RU2108151C1 - Method for cleaning polymer or copolymer sorbent - Google Patents

Abstract

FIELD: cleaning the polymer or copolymer sorbents of mechanical filters of utilized demineralizing. SUBSTANCE: method includes hydraulic transfer of sorbent to vessel provided with drainage system and hydrodynamic radiators. Hydraulic transfer is performed simultaneously with excitation in the vessel of acoustic oscillations of frequency wide band, periodic supply of compressed air and conditions removal of polluted water. EFFECT: higher efficiency. 3 cl, 1 dwg

Description

 The invention relates to the field of purification of sorbents and filter materials based on polymers or copolymers used in mechanical filters of block desalination plants.

 A known method of purification of a copolymer with a contaminated surface by intensive mixing, in which the particles are abraded, thereby removing pollution (patent GB N 1058225, B 01 J 49/00, 1967).

 The disadvantage of this method is the high loss of material.

A known method of cleaning granular filter material, including the supply of washing water countercurrent with an intensity of 1.5-2.0 l / s • m ² and the influence of acoustic vibrations in the form of a jet-pulsating field, moved in the volume of the material in the plane perpendicular to the flow (Patent RU N 2042381, B 01 D 24/26, 1995).

 However, this method is suitable for cleaning filter materials in a drinking water purification pool and is little suitable for cleaning material in a mechanical filter of a block desalting plant.

 A known method of purification of the sorbent in a filter column by washing with water supplied by jets through hydrodynamic activators (Patent RU N 2080822, B 01 J 47/02, 1996).

 The disadvantage of this method is the low degree of purification.

 To increase the degree of purification, it was proposed to use the treatment of sorbents with compressed air, which improves the loosening of the entire load and the separation of contaminant particles from sorbent grains.

 The closest in technical essence and the achieved result is a method of cyclic treatment of ion exchangers with air and water, including hydroloading the sorbent into a container equipped with a drainage system, treating the sorbent for 1 min with air, and then for 2 min by direct washing with water, resulting in a layer of sorbent it loosens, mixes, contaminants break down from the sorbent grains and are continuously carried out by water through a collection and distribution device. If the sorbent is very dirty, it is necessary to repeat the cycles up to 10 times. (L.M. Blyankman. Cleaning filter materials. M.: Energoizdat, 1981, p. 37-39). Although the known method allows to reduce the consumption of washing water and almost completely remove pollution, its productivity is not high enough.

 The objective of the present invention is to develop a cleaning method that allows a high degree of purification to do without the use of chemicals, reduce the amount of wash water, the duration of the process and improve the environmental and economic performance of the process.

The problem is solved by the described method of purification of a polymer or copolymer sorbent of mechanical filters of block desalination plants from contamination products, including hydroloading the sorbent into a tank equipped with a drainage system and hydrodynamic emitters of acoustic vibrations, treating the sorbent with water supplied under pressure through the aforementioned emitters simultaneously with hydroloading of the sorbent, periodic compressed air supply to the drainage system and continuous removal of contaminants. It is preferable to supply water through the emitters under a pressure of 4.5-5.5 atm. with a flow rate of 30-40 m ³ / h, and supply compressed air for 1-2 minutes with an interval of 50-60 minutes.

 The proposed invention can be implemented in various devices equipped with a drainage system and hydrodynamic emitters of acoustic vibrations.

 The following is an example of the implementation of the proposed method on one of the existing block desalination plants, but this is not limited to the scope of the invention.

 The drawing shows one of the possible installation schemes for implementing the proposed method.

 Example.

 Installation - BOU consists of a sealed container - 1, at the bottom of which there is a drainage system 2 with a tap and a pipe 3 for supplying compressed air. The lower drainage system has a pipe with a tap for draining (draining) contaminated water - 4. In the middle of the tank 1 there is a vertical pipe 5 with hydrodynamic emitters 6 of various types. On the middle part of the tank there is an average drainage system 7, which is also equipped with a tap - 8 for supplying compressed air and for draining dirty water using a tap 9. A vertical pipe 5 with hydrodynamic emitters is connected to an inlet pipe 10 through which water is supplied under pressure the process of exciting acoustic oscillations of a jet-pulsating type of a wide spectrum of frequencies.

 On the upper part of the tank 1, there is an ascending outlet pipe 11 for transporting the dirty and purified copolymer to the original tank.

 The process of hydro-reloading the contaminated copolymer is carried out through the upper outlet pipe 11, while closing the valve 12 for draining dirty water. The pressure of the supplied water to the hydrodynamic emitters of acoustic vibrations is controlled by a pressure gauge 13. To maintain and control the pressure in the sealed container 1, there is an “air” pipe with a valve 14 on the outside for pressure relief in the tank 1. Monitoring the cleaning process of the BOU copolymer carried out through special viewing windows 15 located in the lower and upper part of the tank. The original contaminated copolymer under excess pressure is fed through the pipeline-conveyor system to the inlet of the pipe 16, while the valve 12 is closed. The crane 17 with a pipe serves to supply compressed air to the emitters, if they are clogged with resin.

 The cleaning process of the copolymer of a mechanical filter of a block desalting plant - BOW is carried out as follows.

The initial contaminated styrene-divinylbenzene-based copolymer is fed through the pipeline to the inlet 16, and then transferred via the pipe 11 to the container 1. Simultaneously with the hydro-transfer of the copolymer, the hydrodynamic emitters are switched on by supplying clean water under a pressure of 5 atm to the inlet 10, thereby exciting acoustic vibrations of a jet-pulsating type in the entire volume. Moreover, both the lower drainage 2 and the middle drainage 7 are open to remove contaminated water. In process of hydro overload of the contaminated copolymer into the tank 1, an increasing number of hydrodynamic emitters come into operation as a generator of acoustic vibrations. From time to time, at intervals of 60 minutes, compressed air is supplied to one of the drains for 1-2 minutes (in order to clean the small slots of the drainage system from blockage with fine resin), then the process is carried out with another drainage when the drain valve for dirty water is closed. The performance of the water supply to the emitters is 30-40 m ³ / h. The cleaning process of the copolymer lasts depending on the degree of contamination and its amount. After 6 hours of continuous cleaning in the field of acoustic vibrations, the purified copolymer by means of hydrodynamic emitters enters the original capacity by hydro-reloading through the outlet pipe 11, and then into the pipe 16, while all the taps, both drain and air, are closed.

 As shown by the results of industrial tests, the method allowed to clear the copolymer from oil products by 85-87%, and from iron by 97%. The process does not require the use of a chemical reagent, and the consumption of water for cleaning has decreased by half.

Claims (3)

 1. A method of purification of a polymer or copolymer sorbent of mechanical filters of block desalination plants from pollution products, comprising hydroloading the sorbent into a tank equipped with a drainage system, treating the sorbent with water and compressed air and continuous removal of contaminants, characterized in that the hydroloading of the sorbent is carried out in a tank additionally equipped with hydrodynamic emitters of acoustic vibrations, water is supplied under pressure through the aforementioned emitters simultaneously with the hydroload of the sorbent and compressed air is periodically supplied to the drainage system. 2. The method according to claim 1, characterized in that the water is supplied at a pressure of 4.5 to 5.5 atm with a flow rate of 30 to 40 m ³ / h.  3. The method according to claim 1, characterized in that the compressed air is supplied for 1 to 2 minutes with an interval of 50 to 60 minutes.