JP3796306B2 - Asphalt compound production equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for producing asphalt mixture which is road pavement waste material, and more particularly to an asphalt mixture production apparatus provided with a new material dryer for heating new aggregate and a waste material dryer for heating waste material.
[0002]
[Prior art]
Asphalt pavement waste material (hereinafter referred to as “waste material”) excavated by road construction and the like is heated and regenerated and reused as asphalt mixture. However, when waste materials containing asphalt are heated, malodorous exhaust gas is generated depending on the heating conditions, which may cause a problem of non-negligible pollution due to the stink around the plant.
[0003]
Therefore, as described in Japanese Patent Laid-Open No. 5-39605, the present applicant has provided a waste material dryer in addition to a new material dryer, and provided a combustion chamber that also serves as a deodorizing furnace in the new material dryer, on the downstream side of the combustion chamber. Connected to the hot air outlet duct, the end of the hot air outlet duct to the material supply side of the waste dryer, and the end of the exhaust duct of the waste dryer to the upstream side of the combustion chamber Proposing manufacturing equipment.
[0004]
In this apparatus, when the new aggregate is heated by the new material dryer, the hot air generated in the combustion chamber of the new material dryer is led to the waste material dryer, and the waste material is heated and regenerated by the hot air. The exhaust gas containing malodorous components generated when the waste material is heated and regenerated is returned to the combustion chamber of the new material dryer from the waste material dryer, and the malodorous components in the exhaust gas are burned and deodorized in the combustion chamber. .
[0005]
[Problems to be solved by the invention]
However, when only the waste material is heated and regenerated by the asphalt composite material manufacturing apparatus described above, a part of the hot air generated in the combustion chamber of the new material dryer is led to the waste material dryer side, but most of the hot air Will pass through the new material dryer without being used for heating the new aggregate, and will flow downstream of the new material dryer. The downstream bag filter may be exposed to high temperatures and burn the filter cloth, heating only the waste material. The device cannot be played back.
[0006]
An object of the present invention is to provide an asphalt composite material manufacturing apparatus that can improve the conventional apparatus and perform heating regeneration only with waste materials.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention is provided with a new material dryer for heating new aggregates and a waste material dryer for heating waste materials, and a new material dryer is provided through a combustion chamber of an appropriate length at one end. the burner for wood heating is provided, the flow channel opening and closing damper for opening and closing control of the hot air flow path in a hot air inlet duct for feeding hot air to the new material dryer from the burner is provided, new bone material at the other end of the new material dryer While providing supply means, a hot air outlet duct is connected to the downstream side of the combustion chamber, and the other end of the hot air outlet duct is connected to the waste material supply side of one end portion of the waste material dryer and connected to the other end portion of the waste material dryer. The exhaust duct is connected to the upstream side of the combustion chamber of the new material dryer via an exhaust fan and an air volume adjusting damper, and the exhaust duct of the waste material dryer is branched from the front of the air volume adjusting damper to connect a bypass duct. Setting It is characterized in that the end of the bypass duct and consolidated in the downstream exhaust gas flow path than the flow path opening and closing the damper.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
According to the asphalt composite material manufacturing apparatus of the present invention, when the waste material is heated alone, first, the flow opening / closing damper disposed in the hot air introduction duct downstream of the combustion chamber is closed so that the high temperature hot air is on the new material dryer side. In addition, the air volume adjusting damper disposed on the combustion chamber side of the exhaust duct of the waste dryer is closed so that the exhaust gas derived from the waste dryer flows to the bypass duct side without flowing to the combustion chamber. deep.
[0009]
When hot air is generated in the combustion chamber, the hot air is not led out to the new material dryer side downstream of the combustion chamber, but flows into the waste material dryer side exclusively from the hot air outlet duct connected to the downstream side of the combustion chamber. After heating the waste material in waste dryer, but the exhaust gas is led out to the exhaust duct, a combustion chamber side of the exhaust duct does not flow into the combustion chamber in order to that have been closed by the air-flow control damper, for air volume regulation It flows to the bypass duct that branches off in front of the damper. The exhaust gas that has passed through this bypass duct is guided to the bag filter and discharged into the atmosphere.
[0010]
In this way, when the waste material is heated alone, all the hot air generated in the burner flows to the waste material dryer side, and the exhaust gas of the waste material dryer flows from the bypass duct to the bag filter. This prevents the bag filter from being damaged without passing through the wood dryer and flowing into the bag filter.
[0011]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0012]
Reference numeral 1 denotes a new material dryer of an asphalt plant for heating and drying new aggregates, which rotatably supports a cylindrical drum 2 around which a number of scraping blades are provided, and a driving device (not shown). Is rotated at a predetermined speed. A burner 3 is provided on the hot hopper 4 side of the new material dryer 1, and a new aggregate is provided on the cold hopper 6 side while forming a flame in the combustion chamber 5 and feeding hot gas into the drum 2. The new aggregate is introduced through the conveyor 7 as means, and the new aggregate is heated to a predetermined temperature while being rolled down while being scraped up by the scraping blades and discharged from the discharge unit 8. The cold hopper 6 of the new material dryer 1 is connected with an exhaust flue 9 serving as an exhaust gas flow path, downstream of which is an exhaust fan 10 for sucking exhaust gas, a bag filter 11 for removing dust in the exhaust gas, and exhaust gas in the atmosphere. The chimney 12 which discharges to is provided.
[0013]
A deodorizing furnace 13 is disposed in front of the combustion chamber 5, and the deodorizing furnace 13 secures a hot air passage that takes 1 second or more for hot air to pass in order to completely burn malodorous components in the exhaust gas. It is preferable. Note that the combustion chamber 5 may be lengthened and used also as the deodorizing furnace 13.
[0014]
14 is a waste material dryer that heats and recycles waste material, and has substantially the same structure as that of the new material dryer 1, and a scraper blade is provided around a cylindrical drum 15 that is rotatably supported in an inclined manner. A hot hopper 16 is provided in the part, and a cold hopper 17 is provided in the other end part. Then, the waste material is supplied from the hot hopper 16 side by the conveyor 18 which is a waste material supply means, and the waste material is heated to a predetermined temperature while being tumbled down in the drum while being scraped up by the scraping blade, and is discharged from the discharge unit 19.
[0015]
In order to guide the hot air generated by the burner 3 to the waste material dryer 14 , the deodorizing furnace 13 on the downstream side of the combustion chamber 5 and the hot hopper 16 of the waste material dryer 14 are connected by a hot air outlet duct 20. Further, an exhaust duct 21 is connected to the cold hopper 17 of the waste material dryer 14, a cyclone dust collector 22 and an exhaust fan 23 are provided in the middle of the exhaust duct 21, and the other end is provided with a new material via an air volume adjusting damper 24. The dryer 1 is connected to the upstream side of the combustion chamber 5.
[0016]
Further, if necessary, the exhaust duct 21 is branched downstream of the exhaust fan 23 and connected to a circulation duct 25. An air volume adjusting damper 26 is provided in the middle of the circulation duct 25, and the other end is led to the hot air. It is connected to the duct 20 and circulates a part of the exhaust gas having a reduced temperature discharged from the waste material dryer 14 so as to merge with the high temperature hot air in the hot air derivation duct 20, and the hot air introduced into the waste material dryer 14 is suitable for heating the waste material. Adjust the temperature appropriately.
[0017]
The exhaust duct 21 is branched in front of the air volume adjusting damper 24 to connect the bypass duct 27 and the other end is connected to the exhaust flue 9 in front of the bag filter 11. At this time, the other end of the bypass duct 27 only needs to be connected to the exhaust gas flow path in front of the bag filter 11 and is connected to the exhaust flue 9 in the above embodiment, but the deodorizing furnace 13 is connected as shown by the dotted line. You may connect with the hot air introduction duct 28 which sends the hot air which passed through to the new material dryer 1. FIG.
[0018]
29 is a flow path opening / closing damper disposed in the hot air introduction duct 28, and 30, 31 and 32 are air volume adjusting dampers disposed in the exhaust flue 9, the hot air derivation duct 20 and the bypass duct 27, respectively. .
[0019]
Therefore, when simultaneously heating the new aggregate and the waste material, the flow path opening / closing damper 29 is opened in advance and the air volume adjusting damper 32 is closed. Then, the burner 3 is burned to form a flame in the combustion chamber 5, and hot air is sucked by the downstream exhaust fan 10 to maintain a high-temperature gas flow passing through the deodorizing furnace 13 and the drum 2. Then, the new aggregate is supplied into the drum 2 by the conveyor 7 to heat the aggregate to a predetermined temperature. The combustion control of the burner 3 at this time makes the temperature of the hot air in the deodorizing furnace 13 downstream of the combustion chamber 5 variable within a predetermined temperature, for example, 700 ° C. to 1200 ° C.
[0020]
Next, a part of hot air generated in the combustion chamber 5 is sucked from the deodorizing furnace 13 through the hot air derivation duct 20 while the exhaust fan 23 downstream of the waste material dryer 14 is driven to adjust the suction amount by the air volume adjusting dampers 26 and 31. Then, it is led into the waste material dryer 14. Then, the waste material is supplied from the hot hopper 16 side of the waste material dryer 14 by the conveyor 18, and the waste material is heated to a predetermined temperature by a cocurrent heating system.
[0021]
At this time, if the circulation duct 25 is provided, the amount of gas circulation is adjusted by the air volume adjusting damper 26 and the hot air temperature introduced into the waste material dryer 14 is adjusted to a temperature suitable for heating the waste material.
[0022]
The exhaust gas discharged from the waste material dryer 14 is sent to the combustion chamber 5 after the dust is removed by the cyclone dust collector 22. This is Utosuru by temperature variation in the combustion chamber 5 is controlled so as to adjust the combustion rate of the burner 3 to maintain the temperature of hot air deodorizing furnace 13 in the vicinity of about 800 ° C..
[0023]
Exhaust gas sent from the waste material dryer 14 to the combustion chamber 5 is exposed to a flame of about 1200 ° C. and further takes 1 second or more to contact with hot air of 800 ° C. or more while passing through the deodorizing furnace 13. The contained malodorous components are decomposed by combustion and deodorized. In addition, since the high-temperature exhaust gas discharged from the waste material dryer 14 passes through the new material dryer 1, heat is recovered in the new material dryer 1 so that the heat can be effectively used.
[0024]
Further, when the waste material is heated and regenerated by the waste material dryer 14, first, the exhaust gas flow channel is closed by operating the flow channel opening / closing damper 29 of the hot air introduction duct 28 disposed at the inlet of the new material dryer 1. The hot air is prevented from flowing into the new material dryer 1. Further, the air volume adjusting damper 24 of the exhaust duct 21 is closed so that the exhaust gas derived from the waste material dryer 14 does not return to the combustion chamber 5.
[0025]
Next, the exhaust fan 23 downstream of the waste material dryer 14 is driven and the amount of gas is adjusted by the dampers 26 and 31, and all of the hot air generated in the combustion chamber 5 is led to the hot air derivation duct 20 and introduced into the waste material dryer 14. The exhaust gas derived from the waste material dryer 14 flows to the bypass duct 27 side through the exhaust duct 21, passes through the bag filter 11, and is discharged from the chimney 12. During this time, the waste material is supplied to the waste material dryer 14 by the conveyor 18, heated to a desired temperature by hot air passing through the waste material dryer 14, and discharged from the discharge unit 19.
[0026]
As described above, when only the waste material is heated and regenerated alone, all hot hot air generated in the burner 3 flows to the waste material dryer 14 side, and the exhaust gas of the waste material dryer 14 also flows from the bypass duct 27 to the bag filter 11. Since it was made to flow, hot hot air does not flow directly through the new material dryer 1 and directly into the bag filter 11, and damage to the filter cloth of the bag filter 11 can be prevented. The exhaust gas derived from the waste material dryer 14 does not pass through the deodorization furnace 13 and thus is not deodorized. However, the time for heating only the waste material alone is extremely short, and the bag filter 11 can remove mist having odorous components. So there is no problem.
[0027]
In this embodiment, hot air for heating the waste material is extracted from the deodorizing furnace 13 downstream of the combustion chamber 5, but the downstream portion of the combustion chamber 5, the hot hopper 4 of the new material dryer 1, or the high temperature of the drum 2. You may make it extract hot air from the part vicinity. In the embodiment, the exhaust duct 21 of the waste material dryer 14 is connected to the vicinity of the burner 3 on the upstream side of the combustion chamber 5, but the exhaust gas may be used as the primary combustion air by connecting to the primary air intake portion of the burner 3. good.
[0028]
Furthermore, in this embodiment, a part of the exhaust gas discharged from the waste material dryer 14 is circulated through the circulation duct 25 and the temperature of the hot air introduced into the waste material dryer 14 is adjusted. The hot air may be introduced into the waste material dryer 14, or the temperature of the hot air may be adjusted as a structure for taking in outside air. Further, it is needless to say that various changes can be made without departing from the gist of the present invention, such as providing an auxiliary burner on the hot hopper 16 side of the waste material dryer 14.
[0029]
【The invention's effect】
As described above, according to the asphalt composite material manufacturing apparatus of the present invention, the new material dryer and the waste material dryer are provided together, the new material dryer is provided with a combustion chamber, and a part of the hot air generated in the combustion chamber is obtained. A new channel opening / closing damper is provided to supply exhaust gas to the waste material dryer and return the exhaust gas that has passed through the waste material dryer to the combustion chamber, while preventing hot air derived from the combustion chamber from being led to the new material dryer side. It is arranged in the hot air introduction duct at the entrance of the material dryer, and the exhaust gas derived from the waste material dryer can also be led to the bag filter side by bypassing the combustion chamber by the bypass duct, so new aggregate and waste material In addition, the exhaust gas can be deodorized while simultaneously heating and the waste material can be regenerated by heating alone without burning the filter cloth of the bag filter.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view showing an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... New material dryer 3 ... Burner 5 ... Combustion chamber 7 ... New aggregate supply means 9 ... Exhaust flue 11 ... Bag filter 14 ... Waste material dryer 20 ... Hot air derivation duct 21 ... Exhaust duct 23 ... Exhaust machine 24 ... For air volume adjustment Damper 25 ... circulation duct 26 ... air volume adjustment damper 27 ... bypass duct 28 ... hot air introduction duct 29 ... flow path opening / closing damper

Claims (1)

A new material dryer that heats new aggregates and a waste material dryer that heats waste materials are provided side by side, and a burner for heating new materials is provided at one end of the new material dryer through a combustion chamber of an appropriate length . The hot air introduction duct for sending hot air to the new material dryer is provided with a channel opening / closing damper for controlling the opening and closing of the hot air flow channel, and a new aggregate supply means is provided at the other end of the new material dryer, while the downstream side of the combustion chamber A hot air outlet duct, and the other end of the hot air outlet duct is connected to the waste material supply side of one end of the waste dryer, and an exhaust duct connected to the other end of the waste dryer is connected to the combustion chamber of the new material dryer. on the upstream side through the exhauster and the air volume adjusting dampers connected, further a bypass duct is provided an exhaust duct of the waste material dryer branches than short of the air volume adjusting damper, the flow path of the end of the bypass duct Asphalt mixture manufacturing device characterized in that it has consolidated in the downstream flow path of an exhaust gas from the closing damper.

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