JP2015192955A - Dust removal device of cylindrical filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively remove dust adhered to the entire inner peripheral surface of a cylindrical filter with a simple configuration.SOLUTION: A dust removal device of a cylindrical filter comprises: a rectangular nozzle body 22 inserted to the inside of a cylindrical filter (14) to which dust is adhered, and in which two facing sides are arranged in a shaft direction of an inner peripheral surface of the cylindrical filter (14); a plurality of nozzle holes 24 formed on the two facing sides of the nozzle body 22; and an inner rotary nozzle 20 having a mechanism (a rotary bearing 26 and a rotary sleeve 28) for rotating the nozzle body 22 inside the cylindrical filter (14), and a mechanism (a jet blaster 32) for jetting gas for dust removal from the nozzle holes 24.

Description

  The present invention relates to a dust removing device for a cylindrical filter, and more particularly, a dust for a cylindrical filter suitable for use in removing a dust from a stainless steel filter for a high temperature of about 200 ° C. in a biomass gasification plant. The present invention relates to a removing device.

  Biomass gasification plants that incinerate wood contaminated with radioactive materials such as radioactive cesium and generate power with high efficiency while removing the radioactive materials are being studied. In addition, biomass gasification furnaces that heat and gasify non-contaminated wood such as trunks to high temperatures using hot gas generated using contaminated wood such as skins and branches in such biomass gasification plants have been studied. Yes. Furthermore, it can withstand a high temperature of about 200 ° C., suitable for use on the exit side of such a biomass gasification furnace, and captures radioactive materials, such as cesium-containing dust, contained in high-temperature exhaust gas. High temperature stainless steel filters have been developed.

  Since such a filter is clogged due to dust adhering to use, it is desirable to remove the dust and prevent clogging of the filter so that it can be used repeatedly without replacing the filter.

  As an apparatus for removing dust from a filter, for example, in Patent Document 1, a flat cross-shaped nozzle body is provided inside a cylindrical filter, and the outer peripheral portion of the nozzle body is connected to the inner peripheral surface of the cylindrical filter. In addition, it describes that dust is removed by moving the nozzle body up and down in a filter by a vertically moving mechanism provided separately while rotating the nozzle body by the reaction force of the compressed air injected obliquely and intermittently.

  Further, Patent Document 2 describes that dust on the upper surface of a stored product is removed by air jetted downward from a flat cross-shaped rotating nozzle.

JP 2001-259557 A Japanese Patent Laid-Open No. 11-130360

  However, in the technique described in Patent Document 1, since the rotary nozzle has a planar cross shape, it is necessary to separately provide an up-and-down moving mechanism to move up and down in the cylindrical filter, which makes the configuration complicated and expensive. In addition to this, it has a problem that it easily breaks down.

  In addition, the technique described in Patent Document 2 simply removes dust accumulated on the upper surface of a stored product, and cannot remove dust attached to the inner peripheral surface of the cylindrical filter.

  The present invention has been made to solve the conventional problems, and an object thereof is to enable effective removal of dust attached to the entire inner peripheral surface of a cylindrical filter with a simple configuration.

  The present invention includes a rectangular nozzle body that is inserted into the inside of a cylindrical filter to which dust is attached and whose two opposing sides are arranged along the axial direction of the inner peripheral surface of the cylindrical filter; A plurality of nozzle holes formed on the two opposite sides of the nozzle body, a mechanism for rotating the nozzle body inside the cylindrical filter, and for ejecting dust removing gas from the nozzle holes The problem is solved by a dust removing device for a cylindrical filter, characterized in that an inner rotating nozzle having a mechanism is provided.

  Here, the nozzle hole is formed obliquely with respect to the inner peripheral surface of the cylindrical filter, and the nozzle body can be rotated by a reaction of the ejection of the dust removing gas.

  The cylindrical filter may further include an outer annular nozzle for ejecting a dust removing gas along the outer peripheral surface of the cylindrical filter.

  Moreover, the ejection of gas for dust removal from the inner rotating nozzle and the ejection of gas for dust removal from the outer annular nozzle can be performed alternately.

  Further, the amount of dust removal gas ejected from the inner rotary nozzle can be made larger than the amount of dust removal gas ejected from the outer annular nozzle.

  Moreover, the relay knocker which gives an impact to the filter container in which the said cylindrical filter was accommodated can be further provided.

  Moreover, the impact by the relay knocker can be given to the filter container after the ejection of the dust removing gas.

  According to the present invention, dust attached to the entire inner peripheral surface of the cylindrical filter can be effectively removed with a simple configuration without moving the inner rotary nozzle in the axial direction of the cylindrical filter. Therefore, the cylindrical filter can be used repeatedly without being replaced, and the life of the cylindrical filter can be extended.

The partial longitudinal cross-sectional view seen from the front which shows the whole structure of embodiment of the filter unit which concerns on this invention Similarly, a partial longitudinal section viewed from the back The top view which shows the inner side rotation nozzle of the said embodiment Front view showing the lower nozzle The top view which similarly shows a downward jet nozzle The time chart which similarly shows the timing ((A) and (B)) which injects compressed air from an inner side rotation nozzle and a downward jet nozzle, and the operation timing (C) of an air knocker.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by the content described in the following embodiment and an Example. In addition, the constituent elements in the embodiments and examples described below include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in the so-called equivalent range. Furthermore, the constituent elements disclosed in the embodiments and examples described below may be appropriately combined or may be appropriately selected and used.

  In the following, a biomass gasification plant that incinerates wood contaminated with radioactive materials such as radioactive cesium and generates electricity with high efficiency while removing the radioactive materials, using hot gas generated using contaminated wood such as the skin and branches. Capturing radioactive material, for example, cesium-containing dust, contained in high-temperature exhaust gas, placed on the exit side of a biomass gasification furnace for heating and gasifying non-contaminated wood such as trunks FIG. 1 (partially longitudinal sectional view seen from the front) and FIG. 2 (partially longitudinal sectional view seen from the back) of the overall configuration of the embodiment of the present invention applied to a filter unit including a high temperature stainless steel filter for Show.

  Inside the filter container 12 of the filter unit 10, a cylindrical filter 14 for capturing dust containing cesium in high-temperature waste gas is provided with the axial direction as the vertical direction.

  Inside the cylindrical filter 14, a rectangular (rectangular in the figure) nozzle body 22 in which two opposing sides are arranged along the axial direction (vertical direction in the figure) of the inner peripheral surface of the cylindrical filter 14. A plurality of nozzle holes 24 formed on the two opposite sides of the nozzle body 22, a rotary bearing 26 for rotating the nozzle body 22 inside the cylindrical filter 14, a rotary sleeve 28, and For example, an inner rotary nozzle 20 having a jet blaster 32 for ejecting compressed air for dust removal (hereinafter simply referred to as air) from the nozzle hole 24 via a 40A pipe 30 is provided.

  The nozzle hole 24 of the inner rotary nozzle 20 is formed obliquely with respect to the inner peripheral surface of the cylindrical filter 14, and as shown in FIG. 3, for removing dust that is intermittently ejected from the nozzle hole 24, for example. The nozzle body 22 is rotated by, for example, 30 degrees by the reaction of air, so that dust adhering to the inner peripheral surface of the cylindrical filter 14 is uniformly wiped off.

  Further, as shown in detail in FIG. 4 (front view) and FIG. 5 (plan view), dust removal air is ejected downward along the outer peripheral surface of the cylindrical filter 14 along the outer peripheral surface thereof. A downward jet nozzle 40 as an outer annular nozzle is provided. The lower ejection nozzle 40 includes an annular nozzle body 42 having a diameter larger than that of the cylindrical filter 14, a nozzle hole 44 formed substantially uniformly downward along the entire circumference of the annular nozzle body 42, for example, A jet blaster 48 for ejecting air for dust removal from the nozzle hole 44 through a pipe 46 of 25A. The dust adhering to the outer peripheral surface of the cylindrical filter 14 is wiped off by the air jetted downward from the lower ejection nozzle 40 along the outer peripheral surface of the cylindrical filter 14.

  The ratio of the ejection amount of dust removal air ejected from the inner rotary nozzle 20 and the ejection amount of dust removal air ejected from the lower ejection nozzle 40 can be, for example, 10 to 3.

  Further, the air injection from the inner rotary nozzle 20 and the air injection from the lower jet nozzle 40 occur alternately as shown in FIG. 6 so as not to interfere with the actions of both. .

  The dust that could not be removed by the air is manually brushed while inserting a hand from an insertion port 52 of a glove box 50 provided on the side surface of the filter container 12 (see FIG. 2) and looking through the observation window 54, for example. Or blown off with air.

  Further, an air-type relay knocker (referred to as an air knocker) 60 is further provided below the side surface of the filter container 12 so as to give an impact to the filter container 12 by, for example, a piston operated by air. Thereby, the dust adhering to the filter container 12 is collected in the lower dust bag 16 by impact. The collected dust (dust) can be exchanged without touching the outside air with a sealed exchange type dust bag (not shown).

  In the figure, 70 is a carriage, 72 is a caster for moving the carriage 70, and 74 is a pedestal ring for fixing the filter container 12 to the carriage 70.

  In the present embodiment, since the inner rotary nozzle 20, the lower ejection nozzle 40 and the air knocker 60 are used in combination, the dust attached to the cylindrical filter 14 can be effectively collected in the dust collection bag 16. For example, the lower ejection nozzle 40 and the air knocker 60 can be omitted.

  Moreover, in the said embodiment, although the cylindrical filter was made into cylindrical shape and the arrangement direction was made into the up-down direction, the shape and arrangement direction of a cylindrical filter are not limited to this. In addition, the outer annular nozzle is a lower ejection nozzle having an annular nozzle body disposed at the upper end of the cylindrical filter, but the shape of the outer annular nozzle is not limited to the annular shape, and the position of the outer annular nozzle is also provided. The upper end of the cylindrical filter is not limited. Further, the dust removing fluid is not limited to air, and the supply source thereof is not limited to a jet blaster. Further, the relay knocker is not limited to the air knocker.

  In addition, in the said embodiment, although this invention was applied to the filter unit 10 of the exit side of a biomass gasification furnace, the application object of this invention is not limited to this.

DESCRIPTION OF SYMBOLS 10 ... Filter unit 12 ... Filter container 14 ... Cylindrical filter 16 ... Dust collection bag 20 ... Inner rotation nozzle 22, 42 ... Nozzle body 24, 44 ... Nozzle hole 26 ... Rotary bearing 28 ... Rotary sleeve 32, 48 ... Jet blaster 40 ... Downward jet nozzle 60 ... Air knocker

The present invention, dust is inserted inside the cylindrical filter attached, two opposing sides are rectangular type like Nozurubode I arranged along the axial direction of the inner peripheral surface of the cylindrical filter, the nozzle the two opposing sides formed in a plurality of nozzle holes of the body, the machine structure for rotating the nozzle body inside the tubular filter, and, for ejecting a gas for dust removal from the nozzle hole have a machine configuration, the nozzle hole is formed obliquely with respect to the inner peripheral surface of the cylindrical filter, the nozzle body is intermittently rotated by the reaction of intermittent jetting of the gas for the dedusting The inner rotary nozzle, and the inner rotary nozzle disposed at one end of the cylindrical filter by intermittently ejecting dust removing gas along the outer peripheral surface of the cylindrical filter. By An outer annular nozzle for removing dust discharged outside the cylindrical filter, and a dust removing gas jet from the inner rotating nozzle and a dust removing gas from the outer annular nozzle This problem is solved by a dust removing device for a cylindrical filter characterized by alternately ejecting water.

Here, the ejection amount of the dust removing gas ejected from the inner rotating nozzle can be made larger than the ejection amount of the dust removing gas ejected from the outer annular nozzle.

According to the present invention, dust attached to the entire inner peripheral surface of the cylindrical filter can be effectively removed without moving the inner rotary nozzle and the outer annular nozzle in the axial direction of the cylindrical filter with a simple configuration. it can. Therefore, the cylindrical filter can be used repeatedly without being replaced, and the life of the cylindrical filter can be extended.

Nozzle hole 24 of the inner rotary nozzle 20 is formed obliquely with respect to the inner peripheral surface of the cylindrical filter 14, as shown in FIG. 3, for dedusting ejected between missing to the nozzle hole 24 or al The nozzle body 22 is rotated by, for example, 30 degrees by the reaction of the air, so that the dust adhering to the inner peripheral surface of the cylindrical filter 14 is uniformly removed.

Claims (7)

A rectangular nozzle body that is inserted inside the cylindrical filter to which dust is attached, and whose two opposing sides are arranged along the axial direction of the inner peripheral surface of the cylindrical filter;
A plurality of nozzle holes formed on the two opposite sides of the nozzle body;
A mechanism for rotating the nozzle body inside the cylindrical filter;
A mechanism for ejecting dust removing gas from the nozzle hole;
A dust removing device for a cylindrical filter, comprising an inner rotating nozzle having   The nozzle hole is formed obliquely with respect to the inner peripheral surface of the cylindrical filter, and the nozzle body is rotated by a reaction of jetting of the dust removing gas. Item 2. A dust removing device for a cylindrical filter according to Item 1.   The dust removal of the cylindrical filter according to claim 1 or 2, further comprising an outer annular nozzle for ejecting a gas for dust removal along the outer circumferential surface of the cylindrical filter. apparatus.   The dust removal device for a cylindrical filter according to claim 3, wherein the ejection of gas for dust removal from the inner rotating nozzle and the ejection of gas for dust removal from the outer annular nozzle are alternately performed. .   The ejection amount of the dust removing gas ejected from the inner rotating nozzle is made larger than the ejection amount of the dust removing gas ejected from the outer annular nozzle. A dust removing device for a cylindrical filter as described in 1.   The dust removing device for a cylindrical filter according to any one of claims 1 to 5, further comprising a relay knocker that applies an impact to a filter container in which the cylindrical filter is accommodated.   7. The dust removing device for a cylindrical filter according to claim 6, wherein an impact caused by the relay knocker is applied to the filter container after the ejection of the dust removing gas is finished.

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