EA041117B1 - METHOD FOR DEACTIVATION OF CONTAMINATED EQUIPMENT OF METAL PRODUCTS AND DEVICE FOR ITS IMPLEMENTATION - Google Patents

Description

Technical area

The invention relates to the field of decontamination of metal surfaces of objects with radioactive deposits.

Prior Art

It is known Device and method for cleaning metal surfaces from radioactive contamination RU 2169404 [1], containing a container filled with liquid to accommodate the object being cleaned and a source of pulsed exposure, equipped with an electrode system connected to a source of high voltage pulses. The disadvantages of the known design are low efficiency and environmental friendliness due to high water consumption. The closest to the claimed technical solution is the Method of spark-arc decontamination of metal surfaces with a closed water supply cycle RU 2172992 [2], the Method of decontamination of metal surfaces, in which water is supplied to the decontaminated surface, electro-hydraulic shocks are carried out in water due to pulsed spark-arc discharges, which are created in water by extinguishing the discharge, the water is pumped out by a pump, cleaned of radioactive particles and metal salts dissolved in it and returned to the decontamination zone, the decontamination process is carried out in the working tank. The known method is more environmentally friendly and economical, since it involves the use of a closed water cycle. The disadvantage of this method is reduced economy, environmental friendliness and efficiency due to the need to use a large working capacity.

Brief summary of the invention

Electrohydropulse installation allows cleaning (decontamination) of metal products of complex geometry to comply with sanitary standards NRB-99/2009 (SanPiN 2.6.1.2523-09) by means of an electric discharge of shock waves in a liquid (water). Shock waves, acting on deposits on the surface of the object being cleaned, lead to their destruction with subsequent ejection from the impact zone. Waste is collected in special packages with subsequent certification of RW and transfer of packages for placement at radioactive waste storage facilities to a specialized organization. Technical task

The task to be solved by the claimed invention is to implement a technology that meets modern requirements for safety, energy saving, durability, ease of transportation, installation and operation. The technical result of the invention is to increase the economy, environmental friendliness, efficiency.

The solution of the problem

The technical result is achieved by the fact that the method of decontamination of metal surfaces, in which water is supplied to the decontaminated surface, electro-hydraulic shocks are carried out in water due to pulsed spark arc discharges (which are created in water by extinguishing the discharge), the water is pumped out with a pump, cleaned of radioactive particles dissolved in it and metal salts and returned to the decontamination zone, the decontamination process is carried out in a working tank (with a single water area), the bottom of which is made with at least two sections (sections, sectors) of different depths (the bottom of each section is located at a level different from the neighboring section in depth). The device for decontamination of contaminated metal products, contains a working container, an electric discharger, a water collector, a pump, a filter, characterized in that the bottom of the working container is made with at least two sections with different (from each other) depth.

Positive effects of the invention

Increasing the economy, environmental friendliness, efficiency is achieved by the fact that the processing of large parts of complex shape can be carried out with a relatively small volume of water, which will reduce the pump power and its energy consumption.

Brief description of the figures

In FIG. 1 shows a longitudinal section of the working container;

n a fig. 2 - top view of the working tank;

n a fig. 3 - cross section of the shallow section;

n a fig. 4 - cross section of the middle section;

n a fig. 5 - cross section of the deep-sea section;

n a fig. 6 - bunker wall;

n a fig. 7 - section of a deep bath;

n a fig. 8 is a top view of the installation mounted in a transport container;

n a fig. 9 - longitudinal section of the installation, mounted in a shipping container;

n a fig. 10 is a cross section of the installation mounted in a transport container, where 1 is the deep-water section of the working tank;

- the middle section of the working capacity;

- shallow section of the working tank;

- support racks of the working tank;

- partition between the middle and deep sections;

- partition in the deep section;

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- water removal fitting;

- bunker;

- deep bath;

- electric discharger;

- metal container;

- monorail with hoist;

- a water collector with a pump with a filter.

Description of Embodiments

In the working tank, partitions can be installed between sections with different depths, and the partitions have cutouts in the upper part, the width and depth of the cutout correspond to the width and depth of the shallowest part of the tank, the bottom of which is made flat, the bottom of the deep sections of the working tank is profiled, in each lower most deep part of the bottom there is a fitting (with a tap for draining liquid). The number of sections of the working tank can be three, the sections are located along the main line, and the deepest section is located on the opposite side of the shallowest section. The working tank, electric discharger, water collector, pump, filter can be attached to the inside of the metal container, which will increase the mobility of the device.

Examples

The device operates as follows. In the working tank - a metal bath, in which the process of cleaning (decontamination) of the equipment takes place, water is supplied using a submersible pump installed in the tank. Water from the bath drains by gravity through the filtration mesh, which is part of the filter, into the tank. The working container has several compartments of different depths 1, 2, 3 and, depending on the size of the metal products, it is possible to use one of the compartments that best suits the dimensions of the metal products. The pump for water supply installed in the water collector - reservoir 13 belongs to the submersible pumps with the Prima grinding system of the NRF series. The pump body is divided into two parts: the pump part and the motor part. In the pump part there is an impeller fixed on the shaft of the electric motor rotor. At the bottom of the pump part there are suction holes for mechanical filtration of the pumped water. A special heat exchange chamber provides cooling of the electric motor and allows the pump to work for a long time. To prevent the formation of an air lock in the pump housing there is an air valve. Degree of protection of the pump IP68. In terms of protection against electric shock, the pump belongs to class I. The working tank consists of three sections of different depths, walls, partitions 5 and 6, support posts 4 with heels, pipes, jumpers, plugs. This design allows you to choose the optimal part of the bath, in which cleaning will be carried out in accordance with the size of the product to be cleaned. Water using a hose coming from a submersible pump can be supplied immediately to any part of the bath, depending on the tasks. In the middle and deep sections of the working tank, it is possible to drain water or supply it to the tank with subsequent return through the submersible pump back to the bath. Such a mechanism is carried out with the help of water removal fittings 7 and 3/4 inch ball valves installed in the middle and deep parts of the working tank. Partition 5 shown is installed between the middle and deep sections of the working tank. Partition 6 is installed in the middle of the deep part of the bath. This arrangement of partitions allows optimal use of the water that returns from the submersible pump, and also allows you to immerse several products in one working tank. Water from the working tank flows by gravity into the tank. To clean it, the bath includes a filter.

With a large amount of sludge formed during cleaning, a separate bunker element 8 is provided for its collection. The bunker consists of a body, a filter, walls, legs, jumpers, pipes, feet and plugs. For the free passage of water with sludge from the bath into the bunker, the bunker design provides for a wall having the shape shown in Fig. 6. For the possibility of draining water or returning water to the tank, the design of the bunker provides for two water removal fittings and two ball valves. One ball valve is located at the bottom of the hopper, the other side ball valve is used to drain water when a large amount of sediment accumulates. Also, the hopper can be used for cleaning products that are suitable in terms of geometric parameters.

In a separate layout, a deep bath 9 is made for cleaning large metal products. A deep bath consists of a body, walls, lintels, pipes, a filter, legs, heels, plugs. The bathtub is equipped with two 3/4 inch ball valves. Ball valves are designed to drain water. One ball valve is located at the bottom of the deep bath, the other side ball valve is used to drain water when a large amount of sediment accumulates in the bottom of the deep bath. Also, ball valves can be used to supply water to the tank, which returns to the deep bath through a submersible pump. A tank with a pump and filter 12 collects water from all parts of the bath, as well as from the bunker and deep bath. Further, with the help of a submersible pump, water is returned, depending on the tasks, to any part of the bath or deep bath.

The operation of the device is as follows. Water from an external source is poured into

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Claims (5)

the necessary department of the working container or a deep bath. The products to be cleaned are fed by means of a hoist 12 fixed on a monorail in the upper part of the metal container 11 and are cleaned using an electric discharger 10 - a device for pulsed electric arc discharges. During the operation of the EGIO unit and the cleaning of the product, water flows through the filtration mesh with open ball valves and connecting hoses into a reservoir that serves as a water collector. Further, water, passing through the tank filter with the help of a submersible pump, is fed back into the metal bath through the connecting hoses from the pump. During this cycle, water undergoes a four-stage purification: 1. A method for decontaminating contaminated metal products, in which water is supplied to the surface to be decontaminated, electro-hydraulic shocks are carried out in water due to pulsed spark arc discharges, water is pumped out, cleaned of radioactive particles and metal salts dissolved in it and returned to the decontamination zone, characterized in that that the decontamination process is carried out in a working tank, the bottom of which is made with at least two sections of different depths. 1 - deep-water section of the working tank; 1) with the help of filter meshes installed in the bath and deep bath; 2. A device for decontamination of contaminated metal products, containing a working container, an electric discharger, a water collector, a pump, a filter, characterized in that the bottom of the working container is made with at least two sections with different depths. 2 - middle section of the working tank; 2) using the filter system of the tank; 3. The device according to claim 2, characterized in that partitions between sections with different depths are installed in the working tank, and the partitions have cutouts in the upper part, the width and depth of the cutout corresponds to the width and depth of the shallowest part of the tank, the bottom of which is made flat, the bottom the deep sections of the working tank are profiled, in each lower deepest part of the bottom there is a fitting. 3 - shallow section of the working tank; 3) using a submersible pump, which also performs mechanical filtration of pumped water; 4. The device according to claim 3, characterized in that the number of sections of the working tank is equal to three, the sections are located along the main line, and the deepest section is located on the opposite side of the shallowest section. 4 - support racks of the working tank; 5 - partition between the middle and deep sections; 6 - partition in the deep section; 7 - water removal fitting; 8 - bunker; 9 - deep bath; 10 - electric discharger; 11 - metal container; 12 - monorail with hoist; 13 - water collector with a pump with a filter. Patent Literature Patent Literature 1: RU 2169404; Patent Literature 2: RU 2172992. CLAIM 4) in case of excessive formation of sludge on the water surface, in the working parts of the bath there is a possibility for driving the sludge into the bunker. After finishing work on cleaning products, water with open ball valves in the working parts of the bath is driven into water tanks, and from the tank water is driven into tanks using a submersible pump. Industrial Applicability Thus, the claimed design and technology of water treatment allows you to quickly and efficiently pump water used as a working medium for cleaning products, while the process of mechanical water purification is carried out without unnecessary loss of heat energy while ensuring the necessary safety. The invention can be successfully applied to devices for cleaning and decontamination of metal surfaces of objects with radioactive deposits. List of reference symbols 5. The device according to claim 3, characterized in that the working container, electric discharger, water collector, pump, filter are attached to the inside of the metal container. -