JPH0756024B2 - Carbon Distillation Defect Diagnosis Control System in Coke Oven - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for diagnosing a carbonization defective carbonization chamber in a coke oven and giving an action to the cause of the carbonization defective to a combustion control device.

[Conventional technology]

The quality of coke products depends not only on the composition and quality of the raw coal but also on the dry distillation process in the coke oven.

In order to keep the quality of products constant, an automatic furnace temperature control system for coke ovens has been proposed.

For example, "3rd Edition Iron and Steel Handbook, Volume II, P182,183,4 ・ 2.4
In the “Coke incident equipment” (edited by the Iron and Steel Institute of Japan), the flue temperature is set based on the target fire fall time and dwell time, the flue temperature is set by the detection end embedded in the upper part of the combustion chamber, and the gas generated in the riser section is set. It is disclosed that the flow rate of supplied fuel gas, gas calorie, and draft pressure are automatically controlled by ascertaining the fire fall time based on the temperature change situation and feeding it back.

[Problems to be Solved by the Invention]

However, such a conventional automatic control method has the following problems because no consideration is given to the poor dry distillation in each carbonization chamber consisting of about 100 chambers and the variation in the dry distillation between the carbonization chambers.

Differences in coke firing conditions between carbonization chambers due to distribution of gas amount between carbonization chambers and disruption of combustion balance result in variation in coke quality between carbonization chambers.

Differences occur in the charging conditions (charging density, water content, etc.) and coke oven operating conditions (drying time, storage time, etc.) for each coking chamber, resulting in variations in coke quality.

Disturbance of the temperature distribution in the carbonization chamber due to operating conditions and equipment problems affects coke quality and thermal efficiency of the entire coke oven.

With regard to gas amount distribution for each carbonization chamber and gas amount distribution for each combustion chamber in the carbonization chamber, the operator sees the operation data and makes an action determination, so there is a time delay, and a large amount of determination data induces a determination error, It also required a high degree of expertise.

Therefore, an object of the present invention is to solve the above problems.

[Means for Solving the Problems]

The present invention comprises an operation monitoring means, a plurality of operation data, processing data such as an average value of the operation data, and time-series data of the data is collected, and based on these data, the cause of the dry distillation failure of the coke oven is determined. Inferencing and determining the action amount of the combustion controller based on this inference result In a carbonization failure diagnosis control system in a coke oven, A: heating wall temperature data, generated COG gas temperature data, processing data of these data and time series data And the standard value set in advance, the dry distillation defective carbonization chamber for determining the dry distillation poor carbonization chamber and the dry distillation carbonization chamber for each of the dry distillation carbonization chambers determined by the means B: A are used to determine the cause of the preset dry distillation. For each of them, a certainty factor is attached to the flue unit of the coking chamber by reasoning, the certainty factor is corrected according to the tendency of each carbonization cycle, and the operation results are considered. Cause of carbonization failure that determines the cause and cause of carbonization failure based on the degree of confidence given to each cause of carbonization failure cause determined by the situation determination means for re-correcting the certainty factor and the means of C: B for each carbonization chamber Deciding means and D: Action points for the cause of carbonization failure determined by C means are determined in consideration of the balance between the carbonization chambers / carbonization chambers and E: Action points for the action points determined by D means It is a system for diagnosing carbonization failure in a coke oven that has means for calculating the power amount, displaying it on the CRT, and outputting the set value to the equipment whose settings can be controlled.

[Action]

In the present invention, by detecting a poor carbonization chamber in the coke oven and instructing an appropriate action to control the combustion controller, variation in coke quality is reduced, and coke having a constant quality and coke combustion thermal efficiency are obtained. Get better.

〔Example〕

Hereinafter, the present invention will be specifically described based on the embodiments shown in the drawings.

In FIG. 1, reference numeral 1 is a coke oven, into which coal is charged by a charging vehicle 2. The heating wall temperature and the generated COG gas in a large number of carbonization chambers in the coke oven are measured at regular time intervals by a process computer (not shown), and this data is input to the carbonization failure diagnostic device 3 for poor carbonization. The fire fall time (dry distillation time) is calculated based on the temperature change of the generated COG gas. The carbonization failure carbonization chamber diagnostic device 3 is set with a target value such as a fire fall time and a heating wall temperature, and diagnosis and detection of the carbonization failure carbonization chamber is performed based on the present value and the past value of the sensor data and the operation data for the target value. To do. The processing flow is shown in FIG.

Each step in FIG. 2 will be described.

・ Step 10 "Determination of carbonization failure carbonization chamber" Targeting all carbonization chambers, information from each carbonization chamber is received from the process computer, and whether the carbonization chamber is defective in carbonization is compared with the target value. Determined by Judgment items include "whether the fire time and heating wall temperature for each coking chamber are outside the target values", "whether the average firing time for the working kiln is outside the target values", and "fire for each coking chamber""Is the falling time outside the target value?", "Is the heating wall temperature of the working kiln forward average outside the target value?", "Is the taper of the heating wall temperature of the carbonization chamber outside the target value?", Etc. is there. If any of these items are applicable, it is judged as a carbonization chamber with poor carbonization.

・ Step 20 "Judgment of completion of all carbonization chambers" It is checked whether the judgment is completed for all carbonization chambers.

Step 30 “Determination of cause of poor carbonization in carbonization chamber” In the determination of carbonization defective carbonization chamber in step 10, the cause of poor carbonization is searched for in the carbonization chamber determined to be poor carbonization. There are the following items to search for the cause of poor carbonization.

 Is there a dropout of the orifice?

Regarding the heating wall temperature corresponding to consecutive flues in the same flue row, when the difference between the heating wall temperature and the target taper is larger than the comparison value, data with a high degree of certainty is given to the item of orifice loss. Similar processing is performed for all flues this time.
Last time, perform the carbonization cycle two times before.

This is because when the orifice drops out, the air ratio of the relevant flue changes significantly, the flue temperature changes abnormally, and the heating wall temperature also changes abnormally accordingly. Because it exceeds the value.

 Is there a jam in the orientation card?

Regarding the heating wall temperature corresponding to consecutive flues in the same flue row, when the difference between the heating wall temperature and the target taper is smaller than the comparison value, data with a high degree of certainty is given to the item of orifice clogging. Similar processing is performed for all flues this time.
Last time, perform the carbonization cycle two times before.

This is because when the orifice is clogged, the air ratio of the relevant flue changes significantly, the flue temperature changes abnormally, and the heating wall temperature also changes abnormally accordingly. Because it is less than.

Baking coal segregation Regarding the heating wall temperature corresponding to continuous flues in the same flue row, when the difference between the heating wall temperature and the target taper is smaller than the comparison value, data with a high degree of certainty is given to the item of the forming coal segregation. The same treatment is carried out for all the flues this time, last time, and the last two times of the carbonization cycle.

This is because, when segregation of the briquette causes an excessive and insufficient heat absorption from the heating wall and an abnormal change in the heating wall temperature, the difference from the target taper is less than the comparison value.

 Is there any getter dirt?

Regarding the heating wall temperature corresponding to consecutive flues in the same flue row, when the difference between the heating wall temperature and the target taper is smaller than the comparison value, data with a high degree of certainty is given to the item of getter stain. The same treatment is carried out for all the flues this time, last time, and the last two times of the carbonization cycle.

This is because when the getter gets dirty, the air ratio of the relevant flue changes significantly, the flue temperature changes abnormally, and the heating wall temperature also changes abnormally.
This is because the difference from the target taper is less than the comparison value.

 Are there any small dampers unsuitable?

Regarding the heating wall temperature corresponding to consecutive flues in the same flue row, when the difference between the heating wall temperature and the target taper is larger than the comparison value, data with a high degree of certainty is given to the item for which the small damper is not suitable. Similar processing is performed for all flues this time.
Last time, perform the carbonization cycle two times before.

This is because if the small damper is not appropriate, the suction balance of the combustion gas in the furnace length direction will be disrupted and the flue temperature will change abnormally.
Along with this, a phenomenon in which the heating wall temperature also changes abnormally appears, and the difference from the target taper is less than the comparison value.

 Is there coke rush?

Regarding the heating wall temperature corresponding to consecutive flues in the same flue row, when the difference between the heating wall temperature and the target taper is larger than the comparison value, data with a high degree of certainty is given to the item of coke squeezing. The same treatment is carried out for all the flues this time, last time, and the last two times of the carbonization cycle.

This is because if the charged coal is biased toward the furnace length direction, the heat absorption from the heating wall becomes excessive and deficient, and the temperature of the heating wall changes abnormally, so the difference from the target taper is less than the comparison value. Because.

 Is there a defective fire sensor?

Regarding the temperature of the generated gas during carbonization in each carbonization chamber, when the rate of change of the generated gas temperature is higher than the comparison value, data with a high degree of certainty is given to the item of the fire sensor failure. The same treatment is performed for all carbonization chambers this time, last time, and before and after the carbonization cycle.

This is because the generated gas temperature sharply decreases when the fire sensor is exposed to the low water, and the generated gas temperature rises sharply when the high temperature is not applied, and the rate of change of the generated gas temperature is larger than the comparison value. Because it will be.

 Is there a base clogging?

Regarding the burn-down time for each carbonization chamber, when the average burn-down time in the work kiln order is larger than the comparison value, data with a high degree of certainty is given to the item of base clogging. The same treatment is performed for all carbonization chambers this time, last time, and before and after the carbonization cycle.

This is because if the riser pipe base of each carbonization chamber is clogged, the generated gas flow rate is reduced, the carbonization rate is obstructed, and the fire fall time becomes longer than the comparison value.

 Is there a defective instrument?

Regarding the heating wall temperature for each carbonization chamber, when the average heating wall temperature in the order of the working kiln is smaller than the comparison value, data with a high degree of certainty is given to the item of instrument failure. The same treatment is performed for all carbonization chambers this time, last time, and before and after the carbonization cycle.

This is because if the heating wall temperature sensor becomes dirty with coke powder or the like, the heating wall temperature measured over many carbonization chambers becomes smaller than the comparison value.

-Step 40 "Trend determination" The time series tendency is determined by the total certainty factor of the certainty factor given for each dry distillation cycle with respect to the cause factors of the dry distillation problem from step 30 to. An example of this processing is shown in FIG.

・ Step 50 “Situation determination” Further consider the operation results and further adjust the overall confidence level for each cause of carbonization failure. An example of this processing is shown in FIG.

Step 60 “Tentative determination of cause of poor carbonization” Ranks according to the overall confidence given to each cause of poor carbonization, and temporarily determines the cause of poor carbonization as the cause of poor carbonization.

An example of this processing is shown in FIG.

・ Step 70 “Determination of cause of poor carbonization” If the comprehensive certainty factor of the temporarily determined cause of poor carbonization is equal to or higher than the comparison value, this is the final decision.

If it is less than the comparison value, it is judged that there is no specific cause of poor dry distillation, and the orifice diameter is adjusted.

An example of this processing is shown in FIG.

・ Step 80 “Determination of action points” Determine points to be corrected and points to be adjusted in order to balance the inside and inside of the carbonization chamber.

An example of this processing is shown in FIG.

・ Step 90 "Determination of action method" The finally determined cause of defective distillation and defective location are marked for each carbonization chamber and used as output information.

An example of this processing is shown in FIG.

This information is transferred or transmitted to the defective kiln control amount calculation device 4 in FIG.

In the defective kiln control amount calculation device 4, based on the received information, the combustion controller 5, that is, the opening / closing cock opening, the small downper opening,
Calculate the action amount of the orifice diameter. As an example of the calculation method, in the case of a control cock, the deviation from the average of the furnace group is calculated for the heating wall temperature and the fire fall time, and the points are converted taking into account the influence coefficients of both adjacent carbonization chambers. An overall score is obtained by adding the weighting factors of the heating wall temperature and the fire fall time to these points. The total score is modified from the total score and the action history of the past several cycles to make this total score. The total score this time is taken as the action amount according to the adjustable cock action amount conversion table. If the action amount cannot be determined, the process moves to the orifice diameter action. The influence coefficient, the weighting coefficient, the point conversion, etc. are created based on the past operation record and experience. The same operation is performed for the small damper opening and the orifice diameter. The obtained action amount is displayed on the CRT, and if the equipment is capable of setting control, the setting control is monitored by the process computer, and if the equipment is not capable of setting control, the action instruction is output to the book and operated manually.

Fig. 9 shows changes in carbonization variation according to the present embodiment, Fig. 10 shows a furnace wall temperature (heating wall temperature) burndown time defect map, Fig. 11 shows action amount instructions, and Fig. 12 shows a form output example of the adjustable cock action guide. Shown in the figure.

〔The invention's effect〕

As described above, the present invention has the following effects.

Distribution of gas amount in each carbonization chamber and collapse of combustion balance in each carbonization chamber are reduced, and variation in coke quality between carbonization chambers is reduced.

The difference between the charging conditions (charging density, water content, etc.) and coke oven operating conditions (total carbonization time, storage time, etc.) for each carbonization chamber is reduced, and the coke quality variation is reduced.

Disturbance of temperature distribution in the carbonization chamber due to operating conditions and equipment problems is reduced, and coke quality and thermal efficiency of the entire coke oven are improved.

The gas amount distribution for each carbonization chamber and the gas amount distribution for the combustion chamber in the carbonization chamber are automatically calculated and action determination is performed, so there is no time delay, no misjudgment is induced, and highly specialized knowledge. Does not even need.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flow chart showing an outline of a process of diagnosing a defective carbonization chamber according to the present invention, and FIGS. 3 to 8 are flow charts showing details of each process. . 9 to 11 show output examples of this system,
FIG. 12 is a diagram showing a form output example of the adjustable cock action guide. 1: Coke oven 2: Charging vehicle 3: Defective carbonization chamber diagnostic device 4: Defective carbonization chamber control amount calculation device 5: Combustion controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nakazaki Showa 1-1 No. 1 Tobata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka Prefecture Inside Nippon Steel Co., Ltd. Hachiman Works (72) Masamitsu Kikuchi, Tobata-ku, Tobata-ku, Kitakyushu, Fukuoka Prefecture No. 1-1 Machi Nippon Steel Co., Ltd. Inside Yawata Works (56) References JP-A-1-304180 (JP, A) JP-A-1-278596 (JP, A) JP-A-63-248888 (JP , A) JP 63-248887 (JP, A) JP 58-154789 (JP, A) JP 62-177094 (JP, A) JP 56-115384 (JP, A)

Claims (1)

[Claims] 1. A plurality of operation data, comprising operation monitoring means,
Processing data such as the average value of the operation data, and time-series data of the data are collected, and based on these data,
In a carbonization failure diagnosis control system for a coke oven that infers the cause of carbonization failure of the coke oven and determines the action amount of the combustion controller based on this inference result, A: heating wall temperature data, generated COG gas temperature data, these data The dry distillation defective carbonization chamber judgment means for determining the dry distillation defective carbonization chamber by comparing the processing data and time series data of B with the preset reference value and the cause of the dry distillation poorness for each dry distillation carbonization chamber determined by the means B: A. For each of the preset judgment items, a certainty factor is attached to the flue unit of the coking chamber by inference, the certainty factor is corrected by the tendency of each carbonization cycle, and the certainty factor is re-considered in consideration of the operation results. Determine the cause and cause of carbonization failure based on the degree of certainty given to each cause factor of carbonization failure determined for each carbonization chamber by the status determination means to be corrected and the means of C: B. Action point determination means and the action point determined by E: D means for determining the action points for the cause of dry distillation failure determined by the means for determining the cause of residue failure and D: C An apparatus for diagnosing carbonization problems in a coke oven, which has means for calculating the amount of action to be taken, displaying it on the CRT, and outputting the set value to the equipment whose settings can be controlled.