RU2108150C1 - Method for cleaning of synthetic organic sorbents and plant for its embodiment - Google Patents

Abstract

FIELD: cleaning of synthetic sorbents, for instance, in water treatment. SUBSTANCE: method provides for treatment of aqueous suspension of sorbent in acoustic field of low-frequency sound oscillations with subsequent purification of flow of aqueous suspension in ultrasonic field. The plant for embodiment of the offered method has two successively connected chambers: pretreatment chamber in acoustic field produced by hydrodynamic radiators and chamber for treatment in ultrasonic field produced by magnetostrictive converters connected to oscillator. EFFECT: higher efficiency. 5 cl, 1 dwg

Description

 The proposed invention relates to the field of purification of synthetic organic sorbents, in particular used in the operation of water treatment plants in thermal power plants, and can be used to purify ion exchangers from impurities such as iron oxides and hydroxides, oils, oil products, organic substances and other impurities that accumulate on the surface grains of ion exchangers and leading to a decrease in their exchange capacity, deterioration of the quality of the filtrate and other undesirable consequences.

 A known method of purification of anion exchangers used in water treatment, by washing them with alkali and water (patent RU N 2056943, B 01 J 41/12, 1996).

 The disadvantage of this method is the use of chemicals in the process.

 A known method of cleaning the sorbent in a filter column, including washing it with water, while the water is supplied by jets created by hydrodynamic activators (patent RU N 2060822, B 01 J 47/02, 1996).

 The disadvantage of this method is the high consumption of water and the insufficient degree of purification of the sorbent.

A known method of purification of synthetic organic ion exchangers by treating them with ultrasound in water at t = 35 - 50 ^o C (patent RU N 2006286, B 01 J 49/00, 1994).

 This method allows cleaning without the use of chemical reagents, however, if it is necessary to clean large quantities of ion exchangers, the degree of purification is insufficient.

 A known method and installation for removing contaminants from an ion-exchange resin, providing before exposure to the resin suspension with ultrasound to add a dispersant to it, contributing to the formation of colloids, for example, sodium hexametaphosphate or sulfuric acid (application EPO N 0052453, B 01 J 49/00, 1982).

 The known method allows to obtain a high degree of purification and improve separation from the purified product, however, it is not free from the use of chemicals in the process.

 The closest in technical essence and the achieved result is a method of purifying synthetic organic ion exchangers by treating a sorbent suspension with water with ultrasound and an apparatus containing an ultrasound generator, a container for contaminated material, an ultrasonic treatment chamber with built-in magnetostrictive transducers connected to the generator, and equipped with an input and output nozzles, and a washing cylinder, from which contaminants are carried out by a counter flow of water (Blyankman L.M. and filtering materials. - M.: Energoizdat, 1981, pp. 70 - 74).

 The disadvantage of the above method and installation is that when cleaning heavily contaminated materials to obtain the desired degree of purification, there is a need for multiple cleaning, for which it is possible to change the direction of flow of the suspension to be cleaned.

 The objective of the present invention is to develop a method and an installation that allows to obtain a high degree of purification of the sorbent in a stream with high productivity without the need for multiple repetitions of operations and without the use of chemical reagents during cleaning.

 The problem is solved by the described method of purification of synthetic organic sorbents, including pre-treatment of an aqueous suspension of the sorbent in the zone of the acoustic field of low-frequency sound vibrations created by the supply of water through hydrodynamic emitters of acoustic vibrations during sparging (dispersion) of air into the aqueous suspension of the sorbent, in the subsequent processing of the flow of the aqueous suspension in the ultrasound field.

 In this case, it is preferable to supply water through hydrodynamic radiation under pressure.

The problem is solved by the described installation for implementing the method containing the inlet nozzle for the sorbent, a pre-treatment chamber, equipped with at least two hydrodynamic emitters installed at an angle to each other, preferably equal to 90 ^° for ease of installation, each of the emitters is provided with a nozzle for feeding water and a fitting for air supply, an ultrasonic treatment chamber with built-in magnetostrictive transducers connected to the generator, and an output nozzle.

 The ultrasonic treatment chamber is mainly located vertically above and coaxially with the pre-treatment chamber. However, in principle, another arrangement of the aforementioned cameras is possible.

 The following is an example implementation of the method according to the invention and a preferred installation for its implementation.

 Example.

The synthetic organic sorbent (ion exchange resin) of the KU-2-8 grade was subjected to purification in an amount of 14 m ³ . Before cleaning, the resin was operated for 5 years in a mechanical filter at the stage of Na - cationation in industrial conditions of a thermal power plant.

 Purification of the sorbent was carried out on the installation of cleaning synthetic organic sorbents, a diagram of one of the options of which is shown in the drawing.

 The installation contains: 1 - an ultrasonic treatment chamber; 2 - inlet pipe; 3 - outlet pipe; 4 - magnetostrictive transducer connected to a generator; 5 - hydrodynamic emitter; 6 - air supply fitting; 7 - fitting water supply hydrodynamic emitter; 8 - viewing window; 9 - pressure gauge; 10 - stand; 11 - sampling pipes; 12 - pre-treatment chamber.

An aqueous suspension of contaminated sorbent is fed into the installation through the inlet pipe 2 and enters the jet-pulsating field of acoustic vibrations generated by hydrodynamic emitters 5, mounted at an angle of 90 ^{° to} each other in the pre-treatment chamber 12. When water passes through the hydrodynamic emitters under a pressure of at least 2 5 kgf / cm ² , the latter excite the jet-pulsating field of acoustic vibrations of a wide spectrum of frequencies with a fundamental harmonic of 2.5 kHz. The rarefaction created in this case in the resonator chambers of the hydrodynamic emitters draws atmospheric air into them through the nozzle 6. The air disperses, barbates in the aqueous suspension of the sorbent, and then enters with it into the ultrasonic treatment chamber 1. The sorbent in the aqueous medium under the influence of an acoustic jet-pulsating field saturated with bubbles of dispersed air is subjected to preliminary (coarse) cleaning in chamber 12. In this case, sorbent decanglomeration, dispersion of the pollutant and purification take place ka external surface.

 Further, the sorbent stream in a contaminated aqueous medium enters the ultrasonic cleaning chamber 1, where, under the influence of an ultrasonic field, it undergoes further (main) cleaning. The ultrasonic field is created by magnetostrictive transducers MPS - 2.5 - 18, connected to the ultrasonic generator UZG 3 - 10. Dispersed air, entering together with the aqueous suspension of the sorbent in the ultrasonic cleaning chamber, contributes to the formation of additional cavitation and pulsation centers, which in turn intensifies the process deep cleaning of the internal pores of the sorbent.

 To exclude the possibility of airing the installation, the acoustic chamber 1 is mounted on a stand 10 vertically above the pre-treatment chamber 12. For ease of maintenance, the chamber 1 is equipped with an inspection window 3 for visual observation of the movement of the sorbent suspension flow. The pressure in the chamber is controlled by a manometer 9.

 For sampling the sorbent for analysis, before and after cleaning, the installation is equipped with appropriate nozzles 11.

 After cleaning, an aqueous suspension of the purified sorbent is fed through the outlet pipe 3 to a Na-cation exchange filter, from which contaminated water is removed.

 In this example, the sorbent before purification had a total contamination of 5.51 wt.%, After purification - 0.36 wt.%, I.e. the degree of purification of the sorbent was 99.3%. After purification of the sorbent, the Na-cation exchange filter increased the yield of purified water by 1.6 times, which made it possible to reduce the specific consumption of the sodium chloride regeneration solution by 25-30%. Industrial implementation of the invention allows to significantly improve the environmental and economic indicators of the water treatment process.

Claims (5)

 1. The method of purification of synthetic organic sorbents, including processing the flow of an aqueous suspension of the sorbent in an ultrasonic field, characterized in that the aqueous suspension of the sorbent is pre-treated in the acoustic field of the acoustic waves of low frequencies created by the supply of water through hydrodynamic emitters of acoustic vibrations, while in the aqueous suspension sorbent sparging air.  2. The method according to p. 1, characterized in that the water through the hydrodynamic emitters serves under pressure.  3. Installation for cleaning synthetic organic sorbents, comprising a chamber for ultrasonic treatment with built-in magnetostrictive transducers connected to the generator, an input and output nozzle for the sorbent, characterized in that it further comprises a pre-treatment chamber equipped with at least two hydrodynamic emitters installed under angle to each other, with each hydrodynamic emitter equipped with a fitting for supplying water and a fitting for supplying air, and the inlet nozzle for The ribbon is connected to said pre-treatment chamber.  4. Installation according to claim 3, characterized in that the ultrasonic treatment chamber is located vertically above and coaxially with the pre-treatment chamber. 5. Installation according to claim 3, characterized in that the hydrodynamic emitters are installed at an angle equal to 90 ^o .