Supply device for supplying liquid waste to a low-temperature melting furnace and 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 technology]

[0002] It is necessary to more stably treat, store, and manage radioactive waste generated by nuclear power generation, etc. Low-temperature melting furnace vitrification technology has been developed as a method for treating and storing hazardous waste.

[0003] Low-temperature melting furnace vitrification technology uses an induction-heated low-temperature melting furnace to burn hazardous waste, melting and solidifying heavy metals into glass, which is then trapped in the glass structure and isolated from the surrounding environment.

[0004] When operating the vitrification facility for vitrification, waste (combustible miscellaneous solids, slurry, etc.) is fed onto the top of the melt through a waste supply pipe installed at the top of the low-temperature melting furnace, and thermal decomposition is performed.

[0005] When liquid waste was fed into a vitrification facility (low-temperature melting furnace), a simple pipe-shaped feed tube was conventionally used, which made it difficult to measure the amount of waste and led to problems such as contamination diffusion and backflow. Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE INVENTION 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 problem]

[0007] 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 transfer 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.

[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 apparatus may further include an adjusting member for independently adjusting the inflow rates of the liquid waste and the solvent flowing from the storage unit into the supply pipe.

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

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

[0012] The present invention provides a method for supplying liquid waste to a low-temperature melting furnace, comprising the steps of: The present invention relates to a method for supplying liquid waste to a low-temperature melting furnace, the method comprising: supplying the liquid waste to a melting space of the low-temperature melting furnace through a supply pipe using a transfer unit having a spiral 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 the transfer unit by supplying a solvent after discharging the liquid waste. [Effects of the Invention]

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

[0014] [Figure 1] FIG. 1 illustrates a feeding device for feeding liquid waste to a low-temperature melting furnace according to one embodiment of the present invention. [Figure 2] 1 is a flow chart illustrating a method for supplying liquid waste to a low-temperature melting furnace according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

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

[0016] The accompanying drawings are merely examples shown to more specifically explain the technical concept of the present invention, and the concept of the present invention is not limited to the accompanying drawings. Also, in the accompanying drawings, sizes and intervals may be exaggerated to explain the relationship between each component.

[0017] FIG. 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] The low-temperature melting furnace in the present invention refers to, but is not limited to, a low-temperature melting furnace in a vitrification facility for treating radioactive waste (liquid waste or solid waste) in a nuclear power plant.

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

[0020] The storage unit 100 contains a first storage tank 110 and a second storage tank 120 in which liquid waste and solvent are stored.

[0021] Liquid waste is stored in the first storage tank 110. The first storage tank 110 is filled with the liquid waste to a set volume, but is not limited to this. In other embodiments, the first storage tank 110 may be filled with a material to be melted, such as radioactive waste, general industrial waste, ceramic materials, or metal materials.

[0022] 1, the first reservoir 110 is shown in the form of a tank, but is not limited thereto, and may be provided in any conventional structure in other embodiments.

[0023] Although not shown, a separate device such as a pump may be further installed to ensure that the liquid waste in the first storage tank 110 flows 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 a set volume of solvent, and may have a conventional structure.

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

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

[0027] 1, the adjusting member 200 independently adjusts the inflow rates of the liquid waste and the solvent flowing from the storage unit 100 to the supply pipe 300. In particular, since the adjusting member 200 can adjust the mixing ratio of the liquid waste and the solvent, the liquid waste and the solvent can be supplied to the melting space K through the supply pipe 300 more efficiently.

[0028] 1, the adjusting member 200 is shown positioned in a separate pipe connected between the storage unit 100 and the supply pipe 300, but is not limited to this. In other embodiments, the adjusting member 200 may be installed such that at least a portion of the adjusting member 200 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 adjusting member 210 adjusts the inflow of the liquid waste discharged from the first storage tank 110 .

[0031] 1, the first adjusting member 210 may be installed in the form of, but is not limited to, a valve, and the inflow amount 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 adjusting member 220 adjusts the inflow of the solvent discharged from the second storage tank 120 .

[0033] 1, the second adjusting member 220 may be installed in the form of, but is not limited to, a valve, and the inflow rate of the 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 adjusting member 230 adjusts the amount of the mixture of liquid waste and solvent flowing into the supply pipe 300 .

[0035] 1, the third adjusting member 230 may be installed in the form of, but is not limited to, a valve, and opening and closing the valve allows adjustment of the inflow 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] A supply line 300 delivers liquid waste and solvent from the storage unit 100 to the melting space K of the low temperature melting furnace.

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

[0038] 1, the supply pipe 300 is shown as being generally formed as a straight pipe, but is not limited to this. In other embodiments, the supply pipe 300 may be formed as a pipe of various shapes that facilitates the introduction of liquid waste and solvent, and may be made of a flexible material.

[0039] Although not shown, a heat source device (e.g., a heater) may also be included that encases at least a portion of the supply piping 300 and facilitates the flow of liquid waste and solvent through the supply piping 300.

[0040] The transfer unit 400 is located at least partially within the supply pipe 300 and forces the liquid waste and solvent into the melt space K via the spiral supply channel.

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

[0042] The screw has an elongated hollow tubular shape overall, and although not shown, may further include a screw body having screw blades formed on the outside and a screw extension portion extending from the screw body and having no screw blades formed thereon.

[0043] The screw blades may be provided in various forms, such as continuous or discontinuous.

[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%, suitably 95% to 100% of the inner diameter of the supply pipe.

[0045] The rotation of the central shaft I connected to the screw rotates the entire screw, and the liquid waste is efficiently supplied to the melting space K by the rotation of the screw.

[0046] A method for supplying liquid waste to a low-temperature melting furnace using the supply device of the present invention will be described with reference to FIG.

[0047] FIG. 2 is a flow chart illustrating 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 melting space K of the low-temperature melting furnace through the supply pipe 300 by using the transmission unit 400 having a spiral structure (S100).

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

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

[0051] The efficient supply of liquid waste by the screw can greatly alleviate various problems that occurred when conventional waste was introduced (such as clogging of the waste in the pipes, evaporation, and scattering), and the melting process can be carried out stably in the melting space K. In addition, the screw has a positive effect on the efficient introduction of liquid waste and is also useful for decontaminating the supply pipe 300 and the transfer unit 400.

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

[0053] Thereafter, the supplied liquid waste is melted in the melting space K (S200). At this time, in the case of liquid waste vaporized by melting in the melting space K, the transfer unit 400 prevents backflow.

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

[0055] Although not shown, a separate device may be installed to post-treat the melted liquid waste discharged from the melting space K, and 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 pipe 300 and the transfer unit 400 (S400). Here, the solvent is supplied from the second storage tank 120 through the transfer unit 400 in the supply pipe 300 by forced injection.

[0057] Specifically, the solvent supplied to the supply pipe 300 and the transmission unit 400 decontaminates harmful substances and radioactive nuclides remaining in the liquid waste, thereby minimizing the amount of radioactive waste discharged to the outside.

[0058] In this embodiment, the solvent is supplied after the melted liquid waste is discharged from the melting space K, but this 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 above-described embodiments are merely examples for explaining the present invention, and the present invention is not limited thereto. A person skilled in the art to which the present invention pertains can implement the present invention by modifying it in various ways, and therefore the technical scope of protection of the present invention should 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 pipe, 400 transmission unit, I central axis, K melting space

Claims

1. A supply device for supplying liquid waste to a low-temperature melting furnace, comprising: a storage unit in which the liquid waste and solvent are stored; supply lines for supplying the liquid waste and the solvent from the storage unit to a melting space of the low-temperature melting furnace; and a supply device for supplying liquid waste to the low-temperature melting furnace, the supply device including a transfer unit at least partially located within the supply pipe for forcing the liquid waste and the solvent into the melting space via a spiral supply channel;

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

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

4. the transmission unit includes a rotatable screw; The screw 2. The 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 shaft; The screw is connected to the central shaft, 5. The supply device for supplying liquid waste to a low-temperature melting furnace according to claim 4, wherein the outer diameter of the screw blade 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, comprising: supplying the liquid waste to the melting space of the low-temperature melting furnace through a supply pipe using a transmission unit including a spiral structure; a step of melting the supplied liquid waste in the melting space; Discharging the melted liquid waste from the melting space; and a step of supplying a solvent to decontaminate the supply pipe and the transfer unit after the liquid waste is discharged.

Images