JPH06287563A - Apparatus for controlling coke moisture - Google Patents

Abstract

PURPOSE:To reduce the cost of a dust collector incidental to a dry quenching apparatus and prevent adverse effects on blast furnace operations following a quenching step. CONSTITUTION:A dry-quenched and cooled coke 20 conveyed by belt conveyors 311 to 31n is sprayed with water from a water spray nozzle 41 to prevent dusting from the coke 20. The water content of the coke is kept constant by controlling the amt. of water sprayed on the basis of coke wt., coke temp. before and after water spraying, dust and water contents of coke after water spraying, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary device for a coke dry-type fire extinguishing facility for extinguishing and cooling and recovering heat of red-hot coke by exchanging heat with inert gas. The present invention relates to a coke humidity control device that produces controlled humidity coke by performing controlled watering on the coke.

[0002]

2. Description of the Related Art Recent extinction of red-hot coke has become mainstream by dry fire extinguishing, which can effectively utilize the enormous amount of heat of red-hot coke, improve the quality of coke, and reduce the problem of dust pollution. Figure 1 shows a dry fire extinguishing system for red hot coke.

The red hot coke 10 of about 1000 ° C. which has been carbonized in a coke oven is a bucket 1 loaded on a fire engine 11.
2 receives it and carries it to a dry fire extinguisher 13 called a cooling tower. Red-hot coke 10 charged into dry fire extinguisher 13
Is heat-exchanged with the inert gas 14 and cooled to near 200 ° C., and then cut out from the lower gate 15. on the other hand,
The inert gas 14 is exchanged with the red hot coke 10 by 8
It is heated to near 00 ° C and sent to the boiler 16. The inert gas 14 whose heat is recovered by the boiler 16 is sent to the dry fire extinguisher 13 by the circulation fan 17, and the red hot coke 1
Used for heat exchange with zero.

The fire-extinguishing coke 20 cut out from the lower gate 15 after the fire-extinguishing cooling is a belt conveyor 21.
Transported to the blast furnace. Further, the dust generated from the fire extinguisher cooling coke 20 being conveyed is collected by the dry dust collector 22.

[0005]

Unlike the coke cooled and extinguished by the conventional water sprinkling cooling equipment, the coke dried and extinguished in the dry coke dry extinguishing equipment has extremely high dryness and a large amount of fine coke. Is attached. Therefore, much dust is generated from the belt conveyor and the like, and it is difficult to collect dust by a wet dust collector that is inexpensive in terms of equipment, and an expensive dry dust collector is used.

[0006] Incidentally, water spraying is a general method for suppressing dust generation from a conveyed product conveyed by a belt conveyor, and this is actually carried out for powder and granular materials such as coal, ore, limestone, etc. (Kaisho 52-77372, etc.). However, sprinkling water for the purpose of suppressing dust generation has not been carried out on coke cooled and extinguished by dry fire extinguishing equipment. This is considered to be because there is no idea of adding water to the fire-cooled coke because the extinguishment is premised on the dry type, and even if water is sprinkled, there is a concern that it may adversely affect the operation of the blast furnace.

Therefore, as described above, a large amount of dust is generated from the fire extinguishing coke during conveyance of the conveyor, and a large dry dust collector is installed, which requires a great deal of cost for environmental measures.

The object of the present invention is to control the humidity of the fire-extinguishing cooling coke discharged from the dry fire-extinguishing tower and conveyed, thereby suppressing the cost required for dust collection and, at the same time, adversely affecting the operation of the blast furnace. It is intended to provide a coke humidity control device capable of suppressing.

[0009]

DISCLOSURE OF THE INVENTION A coke humidity control apparatus of the present invention comprises a water spray nozzle for spraying water on a fire extinguisher cooling coke discharged from a dry fire extinguisher tower of a coke dry fire extinguisher and conveyed by a conveyor, and a fire extinguishing cooler. A detector for obtaining an index for determining the amount of water sprinkled from the coke, and a controller for controlling the amount of water sprinkling based on the index for determining the amount of water sprinkling obtained from the fire extinguisher cooling coke in order to manage the amount of water in the fire extinguisher cooling coke. It is equipped with.

At least one of the weight of coke, the temperature of coke before and after watering, the concentration of dust after watering, and the water content of coke after watering can be used as an index for determining the amount of watering obtained from the fire-extinguishing coke.

[0011]

[Operation] When water is sprayed on the dry fire extinguishing cooling coke, dust generation from the fire extinguishing cooling coke is suppressed,
On the other hand, there is a concern that the fire extinguishing cooling coke that has been sprayed will contain water and adversely affect the operation of the blast furnace. But,
According to the investigation of the present inventor, even if water is sprinkled, the moisture contained in the fire-extinguishing coke is small, and if the amount of water is stable and has little fluctuation, the influence on the blast furnace operation is extremely small, and It was found that even with such water sprinkling, dust emission from the fire-extinguishing coke was significantly suppressed, and an inexpensive wet dust collector was sufficient.

The coke humidity control apparatus of the present invention sprinkles water on the fire extinguishing cooling coke carried by the conveyor,
Moreover, the amount of water in the fire-extinguishing coke is controlled by controlling the amount of water sprinkled based on the index for determining the amount of water-spraying obtained from the fire-extinguishing cooling coke. The cost can be suppressed and the adverse effect on the operation of the blast furnace can be suppressed as much as possible.

Coke weight, coke temperature before and after water spraying, coke dust concentration after water spraying, and water content of coke after water spraying are effective indicators for determining the amount of water sprayed for the following reasons.

1) Coke weight The weight of coke weighed on a conveyor scale,
Since it is the amount of coke to be humidity-controlled, it serves as a powerful index for determining the amount of water spray.

2) Coke temperature before and after water spraying The coke temperature before and after water spraying is measured with a radiation thermometer or the like. Since the coke temperature decreases due to water sprinkling, the coke temperature is a powerful index for determining the amount of water sprinkling. Since a part of the moisture that has been sprinkled in the humidity condition evaporates into the air due to the sensible heat of the coke, it is desirable to adjust the sprinkling amount at the temperature before and after the sprinkling. Also,
It is also a powerful index for predicting water evaporation.

3) Dust Concentration After Water Sprinkling Since dust generation is suppressed by water sprinkling, the dust concentration after water sprinkling is also a powerful index for determining the amount of water sprinkling. Furthermore, coke that has once been conditioned and whose dust generation has been suppressed may recur dust due to surface drying during transportation.From this point as well, it is possible to measure the dust-containing concentration after watering and adjust the amount of water sprinkled. desirable. In addition, the dust concentration meter is generally susceptible to the influence of water vapor, and since it is intended to monitor the reoccurring dust due to re-drying, at least on the downstream conveyor where the generation of water vapor has ended, or on the downstream conveyor. It is recommended to install it in the dust collection suction pipe or the exhaust pipe of the dust collector.

4) Water content of coke after sprinkling The water content of the humidity-controlled coke is an index that greatly affects the amount of dust generated from the coke and the operation of the blast furnace in the subsequent process. That is, the amount of dust generated from the coke is suppressed as the water content becomes higher, and the smaller the water content becomes, the smaller the adverse effect on the blast furnace operation becomes.

By controlling at least one of these indicators in combination to control the amount of water spray in determining the amount of water spray,
It is possible to produce a humidity-controlled coke that suppresses dust generation and minimizes adverse effects on the operation of the blast furnace in the subsequent process.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a system diagram showing the structure of an example of a coke humidity control apparatus embodying the present invention.

In the present embodiment, a fire extinguisher cooling coke 20 cut out from the dry fire extinguisher tower of the coke dry extinguishing equipment shown in FIG. 1 is installed in a blast furnace by a coke conveying device 30 in which a plurality of belt conveyors 31 _{1 to} 31 _n are connected in series. Be transported to. The fire extinguisher cooling coke 20 being conveyed is subjected to humidity control processing by the coke humidity control device 40. In addition, dust generated from the fire extinguisher cooling coke 20 after humidity control is collected by the dust collector 50. The dust collector 50 uses a wet dust collector 51. The wet dust collector 51 is connected via a suction pipe 53 to a dust collection hood 52 provided at a downstream transfer section of the conveyor.

The coke humidity control apparatus 40 has a water spray nozzle 41 provided on the upstream conveyor. Water for spraying is supplied to the water spray nozzle 41 through a water supply pipe 42. In the water supply pipe 42, a solenoid valve 43a connected to the water sprinkling control unit 45,
43b and a flow meter 44 are provided.

The sprinkling control unit 45 controls the opening of the solenoid valve 43a so that the flow rate given by the flow meter 44 becomes the target flow rate, and the sprinkling amount from the sprinkling nozzle 41 matches the determined sprinkling amount. Let The other solenoid valve 43b is set to the maximum flow rate so that a large amount of water is not sprinkled.

As an index for determining the amount of water sprayed, the coke humidity controller 40 uses the weight of coke, the temperature of coke before and after water spraying, the water content of coke after water spraying, and the concentration of dust after water spraying.

The weight of coke is detected by a weighing machine 46 attached to the watering conveyor. The coke temperature before and after watering is detected by thermometers 47a and 47b provided on the upstream side and the downstream side of the water spray nozzle 41. The water content of the coke after watering is detected by a water content meter 48 installed on the conveyor. The dust-containing concentration after water sprinkling is detected by dust-containing concentration meters 49a and 49b provided on the inlet side (in the suction pipe 53) and the outlet side (in the stack) of the wet dust collector 51.

The detected coke weight, coke humidity before and after water sprinkling, coke water content after water sprinkling, and dust concentration after water sprinkling are given to the water sprinkling controller 45. The watering controller 45
Using these given indicators, the amount of watering necessary for the production of humidity-controlled coke containing appropriate moisture is set. The appropriate water content is a stable water content that suppresses dust generation from the fire-extinguishing coke 20 as much as possible and does not significantly increase heat loss in the furnace during blast furnace operation. Then, the determined sprinkling amount is realized by controlling the opening degree of the solenoid valve 43a, as described above.

In the present embodiment, water is sprayed by the water spray nozzle 41 on the fire extinguishing cooling coke 20 which is conveyed by the conveyor after the dry fire extinguishing is completed, upstream of the conveying path. Further, dust collection by the wet dust collector 51 is performed downstream of the transport path.

The fire extinguisher cooling coke 20 that has been sprayed with water has a constant amount of water in the coke, which is controlled by controlling the amount of water sprayed as described above. Therefore, dust generation from the fire-extinguishing coke 20 is sufficiently suppressed, and sufficient dust collection is performed without any practical problems, even though the dust collector 40 uses the inexpensive wet dust collector 41.

Moisture contained in the fire-extinguishing coke 20 increases heat loss in the furnace during blast furnace operation. However, since the water content is small and the water content is controlled to be constant, the heat balance in the furnace is reduced. It is stable and has little effect on blast furnace operation. Therefore, a humidity-controlled coke is produced which has a minimum adverse effect on the operation of the blast furnace.

FIG. 3 is a table showing the relationship between the amount of water sprayed and the dust-containing concentration on the outlet side of the wet dust collector when water is sprayed on the fire-fighting cooling coke discharged from the fire-fighting cooling tower and conveyed.
The black circles are for a coke transport amount of 2T / 40sec, and the white circles are for a coke transport amount of 2T / 50sec.
The number in parentheses is the water content (% by weight) in the coke immediately after watering. Coke temperature is 134 ° C on average due to watering
To 59 ° C.

The following can be seen from FIG. Since the dust concentration decreases with water sprinkling, the dust concentration is a powerful index for determining the amount of water sprinkling. The amount of coke immediately after sprinkling is different between the case where the amount of coke is large and the case where the amount of coke is small. Therefore, the amount of coke, that is, the coke weight, is also a powerful index for determining the amount of sprinkle. Since the water content of coke immediately after watering changes depending on the amount of water sprayed regardless of whether the amount of coke transported is large or small, the water content of coke water immediately after watering is also a powerful index for determining the water spray amount. Further, as described above, since the coke temperature is lowered by water sprinkling, the coke temperature after water sprinkling is also a powerful index for determining the water sprinkling amount.

FIG. 4 shows the relationship between the sprinkling amount when the sprinkling amount is controlled by using all of these indexes and the moisture value of the coke immediately after the sprinkling, in comparison with the case of no control. .

The non-control means that the amount of water spray is simply changed without using the index for determining the amount of water spray. In this case, even if the amount of water sprinkled is the same, the water content of coke varies greatly depending on the weight of coke, the temperature of coke, the fluctuation of water supply pressure, and the loading condition on the conveyor, and a strong correlation cannot be established between the amount of water sprinkled and the water content of coke. Therefore, the coke water content is not controlled to the target value even if the sprinkling amount is changed. However,
When the sprinkling amount is controlled using the index for determining the sprinkling amount, a strong correlation is established between the sprinkling amount and the coke water content, and the coke water content is managed at the target value.

FIG. 5 is a graph showing the relationship between the moisture value of coke and the dust-containing concentration. The dust-containing concentration is measured on the inlet side and the outlet side of the wet dust collector (Rotocron). By sprinkling water on the coke, dust generation from the coke is dramatically suppressed, and the dust concentration on the dust collection outlet side falls to a value that does not pose a practical problem, making it possible to use an inexpensive wet dust collector. .

The coke humidity control apparatus of the present invention can be applied not only to dry fire-extinguishing coke but also to a conveyor-conveyed object such as wet fire-extinguishing coke or sinter, which may cause dust scattering.

[0036]

As described above, the coke humidity control apparatus of the present invention sprays dry fire extinguishing cooling coke with water, and controls the amount of water sprayed to manage the amount of water in the coke. As a result, it is possible to suppress the dust generation from the fire extinguishing coke during transportation while minimizing the adverse effect on the operation of the blast furnace, and to significantly reduce the cost of the dust collector.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of coke dry fire extinguishing equipment.

FIG. 2 is a system diagram showing the configuration of an example of the coke humidity control apparatus of the present invention.

FIG. 3 is a graph showing the effectiveness of an index for determining the amount of water spray.

FIG. 4 is a graph showing the effectiveness of water spray amount control using an index for determining the water spray amount.

FIG. 5 is a graph showing the effect of coke moisture on dust collection.

[Explanation of symbols]

 10 red hot coke 13 dry digestion tower 20 extinguishing cooling coke 22 dry dust collector 30 coke transport device 40 coke humidity control device 41 sprinkling nozzle 45 water sprinkling control unit 46 weigher 47a, 47b thermometer 48 moisture meter 48a, 48b dust concentration meter 50 collector Dust device 51 Wet dust collector

Claims (2)

[Claims] 1. A sprinkling nozzle for sprinkling water on a fire-extinguishing cooling coke discharged from a dry-type extinguishing tower of a coke dry-type extinguishing system and conveyed by a conveyor, and a detector for obtaining an index for determining the amount of water sprinkling from the fire-extinguishing cooling coke. A coke dry fire extinguisher facility comprising: a controller for controlling the amount of water spray based on an index for determining the amount of water spray obtained from the fire extinguisher cooling coke in order to manage the amount of water in the fire extinguisher cooling coke. 2. The index for determining the amount of water spray obtained from the fire-extinguishing coke includes the weight of coke, the coke temperature before and after water sprinkling,
The coke dry fire extinguishing equipment according to claim 1, wherein the dry coke extinguishing equipment is at least one of a dust-containing concentration after watering and a water content of coke after watering.