Pub Date : 1900-01-01DOI: 10.1109/CITCON.2001.934101
R. Dolores A, M.F. Moran L
The cement plant La Cruz Azul SCL is located in the center of Mexico, about 70 km north of Mexico City. The management of Cruz Azul established objectives in all its departments to reduce production costs. The optimization department and the management agreed to give major support to the projects, and the heads of departments committed themselves to develop new ideas to lower the production costs of the different processes by using the latest technology (if necessary) available on the market. The experience of the authors' department of optimization suggested focusing on new fans as a relevant area. These fans are widely used during various steps of the process, and the possibility to analyze this would mean a change of the flow from these dampers to variable speed drives. The large capacity fans have two medium voltage motors and with dampers to lower the flow capacity of the fans to a range of 60-80%. The fast advancing new technology of variable speed drives of medium and low voltage, where the equipment becomes more and more efficient and cheaper, contributes to the profitability of the projects to be carried out. Cruz Azul saw the opportunity to use two exhaust fans of 1000 HP in kiln 8. This paper shows the development of the projects, from the beginning of the analysis to the application.
La Cruz Azul SCL水泥厂位于墨西哥中部，墨西哥城以北约70公里处。Cruz Azul的管理层在所有部门制定了降低生产成本的目标。优化部门和管理层同意为项目提供主要支持，部门负责人承诺通过使用市场上可用的最新技术(如有必要)来开发新的想法，以降低不同工艺的生产成本。作者所在的优化部门的经验建议将关注新粉丝作为一个相关领域。这些风扇在过程的各个步骤中被广泛使用，分析这一点的可能性意味着从这些阻尼器到变速驱动器的流量变化。大容量风扇有两个中压电机，并带有阻尼器，可将风扇的流量降低到60-80%。快速发展的中低压变速驱动新技术，使设备变得越来越高效和便宜，有助于项目的盈利能力。Cruz Azul看到了在8号窑使用两个1000马力的排气扇的机会。本文展示了该项目的开发过程，从最初的分析到实际应用。
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Pub Date : 1900-01-01DOI: 10.1109/CITCON.2001.934110
R. J. Schmidt
The vertical pendulum mill has been used in the nonmetallic mineral industry for over one hundred years to grind natural minerals such as limestone, gypsum, barite and bentonite. Petroleum coke is ideally suited to be ground in this type of grinding mill. Before investigating this application, the author describes what this mill is, how it works, and what that makes it capable of grinding this wide array of minerals. The vertical pendulum mill gets its name from the fact that the grinding rolls are suspended from a horizontal plate that rotates about a central vertical shaft arrangement. Centrifugal force causes the journal to pivot at the attachment point to the horizontal plate. This action resembles the motion of a pendulum, hence the name vertical pendulum mill (in the industrial minerals field, this mill is also known as a roller mill). The grinding action of the pendulum is considered true rolling grinding because material is forced between a stationary ring and a rotating grinding roll.
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