Influence of Operational Costs and Energy Carrier Prices on Market Value of Privatised CHP Stations
Energetyka 2006, No. 3, p. 155, 1 fig., 2 tab., 6 refs
Operational costs and energy carrier prices influence largely the market value of privatised CHP stations. Decrease of an employment great excess, even by a dozen or so percent only, with simultaneous increase of the heat and electricity prices by several percent and decrease of the domestic coal price by several percent can cause the increase of the market sale price of privatised CHP stations by more than 50%. It is in the interest of State Treasury to restructure the heat and electric energy sources before their sale. Privatisation of the national power industry due to bad technical condition of aged power stations and CHP stations is an absolute necessity. It should be proceeded however within the capital market, but not in the way of "giving out" to the eastern concerns or capital groups and giving the 15% shares out to the employees of privatised power stations and CHP stations. The price of such a "giving out" is flagrant low.
Will Coal Fired Power Stations Be Able to Limit CO2 Emission?
Energetyka 2006, No. 3, p. 163, 8 figs, 7 tabs, 24 refs
Utilisation of the chemical adsorption for removing of CO2 from the flue gas in power stations being under operation at present is possible, but it should cause the increase of costs of generated electricity by 70%. Utilisation of coal gasification for the chemical adsorption of CO2 is possible only by complete re-construction of the power station (replacement of the boiler and steam turbine by the IGCC unit). Aerobic combustion creates a possibility of CO2 sequestration, and it could be considered in the aspect of existing power stations. However, as a condition is here the implementation readiness of this technology. Hydrogen as a fuel for power engineering is more expensive than fossil fuels.
TRZESZCZYŃSKI J., GRZESICZEK E., BRUNNÉ W.
Effectiveness of Solutions Extending Operation Time of Long Operated Cast Steel Elements of Steam Turbines and Steam Pipelines. Operational Experiences
Energetyka 2006, No. 3, p. 179 (Pro Novum Bulletin p. 1), 3 tabs, 6 refs
Extending the operational time of steam turbine casings and steam pipelines through the re-vitalisation of the cast steel turbine elements and modernisation of the pipelines has been proved completely effective. It means that economic benefits connected with this technology, i.e. only 20% of labour costs in relation to the replacement, extension of periods between overhauls and limiting to minimum technical maintenance costs, can be recognised as obvious. Mentioned benefits cause, that these solutions are being continuously in a centre of interest of numerous domestic and foreign power stations.
DOBOSIEWICZ J., ADAMEK J.
Assessment of Technical State of Generator Rotor Caps
Energetyka 2006, No. 3, p. 184 (Pro Novum Bulletin p. 6), 2 figs, 2 tabs, 6 refs
Discussed are kinds and reasons of failures and methods of their detection used in the world power industry and for many years in the national power industry. Numerous failures of the rotor caps detected up-to-date predominately have a corrosion character; they strike also steels treated as corrosion resistant, e.g. the steel of the 18.18 type. Preventing failures of this kind consists in periodical non-destructive tests and use of pertinent repair just in time. In the national power industry, thanks to regular tests used for forty years, there occurred no turbogenerator failure caused by the cap blow-out. Character and kind of detected defects, methods and required frequency of tests of the caps being under operation and ways of the cap repair are discussed.
Usefulness of Non-destructive Tests for Life Time Forecasting of HP Steam Pipelines
Energetyka 2006, No. 3, p. 187 (Pro Novum Bulletin p. 9), 2 figs, 4 tabs, 11 refs
In Pro Novum have been conducted for many years non-destructive tests of materials for pipelines after a long lasting operation. The static tests of the extension for the quintuple samples, as well as the resistance test for the micro-samples, structural and metallographic tests, hardness measurements and impact tests have been made. Shortened tests of the creeping have been made also. The paper tries to summarise the knowledge in this field.
High-temperature Corrosion of Boiler Superheater Coils
Energetyka 2006, No. 3, p. 197 (Pro Novum Bulletin p. 19), 7 figs, 2 tabs, 7 refs
A division of high-temperature corrosion according to the material destruction process of the pipe is introduced. This division is aimed to identification of the failure main reason of superheaters and to presentation of the temperature influence and the influence of alkali compounds on corrosion processes. Given are differences between the corrosion arisen as an action effect of aggressive compounds on metal surfaces (ash corrosion) and the corrosion with strengthened material oxidation in high temperatures as a main mechanism of it creation (high-temperature oxidation).
TRZESZCZYŃSKI J., GRZESICZEK E., PATYK K.
Repair by Welding of Rotor Blade System of 13UP110 HP Steam Turbine Rotor
Energetyka 2006, No. 3, p. 201 (Pro Novum Bulletin p. 23), 23 figs, 5 tabs, 1 ref.
The way of the rotor repair, proposed by Pro Novum, consisting among others in reconstruction of rivets by the welding has been proved as more attractive for clients than an alternative approach consisting in the blade shortening. Two indisputable advantageous features of the first approach have decided: emphatically lower price and a target solution of the problem. The rotor after repair described in the paper, small-rotation balancing and mounting in the turbine operates since the end of the August 2005. Similar repairs with the rivet reconstruction by the welding have been made for many years. No problems connected with unsatisfactory durability of such repairs have been occurred up-to-date.
ŚCIĄŻKO M., ZUWAŁA J., PRONOBIS M.
Advantages and Drawbacks of Co-combustion of Bio-mass in Power Boilers at the Background of Operational Experiences of First Year Bio-mass Co-combustion in the Industrial Scale
Energetyka 2006, No. 3, p. 207, 14 figs, 5 tabs, 30 refs
Discussed are phenomena accompanying the co-combustion process in power boilers of bio-mass and wastes able to be biodegraded. On the base of the analysis of investigation results of the operation of several power boilers co-combusting the bio-mass together with essential fuels identified are essential advantages and the technological menaces arisen from the co-combustion implementation. The main power and ecological aspects accompanying the co-combustion processes of the bio-mass and conventional fuels are presented. Presented are exemplary comparison characteristics of changes of particular elements of the power balance in the investigated boilers, with reference of the bio-mass co-combustion process to the combustion of so called base coal. Defined are indices of the impurities emission to the air and presented is comparing assessment of a grade of lowering the total emission of harmful substances to the atmosphere.