JP2023104624A - Wet extinguishing method for coke - Google Patents

Abstract

To provide a wet extinguishing method for coke capable of reducing a moisture content of coke discharged from a wharf while completely extinguishing red-hot coke.SOLUTION: Watering after taking coke out of a kiln is divided into the watering for fire extinguishing equipment (primary watering) and the watering for a wharf (secondary watering), an amount of the watering (primary watering) at the fire extinguishing equipment is adjusted so that a coke temperature immediately after discharging to the wharf is equal to or higher than a minimum limit discharge temperature, a top of the wharf is partitioned into virtual partitions, and a total amount of water of the watering is reduced by watering (secondary watering) in each section on the wharf where the coke temperature exceeds an upper limit discharge temperature.SELECTED DRAWING: None

Description

The present invention relates to a wet fire extinguishing method for red hot coke after carbonization in the coke production process.

Coke is obtained by carbonizing coal in a coke oven at a high temperature of about 1200°C. After carbonization, the coke is removed from the coke oven in a red-hot state above about 1000° C., extinguished, and cooled to a temperature that allows it to be transported on a belt conveyor. Coke fire extinguishing methods are roughly divided into dry fire extinguishing methods and wet fire extinguishing methods.

In the dry fire extinguishing method, an inert gas (cooling gas) such as nitrogen gas is sprayed on red-hot coke to extinguish and cool the red-hot coke. High-temperature gas is obtained by exchanging the sensible heat of coke with cooling gas, and this gas is used to generate steam in an exhaust heat recovery boiler or the like, and energy is recovered by electric power or the like. This is an exhaust heat recovery technique called so-called CDQ (Coke Dry Quenching). At present, the dry fire extinguishing method using this CDQ is the mainstream because of its large energy-saving effect and environmental consideration.

On the other hand, the wet fire-extinguishing method is still used as a fire-extinguishing method for coke ovens without CDQ equipment or during repair of CDQ equipment. In the wet fire extinguishing method, water is sprinkled on red hot coke after carbonization to extinguish and cool it. Red-hot coke (about 1,200°C) taken out from the coke oven is placed in a truck called a fire extinguisher, transported to a fire extinguishing tower, and extinguished by water spraying. Fire extinguishing and cooled coke (around 400 to 600°C) is transported to the wharf in the fire extinguishing vehicle, and the coke is discharged from the fire extinguishing vehicle onto the wharf. do. If red-hot coke is found on the wharf that cannot be completely extinguished by spraying water on the fire tower, sprinkle water on the wharf to completely extinguish the fire. In this way, wet fire extinguishing is aimed at eliminating red-hot coke by spraying water and cooling the coke to a temperature at which the belt conveyor does not erode.

Coke is used in large amounts in the steelmaking process for iron ore reduction. However, in the ironmaking process, the amount of water brought into the blast furnace is strictly controlled. If a large amount of water is brought into the blast furnace, the heat in the blast furnace is consumed by the water, and the thermal efficiency in the blast furnace is significantly deteriorated. For example, when moisture evaporates, it takes heat from the blast furnace, and heat (decomposition heat) is consumed when the evaporated moisture decomposes into hydrogen (H ₂ ) and oxygen (O ₂ ) in the blast furnace. In addition, since the reduction reaction of iron ore by the generated hydrogen is an endothermic reaction, not only is the amount of heat taken away, but also the generated oxygen (O ₂ ) converts carbon monoxide (CO) in the furnace into carbon dioxide (CO ₂ ). Therefore, the reduction reaction by CO, which is originally an exothermic reaction, is suppressed. For these reasons, bringing water into the blast furnace destroys the heat balance in the blast furnace, so the water content of coke must be reduced as much as possible.

Several proposals have been made to meet the demand for wet coke extinguishing methods.
For example, in Patent Document 1, the traveling direction of the fire extinguishing vehicle is divided into three sections, and the amount of water sprayed on both end sections is about 1/2 of the amount of water sprayed on the central portion, so that coke is discharged to the wharf after cooling with water. A wet fire extinguishing method has been proposed for extinguishing red hot coke while maintaining a temperature of 60 to 400°C.

Patent Document 2 proposes to measure the temperature distribution and layer height distribution of the coke in the fire extinguishing vehicle immediately before the wharf is discharged after cooling with water, and to adjust the watering conditions in the fire tower at the time of the next kiln discharge based on this. It is

In Patent Document 3, a plurality of wreckage compartments are set on the wharf, and one lot of coke that has been watered in the kiln out of this time is discharged to one wreckage compartment on the wharf and stored. In addition to making it dry, the temperature of the stored coke in the storage compartment is measured prior to the next kiln release, and the average or maximum temperature value, or the average or maximum temperature gradient value is detected, and the detection The temperature value and temperature gradient value set in advance are compared with the preset fire limit temperature value and limit temperature gradient value. It has been proposed to temporally control the amount of water sprinkled on fire towers during venting.

Japanese Unexamined Patent Application Publication No. 2017-025146 JP-A-2006-241370 JP-A-5-320656

Coke is produced by carbonizing coal in a coke chamber, but the state of the coke chamber and the carbonization conditions (heat distribution, etc.) in the coke chamber are not constant, and vary from chamber to chamber and from time to time. , The properties of coke (size, shape, temperature) and the state of deposition on the fire extinguishing car differ for each batch of coke discharged from the kiln. That is, the conditions change for each kiln-out batch.

The technology proposed in Patent Document 1 may lead to a reduction in the amount of water sprinkled on the fire tower, but it does not necessarily completely extinguish the red-hot coke. If the red-hot coke remains, spraying water is required to extinguish it, and there remains a concern that it will not lead to total coke moisture control.

The technology proposed in Patent Document 2 is a technology for feeding back information on the state of coke in the fire extinguishing car in the previous batch of coke to the next batch of coke, but as described above, for each batch of coke out of the kiln. Since the temperature of coke and the state of deposition on the fire extinguisher differ, it is not always possible to perform accurate control based on information from the previous batch. Furthermore, since the fire extinguisher is mounted in a heaped state, it is not possible to properly grasp the internal condition only from the surface temperature distribution and layer height distribution.

The technology proposed in Patent Document 3 tries to control the water sprinkling amount by feeding back the coke state information on the wharf of the previous batch to the next batch, but this is not necessarily accurate with the previous batch information. control is not possible.

As described above, in the prior art, in coke cooling by sprinkling, it is proposed to feed back the information of the previous batch discharged from the kiln to the next batch discharged from the kiln. Since it is different for each kiln-out batch, accurate control cannot be achieved by feedback of the information of the previous batch. This is especially noticeable in older furnaces. Therefore, accurate fire extinguishing cooling control has not been performed conventionally, and it is not known whether the moisture content of the coke discharged from the wharf is reduced.

Accordingly, an object of the present invention is to completely extinguish the red-hot coke while reducing the moisture content of the coke discharged from the wharf in the wet extinguishing of coke.

In order to solve the above problems, the present inventors reexamined the on-site operation and obtained the following findings.

(a) Red-hot coke that could not be extinguished by sprinkling water on the fire tower and could be discharged to the wharf was mostly coke in large chunks. In other words, because it is a large mass, even if the surface layer is extinguished, the inside is smoldering with fire. Furthermore, since the coke is extinguished by spraying water while it is mounted in a heap on the fire extinguisher, the coke on the surface is extinguished excessively, but the water spray does not reach the coke embedded inside, especially the large coke, and the water is extinguished accurately. Fire may not be extinguished. When discharged to the wharf, it is scattered widely over the wharf, so it is thought that the unextinguished coke inside and the broken coke from the large coke come into contact with the air and become red-hot coke. Therefore, red-hot coke on the wharf exists locally.

(b) The amount of water sprayed on the fire tower is basically set so that red-hot coke does not form on the wharf, in other words, the water spray on the fire tower can completely extinguish the fire. Therefore, there is a possibility that the amount of water sprayed is excessive for coke other than bulk coke.

(C) As an example, when investigating the cooling tendency of coke on a certain wharf, coke with a temperature of 600 ° C or higher immediately after being discharged to the wharf (hereinafter sometimes referred to as "warf discharge temperature") It was found that even after 30 minutes on the wharf, the belt conveyor heat resistance control temperature (about 200°C) or higher was reached. There is a risk of inducing equipment failure of the belt conveyor if the belt conveyor is used as it is.

On the other hand, if the wharf discharge temperature is 400°C or less, after 20 minutes on the wharf, the moisture evaporation lower limit temperature (lower limit temperature for coke moisture evaporation: about 60°C) may not be reached, and the coke moisture content may not be reduced. It turns out that there is

Coke cooling trends on these wharves change depending on coke oven equipment, wharf shape, and environmental conditions (including natural environments such as geographic environment and seasonality). For this reason, it was found that the wharf discharge temperature of coke has a minimum discharge temperature, which is the lower limit of the discharge temperature, and an upper limit discharge temperature, which is the upper limit of the discharge temperature, depending on the conditions of the coke oven.

(d) From these findings, the watering after coke is discharged from the kiln is divided into watering in the fire extinguishing equipment (primary watering) and watering in the wharf (secondary watering), and the coke temperature immediately after being discharged to the wharf is equal to or higher than the lower discharge temperature. Adjust the amount of water sprayed by the fire extinguishing equipment (primary water spray) so that It was found that by sprinkling water, it is possible to prevent equipment failure of the belt conveyor while suppressing the total amount of water sprinkled.

The present invention is based on the above findings, and the gist thereof is as follows.
[1]
In a wet coke fire extinguishing method in which the coke discharged from the coking chamber is sprinkled with fire extinguishing equipment and then discharged to the wharf, the wharf is divided into a plurality of sections, and the coke temperature when discharged for each section is measured, Water is sprinkled by the fire extinguishing equipment so that the measured coke temperature is equal to or higher than the predetermined lower limit discharge temperature, and the measured coke temperature exceeds the predetermined upper limit discharge temperature. Coke characterized by sprinkling water. wet fire extinguishing method.
[2]
The wet fire extinguishing method for coke according to [1], wherein the minimum dispensing temperature is 400°C.
[3]
The wet coke fire extinguishing method according to [1] or [2], wherein the upper discharge temperature is 600°C.
[4]
The wet fire extinguishing method for coke according to any one of [1] to [3], wherein the temperature is measured with a non-contact thermometer.
[5]
In a coke oven having a fire extinguishing equipment and a wharf, the wharf is divided into a plurality of compartments, temperature measuring means for measuring the coke temperature in the compartments, a wharf watering means having a watering surface according to the compartments, and the temperature A wet cooling system for coke, comprising control means for controlling the wharf water sprinkling means and the water sprinkling means of the fire extinguishing equipment based on the coke temperature measured by the measuring means.
[6]
The wet coke cooling apparatus according to [5], wherein each of the compartments has the temperature measuring means and the water sprinkling means.
[7]
The wet cooling device for coke according to [5], wherein the temperature measuring means and the water sprinkling means are integrated and movable to any location on the wharf.
[8]
The wet coke cooling device according to any one of [5] to [7], wherein the temperature measuring means is a non-contact thermometer.

ADVANTAGE OF THE INVENTION This invention is effective in preventing the equipment failure of a belt conveyor, suppressing coke moisture content.

FIG. 1 shows a conceptual diagram of a coke production facility. FIG. 2 is a conceptual diagram showing an example of division by looking down on the wharf from above in the direction perpendicular to the wharf plane. FIG. 3 is a schematic diagram of a method for extinguishing coke in a wharf according to an embodiment of the present invention.

The present invention will be described with reference to the drawings. The figures show one embodiment of the invention, and the invention is not limited to this embodiment.

[Conventional coke production method]
First, the general method of coke production will be described.
FIG. 1 shows an example of a coke production facility. A coke oven 1 mainly has coking chambers 2 arranged in a horizontal row, and coke 3 is produced by carbonizing coal charged in the coking chambers. The dry-distilled coke is in a red-hot state of about 1200° C. and is also called red-hot coke. The coke 3 dry-distilled in the coke chamber is extruded from one side of the coke chamber by an extruder (not shown) and discharged into a fire extinguishing vehicle (truck) 4 (this is called discharge from the kiln).

The coke 3 discharged by the fire extinguishing vehicle 4 is transported into the fire extinguishing equipment 5 by the fire extinguishing vehicle. The fire extinguishing equipment 5 has a watering equipment 6, and water 7 is sprinkled from the watering equipment 6 to extinguish and cool the red-hot coke 3 in the fire extinguishing vehicle 4. - 特許庁The amount of water 7 sprinkled from the sprinkler system 6 is sufficient to completely extinguish the red-hot coke.

The coke 3 extinguished and cooled by the fire extinguishing equipment 5 is transported to the wharf 10 while being mounted on the fire extinguishing vehicle 4. - 特許庁The wharf 10 has an inclined flat plate shape, and the coke 3 is discharged from the fire extinguishing vehicle 4 to the wharf 10 by opening the wharf-side side plate of the fire extinguishing vehicle or tilting the fire extinguishing vehicle. The coke 3 discharged onto the wharf 10 scatters and accumulates on the wharf according to the slope of the wharf. The coke 3 is left in this state for a certain period of time (approximately several tens of minutes), and cooled to a temperature below which equipment failure such as melting of the belt conveyor does not occur. Basically, it is cooled by natural dissipation cooling. Equipment failures of belt conveyors are mainly due to melting damage of the belt due to coke, and since the heat resistance temperature (surface temperature) of the high temperature belt of the belt conveyor is about 200 ° C, 200 ° C. should be managed as the belt conveyor heat resistance control temperature. .

The cooled coke 3 is transferred to a belt conveyor 8 and transported to a storage (not shown) or the like. In the case of an ironmaking process, after being transported to a storage once, the required amount is cut, transported to a blast furnace (not shown), and charged into the blast furnace. As described above, it is desirable that the water content of the coke is as low as possible, and in particular, the water content of the coke charged into the blast furnace should be 8.0% or less. Preferably, it is controlled to be 7.0% or less, 6.0% or less, 5.0% or less, 4.0% or less, or 3.0% or less.

[Coke wet extinguishing method according to the present invention]
<Wharf section>
The wharf 10 is divided into a plurality of compartments 11 of arbitrary size. FIG. 2 is a conceptual diagram showing an example of the section 11 when the wharf 10 is viewed from above in the direction perpendicular to the wharf plane. The wharf 10 is divided by the dotted lines in FIG. 2 into individual sections. In the case of FIG. 2, it is divided into 42 sections, 7 horizontally and 6 vertically.

Warfs do not have to be physically partitioned, they just need to be partitioned virtually. That is, instead of partitioning the wharf with fences or partitions, it is sufficient to partition the wharf by invisible demarcation lines. The coke 3 discharged from the fire extinguisher accumulates along the slope of the wharf 10 . At this time, the sensible heat of the coke 3 is easily dissipated into the atmosphere because the coke 3 is spread thinly and widely compared to the thickness of the coke loaded in the fire extinguisher. It is left in this state for a predetermined time and cooled.

<Coke temperature measurement in compartment>
The coke temperature is measured for each compartment 11 in FIG. For temperature control, it is desirable to measure the temperature immediately after dispensing. If possible, the measurement should be performed within 3 minutes, preferably within 2 minutes, and more preferably within 1 minute after dispensing. The measurement method is not particularly limited. Since the coke immediately after being discharged to the wharf usually has a temperature of around 500° C., it is desirable to measure it without contact. As long as it is non-contact temperature measurement, the method is not particularly limited, such as radiant infrared measurement or thermography.

The temperature of the coke in each section 11 of the wharf is measured as the deposited coke surface temperature. One or more temperature measurements are taken for each compartment. When multiple points are measured, the average temperature may be taken as the coke temperature of the section. When the temperature is measured at one point in the compartment, that point may be used as the representative point for the coke temperature in the compartment. If there is coke only in part of the compartment, the temperature of only the part with coke should be measured.

<Discharge lower limit temperature>
As described above, the coke temperature immediately after being discharged to the wharf is preferably equal to or higher than the minimum discharge temperature. This is because, if coke is discharged to the wharf at a temperature lower than the minimum discharge temperature, it may reach the minimum vaporization temperature when it is cooled on the wharf and discharged to the belt conveyor. The lower limit temperature for evaporation is the lower limit temperature required for the moisture contained in coke to evaporate. If the temperature is below the lower limit temperature for evaporation, the water contained in the coke will not evaporate, resulting in an increase in the amount of water brought into the blast furnace, which is inconvenient for blast furnace operation. Therefore, the amount of water sprayed (primary water spray) in the fire extinguishing equipment is adjusted so that the discharge temperature at the wharf is equal to or higher than the minimum discharge temperature.
The inventors have empirically confirmed that the lowest evaporation temperature is about 60°C. Therefore, the minimum dispensing temperature is preferably 60°C, preferably 61°C, 62°C, 63°C, 64°C or 65°C.

According to experiments conducted by the inventors, in the case of a general coke oven, when the coke discharge temperature to the wharf is 400° C., the coke temperature becomes 60° C. or less when left to cool on the wharf for 20 minutes. Therefore, the lowest discharge temperature of the wharf discharge temperature should be 400°C, preferably 410°C, 420°C or 430°C. However, since this left cooling depends on the environment of the wharf and the length of time it can be left on the wharf, it is preferable to set the lowest discharge temperature according to the wharf equipment.

There is no particular limitation on the method for adjusting the amount of water sprinkled by the fire extinguishing equipment so that the wharf discharge temperature is equal to or higher than the minimum discharge temperature. For example, the primary watering amount for the next coke batch is determined from the amount of water sprayed (primary watering) in the fire extinguishing equipment and the wharf discharge temperature for the immediately preceding coke batch from the kiln. If the wharf discharge temperature is below the minimum discharge temperature, the amount of primary watering is increased, and if the minimum discharge temperature +5°C or higher, the amount of primary watering is decreased.

Alternatively, in view of batch-to-batch variation, it is conceivable to control the primary water spray amount for the next batch from the kiln based on the average value of the primary water spray amount and the average value of the wharf discharge temperature in the previous multiple batches from the kiln.

<Discharge upper limit temperature>
As described above, the coke wharf discharge temperature is preferably equal to or lower than the upper limit discharge temperature. If the coke is discharged to the wharf at a temperature higher than the upper discharge limit temperature, even if it is cooled on the wharf, it may exceed the heat resistance control temperature of the belt conveyor when discharged to the belt conveyor, which causes equipment failure of the belt conveyor. It is from. The heat-resistant temperature (surface temperature) of the high-temperature belt of the belt conveyor is about 180 to 200° C. (eg, HC710, HC1500 manufactured by Bando Co., Ltd.). Therefore, the belt conveyor heat resistance control temperature should be set to 200°C.

In the experiments of the inventors, in the case of a general coke oven, when the coke wharf discharge temperature is 600 ° C or higher, even if it is left to cool on the wharf for 30 minutes, the coke temperature will be below the belt conveyor heat resistance control temperature of 200 ° C. I knew it wouldn't. Therefore, the upper limit of the wharf discharge temperature should be 600°C, preferably 590°C, 580°C or 570°C. However, since this standing cooling changes depending on the environment of the wharf and the length of time it is left on the wharf, it is preferable to set the maximum discharge temperature according to the wharf equipment.

<Secondary watering>
As a result of measuring the coke temperature in each section, if the wharf discharge temperature of coke exceeds the upper limit temperature of discharge, water is sprinkled in that section (secondary watering) in order to lower the coke temperature in that section below the upper limit temperature of discharge. good. In other words, by spraying water only on the coke in the compartments exceeding the upper limit temperature of discharge, instead of spraying all over the coke, unnecessary watering can be avoided and the amount of watering can be reduced. As a result, the coke content can be reduced.

[Coke production equipment according to the present invention]
Next, a coke production apparatus according to one embodiment of the present invention will be described.

<Temperature measurement means>
The temperature measuring means is not particularly limited as described above, but is preferably a non-contact temperature measuring means. For example, there are infrared radiation thermometers and thermoviewers.
The temperature measuring means are arranged so that one or more points can be measured in each section. For example, one or more may be installed in one section. When one temperature measuring means is installed in one section, it is preferable that the temperature measuring means be arranged so as to be able to swing so that one temperature measuring means can measure the temperature at a plurality of points in the section. For example, a thermoviewer may be used as the temperature measuring means, and a plurality of sections may be collectively measured by the thermoviewer.

When a plurality of temperature measuring means are arranged, they should be arranged so that the temperature can be measured at a plurality of points within the compartment. Of course, even when a plurality of temperature measuring means are arranged, each temperature measuring means may be oscillated, and each may have a structure capable of measuring temperatures at a plurality of points. The mounting means of the temperature measuring means is not particularly limited.

Further, for example, the temperature measuring means may be structured so that the entire wharf can be observed with one temperature measuring means. For example, by fixing one temperature measuring means in the space above the wharf and making the temperature measuring means swingable, the coke temperature in which section of the wharf can be measured from the position information to which the temperature measuring means is facing. The coke temperature of the section can be calculated from the temperature measured at one or more points in the section.

Alternatively, for example, a thermoviewer may be used as the temperature measuring means, and the measurement range of the thermoviewer may be defined as one section, and the coke temperature of the section may be calculated. That is, one pixel of the thermoviewer can be set as the minimum block unit.

For example, the temperature measuring means may be arranged so as to be movable in space above the wharf. For example, the temperature measurement means mounted on the drone may be moved in the space above the wharf, or the temperature measurement means may be mounted on the tip of the arm. Based on the positional information of the temperature measuring means and the information on the direction in which it is facing, identify which section of the wharf the coke temperature is being measured, and calculate the coke temperature of the section from the measured temperature at one or more points in that section. can do.

<Wharf watering (secondary watering) means>
Watering (secondary watering) means at the wharf is not particularly limited, and for example, watering nozzles are preferable. There are many types of watering nozzles such as cone type and elliptical type, but there is no particular limitation. From the viewpoint of uniform watering, a cone-shaped watering nozzle is preferable.

The amount of water to be sprayed may be appropriately determined based on the size of the compartment, the number of nozzles in the compartment, and the wharf state (installation angle, environment, etc.).

One or a plurality of sprinkler means may be arranged for each section. For example, one or more can be installed in one section. When installing one watering means in one section, the watering means should preferably cover the entire surface of the section. When arranging a plurality of watering means in one section, the watering means should be arranged so that the amount of water sprayed is as uniform as possible within the section. If the amount of water sprayed in the compartment is uneven, excessive water is sprayed and the water content of the coke increases. As a result, coke that exceeds the heat resistance control temperature of the belt conveyor is obtained.

The watering means may be arranged so that one watering means can water a plurality of compartments. For example, one water spraying means may be arranged in a space above the wharf so as to be able to swing so that water can be sprayed on a plurality of sections. Further, for example, a water spraying means may be mounted on the tip of the arm so that water can be sprayed on a plurality of compartments. In such a case, we can identify which section of the wharf is being watered from the position information and swing angle information of the watering means, and control the watering amount and, depending on the case, the watering pressure from the distance and angle to that section. , it should be possible to sprinkle water over the entire area.

When the temperature measuring means is a thermoviewer, a portion in the compartment where the temperature exceeds the maximum dispensing temperature may be specified, and water may be sprinkled from the water sprinkling means corresponding to that portion based on the positional information.

<Integrated structure of temperature measurement means and water sprinkling means>
For example, the temperature measuring means and the water sprinkling means may be integrated. An integrated structure means that the temperature measuring means and the water sprinkling means acting on the same section are installed as one structure. By making the integrated temperature measurement means and water sprinkling means movable to any place on the wharf, water can be sprinkled only on the minimum necessary parts (parts where the coke temperature exceeds the upper limit temperature for dispensation). , the amount of water sprayed can be suppressed.

For example, a temperature measuring means and a water sprinkling means are mounted on the tip of the arm, and when the coke temperature measured by the temperature measuring means exceeds the upper discharge temperature, a predetermined amount of water is sprinkled from the integrally structured water sprinkling means. can be done. In this case, the range of one measurement by the temperature measuring means can be set as the minimum section, and when the coke temperature exceeds the upper limit discharge temperature in this minimum section, water can be sprinkled to extinguish and cool the coke. In other words, by scanning the wharf with such integrated temperature measuring means and water sprinkling means, it is possible to sprinkle water only on the necessary portion (the portion exceeding the upper discharge temperature limit) of the entire coke on the wharf. It is possible to minimize the amount of watering as a result.

An example will be described. The inventors compared the amount of water sprinkled with and before the application of the present invention, and the moisture content of coke, based on the operational performance of the same coke oven with the same amount of coke discharged. The maximum discharge temperature, minimum discharge temperature, belt conveyor heat resistance control temperature, and minimum evaporation temperature were set as follows.
Discharge upper limit temperature: 600°C
Minimum dispensing temperature: 400°C
Belt conveyor heat resistance control temperature: 200℃
Evaporation lower limit temperature: 60°C
Wharf section division: 6 divisions were made so as to have the same area.
Temperature measurement means: Infrared thermography (commercially available, with laser pointer)
Temperature measurement method: The temperatures at 5 points in each section were manually measured from the side of the wharf, and the average temperature was taken as the section temperature.
Secondary watering means: Cone type watering nozzle
Secondary watering method: Place four watering nozzles on each section so that the watering surface covers the entire area of the section Primary watering amount: Evaluated by watering time (seconds) because the flow rate is constant Secondary watering amount: Watering because the flow rate is constant Evaluate in time (seconds)
However, the amount of secondary watering (per section) was set to 5% of the amount of primary watering.
Watering for fire extinguishing equipment (primary watering): controlled by watering time with a watering timer (constant flow rate)

FIG. 3 shows a schematic diagram of the coke extinguishing method at the wharf in the example. In FIG. 3, the wharf 10 is divided into six compartments by imaginary lines (broken lines in the drawing), and the wharf watering means is installed in each compartment.
A hand-held temperature measuring means (infrared thermography) 12 was used, and the measurement position was specified by a laser pointer 13 from the side of the wharf, and the coke temperature of each section was measured. Note that the temperature measuring means may be installed in a structure or device. Although the temperature distribution within the measurement range can be measured in one measurement, the highest temperature within the measurement range was taken as the coke temperature in that measurement range. In this way, arbitrary 5 points were measured in the same section, and the average temperature was taken as the coke temperature of the section. The coke temperature of this section is transmitted to the control means (not shown), and based on this coke temperature, the control means controls the water spraying (primary watering) means and the wharf watering (secondary watering) means of the fire extinguishing equipment. made it
FIG. 3 shows only two wharf watering means (watering nozzles) 14 in the lower right section of the wharf in order to schematically show them. The upward watering surface was made to cover the entire plot.
When the coke temperature in the section exceeds the upper limit temperature of discharge (600° C.), the control means controls so that water 15 is sprayed from the wharf water spraying means (watering nozzle) 14 . At this time, a watering time of 5 seconds or 10 seconds was previously input to the control means.

Moisture content in coke: Coke (sample) delivered from the wharf to the belt conveyor was collected, dried in an infrared heating furnace, and the moisture content in coke was measured. The water content in coke is obtained by the following formula.
Water content in coke (%) = {Sample weight after sampling (g) - Sample weight after drying (g)} / {Sample weight after sampling (g)} × 100
In the comparative example (conventional example), when red-hot coke was visually found on the wharf, water was poured (sprayed) using a commercially available water injection hose to extinguish the fire instead of secondary watering. The flow rate at this time was about twice the amount of water sprayed to one section in the example of the present invention.

Table 1 shows the measurement results. As can be seen from Table 1, it was confirmed that according to the present invention, no red-hot coke was generated when discharged from the wharf to the belt conveyor, and the water content in the coke was reduced.

The present invention can be used in coke production. In particular, it can be used as coke for steelmaking raw materials.

1 coke oven 2 carbonization chamber 3 coke 4 fire engine 5 fire extinguishing equipment 6 watering (primary watering) means 7 watering (primary watering)
8 belt conveyor 10 wharf 11 compartment 12 temperature measuring means (infrared thermography)
13 laser pointer 14 Wharf watering means (spray nozzle)
15 Watering

Claims (8)

In the wet fire extinguishing method of coke, in which the coke discharged from the coking chamber is sprinkled with water by the fire extinguishing equipment and then discharged to the wharf,
Divide the wharf into a plurality of sections, measure the coke temperature when discharged for each section,
Sprinkle water with the fire extinguishing equipment so that the measured coke temperature is equal to or higher than the predetermined lower limit discharge temperature,
A wet fire extinguishing method for coke, characterized in that water is sprayed in the compartment where the measured coke temperature exceeds a predetermined upper limit temperature for dispensing. The wet coke fire extinguishing method according to claim 1, wherein the lower discharge temperature limit is 400°C. 3. The wet coke fire extinguishing method according to claim 1 or 2, wherein the upper discharge temperature is 600°C. The wet coke extinguishing method according to any one of claims 1 to 3, wherein the temperature is measured with a non-contact thermometer. In a coke oven with fire extinguishing equipment and wharf,
temperature measuring means for dividing the wharf into a plurality of compartments and measuring the coke temperature in the compartments; wharf watering means having a watering surface corresponding to the compartments;
A wet cooling system for coke, comprising control means for controlling the wharf water spraying means and the water spraying means of the fire extinguishing equipment based on the coke temperature measured by the temperature measuring means. 6. A wet cooling system for coke according to claim 5, comprising said temperature measuring means and said watering means for each of said compartments. 6. A wet coke cooling system according to claim 5, wherein said temperature measuring means and said watering means are integral and movable to any location on said wharf. A wet coke cooling apparatus according to any one of claims 5 to 7, wherein said temperature measuring means is a non-contact thermometer.

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