SU1315037A1 - Method of cleaning inner surfaces of tubes - Google Patents

Abstract

The invention relates to a technique for cleaning hollow articles from contamination and provides for an increase in the quality and productivity of cleaning. To do this, the inner wall of the product is subjected to a shock wave arising from an electrical discharge in a liquid, simultaneously at both open ends of the product. The power of the shock wave from both sides is chosen equal. 1 il. 00 eaten about

Description

The invention relates to a technique for cleaning the inner surface of products from contamination and can be used in various sectors of the national economy.

The purpose of the invention is to improve the quality and performance of cleaning.

The cleaning method consists in exposing the inner wall of the pipe to a shock wave that occurs during electrical discharge in a liquid,

The method is carried out in the following manner.

Into a pipe covered from inside with scale and immersed in a cuvette with technical water, pairwise located electrodes are introduced on both sides. With simultaneous electrical discharge, counterflows of fluid are created. The power allocated to each pair of electrodes is selected from the condition of minimum pumping, i.e. the mechanical motion of water, which occurs under the action of electrical discharges, transforms into the energy of shock waves arising from transverse flows in a pipe. The interelectrode gap is selected depending on the diameter of the pipe.

If the conditions for the hydrodynamic gate of the pipe are determined by the zone of the elastic action arising under the action of the electric discharge in the liquid.

The drawing shows schematically an installation operating according to the proposed method.

The installation consists of the treated pipe 1, covered inside with the scum of the 2nd placed in the bath 3, filled with technical water 4. Inside the heat exchanging pipe 1, a dielectric sleeve 5 with embedded electrodes 6, partially covered with insulation 7, is inserted on both sides. In the bath 3, pressure sensors 8 are located associated with unit 9 of recording equipment.

An example. Heat exchanger tube covered from the inside; and with a scale, 2.8 m long, immersed in a 4 m long bath filled with technical water. Coaxially arranged in pairs arranged electrodes are introduced from the two ends of the pipe. High-voltage impulse discharge in a liquid is carried out With the following parameters of the discharge circuit: the capacity of the accumulator battery C 1-12 µF initial voltage at the terminals Uo 30-50 kV; discharge conductivity inductance

tour L 5-800 μH-, the specific resistance of the working fluid p 1-100 Ohm / m: the area of the exposed part of the positive electrode - S rounding radius of the positive electrode rod g 2.0

mm;

length 17

interelectrode gap 21 mm.

Completely cleaning the pipe proceeds5

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five

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Dit at 170-200 bits. The condition of the absence of pumping is regulated by the power allocated to each pair of electrodes and recorded using a differential pressure sensor located at a distance of 2-3 diameters of the pipe from the electric discharge devices. The condition of the absence of pumping can be carried out by any other means of measurement (pressure sensors, flow sensors, etc.).

The power of the bits carried out from different sides of the pipe, even if the conditions for the absence of pumping are observed, is not always the same. This is due to the fact that the interelectrode gap in the pairs of electrodes 6 does not always coincide with absolute accuracy; the energy release in the discharge can also be shifted relative to the pipe axis.

The unevenness of scale along the pipe, the presence of curved sections also require consistency in each pair of electrodes 6.

In practice, the method is carried out in the following sequence.

Initially, the power of bits on both sides is chosen the same. After the first blows, the direction of pumping is determined, and from that side, the discharge energy is increased to keep pumping to a minimum, and further discharges are performed while maintaining this requirement. The power of the bits on both sides may be consistently increased or decreased. The maximum power limit of the bits is selected based on the condition that the heat exchange tube is strong.

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A laser discharge can be used as a source of shock waves.

The advantage of the proposed cleaning method is to increase the power of the shock wave by reducing the energy consumption for moving the liquid inside the pipe, resulting in

Improved cleaning quality and performance.

Claims (1)

The invention of the method of cleaning the inner surface of the pipe, which consists in creating in the cavity of the pipe from the opposite sides of the shock wave, characterized in that, in order to improve the quality and productivity of cleaning, a shock wave from opposite sides is created at the same time as. In this case, the power of the shock wave on opposite sides is chosen equal to.