RU2251062C2 - Method for protecting heat exchange equipment against deposits and cleaning it and apparatus for performing the same - Google Patents

Abstract

FIELD: protection of heat exchange equipment against deposits and cleaning it, possibly cleaning inner surfaces of water heating boilers from deposits.

SUBSTANCE: method comprises steps of acting upon surface of steam and(or) water heating equipment by impulse magnetic field in order to create magnetostriction effect; simultaneously acting upon surfaces of ferromagnetic and non-ferromagnetic metal pipelines of equipment by means of impulse alternating magnetic field creating magnetostriction effect and created due to use of three-pole magnetic converter for successively shifting magnetic field. Apparatus for performing the method with use of impulse electromagnetic field creating magnetostriction effect includes magnetic converter arranged on surface of pipelines of ferromagnetic and non-ferromagnetic metals and providing magnetostriction effect due to action of impulse alternating magnetic field and successively shifting said field. Apparatus also includes pulse generator converting DC of power source by means of electronic switch and supplying pulse current to converter.

EFFECT: enhanced efficiency of magnetostriction effect at cleaning and preventing solid deposits in heat exchange equipment.

2 cl, 1 dwg

Description

The invention relates to the field of protection and cleaning of heat exchange equipment from deposits and can be used to protect and clean the internal heating surfaces of boilers from scale by exposure to electromagnetic fields.

A known method of cleaning the surface of heat exchange equipment [1] from a ferromagnetic material, which consists in the fact that the surface being cleaned is exposed to an alternating magnetic field, causing the effect of magnetostriction.

The disadvantage of this method is the restriction of its use only for cleaning surfaces, as well as the complexity of the technical implementation of the method.

Closest to the claimed invention is a method of protecting and cleaning the surface of ferromagnetic materials from deposits [2], which consists in exposing the ferromagnetic surface of a steam and / or hot-water and / or heat exchange equipment with a pulsed electromagnetic field to create a magnetostriction effect, while simultaneously magnetically treating the water on the equipment supply line.

This method of protecting and cleaning the surface of ferromagnetic materials from deposits cannot be used to prevent the formation of solid deposits in the presence of a large amount of iron salts in water, heat transfer equipment from non-ferromagnetic metals.

The technical task of the invention is to increase the efficiency of the magnetostrictive effect when cleaning and preventing solid deposits in heat exchangers.

This goal is achieved by the fact that the inventive method consists in exposing the surface of steam and / or water heating and / or heat exchange equipment to a pulsed electromagnetic field to create a magnetostriction effect. At the same time, magnetic treatment of water is carried out on the equipment supply pipe with a pulsed alternating magnetic field by means of a three-pole converter acting on the surface of pipelines made of ferromagnetic and non-ferromagnetic metals.

A method of protecting and cleaning heat-exchange equipment from deposits is to expose pipelines, solid deposits and salts in water to a bipolar alternating magnetic field that creates different tension values in materials, resulting in radial and longitudinal vibrations of the heating surface. Rotating magnetic vortex flows, enhancing the magnetostrictive effect, soften hard deposits, prevent the formation of new deposits and contribute to a more intensive leaching of softened deposits.

As a result of the influence of magnetic fields of different polarity on pipelines, solid deposits and salts in water, they are magnetized before saturation induction. Since pipelines, solid deposits and water salts have a different structure, their saturation induction is not the same. When the magnetic field decreases to residual induction, the difference between the values of the induction of solid deposits, water salts and pipelines increases even more and a magnetostrictive effect is created, that is, the expansion and contraction of the surfaces of pipelines and solid deposits, longitudinal and radial vibrations, and surface shifts.

As a result of this, the crystal lattice is destroyed by salts of solid deposits, their transformation into a paste-like mass or exfoliation at a water temperature above 70 ° C and an obstacle to the emergence of new crystallizations on the inner surfaces of pipelines. In addition, the action of a bipolar magnetic field creates rotating magnetic vortex flows, enhancing the magnetostrictive effect, which can destroy the crystal lattice of salts having a high iron content, and also contributes to a more intensive leaching of softened deposits in pipelines.

The proposed method of cleaning surfaces from deposits is carried out using a device for cleaning surfaces from deposits, including a power supply, a pulse generator, an electronic switch, a converter, a pulse regulator.

The drawing shows a device for implementing the proposed method.

The device contains a DC power supply 1, a pulse generator 2 connected to an electronic switch 3, a three-pole converter 4 mounted on the outer surface of the pipe 5, protected from solid deposits 6, and a regulator of the supplied pulses 7.

The device operates as follows.

The direct current of the power source 1 with the help of an electronic switch 3, controlled by the pulse generator 2, is converted into a pulse current and fed to a three-pole converter, which creates three magnetic fields of different polarity. As a result of exposure to a cleaned surface of a pulsed alternating magnetic field, it is magnetized until saturation is induced. As a result of the successive displacement of the pulsed alternating magnetic field, salts are crushed and dissolved in magnetized water, which significantly reduces their growth rate on the heating surface of heat exchangers and further protects equipment from ferromagnetic and non-ferromagnetic metals from deposits.

The use of this method and device for cleaning the surface from deposits allows you to operate heat transfer and heat power equipment from ferromagnetic and non-ferromagnetic metals while maintaining its technical and economic indicators within regulatory limits.

Sources of information

1. Patent No. 1542646, M. cl. B 087 B 7/02.

2. Patent No. 2167728, M. cl. B 08 B 7/02.

Claims (2)

1. A method of protecting and cleaning heat-exchange equipment from deposits, which consists in exposing the surface of steam and / or hot-water and / or heat-exchange equipment to a pulsed electromagnetic field to create a magnetostrictive effect and simultaneously affect the surface of pipelines made of ferromagnetic and non-ferromagnetic metals to create magnetostrictive effects pulsed alternating magnetic field by means of a three-pole magnetic transducer for sequential displacement of the magnetic la. 2. A device for protecting and cleaning heat-exchange equipment from deposits, in which they act on the surface of steam, and / or water-heating, and / or heat-exchange equipment with a pulsed electromagnetic field to create a magnetostrictive effect, equipped with a three-pole magnetic transducer mounted on the outer surface of the pipelines to simultaneously affect surface of pipelines made of ferromagnetic and non-ferromagnetic metals of equipment generating the effect of magnetostriction by pulsed variable magnes This field is also equipped with a pulse generator that converts direct current from a power source using an electronic switch and supplies a pulse current to the converter.