JPH1172291A - Method of collecting dust in ore discharge part of sintering equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce quantity of dust sucked into a dust collector by spraying a mist to an ore discharge part in coincidence with production of the dust at the time of crush of sintered ore when a large amount of the dust produced at the time of crushing sintered ore of high temperature by a crusher is collected by a dust collector provided above the crusher in the ore discharge part of sintering equipment. SOLUTION: Lumps of sintered ore 1 falling from a pallet 2 for conveying the sintered ore 1 is crushed by a crusher 3. By this crushing a large volume of high temperature gas and dust are produced and temperature of an atmosphere starts rising. The temperature of the atmosphere rising due to production of the high temperature gas is detected by a thermometer 8 and when the temperature reaches a specified temperature, a mist is sprayed from a mist nozzle 7. As a result, the temperature of the atmosphere is lowered and the volume of the gas is reduced. A large amount of the dust sucked by a dust collection hood 5 is turned into pseudo-particulate matter and ascending speed of atmospheric gas flow is lowered so that most of the produced dust is made to precipitate and load of a dust collector 6 is lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of collecting dust from a sintering equipment ore, which is excellent in economical efficiency, and more particularly to a method of collecting a large amount of dust generated when crushing a sintered high-temperature sinter. It is a suggestion.

Generally, in a sintering facility, dust generated in a feeder, a mixing tank, a discharger, a conveyor, and the like is collected using an electric dust collector or the like. In this dust collection, the dust collection load is larger in the mining section than in the mining section and the mixing tank. In other words, in the mining section, since the red hot high-temperature sinter after sintering is crushed by a crusher, the mining section at the time of crushing the sinter is
The amount of generated dust is much larger than each of the above portions, and the amount of generated gas is also large, resulting in a high-temperature atmosphere, and the dust collection load becomes excessive.

[0003] Therefore, when the dust collecting capacity is insufficient when sintering ore is crushed, there is a problem that red smoke is discharged from a chimney discharged after electric dust collection, that is, dust is discharged into the atmosphere. An economical solution is desired.

[0004]

2. Description of the Related Art Regarding the dust collection technology of a mining section, for example,
Japanese Patent Application Laid-Open No. Hei 7-151472 (a method for collecting dust from sinter) has been proposed, in which compressed air is injected into the sinter from below the crusher to forcibly lift the dust generated during crushing. A method for improving the dust collecting effect is disclosed. This method
The dust from the mining section is efficiently guided to the dust collecting section to collect the dust.However, in order to prevent the large amount of dust generated during the crushing of the sintered ore into the atmosphere, a large amount of dust is required. It is necessary to increase the capacity of the dust collector according to the peak of the amount of generated dust, and there is a problem that the cost of the equipment is soared and the economic efficiency is poor.

[0005]

SUMMARY OF THE INVENTION The present invention advantageously solves the above-mentioned problems, and sucks a large amount of dust generated during crushing of a sintered ore in an ore-discharging section into a dust collector. An object of the present invention is to propose an effective and economical dust collection method for a sintering facility mining section without reducing the amount of dust and increasing the capacity of a dust collector.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted various studies to reduce the peak of dust and high-temperature gas generated when sintering is crushed, and found that spraying mist is extremely effective. And found the present invention. That is, the gist of the present invention is as follows.

[0007] In the sintering equipment mining section, when a large amount of dust generated when the sintered high-temperature sintered ore is crushed by the crusher is collected by a dust collector provided above the crusher,
A dust collection method for a sintering facility exhaust part, characterized by spraying mist onto the exhaust part in accordance with the generation of dust during sinter crushing (No. 1)
invention).

[0008] The dust collecting method for a sintering facility mining section according to the first invention, wherein the mist spraying is started when the atmospheric temperature of the mining section reaches a set value (second invention).

[0009] The dust collection method for a sintering facility discharge section according to the first or second invention, wherein the mist particle size is in the range of 50 to 200 µm (third invention).

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The function and effect of the present invention will be described below. As described above, in the sintering facility, the dust collection load in the mining part is larger than in other parts, and a large amount of dust and high-temperature gas are generated, especially when the red hot high-temperature sinter supplied in a specific cycle is crushed. At this time, the load of the dust collector becomes excessive,
Dust is emitted into the atmosphere, causing a problem.

Therefore, according to the present invention, a mist is sprayed to a mined portion in accordance with the generation of dust at the time of sintering ore crushing.

That is, when mist is sprayed into an atmosphere in which a large amount of dust and high-temperature gas are generated during sinter ore crushing, the temperature of the atmosphere gas is reduced and the volume thereof is reduced. As the ambient gas temperature decreases, the upward flow velocity of the ambient gas decreases, so that much of the dust settles down and the amount of dust sucked by the dust collector installed above decreases. The amount of dust sucked into the dust collector is reduced due to the pseudo-particle formation of the dust. Due to such effects, the load on the dust collector is reduced, and the discharge of dust to the atmosphere can be prevented. Much of the dust that has settled due to pseudo-particles is trapped by the crushed sinter, and is charged to the blast furnace as fine powder during sieving of the sinter or attached to the sinter, and Available as a source.

[0013] In addition, the start time of the mist spraying in accordance with the generation of dust during sinter ore crushing, since high-temperature gas is generated along with the generation of dust and the ambient temperature rises, the ambient temperature is used as an index. It is also possible to start mist spraying when the specific value is reached. That is, the atmosphere temperature of the mining section is measured, and the time when the atmosphere temperature reaches the set value may be set as the start time. Here, the set value of the ambient temperature may be determined according to the dust collecting function, for example, the amount of high-temperature dust and gas generated in large quantities when sintering ore is crushed in the mining part, and the dust collecting and air volume capability of the dust collector. If the amount of dust and gas generated exceeds the dust collection and air flow capacity, the mist spray can be used to reduce the gas volume associated with the decrease in ambient temperature, and the upper limit of the temperature corresponding to this reduced gas volume The mist spraying may be started when the ambient temperature reaches this set value.
On the other hand, crushing is performed by a crusher at this falling timing in accordance with the falling cycle of the sinter in the mining section, and at this time, high temperature gas is generated along with generation of dust, and the ambient temperature rises. Therefore, it is also possible to perform mist spraying in accordance with the falling timing to make pseudo particles of dust and to lower the ambient temperature.

The particle size of the mist to be sprayed is preferably small from the viewpoint of the cooling effect of the atmosphere gas and the like, but is preferably 50 μm or more from the viewpoint of cost. Since cooling can be performed, the mist particle size is set to 50 μm or more and 200 μm or less.

[0015]

【Example】

Example 1 FIG. 1 is an explanatory view of a sintering equipment discharge section. In the figure, in the mining section of the sintering equipment, the sintered ore 1 immediately after sintering is transported in a red-hot state by a pallet 2, falls in a lump having substantially the same size as the pallet 2, and is crushed by a crusher 3. You. The crushed sintered ore is conveyed to the cooler 4 and secondarily crushed into a product.

On the other hand, since a large amount of dust is generated at the time of crushing of the sintered ore 1, a dust collecting hood 5 and a dust collector (electric dust collector) 6 are provided in the mining section. And all other dust collection stations and compounding tanks.

In order to carry out the present invention, a mist nozzle 7 for spraying mist and a thermometer 8 for measuring an ambient temperature are installed in the mining section.

Next, an embodiment performed using the equipment shown in FIG. 1 will be described below. Reference numeral 1 denotes a sintered ore, and a sintered ore 1
The sinter ore 1 in the form of a block on which the pallet 2 for transporting the sinter falls is crushed by the crusher 3. Due to this crushing, a large amount of high-temperature gas and dust are generated, and the atmospheric temperature starts to rise. The temperature of the atmosphere rising due to the generation of the high-temperature gas is detected by the thermometer 8,
When the temperature reached 500 ° C., a mist having a particle size of 200 μm was sprayed from the mist nozzle 7 at a spray amount of 8 t / h. In this example, the set ambient temperature at the start of mist spraying was 500 ° C., and the set ambient temperature at the stop of mist spraying was 200 ° C.

As a result, naturally, the ambient temperature
Reduced from 500 ℃ to 200 ℃, the gas volume is 40%
Diminished. The large amount of dust that has been sucked up by the dust collecting hood 5 is converted into pseudo particles, and the generated dust is combined with the decrease in the ambient gas temperature and the accompanying decrease in the gas flow rate due to the decrease in the gas volume. Most of the dust settled and the load on the dust collector was reduced, so that no dust was exhausted from the chimney.

Embodiment 2 Next, another embodiment performed using the equipment shown in FIG. 1 will be described below. This is dust collection at the mine sintering section of the sintering facility where the pallet 2 for conveying the sinter 1 is transported at a speed of 2.5 m / min and the pallet length is 1.5 m. Under these conditions, the sinter has a falling cycle of 36 seconds / times, and is crushed by the crusher 3 in this cycle. A large amount of dust and high-temperature gas are generated by this crushing, and the ambient temperature becomes high. However, the amount of generation reaches a peak about 10 seconds from the start of crushing. That is, about 10 every 36 seconds
High temperature and high dust for a second. In the present invention, mist spraying is preferably performed for at least about 10 seconds in accordance with the falling cycle of the sintered ore, and mist spraying is performed only under the high temperature and high dust conditions. Sinter 1 is pallet 2
The mist spraying was started from the time when the mist sprayer dropped from the crusher 3 and reached the crusher 3, and the mist spraying was repeated at a cycle of 36 seconds with the mist spraying continuation time being 12 seconds to collect dust. A mist nozzle having a mist particle diameter of 100 μm and a spray amount of 10 t / h was used for mist spraying. As a result, the rise in the ambient temperature was limited to 250 ° C., the remarkable increase in the gas volume was suppressed, and no dust was discharged into the atmosphere.

The amount of dust gas discharged from the mining section is about 1/4 of the total amount provided by the dust collector, but as described above, the amount of dust collected from this section during crushing of the sintered ore is reduced. Effect was confirmed.

On the other hand, the moisture in the atmospheric gas due to the mist spray increases water dew condensation on the wall of the ore-mining section. However, the water increase is about 8% and the dew temperature is about 50 ° C. On the other hand, since the wall steel temperature was 70 ° C. or more, there was no problem.

[0023]

According to the present invention, mist is sprayed when sintering high-temperature sintered ore in the sintering equipment discharge section. According to the present invention, a large amount of mist is sprayed during sintering ore crushing. The load on the dust collector due to the generated dust and high-temperature gas can be reduced, and the dust can be prevented from being discharged into the atmosphere economically and effectively.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a sintering facility discharge section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sinter ore 2 Pallet 3 Crusher 4 Cooler 5 Dust collection hood 6 Dust collector 7 Mist nozzle 8 Thermometer

Claims (3)

[Claims] 1. A large amount of dust generated when a sintered high-temperature sinter is crushed by a crusher in a sintering facility ore discharging section, and when a dust collector collects a large amount of dust, A dust collection method for a sintering facility, wherein mist is sprayed to the mine in accordance with the generation of dust. 2. The method according to claim 1, wherein the mist spraying is started when the ambient temperature of the mining section reaches a set value.
2. A dust collection method for a sintering facility mining section according to item 1. 3. The method of claim 1, wherein the mist particle size is in the range of 50 to 200 μm.