JP5223373B2 - Method for adjusting gas amount in coke oven combustion chamber and method for producing coke - Google Patents

Description

  The present invention relates to a gas amount adjusting method for a coke oven combustion chamber and a coke manufacturing method for adjusting the flow rate balance of fuel gas applied to the combustion chamber for each combustion chamber by the opening degree of a gas cock installed on the machine side. .

As a conventional combustion gas cock adjusting method, for example, a method as disclosed in Patent Document 1 is performed. In other words, the optimum fuel gas flow rate and air flow rate corresponding to the deviation between the target fire time and the actual fire time are supplied to each combustion chamber so that the fire time and the settling time are approximately the same time between the carbonization chambers. To calculate the fuel gas setting flow rate for each kiln by limiting the size of the deviation between the target target fire time and the actual fire time, using the standard deviation of the fire time, The fuel gas cock set flow rate is determined so that the fuel gas flow rate supplied to the furnace group in the dry distillation cycle is made constant by minimizing the variation in the flow rate between the fuel gas cocks from the flow rate. The opening is corrected.
Japanese Patent Laid-Open No. 11-35946

  However, in the conventional combustion gas cock adjustment method disclosed in Patent Document 1, the relationship between the gas cock opening and the gas flow rate is fixed, and is directly affected by the flow rate change due to dirt adhesion in the gas piping, etc. It was difficult to maintain the adjustment to reduce the variation in the burning time between the carbonization chambers over a long period of time.

  The present invention has been made in view of such a problem, and does not depend on secular change such as the pipe resistance of the gas pipe, and derives the optimum opening value at the next gas cock opening adjustment, the coke oven combustion chamber It is an object of the present invention to provide a method for adjusting the amount of gas and a method for producing coke, which includes the step of adjusting the amount of gas in the combustion chamber by this method.

  The invention according to claim 1 of the present invention is a gas amount adjusting method for a coke oven combustion chamber in which the flow rate balance of the fuel gas given to the combustion chamber for each combustion chamber is adjusted by the opening degree of the gas cock installed on the machine side. The amount of gas in the coke oven combustion chamber is calculated based on the past opening adjustment results for each combustion chamber and the combustion temperature average for each combustion chamber after opening adjustment. It is an adjustment method.

  The invention according to claim 2 of the present invention is the gas amount adjustment method for a coke oven combustion chamber according to claim 1, wherein the opening degree adjustment result is changed to a combustion chamber temperature change amount of each combustion chamber before and after the opening degree adjustment. In the coke oven, the opening coefficient adjustment value of each gas cock is calculated so that the variation in the combustion temperature between the combustion chambers after the next adjustment is within a predetermined range from the sequential identification result. It is a combustion gas cock adjustment method.

  The invention according to claim 3 of the present invention further includes a step of adjusting the amount of gas in the combustion chamber using the method of adjusting a combustion gas cock in the coke oven according to claim 1 or 2. It is.

  As a result of taking measures to solve the above problems, the present invention can easily cope with individual secular changes such as the pipe resistance of each combustion gas pipe, while each gas cock opening and the combustion chamber temperature of each combustion chamber. It became possible to identify the relationship. Further, from the obtained relational expression, the optimum value of each combustion gas cock opening that makes the variation of the combustion temperature between the combustion chambers within a predetermined range can be derived by calculation. Variations can be suppressed, and when producing coke in a coke oven, there is also an effect that the heat of dry distillation as an average value can be greatly reduced.

Embodiment 1. FIG.
FIG. 2 is a diagram showing the relationship between the combustion chamber, the carbonization chamber, and the gas cock of the coke oven. This is a simplified representation limited to the components related to the present invention. In the coke oven, coking coal is loaded from the ceiling of _N carbonization chambers (D ₁ , D ₂ ,..., D _i ,..., D _{N in} FIG. 2), and N + 1 pieces located on both sides of the carbonization chamber. Coke is produced by dry distillation with the heat of the combustion chamber (F ₁ , F ₂ ,..., F _i ,..., F _{N + 1 in} FIG. 2).

  The carbonization time is divided into a fire-off time until all the volatile components are volatilized after the generated gas temperature reaches the maximum temperature, and a subsequent setting time. The setting time is a time required to stably extrude the produced coke and usually requires several hours. In operation, it is important to control the burning time, which occupies most of the carbonization time, according to the target. The adjustment of the coke burning time is about 50 (N + 1, N) as described above by monitoring the state of the coking chamber and the combustion chamber using a process computer for managing the operation of the coke oven.・ Automatic control is performed for each carbonization chamber (furnace group).

  That is, using the process computer, the average combustion temperature of the entire furnace group is managed, and the amount of gas supplied to the entire furnace group is controlled so that this becomes the target combustion temperature. However, in order to stably maintain the coke oven operation and reduce the heat of dry distillation, it is necessary not only to manage the furnace group average, but also to reduce the variation in the combustion temperature of each combustion chamber as much as possible.

  This is because, in order to operate without making undistilled coke, the combustion time of the other carbonization chamber is adjusted to that of the carbonization chamber with the lowest combustion temperature and consequently the slowest fire time. Because it must be. As a result, an extra amount of heat is expended in the carbonization chamber with a quick fire-off time, and eventually an increase in dry distillation heat amount, that is, energy loss is caused.

Therefore, in order to prevent this, each combustion chamber is provided with a gas cock (C ₁ , C ₂ ,..., C _i ,..., C _{N + 1 in} FIG. 2) for adjusting the flow rate of the combustion gas. The temperature of the combustion chamber is adjusted to indirectly adjust the carbonization time difference between the carbonization chambers, that is, the variation between the carbonization chambers.

  However, since the conventional cock adjustment is performed on the trial and error level of the operator or is adjusted by the method disclosed in Patent Document 1 described above, the above-described problem remains.

  In the present invention, in order to solve this problem, the opening change amount at the time of adjusting the opening of each gas cock and the subsequent combustion chamber temperature change are managed for each combustion chamber, and the change from the opening change amount to the combustion chamber temperature change is managed. The influence coefficient is sequentially identified, and the combustion temperature average deviation of each combustion chamber after the next adjustment is suppressed (for example, the deviation is zero) from the relationship between the obtained gas cock opening and the combustion temperature average deviation of each combustion chamber. In other words, the recommended adjustment value of each gas cock opening is calculated so as to minimize the variation in the combustion temperature between the combustion chambers after the next adjustment within a predetermined range.

  Hereinafter, the flow of processing of the present invention will be described with reference to the drawings. FIG. 1 shows an example of the processing flow.

  First, past results such as actual value data of the combustion chamber temperature are stored in a storage device (for example, the operation result data storage device shown in FIG. 2) (step S1).

  And the actual value data of the combustion chamber temperature memorize | stored in the memory | storage device is read, about each combustion chamber, ie, the i-th (i; combustion chamber number, i = 1-N + 1) combustion chamber, the last gas cock The amount of change in the average value of the combustion chamber temperature before and after adjusting the opening is calculated (step S2).

Specifically, for each combustion chamber, the combustion temperature before adjusting the gas cock opening, the combustion temperature average FT [before adjustment] _i that is averaged over time, and the combustion temperature after adjusting the gas cock opening The combustion temperature average after adjustment FT [after adjustment] _i is averaged over time.

Then, the gas cock opening the combustion temperature average FT [adjusted] after adjustment _i, gas cock opening adjustment before combustion temperature average FT [unadjusted] change amount with respect to _{i ΔFT i} (= FT [Adjusted] _i -FT [ _I ) before adjustment.

Next, the actual change amount Δf _i of the gas cock opening of each combustion chamber adjusted in the past from the storage device, the operation management computer, etc. (= the adjusted opening of the i-th combustion chamber−i-th combustion chamber) (I: combustion chamber number, i = 1 to N + 1) is input (step S3).

Then, the influence coefficient (a, b) is sequentially identified from the above-described ΔFT _i and Δf _{i according} to the relationship expressed by the following equation (1) (step S4).

As shown in FIG. 2, when the i-th (i = 1 to N + 1) gas cock C _i is changed to the opening direction, the gas flowing into the i-th combustion chamber increases, so the combustion chamber temperature Rises. The influence coefficient is a in the equation (1).

Meanwhile, since the gas flow rate of the entire Rodin constant, by gas flowing into the i-th combustion chamber F _i is increased, the gas flow to the other combustion chamber is reduced. As a result, the combustion temperature in the combustion chambers other than the i-th shifts in a direction slightly lowering. In equation (1), the coefficient is b.

  Now, since the equation (1) has two unknown parameters (a, b) and the number of equations is N + 1, the ordinary least squares method is applied to determine (a, b). Mathematically, a solution can be obtained by multiplying the generalized inverse matrix of the coefficient matrix of equation (2) from the left by re-wrapping equation (1) with respect to a and b.

  Next, based on the influence coefficients a and b obtained in step S4, the adjustment amount (change amount) of the gas cock opening for suppressing the variation in the combustion temperature between the carbonization chambers at the next adjustment of the gas cock opening. Is calculated (step S5).

Here, the combustion chamber temperature average FT [after adjustment] _i (i = 1 to N + 1) obtained by the previous gas cock adjustment is used as the combustion chambers (i = 1 to N) of all the furnace groups. +1) Combustion chamber temperature furnace group average FT ′ (= (FT [after adjustment] ₁ + FT [after adjustment] ₂ + ... + FT [after adjustment] _{N + 1} ) / (N + 1)) The adjustment amount of the next gas cock opening for matching is calculated.

Specifically, the deviation ΔFT ′ _i (= FT _i −FT ′) of the combustion temperature average FT [after adjustment] _i (i = 1 to N + 1) of each combustion chamber with respect to the combustion chamber temperature furnace group average FT ′. , Deviation 0 means the mean value of the furnace group), where [ΔFT ' ₁ ΔFT' ₂ ΔFT ' ₃ ... ΔFT' _i ... ΔFT ' _{N + 1} ], the combustion in each combustion chamber according to the result of the next gas cock adjustment The gas cock so that the temperature average variation ΔFT _i (i = 1 to N + 1) becomes [−ΔFT ′ ₁ −ΔFT ′ ₂ −ΔFT ′ ₃ ... −ΔFT ′ _i ... −ΔFT ′ _{N + 1} ], respectively. Adjust. As a result, the deviation of the combustion chamber temperature average FT [after adjustment] _i (i = 1 to N + 1) for each combustion chamber from the combustion chamber temperature furnace group average FT ′ is predicted to be zero.

Therefore, the influence coefficient (a, b) obtained by the above equation (2) is substituted into the following equation (3) to obtain the next optimum opening change amount Δg _i (i = 1 to N). By solving, the optimum adjustment opening degree (change amount) for eliminating the variation in the combustion temperature of each combustion chamber in the next operation is obtained. Although the deviation is set to 0 here, it may be set to a value other than 0 or within a predetermined range. In that case, a predetermined value may be added to −ΔFT ′ _i as a bias.

The above equation (3) is a simultaneous equation with N + 1 unknowns and N + 1 equations, and the solution is uniquely determined. That is, the solution [Δg ₁ Δg ₂ Δg ₃ ... Δg _i ... Δg _{N + 1} ] of the equation (3) is the optimum adjustment value at the next adjustment.

Embodiment 2. FIG.
The characteristics of the carbonization chamber / combustion chamber at the end may be considered separately from other kilns. In this case, the influence coefficient equation corresponding to the equation (1) is as the following equation (4). Here, the influence coefficients from Δf ₁ and Δf _{N + 1} are used as different signs, and the influence of the end kiln is handled separately.

    In this case, the above-described equation (2) becomes the following equation (5).

  In the case of the equation (5), the number of equations is N + 1, the number of unknowns is 4, and if N + 1 is 4 or more, there is a possibility that an influence coefficient is obtained. The condition may be mathematically as long as the rank (rank) of the left-side matrix is greater than or equal to the unknown. Similarly, as long as the condition of rank is satisfied, the number of unknowns, that is, the number of different influence coefficients can be increased, so that it is possible to handle the influence coefficient in consideration of the mutual positional relationship between the combustion chamber and the carbonization chamber. Embodiment 1 Similarly, in the equation (2), it is possible to increase the number of different influence coefficients if the condition that the rank (rank) of the left-side matrix is equal to or greater than the unknown number is satisfied.

  In the present invention, in particular, the first embodiment. And Embodiment 2. However, the present invention is not limited to the specific forms such as the formulas (1) and (4) described in the above. As long as the basic idea is the same and the rank condition of the matrix is satisfied, any model equation structure can be assumed.

It is a figure which shows an example of the processing flow of this invention. It is a figure which shows the relationship between the combustion chamber of a coke oven, a carbonization chamber, and a gas cock.

Explanation of symbols

C _{1 to} C _{N + 1} gas cock F _{1 to} F _{N + 1} combustion chamber D _{1 to DN} carbonization chamber

Claims (3)

A method for adjusting the amount of gas in a coke oven combustion chamber in which the flow rate balance of the fuel gas to be given to the combustion chamber is adjusted by the opening of a gas cock installed on the machine side,
Based on the combustion temperature average of past opening adjustment results for each combustion chamber and the combustion chamber each before and after the opening adjustment,
The influence coefficient on the amount of change in the combustion chamber temperature average of each combustion chamber before and after the opening adjustment from the opening adjustment results ,
The influence coefficient a on the change amount of the combustion chamber temperature average of the i-th combustion chamber with respect to the i-th (i = 1 to N + 1, N + 1 is the number of combustion chambers) gas cock opening change amount, and other than the i-th The coefficient of influence b on the amount of change in the combustion chamber temperature average of the combustion chamber is sequentially identified as a different variable by the least square method ,
From the sequential identification result, the next gas cock opening to match the combustion chamber temperature average for each combustion chamber obtained in the previous gas cock adjustment with the combustion chamber temperature furnace average obtained by averaging all the combustion chambers in the combustion chamber. A method for adjusting a combustion gas cock in a coke oven, wherein an adjustment amount of the degree is calculated. In the coke oven combustion chamber gas amount adjusting method according to claim 1,
A method for adjusting a combustion gas cock in a coke oven, characterized in that an influence coefficient for an amount of change in an average combustion chamber temperature of an end combustion chamber is set to a value different from the influence coefficients a and b . A method for producing coke, comprising the step of adjusting the amount of gas in the combustion chamber using the method for adjusting a combustion gas cock in a coke oven according to claim 1 or 2.

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