JP5355955B2 - Vertical firing furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vertical kiln supplying solid fuel to raw material deposition layers in both a preheating space and a baking space. <P>SOLUTION: A fuel supply port 10 for dropping and supplying the solid fuel is formed in a lid wall 3, and an air feeding cylinder 14 formed with an air feeding space vertically penetrated is provided in a kiln body 5. A blowout pipe 18 having a blowout port 18A blowing off air upwardly in the air feeding cylinder 14 through a first air feeding cylinder 22 receiving air from the outside is provided in the air feeding cylinder, and a second air feeding pipe 27 feeding air from the outside into the kiln is connected to the lid wall 3. Air feeding pressure of the first air feeding pipe and air feeding pressure of the second air feeding pipe are fluctuated in the same period and in opposite phase. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a vertical firing furnace apparatus.

  As a vertical firing furnace apparatus, for example, an apparatus disclosed in Patent Document 1 is known. In Patent Document 1, the furnace space is defined as a preheating space above the hearth and a space of the furnace body extending downward from the hearth as a firing space. The raw material to be fired is deposited on the hearth, and the free surface of the deposited layer facing the combustion chamber receives heat from the combustion of fuel ejected from the burner provided on the furnace lid to the combustion chamber, and the firing space. Is preheated by receiving heat from a hot gas that passes through and penetrates the deposited layer from the free surface. The preheated raw material is sequentially dropped from the free surface side into the furnace main body by the pusher or the like from the opening of the hearth to form a deposition layer again in the firing space in the furnace main body, and is fired here.

  The fired raw material falls as it cools in the discharge cylinder provided immediately below the furnace body and falls as a product from a rotary valve provided at the discharge port formed at the lower end of the discharge cylinder. It is taken out.

  In Patent Document 1, liquid fuel is supplied from a burner as fuel, and solid fuel can be supplied together with this. In addition, in this type of apparatus, combustion with only solid fuel is possible.

In Patent Literature 1, solid fuel is dropped and supplied into the furnace from the center position of the furnace lid. The solid fuel falls into the furnace body with some diffusion. The furnace body has a vertical cylindrical diffuser and an ejector that blows air received from the outside upward in the diffuser, and the air flow is generated upward in the range of the diffuser. The solid fuel falls on the upper surface of the deposition layer of the raw material formed outside the diffuser in the furnace body, and burns in the deposition layer while descending, thereby contributing to the firing of the raw material of the deposition layer. .
JP 08-337447 A

  Since solid fuel is cheaper than liquid fuel, there is a demand to rely on solid fuel as much as possible for combustion. At that time, it is also desired to supply the solid fuel also to the raw material deposition layer in the preheating space and enhance the preheating with the solid fuel from the preheating time.

  However, since the specific gravity of solid fuel is larger than that of liquid fuel, as in Patent Document 1, the solid fuel diffuses slightly in the radial direction in the furnace body, and the deposited layer formed outside the diffuser in the furnace body. Although the air reaches the upper surface, the blown air from the ejector does not reach the preheating space located above, so that the solid fuel does not diffuse greatly in the radial direction of the furnace in this preheating space. It does not reach the deposition layer on the hearth.

  That is, if the strength of the blown air from the ejector is set to such an extent that the solid fuel reaches the upper surface of the deposition layer formed outside the diffuser in the furnace body, the solid fuel is If the blown air is set so strongly that the solid fuel does not reach the sedimentary layer on the floor and the solid fuel reaches the sedimentary layer on the hearth of this preheating space, the diffusion of the solid fuel in the radial direction is too large. , You will not get stuck in the deposit layer in the main body of the furnace.

  In view of such circumstances, the present invention is a vertical combustion that can supply solid fuel not only on the raw material deposition layer in the furnace body in which the firing space is formed but also on the raw material deposition layer on the hearth in the preheating space. It is an object to supply a furnace apparatus.

The vertical firing furnace apparatus according to the present invention has an annular plate-like shape that extends radially outward with respect to the vertical center line of the vertical furnace body and has a drop opening formed in the central area in the radial direction. has a hearth, a furnace floor, a cylindrical wall extending upwardly with hearth outer peripheral position, busy technique the upper end of the cylindrical wall, and the furnace lid of the central portion, located around the furnace lid A preheating space is formed by a space surrounded by a lid wall having a top plate portion, a firing space is formed in the furnace body hanging from the falling opening inner edge of the hearth, and the furnace body is below the furnace body A cooling space is formed inside a discharge cylinder having a discharge port at the lower end.

In such a vertical firing furnace apparatus, in the present invention, a fuel supply port for dropping supply of solid fuel is provided in the furnace lid portion of the lid wall, and the raw material is dropped and supplied to the furnace floor on the top plate portion of the lid wall. The feed cylinder is connected to the inside of the furnace body, and a feed cylinder is formed in the furnace body, and the air is fed through the first feed pipe that receives air from the outside. A blow pipe having a blow-out port that blows upward in the cylinder is disposed in the feed cylinder, and a second air feed pipe that feeds air from the outside into the furnace is connected to the furnace lid portion of the lid wall. By changing the air supply pressure of the first air supply pipe and the air supply pressure of the second air supply pipe in the same period and under an opposite phase , the solid fuel is changed in the deposition layer and the firing space on the hearth in the preheating space. It is characterized by being alternately supplied to the deposited layer in the furnace body .

  According to the present invention having such a configuration, when the air supply pressure of the fluctuating first air supply pipe is high, the blown air from the blow pipe in the feed cylinder is strong, and the solid fuel falling from the fuel supply port is sufficiently pushed up and The solid fuel falls on the upper surface of the deposited layer on the hearth in the preheating space after diffusion because it diffuses greatly out of the radius. Next, when the air supply pressure of the first air supply pipe decreases and the air supply pressure of the second air supply pipe increases, the falling solid fuel is pushed up by the blowing air from the cylinder and diffuses in the radial direction. Since the momentum of the air blown up by the one air pipe is weakened, the degree of diffusion is small, and at the same time, the air pressure in the second air pipe is increased, so the momentum of the blowdown is strong and the solid fuel is sent. As soon as it diffuses in the radial direction to the outside of the cylinder, it falls and falls onto the deposition layer in the furnace body in the firing space.

  In the present invention, since the air pressures of the first air pipe and the second air pipe are alternately increased, the solid fuel is also alternately turned into a deposited layer on the hearth in the preheating space and a deposited layer in the furnace body in the firing space. It will be dropped and supplied. Therefore, the preheating is also improved by the combustion of the solid fuel in the deposited layer in the preheating space, and as a result, the subsequent firing in the firing space is promoted.

  Solid fuel usually contains a mixture of fine particles and coarse particles. When the solid fuel is dropped and supplied from the fuel supply port, the fine particles float in the combustion space directly under the lid wall, and burn here to increase the temperature of the combustion gas. As described above, the coarse particles are dropped into the deposition layer on the hearth and the deposition layer in the furnace body by the air from the first and second air supply pipes, and burned in the layer surface and in the layer, respectively. Increase the temperature.

  In the present invention, the first air supply tube and the second air supply tube can be connected to separate pressure sources. In this case, it is necessary to adjust the pressure by the pressure adjusting means so that the phases of the air pressures fluctuating in both air pipes are always opposite to each other. As a feature in this case, the air pressures of the two air pipes are interlocked under the condition that the phases are opposite to each other as described above, but there is an advantage that the pressure itself can be set independently.

  In the present invention, the first air supply pipe and the second air supply pipe extend from the air supply main pipe connected to one pressure source, and are either the first air supply pipe or the second air supply pipe. On the other hand, an on-off valve that repeats opening and closing periodically may be provided. By doing so, there is an advantage that only one pressure source is required, the apparatus is simplified, and the relationship between the air supply pressures fluctuating between the two air supply pipes is surely opposite in phase. In this case, if the opening / closing valve is provided in the second air supply pipe, the first air supply pipe is always supplied with air regardless of opening / closing of the on / off valve, and there is blowing from the cylinder. Even if this blow-up is weak when the on-off valve is open, the solid fuel diffuses somewhat in the radial direction and does not fall into the feed cylinder.

  In the present invention, if the opening / closing time of the on-off valve can be changed, the average time of the solid fuel to the deposition layer on the hearth in the preheating space and the deposition layer in the furnace body in the firing space The distribution ratio can be changed and set according to the change of the operating conditions.

  In the present invention, it is preferable that the average value of the air pressure in the first air pipe is set higher than the average value of the air pressure in the second air pipe. The solid fuel that falls due to gravity is pushed upward by the blow-up flow and diffuses in the radial direction. Therefore, the air supply pressure of the first air supply pipe that contributes to this blow-up flow must be higher than the air supply pressure of the second air supply pipe. Is preferable.

  In the present invention, as described above, a blow pipe that blows upward the air sent from the first air feed pipe is arranged in the feed cylinder arranged in the furnace body, and the solid fuel supply port is provided on the lid wall. Since the second air pipe is connected to the lid wall, the air pressure of the first air pipe and the air pressure of the second air pipe are varied in the same cycle and in opposite phases. When the air pressure in the one air pipe is high, the air pressure in the second air pipe is low, and the solid fuel is blown up by the air from the blow pipe and diffuses outward in the radius. When falling to the bed and having the opposite pressure relationship, the diffusion is relatively small, so the solid fuel falls onto the deposited bed in the furnace body. Thus, the solid fuel is also supplied to the deposition layer on the hearth to promote preheating, and the necessary amount of solid fuel is also supplied to the deposition layer in the furnace body to enhance the firing effect of the sufficiently preheated raw material.

  The solid fuel obtained in the market is a mixture of fine particles and coarse particles. The fine particles float in the combustion space and raise the combustion gas to a high temperature, and the coarse particles are in the first and second air supply pipes that fluctuate in opposite phases. The feed pressure distributes and supplies the deposit to the deposit layer on the hearth and the deposit layer in the furnace body, and burns in the layer surface and in the layer to raise the temperature of the raw material. There is also an effect that it can be used as it is without being atomized.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a longitudinal sectional view of a vertical firing furnace apparatus according to the present embodiment. As shown in FIG. 1, the vertical firing furnace apparatus 1 includes a raw material and fuel supply unit I, a preheating unit II, a firing unit III, and a discharge unit IV in this order from above.

  The raw material and fuel supply unit I is provided above the preheating unit II, has a raw material storage tank (not shown), and stores the raw material M in its internal space. The raw material M is introduced into the raw material storage tank by a conveyor or the like (not shown), and dropped into the preheating section II through the raw material supply pipes 2 provided from a plurality of positions in the circumferential direction of the bottom wall of the raw material storage tank. Supplied.

  As shown in FIG. 1, a preheating section II is provided below the raw material and fuel supply section I. The preheating unit II includes a cylindrical wall 4 that hangs down from the peripheral edge of the non-rotating lid wall 3, and an upper end of a vertical cylindrical furnace body 5 that rotates relative to the cylindrical wall 4 to a lower end position of the cylindrical wall 4. A preheating space is formed in a space between the hearth 6 extending in the radial direction.

  The lid wall 3 has a central furnace lid portion 7 and a top plate portion 8 positioned around the furnace lid portion 7, and the furnace lid portion 7 has a substantially spherical shape, It is connected to the inner edge of the top plate portion 8 by a short tube portion 9 that hangs from the periphery. The top plate portion 8 is connected to the raw material supply pipes 2 at a plurality of positions in the circumferential direction, and the raw material M dropped and supplied from the raw material supply pipes 2 is deposited on the hearth 6. The upper surface of the layer is deposited in the space between the tubular wall 4 and the short tubular portion 9 with an angle of repose. A fuel supply port 10 is provided at the center position of the furnace lid portion 7, and the fuel supplied from the fuel supply port 10 is ignited by an ignition device 10A provided in the vicinity of the fuel supply port 10, Combustion is performed in a combustion chamber formed below the furnace lid portion 7, and a flame spreads in the combustion chamber. In the present invention, the fuel supplied from the fuel supply port 10 is a granular solid fuel. The cylindrical wall 4 supports rod-like pushers 11 extending in the radial direction and reciprocating in the same direction at a plurality of positions in the circumferential direction. By the reciprocating motion of the pusher 11, a drop opening 12 formed in the center of the hearth 6 from the free surface where the deposited layer of the raw material M formed on the hearth 6 faces the combustion chamber with an angle of repose. After that, the raw material M falls.

  The raw material supply pipe 2 is provided with a branch pipe (not shown), and the branch pipe forms an exhaust pipe. The exhaust pipe is connected to a device (not shown) for treating the exhaust gas.

Below the preheating part II, a firing part III is formed with the inside of the vertical cylindrical furnace body 5 extending downward from the drop opening 12 of the hearth 6 as a firing space.

  The furnace body 5 forming the firing part III is rotationally driven around the vertical center line X by a driving means (not shown), and is between the outer peripheral edge of the hearth 6 and the lower edge of the cylindrical wall 4. With the rotary seal 6A, relative rotation with the non-rotating cylinder wall 4 is allowed in a sealed state. The outer surface of the furnace body 5 has a stepped portion in the middle in the vertical direction, and an annular supported wheel 5A is attached to the lower surface of the stepped portion, and an annular support 15 provided on the fixed floor A support wheel 15A rotatably provided at a plurality of positions in the circumferential direction supports the supported wheel 5A. The supported wheel 5A travels on the support wheel 15A, and the furnace body 5 rotates around the center line X.

  The inner diameter surface of the furnace body 5 is slightly expanded downward from the position of the drop opening 12 of the hearth 6, then extends downward in a vertical cylindrical shape, and is reduced in diameter at the lower part. In the furnace body 5, as shown in FIG. 1, a feed cylinder 14 is arranged on the center line X of the furnace body 5. The feed cylinder 14 is supported by being connected to the furnace body 5 by a bridge (not shown) extending in the radial direction at a plurality of positions in the circumferential direction. The cylinder 14 may have a cylindrical inner surface having the same diameter in the vertical direction as shown in FIG. 1, or a conventionally used ejector having a lower inner surface having a throat. The diameter may be expanded upward.

  An air blowing device 16 is provided in the lower area in the furnace body 5. The air blowing device 16 includes an air supply box 17 and an outlet pipe 18 attached to the air supply box 17 and extending upward. The air supply box 17 is supported in a radial direction at a plurality of positions in the circumferential direction. The arm 19 is supported by the furnace body 5. The air blowing device 16 receives air from the outside through a rotary joint 20 connected to the lower part of the air supply box 17 and, as shown in FIG. 1, the tip of the blowing pipe 18 connected to the upper part. Air is blown upward from the air outlet 18A (upper end in the figure). The air blowing device 16 is protected from surrounding raw materials by a protective skirt 18B attached to an intermediate portion of the blowing pipe 18 and extending downward. The lower end of the protective skirt 18B is open. The air supply box 17 supported on the furnace main body 5 by the support arm 19 rotates with the rotation of the furnace main body 5, and the air supply box 17 is stationary via the rotary joint 20 that allows relative rotation. Connected to the relay box 21 to be connected. The relay box 21 is connected to a first air supply pipe 22 that supplies air from the outside to the relay box 21 at a position below the protective skirt 18B. The first air supply pipe 22 will be described later again.

  The furnace body 5 is allowed to rotate relative to the discharge cylinder 23 of the non-rotating discharge portion IV provided below in a sealed state by a rotary seal 24. The discharge part IV has a substantially conical discharge cylinder 23 that is reduced in diameter toward the lower side, and the air supply relay box 21 is arranged at an upper position inside. The discharge cylinder 23 has a discharge port 23A at the lower end, and the discharge port 23A is provided with a rotary valve 23B. By rotating the rotary valve 23B, the raw material M that has been sufficiently baked and cooled, that is, the product, is discharged to the outside while sealing the inside and outside of the furnace. The discharge port 23A is connected to another air supply pipe 23C that receives air from the outside. This air rises in the deposited layer in the furnace body 5 to generate an air flow P for cooling the raw material.

  As described above, the relay box 21 disposed at the upper inside position of the discharge cylinder 23 is connected to the air supply box 17 and the rotary joint 20 thereabove, and air is supplied from the outside to the relay box 21. A first air supply pipe 22 for supplying air is connected. The first air supply pipe 22 extends outside the furnace through the discharge cylinder 23, and is connected to a pressure source 26 such as a blower through an air supply main pipe 25. A second air supply pipe 27 branches and extends from the air supply main pipe 25 separately from the first air supply pipe 22, and the second air supply pipe 27 is connected to the fuel supply port 10 provided in the furnace lid portion 7. It is connected. The second air supply pipe 27 is provided with an on-off valve 28 that periodically opens and closes.

  Next, the operation principle of the apparatus of this embodiment as described above will be described with reference to FIGS. FIG. 1 shows a state in which the on-off valve 28 is in a closed state, and FIG. 2 shows a state in which the on-off valve 28 is in an open state.

  First, the raw material M is thrown into the raw material storage tank and stored. The stored raw material M falls in the raw material supply pipe 2 and forms a deposition layer on the hearth 6 with an angle of repose.

  A solid fuel in which fine particles and coarse particles are mixed is dropped and supplied from the fuel supply port 10 located in the furnace lid portion 7, and the fine particles floating in the combustion chamber directly under the furnace lid portion 7 are ignited by the ignition device 10 </ b> A. Burn in the combustion chamber. The combustion gas generated by this combustion heats the deposited layer of the raw material M on the hearth 6 from its free surface. Thus, the raw material M preheated by being heated on the hearth 6 gradually falls from the free surface of the deposited layer to the furnace body 5 through the drop opening 12 by the action of the pusher 11.

  The preheated raw material M that has fallen from the drop opening 12 forms a deposition layer again in the furnace body 5. The raw material M of the deposited layer is gradually taken out from the discharge port 23A by the rotation of a rotary valve provided at the discharge port 23A at the lower end of the discharge cylinder 23, whereby the furnace body 5 is gradually removed. Descend inside. The raw material M in the furnace body 5 is sufficiently baked until it reaches the outlet 23A, and flows into the outlet body 23A and rises between the grains of the raw material M in the deposited layer in the furnace body 5. When the raw material M drops and reaches the discharge port 23A by the air flow P from the outside, it is sufficiently cooled.

  Thus, the fired and cooled raw material M is taken out as a product from the outlet 23A.

  In the present embodiment, the external air is supplied from the pressure source 26 through the first air supply pipe 22 and the second air supply pipe 27 into the furnace under an antiphase air pressure.

  As shown in FIGS. 1 and 2, the air supplied from the first air supply pipe 22 reaches the air supply box 17 from the relay box 21 through the rotary joint 20, and ascends the blow pipe 18 from here. In the cylinder 14, it blows out upward from the blower outlet 18A. The air blown from the air outlet 18A generates an upward flow that extends upward and radially outward in the combustion chamber. On the other hand, the air supplied from the second air supply pipe 27 generates a downflow that blows down from the fuel supply port 10 into the furnace.

  In the present embodiment, the open / close valve 27 provided in the second air supply pipe 27 is periodically opened and closed, and the air supply pressure in the second air supply pipe 27 periodically varies, and accordingly, the first air supply pipe. The air supply pressure in 21 also varies periodically. Since the on-off valve 27 is provided in the second air supply pipe 27 in the present embodiment, the air supply pressure is periodically supplied to the first air supply pipe 21 although the air supply pressure fluctuates periodically. From 18A, air is constantly blown upward to generate the upward flow.

  The periodic opening and closing of the on-off valve 27 brings an inverse phase relationship to the periodic fluctuation of the air supply pressure in the first air supply pipe 22 and the second air supply pipe 27. That is, when the air pressure of the second air pipe 27 is high, the air pressure of the first air pipe 22 is low, and when the air pressure of the second air pipe 27 is low (or zero), the air pressure of the first air pipe 22 is low. Get higher.

FIG. 1 shows a state in which the on-off valve 28 provided in the second air supply pipe 27 is completely or almost closed. In this state, there is no or very little air flow blown down from the fuel supply port 10. Therefore, there are no or weak winds. On the other hand, upward flow Q ₁ is, at this time, since a strong blow from the air outlet 18A, strong with increasing flow Q ₁ produces, because it provides a suction pressure feed cylinder 14, on the deposited layer in the furnace body 5 resulting penetration flow Q ₂ of the combustion gas flowing toward the in-feed end opening of the cylinder 14 after the descent approach the surface. At the same time, the air flow P to increase the intergranular ingress to the material M from the discharge port 23A is also increased enters the above feed cylinder 14, reaches into the combustion chamber to form the approach flow Q ₂ and upward co-current Contributes to combustion. It said upflow Q ₁ is a solid fuel to fall from the fuel supply port 10 allowed large spread radially outward, whereas the approach flow Q ₂ is by allowed to enter the combustion gas into the upper portion of the deposited layer, in the upper layer portion Promote the heating of raw materials.

Thus, in the state of FIG. 1, a strong upward flow Q ₁ is, diffusion causes the coarse solid fuel to fall pushed and radially outwardly. Therefore, the solid fuel falls under the diffusion flow R onto the deposition layer on the hearth 6 in the preheating part II. This solid fuel increases the preheating by heating the raw material M in the preheating section II by combustion.

Next, when the on-off valve 28 is opened, a large amount of air is sent to the fuel supply port 10 through the second air supply pipe 27 as shown in FIG. In contrast, the air blown out from the air outlet 18A through the first air supply pipe 22, although balloon in which, the flow is weak, so that the upward flow Q ₁ is a solid fuel to fall not within the air cylinder 14 A diffusion flow R that is diffused outward in the radius is formed. In such a state, the coarse particles of the solid fuel falling from the fuel supply port 10 do not diffuse to the extent that they reach the deposition layer on the hearth 6, and between the furnace body 5 and the feed cylinder 14, It falls on the deposited layer in the furnace body 5 and descends as the raw material falls. Thus, the coarse particles of the solid fuel that have fallen into the deposited layer in the furnace body 5 promote the firing of the raw material.

Further, in the state of FIG. 2, since the upward flow Q ₁ is not strong, feeding suction pressure of the cylinder 14 is very small, without causing a penetration flow Q ₂ as shown in FIG. 1, deposited layer enters from the exhaust port 23A The air flow P that rises between the grains and counter-flows with the descending raw material rises outside the feed cylinder 14. This air flow P cools the raw material when it rises in the deposition layer, and itself becomes a high temperature by heat exchange with the raw material and reaches the combustion chamber to contribute to combustion.

  Thus, in the present embodiment, the solid fuel is alternately supplied to the deposited layer on the hearth and the deposited layer in the furnace body only by periodically opening and closing the on-off valve 28, and preheating and firing in the preheating section II. The firing in part III will be promoted.

  In the present embodiment, the “closing” of the on-off valve 28 provided in the second air supply pipe 27 does not necessarily mean that the on-off valve 28 is completely closed, as described above. Also means. Also, the opening time and closing time in periodic opening and closing need not be the same length. Such open / close conditions of the open / close valve are appropriately set according to the amount of raw material, the amount of solid fuel, the type, and the combustion state.

  The present invention is not limited to the illustrated form, and various modifications can be made. First, the hearth can be rotated or not rotated. When the hearth rotates, the fuel supply port and the second air supply pipe do not need to be provided at the center position of the lid wall of the furnace, and may be in an eccentric position. By positioning it eccentrically, the fuel supply port approaches the deposited layer on the hearth, and it becomes easy to supply the solid fuel to the deposited layer. Further, since the fuel supply port is located eccentrically, the feed cylinder is not located immediately below it, and solid fuel does not fall into the feed cylinder. Therefore, the air supply pressure in the first air supply pipe can be lowered, and the pressure source can be downsized. Further, as long as the hearth is rotating, the solid fuel fall distribution is kept uniform in the circumferential direction. Of course, the fuel supply port and the second air supply pipe may be provided at the central position and also at the eccentric position. Furthermore, the fuel supply port and the second air supply pipe may be provided at different positions.

It is a longitudinal cross-sectional view of one Embodiment apparatus of this invention, and has shown the mode when the on-off valve provided in the 2nd air supply pipe is a closed state. FIG. 1 shows a state when the on-off valve is open in the apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Cover wall 5 Furnace main body 10 Fuel supply port 14 Cylinder 18 Blowout pipe 18A Outlet 22 First air supply pipe 25 Air supply main pipe 26 Pressure source 27 Second air supply pipe 28 On-off valve

Claims (6)

An annular plate-shaped hearth that extends radially outward with respect to the vertical center line of the furnace main body at the top of the vertical furnace main body and has a drop opening formed in the radial central region; Surrounded by a cylindrical wall that extends upward at the outer peripheral edge of the hearth, a lid wall that closes the upper end of the cylindrical wall, has a central furnace lid, and a top plate located around the furnace lid. A discharge cylinder having a preheating space formed by the space formed, a firing space formed in the furnace body hanging from the inner edge of the drop opening of the hearth, and connected to the furnace body below the furnace body and having a discharge port at the lower end In a vertical firing furnace apparatus that forms a cooling space inside,
A fuel supply port for dropping supply of solid fuel is provided in the furnace lid portion of the lid wall, and a raw material supply pipe for dropping and supplying the raw material to the hearth is connected to the top plate portion of the lid wall. A blow-out pipe having a blow-out port in which a feed cylinder in which an air-feed space is formed is disposed in the furnace body and blows the air upward in the feed cylinder via a first feed pipe that receives air from the outside. Is disposed in the cylinder, and a second air supply pipe for supplying air from the outside into the furnace is connected to the furnace lid portion of the lid wall. By changing the air pressure of the trachea in the same cycle and in the opposite phase, the solid fuel is alternately supplied to the deposit layer on the hearth in the preheating space and the deposit layer in the furnace body in the firing space. A vertical firing furnace characterized by:
  The vertical firing furnace according to claim 1, wherein the first air supply pipe and the second air supply pipe are connected to separate pressure sources. The first air supply pipe and the second air supply pipe are branched and extended from the air supply main pipe connected to one pressure source, and the first air supply pipe and the second air supply pipe are periodically opened and closed. vertical firing furnace according to claim 1, characterized in that the opening and closing valve is provided repeating manner.   The vertical firing furnace according to claim 3, wherein the on-off valve is provided in the second air supply pipe.   The vertical firing furnace according to claim 3 or 4, wherein the opening / closing time of the opening / closing valve can be changed.   6. The vertical firing furnace according to claim 1, wherein an average value of air pressure in the first air pipe is higher than an average value of air pressure in the second air pipe.

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