An investigation of performance of a conventional U type loop-seal for CFB reactors with side and bottom aerations

Experimental study of solid circulation rate and pressure distribution characteristics in a cold fluidized bed with an external heat exchanger in an municipal solid waste incinerator

“…In the other method, a measuring section was installed under the cyclone outlet and a butterfly valve was used at the bottom of the section. The volume of material could be measured by closing the valve in a certain time to calculate SCR 23 . The advantage of these methods was easy to be operated but contained the following shortcomings: (1) The internal operating status of the system was disturbed.…”

“…The volume of material could be measured by closing the valve in a certain time to calculate SCR. 23 The advantage of these methods was easy to be operated but contained the following shortcomings: (1) The internal operating status of the system was disturbed. (2) In actual operation, air flow was gradually decreased to 0 rather than instantaneously, which meant that the results were related to the measuring time and less stable.…”

“…16 In recent years, the cold experiment and numerical simulation research on CFB mainly focus on the riser [17][18][19][20][21] ; many test rigs and models do not design EHEs but simple loop seals. [22][23][24] Xiong has developed a new type of cold EHE text rig that is adjusted by pneumatic and an empirical formula for SCR, and pressure across an orifice has been proposed. 12 A new type of EHE connected with a loop seal in series for a CFB boiler has been proposed and developed by Wang, and it has been successfully applied in a 12 MWe bituminous-firing CFB boiler.…”

“…The latter mainly studies heat transfer characteristics by changing operating parameters such as fluidized air velocity, pressure, and particle diameter 16 . In recent years, the cold experiment and numerical simulation research on CFB mainly focus on the riser 17–21 ; many test rigs and models do not design EHEs but simple loop seals 22–24 . Xiong has developed a new type of cold EHE text rig that is adjusted by pneumatic and an empirical formula for SCR, and pressure across an orifice has been proposed 12 .…”

Avaliação Experimental Da Eficiência De Coleta De Um Ciclone Acoplado a Leito Fluidizado Circulante De Laboratório

“…A partir da análise de algumas contribuições presentes na literatura, destaca-se também que a taxa de aeração injetada na válvula loop-seal, dependendo das condições do balanço de pressão existente no circuito de fluidização, pode causar altas ou baixas variações na taxa de recirculação dos sólidos. Normalmente, quanto maior for a taxa de aeração usada, maior é a taxa de recirculação dos sólidos sob um mesmo diâmetro da partícula (Basu;Cheng, 2000;Basu;Butler, 2009;Li et al, 2014;Yukselenturk;Yilmaz, 2019;Chinsuwan;Somjun, 2020) Kim (2002), quando o diâmetro da partícula aumenta, torna-se necessário elevar a taxa de aeração para que a taxa de recirculação de sólidos permaneça constante. No entanto, a partir de um determinado valor de taxa de aeração, a taxa de recirculação de sólidos não se altera mais, como consequência de restrições impostas pelo balanço de pressão no sistema (Basu;Butler, 2009;Oliveira, 2019;Yukselenturk;Yilmaz, 2019).…”