JP4991502B2 - Method and apparatus for producing asphalt mixture - Google Patents

Description

  The present invention relates to a method and an apparatus for producing an asphalt mixture which is a road pavement material in an asphalt plant.

  The asphalt plant factory has a new material heating dryer (hereinafter referred to as “new material dryer”) that heats new aggregate (hereinafter referred to as “new material”) and asphalt pavement waste material (hereinafter referred to as “new material dryer”) There are many places where both waste material heating dryers (hereinafter referred to as “waste material dryers”) for heating waste materials ”are installed. These asphalt plant factories produce asphalt mixtures that use 100% of new materials and asphalt mixtures in which waste materials are mixed into the new materials in various proportions. Recently, there is a tendency to increase the mixing rate of waste materials. Some waste materials contain more than 50%.

  In this way, when the mixing ratio of waste materials increases, the new material dryer may heat the new material with less than half of the new material heating capacity. The amount of aggregate flowing through the material is extremely reduced, and the heating efficiency is greatly reduced, resulting in poor fuel consumption. Also, if the burner combustion amount is reduced to lower the heating capacity, the exhaust gas suction amount of the new material dryer will decrease, so the passing wind speed in the dryer will decrease, and much of the fine dust scattered with the exhaust gas flow will be reduced. Will remain in the dryer and is screened on the screen of the plant body in the next process and stored in the sand storage bin together with the sand, but when a lot of fine dust is mixed in the sand storage bin, Since sand containing a lot of fine dust is mixed in the asphalt mixture as sand, the quality of the asphalt mixture is deteriorated.

Therefore, in Japanese Patent Application Laid-Open No. 2003-129410, a plurality of small new material dryers are arranged in parallel, and a 100% new material asphalt mixture is used instead of allowing the plant capacity to be exhibited by a single new material dryer. In the case of manufacturing, a plurality of new material dryers are operated, each new material is heated to a target heating new material temperature, and they are merged and supplied to the plant main body to exert the maximum capacity of the plant. In addition, when manufacturing an asphalt mixture in which new materials and waste materials are mixed, a predetermined new material dryer corresponding to the heating amount of the new material is selected from a plurality of new material dryers and operated to produce the asphalt mixture. Proposed method to do.
JP 2003-129410 A

  In the above conventional method, a plurality of small new material dryers are installed in parallel, and even if the new material heating amount is small, by selecting and heating a small new material dryer that matches the new material amount, The fuel efficiency is improved without lowering the heating efficiency, and the quality of the asphalt mixture is not lowered by scattering and removing fine dust without drastically reducing the passing air speed of the new material dryer. Therefore, there has been a search for an effective manufacturing method equivalent to or better than this conventional method.

  In view of the above points, the present invention provides an asphalt mixture manufacturing method and apparatus capable of efficiently manufacturing 100% of new materials or an asphalt mixture in which new materials and waste materials are mixed in an asphalt plant. Let it be an issue.

  In order to solve the above-mentioned problems, the present inventors have made extensive studies and have come to the view that it is also advantageous to arrange in series instead of the parallel arrangement of conventional small dryers. That is, the method for producing an asphalt mixture according to claim 1 of the present invention provides an asphalt plant for producing an asphalt mixture having a waste dryer and a heating capacity at least lower than the maximum new material heating capacity corresponding to the maximum production capacity of the plant. If two new material dryers are provided and a 100% new asphalt mixture is produced, the new material amount corresponding to the production capacity of the plant is supplied to the first new material dryer and the target heating new material temperature When heating to a predetermined temperature that does not reach the temperature, supplying the heated new material to the second new material dryer and heating it to the target heated new material temperature, while producing an asphalt mixture that mixes new material and waste material After supplying the required amount of new material to the first new material dryer and heating it to the target heating new material temperature, the heated new material is supplied to the second new material dryer and heated. It causes to pass without being characterized in that the heating new materials discharged from the second new material dryer is supplied to the plant body so as to produce the asphalt mixture.

  The asphalt mixture manufacturing apparatus according to claim 2 includes two units having at least a heating capacity lower than the maximum new material heating capacity corresponding to the maximum production capacity of the waste dryer and the asphalt plant for manufacturing the asphalt mixture. The new heated dryer that has passed through the first new dryer among the new dryers is supplied to the second new dryer, and the heated new material that has passed through the second new dryer Is characterized in that it is configured to be supplied to the plant body.

  An apparatus for producing an asphalt mixture according to claim 3, wherein the first new material dryer is disposed above the second new material dryer, and the discharge chute is disposed at a discharge portion of the first new material dryer. This is characterized by the fact that the discharge end of the product is exposed to the input section of the second new material dryer.

  According to the method for producing an asphalt mixture according to claim 1 of the present invention, the asphalt plant for producing the asphalt mixture is provided with a waste material dryer and a heating capacity at least lower than the maximum new material heating capacity corresponding to the maximum production capacity of the plant. When two new material dryers with the same temperature are produced and a 100% new asphalt mixture is produced, the two new material dryers are connected and heated to the target heating new material temperature. Since the residence time in the is increased, it is also possible to improve the quality of the asphalt mixture by reducing the residual moisture of the heated new material. In addition, when manufacturing an asphalt mixture in which new materials and waste materials are mixed, the first new material dryer is heated to the target heating new material temperature, and the second new material dryer is passed without heating. Therefore, even if the heating amount of the new material is small, it does not greatly fall below the heat drying capacity of the first new material dryer, the fuel efficiency can be suitably maintained without lowering the heating efficiency, and fine dust is separated by scattering. It can be removed without degrading the quality of the asphalt mixture. Furthermore, when the heated new material passes through the second new material dryer, it can be expected that the residual moisture of the heated new material is reduced by performing aeration or air drying only by aeration or blowing.

  Moreover, according to the asphalt mixture manufacturing apparatus of claim 2, the asphalt plant for manufacturing the asphalt mixture has a heating capacity at least lower than the waste material dryer and the maximum new material heating capacity corresponding to the maximum manufacturing capacity of the plant. Two new material dryers are provided, and the heated new material that has passed through the first new material dryer among the new material dryers is supplied to the second new material dryer, and the heating that has passed through the second new material dryer Since the new material is supplied to the plant body, it is heated by two new material dryers when manufacturing 100% new material asphalt mixture, while the asphalt mixture is mixed with new material and waste material. By heating with only one new material dryer, the new material can be heated efficiently, and by separating and removing fine dust and reducing the residual moisture in the heated new material. Manufacture of good asphalt mixture quality are also possible. Furthermore, in order to connect two new material dryers in series, the new material supply line is combined into one, and the equipment is simplified compared to the conventional one with multiple new material supply lines arranged in parallel. Can be planned.

  According to the asphalt mixture manufacturing apparatus of claim 3, the first new material dryer is disposed above the second new material dryer, and is disposed in the discharge portion of the first new material dryer. Since the discharge end of the discharge chute faces the input section of the second new material dryer, there is an overlap in the plan view, saving space compared to the conventional parallel arrangement structure of new material dryers. Effective utilization is possible.

  In the asphalt mixture manufacturing apparatus of the present invention, the apparatus includes one waste material dryer and two new material dryers arranged in series, and the heating that has passed through the first new material dryer of the new material dryers. The new material is supplied to the second new material dryer, and the heated new material that has passed through the second new material dryer is supplied to the plant body. Preferably, the first new material dryer is disposed above the second new material dryer, and the discharge end of the discharge chute disposed in the discharge portion of the first new material dryer is disposed on the second new material dryer. Try to face the input section. Both the first new material dryer and the second new material dryer employ a dryer that has a heating capacity that is at least lower than the maximum new material heating capacity commensurate with the maximum production capacity of the plant. The new material is heated by using a dryer, and the maximum new material heating capacity of the plant is demonstrated.

  And when manufacturing the asphalt mixture which used 100% of new materials, it heats to desired temperature using two new material dryers arranged in series. That is, first, a new material amount commensurate with the production capacity of the plant is supplied to the first new material dryer and heated. At this time, since the first new material dryer does not have the ability to heat the supplied new material to a target heating new material temperature, for example, 160 ° C., the first new material dryer is heated to a predetermined temperature, for example, about 100 ° C. Then, the heated new material that has passed through the first new material dryer is supplied to the second new material dryer, reheated by this new material dryer, heated to the target heated new material temperature, and supplied to the plant body, An asphalt mixture is produced.

  Moreover, when manufacturing the asphalt mixture which mixed the new material and the waste material, the required amount of new material is supplied to a 1st new material dryer, and it heats at a stretch to target heating new material temperature. Therefore, the first new material dryer adopts the one having the heating capacity required to heat the new material amount corresponding to the maximum mixing ratio of the new material and the new material at the time of mixing the new material. When the heating capacity of the new material dryer is determined, the heating capacity of the second new material heating dryer is determined from the maximum new material heating capacity commensurate with the maximum production capacity of the plant.

  The heated new material that has passed through the first new material dryer is supplied to the second new material dryer. This second new material dryer rotates the burner without burning it, and passes the heated new material without heating. At this time, the heated new material is aerated while rolling down in the second new material dryer, and the residual moisture in the heated new material is reduced to some extent, but further air is blown into the second new material dryer. If so, residual moisture in the heated new material can be further reduced by aeration drying. The heated new material that has passed through the second new material dryer is supplied to the plant body and mixed with the heated waste material heated by the waste material dryer to produce a predetermined asphalt mixture.

  Thus, according to the manufacturing method and apparatus of the above asphalt mixture, when manufacturing an asphalt mixture in which 100% of new material or new material and waste material are mixed, two new material dryers arranged in series are properly used and used as new material. The heating efficiency is not lowered even when a small amount of new material is heated. In addition, the residence time of the new material in the dryer becomes longer compared to the parallel arrangement of the new material dryer in the conventional method, so the heating time is increased or the aeration in the second new material dryer during the production of the mixture of new material and waste material. It can be expected that residual moisture in the heated new material will be reduced by air-drying and ventilation, and the quality of the asphalt mixture can be improved.

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

  In the figure, 1 is a first new material dryer for heating a new material, 2 is a second new material dryer arranged in series on the new material discharge side of the new material dryer 1, and the first new material dryer The heated new material that has passed through the material dryer 1 is supplied to the second new material dryer 2. Reference numeral 3 denotes a waste material dryer for heating the waste material, and this one waste material dryer 3 and the two new material dryers 1 and 2 are provided in the asphalt plant.

  The first new material dryer 1 and the second new material dryer 2 have substantially the same structure and adopt a countercurrent heating method, and a number of scraping blades (not shown) are provided on the inner periphery. Cylindrical drums 4, 4 ′ arranged around are rotatably supported on machine bases 5, 5 ′, respectively, and are rotated at a predetermined speed by a driving device (not shown). Exhaust smoke connected to the cold hoppers 8 and 8 'at the other end while hot air is sent into the drums 4 and 4' from the burners 7 and 7 'disposed at the hot hoppers 6 and 6' at one end A high-temperature gas flow passing through the drums 4 and 4 'is maintained by sucking the exhaust gas with a wind exhauster (not shown) at the ends of the passages 9 and 9'.

  The new material dryers 1 and 2 have a heating capacity that is at least lower than the maximum new material heating capacity corresponding to the maximum production capacity of the plant, but the first new material dryer 1 is an asphalt mixture containing waste materials. The heating capacity of this first new material dryer 1 is adopted with the heating capacity required to heat up the new material amount that matches the maximum mixing ratio of the new material to the target heating new material temperature. Is appropriately determined, the heating capacity of the second new material dryer 2 is also appropriately determined from the maximum production capacity of the plant.

  Then, the new material is supplied into the drum 4 of the first dryer 1 by the supply conveyor 10 and brought into contact with the hot air fed from the burner 7 while rolling down the drum 4 while scraping the new material with the scraping blades. Then, the heated new material is discharged from the discharge chute 11 disposed in the hot hopper 6 and supplied into the drum 4 ′ of the second new material dryer 2. Similarly, the heated new material supplied to the second new material dryer 2 rolls down in the drum 4 ′ and is supplied from the discharge chute 12 to the bucket elevator 13.

  The heated new material supplied to the bucket elevator 13 is lifted up to the upper part of the plant body 14 of the asphalt plant, put into the vibrating sieve 15, sorted according to particle size, and stored in the new material storage bin 16 for each particle size. The Also, in the lower part of the new material storage bin 16, there are a new material measuring tank 17, a stone powder measuring tank 19 for measuring the stone powder stored in the stone powder storage bottle 18, an asphalt measuring tank 20 for measuring molten asphalt, and a lower part of these measuring tanks. Is provided with a mixer 21, and the materials weighed in each weighing tank are put into the mixer 21 and mixed for a predetermined time to produce a desired asphalt mixture.

  Further, the waste material dryer 3 for heating the waste material adopts a cocurrent heating method, and a cylindrical drum 22 having a large number of scraping blades (not shown) is provided on the machine base 23 around the inner periphery. The drum 22 is rotatably supported and rotated at a predetermined speed by a driving device (not shown), and a flame is formed in the combustion chamber 26 by a burner 25 disposed at one end of the drum 22 on the hot hopper 24 side. While the hot air is sent to the drum 22 while the exhaust gas is sucked by the exhaust fan (not shown) at the end of the exhaust flue 28 connected to the waste material storage bin 27 at the other end, the hot gas flow passing through the drum 22 Is maintained.

  Then, the waste material is supplied into the drum 22 by the supply conveyor 29 from the hot hopper 24 side of the waste material dryer 3, and the waste material is heated while rolling down in the drum 22 and temporarily stored in the waste material storage bin 27. The stored waste material is weighed in a predetermined amount in a lower waste material measuring tank 30 and supplied to the mixer 21 by an appropriate transfer means such as a conveyor so that an asphalt mixture in which the waste material is mixed with the new material can be manufactured. .

  Next, a method for producing an asphalt mixture using the above apparatus will be described. When producing a 100% new material asphalt mixture, the new material is heated to the target temperature by using both the first new material dryer 1 and the second new material dryer 2 arranged in series. First, a new material amount corresponding to the production capacity of the plant is cut out from an aggregate storage hopper (not shown) and supplied to the first new material dryer 1 via the supply conveyor 10. The new material supplied to the first new material dryer 1 is heated by being exposed to the hot air of the burner 7 while rolling down in the drum 4. Since there is no ability to heat to the material temperature, for example, 160 ° C., the material is heated to a predetermined temperature, for example, about 100 ° C.

  Next, the heated new material that has passed through the first new material dryer 1 is supplied from the discharge chute 11 to the second new material dryer 2 and exposed to the hot air of the burner 7 ′ while rolling down in the drum 4 ′. The second new material dryer 2 heats up to the target heating new material temperature. And the heated new material which passed the 2nd new material dryer 2 is stored in the new material storage bin 16 of the plant main body 14 via the bucket elevator 13 from the discharge chute 12, and is used for manufacture of an asphalt mixture.

  In addition, when manufacturing an asphalt mixture that mixes new materials and waste materials, the amount of new materials used decreases according to the mixing ratio of new materials and waste materials, so the first new material dryer 1 heats the new materials at once. Ability to heat to new material temperature, eg, 160 ° C. Accordingly, a necessary amount of new material is cut out from an aggregate storage hopper (not shown), supplied to the first new material dryer 1 via the supply conveyor 10, and exposed to the hot air of the burner 7 while rolling down in the drum 4. To the target heating new material temperature.

  The heated new material that has passed through the first new material dryer 1 is supplied from the discharge chute 11 to the second new material dryer 2. The second new material dryer 2 rotates the drum 4 'without burning the burner 7', and passes the heated new material without heating. At this time, it is preferable that only the blower provided in the burner 7 ′ is operated and only the air is blown, and the air drying is performed while the heated new material passing through the drum 4 ′ rolls down. And the heated new material which passed the 2nd new material dryer 2 is supplied to the plant main body 14 via the bucket elevator 13, and is used for manufacture of an asphalt mixture.

  Further, the amount of waste material required for the waste material dryer 3 is cut out from a waste material storage hopper (not shown), supplied via the supply conveyor 29, and exposed to the hot air of the burner 25 while rolling down in the drum 22 to a predetermined temperature. Heated. The heated waste material that has passed through the waste material dryer 3 is temporarily stored in the waste material storage bin 27, and after a predetermined amount is measured in the lower-order waste material measuring tank 30, is supplied to the mixer 21 by an appropriate transfer means such as a conveyor to be a new material. Asphalt mixture with waste material mixed in is produced.

  In this way, since the two new material dryers 1 and 2 are arranged in series and the new material to be heated is connected, the residence time of the new material in the dryer compared to the parallel arrangement of the new material dryers of the conventional method Therefore, when heating with two new material dryers 4 and 4 ', it is possible to reduce the residual moisture in the heated new material by increasing the heating time. In addition, at the time of manufacturing a mixture of new material and waste material, the second new material dryer 4 'can be expected to reduce the residual moisture in the heated new material due to the increase in residence time and the effect of air drying. Moreover, the supply arrangement | positioning conveyor 10 which is a new material supply line becomes one by the serial arrangement structure of the two new material dryers 1 and 2, and an apparatus can be simplified. Furthermore, since the new material supply line becomes a single line, the first new material dryer 1 can be disposed above the second new material dryer 2, thereby saving space.

It is a schematic block diagram which shows one Example of the asphalt mixture manufacturing apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... First new material dryer 2 ... Second new material dryer 3 ... Waste material dryer 11 ... Discharge chute 14 ... Plant body

Claims (3)

  An asphalt plant that produces asphalt mixture is equipped with a waste material dryer and two new material dryers that have at least lower heating capacity than the maximum new material heating capacity corresponding to the maximum production capacity of the plant. When a new material is supplied to the first new material dryer and heated to a predetermined temperature that does not reach the target heated new material temperature, the heated new material is then added to the second new material dryer. When the asphalt mixture is mixed with new materials and waste materials, the required amount of new materials is supplied to the first new material dryer. Then, after heating to the target heating new material temperature, the heated new material is supplied to the second new material dryer without being heated and discharged from the second new material dryer. Method for producing asphalt mixture, characterized in that the heat New material is supplied to the plant body was to produce a asphalt mixture.   An asphalt plant for producing an asphalt mixture is provided with a waste material dryer and two new material dryers having a heating capacity at least lower than the maximum new material heating capacity commensurate with the maximum production capacity of the plant. The new heating material that has passed the first new material dryer is supplied to the second new material dryer, and the new heating material that has passed the second new material dryer is supplied to the plant body. Asphalt mixture manufacturing equipment.   The first new material dryer is disposed above the second new material dryer, and the discharge end of the discharge chute disposed at the discharge portion of the first new material dryer is used as the input portion of the second new material dryer. The asphalt mixture manufacturing apparatus according to claim 2, wherein the asphalt mixture manufacturing apparatus is provided.

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