KR0170050B1 - Vertical furnace - Google Patents

Abstract

The present invention is used vertically in the technical field of producing a product by firing powder, particles, or lump raw material, such as limestone, roadmite, magnesite, or ferret made from various inorganic materials by molding at high temperature It relates to a type kiln, which is provided with a storage device for raw material which is to be fired at an outer upper position of the furnace lid, which is connected to the preheating space of the kiln by the raw material supply pipe so that the raw material can be supplied by dropping, and the storage device and the material supply pipe During the process, an airtight supply mechanism for dropping and supplying the raw materials is provided while preventing air from flowing in from the outside, and air is prevented from leaking into the furnace together with the raw materials.

Description

Vertical kiln

1 is a longitudinal sectional view of a device of Embodiment 1 of the present invention;

FIG. 2 is a longitudinal sectional view showing a modification of the airtight supply mechanism applicable to the FIG. 1 apparatus. FIG.

3 is a longitudinal sectional view showing a modification of the vicinity of the outlet of the main body applicable to the FIG. 1 apparatus.

4 is a longitudinal sectional view of a device of a second embodiment of the present invention;

FIG. 5 is a longitudinal sectional view showing a variation of the flue gas piping of the FIG. 4 apparatus; FIG.

6 is a longitudinal sectional view showing another variation of the flue gas piping of the FIG. 4 apparatus.

7 is a longitudinal sectional view of a third embodiment device of the present invention.

8 is a longitudinal sectional view of a device of a fourth embodiment of the present invention;

9 is a sectional view taken along the line IX-IX of FIG.

* Explanation of symbols for main parts of the drawings

1: low lid 2: inner cylinder

3: outer cylinder portion 6: combustion air supply pipe

7: combustion gas supply pipe 8: furnace body upper floor

8A: Droplet 9: Sealing device

20: outlet 21: combustion chamber

22: preheating space 23: storage device

23A: Upper Storage Device 23B: Lower Storage Device

24: Gibil supply mechanism (rotary valve) 25: Suction device

26: raw material supply pipe 27: combustion gas conductive pipe

28: heat exchanger 30,42,43: solid fuel feeder

61: blocking wall 62: inner space

63: outer space 64: combustion gas conductive pipe

71: chute 81: discharge cylinder

82: narrow drop 83: outlet

85: joint joint 88: air pipe

89: diffuser 90: annular space

91: first pipeline 92: ejector (ejector)

93: 2nd corridor 94: Protector

The present invention is used in the technical field of producing a product by firing powder particles or powder mass raw materials (hereinafter referred to as raw materials) such as ferrets made by mixing and molding minerals such as petrite roadmite and magnesite or various inorganic materials at high temperature. It relates to a vertical furnace.

It is known that conventional vertical firing furnaces are published in Japanese Patent Office (Soku 58-32307). This known kiln is provided with a circular plate-shaped rotary main body bottom rotating around the cone axis under the furnace lid to feed the raw material to be fired from the outside. Dropping and supplying to the preheating space on the bottom of the upper body to form the primary deposition layer of the raw material.

The primary sedimentation layer is formed with an angle of repose between the upper free surface on the side of the raw material supply pipe and the lower free surface in contact with the combustion chamber. Radiating heat and the primary deposition layer from the high-temperature flame combustion gas of the combustion chamber facing the lower free surface of the primary deposition layer facing the combustion chamber formed at the central space of the upper part of the rotary furnace body directly under the furnace lid. A plurality of pushers disposed around the furnace by heating the raw material by convection heat from the combustion gas flowing through the gas in the direction and flowing out to the upper free surface to achieve plasticity (sinter firing) of about 50 to 60%. In the lower space of the cylindrical main body provided to drop the semi-baked material from the dropping hole formed in the center of the upper part of the upper part of the rotary body to extend downwardly to the upper part of the main body. Secondary deposition layer of a baking raw material is formed and complete baking is performed here.

A diffuser and an ejector are disposed in the center of the main body.

The diffuser has a vertical cylindrical shape and is formed with a penetrating conical air blowing hole having a diameter extending upward. An ejector for ejecting combustion air from the outside is provided in the lower opening of the diffuser.

The secondary deposited layer of semi-baked raw material that has fallen from the upper body bottom to the main body is formed in the outer circumference of the diffuser and reaches near the upper end of the diffuser.

The secondary deposition layer is formed while securing an angle of repose with the upper free surface touching the combustion chamber at the upper outer circumference of the diffuser and the lower free surface around the ejector inside the lower end of the diffuser.

That is, according to the diffuser and the ejector, when the air is ejected from the ejector toward the vents of the diffuser, the area of the lower free surface formed at the periphery of the ejector of the secondary deposition layer formed around the diffuser becomes low pressure. A part of the combustion gas in the combustion chamber is drawn in the secondary deposition layer from the upper free surface of the secondary deposition layer formed at the upper outer circumference of the diffuser and flows toward the lower free surface.

Therefore, the secondary deposited layer is completely burned by the flowing combustion gas to be a product.

The product is discharged by falling from the outlet of the bottom of the main body, but then cooled by the air flowing into the main body from the outlet and the air flowing through the ejector.

Nevertheless, in the above-described conventional kiln, when air is supplied by dropping raw materials through the supply pipe toward the surface of the primary deposition layer on the upper floor of the main body, a lot of air is introduced into the furnace from the outside together with the resulting air. Is injected into the primary sedimentation layer of the upper body bottom of the furnace body and mixed with the combustion gas discharged to the outside after outflow from the upper free surface of the primary sedimentation layer.

When it is required to discharge carbon dioxide gas, which is this combustion gas generated at the time of firing, at a high concentration, the above-mentioned air mixture lowers the concentration of this carbon dioxide gas, which is not good condition.

In addition, in the case where the concentration of the carbon dioxide gas discharged above may be low, in order to control the temperature of the combustion chamber downward, combustion may be performed using a large number of intake air.

When fuel is burned using such a large amount of excess air, the temperature of the combustion gas discharged upward through the primary deposition layer on the bottom of the top of the furnace body of the kiln increases and the resulting combustion gas is taken out. The amount of heat energy exhaled increases, so that an unfavorable condition occurs that the resin of the fuel heat source unit (heat amount required to fire a unit amount of raw material) for raw material firing increases.

In the known kiln, a powder such as petroleum coke, powdered coal, plastic crushed fragments, etc., which contains gas or fluid-shaped fuel supplied from the fuel supply pipe to the combustion chamber for combustion. Particulate, flammable combustibles cannot be used.

In particular, if it is possible to use the shredded pieces as fuel as a managed waste as fuel, the fuel cost will be greatly reduced at the same time as environmental conservation, but the advantage cannot be utilized.

In other words, in the known kiln, a diffuser and an ejector are used to more efficiently fire the semi-baked raw material in the secondary deposition, but when the air for combustion from the outside is ejected from the ejector, Since the pressure in the lower free surface area of the surrounding secondary sediment is lowered, the air flowing into the main body from the outlet of the product flows toward the lower free surface and burns from the upper free surface of the secondary deposited layer toward the combustion chamber. The gas inflow is reduced and the firing effect cannot be expected naturally.

The present invention solves this problem and prevents the inflow of air from the outside through the raw material supply pipe, and the vertical type that can control the temperature in the combustion chamber and control the concentration of carbon dioxide to release even more without using excessive air for combustion. The first object is to provide a firing material.

A second object is to make it possible to use combustibles in the form of powders and lumps, including solid waste as fuel.

Thus, the heat efficiency of the exhaust gas is used to improve the thermal efficiency in the combustion chamber and to actively induce the circulation of the combustion gas in the secondary deposition layer fired in the furnace body to improve the plasticity and consequently to improve the thermal efficiency. It is doing the third purpose.

Further, the fourth object is to make the distribution of the raw material particle size of the primary deposited layer uniform, and to evenly circulate the combustion gas in the primary and secondary deposited layers.

According to the present invention, the first object of the present invention is an annular upper body bottom bottom in which a drop opening of a raw material is formed in the center part by rotating around a cone axis and a lower lid arranged in an upper position of the upper body bottom bottom. The outer lid has a large outer diameter from the dropping port and is provided with an inner cylinder portion continuously connected to the furnace lid and an outer cylinder portion connected to the inner cylinder portion at an upper portion thereof, and the outer cylinder portion is extended downward from the inner cylinder portion. A fuel supply port for supplying fuel from the outside is installed in the combustion chamber which extends and is formed directly under the furnace lid, and an airtight seal device is installed between the upper end of the main body of the furnace body and the lower end of the outer cylinder part so that the main body is installed. Allows relative rotation with respect to the furnace lid of the top bottom, and connects the inner cylinder part and the outer cylinder part from the top and the upper body bottom In the annular preheating space formed by enclosing, a raw material supply pipe for dropping and supplying raw materials from the outside to the preheating space is installed, and the preheating space is opened radially inward to communicate with the combustion chamber and is formed at the center of the upper body bottom floor. In the edge portion of the drop opening, a longitudinal cylindrical body is installed to extend downward, and the raw material in the preheating space is dropped from the side of the combustion chamber, and the raw material is dropped from the drop opening and fired in the furnace body. In a vertical furnace in which a discharge port for discharging waste into a product is formed in the lower part of the main body, a storage device for raw material to be fired is installed at an outer upward position of the furnace lid, and the storage device is preheated by the raw material supply pipe. Connected to allow the supply and drop of raw materials, This is achieved by providing an airtight supply mechanism between the teeth and the raw material supply pipe for dropping the raw material while preventing air from flowing from the outside.

In this case, the airtight supply mechanism is preferably a rotary valve.

At that time, the storage device may be divided into upper and lower rotary valves.

In order to more effectively control the carbon dioxide concentration emitted by the temperature control in the combustion chamber, the upper part of the preheating space and the combustion chamber are connected to the combustion gas conduction pipe so that a part of the combustion gas exhausted upward through the raw material in the preheating space. Either a return path back to the combustion chamber or an upper space of the preheating space is divided into an inner space and an outer space by a cylindrical barrier wall extending downward between the inner cylinder and the outer cylinder to an intermediate position of the preheating space. The raw material supply pipe is connected to one of the inner space and the outer space so that the combustion gas conductive pipe is connected to the other space.

Next, it is achieved because the solid fuel supply port into which the solid combustibles can be injected into the combustion chamber or the combustion gas supply pipe for the second purpose of the present invention is in communication.

In addition, a third purpose is to connect the combustion air supply pipe that receives the air for combustion from the outside to the combustion chamber, and the combustion air supply pipe is connected to the combustion chamber through a heat exchanger in which the air in the tube exchanges heat with the combustion gas in the combustion gas conduction pipe. An air blower is formed or connected to the main body and extends in the longitudinal direction in a longitudinal direction and penetrates a wide diameter upwardly. The cylindrical diffuser supported by the main body and the lower end of the air blower of the diffuser Equipped with a rotary joint rotatably in an airtight state with an ejector close to the opening, the ejector for ejecting combustion air received from the outside to the air blowing hole upwards, and the air blowing tube for sending the combustion air from the outside. Annular hole communicating in the circumferential direction in the cylindrical wall of the diffuser Is formed and the rotary joint is achieved by the interior space being connected by part of the annular space of the diffuser with the first conduit and connected with the other part of the annular space by the lower part of the diffuser and by the second conduit. It is done.

At this time, a discharge cylinder having a narrow drop path, which is narrower than the space area by the cross section of the main body above the joint position between the rotational joint position in the main body and the discharge port in the lower part of the main body, is provided in the furnace main body. It is more effective to be equipped to allow the rotation of the main body in the air-tight state.

In addition, a fourth object is to store the raw material falling from the hermetic supply mechanism in which the storage device has a rotary chute that rotates around the longitudinal axis in the downward direction of the hermetic supply mechanism and the inlet side of the rotary chute is arranged on the longitudinal axis. This is achieved by being arranged at the receiving position and having an outlet width at least extending radially outwardly from the longitudinal axis.

At this time, if the storage device is equipped with a suction device for sucking the air in and out of the storage device having the airtight supply mechanism disposed downward, even if some air leaks into the airtight supply mechanism when the raw material is supplied. It can be improved by sucking the introduced air to the outside.

Thus, in the present invention, when the raw material is supplied from the storage device to the preheating space through the raw material supply pipe, the raw material falls through the airtight supply mechanism, thereby preventing the inflow of air from the outside.

The winry, which was introduced into the preheating space and dropped to the upper floor of the main body, forms the primary deposition layer in this preheating space, and the radiant heat from the flame and combustion gas or the primary deposition layer flows upward from the lower free surface in the combustion chamber. Convection annihilation of the combustion gases passing through the free surface results in a semi-firing state.

The semi-baked raw material falls into the main body from the drop opening at the top of the main body by the action of a pusher, and forms a secondary deposition layer in the main body, where it is completely fired and cooled by heat exchange with the combustion air supplied from below. It is discharged by the lower outlet as a product.

When using solid combustibles as fuel, solid combustibles are introduced from the solid fuel supply port.

When controlling the temperature in the combustion chamber or controlling the concentration of the emitted carbon dioxide, part of the combustion gas to be exhausted from the preheating space is returned to the combustion chamber.

In order to raise the temperature of combustion air received from the outside using the heat of combustion gas, it heats by heat exchange with combustion gas by a heat exchanger.

In the case where the diffuser and the ejector are installed in the furnace body, air from the outside supplied to the rotary joint is heated in the annular space in the diffuser and then ejected toward the combustion chamber by the ejector.

In the case of installing a discharge cylinder that forms a narrow drop path, the secondary deposition layer in the main body exhibits a lot of resistance to the air to be introduced from the discharge port through the space between the particles of raw material, so that the combustion gas from the combustion chamber is the secondary deposition layer. The inflow into the layer from the upper free surface of the can be effectively performed.

When the rotary chute is installed under the airtight feed mechanism, the raw material is uniformly deposited in the circumferential direction, and the raw material is uniformly fired.

Example 1

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, the inner cylinder part 2 is connected and installed in the outer periphery of the furnace lid 1 which consists of heat-resistant materials, and the outer cylinder part 3 is provided in the outer side of this inner cylinder part 2. As shown in FIG.

The inner cylinder part 2 and the outer cylinder part 3 are connected by the connection part 4 in the upper part, and the outer cylinder part 3 extends downward rather than the inner cylinder part 2.

The burner 5 which sends fuel of a gas or a liquid from the outside was installed in the center part of the said furnace lid 1, The combustion air supply pipe 6 and the combustion gas return path which are mentioned later are around this burner 5 A combustion gas supply pipe 7 is provided.

In the lower direction of the furnace lid (1) is rotatably provided in the round body-shaped upper body bottom 8 made of a heat-resistant material.

This main body upper floor 8 is rotated by the external drive which is not shown in figure.

A sealing device 9, for example, a well-known water seal, is provided between the edge of the main body upper end 8 and the lower edge of the outer cylinder part 3, for example, a known water seal. (9) permits airtightness to be maintained relative to the outside and rotation of the upper body bottom floor (8). A drop opening 8A is formed in the center of the upper body bottom 8, and a vertical cylindrical body 10 is connected to the bottom of the drop opening 8A in a downward direction.

The diffuser 12 is provided in the upper position in the said main body 10 by the support part 11 provided in this main body 10. As shown in FIG. The diffuser 12 is formed with a penetrating air blowing hole 13 whose diameter is enlarged in a vertical cylindrical shape upward.

The ejector 14 is disposed in the lower opening of the diffuser 12 as it is combined.

This ejector 14 is connected to the heat exchanger 16 supported by the support part 15 of the main body 10.

The lower part of the ejector 14 is out of the furnace and is in communication with the delivery pipe 17 by a rotary joint 18 allowing relative rotation with the delivery pipe 17 which sends air from the outside.

A bottom plate 19 through which the lower part of the ejector 14 penetrates is installed at the bottom of the main body 10, and a discharge port is provided between the bottom plate 19 and the bottom edge of the main body 10. 20 is formed.

A combustion chamber 21 is formed directly below the furnace lid 1 to surround the inner cylinder part 2, the outer cylinder part 3, and the connection part 4, so that a round shape is formed by the upper body bottom 8 of the main body. The preheating space 22 is formed and this preheating space 22 is open toward the combustion chamber 21 in the radially inward direction thereof.

In the preheating space 22, a rod-shaped pusher 22A penetrates through the outer cylinder portion 3 from the outside, so as to reciprocate appropriately in the radially inner direction of the furnace (longer direction of the rod).

In the upper position of the furnace lid 1, a storage device (23) for storing a raw material to be fired, for example, a pellet prepared by mixing and molding various minerals such as limestone, road mite, magnesite, etc. ) Is excreted.

In the present embodiment, the storage device 23 holds the upper storage device 23A and the lower storage device 23B, both of which are connected as a rotary valve 24 which is an airtight supply mechanism.

At the upper portion of the lower storage device 23B, a suction device 25 such as a blower is used to boil the air pressure in the lower storage device 23B with the pressure of the upper space of the preheating space 22. The rotary valve 24 is divided into four spaces in the present embodiment, so that the raw material S from the upper storage device 23A and the lower storage device 23B at the upper position due to the rotation of the rotary valve 24. ) And the lower storage device (23B) is blocked from the outside air in this way.

The connection part 4 forming the upper wall of the preheating space 22 includes a plurality of raw material supply pipes 26 and preheating space 22 for drop-feeding raw materials from the lower storage device 23B into the preheating space 22. The combustion gas induction pipe 27 which extracts combustion gas from the upper part is connected.

The combustion air supply pipe 6 connected to the furnace lid 1 receives air from the outside by the blower 29 through the heat exchanger 28 and supplies it to the combustion chamber 21.

In addition, the combustion air supply pipe 6 is provided with a solid fuel supply port 30 that allows combustibles such as powder, granules, and pieces to be supplied to the combustion chamber 21 as well as suitable air.

The combustion gas conduction pipe 27 is connected to the blow 32 through the heat exchanger 28 and the dust collector 31 so that the combustion gas discharged from the preheating space 22 is sucked in the blow 29. Is heated up in the heat exchanger 28, and after the combustion gas itself is cooled down, the dust is separated by the dust collector 31 and exhausted to the outside.

In the combustion gas conductive pipe 27, a pipe is divided between the heat exchanger 28 and the dust collector 31, and a part of the lowered combustion gas is discharged by the blow 33.

The pipe is divided again at the downstream position from the brow 33 so that one branch pipe 34 joins the combustion air supply pipe 6 through the valve 35 and the other branch pipe 36 opens the valve 37. Via the combustion gas supply pipe (7), it is connected to the furnace lid (1).

In this Example apparatus of such a structure, a raw material is baked by the following method.

(One). As the rotary valve 24 prevents the inflow of air from the outside, the raw material falls from the upper storage device 23A and is stored in the lower storage device 23B.

(2). Some air may leak into the lower storage device 23B between the rotary blades of the rotary valve 24 and the gap between the fixed outer cylinder. In this case, the lower storage device 23B is provided by a suction device 25 such as blow. Aspiration is carried out so that the air in it is equal to the pressure in the upper space of the preheating space 22.

At this time, when a part of the combustion gas flows into the lower storage device 23B from the preheating space 22, the combustion gas is sucked to the outside like the air in the lower storage device 23B.

(3). The raw material in the lower storage device 23B falls through the raw material supply pipe 26 to form a primary deposition layer of the raw material on the upper body bottom 8 where the preheating space 22 forms the bottom.

This primary deposition layer secures an angle of repose and forms an upper free surface 38 on the raw material supply pipe 26 side, and thus a lower free surface 39 on the combustion chamber 21 side.

(4). The fuel ejected from the burner (5) is burned in the combustion chamber (21) by an air flow sent through the combustion air supply pipe (6) to the vicinity of the burner (5), and radiated to radiant heat from flame combustion gas. The lower free surface 39 of the primary stacked layer is thereby heated. The combustion gas penetrates through the lower free surface 39 of the primary deposition layer from the combustion chamber 21, flows through the interior of the primary deposition layer, and heats the raw material in the primary deposition layer by convective heat transfer. In this way, the raw material near the lower free surface 39 is semi-baked.

(5). A plurality of pushers 22A, which are guided to the outer cylinder part 3 and reciprocally moved in the radial direction of the furnace, are installed around the outer cylinder part 3 so that the semi-baked raw material of the primary deposited layer is lower than the free surface 39 It pushes toward 8 A of fall openings from the lower part of), and falls. The upper body bottom 8 rotates around the conical center axis and with this the first sedimentary layer on the upper body bottom 8 also rotates, but the pusher 22A is supported by the outer cylinder part 3 fixed in the space and is circumferential. The pusher 22A is pushed out relatively evenly in the circumferential direction because it does not move in the direction but reciprocates only in the radial direction.

The semi-baked raw material heated and fired in the primary deposition layer on the rotating upper body bottom 8 is pushed down by a pusher 22A to form a drop opening in the center of the upper bottom of the main body from the lower free surface 39 side. It falls by 8A), and forms a secondary deposition layer in the main body 10. As shown in FIG.

Since the diffuser 12 is installed at the center of the main body 10, the secondary deposition layer in the main body 10 is formed in an annular shape around the diffuser 12, and thus, near the upper end of the diffuser 12. An upper free surface 40 is formed around the outer side, and a lower free surface 41 is formed around the ejector at the lower end side of the diffuser 12.

Since the main body 10 is integrally connected to the main body upper floor 8 to be rotated, the main body 10 rotates like the main body upper floor 8.

(6). The externally pressurized air reaches the heat exchanger 16 via a rotary joint 18 where it is heated by heat from the secondary deposition in the surrounding body 10 to dissipate the diffuser 12 from the ejector 14. Eject upward upwards.

The pressure of the region of the lower free surface 41 formed around by the high-speed jet of air from the ejector 14 decreases the pressure, so that a part of the hot combustion gas in the combustion chamber 21 is free of the upper surface of the secondary stacked layer 40. V) flows vigorously through the inside of the secondary stacked layer from the direction of the free surface 41 toward the lower free surface 41 to effectively complete the subsequent firing of the semi-baked raw material. Moreover, the type, size, and quantity of the heat exchanger 16 are arbitrary. In addition, there is no difference without using a heat exchanger.

(7). The calcined raw material of the secondary deposition layer in the main body 10 is discharged as a product from the outlet 20, but then air flowing into the main body 10 through the particles of the raw material from the outlet 20 and the heat exchanger It is discharged outward from the said outlet 20 by the action of the relative rotation between the bottom plate 19 and the main body 10 which were cooled by 16 and fixed to low temperature.

In this case, the discharge mechanism is not limited to the one shown in FIG. 1 but is arbitrary.

(8). In this embodiment, the combustion gas whose temperature is lowered by heating the raw material by flowing upward through the primary deposition layer of the raw material formed in the preheating space 22 is fed to the heat exchanger 28 through the combustion gas conductive pipe 27. do.

On the other hand, the combustion air blown in from the outside by the air blow 29 is supplied to the heat exchanger 28, heat exchanged with the combustion gas, preheated, and then burner 5 through the combustion air supply pipe 6. It is ejected near the tip and burns fuel.

(9). The combustion gas whose temperature is lowered through the heat exchanger 28 is discharged to the atmosphere through the blow 32 in a state where dust is removed from the dust collector 31 and cleaned.

A part of the combustion gas is fed back into the combustion chamber 21 by the action of the blow 33. At this time, the combustion gas delivery method is not limited to the first degree, and the positional form, size, and number are arbitrary.

Combustion gas is mixed with air in the combustion air supply pipe 6 to the combustion chamber 21 by locking the valve 37 and opening the valve 35 without limiting the separate delivery to the combustion air as described above. You may feed.

In this way, a part of the combustion gas is returned to the combustion chamber 21, so that the concentration of carbon dioxide discharged to the outside can be controlled.

In other words, the carbon dioxide concentration in the combustion chamber 21 can be controlled to a predetermined value to improve the firing of the raw materials.

(10). Solid fuel supply port installed in the furnace lid (1) when used as a fuel for powder, small particles, and flammable solid combustibles such as petroleum coke, powdered coal, plastic crushed fragments and vegetable crushed fragments containing coarse particles ( 42) From the solid fuel supply port (30) installed in the combustion air supply pipe (6), and from any or all of the solid fuel supply port (43) installed downstream of the blow 33, the powder, small particles, pieces Solid combustibles are fed.

The location, size, and quantity of solid fuel inlets are arbitrary.

The airtight supply mechanism disposed between the upper storage device 23A and the lower storage device 23B in the FIG. 1 apparatus is not necessarily limited to the rotary valve shown in the drawing, but the three-stage dump 50 shown in FIG. It is also possible. 2 shows the principle of a three-stage dump, in which three gate plates 51, 52, 53 are provided in a passage connecting the upper storage device 23A and the lower storage device 23B. When the gate plate 52 is blocked from the state and the gate plate 53 is opened, a certain amount of raw material falls into the lower storage device 23B in a state in which air is sealed, even if it is blocked by the gate plate 53 in FIG. .

In the case of supplying such raw materials, the type size and quantity are arbitrary.

In addition, discharge of the finished plastic product from the discharge port 20 is not limited to the form of FIG. For example, as shown in FIG. 3, a discharge rod 54 that does not rotate is installed in the outlet 20 so that the product falls from the outlet 20 by the relative rotation between the main body 10 and the bottom plate 19. Can promote. In this case, the sealing apparatus of the various methods which can prevent the inflow of air from between the discharge chute 55 and the main body 10 can be provided, and the air intrusion from the discharge port 20 can also be prevented effectively.

Example 2

In FIG. 4, a cylindrical barrier wall 61 extending downward to the middle is provided between the inner cylinder portion 2 and the outer cylinder portion 3, which form the primary stacked layer of the raw material, on the upper end of the main body. The upper portion of the preheating space is divided into an inner space 62 and an outer space 63, and the upper portion of the deposition layer is divided into two portions existing in the inner space 62 and the outer space 63 to feed the raw material supply pipe 26. Combustion gas discharged from the portion close to the bottom of the exhaust gas is discharged out of the furnace via the conductive pipe (64). The remaining combustion gas is collected at the combustion gas conduction pipe 65 connected to the inner space 62 as it is at a high temperature, and fed back into the combustion chamber 21 by the action of a gentle blow 66. At this time, the solid fuel supply ports 30, 42, 43 are the same as in the first embodiment.

The high temperature combustion gas collected in the combustion gas conduction pipe 65 in FIG. 4 is not necessarily drawn into the blow 66 as it is, but the temperature of the combustion gas itself through the heat exchanger 67 as in FIG. It is also possible to feed into the combustion chamber 21 by the action of the circulation blow 68 after the lowering of the temperature.

In this way, the air in the combustion air supply pipe 6, which is sent by the circulation blow 29, is preheated to burn up the fuel with high thermal efficiency.

In addition, the valve 37 is closed, the valve 35 is opened, and a part of the combustion gas can be mixed with the combustion air and fed into the combustion chamber 21.

The valve 69 in FIG. 5 is for adjusting to distribute the combustion gas to two combustion gas conductive pipes. That is, when the valve 69 is adjusted in the closing direction, the amount flowing into the combustion conductive tube 64 is reduced, and the amount entering the combustion conductive tube 65 toward the heat exchanger 67 is increased.

The method of installing the barrier wall 61 for dividing the upper region of the primary deposition layer of the raw material on the upper body bottom into two parts in an annular manner is not necessarily limited to that shown in FIGS. Even if the raw material supply pipe 26 is provided in the position attached to the inner cylinder part 2, it does not interfere.

Example 3

The storage of raw materials is shown in FIG. 1 and is not stable.

For example, as shown in FIG. 7, the upper portion of the lower storage device 23B, with the rotary valve 24 provided between the upper storage device 23A and the lower storage device 23B, as shown in FIG. A suction device 25, such as a blower, is provided in the present embodiment. In this embodiment, a rotary chute 71 is provided just below the rotary valve 24.

The rotary chute 71 has a receiving portion 72, a chute 73, and a motor 74 and receives the raw material falling from the rotary valve 24 as a receiving portion 72 to receive the raw material. Drop from the bottom of). The motor 74 is attached to the center post 75 and rotates the chute 73 connected to the receiving part 72. The raw material falling from the rotating chute 73 is uniformly deposited in the circumferential direction in the lower storage device 23B. The raw material may be unevenly distributed in the upper storage device 23A, and according to this embodiment, since the raw material is uniformly deposited in the circumferential direction in the lower storage device 23B, the raw material is passed through the raw material supply pipe 76. The raw material falling to the top bottom 8 also forms a uniform primary deposition layer in the circumferential direction in the preheating space 22, and as a result, the semi-baking is also uniform.

Example 4

The following diffusers, ejectors and their surroundings are not limited to those shown in FIG. 1 but may be modified as in the present embodiment shown in FIG.

In this embodiment, the discharge cylinder 81 is provided directly below the main body 10.

The discharge cylinder 81 is for discharging the cooled product after firing, and it is not particularly necessary to manufacture the heat-resistant material.

As shown in Fig. 9, the discharge cylinder 81 is provided with narrow drop paths 82 at four locations in the circumferential direction. As shown in the drawing, these narrow drop paths 82 are opened in the radial direction and communicate with the discharge port 83.

The discharge cylinder 81 does not rotate and allows relative rotation with the main body 10 by means of a sealing device 84 such as a water seal between the main body 10 and the main body 10.

The rotary joint 85 is supported by the support part 86 of the main body 10 at the upper position of the discharge cylinder 81.

The rotary joint 85 becomes a closed cylindrical body shape so that the air supply pipe 88, which blows air from the outside by the blow 87, permits the rotation of the rotary joint 85 in a sealed state. ) Is entered inside.

The diffuser 89 has a shape almost similar to that of FIG. 1, but has an annular space 90 formed therein at a lower portion thereof, so that a part of the annular space 90 and the side portion of the rotary joint 85 and the first bureau are provided. It is connected by 91 and is in communication.

The ejector 92 is vertically installed upward in the rotary joint 85.

The ejector 92 is connected to and communicated with another part of the annular space 90 by the second bureau 93.

The diffuser 89 is provided with a cylindrical air blowing hole 93 having a wide upper portion and a narrow lower portion thereof. However, the air blowing hole 93 has a cone-shaped protective tube 94 made of a heat-resistant metal plate which almost matches the inclined surface of the cylinder. ) Is inserted to be pulled out freely from the top.

In addition, the motor 95 is installed in the central space of the discharge cylinder 81 and rotates the wing body 96 extending radially outward while being gently bent. This wing body 96 rotates approaching the bottom surface of this boat body 81.

Thus, in this embodiment, the air blown by the blow 87 is heat exchanged with the fired raw material around the first tube 91, annular space 90, the second pipe 93 It heats up, it heats up, it ejects from the ejector 92 in a high temperature state, and effective utilization of heat is attained. In addition, since the heat exchange is performed in the downward position by the region where the raw material is sufficiently fired, there is an effect of promoting the cooling of the discharged product.

In addition, in the discharge cylinder 81, the combustion gas in the combustion chamber is narrower than the internal resistance when the combustion gas in the combustion chamber flows into the secondary deposited layer from the upper free surface 97 of the secondary stacked layer so as to pass the narrow path 82 of discharge of the product. The internal resistance in the fall path 82 becomes large.

Therefore, the combustion gas flowing into the secondary deposition layer from the upper free surface 97 actively forms a circulating flow flowing through the lower free surface 98 near the ejection port of the ejector 92, thereby firing the upper portion of the secondary deposition layer. At the same time, the air inflow from the discharge port 83 is suppressed very little.

Further, even if dust is attached to the protective tube 94, the deposit is simply torn off due to the difference in thermal expansion rate with the diffuser 89, and the protective tube 94 is pulled upward and cleaned even if the deposit remains slightly.

It is squared and the shape and surface of the air blower hole of the diffuser 89 have a steady state, and maintain the function of the diffuser.

If the firing furnace is equipped with an airtight supply mechanism of the first embodiment device equipped with a discharge control having a narrow drop path at a lower position of the diffuser and the ejector, the raw material is supplied from both the supply side and the product discharge side. The leakage of external air can be prevented, the concentration of carbon dioxide exhausted can be increased, and the thermal efficiency of the diffuser can be increased.

As described above, the present invention can prevent the inflow of air from the outside and it is not necessary to supply a large amount of excess air to control the temperature of the firing chamber, thereby lowering the temperature of the combustion gas discharged from the firing furnace and thus the fuel heat source. At the same time, it is possible to increase the concentration of carbon dioxide in the combustion gas. In addition, the powder, particles, and flammable combustibles including solid waste can be used as effective fuels, thereby significantly reducing the fuel cost.

And the use of a protective tube allows the diffuser to maintain its normal function.

Claims (12)

The furnace lid 1 is fixedly installed above the upper bottom 8 of the furnace body 10, and the inner cylinder part 2 and the outer cylinder part 3 are protruded around the lid 1, thereby preheating the space 22. A fuel supply port is installed in the combustion chamber 21 directly below the furnace lid, and a seal device 9 is provided between the lower end of the outer cylinder part 3 and the upper bottom 8 of the main body to allow rotation of the main body 10. In the preheating space 22, the raw material supply pipe 26 is installed, and the raw material to be fired at the outer upper position of the furnace lid 1 in the vertical firing furnace in which the product outlet 20 is formed below the main body 10. A device 23 is provided, and the storage device 23 is connected to the preheating space 22 by the raw material supply pipe 26 so as to drop-feed the raw material, and the storage device 23 and the raw material supply pipe 26 are connected to each other. The airtight supply mechanism 24 is installed so that the supply of raw materials falls and prevents the inflow of air from the outside. Vertical kiln, characterized in that. The vertical kiln according to claim 1, wherein the airtight supply mechanism (24) is a rotary valve. The storage device (23) according to claim 1 or 2, wherein the storage device (23) has an upper storage device (23A) and a lower storage device (23B), and the airtight supply mechanism (24) has the upper storage device (23) and the lower storage device. Vertical kilns installed between the devices 23B. The upper part of the preheating space 22 and the combustion chamber 21 are connected by the combustion gas conductive pipe 27, and a part of the combustion gas which flows through the raw material in the preheating space 22 and is exhausted upwards is A vertical type firing furnace having a return path returnable to the combustion chamber 21. 5. The cylindrical barrier wall (61) according to claim 4, wherein the upper space of the preheating space (22) is lowered to the intermediate position of the preheating space (22) between the inner cylinder portion (2) and the outer cylinder portion (3). It is divided into an inner space 62 and an outer space 63, and the raw material supply pipe 26 is in contact with one of the inner space 62 and the outer space 63, and the combustion gas conductive pipes 64 and 65 are connected to the other side. Vertical firing furnace which assumed. 6. The combustion air supply pipe (6) according to claim 4 or 5, wherein a combustion air supply pipe (6) receiving air for combustion from the outside is connected to the combustion chamber (21), and the combustion air supply pipe (6) is a combustion gas conduction pipe (65). A vertical kiln, wherein the furnace is connected to the combustion chamber via a heat exchanger 67 that exchanges heat with the combustion gas therein. The vertical kiln according to claim 1 or 4, wherein the combustion chamber (21) or the combustion gas supply pipe (7) is provided with a solid fuel supply port (43) capable of supplying solid combustibles to the combustion chamber. 4. The storage device (23) according to claim 1 or 3, wherein the storage device (23) has a rotary chute (71) which rotates about the longitudinal axis below the airtight supply mechanism (24), and the inlet side of the rotary chute (71) is A vertical firing furnace, wherein a side which is disposed at a position receiving a raw material falling from an airtight supply mechanism 24 arranged on a longitudinal axis is provided at a position extending radially outward from at least the longitudinal axis. The storage device (23) according to claim 1 or 2, wherein the storage device (23) is disposed below the airtight supply mechanism (24), and is provided with a suction device (25) for sucking air in the storage device (23) toward the outside. Vertical firing furnace which there is. 2. The cylindrical diffuser 89 and the diffuser of claim 1, wherein an air blowing hole is formed in the main body 10 and extends in a longitudinal direction and penetrates a wide diameter upwardly and is supported by the main body. A blower port is located near the bottom opening of the air blowing hole of (89) to eject the combustion air received from the outside upwards to the air blowing hole, and an air blowing pipe for blowing the combustion air from the outside. An annular space 90 is formed in the cylindrical wall of the diffuser 89 so as to communicate in the circumferential direction by installing a rotary joint 85 which is rotatable with respect to the airtight state. A vertical kiln in which the inner space is connected to the other part of the annular space (90) of the diffuser (89) and the lower part of the ejector (92) by a second conduit (93). 11. The vertical firing furnace according to claim 10, wherein the air blowing hole of the diffuser (89) has an inner diameter that extends in the upward direction and is provided with a protective tube (94) made of a heat-resistant metal plate in contact with the air blowing hole. . The lower part of the main body 10 is smaller than the area of the space by the cross section of the main body 10 between the rotational joint 85 position in the main body 10 and the discharge port 83. And a discharge cylinder (81) having a narrow narrow drop path (82) so as to allow rotation of the main body (10) in an airtight state with respect to the main body (10).