Wet extinguishing method for coke

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

Technical Field

[0001] The present invention relates to a method for wet extinguishing of red-hot coke after carbonization in the process of manufacturing coke.

Background Art

[0002] Coke is obtained by carbonizing coal at a high temperature of about 1200°C in a coke oven. After the carbonized coke is taken out of the coke oven in a red-hot state exceeding about 1000°C, it is extinguished and cooled to a temperature at which it can be transported by a belt conveyor. The methods for extinguishing coke are roughly classified into a dry extinguishing method and a wet extinguishing method.

[0003] [[ID=I5]] The dry extinguishing method is to spray an inert gas (cooling gas) such as nitrogen gas onto the red-hot coke to extinguish and cool the red-hot coke. High-temperature gas is obtained by heat-exchanging the sensible heat of the coke with the cooling gas, and steam is generated using this gas in an exhaust heat recovery boiler or the like, and energy is recovered in the form of electric power or the like. This is a heat recovery technology called so-called CDQ (Coke Dry Quenching). Due to its large energy-saving effect and environmental consideration, the dry extinguishing method using this CDQ has become the mainstream at present.

[0004] On the other hand, the wet extinguishing method is still used as a method for extinguishing coke in a coke oven without CDQ equipment or during the repair period of CDQ equipment. The wet extinguishing method is to sprinkle water on the red-hot coke after carbonization to extinguish and cool it. The red-hot coke (about 1200°C) taken out from the coke oven is put into a trolley called a fire truck, transported to a fire tower, and extinguished and cooled by sprinkling water. The extinguished and cooled coke (about 400 to 600°C) is transferred to the wharf as it is in the fire truck, the coke is discharged from the fire truck onto the wharf, and left to cool until the temperature reaches a temperature (200°C or lower) at which the life of the belt conveyor is not significantly reduced. When red-hot coke that could not be completely extinguished by sprinkling water in the fire tower is found on the wharf, water is sprinkled on the wharf to completely extinguish it. Thus, the purpose of wet extinguishing is to eliminate red-hot coke by sprinkling water and cool the coke to a temperature at which the belt conveyor is not damaged by melting.

[0005] Coke is used in large quantities in the steelmaking process to reduce iron ore. However, the amount of moisture brought into the blast furnace is strictly controlled during the steelmaking process. If there is too much moisture brought into the blast furnace, the heat energy inside the furnace is consumed by the moisture, significantly worsening the thermal efficiency of the blast furnace. For example, when moisture evaporates, it takes heat away from the blast furnace, and when the evaporated moisture decomposes into hydrogen (H2) and oxygen (O2), heat energy (decomposition heat) is also consumed. Furthermore, the reduction reaction of iron ore by the generated hydrogen is an endothermic reaction, so even more heat energy is taken away. In addition, the generated oxygen (O2) converts carbon monoxide (CO) in the furnace into carbon dioxide (CO2), suppressing the reduction reaction by CO, which is an exothermic reaction. For these reasons, bringing moisture into the blast furnace disrupts the thermal balance inside the furnace, so the moisture content of the coke must be reduced as much as possible.

[0006] Several proposals have been made to address this demand for wet methods of extinguishing coke fires. For example, Patent Document 1 proposes a wet fire extinguishing method in which the direction of travel of the fire extinguishing vehicle is divided into three sections, and the amount of water sprayed to both ends is about half the amount of water sprayed to the central section, thereby extinguishing the red-hot coke while maintaining a coke discharge temperature of 60 to 400°C after water cooling.

[0007] Patent Document 2 proposes measuring the temperature distribution and layer height distribution of the coke inside the fire extinguishing vehicle immediately before discharge from the wharf after water cooling, and adjusting the water spraying conditions in the fire extinguishing tower for the next kiln discharge based on these measurements.

[0008] Patent Document 3 proposes setting up multiple sludge compartments on a wharf, discharging one lot of coke treated with water during the current kiln unloading into one of the sludge compartments on the wharf for storage, and prior to the next kiln unloading, measuring the temperature of the sludge coke in that compartment, detecting the average or maximum temperature value, or the temperature gradient value of the average or maximum temperature, comparing the detected temperature value or temperature gradient value with a preset residual limit temperature value or residual limit temperature gradient value, and controlling the amount of water sprayed in the fire extinguishing tower during the next kiln unloading based on the relationship between the required water spraying time and the moisture content of the product coke. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2017-025146 [Patent Document 2] Japanese Patent Publication No. 2006-241370 [Patent Document 3] Japanese Patent Application Publication No. 5-320656 [Overview of the Initiative] [Problems that the invention aims to solve]

[0010] Coke is produced by carbonizing coal in a carbonization chamber, but the conditions of the carbonization chamber and the carbonization conditions within it (such as heat distribution) are not constant. They vary from chamber to chamber, and even from time to time, resulting in different properties of coke (size, shape, temperature) and accumulation conditions on the fire extinguishing vehicle for each batch of coke removed from the kiln. In other words, the conditions change with each batch of coke removed from the kiln.

[0011] The technology proposed in Patent Document 1 may lead to a reduction in the amount of water sprayed in fire extinguishing towers, but it does not necessarily mean that the red-hot coke is completely extinguished. If red-hot coke remains, water will be needed to extinguish it, raising concerns that this will not lead to an overall reduction in coke moisture content.

[0012] The technology proposed in Patent Document 2 is a technique that feeds back information about the state of the coke inside the fire extinguishing vehicle from the previous batch of coke being removed from the oven to the next batch. However, as mentioned above, the temperature of the coke and the way it is piled up on the fire extinguishing vehicle differ for each batch of coke being removed from the oven, so accurate control cannot always be achieved using information from the previous batch. Furthermore, since the coke is piled high on the fire extinguishing vehicle, the internal state cannot be properly understood by looking only at the surface temperature distribution and layer height distribution.

[0013] The technology proposed in Patent Document 3 attempts to control the amount of water sprayed by feeding back information about the state of coke on the wharf of the previous batch to the next batch, but this does not necessarily allow for accurate control using information from the previous batch.

[0014] As described above, conventional technology proposes feeding back information from the previous batch of coke to the next batch during water spraying cooling. However, since the condition of the coke discharged from the carbonization chamber differs for each batch, accurate control cannot be achieved by feeding back information from the previous batch. This is particularly evident in older furnaces. Therefore, accurate fire extinguishing and cooling control has not been achieved conventionally, and it is unclear whether the moisture content of the coke discharged from the wharf has been reduced.

[0015] Therefore, the present invention aims to completely extinguish red-hot coke while reducing the moisture content of the coke discharged from the wharf during wet coke extinguishing. [Means for solving the problem]

[0016] To solve the above problems, the inventors re-examined on-site operations and obtained the following findings.

[0017] (a) Most of the red-hot coke that could not be extinguished by water spraying from the fire tower and could be discharged to the wharf consisted of large chunks of coke. In other words, it was found that because of their large size, even if the surface was extinguished, the inside remained smoldering. Furthermore, since the coke is extinguished with water while piled high in the fire extinguishing truck, the surface coke is excessively extinguished, but the coke embedded inside, especially the large chunks of coke, may not be properly extinguished because the water does not reach it. When discharged to the wharf, it is scattered widely on the wharf, so it is thought that the unextinguished coke inside and the broken pieces of the large chunks of coke come into contact with the air and become visible as red-hot coke. Therefore, red-hot coke exists locally on the wharf.

[0018] (i) The amount of water sprayed from the fire extinguishing tower is basically set so that red-hot coke does not appear on the wharf, that is, so that the fire can be completely extinguished by the water sprayed from the fire extinguishing tower. For this reason, the amount of water sprayed may be excessive for coke other than large lumps.

[0019] (c) As an example, when investigating the cooling trend of coke on a certain wharf, it was found that coke whose temperature immediately after discharge to the wharf (hereinafter sometimes referred to as "wharf discharge temperature") was 600°C or higher remained above the belt conveyor's heat resistance control temperature (approximately 200°C) even after 30 minutes on the wharf. Discharging it onto the belt conveyor in this state poses a risk of causing equipment failure in the belt conveyor.

[0020] On the other hand, it was found that if the wharf discharge temperature is 400°C or lower, after 20 minutes on the wharf, the temperature falls below the lower limit temperature for water evaporation (the lower limit temperature at which coke water evaporates: approximately 60°C), and the coke water content may not be reduced.

[0021] Depending on the coke oven equipment, the shape of the wharf, and environmental conditions (including natural environments such as geographical environment and seasonality), the coke cooling tendency on these wharves varies. Therefore, it was found that the discharging temperature of coke from the wharf has a lower discharging limit temperature that serves as the lower limit of the discharging temperature and an upper discharging limit temperature that serves as the upper limit of the discharging temperature depending on the conditions of the coke oven.

[0022] (E) From these findings, the watering of coke after discharging from the kiln is divided into watering in the fire extinguishing equipment (primary watering) and watering on the wharf (secondary watering). The amount of watering in the fire extinguishing equipment (primary watering) is adjusted so that the coke temperature immediately after discharging onto the wharf is above the lower discharging limit temperature. The wharf is divided into virtual sections, and watering (secondary watering) is performed on the sections where the coke temperature on the wharf exceeds the upper discharging limit temperature in each section. It has been found that it is possible to prevent equipment failures of the belt conveyor while suppressing the total amount of water for watering.

[0023] The present invention is based on the above findings, and the gist thereof is as follows. [1] In a wet fire extinguishing method for coke that is watered with a fire extinguishing equipment after being discharged from a carbonization chamber and then discharged onto a wharf, the wharf is divided into a plurality of sections, the coke temperature at the time of discharging is measured for each section, watering is performed with the fire extinguishing equipment so that the measured coke temperature is above a predetermined lower discharging limit temperature, and watering is performed on the section where the measured coke temperature exceeds a predetermined upper discharging limit temperature. A wet fire extinguishing method for coke, characterized by the above. [2] The wet fire extinguishing method for coke according to [1], wherein the lower discharging limit temperature is 400°C. [3] The wet fire extinguishing method for coke according to [1] or [2], wherein the upper discharging limit 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] A wet cooling device for coke in a coke oven having a fire extinguishing system and a wharf, characterized in that the wharf is divided into a plurality of compartments, the device includes a temperature measuring means for measuring the coke temperature in the compartments, a wharf watering means having a watering surface corresponding to the compartments, and a control means for controlling the wharf watering means and the watering means of the fire extinguishing system based on the coke temperature measured by the temperature measuring means. [6] A wet cooling apparatus for coke according to [5], having the temperature measuring means and the water spraying means for each of the compartments. [7] A wet cooling apparatus for coke according to [5], wherein the temperature measuring means and the water spraying means are integrated and movable to any location on the wharf. [8] A wet cooling apparatus for coke according to any one of [5] to [7], wherein the temperature measuring means is a non-contact thermometer. [Effects of the Invention]

[0024] This invention has the effect of suppressing the moisture content of coke while preventing equipment failure of the belt conveyor. [Brief explanation of the drawing]

[0025] [Figure 1] Figure 1 shows a conceptual diagram of a coke production facility. [Figure 2] Figure 2 is a conceptual diagram showing an example of a partition, viewed from above and perpendicular to the wharf surface. [Figure 3] Figure 3 is a schematic diagram of a coke extinguishing method in a wharf according to an embodiment of the present invention. [Modes for carrying out the invention]

[0026] The present invention will be explained with reference to the figures. The figures show one embodiment of the present invention, and the present invention is not limited to this embodiment.

[0027] [Conventional coke production methods] First, let's explain the general method of coke production. Figure 1 shows an example of coke production equipment. The coke oven 1 mainly consists of carbonization chambers 2 arranged in a row, and coke 3 is produced by carbonizing coal charged into these carbonization chambers. The carbonized coke is red-hot at about 1200°C and is also called red-hot coke. The coke 3 carbonized in the carbonization chamber is pushed out from one side of the carbonization chamber by an extruder (not shown) and discharged into a fire extinguishing cart (cart) 4 (this is called kiln discharge).

[0028] The coke 3, which has been unloaded from the kiln into the fire extinguishing vehicle 4, is transported by the fire extinguishing vehicle into the fire extinguishing equipment 5. The fire extinguishing equipment 5 has a water spraying equipment 6, and water 7 is sprayed from the water spraying equipment 6 to extinguish and cool the red-hot coke 3 in the fire extinguishing vehicle 4. The amount of water 7 sprayed from the water spraying equipment 6 is sufficient to completely extinguish the red-hot coke.

[0029] The coke 3, which has been extinguished and cooled by the fire extinguishing equipment 5, is transported to the wharf 10 while still loaded on the fire extinguishing vehicle 4. The wharf 10 is a sloping flat plate, and the coke 3 is discharged from the fire extinguishing vehicle 4 to the wharf 10 by opening the side plate on the wharf side of the fire extinguishing vehicle or by tilting the fire extinguishing vehicle. The coke 3 discharged onto the wharf 10 spreads and accumulates on the wharf according to its slope. The coke 3 is left in this state for a certain period of time (several tens of minutes) to cool down to a temperature below which equipment failures such as melting of the belt conveyor will not occur. Basically, it is cooled by natural cooling. Equipment failures of the belt conveyor are mainly due to the melting of the belt by coke, and since the heat resistance temperature (surface temperature) of the high-temperature belt of the belt conveyor is about 200°C, it is good to manage the belt conveyor heat resistance temperature at 200°C.

[0030] The cooled coke 3 is transferred to a belt conveyor 8 and transported to a storage facility (not shown). In the case of the steelmaking process, after being transported to the storage facility, the required amount is cut out and transported to a blast furnace (not shown) and charged into the blast furnace. As mentioned above, it is desirable for the coke to have a low moisture content, and in particular, the moisture content of the coke charged into the blast furnace should be 8.0% or less. Preferably, it should be controlled to be 7.0% or less, 6.0% or less, 5.0% or less, 4.0% or less, and 3.0% or less.

[0031] [Wet Coke Fire Extinguishing Method According to the Present Invention] <Wharf section> Wharf 10 is divided into multiple sections 11 of arbitrary size. Figure 2 is a conceptual diagram showing an example of a section 11, viewed from above and perpendicular to the wharf surface. The dotted lines in Figure 2 divide Wharf 10 into individual sections. In the case of Figure 2, it is divided into 42 sections, 7 horizontally and 6 vertically.

[0032] The wharf does not need to be physically divided; it only needs to be virtually divided. That is, instead of dividing the wharf with fences or partitions, it is sufficient to divide it with invisible demarcation lines. The coke 3 discharged from the fire truck accumulates according to the slope of the wharf 10. At this time, it is spread out more thinly and widely than when it was loaded inside the fire truck, and the sensible heat of the coke 3 is more easily dissipated into the atmosphere. It is left in this state for a predetermined time to cool.

[0033] <Measurement of coke temperature within the section> The temperature of the coke is measured for each section 11 in Figure 2. For temperature control purposes, it is desirable to measure the temperature immediately after discharge. If possible, the measurement should be taken within 3 minutes after discharge, preferably within 2 minutes, and even more preferably within 1 minute. The measurement method is not particularly limited. Since the coke immediately after discharge to the wharf usually has a temperature of around 500°C, it is desirable to measure it non-contact. As long as it is a non-contact temperature measurement, the method is not particularly limited, such as radiation infrared measurement or thermography.

[0034] The temperature of the coke within each section 11 of the wharf is measured as the temperature of the surface of the deposited coke. One or more points of temperature are measured for each section. If multiple points are measured, the average temperature may be used as the coke temperature for that section. If a measurement is taken at one point within a section, that point may be used as the representative point for the coke temperature of that section. If coke is present in only a portion of a section, the temperature of only the portion containing coke should be measured.

[0035] <Lower Discharge Temperature> As mentioned above, it is preferable that the coke temperature immediately after being discharged into the wharf is above the discharge limit temperature. If the coke is discharged into the wharf at a temperature below the discharge limit temperature, it may cool on the wharf and reach the evaporation limit temperature when it is discharged onto the belt conveyor. The evaporation limit temperature is the minimum temperature required for the moisture contained in the coke to evaporate. If the temperature falls below the evaporation limit temperature, the moisture contained in the coke will not evaporate, resulting in a larger amount of moisture being brought into the blast furnace, which is inconvenient for blast furnace operation. Therefore, the amount of water sprayed (primary spray) in the fire extinguishing equipment is adjusted so that the discharge temperature into the wharf is above the discharge limit temperature. The inventors have empirically confirmed that the lower evaporation temperature is approximately 60°C. Therefore, the lower discharge temperature is preferably set to 60°C, and more preferably to 61°C, 62°C, 63°C, 64°C, or 65°C.

[0036] In the inventors' experiments, it was found that in a typical coke oven, if the coke discharge temperature from the wharf is 400°C, the coke temperature will drop to below 60°C after 20 minutes of cooling on the wharf. Therefore, the lower limit of the discharge temperature from the wharf should be set to 400°C, preferably 410°C, 420°C, or 430°C. However, since this cooling time varies depending on the environment of the wharf and the amount of time the coke can be left on the wharf, the lower limit of the discharge temperature should be set according to the wharf equipment.

[0037] There are no particular limitations on the method for adjusting the water spray rate of the fire extinguishing system so that the wharf discharge temperature is equal to or above the lower discharge temperature. For example, the amount of primary water sprayed in the fire extinguishing system for the next batch of coke oven discharged can be determined from the amount of primary water sprayed in the fire extinguishing system for the previous batch of coke oven discharged and the wharf discharge temperature. If the wharf discharge temperature falls below the lower discharge temperature, the amount of primary water sprayed can be adjusted. decrease If the temperature exceeds the lower limit of discharge temperature + 5°C, the primary water spray amount will be reduced. Increase Control measures such as quantification can be considered.

[0038] Alternatively, taking into account inter-batch variations, it is possible to control the primary water spray rate for the next batch of kiln-out firings based on the average primary water spray rate and the average wharf discharge temperature from the previous batch of firings.

[0039] <Maximum payout temperature> As mentioned above, it is preferable to keep the coke discharge temperature from the wharf below the upper discharge temperature. If coke is discharged to the wharf at a temperature above the upper discharge temperature, even if it is cooled on the wharf, it may exceed the belt conveyor's heat resistance control temperature when discharged to the belt conveyor, which can cause equipment failure of the belt conveyor. The heat resistance temperature (surface temperature) of the high-temperature belt of the belt conveyor is around 180-200°C (for example, Bando HC710, HC1500). Therefore, it is best to set the belt conveyor's heat resistance control temperature to 200°C.

[0040] In the inventors' experiments, it was found that in a typical coke oven, if the coke discharge temperature from the wharf exceeds 600°C, the coke temperature will not fall below the belt conveyor's heat resistance control temperature of 200°C even after 30 minutes of cooling on the wharf. Therefore, the upper limit of the discharge temperature from the wharf should be set to 600°C, preferably 590°C, 580°C, or 570°C. However, since this cooling time varies depending on the wharf environment and the time the coke is left on the wharf, the upper limit of the discharge temperature should be set according to the wharf equipment.

[0041] <Secondary watering> If the coke temperature measured for each section is found to be above the upper limit of the coke discharge temperature, it is advisable to sprinkle water (secondary sprinkling) on ​​that section to bring the coke temperature below the upper limit. In other words, instead of sprinkling water on the entire coke, sprinkling water only on the coke in the section that has exceeded the upper limit of the discharge temperature can be avoided, and the amount of water sprinkled can be reduced. As a result, the coke content can be reduced.

[0042] [Coke production apparatus according to the present invention] Next, a coke manufacturing apparatus according to one embodiment of the present invention will be described.

[0043] <Temperature measurement means> As mentioned above, the temperature measurement means is not particularly limited, but it is preferable to use a non-contact temperature measurement means. Examples include infrared radiation thermometers and thermal viewers. The temperature measuring device should be positioned to measure one or more points in each section. For example, one or more devices may be installed in each section. If only one temperature measuring device is installed in a section, it should be positioned to be swivelable so that one device can measure the temperature at multiple points within the section. For example, the temperature measuring device could be a thermal viewer, and multiple sections could be measured simultaneously with the thermal viewer.

[0044] When arranging multiple temperature measuring devices, it is advisable to arrange them so that temperature can be measured at multiple points within the area. Of course, even when multiple devices are arranged, each temperature measuring device may be swivelable and have a structure that allows each to measure temperature at multiple points. There are no particular limitations on the mounting means for the temperature measuring devices.

[0045] Furthermore, the temperature measuring device may be structured in such a way that it can observe the entire wharf with a single device. For example, by fixing a single temperature measuring device in the space on the wharf and making it swivelable, it is possible to determine which section of the wharf's coke temperature is being measured from the position information of the temperature measuring device, and then calculate the coke temperature of that section from the measured temperatures at one or more points within that section.

[0046] Furthermore, for example, the temperature measurement means can be a thermoviewer, and the measurement range of the thermoviewer can be defined as one section, and the coke temperature of that section can be calculated. In other words, one pixel of the thermoviewer can be defined as the smallest section unit.

[0047] For example, the temperature measuring device may be positioned to move within the space on the wharf. For instance, a temperature measuring device mounted on a drone may move within the space on the wharf, or a temperature measuring device may be mounted on the tip of an arm. From the position information and direction information of the temperature measuring device, it is possible to determine which section of the whar's coke temperature is being measured, and to calculate the coke temperature of that section from the measured temperatures at one or more points within that section.

[0048] <Wharf watering (secondary watering) method> The means of watering (secondary watering) at the wharf are not particularly limited; for example, a watering nozzle is preferred. There are many types of watering nozzles, such as cone-shaped and elliptical types, but they are not particularly limited. From the viewpoint of uniform watering, a cone-shaped watering nozzle is preferred.

[0049] The amount of water sprayed should be determined appropriately based on the size of the section, the number of nozzles in the section, and the wharf conditions (installation angle, environment, etc.).

[0050] It is preferable to have one or more watering devices in each section. For example, one or more can be installed in a single section. If one watering device is installed in a single section, it is preferable that the watering device is designed to cover the entire surface of that section. If multiple watering devices are installed in a single section, they should be arranged so that the amount of water distributed is as even as possible within that section. If the amount of water distributed is uneven within a section, it may result in excessive watering and an increased moisture content in the coke, or conversely, insufficient watering, preventing the coke temperature from falling below the discharge limit temperature, resulting in coke that is above the belt conveyor's heat resistance control temperature.

[0051] The watering means may be arranged so that a single watering means can water multiple sections. For example, a single watering means may be positioned in the space on the wharf so that it can swivel and water multiple sections. Alternatively, for example, a watering means may be mounted on the tip of an arm so that it can water multiple sections. In such cases, it is preferable to determine which section of the wharf is being watered from the position information and swivel angle information of the watering means, and then control the amount of water sprayed and, if applicable, the watering pressure based on the distance and angle to that section, so that the entire area of ​​the section is watered.

[0052] If the temperature measuring means is a thermoviewer, it may identify the portion of the area that exceeds the upper limit of discharge temperature and, based on its location information, spray water from the corresponding watering means for that portion.

[0053] <Integrated structure for temperature measurement and watering> For example, the temperature measuring means and the watering means may be integrated into a single structure. An integrated structure means that the temperature measuring means and the watering means acting on the same section are installed as a single structure. By making the integrated temperature measuring means and watering means movable to any location on the wharf, water can be sprayed only on the minimum necessary area (the area where the coke temperature exceeds the discharge upper limit temperature), thereby suppressing the amount of water sprayed.

[0054] For example, if a temperature measuring device and a water spraying device are mounted at the tip of an arm, and the coke temperature measured by the temperature measuring device exceeds the upper limit discharge temperature, a predetermined amount of water can be sprayed from the integrated water spraying device. In this case, the measurement range of a single measurement by the temperature measuring device can be set to the smallest possible area, and if the coke temperature exceeds the upper limit discharge temperature in this smallest area, water can be sprayed to extinguish the fire and cool it down. In other words, by scanning such an integrated temperature measuring device and water spraying device over the wharf, water can be sprayed only on the necessary parts (the parts that have exceeded the upper limit discharge temperature) of the coke on the wharf, and as a result, the amount of water sprayed can be minimized. [Examples]

[0055] Examples will now be described. Based on operational records of the same coke oven and the same coke discharge volume, the inventors compared the amount of water sprayed and the moisture content of the coke when the present invention was applied with the conditions before application. The upper discharge temperature limit, lower discharge temperature limit, belt conveyor heat resistance control temperature, and lower evaporation temperature limit were set as follows. Maximum discharge temperature: 600℃ Discharge lower limit temperature: 400℃ Belt conveyor heat resistance control temperature: 200℃ Lower evaporation temperature: 60℃ Wharf section division: Divided into 6 sections to have equivalent area. Temperature measurement method: Infrared thermography (commercially available, with laser pointer) Temperature measurement method: The temperature of five points in each section was measured manually from the side of the wharf, and the average temperature was taken as the section temperature. Secondary watering method: Cone-shaped watering nozzle Secondary watering method: Four watering nozzles are placed on each section so that the watering surface covers the entire area of ​​that section. Primary watering volume: Evaluated by watering time (seconds) because the flow rate is constant. Secondary watering volume: Evaluated by watering time (seconds) as the flow rate is constant. However, the amount of secondary watering (per plot) was set to 5% of the amount of primary watering. Water spraying for fire extinguishing equipment (primary spraying): Controlled by a spraying timer to control the spraying time (constant flow rate).

[0056] Figure 3 shows a schematic diagram of the coke extinguishing method in a wharf in an embodiment. In Figure 3, the wharf 10 is divided into six sections by dashed lines (indicated by dashed lines in the figure), and a wharf watering device is installed in each section. A handheld temperature measuring device (infrared thermography) 12 was used, and the measurement position was identified from the side of the wharf using a laser pointer 13 to measure the coke temperature of each section. The temperature measuring device may also be installed on a structure or device. In a single measurement, the temperature distribution within the measurement range can be measured, but the highest temperature within the measurement range was taken as the coke temperature for that measurement range. In this way, five arbitrary points within the same section were measured, and the average temperature was taken as the coke temperature for that section. The coke temperature of this section was transmitted to a control device (not shown), and based on this coke temperature, the control device controlled the water spraying (primary water spraying) and wharf water spraying (secondary water spraying) of the fire extinguishing equipment. Figure 3 schematically shows only two watering nozzles 14 in the lower right section of the wharf; however, in reality, four watering nozzles 14 are arranged in one section, so that the watering surface of each nozzle on the wharf covers the entire section. The control system is configured to control the watering from the wharf watering means (watering nozzle) 14 when the coke temperature in a section exceeds the discharge upper limit temperature (600°C). At this time, the watering time was pre-programmed into the control system to be 5 seconds or 10 seconds.

[0057] Coke moisture content: Coke (sample) discharged from the wharf onto the belt conveyor was collected, then dried in an infrared heating oven, and the coke moisture content was measured. The coke moisture content is calculated using the following formula. Coke moisture content (%) = {Weight of sample after sampling (g) - Weight of sample after drying (g)} / {Weight of sample after sampling (g)} × 100 In the comparative example (conventional example), instead of secondary watering, when red-hot coke was visually detected on the wharf, water was injected (discharged) using a commercially available watering hose to extinguish the fire. The flow rate at this time was approximately twice the amount of water sprayed to one section in the present invention example.

[0058] Table 1 shows the measurement results. As can be seen from Table 1, it was confirmed that the present invention eliminates red-hot coke when discharging from the wharf to the belt conveyor and reduces the moisture content of the coke.

[0059] [Table 1] [Industrial applicability]

[0060] This invention can be used in coke production, particularly in coke for ironmaking. [Explanation of symbols]

[0061] 1. Coke oven 2 Carbonization chamber 3 Coke 4 Fire truck 5 Fire extinguishing equipment 6. Sprinkling (Primary Sprinkling) Methods 7. Watering (Primary watering) 8 Belt conveyor 10 Wharf 11 (Wharf) Sections 12. Temperature measurement means (infrared thermography) 13. Laser Pointer 14. Wharf watering means (spray nozzle) 15. Watering

Claims

1. In a wet coke extinguishing method in which coke removed from the carbonization chamber is sprayed with water using a fire extinguishing system and then discharged to the wharf, The aforementioned wharf is divided into multiple virtual sections, and the coke temperature is measured within 3 minutes after discharge for each virtual section. The fire extinguishing equipment is used to spray water so that the measured coke temperature is equal to or above a predetermined lower discharge temperature. A method for wet extinguishing coke, characterized by spraying water onto the virtual section in which the measured coke temperature exceeds a predetermined discharge upper limit temperature.

2. The coke wet fire extinguishing method according to claim 1, wherein the temperature measuring means for measuring the coke temperature measures the coke temperatures of multiple virtual compartments simultaneously with a single temperature measuring means.

3. The coke wet extinguishing method according to claim 1, wherein the temperature measuring means for measuring the coke temperature measures the coke temperature of the entire wharf at once with a single temperature measuring means.

4. A method for wet extinguishing coke according to any one of claims 1 to 3, wherein one or more whirl sprinkling means for sprinkling water into the virtual compartments are arranged in each virtual compartment, and water is sprinkled into the virtual compartments where the coke temperature exceeds the discharge upper limit temperature.

5. In a coke oven equipped with fire extinguishing equipment and a wharf, The wharf is divided into a plurality of virtual sections, and a temperature measuring means for non-contactly measuring the coke temperature in all of the virtual sections, and a wharf watering means having a watering surface corresponding to the virtual section, A wet cooling system for coke, characterized by having a control means that controls the wharf watering means to sprinkle water on the virtual section where the coke temperature measured by the temperature measuring means exceeds a predetermined discharge upper limit temperature, and controls the amount of water sprinkled by the watering means of the fire extinguishing equipment so that the coke temperature measured by the temperature measuring means is equal to or greater than a predetermined discharge lower limit temperature.

6. The coke wet cooling apparatus according to claim 5, further comprising the temperature measuring means for simultaneously measuring the temperatures of multiple virtual compartments.

7. The coke wet cooling apparatus according to claim 5, further comprising the temperature measuring means for measuring the coke temperature of the entire wharf at once.

8. The coke wet cooling apparatus according to any one of claims 5 to 7, wherein one or more of the wharf watering means are arranged in each virtual section.

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