TWI810471B - Vacuum drying heat treatment stabilization method and system for waste resin with low radioactivity - Google Patents

Abstract

The present invention is a vacuum drying heat treatment stabilization method and system for waste resin with low radioactivity. It includes a stirring device, a heating device and a vacuum extraction device. The stirring device includes a stirring tank, and the stirring tank is provided with an inlet and an outlet. In addition, the heating device covers the stirring device and heats the stirring tank through the heating device. The vacuum extraction device uses a vacuum extraction pipeline to connect to one side of the stirring device. Wherein, the stirring device is heated by the heating device, and the stirring device is vacuumed through the vacuum extraction device, and a gas extracted is discharged from the external environment.

Description

Vacuum drying heat treatment stabilization method and system for low-radioactive waste resin

The present invention relates to a method and system thereof, in particular to a method and system for stabilizing low-radioactive waste resin by vacuum drying heat treatment.

The main source of domestic low-level radioactive waste mainly includes radioactively polluted waste resin, waste liquid, residue, clothing, components, etc. Among them, among the many radioactive wastes, waste ions produced in the cooling water and wastewater treatment systems of nuclear power plants Exchange resins (ion-exchange resins, IERs) occupy a considerable proportion, and these waste resins need to be stabilized before final disposal, which is also a problem encountered by nuclear power plants all over the world.

The low-level radioactive waste resin of each nuclear power plant was uniformly solidified with cement. During the previous inspections of the low-level radioactive waste (Lanyu) storage site and the routine inspection of the waste storage, it was found that the solidified body had swelling and deterioration, resulting in Additional costs are required for inspection and adjustment, which is time-consuming and laborious. At present, waste resins from nuclear power plants are dehydrated and stored in 55-gallon galvanized steel drums with HDPE plastic lining barrels, which are temporarily stored in nuclear power plant waste At the end of 2017, there were 18,779 barrels accumulated in the warehouse. In the future, nuclear power plants will be decommissioned one after another. It is necessary to develop the stabilization treatment of waste resin in a diversified way.

As far as the drying method is concerned, the traditional oven drying method must be used to dry materials in multiple trays for batch processing, and it is necessary to manually turn the materials in the trays to make the drying degree uniform. If a large amount of waste resin is to be dried, the equipment required It is huge and will consume manpower, so it is difficult to commercialize the oven drying method.

In terms of waste resin stabilization methods, the cement solidification method has the advantages of low cost and simple operation, but the solidified body of the cement solidification method has doubts about expansion and deterioration, and the volume of the final solidified waste increases a lot. Therefore, this method Will increase the cost of transportation and disposal.

In addition, there are also methods such as asphalt curing method, polymer curing method and oxidative decomposition method that can be used to treat waste resin, but the thermal stability of the cured body of the asphalt curing method is lower than that of cement cured body, which is prone to fire; polymer curing The polymerization reaction of the method may be affected by trace minerals in the waste, and the treatment cost is high; although the oxidation decomposition method has a high volume reduction ratio, the requirements for the reaction equipment are high, and the treatment process is relatively complicated.

Therefore, the present invention provides a method and system for stabilizing low-radioactive waste resin in vacuum drying and heat treatment. By reducing the moisture content of the waste resin and using a high-performance concrete disposal container to store the waste resin, the waste resin can be stabilized to provide various nuclear power plants. A novel method for stabilizing waste resins, how to effectively reduce the moisture content of the resins is a problem that those skilled in the art want to solve.

One object of the present invention is to provide a low-radioactive waste resin vacuum drying heat treatment stabilization system, which stabilizes the waste resin through heat treatment, and utilizes a stirring device, a condensation device, a vacuum extraction device, a feeding device, and a filtering device. The moisture content is reduced to less than 10%, and the high-performance concrete disposal container developed by the Nuclear Research Institute is used to store it in order to achieve volume reduction and stabilization.

For the above-mentioned purpose, the present invention provides a kind of low-radioactive waste resin vacuum drying heat treatment stabilization system, it comprises a stirring device, it is to comprise a stirring tank, the stirring tank is provided with a feed inlet and a discharge port, a heating device , which is to cover the stirring device, and a vacuum extraction device, which is connected to one side of the stirring device using a vacuum extraction pipeline, wherein the stirring device is heated by the heating device, and the vacuum extraction device is used to draw The agitator is subjected to a vacuum.

The invention provides an embodiment, which further includes a feeding device, which is arranged on one side of the feeding port.

The invention provides an embodiment, which further includes a vibrating element disposed outside the feeding device.

The present invention provides an embodiment, which further includes a condensing device, which is arranged on the vacuum extraction pipeline, and the condensing device includes a heat exchange element and a cooling element, and the heat exchange element is respectively connected to the stirring device and the vacuum An extraction device, and the refrigerating element is arranged on one side of the heat exchange element, and the refrigerating element is used to condense a gas extracted by the vacuum extraction device.

The present invention provides an embodiment, which further includes a filtering device, which is arranged on one side of the vacuum extraction device, and is used for filtering a gas extracted by the vacuum extraction device.

The invention provides an embodiment, wherein the filter device includes a high-efficiency filter cotton.

The present invention provides an embodiment, wherein the heating device is a heating electric blanket, a heating coil or an electric heater.

For the above-mentioned purpose, the present invention provides a method for stabilizing low-level radioactive waste resin by vacuum drying and heat treatment. The steps include using an electronic device to control a heating device to heat up a stirring device to a first temperature. When the stirring device is heated to At the first temperature, a waste resin is transported to a stirring tank of the stirring device through a feed port of a feeding device, and the rotation speed and heating device of the stirring device are controlled by the electronic device to make the waste resin The resin is heated to a second temperature, when the waste resin When the temperature is raised to the second temperature, a vacuum drying heat treatment procedure is carried out through a vacuum extraction device, so that the stirring tank connected to one end of a heat exchange element is evacuated, and when the vacuum drying heat treatment procedure is completed, the waste resin It is transported to a high-performance concrete disposal container through a discharge port of the stirring device for sealing.

The present invention provides an embodiment, wherein before the step of using the electronic device to control a heating device to raise the temperature of the stirring device to a first temperature, the step includes: controlling a condensing device through the electronic device to lower the temperature of the condensing device to - a third temperature.

The present invention provides an embodiment, wherein after the step of transporting the waste resin to a high-performance concrete disposal container for storage through a discharge port of the stirring device, the step includes: performing an inspection procedure of the high-performance concrete disposal container.

10: Stirring device

12: Stirring tank

122: feed port

124: Outlet

14: Heat insulation element

20: Heating device

30: Vacuum extraction device

32: Vacuum extraction pipeline

40: Condenser

42: heat exchange element

44: Condensing element

50: high efficiency filter element

60: filter element

62: hole

64: board

70: Condensed water recovery tank

80: High Performance Concrete Disposal Containers

90: Feeding device

92:Oscillating element

S5, S10, S20, S30, S40, S50, S52: steps

Figure 1: It is a schematic diagram of the device of an embodiment of the present invention; and Figure 2: It is a schematic flow chart of an embodiment of the present invention.

In order to enable your review committee members to have a further understanding and understanding of the characteristics of the present invention and the achieved effects, I would like to provide a better embodiment and a detailed description, as follows:

The traditional method of removing the moisture content of the material is usually a method of drying at a high temperature through an oven. However, because this method is placed in the oven, there is no way to heat the material evenly to achieve the effect of evaporating moisture. Therefore, the heating method through the oven Reducing the moisture content of waste resin is ineffective.

The present invention is to provide a method and system for stabilizing low-radioactive waste resin in vacuum drying and heat treatment. The present invention can reduce the moisture content of waste resin from about 50% to 60% to less than 10%, so as to achieve waste volume reduction and stabilization. The purpose of this method is to provide methods for the stabilization and final disposal of waste resins in various nuclear power plants.

Hereinafter, the present invention will be described in detail by illustrating various embodiments of the present invention by means of the accompanying drawings. Inventive concepts may, however, be embodied in many different forms and should not be construed as limited to the illustrative embodiments set forth herein.

First of all, please refer to Fig. 1, which is a device diagram of an embodiment of the present invention. As shown in the figure, the device structure includes a stirring device 10, a heating device 20, a vacuum extraction device 30, a condensing device 40, A high efficiency filter element 50 and a filter element 60 .

Wherein, the stirring device 10 comprises a stirring tank 12, and the stirring tank 12 is provided with a material inlet 122 and a material outlet 124. In addition, the heating device 20 covers the stirring device 10, and through the heating device 20, the The stirring tank 12 is heated, and the vacuum extraction device 30 is connected to one side of the stirring device 10 using a vacuum extraction pipeline 32. Further, the stirring device 10 is heated by the heating device 20 and passed through the The vacuum extraction device 30 extracts a vacuum from the stirring device 10, and discharges the extracted gas to the external environment.

The heating device 20 of the present invention is a heating electric blanket, electric heating sheet or coil, etc., and the heating device 20 is wrapped to the outside of the stirring tank 12 of the stirring device 10 through a coating method, and through a heat insulation The element 14 insulates the heat from dissipating to achieve the maximum heating effect, so that the waste resin (not shown) in the stirring tank 12 of the stirring device 10 can achieve uniform temperature through stirring.

In addition, one side of the stirring device 10 is connected with a feeding device 90, which is arranged on one side of the feeding port 122, and one side of the feeding device 90 is provided with an oscillating element 92, and the oscillating element 92 is used for To drive the feeding device 90, the feeding device 90 is vibrated through the oscillating element 92, because the vibration will vibrate the waste resin of the feeding device 90, so that the waste resin can be evenly transported to the stirring device The waste resin is stirred in the middle, wherein, the feeding device 90 can convey the waste resin to the stirring device 10 by means of a conveyor belt, or convey it by means of a screw conveying device or a horizontal conveying method, but it is not limited thereto.

Next, a condensing device 40 is provided on the vacuum extraction pipeline 32, and the condensing device 40 includes a heat exchange element 42 and a cooling element 44, and the heat exchange element 42 is connected to the stirring device 10 and the vacuum extraction device 30 respectively. , and the refrigeration element 44 is arranged on one side of the heat exchange element 42, the refrigeration element 44 is used to condense a gas (not shown) extracted by the vacuum extraction device 30, after the gas is condensed , the heat exchange element 42 will discharge the condensed water condensed after condensation, and discharge the condensed water to a condensed water recovery tank, and then transport the condensed water to a waste water treatment plant through a conveying device (not shown) for further treatment use.

In addition, since the gas extracted by the vacuum extraction pipeline 32 from the stirring device 10 may contain dust or other fine particles, a Filter element 60, the filter element 60 is used to filter the particles and dust contained in the gas, wherein the filter element 60 is a commercially available stainless steel filter tank, the tank body has a plurality of holes 62 and the bottom is a plate 64 The above-mentioned particles and dust in the gas can be retained in the filter element 60 through the plate 64, so that when the gas enters the vacuum extraction device 30 through the filter element 60, the particle or dust will not make the gas The vacuum extraction device 30 is thus clogged leading to failure.

On the other side of the vacuum extraction device 30, a high-efficiency filter element 50 is further included. The high-efficiency filter element 50 is used to filter the gas extracted by the vacuum extraction device 30, and further filters through the high-efficiency filter element 50. The gas, so that the gas can be directly discharged to the external environment without external Pollution of the external environment, wherein the high-efficiency filter element 54 uses HEPA or high-efficiency filter cotton, but is not limited to the above.

Next, please refer to FIG. 2, which is a schematic flow chart of an embodiment of the present invention. As shown in the figure, the steps include: Step S10: use an electronic device to control the heating device, so that the stirring device is heated to the first temperature; Step S20 : When the stirring device is heated up to the first temperature, the waste resin is transported to the stirring tank of the stirring device through the feeding port of the feeding device; Step S30: the electronic device controls the rotation speed of the stirring device and the heating device to make the waste resin Raise the temperature to the second temperature; step S40: when the waste resin is heated to the second temperature, carry out a vacuum drying heat treatment process through a vacuum extraction device, so that the stirring tank connected to one end of the heat exchange element is vacuumized; and step S50: vacuum drying After the heat treatment process is completed, the waste resin is transported to the high-performance concrete disposal container through the outlet of the mixing device for storage.

In step S10, the method of the present invention controls a heating device to heat up by using an electronic device, and at the same time raises the temperature of a stirring device covered by the heating device to a first temperature, wherein the first temperature is between 60° C. and 150° C. between ℃.

Furthermore, before the step S10 , a step is further included: step S5 : controlling the condensing device through an electronic device, so as to lower the temperature of the condensing device to a third temperature.

As described in the above steps, before step S10, the method of the present invention will use an electronic device (not shown, it is a conventional computer, personal computer, tablet or mobile phone) to adjust a condensing device A third temperature of 40, adjusting the temperature of the condensing device 40 is to condense a gas (not shown) extracted by a vacuum extraction device 30, so that its temperature is lowered, wherein the above-mentioned third temperature is between 5°C to -20°C.

Then, as shown in step S20 to step S30, when the stirring device 10 is heated up to the first temperature, a waste resin (not shown) is transported through a feeding device 90 from a feed port 122 of the stirring device 10 In the stirring tank 12 of the stirring device 10, the rotating speed of the stirring device 10 is controlled through the electronic device, and a heating device 20 is controlled by the electronic device, so that the waste resin is stirred by the stirring device 10 while While heating up to a second temperature, wherein the rotational speed is between 10 rpm and 30 rpm, and the second temperature is between 20° C. and 100° C.

Next, as shown in step S40 to step S50, when the temperature of the waste resin is raised to the second temperature, the method of the present invention performs a vacuum drying heat treatment process on the stirring device 10 through a vacuum extraction device 30, so that a heat exchange element The stirring tank 12 connected to one end of 42 is vacuumized, and after the vacuum drying heat treatment procedure is completed, the waste resin is transported to a high performance concrete disposal container 80 (High Performance Concrete) through a discharge port 124 of the stirring device 10. Concrete Container, HPCC) is sealed up, and includes steps in step S50: Step S52: Carry out the inspection procedure of the high-performance concrete disposal container.

As shown in step S52, after the waste resin obtained by the method of the present invention is put into the high-performance concrete disposal container 80, a test procedure is used to check whether the high-performance concrete disposal container 80 has good airtightness and whether it will If there is doubt about the leakage of waste resin, after confirming that there is no problem, the sealed high-performance concrete disposal container 80 is transported to a storage place for storage.

In order to clearly illustrate the implementation of the present invention, an example is used for illustration. The present invention controls an electronic device (not shown, which is a conventional computer, personal computer, tablet or mobile phone) to control When the heating device is used to raise the temperature of the stirring device 10 to 90°C (the first temperature), the electronic device controls the rotating speed of the stirring device 10 to be 30rpm, and the waste resin is fed from the feeding device 90 Port 122 is sent to the stirring tank 12 of the stirring device 10, the heating device is controlled to raise the temperature of the waste resin in the stirring device 10 to 60°C (the second temperature), and at the same time, the electronic device controls the While the heating device 20 is heating up, the electronic device will also control the condensing element 44 in the condensing device 40 to cool down to -20° C. (the third temperature).

When the waste resin was warmed up to 60°C, the vacuum extraction device 30 started to vacuumize the stirring tank 12, and the heating device 20 could keep the waste resin temperature of the stirring device 10 at 60°C (the second temperature), and because the temperature of the gas extracted by vacuuming is relatively high, the temperature of the gas is lowered through the heat exchange element 42 and the condensing element 44, and condensed water will be generated after the gas is condensed through the condensing element 44. After the condensed water is collected into the condensed water recovery tank 70, subsequent treatment is performed.

In addition, after the vacuum heat treatment of the waste resin is completed, it is taken out from the discharge port 124 and put into the high-performance concrete disposal container 80 and transported to the storage area for storage. It is traditionally known to dry the waste resin in an oven. For example, after the present invention treats 60 liters (about 45 kg, the treatment temperature is 20-80°C) of the resin, the moisture content drops below 10% within 6 hours, and the volume decreases. Compared with the result after drying in a traditional oven at 100 ℃, the moisture content difference is more than 30% of the waste resin.

According to the above-mentioned embodiment, the present invention is to make a method and system for stabilizing low-radioactive waste resin in vacuum drying and heat treatment. It uses a heating device to heat the waste resin, and then uses a vacuum device to pump out the moisture of the waste resin in the heating device. To reduce the moisture content of the waste resin after vacuum extraction, to stabilize and reduce the volume of the waste resin.

Therefore, the present invention is novel, progressive and can be used in the industry. It should meet the patent application requirements of my country's patent law. I file an invention patent application in accordance with the law. I pray that the bureau will grant the patent as soon as possible. I am sincerely praying.

However, the above-mentioned ones are only preferred embodiments of the present invention, and are not used to limit the scope of the present invention. For example, all equal changes and modifications are made according to the shape, structure, characteristics and spirit described in the scope of the patent application of the present invention. , should be included in the patent application scope of the present invention.

10: Stirring device

12: Stirring tank

122: feed port

124: Outlet

14: Heat insulation element

20: Heating device

30: Vacuum extraction device

32: Vacuum extraction pipeline

40: Condenser

42: heat exchange element

44: Condensing element

50: high efficiency filter element

60: filter element

62: hole

64: board

70: Condensed water recovery tank

80: High Performance Concrete Disposal Containers

90: Feeding device

92:Oscillating element

Claims (9)

A vacuum drying heat treatment stabilization system for low-radioactive waste resin, which includes: a stirring device, which includes a stirring tank, and the stirring tank is provided with a material inlet and a material outlet; a heating device, which covers the stirring tank device, wherein, the heating device is a heating electric blanket, a heating coil or an electric heater; a vacuum extraction device, which uses a vacuum extraction pipeline to connect to one side of the stirring device; a condensing device, which is arranged on On the vacuum extraction pipeline, the condensing device includes a heat exchange element and a cooling element, the heat exchange element is respectively connected to the stirring device and the vacuum extraction device; and a filter element is arranged on the stirring device and the Between the heat exchange elements, the filter element has a plurality of holes, and the bottom of the filter element is a plate; wherein, an electronic device is used to control the heating device, so that the stirring device is heated to a first temperature, when the stirring When the device is heated up to the first temperature, a waste resin is transported into the stirring tank through a feed port of a feeding device, and the rotation speed of the stirring device and the heating device are controlled by the electronic device to make the waste resin Raise the temperature to a second temperature. When the waste resin is heated to the second temperature, a vacuum drying heat treatment process is carried out through the vacuum extraction device, so that the gas in the stirring tank connected to one end of the heat exchange element passes through the The filter element enters the vacuum extraction device to be evacuated, and further, the filter element is used to filter For the particles and dust contained in the gas, the stirring device is heated by the heating device, and the stirring device is vacuumed by the vacuum extraction device. The vacuum drying heat treatment stabilization system for low-level radioactive waste resin as described in Claim 1 further includes a feeding device, which is arranged on one side of the feeding port. The vacuum drying heat treatment stabilization system for low-level radioactive waste resin as described in Claim 2, wherein the feeding device includes an oscillating element, which is arranged outside a feeding device. The vacuum drying heat treatment stabilization system for low-level radioactive waste resin as described in claim 1, wherein the refrigeration element is arranged on one side of the heat exchange element, and the refrigeration element is used to condense one of the extracted by the vacuum extraction device gas. The vacuum drying heat treatment stabilization system for low-radioactive waste resin as described in claim 1 further includes a high-efficiency filter element, which is arranged on one side of the vacuum extraction device, and is used to filter the extracted by the vacuum extraction device a gas. The low-radioactive waste resin vacuum drying heat treatment stabilization system as described in Claim 5, wherein the high-efficiency filter element is HEPA or high-efficiency filter cotton. A method for stabilizing low-radioactive waste resin by vacuum drying and heat treatment, the steps include: using an electronic device to control a heating device to raise the temperature of a stirring device to a first temperature; when the stirring device is heated to the first temperature, through A feeding port of a feeding device, transporting a waste resin to a stirring tank of the stirring device; The electronic device raises the temperature of the waste resin to a second temperature by controlling the rotation speed of the stirring device and the heating device; when the temperature of the waste resin rises to the second temperature, a vacuum drying heat treatment process is performed through a vacuum extraction device , the gas in the stirring tank connected to one end of a heat exchange element enters the vacuum extraction device through the filter element to be evacuated; and when the vacuum drying heat treatment process is completed, the waste resin passes through one of the stirring devices The discharge port is transported to a high-performance concrete disposal container for sealing. The method for stabilizing low-level radioactive waste resin by vacuum drying heat treatment as described in Claim 7, wherein before the step of using the electronic device to control a heating device to raise the temperature of the stirring device to a first temperature, it includes the step of: through the electronic device The device controls a condensing device to lower the temperature of the condensing device to a third temperature. The method for stabilizing low-level radioactive waste resin by vacuum drying and heat treatment as described in Claim 7, wherein after the step of transporting the waste resin to a high-performance concrete disposal container for sealing through the discharge port of the stirring device, it includes the steps of: carrying out One of the inspection procedures for the high performance concrete disposal container.

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