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1SCIENTIFIC PROGRESS VOLUME 4 I ISSUE 1 I 2023 _ISSN: 2181-1601
Scientific Journal Impact Factor (SJIF 2022=5.016) Passport: http://sjifactor.com/passport.php?id=22257
ANALYSIS OF THE MAIN HYDRODYNAMIC REGULARITIES OF THE MICROBURNINGPROCESS IN ORDER TO IDENTIFY THE POSSIBILITIES
OF USING BIOGAS FROM CO2
A. A. Abdulazizov
Farg'ona politexnika instituti assistenti abdulloh.abdulazizov@ferpi.uz
ABSTRACT
This article presents the results of a study of the main hydrodynamic and mass transfer characteristics of a microbubble apparatus on model systems aimed at elucidating the possibility of using microbubble processes to conduct mass transfer processes between biogas and liquid.
Key words: microbubbling, hydrocarbons, perfluorocarbon, mass transfer, mass transfer. The mechanism of microbubble formation and the characteristics of membranes used for the microbubbing process
INTRODUCTION
To date, the process of membrane gas dispersion is mainly carried out on porous glass or ceramic membranes. The main characteristics of the membrane, which should be taken into account when studying the process of microburning, are the type and structure of the surface, porosity, as well as the shape and distribution of pore sizes. These characteristics depend both on the size of the microbubbles formed, and on the pressure and gas content in the membrane contactor.
LITERATURE ANALYSIS AND METHODOLOGY
The process of obtaining microbubbles with glass membranes is considered in the works . BarbaraEder, HeinzSchulz, Biogas plants in Europe // A practical handbook.-Springer, In these works, porous glass membranes of a special composition, the so-called SPG membranes, were used. As a starting material for the production of the SPG membrane, a mixture Na2CO3 , CaCO3 , MgO, H3B03 , As well as a mixture of Shirasu, which is the source Si02 and A1203. This mixture is melted at 1623 K for 3 hours. After cooling down to 1473 K a glass matrix is formed, consisting of Na2O — CaO — MgO — B203 A1203 — Si02, which is given the desired shape - flat or tubular.
Then, the samples are heat treated at 933-953 K for 20 hours. During this process, the phase separation of the homogeneous glass matrix into two phases occurs - one containing acid-soluble oxides Na20 — CaO — MgO — B203, other insoluble A1203— Si02. Next, the divided glass matrix is processed 0,5M solution of hydrochloric acid. As a result of the dissolution of oxides Na20 — CaO — MgO — B203 a porous membrane
SCIENTIFIC PROGRESS VOLUME 4 I ISSUE 1 I 2023 _ISSN: 2181-1601
Scientific Journal Impact Factor (SJIF 2022=5.016) Passport: http://sjifactor.com/passport.php?id=22257
structure is formed, the size of the resulting pores being dependent on the heat treatment conditions.
A detailed description of the manufacturing process of SPG membranes can be found in .
a) 6)
a) membrane with an average pore size of 3 b) a membrane with an average pore size Of
Figure 1.6 - Porous structure of glass SPG membranes
Figure 1. shows the surface images of glass SPG membranes.
As can be seen from the figures, SPG-membranes have sinuous cylindrical pores that form a three-dimensional working structure.
RESULTS
The porosity of such membranes is quite high and lies in the range 0.56-0.58, regardless of the pore size. The contact angle of the surface of the membrane with water is 230 - 270, which corresponds to the hydrophilic surface.
It can also be noted that on the surface of such membranes there are practically no ridges of roughness (which is explained by the method of their manufacture).
An important feature of SPG membranes is the narrow distribution of their pores in size. Thus, in Figure 1.7 (a), the integral curves of the pore size distribution for membranes with an average pore diameter of 43, 55, 64 and 85 nm are presented [14]. It can be seen that for all membranes the spread of pore diameters is about ± 20 nm. Figure 1.7 (b) shows the differential pore size distribution curve for a membrane with an average pore size of 3 um (a photograph of the surface of this membrane is presented in Figure 1.6 (a)). Here, one can also see a rather narrow distribution of the pore sizes-a spread of diameters of ± 1 gm.
DISCUSSION
As noted in [14-16], the size of the bubbles produced during microbubbotation strongly depends on the distribution of pore sizes. Thus, in [14], the dependence of the
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VOLUME 4 I ISSUE 1 I 2023 ISSN: 2181-1601
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diameters of the microbubbles formed on the diameter of the membrane pores was studied. As the liquid phase, 0.3 wt. % solution of sodium dodecyl sulfate, the flow rate of which in the membrane tube was 0.7 m/s.
iiMaMerp nop, MKM
a) Integral distribution curves for membranes with an average pore size of- (a) 43 nm, (b) 55 nm, (c) 64 nm, (d) 85 nm;
b) differential distribution curve for a membrane with an average pore size of 3 gm.
Figure 1.7 - Distribution of the pore size of SPG membranes
CONCLUSION
It was found that under these conditions, the size of the microbubbles formed linearly depends on the pore size and for all cases is approximately 8.6 times greater than the mean diameter of the membrane pores. This is also confirmed by the results of .
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