SU1430082A1 - Method and apparatus for substituting gas in liquids - Google Patents

Abstract

The invention relates to methods and devices for directing the mass exchange between liquids and gases, can be used in chemical, oil refining and metal processing branches and agriculture and allows to increase the productivity and efficiency of the process and reduce the unproductive consumption of unsubstituted gas. Liquids are preliminarily deep degassing until the maximum concentration of gas dissolved in them is reached, and then they are filled with a replacement gas under the influence of acoustic oscillations, which are introduced into the liquid at a frequency close to the natural frequency of the bubbles of the replacement gas. A device for carrying out the method includes a saturating column with a pressure safety valve, a gas distributing device, a degasser connected by means of a piping with a pressurized column, a source of acoustic oscillations with a generator feeding it, mounted inside the column. 2 sec. and 2 z. p. f-ly, 1 ill. x (L

Description

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. The invention relates to methods and devices for directing the impact on the mass exchange between liquids and gases and can be used in chemical, oil refining and metal processing industries and agriculture. The purpose of the invention is to reduce the concentration of the gas to be replaced in liquids, to increase the efficiency of the process. by reducing the unproductive consumption of the replacement gas.

Example. Replacing air, dissolved in water, with oxygen (for redseeding treatment of seeds).

Water is degassed (for example, using a cylindrical ibrator on the pipe), reducing the concentration of air dissolved in it from 0.025 to 0.002-0.0015. Then water is saturated, whereby oxygen gas of 2.4–2 cm in diameter (natural frequencies of 26–28 kHz) is introduced into the gas distribution device. Bubbles of this size can be obtained by blowing oxygen into the water through a membrane of finely porous material. At the same time, acoustic oscillations with a frequency of 27 kHz are introduced into the water, under the influence of which the bubbles undergo intense oscillations and dissolve, saturating the water contained in them with oxygen to a concentration of 0.026-0.035 cMVMJi.

To prevent water from degassing, a stable film is formed on its free surface from a lighter liquid, having a density less than the density of the treated liquid and immiscible with it (for example, from oil). It spreads over the free surface of the treated fluid and prevents it from re-degassing after saturation.

The drawing shows a schematic diagram of a device that implements a method for replacing gas in liquids.

The device includes a degasser 1, for example, an ultrasonic saturating column 2, at the bottom of which a source of 3 acoustic signals is mounted (for example, an ultrasonic vibrator), powered by a generator 4, the gas distribution device 5 is provided in the lower part of the column in the form of a ring collector with opening

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ti, connected by a line with a gas battery 6 pressure. A container 7 for film-forming liquid with a supply pipe and a shut-off valve 8, a safety valve 9 for relieving overpressure and a drain line with a shut-off valve 10 connected to the container 11 for storing all liquid; including a gas accumulator 12 pressure.

The device works as follows.

First, degassing is carried out, for which the liquid to be processed through the inlet pipe enters the degasser 1, where it is released from the gas dissolved in it. Pre-degassing of the liquid allows to minimize the concentration of the gas dissolved in it and thereby creates conditions for deeper and more intense saturation.

After de-stabilization, saturation is carried out, for which the liquid from the degasser 1 enters the lower part of the supporting column 8 via the connecting pipeline. Simultaneously, from the gas accumulator 6 of the pressure, bubbles of the replacement gas are introduced into it from the gas accumulator 6 by the action of acoustic waves emitted by the source of the 3 oscillations, they make intense oscillatory movements at the resonant frequency. When bubbles of a replacement gas are introduced into a degassed liquid as a result of directional diffusion, they dissolve (the gas diffuses into the underflowing liquid (it’s liquid), greatly accelerated when acoustic oscillations are superimposed due to a number of specific non-linear effects (bubble oscillations micro flows) Ny oscillation mode, characterized by an increase in their amplitude with a minimum consumption of external energy and max, the maximum efficiency of acoustic effects, further accelerates mass transfer As a result, the bubbles, almost completely dissolved (which reduces the flow rate of the replacement gas by several times), saturate the liquid contained in them with gas.

To prevent gas from escaping from a saturated liquid, a stable film is formed on its free surface from a lighter than processed liquid that is immiscible with it. To do this, smoothly adjusting the flow of saturated liquid in the drain line by the shut-off valve 10, achieve lifting and establishing its free surface on the visually controlled through the viewing slot (not shown in the figure) a little higher than the level of the drain line. After that, opening the locking collar 8, the expiration of the film-forming liquid from the tank 7, which spreads over the free surface of the saturated

with a significant reduction in unproductive consumption of saturating gas; reducing the residual concentration of the substituted gas in the liquid.

Claims (4)

1. A method of replacing gas in liquids by enriching them with another gas, characterized in that, in order to reduce the concentration of the gas to be replaced in liquids, to increase the efficiency of the process by reducing the unproductive consumption of the replacement gas, the liquids are preliminarily deep degassed before achieving the lowest possible concentration of gas dissolved in them. liquid, forms an insulating film. 20 then saturate with replacement gas After this, the valve 8 is closed. If a number of undissolved bubbles arise as a result of coalescence, they float up and, after breaking through the insulating film, transfer to a gas cushion, the pressure in which is regulated by a safety valve 9. The use of a liquid insulating film also allows saturation without superfluous replacement gas in almost any the atmosphere. Then, the saturated liquid flows through the drain line to the consumer or to the storage tank 111 for temporary storage, which is equipped with a charge system with a replacement gas from the pressure accumulator 12 to prevent liquid degassing. The boost of the container 11 may be replaced by an insulating surface film. The generator 4, having a smooth adjustment of power and frequency, increases the versatility of the device, i.e. provides processing of various liquids with various physicists; Mechanical properties -. When using the invention, it is possible to saturate liquids with a gas that has a lower solubility in them than the substituted gas; increasing the productivity of the replacement process; efficiency improvement process 0 then saturated with replacement gas five 0 five 0 five 0 under the influence of acoustic oscillations, the latter being introduced into the liquid at a frequency close to the natural frequency of oscillations of the bubbles of the replacement gas. 2. A method according to claim 1, wherein and in order to prevent the replacement gas from escaping from the saturated liquid, its free surface is separated from the gas flow by a film from a lighter than processable one and not fluid mixed with it. 3. A device for replacing gas in liquids, including a saturating column with a pressure safety valve and located in the bottom parts of it by a gas distribution device connected to the gas pressure accumulator by means of a gas line, which, in order to increase the efficiency of the process, is equipped with a degasser connected by a connecting pipe with a saturating column and a source of acoustic oscillations with its generator, installed inside saturation-drinking columns. 4. A device according to claim 3, characterized in that the saturating column is provided with a container for a film-forming liquid with a supply pipe and a shut-off valve.