KR100657571B1 - Device for replacing a damaged filter-bag with a new one and the method of using it - Google Patents

Abstract

The present invention provides a selective inspection and filter bag replacement operation for a chamber in which a damaged filter bag is installed in a load operation state of a dust collector when detecting a filter-bag damage of a dust collector that collects coke dust generated during coke production. An object of the present invention is to provide a filter bag replacement device and a method of replacing a damaged filter bag using the same.

The damaged filter bag replacement apparatus according to the present invention, in the dust collector and the dust collection and the dust-exhaust action alternates for each chamber for the filtering of the dust-containing air containing coke dust generated during coke production, the lower chamber of the adjacent chambers A connecting pipe 20 installed to be in communication; Opening and closing valve 21 is installed on one side of the connecting pipe for opening and closing of the connecting pipe; A control valve 22 installed in the upper chamber to supply external air into the chamber; And controlling the operation of the inlet damper 11, the outlet damper 12, the dust discharge valve 8, the connecting pipe open / close valve 21 and the control valve 22 and receiving a detection signal from the dust detector 9. And a control unit 10.

Coke, Dust, Dust Collector, Filter Bags, Replacement, Maintenance, Chamber

Description

Device for replacing a damaged filter bag of dust collector and a method for replacing a damaged filter bag using the same {Device for replacing a damaged filter-bag with a new one and the method of using it}

1 is a schematic view showing a conventional dust collector.

2 is a schematic diagram showing a dust collector provided with a device for replacing a damaged filter bag according to an embodiment of the present invention.

3 is a schematic diagram conceptually illustrating a process in which dust collecting and dedusting operations of a general dust collector are sequentially generated.

4 is a block diagram illustrating a controller function of an apparatus for replacing a damaged filter bag according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

1: filter bag 2: inlet duct

3: lower chamber 5: upper chamber

6: exhaust duct 7: suction fan

8: Dust discharge valve 11: Inlet damper

12: outlet damper 20: connector

21: on-off valve 22: control valve

23: compressor 24: headpipe

25: diaphragm valve 26: blow tube

27: nozzle

The present invention is a dust collector for collecting coke dust generated during the manufacture of coke (Coke), the filter-bag (bag-bag) damage detection in the load operation state of the dust collector when detecting the damage of the filter bag installed in the selective inspection and filter bag replacement The present invention relates to a device for replacing a damaged filter bag of a dust collector and a method of replacing a damaged filter bag using the same.

In general, coal used as fuel in the blast furnace operation of steel mills is first heat treated in a coke oven to be produced as coke, and the extruded coke is extruded to extinguish the coke produced in the coke oven. Dry Quenching (hereinafter referred to as 'CDQ'), and in order to collect dust because a large amount of coke dust (Coke Dust) is generated in particular during the CDQ digestion of red coke as shown in Figure 1 Dust collector is used.

Referring to Figure 1, the dust collection process, the air containing the coke dust through the inlet duct (2) connected to the CDQ equipment (not shown) by the operation of the suction fan (7) inside the lower chamber (3) of the dust collector Flowed into the upper chamber (5) after being filtered by a plurality of filter bags (1) installed in the diaphragm (4) in the chamber, and flows out through the discharge duct (6) Discharged. At this time, a number of fine pores are formed on the surface of the filter bag 1, only clean air of the vacuum containing air filtered by the filter bag 1 flows through the filter bag 1 to the upper chamber (5) and the particle size Large coke dust is collected as it adheres to the surface of the filter bag 1.

Reference numerals 24 and 26 denote head pipes and blow tubes for filter bag dust removal by spraying high pressure air, respectively. The air supply pipe is surrounded and protected by the head pipe.

However, the coke dust collected by such a dust collector has a hardness and a sharp edge of a certain degree or more, and wears the filter bag (1) during the dust collection process, and after a certain time passes the breakage and breakage of the filter bag (1) There was a problem caused. In particular, the damage of the filter bag is introduced into the atmosphere through the discharge duct 6 after the coke dust is introduced into the upper chamber 5 from the lower chamber 3 by the suction force of the suction fan 7 through the damage portion. There was a problem causing environmental accidents to be discharged.

Therefore, dust detectors (not shown) are usually installed at one side of the discharge duct (usually installed in a stack of dust collecting equipment) to detect such an environmental accident (legal reference value: 50 mg / Nm³ or less) at an early stage. In addition, the data from the dust detector is transmitted to the PC of the cab (not shown) and displayed or generates an alarm so that the driver can recognize the damage to the filter bag.

When the driver is aware of such an environmental accident, the operator of the dust collector will be notified by wire or wirelessly.The manager of the dust collector will stop the dust collector in order to take an early action on the environmental accident, and then check the chamber where the dust leakage occurred. Filter bag replacement will be performed.

However, such a conventional damaged filter bag check and replacement work has to stop the entire dust collector, so that the air suction input into the chamber by the suction fan disappears, and thus it is adsorbed on the surface of the filter bag in a caking state. The coke dust is detached at a time and falls to the lower part of the dust collecting chamber by gravity. At this time, a large amount of outflow to the outside of the dust collecting chamber through the gap formed by the wear of the slide gate and the rotary valve caused a dust bombing phenomenon, causing a secondary environmental accident.

In addition, there is a problem in that the driving motor of each facility is overloaded because the amount of dust to be transported from the dust collection chamber to the flow conveyor, the scraw conveyor, the bucket elevator is rapidly increased.

In addition, the extrusion and charging operations are delayed until the inspection and replacement work is completed, such that productivity is greatly reduced.

The present invention has been proposed to solve this problem, and the damage filter bag of the dust collector to allow the selective inspection and filter bag replacement work for the chamber in which the damaged filter bag is installed in the load operation state of the dust collector when detecting the damage to the filter bag of the dust collector It is an object to provide a replacement device and a method of replacing a damaged filter bag using the same.

The apparatus for replacing a dust filter bag of the dust according to the present invention for achieving the above object is connected to the inlet duct through which the air containing the coke dust generated during manufacture of the coke is introduced, and an inlet damper for flow control. A plurality of chambers including a lower chamber and an upper chamber communicating through a filter bag installed in the lower chamber, an exhaust duct connected to the upper chamber through a flow control outlet damper, and an air suction input from the inlet duct to the exhaust duct; Including a suction fan connected to the discharge duct, a dust discharge valve installed in the lower portion of the lower chamber and a dust detector for detecting the coke dust contained in the air discharged through the discharge duct, the dust collection and dust removal sequentially for each chamber In the dust collector where the action is alternated, the lower chambers of adjacent chambers are installed to communicate with each other. Connectors; An opening and closing valve installed at one side of the connecting pipe to open and close the connecting pipe; A control valve installed in the upper chamber to supply external air into the chamber; And a control unit for controlling the operation of the inlet damper, the outlet damper, the dust discharge valve, the connecting pipe open / close valve and the control valve and receiving a detection signal from the dust detector.

On the other hand, the filter bag replacement method using the filter bag replacement device as described above, detecting the chamber (hereinafter referred to as 'target chamber') to discharge the coke dust exceeding the reference value by the detection signal from the dust detector during dust collector operation. step; Closing the inlet damper, outlet damper and dust discharge valve of the target chamber; Selecting a chamber (hereinafter, referred to as a 'selection chamber') in which a dust removal action is not generated among the chambers adjacent to the target chamber; Opening an on / off valve of a connection pipe connecting the selection chamber and the target chamber; And opening a control valve installed in the target chamber.

Hereinafter, a device for replacing a damaged filter bag of a dust collector and a method of replacing a damaged filter bag using the same will be described with reference to the accompanying drawings.

First, the structure of the dust collector will be briefly described with reference to FIG. 2.

The dust collector filters the dust-impregnated air introduced through the inlet duct 2 connected to the CDQ facility (not shown) by means of a plurality of filter bags 1 installed in the diaphragm 4 in the chamber. After inhalation in 5), it is configured to discharge to the outside through the discharge duct (6) connected to the upper chamber (5). At this time, the inlet damper 11 is installed between the inlet duct 2 and the lower chamber 3, and the outlet damper 12 is also provided between the outlet duct 6 and the upper chamber 5, The flow rate of the clean air discharged into the chamber or the clean air discharged out of the chamber can be controlled.

In addition, the suction duct 6 is connected to the discharge duct 6 so that the air suction input is generated from the inlet duct 2 side to the discharge duct 6 side, and the discharge duct 6 (in the actual dust collecting equipment, mainly in the stack). However, in the present description, the meaning of the discharge duct is broadly regarded as that the stack is included in the discharge duct), and a dust detector (not shown) is installed so that the coke dust contained in the air discharged through the discharge duct 6 is installed. To be detected.

On the other hand, the chambers 3 and 5 of the dust collector have a structure in which a plurality of chambers are connected to each other instead of a single chamber, and the dust collection and the dust removal action are alternately performed for each chamber. That is, in each of the chambers indicated by A to H in Fig. 2 is configured in a dust removal circuit to perform the dust removal action, for example, in the order of chamber A, B, C ... The dust collector is operated in the same manner as the dust collection operation is performed in the chamber where the dust removal is not performed.

3 is a conceptual diagram for explaining the dust collecting action and the dust removal action, the dust collecting action is made in the state in which the inlet damper 11 and the outlet damper 12 is open as described above, the dust removal action is the outlet damper of the chamber ( 12) the high pressure (4-6kg / m 3) air produced by the compressor 23 is blown with the diaphragm valve 25 while the inflow of the vacuum air into the lower chamber 3 is blocked. By instantaneous spraying through the tube 26 through the nozzle 27 into the filter bag 1, the caking dust formed on the surface of the filter bag is detached by the impact applied to the filter bag 1 and the lower chamber 3 is removed. Air jet pulsing (Air Jet Pulsing) method to fall to the bottom of the.

At this time, the lower portion of the lower chamber (3) is provided with a dust discharge valve (8) is discharged dust collected to the outside to transfer to the conveyor belt. It is preferable to use a rotary valve as the dust discharge valve (8). Unexplained symbol P denotes an air supply pipe for supplying the high pressure air from the compressor to the blow tube, and reference numeral 24 denotes a head pipe surrounding the air supply pipe for protecting the air supply pipe at the upper chamber inlet.

Next, with reference to Figure 2 looks at the device for replacing the damaged filter bag of the dust collector installed in such a dust collector.

As can be seen in Figure 2, the lower chamber 3 is provided with a connecting pipe 20 for connecting the lower chamber (ie chamber C-A-B, chamber G-E-C, chamber H-G-E, etc.) connected to each other in communication. Since the lower chambers 3 connected to each other are connected to each other by the connecting pipe 20, all the lower chambers have a structure in which they can communicate with each other. At this time, the opening and closing valve 21 for opening and closing the connecting pipe is installed in the middle of each connecting pipe 20. While the dust collector is normally operated, the opening and closing valve 21 is closed so that each lower chamber 3 is mutually closed. It is separated into separate spaces. As the on-off valve 21, a shuttle valve is used.

In addition, the upper chamber 5 is provided with a control valve 22 for opening air if necessary and supplying clean air into the chamber so that air flows from the upper chamber 5 to the lower chamber 3. The function of this regulating valve is mentioned later.

4, each of the inlet damper 11, the outlet damper 12, the dust discharge valve 8, and the connection pipe opening / closing valve 21 is connected to the control unit 10. Each damper and valve is opened and closed according to the control signal. The control unit 10 also receives the detection signal from the dust detector 9 and transmits the necessary control signal depending on whether the dust contained in the air discharged to the outside through the discharge duct 6 exceeds the reference value.

It is preferable that the control valve 22 and the suction fan 7 are also controlled by the control unit 10.

With reference to Figures 2 to 4, looks at how to replace the damaged filter bag in the dust collector load operation state using a device for replacing the damaged filter bag of the dust collector as described above.

[Step for detecting chamber to be inspected]

Assuming that the dedusting action is sequentially generated from the chamber A shown in FIG. 2 in the order of B, C, D ..., the inlet damper 11 and the outlet damper 12 of the chamber A are closed, and then the dedusting action is performed. When generated, the coke dust adsorbed on the surface of the filter bag 1 is detached and falls to the lower part of the chamber, and part of it stays inside the lower chamber 3 in a floating state. At this time, when the inlet damper 11 and the outlet damper 12 of the chamber A are opened for the dust removal action in the next chamber B, the floating dust is damaged by the suction force of the suction fan 7. After entering the lower chamber (3) through the upper chamber (5) through the discharge duct (6) is discharged to the outside, at this time the amount of dust by the dust detector (9) installed in the discharge duct (6) Excess is detected.

By the detection signal from the dust detector 9, the controller 10 detects that the chamber in which the damaged filter bag is installed is chamber A.

In addition, the inspection target chamber may be detected by a differential pressure gauge (not shown) which detects the occurrence of the differential pressure between the upper chamber 5 and the lower chamber 3. That is, when the dust collector is operated with the filter bag first installed, the differential pressure between the upper chamber and the lower chamber is about 100 mmAq or more, and the differential pressure increases gradually as the operation time of the dust collector becomes longer, and the differential pressure reaches 250 mmAq. If it is determined that the life of the filter bag has ended. At this time, if the pressure in the lower chamber is suddenly moved to the upper chamber due to the local damage of the filter bag, the differential pressure decreases rapidly. Using this, a pressure gauge is installed in each of the upper chamber and the lower chamber and the pressure difference received from the upper chamber is detected. By doing so, it is possible to detect a chamber in which the filter bag is damaged. This detection method may be used alone or in combination with the above detection method by the dust sensor.

[Step of excluding the inspection target chamber from the dust removal circuit]

After the inspection target chamber A is detected as described above, the controller 10 closes the inlet damper 11, the outlet damper 12, and the dust discharge valve 8 of the chamber A, and the chamber B, which is connected to the chamber A, The opening / closing valve 21 of the connection pipe 20 is opened so that the chamber C in which the dust removal action is not generated in C communicates with the chamber A.

At this time, inside the lower chamber of the chamber A, the floating dust is sucked into the chamber C from the chamber A through the open connection pipe 20 so that air flow from the upper chamber 5 of the chamber A to the lower chamber 3 can occur. It is preferable to form a differential pressure of 20 mmAq or less, and for this purpose, the opening and closing amount of the control valve 22 installed in the upper chamber 5 is controlled by the controller 10.

Further, the controller 10 excludes the chamber A from the exhaust circuit configured to proceed in the order of the chambers A to H, so that the dust removal action is not generated in the chamber A.

[Replacement of damaged filter bag]

By controlling the operation of the dust collector as described above, the differential pressure state in which the reverse air is generated in the direction of the lower chamber 3 from the upper chamber 5 of the chamber A is maintained and the chamber A is excluded from the dust removal circuit so that no further dust removal action occurs. The maintenance worker opens the door and enters the upper chamber 5 to replace the damaged filter bag.

At this time, it is possible to replace the filter bag as the filter bag (1) is hanging on the partition wall 4 can reduce the maintenance work time, the differential pressure from the upper chamber (5) to the lower chamber (3) direction The formation of a back wind prevents dust from entering the eyes of workers and the occurrence of industrial safety hazards that damage the eyes.

In addition, it is possible to selectively repair and maintain the damaged filter bag 1 without stopping the entire dust collector.

According to the apparatus for replacing a damaged filter bag of a novel filter having a structure as described above and a method of replacing a damaged filter bag using the same, the differential pressure acts by excluding only the chamber in which the damaged filter bag is installed from the dust collection circuit without the need to stop the entire operation of the dust collector. The operator can enter the chamber to perform maintenance work on the filter bag.

Thus, the efficiency of the dust collector is greatly improved, and the operator can replace the damaged filter bag in a safer state.

Claims (4)

An inlet duct (2) into which air containing coke dust generated during coke production is introduced, a lower chamber (3) connected to the inlet duct through an inlet damper (11) for flow control, and a filter bag (1) installed in the lower chamber (1). A plurality of chambers having an upper chamber (5) communicated through), an outlet duct (6) connected to the upper chamber through a flow control outlet damper (12), and air suction input from the inlet duct to the outlet duct A dust detector 9 which detects coke dust contained in the air discharged through the suction fan 7 connected to the discharge duct, the dust discharge valve 8 installed at the lower portion of the lower chamber, and the discharge duct so that the discharge duct is generated. It includes, as a device for replacing a damaged filter bag used in the dust collector in which the dust collection and dust extraction action sequentially by chamber, A connecting pipe 20 installed so that lower chambers of adjacent chambers communicate with each other; Opening and closing valve 21 is installed on one side of the connecting pipe for opening and closing of the connecting pipe; A control valve 22 installed in the upper chamber to supply external air into the chamber; And And a control unit (10) for controlling the operation of the inlet damper, the outlet damper, the dust discharge valve, the connecting pipe open / close valve and the control valve and receiving a detection signal from the dust detector. Replacement device. A method for selectively inspecting a chamber in which a damaged filter bag is installed in a dust collector load operation state by using the apparatus for replacing a damaged filter bag according to claim 1 and replacing the damaged filter bag, Detecting a chamber (hereinafter referred to as a “subject chamber”) in which a damaged filter bag is installed during operation of the dust collector; Closing the inlet damper, outlet damper and dust discharge valve of the target chamber; Selecting a chamber (hereinafter, referred to as a 'selection chamber') in which a dust removal action is not occurring among the chambers adjacent to the target chamber; Opening an on / off valve of a connection pipe connecting the selection chamber and the target chamber; And Replacing a damaged filter bag comprising the step of opening the control valve installed in the chamber. The method of claim 2, And after the on / off valve of the connection pipe connecting the target chamber and the selection chamber is opened, removing the target chamber from the dust-release operation circuit. The method according to claim 2 or 3, A differential pressure of 20 mmAq or less is generated in the lower chamber of the target chamber so that floating dust is sucked into the selection chamber from the target chamber through the open connection pipe and air flows from the upper chamber to the lower chamber of the target chamber. How to replace damaged filter bag.

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