Tail gas purification device after curing of spent fuel glass

Abstract

The utility model discloses a tail gas purification device after spent fuel glass solidification, which belongs to the technical field of tail gas purification and comprises a spraying unit and a filtering unit, the spraying unit is connected with the filtering unit in series, and the spraying unit comprises a primary tail gas inlet, a spraying chamber, a waste water port and a primary filtered tail gas outlet; the spraying chamber comprises an upper spraying pipe and a lower spraying pipe, a plurality of spraying openings are formed in the upper spraying pipe, the lower spraying pipe is branched into a plurality of small spraying pipes, the small spraying pipes are evenly distributed on the periphery of the interior of the spraying chamber, and a leaching spraying head is arranged at the end of each small spraying pipe. According to the tail gas purification device, tail gas is subjected to wet dust removal through the leaching unit and then is filtered through the filtering unit, large and small particles in the tail gas can be fully removed, and a better tail gas purification effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to tail gas purification technical field especially relates to a kind of tail gas purification devices after spent fuel glass solidification. BACKGROUND

[0002] Tail gas generated in spent fuel glass solidification process is one of the key challenges of nuclear waste treatment, which contains radioactive nuclides, acidic gases and volatile metals and other harmful components. Spent fuel glass solidification tail gas treatment is a key link of nuclear waste safety management, and needs to achieve deep removal of radioactive nuclides and harmful gases through multi-stage purification. Current technology can control tail gas radioactivity emission at a very low level (such as iodine-129 removal rate > 99.99%), but problems such as high temperature corrosion and tritium treatment still need continuous innovation.

[0003] The prior art usually designs a special purification process according to the characteristics of the tail gas, such as Chinese patent CN117463136 A discloses a method for purifying waste salt molten glass solidification flue gas in a short process, and discloses its purification device including a spraying unit, an electric filter dust removal unit, a catalytic combustion unit and other specific components, but the design of the electric filter dust removal unit is more suitable for the use of small equipment, and the risk of electric filter dust removal is higher in large-scale dust removal process. UTILITY MODEL CONTENT

[0004] The technical problem to be solved by the utility model is to design a novel tail gas purification device after spent fuel glass solidification, which has high purification degree and higher safety.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme: a tail gas purification device after spent fuel glass solidification, comprising a spraying unit and a filtering unit, the spraying unit and the filtering unit are connected in series, the spraying unit comprises a primary tail gas inlet, a spraying chamber, a waste water outlet and a primary filtered tail gas outlet; the spraying chamber comprises an upper spraying pipe and a lower spraying pipe, a plurality of spraying ports are arranged on the upper spraying pipe, the lower spraying pipe is branched into a plurality of small spraying pipes, the small spraying pipes are uniformly distributed around the inside of the spraying chamber, and a rinsing nozzle is arranged at the end of each small spraying pipe.

[0006] Further, the spraying chamber is arranged inside the spraying unit, and a hollow silk screen is arranged between the bottom outside of the spraying chamber and the spraying unit.

[0007] Further, a filter layer is arranged on the inside of the bottom of the spraying chamber.

[0008] Further, the waste water outlet comprises a first waste water outlet and a second waste water outlet, and the first waste water outlet is arranged at the bottom center of the spraying unit.

[0009] Further, the bottom of the spraying unit is provided with two wastewater level detection windows, and a first water level detector and a second water level detector are respectively arranged in the two wastewater level detection windows.

[0010] Further, the first water level detector is arranged at the upper portion of the first wastewater outlet, and the second water level detector is arranged at the upper portion of the second wastewater outlet.

[0011] Further, the filtering unit comprises a primary filtering tail gas inlet, a filtering chamber, a back flushing device, a third wastewater outlet and a tail gas outlet, and the primary filtering tail gas inlet is connected with the primary filtering tail gas outlet of the spraying unit.

[0012] Further, the back flushing device is arranged at the bottom of the filtering unit and comprises a water inlet and a back flushing pipe, and a plurality of back flushing openings are arranged on the back flushing pipe.

[0013] Further, a baffle is arranged between the outside of the bottom of the filtering chamber and the filtering unit 2.

[0014] Beneficial effects: the tail gas purification device after the glassification of spent fuel is divided into a washing unit and a filtering unit in the application, and the two units are connected in series, the tail gas is subjected to wet dust removal through the washing unit and then is filtered through the filtering unit, so that the large and small particles in the tail gas can be fully removed, and better tail gas purification effect can be achieved.

[0015] Meanwhile, the back flushing device is arranged in the filtering unit, so that the filtering unit can be flushed without disassembly, the filtering unit is prevented from being blocked, the filtering effect is good, and safety is further improved. DETAILED DESCRIPTION

[0016] Figure 1 Fig. 1 is a structural schematic view of a spraying unit of the application.

[0017] Figure 2 Fig. 4 is a bottom layout view of the spraying unit of the application.

[0018] Figure 3 Fig. 5 is a structural schematic view of a filtering unit of the application.

[0019] wherein 1 is a spraying unit, 10 is a primary tail gas inlet, 11 is a primary filtering tail gas outlet, 12 is a hollow silk screen, 13 is a spraying chamber, 14 is an upper spraying pipe, 15 is a washing nozzle, 16 is a lower spraying pipe, 161 is a small spraying pipe, 17 is a filtering layer, 18 is a first wastewater outlet, 19 is a second wastewater outlet, 101 is a first water level detector, 102 is a second water level detector, 2 is a filtering unit, 21 is a primary filtering tail gas inlet, 22 is a baffle, 23 is a filtering chamber, 24 is a back flushing device, 25 is a third wastewater outlet, and 26 is a tail gas outlet. DETAILED DESCRIPTION

[0020] In order to strengthen the understanding of the utility model, the utility model will be described in detail below in combination with embodiments and drawings, and the embodiments are only used for explaining the utility model and do not constitute limitation to the protection scope of the utility model.

[0021] As Figure 1 The figure shows a spraying unit in a tail gas purification device after glassification of spent fuel, and specifically comprises a primary tail gas inlet 10, a spraying chamber 13, a waste water outlet and a primary filtered tail gas outlet 11.

[0022] The spraying chamber 13 is arranged inside the spraying unit 1, and a hollow silk screen 12 is arranged between the bottom outside of the spraying chamber 13 and the spraying unit 1. Figure 1 The tail gas enters the spraying unit 1 through the primary tail gas inlet 10 as shown by the arrow and moves upwards, and enters the spraying chamber 13 after passing through the hollow silk screen 12.

[0023] The inside of the spraying chamber 13 is provided with an upper spraying pipe 14 and a lower spraying pipe 16, the upper spraying pipe 14 is provided with a plurality of spraying openings, water can be sprayed downwards through the spraying openings, the lower spraying pipe 16 is branched into a plurality of small spraying pipes 161, the small spraying pipes 161 are uniformly distributed around the inside of the spraying chamber 13, and a rinsing nozzle 15 is arranged at the end of each small spraying pipe 161.

[0024] According to a preferred embodiment of the utility model, six small spraying pipes 161 are arranged, which can achieve a good spraying effect.

[0025] A filter layer 17 is arranged at the inside of the bottom of the spraying chamber 13.

[0026] After the tail gas enters the spraying chamber 13, the upper spraying pipe and the lower spraying pipe spray water at the same time, and the large particles in the tail gas are removed by wet dust removal. The waste after being wetted moves downwards and is left in the filter layer 17 after passing through the filter layer 17, and the waste water and other tail gas move downwards. The waste water flows out of the spraying unit through the waste water outlet, and the waste gas flows into the next filtering unit through the primary filtered tail gas outlet 11.

[0027] According to a preferred embodiment of the utility model, as Figure 2 The waste water outlet comprises a first waste water outlet 18 and a second waste water outlet 19, the first waste water outlet 18 is arranged at the bottom center of the spraying unit 1, the second waste water outlet 19 is arranged at one side of the first waste water outlet 18, and the two are on a horizontal line, and the pore diameter of the second waste water outlet 19 is larger than that of the first waste water outlet 18. The design is because the bottom of the spraying unit is arc-shaped, which accelerates the flow of waste water and does not cause the accumulation of waste water at the bottom.

[0028] According to a preferred embodiment of the utility model, as Figure 1 and Figure 2As shown, two wastewater level detection windows are provided at the bottom of the spray unit 1, and a first water level detector 101 and a second water level detector 102 are respectively placed in the two wastewater level detection windows. The first water level detector 101 is located above the first wastewater outlet 18, and the second water level detector 102 is located above the second wastewater outlet 19, which facilitates the monitoring of wastewater volume.

[0029] The spray unit 1 and the filter unit 2 are connected in series. The filter unit 2 includes a primary filtration exhaust gas inlet 21, a filter chamber 23, a backflushing device 24, a third wastewater outlet 25, and an exhaust gas outlet 26, wherein the primary filtration exhaust gas inlet 21 is connected to the primary filtration exhaust gas outlet 11 of the spray unit 1. The exhaust gas flows out through the primary filtration exhaust gas outlet 11 and then enters the filter unit 2 through the primary filtration exhaust gas inlet 21.

[0030] like Figure 3 As shown, the filter chamber 23 is located in the upper part of the filter unit. The filter chamber 23 is cylindrical and covered with a cylindrical filter cloth. A baffle 22 is provided between the bottom of the filter chamber 23 and the filter unit 2. The edge of the baffle 22 extends to the bottom of the filter chamber 23 near the center of the bottom circle.

[0031] The exhaust gas flows upwards through the unobstructed space in the middle of the baffle 22 and enters the filter chamber 23. After being filtered by the filter cloth, the exhaust gas is then discharged through the exhaust outlet 26.

[0032] During use, the filter cloth becomes clogged after prolonged use and is difficult to clean. Therefore, an automatic backflushing device 24 is installed at the bottom of the filter chamber 23. The backflushing device 24 includes a water inlet and a backflushing pipe, and the backflushing pipe is provided with several backflushing ports. When the filter cloth needs to be cleaned, the backflushing device can be turned on to clean the filter cloth.

[0033] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A spent fuel glass solidification post-cleaning device comprising a spraying unit (1) and a filtering unit (2), characterized in that, The spray unit (1) is connected in series with the filtering unit (2), the spray unit (1) comprises a primary tail gas inlet (10), a spray chamber (13), a waste water outlet and a primary filtering tail gas outlet (11); The spray chamber (13) comprises an upper spray pipe (14) and a lower spray pipe (16), the upper spray pipe (14) is provided with a plurality of spray nozzles, the lower spray pipe (16) is branched into a plurality of small spray pipes (161), the small spray pipes (161) are uniformly distributed around the inside of the spray chamber (13), and the end of each small spray pipe (161) is provided with a washing spray head (15).

2. The spent fuel glassification exhaust gas purification apparatus according to claim 1, wherein The spray chamber (13) is arranged in the inside of the spray unit (1), and a hollow silk screen (12) is arranged between the bottom outside of the spray chamber (13) and the spray unit (1).

3. The spent fuel glassification exhaust gas purification apparatus according to claim 1, wherein The bottom inside of the spray chamber (13) is provided with a filter layer (17).

4. The spent fuel glassification exhaust gas purification apparatus according to claim 1, wherein The waste water outlet comprises a first waste water outlet (18) and a second waste water outlet (19), the first waste water outlet (18) is arranged at the bottom center of the spray unit (1).

5. The spent fuel glassification exhaust gas purification apparatus according to claim 1, wherein Two waste water level detection windows are arranged at the bottom of the spray unit (1), and a first water level detector (101) and a second water level detector (102) are respectively arranged in the two waste water level detection windows.

6. The spent fuel glassification exhaust gas purification apparatus according to claim 5, wherein The first water level detector (101) is arranged at the upper part of the first waste water outlet (18), and the second water level detector (102) is arranged at the upper part of the second waste water outlet (19).

7. The spent fuel glassification exhaust gas purification apparatus according to claim 1, wherein The filtering unit (2) comprises a primary filtering tail gas inlet (21), a filtering chamber (23), a back flushing device (24), a third waste water outlet (25) and a tail gas outlet (26), and the primary filtering tail gas inlet (21) is connected with the primary filtering tail gas outlet (11) of the spray unit (1).

8. The spent fuel glassification exhaust gas purification apparatus according to claim 7, wherein The back flushing device (24) is arranged at the bottom of the filtering unit (2) and comprises a water inlet and a back flushing pipe, and a plurality of back flushing nozzles are arranged on the back flushing pipe.

9. The spent fuel glassification exhaust gas purification apparatus according to claim 7, wherein A baffle (22) is arranged between the bottom outside of the filtering chamber (23) and the filtering unit (2).

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