JP2005290685A - Deodorizing drier for use in recycle plant of paving aggregate waste - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deodorizing drier for use in deodorization of exhaust gas exhausted from a heating drum for heating and regenerating paving aggregate waste in a recycle plant of the paving aggregate waste, by using paving aggregate, wherein the deodorizing drier carries out continuous deodorization over a long period of time and at the same time carries out heating and drying of the paving aggregate. <P>SOLUTION: The deodorizing drier is formed of a storage hopper 4 arranged in some midpoint of an exhaust channel 3 of the exhaust gas from the heating drum 1, for allowing the exhaust gas to pass therethrough, a paving aggregate feeder 10 for feeding the paving aggregate to the storage hopper 4, a paving aggregate discharging device 11 for always discharging the paving aggregate in a predetermined amount from the storage hopper 4, and a control mechanism 5 for controlling the feeding amount of the paving aggregate by the paving aggregate feeder 10 such that the storage hopper 4 stores therein a constant amount of the paving aggregate. The deodorizing drier carries out deodorization of the exhaust gas by the paving aggregate in the storage hopper 4 and carries out heating and drying of the paving aggregate in the storage hopper 4 by waste heat of the exhaust gas. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a deodorization dryer that deodorizes exhaust gas generated in a pavement waste aggregate recycling plant and heats and drys the pavement aggregate using waste heat of the exhaust gas.

  In the pavement waste aggregate recycling plant, the pavement waste aggregate is heated and regenerated with a heating drum. However, since a large amount of asphalt is attached to the pavement waste aggregate, The asphalt component volatilizes and flows out downstream as odorous gas or dust. Therefore, conventionally, a deodorizer is installed downstream of the heating drum.

  As this deodorizer, Patent Document 1 discloses a crushed stone filter configured to spread crushed stone (paved new aggregate) to a predetermined thickness and capture asphalt and dust in exhaust gas from a heating drum.

However, in the crushed stone filter disclosed in Patent Document 1, since the crushed stone is a fixed layer that is statically spread, the asphalt component adheres and clogging occurs after about 3 to 7 days. So it was necessary to replace crushed stones regularly. Moreover, although the crushed stone immediately after replacement | exchange is heated with the waste heat of waste gas, since it is left after replacement | exchange, the temperature will fall to room temperature and will adsorb | suck the humidity in air. Therefore, when using the crushed stone after replacement as a raw material for the asphalt mixture, it is necessary to send it to the drying process again in order to remove the moisture, and the waste heat of the exhaust gas has not been effectively used.
JP-A-9-313850

  The problem to be solved by the present invention is that the exhaust gas discharged from the heating drum for heating and regenerating the pavement waste aggregate in the pavement waste aggregate recycling plant is deodorized using the pavement aggregate continuously over a long period of time. Another object of the present invention is to provide a deodorization dryer capable of performing deodorization and simultaneously heating and drying a paving aggregate.

  The present invention relates to a paving aggregate comprising deodorizing exhaust gas discharged from a heating drum for heating and regenerating paving waste aggregate, and using the waste heat of the exhaust gas and comprising paving waste aggregate and / or new paving aggregate. A deodorizing dryer in a pavement waste aggregate recycling plant that heats and drys a storage hopper that is provided in the middle of the exhaust gas discharge path and that passes the exhaust gas, and a pavement aggregate that supplies the pavement aggregate to the storage hopper Pavement by the pavement aggregate discharging device for constantly discharging a predetermined amount of pavement aggregate from the storage hopper, and the pavement aggregate supply device so that the storage amount of the pavement aggregate in the storage hopper is constant A control mechanism for controlling the amount of aggregate supplied, and deodorizing the exhaust gas by the pavement aggregate in the storage hopper, and pavement bone in the storage hopper by waste heat of the exhaust gas The is obtained so as to heat drying.

  That is, the present invention is characterized in that the paving aggregate in the storage hopper for deodorizing the exhaust gas is a moving layer, and the storage amount is kept constant. The exhaust gas can be deodorized continuously. In addition, since heat is continuously exchanged between the high temperature exhaust gas and the newly supplied normal temperature pavement aggregate in the storage hopper, the pavement aggregate is also heated and dried simultaneously with the deodorization of the exhaust gas, Heat dried pavement aggregate can be continuously discharged from the storage hopper.

  And this invention can be equipped with the pavement aggregate injection | throwing-in apparatus which inputs the pavement aggregate after the heat drying discharged | emitted from the storage hopper into a heating drum. Thereby, the paving aggregate after heat drying can be put into the heating drum as it is. Further, since the paving aggregate is preheated, the energy consumption in the heating drum can be reduced. Thus, in the present invention, the waste heat of the exhaust gas from the heating drum can be effectively used to achieve energy saving.

  In the present invention, as the paving aggregate to be put into the storage hopper, the exhaust gas uniformly flows in the storage hopper, and in order to efficiently capture the odor component (asphalt content) in the exhaust gas, No. 6 crushed stone or No. 7 It is preferable to use crushed stone, that is, having a diameter of 2.5 to 13 mm.

  In the present invention, the moving layer of the paving aggregate is formed in the storage hopper so that the exhaust gas is deodorized. Therefore, there is no need to artificially replace the paving aggregate, and it is continuously performed over a long period of time. The exhaust gas can be deodorized.

  Since the pavement aggregate discharged from the storage hopper is heated and dried by the waste heat of the exhaust gas, if the pavement aggregate is put into the heating drum as it is, the drying process can be omitted and the heating drum Energy consumption can be reduced.

  Embodiments of the present invention will be described below based on examples shown in the drawings.

  FIG. 1 is a configuration diagram of a pavement waste aggregate recycling plant to which the deodorizing dryer of the present invention is applied.

  The pavement waste aggregate recycling plant shown in FIG. 1 is provided in the middle of a heating drum 1 that heats and regenerates pavement waste aggregate, a cyclone 2 that removes dust in the exhaust gas from the heating drum 1, and an exhaust gas discharge path 3. The storage hopper 4 that allows the exhaust gas to pass therethrough is the main component.

  The heating drum 1 includes a dryer burner 1a as a heating source, and the pavement waste aggregate stored in the pavement waste aggregate hoppers 6a to 6c is input into the heating drum 1 by the input bell-con 8. ing. In the embodiment, the paved new aggregate stored in the paved new aggregate hoppers 7a to 7c is also fed into the heating drum 1 by the feeding bell-con 8 for heating and drying. The pavement aggregate (paved waste aggregate and pavement new aggregate) heat-treated by the heating drum 1 is discharged from the discharge port 1b and stored in the hopper 9. The paving aggregate in the hopper 9 is reused as a raw material for the asphalt mixture.

  The gas in the heating drum 1 is sucked and discharged by an exhaust fan 12 provided near the end of the exhaust gas discharge path 3, and a part of the gas is returned to the dryer burner 1a by the return fan 1c for circulation.

  In the exhaust gas discharge path 3, the exhaust gas is first guided to the cyclone 2, and dust in the exhaust gas is removed. The removed dust is discharged from the discharge port 1b and stored in the hopper 9.

  The exhaust gas leaving the cyclone 2 is then led to the storage hopper 4. In this storage hopper 4, pavement waste aggregate (equivalent to No. 6 crushed stone) stored in the pavement waste aggregate hopper 6a or pavement new aggregate (No. 6 crushed stone) stored in the pavement new aggregate hopper 7a is stored. Supplied from above by the paving aggregate conveying elevator 10 as a paving aggregate supply device. In addition, a predetermined amount of paving aggregate is always discharged from the bottom of the storage hopper 4 by a quantitative cutting machine 11 as a paving aggregate discharging device. As a result, a moving layer of paving aggregate is formed in the storage hopper 4. Further, the storage hopper 4 is provided with a level sensor 5 for detecting the upper surface level of the paved aggregate in the storage hopper 4, and the paving aggregate conveying elevator 10 based on the level detection signal from the level sensor 5. The amount of pavement aggregate supplied from is controlled so that the amount of pavement aggregate stored in the storage hopper 4 (upper surface level) is always constant. That is, the level sensor 5 constitutes a control mechanism for making the storage amount of the paved aggregate in the storage hopper 4 constant.

  In the above configuration, the exhaust gas exiting the cyclone 2 is introduced from the lower part of the storage hopper 4 and is in countercurrent contact with the moving layer of the paved aggregate in the storage hopper 4. As a result, odor components such as asphalt in the exhaust gas are captured by the paving aggregate and deodorized. At the same time, heat exchange is performed between the exhaust gas and the paved aggregate, and the paved aggregate is heated and dried.

  The heat-dried paving aggregate with asphalt is discharged from the bottom of the storage hopper 4 by the quantitative cutting machine 11 as described above, and is charged into the heating drum 1 by the charging bell-con 8 as a paving aggregate charging device. The paving aggregate with asphalt is heated and regenerated above the temperature at which the asphalt component volatilizes in the heating drum 1, but the paving aggregate discharged from the storage hopper 4 is caused by the waste heat of the exhaust gas as described above. Since it has been preheated and is directly and continuously charged into the heating drum 1 by the charging bellcon 8, the amount of energy for reheating in the heating drum 1 can be reduced.

  On the other hand, the exhaust gas discharged from the top of the storage hopper 4 is introduced into a chimney 13 with a wet dust collector, detoxified, and then discharged into the atmosphere. In addition, as shown with the dashed-dotted line in FIG. 1, it may replace with a wet dust collector and may provide the dry-type bag filter 14 in front of the exhaust fan 12. FIG.

It is a block diagram of the pavement waste aggregate recycling plant to which the deodorizing dryer of this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating drum 1a Dryer burner 1b Discharge port 1c Return fan 2 Cyclone 3 Exhaust gas discharge path 4 Storage hopper 5 Level sensor 6a-6c Pavement waste aggregate hopper 7a-7c Pavement new aggregate hopper 8 Input velcon (pavement aggregate supply device) )
9 Hopper 10 Pavement Aggregate Elevator (Pavement Aggregate Supply Device)
11 Fixed amount cutting machine (paving aggregate discharging device)
12 Ventilator 13 Chimney with wet dust collector 14 Bag filter

Claims (2)

The exhaust gas discharged from the heating drum that heats and regenerates the pavement waste aggregate is deodorized, and the waste heat of the exhaust gas is used to heat and dry the pavement aggregate composed of the pavement waste aggregate and / or the new pavement aggregate. A deodorizing dryer in a pavement waste aggregate recycling plant,
A storage hopper provided in the middle of the exhaust gas discharge path, a pavement aggregate supply device for supplying pavement aggregate to the storage hopper, and a predetermined amount of pavement aggregate is always discharged from the storage hopper. A pavement aggregate discharging device, and a control mechanism for controlling the amount of pavement aggregate supplied by the pavement aggregate supply device so that the amount of pavement aggregate stored in the storage hopper is constant,
A deodorization dryer in a pavement waste aggregate recycling plant that deodorizes the exhaust gas with the pavement aggregate in the storage hopper and heats and drys the pavement aggregate in the storage hopper with waste heat of the exhaust gas.   The deodorizing drier in the pavement waste aggregate recycling plant according to claim 1, further comprising a pavement aggregate input device that inputs the pavement aggregate discharged from the storage hopper into the heating drum.

Images