JPH04221107A - Conglutination preventing method of adhesive dust produced during regeneration of asphalt pavement scrap - Google Patents

Abstract

PURPOSE:To prevent deterioration in equipment performance due to adhesive dust, which is produced during the regeneration process of asphalt pavement scrap and discharged from a dryer, conglutinating on a flue, a dust collector and the like. CONSTITUTION:A supply pipe 15, into which stone powder is mixed as a property recovery agent for asphalt pavement scrap, is connected to a discharge gas outlet portion of the flue 4 of a dryer 1 acting as a heating device for the asphalt pavement scrap, and the end of the supply pipe 15 is arranged along the flowing direction of the discharged gas. The stone powder is then delivered into the supply pipe 15 under pressure, charged into the flue 4 and mixed in the gas flow delivered from the dryer 1 to cover the surface of the dust. The stone powder caught by a cyclone dust collector 17 and a bag filter 18, connected to the dryer 1 downstream thereof, and the dust covered with the stone powder are used without waste by restoring them into a mixer 11 and mixing them in the regenerated blened asphalt.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method for preventing the adhesion of sticky dust generated during the recycling of asphalt pavement waste materials, and relates to a method for replacing or repairing existing asphalt pavement, and also for installing equipment buried under existing asphalt pavement. This prevents sticky dust that flows out with the flow of combustion gas during the recycling process of asphalt pavement waste generated from construction work, particularly during the heating process, from adhering to the inner wall of the downstream flue.

0002

[Prior Art] A lump of asphalt pavement waste material (hereinafter referred to as "waste material") dug up during road construction is crushed by a mechanical crushing method using a crusher or the like, or by immersing the waste material in hot water or high-temperature steam and then mechanically stirring it. Using a thermal crushing method to break up bonds, the aggregate is made into granular aggregate particles with an asphalt coating on the aggregate surface, which is then fed to a dryer, which is a heating device, to soften the asphalt and restore its properties.
We are trying to recycle waste materials.

[0003] Normally, a dryer for heating waste materials consists of a rotatable, inclined cylindrical drum, and the waste materials are fed into the drum and rolled down along the inclination direction, while the burner - The waste material is heated by supplying combustion gas into the drum.

0004

[Problems to be Solved by the Invention] However, when this method is used, fine particles in the waste material become dust and flow out together with the gas flow. This dust is attached to asphalt, which is softened by heating and becomes sticky, so it adheres to the inner wall of the downstream flue, especially the curved pipe, and if this is repeated, it will block the flue. , induces a decline in the capacity and function of the device. In addition, because the outflowing dust is sticky, bag filters, which are filtration and dust collection devices using fiber filter media, cannot be used, and cleaning dust collection devices are mainly used, but compared to bag filters, The dust collection performance is also poor, and the current situation is that it cannot be said to be desirable in terms of pollution prevention.

[0005]

[Means for Solving the Problems] The present invention has been made in view of the above points, and in order to solve the above problems, waste materials are supplied to a dryer, which is a heating device for asphalt pavement waste materials, and heated and regenerated. However, in the method of using an asphalt pavement waste recycling device in which scattered dust is captured by a cyclone dust collector installed downstream of the dryer and a bag filter downstream thereof, a device connected to the dryer to discharge exhaust gas is used. A supply pipe that mixes stone powder, which is a property restoring agent for waste wood, is connected to the exhaust gas outlet near the dryer in the flue, and the tip of the supply pipe is arranged so as to face the direction in which the exhaust gas flows out. Stone powder is force-fed into the pipe and thrown into the flue so that the stone powder is mixed into the gas stream discharged from the dryer, and the stone powder and dust coated with stone powder captured by the cyclone dust collector and bag filter are mixed. To provide a method for preventing the adhesion of sticky dust generated during the recycling of asphalt pavement waste material, characterized in that the asphalt mixture is reduced to - and mixed into the recycled asphalt mixture for use.

[0006]

[Operation] In the present invention, stone powder, which is a property restoring agent for waste wood, flows out in the direction of exhaust gas outflow from the supply pipe connected to the flue of the exhaust gas outlet near the dryer. The outflow of exhaust gas from the dryer can be facilitated.

Then, by force-feeding stone powder into the supply pipe and mixing it with the gas flow, the surface of the dust accompanying the gas flow is coated with the stone powder, and the asphalt content makes the dust non-adhesive. This can prevent dust from adhering to the flue, downstream cyclone dust collector, bag filter, etc.

[0008] In addition, the stone powder and stone powder-coated dust captured by the cyclone dust collector and bag filter are reduced in a mixer and mixed into the recycled asphalt mixture for use, thereby improving the dryer's performance. This eliminates the waste of stone powder thrown in at the exhaust gas outlet.

[0009]

EXAMPLES The present invention will be explained below based on examples. FIG. 1 shows one embodiment of the present invention. Reference numeral 1 denotes a dryer which is a heating device, and is of a rotary kiln type, in which a cylindrical drum 2 having a number of scraping blades (not shown) arranged around its inner periphery is pivoted at an angle. There is. 3 is a burner installed at one end of the drum 2, which sends combustion gas into the drum 2 and sucks the combustion gas through an exhaust fan 5 installed at the end of a flue 4 connected to the other end of the drum. 2 maintains a flow of hot gas through it.

In addition, feeders 7a, 7b, and 7c, which are equipped with a control device and can take out a fixed quantity of crushed waste material from hoppers 6a, 6b, and 6c that store crushed waste material according to various particle sizes, can be used to asphalt mixture depending on the type of asphalt mixture to be manufactured. The waste material is taken out and put into the drum 2 via belt conveyors 8 and 9, and the waste material is rolled and flowed down within the drum 2 and heated to a desired temperature. The heated waste material is fed into the mixer 11 from the discharge section 10, and as needed, the missing asphalt is replenished, and a softener and stone powder, which are property restoring agents, are mixed in for adjustment before shipment. There is.

12 is a stone powder storage bottle for storing stone powder;
Rotary valve 13 of quantitative supply device installed in the lower discharge part
The stone powder discharged from the pipe 1 is fed by a pressure blower 14.
5 and is sent to the exhaust gas outlet section of the flue 4 of the dryer 1. Reference numeral 16 denotes a constriction section provided at the exhaust gas outlet section of the flue 4, which narrows the cross-sectional area through which the gas flow passes, so that the stone powder can adhere to the dust efficiently. Reference numeral 17 is a cyclone dust collector that captures coarse particles of dust flowing out, 18 is a bag filter that is a filtering dust collector that captures fine particles of dust that are not captured by the cyclone dust collector, and 19 is a bag filter. It's a chimney.

[0012] However, in order to recycle waste materials, a hopper is required.
Waste material having a desired particle size is taken out from feeders 7a, 7b, and 7c according to the type of asphalt mixture to be manufactured from 6a, 6b, and 6c. Then, the waste material is fed into the drum 2 via belt conveyors 8 and 9, and the scrap material is scraped up by scraping blades provided in the drum 2 while rolling and flowing down.
The waste material is heated by the combustion gas from the burner 3, and the heated waste material is fed into the mixer 11 from the discharge section 10.

Accompanying the gas flow passing through the drum 2,
Dust coated with sticky asphalt components flows out. However, the stone powder that is discharged in fixed quantities from the stone powder storage bin 12 via the rotary valve 13 is sent to the blower 1 for pressure-feeding.
4, the stone powder is fed into the flue 4 via the supply pipe 15 to promote the outflow of the exhaust gas, and the stone powder collides with the dust near the constriction part 16 provided in the flue 4, so that the stone powder is removed from the dust surface. The dust surface is coated with stone powder to make the dust non-adhesive.

The dust that has become non-adhesive passes through the downstream flue 4 without adhering to it, and the cyclone dust collector 17 captures the coarse part of the dust, and the bag filter 18 captures the fine part of the dust. At the same time, stone powder not attached to the dust is also collected, and purified gas is released into the atmosphere from the chimney 19. Since the stone powder used to cover the dust is mixed in to restore the properties of the asphalt mixture, the dust and stone powder captured by the cyclone dust collector 17 and bag filter 18 are returned to the mixer 11. , can be used without waste.

[0015]

[Effects of the Invention] As described above, according to the present invention, stone powder, which is a material for restoring the properties of waste wood, can flow out from the supply pipe to the exhaust gas outlet part of the flue connected to the dryer, and the exhaust gas from the dryer can flow out. can be encouraged. Then, by mixing this stone powder into the gas flow led out from the dryer and coating the sticky dust accompanying the gas flow with the stone powder to make the dust non-adhesive, the dust is removed from the flue and the downstream cyclone dust collector. It prevents adhesion to equipment, bag filters, etc., and does not cause a decline in equipment capacity or functionality. Also, bag filters with high dust collection performance using fiber filter media can be used, making it an excellent choice for pollution prevention. It is beneficial.

Furthermore, the stone powder used to coat the dust surface is originally mixed into the asphalt mixture, and stone powder captured by a cyclone dust collector and bag filter, and asphalt recycled from dust coated with stone powder, are used to coat the dust surface. Since it is mixed into the mixture and used, there is no waste.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway schematic explanatory diagram of an asphalt pavement waste recycling plant employing the method of the present invention. 1...Dryer 4
…Flue 15…Supply pipe

Claims (1)

[Claims] Claim 1: The waste material is supplied to a dryer, which is a heating device for asphalt pavement waste material, and is heated and regenerated, and the scattered dust is captured by a cyclone dust collector installed downstream of the dryer and a bag filter downstream thereof. In the method of using asphalt pavement waste recycling equipment, a supply pipe that mixes stone powder, which is a property restoring agent for waste materials, is connected to the exhaust gas outlet near the dryer of the flue connected to the dryer to discharge exhaust gas. At the same time, the tip of the supply pipe is arranged so as to face the exhaust gas outflow direction,
Stone powder is force-fed into the supply pipe and introduced into the flue so that the stone powder is mixed into the gas flow led out from the dryer;
Asphalt pavement waste material characterized in that the stone powder and dust coated with stone powder captured by a cyclone dust collector and a bag filter are reduced to a mixer and mixed into recycled asphalt mixture for use. A method for preventing the adhesion of sticky dust generated during playback.