The paper presents an application of the Finite Elements Method for stress and strain analysis of the hot water boiler structure. The aim of the research was to investigate the influence of the boiler scale on the thermal stresses and strains of the structure of hot water boilers. Results show that maximum thermal stresses appear in the zone of the pipe carrying wall of the first reversing chamber. This indicates that the most critical part of the boiler are weld spots of the smoke pipes and pipe carrying plate, which in the case of significant scale deposits can lead to cracks in the welds and water leakage from the boiler. The nonlinear effects were taken into account by defining the bilinear isotropic hardening model for all boiler elements. Temperature dependency was defined for all relevant material properties, i. e. isotropic coefficient of thermal expansion, Young’s modulus, and isotropic thermal conductivity. The verification of the FEA model was performed by comparing the measured deformations of the hot water boiler with the simulation results. As a reference object, a Viessmann - Vitomax 200 HW boiler was used, with the installed power of 18.2 MW. CAD modeling was done within the Autodesk Inventor, and stress and strain analysis was performed in the ANSYS Software
This study analyzes the energy management approach as one of the driving factors for sustainable development, not only in enterprises, but also countries. Sustainability of an enterprise is defined as its tendency to meet the need of customers and stakeholders through creative and innovative business strategies as well as activities that have a positive influence on society and environment. In this study, sustainability is measured through the application of an energy management system, but in the wood industry, which has an increasingly significant impact on the economic development in one country. The aim of this research is to determine the current situation regarding the application of energy management practices in production and service systems. The ISO 50001 standard for energy management systems considers the energy performance achieved by an enterprise. The connections between critical factors and the level of application requirements for the energy management system were statistically analyzed in this research. It was found that in enterprises that have a certified system of quality and environmental management, a higher level of energy management system implementation is evident. The research results provide data on the scientific level for the national policy improvement, as well as a developed model based on the Plan Do Check Act (PDCA) cycle for energy management system application.Sustainability 2020, 12, 76 2 of 16 one of the few economic activities that not only has a constant surplus in international trade, but has also been increasing every year. It is especially important for this country as one of the developing countries with an unstable economy.It is considered that the efficient use of wood products also includes material and energy flow not only in the economic sector, but also forestry, manufacturing, and construction, as well as waste management of the products. Manufacturing industries are considered to be the most analyzed systems for the development of these models [9][10][11][12], along with optimizing resources in the wood industry [13]. Leading to high production costs and limited material sources, significant progress has been made in achieving high system performance through innovative solutions for energy savings and the redesign of production processes [14][15][16]. The redesign of energy flows, especially in manufacturing, can significantly improve the overall life cycle environment performance of wood products [11].The basic factors that determine the production processes are certainly the price of energy and the cost of energy flows. It is noted that over 80% of energy needs in the industry are compensated by using fossil fuels [17]. Cost reduction is considered as one of the critical elements in proper energy management, because energy savings reduce production costs and increase profits [18]. Also, energy efficiency represents one of the key elements of sustainable development [19,20]. Especially important is the data that estimates that the energy consumption will increa...
There are successful and less successful maintenance systems (MS). As a dynamic category, the success of the maintenance function must be taken into consideration both for the present day and the future. This is the reason why it is necessary to continuously evaluate, improve and redesign MS. Business process modelling is a good methodology for this purpose. A business process model basically encompasses a formal description of the concept of the system, evaluation methods and process improvement techniques. This paper presents a concept of MS evaluation by using statistical process control in connection with performance indicators and MS improvement by modelling and simulation system. The maintenance model is used for simulation and experimentation. The simulation helps to visualise, understand, analyse and improve processes. The proposed concept is extendable and could be applied in different MS.
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