RU2249868C1 - Sediment washout and decontamination device - Google Patents

Abstract

FIELD: decontamination engineering.

SUBSTANCE: proposed device has side pipe connection, working liquid feed chamber, drive shaft, and washing head with nozzle. Working liquid feed chamber that has drive shaft and washing head pipe union, both passed therein through packing assemblies, is mounted directly inside storage tank by means of pipeline joined with side pipe connection. Drive shaft is coupled through movable bearing assembly with nozzle tilt angle varying mechanism. It is also coupled through slotted joint, toothed gear, and toothed rack with nozzle turning mechanism mounted on washing head axle and through hinged link ,to external adjustable ring of bearing disposed on packing assembly.

EFFECT: enhanced reliability and safety in operation.

3 cl, 3 dwg

Description

The invention relates to the nuclear industry in terms of processing radioactive waste, and in particular to devices for jet erosion of sediment accumulated in containers - storage of radioactive waste of a high level of activity. The invention can simultaneously serve for the decontamination of the inner surfaces of the tank and for the transfer of this precipitate in suspension with a view to its further extraction for processing.

A known design of a washing device for washing away sediment and decontamination of containers - storage of radioactive waste, containing a housing with a nozzle for supplying a decontamination solution, a chamber for supplying liquid for washing away the sediment and a nozzle orientation device (see Copyright certificate No. 1387731, class G 21 F 9/34, 1986).

The disadvantages of the known device described above are that this device, when operating both in sediment erosion mode at the bottom of the tank and in decontamination mode, can only uniformly spray the entire surface with jets. Since storage tanks are mainly underground tanks with a diameter of 12 to 35 meters, then, of course, there is a need for erosion of sediment and decontamination of certain places of the tank, which cannot be performed by the indicated device. The design of the nozzle orientation device does not provide a sufficient degree of reliability, because if eroded, splashes of liquid with an insoluble solid phase (sand) can cause the gear to jam.

The closest device of the same purpose to the claimed invention in terms of features is a device (see application No. 2002101861 A, G 21 F 9/00, publ. 08/10/2003).

SUBSTANCE: device for washing out sediment and decontamination contains a housing, a chamber, a pulse line, a rotation drive, a bearing support, upper and lower washing heads with nozzles, which are connected via a discharge pipe to a working fluid supply chamber equipped with an inlet valve. The device is also equipped with an air distributor, a drive shaft, a rod and compressed air and water pipelines placed inside the bearing support. On the lower part of the drive shaft mounted movably through the seal in the upper discharge pipe, an upper washing head with a nozzle is mounted on the axis, to the housing of which a rod is pivotally connected. The lower end of the rod is mounted in a bearing mounted on the upper discharge pipe. On top of the drive shaft is mounted in a movable bearing assembly attached to the actuator with a reciprocating motion of the rod, and the assembly is mounted on a spline connection inside the gear wheel meshed with the rotation drive gear.

Using the specified device is not effectively removed sediment from surfaces. In addition, a large amount of liquid radioactive waste is generated.

The objective of the invention is to reduce the volume of the working fluid, and, as a consequence, to reduce the volume of liquid radioactive waste and increase the degree of radiation safety.

The technical result that can be obtained by carrying out the invention is to expand the functionality of the proposed device, to increase the efficiency, reliability and safety of its operation.

The specified technical result is achieved in that in the device for sludge washing and decontamination, including a side pipe, a working fluid supply chamber, a drive shaft, a washing head with a nozzle, a feature is that, using a pipe connected to the side pipe, a working fluid supply chamber , including the drive shaft and the nozzle of the washing head installed through the seal nodes, arranged coaxially and connected by ribs, mounted directly inside the storage tank, and aqueous shaft is connected via a movable bearing assembly driven change in the angle of inclination of the nozzle, and through the splined coupling, toothed gear and the rail - with rotation drive of the nozzle, which is mounted on the axis of the washing head and connected to the hinge rod with a rotary bearing outer ring disposed in the seal assembly.

Given the special operating conditions, the device,

firstly, it differs in that it contains a remote control system consisting of a personal computer, a microcontroller, a communication modem, and software;

secondly, the device is characterized in that the mechanisms with reciprocating motion of the rods equipped with positioners are used as drives.

Placing the chamber for supplying the working fluid inside the tank and connecting it to the side pipe nozzle allows the use of a circulating solution for sediment erosion, removal of deposits from the walls and primary decontamination, thereby reducing the volume of the working fluid, and, as a result, the volume of liquid radioactive waste.

The fact that the drive shaft is installed in the chamber for supplying the working fluid through the seal assemblies, is coaxially connected by ribs with the nozzle of the washing head, on the axis of which a nozzle is mounted, pivotally connected to the outer ring of the bearing mounted on the lower assembly of the chamber seal, and also that the drive shaft through the movable node is connected to the drive for changing the angle of inclination of the nozzle, and through a spline connection, gear gear and rack - with the drive for turning the nozzle - all this allows you to change the angle of inclination of the nozzle in a vertical plane and suschestvlyat nozzle rotation in a horizontal plane that directs the working fluid stream at any desired point capacitance and improves the efficiency of the entire device.

The presence of a control system in the device, including a personal computer, a microcontroller, communication modems and software, allows remote control of the device, orientation of the nozzle in the necessary direction and its movement in continuous or discrete mode, which allows to increase the level of radiation safety and the efficiency of the device due to the rational use of working fluid.

The use of rods equipped with positioners as drives with reciprocating motion allows one to obtain high accuracy of nozzle orientation in the tank and, therefore, increase its efficiency.

Figure 1 shows a device for erosion of sediment and decontamination, placed in the tank.

Figure 2 shows the area of connection of the shaft and the fitting.

Figure 3 shows a section aa of the device.

The device comprises a chamber 1 for supplying a working fluid connected by a pipe 2 to a side nozzle 3. On the chamber 1, the upper 4 and lower 5 seal assemblies are mounted coaxially. A shaft 6 is placed through the upper seal assembly 4 in the chamber 1, and the nozzle 7 of the washing head 8 is placed through the lower seal assembly 5.

The shaft 6 and the nozzle 7 are interconnected by ribs 9. On the axis 10 of the washing head 8, a nozzle 11 is mounted, connected by an articulated rod 12 with the outer ring of the bearing 13 mounted on the lower assembly of the seal 5.

Sealing units 4 and 5 are made of antifriction materials and also serve as sliding bearings for shaft 6 and fitting 7.

The shaft 6 is suspended on a movable bearing assembly 14, which is connected to the actuator 15 for changing the angle of inclination of the nozzle 11 equipped with a positioner 16. A gear 17 is mounted on the shaft 6 on the spline connection, which is engaged with the gear rack 18 connected to the drive 19, equipped with a positioner 20 and serving to turn the nozzle 11.

The device is mounted on a mounting flange 21 mounted on a flange of a penetration 22 in a storage tank 23.

The proposed device operates as follows.

The device is installed in the storage tank 23, leaning on its mounting flange 21 on the flange of the penetration 22. The side pipe 3 is connected to both the pipeline for supplying fresh working fluid and to a pump installed in the storage tank, providing the supply of circulating working fluid.

The working fluid supplied through the side pipe 3 through the pipe 2 enters the working fluid supply chamber 1, and then, through the cavities between the ribs 9 connecting the shaft 6 and the fitting 7, the working fluid enters the washing head 8 and the nozzle 11.

The necessary change in the angle of inclination of the nozzle in the vertical plane is made by the positioner 16, with the help of which the required value of the extension of the actuator rod 15, shaft 6 and the nozzle of the washing head 8 is sequentially set. The nozzle 11 mounted on the axis 10 during vertical movement of the washing head 8 and under the influence of the hinge traction 12 rotates in a vertical plane.

The rotation of the nozzle 11 in the horizontal plane is as follows. The positioner 20 provides the necessary extension of the actuator rod 19 and the gear rack 18 connected to it, which is meshed with the gear 17, which through the spline connection rotates the shaft 6, suspended in the movable bearing assembly 14, to the required angle around its axis.

Since the shaft 6 is rigidly connected to the washing head 8, the latter also rotates around the axis together with the articulated rod 12 and the outer ring of the bearing 13 mounted on the lower assembly of the seal 5.

When adding the movements of the nozzle 11 from the actuators 15 and 19, it can be directed to any point in the tank.

As actuators, linear electric straight-through (MEP) mechanisms or pneumatic cylinders with positioners can be used to control the speed of the rods and stop them in a given position. Drives are controlled remotely by a computer control system. An electrical signal from a personal computer is fed to a programmable microcontroller, and then either to electric air distributors that supply compressed air to pneumatic cylinders, or to a relay that supplies voltage to linear electric mechanisms. The presence of a computer control system allows not only to change the nozzle direction with the mouse pointer on the computer monitor, but also to carry out its continuous or discrete movement in the program.

Thus, the device can be effectively used for erosion of sediment and disinfection of the surface from radionuclides. When using it, an increase in the degree of radiation safety is achieved and a small amount of liquid radioactive waste is generated.

Claims (3)

1. A device for washing away sludge and decontamination, comprising a side pipe, a fluid supply chamber, a drive shaft, a washing head with a nozzle, characterized in that by means of a pipe connected to the side pipe, a fluid supply chamber including the drive fluid installed through the seal assemblies the shaft and the nozzle of the washing head, arranged between themselves coaxially and connected by ribs, are mounted directly inside the storage tank, and the drive shaft is connected through a movable bearing assembly with Odom nozzle inclination angle changes, and through a splined coupling, gear and gear rack - driven rotation of the nozzle, which is mounted on the washing head and the axis of the hinge rod is connected with the rotary bearing outer ring disposed in the seal assembly. 2. The device according to claim 1, characterized in that it contains a control system including a personal computer, a microcontroller, communication modems and software. 3. The device according to claim 1, characterized in that the actuators use mechanisms with reciprocating motion of the rods and their positioning.

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