JPS6245355A - Apparatus for removing dust - Google Patents

Abstract

PURPOSE:To enhance dust removal efficient by forming dust particles into mist, by providing a condenser forming mist by using dust as a nucleus and an electric precipitator for ionizing the mist and moving the ionized mist to a dust collecting electrode to remove the same in a communicated state. CONSTITUTION:When an OFF-gas supply system 3 and a condenser 4 are operated, the liquefiable components such as steam, NOX or the like in the OFF-gas are condensed under cooling and liquefied to be formed into mist having dust as a nucleus and this mist is sent into the space between a linear electrode 7 and a dust collecting electrode 8. Therefore, the mist is ionized by the corona discharge phenomenon of a discharge electrode to be moved to the surface of the dust collecting electrode 8. The each mist on the dust collecting electrode 8 becomes large and subsequently flowed down under its own wt. to perform the taking-in of the mist in an ionized atmosphere. The taken-in mist is collected in a lower casing 10 and subsequently discharged from a drain line 16, as shown by the arrow.

Description

Detailed Description of the Invention "Industrial Applicability!f" The present invention relates to a dust removal device, and in particular, a device for cooling and condensing liquefied components contained in aerosols such as off-gas generated in nuclear fuel cycle plants. The present invention relates to a dust removal device having a function of converting dust into mist.

[Conventional technology and its problems] Electrostatic precipitators applied to dust removal equipment have superior dust collection performance compared to other dust collection methods, and can collect even small particles. It is said to be possible. For this reason, for example, what is the effectiveness of capturing and removing radioactive i and gamma particles in the off-scrap by various treatments of radioactive materials generated in nuclear fuel cycle plants? has been done.

However, in the conventional dust removal device, the electric field strength for generating gorona radiation is limited for reasons such as preventing reverse polarization phenomenon and re-scattering phenomenon1), for example, 3
It is suppressed to about K V / ctn, and air 2J
The particle size of the sol (mist) is 10 μm or more (LO') 6)
It is possible to collect dust with a good J rate, but if it is about 1 μm, the dust collection rate will be about 99% (102 in case of decontamination coefficient J9), and it is difficult to increase it beyond this level. It becomes difficult. Furthermore, if the particle size is small, in the submicron range (1.0 μm or less), the dust collection efficiency will drop significantly. However, in such a case, the presence of radioactive particles that cannot be removed may cause problems such as an increase in the amount of radiation exposed to the employee's glands, etc. Sign.

: [-]Object of the present invention and means for achieving it
The purpose of this invention is to effectively solve the problems of the prior art.

In order to achieve this goal, in the dust removal device of the present invention, a DC voltage is applied to discharge the Ti electrodes (-COCR-+1) to generate ionization. If you leave it in an atmosphere, there will be liquefied components such as moisture in the fugas.
1J: Condensate this liquefied component by publishing Redeiroko; 3
11) to make it into a mist state, and then send it into the ionizing atmosphere described in 41j to ionize the mist, 11,
The dust moves a lot to the electrode, and the dust is removed by flowing along the dust collection electrode. Furthermore, if NOx is contained in this off-scum, it will be absorbed by the mist and the ionization of the mist will be promoted.

[One Embodiment-1] Hereinafter, one embodiment of the guest removal device of the present invention will be described based on FIG. 1.

In Figure 1, the symbol l is an electrostatic precipitator, and the symbol 2 is a high 1
Ti pressure supply system, sign discharge 3 is off scum supply system, code 1; yo, doubt 11ii 'A: 'i, 1'jji 5: yo flow! 1 (1
Water pickup system for sampling, pruning 6: Installed as necessary.
Romizu I! \Mero with the air supply system, and 1) 1j electric dust fjg l is Takaichi F1-() (the stray pole 7 connected to the yarn feeder 2 and the stray pole 7) Is there a cylindrical shape surrounding it? u! +'li 3 etc...:, 47
η is formed, and the space between I-1′! (!The casing 9 and the lower caisson slot 10 are separated from each other by the casing 9 and the lower caisson 9).
1, Pump from the water storage tank 11 of system 5 for the flow water film + l < system 5! A link-like link 1111 to 1111 to 13 or 14 to 1 is formed between the electrode 8 and a part of the cane/liquid 9 to collect water. Then, the overflowing water from the link-shaped groove 13 flows down onto the circular inner surface of the dust collection electrode 8 at iF>-, forming a running water film, and the water flows down to the flow meter 141. detected by
ノ41 It's like a ladle.

Further, the drain line 15 of the condenser 1 connected to the off-gas cofeeding system 3 (1-5) is connected to the drain line I6 of the lower caisson 10.

Furthermore, the exhaust system 17 is connected to the upper part 1, j4. A scattering measuring device 18 is connected between the exhaust system 17 and the off-gas supply system 3H:), so that the state of capturing fine particles (')) can be clearly detected at V;;:. ing.

ri J';, 1iii.
For example, insert a thin ffl bar-shaped cross-section in (to move the foot forward) -:, :g). ing.

On top of this ;) i; When the high voltage supply system 2 connected to the i device 1 is in continuous operation and the guest removal device is (+'4') When the off-cass supply system: udo condensation: storage unit 1 is activated, the condensable component that is long in the off-cass, that is, water vapor, the liquefied component of \OX''S-, is cooled and condensed. The mist is liquefied and becomes a mist with Tast as the core, and is sent from the F section Kenonog IO to between the linear pole 7 and the dust collection electrode 8 by the blower 15. Therefore, the mist is caused by the corona discharge phenomenon of the main discharge peak. The mist is ionized and moved to the surface of the dust collection TL electrode 8.Then, each mist on the dust collection electrode 8 becomes larger from a water droplet shape, and then flows down due to its own weight. ) When the mist that is absorbed into the ionized atmosphere is absorbed into the ionized atmosphere, the captured mist is collected in the lower casing 10 and then drained from the drainage line 16 to the drain line 16. As shown by the arrow in Figure 1, the waste is discharged and processed.

The collected mist is constantly swept away by its own weight and removed from the ionized atmosphere.
5. If the water supply system 5 for the flowing water film is in operation, the dust collection electrode 8
A running water film is formed on the inner surface of the dust collection electrode 8, which ionizes and causes the mist to flow downward, thereby preventing the mist from accumulating on the surface of the dust collecting electrode 8.

In addition, to provide a supplementary explanation about the mist formation by the condenser 4, if there are few liquid components in the off-scrap, water,
Then, the air supply system 6 is activated, and the mixed off-gas and water vapor are sent to the condenser 4 (1-) to stabilize the generation of mist. In this case, it becomes the carrier fluid for the off-scrap (J mist).In addition, if the off-scrap and the mist are sent into the electrostatic precipitator 1 in a mixed state, the ionization of the mist in the ion atmosphere (step speed 1 When the mobility of the dust collection electrode 8 and the flowing water film is in the 1-direction, the cause of the de-ionization phenomenon and the re-scattering phenomenon disappears.

Furthermore, the performance of these devices may deteriorate due to the particle counter 1.
Each time the off-gas supply system 3 and the exhaust system I7 are operated by operating the off-gas supply system 3 and the exhaust system I7, inspection can be carried out from time to time.

j′′Experimental Example” For a 1u air collection [m4 dust collection electrode with an inner diameter of 30 cm, mist, etc. is sent into it, and as shown in Figure 2, #i i'k of the mist, etc. is set as a variable. The decontamination count was calculated when

In this case, the applied voltage was 751<V and 45KV (5KV/cm and 3KV/(m) in terms of average electric field strength, the scrap line velocity was 1.Om/sec, and a flowing water film was formed.
Ja is 0.5 m" 7 o'clock. In order to keep the surface condition of the dust collecting electrode constant, a running water film was formed. In addition, a running water film was formed on the dust collecting electrode. If the electric field strength is increased, the discharge phenomenon can be canceled out.
I found out that the final result is (ρ-dynamic or stable).For this reason,
Electric V in Figure 2? The strength of 5 K\'/cm is considerably higher than that of 91.1.

How are you? J. From the results shown in Figure 2, the following is clear. In particular, for medium fine particles, divided by k[J: high performance, for fine particles of 0.1 F or less, rj is two orders of magnitude or more compared to das + - r + s. There is a removal effect above. The electric field strength is 5 KV,...'
If the value is less than cm, the division +: coefficient 10” is a good result.
l, H is done.

"Effects of the Invention" As explained above, according to the dust removal device of the present invention, the following excellent effects can be achieved.

■Using the presence of liquefied moisture, etc. in the off-gas, this liquefied component is defected and turned into a mist with dust as the nucleus, and the 1000 mist is collected.
Second, fine particles 1- can be made into a mist to reduce the amount of small particles.
7. (1) Improving the removal efficiency; (2) By turning the mist into a mist, the ionization of the mist can be promoted, and the mobility to the dust collecting electrode can be increased.

■、Two! The removal efficiency of the Σ1-filter for fine particles in the micron scale can be dramatically increased by
3) The mist of 2 (5H4μ city pole) gradually grows due to its own weight, renews the surface of the dust collection electrode and prevents the occurrence of a deposition phenomenon. Can be suppressed.

, according to 'SriJ, a constant coronal sheet weight is required (
In addition to increasing the flow rate of treated waste and achieving high efficiency, it is also possible to prevent sparks from occurring within the electrostatic precipitator and to ensure stable operation.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing an embodiment of the guest removal device of the present invention, and FIG. 2 is a relationship curve diagram between a dust state or a mist state and a decontamination coefficient. l...Electric precipitator, 2...High voltage (1!, Yarn feeding, 3 Off-scum supply system, 1 Condenser, 5 Water supply system for running water membrane, 6 Water vapor (Yam feeding, 7 Linear:
, 8 dust collection 1u pole, 94 part casing, 1o/lower j
1]<Casing, II Storage 1 (tank, 12...
Pump, I3 ・Linked i14, l 1i...
Flow jIt meter, 15 Trueno line, 16 Li1 water line>, 17 ・Exhaust system, I8 ・Particle measurement 2;:
. Applicant Ishikawajima Harima City], Industry Co., Ltd. 1, Figure 1 Figure 2 Particle size (ALm)

Claims (1)

[Claims] A condenser that cools and condenses the liquefied components contained in the off-gas to form a mist with dust as the nucleus, and a discharge electrode that generates a corona discharge by applying a DC voltage to create an ionized atmosphere and condense the condensate. A dust removal device characterized in that it is connected to an electric precipitator that ionizes the mist generated by the device and moves it to a dust collection electrode for removal.