JPH0252525B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dust separation device with an automatic backwashing mechanism that is effective in avoiding troubles associated with transportation of highly concentrated dust, and a backwashing nozzle used therein.

For example, when treating vent gas containing dust, such as that generated from equipment that handles radioactive powder, conventional methods were used to introduce it into a bag filter and over-process it, but the flow rate of the vent gas was low and the dust concentration If the temperature was high, dust would accumulate inside the vent pipe, causing blockage problems.

Separation techniques in this case include, for example, the use of sintered metal filters (compression-molded and sintered metal fibers with pores inside), but they are clogged with fine dust. Even if backwashing was performed, the overpressure loss gradually increased, and an effective backwashing effect could not be achieved.

There are also systems that use a penetrating dust collection system such as a collision plate or a cyclone separator, but they have the disadvantage that they cannot be expected to have an effective dust removal effect when the vent gas flow rate is low.

This invention is intended to solve the above-mentioned situation, and a backwash nozzle consisting of a blowout nozzle and a double ventilator nozzle is provided on the base end side of the metal filter to respond to the differential pressure between the raw gas section and the supergas section. The present invention provides a dust separator with an automatic backwashing mechanism and a backwashing nozzle used therein, which has a configuration in which backwashing is performed from the inside and outside of the metal filter. This is what we are trying to provide.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes the case body of this device, which includes a cylindrical portion 2, a conical hopper portion 3, and a flange cover 4 that covers the upper end opening.
It is composed of. The case body 1 is separated into a raw gas section 6 and a supergas section 7 by a horizontally provided partition plate 5, each of which is provided with an inlet nozzle 8 and an outlet nozzle 9. The inlet nozzle 8 is for supplying vent gas containing dust through this part, and the outlet nozzle 9 is for discharging relatively clean gas that has passed through the dust. In FIGS. 1 and 2, the inlet nozzle 8 and the outlet nozzle 9 are not necessarily shown in the corresponding exact positions, but this is for the sake of understanding, and they are not shown in the appropriate positions of the case body 1. formed in position.

2 supported by and passing through the partition plate 5.
Backwash nozzles 10 are provided. As shown in the enlarged view of FIG. 3, the backwash nozzle 10 consists of a jet nozzle 11 and a double ventilate nozzle 12 formed separately from the jet nozzle 11.
The ventilate nozzle 12 has a center hole 12a and an outer hole 12b surrounding the center hole 12a, and the base end of the metal filter 13, which has a cylindrical shape with a bottom, is connected to the center base 12.
It is integrally attached to the lower end of c. Therefore, the metal filter 13 is supported by the partition plate 5 via the backwash nozzle 10. In this embodiment, the metal filter 13 is made of laminated sintered metal.

Spout nozzle 11 and ventilate nozzle 12
The outer circumferential hole 12b is communicated with a supply pipe 14 for backwashing gas, and this supply pipe 14 is provided through the case body 1 as shown in FIGS. 1 and 2,
Furthermore, automatic opening/closing valve 1 to control backwash gas
5 is provided.

A separation plate 16 is provided between the two metal filters 13 to avoid mutual influence, and a conical collision plate 17 is provided at the lower end of the separation plate 16 in correspondence with the metal filters 13. There is. The space around the two metal filters 13 can be created by providing the inlet nozzle 8 at the end of the separation plate 16 or by forming a notch in a part of the separation plate 16. Measures are being taken to communicate.

In addition, in order to measure the differential pressure between the raw gas section 6 and the supergas section 7, a pressure detection nozzle 1 is installed in each section.
8a and 18b are provided, and these nozzles 18
a and 18b are connected to a differential pressure detection mechanism (not shown).

In FIG. 1, reference numeral 19 indicates a collision plate provided near the inlet nozzle 8, and reference numeral 20 indicates a dust extraction nozzle.

Next, the operation of this separation device will be explained. When vent gas containing dust is introduced from the inlet nozzle 8,
This gas first hits the collision plate 19 and after some dust is separated, it becomes the raw gas part 6 of the case body 1.
supplied within. This gas is then overtreated while passing through the metal filter 13, enters the overgas section 7 through the center hole 12a of the ventilator nozzle 12, and is then sucked in by a blower or the like and sent out from the outlet nozzle 9. Ru.

If the overtreatment continues, the collected dust will adhere to the surface of the metal filter 13, and the overresistance of the metal filter 13 will increase. This increase in excessive resistance is detected as a pressure difference between the raw gas section 6 and the excessive gas section 7 by the differential pressure detection mechanism through the pressure detection nozzles 18a and 18b, and when the value exceeds the reference value, the automatic on-off valve 15 is activated. It is opened and so-called backwashing is performed.

That is, when the automatic opening/closing valve 15 opens, backwashing gas is introduced through the backwashing gas supply pipe 14,
It is ejected from the ejection nozzle 11 toward the center hole 12a of the ventilate nozzle 12. At this time, secondary gas is sucked in from the periphery by the action of the air ejector, and a large amount of gas is supplied to the center hole 12a.
This gas flows through the center hole 12 of the ventilate nozzle 12.
While passing through a, the pressure is increased by the action of the ventilate tube, and the air is ejected into the metal filter 13 as an air jet, which serves to blow away the collected dust. The backwashing gas is also ejected as an air jet to the outer surface of the metal filter 13 through the outer hole 12b, so that the collected dust is exposed to the metal filter 1.
Air jets are blown from the inside and outside of 3 for effective removal. By spraying from inside and outside, it is possible to sufficiently remove things that are difficult to remove from only one side.

This backwashing operation is performed sequentially on the two metal filters 13 at different times, and while one metal filter 13 is being backwashed, the other metal filter 13 is overtreated. Therefore, over-processing can be performed continuously without taking a break.

In this case, since the separation plate 16 is provided between the two metal filters 13, it is possible to suppress mutual adverse effects such as the dust that has been brushed off re-adhering to the other metal filter 13.

This dust separator uses a backwashing nozzle 10 equipped with a double-pipe ventilary nozzle 12, and also uses a differential pressure detection mechanism to accurately and quickly detect the adhesion state of collected dust. The feature is that dust is efficiently blown away by blowing an air jet from inside and outside of the filter 13.

Furthermore, since this backwashing operation is performed instantaneously with a small amount of backwashing air, the absolute amount of backwashing air blown into the case body is small, and there is a risk that the negative pressure inside the case body will be converted to positive pressure. There is no.

Furthermore, in the case of an embodiment in which a metal filter made of laminated sintered metal is used, the surface filtration occurs on the outer surface of the filter, so that clogging is reduced and the backwashing effect can be further enhanced. Another great feature is that when a plurality of metal filters are used, continuous operation is possible by backwashing them sequentially at different times and continuing the process.

FIG. 4 shows another configuration of the backwashing nozzle 10 used in the present invention. In contrast to FIG. 3, where the jet nozzle 11 and ventilary nozzle 12 are provided separately, they are configured in one piece. It is robust and compact.

Furthermore, in the one shown in FIG. 5, the metal filter 13 is constructed not in a cylindrical shape but in a pad shape. Correspondingly, the construction of the jet nozzle 11 and the ventilate nozzle 12 is also made into a flat rectangular tube shape. A plurality of pipes 21 are arranged on both sides as a mechanism for ejecting backwashing gas onto the outer surface of the metal filter 13, and a small ejection hole 22 is formed in each of these pipes 21.

Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without changing the gist.

Although the above embodiment shows the case where two metal filters are used, this invention includes the case where only one metal filter is used, and furthermore, in order to increase the dust separation ability, three metal filters are used.
An appropriate number greater than or equal to 1 can be selected. In this case, all the metal filters may be given different backwashing times, but they can also be divided into a plurality of blocks and the backwashing time given to each block can be made different.

Furthermore, in the above embodiments, a laminated sintered metal filter was used as the metal filter, but this can also be constructed with other metal filters such as those made of a single metal film. can.

Furthermore, although a cylindrical case body is shown as the case body in the above embodiment, a square cylinder or other shaped case body may be used instead.

As described above, according to the present invention, a backwash nozzle consisting of a jet nozzle and a double ventilate nozzle is provided on the proximal end side of the metal filter, and the metal filter is To provide a dust separation device with an automatic backwashing mechanism capable of accurately and efficiently separating dust with a large dust removal effect by backwashing from within, and a backwashing nozzle used therein. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of one embodiment of the present invention;
The figure is a cross-sectional view taken along the line -' in Figure 1 in the direction of the arrow, Figure 3 is an enlarged longitudinal cross-sectional view of the backwashing nozzle used in the same embodiment, and Figure 4 is the backwashing nozzle used in this invention. FIG. 5 is an enlarged vertical cross-sectional view showing different configurations of the backwashing nozzle used in the present invention and a partially cutaway perspective view of a further different configuration of the backwashing nozzle and the metal filter that follows it. DESCRIPTION OF SYMBOLS 1... Case body, 2... Cylindrical part, 3... Hopper part, 4... Flange cover, 5... Partition plate, 6... Raw gas part, 7... Hypergas part, 8...
Inlet nozzle, 9...Outlet nozzle, 10...Backwash nozzle, 11...Blowout nozzle, 12...Venture nozzle, 13...Metal filter, 14...Backwash gas supply pipe, 15...Automatic Open/close valve, 16...
Separation plate, 17... Collision plate, 18a, 18b... Pressure detection nozzle, 19... Collision plate, 20... Dust extraction nozzle, 21... Pipe, 22... Small hole for ejection.

Claims (1)

[Claims] 1. A case body having a cylindrical shape and having a hopper at the bottom, a partition plate that divides the main body into a raw gas section and a supergas section, and a raw gas containing dust supported by the partition plate. This backwashing nozzle has a metal filter for separating dust from the air, a backwashing nozzle consisting of a jet nozzle and a double ventilate nozzle installed on the proximal end of the metal filter, and an automatic opening/closing valve. a gas supply pipe for supplying backwashing gas to the gas section, and a differential pressure detection mechanism for detecting the differential pressure between the raw gas section and the overgas section, and the automatic opening/closing valve is controlled by the output of the differential pressure detection mechanism. A dust separator with an automatic backwashing mechanism, characterized in that the metal filter is controlled from the inside and outside and backwashed. 2. The dust separator with an automatic backwash mechanism according to claim 1, wherein the metal filter is made of laminated sintered metal. 3. Claim 1, wherein the metal filter is composed of a single metal film.
Dust separator with automatic backwashing mechanism as described in . 4. The automatic backwashing mechanism according to any one of claims 1 to 3, characterized in that it comprises a plurality of the metal filters and a separation plate is provided between these filters. Dust separation equipment. 5 Divide the plurality of metal filters into a plurality of parts,
5. The dust separator with an automatic backwash mechanism according to claim 4, wherein the backwash gas is sequentially supplied to each of these sections at different times. 6 Equipped with an ejection nozzle for backwash gas and a double ventilate nozzle having a center hole and an outer hole arranged opposite to this nozzle, and a metal filter is attached to the lower end of the central base of this ventilly nozzle. A backwashing nozzle, characterized in that a base end portion of the metal filter is integrally attached to the metal filter, and backwashing gas is ejected from the inside and outside of the metal filter through the center hole and the outer hole. 7. The backwash nozzle according to claim 6, wherein the jet nozzle and the ventilary nozzle are each tubular and integrally formed. 8. The jet nozzle and the ventilate nozzle each have a flat rectangular tube shape, and the outer holes of the ventilate nozzle are formed as a plurality of small holes in an elongated pipe disposed on both sides of the central base. A backwash nozzle according to claim 6, characterized in that: