JP2006070124A - Coke oven and method for controlling temperature of upper part of coke oven carbonization chamber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coke oven having a new structure, capable of controlling the temperature of the upper part of a carbonization chamber and to provide a method for controlling the temperature of the upper part of the carbonization chamber of the coke oven. <P>SOLUTION: In the coke oven in which a heat storage chamber is installed in the lower part of an oven body and a combustion chamber and a carbonization chamber are alternately arranged in the upper part and coke dry-distilled in the carbonization chamber is pushed out from PS (pusher side) of the oven body to CS (coke side), a horizontal flue extending to oven length direction (direction pushing out coke from PS of the oven body to CS) and opening to PS and CS of the oven body is installed above the combustion chamber or in the upper part of the combustion chamber and a combustion apparatus for introducing a combustion exhaust gas into the end of the horizontal flue. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a coke oven for carbonizing coal in a carbonization chamber, and more particularly to a coke oven capable of controlling the temperature of the upper portion of the carbonization chamber.

  The coke oven includes a carbonizing chamber for carbonizing coal, a combustion chamber for burning fuel gas, a heat storage chamber for using preheating of combustion exhaust gas, and a solid refuge at the bottom of the heat storage chamber. The combustion chamber is subdivided into a number of vertical flues.

  For the heating of the furnace, a coke oven gas (rich gas) having a high calorific value, a blast furnace gas having a low calorific value, or a mixed gas (poor gas) of coke oven gas and blast furnace gas is used. In the case of rich gas heating, only the air is preheated in the heat storage chamber, and the rich gas is supplied to each vertical flue without passing through the heat storage chamber. In the case of poor gas heating, air and poor gas are preheated in separate heat storage chambers through the sole flue at the bottom of the heat storage chamber and enter the vertical flue. In the vertical flue, the poor gas and air associate and burn, and the flue gas is further drawn down to another heat storage chamber, heating the heat storage bricks in the heat storage chamber and passing through the sole flue to the flue. In the coke oven, preheating and heat storage are repeated, and the direction of gas flow is changed every 20 to 30 minutes in order to increase thermal efficiency.

  The upper part of the carbonization chamber is a space in which no coal is charged, and the carbonization gas escapes from this upper space during the coal distillation. It is said that the temperature of the upper space of the carbonization chamber is determined by the following factors (1) to (4). (1) Combustion chamber upper temperature, (2) Combustion chamber dimensions, height, shape, (3) Charging properties (volatiles), (4) Charging amount (height).

  Conventionally, the temperature of the upper space of the carbonization chamber is said to be optimal at 750 to 800 ° C. In normal operation, (2), (3) and (4) cannot be changed, only the Coppers coke oven has an adjustment function on the structure of the upper part of the combustion chamber, and (1) the upper temperature of the combustion chamber can be adjusted. Met.

  FIG. 7 shows a cross section along the furnace length direction of the combustion chamber of the Coppers coke oven described in Patent Document 1. FIG. 7 shows a so-called dual furnace heated by a rich gas or a poor gas.

  In the case of the rich gas heating, the rich gas is supplied to the vertical flues 3 that alternately lead upward through the rich gas nozzles 1 or 2. Combustion air is supplied through the heat storage chamber into the vertical flue 3 that similarly leads upward through the outflow openings 5, 6, 7. The combustion chamber employs a hairpin flue and two adjacent vertical flues 3 and 3a are joined at the top. One of the dual vertical flues 3 and 3a alternately burns while exhausting exhaust gas downward while guiding rich gas and air upward, alternately with the other vertical flue.

  In the case of the poor gas heating, the poor gas from the blast furnace gas and the coke oven gas is preheated in the heat storage chamber and then supplied through the outflow opening 7 at the bottom of the vertical flue. Combustion air is supplied through the heat storage chamber into the vertical flue 3 that similarly leads upward through the outflow openings 5 and 6. The exhaust gas generated in the vertical flue 3 leading upward flows over the adjacent vertical flue 3a leading downward through the opening of the connecting wall on the upper side, the opening 5 and the hollow communication passage 8 in this vertical flue 3a and the bottom opening 6, 7 and through the heat storage chamber.

In the upper part of the combustion chamber, an auxiliary flame passage 9 is provided to adjust the temperature of the upper space of the carbonization chamber. The partition wall 10 that separates the auxiliary flame path 9 and the ceiling of the combustion chamber is provided with an opening 10a that allows the combustion chamber and the auxiliary flame path 9 to communicate with each other, and the partition wall 10 is opened and closed by a pair of air volume adjusting dampers 4 (slide bricks). Blocked as possible. When a person opens the air volume adjusting damper 4 completely or partially from the inspection hole 10b using a hook, the combustion gas flows into the auxiliary flame path, and the temperature of the upper portion of the carbonization chamber is adjusted.
Japanese National Patent Publication No. 4-501876

Problems arise if the temperature of the space above the carbonization chamber where the coal is not charged is too high or too low.
If the temperature in the upper part of the carbonization chamber is too high, carbon deposits and adheres to the upper part of the carbonization chamber, so that it is not possible to perform the coal loading operation for charging the coal or the leveling operation to level the coal. Any attempt to remove the adhering carbon must be done manually, thereby damaging the brick. On the other hand, if the temperature of the lower part of the carbonization chamber is too low, the upper coal will be in the dry distillation, and it will be necessary to extend the dry distillation time.

  Only in the Coppers type coke oven, the upper part of the combustion chamber has a two-stage structure, and the temperature of the upper part of the carbonization chamber can be controlled by adjusting the amount of gas introduced into the auxiliary flameway. However, if the air volume adjustment damper is closed in order to adjust the amount of gas introduced into the auxiliary flameway, there is a drawback that observation of the combustion chamber through the inspection hole becomes impossible.

  Therefore, an object of the present invention is to provide a coke oven having a new structure capable of adjusting the temperature of the upper part of the coking chamber and a method for controlling the temperature of the upper part of the coking chamber of the coke oven.

  In order to solve the above-mentioned problem, the invention of claim 1 has a heat storage chamber in the lower part of the furnace body, and combustion chambers and carbonization chambers are alternately arranged in the upper part, and coke that has been carbonized in the carbonization chamber is obtained. In a coke oven that pushes from the PS (pusher side) of the furnace body toward CS (coke side), it extends in the furnace length direction (direction in which coke is pushed from the PS of the furnace body toward CS) above or above the combustion chamber. In addition, a horizontal flue opening to the PS and / or CS of the furnace body is provided, and a combustion device for introducing combustion exhaust gas into the horizontal flue is provided at an end of the horizontal flue.

  According to a second aspect of the present invention, in the coke oven according to the first aspect, the horizontal flue and the combustion chamber are connected by a branch path.

  A third aspect of the present invention is the coke oven according to the first or second aspect, wherein two rows of the horizontal flue are provided between the carbonization chambers on both sides of the combustion chamber with respect to one combustion chamber. And

  According to a fourth aspect of the present invention, in the coke oven according to any one of the first to third aspects, the combustion device is a tubular combustion in which one end is opened and a slit is formed in the other end portion along the tube axis direction. And a nozzle for blowing a premixed gas composed of a fuel gas and an oxygen-containing gas having a flat tip shape and a reduced opening area, and the nozzle for blowing the premixed gas is connected to the slit And is provided toward the tangential direction of the inner wall surface of the apparatus combustion chamber.

  According to a fifth aspect of the present invention, in the coke oven according to any one of the first to third aspects, the combustion device has a tubular combustion in which one end is opened and a slit is formed along the tube axis direction at the other end. A chamber, a nozzle for blowing a fuel gas having a flat tip shape and a reduced opening area, and a nozzle for blowing an oxygen-containing gas, and these gas blowing nozzles are connected to the slits and It is provided toward the tangential direction of the inner wall surface of the apparatus combustion chamber.

  The invention according to claim 6 is a coke characterized in that the coke oven according to claim 1 is used to control the temperature of the upper part of the carbonization chamber by introducing combustion exhaust gas from the combustion device into the horizontal flue. This is a temperature control method for the upper part of the furnace carbonization chamber.

  According to the first aspect of the present invention, the combustion exhaust gas from the combustion apparatus is introduced into the horizontal flue so that the temperature of the upper portion of the carbonization chamber can be appropriately controlled.

  According to the invention of claim 2, the heat of the combustion exhaust gas from the combustion burner can be stored in the heat storage chamber, and the heat of the combustion exhaust gas can be used effectively.

According to the invention of claim 3, heat can be evenly transferred to the carbonization chambers on both sides of the combustion chamber.
Furthermore, by providing combustion devices at both ends of the horizontal flue, the temperature of the horizontal flue due to the combustion exhaust gas can be made substantially uniform in the longitudinal direction.

  According to the invention of claim 4 or claim 5, a combustion apparatus capable of high-load combustion and having a very large combustion amount adjustment range is obtained, so that the combustion apparatus is suitable for heating the horizontal flue. .

  1 and 2 show a coke oven in one embodiment of the present invention. FIG. 1 shows a cross-sectional shape along the length of a coke oven furnace body (direction in which coke is pushed from PS (pusher side) to CS (coke side) of the furnace body). Both cross sections of the chamber 12 are shown. Of course, the carbonization chamber 11 and the combustion chamber 12 are actually displaced in the depth direction of FIG. FIG. 2 shows a cross-sectional shape of the furnace body orthogonal to the furnace length direction, and the carbonization chambers 11 and the combustion chambers 12 are alternately arranged. In FIG. 2, the number of the carbonization chambers 11 and the combustion chambers 12 is smaller than the actual number.

  There is a heat storage chamber at the lower part of the furnace body of the coke oven, and combustion chambers 12 and carbonization chambers 11 are alternately arranged at the upper part thereof. The carbonization chamber 11 has, for example, a length of 12 to 16 m, a height of 4 to 7 m, a width of 400 to 800 mm, and a coal charge amount of about 12 to 50 t. In order to facilitate the extrusion of coke, the width of the carbonization chamber of the CS with the coke guide wheel is wider than the PS with the extruder. When the carbonization chamber 11 is heated, a difference is made in the furnace wall temperature between the wide CS and the narrow PS.

  The combustion chamber 12 is subdivided into a number of vertical flues (heating flame paths), and in this embodiment, the combustion flues 13 and the drawn flues 13a arranged alternately constitute one combustion chamber. Such a combustion chamber 12 is called a twin flame path type (hairpin type).

  For the heating of the furnace, a coke oven gas (rich gas) having a high calorific value, a blast furnace gas having a low calorific value, or a mixed gas (poor gas) of coke oven gas and blast furnace gas is used. In the case of rich gas heating, only the air is preheated in the heat storage chamber, and the rich gas is supplied to each of the flues 13 and 13a through the outflow opening 20 without passing through the heat storage chamber.

  In the case of the poor gas heating, air and the poor gas are preheated in separate heat storage chambers through the sole flue in the lower part of the heat storage chamber, and then enter the combustion flue 13 through the outflow openings 14, 15, 16. The poor gas is introduced into the combustion flue 13 through the outflow opening 14 at the bottom of the combustion flue, and the air is supplied through the outflow opening 15 at the bottom of the flue and through the hollow communication passage 17 and the upper outflow opening 16. Led in. In the combustion flue 13, the poor gas and air are associated and burned. More specifically, the poor gas first burns at the bottom of the combustion flue provided with the lower outflow opening 15 for air, then undergoes secondary combustion at the portion provided with the upper outflow opening 16 and raises the combustion flue 13. (See also FIG. 3). The gas and air distribution adjustment in the furnace length direction is adjusted by, for example, an adjustment plate (nozzle plate) provided in the lower part of the heat storage chamber.

  The exhaust gas generated in the combustion flue 13 flows to the pulling flue 13a that guides the exhaust gas downward through the upper communication passage 18. The combustion exhaust gas is further drawn down to another heat storage chamber through the outflow openings 14, 15, 16, heats the heat storage brick in the heat storage chamber and passes through the sole flue in the lower portion of the heat storage chamber and enters the flue. In the coke oven, preheating and heat storage are repeated, and the gas flow direction is changed by switching between 13 and 13a every 20 to 30 minutes in order to increase thermal efficiency. This is called gas switching.

  The temperature of the combustion chamber 12 is measured with a thermocouple, the amount of fuel gas supplied to the sole flue is manipulated based on this measured value, and the temperature of the entire combustion chamber is controlled. In addition, the temperature of each combustion chamber 12 in the furnace length direction is measured by an optical temperature measuring device from the inspection hole 26, and the distribution of gas and air in each combustion chamber 12 is adjusted based on this measured value. Adjust the temperature gradient in the long direction.

  A circulation opening 19 is opened at the bottom of the partition that separates the combustion flue 13 and the withdrawal flue 13a. The combustion exhaust gas flows again into the combustion flue 13 from the circulation opening 19. As shown in FIG. 3, NOx in the combustion exhaust gas can be reduced by the two-stage combustion by providing the air outlet openings 15 and 16 in two stages and the circulation of the combustion exhaust gas.

  An auxiliary flame passage 21 is provided at the upper part of the combustion chamber 12 in order to adjust the temperature of the upper space of the carbonization chamber. The partition wall 22 that divides the auxiliary flame path 21 and the ceiling of the combustion chamber 12 is provided with an opening 23 that allows the combustion chamber 12 and the auxiliary flame path 21 to communicate with each other. The opening 23 has a pair of air volume adjustment dampers 25 (slide bricks, (See FIG. 4). As shown in FIG. 1, when a person opens the air volume adjustment damper 25 from the inspection hole 26 completely or partially using a hook as shown in FIG. 4A, the gas flows into the auxiliary flameway. The temperature at the top of the carbonization chamber is adjusted. FIG. 4B shows a state in which the opening 23 is closed by the air volume adjustment damper 25.

  As shown in FIGS. 1 and 2, a horizontal flue 27 extends in the furnace length direction above or above the combustion chamber 12 (above the ceiling of the combustion chamber 12 or above the combustion chamber 12 below the ceiling). Is provided. Both ends of the horizontal flue 27 open to PS and CS of the furnace body. The horizontal flues 27 are provided in two rows for one combustion chamber 12, and the two rows of horizontal flues 27 are provided between the carbonization chambers 11 on both sides of the combustion chamber 12 at positions on the left and right sides avoiding the inspection holes 26 ( (See FIG. 2). The two rows of horizontal flues 27 are preferably provided at the same height of the furnace body, but may be slightly different in height.

  At both ends of the horizontal flue 27, combustion burners 31 are provided as combustion devices for introducing combustion exhaust gas into the horizontal flue 27. The combustion burner 31 adjusts the amount of gas and the amount of air introduced, and adjusts the combustion exhaust gas temperature to 300 to 1300 ° C. An intermediate portion of the horizontal flue 27 is connected to a combustion chamber at a plurality of points by branch paths 32, and combustion exhaust gas from the combustion burner 31 is discharged to the upper portion of the combustion chamber. The combustion burner 31 burns at the same timing as the combustion time of the coke oven, and the combustion burner 31 also stops because the flue is switched during the time when the combustion of the coke oven is stopped. The structure of the combustion burner 31 will be described later.

  The temperature of the combustion chamber 12 is 1200 to 1300 ° C. On the other hand, it is said that the temperature of the upper part 33 of the carbonization chamber in which no coal is conventionally charged is optimally 750 ° C. to 800 ° C. If the temperature of the carbonization chamber upper portion 33 is too high, carbon is deposited and deposited on the carbonization chamber upper portion. On the other hand, if the temperature of the carbonization chamber upper portion 33 is too low, the upper coal becomes undried, and it is necessary to extend the carbonization time. End up.

  By introducing the combustion exhaust gas adjusted to a temperature of 300 to 1300 ° C. into the horizontal flue 27 as in this embodiment, the temperature of the upper carbonization chamber 33 can be controlled appropriately. Specifically, when the temperature of the upper carbonization chamber 33 is higher than 800 ° C., for example, combustion exhaust gas having a low temperature is introduced into the horizontal flue 27 to lower the temperature of the upper carbonization chamber 33. On the other hand, when the temperature of the upper carbonization chamber 33 is lower than, for example, 750 ° C., high-temperature combustion exhaust gas is introduced into the horizontal flue 27 to raise the temperature of the upper carbonization chamber 33. By providing the horizontal flue 27, it becomes possible to control the temperature of the upper carbonization chamber 33 in a state in which the combustion chamber in which the air volume adjustment damper 25 of the auxiliary flame passage is opened can be observed. The reason why the temperature of the combustion exhaust gas introduced into the horizontal flue 27 is set to 300 ° C. or higher is to prevent heat shock from being applied to the furnace body.

  If the combustion exhaust gas from the combustion burner 31 is introduced into the combustion chamber 12, the heat of the combustion exhaust gas from the combustion burner 31 can also be stored in the heat storage chamber, and the heat of the combustion exhaust gas can be used effectively. Furthermore, by providing two rows of horizontal flues 27 in one combustion chamber 12, heat can be evenly transmitted to the carbonization chambers 11 on both sides of the combustion chamber 12. Furthermore, by providing the combustion burners 31 at both ends of the horizontal flue 27, the temperature of the horizontal flue 27 by the combustion exhaust gas can be made substantially uniform in the longitudinal direction.

  Although not shown, a temperature measuring device such as a thermocouple is installed in the upper part 33 of the carbonization chamber, and the air amount and the fuel gas amount supplied to the combustion burner 31 are remotely controlled based on the measured value of the temperature measuring device, The upper temperature may be controlled automatically. In addition to this, the temperature of the upper carbonization chamber 33 may be controlled by remotely controlling the amount of air and the amount of fuel gas charged into the combustion burner 31 in accordance with the charging charcoal properties and the charging amount.

  Hereinafter, the structure of the combustion burner 31 will be described. In the present embodiment, as the combustion burner 31, a tubular flame burner that can perform high-load combustion, has a very large adjustment range of the combustion amount, is miniaturized, and hardly causes environmental pollution is used.

  5 and 6 are views showing an example of the combustion burner. FIG. 5 is a side view with a part cut away, and FIG. 6 is a cross-sectional view taken along the line AA in FIG. Reference numeral 40 denotes a tubular device combustion chamber, one end of which is connected to the horizontal flue 27 and serves as a discharge port for combustion exhaust gas. A slit is formed in the other end portion along the tube axis direction, and a nozzle 41 is provided for blowing a premixed gas composed of a fuel gas and an oxygen-containing gas connected to the slit.

  The nozzle 41 is provided toward the tangential direction of the inner wall surface of the apparatus combustion chamber 40, and a swirling flow is formed in the apparatus combustion chamber 40 by blowing the premixed gas. Further, the nozzle 41 has a flat tip portion and a reduced opening area so that the premixed gas is blown at a high speed. Reference numeral 42 denotes a spark plug.

  5 and 6, a plurality of nozzles 41 are shown. However, when the premixed gas is burned, the number of nozzles 41 is not necessarily plural. There may be only one.

  In the burner configured as described above, when the premixed gas blown from the nozzle 41 and ignited with the swirl flow is ignited, the gas in the apparatus combustion chamber 40 is stratified by the density difference, and the gas having different densities on both sides of the flame 43. You can layer. That is, high-temperature combustion exhaust gas exists on the axis side where the turning speed is low, and unburned gas exists on the inner wall side of the apparatus combustion chamber 40 where the turning speed is high.

  Further, in the vicinity of the inner wall, the turning speed exceeds the flame propagation speed, so that the flame cannot remain in the vicinity of the inner wall. For this reason, a flame is generated in the apparatus combustion chamber 40 in a tubular shape. 43 shows a tubular flame. In addition, since unburned gas exists near the inner wall of the apparatus combustion chamber, the wall surface of the apparatus combustion chamber 40 is not heated to a high temperature by direct heat transfer. The gas in the apparatus combustion chamber 40 flows to the downstream side while swirling. Meanwhile, the gas on the inner wall side sequentially burns, moves to the axial center side, and is discharged from the open end.

  By the way, when the some nozzle 41 is provided like embodiment shown in the said FIG.5 and FIG.6, fuel gas piping or oxygen-containing gas piping is connected to these nozzles, and the nozzle for fuel gas The fuel gas and the oxygen-containing gas can be blown separately. In this way, even if the fuel gas and the oxygen-containing gas are blown separately, each gas is blown at high speed toward the tangential direction of the device combustion chamber 40 and is efficiently mixed in a region near the inner wall in the device combustion chamber 40. Thus, except for a slight increase in the thickness of the flame zone, the flame shape is substantially the same as when the premixed gas burns.

  The burner having the above configuration has the following advantages. Since it burns in the apparatus combustion chamber 40 and the flame 43 does not exist outside the apparatus combustion chamber 40 (outside the burner), it is not necessary to secure a combustion space in front of the burner.

  Furthermore, since there is no flame outside the burner, even if a flow field is formed at the introduction destination of the combustion exhaust gas, it does not affect the flame and it is not necessary to provide a flame holder or the like.

  In addition, although the premixed gas is blown at a high speed, the central portion in the apparatus combustion chamber 40 has a small swirl speed, and the flame is stabilized here, so that stable premixing is possible even when the blow speed is high. A flame is formed, and high-load combustion is possible. And the following advantages are added by forming a stable premixed flame.

  The variation in the temperature of the exhaust gas discharged is small, and the temperature of each part in the introduction destination of the combustion exhaust gas is maintained in a state where there is no variation.

  Oxygen utilization efficiency can be increased, and it is not necessary to supply extra oxygen-containing gas in connection with this, so that high-temperature combustion exhaust gas can be generated. Further, since combustion can be performed even under conditions where the fuel gas component is very lean, the stable combustion range of the burner itself can be expanded and low-temperature combustion exhaust gas can be generated.

Small variations in the temperature of the combustion exhaust gas, since no local high-temperature portion occurs during combustion, the amount of harmful substances such as NO _X is small.

  Since the mixing property of fuel and oxygen is good and a local low temperature region is not formed, the residual amount of unburned hydrocarbons and the like is not very small and soot is hardly generated.

  In addition, when a plurality of nozzles 41 are provided and divided into fuel gas nozzles and oxygen-containing gas nozzles, the gas to be supplied can be preheated to a high temperature region above the ignition point. In addition to being able to increase the temperature, it is possible to effectively perform heat recovery by heat exchange with exhaust gas or the like.

  The present embodiment can be variously modified without changing the gist of the present invention. For example, the horizontal flue of the present invention is applicable to a multi-stage combustion type Karl-Steel type coke oven and an Otto type coke oven that do not have a two-stage auxiliary flame path. Further, the present invention can be applied to a zone-type Carlstil type coke oven and an Otto type coke oven that are not hairpin type.

  Further, the horizontal flue may be opened only in one of PS and CS of the furnace body, and the combustion burner may be provided in only one of PS and CS of the furnace body. Furthermore, in order to guide only the combustion exhaust gas heated by the furnace body to the combustion chamber, the middle part of the horizontal flue may not be connected to all the combustion chambers, but may be connected only to the center combustion chamber in the furnace length direction. .

Sectional drawing along the furnace length direction of the furnace body of the coke oven in one Embodiment of this invention. Sectional drawing of the furnace body orthogonal to the furnace length direction. Schematic showing two-stage combustion and exhaust gas circulation in the combustion chamber. The perspective view which shows the air volume adjustment damper in an auxiliary flame path ((A) in a figure shows the state which opened the damper, (B) shows the state which closed the damper in the figure). The side view which shows a combustion burner. AA line sectional view of Drawing 5. Sectional drawing which shows the conventional Coppers type coke oven.

Explanation of symbols

11 ... Carbonization chamber 12 ... Combustion chamber 27 ... Horizontal flue 31 ... Combustion device (combustion burner)
32 ... Branch 33 ... Carbonization chamber upper part 40 ... Device combustion chamber 41 ... Nozzle

Claims (6)

There is a heat storage chamber at the bottom of the furnace body, and combustion chambers and carbonization chambers are alternately arranged at the top, and the coke that has been carbonized in the carbonization chamber is changed from PS (pusher side) to CS (coke side) of the furnace body. In the coke oven that pushes out
A horizontal flue that extends in the furnace length direction (direction in which coke is pushed from PS of the furnace body toward CS) and opens to the PS and / or CS of the furnace body is provided above or above the combustion chamber,
A coke oven, wherein a combustion device for introducing combustion exhaust gas into the horizontal flue is provided at an end of the horizontal flue.   The coke oven according to claim 1, wherein the horizontal flue and the combustion chamber are connected by a branch road.   The coke oven according to claim 1 or 2, wherein two rows of the horizontal flues are provided between the carbonization chambers on both sides of the combustion chamber with respect to one combustion chamber. The combustion device comprises:
A tubular combustion chamber having one end connected to the horizontal flue and a slit formed along the tube axis direction at the other end;
A nozzle that blows a premixed gas composed of a fuel gas and an oxygen-containing gas having a flat tip shape and a reduced opening area; and
The coke oven according to any one of claims 1 to 3, wherein a nozzle for injecting a premixed gas is provided in a direction tangential to an inner wall surface of the apparatus combustion chamber connected to the slit. The combustion device comprises:
A tubular combustion chamber having one end connected to the horizontal flue and a slit formed along the tube axis direction at the other end;
A nozzle for blowing a fuel gas and a nozzle for blowing an oxygen-containing gas having a flat tip shape and a reduced opening area;
The coke oven according to any one of claims 1 to 3, wherein these gas blowing nozzles are connected to the slit and are provided in a tangential direction of an inner wall surface of the apparatus combustion chamber. Using the coke oven according to claim 1,
A temperature control method for an upper part of a coke oven carbonization chamber, wherein the temperature of the upper part of the carbonization chamber is controlled by introducing combustion exhaust gas from the combustion device into the horizontal flue.

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