By using a cold CFB model, the effect of horizontal orifice areas of Loop Seal with side aeration air on operational property was studied in detail.The results showed that the horizontal orifice area had a great effec...By using a cold CFB model, the effect of horizontal orifice areas of Loop Seal with side aeration air on operational property was studied in detail.The results showed that the horizontal orifice area had a great effect on its stable operation and regulation of the recirculation rate.Under a certain range of the horizontal orifice area,the stable flow of solid particles through Loop Seal could be obtained and recirculation rate of solid particles could be well regulated and controlled through changing external aeration.The flow resistance properties across the horizontal orifice were given and an empirical equation of the pressure drop of horizontal orifice and solid circulating flow rate was proposed and a new orifice discharge coefficient was defined.The expression’s were in good agreement with the experimental data.展开更多
With the rapid development of circulating fluidized bed(CFB)technology in different fields,the disadvantages of conventional non-mechanical valves are becoming more apparent,and they are not suitable to be used in com...With the rapid development of circulating fluidized bed(CFB)technology in different fields,the disadvantages of conventional non-mechanical valves are becoming more apparent,and they are not suitable to be used in complex CFB systems.In this paper,a novel non-mechanical valve named the jet-control valve is presented which can avoid the fluidization of solid particles.The feasibility and performance characteristics of the new valve are investigated with a cold-model dual CFB.The results show that compared with the conventional non-mechanical valve,the jet-control valve can transfer solid particles steadily over a larger range,prevent artesian flow,and improve the leakage characteristics.The effects of the operating parameters and structural parameters on the minimum aeration velocity,solid flow rate,and maximum solid flow rate are studied.A two-valve model is proposed to explain the transport capacity of the valve for one jet pipe.A semi-theoretical expression is obtained based on the experimental data with a maximum deviation of 30%providing useful guide for scaling-up the design.展开更多
文摘By using a cold CFB model, the effect of horizontal orifice areas of Loop Seal with side aeration air on operational property was studied in detail.The results showed that the horizontal orifice area had a great effect on its stable operation and regulation of the recirculation rate.Under a certain range of the horizontal orifice area,the stable flow of solid particles through Loop Seal could be obtained and recirculation rate of solid particles could be well regulated and controlled through changing external aeration.The flow resistance properties across the horizontal orifice were given and an empirical equation of the pressure drop of horizontal orifice and solid circulating flow rate was proposed and a new orifice discharge coefficient was defined.The expression’s were in good agreement with the experimental data.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA07010300)
文摘With the rapid development of circulating fluidized bed(CFB)technology in different fields,the disadvantages of conventional non-mechanical valves are becoming more apparent,and they are not suitable to be used in complex CFB systems.In this paper,a novel non-mechanical valve named the jet-control valve is presented which can avoid the fluidization of solid particles.The feasibility and performance characteristics of the new valve are investigated with a cold-model dual CFB.The results show that compared with the conventional non-mechanical valve,the jet-control valve can transfer solid particles steadily over a larger range,prevent artesian flow,and improve the leakage characteristics.The effects of the operating parameters and structural parameters on the minimum aeration velocity,solid flow rate,and maximum solid flow rate are studied.A two-valve model is proposed to explain the transport capacity of the valve for one jet pipe.A semi-theoretical expression is obtained based on the experimental data with a maximum deviation of 30%providing useful guide for scaling-up the design.
