JPH0623217A - Method and device for discharging collected dust of dry dust collector - Google Patents

Abstract

PURPOSE:To simplify equipment and to decrease the reflying of collected dust by installing a dust discharge means in the lower part of a dust collector through a cutoff valve, arranging a portable closed dust storage/transfer means that is attachable to and detachable from the dust discharge means and connecting the dust discharge means and the inlet side part of the dust collector by a pressure equalizing piping. CONSTITUTION:A dust collector body 1 and a discharge hopper 4 are connected by a pressure equalizing piping 7 having a stop valve 6 When the dust collected and deposited in a lower hopper 2 of a dust collector body 1 is discharged, first the stop valve 6 is opened to equalize the pressure in the dust collector body 1 with that in a tank lorry 5. Next, swing valves 3 incorporated into upper and lower discharge hoppers 4 are opened to discharge the collected dust collected and deposited in the lower hopper 2 into the tank lorry 5. As a result, the collected dust is discharged, completely sealed from outside the system and since the equalization is made, reflying dust contg. gas flows to the inlet side of the dust collector through the pressure equalizing piping. Therefore, the lowering of dust collecting performance due to reflying of dust is not caused.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for discharging dust collected from a dust collector such as an electric dust collector having a negative pressure inside.

[0002]

2. Description of the Related Art Regarding the method and equipment for discharging dust from a dust collector in which the inside of the dust collector has a negative pressure, it has been conventionally attempted to prevent the intake of air when the dust is discharged. Generally, equipment for transporting dust collected by a dust collector
Storage facilities include conveyors and dust storage bins.
A drive device for driving a chain or the like installed inside is attached to the casing of the conveyor so as to penetrate the casing. A gap is provided between the drive unit and the penetrating portion of the casing. In addition, the transfer section from the conveyor to the conveyor, the transfer section between the conveyor and the dust bin, the confirmation of the transported object,
An opening is usually provided for ease of maintenance when closed.

At the time of discharging dust collecting dust from the dust collector in which the inside of the dust collector has a negative pressure, air is sucked into the dust collector through the gaps of the discharged dust conveying equipment and the like, so that the dust collecting dust re-scatters. As a result, the dust collection performance is deteriorated, and the dust collector is corroded (for example, sulfuric acid corrosion) due to dew condensation due to a decrease in gas temperature of the suction portion inside the dust collector. In addition, if the above-mentioned penetrating portion of the conveyor casing and the opening portion of the conveyor connecting portion are hermetically closed, not only is the facility cost increased, but the maintainability deteriorates, which is not preferable.

FIG. 2 shows an outline of a dust collecting and discharging facility which has been conventionally applied to a dust collector for collecting exhaust gas from a sinter ore manufacturing facility which is an iron making facility. The internal pressure of the dust collector is a high negative pressure of about 1500 mm, and therefore has the following structure. That is, a small hopper 12 or a pipe is provided below the dust collector 1 between the upper valve 10, the lower valve 11, and the upper and lower valves, and the upper valve 10 is opened when the dust collecting dust is discharged. The upper valve 10 is closed, the lower valve 11 is opened, and the lower valve 11 is closed. The dust trapped in the lower part of the dust collector 1 is intermittently discharged while preventing the discharge of dust collecting gas and the suction of atmospheric gas. To be discharged. This is processed by the dust collecting dust conveying equipment such as the subsequent conveyor 9, the collecting conveyor 13 and the vertical conveyor 17 and the dust storing bin 14.

[0005]

However, the above-mentioned conventional techniques have the following problems. That is, in order to stably discharge the dust collecting dust intermittently discharged from the lower part of the dust collector to the outside of the system, it is necessary to have a dust carrying facility such as the above conveyor, a dust storage bin, etc. When the dust collector becomes large, several conveyors,
It becomes a large storage bottle, etc., and the equipment cost becomes expensive. Further, since the transfer facility is worn or clogged by dust, maintenance is laborious.

[0006]

Means for Solving the Problems The present invention is to solve the above-mentioned problems, and is a portable dust-collecting dust collecting device which is connected to a dust collecting dust discharging means connected to a lower part of the dust collecting device through a shutoff valve when the dust collecting device is in operation. With the storage / transportation means connected and the shutoff valve closed, the dust-containing gas inlet side of the dust collector and the dust collection dust discharge means or the portable closed dust collection dust storage / transportation means are pressure-equalized, and thereafter The method is a method for discharging dust collecting dust of a dry dust collector, wherein the shutoff valve is opened to cut out dust collecting dust.

Further, a dust collecting dust discharging means connected to the lower portion of the dust collector via a shutoff valve, a removable and portable portable dust collecting dust storing / conveying means, and the dust collecting dust discharging means or the portable dust collecting dust discharging means. A dust collecting dust discharging device for a dry dust collecting machine, comprising: a closed type dust collecting and storing means and a pressure equalizing pipe connecting a dust-containing gas-containing side of the dust collecting machine through an opening / closing valve.

[0008]

[Operation] After connecting the lower part of the dust collecting dust discharging means connected to the lower part of the dust collector through the shutoff valve and the portable closed type dust collecting dust storing / conveying means, the dust collecting dust discharging means or the portable closed type collecting device Dust storage / transport means and the inside of the dust collector are pressure-equalized. After that, the shutoff valve is opened to discharge the collected dust. Therefore, dust is collected and discharged from the outside of the system in a completely sealed state, and suction of the atmosphere at the time of discharging the dust is prevented.

Here, the portable closed type dust collecting dust storage / conveying means means that receives dust collecting dust from a dust collector such as a tank truck in a closed state and conveys it to another place for processing. Since the portable closed-type dust collection dust storage / transportation means is provided, the conventional dust transport equipment and dust storage bin are unnecessary.

Further, when the dust collecting dust is carried into the portable closed type dust collecting dust storing / conveying means, the gas in the portable closing type dust collecting dust storing / conveying means is moved toward the dust collector by the carrying of the dust. Although re-scattering occurs, the gas containing the re-scattered dust flows to the entrance side of the dust collector through the pressure-equalizing pipe because the pressure is equalized. Therefore, the dust collection performance does not deteriorate due to dust re-scattering.

[0011]

FIG. 1 is a conceptual diagram showing an embodiment of the present invention.
This is applied to an electric precipitator for collecting exhaust gas from a sinter ore manufacturing facility which is an iron making facility. Dust collector body 1
2 upper and lower discharge hoppers 4 as dust collection dust discharging means are arranged in the lower hopper 2 via a swing valve 3 as a shutoff valve, and the lower part of the discharge hopper 4 is portable and hermetically sealed via a flexible tube 16. The tank truck 5 which is a type dust collecting dust storage / transportation means is connected. The dust collector body 1 and the discharge hopper 4 are connected by a pressure equalizing pipe 7 having an opening / closing valve 6. The valve 20 is a dust removing valve.

Next, a method of discharging the dust collecting dust collected and accumulated in the lower hopper 2 of the dust collector body 1 in the above apparatus will be described. First, the on-off valve 6 arranged in the pressure equalizing pipe 7.
Is opened to equalize the pressure inside the dust collector body 1 and the pressure inside the tank truck 5. Next, the swing valve 3 built in the upper and lower discharge hoppers 4 is opened, and the dust collected and accumulated in the lower hopper 2 is discharged into the tank truck 5. As the dust inside the tank truck 5 is discharged, the pressure inside the tank truck 5 rises, and an upward gas flow is generated from the bottom. As a result, dust is scattered again. However, when the dust collecting dust is discharged to the tank truck 5, the open / close valve 6 arranged in the pressure equalizing pipe 7 is always opened, so that the gas containing the re-scattered dust passes through the pressure equalizing pipe 7 and flows into the dust collector main body. Since it is guided to the entrance side, the dust collection performance does not deteriorate due to the re-scattering of the dust.

Further, in this embodiment, the swing valves 3 built in the lower hoppers 4 provided in the upper and lower two stages are opened at the same time when the collected dust is discharged. However, as described in the prior art, the swing valves 3 are alternately opened. You may switch and operate.

In the above embodiment, the discharge hopper 4 provided in the lower part of the dust collector is vertically arranged in two stages.
It doesn't matter if it is a tier. In this case, a valve having an excellent sealing property may be used to seal the gas from the discharge hopper 4 with the outside of the system during normal operation of the dust collector.
In this case, by equalizing the pressure in advance, it is possible to reduce the driving ability of the swing valve 3 even when the inside of the dust collector has a large negative pressure.

[0015]

According to the present invention, the facility for transporting dust collected by the dry dust collector and the storage bin for the dust are simplified, so that the facility cost is greatly reduced. In addition, the maintenance of the equipment accompanying this is simplified.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing conventional equipment.

[Explanation of symbols]

 1 Dust collector body 2 Lower hopper 3 Swing valve 4 Discharge hopper 5 Tank lorry 6 Open / close valve 7 Pressure equalizing pipe 16 Telescopic pipe

Front Page Continuation (72) Inventor Kenji Anan 1-1 Tobahata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka New Nippon Steel Corporation Yawata Works

Claims (2)

[Claims] 1. A portable dust-collecting dust storage / conveying means is connected to a dust collecting dust discharging means connected to a lower portion of the dust collecting machine through a shutoff valve when the dust collecting machine is in operation, and the shutoff valve is closed. Of the dust-containing gas and the dust collecting dust discharging means or the portable closed type dust collecting dust storing / conveying means are pressure-equalized, and then the shutoff valve is opened to cut out the dust collecting dust. Dust collection method for dry dust collector. 2. A dust collecting dust discharging means connected to a lower part of the dust collector through a shutoff valve, a portable and sealed dust collecting dust storing / conveying means detachable therefrom, and the dust collecting dust discharging means or portable type. A dust-collecting dust discharging device for a dry-type dust-collecting device, which comprises a pressure-equalizing pipe that connects a closed dust-collecting dust storing / transporting device and a dust-containing gas-containing side of the dust-collecting device through an opening / closing valve.