The method of obtaining sorption-filtering material and a device for its implementation

 

(57) Abstract:

The invention is intended to obtain sorption-filtering materials, absorbing aerosols, vapours harmful substances (radioactive iodine, polonium, mercury, pesticides, etc. from the air and process gases. Through the fibrous material purge air and sprayed the sorbent. When spraying on a layer of material or the flow of air impose alternating pulsating vibration. A device for implementing the method comprises a fan, the camera spraying with a sprayer, hopper sorbent, auxiliary filters, the tape drive mechanism to pull the fibrous tape-billet through a sputtering chamber, a mechanical vibrator fibrous layer or the pulsator pressure. The invention has allowed to obtain a material with longer uniform layer of sorbent in the form of a long tape and automate technological procees production material. 2 C. I. 2 C.p. f-crystals,2 tab., 2 Il.

The invention relates to techniques for cleaning of gases from radioactive and highly toxic chemicals, in particular the production of sorption-filtering materials for trapping aerosols and vapors harmful substances.

The disadvantage of this method is the large resistance to the flow passing through the material of the air and the fragility of the material.

Closest to the invention is a method and apparatus for the manufacture of sorption-filtering material [3] , which is intended for application by spraying various powdered sorbents on the filter material FP (Petryanov Filter) to obtain the filter elements of the universal respirator type "Petal".

A disadvantage of the known method and device is that when applying powdered sorbents by simply blowing air sprayed it sorbent through the fibrous layer of material particles of the sorbent according to the law of filter deposited on the fibers and are located in the fibrous layer according to the exponential dependence on the layer thickness and slightly penetrate into the depth of the layer, which limits the quantity of sorbent in the fibrous layer and reduces the sorption capacity of manufactured methioninamide small fractions of the sorbent in the fibrous layer and an extended layer of sorbent.

In the method of obtaining sorption-filtering material, which consists in blowing air sprayed it sorbent through the fibrous layer of the material according to the invention, blowing off produce when applied to a layer of material or air flow alternating pulsating vibration generated by a mechanical vibrator or air pulsator, under which there is a redistribution of deposited particles of the sorbent on the fibers and their penetration into the depth of the fibrous layer of material. It also destroyed superficial peel sorbent located on the front layer of material and creating additional resistance to the passing flow of air with vapor sorption.

The invention is as follows.

When a mechanical impact in the process of applying coal sorbent with a particle size less than 40 microns on the fibrous material FRR-70 with the speed of 10-50 cm/s, the vibration is produced with a frequency of 1 to 30 Hz, amplitude 1 to 30 mm and the number of cycles (times) 10 - 30. The limits of vibration is selected in accordance with the data in the table. 1.

When the selected vibration thresholds in the fibrous layer results in deep penetration of small particles of sorbent in Bolognese the material contact the entrained vapor from the sorbent and increases its absorptive capacity and capacity. The increase of vibration frequency and amplitude outside the specified limits would be inappropriate because it does not have a significant impact on the distribution of the sorbent layer and leads only to an increase in its resistance when the vapor sorption, which increases the energy consumption for the production of the material and its use.

When applying the pulsator pressure applying coal sorbent with a particle size less than 40 microns on the fibrous material FRR-70, located on the layer of bonded fibers, with a speed of 20 - 45 cm/s vibration is produced with a frequency of 5 to 30 Hz, with a ratio of pressure pulsations to the pressure of the main flow of 1.5 to 30 and the number of cycles 20 - 150. The limits of vibration is selected in accordance with the data in the table.2.

The selected limits of the pressure pulsations in the air flow sprayed it sorbent sufficient to create in the fibrous material of the extended layer of the sorbent on the depth of the layer, which significantly increases the sorption capacity of the produced material. The increasing frequency outside the specified limits smooths out the ripple and reduces the ratio of pressures, which leads to deterioration of the distribution of the sorbent according to the depth of the fibrous layer. The increase in pressure ratio for the specified predicate fibrous material was selected loose filtering material FRR-70 (diameter fibers 7 μm) with density layer is not more than 3% and a resistance of 0.3 mm of water. tbsp. at a speed of passing air flow of 1 cm/S. This material showed the best result of making sorbent.

A device for obtaining sorption-filtering material contains a cell deposition, fan, tank, spray sorbent and cleaning filters. The sucking of air and sprayed it sorbent carry out bottom-up on the driving fibrous tape is blank due to the vacuum in the upper part of the chamber with simultaneous imposition of impact vibration on the layer of fibrous material generated by a mechanical vibrator according to the scheme depicted in Fig. 1, or the pulsating pressure at the flow passivemode air through the piston compressor according to the scheme depicted in Fig.2.

The device allows you to fully automate the process of making sorption-filtering material and make it as wide or narrow ribbon.

Obtaining sorption-filtering material in the form of a roll of SFM And the setup is shown in Fig. 1, is carried out by spraying on glued to the roll of cloth filter material FRR-70-0.3 with air flow rate of 10 cm/s finely ground coal OS-A, nitrate impregnated with silver, N.

The device consists of a chamber 1 spraying with spray 6 sorbent, tape mechanism with two rolls 4 for winding a fibrous material 2, fan 3 medium pressure for air suction, hopper 5 and the sorbent, the nozzle 6 and the mechanical vibrator 10, located in the upper part of the sputtering chamber 1, and an auxiliary spool 7 with a covering of fibrous material and a filter 8, a flow meter 8.

The device operates as follows.

Fill in the installation of the coils of the main fiber and the auxiliary covering material is poured into the hopper of the sorbent and submit it to the cell deposition. Then include the tape drive mechanism, a fan and a mechanical vibrator. When this occurs, the dispersion of the sorbent at the bottom of the camera, sucking it through the moving fibrous material under the action of vibration filling of fibrous sorbent layer. At the outlet of the spraying chamber deposited fibrous material covered with a fresh layer of auxiliary fibrous material and delivered on a bobbin in a roll.

In this way was obtained sorption-filtering material SPS-containing sorbent 4 - erial SFM is designed and is used to determine the levels of air pollution with radioactive iodine.

The method and apparatus also provide for obtaining narrow sorption-filtering tapes type SFL-2I-50 and SFL-R-50 for capture and analysis of content in air emissions of radioactive iodine and mercury respectively. The application of the sorbent is carried out by blowing air sprayed it fine sorbent through the driving fibrous tape material FRR-70-0.3, located on the layer of sized fibers with a speed of 20 cm/sec. In the deposition process of the sorbent at a flow of air impose vibration generated plunger pulsator 11 pressure with a frequency of 12 Hz, the number of bumps 120 and the pressure ratio of the pulsation pressure of the main flow of air through the fibrous material 2.

Device for the manufacture of the tape consists of a tape drive mechanism, bobbins 4,7 fibrous tapes-pieces, fan 3, the sputtering chamber 1, the hopper 5, the nozzle 6 of the sorbent filters 8 and the pulsator pressure 11, the flow meter 9. The device schematically depicted in Fig.2.

The device works in the same way as the previous one, only the vibration of the plunger is created by the compressor 11.

Using the proposed device implemented industrial manufacturing sorbcionnaya radioactive iodine and mercury.

Tape SFL-2I-5 - SFL-R-50 are designed and used in radiometers for sampling and determining the content accordingly radioiodine and mercury in the air.

Using the proposed method and devices for obtaining sorption-filtering material allowed to obtain material with longer uniform layer of sorbent, which increases the efficiency of sorption and time of protective action by a few percent.

In addition, the proposed method allowed us to obtain sorption-filtering material not only in the form of separate blanks, but in the form of a long tape, and fully automate the manufacturing process of the material.

1. The method of obtaining sorption-filtering material by blowing air sprayed it fine sorbent through the fibrous material, wherein the coating is produced after application of the layer of material or air flow alternating pulsating vibration generated by a mechanical vibrator or the pulsator pressure.

2. The method according to p. 1, characterized in that the vibration generated by mechanical vibrator, carried out with a frequency of 1 to 30 Hz, amplitudinal pressure with a frequency of 5 - 30 Hz, the number of cycles 20 - 150 and when the ratio of the pressure vibration to the pressure of the air flow of 1.5 to 30.

4. A device for obtaining sorption-filtering material containing the fan, the camera spraying with a sprayer, hopper with sorbent and auxiliary filters, characterized in that it is provided with a tape drive mechanism for pulling the fibrous tape-procurement through the sputtering chamber, and a mechanical vibrator fibrous layer or the pulsator pressure.

 

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