JP2773610B2 - Automatic control method of cutout amount 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 automatically controlling the amount of coke cut off from a cooling tower of a coke dry fire extinguishing system.

[0002]

2. Description of the Related Art Conventionally, fire extinguishing red hot coke from a coke oven has been carried out by using a wet fire extinguishing method, in which a fire extinguishing truck loaded with red hot coke is moved to a fire extinguisher tower and a large amount of water is sprinkled from the top to extinguish the fire. I was However, the wet fire extinguishing of red hot coke causes not only the huge amount of heat of red hot coke to escape to the atmosphere as steam, but also the coke breeze scattered around the surroundings due to the generated water vapor, which poses a pollution problem. Will be raised. For this reason, the recent mainstream fire extinguishing of red hot coke is a coke dry fire extinguishing that can effectively utilize the huge amount of heat possessed by red hot coke, improve coke quality, and solve or reduce the problem of dust pollution.

In a coke dry fire extinguishing system, red hot coke carbonized in a coke oven is received by a coke bucket mounted on a bucket truck, and the coke bucket is wound by a hoist on the top of a dry fire extinguishing tower comprising a prechamber and a cooling chamber. After the charging lid at the top of the chamber is opened and charged, heat exchange is performed with a circulating inert gas introduced from an inert gas injection port provided at the lower part of the cooling chamber below the pre-chamber, and the temperature is cooled to about 200 ° C. , And a fixed amount is sequentially cut out from the cutout gate at the bottom and transported to the blast furnace. The inert gas heated to nearly 800 ° C by exchanging heat with red-hot coke passes through a small flue provided around the boundary between the pre-chamber and the cooling chamber, and passes through an annular flue in the outer wall of the pre-chamber. After reaching the road, the primary dust is removed by a primary dust remover made of dust-grating bricks installed in the flue, then introduced into a waste heat boiler, heat is recovered, secondary dust is removed by a cyclone, etc. The gas is blown from an inert gas blowing port provided in the air conditioner.

[0004] The amount of coke cut out from the cut-out gate at the bottom of the cooling tower of the coke dry fire extinguishing equipment is usually checked by the operator of the coke dry fire extinguishing equipment by checking the progress of the coke oven kiln discharging operation and the coke stock in the pre-chamber. And the setting value of the cutout amount is changed as needed in accordance with the change of these situations. However, such an operation by the operator has its own limit, and there is a problem that frequent change of the set value is required and thermal balance is lost.

[0005] Another method is to set a cut-out amount each time charging red hot coke into a cooling tower of a coke dry-type fire extinguishing system, and then measure a level measurement value of the red hot coke layer at an arbitrary time during operation and a time. Method for automatically correcting the coke cut-off amount according to the operating time until the scheduled stoppage of the kiln discharge operation (Japanese Patent Application Laid-Open No. 53-57201). The required coke cut-off amount per unit time is determined by the coke cut-off speed. set as, coke off the coke cutting speed calculated from the coke switching decyne scale number DeSo from switching decyne issue of location within the required time elapsed, the coke cutting speed setting and coke switching volume per one calculating a reference coke required cut time intervals and, coke off the coke required cut time intervals with the reference coke required cut time intervals between the coke cutting speed and calculates output Actuating the equipment, a method of matching the coke switching volume to the desired switching output (JP 57-78482
JP), with a cooling tower dumping speed red-hot coke in a given time based on coke extrusion work schedule is set as cutting amount of cooling coke, inventory amount set in advance by measuring the red hot coke stock amount in the pre-chamber A method of automatically correcting the cut-out amount set value when the stock amount is out of the target range (see Japanese Patent Laid-Open No. 1-132).
687), and the like.

[0006]

Problems to be Solved by the Invention
The method disclosed in Japanese Patent Publication No. 201 is intended to continue the cutting of the cooling coke in the coke dry extinguishing equipment even during the suspension of the coke kiln discharging operation,
Automation of cutting amount setting has been achieved, the order to the control target inventory level in the pre-chamber red hot coke in the rest immediately before the kiln setting operation, inevitably coke cutting amount is controlled synchronously every greatly As a result, there is a problem that the thermal balance in the system is disturbed, which fluctuates the amount of generated steam and lowers the heat recovery efficiency. Also, depending on the target value of the stock level in the pre-chamber just before the stop of the kiln discharging operation, the red hot coke charging to the coke dry fire extinguishing equipment was concentrated immediately before the stop of the kiln discharging operation due to the variation of the kiln discharging operation time. The danger of the case is also conceivable.

Further, Japanese Patent Application Laid-Open No. 57-78482 discloses
The method shown is for coke cuttingOutputAlways constant
Is set and the actual coke offOutputBut
Errors occur due to differences in bulk density due to changes in
The coke level in the pre-chamber fluctuates,
inevitablyCokeSignificant change in cutting amount for each control synchronization
The thermal balance in the system is disturbed and the generated steam
It fluctuates the amount and promotes a decrease in heat recovery efficiency. Further
In addition, the method disclosed in Japanese Patent Application Laid-Open No.
The cooling tower charging speed of the hot coke is
In practice, it is necessary to set
Part of the coke breeze generated due to wear inside the tower
It is entrained by the circulating gas, and the primary dust remover and cyclone of the flue
Separated as coke breeze. Because of this, red
The cooling tower charging amount of hot coke and the cutting amount of cooling coke
It cannot be equal. Therefore, the cooling of red hot coke
If the tower charging speed is set as the cooling coke output,
Inevitably, the pre-chamber inventory will shift,
Even if it does, it is necessary to change the cutout amount frequently. Frequent
A change in the amount of cut is equivalent to a change in the speed of heat exchange.
Constant cutWarmingCondition (the maximum heat exchange possible)
Add maximum efficiency to cool coke to lower temperature
Under the required conditions), the amount of circulating gasChangeEtc.Need
Andas a resultThe disadvantage is that heat recovery efficiency is deteriorated.
You.

An object of the present invention is to solve the above-mentioned problems in a coke dry fire extinguishing system and to remove coke from a cooling tower.
To prevent significant changes in the output, it is to provide a cutting amount automatic control method of the coke dry quenching facility deterioration of heat recovery efficiency can be suppressed.

[0009]

Means for Solving the Problems The present inventors have conducted various tests and studies to achieve the above object. As a result, coke coke charging amount to the cooling tower dry quenching equipment, coke switching output and the pre-chamber coke levels from the cooling tower is measured and coke switching based on coke off volume from actually measured cooling tower It controls the volume setting value, co
The amount of coke charged during the period calculated for each coke level measurement
The difference between the measured amount of coke extracted from the cooling tower and
The apparent bulk density of coke in the pre-chamber and cooling tower is divided by the increase or decrease volume of the coke level in the chamber.
Determined by correcting the set coke cutting amount by using the bulk density, to control the coke level in the pre-chamber, eliminating the significant change operations of the coke switching output, and deterioration of the heat recovery efficiency can be suppressed We arrived at the conclusion and reached the present invention.

That is, the first invention of the present application is based on the planned amount of coke charged to the cooling tower of the coke dry fire extinguishing equipment.
Determines the configuration coke cutting amount, a method for automatically controlling the coke cutting amount from the cooling tower, measuring the coke cutting amount on coke conveyor, sets the coke cutting amount on the basis of the measured value In addition to controlling the amount of coke cut off , the coke level in the pre-chamber is measured at multiple points or continuously, and the charging is calculated during each measurement.
The difference between the amount of coke and the amount of coke
Divided by the increase / decrease volume of the coke level in the tank to obtain the apparent bulk density of the coke in the prechamber and the cooling tower,
This is a method for automatically controlling the cut-out amount of coke dry-type fire extinguishing equipment, wherein the set coke cut-out amount is corrected using the bulk density, and the coke level of the pre-chamber is controlled.

[0011] The second aspect of the present invention is set based on the planned charging coke amount of the cooling tower of the coke dry quenching facility
Determining a constant coke cutting amount, the coke cutting amount from the cooling tower in a method for automatically controlling the charging amount of coke per 1 kiln is measured, the charging amount of coke in the instrumentation Nyusumi amount of the kiln
Divide to obtain the latest coke yield, and divide the coke cut-off amount measured on the coke conveyor by the charged coke amount.
Calculate the coke yield in the coke dry fire extinguishing system
Plan by multiplying the actual amount of coal charged by the latest coke yield
The charged coke amount is determined, and the coke amount is added to the planned charged coke amount.
Kusu a cutting amount automatic control method of the coke dry quenching facility characterized by a next set coke cutting amount by multiplying the coke yield in a dry quenching facility.

[0012]

According to the present invention, on the coke conveyor.
In coke cutting amount was measured, from which controlling the coke cutting amount setting coke cutting amount based on the measured value, it is possible to accurately cut a predetermined amount of coke from the cooling tower, coke switching unloading it is possible to eliminate the significant changes the operation of the amount. In addition, the coke level in the pre-chamber was measured, and the amount of coke charged during that period was calculated for each measurement.
The difference with the coke cut-off amount.
Divided by increasing or decreasing the volume of the bell, and calculating the bulk density of apparent coke pre chamber and cooling tower, and corrects the setting coke cutting amount by using the bulk density, because controlling the coke level of the pre-chamber, setting coke cutting amount is <br/> properly corrected, it can control the coke level of the pre-chamber to a predetermined level, a significant change operation of the coke off volume
It can be the Without suppressing the deterioration of the heat recovery efficiency.

In the present invention, the cooling tower is
Measure the amount of coke charged in each kiln and divide the amount of coke charged by the amount of coal charged in the kiln to determine the latest coke yield
Of coke measured on the coke conveyor
Is calculated by calculating the coke yield in the coke dry fire extinguishing system by dividing the
Calculates the amount of coke to be charged by multiplying the yield
Coke in coke dry fire extinguishing system
Because the next set coke cutting the amount by multiplying the yield,
It is possible to improve the accuracy of predicting the planned charging coke amount and the set coke discharge amount into the cooling tower. Further, by making the setting coke cutting amount by using the coke yield in a plan loading amount of coke and the coke dry quenching facility to the cooling tower, you can accurately determine the setting coke switching output, coke switching volume without significant change operation it is possible to suppress the deterioration of the heat recovery efficiency.

[0014]

Embodiment 1 The details of the method of the present invention will be described below with reference to FIGS. 1 and 2 showing an embodiment. FIG. 1 is a schematic explanatory view of a coke dry-type fire extinguishing system for implementing the method of the present invention, and FIG. 2 is a system diagram of control of coke cutting from a cooling tower. In FIG. 1, reference numeral 1 denotes a cooling tower including a pre-chamber 2 and a cooling chamber 3,
Reference numeral 4 denotes a bucket truck, and 5 denotes a coke bucket loaded and moved on the bucket truck 4. Red-hot coke discharged from a coke oven (not shown) is loaded into the coke bucket 5 and moved to a hoisting position by the bucket truck 4, and is wound. The coke bucket 5 is wound up by the upper unit 6 and traverses over the pre-chamber 2, the charging lid 7 is opened, and red hot coke in the coke bucket 5 is charged into the pre-chamber 2.

Reference numeral 8 denotes a circulating inert gas injection port provided at a lower portion of the cooling chamber 3.
Heat exchanges with the coke descending inside the chamber, raises the temperature to about 800 ° C., and passes through a small flue that opens in the circumferential direction at the boundary between the prechamber 2 and the cooling chamber 3, and an annular flue 9 around the outer periphery of the prechamber 2 reaches the flue 10 from the heat recovery in the waste heat boiler 11 after being primary dust, after being re-dust in a cyclone 12, again from the lower portion of the circulating inert gas blowing port 8 of the cooling chamber 3 by a circulation blower 13 It is blown. 14 is a coke switching DeSo location provided in the bottom of the cooling chamber 3, the circulation until the inert gas and the heat exchange to about 200 ° C. cut the cooled coke, with conveyor 15 is configured to be conveyed to a subsequent step I have. 16 is a switching Deco chromatography click <br/> scan weigher provided on the transport conveyor 15, to measure the coke switching volume to be cut out in a coke switching DeSo location 14. 17 charging coke weigher consists of a load cell or the like provided on the hoisting machine 6, 18 in a continuous pre-chamber level gauge using microwaves or the like provided on the top of the pre-chamber 2, Prin chamber 2 Measure coke level continuously. 19, 20 in the pre-chamber level meter using gamma rays or the like, whether cut lower limit level by the pre-chamber level meter 19, to determine whether exceeds the upper level by the pre-chamber level gauge 20.

Next, a method for automatically controlling the amount of coke cut-off according to the present invention in the coke dry-type fire extinguishing equipment will be described with reference to FIG. First, when the coke kiln discharge work schedule of the day and the next day is registered in the kiln discharge schedule setting device 22 in advance, the coke charging amount calculator 21 transfers the coke discharge schedule from the kiln discharge schedule setting device 22 to the coke dry fire extinguishing equipment. plan charged calculates the coke amount, and outputs the coke switching volume Starring <br/> adder 24. The coke bulk density calculator 23
The coke is input from the switching Decorating Kusu weigher 16 switching
Output and charging coke input from charging coke weigher 17
The difference between the box volume, based-out Starring the variation of the pre-chamber coke level for each measurement which is input from the pre-chamber level gauge 18 and the pre-chamber level gauge 19, 20
Divided by increasing or decreasing the volume of calculation coke levels, determine the coke bulk density of the pre-chamber 2 and the cooling chamber 3, and outputs the coke switching output calculating unit 24. Coke switching output calculating unit 24, and actual coke bulk density input from the coke bulk density calculator 23, the coke level in the pre-chamber 2 from the planned charging coke amount input from the coke charging amount calculator 21 within a predetermined time, cut the number of coke switching DeSo location 14 be maintained within a predetermined level range, it is set by calculating a switching volume control. Further, coke switching output calculating unit 24, switching Deco Kusu against configured coke switching volume and the measured coke switching volume inputted from the weighing unit 16, sets the coke switching volume based on the difference coke It will be the amount of cutting
Cormorant be corrected.

[0017] Coke yield calculator 25 may store the actual charging coal amount which is charged to the kiln which is input from the higher of the computer 26 issues kiln from the kiln coke bucket 5 of the bucket truck 4 Then, the coke kiln discharge amount calculated by subtracting the tare of the coke bucket 5 from the total weight of the coke bucket 5 measured by the charged coke weighing device 17 of the hoisting machine 6 is divided by the charged coal amount to calculate the amount of each coke kiln. Is calculated and output to the coke charging amount calculator 21. Coke charging amount calculator 21, U at the next time of the coke oven out plan
In Kusu kiln out Shi amount prediction, coke on actual instrumentation Nyusumi amount
Yield plan charged coke amount Ru operations to <br/> to by multiplying the coke yield inputted <br/> coke dry quenching equipment from the arithmetic unit 25. This makes it possible to improve the prediction accuracy of planned charging coke amount. Further, the coke yield calculator 25
Is the actual coke cutting by the cut coke weigher 16
Actual charging coke the amount by charging coke weighed 17
Divided by the amount seeking coke yield in the cooling tower 1, and outputs the coke switching output calculating unit 24. Coke switching output calculating unit 24, instrumentation charging coke by entering coke weighing 17
The coke yield multiplied by the set coke <br/> scan switching output and to Rukoto in the cooling tower 1 to the amount, it is possible to reduce the deviation from the pre-chamber coke level objectives.

The elapsed time and the pre-chamber coke level from kiln out starting in the case of automatically controlling the coke off volume using the present invention the method described in Example 1, the pre-chamber inventory, coke switching volume The change in heat recovery efficiency was measured. The result is shown in FIG. The coke level in the pre-chamber was controlled so as to be 0% (lower limit) at the start of kiln discharge and 100% (upper limit) at the end of kiln discharge. For comparison, the elapsed time and the pre-chamber coke level from kiln out starting in the case where in response to the pre-chamber coke level controls coke switching volume as the conventional method, the pre-chamber inventory, coke switching volume The change in heat recovery efficiency was measured. FIG. 4 shows the results. The coke level in the pre-chamber was controlled so as to be 0% (lower limit) at the start of the kiln discharge and 100% (upper limit) at the end of the kiln discharge similarly to the method of the present invention.

[0019] As shown in FIG. 3, according to the invention method, the actual coke compares the switching output and setting coke switching volume with changes in the pre-chamber coke level in 20 minutes after the start of the kiln out, pre-chamber coke level There is a high level with respect to the target, since the higher the bulk density of the actual cut coke compared to the setting, and increases the coke switching volume by modifying the configuration coke switching output. Then, since the bulk density of the likewise pre-chamber coke levels and cut coke and 20 minutes after the kiln out start even 40 minutes after the start of the kiln out was high, increasing the coke switching volume by modifying the configuration coke switching volume Let me. Furthermore, at the time of 1 hour after the start of the kiln out, because that has deviated pre chamber inventory and pre chamber coke level, the recent coke pre chamber inventory amount setting coke switching volume <br/> intact bulk density I am reviewing it. And about 2 hours 5 after starting the kiln
Kiln delivery is completed in less than 0 minutes. Then, about 25 minutes after the kiln was taken out, the inventory of the pre-chamber was reviewed,
At the same time since the pre-chamber coke level was lower than the target, and decreases the coke switching volume by modifying the configuration coke switching output. Approx. 1 hour 30
After the elapse of the minute, the next kiln discharge is started again. Thus by comparing the measured value of the coke switching volume and configuration coke switching output, it is possible to increase the frequency of correction of the pre-chamber coke level or pre-chamber inventory, Ya pre chamber coke level improved pre chamber inventory accuracy, significant coke switching volume
The change operation can be eliminated .

[0020] As shown in FIG. 4, in the conventional method, since it is detected that the pre-chamber coke levels 1 hour after the start of the kiln out is high relative to the target, coke switching correct the configuration coke switching volume The output is rising.
Along with this, the heat recovery efficiency has been greatly reduced. Then continue to rise coke switching volume an elevated despite pre chamber coke level in 1 hour after the start of the kiln out, so have exceeded the upper limit at 2 hours and 30 minutes after the start of the kiln out, setting coke switching volume increases the coke switching volume Correct for about 2 hours and 50 minutes a little less than the kiln out after kiln out start continues operations until the end while the pre chamber coke level limit. Any coke switching volume by <br/> Rinetsu recovery efficiency changes is reduced here. In addition, 1
At a little over 10 minutes, the coke level in the pre-chamber was too low compared to the target.
Fixed volume and lowers the coke off volume and, again a substantial decrease in the heat recovery efficiency is observed. Also, about one hour and 30 minutes after the completion of the kiln discharge, the next kiln discharge was started again, but 10 minutes later the coke level in the pre-chamber was too high compared to the target, so it was set to correct it. Correct coke switching volume is increased coke switching volume <br/>. Conventional method for controlling coke switching volume thus corresponds to the pre-chamber coke levels, unless looking at the actual coke switching output, coke yield in the coke bulk density and coke dry quenching facility the variation, deviation occurs in the pre-chamber coke level of the control target, which lead to changes in coke switching output, and adversely affect the heat recovery efficiency.

As is clear from the comparison of the area of the hatched portion of the graphs showing the relationship between the elapsed time and the heat recovery efficiency in FIGS. 3 and 4, in the case of the method of the present invention shown in FIG. The decline has been greatly suppressed. In addition, in the case of the method of the present invention shown in FIG.
Correction of charged coke amount has not been implemented, since improved further prediction accuracy by practice of the method, the heat recovery efficiency of the coke dry quenching equipment can be stably maintained at high.

[0022]

As described above, according to the present invention, according to the present invention method, can control the pre-chamber coke level to a target level to prevent the error of the pre-chamber coke levels, fewer changes operation of the coke off volume As a result, the heat recovery efficiency can be stably maintained at a high level.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a coke dry-type fire extinguishing facility for carrying out the method of the present invention.

FIG. 2 is a system diagram of control of coke separation from a cooling tower.

[3] in the case of automatically controlling the coke off volume using the present invention method of Example 2, the elapsed time and the pre-chamber coke level from the kiln out starting, the pre-chamber inventory,
Coke switching output, which is a graph showing a relationship between a heat recovery efficiency.

[Figure 4] in the case of automatically controlling the coke off volume using conventional methods of Example 2, the elapsed time and the pre-chamber coke level from the kiln out starting, the pre-chamber inventory, coke switching output, heat recovery efficiency 6 is a graph showing a relationship with the graph.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cooling tower 2 Pre-chamber 3 Cooling room 4 Bucket truck 5 Coke bucket 6 Hoisting machine 7 Charging lid 8 Circulating inert gas inlet 9 Annular flue 10 Flue 11 Waste heat boiler 12 Cyclone 13 Circulating blower 14 Coke switching DeSo location 15 conveyor 16 cutting coke weighers 17 charging coke weighers 18 continuous pre chamber level gauge 19, 20 pre-chamber level gauge 21 coke charging amount calculator 22 kiln out scheduling unit 23 coke bulk density calculator 24 coke switching output calculating unit 25 coke yield calculator 26 Top computer

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takashi Mori 1850 Minato, Wakayama-shi, Wakayama Sumitomo Metal Industries, Ltd. Wakayama Works (56) References JP-A-2-103283 (JP, A) JP-A-59- 199490 (JP, A) JP-A-53-57201 (JP, A) JP-A-62-232484 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C10B 57/02 C10B 39 / 02 C10B 41/02 C10B 57/00 C10B 57/14

Claims (2)

(57) [Claims] 1. The cooling tower of a coke dry fire extinguishing systemplan
Based on the amount of coke chargedSettingCoke extraction amountDecision
To automatically control the amount of coke cut from the cooling tower
On the coke conveyorInLeaksCut outMeasure the quantity
And determine the amount of coke cut based on the measured value.Setting code
To cut-out amountControl and the code in the pre-chamber.
Measurement at multiple points or continuously, and
EveryCalculated coke charge and coke cutoff during that time
Is the difference in the coke level in the pre-chamber.
Divide by the product,Coke in prechamber and cooling tower
The apparent bulk density ofRequest, Its bulk densityAnd the previous bulk density
Set based on the difference betweenCoke cuttingThe amountCorrection, pre-chan
Coke characterized by controlling the coke level of the bar
Automatic control method of cut-off amount of dry fire extinguishing equipment. 2. Coke dry cooling system for cooling towerplan
Based on the amount of coke chargedSettingCoke extraction amountDecision
ICoke from the cooling towerAutomatic control of cutting amount
Measure the amount of coke charged for each kiln,
LeaksDivided by the amount of coal charged to the kiln
Seeking yield,Coke measured on coke conveyor
VolumeDivided by the amount of coke charged to dry-coke coke
Calculate the coke yield in the equipment and update the
The coke yield is multiplied to obtain the planned charging coke amount.
The planned amount of coke charged in the coke dry
Multiply coke yieldThe nextSettingCoke extraction amountWhenYou
Automatic cut-out amount of coke dry fire extinguishing equipment
Control method.