JP2003302029A - Deodorizing device for asphalt plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To require smaller installation space and reduce fuel consumption. <P>SOLUTION: This deodorizing device 20a comprises a vertically arranged deodorizing furnace 23 having a deodorizing furnace burner 27 at the lower part and a gas introduction part 22 for introducing deodorized gas, a stack 24 erected at the upper end of the deodorizing furnace 23, an air preheater 26 having an outer cylinder outside the deodorizing furnace 23 and the lower part of the stack to form an air passage e, and a blower for supplying combustion air through the air preheater 26 to the deodorizing furnace burner 27. Odored gas introduced through the gas introduction part 22 into a gas combustion chamber 23b is burnt using combustion gas from the deodorizing furnace burner 27 to which air is supplied through the air preheater 26, and its exhaust gas is released from the stack 24. The temperature rise of the combustion air from the deodorizing furnace burner 27 with the air preheater 26 improves combustion efficiency and reduces fuel consumption. The vertical arrangement of the deodorizing furnace 23, the stack 24, the air preheater 26 and the deodorizing furnace burner 27 requires smaller installation space. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing device for an asphalt plant that burns and deodorizes odorous gas discharged from a dryer for drying and heating aggregates such as an odor control type asphalt mixture regenerating plant.

[0002]

2. Description of the Related Art Conventionally, as this kind of odor control type asphalt mixture recycling plant, one shown in FIG. 3 is known. This odor control type asphalt mixture recycling plant 1A
Is introduced into the dryer 3 having the burner 2 at one end side by introducing waste asphalt pavement material (mixture to be regenerated) from one end side and transferring it to the other end side by the heat of the combustion gas generated by the burner 2. It is dried and heated, and the recycled mixture produced by this drying and heating is taken out from the lower part of the discharge tube 4 provided on the other end side of the dryer 3, and the odorous gas discharged from the upper part of the discharge tube 4 is fed to the fan 5. It is sent to the deodorizing furnace 8 via the first heat exchanger 7 by the duct 6 and burned in the deodorizing furnace burner 9 by the duct 6, and the exhaust gas from the deodorizing furnace 8 is sent to the first heat exchanger 7 by the duct 10. The odorous gas from the exhaust pipe 4 is preheated and further sent to the second heat exchanger 11 to heat the combustion air sent from the blower 12 to the deodorizing furnace burner 9 and then discharged from the chimney 13 to the atmosphere. Has become (special Flat reference Patent Publication No. 8-218311).
The ducts 6 and 10, the first and second heat exchangers 7 and 11, the deodorizing furnace 8, the deodorizing furnace burner 9 and the chimney 13 constitute a deodorizing device 1a.

As shown in FIG. 4, the deodorizing furnace 8 of the deodorizing apparatus 1a is provided with a gas combustion chamber 14 at one end and an exhaust port 15 connected to the duct 10 at the other end, and an intermediate portion in the middle. A cylindrical furnace body 17 provided with a heating member 16 is horizontally arranged, and the deodorizing furnace burner 9 is attached to one end of the gas combustion chamber 14 and heated by the second heat exchanger 11. A duct 18 for introducing combustion air is connected, and a gas introduction portion 19 is provided on the outer periphery of the gas combustion chamber 14.
Is provided and the duct 6 is connected, and the odorous gas introduced from the duct 6 into the gas introduction portion 19 enters the gas combustion chamber 14 through a plurality of vent holes 14a provided around the gas combustion chamber 14. There, the combustion gas from the deodorizing furnace burner 9 is primarily burned and then secondarily burned in the furnace body 17.

As another odor control type asphalt mixture regeneration plant 1B, as shown in FIG. 5, the deodorizing device 1a of the odor control type asphalt mixture regeneration plant 1A.
Omitting the first and second heat exchangers 7 and 11 in
The deodorizing device 1b is provided so that the odorous gas from the exhaust pipe 4 is directly introduced into the deodorizing furnace 8 by the fan 5 through the duct 6 and burned, and the exhaust gas is sent directly from the duct 10 to the chimney 13. Things are also known. Since other configurations are the same as those of the odor control type asphalt mixture regenerating plant 1A, the same reference numerals are given to the same configurations and the description thereof will be omitted.

Further, as another odor control type asphalt mixture regenerating plant 1C, as shown in FIG. 6, a furnace body 17A of a deodorizing furnace 8A is vertically arranged and a chimney 1 is provided at the upper end thereof.
3A is erected, and a gas combustion chamber 14 having a deodorizing furnace burner 9 and a gas introducing portion 19 are provided in communication with each other next to the lower part of the furnace body 17A, and by the combustion gas by the deodorizing furnace burner 9 in the gas combustion chamber 14. After the odorous gas is primarily burned, it is secondarily burned in the furnace body 17A and its exhaust gas is directly emitted to the chimney 13A.
There is also known one provided with a deodorizing device 1c adapted to be released from the air into the atmosphere.

[0006]

However, in the deodorizing apparatuses 1a and 1b of the odor control type asphalt mixture regenerating plant 1A and 1B, since the deodorizing furnace 8 is arranged horizontally, the required installation space is large. Therefore, there is a problem that the installation place of the odor control type asphalt mixture recycling plant 1A, 1B is restricted. Particularly, in the odor control type asphalt mixture regenerating plant 1A, since the odorous gas sent to the deodorizing furnace 8 is provided with the first and second heat exchangers 7 and 11, the combustion efficiency by the deodorizing furnace burner 9 is increased. Although the fuel consumption is increased and the fuel consumption is small, the structure is complicated and the equipment cost is increased, and the required installation space is increased by the amount corresponding to the first and second heat exchangers 7 and 11. The problem of being restricted in the place of installation is even more pronounced. Further, the deodorizing device 1b of the odor control type asphalt mixture regenerating plant 1B has a simple structure because the first and second heat exchangers 7 and 11 are not provided,
Since the heat in the high-temperature exhaust gas discharged from the deodorization furnace 8 cannot be recovered, there is a drawback that the combustion efficiency by the deodorization furnace burner 9 is poor and the fuel consumption thereof increases.

Further, in the deodorizing apparatus 1c of the odor control type asphalt mixture recycling plant 1C, the deodorizing furnace 8 is used.
Since the furnace body 17A of A and the chimney 13A are vertically arranged, the required installation space is smaller than that of the case of the deodorizing devices 1a and 1b, but the deodorizing furnace burner 9, the gas combustion chamber 14 and the gas introducing portion are required. Since 19 is provided beside the furnace main body 17A, the required installation space is correspondingly increased, and since the first and second heat exchangers 7 and 11 are not provided, similar to the deodorizing device 1b. In addition, there is a drawback that fuel consumption by the deodorizing furnace burner 9 increases. Further, there is also a problem that the furnace wall of the furnace body 17A is easily damaged by the flame from the lateral direction by the deodorizing furnace burner 9.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a deodorizing device for an asphalt plant, which requires a small installation space and can reduce fuel consumption.

[0009]

The present invention is characterized by the following points in order to solve the above problems. That is,
A deodorizing apparatus for an asphalt plant according to claim 1, wherein a deodorizing furnace burner is provided at a lower portion and a gas introducing portion for introducing a deodorizing gas from the asphalt plant is provided vertically, and an upper end of the deodorizing furnace. And a chimney erected in
An air preheater formed by providing an outer cylinder at a distance from the outside of at least a part of the deodorizing furnace and the chimney, and supplying combustion air to the deodorizing furnace burner via the air preheater. It is characterized by having a blower.

The deodorizing device for an asphalt plant according to a second aspect is the deodorizing device according to the first aspect, in which the outer cylinder of the air preheater is provided so as to surround the lower part of the chimney and the entire deodorizing furnace. A blower is provided in the upper part of the outer cylinder so as to communicate with the air preheater, and a deodorizing furnace burner is connected to the air preheater in the lower part of the outer cylinder.

Further, the deodorizing device for an asphalt plant according to claim 3 is the deodorizing device according to claim 1 or 2, wherein the deodorizing furnace has a plurality of gas introduction holes at its lower end and a deodorizing furnace at the bottom. A cylindrical gas combustion chamber provided with a burner is provided, and a gas introduction unit is provided so as to surround the gas combustion chamber with an annular space between the gas combustion chamber and the gas introduction unit, and the gas introduction unit is a dryer of an asphalt plant. It is characterized by being connected via a duct.

A deodorizing device for an asphalt plant according to a fourth aspect is the deodorizing device according to the third aspect.
It is characterized in that the inner peripheral surface of the gas combustion chamber and the lower inner peripheral surface of the deodorizing furnace are provided with a lining made of a refractory material.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A deodorizing apparatus for an asphalt plant according to an embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. In FIG. 1, 20 is an asphalt mixture recycling plant (asphalt plant) equipped with a deodorizing device 20a according to an embodiment of the present invention. The asphalt mixture regeneration plant 20 is the conventional odor control type asphalt mixture regeneration plant 1A, 1B, 1C.
Similarly, the burner 2 is provided at one end side and the dryer 3 having the discharge tube 4 at the other end side is provided, and the odorous gas (deodorized gas) discharged from the discharge tube 4 is passed through the duct 6 having the fan 5. It is designed to be sent to the deodorizing device 20a.

The deodorizing device 20a, as shown in FIG. 2, has a cylindrical base 21 installed on the ground (floor surface) F,
Cylindrical gas introduction part 22 fixed to the upper end of the frame 21
A cylindrical deodorizing furnace 23 fixed to the gas introducing portion 22 and arranged vertically, a cylindrical chimney 24 standing on the upper end of the deodorizing furnace 23, and an upper end of the gas introducing portion 22. It is fixed and the lower part of the chimney 24 and the furnace body 23 of the deodorizing furnace 23.
an air preheater 26 in which an annular air passage e is formed by an outer cylinder 25 provided around the a at a predetermined interval between them, a deodorizing furnace burner 27 provided in the lower portion of the deodorizing furnace 23, and An air blower 29 (see FIG. 1) that sends outside air (air) into the air preheater 26 through an air supply duct 28 connected to the upper end of the air preheater 26, and a lower portion of the air preheater 26 is connected to the deodorizing furnace burner. And a duct 30 communicating with the combustion chamber 27. The mount 21, the gas introduction unit 22,
The air preheater 26 and the chimney 24 (large-diameter portion 24b) are formed to have the same or substantially the same diameter, are arranged on the same axis, and are vertically installed on the ground F.

The deodorizing furnace 23 is provided with a cylindrical gas combustion chamber 23b having a plurality of vent holes 23c formed around it, which is fixed to the lower end of the furnace body 23a. By being arranged inside the gas introducing part 22, an annular gas introducing space (annular space) G is formed in the gas introducing part 22, and the odorous gas from the duct 6 is introduced into the gas introducing space G, The gas is entered into the gas combustion chamber 23b through the vent hole 23c. The deodorizing furnace burner 27 is attached to the lower end of the gas combustion chamber 23b with its nozzle facing the inside of the gas combustion chamber 23b. Inner linings 31a and 31b made of a refractory material such as ceramics are provided on the inner peripheral surfaces of the gas combustion chamber 23b and the lower portion of the furnace body 23a.

The chimney 24 has a small diameter portion 24 at the bottom.
a and an upper large-diameter portion 24b are connected to each other through a connecting portion 32, and a lower end of the small-diameter portion 24a is connected to an upper end of a tapered cylindrical portion 23d of the furnace body 23a via a connecting portion 33. Are connected and communicated with the furnace body 23a. The outer cylinder 25 of the air preheater 26 includes a lower outer cylinder 25a that surrounds the furnace body 23 and the chimney 2 following the shape of the furnace body 23a.
4 has an upper outer cylinder 25b surrounding the small diameter portion 24a of 4,
An upper portion of the upper outer cylinder 25b is formed in a large-diameter annular chamber 25c having the same diameter as the large-diameter portion 24b of the chimney 24, and the downstream end of the duct 28 is connected to the annular chamber 25c.

The furnace main body 23a and the lower outer cylinder 25a are appropriately connected by a connecting member to be integrated into one furnace body side portion, and the small diameter part 24a of the chimney 24 and the upper outer cylinder 25b are properly connected. 1 connected by members
The chimney side part and the chimney side part are assembled so as to be separable from each other at the connecting part 33, and the chimney side part and the large diameter part 24b of the chimney 24 are connected at the connecting part 32. The furnace body side part and the gas introduction part 22 are separably assembled at the connecting part 34. Although not shown, a heat insulating material is attached to the outer peripheral portion of the outer cylinder 25. Further, in FIG. 1, odorous gas (deodorized gas) is sent from the exhaust stack 4 to the fan 5 through the duct 6, but a dust collecting device such as a cyclone is installed between the exhaust stack 4 and the fan 5. It can also be equipped. In this case, the odorous gas (deodorized gas) collected by the dust collector can be sent to the fan 5.

Next, the operation of the deodorizing device 20a of the asphalt plant according to the above embodiment will be described. The asphalt mixture regenerating plant 20 equipped with the deodorizing device 20a is the same as the conventional odor control type asphalt mixture regenerating plant 1A, 1B, 1C, and the asphalt pavement waste material (regenerated mixture material) put into the dryer 3. Burner 2
Dry and heat with the combustion gas of. At that time, the odorous gas discharged from the exhaust pipe 4 is introduced into the gas introduction space G of the gas introduction part 22 of the deodorizing device 20a through the duct 6 by the operation of the fan 5. In the deodorizing furnace 23 of the deodorizing device 20a, since the deodorizing furnace burner 27 is operated in advance and the combustion gas is blown into the gas combustion chamber 23b, the odorous gas introduced into the gas introducing space G is discharged from the vent hole 23c. Gas combustion chamber 2
3b, comes into contact with the combustion gas to perform primary combustion, and secondarily burns while rising in the furnace body 23a to completely remove odorous components.
It is emitted from the upper part of a through the chimney 24 to the atmosphere.

Meanwhile, by the operation of the blower 29, outside air is introduced into the annular chamber 25c above the outer cylinder 25 of the air preheater 26 through the duct 28, and this outside air passes through the air passage e and flows into the furnace body 23a. Reaching the lower end, duct 30
Is used as combustion air for the deodorizing furnace burner 27. The ambient air as the combustion air is heated to about 200 ° C. by the combustion gas of the deodorizing furnace 23 while passing through the air passage e of the air preheater 26, while the furnace body 23
Since a is cooled, the furnace body 23a is sufficiently protected from heat without being lined with a refractory material except for the lower part which is strongly exposed to the radiant heat of the combustion gas, and the service life can be extended. The combustion air heated and raised in temperature improves the combustion efficiency of the deodorizing furnace burner 27 and enables reduction of fuel consumption.

According to the deodorizing apparatus 20a for an asphalt plant according to this embodiment, the deodorizing furnace burner 27 is provided at the lower end.
The gas combustion chamber 23b attached with the gas combustion chamber 23b is provided in the lower part of the furnace body 23a, and the gas introduction part 22 for introducing the odorous gas (deodorized gas) from the asphalt plant is provided in the gas combustion chamber 23b.
A vertical deodorizing furnace 23 provided on the outside of the deodorizing furnace 23, a chimney 24 standing upright on the upper end of the deodorizing furnace 23, and an outer circumference of the deodorizing furnace 23 and the lower part of the chimney 24, between them. An air preheater 26 in which an air passage e is formed by an outer cylinder 25 provided at an interval between the air preheater 26 and a blower 29 for supplying outside air as combustion air to the deodorizing furnace burner 27 through the air preheater 26. Since the configuration is provided, the deodorizing furnace 23, the deodorizing furnace burner 27, the air preheater 26, and the chimney 24 are arranged vertically in a straight line as a whole, and the required installation space of the deodorizing device 20a is approximately the same as that of a conventional chimney. The size can be made extremely small, and the degree of freedom in selecting the installation site of the asphalt plant equipped with the deodorizing device can be increased. Also,
Combustion air supplied to the deodorizing furnace burner 27 is supplied to the air preheater 2
Since the heating temperature can be raised by the exhaust from the deodorizing furnace 23 and the chimney 24 in 6, the exhaust heat can be effectively recovered and the combustion efficiency of the deodorizing burner 27 can be improved.
The fuel consumption can be reduced.

A blower 29 is provided above the outer cylinder 25 of the air preheater 26 so as to communicate with the air preheater 26 via a duct 28, and a deodorizing furnace burner 27 is preheated to the air under the outer cylinder 25. Since it is connected to the air conditioner 26, the exhaust air from the deodorizing furnace 23 is effectively cooled by the outside air (air) having a relatively low temperature (normal temperature) introduced into the upper portion of the air preheater 26, so that it is discharged from the chimney 24. The temperature of the generated exhaust gas can be lowered, and the outside air is preheated in the upper part of the air preheater and gradually heated by the combustion gas in the deodorizing furnace 23 as it goes down. Therefore, the combustion air can be efficiently heated to a high temperature before reaching the deodorizing furnace burner 27, and the thermal efficiency of the deodorizing device 20a can be further improved.

Further, at the lower end of the deodorizing furnace 23, there is provided a cylindrical gas combustion chamber 23b having a plurality of gas introducing holes 23c in the periphery and the deodorizing furnace burner 27 at the lower part thereof. Since the gas introduction part 22 is provided outside the space of the annular space G, and the gas introduction part 22 is connected to the dryer 3 of the asphalt plant 20 through the duct 6, the gas introduction part 22 from the asphalt plant 20.
The odorous gas introduced into the annular space G of the gas combustion chamber 23
The gas is introduced into the gas combustion chamber 23b evenly from around b, and is efficiently burned by the combustion gas from the deodorizing furnace burner 27,
The exhaust gas can be smoothly raised from the deodorizing furnace 23 toward the chimney 24.

Further, since the inner peripheral surface of the gas combustion chamber 23b and the lower inner peripheral surface of the deodorizing furnace 23 are provided with inner linings 31a and 31b made of a refractory material such as ceramics,
The inner peripheral portions of the gas combustion chamber 23b and the lower portion of the deodorizing furnace 23, which are strongly exposed to the radiant heat of the combustion gas from the deodorizing furnace burner 27, are protected from heat by the linings 31a and 31b and are not damaged. The service life of can be extended.

In the asphalt plant deodorizing apparatus 20a according to the above embodiment, the outer cylinder 25 is provided around the entire deodorizing furnace 23 and the entire lower portion of the chimney 24 to form the air preheater 26. However, not limited to this, the air preheater 23 may be provided only in the deodorizing furnace 23 without being provided on the side of the chimney 24, and may be provided not only in the lower portion of the chimney 24 but also in the entire deodorizing furnace 23, It may be partially arranged on the outer peripheral portion of the chimney 24.

Further, the case where the deodorizing device 20a is installed in the asphalt composite material regenerating plant for producing the reclaimed composite material by introducing only the asphalt pavement waste material (recycled composite material) into the dryer 3 has been described. Is not limited to this, in various types of dryers such as double structure, tandem structure,
An asphalt plant that produces new asphalt and waste asphalt pavement, individually dry heats them and takes them out from the dryer individually, or mixes both after dry heating to produce an asphalt mix, The aggregate can be used by being provided in various asphalt plants such as an asphalt plant in which an aggregate is dried and heated to add asphalt and the like to produce an asphalt mixture.

[0026]

As described above, the present invention has the following excellent effects. According to the deodorizing device for an asphalt plant according to claim 1, since the deodorizing furnace, the deodorizing furnace burner, the air preheater and the chimney are arranged vertically in a straight line as a whole, the required installation space for the deodorizing device is maximized. It is possible to reduce the size, and it is possible to increase the degree of freedom in selecting the installation place of the asphalt plan equipped with the deodorizing device. Further, the combustion air supplied to the deodorizing furnace burner can be heated and heated by the air from the deodorizing furnace and the chimney in the air preheater, so the exhaust heat can be effectively recovered to improve the combustion efficiency of the deodorizing furnace burner. It can be improved and the fuel consumption can be reduced.

According to the deodorizing apparatus for an asphalt plant according to the second aspect, the exhaust gas from the deodorizing furnace is effectively cooled by the air at a relatively low temperature (normal temperature) introduced into the upper part of the air preheater, so that the chimney is improved. The temperature of the exhaust gas discharged from the air can be lowered, and the air is preheated in the upper part of the air preheater and gradually heated by the combustion gas in the deodorizing furnace as it descends. In addition, the combustion air can be efficiently heated to a high temperature,
The thermal efficiency of the deodorizing device can be further improved.

According to the deodorizing apparatus for an asphalt plant according to the third aspect, the deodorized gas introduced from the asphalt plant into the annular space of the gas introduction section is introduced into the gas combustion chamber evenly from around the gas combustion chamber. The combustion gas from the deodorizing furnace burner can be efficiently burned, and the exhaust gas can be smoothly raised from the deodorizing furnace toward the chimney.

According to the deodorizing apparatus of the asphalt plant according to the fourth aspect, the inner peripheral portion between the gas combustion chamber and the lower portion of the deodorizing furnace, which receives the radiant heat of the combustion gas from the deodorizing furnace burner, is protected from the heat by the lining of the refractory material. It is protected and not damaged, and the life of the deodorizing furnace can be extended.

[Brief description of drawings]

FIG. 1 is a system diagram showing an odor control type asphalt mixture recycling plant equipped with a deodorizing device according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a deodorizing device for an asphalt plant according to an embodiment of the present invention.

FIG. 3 is a system diagram showing an example of a conventional odor control type asphalt mixture recycling plant.

FIG. 4 is a vertical sectional view showing an example of a conventional deodorizing device.

FIG. 5 is a system diagram showing another example of a conventional odor control type asphalt regeneration mixture plant.

FIG. 6 is a system diagram showing still another example of a conventional odor control type asphalt mixture recycling plant.

[Explanation of symbols]

20 Odor Countermeasure Asphalt Mixture Regeneration Plant (Asphalt Plant) 20a Deodorizing Device 6, 28, 30 Duct 22 Gas Introducing Section 23 Deodorizing Furnace 23a Furnace Main Body 23b Gas Combustion Chamber 23c Vent 24 Chimney 25 Outer Cylinder 26 Air Preheater 27 Deodorizing Furnace burners 31a, 31b Lining e Air passage G Gas introduction space (annular space)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F23M 5/00 F23M 5/00 C F term (reference) 2D052 AA07 BA08 BA23 CA13 DA22 3K023 QA12 QC08 3K065 AA23 AB01 AC19 FB01 FB03 3K078 BA03 BA18 BA23 CA02 CA07 CA22

Claims (4)

[Claims] 1. A deodorizing furnace vertically arranged with a deodorizing furnace burner provided at a lower portion thereof and a gas introducing portion for introducing a deodorized gas from an asphalt plant, and a chimney erected on an upper end of the deodorizing furnace. An air preheater formed by providing an outer cylinder at a distance from the outside of at least a part of the deodorizing furnace and the chimney, and supplying combustion air to the deodorizing furnace burner via the air preheater. A deodorizing device for an asphalt plant, which is equipped with a blower. 2. The outer cylinder of the air preheater is provided so as to surround the lower part of the chimney and the entire deodorizing furnace, and the blower is provided in the upper part of the outer cylinder so as to communicate with the air preheater. The deodorizing apparatus for an asphalt plant according to claim 1, wherein the deodorizing furnace burner is connected to an air preheater at a lower portion of the outer cylinder. 3. A cylindrical gas combustion chamber provided with a plurality of gas introduction holes in the periphery and having the deodorization furnace burner in the lower part at the lower end portion of the deodorization furnace, and the gas combustion chamber is provided between the gas combustion chamber and it. 3. The gas introducing part is provided so as to surround and surround an annular space, and the gas introducing part is connected to a dryer of an asphalt plant via a duct. Deodorizing equipment for asphalt plants. 4. The deodorizing device for an asphalt plant according to claim 3, wherein an inner lining made of a refractory material is provided on an inner peripheral surface of the gas combustion chamber and a lower inner peripheral surface of the deodorizing furnace. .