JP2017160315A - Furnace body drying method when firing in furnace body installation of coke oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a furnace body drying method when firing in a furnace body installation of a coke oven capable of suppressing a temperature deviation in a depth direction of a coke oven chamber from occurring even when heating and drying are performed by installing a temporary burner in the coke oven chamber, and capable of shortening a drying period by properly adjusting a temperature increase rate.SOLUTION: A furnace body drying method when firing in a furnace body installation of a coke oven having a structure in which a combustion chamber and a coke oven chamber 10 are alternately arranged above a regenerator includes a step of installing a temporary burner 40 in the coke oven chamber 10, a step of installing a radiation wall 50 surrounding a combustion flame of the temporary burner 40 on an apex side of the temporary burner 40, a step of heating and drying a furnace wall of the coke oven chamber 10 by radiation heat from the radiation wall 50, and a step of dying the furnace body installation by introducing a combustion exhaust gas of the temporary burner 40 to the furnace body entirety including the combustion chamber and the regenerator.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for drying a furnace body at the time of firing in a furnace body facility of a coke oven having a structure in which combustion chambers and carbonization chambers are alternately arranged above a heat storage chamber.

  Conventionally, as a coke oven for producing coke by high-temperature carbonization of coal charged in a carbonization chamber, a structure in which a plurality of carbonization chambers and combustion chambers are alternately arranged above the heat storage chamber is provided Has been. In this coke oven, fuel gas and air are supplied from the heat storage chamber to the combustion chamber for combustion, and coal is charged into a carbonization chamber adjacent to the combustion chamber, and the coal is dry distilled at a high temperature. Make coke.

  The furnace body equipment of the above-mentioned coke oven is constructed by refractory brickwork, and the furnace body after the construction is in a state of being moistened by moisture contained in the refractory brick itself or joint mortar. For this reason, it is necessary to dry the furnace body sufficiently before the start of the actual operation. For example, Patent Document 1 proposes a method of determining the degree of dryness of a furnace body after the coke oven is built, and it is required to check the dryness of the furnace body before firing.

  In addition, the furnace body drying after the furnace building is also carried out in a furnace other than the coke oven. In particular, the furnace body of the coke oven is divided into a heat storage chamber, a combustion chamber and a carbonization chamber and a plurality of furnace chambers. Because of its structure, in general, fuel such as COG and light oil is burned in the carbonization chamber, and the combustion exhaust gas is guided to the entire furnace body such as the combustion chamber, bellows, heat storage chamber, horizontal flue, etc. In addition, the furnace body is dried by exhausting combustion gas from the flue and chimney to the atmosphere. In addition, as a furnace body drying technique at the time of burning in the furnace body equipment of a coke oven, it is disclosed by patent document 2, for example.

  Here, as a furnace material of a coke oven, for example, as shown in Patent Document 3, silica brick is generally used, and cracking may occur due to a volume change accompanying a phase transition at the time of drying / heating after the furnace building. There is. In order to avoid this, it is necessary to slow the temperature rising rate, particularly in the temperature range of 250 ° C. or less at the initial stage of drying, extremely slowing the temperature rising rate, and then gradually increasing the temperature rising rate while increasing the brick temperature. The temperature is raised to 800 ° C.

Japanese Patent Laid-Open No. 01-273990 JP 2009-249437 A JP 2006-124561 A

  By the way, when a temporary burner is disposed in the carbonization chamber and the furnace body is dried by the combustion exhaust gas, the temporary burner is installed in the vicinity of the inlet of the carbonization chamber, and the combustion frame extends in the depth direction of the carbonization chamber. Therefore, a temperature deviation of the combustion flame occurs in the depth direction of the carbonization chamber. Therefore, in order to suppress the occurrence of cracks in the quartz brick constituting the furnace wall of the carbonization chamber, it is necessary to increase the temperature by monitoring the temperature of the furnace wall position of the carbonization chamber that is the highest temperature by the combustion flame. For this reason, the temperature increase rate of the furnace body by the temporary burner needs to be further slowed down, resulting in a problem that the drying period becomes very long.

  The present invention has been made in view of the above-described situation. Even when a temporary burner is installed in the carbonization chamber and heat-dried, the occurrence of temperature deviation in the depth direction of the carbonization chamber is suppressed, and the temperature rises. An object of the present invention is to provide a method for drying a furnace body at the time of firing in a furnace body facility of a coke oven that can shorten the drying period by appropriately adjusting the temperature rate.

  In order to solve the above problems, a furnace body drying method at the time of firing in a furnace body equipment of a coke oven according to the present invention is a coke oven having a structure in which combustion chambers and carbonization chambers are alternately arranged at an upper portion of a heat storage chamber. A furnace body drying method at the time of firing in the furnace body equipment, wherein a temporary burner is installed in the carbonization chamber, and a radiation wall surrounding a combustion frame of the temporary burner is provided on a tip side of the temporary burner, and the radiation The furnace wall of the carbonization chamber is heated and dried by radiant heat from the wall, and the combustion exhaust gas of the temporary burner is guided to the entire furnace body including the combustion chamber and the heat storage chamber to dry the furnace body equipment. It is a feature.

  According to the furnace body drying method at the time of firing in the furnace body equipment of the coke oven of this configuration, a temporary burner is installed in the carbonization chamber, and the radiation wall surrounding the combustion frame of the temporary burner at the front end side of the temporary burner Therefore, it is possible to suppress heating the furnace wall of the carbonization chamber directly by the combustion frame and to heat and dry the furnace wall of the carbonization chamber by radiant heat from the radiation wall. Can be suppressed. Therefore, the temperature rising rate can be managed according to the appropriate temperature of the entire carbonization chamber, and the drying period of the furnace body drying at the time of burning can be shortened. Moreover, since there is no locally high temperature portion, the occurrence of cracks in the refractory bricks constituting the furnace wall of the carbonization chamber can be suppressed.

  Here, in the furnace body drying method at the time of firing in the furnace body equipment of the coke oven of the present invention, the radiant wall has a width such that a gap between the carbonization chamber and the furnace wall is 0.05 m or more and 0.1 m or less. A height in the direction from 0.4 m to 0.8 m and a depth length from 1.5 m to 2.5 m from the installation height of the temporary burner, It is preferable that the tip position of the temporary burner is disposed within a range of −0.15 m to 0.05 m with respect to the temporary burner side end face of the radiation wall.

  In this case, since the size of the radiant wall is defined as described above, the combustion frame of the temporary burner can be properly surrounded by the radiant wall, and the furnace wall of the carbonization chamber is not directly heated by the combustion frame. The occurrence of temperature deviation in the depth direction of the carbonization chamber can be further suppressed. For this reason, the inside of a carbonization chamber can be heated uniformly, it can carry out according to the appropriate temperature of the whole carbonization chamber, and it can aim at shortening of the drying period of the furnace body at the time of burning.

  Further, in the furnace body drying method at the time of firing in the furnace body equipment of the coke oven of the present invention, the radiant wall has a gate-type structure having a side wall part and a ceiling part extending in the depth direction of the carbonization chamber, The side wall portion and the ceiling portion are provided with a plurality of openings, the opening ratio in the side wall portion is 10% or more and 15% or less, and the opening ratio in the ceiling portion is 25% or more and 30% or less. It is preferable that

In this case, since the radiation wall has a portal structure having a side wall portion and a ceiling portion extending in the depth direction of the carbonization chamber, that is, along the combustion frame from the temporary burner, the combustion of the temporary burner is performed. It becomes easy to exhaust the exhaust gas from the radiation wall to the outside.
Moreover, the said side wall part and the said ceiling part are provided with the several opening part, The opening rate in the said side wall part is 10% or more and 15% or less, and the opening ratio in the said ceiling part is 25% or more and 30% or less. Therefore, it is possible to efficiently transfer the heat of the combustion frame to the furnace wall of the carbonization chamber while suppressing the occurrence of temperature deviation in the depth direction of the carbonization chamber.

  As described above, according to the present invention, even when a temporary burner is installed in the carbonization chamber and heat-dried, the occurrence of temperature deviation in the depth direction of the carbonization chamber is suppressed, and the temperature increase rate is adjusted appropriately. By performing the above, it is possible to provide a furnace body drying method at the time of firing in the furnace body equipment of a coke oven that can shorten the drying period.

It is a schematic explanatory drawing of the coke oven to which the furnace body drying method at the time of burning in the furnace body equipment of the coke oven which is one embodiment of the present invention is applied. It is a cross-sectional explanatory drawing of the coke oven shown in FIG. It is sectional explanatory drawing of the carbonization chamber at the time of a furnace body drying. It is side surface explanatory drawing of a radiation wall. It is front explanatory drawing of a radiation wall. It is a graph which shows the result of an Example.

  Hereinafter, a method for drying a furnace body at the time of firing in the furnace body equipment of a coke oven according to an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, this invention is not limited to the following embodiment.

First, the coke oven 1 to which the furnace body drying method at the time of firing in the furnace body equipment of the coke oven 1 according to this embodiment is applied will be described.
As shown in FIG. 1, the coke oven 1 according to the present embodiment includes a plurality of carbonization chambers 10 arranged in parallel, and a combustion chamber 20 is disposed between two adjacent carbonization chambers 10.
And as shown in FIG. 2, the thermal storage chamber 30 is arrange | positioned in the downward side of the carbonization chamber 10 and the combustion chamber 20 in parallel.

As shown in FIGS. 1 and 2, a plurality of inlets 12 for charging coal are formed on the upper surface of the carbonization chamber 10, and the carbonization chamber 10 has an end portion generated from the carbonization chamber 10. An ascending pipe 14 for discharging exhaust gas is arranged, and the ascending pipe 14 is connected to the dry men 3.
Further, the carbonization chamber 10 is a pair of furnaces of the carbonization chamber 10 as shown in FIG. 5 in order to efficiently transfer heat from the combustion chamber 20 provided between the parallel carbonization chambers 10 to the coal. The distance between the walls 11 and 11 (furnace wall located on the combustion chamber 20 side) is relatively short. That is, the furnace width of the carbonization chamber 10 is narrowed.

As shown in FIGS. 1 and 2, an inspection hole 21 and a thermometer 22 for inspecting the inside of the combustion chamber 20 are disposed on the upper surface of the combustion chamber 20. Further, as shown in FIG. 2, a partition wall 24 is disposed in the combustion chamber 20.
The heat storage chamber 30 is configured to introduce the combustion gas and air into the combustion chamber 20 and to discharge the exhaust gas in the combustion chamber 20, and as shown in FIG. 5 and the flue 7 are connected.

Here, the furnace body equipment of the coke oven 1 including the carbonization chamber 10, the combustion chamber 20, and the heat storage chamber 30 is configured by stacking silica bricks, and when the furnace is built, the silica bricks and joint mortar contain moisture. Therefore, it is necessary to dry the furnace body equipment before starting the actual operation.
As shown in FIG. 3, drying of the furnace body equipment of the coke oven 1 is performed by inserting a temporary burner 40 from the furnace lid 15 of the carbonization chamber 10, and the combustion exhaust gas of the temporary burner 40 from the carbonization chamber 10 to the combustion chamber 20 and the heat storage. It is implemented by introducing it into the entire furnace equipment including the chamber 30.

And in the furnace body drying method at the time of the ignition in the furnace body equipment of the coke oven 1 which is this embodiment, as shown in FIG. 3, the tip side of the temporary burner 40 inserted from the furnace cover 15 of the carbonization chamber 10 is provided. A radiation wall 50 surrounding the combustion frame of the temporary burner 40 is provided.
As shown in FIG. 4, the radiant wall 50 is configured by stacking refractory bricks 51. In the present embodiment, chamotte bricks are used. Moreover, since this radiation wall 50 is demolished after drying, in order to ensure workability at the time of demolishing, the radiant wall 50 is not bonded using mortar or the like, but has a structure in which fire bricks 51 are simply stacked.

As shown in FIGS. 4 and 5, the radiant wall 50 has a gate shape having a side wall portion 54 and a ceiling portion 55 extending in the depth direction of the carbonization chamber 10, that is, along the combustion frame from the temporary burner 40. It has a structure and opens toward the depth direction of the carbonization chamber 10.
Here, as shown in FIGS. 4 and 5, the radiation wall 50 has a width direction length W in which the gap S between the carbonization chamber 10 and the furnace wall 11 is 0.05 m or more and 0.1 m or less, and a temporary burner 40. A height direction length H that is 0.4 m or more and 0.8 m or less and a depth length L that is 1.5 m or more and 2.5 m or less.
Further, the tip position of the temporary burner 40 is set at a distance D from the end face of the radiation wall 50 on the temporary burner 40 side, and in the present embodiment, the distance D is set within a range of −0.15 m to 0.05 m. Has been. The distance D when the tip of the temporary burner 40 is located inside the radiant wall 50 is indicated by a minus sign, -0.15 m indicates that the tip of the temporary burner 40 enters 0.15 m inside the radiant wall 50. It becomes the position.

The side wall 54 and the ceiling 55 of the radiant wall 50 are provided with a plurality of openings 57. The side wall 54 has an opening ratio of 10% to 15%, and the ceiling 55 has an opening ratio of 25%. Above 30%.
In the present embodiment, as shown in FIGS. 4 and 5, the above-described opening 57 is formed by forming a gap when the refractory bricks 51 are stacked.

And when drying the furnace body equipment of the coke oven 1, fuel such as COG or light oil is burned using the temporary burner 40, and the combustion frame of the temporary burner 40 is surrounded by the radiation wall 50, so that the carbonization chamber The ten furnace walls 11 are heated by radiant heat from the radiant wall 50. Further, the combustion exhaust gas of the temporary burner 40 is discharged from the radiation wall 50 to the carbonization chamber 10 and introduced into the entire furnace equipment including the combustion chamber 20 and the heat storage chamber 30.
At this time, the temperature control at the time of drying is to monitor the temperature of the hottest region of the furnace wall of the carbonization chamber 10 in order to suppress the occurrence of cracks due to the volume change accompanying the phase transition of the silica brick. become.

According to the furnace body drying method at the time of firing in the furnace body equipment of the coke oven 1 according to the present embodiment configured as described above, the temporary burner 40 is inserted into the carbonization chamber 10 from the furnace lid 15, and this temporary burner Since the radiation wall 50 surrounding the combustion frame of the temporary burner 40 is provided on the front end side of the 40, the carbonization chamber 10 is not directly heated by the combustion frame 10 but by the radiant heat from the radiation wall 50. Therefore, the occurrence of temperature deviation in the depth direction of the carbonization chamber 10 during drying can be suppressed.
Therefore, the temperature rise rate can be managed according to the appropriate temperature of the entire carbonization chamber 10, and the drying period of the furnace body drying at the time of firing can be shortened. Moreover, generation | occurrence | production of the crack of the refractory brick of the furnace wall 11 of the carbonization chamber 10 can be suppressed.

  In the present embodiment, the radiation wall 50 has a width direction length W in which the gap S between the carbonization chamber 10 and the furnace wall 11 is 0.05 m or more and 0.1 m or less, and the installation height h of the temporary burner 40. A height length H of 0.4 m to 0.8 m and a depth length L of 1.5 m to 2.5 m, and the tip position of the temporary burner 40 is radiated Since the wall 50 is disposed within the range of −0.15 m to 0.05 m with respect to the temporary burner side end surface, the combustion frame of the temporary burner 40 can be appropriately surrounded by the radiation wall 50, and the carbonization chamber 10. The occurrence of temperature deviation in the depth direction can be further suppressed.

Further, in the present embodiment, the radiation wall 50 has a portal structure having a side wall portion 54 and a ceiling portion 55 extending along the depth direction of the carbonization chamber 10, that is, along the combustion frame from the temporary burner 40. Therefore, the combustion exhaust gas of the temporary burner 40 can be efficiently discharged from the radiation wall 50 to the carbonization chamber 10, and the entire furnace body structure can be dried by this combustion exhaust gas.
Moreover, the opening part 57 in the side wall part 54 and the ceiling part 55 is provided with the opening rate in the side wall part 54 being 10% or more and 15% or less, and the opening ratio in the ceiling part 55 is 25% or more and 30% or less. Therefore, it is possible to efficiently transfer the heat of the combustion frame to the furnace wall 11 of the carbonization chamber 10 while suppressing the occurrence of temperature deviation in the depth direction of the carbonization chamber 10.

As mentioned above, although the furnace drying method at the time of burning in the furnace equipment of the coke oven which is an embodiment of the present invention was explained, the present invention is not limited to this, and the range which does not deviate from the technical idea of the invention It can be changed as appropriate.
For example, in the present embodiment, the radiant wall is described as being made of chamotte bricks, but is not limited to this, as long as the radiant wall is made of a material that is resistant to the combustion frame of the temporary burner. .
Further, in the present embodiment, the radiation wall is described as having a structure in which chamotte bricks are simply stacked without bonding using mortar or the like, but refractory bricks may be bonded using mortar.

The result of the comparative experiment conducted in order to confirm the effect of this invention is demonstrated.
As a conventional example, the furnace body was dried using a temporary burner without providing a radiation wall. As an example of the present invention, the radiant wall described in the embodiment was disposed on the tip side of the temporary burner, and the furnace body was dried. And the transition of the management temperature at this time is shown in FIG.

As shown in FIG. 6, in the present invention example using the radiation wall, the number of days of the drying period was reduced compared to the conventional example not using the radiation wall.
From the above, according to the example of the present invention, even when heating with a temporary burner, the occurrence of temperature deviation in the depth direction of the carbonization chamber is suppressed, and the temperature rise rate is adjusted appropriately, thereby drying. It was confirmed that the period could be shortened.

1 Coke Oven 10 Carbonization Chamber 11 Furnace Wall 15 Furnace 20 Combustion Chamber
40 Temporary burner 50 Radiant wall 51 Refractory brick 54 Side wall 55 Ceiling 57 Opening

Claims (3)

A furnace body drying method at the time of firing in a furnace body facility of a coke oven having a structure in which combustion chambers and carbonization chambers are alternately arranged at an upper part of a heat storage chamber,
A temporary burner is installed in the carbonization chamber, and a radiant wall surrounding a combustion frame of the temporary burner is provided on the tip side of the temporary burner,
The furnace wall of the carbonization chamber is heated and dried by radiant heat from the radiation wall, and the flue gas of the temporary burner is guided to the entire furnace body including the combustion chamber and the heat storage chamber, thereby drying the furnace body equipment. A furnace body drying method at the time of firing in a furnace body equipment of a coke oven characterized by: The radiation wall has a length in the width direction in which a gap between the carbonization chamber and the furnace wall is 0.05 m or more and 0.1 m or less, and 0.4 m or more and 0.8 m or less upward from the installation height of the temporary burner. A height direction length of 1.5 m and a depth length of 1.5 m to 2.5 m,
2. The coke oven according to claim 1, wherein a tip position of the temporary burner is disposed within a range of −0.15 m to 0.05 m with respect to the temporary burner side end surface of the radiation wall. Furnace drying method at the time of firing in the furnace body equipment. The radiant wall has a gate structure having a side wall and a ceiling extending in the depth direction of the carbonization chamber, and the side wall and the ceiling are provided with a plurality of openings.
3. The coke oven furnace according to claim 1, wherein an opening ratio in the side wall portion is 10% to 15% and an opening ratio in the ceiling portion is 25% to 30%. Furnace drying method at the time of burning in body equipment.

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