SU946630A1 - Machine producing gas-liquid emulsion - Google Patents

Description

The invention relates to processes and apparatus of chemical technology, in particular to methods and devices for preparing gas-liquid emulsions and can be used primarily for the aeration of liquid lubricants, such as oils.

There is a known method of preparing a gas-liquid emulsion by capturing and ejecting a gas with a feed stream of liquid, followed by intensive mixing and crushing of bubbles. Devices that implement this method include spillways, spillways, nozzles, and similar accelerating devices for a jet of liquid that ejects gas.

At low speeds of the liquid jets, the ejection effect in these devices is insignificant.

. Higher speeds require a considerable amount of energy for driving the circulation pumps, which is not economically justified. The positive point in the emulsion preparation method under consideration is the relatively small utilized gas flow rate that is sucked by the liquid stream.

The closest to the invention in its technical essence and the achieved result is a method for preparing a gas-liquid emulsion by ejecting a gas with a stream of liquid taken from the inner side. the open surface of the rotating ring fluid, heating and then mixing the components of the emulsion.

A device for carrying out this method comprises a housing, a rotor placed in a housing made in the form of a hollow cup, a selection pipe 15 with a bent end located inside the rotor, a heater and devices for supplying liquid and gas D.

 The known method and device for

 20 preparating the gas-liquid emulsion allows to obtain high aeration efficiency at low energy costs only in narrow ranges of operating parameters. With an increase in the speed of rotation of the aerator, a sputtering regime begins, characterized by a low aeration efficiency. Increased viscosity of lubricants subjected to

30 aeration: or saturation (with another gas, such as HHSPTHUMJ, causes a large amount of energy to be consumed. The purpose of the invention is to increase economy, expand technological conditions and intensify processes by creating a positive temperature gradient of a rotating ring of liquid along the radius. Goal those are achieved in the method of preparing a gas-liquid bone emulsion by ejecting a gas with a stream of liquid taken from the inner side open surface of the rotating ring of heating fluid and subsequent mixing of the components of the emulsion create a positive temperature gradient along the radius of the rotating ring of liquid, and a positive temperature gradient is created by heating the outer cylindrical surface of the rotating liquid ring. A positive temperature gradient is created by cooling the inner cylindrical surface of the rotating ring of liquid. case placed in the case of the rotor, made in the form of a hollow glass, a selective pipe with a rubber bended end disposed inside the rotor, a heater and means for supplying liquid and gas sampling pipe is mounted for movement along radii sous rotor, and its hooked end directed towards the rotor rotation. In this case, the heater is placed inside the housing outside the rotor. Figure 1 shows the device, a longitudinal section; Fig. 2 shows a diagram for moving a sampling tube; Fig. 3 shows a scheme for ejecting a liquid with a stream of gas. A device for preparing a liquid emulsion consists of a housing 1, a rotor 2, made in the form of a hollow cup, an eccentric arranged pipe 3 in it with a curved end 4 facing the direction of rotation of the rotor (arrow A). A heater 5, an annular insert 6 with nodes 7 and 8 of an axial supply of liquid and gas, as well as an emulsion discharge pipe 3 are built into the housing 1. The rotor rests on the drive bearings (not shown) and on the peripheral surface of the stand b attached to the housing. Radial channels 9 are made inside the mouth of the rotor 2, transporting the initial fluid to the inner bore of the rotor 2. The leash 10 is fixed on the tube 3 and is designed to rotate it around its own axis in order to move the bent end 4 of the tube 3 along the radius of the rotor 2. Inside the rotating rotor 2, a liquid ring 11 is placed with an inner side open surface G. The thickness of the rotating liquid ring is h Rj-R; j. The device works as follows. Inside the rotating rotor 2, through the fluid supply unit 7 in the insert 6 and the radial channels 9, an initial medium, such as turbine oil, is supplied. A feed gas, such as nitrogen, is supplied through unit 8. Included in the heater is a heater 5 integrated in the housing. From the inner side open surface of the rotating ring of fluid (oil), the curved end of the tube 4 facing towards the direction of rotation of the rotor, i.e. (towards arrow A), the jet ejecting the gas is taken. Using a driver 10, the tube 3 is rotated around an axis, is set to such a specific position (for example, position D in Fig. 2), which, at a constant flow rate, uniquely determines both the thickness h of the rotating ring of the fluid and the radius Cd free the surface of the fluid, and the peripheral velocity of the fluid at the inlet of the tube, and the amount of flooding of the inlet end of the tube and, as a consequence, the degree of enrichment of the fluid with dispersed gas (due to the ejection of gas with a stream of the selected fluid). Through the heater 5, the thickness of the ring 11 creates a positive temperature gradient, which promotes the intensive formation of a gas-liquid emulsion. By changing the position of the bent end of the tube along the radius of the glass (position D, E, F in Fig. 2), iz. Changes in the frequency of rotation of the glass, the temperature gradient across the thickness of the rotating ring, the degree of flooding of the glass with liquid (by controlling the flow rate of the initial liquid), and the gas pressure create various combinations of parameters to obtain a gas-liquid emulsion of a wide range of concentrations and dispersions of gas inclusions. The technology of preparing a gas-liquid emulsion includes the following operations. The original fluid is preheated. The fluid is then introduced into the interior of the hollow rotating cup and creates a ring of fluid with an open inner side surface of rotation. Throughout the thickness of the rotating liquid ring, a positive temperature gradient is created by additional heating of the peripheral (outer) fluid layers. If at small circumferential speed of the xstakan (and the absence of a temperature gradient across the thickness of the layer) the liquid ring rotates like a quasi-solid body, then at elevated peripheral speeds and the presence of a temperature gradient across the thickness of the layer, the symmetric laminar motion becomes unstable, in a rotating ring waves appear and a nonstationary order of the vortex cords, the inner side (open) surface of the ring is covered by a swarm of asymmetric vortices and other secondary perturbing flows. It is from this open, perturbed, ruffled surface of the fast-rotating ring of fluid that a jet is taken into a partially submerged stationary tube, which additionally ejects the gas and then mixes it with the selected fluid, preparing such an emulsion. The parameters of the technological parameters of the operations of the proposed method depends on the type of fluid. h Pre-oil is heated (or cooled) to 35-45 ° C. Lower temperatures (increased viscosity) reduce the efficiency of the process, higher temperatures accelerate the oxidation of the oil (its aging). The liquid ring is rotated at a peripheral speed of 20-100 m / s. Low speeds do not provide a proper ejecting effect from the Mc1fly jet taken from the ring surface. Higher speeds lead to lower profitability (increased power loss) without noticeably improving the parameters of the Gas-Liquid Mixture. Through the thickness of the rotating ring a temperature difference is created. A smaller temperature difference is useless (there is no pronounced effect on the process of obtaining a gas-liquid emulsion) At higher temperature differences, intense oxidation of the oil begins, although the aeration process itself is improved. To obtain a rich foam oil (with a volumetric concentration of dispersed gas of 30-40% or more), the inlet end of the tube is flooded by only 5-10%. If it is necessary to obtain emulsion with a moderate gas content (5-10% by volume), the inlet end is flooded. tube is 45-70%. To obtain a highly dispersed gas-liquid emulsion (with the most representative bubble diameter d 50-100 µm), the mode parameters are selected in the next range of dimensionless complexes (obtained experiment gt dr P. / T-, lf O; - ((R, -R2 .) PSI P (.) .R. G. (- To obtain a coarse-dispersed gas-liquid emulsion (d 150-500 µm), the mode parameters of the method are selected from the following range of dimensionless complexes (experimentally obtained) P 0-0, 05;. (2 ) In expressions (1) and (2), g is the acceleration of the force of gravity; 6 is the width of the ring, R / (and Na. outer and inner radii of the liquid ring, 7 kinematic viscosity of the initial fluid, f - density of the initial fluid, angular velocity of rotation of the glass. Example. To the aerator - a device for preparing a gas-oil emulsion (Figs. 1 and 2) - dimensions R 300 mm, 200 mm supply heated to turbine oil brand Tp-22 GOST 9972-74 and atmospheric air at 20 C. The glass of the aerator is rotated with an angular velocity of I-1 / s; from the inner side open surface of the rotating oil ring with a thickness of h mm — a stream was taken into the mixing tube with an inner diameter D of 20 mm; the degree of flooding of the inlet of the tube is set equal to H%. At the outlet of the tube, an aerated oil is obtained with a volume concentration of f% and dispersion, characterized by the diameter of the most representative (in a row) bubble of d mm. The energy cost of preparing aerated oil is attributed to 1.0 ton / h of emulsion consumption. Table 1 shows the data characterizing the efficiency of aeration of oil by the proposed method. Example2. A gas-oil emulsion is prepared using the aerator described in Example 1, and an additional operation is performed: the outer surface of the rotating glass is heated to 45 ° C (i.e., higher than the temperature of the oil supplied to the aerator) into the body of the aerator. Table 2 summarizes the data characterizing the efficiency of aeration of the oil Tp-22 GOST 9972-74 by the proposed method. Creating a positive temperature gradient along the radius of the aerator beaker expands the operational capabilities of preparing a gas-liquid emulsion.

9466308

Table 1

500 500 235 235 125 125 63.5 63.5

22 7.4 43.5 14.6 9 38 10 41 60-80 70-90 220-400 250-450

60 50 40 30

: i :::: i :: :: ii :: i: I 1) 23 4

7, 5 2,5 7,5 2,5

40 40 25 25

50 50 25. 25

56 18.5 59 37 10 40 10 38

100 90 380 450 50 40 32 28

Claims (1)

; Table 2 Claim 1, a method for preparing a gas-jet zhektirGaT gas with a stream of liquid taken from the inner side is openly heated, to:; oGsmu: ° o yyyyy:: eG zk; :: ;; o: ty p sgrenig ss; . The POP.1 method is different. .ns: LSe- ±. . . 9- G 9 v / yy // yy / j 0 case, a tube selected in the form of a hollow cup with a curved end located inside the rotor, a heater and devices for supplying liquid and gas, characterized in that, in order to intensify the processes by creating along the radius of the rotating ring of liquid, a positive temperature gradient, the selection tube is mounted to move along the rotor radius, and its curved end is directed toward the rotation of the rotor. 5. The device according to claim 4, about tl and f .L: i: „. .R "", ™ e. ° g2 2 ":; g ;;, - er." Ze number fikfian ° ° USSR certificate | J 645690, cl. in 01 F 5/04, onySS K. l / 12T; 1 1g; g