Arizona Portland

2) Arizona Portland. Arizona Portland operates a cement plant in Rillito, Arizona, near Tucson, which has been burning tdf since 1986. They have a different kiln configuration from Genstar and they use a different tdf feed system. They feed the tdf into the flash calciner at the back end of their system. Until recently, they had been using an air lock system to feed tdf into their calciner at a rate of 2 tons per hour. However, they had problems with the pneumatic feed system. Pieces of steel wire from the tdf repeatedly plugged up the elbows in the feed path. Because of these problems they decided to install a mechanical feed system instead. 

With the conversion to a mechanical feed system, they expect to double their tdf feed capacity and run 4 tons per hour. This should result in a considerable fuel cost savings, because they can obtain tdf for about 1 per million Btu, whereas they would otherwise be burning more coal which costs about 2 per million Btu. With the new configuration they could obtain 10 percent of their heating value from tdf, 10 percent from natural gas, and 80 percent from coal. Both their old and new configurations utilize 2-inch by 2-inch pieces of tdf. With the new capacity Arizona Portland could increase its capacity to over 3 million scrap tires per year. In 1990, Arizona Portland utilized approximately 1 million scrap tires (54). 

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California Portland Cenent (Arizona Portland) mill to, az 6-dry Mine 1 with PH/PC coal-fired 2 kllna Inactive In 1990. Past use 2 x2" 10X of energy from T0F TDF since 1986 No References 1 and 2... 

Telephone conversation with Dave Bittle, Arizona Portland Cement, June 1991. 

University of Wisconsin-Milwaukee University of Portland Trinity University University of Arizona... 

The development of strength with time for Portland cement is shown in Figure 2.9. The reactions give off a lot of heat (Figure 2.10). In very large concrete structures, such as the Hoover Dam at the Nevada-Arizona border in the United States, heat is a potential problem. Cooling pipes must be embedded in the concrete to pump the heat out. These pipes are left in place as a sort of reinforcement. In the case of the Hoover Dam, the construction... 

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