SCHRETER ASSOCIATES
Consulting Mechanical Engineers

WHAT'S NEW

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CURRICULUM VITAE

 

 

 

 

 

 

The following drawings and other data are the property of Schreter Associates

They are copy righted and may not be reproduced, copied, published or transmitted

to others. They are presented for the purposes of Schreter Associates and their clients

and are strictly confidential.

 

FIGURE 1

 

 

FIGURE 2

 

FIGURE 3

 

FIGURE 4

 

FIGURE 5

Figure 1 shows and isometric view of the recycle entry . Rotation is clockwise. The hot virgin material bed is shown in gray resting in the rotating drum 74. The virgin bed rides up the left side reaching a maximum height at angle "B".(see figure 3). The addition of flights 58 still does not perceptibly increase the height. The height achieved in the bellmouth will be less because some of the virgin will fall through openings 162.

Figure 1, 2 and 3 represent the system where RAP material is being deposited on one of the 154 (blue) flights which is about 10 degrees above the horizontal. The rap material leaves the RAP chute and slides down the flight which is inclined at about 45 degrees. The speed that the materialslides down the flight is shown in figure 4. The 162 opening just above the 154 flight is essentially inactive in that the opening is well above the virgin material bed. Therefore, RAP material is deposited directly on to the hot 154 flight and immediately starts rejuvenation. The temperature of the 154 flight will be above the temperature of the virgin material .

Furthermore, any virgin material that falls through slots 162, within angle "B and C" (see figure 3) will be moved downstream as a result of the rotation of the drum and the inclination of the flights. The rotation time, assuming 7.5 rpm, from the top of angle B to the point that RAP falls on the flight is 1.0 second. Any virgin material that fell through slot 162, at the top of angle B will have moved downstream on the flight at least 40 inches, (see figure 4) before the flight will receive RAP.

 

 

(c)Schreter Associates 1998

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