JPH05184835A - Dry dust collector - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a dry dust collecting apparatus that can correct a blower that has failed without lowering the processing capacity of the dust collecting apparatus even if the blower of the one blowing apparatus fails. [Structure] Eight dust collecting elements 1 each form a dust collecting block 2 in groups of four. An injection pipe 6 is provided above the bag filter of each dust collecting element 1. The inlets of the four injection pipes 6 are communicated with each other through the injection pipe solenoid valves 7 through the compressed air common pipes 8, and the compressed air common pipes 8 pass through the compressed air supply pipes 9 and the blower opening / closing solenoid valves 10. And communicates with the blower 11. A pressure detection sensor 25 is connected to each blower 11 so that the pressure in the blower 11 can be detected and supplied to the controller 30. The two compressed air supply pipes 9 are communicated with each other by a compressed air communication pipe 12, and a solenoid valve 13 for a communication pipe is provided in the compressed air communication pipe 12.
Is provided. The solenoid valves 7, 10, 13 are connected to the controller 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry type dust collecting apparatus for collecting dust in gas by passing blast furnace gas or the like, and particularly to a pulse jet system for periodically removing dust adhering to a filter cloth. The present invention relates to a dry dust collector equipped with a scrubbing device.

[0002]

2. Description of the Related Art As a conventional dry dust collector, for example, there is one described in Japanese Patent Publication No. 58-24168. The dust collector consists of a dust-free gas chamber that communicates with the upper side of the lower chamber into which dust-containing gas is sent via a bag filter.
The dust-containing gas such as blast furnace gas sent to the lower chamber is sent to the upper chamber while being filtered by the bag filter, and the dust-free gas is discharged from the outlet provided in the upper chamber.

In the bag filter, the upper and lower chambers are separated by a horizontal tube plate, and a sleeve-like filter cloth for removing dust in the gas is provided at a plurality of concentric openings formed in the tube plate. Is configured. Above the tube plate, a jetting pipe of a shuffling device of a pulse jet system is arranged. The injection pipe has a plurality of nozzles that can vertically face an opening formed in a concentric circle in a tube plate and extends in the radial direction of the concentric circle, while rotating around the center of the concentric circle. , High-pressure air is ejected from the nozzle in a predetermined time cycle, the high-pressure air is made to collide with the filter cloth facing at that time through the opening, and the vibration adheres to the dust adhered to the filter cloth. To keep the pressure loss of the filter cloth below the design value.

Since the bag filter has a slower filtration speed than other methods, it is necessary to increase the filtration area of the bag filter formed by the filter cloth in order to filter blast furnace gas and the like. In view of the maintenance efficiency of the filter cloth, a plurality of bag filters are arranged. Further, due to the problem of the blower processing capacity of the shuffling device, it is usual that the plurality of bag filters are divided into a plurality of blocks, and a separate shuffling device is provided for each block.

[0005]

However, in the above-mentioned conventional dust collector, since the individual scrubbing devices are arranged in one-to-one correspondence with the blocks of the bag filter, the specific scrubbing device is provided. If the blower fails, the high-pressure air for dust removal will not be sent to the block corresponding to the broken-off device, the filter cloth of the bag filter will be clogged, and the pressure loss of the bag filter will be above the design value. The dust removal processing capacity at the point of time decreases. Therefore, it is necessary to process the dust removal processing for the block whose dust removal capability has deteriorated by the bag filter of another block and the bag filter of the block is overloaded, or if it is tried to suppress it, There is a problem that it is necessary to suppress the processing of the upstream plant such as the blast furnace processing that is in communication with the dust collector.

The present invention has been made in view of the above-mentioned problems, and even if one blower of the blow-off device fails, the blower that has failed without lowering the processing capacity of the dust collector. It is intended for a dry dust collector that can correct.

[0007]

In order to achieve the above object, a dry dust collecting apparatus of the present invention has a plurality of bag filters, and the plurality of bag filters are divided into a plurality of blocks. A dust device, a pressure air injection pipe provided individually above each bag filter and having its tip end opposed to the bag filter, and an injection pipe solenoid valve provided at the inlet of each pressure air injection pipe and opened and closed at a predetermined cycle, A compressed air common pipe that communicates the inlet of each injection pipe through the solenoid valve, a compressed air supply pipe that connects one end to the compressed air common pipe, and a high pressure air that is connected to the other end of the compressed air supply pipe. In a dry dust collector provided with a blower capable of removing each block, a blower opening / closing solenoid valve provided at the outlet of each blower and in an open state, and compressed air supply pipes of each block Communicate with A failure occurs when a communication pipe, a solenoid valve for the communication pipe which is provided in the middle of the communication pipe and is in a closed state, a failure detection unit that detects a failure of each blower, and a failure signal is input from the failure detection unit. The blower opening / closing solenoid valve is closed, the communication pipe solenoid valve of the communication pipe communicating in the middle of the compressed air supply pipe communicating with the defective blower is opened, and the open connection solenoid valve is opened. And a controller for delaying the opening / closing cycle of the injection pipe solenoid valve of each block to which high pressure air is supplied through the compressed air supply pipe communicating with the communication pipe provided with the valve.

[0008]

In normal operation, that is, when each blower of the blow-off device is operating normally, high pressure air is supplied from the blower to the common compressed air pipe through the compressed air supply pipe for each block. Then, the electromagnetic valves provided at the inlets of the respective compressed air injection pipes are periodically opened and closed, whereby high pressure air is supplied to the compressed air injection pipes corresponding to the opened electromagnetic valves, and the tips of the compressed air injection pipes are supplied. The high-pressure air is jetted to the filter cloth of the bag filter facing the section to momentarily vibrate the bag filter, thereby removing dust adhering to the bag filter and suppressing clogging of the bag filter. The pressure loss is maintained below a predetermined value.

At this time, if a blower of a blow-off device fails, high-pressure air is not supplied to the pressure-gas common pipe of the block corresponding to the blower, and dust adhering to the filter cloth of the bag filter of the block can be blown off. Instead, the bag remains clogged, the pressure loss of the bag filter increases, and the dust removal processing capability decreases. However, in the present invention, the failure signal corresponding to the failure of the blower is transmitted to the controller from the failure detection unit that detects the failure of the blower by detecting the pressure loss of each bag filter or the pressure generated from the blower. Then, the controller shuts off the blower from the compressed air supply pipe by closing the connection between the defective blower and the compressed air supply pipe by operating the blower opening / closing solenoid valve to close the compressed air supply pipe. Open the solenoid valve for communication piping of the communication piping that communicates with the middle of the piping,
Further, the opening / closing cycle of each injection pipe solenoid valve, which communicates with each pressure air supply pipe that communicates with the communication pipe solenoid valve that is in the open state, is doubled, for example.

As a result, the high pressure air is supplied to the block corresponding to the failed blower from the blower supplying the high pressure air to another block. At this time,
By delaying the opening / closing cycle of the corresponding solenoid valve for each injection pipe, the number of jets per unit time in each block is reduced and the blower becomes overloaded, or the pressure of high pressure air injected from the injection pipe becomes low. Is being prevented.

[0011]

Embodiments of the present invention will be described with reference to the drawings.
First, the configuration will be described. As shown in FIGS. 1 to 4, the dry dust collecting apparatus includes eight dust collecting elements 1, and the eight dust collecting elements 1 are arranged in a line with four dust collecting elements 1 each. Dust collecting blocks 2 are formed respectively, and the two sets of dust collecting blocks 2 are formed.
Are arranged in parallel in two rows. A duct for distributing the dust-containing gas sent from a blast furnace (not shown) or the like between the two dust collecting blocks 2 to each dust collecting element 1 and discharging the gas removed by each dust collecting element 1. 3 are provided.

The dust collecting element 1, as shown in FIG.
By the tube plate 4 arranged horizontally, the upper and lower two chambers 1a, 1
The lower chamber forms a dust-containing gas chamber 1a and the upper chamber forms a dust-free gas chamber 1b. The lower side of the dust-containing gas chamber 1a serves as a hopper to form a dust collecting chamber 1c for accumulating dust removed from the dust-containing gas. A solenoid valve 31 is connected to a pipe for discharging dust accumulated in the dust collecting chamber 1c.

As shown in FIG. 4, the tube plate 4 is provided with a plurality of concentric filter holes 4a, and each of the filter holes 4a has a sleeve-like or envelope-like filter as shown in FIG. The cloth 5 is fixed and disposed in the dust-containing gas chamber 1a. An injection pipe 6 is provided above the tube plate 4. The injection pipe 6 is extended in the radial direction of the tube plate 4, and a plurality of nozzles 6a are provided on the lower surface of the injection pipe 6 at a predetermined interval. It is possible to face each other at intervals. The injection pipe 6 is provided with a driving device composed of a motor and a speed reducer at the upper part thereof, and is rotated along the upper surface of the tube sheet 4 at a predetermined speed around the center of the tube sheet 4 by the driving device. ing.

The dust collecting blocks 2 arranged in a line
The inlets of the injection pipes 6 provided in each of the four dust collection elements 1 constituting the above are communicated with the compressed air common pipe 8 via separate injection pipe solenoid valves 7 for each dust collection block 2, and the compressed air The common pipe 8 is connected to one end of the compressed air supply pipe 9 on the dust-free gas discharge side, and the other end side of each compressed air supply pipe 9 supplies an individual blower 11 which supplies high pressure air through the blower opening / closing solenoid valve 10. Is in communication with. A pressure detection sensor 25 is connected to each blower 11 so that the pressure in the blower 11 can be detected and supplied to the controller 30.

Further, the compressed air supply pipe 9 provided for each dust collection block 2 is communicated with a compressed air communication pipe 12 in the middle of the compressed air supply pipe 12, and a solenoid valve 13 for a communication pipe is provided in the compressed air communication pipe 12.
Is provided. Further, as shown in FIG. 6, the duct 3 is vertically divided by a partition plate 16 that is inclined from the upper part of the gas intake port 14 toward the lower part of the gas discharge port 15, and the lower part is included. The dust gas duct 17 and the dust-free gas duct 18 are formed on the upper side.

An auxiliary duct 19 is provided on the lower surface of the dust-containing gas duct 17 so as to communicate with the dust-collecting chambers 1c of the respective dust-collecting elements 1 from the side. The dust collecting element 1 can be supplied to the upper part of the dust-containing gas chamber 1a. Further, the dust-free gas duct 18 is vertically divided by a horizontal flat plate 20, and a gas can flow through a gas communication port 20a provided in the flat plate 20. The upper chamber is also partitioned at the boundary of the dust collecting element 1, and the partitioned chamber is also partitioned into two by the baffle plate 21 to be partitioned into a total of eight chambers. In each of the compartments, a hole 22 which is a communication passage provided in one-to-one correspondence with the dust-free gas chamber 1b of the dust collecting element is provided in the side wall portion of the dust-free gas chamber 1b.

A cylinder device 23 having a diameter larger than that of the communication port 21a faces above the gas communication port 21a provided in the flat plate 20, and the disc 23 is connected on the upper side. It is possible to move up and down by 24, and the communication port 21a can be closed. Further, as shown in FIG. 4, each of the solenoid valves 7, 10, 13 is connected to a controller 30 and opened / closed by a command from the controller 30. And
The controller 30 controls the electromagnetic valves 7 for injection pipes to be periodically opened, for example, at a cycle of 2 or 3 times per minute in a normal time, and in the normal time, the electromagnetic valve 7 for a communication pipe is controlled. Solenoid valve 10 for opening and closing the blower with the valve 13 closed
Is controlled to the open state.

In the dry dust collector as described above, the dust-containing gas sent from the blast furnace or the like is taken into the dust-containing gas duct 17 from the gas suction port 14 of the duct 3 and is assisted from the dust-containing gas duct 17. The dust-containing gas chamber 1a of each dust collecting element 1 is introduced through the duct 19, and the dust in the gas is further removed by the filter cloth 5 and sent to the dust-free gas chamber 1b. The dust-free gas is used in the holes 22 formed in the wall.
The gas is sent to the upper chamber of the dust-free gas duct 18 via a gas communication port 21a formed in the flat plate 20 and discharged to the lower chamber of the dust-free gas duct 18 via a gas discharge port 15.

At this time, for each dust collection block 2, high pressure air is sent from each blower 11 through the compressed air supply pipe 9 to the compressed air common pipe 8, that is, the inlet of the injection pipe 6 of each block 2. At this time, the injection pipe solenoid valve 7 controlled by the controller 30 is opened for a predetermined time at a predetermined time unit, for example, twice per minute, and the solenoid valve 7 is opened for high pressure air. It is sent into the injection pipe 6 and jetted downward through the nozzle 6a. The high-pressure air jetted hits the filter cloth 5 through the filter holes 4a of the tube sheet 4 facing each other at that time, and the filter cloth 5 is momentarily vibrated to remove dust adhering to the filter cloth 5. It is dropped and deposited in the lower dust collecting chamber 1c.

The dust accumulated in the dust collecting chamber 1c is discharged from the dust collecting element 1 by opening the rotary valve 31 at a predetermined timing. At this time, if one of the blowers 11 fails, high-pressure air cannot be supplied to the compressed air common pipe 8 and the injection pipe 6 of the dust collection block 2 connected to the blower 11, and the filter cloth 5 of the bag filter of the block 2 is blocked. The dust adhering to the four dust collecting elements 1 of the other dust collecting block 2 is reduced because the pressure loss of the four dust collecting elements is not allowed and the dust removing function is lowered.
The load is applied and it becomes an overload state.

At this time, when the sensor 25 connected to the blower 11 transmits a failure signal indicating that one of the blowers 11 has failed to the controller 30, the blower provided at the outlet of the failed blower 11 is transmitted. The solenoid valve for opening / closing 10 is closed, and the solenoid valve 13 for communication piping is connected.
Is opened, and the opening / closing cycle of the injection pipe solenoid valve 7 of the two dust collecting blocks 2 is doubled, for example, the state of being opened twice a minute is changed to an opening state of once a minute.

As a result, even if one of the blowers 11 fails, the other blower 11 temporarily suspends the supply of high-pressure air, so that the dust removal performance of the dust collecting element 1 corresponding to the failed blower 11 is reduced. The other dust collecting element 1 will not be overloaded without causing it. At this time, by delaying the opening / closing cycle of all the injection pipe solenoid valves 7 to twice, high-pressure air having a predetermined pressure can be ejected from each injection pipe 6 without changing the load of the blower 11. In this manner, the defective blower 11 is repaired or replaced with another blower while the one blower 11 is being turned over.

In the above embodiment, the dust collecting blocks 2 are two sets, but the present invention may be applied to a dry dust collecting apparatus having three or more sets of dust collecting blocks. Also, blower 11
The opening / closing cycle of the injection pipe solenoid valve 7 at the time of failure is set to twice as long as the normal time, but may be shorter than twice as long as the blower 11 has sufficient processing capacity.

Further, the failure of the blower 11 may be detected by checking whether or not the pressure loss of the bag filter has increased beyond the allowable value.

[0025]

As described above, in the dry dust collector of the present invention, even if the blower of one shredding device fails, the dust removal processing capability of the bag filter corresponding to the shredding device is reduced. It is possible to repair or replace a defective blower.

[Brief description of drawings]

FIG. 1 is a side view showing a dry dust collecting apparatus according to an embodiment of the present invention.

FIG. 2 is a top view of the same.

FIG. 3 is a partially cutaway side view seen from the discharge port side.

FIG. 4 is a schematic configuration diagram showing a dry dust collecting apparatus according to an embodiment of the present invention.

FIG. 5 is a view showing a tube sheet of an embodiment according to the invention.

FIG. 6 is a side sectional view showing a duct of a dry dust collecting apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 1 Dust collecting element 1a Dust-containing gas chamber 1b Dust-free gas chamber 2 Dust collecting block 4 Tube plate 5 Filter cloth 6 Injection pipe 7 Injection pipe solenoid valve 8 Common air pipe 9 Pressure air supply pipe 10 Blower opening / closing solenoid valve 11 Blower 12 Pressure air Communication pipe 13 Solenoid valve for communication pipe 25 Pressure sensor 30 Controller

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Keiji Matsuda 1-chome, Mizushima Kawasaki-dori, Mizushima Kurashiki City, Okayama Prefecture (No address) Inside Mizushima Works, Kawasaki Steel Co., Ltd. (72) Hideyuki Maejima Wadazaki, Hyogo-ku, Kobe City, Hyogo Prefecture 1-1-1 Machi Mitsubishi Heavy Industries Ltd. Kobe Shipyard

Claims (1)

[Claims] 1. A dry dust collector having a plurality of bag filters, the plurality of bag filters being divided into a plurality of blocks, each of which is individually disposed above each of the bag filters and has a tip end having a bag filter. A pressure air injection pipe, an injection pipe solenoid valve provided at the inlet of each pressure air injection pipe and opened and closed at a predetermined cycle, and a pressure air common pipe communicating the inlets of the respective injection pipes through the solenoid valve. Each of the blocks is provided with a blow-off device including a compressed air supply pipe having one end connected to the compressed air common pipe and a blower connected to the other end of the compressed air supply pipe and capable of supplying high-pressure air. In a dry dust collector, a blower opening / closing solenoid valve that is provided at the outlet of each blower and is in an open state, a communication pipe that connects the compressed air supply pipes of each block, and a closed state that is provided in the middle of the communication pipe It has become Connected to the solenoid valve for communication piping, failure detection means for detecting a failure of each blower, failure detection means, solenoid valve for injection pipe, solenoid valve for opening / closing blower, and solenoid valve for communication piping, and connecting from the failure detection means When a failure signal is input, close the blower opening / closing solenoid valve of the failed blower, and open the communication piping solenoid valve provided in the communication piping that communicates with the compressed air supply piping that communicates with the failed blower. State, and further delays the opening / closing cycle of each injection pipe solenoid valve connected to the pressure air supply pipe communicating with the communication pipe provided with the communication pipe solenoid valve in the open state via the pressure air common pipe. A dry dust collector comprising a controller.