Different companies propose methods and apparatuses for
waste gases purification from SО2 using two-phase absorbent (CaCO3 suspension).The basic
problem of the carbonate absorbents is that its chemical reaction with SO2 leads to CO2 emission, which leads to similar ecological problems. The use of synthetic anionites
as adsorbents for gas purification from SO2 provides possibilities for
adsorbent regeneration. In a proposed method, the waste gas purification is
realized in two steps–physical absorption of SO2 with water in a
counter-current column and chemical adsorption of from the
water solution by synthetic anionite particles. The adsorbent regeneration is
made with NH4OH solution. The obtained (NH4)2SO3 (NH4HSO3) is used (after reaction with HNO3) for production of concentrated SO2 (gas) and NH4NO3 (solution). The proposed method permits
to be used the absorption columns, where are used the CaCO3 suspensions. In this paper, the efficiency
of the waste gases purification from SО2 is increased in an absorption-adsorption apparatus, where the absorption
is realized in co-current flows and the adsorption takes place in the flexible
adsorbent. For this is proposed a new absorption-adsorption column apparatus
with bubbling plates. A mathematical model of the absorption-adsorption process
is presented, too.
Cite this paper
Boyadjiev, C. and Boyadjiev, B. (2017). An Absorption-Adsorption Apparatus for Gases Purification from SO2 in Power Plants. Open Access Library Journal, 4, e3546. doi: http://dx.doi.org/10.4236/oalib.1103546.
Boyadjiev, Chr.,
Doichinova, M., Boyadjiev, B. and Popova-Krumova, P. (2016) Modeling of Column
Apparatus Processes. Springer-Verlag, Berlin Heidelberg.
Boyadjiev,
Chr. (2012) On the SO2 Problem of Solid Fuel Combustion. VIII All- Russian
Conference with International Participation “Solid Fuel Combustion”,
Novosibirsk, 13-16
November 2012.
Boyadjiev, Chr.,
Doichinova. M. and Popova, P. (2011) On the SO2 Problem in Power
Engineering. 1. Gas Absorption. 15th Workshop on Transport Phenomena in Two-Phase Flow. Sunny Beach Resort,
Bulgaria, 94-103.
Boyadjiev, Chr., Popova, P. and Doichinova, M. (2011) On
the SO2 Problem in Power Engineering. 2. Two-Phase Absorbents. 15th Workshop on Transport Phenomena
in Two-Phase Flow, Bulgaria, 104-115.
Pantofchieva, L. and Boyadjiev,
Chr. (1995) Adsorption of Sulphur Dioxide by Synthetic Anion Exchangers. Bulgarian Chemical Communications, 28,
780-794.
Boyadjiev, Chr., Pantofchieva, L. and Hristov, J. (2000)
Sulphur Dioxide Adsorption in a Fixed Bed of a Synthetic Anionite. Theoretical Foundations of Chemical Engineering, 34,
141-144. https://doi.org/10.1007/BF02757831
Hristov,
J., Boyadjiev, Chr. and Pantofchieva, L. (2000) Sulphur Dioxide Adsorption in a
Magnetically Stabilized Bed of a Synthetic Anionite. Theoretical Foundations of Chemical Engineering, 34, 439-443. https://doi.org/10.1007/BF02827387
Boyadjiev,
Chr., Boyadjiev, B., Doichinova, M. and Popova-Krumova, P. (2014) Method and
Apparatus for Gas Cleaning from Sulfur Dioxide. Bulgarian Patent Application No. 111398.
Boyadjiev,
Chr. and Boyadjiev, B. (2017) An Absorption-Adsorption Method for Gases Purification
from SO2 in Power Plants. Recent
Innovations in Chemical Engineering. (In
Press)