cycle combined with SOFC cycle （SOFC-ST） was new and has not been studied previously. In each of the configuration, a hybrid recuperator was used to recovery the remaining energy of the off-gases after the HRSG. Thus, four different plants system setups were compared to each other to reveal the most superior concept with respect to plant efficiency and power. It was found that in order to increase the plant efficiency considerably, it was enough to use a single pressure with a hybrid recuperator instead of a dual pressure Rankine cycle.展开更多
文摘化学回热燃气轮机(chemically recuperated gas turbine,CRGT)是一种新型的高效低碳发电系统,适宜的设计参数有利于提升其循环性能。该文构建甲烷蒸汽重整化学回热燃气轮机循环系统模型,采用能量和㶲分析方法,探究关键参数的影响规律,并与注蒸汽燃气轮机(steam injected gas turbine,STIG)循环进行对比。结果表明,在燃烧室出口温度为1100~1500℃、压比为10~30时,CRGT循环的发电效率比STIG循环高0.20~1.21个百分点,CRGT循环效率最高可达51.84%;燃烧室出口温度一定时,在低压比下,CRGT循环相比STIG循环的优势更为明显,压比一定时,燃烧室出口温度越高,效率提升得越多;与STIG循环相比,CRGT循环的冷却空气流量比降低0.5%~21.4%;CRGT循环的蒸汽产量低于STIG循环,余热将更多地转化为燃料中的化学能;CRGT循环的化学回热系统可回收65%~70%的排气㶲,排烟㶲损失低于STIG循环,化学回热系统㶲回收是循环效率提高的根本原因;甲烷蒸汽重整反应平衡温距每增大10℃,循环效率下降0.02~0.13个百分点,因此,有必要在化学回热反应器中实现高效的甲烷蒸汽重整反应。
基金supported by Young Scientists Fund of National Science Foundation of China[No.81302943,No.81302941]a project aimed at promoting the talents of young scientists in 2015[No.2015-QNYC-A-01]
文摘Objective To investigate whether recuperating lung decoction （RLD） can modulate the composition of gut microbiota in rats during asthma treatment. Methods Fifteen Sprague-Dawley rats were divided randomly and equally into control group, model group, dexamethasone （DEX） group, RLD medium-dose group, and RLD high-dose group. The asthma model was established in all groups, except for the control group. The rats in the DEX and RLD groups were treated orally with DEX and RLD, respectively. The rats in the control and model groups were treated orally with 0.9% saline. The intestinal bacterial communities were compared among groups using 16S rRNA gene amplification and 454 pyrosequencing. Results The microbial flora differed between the control and model groups, but the flora in the RLD groups was similar to that in the control group. No significant differences were observed between the RLD high-dose and medium-dose groups. RLD treatment resulted in an increase in the level beneficial bacteria in the gut, such as Loctobocillus and Bifidobocterium spp. Conclusion Oral administration of RLD increased the number of intestinal lactic acid-producing bacteria, such as Loctobocillus and Bifidobecterium, in asthma model rats.
文摘Micro-combustion research works are motivated by development of portable, autonomous power generators such as the micro TPV with improvement in energy density over batteries. Heat recuperation is a technique which contributes to better energy efficiency performance by recovering heat from the exhaust gas. In this paper, a numerical simulation is carried out to study the impact of incorporating recuperation on the performance of micro modular combustor system. The simulation results have been validated by experiments;achieving close agreement between simulated and experi-mental data. It was observed that the mean wall temperature, radiation power and emitter efficiency markedly improved with the incorporation of a heat recuperator. In addition, 25.8% enhancement of total radiation power and 30.6% emitter efficiency could be realized when the hydrogen air equivalence ratio was 0.9.
文摘The performance of a marine gas turbine intercooler operating in wet condition was evaluated.The intercooler was a cross-flow plate-fin heat exchanger that used air and pure water as its working fluids at the hot and cold sides,respectively.The heat transfer performance and the water vapor condensation were investigated for a relative humidity of the inlet air that reached 100% during warship cruise.The condensation of the water vapors increased the hot side outlet temperature by a certain amount,which could in turn influence the performance of the compressor downstream.The condensate film thickness and the void fraction were calculated based on an annular two-phase flow model.It is found that water vapor condensation in hot flow channel increases the outlet temperature with a maximum value of 7.3℃ in the case of 100% relative humidity.The calculated liquid film thickness reaches a maximum value of 4μm,which indicates negligible thermal resistance to heat transfer.The results of liquid film thicknesses also provide a qualitative prediction of the diameter distribution of the condensate water droplets.
文摘Two rotary furnaces of different construction model were used for the research work. One has no recuperating system and the second one has recuperating system. 60 kg of grey cast iron scrap was charged into each of the furnaces at different time, after preheating the furnaces for 40 minutes. 0.5 kg graphite and 0.2 kg ferrosilicon were charged along with the scrap. The theoretical charge calculations have the composition of the melt as 4.0% carbon and 2.0% silicon. Charges in the furnaces were heated to obtain molten metal suitable for casting at 1350°C. The content of the furnaces was tapped three times after the attainment of 1350°C with 15 minutes interval between each tapping. Optical light emission spectrometer was used to analyze the resulting composition of the tapped samples. For type A furnace (without recuperation), sample A has its carbon and silicon contents reduced compared to expected value by 25.5% and 10.8%, sample B reduced by 29% and 13.4% and sample C reduced by 32% and 17.0% respectively. In Type B furnace (with recuperation), sample D has its carbon and silicon contents reduced by 12.2% and 7.3%, Sample E reduced by 13.0% and 8.0% and sample F reduced by 13.9% and 8.9% respectively.
基金supported by the Scientific Problem Tackling Program of Science and Technology Commission of Shanghai Municipality(18DZ1202000)the Shanghai Local University Project“Research and Application of Key Technologies of New Efficient Micro Gas Turbine System”(No.19020500900).
文摘Computational Fluid Dynamics(CFD)is used here to reduce pressure loss and improve heat exchange efficiency in the recuperator associated with a gas turbine.First,numerical simulations of the high-temperature and lowtemperature channels are performed and,the calculated results are compared with experimental data(to verify the reliability of the numerical method).Second,the flow field structure of the low-temperature side channel is critically analyzed,leading to the conclusion that the flow velocity distribution in the low-temperature side channel is uneven,and its resistance is significantly higher than that in the high-temperature side.Therefore,five alternate structural schemes are proposed for the optimization of the low-temperature side.In particular,to reduce the flow velocity in the upper channel,the rib length of each channel at the inlet of the low-temperature side region is adjusted.The performances of the 5 schemes are compared,leading to the identification of the configuration able to guarantee a uniform flow rate and minimize the pressure drop.Finally,the heat transfer performance of the optimized recuperator structure is evaluated,and it is shown that the effectiveness of the recuperator is increased by 1.5%.
文摘The results of computer simulation of segmented and cascaded thermoelectric generator modules are presented. That use of Bi2Te3-based materials as cold sections and PbTe-based materials as hot sections for two-section modules in the temperature range 303-773 K, allows to multiply their efficiency by 1.28 as compared to single-section ones. Cascade structures are characterized by better efficiency and lesser output power compared with the sectional, although construction investigated modules are designed to the equal areas.
文摘At the 40th Eureka World Invention Fair held in Brussels in 1991, the Ankan recuperator, a health product produced by the Sino-foreign funded Ankan Health Product Corporation, Ltd. in Tianjin, drew large crowd who suffered hypertension headaches, skin diseases and arthritis. One city council member joked, "I’ll try it once at the risk of my life." Surprised, within 30 minutes after being treated by the Ankan energy recuperator, the old man suffering from chronic neuritis raised his right arm. The pain was gone and an ulcer on the arm was basically healed. Many suffering from bronchitis, pulmonary emphasema, arthritis, shoulder pain and paralysis were cured. After inspection by the appraisal commission,
文摘A SOFC （solid oxide fuel cell） cycle running on natural gas was integrated with a ST （steam turbine） cycle. The fuel is desulfurized and pre-reformed before entering the SOFC. A burner was used to combust the remaining fuel after the SOFC stacks. The off-gases from the burner were used to produce steam in a HRSG （heat recovery steam generator）. The bottoming steam cycle was modeled with two configurations： （1） a simple single pressure level and （2） a dual pressure level with both a reheat and a pre-heater. The SOFC stacks in the present SOFC-ST hybrid cycles were not pressurized. The dual pressure configuration steam cycle combined with SOFC cycle （SOFC-ST） was new and has not been studied previously. In each of the configuration, a hybrid recuperator was used to recovery the remaining energy of the off-gases after the HRSG. Thus, four different plants system setups were compared to each other to reveal the most superior concept with respect to plant efficiency and power. It was found that in order to increase the plant efficiency considerably, it was enough to use a single pressure with a hybrid recuperator instead of a dual pressure Rankine cycle.
