Device for neutralization of the liquid a-wastes of the low and medium level of radioactivity

FIELD: atomic power; liquid A-wastes processing.

SUBSTANCE: the invention is pertaining to the field of atomic power, in particular, to the liquid A-wastes processing. The invention contains: a device for neutralization of the liquid A-wastes of low and medium level radioactivity, which contains an upright located vaporizing container placed inside a ring-type tank. The vaporizing tank has a heater located in its middle part and louvered deflectors and a branch pipe of a condensate withdrawal - located in its upper part. The vaporizing tank is made in the form of the shut funnel with its narrow part directed downward. The bottom of the shut funnel represents a replaceable cylinder with a sorbent and is placed inside the second heater. The ring-type tank having a branch pipe to feed the processed solutions is connected to the vaporizing tank by a pipeline with a pressure-relief valve. Advantage of the invention is an improved efficiency of water purification.

EFFECT: the invention ensures improved efficiency of water purification.

1 dwg

 

The invention relates to the field of processing of liquid radioactive waste of low and medium activity level, resulting in a contour waters reactors of nuclear submarines (NPS)have exhausted their resource.

Known design evaporator with forced circulation (Assocition, WEA, Mijikai. Disposal of liquid radioactive waste. M.: Energoatomizdat, 1985, page 23, figure 2.6). This solution is unreliable due to the presence of moving parts - pump and compressor. Additional measures are needed for further processing of the brine.

The closest is stationary design evaporator with remote heating chamber and natural circulation (Assocition, WEA, Mijikai. Disposal of liquid radioactive waste. M.: Energoatomizdat, 1985, p.22, 2.5). The design contains a heating chamber, using as coolant vapor, as well as the Belleville column designed for the purification of juice from condensed vapor and aerosol entrainment.

The disadvantage of such a device is receiving during operation one stripped off solution (brine), which requires additional operations and equipment for further processing.

The technical result of this device is the ability to carry out at the same time p is ocess evaporation to obtain a condensate, suitable for discharge into the waters, and the concentration obtained in the process of evaporation of brine, followed by its deposition on the sorbent.

The technical result is achieved in that the device is a vertically located evaporative capacity, placed inside the annular tank, in the middle of which there is a heating element. In the upper part of the evaporating vessel are louvered baffles. Evaporative capacity has a closed funnel, the narrow part at the bottom. The bottom of the tank is removable glass sorbent placed in the internal volume of the sorbent heater. Annular tank having an inlet for the supply of processed solutions, coupled with evaporative capacity of the pipe with non-return valve. Evaporative capacity of the cover is closed with the connection of the condensate drain.

The drawing shows a device for the decontamination of liquid radioactive waste of low and intermediate level of radioactivity. It is an evaporative capacity (1)placed inside the annular tank (2). In the upper part of the evaporating vessel (1) are louvered baffles (3). Evaporative capacity (1) closed by a cover (4) with the connection of the condensate drain (5). The heater of the evaporator (6) is in the middle of the evaporative capacity (1). In the lower part of the evaporative eat the spine (1) is placed a removable sleeve (7) with sorbent (8). Replacement glass (7) sorbent (8) is, in turn, in the internal volume of the heater (9) of the sorbent (8). With the main volume of the evaporative capacity (1) replacement glass (7) sorbent (8) is connected to the flanged connector (10) with a fine-meshed net (11)to prevent entrainment of the sorbent. Ring tank (2)having a nozzle for supplying recyclable solutions (12), connected to the evaporative capacity (1) nutrient pipeline (13) with non-return valve (14), which prevents the reflux of the solution from evaporating capacity in the annular tank. Feeding pipelines (13) can be two.

The device operates as follows.

Ring tank (2) is filled through the pipe supply recyclable solutions of (12) to a certain level liquid radioactive waste. In evaporative capacity (1) recyclable solution flows from the annular tank (2) through nutrient pipeline (13). Reverse movement of the solution is excluded due to the presence of the pipeline (13) check valve (14). Thus, in the evaporation vessel (1) and the annular tank (2) is the same level of the processed solution. When heated by the heater (6) the upper layers of the solution in the evaporating vessel (1) to a temperature somewhat below the boiling point of the particular solution is the process of evaporation from the surface. The resulting pair is undesirous on the louvered baffles (3), located in the upper part of the evaporation tank (1). The secondary steam through pipe condensate drain (5) enters the tank-a collection with a high degree of purification of the condensate from radionuclides. As the lowering of the processed solution in the evaporating vessel (1) a solution of an annular tank (2) through nutritional pipe (13) with non-return valve (14) is fed into the evaporation tank (1) due to the difference of hydrostatic pressure in both tanks. When conducting follow-up examinations in the tank-the collection, provided that the definition of MPC values below the standard, the water from the tank collection is reset in an outdoor pond or water area. When determining the MPC values approaching regulatory, filing solution for distillation ceases. Stops the power supply to the heater of the evaporator (6) and starts the power supply to the heater (9). Accumulated in the evaporation vessel (1) brine in the process of heating pariveda to dryness in the presence of sorbent (silica gel). When this happens sorption dissolved in brine radionuclides. After deposition of radionuclides on the sorbent heater (9) is turned off. The distillation process is resumed, the power to the heater (6) evaporative tank (1). In a circular tank (2) to a certain level is pumped solution for processing. PR is several cycles (specific amount of the latter depends on the composition of the initial solution) absorption (bearing) capacity of the sorbent reaches some contained in the brine elements limiting values (calculated theoretically on the original composition). In this case, the Cup (7) saturated with dry sorbent (8) is extracted from the body of the heater (9) and sent for recycling. With the resumed portion of the sorbent (8) the apparatus is again ready to receive the required condensate. To reduce the content of radionuclides in the surface layer of sorbent granules in the case of evaporative capacity (1) provides for the possibility of steaming granules nitric acid.

This device is compact and can be mounted on a transportable platform.

The proposed design has several advantages over known devices:

is obtained in the process of evaporation, the brine is deposited on the sorbent within the same structure with the formation of solid granules, suitable for subsequent disposal;.

- no moving parts;

low intensity, small dimensions, the ability to create mobile units;

- improved thermodynamic characteristics.

The device for processing liquid radioactive waste of low and intermediate level radioactive, containing evaporative capacity, characterized in that the vertically located evaporative capacity, placed inside the annular tank and having in the middle part of the heater, and in the upper part - louvered OTB is iniki, has a closed funnel narrow part of the bottom, the bottom of which is removable glass sorbent placed in the volume of the second heater, and the annular tank having a pipe supply recyclable solutions, coupled with evaporative capacity of the pipe with non-return valve, evaporative capacity of the cover is closed with the connection of the condensate drain.



 

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FIELD: polymer production.

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FIELD: organic chemistry, analytical chemistry, chemical technology.

SUBSTANCE: invention describes a method for concentrating 1-naphthol-5-sulfoacid from aqueous solutions in the presence of ammonium sulfate. Method involves extraction with trioctylamine oxide solution taken in the concentration 0.5 mole/dm3 in toluene medium wherein trioctylamine oxide is impregnated preliminary in polyurethane foam and wherein the mass part of the solution with respect to polyurethane foam is 55-60%, and mass of impregnated tablets changes from 0.093 ± 0.001 to 0.096 ± 0.001 g per 25 cm3 of 1-naphthol-5-sulfoacid an aqueous solution. Extraction is carried out by extractive-sorption method. Under conditions of the complete extraction of 1-naphthol-5-sulfoacid from aqueous solutions the proposed method provides increase of the concentrating coefficient by above 5 times. Invention can be used in concentrating 1-naphthol-5-sulfoacid in analytical control of purified sewage in plants manufacturing dyes.

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2 tbl, 15 ex

FIELD: oil and gas production.

SUBSTANCE: method comprises separating, in a receiving container, acid treatment products into water-in-oil-type reverse oil emulsion and acid-containing water phase. To the latter phase is added demulsifier, notably "Oksifos" in amount 0.1-1.0%. Resulting mix is agitated at temperature not below 20°C for 5-10 min with reverse-type oil emulsion at ratio 3:1 to form direct-type emulsion oil-in-water. This emulsion is settled to separate into essentially waterless oil phase and acid-containing aqueous solution of Oksifos. Oil phase is pumped out into oil-field pipeline and Oksifos solution is neutralized and simultaneously subjected to flotation removal of contaminants therefrom by way of gradually adding 5% aqueous potassium carbonate solution in amount providing achievement of pH value of Oksifos solution equal to that of local natural surface and underground waters. Thus treated Oksifos solution is used as oil-removing liquid. Further adsorption cleaning of neutral aqueous Oksifos solution is also possible by way of filtering the solution through adsorbent to obtain product that may be used as potassium and phosphorus-containing fertilizer or reused being thrown down onto relief in water-diluted state. Adsorbent is made up of a mixture crushed vegetable- and mineral-origin materials taken at 1:1 ratio, wherein vegetable-origin materials could be, in particular, peat, straw, or wood cuttings and mineral-origin materials are selected from clay, sand, or natural soil. Contaminants isolated in above-defined flotation and adsorption cleaning procedures together with work-out adsorbent are mixed with anhydrous calcium oxide at 1:1 ratio and mixed material is then used to cover process areas or to bank wells.

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5 cl, 1 dwg, 4 tbl

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EFFECT: expanded functional capabilities.

1 cl, 9 dwg

FIELD: devices for separation of surface layers of liquids.

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15 cl, 5 dwg

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43 cl, 16 ex, 1 tbl

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3 cl, 1 dwg

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2 dwg

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4 ex

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1 dwg

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