Herbert Leopold Gabryś
Power industry in Poland in 2020 ... as it is now and what next
Shown is the energy balance for the year 2019 in comparison with the previous year. Characterized are changes in generation volume of commercial power plants. Pointed out is the continuing tendency of the past years to reduce electric energy production by hard-coal fired power plants and especially the lignite ones. Noted is the fact that during the whole year 2019 there were no interruptions in power supplies resulting from generation deficiency. The ones that had place actually occurred due to distribution network failures mainly as a result of windstorms. In December 2019 the EC presented a proposal of the "European Green Deal" bringing a new EU climate concept. The "Polish Energy Policy until 2040" is not any longer compatible with it but prior to making the political commitment concerning its adoption there is a need of having the possibility to overview documents in the frames of the EC competences.
Keywords: power industry in Poland, energy balance for 2019, EU Green Deal climate concept
Ryszard Nowicki
Monitoring of turbine rotors eccentricity – differentiation in implementation of sensors
The measure of a shaft/rotor static deformation is its eccentricity. This kind of deformation is particularly dangerous in effects for machines with elastic rotors after reaching by them the rotational speed close to the first frequency of a rotor resonant vibrations. In the zone of resonant revolutions the rotors are additionally subject to dynamic deformations leading to the growth of a shaft axis straightness loss. The bigger is the rotor imbalance, the bigger is the dynamic deformation and the significant component of this imbalance can be an unwanted static deformation. The authors focus here exclusively on the problem of turbine eccentricity monitoring but the same problem may also concern some other types of rotating machinery transporting hot media like hot water pumps. In case of the need to monitor such machines the type of monitoring should be similar to the one used for turbines.
Keywords: turbine rotors, system for monitoring and eccentricity protection
Bartłomiej Dziubek
Situation on the power market after four main auctions
The subject of this article is identification of the structure of the contracted power volume as a result of power market main auctions in division into types of power market units, capital groups, duration of concluded power agreements and type of fuels used by power units as well as the identification of the structure of power agreements in relation to capital groups and type of fuels after taking into consideration multiannual contracts concluded in the earlier main auctions.
Keywords: power market, main auctions of the power market, power agreements' structures
Michał Kwiecień, Hanna Purzyńska
Strength properties and microstructure of TP347HFG austenitic steel after 40 000 hrs of operation in creep conditions
The newly built generating units are the boilers operating at supercritical, ultra-supercritical and advanced ultra-supercritical steam parameters. The increase of conventional generating units efficiency is connected with the increase of temperature and pressure of circulating medium which necessarily requires application of new construction materials. These materials are heat resisting austenitic steels and nickel alloys which can work at temperatures exceeding 600oC. As to the heat resistant austenitic steels, they were once produced in the way of modification of the typical 18/8 steel chemical composition. At present, in newly built boilers austenitic steels TP347HFG and Super304H as well as HR3C steel are applied. Presented are here the results of destructive testings of a secondary steam superheater piping segment made of TP347HFG steel and operated in creep conditions for more than 40 000 hrs.
Keywords: TP347HFG steel, destructive testing, secondary steam superheater pipe operated in creep conditions for more than 40 000 hrs
Bogumił Dudek
Basic dilemmas of social communication in the process of power network investment location
In this imaginative article referrring to basic dilemmas of social communication in the process of power network investment location the author applied the analysis of methods to argue for building new EHV power lines according to linguistic correctness logic created and introduced by the distinguished scientist Fr. Bocheński (1902-1995). This type of attitude has got the advantage of detaching from the so far used analytical methods and indicating the problems connected with intercommunication (dialog) that may be faced by either the investor or consultation participants interested in the investment location. Event analysis from meetings regarding numerous network investments in our country portrays unjustified social anxiety connected with an impact of electromagnetic fields on the environment.
Keywords: social communication, power network investments, power lines