LT3153B - Nonwaste method for anionite regenerating of chlorine ionite filter - Google Patents

Abstract

This invention is concerned with thermal energetic fields. For decreasing the consumption of regeneration reagents and for protecting the environment from regeneration products, it is offered for use with hydrochloric acid (HCl) for anionisation of chlorionitic filter regeneration, with feeding from bottom to top.The anionic regeneration reliance on hydrochloric acid consumption is proportional. The hydrochloric acid is used strictly under the stoichiometric reliance. The by-product of regeneration is carbon dioxide, which is collected into a separate tank and is repumped into a balloon for further use in different industries, e.g. the food industry.

Description

The present invention relates to the field of thermal energy, more particularly to methods for preventing the formation of sedimentation in heaters, heating and supplying heating surfaces and circulating on heat exchangers, water boiler heat transfer nuclear power water supply systems, decontamination water, water for heat supply systems. power, carbonate water reduction systems, or more precisely, regeneration technology of ion-exchange materials that reduce carbonate water hardness.

One way to prevent the formation of sediment on heat transfer surfaces is to clean the water used to power the heat supply systems by means of chlorine ion filters (UJ.B. AntJ) inn CnpaBOMHMK no ΒΟΑΟΠΟΑΓΟΤΟΒκε KOTeAHbix ycTaHOBOK.-M. Chlorionite filters are loaded with ion-exchange material, anion, which absorbs hydrocarbonate ions in the water purification process and releases chlorine ions instead. At the end of the filter exchange capacity, anion exchange regeneration is performed - restoration of the ion exchange properties of the anion exchange with respect to hydrocarbonate ions. Usually, the anion exchange regeneration of the chlorionated filter is accomplished by passing the sodium chloride (NaCl) solution through the filter from top to bottom. In this case, the ion-exchange reaction is given by the following equation:

An HCO ₃ + NaCl = An C1 + NaHCO ₃

This method of regeneration has these disadvantages.

Because of the non-linear nature of the reagent consumption dependence on the recovery rate, even in order to achieve a 60-70% recovery (anion exchange), the consumption of sodium chloride must be several times the theoretical amount required. Excess reagent (NaCl) and by-product of regeneration - soda (NaHCO ₃ ) solution - are discharged into drainage and further into open water bodies.

The purpose of the proposed process is to reduce reagent consumption for regeneration and to prevent the release of regeneration products into the environment.

The stated aim is achieved by proposing that the regeneration of the chlorionated filter be effected by passing a solution of hydrochloric acid (HCl) from the bottom upwards.

The ion-exchange reaction in this case is given by the equation:

An HCO ₃ + HC1 = An Cl H ₂ CO ₃

Carbonic acid (H ₂ CO ₃ instantly decomposes into water (H ₂ O) and carbon dioxide (CO ₂ )):

H ₂ CO ₃ = H ₂ O + CO ₂ , which passes through the anion by mixing, is removed from the filter and collected in a separate container. The removal of regeneration by-product (CO ₂ ) from the reaction zone has a linear character in the extent of regeneration relative to reagent (HC1) consumption, ie one reagent is completely consumed. Therefore, even a 100% anion exchange recovery requires a theoretically calculated (stoichiometric) reagent consumption.

FIG. The results of the laboratory tests, which confirm the linear dependence of the carbon dioxide emission (VCO ₂ ) on the consumption of hydrochloric acid (HCl), ie the character of the dependence on the acid consumption of the regeneration scale are presented in Fig. I:

- hydrochloric acid concentration of 0.92 mg-eq / l;

hydrochloric acid concentration of 2.60 mg-eq / l;

- hydrochloric acid concentration of 12.00 mg-eq / l.

FIG. Figure 2 depicts the principal technological scheme of anion exchange regeneration for carbon capture and utilization.

The pump I shown in the diagram is connected to a filter 2, the latter connected to a ejector 4 via a drainage system 3. The reaction vessel 5 is connected to the upper part 2 of the filter 5. The hydrochloric acid reservoir 6 is connected to the filter 2 via water capacity 7. Acidity is determined by pH meter 8. Decarbonator 9 is connected to ejector 10 and water capacity II. Pump 12 fills this water capacity II. The by-product reaction vessel 5 is connected to a compressor 13 and a gas cylinder 14.

The scheme works this way.

Pump I is turned on and circulation of water in the filter 2 from the bottom up through the central drainage system 3 and the ejector 4 is achieved. The water is used to provide an anion exchange expansion of 20-30%. From the tap 6, the hydrochloric acid is fed to the filter 2 by means of an ejector 4. The carbon dioxide formed passes through the anion exchanger layer and moves from the filter 2 to the container 5. The container 7 acts as a hydro barrier for increasing pressure When the water level in the filter 2 rises to level b, the acid supply to the filter 2 is stopped, the amount of water in the filter 2 is reduced to the level a by discharging the water into the tank 5, then the acid 2 is again supplied to the filter 2. When the calculated amount of acid is stopped, the feed is stopped. After 10-15 min. (time to be adjusted during tuning) pump I is switched off, filter 2 is filled with the initial water volume, displacing carbon dioxide into the tank 5. filter 2 is washed with the initial water volume, the water is poured into the tank 5. pH increase> 7 (control by pHmeter 8) considered completed, the washing shall be interrupted. Next, filter 2 can be used at work or reserved.

When the water content in tanks 5 and 7 rises to the set level, it is disposed of as follows:

- Decarboniser 9 fan is activated:

- activating the ejector 10, adjusting the consumption of acidic (from tanks 5 and 7) and purified (after filter 2) water in such a way as to completely neutralize the acidic water.

When filling the tank 11, the pump 12 is started. From the tank 5, carbon dioxide is pumped into cylinders 14.

FIG. The technological diagram depicted in Fig. 2 provides for the use of conventional tanks not calculated for manometric pressures in water treatment plants for the supply of heating networks.

Compared to known techniques, the use of the proposed regeneration technique offers the following advantages:

(1) the absence of waste discharges into the environment;

(2) the collection of the by-product regeneration (carbon dioxide) into a separate container, its storage in cylinders and its utilization in a variety of industrial applications; food, in the branches.

3) 100% strict stoichiometric dependence of reagent, hydrochloric acid reagent.

DEFINITION OF INVENTION

Claims (1)

DEFINITION OF INVENTION Chlorionitic filter anion-free regeneration method that restores anion exchange absorption 5 with respect to bicarbonate ions and comprising the action of a filter in solution, characterized in that it uses hydrochloric acid to pass it through the filter from the bottom up.