JP7243285B2 - Method and apparatus for burning and removing adhering carbon at base of coke riser - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for burning and removing deposited carbon at the base of a coke riser.

Raw gas (carbonization gas) generated from coal during carbonization in a coke oven passes through a riser pipe installed at the top of the coke oven and is usually sent to the dry main for recovery. Since the raw gas and pulverized coal accompanying the raw gas pass through the riser pipe, carbon adheres and grows on the base of the riser pipe. If such events continue and the base of the riser is clogged with adhered carbon, the raw gas generated in the furnace cannot be recovered, leading to shutdown of the coke oven. Therefore, for stable coke production, it is necessary to periodically remove the carbon adhering to the base of the riser.

As described in Patent Literature 1, various developments have been made on devices for removing carbon adhering to the base of the rising pipe.

Japanese Patent No. 4358314

However, a device that can be used continuously has not yet been developed, and as shown in FIG. 8, workers currently use a rod-shaped jig to clean by dropping. This work is hard work performed in a hot environment, and the workload is extremely large. In addition, since the work is done manually, the cleaning frequency per kiln is only once every 3 to 4 days, and there is a high risk of overlooking the clogging of the rising pipe due to the carbon deposits. For the reasons described above, there is a strong demand for a simple and efficient cleaning operation of carbon adhering to the base of the riser pipe.

The present invention was made against such a background, and the problem to be solved by the present invention is to make it possible to easily and efficiently clean carbon adhering to the base of the riser pipe.

In order to solve the above problems, an air blowing device consisting of a nozzle installed in the upper part of the coke riser pipe blows air to the carbon adhering to the base of the riser pipe with an ejector effect, and burns and removes the adhering carbon. A method for burning and removing adhering carbon at the base of the coke riser.

Moreover, it is preferable to blow air having a flow rate of 1150 Nm ³ /h or more to the base of the riser for 20 minutes or more.

Moreover, it is preferable that the total amount of air Q [Nm ³ /h] obtained by the following formula 1 is 1150 Nm ³ /h or more.
Q = (A x α + B x V + C) x V … (Formula 1)
where, A: Coefficient of nozzle angle influence [1/°], B: Coefficient of nozzle total air amount influence [h/(Nm ³ )], C: Constant [-], α: Nozzle angle [°], V : Nozzle total air amount [Nm ³ /h].

Further, it is preferable that the number of nozzles is 2, the nozzle angle of each nozzle is 0°, and the adhering carbon is removed with a nozzle arrangement that satisfies Equation 2 below.
(Lx)/D≧4.4 (Formula 2)
Here, L: riser pipe height (TOP to just above the base) [mm], D: riser pipe diameter [mm], x: air spray nozzle tip position (riser pipe TOP reference) [mm].

Further, the apparatus for burning and removing deposited carbon at the base of the coke riser is characterized in that at least two or more air blowing nozzles are arranged in the upper part of the coke riser.

In addition, the number of nozzles is two, the nozzle angle of each nozzle is 0 °, and the nozzle arrangement satisfies the following equation 2. Carbon deposited at the base of the coke riser according to claim 5. Combustion removal device.
(Lx)/D≧4.4 (Formula 2)
Here, L: riser pipe height (TOP to just above the base) [mm], D: riser pipe diameter [mm], x: air spray nozzle tip position (riser pipe TOP reference) [mm].

By using the present invention, it is possible to easily and efficiently clean carbon adhering to the base of the riser pipe.

FIG. 4 is a schematic diagram of a state in which the nozzle of the Air blowing device is attached to the riser pipe of the coke oven. It is the figure which showed the result of the Air injection test in an actual machine. FIG. 10 is a diagram showing the relationship between "nozzle angle (inclination from vertically downward)" and "total air amount (nozzle total air amount + accompanying air amount)/nozzle total air amount". FIG. 10 is a diagram showing the relationship between "nozzle air amount" and "total air amount (nozzle total air amount + accompanying air amount)/nozzle total air amount"; FIG. 10 is a diagram showing the correlation between measured values and estimated values based on Equation 1; FIG. 5 is a diagram showing the wind speed distribution at the base during air blowing with various nozzle specifications. FIG. 10 is a diagram showing the relationship between “(L−x)/D” and “standard deviation of base wall surface air flow velocity” when the number of nozzles is two and the nozzle angle of both nozzles is 0°. FIG. 10 is a diagram showing a state in which carbon adhering to the base of the rising pipe is pushed down by a rod-shaped jig;

Modes for carrying out the invention are shown below. As can be seen from FIG. 1, the method for burning and removing the deposited carbon on the base 82 of the coke riser 81 of this embodiment uses an air nozzle 21 installed at the top of the coke riser 81 Air is blown onto the carbon 91 adhering to the base portion 82 of the riser pipe 81 from a blowing device with an ejector effect to burn off the adhering carbon 91 . Therefore, the work of cleaning the carbon 91 adhering to the base portion 82 of the rising pipe 81 can be performed simply and efficiently. The riser pipe 81 is part of a path for sending the raw gas generated in the coke oven 1 to the dry main 83 during operation of the coke oven 1, and is provided at the top of the coke oven 1. .

In addition, in the apparatus for burning and removing deposited carbon at the base 82 of the coke riser 81 of the embodiment, at least two or more air blowing nozzles 21 are arranged in the upper part of the coke riser 81 . By using this attached carbon burning and removing device, it is possible to easily and efficiently clean the carbon 91 attached to the base portion 82 of the riser pipe 81 .

FIG. 1 shows an outline of the air blowing equipment for the rising pipe 81 according to the present invention. In the present invention, during the empty kiln period (~20 min) from the end of coke extrusion to the start of coal charging, the TOP cover 84 provided on the upper part of the riser pipe 81 was opened and installed at the upper part of the inside of the riser pipe 81. Air is blown from the nozzle 21 toward the base 82. - 特許庁At this time, due to the ejector effect, a large amount of accompanying Air is supplied to the base portion 82 of the riser pipe 81 from the upper opening of the riser pipe 81 to burn the adhering carbon 91 . In other words, when the air introduced from the upper part of the riser pipe 81 and the accompanying air flow into the sufficiently heated furnace interior, the mass of carbon 91 attached around the base 82 of the riser pipe 81 is burned. will be used for The combustion gas is discharged outside the system from a combustion gas discharge mechanism installed above the C/S of the coke oven 1 .

By the way, in combustion removal by air blowing, it is preferable to avoid consumption of blown air for combustion with raw gas. For this reason, after pushing out the coke in the furnace, it is carried out in a short time (generally about 20 minutes or less) in an empty kiln state until the next coal is charged. Further, if the amount of air blown onto the base 82 is uneven, there is a concern that only a portion of the base 82 can be cleaned and the growth of the adhered carbon 91 cannot be suppressed. Moreover, when excessively blowing air onto a portion of the base 82, there is a concern that the bricks of the base 82 may be damaged by overheating (≧1100° C.) or overcooling. Therefore, in order to properly burn and remove adhering carbon by blowing air, it is preferable to uniformly blow the required amount of air in the circumferential direction of the base 82 within a limited time.

Here, a test for burning and removing the adhering carbon 91 on the base 82 using an actual machine will be described. Three levels were tested. In Level 1, the non-cleaning period (carbon 91 deposition period) is 1 day, and the total amount of air sent to the base 82 to burn the carbon 91 deposited during this period is 682 Nm ³ /h. Change in carbon 91 was observed 0, 10, and 20 minutes after sending Air. In Level 2, the non-cleaning period was set to 1 day, and the change in carbon 91 was observed after 0, 10, and 20 minutes when the total amount of air was set to 1149 Nm ³ /h. In Level 3, the non-cleaning period was set to 4 days, and the change in carbon 91 was observed after 0, 10, and 20 minutes when the total amount of air was set to 2361 Nm ³ /h. Figure 2 shows the results of an air blowing test on an actual machine. The total amount of air is the sum of the total amount of nozzle air and the amount of accompanying air due to the ejector effect.

From FIG. 2, in order to remove the attached carbon 91 or suppress its growth in the limited empty oven period of about 20 minutes, the total amount of air supplied to the base 82 of the rising pipe 81 is 1149 Nm ³ /h of level 2 ≒ 1150Nm ³ /h or more is good. That is, if air having a flow rate of 1150 Nm ³ /h or more is blown to the base portion 82 of the riser pipe 81 for 20 minutes or longer, it is possible to remove the adhered carbon 91 or suppress the growth of the adhered carbon 91 . If a large amount of air is blown from the nozzles 21 so that the total amount of air is covered only by the nozzles 21, the number of nozzles 21 and the number of compressors increase, which causes problems in terms of cost and maintainability. However, in the present invention, since outside air is introduced into the riser pipe 81 by the ejector effect, a large amount of air can be uniformly blown to the base 82 of the riser pipe 81 with a small amount of air discharged from the nozzles 21. can avoid such problems.

Next, a method for estimating the total amount of air blown to the base portion 82 of the rising pipe 81 in the present invention will be described. The amount of air accompanying the ejector effect can be estimated from the angle of the nozzle 21 and the amount of air discharged from the nozzle 21 . As the nozzle angle tilts in the horizontal direction with respect to the vertical downward direction, the downward velocity component becomes smaller, so the accompanying Air amount becomes smaller. Further, when the total amount of air increases, the pressure inside the furnace rises and the amount of accompanying air decreases.

FIG. 3 shows the relationship between the "nozzle angle" and the "total air amount (nozzle total air amount + accompanying air amount)/nozzle total air amount". FIG. 4 shows the relationship between the "nozzle total air amount" and the "total air amount (nozzle total air amount + accompanying air amount)/nozzle total air amount".

As can be seen from FIGS. 3 and 4, the following formula 1 for estimating the total air amount Q [Nm ³ /h] from the nozzle angle α [°] and the nozzle total air amount V [Nm ³ /h] is can get. It is preferable that the total amount of air calculated by the formula 1 is 1150 Nm ³ /h or more.
Q = (A x α + B x V + C) x V … (Formula 1)
A: Coefficient of nozzle angle influence [1/°]
B: Coefficient of influence of nozzle total air amount [h/(Nm ³ )]
C: constant [-]
(In the embodiment: A=-0.06, B=-0.02, C=14.33)
In addition, FIG. 5 shows the correlation between the measured values and the estimated values obtained by the equation (1).

Next, a nozzle design for uniformly blowing Air onto the base 82 will be described. From the viewpoint of maintenance, the fewer the number of nozzles 21, the better. In particular, when maintainability is required, one or two is preferable. As the number of nozzles 21 increases, the flow rate of air discharge decreases and the amount of accompanying air decreases. For the same reason, the nozzle 21 preferably has a diameter of about 30 mm. This is because, as the diameter of the nozzle 21 increases, the flow rate of air discharge decreases and the accompanying air amount decreases.

By the way, structurally, it is advantageous in terms of maintenance to dispose the nozzle 21 at a position close to the wall surface of the riser pipe 81 . However, if one nozzle 21 is installed in the center of the riser pipe 81, if the amount of carbon 91 that cannot be removed by air blowing for a short time is attached, or if there is a problem with the air blowing device, the carbon will be removed manually. It becomes difficult to carry out the plunge work of 91. Therefore, it is desirable to attach the nozzle 21 to the end within the riser pipe 81 .

FIG. 6 shows the wind speed distribution of the base 82 during air blowing. As can be seen from FIG. 6, the number of nozzles 21 is desirably two or more. That is, it is preferable that at least two air blowing nozzles 21 are arranged in the upper part of the coke riser 81 . Also, the smaller the nozzle angle α, the better. If the number of nozzles 21 increases, the speed of air discharged from the nozzles 21 decreases, and the amount of accompanying air due to the ejector effect decreases. However, increasing the total amount of air in the nozzle is not desirable because it increases the equipment cost of the compressor and blower. Further, as described above, the apparatus maintenance load increases as the number of nozzles 21 increases, so an excessive increase in the number of nozzles 21 is not desirable. Considering these factors comprehensively, it is desirable that the number of nozzles 21 is two. Moreover, it is preferable that the nozzle angle of each nozzle 21 is 0°.

FIG. 7 shows a simulation result of air blowing to the base portion 82 of the rising pipe 81 when the number of nozzles 21 is two and the nozzle angle of both nozzles 21 is 0°. In order to uniformly blow Air onto the base 82 regardless of the size of the riser pipe 81 and the nozzle Air discharge flow rate, the size (L, D) of the riser pipe 81 and the distance from the TOP of the riser pipe 81 to the tip of the nozzle 21 ( It is necessary to determine the relationship of x) within a range that satisfies Equation 2.
(Lx)/D≧4.4 (Formula 2)
L: Ascending tube height (TOP to just above the base) [mm]
D: Ascending pipe diameter [mm]
x: Air spray nozzle tip position (rising tube TOP reference) [mm]

By the way, there are two methods for removing the adhering carbon 91: a method of mechanically pushing it down, and a method of removing it by burning with air. However, there is a great concern that the mechanical drop method will damage the bricks of the base 82 . Therefore, it is not suitable for automation. On the other hand, combustion removal by air can be automated.

Although the present invention has been described above with a focus on the embodiments, the present invention is not limited to the above embodiments, and various aspects are possible.

21 Nozzle 81 Ascending pipe 82 Base 91 Adhering carbon

Claims (6)

From the air blowing device consisting of two or more nozzles installed along the upper wall surface inside the coke riser , the outside air without the atmosphere in the furnace becomes entrained air , and the carbon adhering to the base of the riser with an ejector effect. A method for burning and removing deposited carbon at the base of a coke riser, characterized in that the deposited carbon is removed by burning. 2. The method for burning and removing deposited carbon at the base of the coke riser according to claim 1, wherein Air having a flow rate of 1150 Nm ^<3> /h or more is blown to the base of the riser for 20 minutes or longer. 3. The method for burning and removing deposited carbon at the base of the coke riser according to claim 1 or 2, wherein the total amount of air Q [ ^Nm3 /h] obtained by the following formula 1 is ^1150Nm3 /h or more.
Q = (A x α + B x V + C) x V … (Formula 1)
here,
A: Coefficient of nozzle angle influence [1/°]
B: Coefficient of nozzle air amount influence [h/(Nm ³ )]
C: constant [-]
α: Nozzle angle [°]
V: Nozzle total air volume [Nm ³ /h] 4. Any one of claims 1 to 3, characterized in that the number of nozzles is two, the nozzle angle of each nozzle is 0°, and adhering carbon is removed with a nozzle arrangement that satisfies Equation 2 below. 2. The method for burning and removing deposited carbon at the base of the coke riser according to 1.
(Lx)/D≧4.4 (Formula 2)
here,
L: Ascending tube height (TOP to just above the base) [mm]
D: Ascending pipe diameter [mm]
x: Air spray nozzle tip position (rising tube TOP reference) [mm] Combustion of adhering carbon at the base of the coke riser, characterized in that at least two or more air blowing nozzles are arranged along the inner upper wall surface of the coke riser at a position where the outside air without the atmosphere in the furnace is accompanied by air. removal device. The number of nozzles is two, the nozzle angle of each nozzle is 0 °, and the nozzle arrangement satisfies the following equation 2. Burning and removing deposited carbon at the base of the coke riser according to claim 5. Device.
(Lx)/D≧4.4 (Formula 2)
here,
L: Ascending tube height (TOP to just above the base) [mm]
D: Ascending pipe diameter [mm]
x: Air spray nozzle tip position (rising tube TOP reference) [mm]

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