Calcining furnace and radioactive waste liquid treatment system
By setting up a design to reduce dust adhesion in the exhaust pipe of the calciner, the problem of exhaust pipe blockage is solved and efficient exhaust gas discharge is achieved.
Patent Information
- Application Number
- CN202411960595.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-03-11
AI Technical Summary
During the process of calcining radioactive waste liquid, the exhaust pipe is easily blocked due to dust adhesion, resulting in a decrease in the exhaust gas discharge rate.
A calciner is designed with the exhaust pipe arranged to reduce dust adhesion, prevent dust deposition by providing pipe fittings and insulation layers, and a dredging portion is provided in the exhaust pipe to remove adhered dust.
It effectively avoids the exhaust pipe blockage, ensures efficient exhaust gas discharge rate, and ensures the normal operation of the calcinerator.
Smart Images
Figure CN119594412A_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present application relate to the field of calciners specially suitable for incinerating special wastes, and in particular to a calciner and a radioactive waste liquid treatment system. Background Art
[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.
[0003] The two-step vitrification process has become a widely used process for treating radioactive liquid waste due to its advantages such as high treatment temperature, wide range of waste types that can be treated, long service life and high safety.
[0004] When using the two-step vitrification process to treat radioactive liquid waste, the radioactive liquid waste needs to be calcined in a calcining furnace to generate solid calcined products. During the calcination of radioactive liquid waste, the radioactive liquid waste enters the furnace tube through the furnace head, and continuously evaporates, concentrates and calcines in the furnace tube to form solid calcined products and generate tail gas; at the same time, the generated tail gas flows out of the furnace tube through the tail gas pipe and flows to the tail gas treatment system. However, in the process of the tail gas in the furnace tube flowing to the tail gas treatment system through the tail gas pipe, there is a problem of tail gas pipe blockage. Summary of the invention
[0005] A brief overview of the present application is provided below in order to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.
[0006] In view of the above problems, embodiments of the present application provide a calcining furnace and a radioactive waste liquid treatment system.
[0007] In the first aspect, the embodiment of the present application provides a calcining furnace suitable for calcining radioactive waste liquid, which includes a furnace tube, a feed part and a tail gas pipe. The furnace tube is configured to accommodate radioactive waste liquid, and the radioactive waste liquid is calcined in the furnace tube to form a calcination product and generate calcination tail gas; the feed part is fluidly connected to the furnace tube, and the radioactive waste liquid can enter the furnace tube through the feed part; the tail gas pipe is fluidly connected to the feed part, and is used to discharge the calcination tail gas generated by the radioactive waste liquid during the calcination process, and the calcination tail gas can flow from the furnace tube to the feed part, and then flow to the tail gas pipe; wherein the tail gas pipe is configured to reduce dust adhesion thereon.
[0008] The calcining furnace provided in the embodiment of the present application can avoid blockage by configuring the tail gas pipe to reduce dust adhesion thereon, thereby facilitating ensuring a higher tail gas discharge rate.
[0009] In a second aspect, an embodiment of the present application further provides a radioactive waste liquid treatment system, which includes a calcining furnace and a cold crucible provided in an embodiment of the first aspect of the present application. The radioactive waste liquid is calcined in the calcining furnace to form a calcined product, and the cold crucible is configured to solidify the calcined product. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Other objects and advantages of the present application will become apparent from the following description of the embodiments of the present application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the present application.
[0011] Figure 1 It is a schematic diagram of the structure of the calcining furnace provided in the embodiment of the present application.
[0012] Description of reference numerals:
[0013] 100. Calcination furnace;
[0014] 10. furnace tube; 20. feed part; 201. feed port; 202. guide plate; 30. tail gas pipe; 31. pipe fitting; 32. dredging part; 40. liquid inlet pipe; 50. dust removal part;
[0015] 200. Calcination product.
[0016] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding. DETAILED DESCRIPTION
[0017] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.
[0018] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.
[0019] In the related art, the direction of the tail gas will change when it flows out of the furnace pipe through the tail gas pipe and flows to the tail gas treatment system. Since the tail gas contains dust, when the direction of the tail gas changes, the dust in the tail gas will hit the inner wall of the furnace head and solidify and agglomerate, thereby blocking the tail gas pipe.
[0020] In view of the above problems, embodiments of the present application provide a calcining furnace and a radioactive waste liquid treatment system.
[0021] See also Figure 1 , Figure 1 is a schematic diagram of the structure of a calcining furnace provided in an embodiment of the present application, Figure 1 The arrow in the figure indicates the flow direction of the tail gas. The embodiment of the present application provides a calcining furnace 100, which is suitable for calcining radioactive waste liquid, and includes a furnace tube 10, a feed part 20, and a tail gas pipe 30. The furnace tube 10 is configured to accommodate radioactive waste liquid, and the radioactive waste liquid is calcined in the furnace tube 10 to form a calcination product and generate calcination tail gas; the feed part 20 is in fluid communication with the furnace tube 10, and the radioactive waste liquid can enter the furnace tube 10 through the feed part 20; the tail gas pipe 30 is in fluid communication with the feed part 20, and is used to discharge the calcination tail gas generated by the radioactive waste liquid during the calcination process, and the calcination tail gas can flow from the furnace tube 10 to the feed part 20, and then flow to the tail gas pipe 30; wherein the tail gas pipe 30 is configured to reduce dust adhesion thereon.
[0022] The calcining furnace 100 provided in the embodiment of the present application can avoid blockage by configuring the tail gas pipe 30 to reduce dust adhesion thereon, thereby facilitating ensuring a higher tail gas discharge rate.
[0023] In some embodiments, the axis of the tail gas pipe 30 and the axis of the furnace tube 10 are arranged to form an angle of 0° to 30° to reduce dust adhesion on the tail gas pipe 30. In such an embodiment, the above arrangement ensures that the flow direction of the tail gas will not change during the discharge process, which can prevent dust from adhering to the tail gas pipe 30, thereby preventing the tail gas pipe 30 from being blocked.
[0024] See also Figure 1In some embodiments, the tail gas pipe 30 may include a pipe 31 and a thermal insulation layer. The pipe 31 is in fluid communication with the feed part 20, and the calcined tail gas can be discharged through the pipe 31. The axis of the pipe 31 and the axis of the furnace tube 10 are arranged to form an angle of 0 to 30°; the thermal insulation layer is arranged on the radial outer side of the pipe 31, and is used to insulate the calcined tail gas in the pipe 31. Since the tail gas contains dust and water vapor, when the temperature of the tail gas drops, the water vapor in the tail gas condenses to form small droplets, resulting in an increase in volume, which in turn causes the condensed small droplets to collide with the dust to form larger dust, so that the dust is easily settled and accumulated on the inner wall of the pipe 31. In the embodiment of the present application, by providing a thermal insulation layer to insulate the calcined tail gas, it is possible to prevent the water vapor in the tail gas from cooling and condensing during the flow process, which is conducive to reducing the settlement and accumulation of dust on the inner wall of the pipe 31.
[0025] In some embodiments, the insulation layer may be made of insulation wool.
[0026] See also Figure 1 In some embodiments, the tail gas pipe 30 may further include a dredging portion 32, which is disposed on the pipe 31 and is used to remove dust adhering to the inner wall of the pipe 31. In such an embodiment, the dredging portion 32 removes dust adhering to the inner wall of the pipe 31, thereby preventing the pipe 31 from being blocked due to a large amount of dust adhering to the inner wall of the pipe 31.
[0027] join Figure 1 In some embodiments, the dredging portion 32 is arranged obliquely relative to the tailpipe 30. In such an embodiment, the above arrangement is conducive to improving the effect of the dredging portion 32 in removing dust adhering to the inner wall of the pipe 31.
[0028] In some embodiments, the dredging portion 32 can move relative to the inner wall of the tail pipe 30 to remove dust adhered to the inner wall of the tail pipe 30, or the dredging portion 32 can spray liquid to remove dust adhered to the inner wall of the tail pipe 30. In such an embodiment, a suitable method for removing dust adhered to the inner wall of the tail pipe 30 can be selected according to the actual dust adhesion situation.
[0029] In some embodiments, when the clearing part 32 removes dust adhering to the inner wall of the exhaust pipe 30 by relative movement with the inner wall of the exhaust pipe 30, the clearing part 32 may be a circular wire brush; when the clearing part 32 removes dust adhering to the inner wall of the exhaust pipe 30 by spraying liquid, the clearing part 32 may be a flushing nozzle.
[0030] See also Figure 1In some embodiments, the calcining furnace 100 may further include a liquid inlet pipe 40, which is disposed at the feed port 201 of the feed part 20 and extends from the outside of the feed part 20 into the feed part 20 through the feed port 201, and is used to transport the radioactive waste liquid to the feed part 20, and then to the furnace tube 10; wherein the liquid inlet pipe 40 is disposed at the feed port 201 at an angle downward relative to the axis of the furnace tube 10. In such an embodiment, the amount of tail gas entering the feed pipe can be reduced, and the feed pipe can be prevented from being blocked by the tail gas entering the feed pipe.
[0031] See also Figure 1 In some embodiments, the calcining furnace 100 may further include a dust removal member 50, which is connected to the tail gas pipe 30, and the calcined tail gas can be discharged to the dust removal member 50 via the tail gas pipe 30, and the dust removal member 50 can remove dust in the calcined tail gas; wherein the tail gas pipe 30 is arranged between the dust removal member 50 and the feed part 20, and the axis of the tail gas pipe 30 is a straight line. In the related art, the tail gas pipe 30 arranged between the dust removal member 50 and the feed part 20 has a bend, and the axis of the tail gas pipe 30 is not a straight line, which causes the dust in the tail gas to remain in the bend of the tail gas pipe 30, and the residual dust may cause the tail gas pipe 30 to be blocked. In the embodiment of the present application, by setting the axis of the tail gas pipe 30 arranged between the dust removal member 50 and the feed part 20 to a straight line, the bend of the tail gas pipe 30 can be avoided, and then the dust in the tail gas can be avoided from remaining in the bend of the tail gas pipe 30.
[0032] See also Figure 1 In some embodiments, the feed section 20 may include a guide plate 202 for guiding the calcined tail gas in the furnace tube 10 to flow to the tail gas pipe 30; the guide plate 202 is disposed below the liquid inlet pipe 40 and is disposed in parallel with the liquid inlet pipe 40, and the length of the guide plate 202 is greater than the length of the liquid inlet pipe 40 located in the feed section 20. In such an embodiment, the tail gas can be guided into the tail gas pipe 30 by the guide plate 202, and the amount of tail gas entering the feed pipe can be reduced; at the same time, the guide plate 202 is disposed below the feed pipe and is parallel to the feed pipe, and the length of the guide plate 202 is greater than the length of the liquid inlet pipe 40 located in the feed section 20, which is conducive to preventing the tail gas from entering the feed pipe as much as possible.
[0033] The embodiment of the present application also provides a radioactive waste liquid treatment system, which includes the calcining furnace 100 and the cold crucible provided in the embodiment of the first aspect of the present application. The radioactive waste liquid is calcined in the calcining furnace 100 to form a calcined product 200, and the cold crucible is configured to solidify the calcined product 200.
[0034] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.
[0035] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.
Claims
1. A calcining furnace, suitable for calcining radioactive waste liquid, characterized in that: include: A furnace tube, wherein the furnace tube is configured to contain the radioactive waste liquid, wherein the radioactive waste liquid is calcined in the furnace tube to form a calcined product and generate a calcined tail gas; A feed part, which is in fluid communication with the furnace tube, and the radioactive waste liquid can enter the furnace tube through the feed part; A tail gas pipe is in fluid communication with the feed part and is used to discharge the calcination tail gas generated during the calcination of the radioactive waste liquid, wherein the calcination tail gas can flow from the furnace pipe to the feed part and then flow to the tail gas pipe; Wherein, the tail gas pipe is configured to reduce dust adhesion thereon.
2. The calcining furnace according to claim 1, characterized in that: The axis of the tail gas pipe and the axis of the furnace pipe are arranged to form an angle of 0° to 30°, so as to reduce dust adhesion on the tail gas pipe.
3. The calcining furnace according to claim 1 or 2, characterized in that: The tailpipe comprises: A pipe, which is in fluid communication with the feed part, through which the calcined tail gas can be discharged, and the axis of the pipe and the axis of the furnace tube are arranged to form an angle of 0 to 45°; The heat-insulating layer is arranged on the radially outer side of the pipe and is used for heat-insulating the calcination tail gas in the pipe.
4. The calcining furnace according to claim 3, characterized in that: The tailpipe also includes: The dredging part is arranged on the pipe and is used to remove dust adhering to the inner wall of the pipe.
5. The calcining furnace according to claim 4, characterized in that: The dredging portion is arranged obliquely relative to the tail gas pipe.
6. The calcining furnace according to claim 4, characterized in that: The dredging part can move relative to the inner wall of the tail pipe to perform friction cutting to remove dust adhering to the inner wall of the tail pipe, or the dredging part can spray liquid to remove dust adhering to the inner wall of the tail pipe.
7. The calcining furnace according to any one of claims 1 to 6, characterized in that: Also includes: A liquid inlet pipe, which is arranged at a feed port of the feed section and extends from the outside of the feed section into the feed section through the feed port, and is used to transport the radioactive waste liquid to the feed section and then to the furnace tube; Wherein, the liquid inlet pipe is arranged at the feed port in a downwardly inclined manner relative to the axis of the furnace tube.
8. The calcining furnace according to any one of claims 1 to 7, characterized in that: Also includes: A dust removal component is connected to the tail gas pipe, the calcination tail gas can be discharged to the dust removal component through the tail gas pipe, and the dust removal component can remove dust in the calcination tail gas; Wherein, the tail gas pipe is arranged between the dust removal component and the feeding part, and the axis of the tail gas pipe is a straight line.
9. The calcining furnace according to claim 7, characterized in that: The feed section includes a guide plate for guiding the calcination tail gas in the furnace tube to flow to the tail gas pipe; the guide plate is arranged below the liquid inlet pipe and parallel to the liquid inlet pipe, and the length of the guide plate is greater than the length of the liquid inlet pipe located in the feed section.
10. A radioactive waste liquid treatment system, characterized in that: It includes: The calcining furnace according to any one of claims 1 to 9, wherein the radioactive waste liquid is calcined in the calcining furnace to form a calcined product. A cold crucible is provided to solidify the calcined product.