Spray drying device for volume reduction treatment of radioactive waste liquid

Abstract

The utility model discloses a spray drying device for volume reduction treatment of radioactive waste liquid. The spray drying device comprises a feeding unit, a heating unit, a drying unit, a powder filtering and recycling unit and a condensing unit, the feeding unit is connected with the feeding end of the drying unit, the heating unit is connected with the air inlet end of the drying unit, and the powder filtering and recycling unit is connected with the powder outlet end of the drying unit. The radioactive waste liquid is treated through the links of modulation, conveying, atomization, spray drying, cyclone dust removal, filtration, tail gas cooling, tail gas reheating, powder collection and the like, and the volume reduction effect is good; the spray drying tower is good in drying effect and does not need to be cleaned frequently.

Description

Technical Field

[0001] This utility model relates to the field of volume reduction treatment of radioactive wastewater, and in particular to a spray drying device for volume reduction treatment of radioactive waste liquid. Background Technology

[0002] Nuclear power plants generate radioactive waste liquid during the treatment of waste gas, wastewater, and solidified waste. Currently, the method for treating this waste liquid involves mixing inside a container and then mixing it with cement outside the container. This method significantly increases the volume of the waste liquid, making it less effective for volume reduction. Chinese patent CN117771703A discloses a mixed-flow spray drying device, a method and system for treating radioactive saline waste liquid. This patent utilizes a spray drying method to atomize low- and intermediate-level radioactive waste liquid into powder, achieving good volume reduction. The current spray drying method has the following problems:

[0003] First: After spray drying, the powder tends to stick to the inner wall of the drying tower and needs to be cleaned frequently;

[0004] Second: The drying tower is not drying effectively, and some mist-like droplets are discharged with the gas without being fully dried. Utility Model Content

[0005] The purpose of this invention is to provide a spray drying device for volume reduction treatment of radioactive waste liquid.

[0006] The innovation of this utility model lies in the following: This application treats radioactive waste liquid through a process of modulation, transportation, atomization, spray drying, cyclone dust removal, filtration, cooling, reheating, and powder collection, resulting in good volume reduction; the spray drying tower has good drying effect and does not require frequent cleaning.

[0007] To achieve the aforementioned objectives, the technical solution of this utility model is as follows:

[0008] A spray drying apparatus for volume reduction treatment of radioactive waste liquid includes a feeding unit, a heating unit, a drying unit, and a powder filtration and recovery unit. The feeding unit is connected to the feed end of the drying unit, the heating unit is connected to the air inlet end of the drying unit, and the powder filtration and recovery unit is connected to the powder outlet end of the drying unit. The feeding unit includes a metering tank and an atomizer. A metering pump is installed in the metering tank, and a pipe heater is installed at the end of the liquid inlet pipe between the metering pump and the atomizer, near the atomizer. The drying unit includes a spray drying tower, the atomizer is installed at the top of the spray drying tower, and several jet nozzles are installed on the inner wall of the spray drying tower. The jet nozzles are arranged in a spiral shape, and the jet direction of the jet nozzles is tangential to the inner wall of the spray drying tower and the jet direction is spiral upward. The heating unit includes an electric heater and a drying medium, and the drying medium is introduced into the jet nozzles through a ventilation pipe.

[0009] Furthermore, the powder filtration and recovery unit includes a cyclone separator, a bag filter, a high-efficiency filter, and a powder collection box; the cyclone separator is connected to the spray drying tower, and the powder outlet of the cyclone separator is connected to the powder collection box; the air outlet of the cyclone separator is connected to the bag filter, the powder outlet of the bag filter is connected to the powder collection box, and the air outlet of the bag filter is connected to the high-efficiency filter.

[0010] Furthermore, the spray drying device also includes a condensation unit connected to a high-efficiency filter. The condensation unit includes a condenser, a condensate recovery tank connected to the condenser outlet, and a reheater connected to the condenser outlet.

[0011] Furthermore, the spray drying apparatus also includes a circulating fan connected to a reheater, and the circulating fan is connected to a heating unit.

[0012] Furthermore, the cleaning unit includes a lifting assembly and a cleaning nozzle disposed at the lower end of the lifting assembly.

[0013] Furthermore, a gas pressure regulating valve is installed on the ventilation pipe.

[0014] The beneficial effects of this utility model are:

[0015] First: This application treats radioactive waste liquid through processes such as conditioning, transportation, atomization, spray drying, cyclone dust removal, filtration, cooling, reheating, and powder collection, achieving good volume reduction effect.

[0016] Second: This application utilizes a metering pump to precisely control the liquid inlet, a pipeline heater to preheat the waste liquid, and a spiral arrangement of jet nozzles within the spray drying tower. The combination of these three elements enhances the drying effect of the spray drying tower, ensuring that the mist droplets are fully dried and achieving a good drying effect.

[0017] Third: The jet nozzle sprays upwards in a spiral shape, forming a gas vortex inside the spray drying tower. The mist droplets move downwards along the axis of the spray drying tower. The jet nozzle sprays tangentially to the inner wall of the spray drying tower, forming an airflow layer on the side wall. This makes it difficult for the mist droplets to pass through the airflow layer and contact the side wall of the spray drying tower, reducing material adhesion to the side wall. At the same time, the airflow layer can blow away the material adhering to the side wall of the spray drying tower, reducing the cleaning frequency of the spray drying tower. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the spray drying tower structure.

[0020] Figure 3 This is a top-view cross-sectional view of the spray drying tower.

[0021] In the diagram: 10 is the feeding unit, 11 is the metering tank, 12 is the atomizer, 13 is the metering pump, 14 is the pipeline heater, 20 is the heating unit, 21 is the electric heater, 30 is the drying unit, 31 is the spray drying tower, 32 is the jet nozzle, 40 is the powder filtration and recovery unit, 41 is the cyclone separator, 42 is the bag filter, 43 is the high-efficiency filter, 44 is the powder collection box, 50 is the cleaning unit, 51 is the lifting assembly, 52 is the cleaning nozzle, 60 is the condensation unit, 61 is the condenser, 62 is the condensate recovery tank, and 63 is the reheater. Detailed Implementation

[0022] The technical solutions in the embodiments of this utility model will now be clearly and completely described with reference to the accompanying drawings.

[0023] A spray drying apparatus for volume reduction treatment of radioactive waste liquid includes a feeding unit 10, a heating unit 20, a drying unit 30, and a powder filtration and recovery unit 40. The feeding unit 10 is connected to the feed end of the drying unit 30, the heating unit 20 is connected to the air inlet end of the drying unit 30, and the powder filtration and recovery unit 40 is connected to the powder outlet end of the drying unit 30. The feeding unit 10 includes a metering tank 11 and an atomizer 12. A metering pump 13 is installed in the metering tank 11, and the liquid inlet pipe between the metering pump 13 and the atomizer 12 is located near the atomizer. A pipe heater 14 is provided at one end of the atomizer 12; the drying unit 30 includes a spray drying tower 31, the atomizer 12 is provided at the top of the spray drying tower 31, a plurality of jet nozzles 32 are provided on the inner wall of the spray drying tower 31, the jet nozzles 32 are arranged in a spiral shape, the jet direction of the jet nozzles 32 is tangent to the inner wall of the spray drying tower 31, and the jet direction is spiral upward, and a cleaning unit 50 is also provided at the top of the spray drying tower 31; the heating unit 20 includes an electric heater 21 and a drying medium, and the drying medium is introduced into the jet nozzles 32 through a ventilation pipe.

[0024] Furthermore, the drying medium is preferably nitrogen.

[0025] Furthermore, the powder filtration and recovery unit 40 includes a cyclone separator 41, a bag filter 42, a high-efficiency filter 43, and a powder collection box 44; the cyclone separator 41 is connected to the spray drying tower 31, and the powder outlet end of the cyclone separator 41 is connected to the powder collection box 44; the air outlet end of the cyclone separator 41 is connected to the bag filter 42, the powder outlet end of the bag filter 42 is connected to the powder collection box 44, and the air outlet end of the bag filter 44 is connected to the high-efficiency filter 43.

[0026] Furthermore, the powder outlet at the bottom of the spray drying tower 31 is connected to the powder collection box 44.

[0027] Furthermore, the spray drying device also includes a condensation unit 60 connected to the high-efficiency filter 43. The condensation unit 60 includes a condenser 61, a condensate recovery tank 62 connected to the water outlet of the condenser 61, and a reheater 63 connected to the air outlet of the condenser 61.

[0028] Furthermore, the spray drying device also includes a circulating fan connected to the reheater 63, which is connected to the heating unit 20, so that the drying medium can be recycled after reheating.

[0029] Furthermore, the cleaning unit 50 includes a lifting assembly 51 and a cleaning nozzle 52 disposed at the lower end of the lifting assembly 51.

[0030] Furthermore, the lifting assembly 51 is existing technology, mainly used to drive the cleaning nozzle 52 to move up and down to rinse the inner wall of the spray drying tower 31.

[0031] Furthermore, a gas pressure regulating valve (not shown in the figure) is installed on the ventilation pipe.

[0032] The described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A spray drying apparatus for volume reduction treatment of radioactive waste liquid, characterized in that: It includes a feeding unit (10), a heating unit (20), a drying unit (30), and a powder filtration and recovery unit (40). The feeding unit (10) is connected to the feeding end of the drying unit (30), the heating unit (20) is connected to the air inlet end of the drying unit (30), and the powder filtration and recovery unit (40) is connected to the powder outlet end of the drying unit (30). The feeding unit (10) includes a metering tank (11) and an atomizer (12); a metering pump (13) is installed in the metering tank (11), and a pipe heater (14) is installed at one end of the liquid inlet pipe between the metering pump (13) and the atomizer (12) near the atomizer (12). The drying unit (30) includes a spray drying tower (31), the atomizer (12) is disposed at the top of the spray drying tower (31), and a plurality of jet nozzles (32) are disposed on the inner wall of the spray drying tower (31). The jet nozzles (32) are arranged in a spiral shape, and the jet direction of the jet nozzles (32) is tangent to the inner wall of the spray drying tower (31) and the jet direction is spiral upward. A cleaning unit (50) is also disposed at the top of the spray drying tower (31). The heating unit (20) includes an electric heater (21) and a drying medium, which is introduced into the jet head (32) through a ventilation pipe.

2. The spray drying apparatus for volume reduction treatment of radioactive waste liquid according to claim 1, characterized in that: The powder filtration and recovery unit (40) includes a cyclone separator (41), a bag filter (42), a high-efficiency filter (43), and a powder collection box (44); the cyclone separator (41) is connected to the spray drying tower (31), and the powder outlet of the cyclone separator (41) is connected to the powder collection box (44); the air outlet of the cyclone separator (41) is connected to the bag filter (42), the powder outlet of the bag filter (42) is connected to the powder collection box (44), and the air outlet of the bag filter (42) is connected to the high-efficiency filter (43).

3. The spray drying apparatus for volume reduction treatment of radioactive waste liquid according to claim 2, characterized in that: The spray drying device also includes a condensation unit (60) connected to a high-efficiency filter (43). The condensation unit (60) includes a condenser (61), a condensate recovery tank (62) connected to the outlet of the condenser (61), and a reheater (63) connected to the outlet of the condenser (61).

4. A spray drying apparatus for volume reduction treatment of radioactive waste liquid according to claim 3, characterized in that: The spray drying apparatus also includes a circulating fan connected to a reheater (63) and connected to a heating unit (20).

5. A spray drying apparatus for volume reduction treatment of radioactive waste liquid according to claim 1, characterized in that: The cleaning unit (50) includes a lifting assembly (51) and a cleaning nozzle (52) disposed at the lower end of the lifting assembly (51).

6. A spray drying apparatus for volume reduction treatment of radioactive waste liquid according to claim 1, characterized in that: A gas pressure regulating valve is installed on the ventilation pipe.

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