A supply device for supplying liquid waste to a low-temperature melting furnace and a supply method using the same.

Abstract

The present invention relates to a supply device for supplying liquid waste to a low-temperature melting furnace, the supply device including: a storage unit in which the liquid waste and a solvent are stored; a supply pipe for supplying the liquid waste and the solvent from the storage unit to a melting space of the low-temperature melting furnace; and a transmission unit, at least a portion of which is located within the supply pipe, forcibly injecting the liquid waste and the solvent into the melting space through a spiral supply channel.

Description

Technical Field

[0001] The present invention relates to a supply device for supplying liquid waste to a low-temperature melting furnace and a supply method using the same.

Background Art

[0002] It is necessary to more stably process, store, and manage radioactive waste generated by nuclear power generation or the like. Among the methods for treating and storing hazardous waste, the low-temperature melting furnace vitrification technology has been developed.

[0003] The low-temperature melting furnace vitrification technology is to use an induction heating type low-temperature melting furnace to burn hazardous waste, melt heavy metals, vitrify and solidify them into glass, and confine them in the glass structure so as not to leach into the surrounding environment and isolate them.

[0004] During the operation of the vitrification equipment for vitrification, waste (combustible miscellaneous solids, slurries, etc.) is introduced into the upper part of the melt through a waste supply pipe installed at the upper part of the low-temperature melting furnace, and pyrolysis treatment is performed.

[0005] When liquid waste is introduced into the vitrification equipment (low-temperature melting furnace), conventionally, a simple pipe-shaped introduction pipe has been applied, so it has been difficult to measure the amount of waste, and there have been problems such as pollution diffusion and backflow.

Summary of the Invention

Problems to be Solved by the Invention

[0006] An object of the present invention is to provide a supply device for supplying liquid waste to a low-temperature melting furnace and a supply method using the same.

Means for Solving the Problems

[0007] The present invention relates to a supply device for supplying liquid waste to a cryogenic melting furnace, comprising: a storage unit in which the liquid waste and solvent are stored; a supply pipe for supplying the liquid waste and solvent from the storage unit to the melting space of the cryogenic melting furnace; and a transmission unit, at least a portion of which is located within the supply pipe, forcibly injecting the liquid waste and solvent into the melting space via a helical supply channel.

[0008] The storage unit may include a first storage tank in which the liquid waste is stored, and a second storage tank separated from the first storage tank in which the solvent is stored.

[0009] The system may further include a regulating member for independently adjusting the amount of liquid waste and solvent flowing from the storage unit into the supply piping.

[0010] The transmission unit includes a rotatable screw, which can prevent backflow of vaporized liquid waste in the molten space.

[0011] The transmission unit further includes a central shaft, the screw is connected to the central shaft, and the outer diameter of the screw blades may be 95% to 100% of the inner diameter of the supply pipe.

[0012] The present invention relates to a method for supplying liquid waste to a low-temperature melting furnace, The present invention relates to a method for supplying liquid waste to a low-temperature melting furnace, comprising the steps of: supplying the liquid waste to the melting space of the low-temperature melting furnace via a supply pipe using a transmission unit including a helical structure; melting the supplied liquid waste in the melting space; discharging the melted liquid waste from the melting space; and decontaminating the supply pipe and transmission unit by supplying a solvent after the discharge of the liquid waste. [Effects of the Invention]

[0013] According to the present invention, a supply device for supplying liquid waste to a low-temperature melting furnace and a supply method utilizing the same are provided. [Brief explanation of the drawing]

[0014] [Figure 1] This figure shows a supply device for supplying liquid waste to a low-temperature melting furnace according to one embodiment of the present invention. [Figure 2] This flowchart shows a method for supplying liquid waste to a low-temperature melting furnace according to one embodiment of the present invention. [Modes for carrying out the invention]

[0015] The present invention will be described in more detail below with reference to the drawings.

[0016] The attached drawings are merely examples illustrating the technical concept of the present invention in more detail, and the concept of the present invention is not limited to the attached drawings. Furthermore, the attached drawings may exaggerate sizes and spacings in order to illustrate the relationships between the various components.

[0017] Figure 1 shows a supply device (hereinafter referred to as "supply device") for supplying liquid waste to a low-temperature melting furnace according to one embodiment of the present invention.

[0018] In this invention, the term "low-temperature melting furnace" refers to, but is not limited to, a low-temperature melting furnace in a vitrification facility for processing radioactive waste (liquid or solid waste) within a nuclear power plant.

[0019] The supply device 1 includes a storage unit 100, a regulating member 200, a supply pipe 300, and a transmission unit 400.

[0020] The storage unit 100 stores liquid waste and solvents and includes a first storage tank 110 and a second storage tank 120.

[0021] Liquid waste is stored in the first storage tank 110. The first storage tank 110 is filled with liquid waste up to a set capacity, but is not limited thereto. In other embodiments, the first storage tank 110 may be filled with melt target substances such as radioactive waste, general industrial waste, ceramic materials, and metal materials.

[0022] Referring to FIG. 1, the first storage tank 110 is shown in a tank shape, but is not limited thereto. In other embodiments, it may be provided with a normal structure.

[0023] Although not shown, a separate device such as a pump may be further installed to allow the liquid waste in the first storage tank 110 to flow smoothly into the supply pipe 300.

[0024] The second storage tank 120 is separated from the first storage tank 110 and stores a solvent. The second storage tank 120 may be filled with the solvent up to a set capacity, and the second storage tank 120 may be provided with a normal structure.

[0025] In this embodiment, the solvent stored in the second storage tank 120 may be a normal general-purpose solvent for decontaminating the liquid waste adhering to the supply pipe and the transfer unit.

[0026] Although not shown, a separate device such as a pump may be further installed to allow the solvent in the second storage tank 120 to flow smoothly into the supply pipe 300.

[0027] Referring to FIG. 1, the adjustment member 200 independently adjusts the inflow amounts of the liquid waste and the solvent flowing from the storage unit 100 into the supply pipe 300. In particular, since the mixing ratio of the liquid waste and the solvent can be adjusted by the adjustment member 200, the liquid waste and the solvent supplied to the melting space K via the supply pipe 300 can be supplied more efficiently.

[0028] Referring to Figure 1, the adjustment member 200 is located in a separate pipe connected between the storage unit 100 and the supply pipe 300, but is not limited thereto. In other embodiments, the adjustment member 200 may also be installed in such a way that at least a portion of it is coupled to the storage unit 100.

[0029] The adjustment member 200 includes a first adjustment member 210, a second adjustment member 220, and a third adjustment member 230.

[0030] The first adjustment member 210 adjusts the amount of liquid waste flowing in from the first storage tank 110.

[0031] Referring to Figure 1, the first adjustment member 210 may be installed in the form of a valve, but is not limited to this. Here, the flow rate of liquid waste supplied from the first storage tank 110 to the supply pipe 300 can be adjusted by opening and closing the valve.

[0032] The second adjustment member 220 adjusts the amount of solvent flowing in from the second storage tank 120.

[0033] Referring to Figure 1, the second adjustment member 220 may be installed in the form of a valve, but is not limited to this. Here, the amount of solvent supplied from the second storage tank 120 to the supply pipe 300 can be adjusted by opening and closing the valve.

[0034] The third adjustment member 230 adjusts the amount of liquid waste and solvent mixture flowing into the supply pipe 300.

[0035] Referring to Figure 1, the third adjustment member 230 may, but is not limited to, be installed in the form of a valve. Here, by opening and closing the valve, it is possible to adjust the inflow rate of the mixture of liquid waste and solvent supplied from the first storage tank 110 and the second storage tank 120 to the supply pipe 300.

[0036] The supply piping 300 supplies liquid waste and solvent from the storage unit 100 to the molten space K of the low-temperature melting furnace.

[0037] In this embodiment, the low-temperature melting furnace used for melting liquid waste is not limited to any particular type.

[0038] Referring to Figure 1, the supply piping 300 is shown to be formed as a straight pipe overall, but is not limited thereto. In other embodiments, the supply piping 300 may be a variety of piping configurations that facilitate the input of liquid waste and solvents, and may be made of a flexible material.

[0039] Although not shown in the diagram, the system may further include a heat source (e.g., a heater) that encloses at least a portion of the supply pipe 300 and facilitates the flow of liquid waste and solvent through the supply pipe 300.

[0040] The transmission unit 400 is located at least partially within the supply piping 300 and forces liquid waste and solvent into the molten space K via a spiral supply channel.

[0041] The transmission unit 400 includes a rotatable screw to prevent backflow of vaporized liquid waste in the molten space K.

[0042] The screw has an overall elongated hollow tube shape, and although not shown in the illustration, it may further include a screw body with screw blades formed on the outside and a screw extension portion that extends from the screw body and does not have screw blades formed thereon.

[0043] The screw blades may be provided in various forms, such as being formed continuously or intermittently.

[0044] The transmission unit 400 further includes a central axis I, and the screw is connected to the central axis I, and the outer diameter of the screw blade may be 80% to 100%, 85% to 100%, and 90% to 100% of the inner diameter of the supply pipe, and preferably 95% to 100%.

[0045] The rotation of the central axis I, which is connected to the screw, causes the entire screw to rotate, and this rotation of the screw efficiently supplies the liquid waste into the molten space K.

[0046] Referring to Figure 2, a method for supplying liquid waste to a low-temperature melting furnace using the supply device of the present invention will be described.

[0047] Figure 2 is a flowchart showing a method for supplying liquid waste to a low-temperature melting furnace according to one embodiment of the present invention.

[0048] First, liquid waste is supplied to the molten space K of the low-temperature melting furnace via the supply pipe 300 using a transmission unit 400 that includes a helical structure (S100).

[0049] When liquid waste flows from the first storage tank 110 into the supply pipe 300, it is supplied to the molten space K of the final low-temperature melting furnace via the transmission unit 400. Here, the supply of liquid waste is carried out by forced injection from the first storage tank 110 through the transmission unit 400 in the supply pipe 300.

[0050] Specifically, the liquid waste supplied to the supply pipe 300 is efficiently delivered to the molten space K by a rotating screw connected to the central axis I.

[0051] The efficient supply of liquid waste by the screw mechanism significantly mitigates various problems that occurred during the input of existing waste (such as waste clogging in piping, volatilization, and scattering), allowing for stable melting in the melting space K. Additionally, the screw mechanism has a positive impact on the efficient input of liquid waste and also helps in the decontamination of the supply piping 300 and transmission unit 400.

[0052] At this time, the inflow rate of liquid waste is regulated by the adjustment member 200. In particular, the inflow rate of liquid waste supplied from the first storage tank 110 to the supply pipe 300 is appropriately regulated by the first adjustment member 210.

[0053] Subsequently, the supplied liquid waste is melted in the melting space K (S200). At this time, if the liquid waste is vaporized by melting in the melting space K, backflow is prevented by the transmission unit 400.

[0054] Next, the molten liquid waste is discharged from the molten space K (S300).

[0055] Although not shown in the diagram, a separate device may be installed to further treat the molten liquid waste discharged from the molten space K. Such post-treatment can reduce the volatilization of harmful substances and radioactive nuclides generated during the thermal decomposition process of the waste.

[0056] Finally, after the liquid waste is discharged, a solvent is supplied to decontaminate the supply piping 300 and the transmission unit 400 (S400). Here, the solvent is supplied by forced injection from the second storage tank 120 through the transmission unit 400 in the supply piping 300.

[0057] Specifically, the solvent supplied to the supply pipe 300 and the transmission unit 400 decontaminates the liquid waste with respect to residual hazardous substances and radionuclides, thereby minimizing the amount of radioactive waste released to the outside.

[0058] In this embodiment, the solvent is supplied after the molten liquid waste has been discharged from the molten space K. However, the invention is not limited to this, and in other embodiments, the solvent can be supplied simultaneously with the liquid waste to decontaminate the supply piping 300 and the transmission unit 400.

[0059] The embodiments described above are illustrative for illustrating the present invention, and the present invention is not limited thereto. Since a person with ordinary skill in the art to which the present invention belongs can implement the present invention in various ways, the scope of technical protection of the present invention must be defined by the appended claims. [Explanation of Symbols]

[0060] 1 supply device, 100 storage unit, 110 first storage tank, 120 second storage tank, 200 adjustment member, 300 supply piping, 400 transmission unit, I central axis, K melting space

Claims

1. A supply device for supplying liquid waste to a low-temperature melting furnace, A storage unit in which the aforementioned liquid waste and solvent are stored; A supply pipe for supplying the liquid waste and the solvent from the storage unit to the melting space of the cryogenic melting furnace; and A supply device for supplying liquid waste to a low-temperature melting furnace, which includes a transmission unit that is located at least partially within the supply piping and forcibly injects the liquid waste and the solvent into the melting space via a spiral supply channel.

2. The aforementioned storage unit is A first storage tank in which the liquid waste is stored; and A supply device for supplying liquid waste to a low-temperature melting furnace according to claim 1, comprising: a second storage tank separated from the first storage tank and in which the solvent is stored;

3. A supply device for supplying liquid waste to a low-temperature melting furnace according to claim 2, further comprising a regulating member for independently regulating the amount of liquid waste and solvent flowing from the storage unit into the supply pipe.

4. The transmission unit includes a rotatable screw, The aforementioned screw is A supply device for supplying liquid waste to a low-temperature melting furnace according to claim 1, which prevents backflow of vaporized liquid waste in the melting space.

5. The transmission unit further includes a central axis, The screw is connected to the central shaft, A supply device for supplying liquid waste to a low-temperature melting furnace according to claim 4, wherein the outer diameter of the screw blades is 95% to 100% of the inner diameter of the supply pipe.

6. A method for supplying liquid waste to a low-temperature melting furnace, A step of supplying the liquid waste to the molten space of the low-temperature melting furnace via a supply pipe using a transmission unit including a helical structure; A step of melting the supplied liquid waste in the melting space; A step of discharging the molten liquid waste from the molten space; and A method for supplying liquid waste to a low-temperature melting furnace, comprising the step of supplying a solvent after the discharge of the liquid waste to decontaminate the supply piping and the transmission unit.

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