JP4677255B2 - Asphalt recycle plant - Google Patents

Description

  The present invention relates to an asphalt recycle plant that heats and recycles asphalt pavement waste material generated by road construction and the like.

When waste material is heated in an asphalt recycle plant dryer that heats and recycles asphalt pavement waste material (hereinafter referred to as “waste material”), the asphalt component is vaporized and led to the exhaust flue downstream of the dryer, but the exhaust gas temperature is around 200 ° C. As a result, the vaporized asphalt content in the exhaust gas may be further reduced in temperature and condensed near the inner wall of the flue, and may adhere to the inner wall of the exhaust flue. And, if the exhaust gas becomes temporarily high temperature, it may ignite, and if a fire is flying, it may ignite and cause a fire. As a means to prevent this asphalt from adhering to the exhaust flue, it is also possible to mix stone powder in the exhaust flue and coat the asphalt with stone powder so that it does not adhere to the exhaust flue. (See Patent Document 1).
JP 60-230407 A

  However, as mentioned above, there is a problem that a large amount of stone powder is required to make the asphalt content non-sticky with stone powder, and maintenance is troublesome, and the flue for asphalt is a little easier. There has been a demand for the appearance of a method capable of preventing adhesion.

  This invention makes it a subject to provide the asphalt recycle plant which prevented generation | occurrence | production of a fire by preventing the vaporized asphalt part in waste gas from adhering in a flue in view of said point.

In order to solve the above problems, the present invention provides an asphalt recycle plant according to claim 1, wherein a deodorizing furnace for thermally decomposing odorous components in exhaust gas is disposed downstream of an exhaust flue of a dryer for heating waste materials. In an asphalt recycle plant in which high temperature gas derived from the deodorizing furnace is supplied to the dryer via a high temperature gas supply duct to heat the waste material , the air volume is adjusted in a branch duct formed by branching the high temperature gas supply duct the use damper is interposed to connect the ends of the branch duct to the exhaust duct of the dryer outlet,-out guide a portion of the hot exhaust gas to the exhaust flue of the dryer outlet, joins the exhaust gas and the hot gas discharged from the dryer The exhaust gas temperature is raised so that the vaporized asphalt content in the exhaust gas does not condense .

Also, in the asphalt recycling plant according to claim 2 is arranged an exhaust gas temperature detection meter downstream of the connecting portion between the branch duct exhaust duct outlet before Kido Laiya at the exhaust gas temperature detecting thermometer the exhaust gas temperature detected by comparison with a reference temperature asphalt vaporized in the exhaust gas is set in advance not condense, a damper opening control device for performing the opening regulation control of the opening degree adjustment damper on the basis of the difference value weight It is characterized by having prepared .

According to the asphalt recycle plant according to claim 1 of the present invention, a deodorizing furnace for thermally decomposing odorous components in exhaust gas is disposed downstream of the exhaust flue of the waste material heating dryer, and a high temperature derived from the deodorizing furnace. In an asphalt recycle plant in which gas is supplied to the dryer via a high-temperature gas supply duct to heat the waste material, a branch duct formed by branching the high-temperature gas supply duct is interposed at the end of the branch duct with an air volume adjusting damper interposed therebetween. was connected to the exhaust flue of the dryer outlet,-out guide a portion of the hot exhaust gas to the exhaust flue of the dryer outlet, in the exhaust gas to increase the exhaust gas temperature by merging the exhaust gas and the hot gas discharged from the dryer since vaporized asphalt has such a temperature that does not condense, exhaust gas and can enhance the exhaust gas temperature of the exhaust flue of the dryer downstream Vaporized asphalt is less likely to condense, the occurrence of fire can be prevented by suppressing the asphalt from adhering to the exhaust flue.

According to the asphalt recycling plant according to claim 2 of the present invention, before the exhaust gas temperature detecting thermometer disposed downstream of the connecting portion of the branch duct and the exhaust duct at the outlet of Kido Laiya at the exhaust gas temperature detecting thermometer the exhaust gas temperature detected by comparison with a reference temperature asphalt vaporized in the exhaust gas is set in advance not condense, a damper opening control device for performing the opening regulation control of the opening degree adjustment damper on the basis of the difference value weight Because it is equipped , the exhaust gas temperature in the exhaust flue can be controlled and maintained at a gas temperature at which it is difficult to condense the asphalt, and the occurrence of a fire can be prevented by suppressing the attachment of the asphalt to the exhaust flue.

  In the asphalt recycle plant according to claim 1 of the present invention, a deodorizing furnace for thermally decomposing odorous components in exhaust gas is disposed downstream of the exhaust flue of the dryer for heating the waste material, and a heat source for heating the waste material of the dryer. The high temperature gas of about 750 ° C. discharged from the deodorizing furnace is supplied to the dryer through the high temperature gas supply duct. A branch duct formed by branching the hot gas supply duct is connected to an exhaust flue at the outlet of the dryer. As a result, the exhaust gas of about 200 ° C. exhausted from the dryer and the high temperature gas of about 750 ° C. are combined so that the exhaust gas of about 350 ° C. flows in the exhaust flue downstream of the dryer, and the vaporized asphalt content in the exhaust gas It becomes difficult to condense, and it can prevent the occurrence of fire by suppressing the attachment of asphalt to the exhaust flue.

  In the asphalt recycle plant according to claim 2 of the present invention, an opening adjusting damper is disposed in a branch duct for introducing a high temperature gas into the exhaust flue of the dryer, and an exhaust gas is disposed in the exhaust flue at the outlet of the dryer. A temperature detector is provided. Then, the exhaust gas temperature detected by the exhaust gas temperature detector is taken into the damper opening adjuster, compared with a reference value preset by the damper opening adjuster, and based on the difference value, the opening adjustment Perform damper opening adjustment control. As a result, the temperature of the exhaust gas in the exhaust flue is controlled so that the vaporized asphalt in the exhaust gas does not condense, and the asphalt is prevented from adhering to the exhaust flue and the occurrence of a fire can be prevented.

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

  1 in the figure is a known dryer for heating waste materials, and a cylindrical drum 2 having a large number of scraping blades (not shown) around its inner periphery is inclined on a machine base 3 in a freely rotatable manner. It is supported and rotated at a predetermined speed by a driving device (not shown). And the hot gas from the deodorizing furnace 4 mentioned later is sent in in the drum 2 via the hot gas supply duct 5, and was interposed downstream of the exhaust flue 7 connected with the discharge hopper 6 of the other end part of the drum 2. While the exhaust gas is sucked by the exhaust fan 8 and the high temperature gas flow passing through the drum 2 is maintained, the waste material discharged from the aggregate hopper (not shown) is supplied into the drum 2 via the belt conveyor 9. Heating to the desired temperature while rolling down the inside.

  A dust collector 10 that captures dust in the exhaust gas is disposed downstream of the exhaust flue 7, and a deodorization furnace 4 is disposed downstream of the dust collector 10 for burning and decomposing asphalt contained in the exhaust gas. Has been established. The exhaust gas that has passed through the deodorizing furnace 4 becomes a clean gas and is released from the chimney 11 into the atmosphere.

  The deodorizing furnace 4 is provided with a burner 12 for maintaining the furnace temperature at a predetermined value at one end, exposing the exhaust gas introduced into the furnace to a high temperature atmosphere, and burning and decomposing asphalt contained in the exhaust gas. Yes. The deodorizing furnace 4 controls the combustion amount of the burner 12 so that the temperature inside the furnace is maintained at a high temperature of, for example, approximately 750 ° C. or more so that the asphalt can be completely burned and decomposed, and the exhaust gas passes through the furnace. It is preferable to have a staying chamber 4a that takes at least 1 to 2 seconds or more to do so.

  A predetermined amount of the hot gas passing through the deodorizing furnace 4 is supplied to the dryer 1 through the hot gas supply duct 5 by controlling the degree of opening and closing of the damper 13. Further, the end of the branch duct 14 formed by branching the high temperature gas supply duct 5 is connected to the exhaust flue 7 at the outlet of the dryer 1, and a part of the high temperature gas passes through the branch duct 14 and is exhausted at the outlet of the dryer 1. It is led into the road 7 so as to merge with the exhaust gas of the dryer 1.

  An air volume adjusting damper 15 is disposed in the branch duct 14, and an exhaust gas temperature detector 16 is provided in the exhaust flue 7 near the outlet of the dryer 1. Further, a damper opening adjuster 17 for taking in the detection value of the exhaust gas temperature detector 16 is arranged, and the exhaust gas detection value taken in by the damper opening adjuster 17 is compared with a preset reference value, and the difference therebetween The opening adjustment control of the air volume adjusting damper 15 is performed based on the value amount.

  Reference numerals 18 and 19 denote heat exchangers for effectively using the exhaust gas heat of the exhaust gas having a high temperature of about 750 ° C. discharged from the deodorizing furnace 4, and the heat exchanger 18 is an exhaust flue. 7 raises the temperature of the exhaust gas introduced into the deodorizing furnace 4, and the heat exchanger 19 preheats the combustion air supplied from the combustion air supply fan 20 to the burner 12 of the deodorizing furnace 4. .

  Thus, when heating the waste material, first, the waste material is supplied to the dryer 1 via the belt conveyor 9, while the high temperature gas is supplied from the deodorizing furnace 4 to the dryer 1 via the high temperature gas supply duct 5. Heat to predetermined temperature. At this time, the supply amount of the high-temperature gas is controlled by adjusting the opening / closing degree of the damper 13 so that the temperature of the heated waste material discharged from the drum 2 or the exhaust gas temperature becomes a preset value.

  Further, the opening degree of the air volume adjusting damper 15 is appropriately adjusted, and a high temperature gas of about 750 ° C. discharged from the deodorizing furnace 4 is led to the exhaust flue 7 at the outlet of the dryer 1 through the branch duct 14. Combine with the exhaust gas at about 200 ° C. At this time, in the case where the damper opening adjuster 17 is provided, the exhaust gas temperature in the exhaust flue 7 detected by the gas temperature detector 16 is taken into the damper opening adjuster 17, and a preset reference value, for example, 350 ° C. And the opening degree of the air volume adjusting damper 15 is controlled based on the difference value, and the temperature in the exhaust flue 7 downstream of the dryer 1 is maintained at about 350 ° C.

  Then, the exhaust gas derived from the dryer 1 is guided to the dust collector 10, and the dust content in the exhaust gas is captured by the dust collector 10, while the exhaust gas that has passed through the dust collector 10 is guided to the deodorizing furnace 4 and about 750 ° C. in the furnace. The asphalt remaining in the exhaust gas is completely burned and decomposed by exposure to a high temperature atmosphere. The high-temperature exhaust gas discharged from the deodorizing furnace 4 is lowered to about 400 ° C. through the heat exchangers 18 and 19 and discharged from the chimney 11 to the atmosphere.

  In this way, by supplying the high-temperature gas discharged from the deodorizing furnace 4 into the exhaust flue 7 downstream of the dryer 1 through the branch duct 14, the exhaust gas temperature in the exhaust flue 7 is set to a high temperature of about 350 ° C. As a result, the vaporized asphalt content in the exhaust gas becomes difficult to condense, and it is possible to prevent the occurrence of fire by suppressing the asphalt content in the exhaust flue 7.

It is a schematic explanatory drawing which shows one Example of the asphalt recycle plant which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Dryer 4 ... Deodorizing furnace 5 ... High temperature gas supply duct 7 ... Exhaust flue 8 ... Dust collector 10 ... Dust collector 12 ... Burner 14 ... Branch duct 15 ... Damper for air volume adjustment 16 ... Exhaust gas temperature detector 17 ... Damper opening degree adjustment 18, 19 ... heat exchanger

Claims (2)

A deodorizing furnace for thermally decomposing odor components in the exhaust gas is disposed downstream of the exhaust flue of the dryer for heating the waste material, and the high-temperature gas derived from the deodorizing furnace is supplied to the dryer via the high-temperature gas supply duct. In an asphalt recycle plant for heating waste materials, an air flow adjusting damper is interposed in a branch duct formed by branching the high temperature gas supply duct, and the end of the branch duct is connected to an exhaust flue at the outlet of the dryer. part of-out guide to the exhaust flue of the dryer outlet, by merging the exhaust gas and the hot gas to increase the exhaust gas temperature vaporized asphalt in the exhaust gas exhausted from the dryer was such that the temperature so as not to condense An asphalt recycle plant characterized by that. It arranged an exhaust gas temperature detection meter downstream of the connecting portion between the branch duct exhaust duct outlet before Kido Laiya, asphalt of the exhaust gas temperature vaporized in the exhaust gas detected by the exhaust gas temperature detecting thermometer does not condense 2. The asphalt recycle plant according to claim 1, further comprising a damper opening adjuster that performs opening adjustment control of the opening adjusting damper based on a difference value amount compared with a preset reference temperature. .

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