- Thursday, May 1, 2003
- Published at:Process Safety and Environmental Protection, Volume 81, Issue 3, May 2003, Pages 210-216
- The performance of a new type of gas absorber was investigated. Laboratory absorption experiments on different absorption systems such as ethyl–thiol, acetone–water, ethanol–water, methylene chloride–festo oil and H2S–NaOH were carried out under reduced air pressure. The absorption rate was investigated as a function of geometrical parameters and construction materials. The possibility of installating more than one gas absorber on the same absorption tank was investigated as well. It has been applied successfully in industry. In general, this unit improves the performance of existing absorption columns by absorbing 25–30% of the released gases or vapors, and this value may be higher in the case of chemisorption, which leads to higher environmental protection. Moreover, a ‘jet absorber’ has a simple structure, small size with low investment and operation costs; it is suggested that it is used to cope with any sudden increase of gas or vapor emission.
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- Friday, October 1, 1999
- Published at:Chemical Engineering Research and Design. Vol. 77, no. A7, pp. 627-32. Oct. 1999
- New types of vibrating valve trays with textile valves were investigated to determine their optimal construction. Hydrodynamic and mass transfer measurements were carried out in a pilot plant with different vibrating valve and conventional valve trays under identical experimental conditions. The total tray pressure drop column efficiency, volumetric mass transfer coefficient and pressure drop per theoretical tray were measured and compared. The high mass transfer rate, low investment and operating costs, corrosion and heat resistance make the vibrating valve trays attractive for gas absorption and air cleaning in environmental protection.
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- Wednesday, January 1, 1997
- Published at:Chemical Engineering Research & Design, Vol.75, No.6, 620-624, 1997
- Hydrodynamic parameters were measured in a Nutter valve tray simulation column. The clear liquid height was determined in different operating regimes (foam + mixed and spray regimes) and new formulas were developed as functions of weir height and flow parameter. New correlations were developed, as functions of geometrical and operating parameters, for the total liquid hold-up and the relative froth density.
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- Sunday, January 1, 1995
- Published at:Trans I Chem E., 73, Part A, 392-397. (1995)
- The influence of weeping on the mass transfer of different industrial plates was investigated in a 400 mm inside diameter column equipped with 4 plates. The absorption of acetone from air to tap water was measured on vibrating valve, Nutter valve, Glitch valve, sieve and turbogrid plates with varied weir heights. The weeping was determined by a direct method. The tray efficiency (η) of the investigated plates decreased 1-5% with the increase of weeping rate, while it decreased 10-25% with the increase of weir height. Mass transfer characteristics of the above plates, namely recovery efficiency (E), volumetric mass transfer coefficient (KGa) and pressure drop related to one theoretical plate (Δp/Nth) were measured and compared.
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- Tuesday, January 1, 1991
- Published at:Trans. I. Chem. E. 69, Part A., p.287-294 (1991).
- A new general expression is developed for the hydrodynamic design of sieve plates, namely for the calculation of total pressure drop and its components. The division of total pressure drop into part pressure drops is theoretically based on the momentum theory and fundamental laws of fluid flow. Applying and developing the results of Haq3 and Davy and Haselden it was established: (1) The partial pressure drops, except that of wet plate pressure drop, are practically independent of surface tension, liquid density and viscosity. (2) The wet plate pressure drop is a parabolic function of gas velocity. It is practically independent of liquid density and viscosity in wide range, but strongly depends on surface tension. In conclusion a general expression is presented for total pressure drop of sieve plates, which is theoretically established, valid in all the three foaming regimes and expresses the influence of surface tension.
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