JP6372531B2 - Method for constructing hot stove and hot stove - Google Patents

Description

  The present invention relates to a hot stove construction method and a hot stove used in, for example, the steel industry, and is suitable for a hot stove that creates hot air to be blown into a blast furnace, for example.

  As a method for constructing such a hot stove, there is one described in Patent Document 1 below, for example. This hot stove construction method is based on brickwork after connecting the hot stove body and the hot air branch vertical part horizontally by operating the jack of the hot air branch pipe according to the thermal expansion during combustion in the hot stove body. It is intended to offset the subduction of the hot air branch vertical part and the thermal expansion of the iron skin.

JP 2011-68971 A

  However, the construction method of the hot stove described in Patent Document 1 is a so-called top-burning hot stove in which a combustion chamber is incorporated at the top of the heat storage chamber, and the heat storage chamber, the combustion chamber, and the blast mixer are separated. It is difficult to apply to a so-called external combustion type (Coppers type) hot stove. For example, the jack at the vertical portion of the hot air branch pipe in Patent Document 1 is arranged in the blast mixer in the external combustion type hot air furnace, but the level difference between the combustion chamber and the blast mixer and the blast mixer and the lower portion are only adjusted by the jack of the blast mixer. It is difficult to suppress the level difference of the hot air branch pipe within an allowable value of 5 mm, which is the limit of joint breakage of bricks.

  The present invention has been made paying attention to the above-mentioned problems, and even in an external combustion type hot air furnace in which the heat storage chamber, the combustion chamber, and the blast mixer are separate, the level difference between each part is allowed as the allowable value for the joint breakage of bricks. It is an object of the present invention to provide a hot stove construction method and a hot stove that can be suppressed within the range.

  In order to solve the above-described problem, according to one aspect of the present invention, the heat storage chamber, the combustion chamber, and the blast mixer are separate, and the upper end of the heat storage chamber and the upper end of the combustion chamber are not used in the connection portion. A connecting pipe, a middle part of the combustion chamber and the upper end of the blast mixer are connected by an outlet pipe, and a lower end part of the blast mixer is connected to a hot air valve via a lower hot air branch pipe. The amount of deflection δ1 of the combustion chamber frame due to brick stacking inside the combustion chamber, the relative difference δ2 in thermal expansion between the combustion chamber and the blast mixer when the brick is heated, and the extension of the lower hot air branch pipe when the brick is heated There is provided a method for constructing a hot stove that adjusts dimensions at the time of initial installation of the respective iron shells of the heat storage chamber, the combustion chamber, and the blast mixer in accordance with the amount δ3.

  Further, according to another aspect of the present invention, the heat storage chamber, the combustion chamber, and the blast mixer are separate, and the upper end portion of the heat storage chamber and the upper end portion of the combustion chamber are connected to each other without using an expansion joint. A hot stove connected by a connecting pipe, an intermediate part of the combustion chamber and an upper end part of the blast mixer connected by an outlet pipe, and a lower end part of the blast mixer connected to a hot air valve via a lower hot air branch pipe; , A deflection amount δ1 of the combustion chamber frame due to brick stacking in the combustion chamber, a relative difference δ2 in thermal expansion between the combustion chamber and the blast mixer at the time of raising the brick drying temperature, and the lower hot air branch pipe at the time of raising the brick drying temperature There is provided a hot stove provided with dimension adjusting means for adjusting dimensions at the time of initial installation of each iron skin of the heat storage chamber, the combustion chamber, and the blast mixer in accordance with the elongation amount δ3.

  Thus, in the hot stove construction method and hot stove of the present invention, the level difference of each part can be suppressed to within the allowable limit of joint breakage of bricks even in the external combustion type hot stove.

It is a schematic block diagram of the external combustion type hot stove which shows one Embodiment of the construction method of the hot stove of this invention. FIG. 3 is an explanatory diagram of a deflection amount δ1, a thermal expansion relative difference δ2, and an elongation amount δ3 in the external combustion type hot stove of FIG.

The following embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, structure, arrangement, etc. of components. Is not specified as follows. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.
Below, one Embodiment of the construction method of the hot stove of this invention is described, referring drawings. FIG. 1 is a schematic configuration diagram of an external combustion type (Coppers type) hot stove to which the construction method of the hot stove of this embodiment is applied. The external combustion type hot stove of this embodiment is equipment for blowing hot air to a blast furnace of an ironworks, and includes a heat storage chamber 1, a combustion chamber 2, and a blast mixer 3 as separate bodies. The combustion chamber 2 literally burns fuel gas inside to raise the temperature in the furnace. The heat storage chamber 1 is for storing sensible heat in the furnace heated in the combustion chamber 2, and the hot air blown from the heat storage chamber 1 is adjusted to an appropriate temperature by the blast mixer 3 to be used in the blast furnace. Supplied. The blast mixer 3 is provided with a jack 4 for adjusting the level (height) of the blast mixer 3 itself.

  In this external combustion type hot stove, the heat storage chamber 1 is erected on the ground. On the other hand, the combustion chamber 2 and the blast mixer 3 are provided on the frame 5. And the upper end part of the heat storage chamber 1 and the upper end part of the combustion chamber 2 are connected by the connecting pipe 6, the intermediate part of the combustion chamber 2 and the upper end part of the blast mixer 3 are connected by the outlet pipe 7, and the lower hot air branch pipe 8 is connected. The lower end of the blast mixer 3 is connected to the hot air valve 9 via The hot air valve 9 is connected to the lower hot air branch pipe 8 using a short pipe (not shown) orthogonal to the lower hot air branch pipe 8, and the outlet side of the hot air valve 9 is connected to the hot air main pipe 10. Moreover, the hot air valve side end portion of the lower hot air branch pipe 8 is supported via a slide saddle 11 that allows the lower hot air branch pipe 8 to slide in the axial direction. The outer surface of this hot stove is covered with iron skin, but bricks are stacked inside to protect the iron skin and store sensible heat. As described in Patent Document 1 described above, the expansion joint is very complicated and difficult to be stacked, and the brick is easily worn and dropped, and the iron skin is red-hot and worn. Therefore, in the external combustion type hot stove of this embodiment, the expansion joint is not used for the connecting portion.

And this external combustion type hot stove has an amount of deflection δ1 of the frame 5 due to brick stacking inside the combustion chamber 2, a relative difference δ2 in thermal expansion between the combustion chamber 2 and the blast mixer 3 when the brick drying temperature rises, and a brick drying rise. A dimension adjusting means 20 is provided for adjusting the dimensions of the iron shells of the heat storage chamber 1, the combustion chamber 2, and the blast mixer 3 during the initial installation according to the amount of elongation δ 3 of the lower hot air branch pipe 8 at the time of warming.
The dimension adjusting means 20 includes a dimension adjusting unit 21 that installs the combustion chamber 2 higher than the heat storage chamber 1 by a deflection amount δ1 during the initial installation of the iron skin, and a deflection amount δ1 and heat during the initial installation of the iron skin. The amount of deflection δ1 laid under the slide saddle 11 that supports the hot air valve side end of the lower hot air branch pipe 8 that lifts the hot air valve connecting position of the lower hot air branch pipe 8 with respect to the combustion chamber 2 by the difference from the relative expansion difference δ2. And a liner (not shown) having a difference between the relative difference of thermal expansion δ2 and the hot air valve connecting position of the lower hot air branch pipe 8 with respect to the hot air valve 9 at the time of blast mixer 3 side when the iron skin is initially installed And a slide saddle 11 that supports the hot air valve side end portion of the lower hot air branch pipe 8 in a state in which the allowance for the extension amount δ3 of the lower hot air branch pipe 8 is allowed when the temperature of the brick is dry.

  When constructing this external combustion type hot stove, first, the iron skin of the combustion chamber 2 is installed on the frame 5 according to the specified dimensions. After that, the iron skin of the heat storage chamber 1 is installed. At that time, the dimension adjusting unit 21 of the dimension adjusting means 20 is configured as a combustion chamber frame by brick stacking in the combustion chamber 2 as shown in FIG. 5 and the dimensional adjustment at the final joint position of the heat storage chamber 1 so that the iron shell of the combustion chamber 2 is higher than the heat storage chamber 1 by the amount of deflection δ1. Do. Here, in the calculation of the deflection amount δ1 of the combustion chamber frame (beam) 5 due to brick stacking, the deflection of the beam due to the brick weight applied to the combustion chamber seat is calculated. The calculation of the deflection amount δ1 is specifically performed as follows. Since the combustion chamber 2 is installed on the combustion chamber frame 5, a vertical load corresponding to the weight of the brick acts on the combustion chamber frame 5. The deflection is calculated from the load on each of the planar beam, the fired material, and the column, and δ1 is obtained.

  When the bricks in the combustion chamber 2 are finished, the combustion chamber frame 5 sinks by the amount of deflection δ1, so that the connecting pipe 6 connecting the heat storage chamber 1 and the combustion chamber 2 is in a horizontal state. Subsequently, when installing the iron skin of the blast mixer 3, when the combustion chamber 2 and the blast mixer 3 are connected by the outlet pipe 7, the lower hot air branch pipe connection position of the blast mixer 3 is the original (final) hot air valve. The relative difference δ2 of thermal expansion between the combustion chamber 2 and the blast mixer 3 at the time of raising the temperature of the brick drying shown in FIG. The dimension adjustment is performed at the field welding portion of the blast mixer 3 so as to increase by the difference of the deflection amount δ1 (however, it is not connected to the hot air valve at this time). At that time, the hot air valve connecting position of the lower hot air branch pipe 8 with respect to the combustion chamber 2 is raised by the difference between the deflection amount δ1 and the thermal expansion relative difference δ2 so that the lower hot air branch pipe 8 connected to the blast mixer 3 is horizontal. In the state, the lower hot air branch pipe 8 is connected to the blast mixer 3. This is achieved by laying a liner (shim) having a thickness corresponding to the difference between the deflection amount δ1 and the thermal expansion relative difference δ2 below the slide saddle 11 that supports the hot air valve side end of the lower hot air branch pipe 8. Further, in view of the elongation amount δ3 (hereinafter also simply referred to as the elongation amount δ3) of the lower hot air branch pipe 8 shown in FIG. The hot air valve 9 and the lower hot air branch pipe 8 (strictly, the short pipe described above) are connected in a state where the elongation amount δ3 is close to the blast mixer 3 side. However, in this case, the extension allowance of the extension amount δ3 of the lower hot air branch pipe 8 must be allowed at the time of raising the brick drying temperature. Therefore, a clearance of an extension amount δ3 is provided in the stopper of the slide saddle 11 that supports the hot air valve side end of the lower hot air branch pipe 8.

  Since the bricks are stacked in order from the bottom in each chamber, the bricks in the blast mixer 3 are advanced, and when the bricks in the combustion chamber 2 are completed to the level of the outlet pipe 7, Brick stacking in the outlet pipe 7 is possible. Further, as the brick stacking in the combustion chamber 2 progresses, the combustion chamber frame 5 is bent by the deflection amount δ1 due to the weight of the brick, and each chamber becomes horizontal when the brick stacking in the combustion chamber 2 and the heat storage chamber 1 is completed. It becomes a state and the brick pile in the connecting pipe 6 in a horizontal state is attained. At this time, the level adjustment is performed by the jack 4 of the blast mixer 3 so that the outlet pipe 7 maintains a horizontal body even if the combustion chamber frame 5 is bent by the brick weight.

  When the temperature rise for drying the brick starts, the iron skin is thermally expanded by the heat in the furnace. At that time, at the level of the outlet pipe 7, a part of the relative difference between the thermal expansion of the combustion chamber 2 and the thermal expansion of the blast mixer 3 is adjusted by the jack 4 of the blast mixer 3 to make the outlet pipe 7 horizontal. Further, at the level of the lower hot air branch pipe 8, the lower hot air branch pipe 8 can be kept in a horizontal state by adjusting the liner interposed under the slide saddle 11. At this time, by adjusting the level of the outlet pipe 7 with the jack 4 of the blast mixer 3 so that the outlet pipe 7 is in a horizontal state, the level difference generated at the level of the lower hot air branch pipe 8 is less than the relative difference δ2 of thermal expansion. Accordingly, it is possible to maintain the lower hot air branch pipe 8 in a horizontal state by adjusting the liner interposed under the slide saddle 11. Further, regarding the extension of the lower hot air branch pipe 8, the clearance provided between the slide saddle 11 and the stopper allows the lower hot air branch pipe 8 to extend.

  At the end of the temperature rise for drying the brick, the thermal expansion of each chamber further proceeds, and the outlet pipe 7 and the lower hot air branch pipe 8 can be kept horizontal by adjusting the jack of the blast mixer 3 and the liner of the lower hot air branch pipe 8. Then, at the stage of shifting to the subsequent operation state, the connecting positions of the lower hot air branch pipe 8 and the hot air valve 9 are also in a state where the axial centers coincide with each other. That is, when the iron skin is installed, for example, the combustion chamber 2 and the blast mixer 3 are connected by the outlet pipe 7 in a state where the hot air valve connection position of the lower hot air branch pipe 8 with respect to the combustion chamber 2 is lifted by the liner by the relative difference δ2 of thermal expansion. At the location, the liner may be adjusted so as to cancel the lifting of the relative difference δ2 of thermal expansion at the hot air valve connecting position of the lower hot air branch pipe 8 at the stage of shifting to the operation state after the brick drying temperature rise. And by adjusting the size of the iron skin installation and the level adjustment at the time of raising the brick drying temperature, it was possible to always keep the level difference of each part within the allowable limit of the joint breakage of bricks within 5 mm.

  As described above, in the hot stove construction method and hot stove of this embodiment, the heat storage chamber 1, the combustion chamber 2, and the blast mixer 3 are separate, and the upper end of the heat storage chamber 1 is used without using an expansion joint at the connecting portion. And the upper end of the combustion chamber 2 are connected by a connecting pipe 6, the intermediate part of the combustion chamber 2 and the upper end of the blast mixer 3 are connected by an outlet pipe 7, and the lower end of the blast mixer 3 is connected via a lower hot air branch pipe 8. When the section is connected to the hot air valve 9, the amount of deflection δ 1 of the combustion chamber frame 5 due to brick stacking inside the combustion chamber 2 and the relative difference δ 2 in thermal expansion between the combustion chamber 2 and the blast mixer 3 when the brick drying temperature rises, and The dimensions of the heat storage chamber 1, the combustion chamber 2, and the blast mixer 3 at the time of initial installation are adjusted according to the amount of elongation δ3 of the lower hot air branch pipe 8 when the brick is heated. Thereby, even if it is an external combustion type hot stove in which the heat storage chamber 1 and the combustion chamber 2 are separate, the level difference of each part can be suppressed within the allowable limit of joint breakage of bricks.

Further, at the time of initial installation of the iron skin, after the combustion chamber 2 is installed higher than the heat storage chamber 1 by a deflection amount δ1 minutes, the combustion chamber frame 5 is submerged by the deflection amount δ1 by brick stacking in the combustion chamber 2, and the connecting pipe The heat storage chamber 1 and the combustion chamber 2 are connected in a state where 6 is horizontal. Thereby, the brick pile in the connecting pipe 6 in a horizontal state is possible.
Further, at the time of initial installation of the iron skin, the outlet pipe 7 is horizontal in a state where the hot air valve connecting position of the lower hot air branch pipe 8 with respect to the combustion chamber 2 is raised by the difference between the deflection amount δ1 and the relative difference δ2 of thermal expansion. In this state, the combustion chamber 2 and the blast mixer 3 are connected, and the lifted state of the lower hot air branch pipe 8 at the hot air valve connecting position is released when the temperature of the brick drying is increased. As a result, the bricks in the outlet pipe 7 can be stacked in a horizontal state, and the level difference in the lower hot air branch pipe 8 can be suppressed within the allowable limit of brick joint breakage.

Further, at the time of initial installation of the iron skin, when the hot air valve connecting position of the lower hot air branch pipe 8 with respect to the hot air valve 9 is brought closer to the blast mixer 3 side by the extension amount δ3, and when the brick drying temperature rises, the extension amount δ3 of the lower hot air branch pipe 8 The hot air valve 9 and the lower hot air branch pipe 8 are connected in a state in which the allowance for the expansion is allowed. Thereby, the level difference in the connection position of the lower hot-air branch pipe 8 and the hot-air valve 9 can be suppressed within the allowable limit of joint breakage of bricks.
It goes without saying that the present invention includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention-specific matters described in the appropriate claims from the above description.

DESCRIPTION OF SYMBOLS 1 Heat storage chamber 2 Combustion chamber 3 Blast mixer 4 Jack 5 Frame 6 Connection pipe 7 Outlet pipe 8 Lower hot air branch pipe 9 Hot air valve 10 Hot air main pipe 11 Slide saddle (size adjustment means)
20 Dimension adjusting means 21 Dimension adjusting unit δ1 Amount of deflection of combustion chamber frame due to brick stacking inside combustion chamber δ2 Relative difference in thermal expansion between combustion chamber and blast mixer during brick drying temperature rise δ3 Lower hot air during brick drying temperature rise Extension amount of branch pipe

Claims (6)

  The heat storage chamber, the combustion chamber, and the blast mixer are separate, and the upper end portion of the heat storage chamber and the upper end portion of the combustion chamber are connected by a connecting pipe without using an expansion joint in the connecting portion, and the intermediate portion of the combustion chamber And the upper end of the blast mixer are connected by an outlet pipe, and the lower end of the blast mixer is connected to a hot air valve via a lower hot air branch pipe, which is constructed by bricks in the combustion chamber. The heat storage chamber according to a deflection amount δ1 of the combustion chamber frame, a relative difference δ2 in thermal expansion between the combustion chamber and the blast mixer when the brick drying temperature rises, and an extension amount δ3 of the lower hot air branch pipe when the brick drying temperature rises And the dimension adjustment at the time of the initial installation of each iron skin of the said combustion chamber and the said blast mixer is performed, The construction method of the hot stove characterized by the above-mentioned.   At the time of initial installation of the iron skin, after the combustion chamber is installed higher than the heat storage chamber by the deflection amount δ1 minutes, the combustion chamber frame is sunk by the deflection amount δ1 by brick stacking in the combustion chamber. The hot stove construction method according to claim 1, wherein the heat storage chamber and the combustion chamber are connected in a state where the pipe is horizontal.   When the iron shell is initially installed, the outlet pipe is in a horizontal state in a state where the hot air valve connecting position of the lower hot air branch pipe with respect to the combustion chamber is raised by the difference between the deflection amount δ1 and the thermal expansion relative difference δ2. The hot air furnace according to claim 1 or 2, wherein the combustion chamber and the blast mixer are connected to each other, and the lifted state at the hot air valve connecting position of the lower hot air branch pipe is released when the temperature of the brick drying is increased. How to build.   At the time of initial installation of the iron skin, the extension of the lower hot air branch pipe when the hot air valve connecting position of the lower hot air branch pipe to the hot air valve is close to the blast mixer side by the extension amount δ3 and when the temperature of the brick drying is increased. The method for constructing a hot blast furnace according to any one of claims 1 to 3, wherein the hot air valve and the lower hot air branch pipe are connected in a state in which an allowance for an amount of δ3 is allowed. The heat storage chamber, the combustion chamber, and the blast mixer are separate, and the upper end portion of the heat storage chamber and the upper end portion of the combustion chamber are connected by a connecting pipe without using an expansion joint in the connecting portion, and the intermediate portion of the combustion chamber And an upper end of the blast mixer are connected by an outlet pipe, and a lower end of the blast mixer is connected to a hot air valve via a lower hot air branch pipe,
Deflection amount δ1 of the combustion chamber frame due to brick stacking in the combustion chamber, a relative difference δ2 in thermal expansion between the combustion chamber and the blast mixer when the brick drying temperature rises, and the extension of the lower hot air branch pipe when the brick drying temperature rises A hot stove characterized by comprising dimension adjusting means for adjusting dimensions at the time of initial installation of each iron skin of the heat storage chamber, the combustion chamber, and the blast mixer according to the amount δ3. The dimension adjusting means includes a dimension adjusting unit for installing the combustion chamber higher than the heat storage chamber by the deflection amount δ1 when the iron skin is initially installed, and the deflection amount δ1 when the iron skin is initially installed. The amount of deflection laid under a slide saddle that supports a hot air valve side end of the lower hot air branch pipe that lifts the hot air valve connecting position of the lower hot air branch pipe with respect to the combustion chamber by a difference from a relative difference in thermal expansion δ2 A liner having a difference thickness of δ1 and a relative difference of thermal expansion δ2, and a hot air valve connecting position of the lower hot air branch pipe with respect to the hot air valve at the time of initial installation of the iron skin to the blast mixer side by the extension amount δ3 in the state that allows the elongation allowance elongation amount δ3 of the lower hot air branch pipe and at the brick drying Atsushi Nobori in a state of close, this of and a said slide saddle for supporting the hot air valve side end of the lower hot-air branch pipes Hot air furnace according to claim 5, characterized in.

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