JP2872343B2 - Prediction method of fire time of coke oven - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for estimating a burn-out time of a coke oven, and more specifically, a time required to complete the generation of coke in a coke oven where coal is carbonized, that is, a so-called fire. The present invention relates to an improvement in a method for automatically and accurately predicting a falling time.

[Conventional technology]

Generally, in a coke oven, raw coal is sequentially charged into a plurality of carbonization chambers adjacent to each other, and
A carbonization treatment is performed at a high temperature of about 1100 ° C., and after the completion of the carbonization operation and, consequently, the production of coke, the coke generated from each carbonization chamber is sequentially extruded using an extruder. Prior to this, it is necessary to determine whether or not the carbonization of the coal to be treated in each carbonization chamber has been completed.

Conventionally, the determination of the burn-off time in this type of coke oven is usually performed by a skilled person of a coal dry distillation operation called "Himi". During the carbonization of the raw coal, open the top cover of the gas riser of the coke oven and observe the color of the gas released from the gas riser to the outside. Was used to determine the time of fire.

However, the determination of the burn-out time by the "fire watching" means, that is, the determination of the fire-burning time performed by observing and determining the color of the gas released from the gas riser requires sufficient skill, and is not necessarily required. Accurate judgment cannot be expected, and in the case of such artificial judgment means, in order to effectively increase the judgment accuracy, it is inevitable to perform visual judgment by opening the top cover of the gas riser. The frequency must be increased and not only requires a great deal of labor, but also every time the top cover is opened, the generated gas is released and leaked to the outside due to this. There are inconveniences such as deterioration of the environment, an increase in the loss of generated gas as an energy source, and a decrease in the quality of the generated coke.

Therefore, the present inventors, as one means for theoretically improving such disadvantages, first described in Japanese Patent Laid-Open No. 58-14128.
No. 7 proposes a method for determining a burn-out for determining a burn-out time based on a gas temperature generated in a gas riser in a coke oven. Meanwhile, Japanese Patent Publication No. 62-56197
In Japanese Patent Laid-Open Publication No. H11-264, there has also been proposed a method for predicting a fire that applies the method for determining a fire.

[Means for solving the problem]

However, in the case of the method for judging the burn-out time in a coke oven disclosed in Japanese Patent Application Laid-Open No. 58-141287 proposed by the present inventors, the fire-burning point at which the carbonization of the charged coal is completed is judged. However, there is a disadvantage that it is not possible to predict the time of the burnout before the dry distillation of the charged coal is completed, and in the case of the method of determining the burnout time according to Japanese Patent Publication No. 62-56197, There is a problem that the burn-out time cannot be predicted with high accuracy because it is a means for calculating the burn-out time based on the absolute temperature of the generated gas.

The present invention has been made in order to solve such a conventional problem, and its purpose is to be able to automatically and accurately predict the burn-out time when coke generation is completed. It is an object of the present invention to provide a method for predicting the fire time of a coke oven.

[Means for solving the problem]

As a result of research and development by the present inventors, the change over time of the gas temperature generated during carbonization of the raw coal during the production of coke, from the temperature range at the time of charging, becomes a substantially averaged temperature. After reaching the maximum temperature once through the temperature range,
There is a close relationship between the time X until the temperature falls to the substantially horizontal temperature range again and the burnout time Y when the coke generation is completed. In this case, the relational expression Y = aX + b (where a , b are constants determined by the charging conditions such as the furnace type, operating temperature, charged coal moisture, and charged coal amount).

Therefore, in the method for predicting a fire time of a coke oven according to the present invention, the constant
a and b are calculated in advance, and the generated gas temperature at the time of burnout is calculated from the average gas temperature in the substantially horizontal temperature range, and the required burnout time is predicted before the completion of coke generation. It was made.

That is, the present invention measures the temperature of gas generated during carbonization of raw coal by using a temperature measuring means provided in a riser or a riser bend portion of the coke oven in a coke oven for obtaining coke by carbonization of coal. Then, the gas temperature change with time in advance, from the temperature range at the time of charging of the raw coal, through a horizontal temperature range to be substantially averaged temperature, after rising to the maximum temperature, again averaged A relational expression between the time X required to fall to the temperature range and the burn-out time Y at which coke generation is completed Y = aX + b where a and b are the furnace type, operating temperature and charged coal moisture, and the charged coal quantity. Constants determined according to charging conditions such as the above, the temperature of the gas generated during carbonization is sequentially measured by the temperature measuring means, and the average temperature in the substantially horizontal temperature range is calculated. Fire from temperature based on the above relational expression A fire fall time prediction method of the coke oven, characterized in that it has adapted to predict the time in advance.

[Action]

According to the method of the present invention, in the production of coke, the change over time in the gas temperature generated during the dry distillation of the raw coal is changed from the temperature range at the time of charging to a horizontal temperature range in which the temperature is substantially averaged. After that, once the temperature reaches the maximum temperature, a relational expression Y = aX + b is established between the time X until the temperature falls to the substantially horizontal temperature range again and the burnout time Y when the coke generation is completed.
(Where a and b are furnace type, operating temperature and charged coal moisture,
In consideration of the fact that the constants determined by the charging conditions such as the amount of coal charged, etc.), the constants a and b of the same equation are obtained in advance, and the average gas temperature in the substantially horizontal temperature range is calculated based on the average gas temperature at the time of the fire. By calculating the gas temperature, it is possible to very easily and accurately predict the required time point of the fire after the completion of the coke generation.

〔Example〕

Hereinafter, an embodiment of a method for estimating a burn-out time of a coke oven according to the present invention will be described in detail with reference to FIGS. 1 to 3.

FIG. 1 is a sectional view schematically showing a main part of a coke oven to which one embodiment of the present invention is applied.

In the configuration of the coke oven shown in FIG.
Is a carbonization chamber of a coke oven, and 2 is a riser for taking out gas generated in the carbonization chamber 1. A top cover 3 is covered on the top of the riser 2 so as to be openable and closable. In order to measure the temperature of the generated gas obtained through the riser pipe 2 in the bend part 4, a bend part 4 is disposed so as to communicate with the gas collecting pipe 5. For example, a temperature measuring means 6 composed of a thermocouple or the like is provided.

Here, the temperature measuring means 6 is attached to the bend portion 4 in this manner.
The reason for providing is that when the temperature of the generated gas is measured, the bend portion 4 has a more stable gas temperature than that in the riser 2, and has a substantially horizontal temperature range in the time-dependent change of the gas temperature described later. This is because the temperature can be grasped with even higher accuracy, but the provision of the temperature measuring means 6 in the riser tube 2 is not prevented if necessary.

Then, using the coke oven shown in FIG. 1 described above, after charging the raw coal into the dry distillation chamber 1, the gas temperature generated before the time of the burnout is measured sequentially with time. , A temperature change as shown in FIG. 2 can be measured. That is, the temperature of the generated gas first rises rapidly with a steep temperature gradient within a relatively short time after charging the raw coal into the carbonization chamber 1 of the coke oven, and then the temperature gradient gradually increases. With a gradual and short-term rise in temperature, the temperature reaches a substantially horizontal and linear temperature gradient, that is, _a horizontal temperature range A due to a substantially averaged temperature Ta. This horizontal temperature range A is maintained for a relatively long time. Then, when the expiration of the horizontal temperature zone A, generated gas temperature rises again Yaゝrapidly, after once reaching a maximum temperature point B due to the temperature T _b within a relatively short time, this time subsequently initially the temperature was lowered rapidly and linearly, in which descends through the temperature T _a point again the horizontal temperature range a, filed in the temperature region portion after the lapse of the temperature T _a point in the linear temperature lowering zone In this case, there is a time point C at which the fire falls due to the temperature T, which is the purpose of this procedure.

Therefore, during the carbonization operation of the charged raw coal, any of the generated gas temperature T at the above-mentioned burn-down time point C or the elapsed time Y after coal-burning at the burn-out time point C can be confirmed in advance. Then, the time point at which the carbonization of the raw coal ends, and thus the time point C at which the intended coke generation is completed, can be easily predicted before the completion of the coke generation.

Further, according to the results of the earnest study by the present inventors, the change with time of the generated gas temperature during the carbonization operation is substantially equalized from the temperature range at the time of charging the raw coal to the temperature T. through the horizontal temperature zone a to be _a, once after reaching the maximum temperature T _b, until descends substantially horizontally temperature range a again time X
There is also a close relationship between the burn-off time Y and the completion of coke formation, where the relational expression Y = aX + b, where a and b are the furnace type, operating temperature and coal moisture It was found that the constants determined by the charging conditions such as the amount of coal charged were satisfied.

For this reason, if the constants a and b of the above relational expression are obtained in advance by preliminary operation or the like, during actual operation,
From the average gas temperature T _a at substantially horizontal temperature zone A, and obtained easily calculating the generated gas temperature T in the fire fall time in the operation, it is possible to predict the fire fall time C of interest very easily is there.

In Matakoko, the third figure, as each time X relative to the average temperature T _a of the generated gas in the substantially horizontal temperature range A, but are shown the relationship between Y, it is evident from the figure, in this embodiment method, the average gas temperature T _a at substantially horizontal temperature range a, since a generated gas temperature in the region of relatively stable state close to the end of the dry distillation initial, variation in temperature is very low For this reason, it is possible to more accurately predict the time of a fire.

〔The invention's effect〕

As described in detail above, according to the method of the present invention, during the production of coke, the change over time in the gas temperature generated during carbonization of the raw coal was substantially averaged from the temperature range at the time of charging. After the temperature reaches the maximum temperature once through the horizontal temperature range where the temperature reaches the maximum temperature and then falls to the substantially horizontal temperature range again, and the burn-out time Y when the coke generation is completed, the relational expression Y = In view of the fact that aX + b (where a and b are constants determined by the furnace type, operating temperature and charging conditions such as charged coal moisture and charged coal quantity) is satisfied, the constants of the same equation must be satisfied in advance.
a and b are determined, and during the carbonization operation, by means of simply measuring the temperature of the generated gas, the fire is dropped from the average gas temperature in the substantially horizontal temperature range before the completion of coke generation. It is possible to easily calculate the temperature of the generated gas at the time point and, consequently, the burn-out time itself. As a result, the required burn-out time can be predicted very easily. Unlike means for opening the cover frequently and observing the color of the generated gas, it requires appropriate skill, does not cause environmental pollution due to release of the generated gas, does not lose energy, and leads to deterioration in the quality of produced coke It has advantages such as fearless,
It has excellent features such as highly accurate prediction.

[Brief description of the drawings]

FIG. 1 is a sectional view schematically showing a main part of a coke oven to which one embodiment of the present invention is applied, FIG. 2 is an explanatory view showing a relationship between an elapsed time after coal charging and a generated gas temperature. FIG. 3 is a graph showing the prediction of the burn-off time used for averaging the generated gas temperatures from 3 hours to 9 hours after coal charging. 1 ... carbonization chamber of coke oven, 2 ... riser pipe, 3 ... top cover, 4 ... bend section, 5 ... gas collecting pipe, 6 ...
Temperature measurement means (such as thermocouples). A: substantial horizontal temperature range, B: maximum temperature point, C: time of fire.

Claims (1)

(57) [Claims] In a coke oven for producing coke by subjecting coal to carbonization, the temperature of gas generated during carbonization of raw coal is measured by temperature measuring means provided in a riser or a riser bend of the coke oven. Measured, the time-dependent change of the generated gas temperature in advance, from the temperature range at the time of charging the raw coal, through a horizontal temperature range that becomes substantially averaged temperature, to rise to the highest temperature, then again , A relational expression between the time X until the temperature falls to the average temperature range and the burn-out time Y at which the coke generation is completed Y = aX + b where a and b are the furnace type, operating temperature and charged coal moisture, and charged. A constant determined according to the charging conditions such as the amount of coal is determined in advance, and the temperature of the generated gas during the dry distillation is sequentially measured by the temperature measuring means to calculate an average temperature in the substantially horizontal temperature range. Based on the calculated temperature, Fire drop time prediction method of the coke oven, characterized in that it has adapted to predict Chi time in advance.