No abstract

No abstract

Vibration is a mechanical phenomenon in which oscillation occurs about equilibrium points. It is a displacement or movement in one direction and then back to again in the opposite direction. For example, the musical Instruments that may be plucked. With the passage or Era of time vibration has become major issue for the machinery and industries. Everyone knows that the vibration has some merits and demerits. But in modern technology age we can never eliminate whole vibrations in a machine. Some specific amount of vibration depending upon the quantity always remains there. This paper tries to focus on the analysis of the effects produced on the whirling shaft of different diameters while running at the different speeds. The objective of the study is to find the effect of different diameters rotating at different speeds on the amplitude and natural frequency of the shaft. Also forced vibration analysis of the shaft is done. Some parameters are also studied that are responsible for the failure of the system before breakdown, and the effect of the resonance frequency of the shaft. Using the vibscanner instrument a spectrograph is produced to the study the effects on amplitude and natural frequency of the whirling shaft. vibration factors on it. This spectrograph is transferred to computer with the help of OMNITREND to better analyze the data.

The pulverized coal injection (PCI) is pursued to reduce the hot metal production cost by replacing the expensive metallurgical coke with the non-coking coal. Increasing the PCI rate causes various difficulties in the blast furnace (BF) operation. In the present work, an attempt is made to review the various aspects of PC injection in BF such as the challenges with increasing the PCI rate and modifications in the injection system to circumvent the concerns related to higher PCI rate. Various methods for detecting the tuyere blockage and failure caused due to the high PCI rate are elaborated. The factors influencing the combustion of coal in front of tuyeres have been discussed and their impact in the replacement ratio has been discussed. Further, recommendations are made to improve the coal combustibility in front of tuyeres.

The advent of coke dry quenching (CDQ) in coke-making benefited coke plants not only in reducing coke moisture but also in extracting a part of the sensible energy within the hot incandescent coke with a reduction in environmental pollution. In addition to these direct benefits, other advantages include (1) improved coke quality, (2) enablement of higher coke production without compromising quality, (3) online coal-cake bulk density measurement, and (4) improved blast furnace performance. The present study at Tata Steel, Jamshedpur, concentrates on the assessment of these additional benefits when CDQ units were operated at full capacity. Besides, the article also focuses on reviewing the major obstacles faced during CDQ operation, such as clinker formation and coke flotation issues.