Flue gases exhausted from thermal power plants contain more than 50% of the fuel thermal energy. In the present work, experimental investigation was carried out to study the utilization of thermal energy in flue gases...Flue gases exhausted from thermal power plants contain more than 50% of the fuel thermal energy. In the present work, experimental investigation was carried out to study the utilization of thermal energy in flue gases to enhance the performance of modified solar chimney consisting of Savonius wind rotor. A modified solar chimney model was designed and fabricated to carry out experimental measurement. The model consists of thermal energy conversion unit; Savonius wind rotor and a chimney. The thermal energy in the flue gas transfers to the air particles in the air channel across the absorber plate and results in upward air stream due to the buoyancy effect. With an 9 absorber area of 2.36 re＇and flue gas mass flow rate of0.18 kg/s, air velocity＇ of 4.1 m/s was achieved at the top of the thermal unit. Increasing the mass flow rate of the flue gas to 0.24 kg/s enhances the air velocity to be 4.6 m/s. The results have demonstrated the possibility＇ of utilizing the thermal energy in the waste flue gas to enhance the performance of a solar chimney and facilitate the continuous operation during the absence of the sun.展开更多
Experimental studies were carried out to find the difference of preheating characteristics of Datong coal in O_2/CO_2 and air atmospheres by a circulating fluidized bed. It is found that pulverized coal could be both ...Experimental studies were carried out to find the difference of preheating characteristics of Datong coal in O_2/CO_2 and air atmospheres by a circulating fluidized bed. It is found that pulverized coal could be both steadily preheated to above 800°C in the two different atmospheres, but the temperature distribution was more uniform along the riser in O_2/CO_2 atmosphere. During the preheating, the content of CO in the flue gas can reach 12.32% under the O_2/CO_2 atmosphere, far higher than that in air(5.94%). Simultaneously, the conversion rate of fixed carbon was higher in O_2/CO_2 atmosphere compared with that in air. It can be inferred the higher oxygen concentration and higher partial pressure of CO_2 have greatly accelerated the gasification reaction. The BET analysis indicated a number of large pores were transformed into micropores during the preheating progress, and the major contributors for overall pore volume of chars and specific surface area are the micro-pores and the mesopores with diameter ranging from 2 nm to 10 nm. The inner pore structure was more developed in O_2/CO_2 atmosphere.展开更多
OBJECTIVE： To design a combined dynamic inhalation device for testing the toxicity induced by moxa smoking. METHODS： The new apparatus （Patent No. 201120101911.5） includes air renewal and recycling systems, a gas ...OBJECTIVE： To design a combined dynamic inhalation device for testing the toxicity induced by moxa smoking. METHODS： The new apparatus （Patent No. 201120101911.5） includes air renewal and recycling systems, a gas generating device, a gas control unit, and a device to measure and control tem- perature and humidity. Sprague-dawley rats were tested for acute and sub-chronic toxicity after exposure to moxa-burning smoke.METHODS： The new apparatus （Patent No. 201120101911.5） includes air renewal and recycling systems, a gas generating device, a gas control unit, and a device to measure and control tem- perature and humidity. Sprague-dawley rats were tested for acute and sub-chronic toxicity after exposure to moxa-burning smoke.RESULTS： We found an LQ0 of 1.2× 10^4 mg/m^3 in the acute toxicity assays. In sub-chronic toxicity tests the organ coefficients studied showed no sig-nificant differences within rats groups of the same gender after treatment with moxa smoke or a month of recovery. However, mean gray degree of lung 70 heat shock protein （HSP70） was significantly elevated in the high dose group in comparison with the low dose group （P 〈 0.05）, mean gray degree, mean optical density, gross area of HSP70 in other organs and caspase-9 parameters showed no significant differences between groups.CONCLUSION： These results suggest that moxa smoke had no overt toxicity in rats. This work pro- vides evidence and reference for the design of dy- namic inhalation exposure systems.展开更多
文摘Flue gases exhausted from thermal power plants contain more than 50% of the fuel thermal energy. In the present work, experimental investigation was carried out to study the utilization of thermal energy in flue gases to enhance the performance of modified solar chimney consisting of Savonius wind rotor. A modified solar chimney model was designed and fabricated to carry out experimental measurement. The model consists of thermal energy conversion unit; Savonius wind rotor and a chimney. The thermal energy in the flue gas transfers to the air particles in the air channel across the absorber plate and results in upward air stream due to the buoyancy effect. With an 9 absorber area of 2.36 re＇and flue gas mass flow rate of0.18 kg/s, air velocity＇ of 4.1 m/s was achieved at the top of the thermal unit. Increasing the mass flow rate of the flue gas to 0.24 kg/s enhances the air velocity to be 4.6 m/s. The results have demonstrated the possibility＇ of utilizing the thermal energy in the waste flue gas to enhance the performance of a solar chimney and facilitate the continuous operation during the absence of the sun.
基金the supports of the National Natural Science Foundation of China (No. 51676187)
文摘Experimental studies were carried out to find the difference of preheating characteristics of Datong coal in O_2/CO_2 and air atmospheres by a circulating fluidized bed. It is found that pulverized coal could be both steadily preheated to above 800°C in the two different atmospheres, but the temperature distribution was more uniform along the riser in O_2/CO_2 atmosphere. During the preheating, the content of CO in the flue gas can reach 12.32% under the O_2/CO_2 atmosphere, far higher than that in air(5.94%). Simultaneously, the conversion rate of fixed carbon was higher in O_2/CO_2 atmosphere compared with that in air. It can be inferred the higher oxygen concentration and higher partial pressure of CO_2 have greatly accelerated the gasification reaction. The BET analysis indicated a number of large pores were transformed into micropores during the preheating progress, and the major contributors for overall pore volume of chars and specific surface area are the micro-pores and the mesopores with diameter ranging from 2 nm to 10 nm. The inner pore structure was more developed in O_2/CO_2 atmosphere.
基金Supported by the Study of Warming Effect of Moxibustion and its Principle(the Major National Basic Research Program of China,No.2009CB522904)the Study of Safety of Moxibustion Products Based on High Performance Liquid Chromatography-Mass Spectrometry in Metabonomics Technology(Hunan Graduate Student Innovation Fund,No.CX2010B342)
文摘OBJECTIVE： To design a combined dynamic inhalation device for testing the toxicity induced by moxa smoking. METHODS： The new apparatus （Patent No. 201120101911.5） includes air renewal and recycling systems, a gas generating device, a gas control unit, and a device to measure and control tem- perature and humidity. Sprague-dawley rats were tested for acute and sub-chronic toxicity after exposure to moxa-burning smoke.METHODS： The new apparatus （Patent No. 201120101911.5） includes air renewal and recycling systems, a gas generating device, a gas control unit, and a device to measure and control tem- perature and humidity. Sprague-dawley rats were tested for acute and sub-chronic toxicity after exposure to moxa-burning smoke.RESULTS： We found an LQ0 of 1.2× 10^4 mg/m^3 in the acute toxicity assays. In sub-chronic toxicity tests the organ coefficients studied showed no sig-nificant differences within rats groups of the same gender after treatment with moxa smoke or a month of recovery. However, mean gray degree of lung 70 heat shock protein （HSP70） was significantly elevated in the high dose group in comparison with the low dose group （P 〈 0.05）, mean gray degree, mean optical density, gross area of HSP70 in other organs and caspase-9 parameters showed no significant differences between groups.CONCLUSION： These results suggest that moxa smoke had no overt toxicity in rats. This work pro- vides evidence and reference for the design of dy- namic inhalation exposure systems.
