Mel’niсk V. N., Trivailo M.S., Karachun V.V.

National Technical University of Ukraine «KPI»

THE gas-distributional insertion

The utility model refers to microbiology, notably to the devices for aeration of working fluid environments in reactors and may be used for cultivation of microorganisms and cells at microbiological industry.

It is known the device for aeration of liquid (DAL) in reactors, which contains vertical tube for supplying of aerating gas and radial joined to tubes in its bottom barbotage tubes with holes in their walls for output of gas into liquid, and also incline placed above the barbotage tubes in several layers plates (A.c. of USSR № 1735354, С12 М1/04, 1992)

The fault of this DAL consists in complication of construction in consequence of presence of plates in it with the necessary mounting and in flapping (coalescence) of bubbles of gas by passing the plates by them, thet prevents the mass-exchange, and thus, the growth of productivity of reactor.

It is known the DAL which contains vertical conduit with collector in the bottom and radial joined to the collector tubes with longitudinal slits (slots) and plugs on peripheral ends, and also the gas-distributional cylindrical inserts in the form of rods with circular cavity situated above the slits in tubes (A.c. of USSR № 1712400, С12 М1/04, 1992).

This DAL is the nearest to the utility model because of its technical essence and reaching effect and is accepted as the nearest analogue.

Another fault of the known DAL consists in absence opportunity to regulate the process of mixing.

The mentioned faults slow down the growth of microorganisms that leads to decrease of productivity.

In the basis of the utility model it is putted the problem of improvement of DAL, in which by means of changing the shape of gas-distributional inserts and introduction in the construction extra elements, the growth of intensity of mixing and possibility to regulate it increases, that accelerates the growth of microorganisms and leads to the growth of productivity.

The putted problem is solved by that in the DAL which contains vertical conduit with collector in the bottom and radial joined to the collector tubes with longitudinal slits and plugs on the peripheral ends, and also the gas-distributional cylindrical insertions placed above the slits in tubes, according to the utility model the new is that insertions are carried out in the form of spiral.

The gas-distributional insertions in the form of cylindrical spirals in comparison to the nearest analogue increase the number of ways of exit of gas from the slip of tubes, that increases the turbulization of gas and culture fluid, in consequence of what the mass-exchange grows up, and thus the productivity.

The DAL differs by that one ends of spirals are joined to the plugs, and other ends are connected among themselves by the grove (or washer with central threaded slot), which is screwed on a foreseen for this aim passed through the butt end wall of the collector screw.

The indicated distinct features ensure the possibility to regulate the intensity of dividing gas stream, that additionally leads to the growth of productivity, so far as removes the necessity of changing the DAL at changing the culture fluid or other technological parameters, for example, temperature.

On the fig. 1, а it is schematically shown the proposed DAL in the cross-cut; on the fig.1, b – the bottom view; on the fig.1, c – the cross-cut A-A on the fig.1, а; on the fig.1, d – the variant of implementation of DAL by fig.1, а.

The DAL contains vertical conduit 1 with collector 2 in the bottom and radial joined to the collector tubes 3 with longitudinal slits 4 and plugs 5 on peripheral ends, and also the gas-distributional cylindrical insertions in the form of spiral 6 with the air gap between spires 7 placed above the slits of tubes. Tubes 3 are evenly located circular in horizontal plate, and free located in them spirals 6 are pressed to the slits 4 by screws 8. Except the inner, spirals can have outer location (not shown), that simplifies the purification of DAL. The size of slits 7 between the spires of spirals 6 accepts in limits of 0,1 – 0,2of diameter of spires, and outer diameter of spirals can be the same with inner diameter of tubes 3.

At inner placing spirals 6 can be joined by one end to the plugs 5 (fig.1, d), and by another ends – connected among themselves by grove 9, which is screwed on the foreseen for this aid passed through the bottom of collector screw 10. Such a kind of fastening of spirals let to change air gap 7 between spires of spirals 6 and to tune the DAL on the optimal behavior because of necessity of changing the parameters of aeration by means of screwing up the screw.

The DAL works in next way.

The compressed gas (air) is supplying by means of conduit 1, from where it comes to the tubes 4 and spirals 6 through the collector 2, and through the slits 4, dividing, it is ejecting to aerating liquid, turbulates it and saturates, for example, necessary for vital activity of microorganisms, by oxygen.

Hereby, located outer the spirals 6 gas, as in the nearest analogue, is ejecting through the slits 4 in touching to the spires straights 11 (fig.1, c), and from cavity of spirals – in radial straight 12, that is absent in the nearest analogue. The created by spirals 6 supplementary straight 12 of motion of gas, increases the intensity of its dividing and the time of contact with aerating liquid and rises the interphase surface, that increases the intensity of mass-exchange in gas-fluid environment and leads to the growth of productivity. The available opportunity, that realizes by changing the air gaps 7 between spires of spirals, by means of screwing up (screwing off) of the screw (fig. 1, d), to regulate the mixing facilitates the growth of productivity.