JPH061981A - Method for predicting volume of produced gas in coke oven - Google Patents

Abstract

PURPOSE:To accurately predict the volume of produced gases in fluctuation of an interval for block units in coke pushing operation of a coke oven according to a specific method. CONSTITUTION:The fluctuation in volume of produced gases with the elapse of time during a period from charging of coal to discharging of coke in respective carbonization chambers of a coke oven battery composed of the many carbonization chambers is initially computed and estimated from the amount of the charged coal, coal volatile content, holding time and dry distillation time. The volume of the produced gases in the coke oven battery is then predicted by utilizing the fluctuation in the volume of the produced gases with time. The computation of the fluctuation in the volume of the produced gases with time is carried out by utilizing the phenomenon that the fluctuation in the volume of the produced gases is proportional to the volatile content and amount of charged coal regardless of the elapsed time of dry distillation. When the holding time fluctuates from the reference value (HA) to (HB), the timing of the volume of the produced gases is horizontally displaced in proportion to the time of only carbonization. Furthermore, when the dry distillation time fluctuates from the reference value (KA) to (KB), the timing of the volume of the produced gases is preferably horizontally displaced in proportion to the time of only the carbonization and the volume of the produced gases is preferably made inversely proportional to the time of only carbonization (KB/KA).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for predicting the gas generation amount of a coke oven cluster having a large number of carbonization chambers.

[0002]

2. Description of the Related Art In a chamber furnace type coke oven, a carbonization chamber and a combustion chamber are alternately arranged above a heat storage chamber, and the charging coal charged in the carbonization chamber is passed from the combustion chambers on both sides through a furnace wall. It is heated to dry distillation and coke. In the coke oven, one furnace group is formed in several tens to hundreds of kilns, and the discharge of coke from the carbonization chamber and the kiln removal work for carbonizing the carbonization chamber are batches, but the interval is usually It is set to be roughly constant according to the operating rate, and operations are carried out so that the total amount of combustion gas is constant.

A large number of measurement examples of the time-dependent change in the amount of gas generated from the charging of coal to the end of carbonization have been published in one of the carbonization chambers of the above coke oven. The amount generated fluctuates considerably over time. That is, immediately after carbonization, a large amount of gas is generated by the rapid and rapid carbonization of coal on the side of the carbonization chamber wall, and a peak appears because hydrogen is released at the generated gas temperature of 700 to 800 ° C. in the latter half of carbonization. . However, the firing interval of the coke oven is set to be approximately constant according to the operating rate, and therefore the total amount of gas generated from the coke oven cluster can be considered to be substantially constant over time.

On the other hand, the kiln removal work of the coke oven is 3 straight 4
Since the system is carried out by the shift system, the kiln discharge interval often changes greatly due to a direct shift, a trouble repair of the coke oven moving machine, a facility trouble of the gas suction system, or the like. When the firing interval of the coke oven fluctuates significantly, the amount of gas generated from the coke oven group fluctuates significantly over time, which not only gives a non-uniform load to the gas purification process in the subsequent process, but also the coke oven gas. This will cause a great deal of inconvenience to the factories that use fuel as fuel. However, it is very difficult to accurately grasp the variation with time of the gas generation amount.

Predict gas generation from the coke oven
As a method of estimation, the change over time in the total amount of gas generated from the coke oven cluster, which is calculated based on the change over time in the amount of gas generated from the start of coal charging in each carbonization chamber to the discharge of coke in the arithmetic unit, was used. By inputting a series of calculation formulas that can express the above, the calculation time of the coal charging time in each of the carbonization chambers, the expected charging time in the future, and the time when it is desired to detect and predict the total amount of gas generated from the coke oven cluster is calculated. By inputting into the device, the total amount of gas generated from the coke oven cluster at the desired detection / prediction time is calculated and output (Japanese Patent Laid-Open No. 57-121088). An equation showing the amount of gas generated from the coke furnace group, which is calculated based on the change over time in the amount of gas generated from the charging to the discharge of coke, and the actual total amount of gas generated in the past and the amount of gas generated in the past. Each time the total gas generation amount is predicted by the formula for estimating the total gas generation amount prediction error based on the amount prediction value, the new amount of coal charged and the total gas generation amount measurement value are added to each of the above formulas while sequentially correcting the total gas generation amount. (Japanese Patent Laid-Open No. Hei 1-98693), or an approximate expression of the gas generation pattern, a first stage 2 hours before the burn down from the coal charging, and a second stage 2 hours before the burn down to the burn down. , Is summarized in three equations in the third stage from the fall of the fire to the kiln removal, and in the estimation calculation of the gas generation amount, correction is made according to the amount of oxygen contained in the coal (Japanese Patent Laid-Open No. 2-102292). ) Etc. have been proposed.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The method disclosed in Japanese Patent No. 1088 discloses a series of time-dependent changes in the total amount of gas generated from a coke oven cluster based on changes in the amount of gas generated from the charging of coal to the discharge of coke in each carbonization chamber. In the calculation formula, the coal charging time into each coking chamber, the expected charging time in the future, and the time at which it is desired to detect and predict the total amount of gas generated from the coke oven corps are input and calculated, and fluctuations in operating conditions and Satisfactory forecasts cannot be made because factors that affect the amount of various gases generated, such as the properties of charged coal, are not added.

Further, the method disclosed in JP-A-1-98693 is based on the amount of coal charged in each carbonization chamber and the change over time in the gas generation amount from the charging of coal to the discharge of coke. The total amount of gas generated from the coke oven group required
Prediction is performed using an equation that estimates the difference between the past actual value and the predicted value, and each time it is corrected by adding a new amount of coal charged and the measured value of the total amount of gas generated, no change in operating conditions is taken into consideration. However, it is difficult to predict a sufficiently satisfactory total gas generation amount.

Further, the method disclosed in Japanese Patent Application Laid-Open No. 2-102292 summarizes the approximate formula of the gas generation pattern into three formulas, and corrects the estimated amount of gas generation according to the amount of oxygen contained in coal. The method described in JP-A-1-98
Similar to the method disclosed in Japanese Patent No. 693, fluctuations in operating conditions are not taken into consideration, and it is difficult to predict a sufficiently satisfactory total gas generation amount.

An object of the present invention is to accurately predict the gas generation amount of a coke oven cluster by performing the gas generation amount during interval fluctuations within a block unit in the coke oven kiln removal work almost accurately in a short time. It is to provide a method of predicting the amount of gas generated.

[0010]

[Means for Solving the Problems] The inventors of the present invention have conducted earnest research to achieve the above object. As a result, as factors affecting the amount of gas generated from each carbonization chamber, volatile matter of the coal to be charged, carbonization amount and carbonization time such as carbonization time, storage time, etc. are considered. According to the actual furnace test under various conditions, the fluctuation of the gas generation amount due to the fluctuation of the coal volatile matter and the coal charging amount is proportional to the volatile matter and the coal charging amount regardless of the dry distillation elapsed time, The fluctuation of the gas generation amount can be achieved by horizontally moving the timing of the gas generation amount during the dry distillation elapsed time in proportion to the standing time.The fluctuation of the gas generation amount due to the change of the dry distillation time depends on the timing of the gas generation amount during the dry distillation elapsed time. The present invention has been accomplished by moving horizontally along with the fire fall time and by making the gas generation amount proportional to the fire fall time.

That is, according to the present invention, the amount of gas generated from the coke oven cluster is calculated based on the change over time in the amount of gas produced from the charging of coal to the discharge of coke in each carbonization chamber of the coke oven cluster consisting of a large number of carbonization chambers. In the method of calculating and predicting the above, the temporal change in the gas generation amount of each carbonization chamber is calculated and estimated from the coal charging amount, the coal volatile matter, the set time and the carbonization time, and the estimated gas generation amount of each carbonization chamber is changed over time. Fluctuations are used to predict the amount of gas produced by the coke oven cluster.

[0012]

[Operation] The coke oven kiln removal work is usually carried out in block units with 5 kiln pitches as one block,
Generally, the intervals between blocks are set to be almost constant. Therefore, the interval of the kiln removal work is often changed in each block, but it may be changed in the middle of the block, and the gas generation amount varies greatly. In order to calculate the temporal variation of the gas generation amount of each carbonization chamber in the present invention from the coal charging amount, the coal volatile matter, the set time and the carbonization time, when the coal charging amount is increased from the reference value A to B, for example, FIG. As shown in, the gas generation amount in the dry distillation elapsed time (i) is approximately a in proportion to the amount of coal charging.
To b. Further, the coal volatile matter is, for example, the reference value V.
_When changing from _A to V _B , as shown in FIG. 2, a gas generation estimation formula (k ₁ V _B + k ₂ / k _{1 VA} + k ₂₎ , where k _{1 is} a coefficient of volatile matter and k _{2 is a} constant. ). Further, when the set time is extended from the reference value H _A to H _B , for example, the timing of the gas generation amount may be horizontally moved in proportion to the fire fall time, as shown in FIG. Furthermore, when the dry distillation time is extended from the reference value K _A to K _B , for example, as shown in FIG. 4, the timing of the gas generation amount is horizontally moved in proportion to the fire fall time, and the gas generation amount is changed to the fire fall time K. It should be inversely proportional to _B / K _A.

The coal charging amount, coal volatile matter, coal volatile matter, coal volatile matter, coal volatile matter, coal volatile matter, coal volatile matter
By determining the standard conditions for the standing time and the dry distillation time, it becomes possible to accurately predict the gas generation amount under the arbitrary dry distillation time under various conditions. Therefore, the time-dependent fluctuation of the gas generation rate due to the change of the kiln discharge interval in the middle of the block can be quickly and accurately determined as a whole by calculating and estimating the gas generation amount of each carbonization chamber in the kiln discharge block. The amount of gas generated can be predicted.

[0014]

[Example] Furnace height 7125 mm, furnace width 460 mm, furnace length 1
In a coke oven cluster with 72 carbonization chambers of 6500 mm, when changing the interval of the firing delay of 2 hours in the firing block during the operation with the burn down time of 20.9 hours and the operating time of 2.0 hours, Estimate the time-dependent change of the gas generation amount of each coking chamber, and predict the time-dependent change of the gas generation amount of the coke furnace group based on this, and measure the actual value. did. The result is shown in FIG. As shown in FIG. 5, the gas generation amount shown by the broken line predicted by the method of the present invention agrees well with the actual value shown by the solid line, and sufficiently corresponds to the change of the kiln discharge interval in the middle of the block.

[0015]

As described above, according to the method of the present invention, the variation with time of the gas generation amount generated from each carbonization chamber can be
By accurately calculating and estimating based on the coal loading amount, the coal volatile matter to be charged, the set time and the dry distillation time, it is possible to predict the change over time in the gas generation amount with respect to changes in the kiln discharge interval during the kiln discharge block, It can be carried out quickly and with high precision, can prevent uneven load from being applied to the gas purification process in the subsequent process, and does not cause much trouble to the factory that uses coke oven gas as fuel.

[Brief description of drawings]

FIG. 1 is a graph showing a change over time in a gas generation amount when a coal charging amount is increased in comparison with a reference.

FIG. 2 is a graph showing changes over time in the gas generation amount when the volatile content of the charged coal increases, compared with a reference.

FIG. 3 is a graph showing changes over time in the amount of gas generated when the standing time is extended, compared with a reference.

FIG. 4 is a graph showing changes over time in the amount of gas generated when the dry distillation time is extended, in comparison with a reference.

FIG. 5 is a graph showing actual results and predictions of changes over time in the gas generation amount of the coke oven cluster in the example.

FIG. 6 is a graph showing a variation pattern of a gas generation amount with time in a normal carbonization chamber.

Claims (1)

[Claims] 1. A gas generation amount from a coke furnace group is calculated and predicted based on a temporal change in the gas generation amount from the charging of coal to the discharge of coke in each carbonization chamber of a coke furnace group consisting of a large number of carbonization chambers. In the method described above, the time-dependent fluctuation of the gas generation amount of each carbonization chamber is calculated and estimated from the coal charging amount, the coal volatile matter, the set time and the carbonization time, and the time-dependent change of the gas generation amount of each estimated carbonization chamber is used. A method for predicting gas generation in a coke oven, characterized by predicting gas generation in a coke oven cluster.