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Neutralization of acidic condensate obtained after combustion of natural gas using the hydrodynamic cavitation method. Features and efficiency of the process

Nedbailo Anna, Ivanitsky Georgiy, Tselen Bogdan, Obodovych Oleksandr, Radchenko Nataliya, Gozhenko Liubov

Journal of New Technologies in Environmental Science

2024

Vol. 8, nr 1

12--17

This paper examines the question of the efficiency of neutralization of acidic liquid media by the method of hydrodynamic cavitation. This method was proposed for the neutralization of acidic condensate obtained as a result of the combustion of natural gas at thermal power plants and allows to significantly reduce the acidity of the solution without adding chemical reagents with moderate energy consumption due to the removal of dissolved gases. If we consider acidic condensate, then it contains up to 70 mg/l of CO2, when the solubility of this gas at normal temperature in water reaches 0.47 mg/l. The majority of this gas is present in the form of bubbles with a radius of less than 5 μm. Their removal leads to a change in the balance of carbonic acid in the system, which affects the acidity of the solution. To evaluate the effectiveness of removing soluble gases from a liquid by the method of hydrodynamic cavitation, studies of the effectiveness of degassing of a model substance (CO2 solution in distilled water) were conducted. The rotor-pulsation apparatus was chosen as the cavitation device in the installation. As a result of theoretical studies, the minimum size of the CO2 bubble was determined, that can be removed from the liquid with the applied processing parameters, and the total volume of carbon dioxide removed during processing and the dynamics of changes in the volume of gas during storage over time were determined.

Discrete-Pulsed Energy Input Based Method for Neutralisation of the Acidic Condensate

Tselen Bogdan, Ivanitsky Georgiy, Obodovych Oleksandr, Radchenko Nataliya, Nedbailo Anna, Gozhenko Liubov

Rocznik Ochrona Środowiska

2023

Tom 25

215--221

The article's authors analysed the most perspective and widely known methods of neutralising the acidic condensate, which is a by-product of natural gas combustion. Among them, the hydrodynamic cavitation method was the most effective. In this regard, it was proposed to improve this method by using the method of discrete-pulsed energy input, which involves neutralisation due to the degassing process. Based on the mathematical model of the bubble ensemble dynamics, a numerical simulation of the formation and growth of vapour-gas bubbles in the process of cavitation boiling of condensate was carried out. Also, an analytical study of the evolution of the vapour-gas bubble population and changes in the current vapour content of the condensate during its boiling was investigated under different values of the initial size of gas micronuclei. The results of the experimental study also confirmed the effectiveness of this method and showed that almost complete removal of carbonic acid from condensate occurs during the first two minutes of processing. That is evidenced by the increased pH values of condensate, which corresponds to the range of permissible pH values of distilled water. Therefore, the carbonic acid in the condensate is absent. Using this method will significantly reduce the environmental effect and the amount of harmful emissions.