Method and apparatus for recycling asphaltaggregate compositions

[Detailed Description of the Invention]

The present invention relates to the method and device which manufacture the constituent of the asphalt and aggregate through which it re-circulates by the used asphalt concrete being heated and mixed within the drum to which a flame and the high temperature gas of combustion are supplied, and which can be rotated. With this applicant's for a patent U.S. Pat. No. 3999743, The method and device which re-circulate through the used asphalt and an aggregate constituent are indicated, and it is the constituent, It includes introducing this specific method that is classified into the size range of particles which are ground and are different, is introduced to the drum which can rotate freely, and is directly exposed to a flame and the high temperature gas of combustion within the drum to the separate heating field where the drum isolated the asphalt of Rough and Sai, and the particles of the aggregate constituent. The particles of a detailed thru/or small asphalt containing composition, Since it compares with coarse particles and is heated still more easily, small particles are introduced into a drum in a low-temperature field so that it may burn, or it may prevent that it is overheated and asphalt deteriorates and it may prevent that this produces the contaminant which is not desirable as for remarkable smoke and others. The object of the present invention is to provide the method of further improving reduction of the air pollutant generated in the case of heating of asphalt and an aggregate constituent during re-circulation processing. The present invention introduces asphalt non-containing aggregate particles to the high temperature region of a rotation drum, and is this, It includes preventing overheating of the asphalt of the materials in which it was directly exposed to a flame and/or the high temperature gas of combustion, and the aggregate introduced the asphalt and the aggregate constituent through which it re-circulates to the low-temperature field beyond 1 or it of a drum, and re-circulated through them by this. Reference of a figure shows drier type drum 10 which has the outside cylindrical shape cover thru/or field 13 which surrounds a hollow interior drum chamber, stationary inlet end part wall 47, and stationary outlet end part cover 45 and which can be rotated. It was fixed to the inside of a drum and a plurality of long and slender lifters thru/or shuttlecocks 18 is mostly prolonged covering the length inside a drum. The purpose of a lifter is to lift aggregate and an asphalt containing composition in the case of rotation of a drum, and to promote mixture. Next, materials fall by gravity to the bottom of the drum which becomes Takiaka from the lifter going up and rotates in the case of operation with mixture and heating. A drum inclines like illustration so that the aggregate introduced from inlet end part 16 may be preferably sent to outlet end part 17 of a drum by gravity gradually. Therefore, an inlet end part is high intermediary To have to an outlet end part. The grade of an inclination can be changed so that the speed which circulates a materials drum may be changed. This device is provided with the slewing mechanism of the drum which is not illustrated, for example, a motor, other drives, and the sprocket prolonged around drum side 13 where the chain which gears on a gear was fixed. A drum is supported by a roller and the suitable frame. The specific device which performs rotation and support of a drum is not a part of present invention, and he can understand it by the technical field concerned. In this device, the high temperature gas of the combustion made by burner 12 is sent to the inside of a drum. Stationary outlet end part Gabber 45 has port 42 at the bottom, and the constituents heated and mixed by passing the port are collected. the last constituent -- only -- a port -- a connoisseur -- it falls to intermediary conveyor 38. Other equivalent recall devices are usable and the thing of illustration is only an example. Both the inlet end part wall and the outlet end part cover are being slightly isolated at least from each drum end surface so that rotation of a drum may not be checked. Degassing chimney 50 is adjoined and located in the upper part or the upper part of an outlet end part cover, and collaborates with waste gas fan 48 who pushes into the Welfare chimney which attracts the high temperature gas from burner 12 via a drum, and it discharges to the atmosphere. Unlike this, gas and the caught dust may be sent to the dust collector who collaborates with a lead pipe thru/or a KO box. Although the characteristic of others of this device is indicated by above-mentioned patent application, that related part is explained here for reference. An important improvement with the method of the present invention and a device has aggregate and the asphalt joint particles through which it re-circulates in the mode introduced to heating and a mixed drum, and the improved advantageous result is obtained by this. By comparing with the high temperature region where aggregate particles are introduced, and introducing asphalt content re-circulation particles to the low-temperature field of a device, it is improved and heating efficiency is degradation of asphalt, Although not eliminated, the product which was reduced considerably and has been improved was obtained, and it became clear that the air pollution problem based on the smoke discharged to the atmosphere, unburned hydrocarbon, poisonous gas, and fame was eliminated. Like illustration, new aggregate particles 25 of aggregate are usually directly exposed to the high temperature gas of end wall 47 which it is immediately sent to drum 10 in inside inlet end part 16, and is from burner 12 in the 1st most hot field of a drum. Aggregate is heated by the flame which has both of the luminescence portion and nonluminescent portion by combustion of burner 12, Radiation energy, and high temperature gas, and burner 12 is, It is the arbitrary suitable usual oil or the thing of a gas combustion type which produces the flame turned to the inside of a drum via the orifice funnel thru/or opening of inlet end part wall 47 located suitably, and high temperature gas. About 538 thru/or 1649degreeC (about 1000 thru/or 3000=) may be sufficient as environmental temperature, for example, and, therefore, high temperature may be further sufficient as it like distribution with a flame and high temperature gas in this high temperature region of a drum at the size of a burner, and an output. Aggregate particles fall after It was lifted along and the inside of high temperature gas to a drum inside at fall thru/or Takiaka, are heated gradually in the meantime, and move forward toward the outlet end part of a drum. Like illustration, the asphalt through which it re-circulates, and aggregate particles 35 are introduced to the 2nd field of the low temperature which is in a certain distance from an inlet end part to the front toward the lower stream thru/or the outlet end part of a device. A specific temperature of a low-temperature field is dependent on the distance from the burner of the part where asphalt content particles are introduced with the output thru/or capacity of a burner used for a device. It is because cover of the aggregate particles which become waterfall not only in the reason of the distance from burner 12 but in a high temperature region forms the sink of heat so that the temperature of high temperature gas may be fallen remarkably, and it moreover covers asphalt content particles from the radiant energy of a flame that the 2nd field is low temperature. Although the 2nd field is low temperature from the high temperature region of an inlet end part, asphalt and aggregate particles are fully heated by being mixed with the aggregate which it was exposed to the high temperature gas which passes through this field, and was heated. When a drum rotates, after asphalt content particles are raised, they are mixed with the heated aggregate particles which fall in the shape of waterfall and are sent from a high temperature region. The suitable temperature in the 2nd low-temperature field is below about 427 degreeC (800=). A high temperature is preferably eliminated so that combustion of the fine powder containing the asphalt of a usually remarkable quantity heated easily one layer may be prevented. These fine powder is the small asphalt content particles of ground asphalt joint material which re-circulates. U.S. Pass No.8 Sieve of series and occupy about 20 thru/or the amounts % of 60 of a re-circulation constituent in many cases. When there is most quantity of fine powder, it is desirable to introduce asphalt content particles to a low-temperature field at a temperature still lower than 316 degreeC (600=) especially, when a fine powder child's size is very small. Therefore, the temperature of a specific low-temperature field is dependent on the existing size and quantity of fine powder. Although one low-temperature field is illustrated, 2 or the separate field beyond it may be used so that the particles of the asphalt containing composition through which it re-circulates may be introduced, and each of it is low temperature from the field where the next near an inlet end part adjoins. Therefore, it is admitted that arbitrary numbers of a plurality of fields thru/or positions which introduce asphalt and aggregate composition particles may be used depending on practical consideration of the structure of a device, and the separation of a particle size and the handling which differ in a request. Although one low-temperature field is enough and being obtained, two low-temperature fields may be used and it is [ the 2nd thing introduces microscopic particles to asphalt with the 1st coarse thing, and aggregate particles, and also ] a low-temperature field. Such a plurality of low-temperature fields are described by above-mentioned U.S. Pat. No. 3999743 with separation of a different asphalt content particle size range. It is required only for two fields to actually be used if this device has a device which introduces a constituent to two or more fields. Since a specific distance between fields is dependent on the capacity of Bourna, and a particle size, the distance between inlet end part wall 47 and the 2nd field supplied by shot 24 like illustration is not Then(ed) and restricted only for illustration. Therefore, the distance between fields is selected so that it may become a desired temperature in each field. The quantity of the aggregate added by the re-circulating method is dependent on some variables. Depending on the specification and the requirements for pavement thru/or surface work, the end products may usually understand having about 80 thru/or 95% of the weight of aggregate, and may usually use aggregate beyond it by arbitrary quantity of aggregate, for example, about 50 % of the weight, or request. New aggregate in this method, and combination of asphalt, Since a mixture with a high new ratio is obtained, the quantity of the aggregate used is usually dependent on the quantity and the state of many years past of the constituent which can be used and through which it re-circulates, the aggregate which can be used, the requirements for a price, and regulation of the air pollution in the place of the spot thru/or a plant. Aggregate or the asphalt through which it re-circulates, and aggregate particles are introduced by suitable arbitrary modes, for example, a shot, or Hoppa. Funnel shot 30 is conveniently used in the inlet end part wall which stands it still, and aggregate particles 25 are introduced through conveyor 46. the particle -- the high temperature flame and combustion gas of burner 12 -- a connoisseur -- the opening of end wall 47 is passed so that intermediary fall may be carried out. Unlike this, it is fixed to the exterior of a drum and the shovel device which collaborates with the gutter in which a constituent is inserted is illustrated so that introduction of introduction and/or asphalt of aggregate to a drum low-temperature field, and aggregate particles may be performed. Gutter 36 is stood still and located in the circumference of rotating cylindrical shape drum 10 like illustration. A plurality of isolated ports 20 are located in the circumference of a drum side, and an opening is carried out inside a drum, and they are open for free passage to the exterior of a drum. The exterior of the Then drum was fixed on each port 20, and shovel 31 is provided with the blank which is open for free passage in a port, and the edge which has a field which engages with a constituent in the case of rotation of a drum. Gutter 36 forms the blank which it extends around an intermediary drum, and the shovel is located, and passes a shovel in the case of rotation of a drum. The composition particles which shot 24 was open for free passage to gutter 36, therefore were introduced via the shot to the gutter are picked up with a shovel next, and fall by gravity inside a drum via port 20. It may pass without resistance of a shovel, and the size of a gutter and shape must be defined so that the composition particles introduced to the blank of the gutter can be picked up. Although the flank of a gutter has the edge which follows preferably the whole outside shape of the drum which it surrounds, since a drum rotates and the gutter is maintained by the state of rest on the other hand, small isolation of the edge is carried out at least from a drum side so that contact may be prevented. For example, useful devices that it is not important and arbitrary may be especially used for the device which introduces particles to a gutter via shot 24. For example, conveyor device 22 like illustration may draw composition particles to shot 24, next the particle is sent to Hoppa and a gutter. Although in particular the size and shape of a shovel and a gutter are not important, the outside edge of a shovel is preferably formed so that small [ whether it is slight that it is the same shape as the inner wall of a gutter ]. a shovel -- desirable -- particles -- gravity -- the inner side of a shovel -- Along -- it inclines so that it may fall to a port easily. It is further described as the gutter by U.S. Pat. No. 4034968 for details, and the explanation is described as the shovel used for a low-temperature field, and a port here for reference. However, arbitrary devices may be provided with 1 or the conveyor beyond it which may be used for introducing particles to a different field, for example, penetrates outlet end part cover 45 from an outlet end part, and is prolonged into a drum. Therefore, the device is not important and the thing of illustration is a thing for illustration. This device may be provided with 1 which has opening 15 or the same device beyond 1 or it, or pipe 14 beyond it so that asphalt may be inserted in to a drum. Preferably, asphalt is heated so that it may be supplied via such a pipe, and it may have the degree of Shigeru of a fluid further, and it is sprayed to the particles in a drum so that desired asphalt and the product characteristics of aggregate may be acquired. Preferably, asphalt is added by the granular mixture isolated and heated from burner 12 to the front outlet end part so that the combustion or degradation which may arise may be prevented. However, asphalt must be introduced distantly enough in a drum so that the composition mixture of the aggregate gradually sent to an outlet end part when falling and falling to Takiaka within the inclined rotation drum, and the asphalt and aggregate through which it re-circulated may fully be mixed. This distance can be easily determined with the art concerned like the quality of asphalt. Of course, depending on the ratio of aggregate to the re-circulation asphalt content materials mixed, if the quantity of the asphalt added has much quantity of aggregate, it needs many asphalt. Preferably, a pipe and opening 15 of an asphalt exit are prolonged in a drum so that the position which introduces asphalt content particles may be adjoined like illustration and fluid asphalt may be discharged. Asphalt is added distantly in a drum so that suitable mixture can be preferably given in practice before composition is collected in an outlet end part. Pipe 14 is elongated to different length so that the flexibility which discharges fluid asphalt in a different predetermined position may be acquired. The obtained constituent which are collected has the suitable temperature more than at least about 93 degreeC (200=), preferably 107 degreeC (225=). A desired temperature is obtained by changing Pitch of a drum thru/or an inclination, the revolving speed of a drum, heating of a burner, and a materials insertion ratio. By request, an aromatic hydrocarbon softener may be used for the end products as indicated by U.S. Pat. No. 4000000. The flexibility of this method and device is clear with the art concerned like change and the advantage of others of the present invention within the limits.

[Brief Description of the Drawings]

A drawing shows the elevational view which fractured some devices of one example of the present invention. 10 ...... A drier type drum, 12 ...... A burner, 13 ...... The cylindrical shape cover of a drum, 14 ...... [ ...... New aggregate particles, 30 / ...... The funnel shot for aggregate, 31 / ...... A shovel, 35 / ...... The asphalt of re-circulation, aggregate particles, 36 / ...... Gutter. ] The pipe for insertion of asphalt, 20 ...... A port, 24 ...... A shot, 25