JP2005155982A - Combustion furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion furnace capable of reducing the size of a furnace body by eliminating a grate, improving combustor efficiency by uniformly supplying forced air to a combustion object in the furnace body using an inexpensive and simple device, and significantly reducing the dioxines of exhaust gas by improving the combustor efficiency in a secondary combustion chamber. <P>SOLUTION: A lot of straight protrusion and recess shapes 3, 3 facing in the direction of a front door are formed on the bottom part of the combustion furnace 1 into which the combustion object D is thrown. An air blowing off body 4 projected upward is provided on the bottom part of the combustion furnace 1. A lot of air blowing off holes 5, 5 having an interior space and turned radially are formed on the outer periphery of the air blowing off body 4. Furthermore, an air supply pipe 19 from a blower 6 provided on the outer side of the combustion furnace 1 is connected to the interior space of the air blowing off body 4. The forced air supplied from the blower 6 is radially injected from a lot of air blowing off holes 5, 5 of the air blowing off body 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a combustion furnace in which combustion efficiency is improved by forcibly supplying air into the furnace body of the combustion furnace and combustion efficiency in a secondary combustion chamber is improved.

  Recently, the Act on Special Measures against Dioxins (Law No. 105 of 1999) was enacted in order to prevent and eliminate environmental pollution caused by dioxins generated when incinerating waste. In addition, dioxin emission standards for small combustion furnaces (incineration capacity 50 to 200 kg / h) have been established.

  In order to adapt to such legal regulations and respond to environmental problems, conventionally, measures have been taken to improve the combustion efficiency per hour of the incinerated products put into the combustion furnace. Therefore, conventionally, a method of providing one or a plurality of air holes from the outer back surface or side surface of the furnace body to the side wall of the furnace body, or providing a plurality of air holes on the side wall of the furnace body, through the air holes, by forced ventilation A method of sending air into the furnace is used. However, in such a method, since a plurality of air holes are provided in the furnace body, there is a problem that the number of processing steps increases and a considerable cost is required.

  Further, when one air hole is provided in the side wall and a blower is connected to the air hole and forced air is blown, the supplied air is jetted into the furnace body in a fixed direction through the air hole. However, air cannot be uniformly supplied to the combusted material on the rooster, which causes a problem that the combustion speed becomes slow and a part of the combusted material remains unburned at a place where the supplied air does not hit. is there.

  Further, when the invention of Patent Document 1 is raised as a conventional technique, the waste incinerator of this invention is, as shown in FIG. 7, the bottom of a vertical incineration cylinder 53 having a dust inlet 51 and a chimney 52 at the top. The air supply cylinder 55 is installed in the incineration cylinder 53 so that the air supply cylinder 55 is erected, and the blower 57 is connected to the base end of the air supply cylinder 55 so that the tip of the air supply cylinder 55 is connected to the tip of the air supply cylinder 55. A large number of blow holes 56 are formed on the peripheral wall of the air supply cylinder 55, and the outer periphery of the air supply cylinder 55 is covered with a metal protective net 58 larger than the outer diameter.

Further, in such a configuration, the dust push-up protrusion 59 is provided on the upper portion of the rooster 54 so that the waste D to be incinerated can send the outside air to the combustion cylinder 53 without blocking the air outlet 56 in the vicinity of the rooster 54. The ventilation required for combustion can be secured.
Japanese Patent Laid-Open No. 10-185150 (pages 1, 2 and 1)

  However, the invention described in the above-mentioned Patent Document 1 is based on a configuration in which the rooster 54 is installed inside the combustion cylinder 53, and penetrates the rooster 54 for the purpose of ensuring ventilation necessary for combustion. Since the air supply cylinder 55 extending upward and the metal protective net 58 provided on the outer periphery of the cylinder 50 are provided, they hinder the introduction of the waste D to be incinerated from the inlet 51 and use of the internal space. There is a problem that the efficiency is low and further maintenance is required due to clogging or aging of the metal protective net 58.

  By the way, normally, the combusted materials put into the combustion furnace are sequentially accumulated from the bottom of the furnace body, but air is hardly supplied to the vicinity of the bottom of the combusted body, so unburned near the bottom of the furnace body. As a result, there is a problem that the incinerated ash is greatly reduced in heat. Therefore, in order to efficiently and completely burn the combusted material thrown into the furnace body, it is necessary to forcibly supply a necessary amount of air near the bottom of the furnace body and inside the combusted material.

  The present invention has been made in view of such circumstances, and improves the utilization efficiency inside the furnace body by adopting a configuration that eliminates the rooster, thereby reducing the size of the furnace body, and further reducing the cost and simplicity. The device is designed to supply forced air to the combustibles inside the furnace body evenly, increasing the combustion efficiency, and further improving the combustion efficiency in the secondary combustion chamber, greatly increasing the dioxins contained in the exhaust gas. It is an object of the present invention to provide a combustion furnace that can be reduced.

  In order to achieve the above object, claim 1 of the present invention is characterized in that a number of linear concavo-convex shapes facing the direction of the front door are formed at the bottom of the combustion furnace into which the object to be combusted is charged. An air blowing body projecting upward is provided at the bottom of the air blowing body. The air blowing body has an internal space and a plurality of blowing holes directed radially in the outer periphery thereof, and further provided outside the combustion furnace. An air supply pipe from a blower is connected to an internal space of the air blowing body, and forced air fed from the blower is radially ejected from a number of blowing holes of the air blowing body. .

  According to a second aspect of the present invention, in the first aspect, a secondary combustion chamber having a diameter larger than that of the chimney is provided in the middle of the chimney provided in the upper portion of the combustion furnace, and a flame is injected into the secondary combustion chamber. A burner with the outlet tilted upward is attached.

  Further, according to a third aspect of the present invention, in the first and second aspects, the air supply pipe connected to the blower is connected to a chimney side portion above the secondary combustion chamber as a secondary air supply pipe. The next air supply pipe is connected so as to have a blowing direction similar to a spiral rotation direction by a flame of a burner provided in the secondary combustion chamber.

  According to the combustion furnace of the present invention, the following effects can be obtained.

  (1) In the present invention, there is a structure in which an air blowing body is provided at the bottom of the combusted material accumulated in the furnace body, and a plurality of blowing holes directed radially on the outer periphery of the air blowing body. As a result, air supplied from the blower is uniformly and evenly ejected radially from the numerous blow holes in the required direction, so that the accumulated combustibles can be completely burned uniformly from the bottom and inside. Is possible. For this reason, the combustion efficiency of the combustible substance and the heat loss reduction can be improved, combustion with very little residual ash can be performed, non-combustible material does not remain, and a harmless and highly safe combustion furnace can be obtained.

  (2) Moreover, since the air blowing body and the blowing holes formed in the outer periphery thereof have a simple structure, the manufacturing cost is low and the maintenance work is almost unnecessary.

  (3) Further, according to the present invention, since there is no rooster, there is no need for an ash receiving space to be provided in the lower part of the furnace body, and accordingly, the height of the furnace body can be formed low, and thus the entire combustion furnace Therefore, a lightweight and low-cost combustion furnace can be obtained.

  (4) Moreover, in the present invention, since the shape of the bottom of the furnace body provided as an alternative to the conventional rooster, that is, a large number of linear irregularities facing the direction of the front door of the combustion furnace is formed on the bottom of the furnace body, External air flowing in from the air intake provided in the door flows into the uneven shape at the bottom of the furnace body with a low resistance, which is beneficial for complete combustion of the combusted material.

  (5) Furthermore, in the present invention, since there is no rooster, complete combustion can be promoted without unburned ash falling. Furthermore, since the linear uneven | corrugated shape provided in the furnace body bottom part is formed in the direction of a front door, it corresponds with the taking-out direction of ash, and the operation | work which takes out the ash of a furnace body bottom part can be done easily.

  (6) Further, in the present invention, since the air supply from the blower provided outside the combustion furnace to the air blowing body can be performed with one air supply pipe, the cost is low.

  (7) Further, in the present invention, a secondary combustion chamber having a diameter larger than that of the chimney is provided in the middle of the chimney provided in the upper portion of the combustion furnace, and the flame outlet is inclined upward in the secondary combustion chamber. Because the burner is connected, when the exhaust gas from the primary combustion chamber (combustion furnace) passes through the secondary combustion chamber, the flow in the chamber is slowed down, and the residence time of smoke and soot can be increased. Dioxin, soot and smoke can be efficiently reduced by igniting the burner in the secondary combustion chamber. Moreover, by attaching the burner flame outlet to the secondary combustion chamber so as to face upward, an exhaust gas attracting effect can be obtained, thereby improving exhaust gas exhaust in the chimney.

  (8) Further, in the present invention, the air supply pipe connected to the blower is connected to the side of the chimney above the secondary combustion chamber as a secondary supply pipe, and the secondary supply pipe is connected to the secondary combustion pipe. Because it is connected so that the air blowing direction is the same as the spiral rotation direction due to the flame of the burner provided in the chamber, the blowing direction from the secondary air supply pipe matches the spiral rotation direction due to the flame of the burner At the same time as taking a residence time, the exhaust gas can be conveyed upward while mixing the air with the exhaust gas to promote recombustion. Further, when oxygen deficiency occurs in the burner due to the combustion state, there is an action of promoting recombustion of unburned gas, and the stability of combustion can be maintained. Further, by rotating the flame of the burner in a spiral manner depending on the insertion angle of the secondary air supply pipe, the residence time can be secured and the combustion efficiency in the chimney can be improved.

  (9) The above process has a simple structure and drastically reduces the concentration of dioxin contained in the exhaust gas. At the same time, smoke and smoke are also reduced to an unlimited extent, and the amount of incinerated ash is reduced to a very low level. A combustion furnace that meets the standards can be obtained.

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1 or FIG. 2, the combustion furnace 1 according to the present invention has a large number of linear uneven shapes 3, 3,... Facing the front door 2 at the bottom of the combustion furnace 1 into which the combustible D is introduced. (See FIG. 6) is formed, and an air blowing body 4 protruding upward is fixed to the bottom of the combustion furnace 1, and the air blowing body 4 has an internal space and faces radially outward. A number of blow holes 5, 5... Are formed, and an air supply pipe 7 from the blower 6 provided outside the combustion furnace 1 is connected to the internal space of the air blow body 4 to be forced from the blower 6. Air is ejected radially from a number of the blowout holes 5, 5... Of the air blowout body 4.

  Describing in more detail about such a configuration, as shown in FIG. 2, the furnace body 10 of the combustion furnace 1 has a hollowed shape, and is provided with a steel plate and a refractory cement on the inner surface thereof. A front door 2 that has a fireproof structure and is opened and closed by a hinge 12 fixed to the furnace body 10 is provided in an opening 11 (see FIG. 2) provided on the front surface of the furnace body 10.

  As shown in FIG. 1 or FIG. 2, an air intake 14 is provided at the lower part of the front door 2. The air intake 14 is configured so that the upper and lower sides of the rectangular outside air adjustment door 15 are slidably locked by a frame metal fitting 16 and can be slid in the lateral direction by a handle 15 a attached to the outside air adjustment door 15. The amount of air sucked into the furnace body 10 can be adjusted by adjusting the opening degree of the outside air adjustment door 15.

  An inlet 13 is provided at the top of the front door 2. The shooter 17 coupled to the outside of the insertion port 13 is formed of a steel plate having a rectangular tube shape, has an inclined passage having a downward slope toward the inside of the furnace body 10, and an outer portion at the end of the shooter 17. A lid 18 is pivoted so as to be freely opened and closed. The outer lid 18 is provided with a handle 18a for opening and closing, and the outer lid 18 is configured to lock the closed state by a lock fitting or the like (not shown).

  When the outer lid 18 of the shooter 17 configured as described above is opened and the combustible material D is introduced, the combustible material D slides down along the downward gradient in the inclined passage, and the acceleration force in the furnace body 10 Dropped towards the back. For this reason, the combustible D is accumulated in the furnace body 10 without accumulating in the vicinity immediately below the charging port 16.

  Moreover, in this invention, as shown in FIG. 6, many uneven | corrugated shapes 3, 3, ... are formed in the bottom part in the combustion furnace 1. As shown in FIG. These uneven shapes 3, 3... Can be formed by forming linear concave grooves 3a facing the front door 2 at predetermined intervals on the concrete surface at the bottom of the furnace body 10.

  In the present invention, the concavo-convex shape 3 in the combustion furnace 1 is provided as an alternative to the conventional rooster, and external air flowing in from the air intake port 14 provided in the front door 2 flows in with a low resistance, Since the bottom part of the furnace body 10 flows along the concave and convex grooves 3a of the concave and convex shapes 3, 3 ..., the air is efficiently introduced to the vicinity of the bottom part where the combustible D is accumulated and the air is hardly supplied. This is useful for complete combustion of the combustible D. Furthermore, since there is no conventional rooster, complete combustion can be promoted without unburned ash falling.

  Moreover, since the linear uneven | corrugated shape 3, 3 ... provided in the bottom part of the furnace body 10 is formed in the direction of the front door 2, the direction of the ditch | groove 3a corresponds with the ash taking-out direction, and the front door When the inside of the furnace body is opened by opening 2 and the ash scraping bar is used along the respective concave grooves 3a of the linear uneven shapes 3, 3,.

  Furthermore, in the present invention, as shown in FIG. 6, an air blowing body 4 that protrudes upward is fixedly provided at the approximate center of the bottom of the furnace body 10. This air blowing body 4 has an internal space and is formed with a large number of blowing holes 5, 5... Facing in a 360 degree direction or an arbitrary horizontal direction on the outer periphery thereof. However, as described above, the air intake 14 is provided in the front door 2, and external air sufficiently flows into the vicinity of the air intake 14, and flames burning in the furnace from the air intake 14 are backed up. Since it may be induced as a fire, the blowing hole 5 facing the vicinity of the air inlet 14 of the front door 2 may not be provided or may be blocked.

  Moreover, the air blowing body 4 is formed of casters, stainless steel, heat resistant steel or the like, and can be changed depending on the shape of the furnace body 10 of the combustion furnace 1 as shown in FIG. 4 or FIG. That is, as shown in FIG. 4 (a), when the furnace body 10 has a substantially cylindrical shape, the shape of the air blowing body 4 is also a cylindrical shape, and a large number of radially outwardly directed 360 ° directions or arbitrary horizontal directions are provided on the outer periphery thereof. The blow-out holes 5, 5... Are formed, and the tops thereof are flat as shown in FIG. 4 (b), hemispherical as shown in FIG. 4 (c), conical as shown in FIG. It can be made into the shape.

  Further, as shown in FIG. 5 (a), when the furnace body 10 is a rectangular cylinder, the shape of the air blowing body 4 is also approximated to a square cylinder, and the outer periphery thereof is in a 360 degree direction or in an arbitrary horizontal direction. A large number of blowout holes 5, 5... Facing in a radial shape are formed, and the top portion thereof can be formed into a flat shape as shown in FIG. 5 (b) and a pyramid shape or the like as shown in FIG. 5 (c). .

  In the present invention, as shown in FIG. 1, an air supply pipe 19 is connected to the blower 6 provided outside the combustion furnace 1, and the air supply pipe 19 is guided along the bottom of the furnace body 10. The end portion is connected to the internal space of the air blowing body 4, and the forced air fed from the blower 6 through the air supply pipe 19 is passed through the numerous blowing holes 5, 5. 1 is ejected radially.

  In such a configuration, the air supplied from the blower 6 is ejected radially and uniformly from the numerous blowout holes 5, 5..., So that the combustible D accumulated inside the furnace body 10 is blown out of the air. It becomes possible to burn evenly from the bottom around the body 4 and from the inside. For this reason, the combustion efficiency of the combustible D is improved, combustion with very little residual ash can be performed, non-combustible material does not remain, and the incineration ash has a very low loss of heat and a harmless and highly safe combustion furnace. Can be obtained.

  In this embodiment, as shown in FIGS. 1 to 3, a secondary combustion chamber 26 having a diameter larger than that of the chimney 22 is provided in the middle of the chimney 22 provided in the upper portion of the combustion furnace 1. A burner 24 whose flame outlet is inclined upward is connected to the combustion chamber 26. The secondary combustion burner 24 is connected to a fuel tank via a fuel supply pipe (not shown) so that fuel is supplied by a pump operation in the combustion tank.

  By doing so, when the exhaust gas from the combustion furnace 1 functioning as the primary combustion chamber passes through the secondary combustion chamber 26, the flow in the chamber is decelerated and the residence time of smoke and soot can be increased. Further, by igniting the burner 24 in the secondary combustion chamber 26, dioxins, soot and smoke can be efficiently reduced.

  In addition, in the present embodiment, by attaching the flame outlet of the burner 24 to the secondary combustion chamber 26 so as to face upward, an exhaust gas attracting effect can be obtained, thereby improving the exhaust gas exhaust in the chimney 22. To do. Also, the residence time is increased by rotating the flame of the burner 24 in a spiral manner according to the insertion angle of the secondary air supply pipe 23, and the combustion efficiency in the secondary combustion chamber 26 can be increased.

  Further, in this embodiment, as shown in FIGS. 3A and 3B, the air supply pipe connected to the blower 6 is connected to the side of the chimney 22 above the secondary combustion chamber 26. They are connected as an air supply pipe 23, and the secondary air supply pipe 23 is connected so as to have the same air blowing direction as the spiral rotation direction by the flame of the burner 24 provided in the secondary combustion chamber 26.

  With such a configuration, the discharge direction from the secondary air supply pipe 23 is made to coincide with the spiral rotation direction by the flame of the burner 24 to obtain a residence time, and at the same time, air is mixed with the exhaust gas to promote recombustion. The exhaust gas can be conveyed upward. Further, when oxygen deficiency occurs in the burner 24 due to the combustion state, there is an action of promoting recombustion of unburned gas, and the stability of combustion can be maintained. Further, by rotating the flame of the burner 24 in a spiral manner according to the insertion angle of the secondary air supply pipe 23, the residence time can be secured and the combustion efficiency in the chimney 22 can be improved.

  Through the above process, a combustion furnace that has a simple structure and greatly reduces the concentration of dioxin contained in the exhaust gas, at the same time, reduces smoke and smoke as much as possible, and meets legal emission standards with extremely low heat loss. Can be obtained.

  In the above configuration, primary combustion is performed on the combustible D in the furnace body 10 of the combustion furnace 1. In this embodiment, the combustion gas generated by the primary combustion in the furnace body 10 is 2. Since secondary combustion is performed at a high temperature of 800 to 1000 ° C. by the secondary combustion burner 24 in the secondary combustion chamber 26, dioxins in the exhaust gas discharged from the upper end exhaust port 25 of the chimney 22 are greatly suppressed, Trace amount.

  Further, during such secondary combustion, the air forcedly supplied from the blower 6 through the air supply pipe 23 into the chimney 22 is sent in the same direction as the spiral rotation direction by the flame of the secondary combustion burner 24. Since it is in the feed direction, it exhibits a cyclone effect in the chimney 22 and is useful for efficiently reburning unburned gas and removing soot and the like.

  As described above, the combustion furnace of the present invention is beneficial for reducing the size of the furnace body by improving the utilization efficiency of the space in the furnace by adopting a configuration that eliminates the rooster in the combustion furnace, and is inexpensive and simple. Combustion efficiency by making it possible to supply the forced air uniformly from the inside of the combustibles in the furnace with a large number of radially-facing blow holes provided in the air blowing body at the bottom of the furnace. In addition, a secondary combustion chamber having a diameter larger than that of the chimney provided in the combustion furnace, a burner having an upwardly inclined flame outlet, and an air supply connected to the blower are attached to the secondary combustion chamber. A pipe is connected to the chimney side above the secondary combustion chamber as a secondary air supply pipe, and the secondary air supply pipe is blown in the same direction as the spiral rotation by the flame of the burner provided in the secondary combustion chamber. Because it is connected so that It is possible to use as an air supply device for a combustion furnace that can significantly reduce the dioxins exhaust Te.

It is a partially broken side view which shows the combustion furnace in this invention. It is the front view which opened the front door of the combustion furnace in this invention, and showed the inside. (a) is a rear view of the combustion furnace in the present invention, (b) is a cross-sectional view of the chimney (a) is sectional drawing of the combustion furnace in this invention, (b)-(d) is the example of a change of an air blowing body. (a) is sectional drawing which shows the example of a change of the combustion furnace in this invention, (b), (c) is the example of a change of an air blowing body. It is the perspective view which opened the front door of the combustion furnace in this invention, and showed the inside. It is sectional drawing of the conventional refuse incinerator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Combustion furnace 2 ... Front door 3 ... Uneven shape 3a ... Concave groove 4 ... Air blowing body 5 ... Blow hole 6 ... Blower 7 ... Air supply pipe 10 ... Furnace body 11 ... Opening part 12 ... Hinge 14 ... Air intake 15 ... outside air adjusting door 16 ... frame bracket 17 ... shooter 18 ... outer lid 19 ... air supply pipe 22 ... chimney 23 ... secondary air supply pipe 24 ... secondary combustion burner 25 ... upper exhaust port 26 ... secondary combustion chamber D ... Combustible material

Claims (3)

A large number of linear irregularities facing the direction of the front door are formed at the bottom of the combustion furnace where the combustible material is charged, and an air blowing body projecting upward is provided at the bottom of the combustion furnace. The blowout body has an internal space and a plurality of blowout holes are formed on the outer periphery of the blowout body, and an air supply pipe from a blower provided outside the combustion furnace is connected to the internal space of the air blowout body. Then, the forced air fed from the blower is ejected radially from a number of blow holes of the air blowing body. A secondary combustion chamber having a diameter larger than that of the chimney is provided in the middle of the chimney provided in the upper portion of the combustion furnace, and a burner having a flame outlet inclined upward is attached to the secondary combustion chamber. Item 1. A combustion furnace according to Item 1. An air supply pipe connected to the blower is connected to a chimney side portion above the secondary combustion chamber as a secondary air supply pipe, and the secondary air supply pipe is a flame of a burner provided in the secondary combustion chamber. The combustion furnace according to claim 1 or 2, wherein the combustion furnace is connected so as to have a blowing direction similar to a spiral rotation direction.

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