RU56706U1 - PLANT FOR CEMENTING LIQUID RADIOACTIVE WASTE - Google Patents

Abstract

The installation relates to the field of environmental protection, and more specifically, to the field of processing of radioactive waste (RW) by fixing it in a stable solid environment and allows to simplify its maintenance during operation. For this, a cementing unit for liquid radioactive waste containing a receiving tank, a measuring device equipped with mixers, a container with a mixer installed in it, a cement supply unit with additives, is equipped with siphon tubes, with fittings for supplying an oncoming gas stream. The receiving tank and the meter are equipped with nozzles for supplying bubble gas. Siphon tubes are equipped with fittings for supplying an oncoming gas stream to interrupt the LRW jet. 1 ill., 1 wp f-ly.

Description

The utility model relates to the field of environmental protection, and more specifically, to the field of processing of radioactive waste (RW) by fixing it in a stable solid environment.

A device for cementing liquid radioactive waste [RU patent 2132095. B.I. No. 17, 1999] containing a mixing unit consisting of a container with a mixer, a drain device, a vortex device, the input of which is connected to the output of the container with a mixer, and the output with a drain device, LRW supply pipeline, cement hopper, hoppers for solid additives, feeders - dispensers for cement and solid additives, each of which consists of a series-connected jet pump connected to cement and solid waste hoppers, piping ode feed bin and feeders connected to an input capacitance with a stirrer circulation line provided with a pump and connected to the input of a stirred tank.

The disadvantages are:

- clogging of the drain device with a radioactive compound, which leads to the need for periodic replacement;

- the need for periodic cleaning of the mixing unit from the radioactive cement compound;

Closest to the claimed, is an installation for cementing liquid radioactive waste (LRW) [Davydov V.I. et al. Installations for the rejection of liquid wastes of medium and low activity levels, A.E., 1995, vol. 79, issue 6, s.431-432], made of separate blocks and containing a waste collection unit with storage tanks , measuring tanks for LRW and cement, a mixer with a high-speed rotor and a storage container.

The pre-evaporated LRW contained in the storage tanks is fed into the LRW measuring device, cement is loaded into the measuring device, and from both measuring devices designed to fill one container, the contents are fed into a mixer with a high-speed rotor, then the compound is loaded into a container for long-term storage.

The installation has the same disadvantages as the previous analogue, namely:

- clogging of the drain device with a radioactive compound, which leads to the need for periodic replacement;

- the need for periodic cleaning of the mixing unit from the radioactive cement compound;

The disadvantage of this installation is its complexity. The above disadvantages are eliminated by the fact that the cementing unit for liquid radioactive waste contains a receiving tank with a pipeline for LRW supply, a measuring device equipped with mixers, a container with a mixer installed in it, a cement supply unit with additives, siphon tubes, and one siphon tube connects the receiving tank with a dipstick, a second siphon tube is installed with the possibility of connecting the dipstick to the disposal container, the receiving tank and the dipstick are each equipped with at least one nozzle for feeding g for, siphon tubes are equipped with nipples for supplying a gas flow counter. Mernik is also equipped with a pipe for draining excess fluid.

The receiving tank and the meter can contain two nozzles for supplying gas, one of them in the lower part of the receiving tank and a measuring device for supplying bubble gas.

To interrupt the jet with LRW, a counter flow of gas is supplied to the siphon tube.

The use of siphon tubes during the unloading of LRW from the receiving tank and the measuring device, with the possibility of interrupting the LRW stream with an oncoming gas stream, allows the formation of portions of specified volumes and cleans

siphon tube, preventing clogging. The use of siphon tubes when unloading LRW simplifies the device.

When using one pipe in the lower part of the receiving tank and the meter simultaneously with gas bubbling, they create excess pressure, which ensures the entry of LRW into the siphon tube and unloading them into the meter and then into the container.

When using two nozzles, one of them is used for bubbling, the second for creating excess pressure.

The presence of a pipe to remove excess water allows you to get the required ratio of components in the container.

As a rule, compressed air is used for sparging. Installation for cementing liquid radioactive waste is presented in the attached figure, where:

1 - receiving tank with mixer

2 - pipeline supply LRW in the receiving tank

3 - pipe for supplying bubble gas into the receiving tank

4 - pipe for supplying gas to the receiving tank

5 - blowing in the receiving tank

6 - measuring device with a mixer

7 - siphon tube for feeding LRW into the meter

8 - fitting for supplying gas to the siphon tube

9 - pipe for supplying bubbling gas to the meter

10 - pipe to drain excess fluid

11 - pipe for supplying gas to the measuring device

12 - blowing in the measuring device

13 - siphon tube for feeding LRW into the container

14 - fitting for supplying gas to the siphon tube

15 - site supply cement and additives in the container

16 - container

Installation works as follows:

LRW through pipeline 2 is fed into the receiving tank 1, where they are maintained in suspension by means of a mixer and by bubbling through the pipe 3 to supply bubbler air to the receiving tank. In this case, the excess air is removed through the blow-off 5. Then a portion of LRW is supplied using the siphon tube 7 to the measuring device 6, increasing the gas pressure in the receiving tank through the nozzle for supplying bubble gas 3 or the nozzle 4. Then the siphon tube is blown through the nozzle 8 with compressed air. The pressure in the measuring device 6 is increased, and after soaking, if necessary, excess water is removed through the nozzle 10. After that, air for sparging is supplied to the measuring device through the nozzle 9, removing excess air through the blow-off 12. Connect the container 16 to the cement supply unit and additives 15 and by a siphon tube 13. LRW is fed into the container, increasing the pressure in the measuring device through a pipe 9 or 11. After a portion of the LRW is fed into the container, the siphon tube 13 is blown with air through the nozzle 14. When filling the container, it is closed and sent for storage.

Claims (2)

1. Installation for cementing liquid radioactive waste, containing a receiving tank with a pipeline for supplying LRW, a measuring device equipped with mixers, a container with a mixer installed in it, a cement supply unit with additives, siphon tubes, and one siphon tube connecting the receiving tank with a measuring device, the second siphon tube is installed with the possibility of connecting the measuring device to the container, the receiving tank and measuring device are each equipped with at least one pipe for supplying gas, the siphon tubes are equipped with fittings for supplying gas, and m The cranberry is also equipped with a nozzle for draining excess fluid. 2. Installation according to claim 1, characterized in that the receiving tank and the measuring device contain two nozzles for supplying gas, one of them in the lower part of the receiving tank and measuring device for supplying bubbling gas.