JP4357494B2 - Bag filter device - Google Patents

Description

  The present invention relates to a bag filter device, and more particularly to a bag filter device capable of preventing corrosion of an injection pipe and an injection valve by preventing inflow of exhaust gas into a backwash injection pipe.

The bag filter device is used, for example, to remove dust with a filter cloth from an incinerator of a garbage incinerator.
In this bag filter device, a lower inlet side region connected to the gas inlet and an upper outlet side region connected to the gas outlet are partitioned by a bag-like filter cloth, and introduced from the gas inlet to the inlet side region. When the exhaust gas passes through the filter cloth, dust in the exhaust gas is collected by this filter cloth, and the dust-exhausted exhaust gas is discharged from the outlet side 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.

  However, in the bag filter device having the above-described injection pipe, when the compressed air is not injected, exhaust gas with high acidity that has passed through the filter cloth and is dusted flows into the injection pipe, and the incinerator Even during operation, there is a problem that the exhaust gas in the injection pipe is cooled and condensed to corrode the injection pipe and the injection valve.

In view of the problems of the conventional bag filter apparatus has for its object to provide a bag filter apparatus which can prevent corrosion of the injection pipe and the injection valve that due to the inflow of the exhaust gas.

In order to achieve the above object, the bag filter device of the present invention removes dust accumulated by filtering a filter cloth that collects dust by filtering exhaust gas and intermittently injecting compressed air from the downstream side to the filter cloth. In a bag filter device having an injection pipe to be dropped and an injection valve for intermittently supplying compressed air to the injection pipe, exhaust gas flowing from the injection opening into a section from the uppermost injection opening to the injection valve of the injection pipe It is characterized in that a valve-like body for preventing the above is provided.

  In this case, the valve-like body can be disposed in a temperature region where the exhaust gas is not condensed.

Moreover, the injection pipe connected to an injection port can be arrange | positioned in the surrounding wall of the casing which divides the upper exit side area | region connected with the gas outlet of a bag filter apparatus.

According to the bag filter device of the present invention, a filter cloth that collects dust by filtering exhaust gas, and an injection pipe that wipes off dust accumulated by intermittently injecting compressed air from the downstream side to the filter cloth , In a bag filter device including an injection valve that intermittently supplies compressed air to the injection pipe, a valve shape that blocks exhaust gas flowing from the injection port in a section from the uppermost injection port to the injection valve of the injection pipe Since the body is provided, when the compressed air is not being injected, the injection pipe can be blocked by the valve-like body to prevent the inflow of exhaust gas, thereby preventing the corrosion of the injection pipe and the injection valve. it can.

  In this case, by disposing the valve-like body in a temperature region where the exhaust gas does not condense, it is possible to prevent the exhaust gas from condensing even between the valve-like body and the injection port and to prevent corrosion.

  Embodiments of the bag filter device of the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment of the bag filter device of the present invention.
This bag filter device includes a filter cloth 1 that collects dust by filtering exhaust gas, and an injection pipe 2 that removes dust accumulated by intermittently injecting compressed air A onto the filter cloth 1 from the downstream side ; And an injection valve 22 for intermittently supplying compressed air to the injection pipe 2, and exhaust gas flowing from the injection openings 21 , 21 a in the section from the uppermost injection opening 21 a to the injection valve 22 of the injection pipe 2. A valve-like body 3 for blocking is provided.

  In the bag filter device, as shown in FIG. 1, a lower inlet side region 5 connected to the gas inlet 4 and an upper outlet side region 7 connected to the gas outlet 6 are partitioned by a bag-like filter cloth 1. When the exhaust gas introduced from the gas inlet 4 to the inlet side region 5 passes through the filter cloth 1, dust in the exhaust gas is collected by the filter cloth 1, and the dust-removed exhaust gas is discharged to the outlet side region 7. To the outside through the gas outlet 6.

The injection pipes 2 are installed opposite to the open ends of the respective bag-like filter cloths 1. The injection valves 22 connected to the injection pipes 2 are opened, and the injection ports 21 provided in the injection pipes 2 . The filter cloth 1 is back-washed by instantaneously injecting compressed air A from 21a every predetermined time, and the dust adhering to the filter cloth 1 is periodically wiped off to the screw conveyor 8 below. Yes.

Specifically, the aforementioned valve-like body 3 is, for example, a check valve 31 as shown in FIG. 3A or a split rubber-like partition member as shown in FIGS. 3B to 3E. 32 can be disposed in the middle of the injection pipe 2 by a flange wafer (FIG. 3D), a screw socket (FIG. 3B), a joint (FIG. 3E), or the like.
In the case of the check valve 31, when the compressed air A is injected, the valve 31a is opened by its air pressure, and at other times, the valve 31a returns to the original closed state due to the urging force of the spring or the weight of the valve.
In the case of a split rubber-like partition member 32, a rubber-like elastic film 32a made of silicon rubber or the like is provided with a cut-off 32b in a split shape, and when compressed air A is injected, it is opened by its air pressure. In other cases, the posture is restored to the original closed state by its own elasticity.
In addition to the above example, the valve-like body 3 uses an electromagnetic valve (not shown) that opens and closes when the injection valve 22 opens and closes, for example, an electromagnetic valve that opens at the timing of compressed air injection. You can also.

Further, since the exhaust gas corrodes the metal due to dew condensation, it is preferable that the valve-like body 3 for preventing the inflow of the exhaust gas is disposed in a high temperature range where the exhaust gas does not condense in consideration of its heat resistance temperature.
Specifically, in the section from the most upstream injection port 21 a to the injection valve 22, for example, it can be disposed near the outlet or the inlet of the casing 9.

Thus, the bag filter apparatus of the present embodiment wipes off dust accumulated by filtering the filter cloth 1 that collects dust by filtering exhaust gas and intermittently injecting compressed air A from the downstream side to the filter cloth 1. In the bag filter device provided with the injection pipe 2, the valve-like body 3 that blocks the exhaust gas flowing from the injection ports 21 , 21 a is provided upstream of the uppermost injection port 21 a of the injection pipe 2. When the air A is not being injected, the injection pipe 2 can be blocked by the valve-like body 3 to prevent the inflow of exhaust gas, thereby preventing the injection pipe 2 and the injection valve 22 from being corroded.
In this case, the valve-like body 3 is arranged in a temperature region where the exhaust gas is not condensed in consideration of the heat-resistant temperature, so that the condensation of the exhaust gas is prevented between the valve-like body 3 and the injection port 21 and the corrosion is prevented. Can be prevented.

  The bag filter device of the present invention has been described above based on a plurality of embodiments. However, the present invention is not limited to the configurations described in the above embodiments, and the configurations are appropriately set within the scope of the invention. Can be changed.

  Since the bag filter device of the present invention has a characteristic of preventing corrosion of the injection pipe and the injection valve by preventing the inflow of exhaust gas into the backwash injection pipe, for example, HCL, SOx, etc. It can use suitably for the use of the bag filter apparatus which removes dust which contains.

It is sectional drawing which shows one Example of the bag filter apparatus of this invention. It is sectional drawing which shows the principal part of the bag filter apparatus. The valve-like body of the bag filter device is shown, (a) is a cross-sectional view of the check valve, (b) is a cross-sectional view in which the partition member is disposed by a screw socket, (c) is a front view of the partition member, (d ) Is a cross-sectional view in which the partition member is disposed by a flange, and (e) is a cross-sectional view in which the partition member is disposed by a pipe joint. It is a section front view of the bag filter device. It is a cross-sectional side view of the bag filter apparatus.

Explanation of symbols

1 Filter cloth 2 Injection pipe 21 Injection port
21a Uppermost injection port of injection pipe 22 Injection valve 3 Valve body 31 Check valve 32 Partition member 4 Gas inlet 5 Inlet side area 6 Gas outlet 7 Outlet side area 8 Screw conveyor 9 Casing

Claims (3)

A filter cloth for collecting dust by filtering the exhaust gas, an injection pipe for removing dust accumulated by intermittently jetting compressed air from the downstream side to the filter cloth, and intermittently supplying compressed air to the injection pipe A bug filter device comprising an injection valve to be supplied, wherein a valve-like body for blocking exhaust gas flowing from an injection port is provided in a section from an uppermost injection port to an injection valve of an injection pipe. Filter device.   The bag filter device according to claim 1, wherein the valve-like body is disposed in a temperature region where the exhaust gas is not condensed. 3. The bag filter device according to claim 1, wherein an injection pipe connected to the injection port is disposed in a peripheral wall of a casing defining an upper outlet side region communicated with a gas outlet of the bag filter device. .

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