JPH06271861A - Method for suppressing dust generation from dry-quenched coke - Google Patents

Abstract

PURPOSE:To suppress the generation of dust from coke under transportation at a low cost by collecting powder dust generating from dry-quenched coke during transportation with a belt conveyor, measuring the content of dust and controlling the amount of spraying water to keep the dust content in the dust-collection gas below a prescribed level. CONSTITUTION:Dry-quenched coke quenched in a dry-quenching facility is transferred with belt conveyors 1, 3, 4. The dust generated from the dry-quenched coke 7 under transportation is collected with dust-collection hoods 5, 6 and sucked with a blower 9 through a suction pipe 8. The amount of dust in the dust-collection gas is measured by a dust-content sensor 12 such as a dust concentration measuring instrument attached to the suction pipe 8. The dust content data of the dust-collection gas is outputted to a water spray controlling part 13. Water extracted from a water tank 14 with a pump 15 is passed through a pipe 16 and sprayed from a spray nozzle 2. The dust content in the dust-collection gas is kept below a prescribed level by controlling the amount of water to be sprayed from the spray nozzle based on the dust content of the dust-collection gas, water-content of coke and the relationship between the water content of coke and the amount of sprayed water. The dust generation during the transportation of dry-quenched coke can be suppressed by this process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for suppressing dust generation during transportation of a dry fire-extinguished coke which has been cooled and extinguished in a coke dry-extinguishing equipment.

[0002]

2. Description of the Related Art Conventionally, the extinction of red-hot coke that has been carbonized in a coke oven has mainly been a wet extinguishing system in which a fire extinguisher is loaded on a fire extinguisher and cooled by spraying water from the upper part of the fire extinguisher tower.
The enormous amount of heat that the red-hot coke possesses is wasted, and the coke dust is scattered around by the water vapor that is generated when the water is extinguished, causing dust pollution. For this reason, recent fire extinguishing of red-hot coke has become mainstream by dry-type fire extinguishing by a coke dry-type fire extinguishing equipment which can recover enormous amount of heat of the red-hot coke and prevent dust pollution at the time of fire extinguishing.

Since the dry fire-extinguishing coke cooled in the above-mentioned coke dry-extinguishing equipment is cooled by heat exchange with the circulating inert gas, fine coke is adhering to the dry fire extinguishing coke and is being conveyed by the belt conveyor. Dust from the coke becomes a problem. The amount of dust generated during dry fire extinguishing coke transportation is large and the particle size of the dust itself is very small. Therefore, in order to collect this dust, the required control wind speed becomes high and it is necessary to increase the suction air volume for dust collection. . Such a large-scale increase in suction air volume for dust collection not only increases the size of the dust collector,
It is necessary to significantly increase capital investment, such as increasing the diameter of the suction pipe.

As a method for preventing dust from scattering from a conveyed object by means of a belt conveyor, conventionally, generally, the open portion is reduced or the suction air velocity is increased by increasing the suction air amount for dust collection. Allowed (JP-A-54-
118063 gazette) and the like have been taken. Also,
A method for suppressing dust generation by performing watering on the granular material being conveyed by a belt conveyor (for example, Japanese Patent Laid-Open No. 52-
No. 77372, etc.) has been generally adopted from the past.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The method disclosed in Japanese Patent No. 8063 has a limit even if the number of openings is reduced, and in order to increase the amount of suction air for dust collection, the diameter of the dust collection pipe is increased and the processing capacity of the dust collector is increased. It is inevitable that the amount of capital investment will increase significantly. In addition, the method disclosed in JP-A-52-77372,
It is necessary to adjust the amount of water sprinkled in proportion to the amount of coke transported, and if the adjustment is insufficient, the water content of coke after sprinkling will rise significantly, and this will hinder the operation of the blast furnace in the subsequent process.
There is a problem that it is necessary to continuously measure the water content of the coke, and a large amount of equipment investment is required for the continuous measurement of the coke water content.

An object of the present invention is to provide a method for suppressing dust generation in dry fire-extinguishing coke, which can reduce dust generation during conveyance of dry-cooling coke without significantly increasing capital investment.

[0007]

Means for Solving the Problems The inventors of the present invention have repeatedly conducted tests and studies on the relationship between the water content of coke and the dust content in the suction gas of the belt connecting portion in order to achieve the above object. As a result, as shown in FIG. 2, when the water content of the coke is 3% or less, the amount of dust generated from the coke rises sharply.
When the relationship between the amount of water sprayed on the dry fire-extinguishing coke and the water content of the coke at a temperature of 180 ° C. was investigated, it was found that there was a strong correlation as shown in FIG. 3, and the present invention was reached.

That is, the present invention relates to a method for suppressing dust generation of dry fire-extinguishing coke which is sprayed on dry fire-extinguishing coke while being conveyed by a belt conveyor. The amount of dust is measured, and based on the relationship between the dust content in the dust collecting gas and the coke moisture, and the relationship between the coke moisture and the sprinkling amount, a dry fire extinguishing coke so that the dust content in the dust collecting gas becomes a predetermined value or less. It is a method for suppressing dust generation in dry fire-extinguishing coke, which is characterized by controlling the amount of water sprayed to water.

[0009]

In this invention, the dust content in the dust collecting gas for sucking and removing the dust generated from the coke being conveyed is measured, and the dust content in the dust collecting gas and the coke moisture and the coke moisture and the sprinkling amount are measured. Based on the relationship with the above, since the amount of water sprayed to the dry fire-extinguishing coke is controlled so that the dust content in the dust collecting gas becomes a predetermined value or less, the coke moisture content of 3% or more, which drastically reduces the dust generation amount, is used. By controlling the amount of water sprayed to the dry fire-extinguishing coke so as to hold it, the amount of dust generation can be dramatically reduced. The measurement of the amount of dust generated from the coke during transportation in the present invention is performed by, for example, installing a soot concentration meter or a dust content sensor in the dust collecting pipe from the connecting portion of the belt conveyor, and the soot concentration in the collected gas. Alternatively, the dust content is continuously measured.

The amount of water sprayed to the dry fire-extinguishing coke is controlled by inputting the measurement results of the soot concentration meter or the dust content sensor to the water sprinkling control unit, and the dust containing gas in the dust collecting gas preset in the water sprinkling control unit. The amount of water sprayed to the dry-type fire-extinguishing coke is calculated from the relationship between the amount of coke and the amount of coke water and the relationship between the soot concentration in the dust collection gas or the amount of dust content and the amount of water sprinkling, and the amount of dust content in the gas collection is found to be below the specified value. Control to be.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to FIG. FIG. 1 is an overall explanatory view showing an example of a dust suppression device for dry fire-extinguishing coke for carrying out the method of the present invention. In FIG. 1, 1 is a belt conveyor for carrying out dry fire-extinguishing coke cut out from a coke dry fire-extinguishing equipment, 2 is a sprinkler nozzle provided above the belt conveyor 1 at a predetermined interval, and 3 and 4 are belt conveyors 1. Belt conveyor that sequentially conveys dry fire extinguishing coke from
Reference numerals 5 and 6 capture the dust generated from the dry fire-extinguishing coke 7 generated at the time of unloading, which is provided at the connecting portion from the belt conveyor 1 to the belt conveyor 3 and the connecting portion from the belt conveyor 3 to the belt conveyor 4. The dust captured by the dust collecting hoods 5 and 6 in the dust collecting hood is sucked by the blower 9 through the suction pipe 8 and the dust collector 10 such as a bag filter.
After being dusted by, it is released from the chimney 11 into the atmosphere.

Reference numeral 12 denotes a dust content sensor such as a dust concentration meter provided in the suction pipe 8. The dust content in the dust collecting gas detected by the dust content sensor 12 is output to the water sprinkling control unit 13. 14
Is a water tank, and the water extracted by the pump 15 from the water tank 14 is sprayed from the water spray nozzle 2 through the pipe 16. Reference numeral 17 is a flow control valve provided in the pipe 16, 18 is a flow meter, and the water spray amount detected by the flow meter 18 is output to the water spray controller 13. The water sprinkling control unit 13 measures the dust content in the dust collecting gas input from the dust content sensor 12 and the flowmeter 1.
Based on the relationship between the sprinkling amount input from No. 8, the dust content in the dust collecting gas and the coke moisture, and the coke moisture and the sprinkling amount input in advance, the dust content in the dust collecting gas is a predetermined value. It is configured to calculate the amount of water sprayed as follows and control the flow rate control valve 17 to control the amount of water sprayed from the water spray nozzle 2. Reference numeral 19 is a water supply pipe, and 20 is a water spray nozzle provided above the belt conveyor 4.

With the above configuration, the dust content sensor 12 detects that the dust content in the dust collection gas captured by the dust collection hoods 5 and 6 has exceeded a predetermined value, and the water sprinkling control unit 13 is provided. Is input to the sprinkler control unit 13, the sprinkling amount input from the flow meter 18, the dust content in the dust collecting gas, the coke moisture, and the relationship between the coke moisture and the sprinkling amount that are input in advance. Then, the amount of water sprinkled so that the amount of dust contained in the dust collecting gas is equal to or less than a predetermined value is calculated, and the flow rate control valve 17 is controlled so that the amount of water sprinkled from the water sprinkling nozzle 2 becomes the calculated amount of water sprinkled. Therefore, the dust generated from the dry fire-extinguishing coke 7 is controlled so that the dust content in the dust collecting gas is always less than or equal to a predetermined value, so that the dust emission from the dry fire-extinguishing coke 7 in the conveying process is reduced. be able to.

The belt conveyor 1 to the dust collecting hood 6
If the dry fire extinguishing coke 7 is sprinkled with water in consideration of the time lag while the dry fire extinguishing coke 7 is conveyed, dust generation from the dry fire extinguishing coke 7 can be further reduced. Further, the belt conveyors 1, 3, 4 are
It goes without saying that it is covered with a dustproof cover.

[0015]

As described above, according to the method of the present invention, the amount of dust generated during the transfer of dry fire-extinguished coke extinguished by the coke dry-extinguishing equipment can be dramatically reduced without investing a large amount of equipment. You can

[Brief description of drawings]

FIG. 1 is an overall explanatory view showing an example of a dust-prevention device for a dry fire-extinguishing coke for carrying out the method of the present invention.

FIG. 2 is a graph showing the relationship between the water content of coke and the dust content in the collected gas.

FIG. 3 is a graph showing the relationship between the amount of water sprayed on coke and the water content of coke.

[Explanation of symbols]

 1,3,4 Belt conveyor 2,20 Water sprinkling nozzle 5,6 Dust collecting hood 7 Dry fire extinguishing coke 8 Suction tube 9 Blower 10 Dust collector 11 Chimney 12 Dust content sensor 13 Water sprinkling control unit 14 Water tank 15 Pump 16 Piping 17 Flow rate adjustment Valve 18 Flowmeter 19 Water supply pipe

Claims (1)

[Claims] 1. A method for suppressing dust generation of dry fire-extinguishing coke sprinkling water on dry fire-extinguishing coke while being conveyed by a belt conveyor, wherein the amount of dust contained in dust collecting gas for sucking and removing dust generated from dry fire-extinguishing coke while being conveyed. Based on the relationship between the dust content in the dust collecting gas and the coke water content and the coke water content and the water sprinkling amount, the dry fire extinguishing coke was sprayed so that the dust content in the dust collecting gas became a predetermined value or less. A method for suppressing dust generation in dry fire-extinguishing coke, which comprises controlling the amount of water.