JP2550076Y2 - Direct sludge removal equipment for refining furnace dust collectors - Google Patents

Description

[Detailed description of the invention]

[0001]

This invention is based on the idea that dust in gas generated during blowing in a refining furnace such as a converter, open hearth furnace, or electric furnace is removed from a water collection pit when the primary dust catcher is used to wash and remove the dust. It relates to a direct sludge removal device.

[0002]

2. Description of the Related Art In a refining furnace such as a converter, an open hearth furnace, or an electric furnace, exhaust gas containing ultrafine iron oxide dust is generated during blowing. For example, taking a converter as an example, the gas generated by converter blowing is a high-temperature CO containing fine iron oxide powder.
Mainly gas, 12 to 30 minutes of steel making time
It is intermittent and limited only during the blowing operation for up to 18 minutes, and has the special property of being a large amount of gas. This gas treatment method is roughly classified into a combustion type and a non-combustion type.

[0003] In the combustion method, a sufficient gap is provided between a converter furnace mouth and a hood, and sufficient air necessary for combustion of CO gas is pushed in by a secondary blower, and the gas is discharged through a hood and a flue following the hood. It is common to burn and produce a high-temperature gas of 1600 ° C. or higher, and recover the latent heat and sensible heat exchange as steam by an exhaust heat boiler constituting a flue. Then, prior to release to the atmosphere, electric precipitators, venturi scrubbers,
The dust is removed by a dust filter such as a bag filter. On the other hand, in the non-combustion system, a skirt is provided between the converter furnace port and the flue so as to prevent combustion of the exhaust gas from the converter, and the intrusion of air from the furnace port is blocked to prevent the gas-cooled flue and the wet type flue. It is common to collect unburned gas through a dust collector.

[0004] As shown in FIG. 4, gas containing ultrafine iron oxide dust and the like generated at the time of blowing in the refining furnace 31 is introduced into the flue 32 from the furnace port of the refining furnace 31, and from the upper part by the primary dust catcher 33. The dust is collected by the washing water sprayed from the washing water supply pipe 34. The collected dust falls through the lower water sealing duct 35 of the primary dust catcher 33 and is collected in the water collecting pit 36. The mud that overflows from the water collecting pit 36 is discharged from the overflow tank 37 through the mud pump 38. Delivered to processing equipment. On the other hand, the exhaust gas from which dust has been removed is introduced into a secondary dust collector (not shown) by a conduit 39.

[0005]

The dust removed by the primary dust catcher 33 from the gas generated during the blowing of the smelting furnace 31 typified by FIG. 4 overflows from the water collecting pit 36 and overflows into the overflow tank 37. Is sent to a water treatment facility by a sludge pump 38 for treatment. However, since the dust having a large particle size accumulates at the bottom of the water collecting pit 36 without overflowing, the lower water sealing duct 35 of the primary dust catcher 33 is closed unless the sludge is constantly monitored and manually dewatered, and the washing water is discharged. It will not fall into the water collecting pit 36. Further, the sludge pump 38 is severely worn by the dust in the overflowing muddy water, making it extremely difficult to perform maintenance and operation and maintenance.

[0006] The purpose of this invention is to remove dust that falls from the lower water seal duct of the primary dust catcher in the refining furnace or the like into the water collecting pit without accumulating at the bottom of the water collecting pit without overflowing. An object of the present invention is to provide a device capable of performing mud.

[0007]

Means for Solving the Problems The present inventors have conducted various studies to achieve the above object. As a result, during the blowing of a refining furnace such as a converter, the dust-containing wastewater that has fallen into the water collection pit from the lower water seal duct of the primary dust catcher is discharged from the vicinity of the bottom of the water collection pit by a pump, and is not blown. Inside is
By circulating the dust-containing wastewater drained by the pump from near the bottom of the water collection pit to the water collection pit and stirring it,
We arrived at this idea after finding that dust accumulation at the bottom of the catchment pit could be prevented.

That is, in this invention, a smelting furnace and a primary dust catcher containing a washing nozzle are connected by a flue, and a water sealing duct below the primary dust catcher is immersed below the liquid level of a water collecting pit to form a water collecting pit and water. In a sludge exhaust device of a refining furnace dust collector in which processing equipment is connected by a pipe via a sludge pump, a sludge discharge pipe is provided near the bottom of the water collection pit and connected to the sludge pump. Into a drainage system to the water treatment facility and a circulation system to the water collection pit. This is a direct sludge discharging device for a refining furnace dust collector provided with a sludge control unit for switching and controlling a control valve.

[0009] Further, the direct sludge discharging apparatus of the refining furnace dust collector includes a detection signal from a liquid level detector provided in a water collecting pit,
The apparatus is provided with a sludge control unit that compares preset liquid level levels, starts and stops the sludge pump, and outputs an alarm and an interlock signal for stopping the blowing to the refining furnace control device. Furthermore, the direct sludge removal device of this refining furnace dust collector compares a detection signal input from a flow rate detector provided in a cleaning water supply system of a primary dust catcher with each set value set in advance. Issue an alarm and
A sludge control unit is provided for switching the control valve from the sludge system to the circulation system and outputting an interlock signal for stopping the blowing to the refining furnace controller.

[0010]

In the present invention, during blowing of the refining furnace, dust-containing wastewater is drawn out by a sludge pump through a sludge discharge pipe provided near the bottom of the water collecting pit, and the control valve of the sludge system is opened. Close the control valve of the circulating system and discharge the sludge directly to the water treatment facility.Also, while the smelting furnace is not blowing, close the control valve of the sludge system and open the control valve of the circulating system. Dust-containing wastewater can be circulated to the collection pit. Therefore, during blowing, clean water from which dust has been removed from the water treatment facility is always supplied to the cleaning nozzle of the primary dust catcher and falls into the water collecting pit, thereby preventing dust from accumulating at the lower part of the pit. In addition, during non-blowing, dust-containing waste water is extracted from the vicinity of the bottom of the water collection pit with a mud pump and circulated to the water collection pit.
The inside of the water collecting pit is agitated by the circulating drainage, and the accumulation of dust is prevented.

In addition, in this invention, during the blowing, the sludge is discharged directly from the bottom of the collecting pit to the water treatment facility by the sludge pump. The water drain of the primary dust catcher's water seal duct, which does not occur with the method of sending wastewater overflowing from the water pit to the water treatment equipment, occurs, air enters the primary dust catcher, reacts with CO in exhaust gas and explodes Danger is considered. However, the sludge control unit compares the detection signal from the liquid level detector provided in the water collection pit with a preset liquid level, starts and stops the sludge pump, and issues an alarm and a refining furnace control device. Outputs an interlock signal to stop blowing. Alternatively, the sludge control unit compares the detection signal input from the flow rate detector provided in the cleaning water supply system of the primary dust catcher with a preset set value, and issues an alarm if the set value is equal to or less than the set value. The control valve switching control is performed from the sludge system to the circulation system, and an interlock signal for stopping the blowing is output to the refining furnace control device. Therefore,
The occurrence of water breakage in the water seal duct of the primary dust catcher in the water collection pit is prevented.

Further, in the present invention, since the wastewater containing dust is extracted from the water collecting pit and circulated to the water collecting pit during the non-blowing of the refining furnace, the supply of the washing water to the primary dust catcher can be stopped. Compared with the conventional method in which the wastewater overflowing from the water collecting pit is always discharged to the water treatment facility even during the non-blowing, the supply amount of the washing water can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to FIGS. FIG. 1 is an overall explanatory view of the direct exhaust system of the refining furnace dust collector according to the present invention, FIG. 2 is a flow chart of control valve switching and cleaning water supply monitoring control during blowing and non-blowing according to the present invention, and FIG. 4 is a flowchart of the water level control of the water collecting pit according to the present invention. In FIG. 1, reference numeral 1 denotes a converter, and 3 denotes a skirt provided between a furnace opening of the converter 1 and a flue 2.
In order to prevent the converter exhaust gas from burning, the intrusion of air from the furnace mouth is cut off and introduced into the primary dust catcher 4, and clean water from which dust is separated by a water treatment facility (not shown) is passed through a cleaning water supply pipe 5. The gas is sprayed from the spray nozzle 6 to wash and remove dust in the exhaust gas, and the exhaust gas is guided to a secondary dust collector (not shown) by the conduit 7.

The wastewater containing dust discharged from the primary dust catcher 4 falls into a water collecting pit 9 through a lower water seal duct 8. Reference numeral 10 denotes a drainage pipe for dust-containing wastewater that has fallen into the water collecting pit 9, and the dust-containing wastewater is extracted from the vicinity of the bottom of the water collecting pit 9 by a sludge pump 11. Dust-containing wastewater extracted by the sludge pump 11 is delivered to a water treatment facility (not shown) by a pipe 12 when the converter 1 is blowing, and is collected by a pipe 13 when the converter 1 is not blowing. The pipes 12 and 13 are provided with control valves 14 and 15, respectively, so as to circulate through the pipes.

Reference numeral 16 denotes a liquid level detector for detecting the liquid level of the water collecting pit 9, and the liquid level of the water collecting pit 9 detected by the liquid level detector 16 is input to a sludge control unit 17. . Further, a flow rate detector 18 is provided in the cleaning water supply pipe 5,
Primary dust catcher 4 detected by flow detector 18
The supply amount of washing water to the drainage control unit 17 is input. Further, a signal indicating that the converter 1 is blowing or not blowing is input from the converter control device 19 to the sludge control unit 17. In addition, 20
Is an alarm.

As shown in FIG. 2, when a signal during the blowing of the converter 1 is input from the converter control unit 19, the sludge control unit 17 controls a control valve (not shown) provided in the washing water supply pipe 5. When the cleaning water supply amount input from the flow rate detector 18 is
In the case of 0 Ton / Hr or more, the control valve 15 is closed and the control valve 14 is opened, and the pipe 12 is closed from near the bottom of the water collecting pit 9.
Wastewater containing dust is discharged directly to the water treatment facility via
Further, the sludge control unit 17 sends the converter 1
When the non-blown signal is input, the control valve 15 is opened and the control valve 14 is closed, the control valve (not shown) provided in the washing water supply pipe 5 is closed, and the water collecting pit 9 contains dust. The wastewater is circulated to stir the inside of the water collecting pit 9 to prevent accumulation of dust.

Further, as shown in FIG. 3, the sludge control unit 17 detects a detection signal from the liquid level detector 16 provided in the water collecting pit 9 and outputs a predetermined liquid level H to a low liquid level. comparing the 4 stages set liquid level to the L _3, if the liquid level is at a high level H or higher, it activates the waste sludge pump 11, if the lower L ₁ or more than H, Hydraulic pumps 11
The stops and outputs an alarm issued signal to alarm 20 to be a lower L ₂ than L _1, the drops further to a lower L ₃ than L _2, and outputs an interlock signal blowing stop to the converter control unit 19 The configuration is as follows.

Further, as shown in FIG. 2, the sludge control unit 17 is provided with a signal during the blowing of the converter 1 inputted from the converter control unit 19 and a washing water supply amount inputted from the flow rate detector 18. When the supply amount of cleaning water becomes 130 Ton / Hr or less, an alarm issuing signal is output to the alarm device 20, and when the supply amount of cleaning water becomes 110 Ton / Hr or less, the control valve 1
4 is closed and the control valve 15 is opened, and the direct discharge of the dust-containing wastewater from the water collecting pit 9 to the water treatment equipment is stopped and circulated. Further, when the supply amount of the washing water is reduced to 100 Ton / Hr or less. , An interlock signal to stop blowing is output to the converter controller 19, and conversely, the supply amount of washing water is 130 To
When it recovers to n / Hr or more, it returns to the original state.

As described above, during the blowing of the converter 1, clean water is always supplied from the water treatment apparatus to the spray nozzle 6 through the cleaning water supply pipe 5, as shown in FIG. The dust in the exhaust gas of No. 1 is washed and removed. The dust-containing wastewater falls into the water collecting pit 9 via the water sealing duct 8, and from the vicinity of the bottom of the water collecting pit 9, is discharged from a pipe 12 by a mud pump 11.
Is discharged directly to the water treatment facility via Therefore, in the water collecting pit 9, since the dust-containing wastewater falls through the water sealing duct 8, the accumulation of dust on the bottom is prevented. During the non-blowing of the converter 1, the control valve 14 is closed and the control valve 15 is opened, and the supply of the washing water is stopped to circulate the dust-containing wastewater to the water collecting pit 9 and stir. The accumulation of dust on the bottom of the water collecting pit 9 is prevented.

Further, since the waste water containing dust is extracted from the vicinity of the bottom of the water collecting pit 9 and is directly discharged to the water treatment facility by the discharge pump 11, when the supply amount of washing water is reduced or the discharge pump 11 is abnormal, When the water seal duct 8 is cut off, air may enter the conduit 7 and react with CO in the exhaust gas to cause an explosion. However, a detection signal from the liquid level detector 16 provided in the water collecting pit 9 is input to the sludge control unit 17, and as shown in FIG.
L ₃ ), when the respective set levels are reached, the start, stop, and alarm of the sludge pump 11 or the converter controller 19
To output a blowing stop signal. Further, when the supply amount of the washing water decreases, the detection signal from the flow rate detector 18 is sent to the sludge control unit 1.
7 and compared with a predetermined set flow rate, as shown in FIG. 2, an alarm, switching of a control valve from a sludge system to a circulation system for dust-containing wastewater, or a blowing stop signal to a converter controller 19. Is output. Therefore, the water seal duct 8 in the water collecting pit 9 can be prevented from being water-sealed, or even if a water-seam break occurs, the blowing of the converter 1 is stopped beforehand. , Explosion and the like can be prevented.

[0021]

[Effect of the invention] As described above, according to the invention,
Dust accumulation of dust-containing exhaust gas generated from the smelting furnace can be prevented from collecting in the water collecting pit of the dust catcher. Cutting can be prevented, and a manual draining operation of dust collected at the bottom of the water collecting pit can be eliminated.

[Brief description of the drawings]

FIG. 1 is an overall explanatory view of a direct sludge discharging device of a smelting furnace dust collector of the present invention.

FIG. 2 is a flow chart of control valve switching and cleaning water supply amount monitoring control during blowing and non-blowing according to the present invention.

FIG. 3 is a flowchart of a water collecting pit liquid level control of the present invention.

FIG. 4 is an overall explanatory view of a conventional sludge discharging device of a smelting furnace dust collector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Converter 2, 32 Flue 3 Skirt 4, 33 Primary dust catcher 5, 34 Washing water supply pipe 6 Spray nozzle 7, 39 Conduit 8, 35 Water sealing duct 9, 36 Water collecting pit 10 Extraction pipe 11, 38 Drainage Pumps 12, 13 Piping 14, 15 Control valve 16 Liquid level detector 17 Drainage control unit 18 Flow rate detector 19 Converter control device 20 Alarm 31 Refining furnace 37 Overflow tank

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Morio Inoue 1850 Minato, Wakayama-shi, Wakayama Sumitomo Metal Industries, Ltd. Wakayama Works (72) Inventor Sumio Higashi 2-25 Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries Co., Ltd. Company Tokyo Design Office (56) References JP-A-58-1556312 (JP, A) JP-A-60-262912 (JP, A) JP-A-3-174205 (JP, A) JP, B2)

Claims (3)

(57) [Scope of request for utility model registration] 1. A smelting furnace and a primary dust catcher having a built-in washing nozzle are connected by a flue, a water sealing duct below the primary dust catcher is immersed below a liquid level of a water collecting pit, and a water collecting pit and water treatment equipment are installed. In the sludge discharge device of the refining furnace dust collector connected by piping through a sludge pump, a sludge discharge pipe is provided near the bottom of the water collection pit, connected to the sludge pump, and the discharge side of the sludge pump is treated with water. Control valves are provided separately for the sludge system to the equipment and the circulation system to the water collection pit, and control valves are provided for the sludge system or the circulation system during blowing or non-blowing in the refining furnace. A direct sludge discharge device for a refining furnace dust collector provided with a sludge control unit for switching control. 2. A detection signal from a liquid level detector provided in a water collecting pit is compared with a preset liquid level, and a sludge pump is started and stopped, and an alarm is sent to a refining furnace control device. 2. The direct sludge discharging device for a smelting furnace dust collector according to claim 1, further comprising a sludge control unit for outputting an interlock signal for stopping the smelting. 3. A detection signal input from a flow rate detector provided in a washing water supply system of a primary dust catcher is compared with a preset set value. 3. A direct sludge discharge device for a smelting furnace dust collector according to claim 1, further comprising a sludge control section for switching control of a control valve from the system to the circulation system and outputting an interlock signal for stopping the blowing to the smelting furnace control device.