JP2001049258A - Furnace temperature control method for coke oven - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To propose a coke oven temperature control method for a coke oven, which is capable of operating accurately and promptly in response to information such as setting of an operation plan in a coke oven and change of the plan. SOLUTION: A first step of calculating a furnace group reference temperature obtained by adding a temperature change value corresponding to the property of charged coking coal to a furnace group standard temperature calculated from a degree of operation of a coke oven;
A second step of drawing a time-temperature curve (U-shaped temperature curve) corresponding to each carbonization chamber in the operation plan and the operation conditions based on the operation management data including the operation results and the operation plan; A third step of synthesizing a U-shaped temperature curve of each carbonization chamber adjacent to the combustion chamber and drawing a time-temperature curve (W-shaped temperature curve) of the combustion chamber for the combustion chamber; A fourth step of plotting the average W-shaped temperature curve to calculate the furnace group temperature, and calculating the furnace group reference temperature by adding the furnace group temperature to the furnace group reference temperature calculated in the first step. And a sixth step of controlling the furnace temperature and the combustion time for each furnace group unit based on the furnace group reference temperature calculated in the first step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coke oven temperature control method for a coke oven in which a plurality of combustion chambers and carbonization chambers are alternately arranged to constitute one unit of an oven group. The present invention relates to a coke oven temperature control method for controlling the combustion temperature of each unit to an appropriate temperature corresponding to a change in an operation plan and operation conditions.

[0002]

2. Description of the Related Art As is well known, a coke oven is constituted by alternately arranging a plurality of (normally several tens of chambers) combustion chambers and a carbonization chamber. On the other hand, a fuel gas for carbonizing the raw coal charged into the furnace is supplied by passing through a distribution branch pipe branched from the fuel gas main pipe.

[0003] Furnace temperature control for each furnace group is performed by alternately repeating a combustion period and a rest period for each furnace group unit. In this case, product coke of stable quality is obtained. It is important to always control the temperature of each coke oven unit in the coke oven to an appropriate value in order to obtain continuously and further to save fuel gas consumption.

[0004] On the other hand, up to the present, a control criterion for controlling the temperature of a coke oven is based on the heat energy required for dry distillation of the coking coal, and is based on the heat energy of the coking coal. The main focus has been to make corrections corresponding to the properties of fuel and volatile components, and to consider only the heat loss of the coke oven itself.

[0005]

However, the reference value for the conventional temperature control of a coke oven described above is a so-called kiln discharge, which is one of the important factors in operation.
No consideration has been given to the information on the operation plan of kiln loading.In this case, for example, regarding the response to the suspension of operation due to work machine failure or furnace construction, etc.
At present, it is only entrusted to manual operations by workers.

[0006] For this reason, even in the case of an unsteady shutdown state in the coke oven as described above, it can be said that measures can be taken because the response itself is relatively clear. For example, regarding the heating management response to daily events such as a delay of operation for several minutes or several tens of minutes in each furnace group, it is relatively stagnant or overlooked. Along with this, there have been problems such as inadequate control over carbonization of coking coal and quality control of carbonized product coke, and an unnecessary increase in the amount of heat required for carbonization.

Therefore, recently, as an improvement measure for controlling the combustion temperature (furnace temperature) in a coke oven, (1)
First, regarding the improvement of combustion conditions, (a) a technology for monitoring the combustion state of a coke oven and adjusting the combustion control amount based on each concentration of oxygen or carbon monoxide in the flue from which the combustion gas is discharged (Japanese Patent Laid-Open No. 7-126627 and JP-A-5-239461. (b) Technology for controlling the furnace temperature distribution and reducing sensible heat loss in exhaust gas by manipulating the amount of combustion gas, pressure, air mixing ratio, etc. (JP-A-7-166165, JP-A-58-19)
6288, JP-A-58-89684, JP-A-56-34785 and JP-A-58-5561.
3 gazettes). (c) A technique in which the calorific value of the combustion gas is taken into the input term and the process operation amount is adjusted so as to cancel the variation with time (Japanese Patent Application Laid-Open Nos. 7-19453 and 2-102291). (2) Regarding the improvement of instrumentation equipment, (d) Response delay of coke oven, which has a relatively large heat capacity and is peculiar to the control object, by devising PID and feedback circuit. Technology to correct. (e) Represented by a linear discrete-time system

(Equation 1) Technology that controls the control process to minimize the control deviation. Have also been tried.

On the other hand, as a method of controlling the temperature of a coke oven,
Since the temperature in the combustion chamber itself is affected by the heat of the coking coal charged in the adjacent carbonization chamber, the furnace temperature of the combustion chamber changes in a specific time-temperature curve, that is, a so-called W-shaped temperature curve. In view of the fact that, based on the W-shaped temperature curve of the furnace temperature,
2. Description of the Related Art A technique for controlling a supply amount of fuel gas supplied through a distribution branch pipe (JP-A-58-142973) is known.

[0009] However, this method itself is effective only as a method of adjusting the furnace temperature in each combustion chamber, but as useful data in which the operation information as the object of the present invention is sufficiently taken into consideration, each unit of each furnace group is used. The problem remains in that it is not a technology for performing temperature control on a case-by-case basis.

SUMMARY OF THE INVENTION The present invention has been made to solve each of the conventional problems described above, and has as its object to set an operation plan in a coke oven and to provide information such as a change in the plan. Another object of the present invention is to propose a new method of controlling the temperature of a coke oven in a coke oven, which enables the operation to be performed accurately and promptly and at the same time effectively reduces the required amount of fuel gas.

[0011]

According to a first aspect of the present invention, there is provided a coke oven furnace temperature control method according to the present invention, wherein a plurality of combustion chambers and a carbonization chamber are alternately arranged. A coke oven which operates by alternately repeating a combustion period and a rest period for each unit so as to constitute one unit and to adjust the temperature of each unit. The method of controlling the temperature of the furnace group according to the above, wherein a temperature change value corresponding to the properties of the coking coal to be added is added to the furnace group standard temperature calculated from the operation degree of the coke oven to obtain the furnace group reference temperature. A time-temperature curve (U-shaped temperature curve) corresponding to each carbonization chamber in the operation plan and the operation conditions is drawn based on the first process to be calculated and operation management data including the operation results and the operation plan. A second step, a U-shaped temperature of each carbonization chamber adjacent to the combustion chamber; A third step of synthesizing the curves and plotting a time-temperature curve (W-shaped temperature curve) of the combustion chamber for each combustion chamber; and plotting an average W-shaped temperature curve for each furnace group unit. A fourth step of calculating the temperature value of the furnace group by using the
A fifth step of calculating a furnace group reference temperature by adding the furnace group temperature adjustment value calculated in the fourth step; and a furnace group unit based on the furnace group reference temperature calculated in the fifth step. And a sixth step of controlling the furnace temperature and the combustion time for each furnace.

Therefore, in the method of the present invention, a plurality of combustion chambers and carbonization chambers are alternately arranged to constitute one unit of the furnace group, and the combustion period and the rest period are alternately performed for each furnace group unit. In a coke oven that operates repeatedly, the furnace temperature and combustion time are controlled based on the target temperature value of the furnace group corresponding to information such as the setting and change of the operation plan, so the fuel gas consumption in the coke oven Can be effectively saved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a coke oven temperature control method according to the present invention will be described below in detail with reference to FIGS.

FIG. 1 is an explanatory plan view schematically showing an arrangement relationship between a combustion chamber and a carbonization chamber in a coke oven to which the method of the present invention is applied.

In the configuration shown in FIG.
Is constituted by alternately arranging individual rows of the combustion chambers 11a, 11b,..., 11e and individual rows of the individual carbonization chambers 12a, 12b,.

In this case, from the necessity of the division for the furnace temperature control, one of the combustion chambers 11a, 11b,... Each of the combustion chambers 11b and 11a on the other side has a furnace number n + 1 and n + 2, respectively, and each of the combustion chambers 11d and 1 on the other side has
1e are furnace numbers n-1 and n-2, respectively. Similarly, for each of the carbonized chambers 12a, 12b,. Respective carbonization chambers 12b and 12a on one side are respectively furnace numbers N + 1 and N + 2, and carbonization chambers 12d and 1
2e are respectively furnace numbers N-1 and N-2. Therefore, the above-mentioned furnace group for each unit is constituted by each carbonization chamber and each combustion chamber on the preceding and subsequent stages.

As described above, the furnace group temperature control method according to the present embodiment sequentially includes the following first to sixth steps.

That is, first, in the first step, in order to achieve a predetermined calcination time (time until the end of dry distillation) and a predetermined laying time (so-called soaking time) of the charged coking coal, the operating rate of the coke oven is set. Is calculated by adding the temperature change value resulting from the properties of the coking coal to be charged, that is, the properties such as moisture and volatile components, to the furnace group standard temperature calculated from.

Next, in the second step, the individual carbonization chambers (12a to 12e) in the operation plan and the operation conditions are set on the basis of the operation results and the operation management data including the next coking coal charging schedule. A corresponding time-temperature curve (U-shaped temperature curve) is drawn and calculated. In this case, the calculated U-shaped temperature curves are sequentially calculated and updated at a fixed cycle (for example, a calculation cycle of the process computer for each combustion switching). That is, the latest temperature control information is taken into account for each corresponding cycle.

In the third step, each U-shaped temperature curve for each of the carbonization chambers (12a to 12e) calculated in the second step is applied to each combustion chamber (11a).
To 11e), a pair of carbonization chambers adjacent to each other on the front side and the rear side (for example, in the case of the combustion chamber 11a of the furnace number n + 2, the carbonization chamber 12a of the furnace number n + 2 adjacent on the left and right thereof and the carbonization chamber 12a of the furnace number n + 1) Each of the combustion chambers (for example, the combustion chamber 11b) is synthesized in the carbonization chamber 12b.
The time-temperature curves (W-shaped temperature curves) in a) are converted into individual combustion chambers (combustion chambers 11b to 11 including the combustion chamber 11a).
e) Draw and calculate each time.

Further, in the fourth step, a W-shaped temperature curve averaged for each furnace group unit, which is one unit reference for furnace temperature management, is drawn and calculated, and the furnace group at the corresponding time is calculated. Temperature adjustment value (correction value, value to what extent it is necessary to adjust and change the combustion temperature of each furnace group)
Is calculated.

Subsequently, in the fifth step, by adding the correction value of the furnace group temperature calculated in the fourth step to the reference temperature of the furnace group calculated in the first step, the furnace group reference temperature as the control target value is adjusted. calculate.

Thereafter, in the sixth step, the combustion time in the combustion period of each unit is adjusted based on the reference temperature of the furnace calculated in the fifth step. The combustion temperature for each unit is controlled individually.

On the other hand, in this case, the combustion time is adjusted by controlling the supply time and the supply amount of the fuel gas supplied to the combustion chamber. In other words, by adjusting the amount of heat required for the dry distillation of coking coal, and thus the consumption of fuel gas, the fuel gas can be saved as effectively and effectively as possible. Can be helpful.

Subsequently, the calculation of the U-shaped temperature curve in each of the second and third steps, the relationship between the U-shaped temperature curve and the W-shaped temperature curve, and the fourth and fifth steps. Each of the calculation of the furnace group target temperature value will be specifically described.

FIG. 2 is an explanatory view showing an example of a calculation standard of a time-temperature curve of the carbonization chamber, here, a U-shaped temperature curve. FIG. 3 is a view showing the second and third curves. It is a conceptual block diagram for giving an example of the relationship between processes for reference.

(A) Calculation of U-shaped temperature curves Here, in order to calculate the relative temperatures of the W-shaped temperature curves of the combustion chambers 11a to 11d, first, the carbonized chambers 12a to 12d are calculated.
After calculating the relative temperature of the U-shaped temperature curve resulting from the kiln opening / closing in 12e, the corresponding carbonization chambers 12a-1
2e is linked. Then, for example, the combustion chamber 1
U at the carbonization chambers 12c and 12d on both sides adjacent to 1c
The W-shaped temperature curve in the combustion chamber 11c is obtained by adding the relative temperatures of the V-shaped temperature curve.

The calculation conditions of the W-shaped temperature curve and the respective definitions accompanying the calculation at this time are as follows.

(A) Calculation processing of actual measured value of combustion chamber temperature Flue temperature measured by a plurality of thermocouples arranged on the ceiling wall of the combustion chamber is collected at the timing of the starting point of the combustion switching signal. At this time, the temperature measurement can be classified into a waste gas period and a combustion period, and the obtained measured temperature shows a value that rises and falls in a so-called sawtooth shape with the combustion switching. By plotting only the values and representing the temperature change in the long-term range, this temperature curve draws a W shape, that is, a W-shaped temperature curve.

(B) Calculation of average temperature of furnace group The actual measured values of the combustion temperature in each combustion chamber were averaged except for those excluded under specific conditions, and the average was calculated as the average temperature of the furnace group (PV). Used for temperature control.

(C) Calculation process of estimated charging time In addition to the estimated charging time created by the operation management function, the estimated charging time is calculated for each carbonization room, taking into account the delay in kiln loading and unloading. Then, the relative temperature of the U-shaped temperature curve is calculated based on the estimated charging time to obtain heating control data.

(D) Calculation process of relative temperature of W-shaped temperature curve The relative temperature of the W-shaped temperature curve in each combustion chamber is calculated based on the relative temperature of the U-shaped temperature curve determined by putting the kiln into and out of each kiln. The temperature is obtained by synthesizing the temperature with the temperature of the adjacent carbonization chamber. This is averaged for all combustion chambers, and is reflected in the furnace group reference temperature as a correction value for the W-shaped temperature curve. Further, the reference temperature of the W-shaped temperature curve is calculated by adding the furnace group reference temperature, the relative temperature of the W-shaped temperature curve for each combustion chamber and each furnace group, and the combustion bias temperature.

Definition of time direction

(Equation 2)

Definition of temperature direction

(Equation 3)

Parameter setting In the above equations (1), (3) to (5), a ₁ , a ₂ ,
a ₃ , b, x, y, and z are set in the parameter list,
These are assumed to be variable.

Calculation of the relative temperature of the U-shaped temperature curve The relative temperature of the U-shaped temperature curve in the combustion chamber affected by the temperature of the carbonization chamber is calculated.

(Equation 4)

[0037] · U-shaped temperature curve of W-shaped temperature curve of the relative temperatures at ♯n combustion chamber of calculation t _x time of W-shaped temperature curve of relative temperature by superposition of the relative temperature, each of the U The relative temperatures of the shape temperature curves are added and synthesized.

(Equation 5)

Furnace average value processing of relative temperature of W-shaped temperature curve Relative temperature value of W-shaped temperature curve in each combustion chamber at the time of startup, in this case, each W-shaped relative temperature value _{θnW relative} After the temperature is obtained, the average temperature value is obtained to obtain θ.
_{Furnace team W-shaped correction value} . In the case where the W-shaped relative temperature is missing, this is excluded from the averaging target.

[0039] When the check theta _{Rodin W-correction value} of the data limit value exceeds the upper limit theta _H, This is referred to as theta _H. Similarly, in the case of less than the lower limit theta _L, this is referred to as theta _L. These are set by a parameter list.

(E) Processing for calculating the correction value of the temperature of the furnace group W-shape The correction value of the temperature curve of the furnace group W-shape of the furnace group reference temperature is calculated for each furnace group.

(F) Process for calculating the reference temperature of the furnace group The reference temperature of the furnace group is set with reference to the standard temperature according to the operation rate. In this case, the furnace group reference temperature is equal to the reference firing time (S
V) and the average firing time (PV) are sequentially corrected. For this reason, as a result, the furnace group reference temperature is composed of the reference temperature and the correction value uniquely determined by the operation degree.

(G) Calculation process of a furnace-group W-shaped temperature correction value A furnace-group W-shaped temperature curve correction value of the furnace-group reference temperature is calculated for each furnace group.

(H) Calculation of Charging Coal Properties Correction Value Properties of charging coking coal at the furnace base temperature (moisture, VM, etc.)
Is calculated.

(I) Calculation process of furnace group reference temperature The furnace group reference temperature is set as a target value of the furnace group control used for the interval value, the W-shaped temperature curve, and the like.

That is, the furnace group reference temperature is calculated based on the furnace group standard temperature, the correction value based on the properties of the charged coal, the correction value of the furnace group W-shaped temperature curve, and the like.

As described above, the required temperature control values can be easily calculated, whereby the desired operation and effect can be obtained.

Here, a specific example in which the furnace temperature control method according to the present embodiment is applied will be described in comparison with the case of the conventional method.・ In the case of a two-hour operation stoppage at 126% operation (construction or other trouble)

[Table 1]

[0048]

As described above in detail in the embodiment, according to the method for controlling the temperature of the coke oven of the coke oven according to the present invention, a plurality of combustion chambers and carbonization chambers are alternately arranged to form one unit. In coke ovens that constitute a furnace group and operate alternately with a combustion period and a rest period for each furnace group, the furnace group reference temperature value that responds accurately and promptly to changes in operation plans and operating conditions As a result, the furnace temperature and the combustion time are controlled based on the results, so that the quality control of the product coke becomes easier and the amount of heat required for dry distillation of coking coal is reduced accordingly. It has excellent features such as being able to help save energy.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view schematically showing the relationship between the arrangement of a combustion chamber and a carbonization chamber in a coke oven to which the method of the present invention is applied.

FIG. 2 is a time-temperature curve of a carbonization chamber in the method of the present invention;
Here, it is explanatory drawing which shows an example of the calculation standard of a U-shaped temperature curve.

FIG. 3 is a conceptual block diagram for referencing an example of a relationship between second and third steps in the method of the present invention.

[Explanation of symbols]

 A coke oven 11a to 11e combustion chamber 12a to 12e carbonization chamber n, N furnace number

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Shoji Hara No. 1 Banno-cho, Sakaide-shi, Kagawa F-term in Mitsubishi Chemical Corporation Sakaide Works (reference) 4H012 AA02 AA05 AA06 AA08 AA09 EA00 LA05

Claims (1)

[Claims] 1. A plurality of combustion chambers and carbonization chambers are alternately arranged to constitute one unit of a furnace group, and each of the furnace groups is arranged so that the temperature of the furnace group can be adjusted for each of the furnace groups. A method for controlling the temperature of a coke oven of a coke oven that operates by alternately repeating a combustion period and a rest period for each unit, wherein a raw material to be charged with respect to a standard temperature of the oven calculated from a degree of operation of the coke oven. Based on the first step of calculating the furnace group reference temperature by adding the temperature change values corresponding to the properties of the charcoal, and the operation management data consisting of the operation results and the operation plan, each individual operation plan and operation conditions A second step of plotting a time-temperature curve (U-shaped temperature curve) corresponding to the coking chamber; and combining a U-shaped temperature curve of each coking chamber adjacent to the combustion chamber to obtain a time- Third plotting of temperature curves (W-shaped temperature curves) for individual combustion chambers A fourth step of plotting an average W-shaped temperature curve for each furnace group unit to calculate a furnace group temperature adjustment value; and a furnace group reference temperature calculated in the first step,
A fifth step of calculating a furnace group reference temperature by adding the furnace group temperature adjustment value calculated in the fourth step; and a furnace group unit based on the furnace group reference temperature calculated in the fifth step. A sixth step of controlling each furnace temperature and combustion time for each coke oven temperature control method.