One of the most serious problems encountered in Naval steam plants following World War II was the unreliable performance of boiler and main feedpump pneumatic control systems. In addition to control component and syst...
One of the most serious problems encountered in Naval steam plants following World War II was the unreliable performance of boiler and main feedpump pneumatic control systems. In addition to control component and system design deficiencies, these control systems suffered from inadequate methods to measure and adjust system alignment. This paper describes the development of a set of procedures for on-line alignment verification (OLV) of pneumatic main boiler and feedpump control systems. The procedures are designed for use by N avy control system technicians and, in addition to on-line alignment verification, provide guidance for troubleshooting and for performing system alignment. Procedure static checks measure steady state steaming performance and OLV procedure dynamic checks measure the ability of the boiler and control systems to respond to load changes. The paper describes typical control system characteristics that influence OLV procedure content and the supporting analysis that was used to establish alignment criteria ranges that satisfy both steady state and transient performance requirements. Also described is the alignment criteria tolerance analysis along with the steps involved in a typical OLV check procedure development. Descriptions of the various OLV checks, troubleshooting procedures and alignment procedures are provided. Typical shipboard implementation requirements are described and experience to date with the procedures is provided along with a status report on OLV procedure implementations.
The work is devoted to developing a technological package “drying unit” using a multistage gravitational dryer as the main equipment. The study aims to create a workable sample of a drying module and propose an algo...
The work is devoted to developing a technological package “drying unit” using a multistage gravitational dryer as the main equipment. The study aims to create a workable sample of a drying module and propose an algorithm for its industrial implementation. The work uses methods of analysis and synthesis, search for cause-and-effect relationships, theoretical and computer modeling, and experimental studies. The main stages of drying granular materials in a multistage gravitational shelf dryer are described. The tools of influence of the design features of the dryer on the nature of the flow of each stage of the drying process are shown. A variant of the technological scheme of the drying unit and the scheme of automation of the drying process are presented. A set of solutions is proposed for monitoring the technological level of readiness of the ”drying unit” package for industrial implementation. A marketing strategy for the transfer of drying technology using a multistage dryer is described. The result of the study is a roadmap for developing and implementing a drying module using devices with active hydrodynamic modes.
作者：
Kopal IvanKoštial PavolValíček JanHarničárová MartaJančíková Zora1VŠB-TU Ostrava
Faculty of Mining and Geology Institute of Physics 17. listopadu 15 708 33 Ostrava-Poruba Czech republic 2TnUAD of Trenčin
Faculty of Industrial Technologies in Puchov Department of Numerical Methods and Computing Modelling I. Krasku 491/30 Slovakia 3VŠB-TU Ostrava
Faculty of Metallurgy and Materials Engineering Department of Material Engineering 17. listopadu 15 708 33 Ostrava-Poruba Czech republic 4VŠB-TU Ostrava
Institute of Clean Technologies for Mining and Utilization of Raw Materials for Energy Use 17. listopadu 15 708 33 Ostrava-Poruba Czech republic 5VŠB-TU Ostrava
Faculty of Metallurgy and Materials Engineering RMTVC 17. listopadu 15 708 33 Ostrava-Poruba Czech republic 6VŠB-TU Ostrava
Faculty of Metallurgy and Materials Engineering Department of Automation and Computing in Metallurgy 17. listopadu 15 708 33 Ostrava-Poruba Czech republic
The present work is focused on the analysis of the temperature dependence of thermophysical parameters of polymeric nanocomposites based on a thermoplastic polyurethane matrix filled with different amounts of single-w...
The present work is focused on the analysis of the temperature dependence of thermophysical parameters of polymeric nanocomposites based on a thermoplastic polyurethane matrix filled with different amounts of single-walled carbon nanotubes of high purity. The temperature dependence of thermal conductivity, thermal diffusivity, and specific heat capacity were analysed in a wide temperature range. The regression models of experimental data showed a good agreement with physical models based on the quantum interpretation of thermal transport phenomena in the solid materials above the Debye temperature. The temperature dependences of all three investigated thermophysical parameters showed the secondary relaxation transition that occurred in all tested nanocomposite materials. Moreover, the first-order exponential model for the dependence of investigated thermophysical parameters on the amount of single-walled carbon nanotubes in the thermoplastic polyurethane matrix at standard temperature and pressure has been created.
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