JP2007209840A - Bag filter apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag filter apparatus capable of extending the life of filter cloth or a main body by dispersing the flow of an exhaust gas regardless of the condition such as a flow rate or temperature of the exhaust gas not only to eliminate the concentration place of the exhaust gas but also to reduce the stagnation time of the exhaust gas. <P>SOLUTION: In the bag filter apparatus constituted so that the lower region 5 communicating with a gas inlet 4 and the upper region 7 communicating with a gas outlet 6 are partitioned by the bag-shaped filter cloth 1 and the dust in the exhaust gas introduced into the lower region 5 is collected by the filter cloth 1 while the exhaust gas from which dust is removed is discharged to the outside from the gas outlet 6, a movable louver device 3 composed of a gas deflecting plate 31 and a gas deflecting plate driving mechanism for always driving the gas deflecting plate 31 to change its direction is provided to the gas introducing part of the lower region 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bag filter device, and in particular, in any conditions of exhaust gas flow rate, temperature, etc., disperses exhaust gas air flow, eliminates concentrated points, reduces exhaust gas residence time, and improves filter cloth and body life. The present invention relates to a bug filter device capable of extending the life.

Bag filter devices are used, for example, to remove dust from a waste incinerator or the like with a filter cloth.
In this bag filter device, a lower region communicating with a gas inlet and an upper region communicating with a gas outlet are partitioned by a bag-like filter cloth, and exhaust gas introduced from the gas inlet to the lower region passes through the filter cloth. The filter cloth collects dust in the exhaust gas, and discharges the dust-removed exhaust gas from the upper region to the outside through the gas outlet.

  In addition, such a bag filter device includes an injection pipe installed opposite to the open end of each bag-like filter cloth, and opens an injection valve connected to the injection pipe. The filter cloth is back-washed by instantaneously injecting compressed air from a provided injection port every predetermined time, and dust adhering to and accumulating on the filter cloth is periodically removed.

By the way, in such a bag filter device, if there is a drift in the exhaust gas inside, there is a risk of troubles such as damage to the filter cloth or wear of the main body due to dust. Or a fixed rectifying plate is installed by fluid analysis (see, for example, Patent Document 1).
However, depending on conditions such as the air volume and temperature of the exhaust gas to be introduced, the effect of the rectifying plate also changes, so the exhaust gas air flow may concentrate in part, and the filter cloth and the main body are worn out. There was a problem.
JP-A 64-11619

  In view of the problems of the above-described conventional bag filter device, the present invention disperses the exhaust gas flow to eliminate concentrated points regardless of conditions such as the air volume and temperature of the exhaust gas, and reduces the residence time of the exhaust gas to reduce the filtration time. An object of the present invention is to provide a bag filter device capable of extending the life of a cloth or a main body.

  In order to achieve the above object, the bag filter device of the present invention partitions the lower region communicating with the gas inlet and the upper region communicating with the gas outlet with a bag-like filter cloth, and removes dust in the exhaust gas introduced into the lower region. In a bag filter device that collects dust with a filter cloth and discharges the exhausted gas from the gas outlet to the outside, a wind direction plate and a wind direction plate drive mechanism that drives and changes the direction of the wind direction plate at the gas introduction part in the lower region A movable louver device is provided.

  In this case, the movable louver device can be configured to change the driving speed of the wind direction plate according to the air volume condition of the exhaust gas to be introduced.

  According to the bag filter device of the present invention, the lower region communicating with the gas inlet and the upper region communicating with the gas outlet are partitioned by the bag-like filter cloth, and dust in the exhaust gas introduced into the lower region is collected by the filter cloth. In addition, in the bag filter device that discharges the exhausted dust from the gas outlet to the outside, a movable type consisting of a wind direction plate and a wind direction plate drive mechanism that drives the wind direction plate and changes its direction in the gas introduction part in the lower region Since the louver device is provided, even if conditions such as the air volume and temperature of the exhaust gas to be introduced change, the wind direction plate of the movable louver device can always be driven and dispersed while fluctuating the air flow of the exhaust gas. In addition to eliminating the concentration point of the exhaust gas flow, it is possible to extend the life of the filter cloth and the main body by reducing the residence time of the exhaust gas.

  In addition, by configuring the movable louver device to change the driving speed of the wind direction plate according to the flow rate condition of the exhaust gas to be introduced, the driving speed of the wind direction plate can be increased even when the air volume of the exhaust gas is extremely increased. Thus, the exhaust gas flow can be dispersed while being varied according to the increased air volume, and local concentration of the exhaust gas can be prevented.

  Embodiments of the bag filter device of the present invention will be described below based on the drawings.

1 to 2 show an embodiment of the bag filter device of the present invention.
In this bag filter device, a lower region 5 communicating with a gas inlet 4 and an upper region 7 communicating with a gas outlet 6 are partitioned by a bag-like filter cloth 1, and dust in the exhaust gas introduced into the lower region 5 is filtered by the filter cloth 1. In addition, the exhaust gas that has been dust removed is discharged from the gas outlet 6 to the outside.
In this bag filter device, a movable louver device 3 including a wind direction plate 31 and a wind direction plate drive mechanism that constantly drives the wind direction plate 31 and changes its direction is provided in the gas introduction portion of the lower region 5.

  The bag filter device includes an injection pipe 2 installed opposite to the open end of each bag-like filter cloth 1, and an injection valve 21 connected to the injection pipe is opened to be provided in the injection pipe. The filter cloth 1 is back-washed by instantaneously injecting compressed air from the injection port every predetermined time, and the dust adhering to the filter cloth 1 is periodically wiped off to the screw conveyor 8 below. Yes.

As shown in FIGS. 2A and 2B, the movable louver device 3 includes, for example, a cylindrical body 32 provided in a part of a pipeline of the gas introduction section, and a shaft parallel to the inside of the cylindrical body 32. A plurality of supported wind direction plates 31 and a drive mechanism (not shown) such as a motor that constantly drives and changes the direction of these wind direction plates 31 are provided.
Further, as shown in FIGS. 2C and 2D, the movable louver device 3 is configured by, for example, a part of a pipe line of the gas introduction portion including a rotatable cylinder 32 and the cylinder 32. It is also possible to fix a plurality of wind direction plates 31 inside and to rotate the cylindrical body 32 to drive the wind direction plate 31 and change its direction.
Further, these movable louver devices 3 can also be controlled so as to measure the air volume condition of the exhaust gas to be introduced and change the driving speed of the wind direction plate 31 according to the measured value.
Thereby, for example, even when the air volume of the exhaust gas is extremely increased, by increasing the driving speed of the wind direction plate 31, the exhaust gas air flow can be dispersed while fluctuating according to the increased air volume. Concentration can be prevented, and the residence time of the exhaust gas at the location where it hits locally can be reduced.

FIGS. 3 to 4 show the wind speed distribution of the exhaust gas in Example A in which the movable louver device is provided as in this embodiment and in Example B in which the movable louver device is not provided.
In Example A in which the movable louver device 3 is provided as in the present embodiment, the airflow always fluctuates due to the driven wind direction plate 31, and therefore the portion where the wind speed of exhaust gas is strong moves with time and is dispersed in the filter cloth 1 and the main body. Can be guessed.
On the other hand, in Example B in which a movable louver device is not provided as in the prior art, the part where the wind speed of exhaust gas is strong does not move from the state shown in the figure, so the exhaust gas flow is concentrated on a part, The filter cloth and the main body are easily worn out.

Thus, in the bag filter device of this embodiment, the lower region 5 communicating with the gas inlet 4 and the upper region 7 communicating with the gas outlet 6 are partitioned by the bag-like filter cloth 1 and the exhaust gas introduced into the lower region 5 In the bag filter device that collects dust with the filter cloth 1 and discharges the exhausted dust to the outside from the gas outlet 6, the wind direction plate 31 and the wind direction plate 31 are driven to the gas introduction part of the lower region 5. Since the movable louver device 3 including the wind direction plate driving mechanism for changing the direction is provided, the wind direction plate 31 of the movable louver device 3 is always driven even if conditions such as the air volume and temperature of the exhaust gas to be introduced are changed. The exhaust gas flow can be dispersed while fluctuating, thereby eliminating the concentration of exhaust gas flow and reducing the residence time of the exhaust gas, thereby extending the life of the filter cloth 1 and the main body. Kill.
Further, by configuring the driving speed of the wind direction plate 31 to be changed depending on the air volume condition of the exhaust gas to be introduced, even if the air volume of the exhaust gas is extremely increased, the exhaust gas flow is reduced by increasing the driving speed of the wind direction plate 31. It is possible to disperse while fluctuating according to the increased air volume, and to prevent local concentration of exhaust gas.

  The bag filter device of the present invention has been described above based on the embodiments thereof. However, the present invention is not limited to the configurations described in the above embodiments, and the configuration is appropriately changed without departing from the spirit of the present invention. can do.

  The bag filter device of the present invention extends the life of the filter cloth and the main body by dispersing the exhaust gas flow to eliminate concentrated points and reducing the residence time of the exhaust gas under any conditions such as the volume and temperature of the exhaust gas. Since it has the characteristic that it can be used, it can be used suitably for the use of bag filter apparatuses, such as a garbage incinerator where conditions, such as an air volume and temperature of waste gas, change, for example.

It is sectional drawing which shows one Example of the bag filter apparatus of this invention. 1 shows a movable louver device of the bag filter device, wherein (a) a front view of the first embodiment, (b) is a plan sectional view of the same, (c) a front view of the second embodiment, and (d) is the same. FIG. It is plane sectional drawing which shows the wind speed distribution of the waste gas in the example (lower part) which provided the movable louver apparatus, and the example (upper part) which does not provide.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filter cloth 2 Injection pipe 21 Injection valve 3 Movable louver apparatus 31 Airflow direction plate 32 Cylindrical body 4 Gas inlet 5 Lower area | region 6 Gas outlet 7 Upper area | region 8 Screw conveyor 9 Casing

Claims (2)

  The lower region that communicates with the gas inlet and the upper region that communicates with the gas outlet are separated by a bag-like filter cloth, and dust in the exhaust gas introduced into the lower region is collected by the filter cloth, and the dust exhaust gas is removed from the gas outlet. In the bag filter device that discharges to the outside, a movable louver device including a wind direction plate and a wind direction plate driving mechanism that drives the wind direction plate and changes its direction is provided in a gas introduction portion in a lower region. Bug filter device.   The bag filter device according to claim 1, wherein the movable louver device is configured to change a driving speed of the wind direction plate according to a flow rate condition of exhaust gas to be introduced.

Images