SU1369786A1 - Method of regeneration of ion exchanger - Google Patents

Abstract

The invention relates to the field of purification of liquids by ion exchange and can be used in the energy, chemical, metallurgical, food and other industries and allows for an increase in the efficiency of regeneration. The fluid flow at a distance from the filtering grid of 0.5-2.0 times the thickness of the fixed backfill layer of the mixture of ion exchangers is divided into two coaxial streams followed by their connection, while in one of the streams, for example in the central one, the average velocity is maintained. provide- fluidization of heavy ion exchanger with the height of its fluidization beyond the initial portion of the flow coupling. 1 il. (L

Description

with and with

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The invention relates to the cleaning

ion exchange liquids and can be

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used in power engineering, chemical, metallurgical, pshtsevaya and other sectors of the industry and where it is necessary to use liquids with small foreign chemical inclusions, in particular for water preparation, as well as highly reliable from a corrosive point of view of closed fluid circulation systems.

The aim of the invention is to increase the efficiency of regeneration.

The drawing shows a device that implements the method of regeneration of ion-exchange filter,

The device contains a cylindrical body 1 of an ion-exchange filter, a central tube 2 located coaxially with body 1, a filtering grid 3, a holder 4 providing centering and attaching the center tube case 4 to 4, a buffer capacitance 5, a grid 6 to exclude the removal of ionite particles from the housing 1 of the ion exchange filter and the pipe 7 connected to a pump (not shown).

When a regenerating fluid is fed into the housing 1 of an ion-exchange filter containing a mixture of heavy and light ionites, the fluid flow is divided into two coaxial flows, the central of which passes through tube 2 and the peripheral flow passes through the annulus

the channel formed by the housing 1 and the tube 2. The separation of the regenerating fluid into two streams at a distance of 0.5-2 thicknesses of the stationary backfill layer of the mixture of ion exchangers allows the entire backfill layer of the mixture of ion exchangers to be fluidized. At a certain flow rate of the regenerating fluid in the peripheral flow is maintained

binary mixture of ion exchangers in terms of filter volume, reduces the amount of regenerating liquid and regeneration time.

With this creation of the flow of fluid passing through the mixture of ion exchangers, the light fraction is brought to a suspended state both in the central and in the peripheral flows, moreover, if in the central flow the velocity

five

five

0

five

0

V,

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,

lung speed

the ion exchanger Vj, the lightweight ionite is almost entirely collected in the peripheral flow, and even if the flow rate V is in the range V. V. (where V | is the critical weighing rate of the heavy ionite, most of the light ion exchanger collects in the peripheral flow, because the cross section is higher in which the interaction of the central and peripheral flows starts due to the contact, both light and heavy ion exchangers flow into the peripheral flow. The heavier ion exchanger moves due to fluidization to the central At the joint flow and at the junction of the flows, it enters the peripheral flow, in which, under the influence of gravity prevailing over the lifting force, is lowered into the fluidized bed of the lightweight ion exchanger. Upon reaching the beginning of the tract, the heavy ionite from the peripheral flow enters the central stream a small portion of the undivided motion of the main flow, equal to 0.5-2.0 Thicknesses of the backfill layer of the mixture of ion exchangers) and is again carried upwards.

Studies have shown that the distance from the filtering grating, on which the fluid flow is divided, turns out to be

average speed, providing all important influence on the process

the fluidization of the light ion exchanger, and in the central one, the average velocity is maintained, which provides for the fluidization of the heavy ion exchanger with the height of its fluidization beyond the initial Uch-gQ oral canal;

The drain of the connection of the peripheral and central flows. In this case, the uniform distribution of heavy and light ion exchangers in the housing 1 of the ion exchange filter is carried out, as a result of which the efficiency of the regeneration process is increased.

The described regeneration method promotes even distribution.

55

a uniformly mixed volume of yotov is created at a distance from the futuristic lattice of 0.5-2.0 to the cores of the fixed backbone layer of the mixture of ion exchangers, since with a smaller distance the number of heavy ion exchangers passing into the central channel is sufficient to create , and by the volume of ion exchangers are formed

the organization of the movement of ionites.

To exist and maintain the circulation of heavy ion exchanger, it is enough to ensure its passage to the center

evenly mixed volume of ion exchangers is created at a distance from the filtering grid equal to 0.5-2.0 thicknesses of the stationary interleaving layer of the mixture of ion exchangers, since with a smaller distance the number of heavy ion exchangers passing into the central channel is not enough to create uniformity, and by volume ionites are formed

b

fluctuations in the composition of light and heavy ion-tops, and with a greater distance, a considerable part of heavy ion exchangers are not involved in the circulation process and are excluded from active regeneration processing,

Thus, in the stream, in which, at the indicated flow separation, a light ion exchanger is provided with fluidization at a medium rate, for example, in the peripheral one, particles of a heavy ion exchanger are also contained. In this case, as shown by 3KCneptfMeHTH, you can

of the conditions of this method, that the mixing of particles is so good in the peripheral zone that it is impossible to select a larger or smaller local part of the spaces where the particles would be large in a single color.

It was also seen in expert1 {as particles of a lighter ion exchanger of the bottom of tank 1 were quickly ejected into the inter-annular gap through tube 2 particles of a heavier ion exchanger, right at the bottom of tank 1, were drawn

provide a quasi-uniform distribution of 15 tube 2, fluidized in it

in the peripheral flow of a heavier and lighter fraction of ion exchangers.

After the beginning of the movement of the fluid in the housing 1 in the center: 1 tube 2 and intercollection 1, the target space between them the velocity profiles are different, and provided that the average speed in the central tube V. is satisfied

steals the inequality V V V g, where Vl is the critical velocity at the moment

the yellow fracion of the mixture of ion-tops, the BfjicoTa layer and the fluidization of the heavy ion exchanger in it agree with the inequality L; 1 + h, where h is the distance from the filtering grate to the point of flow separation (the ends of the tube 2), and the average velocity in the annulus space VP corresponds to the inequality,

v

where v

V "respectively

critical rates of weighing and removal of the fraction of the ion exchange mixture, there is a constant equalization of the mixture of ion exchangers in the peripheral flow. At the same time for practice it is important that the volume occupied by the central flow in tube 2 be as small as possible, since in this case the size of the device is reduced to realize

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The described method of regeneration contributes to the uniform distribution of anion exchange resin. and cation exchangers in terms of FSD, reduces the amount of regenerating water and regeneration time. In addition, the efficiency of the regeneration itself is significantly increased. As shown by experimental studies, during thermoregeneration of FSD by the proposed method, the capacity of regenerated resins, anion exchangers and cation exchangers rises from 75-80 to 90% of their total static capacity.

proposed method liquid.

Claims (2)

Experiments have shown that uniform mixing of ion exchangers in the peripheral (inter-ring) flow occurs up to d / D, 50.1, which corresponds to several percent of the flow through the central tube. 2. The uniformity of mixing was determined visually, the clearer the differences in the particles of ionites, the heavier and lighter ionites were stained in different colors. It was clearly visible through the glass walls of the container 1 when realizing the purity of the invention. 50 A method of regenerating an ion-exchange filter using a filtering grid with a filling layer of heavy and light ion exchangers installed in the housing, consisting in passing a flow of regenerating fluid through the mixture of ion exchangers, so that, in order to increase the efficiency of regeneration, the flow of liquid at a distance from the filtering grid of 0.5-2.0 times the thickness of the fixed backfill layer of the mixture of ionites, is divided into two coaxial of the conditions of this method, that in the peripheral zone the mixing of particles is so good that it is impossible to isolate a larger or smaller local part of the space where the particles would be in a large degree of the same color. It was also seen in the expert that the particles of a lighter ion exchanger from the bottom of tank 1 were quickly ejected into the annulus gap through tube 2, and particles of a heavier ion exchanger, falling to the bottom of tank 1, were drawn into and in 0 five 0 five 0 the process of fluidization left the tube 2, then descend into the inter-annular gap. The separation of the flow into two coaxial flows can be ensured even without the use of solid surfaces due to the application of mass forces. For example, if you use the ferromagnetic parts of JJI ischitov, you can create a barrage of electromagnetic field, interfering with its transverse movement of ion exchangers through the cylindrical surface of the selected volume of liquid as a central flow. The described method of regeneration contributes to the uniform distribution of anion exchange resin. and cation exchangers in terms of FSD, reduces the amount of regenerating water and regeneration time. In addition, the efficiency of the regeneration itself is significantly increased. As shown by experimental studies, during thermoregeneration of FSD by the proposed method, the capacity of regenerated resins, anion exchangers and cation exchangers rises from 75-80 to 90% of their total static capacity. A method of regenerating an ion-exchange filter using a filtering grid with a filling layer of heavy and light ion exchangers installed in the housing, consisting in passing a flow of regenerant fluid through the mixture of ion exchangers, in order to increase the efficiency of regeneration the distance from the filtering grid, equal to 0.5-2.0 times the thickness of the fixed backfill layer of the mixture of ion exchangers, is divided into two coaxial streams followed by their connection, while in one of the streams, for example in the central one, maintain an average speed providing fluidization of heavy ion exchanger with the height of its fluidization beyond the initial part of the flow coupling.