NL2037506B1

NL2037506B1 - Mobile device for treating intermediate-level and low-level solid radioactive wastes

Info

Publication number: NL2037506B1
Application number: NL2037506A
Authority: NL
Inventors: Wang Dongyu; Zhao Kun; Zhu Yongchang; Yue Hanwei; Zhao Yongxiang; Jiao Yunjie; Dong Xuanjiang; Yang Debo; Du Zhanyuan; Guo Jianfeng; Cui Zhu
Original assignee: China Building Mat Academy Co Ltd; China Nat Building Material Group Co Ltd
Priority date: 2024-02-21
Filing date: 2024-04-21
Publication date: 2025-08-26
Also published as: CN117995448A

Abstract

U I T T R E K S E L The present invention provides a mobile device for treating intermediate—level and low—level solid radioactive wastes, which relates to the field of nuclear waste treatment. The mobile device for treating intermediate—level and low—level solid radioactive wastes includes a supporting member and a cement fixing system, where the cement fixing system is arranged on the supporting member, and when the supporting member has a housing—like structure, the cement fixing system is arranged in the housing. The cement fixing system includes a mixing system and a pumping system, the pumping system is in communication with the mixing system, the mixing system is configured to make paste, and the pumping system is configured to pump the paste in the mixing system into a packaging assembly. The mobile device can be transferred to a required work place by a transport device. (+ Fig. l)

Description

MOBILE DEVICE FOR TREATING INTERMEDIATE-LEVEL AND LOW-LEVEL SOLID

RADIOACTIVE WASTES

TECHNICAL FIELD

The present invention relates to the field of nuclear waste treatment, in particular to a mobile device for treating interme- diate-level and low-level solid radioactive wastes.

BACKGROUND ART

Intermediate-level and low-level solid radioactive wastes are common in the field of nuclear facility operation and decomnis- sioning, and cement immobilization is one of the most commonly used methods. Generally speaking, the treatment of this kind of wastes has distinct localization characteristics: (1) nuclear pow- er plant. Because the nuclear power plant is in production for a long time, a cement fixing treatment system for this kind of wastes is often specially established on the nuclear island or the conventional island, which can ensure the timely treatment of wastes and reduce the transportation risk and cost. (2) Post- treatment plant. Spent fuel and its components produced by nuclear power plant are often transported to post-treatment plant for treatment. Considering the continuity of nuclear power plant pro- duction, a cement fixing treatment system is specially built in the post-treatment plant to fix solid wastes.

However, for other nuclear-related industries (such as miner- al areas, experimental bases, radicactive medical institutions, and research institutes), it is of no practical significance to establish a cement fixing system in the above areas because inter- mediate-level and low-level solid radioactive wastes are far from the scale of nuclear power plant and post-treatment plant. At pre- sent, the nuclear industry is developing in an all-round way in

China, and the above-mentioned phenomena of intermediate-level and low-level solid radioactive wastes in multiple batches, small vol- ume and poor regicnal concentration sometimes exist. Long-term storage of this kind of wastes has the risk of leakage of radicac-

tive materials, and the cement fixing system with huge system is not only low in quality and economy, but also has the problem of subsequent decommissioning even if the cement fixing system is built.

SUMMARY

An objective of the present invention is to provide a mobile device for treating intermediate-level and low-level solid radio- active wastes, so as to solve the problems existing in the prior art, realize flexible treatment of intermediate-level and low- level solid radioactive wastes with small batch, small variety and poor regional concentration, and reduce storage risks and a treat- ment cost of such wastes.

In order to achieve the above objective, the present inven- tion provides the following solution:

The mobile device for treating intermediate-level and low- level solid radioactive wastes is provided by the present inven- tion and includes a supporting member and a cement fixing system, the cement fixing system is arranged on the supporting member, and when the supporting member has a housing-like structure, the ce- ment fixing system is arranged in the housing. The cement fixing system includes a mixing system and a pumping system, the pumping system is in communication with the mixing system, the mixing sys- tem is configured to make paste, and the pumping system is config- ured to pump the paste in the mixing system into a packaging as- sembly. The mobile device may be transferred to a required work place by a transport device.

Preferably, the supporting member is a box body, and the ce- ment fixing system is arranged in the box body.

Preferably, the cement fixing system further includes a mate- rial bin and a water pumping system, the material bin is config- ured to accommodate dry materials, the water pumping system is configured to pump water to the mixing system, a conveying device is arranged between a discharge port of the material bin and a feed port of the mixing system, and the conveying device is con- figured to convey the dry materials to the mixing system.

Preferably, the cement fixing system further includes an emergency system, the emergency system is configured to convey an emergency solution into the mixing system, and the emergency sys- tem is started when the paste in the mixing system is viscous.

Preferably, the cement fixing system further includes a sec- ondary storage system, the secondary storage system is connected in series between the mixing system and the pumping system, and the emergency system is further configured to convey the emergency solution to the secondary storage system.

Preferably, the pumping system includes a paste pump, an in- let of the paste pump is in communication with a discharge port of an superior system, an outlet of the paste pump is in communica- tion with a discharge pipe, a flow limiting valve is arranged on the discharge pipe, and a tail end of the discharge pipe is in communication with a hose.

Preferably, the mixing system is a planetary or forced mixer, and includes a mixing tank, a mixing shaft and mixing blades, the emergency system is in communication with an internal space of the mixing tank by means of two spray heads, the two spray heads are located in the mixing tank, one faces the mixing shaft, and the other faces an inner wall of the mixing tank.

Preferably, the cement fixing system further includes a cen- tral control system, and the central control system determines whether the paste carried by each is viscous according to real- time power and current data of a mixing electric motor in the mix- ing system.

Preferably, the secondary storage system includes a first storage bin and a second storage bin, the first storage bin is lo- cated above the second storage bin, a top of the first storage bin is provided with a liquid level controller, when the paste in the first storage bin flows to 3/5 of own volume or height, a dis- charge port at a bottom thereof is opened, and the paste flows in- to the second storage bin.

Preferably, the cement fixing system is controlled to work by remote control and is provided with video monitoring.

Compared to the prior art, the present invention has the fol- lowing technical effects:

According to the present invention, the cement fixing system required by a cement fixing process is integrally arranged on the supporting member, such that the cement fixing system has road transportation conditions and may flexibly treat the intermediate- level and low-level solid radioactive wastes in different regions.

The problems of high difficulty and a high cost in treating a small amount of radioactive wastes are solved.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to describe the examples of the present invention or the technical solutions in the prior art clearer, and the accompa- nying drawings required by the examples are briefly described be- low. Obviously, the accompanying drawings in the following de- scription show merely some examples of the present invention, and a person of ordinary skill in the art would also be able to derive other accompanying drawings from these accompanying drawings with- out creative efforts.

FIG. 1 is a schematic structural diagram of a mobile device for treating intermediate-level and low-level solid radioactive wastes provided by an example of the present invention; and in the figure: 1-box body; 2-material bin; 3-conveying de- vice; 4-mixing system; 5-water storage tank; 6-emergency solution storage tank; 7-packaging assembly; 8-paste pump; 9-second storage bin; 10-first storage bin; 11-emergency solution pump; 12-flow limiting valve; 13-flow controller.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The technical solution in the examples of the present inven- tion is clearly and completely described below with reference to the accompanying drawings in the examples of the present inven- tion. Apparently, the described examples are some rather than all of the examples of the present invention. Based on the examples of the present disclosure, all the other examples obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

In order to make the above objective, features and advantages of the present disclosure clearer and more comprehensible, the present disclosure will be further described below in detail with reference to the accompanying drawings and particular embodiments.

As shown in FIG. 1, a mobile device for treating intermedi- ate-level and low-level solid radioactive wastes is provided by an example of the present invention and includes a supporting member 5 and a cement fixing system, the cement fixing system is arranged on the supporting member, and when the supporting member has a housing-like structure, the cement fixing system is arranged in the housing. The cement fixing system includes a mixing system 4 and a pumping system, the pumping system is in communication with the mixing system 4, the mixing system 4 is configured to make paste, the pumping system is configured to pump the paste in the mixing system 4 into a packaging assembly 7, the packaging assem- bly 7 may be a steel drum or a steel box, etc., and before pouring cement, the steel drum or the steel box is filled with intermedi- ate-level and low-level solid radioactive wastes. The mobile de- vice may be transferred to a required work place by a transport device.

The cement fixing system is not limited to the above two as- semblies, but may also include assemblies with reference to the following examples.

When in use, the whole device may be transported by a transport apparatus, such as vehicles. According to examples of the present invention, assemblies required by a cement fixing pro- cess are integrally arranged on the supporting member, such that the cement fixing system has road transportation conditions and may flexibly treat the intermediate-level and low-level solid ra- dicactive wastes in different regions. The problems of high diffi- culty and a high cost in treating a small amount of radioactive wastes are solved.

In order to play a protective role and improve integrity of the device, in some examples, the supporting member is a box body 1, and the cement fixing system is arranged in the box body 1.

Specifically, the box body 1 may be a container, and specification of the container may be 1AAA or 1BBB, which may be purchased di- rectly from a market without self-making. After purchase, a door may be opened at a side part and/or a tail as required. It may be understood that when the special box body 1 is needed, the box body may be self-made according to own requirements.

In some examples, the cement fixing system further includes a material bin 2 and a water pumping system, the material bin 2 is configured to accommodate dry materials, the water pumping system is configured to pump water to a mixing system 4, a conveying de- vice 3 is arranged between a discharge port of the material bin 2 and a feed port of the mixing system 4, and the conveying device 3 is configured to convey the dry materials to the mixing system 4.

In the present example, the material bin 2 and a water stor- age tank 5 in the water pumping system are configured to store raw materials needed for making the paste.

Specifically, the conveying device 3 is preferably a Z-shaped conveyor, and the material bin 2 is preferably arranged at a tail of the box body 1 and eccentrically placed, such that a small crane may be placed on one side. A top cover and a side door of the material bin 2 may be opened and closed by air pressing, and a middle part of the top cover is provided with a hole with hole di- ameter to accommodate up-and-down movement of an electric hoist hook. A backpack dust collector is arranged inside the material bin 2. A star-shaped cutter is arranged at a position close to a bottom of the material bin 2, an end portion of the cutter is fix- edly connected to an inner wall of the material bin 2, the cutter goes up along an included angle which is greater than or equal to 45 degrees with a horizontal plane, and converges at a vertex, a lower part of the cutter is provided with a screen (pore size less than or equal to 15 mm), and the lowest part of the material bin 2 is provided with a planetary discharge valve, which is connected to the Z-shaped conveyor by means of a buckle. In order to prevent flying dust, the buckle is a composite sleeve.

When in use, a cement bag outside the box body 1 is lifted into the material bin 2 by the small crane, and is lowered onto the cutter, such that a bag body is cut by the cutter, and dry ce- ment is scattered, and an empty cement bag is hoisted out, which increases convenience of feeding without manual feeding.

In some examples, the cement fixing system further includes an emergency system, the emergency system is configured to convey an emergency solution into the mixing system 4, and the emergency system is started when the paste in the mixing system 4 is vis- cous.

In examples of the present invention, when the paste is vis- cous, the solution of delivering the emergency solution into the mixing system 4 with the emergency system is used to reduce possi- bility of damage to the mixing system 4 caused by an abnormal paste state due to environmental changes and irresistible fluctua- tions of raw materials such as the cement.

Whether the paste is viscous may be determined manually or by the central control system, when determination is performed by the central control system, the central control system determines whether the paste carried by each is viscous according to real- time power and current data of a mixing electric motor in the mix- ing system 4. In order to realize automatic determination, it is necessary to find out relationship between the real-time power and the current data of the electric motor and the paste consistency in advance, and a specific finding method may be experiment or em- pirical determination. Specifically, when the paste consistency reaches a certain level, the real-time power and the current data of the mixing electric motor show different sizes from other con- sistency, which may be used as a basis to determine the paste con- sistency.

In some examples, the cement fixing system further includes a secondary storage system, the secondary storage system is connect- ed in series between the mixing system 4 and the pumping system, and the emergency system is further configured to convey the emer- gency solution to the secondary storage system. The present exam- ple is a preferred example, secondary storage system is configured to temporarily store the paste mixed by the mixing system 4, so as to improve continuity of work.

In some examples, the pumping system includes a paste pump 8, an inlet of the paste pump 8 is in communication with a discharge port of an superior system, an outlet of the paste pump 8 is in communication with a discharge pipe, a flow limiting valve 12 is arranged on the discharge pipe, a tail end of the discharge pipe is in communication with a hose, and the packaging assembly 7 is filled with the paste by means of the hose.

In the present example, the paste pump 8 is configured to pump the paste. The pumped paste is controlled by the flow limit- ing valve 12 and then injected into the steel drum or steel box by means of the hose.

In some examples, a flow controller 13 is arranged on the discharge pipe.

In the above two examples, the flow controller is configured to avoid the barrel-overflowing problem of the packaging assembly 7, that is, the steel barrel or the steel box, such that the po- tential safety hazard of radioactive material leakage is reduced.

In some examples, the mixing system 4 is a planetary or forced mixer, and includes a mixing tank, a mixing shaft and mix- ing blades, the emergency system is in communication with an in- ternal space of the mixing tank by means of two spray heads, the two spray heads are located in the mixing tank, one faces the mix- ing shaft, and the other faces an inner wall of the mixing tank.

Specifically, the spray heads are preferably cavitation nozzles, a linear rate of material flow at the mixing shaft is the smallest, and mixing efficiency is the lowest. A linear rate of a side wall of the mixing tank is the largest, and force on the mixing shaft is the largest. Obviously, the positions of the mixing shaft and the inner wall of the tank require a greater reduction in mixing resistance at this stage. Therefore, in the present example, the two spray heads are aimed at the mixing shaft and the mixing tank separately to solve the above problems.

In some examples, a top of the mixing tank is provided with a radar liquid level detector, which facilitates monitoring of paste volume in the mixer.

In some examples, the secondary storage system includes a first storage bin 10 and a second storage bin 9, the first storage bin 10 is located above the second storage bin 9, a top of the first storage bin 10 is provided with a liquid level controller, when the paste in the first storage bin 10 flows to 3/5 of own volume or height, a discharge port at a bottom thereof is opened, and the paste flows into the second storage bin 9. The first stor- age bin 10 and the second storage bin 9 are connected and in com- munication with each other by means of a flange and a rubber gas-

ket.

According to the examples of the present invention, secondary paste storage, that is, an interlocking manner is used, such that the problem that coming out in a paste discharging stage is solved, and the emergency system matching the secondary storage system further reduces the risk of the abnormal paste state.

As shown in FIG. 1, the emergency system may specifically in- clude an emergency solution storage tank 6, an emergency solution pump 11, and a flow meter and a valve on a pipeline.

In some examples, the cement fixing system is controlled to work by remote control and is provided with video monitoring.

Specifically, a control module is controlled by a PLC, remote control and video control. A control range of the PLC is all kinds of valves, flowmeters, central control systems, water, electrici- ty, gas and cranes. As a safety guarantee, the remote control is mainly controlled by field workers, and a control objective there- of is to prevent the paste from coming out of the steel drum and steel box, such that a main control scope thereof is an electro- magnetic valve behind the paste pump 8 and the second storage bin 9. The video monitoring is mainly set at an upper part of a side door of the material bin 2 and a discharge port of the mixer, which is configured to monitor discharge of the dry materials and seal a discharge pipeline.

More specifically, the means of remote control is to control by means of a remote controller, and the remote controller is pro- vided with a corresponding control knob and/or button, etc.

The principles and embodiments of the present invention are described by applying specific examples in the present invention, and the description of the above examples is merely used for as- sisting in understanding the method and the core ideas of the pre- sent invention. Moreover, based on the concept of the present in- vention, a person of ordinary skill in the art will make amend- ments to the particular embodiments and the application scope. In conclusion, the content of the description should not be inter- preted as limiting the present disclosure.

Claims

CONCLUSIONS

1. A mobile apparatus for treating medium and low level solid radioactive waste, comprising a supporting member and a cement fixing system, the cement fixing system being disposed on the supporting member, and when the supporting member has a housing-like structure, the cement fixing system is disposed in the housing; the cement fixing system comprises a mixing system and a pumping system, the pumping system being in communication with the mixing system, the mixing system being configured to make paste, and the pumping system being configured to pump the paste in the mixing system into a packaging assembly, the mobile apparatus being conveyed to a desired working site by a conveying device.

2. A mobile plant for treating medium and low level solid radioactive waste as claimed in claim 1, wherein the supporting member is a box body and the cement fastening system is provided in the box body.

3. The mobile plant for treating medium and low level solid radioactive waste as claimed in claim 2, wherein the cement fixing system further comprises a material hopper and a water pumping system, the material hopper being configured to receive dry materials, the water pumping system being configured to pump water to the mixing system, a conveying device being disposed between a discharge port of the material hopper and a supply port of the mixing system, and the conveying device being configured to convey the dry materials to the mixing system.

4. The mobile facility for treating medium and low level solid radioactive waste as claimed in claim 1, wherein the cement fixing system further comprises an emergency system, the emergency system being configured to provide an emergency solution to the mixing system

to transport the tem, and the emergency system is started when the paste in the mixing system is viscous.

5. A mobile facility for treating medium and low level solid radioactive waste as claimed in claim 4, wherein the cement fixing system further comprises a secondary storage system, the secondary storage system being connected in series between the mixing system and the pumping system, and the emergency system being further configured to transfer the emergency solution to the secondary storage system.

6. A mobile plant for treating medium and low level solid radioactive waste as claimed in claim 1, wherein the pumping system comprises a paste pump, an inlet of the paste pump communicates with a discharge port of a superior system, an outlet of the paste pump communicates with a discharge line, a flow limiting valve is disposed on the discharge line, and an end of the discharge line communicates with a hose.

7. A mobile plant for treating medium and low level solid radioactive waste according to claim 4, wherein the mixing system is a planetary or forced mixer and comprises a mixing tank, a mixing shaft and mixing blades, the emergency system being in communication with an internal space of the mixing tank by means of two spray nozzles, the two spray nozzles being located in the mixing tank, one directed towards the mixing shaft and the other directed towards an internal wall of the mixing tank.

8. The mobile plant for treating medium and low level solid radioactive waste as claimed in claim 4, wherein the cement attachment system further comprises a central control system, and the central control system determines whether the paste carried by each is viscous according to real-time power and current data from a mixing electric motor in the mixing system.

9. Mobile facility for the treatment of solid radioactive waste

The medium and low level trap according to claim 5, wherein the secondary storage system comprises a first storage bin and a second storage bin, the first storage bin being located above the second storage bin, a top of the first storage bin being provided with a liquid level controller, when the paste in the first storage bin flows up to 3/5 of its own volume or height, a discharge port at the bottom thereof is opened and the paste flows into the second storage bin.

10. A mobile plant for treating medium and low level solid radioactive waste as claimed in claim 1, wherein the cement fixing system is controlled to operate by remote control and is provided with video surveillance.