Document 6wvwZaBrOZY8eNqBx2e5Jz87d

Old motors and new in a modern cement plant In the winter of 1926, an article in Powerfax stated that ci<'ht Elliott synchronous motors had recently been in stalled in Peerless Cement Corporation's Detroit plant. These included four 500-hp motors driving wet ball mills * and four 650-hp motors driving dry ball mills. Recentlv, while additional Elliott equipment was be ing installed in the plant, photographs of these old motors shown here were taken. Tt can easily be seen from the appearance of these 30-ycar-old motors that they have Itcen well maintained, and their service record shows that this maintenance has paid dividends. Since 1925, when these motors went into service, only one 500-hp motor has needed any major electrical repairs, even under this difficult service. The Peerless Cement Corporation was founded in 1897 and has plants in Detroit and Port Huron, Michigan. A view of the most recent Elliott 350-hp synchronous motor to be purchased by Peerless, taken in our Ridgway shop prior to shipment. It is the drive for a Bradley Hercules pulverizer mill. Due to the crowded location of this motor in the Peerless plant an installation photograph could not be taken. These two plants produce 4,000,000 barrels of cement clinker annually, approximately half at each plant. Also, from this point on until the cement is finally processed, the company has just recently purchased land for a new they have numerous dust collectors to keep dust to a plant in Detroit to produce an additional 1,000,000 minimum. Today the largest source of dust in the plant banels. It is interesting to note that while most cement is in the storage silos where dust is raised every time I plants are in remote locations because of the difficulty of cement is put in storage or taken out to the packhousc II dust control, one Peerless plant is now located within the where bagging machines package the cement for ship city limits of Detroit, and the new plant will also be with ment. However, the fact that the city of Detroit has given in the city limits. The plant is subject to a city air pollu a permit to the company to build a new plant inside the tion ordinance which allows no more than .3 of a grain of city limits is proof that Peerless has its dust problem dust per cubic foot of exhaust gas from the kilns. An under control. electric precipitator between the kiln exhaust fans and The largest piece of Elliott equipment to be installed the stack, operating at 95 percent efficiency, is reducing in a Peerless plant recently is a 350-hp, 400-rpm high- the grain loading well Mow .3 of a grain per cubic foot. torque synchronous motor driving a Bradley Hercules The kilns, of course, are not the only source of air pulverizer mill at Port Huron. There are also a large pollution in a cement plant. Since Peerless uses the wet number of smaller Elliott C-W motors on equipment in process in making cement, they do not have any dust the Peerless Detroit and Port Huron plants as well as a problems until the ingredients reach the kilns. However, surface condenser and deaerating heater.