TITLE:
An Absorption-Adsorption Apparatus for Gases Purification from SO2 in Power Plants
AUTHORS:
Christo Boyadjiev, Boyan Boyadjiev
KEYWORDS:
Absorption, Adsorption, Gas Purification, SO2, Power Plant, Convection-Diffusion Model, Average Concentration Model
JOURNAL NAME:
Open Access Library Journal,
Vol.4 No.5,
May
3,
2017
ABSTRACT: 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 offrom 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.