scholarly journals Scientific and Methodological Bases of Exergetic Analysis of the Processes of Heat Treatment of Concrete Products in Heat Technology Installations. Part 2

2021 ◽  
Vol 64 (4) ◽  
pp. 328-335
Author(s):  
V. N. Romaniuk ◽  
A. M. Niyakovski
Keyword(s):  
Heat Treatment ◽  
Power System ◽  
Thermodynamic Efficiency ◽  
Technological Equipment ◽  
Heat Power ◽  
Degree Of Hydration ◽  
Operating Modes ◽  
Heat Technology ◽  
Exergetic Analysis ◽  
Selection Of

This article is the second part of the research devoted to the exergetic analysis of heat treatment processes of concrete products in heat technology installations. In the first part, the issues of calculating the exergy of a concrete mixture and hardening concrete have been considered, taking into account all the components of the exergy, viz. reaction, concentration and thermomechanical ones. In the present part of the study, exergetic criteria are proposed that make it possible to evaluate the energy efficiency of the operating modes of heat-technological equipment for the heat treatment of concrete products. These include the degree of thermodynamic perfection of a heat-power system, which is used to evaluate the completeness of the use of the exergetic input; thermodynamic efficiency of the system of heat treatment of concrete products in heat technology installations, representing the degree of thermodynamic perfection of the heat power system that is calculated without taking into account all the components of the sum of transit exergies; thermodynamic efficiency of the heat treatment system, taking into account the exergetic efficiency of the system of heat energy production and transportation; the degree of technological perfection that indicates at the portion of the exergy supplied to the heat technology installation for the heat treatment of concrete products is intended to obtain a technological result. To calculate the listed indicators and characteristics, a mathematical apparatus is proposed that takes into account the mass of the concrete product, the specific mass exergy of cement and hardening concrete, the specified degree of hydration of cement in concrete at the end of heat treatment, the exergetic flows supplied to the product in a heat technology installation during its heat treatment, and numerical indicators characterizing the incompleteness of the cement hydration process. The results obtained in this paper are discussed from the viewpoint of their applicability in the selection of heat treatment modes. They can be used in the selection of energy-saving modes of heat-technological equipment for industrial heat treatment of concrete products.

scholarly journals DYNAMIC LOAD REDUCTION DEVICE IN MACHINE DRIVE WITH SPRING AND SELECTION OF ITS PARAMETERS

2021 ◽  
Vol 297 (3) ◽  
pp. 87-93
Author(s):  
Yuri Kovalyov ◽  
◽  
Sergey Pleshko ◽  
Evgeny Lopukhov ◽  
◽  
...  
Keyword(s):  
Dynamic Loads ◽  
Practical Significance ◽  
Process Equipment ◽  
Technological Equipment ◽  
Light Industry ◽  
Torsion Spring ◽  
Operating Modes ◽  
Start Up ◽  
Dynamic Loadings ◽  
Selection Of

The peculiarity of the technological equipment of light industry is the significant dynamic loads that occur during unstable operating modes and is one of the main reasons for reducing the reliability and durability of its operation. The problem of increasing the reliability and durability of their work by reducing the dynamic loads is relevant, because the known means of reducing the dynamic loads in the drive of machines can not always be used in light industry machines. Therefore, when designing light industry equipment, first of all, attention should be paid to reducing the dynamic loads in the drive and preventing accidents. The paper considers the feasibility of using a device with a torsion spring to reduce the dynamic loads in the drive of process equipment, check its performance and develop a method for selecting rational parameters. In the course of work modern methods of researches of mechanical systems are used for the purpose of an estimation of expediency of use of the device with a torsion spring for reduction of starting dynamic loadings in the drive of machine. On the basis of the analysis of features of work of the technological equipment of light industry the expediency of use in the drive of cars of the gear safety coupling with a torsion spring is established. A new design of the device is proposed to reduce the dynamic loads that occur during machine start-up. Unlike the known devices, the proposed device is made in the form of a toothed safety clutch with a torsion spring, which simplifies its design and increases efficiency. The use of a cylindrical torsion spring as an elastic element, which connects the half-clutch to the flange on which the satellite gears are mounted, prevents overloading of the drive and the choice of rational rigidity of the device depending on the change of operation, which increases its durability and expands performance. The method of checking the efficiency of the device for reducing dynamic loads and selecting its rational parameters is presented. The scientific novelty is the development of scientific bases and engineering methods of designing devices to reduce dynamic loads in the drive of technological equipment. The practical significance lies in the development of a new design of the device to reduce the dynamic loads in the drive of machines and the engineering method of choosing its rational parameters.

scholarly journals Scientific and Methodological Bases of Exergetic Analysis of the Processes of Heat Treatment of Concrete Products in Heat Technology Installations

2021 ◽  
Vol 64 (3) ◽  
pp. 259-274
Author(s):  
V. N. Romaniuk ◽  
A. M. Niyakovskii
Keyword(s):  
Heat Treatment ◽  
Power Systems ◽  
Concrete Mixture ◽  
Technology Support ◽  
Mixture Flow ◽  
Heat Technology ◽  
Absolute Energy ◽  
Scientific Results ◽  
Exergetic Analysis

Having proven its effectiveness in finding the best options for energy supply and energy consumption the exergetic method of thermodynamic analysis of complex heat and power systems has been widely recognized in recent years. However, its application is hindered by the lack of appropriate scientific and methodological heat technology support, especially if their application involves not only transformation of energy, but also transformation of substances. Heat treatment of concrete and reinforced concrete products belongs to such technologies. This article presents new scientific results related to the development of exergetic balances of the processes of preparation of concrete mixture in a mixer and heat treatment of a concrete product in a heat-technological installation. For each of these cases, the analysis of exergetic flows was carried out, the structure of the exergy of the concrete mixture and the hardening concrete was determined. Based on the analysis of the literature data on the chemical composition of cement clinkers, cements, and hydration products, new dependences have been proposed for calculating the exergy of the concrete mixture flow and the exergy of concrete under its heat treatment, including all their components, viz. thermomechanical, reaction, and concentration constituents. Absolute energy indicators have been developed. The calculation of the mentioned values was performed on a specific example with the use of the developed scientific and methodological support. In the second part of this paper, the results of the study related to the determination of relative exergetic indicators that allow evaluating the energy efficiency of the processes of heat treatment of concrete products in heat technology installations will be published. The results obtained in this paper can be used for the selection of energy-saving modes of heat-technological equipment intended for industrial heat treatment of concrete products.

BÖHLER W403 VMR

Alloy Digest ◽  
2013 ◽  
Vol 62 (9) ◽  
Keyword(s):  
Heat Treatment ◽  
Chemical Composition ◽  
Physical Properties ◽  
Tool Steel ◽  
Raw Materials ◽  
Heat Treating ◽  
Diffusion Annealing ◽  
Selection Of

Abstract Böhler (or Boehler) W403 VMR is a tool steel with outstanding properties, based not only on a modified chemical composition, but on the selection of highly clean raw materials for melting, remelting under vacuum (VMF), optimized diffusion annealing, and a special heat treatment. This datasheet provides information on composition, physical properties, and elasticity. It also includes information on forming and heat treating. Filing Code: TS-721. Producer or source: Böhler Edelstahl GmbH.

scholarly journals Wind Power Accommodation Method for Regional Integrated Heat-Power System Considering Generation and Load Uncertainties

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Dongmei Yang ◽  
Zhihong Yang ◽  
Guoxin He ◽  
Jian Geng ◽  
Junjie Ligao
Keyword(s):  
Power System ◽  
Wind Power ◽  
Heat Power

Simulation study on a novel solar aided combined heat and power system for heat-power decoupling

Energy ◽  
2021 ◽  
Vol 220 ◽  
pp. 119689
Author(s):  
Zeyu Ding ◽  
Hongjuan Hou ◽  
Liqiang Duan ◽  
Chang Huang ◽  
Eric Hu ◽  
...  
Keyword(s):  
Power System ◽  
Simulation Study ◽  
Combined Heat And Power ◽  
Heat Power ◽  
Power Decoupling

Selection of emitter material for application on a radioisotope thermophotovoltaic (RTPV) power system

1997 ◽  
Author(s):  
D. P. Kramer ◽  
N. D. Frohlich ◽  
F. A. Koehler ◽  
J. D. Ruhkamp ◽  
R. G. Miller ◽  
...  
Keyword(s):  
Power System ◽  
Selection Of

Influence of the cost of technological equipment of body production on indicators of efficiency of working processes

2021 ◽  
pp. 28-32
Author(s):  
Keyword(s):  
Quality Index ◽  
Production Efficiency ◽  
Statistical Data ◽  
The Body ◽  
Technological Equipment ◽  
Production Body ◽  
Body Production ◽  
The Cost ◽  
Efficiency Indicators ◽  
Selection Of

The possibilities for the development of bodywork in the context of the growing level of competition are analyzed in the article. The technological processes of bodywork are considered and the problem of choosing technological equipment is indicated. The statistical data about the efficiency indicators of company body divisions, operating in the body repair market in Krasnoyarsk, are presented. A composite quality index for the equipment of the bodywork department (using the example of body stocks) is proposed and calculated, and on its basis, some recommendations are given for companies which plan to enter the market of body repair services. Keywords: body production, body repair, body equipment, body production efficiency, selection of technological equipment

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