JP3179311B2 - Operating method of coke dry fire extinguishing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a coke dry fire extinguishing system of a shaft type for extinguishing and cooling red hot coke of different properties produced in a coke oven.

[0002]

2. Description of the Related Art In recent years, a shaft type coke dry fire extinguishing system (hereinafter simply referred to as "CDQ") has been employed as a fire extinguishing system for red hot coke produced in a coke oven. As shown in FIG. 3, the shaft type dry fire extinguishing system includes a pre-chamber 2 having a charging port 1 at a top thereof,
A cooling chamber 4 provided with a circulating gas blowing device 3 for cooling at a lower portion, and a discharge device 5 provided at a lower portion thereof
The dust-containing gas 7 from the sloping flue 6 at the top of the cooling chamber 4 is supplied to the small flue 8, the flue 9 and the dust remover 1.
0 to the waste heat recovery facility 11.

[0003] Red hot coke Ch from a coke oven (not shown) is charged into a pre-chamber 2 from a charging port 1 and passes through the pre-chamber to a cooling chamber 4.
In the process of flowing down the inside, it comes into contact with the cooling circulating gas from the cooling gas blowing device 3, is extinguished and cooled, is discharged from the discharge device 5, and is carried out by the transfer device 12.

During this time, the high-temperature dust-containing gas 7 generated in the cooling chamber 4 is discharged from the sloping flue 6 to a small flue 8, passes through a flue 9 and a dust remover 10, and forms a waste heat recovery facility 11. It is introduced into the heat boiler 11b. In this process, the air intake 13 provided in the flue 9
Temperature is controlled by the air taken in from The gas introduced into the exhaust heat recovery facility 11 and subjected to heat recovery is dust-removed by the secondary dust remover 14 and blown into the cooling chamber 4 via the blower 15 and the cooling gas blowing device 3.

Conventionally, coke C extinguished by this CDQ
Since c is often used for the same application as the same lot, the transport line by the transport device 12 is one system, and the coke discharged from the discharge device 5 after the fire extinguishing and cooling is the same type (property) of coke. For example, in the steel process, it is supplied directly to the blast furnace,
When the balance with the discharge amount from the DQ does not match, a measure is often taken such as extracting from the middle of the transfer line by the transfer device to the outside of the system and storing it in another place.

However, recently, from the viewpoint of using low-quality coal or improving productivity, production of coke by low-temperature carbonization has been attempted, and the coke obtained by low-temperature carbonization may have different properties. There is. On the other hand, applications may be different, and there is an increasing demand for producing coke of different properties. For this reason, when red-hot coke of different properties obtained in one or a plurality of coke ovens (kilns) is extinguished with one CDQ, operating conditions of the CDQ are properly used, and cokes of different properties are selectively used. There is also a request to manufacture.

In order to produce coke having different properties, it is necessary to grasp the properties of red-hot coke produced in a coke oven, for example, temperature, residual volatile matter, and the like. In order to optimize the timing of controlling the amount of blown gas and the temperature for the coking, it is necessary to grasp the position (falling state) of the coke charged in the CDQ in lots (at least for one kiln).

[0008] However, there is no technology that can meet such a demand. Among the technologies already disclosed, in the case of extinguishing and cooling red hot coke from a coke oven with a CDQ, as a technology that attempts to cope with the coke discharged from the discharger and the red hot coke charged into the charging inlet. There is one disclosed in JP-A-59-179584.

[0009] In this technique, for each group of glowing coke of the same group that has been continuously charged in 6 or more kilns, the coke discharged from the CDQ for the purpose of grasping the properties thereof is determined in advance by determining the average residence time. Sampling of coke discharged from CDQ, which is considered to be kilns between the third and fourth kilns of the group and the third and fourth kilns before the end of the kilns of the same group, is analyzed and used for coke oven temperature and compounding management. Is the thing.

[0010] However, this technique uses a plurality of lots of red hot coke of different properties from a coke oven as one CDQ.
It is not intended to control the fire extinguishing cooling conditions for each lot to obtain coke of different properties and to separate and discharge them.
There is no proposal for tracking the position of coke charged into the CDQ, that is, the state of coke descent for each lot in the pre-chamber and the cooling chamber, and separately managing each lot. This is because the coke extinguished by the CDQ was treated as the same type, and there was no point in tracking its descending state.

[0011] As described above, since the industrial significance has been added to accurately grasping the position of the injected red hot coke in the CDQ chamber and tracking the descending state of the coke, the technical The solution was long-awaited.

[0012]

SUMMARY OF THE INVENTION The present invention relates to a single CD.
The combustion conditions of two or more types of red-hot coke (multiple lots of coke) charged in Q, mainly in the pre-chamber, are controlled for each lot, so that the coke of the target properties can be produced with high accuracy, and in the CDQ chamber. In this case, the position of the coke is accurately grasped and the coke descent state is tracked, so that the lot can be separately conveyed.

For example, the above-mentioned Japanese Patent Application Laid-Open No.
The technique disclosed in Japanese Patent Laid-Open Publication No. H08-27138 has the following problems and is unsuitable for solving this problem. First, the coke residence time in the CDQ is to be controlled by the average time. Generally, the coke discharge speed from the CDQ is easily and frequently changed due to troubles on the coke oven side or reasons for carbonization control. In addition, the amount of cooling gas varies depending on the temperature level of the cooling gas, and the residence time may vary by 30 minutes or more depending on the amount of coke layer deposited in the chamber when red hot coke is charged, that is, the coke upper surface level. Therefore, it is difficult to accurately track the input coke by the management based on the average residence time.

Second, the condition is that six or more kilns are continuously charged in the same kiln group. In the actual operation, coke of the same type is not always continuously supplied in six or more kilns, and for example, a fine operation action may be taken in units of one kiln.

[0015] Third, the technique is not a technique capable of grasping the descending behavior of the input coke in the CDQ chamber and tracking the coke height position.

In the present invention, the position of the coke charged in the CDQ in the height direction is tracked and grasped. As a result, two or more types of coke having different properties (a plurality of lots of coke) are used as a lot. Individual control can be performed in units, and as a specific application method, the amount of combustion air blown into the pre-chamber is adjusted according to the properties of coke charged into the pre-chamber, that is, residual volatile matter, coke temperature, etc. An object of the present invention is to take a CDQ operation action such as adjusting the amount of circulating gas for cooling at a timing estimated to have reached the chamber position, accurately produce coke of a desired property, and separate and discharge the coke. Another object of the present invention is to make it possible to separately discharge a plurality of lots of coke having different properties obtained in the above-described manner, and to transport the separated cokes according to the purpose.

[0017]

Means for Solving the Problems The first invention of the present invention is:
By measuring the apparent volume of coke in each lot put into the dry fire extinguishing system, the height of the top surface of the coke staying in the chamber at the time of charging, and the coke discharge speed from the lower outlet of the chamber, the coke in each lot put in was measured. Operation of coke dry fire extinguishing equipment characterized by constantly tracking the position in the chamber, calculating the discharge timing of coke for each lot from the lower discharge port, switching the discharge line and discharging coke after extinguishing by lot Method.

According to a second aspect of the present invention, in addition to tracking the position in the chamber of each lot of coke supplied by measuring the top surface height of coke staying in the chamber and the coke discharge speed, the coke is supplied to a dry fire extinguishing facility. Measure the apparent volume, temperature, particle size distribution, and residual volatile content of red hot coke for each lot, and burn into the pre-chamber according to the apparent volume, temperature, particle size distribution, and residual volatile content of red hot coke for each lot. This is a method for operating a coke dry-type fire extinguishing facility, which comprises adjusting the amount of air for use, the temperature, the amount of circulating gas for cooling blown into a cooling chamber, and the temperature to produce coke of a target property.

[0019]

According to the present invention, the descending state of a plurality of lots of coke charged in one CDQ in the pre-chamber is grasped in lot units, and the properties of coke, that is, residual volatile matter and By adjusting the amount of combustion air blown into the pre-chamber and the temperature according to the coke temperature, etc., it is possible to accurately produce coke of desired properties, produce coke groups of multiple lots with different quality and properties, and separate them by lot. It can be transported.

Therefore, a single CDQ can be used separately for the production of coke of a plurality of lots having different properties according to various uses, and can be separated and discharged, so that the cost of the CDQ equipment can be greatly reduced and the productivity can be reduced. Can also be improved.

When red hot coke is introduced from the upper charging inlet of the CDQ, the coke in the CDQ gradually lowers as the cooling coke is discharged by the lowermost coke extracting device. The discharge by the coke cutting device may take a continuous discharge form or an intermittent discharge form, and the input of the red hot coke is performed intermittently.

At this time, up to the middle of the CDQ, that is, in the range of the height of the pre-chamber region and the upper third of the cooling chamber, the coke in the same horizontal section descends in a layer at almost the same speed, and in the vertical direction. No coke disturbance or agitation / mixing occurs. However, due to the narrow coke outlet below the middle section and the cooling circulating gas blowing device installed for blowing the circulating gas for cooling, the coke in the same horizontal section is uniformly lowered. As a result, mixing occurs between the upper end of each layer and the lower end of the layer immediately above.
Therefore, if two or more types of red-hot coke are charged alternately in layers from the charging inlet, the mass flow cannot be maintained in the process of descending from less than two-thirds of the body of the cooling chamber to the discharge part, and it is completely separated after discharge. It will be difficult to do.

Through a number of tests, the inventors have determined that C
Although the coke discharged from the DQ has a mixed state of about 10% at the boundary between different coke groups (for example, a kiln unit) between different layers, it can be separated for each input coke group. I found something.

The behavior of coke in a CDQ chamber (meaning a pre-chamber and a cooling chamber, in this case, hereinafter referred to as a “chamber”) is to input a marker or the like together with coke and detect the marker. Can also be grasped. However, in this method, the equipment cost for inserting and detecting the marker is increased, and the sorting cost for excluding the marker and the production cost of the marker when the sorting is not performed increase as the running cost. In the present invention, the first consideration is to suppress the increase in the CDQ equipment cost and the running cost even if the separation accuracy is slightly reduced, and further to avoid the complexity of the work.

The present invention will be described in detail with reference to FIG.
FIG. 1 schematically shows a CDQ implementing the present invention. Red hot coke Ch from the coke oven is introduced into the chamber 2 from the charging inlet 1. In this chamber, the upper part is called a pre-chamber 2 and the lower part is called a cooling chamber 3. Both forms a continuous chamber, and the pre-chamber 2 contains the red hot coke charged into the pre-chamber. Blow-in pipe 1 for combustion air 16 to be burned
A cooling circulating gas blowing pipe 3 for extinguishing and cooling red hot coke is provided in the cooling chamber 4.
a is provided.

In the lower part of the cooling chamber 4, coke C after extinguishing and cooling in the cooling chamber is provided.
A discharging device 5 for discharging c is provided, and a sloping flue 6 for discharging dust-containing exhaust gas 7 from the chamber is provided at a boundary between the pre-chamber and the cooling chamber.

The circulating gas for cooling, which cools the red hot coke in the cooling chamber and raises the temperature, flows from the cooling chamber 4 through a sloping flue 6, a small flue 8, a flue 9 called a circular flue or a ring duct, and a dust remover. Led to a waste heat boiler.

According to the present invention, the thus constructed CDQ
In the operation of (1), first, the amount (apparent volume) of red-hot coke Ch to be charged into the CDQ from the coke oven, the rate of discharge of coke Cc from the discharge device 5 below the cooling chamber 4, and the amount of coke deposited in the chamber at the time of charging, that is, The height of the upper surface of the deposited coke is detected.

The accuracy of the amount of red hot coke charged to the CDQ is high if it can be weighed, but weighing for each kiln in actual operation is limited in terms of cost and cycle time and is not practical. . On the other hand, the amount of coal charged into the coking chamber of a coke oven is usually measured for each kiln from the viewpoint of coke oven operation management, and the coke weight per kiln can be easily determined from the weight and coal volatile matter. Can be calculated.

Next, the discharging speed from the lower CDQ discharging device 5 is calculated. The discharge speed may be a gate type, a rotary feeder type or a vibratory feeder type in the discharge device 5. In the case of the gate type, the number of times of opening / closing within a certain time of gate opening / closing and the number of times per discharge The discharge rate can be calculated based on the discharge amount of. In the case of the rotary type or the vibration feeder type, the discharge speed can be calculated from the number of revolutions or the frequency and the amplitude.

Further, by providing a weighing device on the transport line immediately after discharging from the CDQ discharging device 5, the discharged coke amount can be directly measured to calculate the discharging speed. Then, the height of the deposited coke in the chamber when the red hot coke is charged into the CDQ is detected. The height of the deposited coke can be detected by, for example, an ultrasonic level meter in addition to the radiation level meter 18 including a γ-ray source and a γ-ray detector.

From these data, it is possible to track the position of the coke group in each lot in the CDQ chamber in the height direction, for example, with each kiln as the minimum lot by calculation.

The specific method will be described in detail below. The height h1 (m) of the CDQ pre-chamber 2 after the introduction of coke Ch for t minutes is estimated. This height is considered based on the lower end of the cooling chamber straight body. It is assumed that red hot coke Ch of W1 (ton) is supplied at the time when coke is accumulated up to a certain height h0 (m) in the CDQ chamber.

The packing bulk density at the time of depositing coke is 0.6
(Ton / m ³ ) and the horizontal cross-sectional area of the CDQ pre-chamber 2 is Spc (m ² ), the layer thickness Ipc (m) of the coke of W1 (ton) in the chamber is Ipc = W1 / 0.6. × Spc (1). Set the coke discharge speed from the bottom of the chamber to G
(Ton / min), the speed V (m / min) at which the coke layer descends due to discharge is as follows: V = G / 0.6 × Spc (2) From these, the height h1 (m) of the lower surface of the coke layer of the coke charged t minutes ago is h1 = h0-{G / (0.6 x Spc) x t} when it is in the pre-chamber area. (3) At this time, the coke layer upper surface height of the coke =
h1 + Ipc (m) Further, the upper surface height h0 of the course layer is as follows: h0 = G / (0.6.times.Spc) .times.t + 1pc (m) (4)

When the discharge speed G changes with time and can be expressed by the discharge amount G (t), the height h1 (m) of the lower surface of the coke layer of the coke charged t minutes ago.
Is

(Equation 1) Is determined by

Further, after the input coke descends and enters the cooling chamber (height h0 'region),
Assuming that the horizontal cross-sectional area is Scc instead of Spc and the traveling time in the pre-chamber is t0, the height h1 (m) of the lower surface of the coke layer is

(Equation 2) Is obtained.

The information of the coke input amount, the CDQ discharge speed, and the coke deposition height in the chamber at the time of each kiln input was always input to a computing unit (computer) of the CDQ data processing system, and was input into the CDQ chamber. The charging time of each kiln (by lot) is grasped from time to time, and identification of each kiln (by lot) of coke discharged from the chamber position and the discharge port is performed.

According to the method of the present invention, assuming that the discharge speed is constant, the descent position of the introduced coke in the chamber is estimated from the average residence time of the coke in the CDQ, Compared to the method of estimating without considering the coke deposition height in 2, the accuracy is much better.

However, it is possible to estimate with high accuracy up to about one third of the upper part of the cooling chamber 4, but at a level lower than that, the mass flow collapses due to the reduction of the cross-sectional area of the lower part of the chamber and the blowing device of the circulating gas for cooling. Will not be able to maintain the descent. Therefore, a mixing phenomenon occurs near the interface with a different coke layer in a range of less than 10%. As a method of grasping the position in the height direction in the CDQ chamber while avoiding the above-mentioned increase in cost, It is sufficient for practical use.

Thus, the cooling chamber 4
The input coke can be tracked down to the lower discharge device 5, and when the properties and carbonization conditions are different for each input kiln and it is desired to separate and use after CDQ discharge, the discharge timing is managed by the method described above, It is possible to calculate the traveling time to the branching device in the transport line and to separate by switching.

In the technology for burning volatile components remaining in the input red hot coke and entrained coke in the pre-chamber 2, when a combustion air blowing device is provided above the pre-chamber. According to the method for grasping the position in the height direction in the CDQ chamber according to the present invention, at the timing when it is estimated that the red hot coke has reached the combustion air blowing device level and the cooling circulating gas blowing device level of the pre-chamber. It is possible to increase or decrease the amount of combustion air in accordance with the amount of residual volatile matter.

Further, a CDQ in which a combustion air blowing device is not installed in a coke deposit layer in a pre-chamber is provided.
In the method of the present invention, coke having different properties such as coke temperature, particle size distribution and residual volatile matter at the time of being discharged from the coke oven into the cooling chamber by the method of grasping the drop state in the height direction in the CDQ chamber according to the present invention is dropped. It is possible to increase or decrease the amount of circulating gas for cooling at the time it is estimated to have reached, meaning that it saves blower power and also functions effectively as a method for stabilizing the temperature of hot gas sent to the boiler. Is possible.

[0043]

【Example】

(Embodiment 1) An embodiment of the present invention will be described with reference to FIG. In this embodiment, red hot coke having different properties from two coke ovens of a first coke oven 20a and a second coke oven 20b are alternately charged into one CDQ, and two types of different quality ranks are provided. CDQ by separating coke
This is the case when the waste is separated and discharged.

In FIG. 2, each coke oven 20a, 20
Red hot coke Ch extruded from each kiln (carbonization chamber)
Is transported by the bucket 21 to the charging inlet 1 at the top of the CDQ, and is charged into the pre-chamber 2 via the charging device 222. The pre-chamber 2 has a combustion gas injection pipe 1
The combustion air 16 for burning and removing volatiles remaining in the coke lump (group) for each kiln and the associated coke powder is blown.

A cooling circulating gas blow-in pipe 3 is provided below the cooling chamber 4, from which a cooling circulating gas for extinguishing and cooling red hot coke is blown. The coke Cc that has been extinguished and cooled in the cooling chamber 4 is discharged from the lower discharge device 5 and the transfer line is switched by the switching damper 23 to transfer the coke Cc.
a and 24b are separated and transported. The dust-containing exhaust gas 7 from the chamber is introduced into the exhaust heat boiler via the sloping flue 6, the small flue 8, the flue 9, and the dust remover, and after heat recovery, is circulated and used as a circulating gas for cooling. .

A specific example of the method of operating the CDQ in this embodiment will be described below. In this embodiment, the coke processing capacity is 100 T / Hr, and the capacity of the pre-chamber 2 is 330 m.
^{3. For} a CDQ having a capacity of 280 m ^{3 of} the cooling chamber 4 and a cooling gas circulation blower capacity of 150,000 Nm ³ / Hr, the first coke oven 20a having about 20 tons / kiln and 50 carbonization chambers and 25 tons / kiln Red hot coke Ch was introduced from two furnace groups of the second coke oven 20b of 70 coke ovens. The charging timing was set so that charging was performed intermittently at a frequency of 12 kilns / 2 hours.

Red hot coke Ch from the first coke oven
Is a coke with a high temperature, a good quality of coal blend and a high quality rank. On the other hand, the red-hot coke Cc from the second coke oven is a coke having a slightly lower temperature, a slightly lower quality coal blend, and a lower quality rank. Therefore, in this embodiment, after coke from the first coke oven and coke from the second coke oven were cooled by CDQ, two different types (2
(Lot) coke is considered to be transported separately.

First, when the coal C is transported and charged into the kiln (carbonization chamber) of the target kiln number of each coke oven by the loading car 25, the coal before and after the coal is dropped into the coke oven is charged. The weight of the entering vehicle is measured, the amount of coal charged into the kiln is calculated, and transmitted to the calculator 19 of the CDQ data processing system.

The red hot coke obtained by carbonizing coal in a kiln for about 20 hours is extruded by an extruder,
Is transported to the CDQ, and loaded into the pre-chamber 2 of the CDQ via the charging device 22. At this time, the kiln number where this coke was carbonized, the amount of coal charged, coal volatiles and CDQ
The time at which red hot coke is charged to the computer is transferred to the computing unit 19 of the CDQ data processing system.

While the operation of the coke oven is stable, C
Coke injection into DQ is stable, but delays due to troubles or "block operation", that is, in order to secure the inspection time of equipment, block the coke oven extrusion and charging work and concentrate on several kilns When working, and taking a form in which the equipment is inspected for about 30 minutes to 1 hour and the lunch time of the worker is secured, the discharge speed needs to be finely adjusted.

Also in this embodiment, the block working method is employed, and the coke discharging speed from the CDQ is changed according to the coke charging conditions. The coke discharge speed was adjusted by adjusting the rotation speed of the rotary feeder type discharge device 5.

That is, the conversion coefficient between the rotation speed, the discharged coke weight, and the descent speed is input in advance to the calculator 19 of the CDQ data processing system, and the discharge speed is calculated by inputting the actual rotation speed.

The coke deposition level in the chamber when the coke of each kiln was charged into the CDQ was determined with an accuracy of +50 mm by a γ-ray level meter 18 arranged at 50 mm intervals in the vertical direction in the pre-chamber area. Measured. This gamma ray level meter 18
The coke accumulation level information in the CDQ chamber and the coke discharge speed from the discharger 5 are constantly transmitted to the calculator 19 of the CDQ data processing system, and the calculator calculates the coke position in the chamber of each lot for each lot. The discharge timing of each lot of coke from the discharge device 5 is calculated.

Therefore, the output signal causes the CDQ
The change of the coke position of each lot in the chamber can be tracked, and the amount of combustion air blown into the pre-chamber can be controlled according to the properties of the coke of each lot, and the cooling circulation blown into the cooling chamber It can be used for controlling the amount of gas, and can also be used as an instruction signal for a damper switching operation when separating coke of different properties on a coke transport line after the CDQ discharging device.

In this embodiment, the level measurement data is transmitted to the computing unit 19 of the CDQ data processing system every time it is input, and the position of coke for each kiln in the CDQ is calculated by the computing unit 1.
In the pre-chamber, it is tracked by the calculation according to No. 9, and contains volatile oxygen remaining in the coke lump (group) for each kiln and burns and removes the accompanying coke powder. The gas (air) amount is controlled (increased or decreased). Here, first, three cokes are continuously charged from the first coke oven to one CDQ, and then seven cokes are continuously injected from the second coke oven, and then again to the first coke oven. From 5 kilns continuously.

The operating conditions of the coke oven were as follows: the number of kilns in the first coke oven: 1.4 times / kiln / day, the furnace temperature: 1250 ° C., and the number of kilns in the second coke oven: 1.05 times / kiln・
The furnace temperature is set to 1080 ° C. per day. The temperature of coke from the second coke oven is 100 ° C. or more lower than the temperature of coke from the first coke oven, and the residual volatile matter is as high as 1.5% and the coke strength. Here, the coke from the second coke oven is C
From the first kiln to the seventh kiln, which has been put into the DQ, until the end of the coke feeding, the amount of combustion air blown into the pre-chamber is reduced to the amount of combustion air blown in the case of coke from the first coke oven. The amount was set to be increased by about 10%.

After the coke was started to be injected from the first coke oven, the amount of combustion air blown was gradually reduced to an amount corresponding to the residual volatile matter of the coke from the first coke oven and the amount of accompanying coke powder. Back adjustments were made.

As described above, in the pre-chamber, the first
The coke of three kilns (A lot) from the coke oven and the coke of seven kilns (B lot) from the second coke oven with different properties from the coke oven are separated and processed, and the residual volatile matter and accompanying coke powder are sufficiently removed. Could be burned.
At the same time, the amount of cooling circulation gas blown into the cooling chamber was controlled so that the amount of heat brought into the boiler at the same time did not decrease over time, so that the amount of steam recovered by the boiler and the steam enthalpy were constant. .

Then, the coke (A lot) for three kilns from the first coke oven and the seven coke (A lot) from the second coke oven having different properties from the first coke oven obtained by the arithmetic unit as described above. From the top surface height of the coke deposited in the CDQ and the coke discharge speed at the time when the coke (B lot) of the minute is put into the chamber, the position of the coke in the chamber for each lot put into the CDQ is tracked and the lower discharge port is provided. Calculate the discharge timing of coke from each coke oven (from each coke oven), and replace coke from 7 coke ovens (B lot) from the second coke oven with coke from 3 coke ovens (A lot) from the first coke oven. And could be discharged separately.

(Embodiment 2) In this embodiment, the equipment conditions are the same as those in Embodiment 1, and the method of using the coke, which is a product, in the blast furnace is changed. Coke was produced in a coke oven of two furnaces, and high-quality coke from the first coke oven 20a was used in a large-scale blast furnace, and coke from the second coke oven 20b with a slightly lower rank was used in a medium-sized blast furnace. Is the case.

Here, there is only one coke dry fire extinguishing system, and the total amount of coke from the first and second coke ovens is 1
The fire was extinguished at the base CDQ, and the two coke had to be separated after discharge. Therefore, the method of the present invention having a low equipment cost and a low processing cost was adopted on the premise that a mixture of less than 10% was tolerated.

The time from when the coke produced in each coke oven is charged to the CDQ to when it is discharged from the CDQ is tracked for each kiln, and the time required for transportation from the time when the coke is discharged to the switching damper 23 is taken into consideration. After that time, the switching damper separates the coke from the first coke oven 20a and the coke from the second coke oven 16b, and separates them into two-line transfer devices 24a and 24b connectable to the belt conveyors of the respective blast furnaces. Discharged and sent to another blast furnace.

[0063]

According to the present invention, the descending state of the coke charged in the CDQ is grasped in each unit of the coking oven of the coke oven (by lot), and the properties of the coke in each unit of the kiln are determined.
That is, the amount of combustion air introduced into the pre-chamber and / or the amount of cooling gas could be adjusted in accordance with the residual volatile matter and the coke temperature.

Further, utilizing the present invention, two or more kinds of desired coke having different properties are produced in a coke oven, and each coke group is cooled by one CDQ, and after being discharged, it is branched and conveyed on another line. Made it possible. Thus, when two or more types of coke having different properties are cooled, only one CDQ facility is required, and the facility cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a shaft type coke dry fire extinguishing system (inside a chamber) and a descending distribution diagram of coke in the present invention.

FIG. 2 is a side sectional view and a control flow explanatory diagram of a shaft-type coke dry-type fire extinguishing facility according to an embodiment of the present invention.

FIG. 3 is a known side sectional explanatory view.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 charging inlet 2 pre-chamber 3 cooling gas injection device (pipe) 4 cooling chamber 5 discharge device 6 sloping flue 7 dust-containing exhaust gas 8 small flue 9 flue 10 dust remover 11 waste heat recovery equipment 11b waste heat boiler 12 transport Apparatus 13 Air intake port 14 Secondary dust remover 15 Blower 16 Combustion air 17 Combustion air blowing pipe 18 Radiation level meter 19 Computing unit 20a First coke oven 20b Second coke oven 21 Bucket 22 Charging device 23 Switching damper 24a, 24b Conveying line 25 Coal charging vehicle Ch Red hot coke Cc Cooling coke

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-120277 (JP, A) JP-A-7-109462 (JP, A) JP-A-63-308091 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) C10B 39/02 C10B 39/16 G05D 23/00

Claims (2)

(57) [Claims] 1. A method of measuring the apparent volume of red-hot coke in each lot to be injected into a dry-type fire extinguishing system, the height of the top surface of coke staying in a chamber at the time of injection, and the rate of coke discharge from a lower outlet of the chamber. Tracking the position of coke for each lot in the chamber,
A method for operating a dry coke fire extinguishing system, comprising calculating a discharge timing of coke for each lot from a lower discharge port, switching a discharge line and discharging coke after extinguishing by lot. 2. In addition to tracking the in-chamber position of each lot of coke charged by measuring the top surface height of coke staying in the chamber and the coke discharge speed, each lot of coke charged into the dry-type fire extinguishing facility is measured. Measure the apparent volume, temperature, particle size distribution and residual volatile matter of the red hot coke, and according to the apparent volume, temperature, particle size distribution and residual volatile matter of the red hot coke for each lot, the amount of combustion air blown into the pre-chamber, A method for operating a coke dry-type fire extinguishing facility, comprising adjusting a temperature, an amount of circulating cooling gas blown into a cooling chamber, and a temperature to produce coke having a target property.