Affiliation:
1. Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Abstract
The main advantages and disadvantages of chemical and physical degassing of
liquids are considered. It was found that hydrodynamic cavitation should be
considered as an important alternative to acoustic cavitation, both in terms
of performance and, above all, in terms of energy saving. The processing of
two liquids - acidic condensate and model solution (solution of carbon
dioxide in distilled water) was performed. The dynamics of changes in the
content of dissolved carbonic acid depending on the duration of hydrodynamic
treatment in order to determine the optimal processing duration to achieve
the required degree of degassing are studied. Liquids were treated on a l
laboratory-scale plant developed as part of the implementation of the method
of discrete-pulse energy input into heterogeneous media, which creates
conditions for intensive growth of vapor bubbles and their removal. The pH
values were obtained and the concentrations of carbonic acid in the acidic
condensate and the model solution were calculated from the duration of their
processing. It was found that the main change in the pH of the model
solution and acidic condensate occurs approximately during the first two
minutes of processing. The increase in pH and, consequently, the decrease in
the dissolved carbonic acid content of both liquids for several days are
explained by the relaxation process during which carbon dioxide microbubbles
emerge from the liquid, which did not have time to leave the liquid. Data
from experimental studies of the dynamics of dissolved carbonic acid
content, together with theoretical studies of the growth of gaseous bubbles
in liquid and the evolution of a set of vapor bubbles to a critical value of
gas content can be used to optimize cavitation degassing processes and
justify optimal parameters of these processes. The proposed method of
degassing can be used for reagent-free neutralization of acid condensate,
which will improve the environment by reducing wastewater (chemically
contaminated neutralized condensate and waste water softeners) and rational
use of water resources by reducing the need for natural water. Also, the
proposed method of liquid degassing can be used in the food industry, in
particular, in the production of juices, beverages, vegetable oils, etc.
Publisher
National Library of Serbia
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