Analysis of the electricity production potential in the case of retrofit of steam turbines in a district heating company

Improvement of the energy conversion processes efficiency helps to achieve a more reliable energy supply, a cleaner environment, more competitive businesses, and higher living standard. Industry data indicate significant potential for improving the efficiency of steam systems and minimizing their operating costs by implementing various measures. The present work is a result of a systematic approach for energy performance analysis and identification of opportunities for optimizing the steam-condensate system of the combined heat and power plant ESM Energetika, Skopje, R. N. Macedonia. The boiler plants provide superheated steam used in a hot-water station for the district heating system, for electricity generation, and as process steam for industrial customers. As the main operating costs of the plant stem from the natural gas consumption, the implementation of a set of energy efficiency measures will lead to its reduction, accompanied by less environmental impact. As a result of the system analysis, a number of energy efficiency measures have been identified. For each measure, the impact on individual parts of the system, as well as on the system as a whole, is evaluated using the Steam System Modeler Tool. This paper elaborates some of the identified measures that are considered more reliable from an operational and financial aspect, mainly focused on steam production for the district heating system. Based on a conservative approach, significant potential for savings of natural gas, electrical energy, and treated water is estimated, which will lead to annual financial savings of about 245000 Euro.

Section: Case Study: Optimisation Of a Complex Steam Systemmentioning

confidence: 99%

Steam system optimization of an industrial heat and power plant

Filkoski

Lazarevska

Mladenovska³

et al. 2020

“…Arrows labelled with + represent inputs to a component of the system; arrows labelled with -represent withdrawals from a component Electricity market prices have increased rapidly in recent years, which makes important to produce and sell additional electricity because this is an important factor in determining a heating plant's profitability [24]. Recently, Finland has decided to support the sales price of electricity from CHP plants so that the market price will remain constant, thereby encouraging the production of electricity and its input into a district's electrical network.…”

Section: Figure 1 Dynamics Of the Energy-resource Inventories For Anmentioning

confidence: 99%

Tactical techno-economic analysis of electricity generation from forest, fossil, and wood waste fuels in a heating plant

Palander

Vesa²

2012

The Finnish energy industry is subject to policy decisions regarding renewable energy production and energy efficiency regulation. Conventional electricity generation has environmental side-effects that may cause global warming. Renewable fuels are superior because they offer near-zero net emissions. In this study, we investigated a heating mill's ability to generate electricity from forest fuels in southern Finland on a 1-year strategic decision-making horizon. The electricity-generation, -purchase, and -sales decisions are made using three different energy efficiency and forest technology rates. Then the decision environment was complicated by the sequence-dependent procurement chains for forest fuels (below-ground) on a tactical decision-making horizon. With this aim, fuel data of three forest fuel procurement teams were collected for 3 months. The strategic fuel procurement decisions were adjusted to the changed decision environment based on a tactical techno-economic analysis using forest technology rates. The optimal energy product and fuel mixtures were solved by minimizing procurement costs, maximizing production revenues, and minimizing energy losses

“…There are number of researchers who carried out similar numerical research: Bachschrid [5], Goldman [6], Watanabe [7], Takahashi [8], Thikhimporn [9], Bialik [11], Krok [15], Ota [16], Babic [17], and Manea [18]. The above mentioned numerical studies were performed according to their own mathematical models and with its own software programs.…”

Section: Mathematical Modelmentioning

confidence: 99%

Numerical and experimental aspects of thermally induced vibration in real rotors

Jevtic¹,

Radovanovic

Adamović

2011

Temperature fields in electric energy generators may lead to mechanical dissbalance of an already balanced rotor. The author collected information in a number of steam power plants and confirmed the existence of the problem. This paper presents the specific case of thermal deformation of the rotor, caused by an asymmetrical temperature field in scale of rotor. On the grounds of the relevant physical aspects, we proposed a mathematical model identifying fields in a turbo generator rotor and suggest the optimum control by which the unwanted effects are eliminated.