CN209865971U

CN209865971U - Atomizing prilling tower

Info

Publication number: CN209865971U
Application number: CN201920440850.1U
Authority: CN
Inventors: 游新锋; 李腾
Original assignee: China Institute of Atomic of Energy
Current assignee: China Institute of Atomic of Energy
Priority date: 2019-04-03
Filing date: 2019-04-03
Publication date: 2019-12-31
Anticipated expiration: 2029-04-03

Abstract

The utility model provides an atomizing prilling tower. The atomizing and granulating tower comprises a tower body, an atomizing disc, a feeding pipe, a discharge port, an air inlet, an air outlet and a dust collecting port; the atomizing disc is positioned in the tower body and divides the tower body into an air inlet section and an atomizing and granulating section, and a plurality of air inlets are formed in the atomizing disc and a plurality of slurry spray heads are arranged on the atomizing disc; the air inlet is arranged on the air inlet section; the feeding pipe penetrates through the tower body and is communicated with the slurry spray head; the discharge port and the dust collecting port are respectively arranged on two sides of the tower body; the exhaust port is located at the top of the tower body, and a dust filter screen is arranged on the exhaust port. The utility model discloses an atomizing granulation tower has adopted unique project organization, and the particularity mating reaction between especially the main project organization, the convenient main preparation process who has realized PAN-KNiFC adsorbent granule is showing and has simplified control and operation, has gained good application effect.

Description

Atomizing prilling tower

Technical Field

The utility model belongs to the material shaping field, in particular to atomizing prilling tower.

Background

With the development of nuclear power in China, a large amount of low-level waste liquid is generated in the back-end treatment of nuclear fuel and the operation of a nuclear power plant. In recent years, national regulatory authorities and the public have become more and more concerned about radioactive effluent discharge, especially after an accident in 3.11 fukushima, japan. The emission regulation of radioactive effluents in China is more strict, for example, the regulation department requires that the total beta of low-level waste liquid of inland nuclear facilities is less than 30Bq/L after being treated, and then the low-level waste liquid can be discharged. The low-level tritium-containing wastewater can be discharged by steam carried at high altitude when the total beta of the treated low-level tritium-containing wastewater is less than 10 Bq/L. This requirement is much higher than the recommended IAEA standard. This puts a very high demand on the treatment technical level and capacity of the low-level radioactive waste liquid in China.

Research on radioactive wastewater treatment by applying PAN-KNiFC granular adsorbent such as cortex dictamni glow and the like shows that PAN-KNiFC can effectively remove Cs in water⁺However, a method for producing the adsorbent has not been disclosed.

There are studies on PAN-MnO₂/TiO₂A process for preparing Sr adsorbent by peristaltic pump₂/TiO₂And the mixed solution of PAN is dripped into the curing liquid by a proper dripper to be cured to form a droplet-shaped particle ball. Proved by verification, the method has the following problems: (1) most of the formed particles are in a liquid drop shape, the tail end of each particle is provided with a small tail which is like a tadpole and is not spherical, so that the small tail is broken in practical application, fine fragments are brought into effluent liquid, and radioactive leakage is caused. (2) The method has very low granulation efficiency, is not suitable for real engineering application and has higher cost. (3) The particle diameter formed by the method is larger and is about 2-6mm, the exchange time of the adsorbent is long during actual use, the adsorbent is wasted, and the matching problem is too many. The method is determined by the preparation process and equipment of the dripper, because the minimum aperture of the dripper at present can only be 0.1mm, the dripper is too small and has high machining difficulty, and the dripper is limited by a mixture in the dripper, is easy to block and cannot discharge to form the dripper.

SUMMERY OF THE UTILITY MODEL

In order to solve the above-mentioned problem that the preparation technology that can be used to PAN-KNiFC adsorbent exists now, the utility model provides an atomizing prilling tower.

The atomizing and granulating tower comprises a tower body, an atomizing disc, a feeding pipe, a discharge port, an air inlet, an air outlet and a dust collecting port; the atomizing disc is positioned in the tower body and divides the tower body into an air inlet section and an atomizing and granulating section, and a plurality of air inlets are formed in the atomizing disc and a plurality of slurry spray heads are arranged on the atomizing disc; the air inlet is arranged on the air inlet section; the feeding pipe penetrates through the tower body and is communicated with the slurry spray head; the discharge port and the dust collecting port are respectively arranged on two sides of the tower body; the exhaust port is located at the top of the tower body, and a dust filter screen is arranged on the exhaust port.

According to one embodiment, the diameter of the atomizing disk may be 20-100 mm.

According to one embodiment, the slurry head may have an inner diameter of 0.5 to 3 mm.

According to one embodiment, the inner diameter of the air intake hole may be 0.5-5 mm.

The utility model discloses an atomizing granulation tower has adopted unique project organization, and the particularity mating reaction between especially the main project organization, the convenient main preparation process who has realized PAN-KNiFC adsorbent granule is showing and has simplified control and operation, has gained good application effect.

Drawings

Fig. 1 is a schematic structural diagram of an atomizing granulation tower according to an embodiment of the present invention.

Fig. 2 is a schematic view of an atomizing disk of an atomizing granulation tower according to an embodiment of the present invention.

1. The device comprises an atomizing disc, a feeding pipe, a discharging port, a gas inlet, a gas outlet, a dust collecting port, a gas inlet section, an atomizing and granulating section, an air inlet and a slurry nozzle, wherein the feeding pipe is 2, the discharging port is 3, the gas inlet is 4, the gas outlet is 5, the dust collecting port is 6, the gas inlet section is 7, the atomizing and granulating section is.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components.

In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in schematic form in order to simplify the drawing.

Although the present invention has been described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplify the embodiments of the present invention, and should not be construed as a limitation of the present invention. The various components in the drawings are not to scale in order to clearly illustrate the details of the various components, and so the proportions of the various components in the drawings should not be taken as limiting.

The atomizing and granulating tower of the utility model comprises a tower body, an atomizing disc 1, a feeding pipe 2, a discharging port 3, an air inlet 4, an air outlet 5 and a dust collecting port 6; the atomizing disc 1 is positioned in the tower body and divides the tower body into an air inlet section 7 and an atomizing and granulating section 8, and a plurality of air inlets 9 and a plurality of slurry nozzles 10 are formed in the atomizing disc 1; the air inlet 4 is arranged on the air inlet section 7; the feeding pipe 2 penetrates through the tower body and is communicated with the slurry spray head 10; the discharge port 3 and the dust collecting port 6 are respectively arranged at two sides of the tower body; the exhaust port 5 is located at the top of the tower body, and a dust filter screen is arranged on the exhaust port 5.

The utility model discloses according to the physical change that takes place in PAN-KNiFC mixed slurry property and the drying process, adopted including atomizing disk 1, discharge gate 3, mouth 6 is collected to the dust, thick liquids shower nozzle 10, the dust filter screen of gas vent 5 etc. design including, mutually support between these project organization, convenient realization the emission of the volatile component in PAN-KNiFC adsorbent granule manufacturing process, the collection is blocked to the tiny granule, the atomizing-dry of PAN-KNiFC mixed slurry, the shaping and the collection of PAN-KNiFC bobble, need almost not external intervention during it, consequently, the control and the operation of main preparation process have been showing and have been simplified.

According to an example, the diameter of the atomizing disk 1 may be 20-100 mm.

According to an example, the slurry head 10 may have an inner diameter of 0.5-3mm, and may form spherical droplets of a certain size, thereby obtaining suitably sized PAN-KNiFC adsorbent particles.

According to one example, the inner diameter of the air inlet hole 9 may be 0.5-5mm, which is advantageous for obtaining a proper air flow shear force.

Adopt the utility model discloses an atomizing prilling tower makes PAN-KNiFC adsorbent granule, its main process as follows:

(1) the atomizing and granulating tower is obliquely arranged (the inclination degree is that the included angle between the central axis of the tower body and the horizontal plane is 30-45 degrees), so that the discharge port 3 is positioned at the lower side of the tower body, and the dust collecting port 6 is positioned at the upper side of the tower body.

(2) Hot air with the temperature of 50-60 ℃ is introduced through the air inlet 4.

(3) The PAN-KNiFC mixed slurry is conveyed to the slurry nozzle 10 through the feed pipe 2 and sprayed to the atomizing granulation section 8 through the slurry nozzle 10.

Under the action of the rapid airflow shearing force, the PAN-KNiFC mixed slurry is atomized to form spherical small droplets, the spherical small droplets form a stable atomization-drying area at the middle lower part of the atomization granulation section 8 under the action of gravity and airflow buoyancy, and the spherical small droplets continuously rotate, fluctuate up and down and dehydrate and dry in the area to gradually form more smooth and stable PAN-KNiFC small balls.

In the atomization and drying processes, volatile components in the PAN-KNiFC liquid drops can be volatilized rapidly, and the volatilized components are conveyed to a tail gas treatment system through a dust filter screen at the top under the action of an air flow.

In addition, part of the liquid drops may form fine particles due to collision and the like during the atomization and drying processes, and the fine particles may rapidly float to the top of the atomization granulation tower to be blocked and intercepted by the dust filter screen, so as to be discharged from the dust collection port 6 and collected.

(5) After the PAN-KNiFC pellets are basically completely dried and solidified, the pellets float upwards due to the reduction of density under the action of the drying air flow, form a pellet product area at the upper part, are continuously accumulated, and slide and collected at the discharge port 3.

At present, the utility model discloses an atomizing prilling tower has been applied to and makes PAN-KNiFC adsorbent. Proved by verification, the adsorption equipment adopting the adsorbent has the treatment capacity of 150-200L/h low-level radioactive waste liquid, and has treated about 700m at present³And (5) low-level discharge of waste liquid.

For total¹³⁷Cs is about 4X 10²Bq/L-10³Bq/L low-level waste liquid, and the total treated waste liquid is prepared by adopting the adsorbent manufactured by the atomization prilling tower¹³⁷Cs is as low as 0.3Bq/L, the total beta is about 3-10Bq/L by combining the original cation resin column, the level of radioactivity near zero emission is achieved, and the requirement of safe emission is completely met.

Due to the use of the PAN-KNiFC adsorbent, the replacement frequency of the cationic resin is reduced from 1 time in 1 week to 1 time in 3-4 months under the condition of not changing the original process equipment, the waste liquid treatment capacity is improved by at least 10 times, the irradiated dose and the operation risk of operators are reduced, and the production efficiency is obviously improved. Plays an important role in the safe, continuous and stable operation of the plant.

Although a few embodiments in accordance with the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.

Claims

1. An atomizing prilling tower, characterized in that: the atomizing and granulating tower comprises a tower body, an atomizing disc, a feeding pipe, a discharge port, an air inlet, an air outlet and a dust collecting port; the atomizing disc is positioned in the tower body and divides the tower body into an air inlet section and an atomizing and granulating section, and a plurality of air inlets are formed in the atomizing disc and a plurality of slurry spray heads are arranged on the atomizing disc; the air inlet is arranged on the air inlet section; the feeding pipe penetrates through the tower body and is communicated with the slurry spray head; the discharge port and the dust collecting port are respectively arranged on two sides of the tower body; the exhaust port is located at the top of the tower body, and a dust filter screen is arranged on the exhaust port.

2. The atomizing prilling tower of claim 1, wherein: the diameter of the atomizing disk can be 20-100 mm.

3. The atomizing prilling tower of claim 1 or 2, wherein: the inner diameter of the slurry spray head is 0.5-3 mm.

4. The atomizing prilling tower of claim 1 or 2, wherein: the inner diameter of the air inlet hole is 0.5-5 mm.

5. The atomizing prilling tower of claim 3, wherein: the inner diameter of the air inlet hole is 0.5-5 mm.