JPS6067894A - Filter device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a filter device for a radioactive contaminated gas treatment system in a nuclear power plant.

Conventional equipment includes a pull-out adsorbent exchange system called the tray type and a non-gasket type called the heka type, but the tray type has a large number of exchange trays and has a large sealing surface, making it difficult to work and seal reliability. There is a decrease in On the other hand, the Heka type had the disadvantage that it contained a large amount of activated carbon, resulting in a large amount of contaminated carbon, and required special equipment for charging and discharging the activated carbon.

[Purpose of the invention]

The purpose of the present invention is to provide a gas treatment filter that improves the reliability of cooling by effectively utilizing adsorbents such as activated carbon, reducing the amount of contaminated adsorbents, reducing the number of seals, and employing reliable seals. It is on offer.

[Summary of the invention]

The present invention provides an adsorber that smooths the flow of gas, reduces internal pressure loss as much as possible, and increases the same adsorption efficiency at all positions, and the adsorber is removable from the filter for easy handling. This filter uses magnetic fluid with good sealing properties on the sealing surface of the filter and adsorber.

[Embodiments of the invention]

FIG. 1 is a gas processing system diagram for removing radioactive gas in a nuclear power plant having a filter device of the present invention. In the figure, reference numeral 1 denotes a reactor containment structure, which is connected to a casing 3 via a duct 2.

A dehumidifier 4 is detachably fixed to the casing 3. 5 is a water seal U-seal, one of which is fixed to the casing 3;
Its mouth is open to the inside of the dehumidifier 4, the other end is supported by the drain port 6, the mouth is opened to the drain hole 6, and has sealing water inside. 7 is a blower, which is removably fixed to the casing 3 together with the heater 8; 9, 10, and 12 are filters, which are removably fixed to the casing 3; 11 is an adsorbent; is removably fixed to the casing 3, 13 is a short pipe, and one is attached to the casing 3.
, the other is removably fixed to the blower 14 with a notch and bolt (not shown), 16 is a stack connected to the blower 14 via 15 duct, 19 is a temperature sensor, and one end is fixed to the casing 3 The other end is connected to the controller 18. 17 is a hygrometer, one end of which is fixed to the casing 3, and the other end of which is a controller 18.
18 is the controller and heater 8 is connected to
, connected to the blower 7. Next, the functions will be explained. When coolant is lost in the reactor containment structure 1 due to a rupture of the primary system piping, etc., radioactive gas is generated inside the reactor containment structure 1.

This is sucked by the blower 14 by a signal not shown. Gas therefore enters the casing 3 via the duct 2. The gas is dehumidified by a dehumidifier 4, further reduced by 7 degrees by a heater 8, and passed through filters 9 and 10.

However, radioactive substances of, for example, 0.3 μm or less in the gas are not removed, so in order to prevent the fine powder of the adsorbent in the adsorber, which is adsorbed by activated carbon, from being released into the atmosphere, A filter 12 is provided downstream to clean the gas, which is sucked into the blower 11 and discharged via the duct 15 from the stack 16 to the atmosphere.

These series of gas flows are for emergencies, and there is no gas flow normally. However, in order to maintain the normal performance of activated carbon and filters 9, 10, 12, it is necessary to keep the humidity low (100% to 70% or less), so although the heater 8 is constantly operating, fluid flow occurs. If not, there will be no heat-up effect, so blow dry air with the blower 7. This is detected by the hygrometer 17, and the controller 18 causes the heater 8 and the blower 7 to operate. In addition, the temperature is detected by a temperature detector 19 at the front of the adsorber 11, and a signal is sent to the controller 18 to prevent the temperature from becoming abnormally high.
is controlled.

FIG. 2 is a cross-sectional view taken along the arrow E in FIG. 1, and is a plan view of the adsorption device according to the present invention. In the figure, 21 is a stopper welded to the casing 3. 22 is a seal provided on the stopper 21, and 23 is a block that is welded to the casing 3 and screwed into a push bolt 24. 25 is a nokunching metal in front.

The rear end and lower surface (not shown) are respectively provided with guides 26a and b.
The upper surface is in contact with a cover (not shown) through a seal by bolt fixing. 27 is sealed with a bolt 28 at the door. Next, the functions will be explained. In the figure, the gas flowing in the air supply direction is collected at the inlet of the adsorber 11 by a concave shape as shown in section C to reduce inflow resistance and facilitate flow, and enters the air supply port.

The gas entering the air supply port enters from the punching metal 25 and passes through the adsorbent CH. At this time, isotopes of elemental iodine and methyl iodide are adsorbed in the gas, and the purified gas is discharged from the central and both side exhaust ports. Generally, when the gas changes direction at right angles, it increases the resistance to the vortex and increases the power of the suction blower. For this reason, it is better to change the direction of the gas as smoothly as possible by making the guide 26b, which is where the supply air hits, be chevron-shaped to change the direction of the gas. In addition, since there is a difference in the passage distance of the adsorbent CH in the thickness direction of the adsorbent CH and the flow of the fluid (which has a certain degree of inclination), if the guide 26b is perpendicular to the gas flow, a difference will naturally occur as described above, so the guide 26b is a mountain shape with an arbitrary angle. In addition, since the gas cannot change direction at right angles, the gas inlet has a guide 26a.
As in, it's like a slope + a death. Next, the attachment of the adsorption device 11 to the casing 3 will be explained. The adsorber 11 is set in two positions outside the casing 3.

This position is set so that an equal gap is created between the stopper 21 and the block 230 (at this time, remove the push bolt 24 or return it so that it does not come out from the block 23), and the suction device is moved as described later. It is side-shifted by a device and installed inside the casing 3. Next, push bolt 2
4, strongly press the adsorber 11 against the stopper 21. By doing this, the seal 22 provided on the cyst flange 21 acts to seal the contact surface between the stopper 21 and the adsorber 11, and the gas flows into the adsorber 11 through a predetermined vent. The seal 22, which will be described later, is provided around the entire circumference.

FIG. 3 is a sectional view taken along the arrow E in FIG. 1 of an embodiment other than FIG. 2. Since the function of this figure is the same as that of FIG. 2, only the structural differences will be described.

The difference from FIG. 2 is that the adsorber is divided into two parts (at the central exhaust port), and a seal 22a is provided on the dividing surface to prevent untreated gas from passing through. The advantages of this method are that the adsorbers 11a and Ilb to be handled are small;
Workability is good because of the low dose. Adsorption 1Sll
Since a and llb are split types, the pressure on the split parts is weak, so a block 23a and a push bolt 24 are provided in the center of the suction device 11a.

This ensures a pooling effect in front of JLB.

In the figure, the adsorber 112 or llb is shown in a removed state.

FIG. 4 is a view taken along the Hoch arrow in FIG. 3.

In the figure, 30 is fixed to the floor with a rail, and is provided in the longitudinal direction of the filter casing 3, almost parallel to the casing 3. 31 is a moving device with wheels 33 and a rail A/
30 and is movable in the longitudinal direction of the casing 3;
32 is a seal groove provided in the stopper 21. In this figure, the vertical direction, which could not be explained above, will be explained. The upper side of the supply/exhaust port provided in the adsorber 11 is open to the position of the vertical stopper 21'. % has a lower position than before. This is because there is no need for a special adsorbent outlet at the bottom, and the height of the casing 3 is effectively used. In addition, the seal groove 32 is arranged on all sides (
Shows a state where the entire circumference is closed.

FIG. 5 is an enlarged view of the top portion of FIG. 31. 40 in the figure
is a 0" ring, which is supported so that it can be installed in the 32 seal groove, and one side is pushed by the suction device 11 to seal between the suction device 11 and the stopper 21.

FIG. 6 is an enlarged view of the top portion of FIG. 3, and is a detailed sectional view of a sealing method other than that shown in FIG. 5. In the figure, 41a is a magnet that is fixed to the adsorber 11 with an adhesive or the like to prevent gas from leaking from the adhesive surface, and 41b is a magnet that is attached to the stopper 21.
418 is fixed like a magnet, 42 is a magnetic fluid and 4
18. b The space is held by a magnet. This method has 41
Let either magnet a or b be the south pole, and the other be the north pole. In this way, when the adsorber 11 is pressed against the stopper 21, 41
2.41b Both magnets approach each other with a small gap. By injecting the magnetic fluid 42 into this gap, the left and right seals can be achieved. Generally, with a one-stage seal, the differential pressure between the left and right sides is 0.7.
Ky/crA increases the number of stages as necessary. This magnetic seal method is a method that can produce a sealing effect even if the gap between the magnets changes or the seal portion is bent.

FIG. 7 is a view taken along the Rollo arrow in FIG. 2.

In the figure, 45 is a moving trolley, which is attached to the moving device 31 and can move the casing in three directions by an arbitrary drive device (not shown). 4t38, 46b are rotatable with wheels and are attached to the moving trolley 45. 47 and 48 are attached to the movable trolley 45 with axle wheels, and run in a different position from the wheels 46a and 46b (in a direction perpendicular to the traveling direction of the movable trolley 45), and rotate at both ends of the movable trolley 45, respectively. installed as possible. Reference numeral 49 denotes an inclined rail, which is fixed to the casing 3 by welding or the like, and is located at the running position of the wheels 47. Reference numeral 50 is an inclined rail, which is fixed to the moving device by welding or the like and moves at the running position of the wheels 48. Reference numeral 51 moves by means of guide wheels. It is rotatably attached to the trolley 45.

52 is a guide wheel, and 53 is a stopper which is fixed to the moving device 31. Next, the functions will be explained. The moving cart 45 is placed on the moving device 31 at a position as shown by the solid line in the figure and set at a predetermined position.

Next, a door (explained in FIG. 2) provided on the side of the adsorption device 11 (not shown) in the casing 30 is removed. In this state, the movable cart 45 is inserted into the lower part of the casing 3 and the suction device 11 using an arbitrary drive device (hereinafter simply referred to as the drive device) not shown. The movable cart 45 is supported by wheels 46a and 46b until the wheels 47 ride on the guide surface of the casing 3. Even when the wheel 47 reaches the position 47', the guide wheel 51 does not come into contact with the lower surface of the adsorber 11, and the movable cart 45 moves further, and the wheel 47 moves further while being cylindered by the inclined rail 49 until it reaches the position 47''. On the way to this position 47'', the guide wheel 51 hits the lower part of the suction device 11, and as the movable cart 45 further advances on the inclined rail 49, it is displaced upward. Therefore, the adsorber 11 is at the position 11'.

Naturally, the wheel 48 is lifted by the inclined rail 50 at the position 48". At this time, the upper surface of the guide wheel 51" coincides with the upper surface of the guide wheel 52, while the upper surface of the adsorber 11' is between the casing 3 and the upper surface of the guide wheel 52. It has few gaps. Therefore,
The adsorber 11' can be removed using any extraction device (manual power is sufficient).
is moved to the second position while rolling on the guide wheels 51", 52. Overrun at this time is prevented by the stopper 52. Although not shown, a set of the same moving carts 45 is also provided on the moving device 31, and the moving device 31 is pulled out. The adsorber 11 is installed in the front or rear part of the adsorber 11, and the adsorber 11 is attached to the casing 3.
After extracting the adsorbent, the movable cart 45 used for extraction is retracted, the movable cart 31 is moved by the length of one adsorber 11, and the above reverse process is performed to immediately replace a new adsorber. Become. The adsorbent contained in the adsorbent 11 that has been taken out is replaced with a new one in another large space.

FIG. 8 is a view in the direction of the rule arrows in FIG. 3.

In the figure, a cover 60 is removably fixed to the adsorber casing 59 via bolts 61 (welded to the adsorber casing 59) and a sealing material 62. 6
3 is the adsorbent CH suction nozzle, 64a is a hose and nozzle 6
The hopper 65 and the suction device 66 are connected by a hose 64b. This figure shows the replacement of the adsorbent CH, and when the 60 cover is removed, the upper layer of the adsorbent CH comes out. Insert the nozzle 63 there and 66 the suction device (
When suctioned with a device such as a vacuum cleaner), the adsorbent CH passes through the hose 64a and the flow rate is reduced by the hopper 65.
The air remains in the hopper 65 due to its own weight, and only air flows into the hopper 64b.
The hose is passed through and collected by the suction device 66. This suction device 66 does not need to be special, it may be a vacuum cleaner installed in the room, or it may be specially provided.
Filling can also be done by input.

〔Effect of the invention〕

According to the present invention: 1. Maintenance time can be reduced by 20%, and radiation exposure can be reduced.

2. The amount of adsorbent can be reduced by 10%, which reduces costs and reduces the amount of waste because there is less contaminated adsorbent.

3.-7-Reliability of performance is doubled.

[Brief explanation of the drawing]

Figure 1 is a gas processing system diagram in a nuclear power plant, Figure 2 is a sectional view taken along the E arrow in Figure 1, Figure 3 is a sectional view taken in the E arrow direction of Figure 1 other than Figure 2, and Figure 4 is a sectional view taken along the E arrow in Figure 1. The figure is a Hoho arrow view of Fig. 3, Fig. 5 is an enlarged view of the G part of Fig. 3, Fig. 6 is an enlarged view of the G part of Fig. 3 other than Fig. 5, and Fig. 7 is an enlarged view of the G part of Fig. 3. 8 is a view in the direction of the rule arrow in FIG. 3. 3...Casing, 11...Adsorber, 14...Blower, 9.10.12...Filter, 21...Stopper, 22...Seal, CH...Adsorbent, 25
...Punching metal, 26a, 26b--Guide, 23...Block, 24...Push bolt, 27-
...Door, 31...Movement device, 32...Seal groove,
30...Rail, 40...0" ring, 41a, 4
1b...Magnet, 42...Magnetic fluid, 49.50...
・Slope rail, 47, 48° 46a, 46b...Wheel, 51.52...Guide wheel, 53...Stopper, 45...Moving trolley, 60...Cover, 59...
・Adsorber casing, 63... Nozzle, 64a, 64
b...Hose, 65-...Hopper, 66 Bud 8 Figure 64t)

Claims (1)

[Claims] 1. Dehumidifiers that remove water contained in gas using filters that remove radioactive gases in nuclear power plants; heater devices that increase the temperature of gas and adjust its humidity; and remove radioactive contaminants contained in gas. In the filter device, the gas inflow port is of a wide-pointed shape. 1. A filter device comprising an adsorber inside the guide, the opening of which and the gas inlet end having an arbitrary inclination angle to guide the flow of fluid.