JP2024016577A - Deposit carbon removal method in coke oven carbonization chamber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deposit carbon removal method in a coke oven carbonization chamber which can realize both push clogging generation inhibition and black smoke generation inhibition.

SOLUTION: There is provided a method for inserting a lance into a carbonization chamber for blowing an oxygen-containing gas thereinto to thereby perform oxidation removal of deposit carbon. The method includes: when coal carbonization operation after execution of deposit carbon removal operation in the carbonization chamber is performed, measuring a CO concentration of exhaust combustion gas which passes through a combustion chamber adjacent to the carbonization chamber with the deposit carbon being removed therefrom; comparing a preset upper limit or lower limit management criterion value of the CO concentration of the exhaust combustion gas in the combustion chamber to an actual measured value of the CO concentration of the exhaust combustion gas; and, when deposit carbon removal operation after the coal carbonization operation is performed, 1) if the actual measured value exceeds the CO concentration upper limit management criterion value, shortening a blowing-into time of the oxygen-containing gas and/or decreasing a blowing-into amount per unit time and 2) if the actual measured value is less than the CO concentration lower limit management criterion value, extending the blowing-into time of the oxygen-containing gas and/or increasing the blowing-into amount per unit time.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a method for oxidizing and removing carbon deposited in a coke oven carbonization chamber.

In the carbonization chamber of a coke oven, carbon produced by thermal decomposition of carbonized gas and pulverized coal scattered during coal charging adhere to the oven wall and turn into coke, resulting in deposited carbon.
As this carbon adhering to the furnace wall grows, it lowers the thermal conductivity of the furnace wall and reduces the effective volume of the carbonization chamber, reducing furnace productivity and making it impossible to extrude coke. This causes so-called clogging, which requires periodic removal work.
In order to solve this problem, various methods have been proposed in the past in which an injection nozzle (lance) is inserted into a carbonization chamber and carbon is burned and removed while injecting a gas containing oxygen, such as air.

For example, Patent Document 1 discloses that by measuring the CO 2 concentration when exhaust gas generated by supplying oxygen-containing gas into the carbonization chamber and oxidizing the deposited carbon from the carbonization chamber, the CO ₂ concentration can be measured based on the concentration change. It states that the combustion completion time can be determined. This is based on the finding of a strong correlation between the amount of attached carbon and the concentration of _CO2 in exhaust gas.
Patent Document 1 also describes that in addition to measuring the CO ₂ concentration in the exhaust gas mentioned above, measuring the temperature of the exhaust gas exhausted from the carbonization chamber can help determine the completion of combustion of attached carbon. ing.
Patent Document 2 discloses that a gas containing oxygen (oxygen-containing gas) is supplied to a carbonization chamber, and when exhaust gas generated by oxidation of attached carbon is exhausted from the carbonization chamber, the O ₂ concentration is measured, and the concentration change is measured. It is stated that the smoothness of the furnace wall of the carbonization chamber can be estimated from This is based on the finding of a strong correlation between the O ₂ concentration in the exhaust gas and the smoothness of carbon attached to the furnace wall.

Japanese Patent Application Publication No. 2006-124559 Japanese Patent Application Publication No. 2008-201925

The inventors of the present application discovered the following regarding deposited carbon when operating a coke oven.
Adhesive carbon was found on both the main body and joints of the carbonization chamber bricks. In addition, depending on the blend type of coal to be carbonized and the temperature changes in the combustion chamber and carbonization chamber during operation, adhering carbon may be removed during coal carbonization operation (hereinafter also simply referred to as carbonization operation) or adhering carbon may be removed. Any of the cases where the deposition progressed was possible.

Therefore, even if the adhering carbon is properly removed when the carbonization operation is stopped using the technology described in Patent Document 1, the carbon adhering to the brick joints will be removed during the carbonization operation, and the coke oven gas will pass through the brick joints. (hereinafter also referred to as COG) is supplied from the carbonization chamber to the combustion chamber, and there is a risk that combustion failure will occur in the combustion chamber and the combustion exhaust gas will exhibit black smoke.
In addition, due to long-term use of the bricks that separate the carbonization chamber and the combustion chamber (furnace wall bricks), the thermal sprayed material in the joints may peel off and fall off, and these areas may be blocked by adhering carbon. There may be cases where In this case, in order to prevent COG generated in the carbonization chamber from being supplied to the combustion chamber and causing poor combustion in the combustion chamber, the carbon that has blocked the joints is effective in preventing poor combustion in the combustion chamber.
As described above, the technique described in Patent Document 1 has a problem in that it may be difficult to simultaneously suppress the occurrence of clogging and suppress the generation of black smoke.

In addition, even with the technology described in Patent Document 2, as in Patent Document 1 mentioned above, even if the adhering carbon is properly removed when the carbonization operation is stopped, the carbon adhering to the brick joints will not be removed during the carbonization operation. , COG is supplied from the carbonization chamber to the combustion chamber through the brick joints, which may cause combustion failure in the combustion chamber and cause the combustion exhaust gas to exhibit black smoke.
From the above, the technique described in Patent Document 2 has a problem in that it may be difficult to simultaneously suppress the occurrence of clogging and suppress the generation of black smoke.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for removing adhering carbon from a coke oven carbonization chamber, which can both suppress the occurrence of clogging and suppress the generation of black smoke.

The present inventors have discovered that when operating a coke oven, in order to suppress both clogging and black smoke generation, it is important to remove adhering carbon from the furnace wall of the carbonization chamber while leaving an appropriate amount. I came up with this idea.
The gist of the invention is as follows.

A method for removing carbon deposited in a coke oven carbonization chamber according to the first invention that meets the above object includes inserting a lance into the carbonization chamber, blowing oxygen-containing gas, and oxidizing deposited carbon in the carbonization chamber with the heat retained in the carbonization chamber. In a method for removing carbon deposited in a coke oven carbonization chamber,
During a coal carbonization operation after carrying out an operation for removing adhering carbon in the carbonization chamber, measuring the CO concentration of the combustion exhaust gas passing through a combustion chamber adjacent to the carbonization chamber from which adhering carbon has been removed,
Comparing a preset control standard value of the CO concentration of the combustion exhaust gas in the combustion chamber with the measured value of the CO concentration of the combustion exhaust gas,
On the condition that the actual measured value exceeds the control standard value, the blowing time of the oxygen-containing gas during the carbon removal operation in the carbonization chamber performed after the coal carbonization operation is shortened, and/or the oxygen-containing gas is Reduce the amount of blowing per unit time.

The CO concentration of combustion exhaust gas usually has an upper limit value that is an environmental standard value, and in a coke oven, a value lower than the environmental standard value is set as the upper limit value (i.e., the control standard value of the first invention). , which is used as a guideline for management. In other words, when the CO concentration of the combustion exhaust gas exceeds the management standard value, it can be assumed that COG is leaking from the carbonization chamber to the combustion chamber through the joint.
Note that the management standard value itself varies depending on the combustion adjustment status that differs depending on the coking chamber (for example, 10 ppm for combustion chamber P, 15 ppm for combustion chamber Q, etc.), so it is based on the operating results for a certain period ( It is advisable to decide this in advance according to the measurement results). Specifically, it is conceivable to use the upper limit of the numerical range of CO concentration that is considered normal as the control reference value.

A method for removing carbon deposited in a coke oven carbonization chamber according to a second aspect of the invention that meets the above-mentioned object includes inserting a lance into the carbonization chamber, blowing oxygen-containing gas into the carbonization chamber, and oxidizing the deposited carbon in the carbonization chamber with the heat retained in the carbonization chamber. In a method for removing carbon deposited in a coke oven carbonization chamber,
During a coal carbonization operation after carrying out an operation for removing adhering carbon in the carbonization chamber, measuring the CO concentration of the combustion exhaust gas passing through a combustion chamber adjacent to the carbonization chamber from which adhering carbon has been removed,
Comparing a preset control standard value of the CO concentration of the combustion exhaust gas in the combustion chamber with the measured value of the CO concentration of the combustion exhaust gas,
On the condition that the actual measured value is less than the control standard value, extending the blowing time of the oxygen-containing gas during the carbon removal operation in the carbonization chamber performed after the coal carbonization operation, and/or extending the blowing time of the oxygen-containing gas Increase the amount of blowing per unit time.

When the CO concentration of the combustion exhaust gas is less than the control standard value of the second invention, it can be considered that deposited carbon is excessively deposited on the furnace wall.
For this reason, the management reference value is preferably determined in advance according to the operational performance (measurement performance) over a certain period of time. Specifically, it is conceivable to use the lower limit of the numerical range of CO concentration that is considered normal as the control reference value.

Here, the same term "control standard value" is used in the first and second inventions, but usually the numerical value of the control standard value (substantially the upper limit value of CO concentration) described in the first invention is However, the value is higher (different value) than the control reference value (substantially the lower limit value of CO concentration) described in the second invention.

The method for removing carbon deposits in a coke oven carbonization chamber according to the present invention provides a method for removing carbon deposits in a coke oven carbonization chamber, during a coal carbonization operation after performing an operation for removing carbon deposits in a coke oven, the CO concentration of combustion exhaust gas passing through a combustion chamber adjacent to the carbonization chamber. The CO concentration of the combustion exhaust gas in the combustion chamber is measured and compared with the control standard value of the CO concentration of the combustion exhaust gas in the combustion chamber set in advance, and the actual value of the CO concentration of the combustion exhaust gas is compared. Determine the degree of
Specifically, if the actual measured value exceeds the control standard value, it means that too much adhered carbon has been removed (the amount of COG flowing from the carbonization chamber to the combustion chamber is excessive), so the adhering carbon removal operation should be carried out after the coal carbonization operation. The degree of carbon removal is alleviated by shortening the time for blowing oxygen-containing gas and/or reducing the blowing amount per unit time.
In addition, if the actual measured value is less than the control standard value, the removal of adhering carbon is insufficient (coke clogging is likely to occur). The degree of carbon removal is enhanced by extending the blowing time and/or increasing the blowing amount per unit time.
As a result, it is possible to remove adhering carbon from the furnace wall of the carbonization chamber while leaving behind an appropriate amount (an amount that blocks the brick joints in the carbonization chamber), thereby achieving both suppression of clogging and suppression of black smoke generation.

(A) is an explanatory diagram showing the order of treatment steps in a method for removing carbon deposited in a coke oven carbonization chamber according to an embodiment of the present invention, and (B) to (D) are schematic diagrams of the coal charging process and coke They are a schematic diagram of an extrusion process and a schematic diagram of a carbon removal process. (A) to (C) are a cross-sectional view of the carbonization chamber, a vertical cross-sectional view taken along the coke extrusion direction, and a vertical cross-section taken in a direction perpendicular to the coke extrusion direction, respectively, showing the influence of carbon on coke extrudability. It is a diagram. (A) to (C) are explanatory diagrams showing the behavior of CO concentration of combustion exhaust gas in a combustion chamber.

Next, embodiments embodying the present invention will be described with reference to the attached drawings to provide an understanding of the present invention.
As shown in FIGS. 1(A) to (D) and FIGS. 2(A) to (C), the method for removing adhering carbon in a coke oven carbonization chamber according to an embodiment of the present invention involves incinerating carbon in a carbonization chamber 10. This is a method in which a lance 11 is inserted and oxygen-containing gas is blown into the carbonization chamber 10 to oxidize and remove the adhering carbon in the carbonization chamber 10 using the heat retained in the carbonization chamber 10. This method achieves both prevention of clogging and black smoke generation. It's a method.
This will be explained in detail below.

First, the coke manufacturing process will be explained with reference to FIG.
As shown in the order of processing steps in FIG. ), coke is produced by heating and carbonizing for a certain period of time (carbonization process). After that, the coke cake 15 in each carbonization chamber 10 is extruded by the ram beam 14 of the extruder (coke extrusion process), and then the carbon incineration lance 11 is inserted into each carbonization chamber 10 through the charging port 13 and oxygen-containing gas is blown into the carbonization chamber 10. (Carbon removal step) and coal is charged again (Coal charging step) The cycle is repeated. In addition, the code|symbol 16 in FIG. 1 is a rising pipe for exhausting the gas generated in the carbonization chamber 10. FIG. 1(B) is a schematic diagram of the coal charging process, FIG. 1(C) is a schematic diagram of the coke extrusion process, and FIG. 1(D) is a schematic diagram of the carbon removal process.

Next, the state of adhesion and clogging of carbon, as well as outflow of COG and generation of black smoke due to opening of joints due to carbon removal, will be explained with reference to FIGS. 2(A) to 2(C).
The gas generated during coke carbonization contains hydrocarbon gas, and as this gas undergoes thermal decomposition in the high-temperature carbonization chamber 10, carbon is transferred to the coke surface, furnace wall surface, and furnace top space. generate.
The generated carbon adheres to the joints of the furnace wall bricks and becomes protective carbon, but if the amount of adhesion is excessive, it becomes a protrusion that becomes a resistance during coke extrusion, causing extrusion problems such as clogging and holding back. It becomes a factor.
On the other hand, if the amount of carbon deposited is too small, there is no protective carbon layer that seals the furnace wall joints, so COG generated in the carbonization chamber 10 leaks into the adjacent combustion chamber 17 through the joints, and the combustion chamber 17 Poor combustion occurs and black smoke is generated.
As described above, if the removal of adhering carbon is excessive, black smoke will be generated in the combustion chamber 17, and if the removal of carbon is insufficient, clogging will occur during coke extrusion.

The CO concentration of the combustion exhaust gas passing through the combustion chamber 17 is a guideline for the ventilation status (perforation status and removal status of attached carbon) of the joints of the refractory (bricks) placed between the carbonization chamber 10 and the combustion chamber 17. becomes. That is, while coal is being carbonized in the carbonization chamber 10, COG is generated in the carbonization chamber 10, and the COG is supplied to the combustion chamber 17 through the damaged part of the joint, increasing the CO concentration of the combustion exhaust gas in the combustion chamber 17. If this COG supply amount increases, it will lead to the generation of black smoke.
Therefore, the inventors of the present application focused on quantitatively evaluating the amount of COG that passes through the damaged part of the joint and is supplied to the combustion chamber by managing the trend of the CO concentration of the combustion exhaust gas in the combustion chamber. Specifically, in order to quantitatively evaluate the amount of COG that is supplied to the combustion chamber through the damaged part of the joint, we conducted a study to quantitatively evaluate the amount of COG that is supplied to the combustion chamber through the damaged part of the joint. The idea was to measure the CO concentration of the combustion exhaust gas in the combustion chamber adjacent to the carbonization chamber from which CO was removed.

As shown in Figure 3 (A), the actual measured value of CO concentration of combustion exhaust gas during coal carbonization operation is determined by a preset management standard value (for example, the upper limit of the numerical range of CO concentration that is considered normal: the standard). Line) If it exceeds A, it means that the amount of COG supplied to the combustion chamber through the brick joints is increasing.
Here, although the situation shown in Figure 3 (A) is in a situation where the occurrence of clogging is suppressed, the amount of COG supplied to the combustion chamber increases and can be interpreted as a sign of black smoke generation. Weaken the operating conditions during the carbonization removal operation in the carbonization chamber. Note that the operating conditions refer to the blowing time of the oxygen-containing gas and the blowing amount of the oxygen-containing gas per unit time (the same applies hereinafter), and are usually applied during the carbon removal operation in the carbonization chamber performed before the coal carbonization operation. The operating conditions are the same as the operating conditions of Reduce the amount of gas blown. The blowing time and the blowing amount of this oxygen-containing gas can be adjusted based on past operational results, for example.

As a result, the amount of carbon adhering to the joints to be removed is reduced, so at the initial stage of coal carbonization, which is performed after this carbon removal operation, the amount of COG supplied to the combustion chamber through the joints is reduced, and the amount of COG in the combustion exhaust gas in the combustion chamber is reduced. The CO concentration is reduced and black smoke can be prevented from occurring.
For example, the solid line shown in FIG. 3(B) is the result of weakening the operating conditions during the above-described carbon removal operation. The CO concentration on the vertical axis may be affected by changes in the amount of carbon adhesion at the joints during carbonization operation. For example, by relaxing the degree of removal of adhering carbon, the amount of COG flowing into the combustion chamber may be reduced. The CO concentration falls below the control standard value A, and furthermore, carbon components adhere to the joints due to volatile matter generated immediately after charging the coal, which further reduces the amount of COG flowing into the combustion chamber and lowers the CO concentration. To go.

Note that the broken line shown in Figure 3(B) is the result when the operating conditions during the adhering carbon removal operation described above are not weakened (when the adhering carbon removal is excessive), and COG passes through the brick joints. The amount supplied to the combustion chamber has not decreased, and the CO concentration has become higher than the control standard value A.
Specifically, once a hole is opened in a brick joint and COG continues to flow into the combustion chamber through the hole during carbonization operation, the flow rate increases and it becomes difficult for carbon to remain in the hole. This causes poor combustion and lowers the temperature of the furnace wall, inhibiting carbon formation in the pores, which tends to open the pores and rather increases the amount of COG passing through.

In addition, as shown in the solid line in Figure 3 (C), the actual value of the CO concentration in the combustion exhaust gas during coal carbonization operation is determined by a preset control standard value (for example, within the numerical range of CO concentration that is considered normal). Lower limit value: Reference line) If it is below B, it means that carbon is attached excessively.
Here, the situation shown in Fig. 3(C) can be interpreted as a sign that there is no COG supplied to the combustion chamber and clogging with carbon occurs. strengthen operating conditions. Note that these operating conditions are normally the same as those for removing carbon deposited in the carbonization chamber before the coal carbonization operation, and the actual measured value of the CO concentration in the combustion exhaust gas during the next coal carbonization operation is controlled. In order to achieve the reference value B or more, the operating condition for blowing the oxygen-containing gas is extended, and/or the amount of oxygen-containing gas blowing per unit time is increased. The blowing time and the blowing amount of this oxygen-containing gas can be adjusted based on past operational results, for example.
This increases the amount of carbon adhering to the joints and furnace walls that is removed, which increases the CO concentration in the flue gas in the combustion chamber, as shown by the broken line in Figure 3 (C), and prevents clogging. can.

The CO concentration of the flue gas in the combustion chamber described above can be obtained, for example, by pulling out the flue gas through piping and measuring it in the process of being discharged from the combustion chamber as flue gas. As long as it can be determined, the measuring method is not particularly limited.
In addition, for the actual measured value of CO concentration of combustion exhaust gas during coal carbonization operation, for example, the average value of CO concentration during one coal carbonization operation over several tens of hours is used, and this average value and the above-mentioned control standard value are used. Although it is preferable to compare A and B, the average value of the CO concentration during a specific period of one coal carbonization operation (for example, the second half of the carbonization operation) can also be used as the average value. In addition, the measured value of the CO concentration itself is used as the actual value, and whether this measured value exceeds the control standard value A or is less than the control standard value B once or twice or more. If not, the actual measured value and the management reference values A and B may be compared.

The management reference value can be set, for example, as follows for the two combustion chambers a and b adjacent to the carbonization chamber. The management standard value (CO concentration upper limit) of one combustion chamber a is CT1, the management standard value (CO concentration lower limit) is CB1, and the management standard value (CO concentration upper limit) of the other combustion chamber b is CT2, management standard. The value (lower limit of CO concentration) is set as CB2 (CT1>CB1, CT2>CB2).
1) The four management reference values CT1, CT2, CB1, and CB2 are different (that is, CT1≠CT2 and CB1≠CB2).
2) The two management reference values CT1 and CT2 are the same, and the two management reference values CB1 and CB2 are the same (ie, CT1=CT2 and CB1=CB2).
3) Two management reference values CT1 and CT2 are the same, or two management reference values CB1 and CB2 are the same (ie, CT1=CT2 or CB1=CB2).

In setting the control standard value in 1) above, the criteria for comparing the actual measured value of CO concentration of combustion exhaust gas during coal carbonization operation with the control standard value are different on both sides of the carbonization chamber, but in the case of one combustion chamber. When the conditions of the control standard value are met, it is sufficient to decide whether to shorten or extend the time of blowing oxygen-containing gas, or to reduce or increase the amount of blowing oxygen-containing gas per unit time (see 3 above). The same applies to setting management standard values).
In addition, when setting the control reference value, there may be a case where the control reference value CT1 of one combustion chamber a becomes equal to or less than the control reference value CB2 of the other combustion chamber b (CT1≦CB2). They have not experienced it. If such a situation occurs, it is best to remove the adhering coke manually by an operator.
Shortening or extending the blowing time of the oxygen-containing gas, or decreasing or increasing the blowing amount of the oxygen-containing gas per unit time can be adjusted based on past operational results, for example.

The comparison of the above-mentioned measured value with the control reference value and the adjustment of the blowing time and blowing amount of the oxygen-containing gas can be automatically performed by, for example, a control unit (computer) of the coke oven equipment.
Specifically, the CO concentration of the combustion exhaust gas measured during the coal carbonization operation after performing the carbonization removal operation of the carbonization chamber is continuously or intermittently transmitted to the control unit in real time (sequentially). The control unit performs preset processing on the transmitted CO concentration measurement value, calculates the above-mentioned actual measurement value of the CO concentration of the combustion exhaust gas, and calculates the CO concentration management standard value of the combustion exhaust gas and the combustion exhaust gas. and the actual measured value of CO concentration. The control unit then adjusts the blowing time and/or the blowing amount of the oxygen-containing gas during the carbon removal operation in the carbonization chamber performed after the coal carbonization operation. The time and amount of oxygen-containing gas to be blown are determined based on, for example, the difference between the control standard value of the CO concentration of the flue gas and the actual value of the CO concentration of the flue gas, which was obtained based on past operational results. It can be adjusted accordingly.
Note that the above operations can also be performed manually by the operator.

Next, examples performed to confirm the effects of the present invention will be described.
<Confirmation of clogging prevention effect>
The following clogging occurrence rate was calculated for a certain coke oven.
For comparison, we calculated the clogging occurrence rate due to carbon over a one-year period using conventional technology (a method in which carbon adhering to the carbonization chamber is not removed, and adhering carbon is removed manually when clogging occurs; the same applies hereinafter). Calculated.
The method described in Patent Document 2 described above (injecting oxygen-containing gas into the carbonization chamber, and stopping the injection of oxygen-containing gas when the oxygen concentration of the exhaust gas discharged from the carbonization chamber reaches a predetermined value, the same applies hereinafter) was carried out for several years. The carbon-induced clogging occurrence rate during the last year when the clogging was most suppressed was calculated as a percentage of the number of times, and the occurrence rate was expressed as an index with the above-mentioned conventional technology occurrence rate set as 100.
As a result, the indexed incidence was approximately 60.
The method of the present invention (combustion chamber CO concentration management, the same applies hereinafter) was implemented for two years, and the occurrence rate of carbon-induced clogging in the latter half of the year was calculated as a percentage of the number of times, and the occurrence rate of the conventional technology described above was set as 100. The rate was expressed as an index.
As a result, the indexed incidence was approximately 40.

<Confirmation of effectiveness in preventing black smoke generation>
We investigated the black smoke generation situation in a certain coke oven. In reality, no black smoke was generated, so a comparison was made regarding the risk of black smoke generation (CO concentration in exhaust gas, where the concentration at which black smoke occurs is defined as 100, and the CO concentration rises to 60 or higher).
For comparison, the ratio of the number of times that the risk of black smoke generation occurred in one year using the conventional technology was calculated.
Using the method described in Patent Document 2 described above, the ratio of the number of times a risk of black smoke generation occurred during the period in which the clogging situation was confirmed was calculated, and the number ratio of the conventional technology was set as 100, and the number ratio was converted into an index.
As a result, the number of times indexed was approximately 50.
Using the method of the present invention, the number of times a risk of black smoke generation occurred during the period in which the clogging situation was confirmed was calculated, and the number of times the number of times the risk of black smoke generation occurred was calculated, and the number of times was expressed as an index, with the number of times of the prior art being set as 100.
As a result, the number of times indexed was approximately 35.

From the above, according to the present invention, adhering carbon can be left in the carbonization chamber, especially at the joints of the carbonization chamber bricks, to the extent that the flow of COG is stopped, and at the same time, clogging can be prevented when carbonization coke is pushed out from the carbonization chamber. It has become possible to remove adhering carbon, and it has been found that the effect of reducing both the clogging rate and the black smoke generation rate (possible risk of occurrence) can be obtained at the same time.

Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the configuration described in the embodiments described above, and the matters described in the claims are as follows. It also includes other embodiments and modifications that may be considered within the scope. For example, it is also within the scope of the present invention to configure a method for removing deposited carbon in a coke oven carbonization chamber of the present invention by combining some or all of the above-described embodiments and modifications.
In the embodiment described above, a set of control reference values serving as an upper limit of CO concentration and a lower limit of CO concentration is set for the combustion chambers on both sides of the carbonization chamber, respectively, and a control standard for the upper limit of CO concentration of at least one combustion chamber is set. A case has been described in which the blowing time and blowing amount of oxygen-containing gas during the adhesion carbon removal operation are adjusted when the CO concentration exceeds the lower limit of the control standard value or when the CO concentration falls below the lower limit control standard value.
However, for example, depending on the situation of the carbonization chamber and the combustion chamber adjacent to the carbonization chamber, 1) a set of control reference values as an upper limit and a lower limit of CO concentration may be set for only one combustion chamber; 2) Set only one of the CO concentration upper limit and CO concentration lower limit management standard values for the adjacent combustion chambers or one combustion chamber, and adjust the oxygen concentration during the carbon removal operation according to this management standard value. It is also possible to adjust the blowing time and amount of the contained gas.

10: Carbonization chamber, 11: Carbon incineration lance, 12: Coal, 13: Charging port, 14: Ram beam, 15: Coke cake, 16: Riser pipe, 17: Combustion chamber

Claims (2)

A method for removing adhered carbon in a coke oven carbonization chamber, in which a lance is inserted into the carbonization chamber and oxygen-containing gas is blown into the carbonization chamber to oxidize and remove the adhered carbon in the carbonization chamber using the heat retained in the carbonization chamber.
During a coal carbonization operation after carrying out an operation for removing adhering carbon in the carbonization chamber, measuring the CO concentration of the combustion exhaust gas passing through a combustion chamber adjacent to the carbonization chamber from which adhering carbon has been removed,
Comparing a preset control standard value of the CO concentration of the combustion exhaust gas in the combustion chamber with the measured value of the CO concentration of the combustion exhaust gas,
On the condition that the actual measured value exceeds the control standard value, the blowing time of the oxygen-containing gas during the carbon removal operation in the carbonization chamber performed after the coal carbonization operation is shortened, and/or the oxygen-containing gas is A method for removing carbon deposited in a coke oven carbonization chamber, which is characterized by reducing the amount of blowing per unit time. A method for removing adhered carbon in a coke oven carbonization chamber, in which a lance is inserted into the carbonization chamber and oxygen-containing gas is blown into the carbonization chamber to oxidize and remove the adhered carbon in the carbonization chamber using the heat retained in the carbonization chamber.
During a coal carbonization operation after carrying out an operation for removing adhering carbon in the carbonization chamber, measuring the CO concentration of the combustion exhaust gas passing through a combustion chamber adjacent to the carbonization chamber from which adhering carbon has been removed,
Comparing a preset control standard value of the CO concentration of the combustion exhaust gas in the combustion chamber with the measured value of the CO concentration of the combustion exhaust gas,
On the condition that the actual measured value is less than the control standard value, extending the blowing time of the oxygen-containing gas during the carbon removal operation in the carbonization chamber performed after the coal carbonization operation, and/or extending the blowing time of the oxygen-containing gas A method for removing deposited carbon in a coke oven carbonization chamber, which is characterized by increasing the blowing amount per unit time.

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