JP2009192176A - Vertical kiln - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vertical kiln distributing solid fuel in raw material and capable of supplying it on a hearth. <P>SOLUTION: A raw material storage tank 1 arranged in an upper position of a lid wall 16 in an exterior is connected to a raw material supply opening via a plurality of raw material supply pipes 3, a fuel supply apparatus is connected to a fuel supply opening of the lid wall 16, the fuel supply apparatus has a fluid fuel supply apparatus and a solid fuel supply apparatus, the fluid fuel supply apparatus is connected to a fluid fuel supply opening 23 formed in a furnace lid part 20, the solid fuel supply apparatus has solid fuel drop pipes 11, 12 suspended from a force feed pipe at plural positions in a force feed direction of the force feed pipe 6, the solid fuel drop pipe 12 of a force feed direction downstream end side position is pierced through the raw material storage tank 1 and connected to a solid fuel supply opening of the furnace lid part, each of the other solid fuel drop pipes 11 is penetratingly arranged in the raw material storage tank 1, and lower end openings are positioned above corresponding upper end openings of the raw material supply pipe 3 in the raw material storage tank 1. <P>COPYRIGHT: (C)2009,JPO&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 gas from the combustion of the liquid fuel ejected from the burner provided on the furnace lid to the combustion chamber At the same time, it is preheated by receiving heat from a hot gas that rises in the firing space and enters the deposition layer from the free surface and permeates. This preheating is mainly performed from the free surface side. The preheated raw material falls from the free surface side to the drop opening formed in the center of the hearth by the pusher or the like to form a deposited layer again in the firing space, and is fired here.

In such Patent Document 1, the liquid fuel from the burner is injected into the combustion chamber. Accordingly, combustion is performed in the combustion chamber, and the raw material is preheated by being heated on the free surface. Moreover, in patent document 1, in addition to liquid fuel, solid fuel can also be used as fuel. The solid fuel supply port is provided in the furnace lid adjacent to the burner. Even in the case of using this solid fuel together, the solid fuel is supplied into the combustion chamber, so the solid fuel is burned together with the liquid fuel in the combustion chamber to heat the deposited layer of the raw material on the hearth from the free surface. To do.
JP 08-337447 A

  However, in Patent Document 1, the raw material deposition layer on the hearth is heated higher than the inside of the layer because the free surface side faces the combustion gas. The temperature difference is large.

  This temperature difference is preferably as small as possible. For example, the raw material is pushed by the pusher etc. and falls sequentially from the free surface side, but if the amount of fall is large, even if the raw material is slightly inside the free surface, it will fall before it is sufficiently preheated It can be. As a result, problems such as insufficient preheating and uneven temperature occur.

  Therefore, the solid fuel is mixed with the raw material in advance, supplied as a mixture onto the hearth, the solid fuel in the deposited layer is burned, and in addition to heating from the free surface of the deposited layer, the solid fuel is also contained in the deposited layer. A method of heating the raw material by combustion is conceivable. However, in order to mix the solid fuel with the raw material in the step before supplying the raw material to the hearth, a large mixing device is required. Further, during the transfer of the mixture toward the hearth, there is a possibility that the solid fuel is unevenly distributed in the mixture and is not uniformly dispersed due to a difference in particle size and specific weight between the raw material and the solid fuel.

  In view of such circumstances, the present invention burns solid fuel together with fluid fuel in the combustion chamber, mixes the solid fuel into the raw material and burns it in the raw material deposition layer, and solids in the deposition layer. It is an object of the present invention to provide a vertical firing furnace apparatus that can uniformly disperse fuel in a raw material.

  A vertical firing furnace apparatus according to the present invention includes an annular plate-shaped hearth that extends in the radial direction 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. A preheat space is formed by a space surrounded by the hearth, a cylindrical wall extending upward at the outer peripheral edge of the hearth, and a lid wall that closes an upper end of the cylindrical wall, and a drop opening of the hearth A firing space is formed in the furnace body depending from the inner edge, and the lid wall has an annular top plate portion forming a radially outer region portion and a furnace lid portion forming a radially inner region portion from the top plate portion. The raw material storage tank disposed at the upper position of the lid wall outside the furnace is connected to the raw material supply port of the top plate portion through a plurality of raw material supply pipes hanging from the tank bottom, and is provided outside the furnace. A fuel supply device connected to the fuel supply port of the lid wall.

  In such a vertical firing furnace apparatus, in the present invention, the fuel supply apparatus includes a fluid fuel supply apparatus and a solid fuel supply apparatus, and the fluid fuel supply apparatus is a fluid fuel formed in the furnace lid portion at the center of the lid wall. The solid fuel supply device, connected to the supply port, has a solid fuel dropping pipe that hangs down from the pumping pipe at a plurality of positions in the pumping direction of the pumping pipe extending from the solid fuel supply source, and the solid fuel falling at the downstream end position in the pumping direction A pipe is connected to the solid fuel supply port of the furnace lid, each other solid fuel dropping pipe is rushed into the raw material storage tank, and the lower end opening is the upper end opening of the corresponding raw material supply pipe in the raw material storage tank. It is characterized by being located above. In the present invention, fluid fuel refers to fuel having at least one of liquid fuel and gaseous fuel.

  According to the present invention having such a configuration, fluid fuel is injected from a fluid fuel supply port provided in the furnace lid portion, for example, a burner, and burns in a combustion chamber formed immediately below the furnace lid portion.

  On the other hand, the solid fuel is pumped in the pumping pipe and falls into the solid fuel dropping pipe in order from the solid fuel dropping pipe on the upstream side in the pumping direction. Since the lower end opening of the other solid fuel dropping pipes, excluding the solid fuel dropping pipe on the downstream end side in the pumping direction, is located above the upper end opening of the raw material supply pipe in the raw material storage tank, The solid fuel falling from the lower end opening of the gas is dropped in the raw material supply pipe together with the raw material so as to be drawn out from the solid fuel dropping pipe by the raw material introduced into the raw material supply pipe at the bottom of the tank around the lower end opening. A deposited layer is formed on the floor while being mixed with the raw material. The solid fuel to be pumped remains even after the solid fuel dropping pipe is sequentially dropped during the pumping, and it falls from the solid fuel dropping pipe on the downstream end side located in the furnace cover. Thus, all of the pumped solid fuel falls from the solid fuel drop tube.

  Therefore, the solid fuel falling from the solid fuel dropping pipe on the downstream end side in the pumping direction located in the furnace lid is supplied to the combustion chamber formed immediately below the furnace lid, and combusted together with the fluid fuel in the combustion chamber. Then, the mixture of the raw material and the solid fuel on the hearth is heated from the free surface side of the deposited layer.

  As described above, the solid fuel that has fallen from the solid fuel dropping pipe on the upstream side of the solid fuel dropping pipe on the downstream end side exists in the deposited layer of the mixture on the hearth, and burns in the deposited layer. The raw material is heated in the deposited layer.

  Thus, the raw material forming the deposited layer is heated from the free surface side and from the inside, and is preheated in a thermally efficient and almost uniformly mixed state throughout the deposited layer.

  In the present invention, the solid fuel falling from the solid fuel drop pipe other than the solid fuel drop pipe on the downstream end side in the pumping direction is, as described above, around the lower end opening of the solid fuel drop pipe in the raw material storage tank. Since it falls so as to be drawn out by the falling raw material, when the amount of the raw material falls is large, the solid fuel also falls and the mixing ratio is extremely stable. Moreover, since the raw material and the solid fuel fall through the same raw material supply pipe, they are mixed and distributed extremely uniformly on the hearth.

  In the present invention, the raw material supply pipes are provided at a plurality of positions in the circumferential direction around the vertical center line of the furnace main body, the pressure feed pipe is a circumferential portion extending in the circumferential direction above the raw material supply pipe, and a downstream of the pressure feed pipe On the end side, radially inward, reaching the solid fuel drop pipe connected to the solid fuel supply port of the furnace lid, and the upstream of pumping connecting the upstream end of the circulating portion and the solid fuel supply source Part. In such a configuration, when the solid fuel to be pumped is pumped in the circulating section, the solid fuel falls on the hearth together with the raw material sequentially from the circulating section through the solid fuel dropping pipe and the raw material supply pipe, and at the downstream end side. The gas is supplied to the combustion chamber from the radial direction through the solid fuel dropping pipe.

  In the present invention, it is preferable that the solid fuel dropping pipe that enters into the raw material storage tank has a flange-shaped resistance portion that protrudes radially outward at the lower end opening or at a position immediately above the lower end opening. The lower end opening of the solid fuel dropping pipe is located in the raw material in the raw material storage tank, but since a space without raw material is formed immediately below the resistance portion, the solid fuel falls from the lower end opening. Is done smoothly.

  In the present invention, the lower end opening of the solid fuel dropping pipe at the downstream end position in the pumping direction is connected to an injector having a fluid fuel supply port so that the solid fuel and the fluid fuel are mixed and injected into the furnace by the injector. It can be made to be. By doing so, when the fuel is ejected from the injector, the solid fuel and the fluid fuel are already mixed and the combustion is stabilized.

  When the injector is provided, the lower end opening of the solid fuel dropping pipe is preferably opened in a tangential direction with respect to a circumference having the injection direction of the injector as a center line. By doing so, the combustion gas in the combustion chamber generates a swirling flow, and uniform combustion is performed over a wide range in the combustion chamber.

  In the present invention, the pressure feeding pipe falls at the upper end opening position of the solid fuel dropping pipe in the circulating portion to provide resistance to the flow of the solid fuel to be pumped and promote the fall of the solid fuel to the above-mentioned end opening. It is preferable to have a promotion device. Various forms are conceivable as the drop promoting device. For example, at the downstream edge position of the upper end opening, a part of the flow of the solid fuel being pumped is received and guided to the upper end opening, or closed so that the flow is temporarily stopped. Further, the damper member can be reopened, and the solid fuel dropping pipe can be periodically or constantly vibrated to promote the falling of the solid fuel.

  In the present invention, the fall facilitating device is constituted by a damper member provided at the downstream edge of the upper end opening of each solid fuel dropping pipe in the circulating portion, and the damper member opens the upper end opening in the closed position. In the closed and open positions, it is positioned so as to provide resistance to the lower flow in the circulating pipe and allow the upper flow, and the selected damper member among the above-mentioned damper members is brought to the open position in turn. The damper member can be in the closed position.

  In such a configuration, for example, when the solid fuel dropping pipes in the circulating part are provided at eight places in the circumferential direction of the circulating part, only the damper member of the solid fuel dropping pipe in the most upstream position is in the open position, When the seven damper members are in the closed position, the solid fuel flowing in the circulating section collides with the damper member in the uppermost flow position in the open position, and the solid fuel flowing in the circulating section pipe enters the upper end opening of the solid fuel dropping pipe. The upper layer flow in the circulating pipe passes through the damper member and flows downstream. The solid fuel is a mixture of coarse particles and fine particles, but due to the difference in weight between them, the lower flow is occupied by heavy coarse particles in the solid fuel. Inflow. On the other hand, the upper layer flow is occupied by light fine particles, which pass through the damper member and flow downstream in the circulation portion, and are supplied from the solid fuel dropping pipe on the downstream end side to the combustion chamber. Further, the other seven damper members of the rotating part other than the damper member in the open position are in the closed position, and the solid fuel passes neither the coarse particles nor the fine particles into the solid fuel drop pipe and passes downstream. Flowing. Further, the solid fuel dropping pipe on the downstream end side is not provided with a damper member, and the fine particles always flow in and are supplied to the combustion chamber.

  When the state in which the damper member at the most upstream position is in the open position has elapsed for a predetermined time, the damper member is brought to the closed position, and the damper member positioned next is opened. As described above, in the circulating portion, the damper members are brought into the open position one by one, and the solid fuel is sequentially introduced and dropped into each solid fuel dropping pipe in which the damper member is opened. Also in this case, the coarse solid fuel flows in, and the fine particles form an upper layer flow in the circulating pipe and pass through the damper member toward the downstream.

  The number of damper members brought to the open position, the order of the open position state, and the time at the open position are arbitrarily set according to the firing state in the furnace.

  Furthermore, in the present invention, the furnace body may have an air blowing device that blows air received from the outside upward in the furnace body. By doing so, the blown-up air is supplied to the combustion chamber as combustion air to promote combustion, while the combustion gas is stirred up and kept in the combustion chamber for a long time to effectively preheat the raw material.

  In the present invention, as described above, the solid fuel dropping pipe is inserted into the raw material storage tank in which the raw material is temporarily stored in order to supply the raw material to the hearth through the raw material supply pipe. Since the lower end opening of the material storage tank is positioned above the upper end opening of the raw material supply pipe, when the raw material in the raw material storage tank is dropped from the raw material supply pipe to the hearth, The solid fuel falls from the lower end opening of the solid fuel dropping pipe so as to be drawn out to the dropped raw material, and is deposited on the hearth while being mixed with the raw material. Therefore, the solid fuel and the raw material are mixed without requiring an apparatus having a complicated movable part, and both are dropped from the same raw material supply pipe and deposited on the hearth, so that the mixed state becomes uniform. Furthermore, after the solid fuel to be pumped falls sequentially from a plurality of solid fuel dropping pipes, the remaining solid fuel from the solid fuel dropping pipe on the downstream end side in the pumping direction is combusted together with the fluid fuel at the furnace lid position. Therefore, all of the solid fuel to be pumped is used up, and treatment such as disposal of the remaining solid fuel becomes unnecessary.

  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 an embodiment of the present invention.

  As shown in FIG. 1, the vertical firing furnace device 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 part I is provided above the preheating part II, has a raw material storage tank 1 having a conical shape with the top plate and the bottom plate facing upward, and the raw material M is stored in the internal space. The raw material M is supplied into the raw material storage tank 1 from a charging port 2 provided at the top by a conveyor or the like (not shown), and preheated through a raw material supply pipe 3 provided to hang from a plurality of circumferential positions on the bottom wall. Drop supplied to Part II. The level of the upper surface M-1 of the raw material layer in the raw material storage tank 1 varies depending on the amount of the raw material M input from the input port 2 and the amount of falling from the raw material supply pipe 3.

  A solid fuel supply device 4 is provided outside the raw material storage tank 1. This solid fuel supply device 4 pumps powder particles such as coke or coal as solid fuel, and has a pump 5 and a pumping pipe 6 for pumping. The pumping pipe 6 includes a pumping upstream portion 7 extending upward from the pump 5, a circumferential portion 8 extending from the upper end of the pumping upstream portion 7, and a radial portion 9 extending radially inward from the downstream side of the circumferential portion 8 in the pumping direction. The solid fuel dropping pipes 10 hang down at a plurality of positions of the circulating portion 8 and at a downstream end side position of the radial direction portion 9, respectively. The solid fuel dropping pipe 10 is distinguished by attaching a reference numeral 11 to one that hangs down from the circulating portion 8 and a reference numeral 12 to the one that hangs down from the radial direction portion 9.

  The pumping pipe 6 is connected to a solid fuel supply source (not shown) via a pump 5, and the solid fuel S is pumped by air pressure in the pumping pipe 6 to reach the circulation part 8 and the radial part 9. . The orbiting portion 8 is provided so as to make one round above the conical top plate of the raw material storage tank 1, and the radial direction portion 9 extends radially inward from the downstream end side position of the orbiting portion 8 to extend the raw material storage tank 1. It has rushed into the center. A solid fuel dropping pipe 11 hanging from a plurality of positions of the circulating portion 8 penetrates the top plate portion and enters the raw material storage tank 1, and a lower end opening 11 </ b> A of each solid fuel dropping pipe 11 is formed at the bottom of the raw material storage tank 1. It is located corresponding to directly above the upper opening 3A of each raw material supply pipe 3 depending from the wall 1A. The solid fuel dropping pipe 11 will be described later again. On the other hand, the solid fuel dropping pipe 12 that hangs from the downstream end side of the radial portion 9 also penetrates the bottom wall 1A of the raw material storage tank 1 and reaches the furnace lid in the preheating section II described later, where the lower end opens. ing. As shown in FIG. 2, the solid fuel dropping pipe 11 hanging from a plurality of positions in the circumferential direction 8 of the circulating portion 8 of the pumping pipe 6 and having a lower end opening 11A has a connecting portion 11B with respect to the circulating portion 8 having a funnel-shaped taper portion. The straight pipe portion 11C extends downward from the connection portion 11B. In the present embodiment, the solid fuel dropping pipe 11 has an annular plate flange-shaped resistance portion 13 extending radially outward from the outer peripheral surface at a position near the lower end opening 11A, and directly below the connection portion 11B. It has a damper member 14 for opening and closing the straight pipe portion 11C.

  As shown in FIG. 2, a control plate 15 is provided in the circulating portion 8 of the pressure feeding pipe 6 at a position slightly upstream of the connecting portion 11 </ b> B. The control plate 15 is configured such that the amount of entry from the upper wall portion of the pressure feed pipe 6 into the pressure feed pipe 6 is controlled by driving means (not shown). The connecting portion 11B of the solid fuel dropping pipe 11 has a protruding portion 11B-1 that protrudes into the circulating portion 8 on the downstream side. Thus, the control plate 15 and the protruding portion 11B-1 combine to positively direct the flow of the solid fuel S fed in the circulating portion 8 to the solid fuel dropping pipe 11. Further, the damper member 14 provided immediately below the connecting portion 11B is intermittently closed as appropriate to form a space without solid fuel immediately below the damper member 14, and the solid fuel S is opened when the damper member 14 is opened. Makes the fall of the good. Thus, the control plate 15, the protrusion 11B-1 and the damper member 14 together form a fall promoting device.

  Since a flange-shaped resistance portion 13 is provided in the vicinity of the lower end opening 11A of the solid fuel dropping pipe 11 located immediately above the upper end opening 3A of the raw material supply pipe 3 depending from the bottom wall 1A of the raw material storage tank 1. A space 13 </ b> A having an angle of repose is formed immediately below the resistance portion 13. Due to the presence of the space 13A, the surrounding raw material M smoothly flows down to the upper end opening 3A. With the raw material M flowing down, the solid fuel S falls so as to be drawn out from the lower end opening 11A of the solid fuel dropping pipe 11 and falls together with the raw material M. At that time, as seen in FIG. 2, in the raw material supply pipe 3, the solid fuel S falls in the center, and the raw material M falls while forming a flow around the falling flow of the solid fuel. To do.

  As shown in FIG. 1, a preheating section II is provided below the raw material and fuel supply section I. The preheating section II includes a cylindrical wall 17 that hangs down from the periphery of the non-rotating lid wall 16, and an upper end of a vertical cylindrical furnace body 18 that rotates relative to the cylindrical wall 17 to a lower end position of the cylindrical wall 17. A preheating space is formed in a space between the hearth 19 extending in the radial direction.

  The lid wall 16 has a central furnace lid portion 20 and a top plate portion 21 located around the furnace lid portion 20, and the furnace lid portion 20 has a substantially spherical shape. It is connected to the inner edge of the top plate portion 21 by a short cylindrical portion 22 that hangs from the periphery. The top plate portion 21 is connected to the raw material supply pipes 3 at a plurality of positions in the circumferential direction, and the raw material and solid fuel dropped and supplied from the raw material supply pipes 3 are deposited on the hearth 19. The upper surface of the deposited layer is formed in a space between the cylindrical wall 17 and the short cylindrical portion 22 with an angle of repose. A solid fuel dropping pipe 12 that hangs down from the downstream end side of the radial section 9 of the aforementioned pressure feeding pipe 6 is connected to the center position of the furnace lid section 20, and the solid fuel falling from the lower end opening 11 </ b> A is Then, it combusts together with the fluid fuel injected from the burner 23 as the fluid fuel supply device provided adjacent to the lower end opening 11A. This combustion gas spreads in a combustion chamber formed below the furnace lid portion 20. The cylindrical wall 17 supports rod-like pushers 24 that extend in the radial direction and reciprocate in the same direction at a plurality of positions in the circumferential direction. By the reciprocating motion of the pusher 24, a deposition layer of a mixture of raw material and solid fuel formed on the hearth 19 is formed in the center of the hearth 19 from a free surface facing the combustion chamber with an angle of repose. The raw material M falls through the drop opening 25.

  The raw material supply pipe 3 is provided with a branch pipe obliquely outside the furnace, and the branch pipe forms an exhaust pipe 26. The exhaust pipe 2 is connected to a device (not shown) for processing exhaust gas.

  Below the preheating part II, a firing part III is formed with a vertical cylindrical furnace main body 18 extending downward from the drop opening 25 of the hearth 19 as a firing space.

  The furnace body 18 forming the firing part III is rotationally driven around a vertical center line by a driving means (not shown), and is located between the outer peripheral edge of the hearth 19 and the lower edge of the cylindrical wall 17. With the rotary seal 19A, relative rotation with the non-rotating cylinder wall 17 is allowed in a sealed state.

  The furnace body 18 is slightly expanded downward from the position of the drop opening 25 of the hearth 19, then extends downward in a vertical cylindrical shape, and is reduced in diameter downward at the lower part. In the furnace body 18, as shown in FIG. 3, a feed cylinder 27 is disposed on the vertical center line of the furnace body 18. The feed cylinder 27 is supported by being connected to the furnace body 18 by bridges 28 extending in the radial direction at a plurality of positions in the circumferential direction. This feed cylinder 27 has a constant diameter in the vertical direction as shown by a two-dot chain line, even if the inner diameter surface of the feed cylinder 27 is a conventionally used ejector and has a throat portion and is expanded upward. A cylindrical inner surface may be used.

  An air blowing device 29 is provided in the lower area in the furnace body 18. The air blowing device 29 has an air sending box 30 and a blow pipe 31 attached thereto, and the air sending box 30 has a support arm 32 extending in the radial direction at a plurality of positions in the circumferential direction. Is supported by the furnace body 18. Air from outside is received through a pipe 33 connected to the lower part of the air sending box 30, and air is blown upward from the tip (upper end in the figure) of the blowing pipe 31 connected to the upper part. The upper end of the blow pipe 31 is located in the lower opening of the feed cylinder 27. A plurality of small window portions are formed on the side surface of the air supply box 30, and an eaves-like swash plate 34 is provided on the upper edge of the window portion. Therefore, a non-existence area of raw materials and the like is formed immediately below the swash plate 34, and a part of the external air sent into the air supply box 30 is blown out sideways from the window portion. The furnace body 18 is allowed to rotate relative to the non-rotating discharge part IV provided below the furnace body 18 in a sealed state by a rotary seal 35.

  The discharge part IV has a discharge port 36A at the lower end, has a substantially conical discharge cylinder body 36 whose diameter is reduced downward, and has an air supply device 37 inside. The air supply device 37 includes a box-shaped gas reception gas 38 and two types of gas reception pipes 39A and 39B. The interior of the receiving gas 38 is divided into an upper chamber 38A and a lower chamber 38B. The upper chamber 38A and the lower chamber 38B are configured by an air receiving tube 39A and an air receiving tube 39B extending radially outward at a plurality of circumferential positions. It is connected. These air receiving pipes 39A and air receiving pipes 39B receive air from the outside.

  The upper chamber 38A is connected to the air sending box 30 by the pipe 33. A conical cylinder portion 40 extends from the lower portion of the gas receiving portion 38 in an umbrella shape, and a blow pipe 41 for blowing air downward from the lower chamber 38B extends in the conical tube portion 40. In addition, the air receiving pipe 39B connected to the lower chamber 38B and the air receiving pipe extension 39B-1 projecting in the radial direction are formed with blowout holes 42 for blowing air downward.

  Thus, after the outside air received in the upper chamber 38A through the air receiving pipe 39A reaches the air sending box 30 from the pipe 33, it is blown upward from the air blowing pipe 31, and the air from the air sending box 30 A part is blown out sideways from the window of the air supply box 30. On the other hand, the external air received in the lower chamber 38B through the air receiving tube 39B is blown out from the air blowing tube 41 into the space where there is no raw material formed immediately below the cone tube portion 40, and the air receiving tube 39B and the air receiving tube. The air is blown out from the blowout hole 42 into a space formed immediately below the tracheal extension 39B-1. The air blown out from the blow pipe 41 and the blow hole 42 cools the free surface of the raw material deposition layer in the space and then moves up in the raw material deposition layer.

  The flow rate of the air blown out from the blow-out pipe 31 and rising to the combustion chamber through the feed cylinder 27 and the air permeating and rising through the raw material deposition layer outside the feed cylinder 27 and reaching the combustion chamber can be adjusted. It is preferable that This flow rate ratio is set so that the temperature of the deposited layer becomes a predetermined value. When the feed cylinder 27 is an ejector having a throat, the outlet pipe 31 prevents the pressure in the lower end opening of the feed cylinder 27 from becoming a large negative pressure so that the air in the deposited layer does not flow into the lower end opening. It is desirable not to increase the flow rate of the blown air from the air. The fact that the air in the deposition layer flows into the lower end opening means that the air in the deposition layer above the lower end opening falls in the deposition layer, and the air rises in the deposition layer and burns. This is because the function of reaching the chamber and accelerating combustion in the combustion chamber as combustion air in combination with the air from the inside of the feed cylinder 27 is reduced.

  Next, the operation principle of the apparatus of this embodiment as described above will be described.

  First, the raw material M is input into the raw material storage tank 1 from the input port 2 in FIG. Further, the solid fuel S is pumped by the pump 5, passes through the pumping pipe 6, and sequentially falls in a plurality of solid fuel dropping pipes 11 hanging from the circulating part 8, and the last remaining solid fuel is downstream of the radial part 9. It falls in the solid fuel dropping pipe 12 depending from the end side.

  As shown in FIG. 2, the solid fuel S is guided to the connection portion 11 </ b> B at the upper end of the solid fuel dropping pipe 11 by the control plate 15 provided in the circulating portion 8, and when the damper member 14 is opened, the solid fuel S It falls in the fuel dropping pipe 11. In the raw material storage tank 1, a deposition layer of the raw material M is formed on the bottom wall 1 </ b> A, and the solid fuel S in the solid fuel dropping pipe 11 is directly below the lower end opening 11 </ b> A of the solid fuel dropping pipe 11. It is in contact with the raw material M.

  A flange-like resistance plate 13 is provided on the outer peripheral surface on the lower end side of the solid fuel dropping pipe 11, and a space in which no raw material is present is formed immediately below the resistance plate 13. It smoothly flows down to the upper end opening 3A of the raw material supply pipe 3. The raw material M that flows down acts to pull out the solid fuel S from the lower end opening 11A of the solid fuel dropping pipe 11, and the solid fuel S falls at the center line position in the raw material supply pipe 3, and the raw material M becomes this solid. Drops around the fuel flow. In this way, the raw material M and the solid fuel S that fall through the same raw material supply pipe 3 fall on the rotating hearth 19 to form a deposited layer, so that the deposited layer is excellent in the raw material and the solid fuel. It is in a mixed state.

  Fluid fuel is ejected from the burner 23 located in the furnace lid 20, and solid fuel S falls from the solid fuel dropping pipe 12. The fluid fuel and the solid fuel are mixed and burned in a combustion chamber directly under the furnace lid 20. The combustion gas generated by this combustion heats the deposition layer made of the mixture of the raw material M and the solid fuel S on the hearth 19 from its free surface, and a part of this combustion gas forms the deposition layer together with the high temperature rising gas described later. The raw material is heated by burning the solid fuel S in the mixture. Thus, the raw material preheated by being heated on the hearth 19 gradually falls from the free surface of the deposited layer to the furnace body 18 through the drop opening 25 by the action of the pusher 24.

  The preheated raw material M dropped from the drop opening 25 forms a deposition layer again in the furnace body 18. The raw material of the deposited layer gradually descends by taking out the raw material at the discharge port 36A after the completion of the baking, but is sufficiently baked before reaching the discharge port 36A. When the raw material reaches the discharge port by the air sent out from the section and the air rising from the blow-out pipe 41 and the blow-out hole 42 and then rising in the deposition layer, the raw material is sufficiently cooled.

  The air sent out from the window portion of the air supply box 30 and the air blown out from the blow-out pipe 41 and the blow-out hole 42 are heated from the raw material while cooling the raw material while the raw material deposited layer is rising, and the deposited layer Reach on the top surface. The heated air and the air sent upward from the feed cylinder 27 contribute to combustion in the combustion chamber, and are kept in the combustion chamber for a long time by raising the combustion gas in the combustion chamber. Make heating on the free surface of the upper deposited layer effective. The combustion gas that has permeated the deposition layer on the hearth 19 is exhausted from the exhaust pipe 26 as exhaust gas.

  Thus, the fired and cooled raw material is taken out as a product from the discharge port 36A.

  The present invention is not limited to the above-described embodiment shown in the drawings, and various modifications can be made. For example, the solid fuel dropping pipe 11 that hangs from the circulating portion 8 of the pressure feeding pipe 6 is required to smoothly flow in and smoothly drop the solid fuel from the circulating portion 8. For smooth inflow of the solid fuel into the solid fuel dropping pipe 11, for example, it is not a control for restricting the circumference of the pressure feeding pipe as shown in FIG. The damper member may be periodically opened, or air may be blown from the upper wall of the circulating portion toward the upper end opening of the solid fuel dropping pipe 11. In order to smoothly drop the solid fuel in the solid fuel dropping tube 11, the solid fuel dropping tube is a tapered tube whose inner diameter is slightly increased downward, or the solid fuel dropping tube itself is used as a bellows tube. The bellows tube may be vibrated by giving a displacement in the longitudinal direction to a specific location and partially expanding and contracting to prevent clogging in the tube.

  Further, the solid fuel supply pipe hanging from the downstream end side of the pressure feed pipe 6 is connected to a burner for injecting fluid fuel and one injector, and the solid fuel and the fluid fuel are injected in a mixed state by this injector. You may make it do. In this case, as shown in FIG. 4, the fluid fuel L is supplied to the injector 43 from above and the solid fuel S is supplied from the tangential direction, mixed together, and then injected downward, and the injection flow swirls. Can be accompanied by a flow. Furthermore, in that case, in FIG. 4, the inflow directions of the fluid fuel and the solid fuel into the injector may be reversed, that is, the solid fuel may be supplied from above and the fluid fuel may be supplied from the tangential direction.

  Further, in the present invention, the projecting part 11B-1 is not provided in the connecting part 11B at the upper end of the solid fuel dropping pipe 11 in the circulating part, and the control plate 15 and the damper member 14 are not provided. A rotatable damper member having a hinge is provided at the rear edge position of the upper end opening of the pipe, and the damper member is turned sideways to close the upper end opening, and to stand up to open the upper end opening. You may make it rotate between the open positions which show resistance to the flow of the solid fuel in a part. However, when in the open position, the damper member exhibits resistance to the lower layer flow of the solid fuel flowing in the pipe of the circulation part, and flows to the downstream of the circulation part through the upper end opening for the upper layer flow. It is preferable to form a space that allows the above. A predetermined number of damper members of the solid fuel dropping pipes in the circulating portion are sequentially in the open position, and the others are in the closed position. If it carries out like this, solid fuel will fall to each solid fuel fall pipe in which a damper member is an open position one by one. The solid fuel is a mixture of fine and coarse particles, but due to the difference in weight between the two, the fine particles flow in the upper layer flow and the coarse particles flow in the lower layer flow in the circulating portion. Accordingly, the coarse particles flow into the solid fuel dropping pipe in which the damper member is open, and the fine particles reach the solid fuel dropping pipe that does not have the damper member on the downstream end side, and the fine particles always flow in.

1 shows an apparatus according to an embodiment of the present invention, in which (A) is a longitudinal sectional view, and (B) is a plan view showing only a pumping tube. FIG. 2 is a cross-sectional view showing a solid fuel dropping pipe hanging from a circulating portion of the pressure feeding pipe of the apparatus and its periphery. 1 is an enlarged cross-sectional view showing a firing portion and a discharge portion of the apparatus. It is a principle figure of other embodiments which shows an injector which mixes and injects fluid fuel and solid fuel as a fuel supply device of Drawing 1 device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Raw material storage tank 1A Tank bottom 3 Raw material supply pipe 6 Pressure feed pipe 7 Pressure feed upstream part 8 Circulation part 9 Radial direction part 11 Solid fuel fall pipe 11B-1 Protrusion part 12 Solid fuel fall pipe 13 Resistance part 14 Damper member 15 Control board 16 Lid Wall 17 Cylinder Wall 18 Furnace Main Body 19 Furnace 20 Furnace Lid 21 Top Plate 23 Fluid Fuel Supply Port (Burner)
25 Drop opening 43 Injector M Raw material S Solid fuel

Claims (8)

An annular plate-shaped hearth extending in the radial direction with respect to the vertical center line of the furnace main body at the upper part of the vertical furnace main body and having a drop opening formed in the central area in the radial direction. A preheating space is formed by a space surrounded by a cylindrical wall extending upward at the outer peripheral edge position and a lid wall that closes the upper end of the cylindrical wall, and a firing space is formed in the furnace body that hangs down from the inner edge of the drop opening of the hearth. And an annular top plate portion in which the lid wall forms a radially outer region portion and a furnace lid portion that forms a radially inner region portion from the top plate portion, and is located above the lid wall outside the furnace. The raw material storage tank disposed in the tank is connected to the raw material supply port of the top plate through a plurality of raw material supply pipes hanging from the bottom of the tank, and the fuel supply device provided outside the furnace is connected to the fuel supply port of the lid wall In the vertical firing furnace device connected to
The fuel supply device includes a fluid fuel supply device and a solid fuel supply device, the fluid fuel supply device is connected to a fluid fuel supply port formed in a furnace lid portion at the center of the lid wall, and the solid fuel supply device is A solid fuel dropping pipe suspended from the pumping pipe is provided at a plurality of positions in the pumping direction of the pumping pipe extending from the solid fuel supply source, and the solid fuel dropping pipe at the downstream end side in the pumping direction is a solid fuel supply port of the furnace lid portion. The other solid fuel dropping pipes are plunged into the raw material storage tank, and the lower end opening is located above the upper end opening of the corresponding raw material supply pipe in the raw material storage tank. Mold firing furnace device.   The raw material supply pipes are provided at a plurality of positions in the circumferential direction around the vertical center line of the furnace main body, and the pressure feed pipe has a circular portion extending in the circumferential direction above the raw material supply pipe and a radius at the downstream end side of the pressure feed pipe. Inwardly, it has a radial direction part that reaches the solid fuel drop pipe connected to the solid fuel supply port of the furnace lid part, and a pumping upstream part that connects the upstream end of the circulating part and the solid fuel supply source. The vertical firing furnace apparatus according to claim 1, wherein the vertical firing furnace apparatus is provided.   3. The saddle type according to claim 1 or 2, wherein the solid fuel dropping pipe to be plunged into the raw material storage tank has a flange-shaped resistance portion projecting radially outward at a lower end opening or a position immediately above the lower end opening. Firing furnace equipment.   The lower end opening of the solid fuel dropping pipe at the downstream end side in the pumping direction is connected to an injector having a fluid fuel supply port, and the solid fuel and the fluid fuel are mixed and injected into the furnace by the injector. A vertical firing furnace apparatus according to any one of claims 1 to 3.   The vertical firing furnace device according to claim 3, wherein the lower end opening of the solid fuel dropping pipe is opened in a tangential direction with respect to a circumference having the injection direction of the injector as a center line.   The pressure feed pipe has a drop promoting device that provides resistance to the flow of the solid fuel to be pumped at the upper end opening position of the solid fuel drop pipe in the circulation portion and promotes the fall of the solid fuel to the end opening. The vertical firing furnace apparatus according to claim 1 or 2, wherein the vertical firing furnace apparatus is provided.   The fall accelerating device is constituted by a damper member provided at the downstream edge of the upper end opening of each solid fuel dropping pipe in the circulating portion, and the damper member closes the upper end opening in the closed position and in the open position. The damper member is positioned so as to provide resistance to the lower layer flow in the circulation pipe and allow the upper layer flow, and the selected damper member among the damper members is sequentially brought into the open position, and the other damper members are closed. The vertical firing furnace device according to claim 6, wherein the vertical firing furnace device is located.   The vertical furnace according to claim 1, wherein the furnace body has an air blowing device for blowing air received from the outside upward in the furnace body.

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