JP4958652B2 - Asphalt compound production equipment - Google Patents

Description

  The present invention provides a recycle dryer, a virgin dryer, and a deodorizing furnace that burns odor components in the exhaust gas of the recycle dryer, and supplies the virgin dryer with the high-temperature exhaust gas from the deodorization furnace to recover the heat of the high-temperature exhaust gas. Regarding equipment.

A recycle dryer that heats asphalt pavement waste material (hereinafter referred to as “waste material”) and a virgin material, that is, a virgin dryer that heats new aggregates, are installed in the asphalt composite material manufacturing plant. When waste materials are heated by the recycle dryer, malodorous exhaust gas may be generated depending on the heating conditions. A deodorizing furnace is installed for this malodor treatment, and the malodorous component in the exhaust gas is burned at around 800 ° C. to deodorize. Is done. At this time, since the exhaust gas discharged from the deodorizing furnace is high temperature and is released into the atmosphere, it causes an economic loss. It has been proposed to recover the retained heat of the exhaust gas (Patent Document 1).
JP-A-8-1000040

  By the way, if the entire amount of the high-temperature exhaust gas discharged from the deodorizing furnace is supplied to the virgin dryer, depending on the operating condition of the virgin dryer, there is a possibility that the exhaust fan may exceed the exhaust gas treatment capacity and blow out from the gap of the virgin dryer. In addition, if the amount of high-temperature exhaust gas supplied from the deodorizing furnace to the virgin dryer is appropriately determined by adjusting the opening degree of the air flow adjustment open / close damper, it can be supplied to the virgin dryer without blowing out. If the amount of the high-temperature exhaust gas is fixed at a constant amount, the optimum amount of the high-temperature exhaust gas is not supplied to the virgin dryer, and the heat recovery rate cannot be maximized.

  In view of the above points, the present invention makes it possible to automatically supply an appropriate amount of high-temperature exhaust gas from the deodorization furnace to the virgin dryer while preventing the operation of the virgin dryer, and collects as much heat as possible from the deodorization furnace exhaust gas to save energy. It is an object of the present invention to provide an asphalt composite material production facility designed to be designed.

  In order to solve the above-mentioned problem, an asphalt composite material manufacturing facility according to claim 1 is provided with a recycle dryer, a virgin drier, and a deodorization furnace that burns odor components in exhaust gas of the recycle dryer. Static pressure to detect static pressure in the virgin dryer in an asphalt mixture manufacturing facility that branches the exhaust duct and connects the branch duct to the virgin dryer to supply a part of the high-temperature exhaust gas from the deodorization furnace to the virgin dryer. A sensor, a main opening / closing damper for adjusting the air flow disposed downstream of the exhaust duct of the virgin dryer, and the virgin dryer by adjusting the opening of the main opening / closing damper so that the detection value of the static pressure sensor maintains a predetermined value. A static pressure / damper opening controller that controls the exhaust gas without excess or deficiency, and a bar that passes through a branch duct downstream of the deodorization furnace. And closing the damper for airflow adjustment of the hot exhaust gases flowing through the Ndoraiya, is characterized in that the opening degree of the opening and closing damper and a damper opening controller for controlling, based on the opening signal of the main switching damper.

  The asphalt composite material manufacturing facility according to claim 2 includes a recycle dryer, a virgin drier, and a deodorization furnace that burns odor components in the exhaust gas of the recycle dryer, and the exhaust duct of the deodorization furnace is branched to In an asphalt mixture manufacturing facility where a branch duct is connected to a virgin dryer and a part of the high-temperature exhaust gas from the deodorizing furnace is supplied to the virgin dryer, a static pressure sensor for detecting the static pressure in the virgin dryer and the exhaust of the virgin dryer Exhaust fan having a rotation speed adjusting means disposed downstream of the duct, and adjusting the rotation speed of the exhaust fan so that the detection value of the static pressure sensor maintains a predetermined value, the exhaust gas of the virgin dryer is substantially not excessive or insufficient High pressure exhaust that passes through the branch duct downstream of the deodorization furnace and flows into the virgin dryer. Graphics and closing the damper for airflow adjustment, is characterized in that the opening degree of the opening and closing damper and a damper opening controller for controlling, based on the speed signal of the exhaust fan.

  As described above, according to the asphalt composite material manufacturing facility of the first aspect of the present invention, the main opening and closing is performed so that the static pressure in the virgin dryer is detected by the static pressure sensor and the detected value is maintained at a predetermined value. A static pressure / damper opening controller that adjusts the opening of the damper to control the exhaust gas of the virgin dryer with almost no excess and deficiency, and the high temperature that flows from the deodorization furnace to the virgin dryer based on the opening signal of the main open / close damper With a damper opening controller that controls the opening of the open / close damper for adjusting the amount of exhaust gas, the main open / close damper of the virgin dryer can be used to draw and exhaust the exhaust gas according to the operating conditions of the virgin dryer, with almost no excess or shortage. The optimum amount of deodorizing furnace exhaust gas can be automatically supplied to the virgin dryer while checking the degree of opening of the virgin dryer, that is, the margin of the exhaust gas treatment amount of the virgin dryer. Attained efficiently energy saving can as much as possible recover heat retained in no deodorizing furnace exhaust gas to cause trouble in the operation.

  According to the asphalt mixture manufacturing facility of claim 2, the rotational pressure of the exhaust fan is adjusted so that the static pressure in the virgin dryer is detected by a static pressure sensor and the detected value is maintained at a predetermined value. A static pressure / rotation speed controller that controls the exhaust of the virgin dryer exhaust gas with almost no excess and deficiency, and an open / close damper for adjusting the amount of high-temperature exhaust gas flowing from the deodorizer to the virgin dryer based on the exhaust fan rotation speed signal. A damper opening controller that controls the degree of exhaust, so that the exhaust fan can be sucked and exhausted according to the operating conditions of the virgin dryer, while the exhaust fan rotation speed, that is, the virgin dryer exhaust gas processing capacity The optimal amount of deodorizing furnace exhaust gas can be automatically supplied to the virgin dryer while checking the degree, and the retained heat of the deodorizing furnace exhaust gas can be maintained without causing trouble in the operation of the virgin dryer. Efficient energy-saving can be achieved and can force many recovered.

  The asphalt composite material production facility of the present invention comprises a recycle dryer, a virgin dryer, and a deodorization furnace that burns odorous components in the exhaust gas of the recycle dryer, and branches the exhaust duct of the deodorization furnace. The duct is connected to a virgin dryer so that a part of the high temperature exhaust gas from the deodorizing furnace is supplied to the virgin dryer. In addition, a static pressure sensor for detecting the static pressure in the virgin dryer and a main opening / closing damper for adjusting the air volume downstream of the exhaust duct of the virgin dryer are provided, and the detection value of the static pressure sensor maintains a predetermined value. A static pressure / damper opening controller is provided for adjusting the opening of the main opening / closing damper to control the exhaust gas of the virgin dryer without substantial excess or deficiency. Furthermore, an opening / closing damper is provided for adjusting the air volume of the high-temperature exhaust gas flowing through the branch duct downstream of the deodorizing furnace and flowing to the virgin dryer, and the opening degree of the opening / closing damper is controlled based on the opening degree signal of the main opening / closing damper. A damper opening controller is provided.

  In the virgin dryer, the static pressure / damper opening controller controls the opening of the main open / close damper while the static pressure (internal pressure) on the burner side of the virgin dryer is always about −30 to −50 Pa so as to suck in a little air. By controlling the degree and exhausting the exhaust gas with almost no excess or deficiency even if the operating condition changes, the system is operated so as not to blow out from the gap between the dryers and to suck in as much excess air as possible.

  Next, when the recycle dryer is operated, the exhaust gas containing the odor component generated in the recycle dryer is led to the deodorization furnace, and the odor component in the exhaust gas is burned at around 800 ° C. and deodorized. A part of the high-temperature exhaust gas discharged from the deodorization furnace is supplied to the virgin dryer via the branch duct, but the adjustment of the deodorization furnace exhaust gas amount supplied to the virgin dryer is for air volume adjustment provided in the branch duct. The opening / closing damper for adjusting the air volume is controlled based on the opening signal of the main opening / closing damper downstream of the virgin dryer.

  The opening degree adjustment of the opening / closing damper for adjusting the air volume arranged in the branch duct is, for example, 30% (5 minutes) → 50% (5 minutes) → 80% (5 minutes) from the start of operation. And open sequentially. At this time, the opening degree of the main opening / closing damper of the virgin dryer is sequentially detected at a certain timing, and when the opening degree exceeds 80%, the opening / closing damper is set to 5 so as not to exceed the exhaust gas treatment capacity of the virgin dryer. % Close. When the opening degree of the main opening / closing damper is 50% or less, the opening / closing damper is opened 5% because the exhaust gas treatment capacity of the virgin dryer is sufficient. This control is repeated during operation.

  Thus, if an appropriate amount of deodorizing furnace exhaust gas is supplied to the virgin dryer while checking the degree of opening of the main open / close damper of the virgin dryer, that is, the margin of the exhaust gas treatment amount of the virgin dryer, the operation of the virgin dryer will be hindered. The retained heat of the deodorizing furnace exhaust gas can be recovered as much as possible by automatic control without generating it.

  Further, as another embodiment, an exhaust fan having an inverter as a rotation speed adjusting means is provided downstream of the exhaust duct of the virgin dryer, and the exhaust fan is rotated so that the detection value of the static pressure sensor maintains a predetermined value. It is equipped with a static pressure / rotation speed controller that controls the exhaust of exhaust gas from the virgin dryer by adjusting the number of the exhaust gas without substantial excess or deficiency. Furthermore, a damper opening controller for controlling the opening degree of the open / close damper disposed in the branch duct downstream of the deodorizing furnace based on the rotational speed signal of the exhaust fan is provided.

  Similarly to the above, in the virgin dryer, the rotational speed of the exhaust fan is inverter-controlled by the static pressure / rotation speed controller so that the static pressure in the virgin dryer is about −30 to −50 Pa. Next, the recycle dryer is operated, and the high-temperature exhaust gas from the deodorizing furnace is supplied to the virgin dryer via the branch duct. The supply amount control is based on the opening / closing damper of the branch duct based on the rotational speed signal of the exhaust fan. This is done by controlling the degree.

  As described above, the opening degree of the opening and closing damper of the branch duct is opened from 30% (5 minutes) → 50% (5 minutes) → 80% (5 minutes) in order from the start of operation. However, for example, it opens greatly as 80% from the beginning. Then, the rotation speed of the exhaust fan of the virgin dryer is sequentially detected at a certain timing, and if the rotation speed of the exhaust fan exceeds 80% of the reference rotation speed, the exhaust gas treatment capacity of the virgin dryer will not be exceeded. Close the open / close damper 5%. Further, when the rotational speed of the exhaust fan becomes 50% or less of the reference rotational speed, the open / close damper is opened by 5% because the exhaust gas treatment capacity of the virgin dryer is sufficient. This control is repeated during operation.

  In this way, if an appropriate amount of deodorizing furnace exhaust gas is supplied to the virgin dryer while checking the rotational speed of the exhaust fan of the virgin dryer, that is, the margin of the exhaust gas treatment amount of the virgin dryer, it is automatically performed without causing any trouble in the operation of the virgin dryer. Control can recover as much heat as possible from the deodorizing furnace exhaust gas.

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

  FIG. 1 is a schematic configuration diagram showing an asphalt composite material manufacturing facility according to the present invention, which includes a recycle dryer 1 for heating a recycle material and a virgin dryer 2 for heating a virgin material.

  The recycle dryer 1 includes a burner 3, and a dust collector 5, an exhaust fan 6 that sucks and exhausts exhaust gas, a heat exchanger 7, and an odor component in the exhaust gas burns at around 800 ° C. downstream of the exhaust duct 4. A deodorizing furnace 8 for deodorizing is provided. Reference numeral 9 denotes a heat exchanger for raising the temperature of combustion air in the burner 10 of the deodorizing furnace 8. The exhaust duct 4 downstream of the deodorizing furnace 8 is branched, and the branch duct 11 is connected to the virgin dryer 2. An air flow adjustment opening / closing damper 12 is disposed in the branch duct 11, and an air flow adjustment opening / closing damper 13 controlled in conjunction with the opening / closing damper 12 is disposed downstream of the branch portion of the exhaust duct 4.

  The virgin dryer 2 includes a burner 14 whose combustion amount is controlled based on the temperature of the heated virgin material, and a dust collector 16, a main opening / closing damper 17 for adjusting the air volume, and an exhaust fan 18 are disposed downstream of the exhaust duct 15. ing. Further, a static pressure sensor 19 for measuring the static pressure in the virgin dryer 2 on the burner 14 side is provided, and the main opening / closing damper 17 is opened so that the detection signal of the static pressure sensor 19 maintains a set value. A static pressure / damper opening controller 20 for controlling the degree is provided. In the static pressure / damper opening controller 20, the static pressure setting value in the virgin dryer 2 is set to about −30 to −50 Pa, and the air volume is controlled while sucking in a little air, so that the air gap is controlled. In addition to avoiding blowout, unnecessary air suction is minimized.

  Also, a damper opening controller 21 is provided for adjusting the opening of the open / close dampers 12 and 13 based on the opening of the main open / close damper 17. The damper opening controller 21 operates the virgin dryer 2 by controlling the opening / closing dampers 12 and 13 while checking the opening degree of the main opening / closing damper 17, that is, the margin of the exhaust gas treatment amount of the virgin dryer 2. The virgin dryer 2 is supplied with an appropriate amount of deodorizing furnace exhaust gas that does not hinder the operation. It is preferable to adjust the air volume so that the opening degree of the main opening / closing damper 17 is maintained close to 80%, for example, with a slight margin. Further, the open / close dampers 12 and 13 control the deodorizing furnace exhaust gas supplied to the virgin dryer 2 by interlocking control so that the open / close damper 13 is closed when the open / close damper 12 is opened and the open / close damper 13 is opened when the open / close damper 12 is closed. Improving sex.

  Various methods of controlling the opening / closing damper 12 by the damper opening controller 21 can be considered. For example, the opening degree of the opening / closing damper 12 is changed from 30% (5 minutes) → 50% (5 minutes) → 80 from the start of operation. % (5 minutes). At this time, the opening degree of the main opening / closing damper 17 of the virgin dryer 2 is sequentially detected at a certain timing, and when the opening degree of the main opening / closing damper 17 exceeds 80%, the opening / closing damper 12 is closed by 5%. Further, when the opening degree of the main opening / closing damper 17 becomes 50% or less, the opening / closing damper 12 is controlled to be opened by 5% so that an appropriate amount of deodorizing furnace exhaust gas is supplied to the virgin dryer 2.

  In addition, the opening / closing damper 12 is opened as much as 80% from the start of operation, and thereafter, when the opening degree of the main opening / closing damper 17 exceeds 80%, the opening / closing damper is closed 5%. A control method is also conceivable in which the opening / closing damper 12 is opened by 5% when the opening degree of the main opening / closing damper 17 becomes 50% or less.

  Next, the case where the asphalt mixture is produced by operating the recycle dryer 1 and the virgin dryer 2 simultaneously in the asphalt mixture production facility will be described. When the recycle dryer 1 and the virgin dryer 2 are operated at the same time, the amount of virgin material supplied to the virgin dryer 2 is reduced by the amount of the recycle material. Comes out. Therefore, the high-temperature exhaust gas that has passed through the deodorizing furnace 8 downstream of the recycle dryer 1 is diverted to the branch duct 11 side and supplied to the virgin dryer 2.

  At this time, for example, the above-described method for controlling the opening degree of the opening / closing damper 12 by the damper opening degree controller 21 is adopted, and the opening degree of the opening / closing damper 12 is opened by 30% (5 minutes) from the start of operation. Is supplied to the virgin dryer 2 via the branch duct 11. Since the exhaust gas from the deodorizing furnace is supplied to the virgin dryer 2 at a positive pressure, the detection value measured by the static pressure sensor 19 becomes a positive pressure from the static pressure setting value (about -30 to -50 Pa). / Damper opening controller 20 controls the opening so that the opening degree of the main opening / closing damper 17 becomes the static pressure set value, and the amount of gas supplied to the virgin dryer 2 is sucked and exhausted with almost no excess or shortage. The optimum operation state is maintained so that there is no blowing from the gap between the virgin dryers 2.

  Subsequently, when 5 minutes have elapsed, the opening degree of the open / close damper 12 is opened by 50% (5 minutes). Then, the static pressure / damper opening controller 20 controls the opening so that the opening degree of the main opening / closing damper 17 is opened to the static pressure set value. Further, when the opening degree of the opening / closing damper 12 is opened by 80% (5 minutes) after 5 minutes, the static pressure / damper opening degree controller 20 further opens the opening degree of the main opening / closing damper 17 to the static pressure set value. The opening degree is controlled as follows. In the process of opening control, the opening degree of the main opening / closing damper 17 is sequentially detected at a certain timing, and when the opening degree of the main opening / closing damper 17 exceeds 80%, the opening / closing damper 12 is closed by 5%, When the opening degree of the main open / close damper 17 becomes 50% or less, the deodorizing furnace exhaust gas supplied to the virgin dryer 2 is adjusted as appropriate, for example, the open / close damper 12 is opened 5%, and an appropriate amount of deodorizing furnace exhaust gas is supplied.

  In this way, since an appropriate amount of deodorizing furnace exhaust gas is supplied to the virgin dryer 2 while checking the degree of opening of the main opening / closing damper 17 of the virgin dryer 2, that is, the margin of the exhaust gas treatment amount of the virgin dryer 2, the operation of the virgin dryer 2 is performed. As much as possible, the heat retained in the deodorizing furnace exhaust gas can be recovered without causing any problems.

  FIG. 2 is a diagram for explaining another embodiment. 2, the same reference numerals as those in FIG. 1 denote the same components, and the description thereof is omitted.

  Reference numeral 22 denotes an exhaust fan having an inverter which is a rotational speed adjusting means disposed downstream of the exhaust duct 15 of the virgin dryer 2, and the exhaust fan 22 rotates so that the detection value of the static pressure sensor 19 maintains a set value. A static pressure / rotation speed controller 23 for adjusting the number and controlling the exhaust gas of the virgin dryer 2 without substantial excess or deficiency is provided. In addition, a damper opening controller 24 that controls the opening degree of the open / close damper 12 disposed in the branch duct 11 downstream of the deodorizing furnace 8 based on the rotational speed signal of the exhaust fan 22 is provided.

  Next, the case where the recycle dryer 1 and the virgin dryer 2 are simultaneously operated in the asphalt composite material manufacturing facility will be described. Similarly to the above, in the virgin dryer 2, the rotational speed of the exhaust fan 22 is inverter-controlled by the static pressure / rotation speed controller 23 so that the static pressure in the virgin dryer 2 is about -30 to -50 Pa. Subsequently, when the recycle dryer is operated, the high-temperature exhaust gas from the deodorizing furnace 8 is supplied to the virgin dryer 2 via the branch duct 11, and the supply amount control is performed based on the rotation speed signal of the exhaust fan 22. This is done by controlling the opening of the open / close damper 12.

  As described above, the opening degree of the opening and closing damper of the branch duct is sequentially opened from the start of operation, from 30% (5 minutes) to 50% (5 minutes) to 80% (5 minutes). For example, it may be opened as large as 80% from the beginning. Then, the rotational speed of the exhaust fan 22 is sequentially detected at fixed timings, and when it exceeds 80% of the reference rotational speed, the open / close damper 12 is closed by 5%. Further, when the rotational speed of the exhaust fan 22 becomes 50% or less of the reference rotational speed, the amount of exhaust gas supplied to the virgin dryer 2 is adjusted as appropriate by opening the open / close damper to 5%, and as much hot exhaust gas as possible is supplied to the virgin dryer 2. Control to supply.

  In this way, if an appropriate amount of deodorizing furnace exhaust gas is supplied to the virgin dryer 2 by checking the rotational speed of the exhaust fan 22 of the virgin dryer 2, that is, the margin of the exhaust gas treatment amount of the virgin dryer 2, the operation of the virgin dryer 2 is hindered. Can recover as much heat as possible from the deodorizing furnace exhaust gas

  As described in the above embodiment, various opening degree control methods of the opening / closing damper 12 by the damper opening degree controllers 21 and 24 are conceivable, but the point is to check the margin of the exhaust gas treatment amount of the virgin dryer 2. However, an appropriate amount of deodorizing furnace exhaust gas that does not hinder the operation is supplied to the virgin dryer 2, and the opening degree of the main open / close damper 17 of the virgin dryer and the rotation speed of the exhaust fan 22 of the inverter control are always set to 80%, for example. It goes without saying that various changes can be made without departing from the gist of the present invention, such as opening / closing control of the opening / closing damper 12 so as to maintain the degree.

It is a schematic block diagram which shows one Example of the asphalt compound material manufacturing equipment which concerns on this invention. It is a schematic block diagram which shows the other Example of the asphalt compound material manufacturing equipment which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Recycle dryer 2 ... Virgin dryer 4 ... Exhaust duct 8 ... Deodorizing furnace 11 ... Branch duct 12, 13 ... Opening / closing damper 15 ... Exhaust duct 16 ... Dust collector 17 ... Main opening / closing damper 19 ... Static pressure sensor 20 ... Static pressure / damper opening Degree controller 21 ... Damper opening controller 22 ... Exhaust fan having rotation speed adjusting means 23 ... Static pressure / rotation speed controller 24 ... Damper opening controller

Claims (2)

  A recycle dryer, a virgin dryer, and a deodorization furnace that burns odorous components in the exhaust gas of the recycle dryer, branching the exhaust duct of the deodorization furnace and connecting the branch duct to the virgin dryer, the high temperature exhaust gas of the deodorization furnace In an asphalt mixture manufacturing facility configured to supply a part of the virgin dryer to the virgin dryer, a static pressure sensor for detecting the static pressure in the virgin dryer, and a main opening / closing damper for adjusting the air flow disposed downstream of the exhaust duct of the virgin dryer, A static pressure / damper opening controller that adjusts the opening of the main open / close damper so that the detected value of the static pressure sensor maintains a predetermined value, and controls the exhaust gas of the virgin dryer without substantial excess or deficiency, Open / close damper for adjusting the air volume of high-temperature exhaust gas flowing through the branch duct downstream of the deodorizing furnace and flowing to the virgin dryer, and the open / close damper Asphalt mixture manufacturing equipment is characterized in that a damper opening controller for controlling on the basis of opening degree opening signal of the main switching damper.   A recycle dryer, a virgin dryer, and a deodorization furnace that burns odorous components in the exhaust gas of the recycle dryer, branching the exhaust duct of the deodorization furnace and connecting the branch duct to the virgin dryer, the high temperature exhaust gas of the deodorization furnace Exhaust fan having a static pressure sensor for detecting the static pressure in the virgin dryer and a rotation speed adjusting means disposed downstream of the exhaust duct of the virgin dryer in an asphalt mixture manufacturing facility configured to supply a part of the virgin dryer to the virgin dryer And a static pressure / rotation speed controller that controls the exhaust gas of the virgin dryer so that the exhaust gas of the virgin dryer is controlled substantially and sufficiently so that the detection value of the static pressure sensor maintains a predetermined value, and deodorization An open / close damper for adjusting the air volume of the high-temperature exhaust gas flowing through the branch duct downstream of the furnace and flowing to the virgin dryer, and opening / closing of the open / close damper Asphalt mixture manufacturing equipment is characterized in that a damper opening controller for controlling, based on the speed signal of the exhaust fan.

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