Vattenfall

About: Vattenfall is a company organization based out in Stockholm, Sweden. It is known for research contribution in the topics: Wind power & Combustion. The organization has 685 authors who have published 857 publications receiving 18912 citations. The organization is also known as: Vattenfall AB & Kungliga Vattenfallstyrelsen.

Regulation parameters impact on distribution business revenue with focus on differences between urban and rural areas

Abstract: The regulation of electricity distribution differs between the countries in Europe, giving different conditions for the actors on the market. The regulation methods are using different types of parameters to estimate the reasonable level of the distribution service tariffs and revenue. The choice and valuation of parameters are of ultimate importance for regulation of electricity distribution. The objective of this paper is to identify the basic factors of low voltage networks, and determine the differences in value and costs for operating a low voltage network in an urban and rural network. This will indicate those aspects which are relevant to consider in the regulation of electricity distribution revenues and tariffs. The comparison of the regulation methods in different European countries will also indicate in what way the regulation on the European market has to change to reflect the electricity distribution business in a significant way.

Method and device for automatic completion of casing joint at high line voltage

Abstract: The apparatus of the present invention comprises two parts; an apparatus for automatically installing the supplemental (shunt) joint, and the shunt joint itself. The shunt joint provides both mechanical and electrical connection between two ends of an electrical cable, augmenting the existing joint which may remain in place. The installation device comprises a frame which may be lifted into place over the power line by a crane or helicopter. The frame is provided with a first linear actuator for placing at least first and second wedge elements fitted at each end of an existing socket joint. The frame also comprises a second linear actuator for placing first and second wedge sockets at least partly surrounding the line and cooperating with corresponding wedge elements. At least one threaded shaft, powered by an actuator motor, is provided to pull together the wedge sockets with the wedge elements. Together, the wedge elements and wedge sockets surround and lock around the line at each side of the socket joint. Once locked around the line, the coupling between the actuator motor and the threaded shaft may be severed, and the frame and associated elements removed from the line. The wedge elements and wedge sockets, clamped around the line, remain. The wedge sockets are firmly tied together across the existing joint by the one or more threaded shafts, forming a mechanical as well as electrical shunt joint in parallel to the existing joint.

Method for operating of gas and steam turbine power plant entails setting average value of mass flow of combustion gas branch flow to control valve in relation to average stochastic mass gas flow fluctuations after gasification plant

Abstract: The method is for the operating of a gas and steam turbine power plant includes a coal gasification plant (1), gas conditioning plant (3), a gas turbine plant (15) with a control valve (14), and a steam turbine plant (16). The average value of the mass flow of a branching partial flow (5) from the combustion gas flow (2) to the control valve is set within a range of 1.5 to 5 times the average stochastic mass flow fluctuations of the combustion gas flow after the coal gasification plant. The momentary value of the mass flow of the branching partial flow is adjusted to the momentary stochastic mass flow fluctuations of the combustion gas flow after the gasification plant so that the momentary stochastic calorific flow fluctuations of the combustion gas flow before the control valve is percentage-wise smaller than the momentary stochastic mass flow fluctuations of the combustion gas after the gasification plant.

Process for the treatment of gas phase alkaline chloride in a combustion plant, combustion plant for carrying out the process, and the use of a phosphorous substance for the treatment of alkaline chloride in gaseous phase in a combustion plant

Abstract: A process for the treatment of gas phase alkaline chlorides in a combustion plant that is arranged for combustion of solid fuel and which includes a combustion chamber from which a flue-gas flow is directed to pass a heat transfer device. A phosphorous substance is added to the flue-gas flow, separate from the fuel, the substance chosen from a group of substances that form phosphorous oxide at combustion temperatures of approx. 500° C. or above, wherein the phosphorous substance is distributed in the flue-gas at a location upstream of the heat transfer device. The phosphorous substance is added to an amount which results in phosphatising of gas phase alkaline chlorides included in the flue-gas flow before the chlorides reach the heat transfer device. A corresponding combustion plant is disclosed, as well as the use of a phosphorous substance for phosphatising alkaline chloride in gaseous phase in a flue-gas flow.