L valve study through dimensionless numbers
L valve is a right angled, L shaped pipe applied to transfer solids between two vessels. This device uses gas injection and pipe geometry for controlling the flow of particulate solids. This kind of non-mechanical valve is used in processes such as pneumatic transport lines and circulating fluidized...
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| Autores principales: | , , |
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| Lenguaje: | English |
| Publicado: |
Universidad de Tarapacá.
2016
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| Materias: | |
| Acceso en línea: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-33052016000500008 |
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| Sumario: | L valve is a right angled, L shaped pipe applied to transfer solids between two vessels. This device uses gas injection and pipe geometry for controlling the flow of particulate solids. This kind of non-mechanical valve is used in processes such as pneumatic transport lines and circulating fluidized beds. This study aims to develop a new correlation to the solids mass flow rate through dimensional analysis, experimental data and equation fitting. An accurately way to estimate the flow of solids makes easier the design and control of the valve. This study is limited to the influence of L valve geometry, gas injection and particle properties. A test section was built, comprising two valve diameters (acrylic pipes of 34 and 70 mm). Glass beads were used as solids (Sauter diameter 0.8 mm, bulk density 1,580 kg/m³, group D of Geldart classification) and were conveyed by air. Dimensionless numbers were calculated (by Buckingham PI theorem) from the variables of the process, then an experimental program was done. Based on experimental data, π1, π2 and π3 values were calculated for each test. Mass flux is one variable of π1. Then a chart was created and a best fit equation was found based on π1, π2 and π3. Dimensionless numbers were replaced by their equations calculated by Buckingham PI Theorem and solids mass flux can be isolated. |
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