Method for producing steam generator tubes
a technology of steam generator and tube, which is applied in the direction of wire springs, other domestic objects, light and heating apparatus, etc., can solve the problems of film boiling risk and destruction of heating surfaces, and achieve the effect of high degree of efficiency, simple manufacturing process and high level of flexibility
Inactive Publication Date: 2013-04-11
SIEMENS AG
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Benefits of technology
The invention relates to a method for producing steam generator tubes that allows for a simple manufacturing process and high flexibility in the materials used to achieve high efficiency of a steam generator. This is achieved by using an insert with swirl-inducing inserts that can be selected independently from the tubes. The insert is fixed in place using a former shaft which simplifies fitting in the steam generator tube. The insert can be produced economically using a former shaft and alloy steels with higher chromium content suitable for high steam parameters. The method is attractive even for materials with less than 5% chromium.
Problems solved by technology
Even at high heat flow densities, the use of tubes with internal ribbing may be necessary (in drum-type boilers, for example): In this situation there is the risk of film boiling, i.e. a film of steam forms on the inside of the steam generator tubes, which, in contrast with well-mixed fluid, has a high heat-insulating effect in the event of bubble or nucleate boiling.
The consequence of this is that, while the heat flow density remains the same, the wall temperature may rise sharply, which can lead to the destruction of the heating surfaces.
Method used
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Embodiment Construction
[0024]FIG. 1 shows a former shaft 1 which is provided in a main area 2 with grooves 4 running around the shaft in helical fashion. In this case the grooves 4 are arranged in the form of a threefold helix around the cylindrical body of the former shaft 1. Depending on the desired profile of the insert which is to be produced, the grooves 4 can also be embodied as a helix having almost any desired number. Depending on the requirement, the desired grooves 4 can be produced individually (number, pitch, dimensions) by means of a metal-cutting machining process. The length of the main area 2 of the former shaft 1 is slightly greater than the smooth tube into which the insert is intended to be introduced. The main area 2 of the former shaft 1 is followed in the axial direction by a connection area 6 which is not provided with grooves 4 and which serves to handle the former shaft 1 during the method according to the invention.
[0025]FIG. 2 shows the former shaft 1 in section, in a magnified ...
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Abstract
A method for producing steam generator tubes is provided. The method is intended to allow a technically particularly simple production process and at the same time allow particularly high flexibility with regards to the materials that may be used to achieve a particularly high efficiency of a steam generator. For this purpose, an insert is fixed in slots of a former shaft, the former shaft with the insert is introduced into a steam generator tube, the fixing of the insert on the former shaft is released and the former shaft is removed again from the steam generator tube.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the US National Stage of International Application No. PCT / EP2011 / 057426, filed May 9, 2011 and claims the benefit thereof. The International Application claims the benefits of European Patent Office application No. 10164426.8 EP filed May 31, 2010. All of the applications are incorporated by reference herein in their entirety.FIELD OF INVENTION[0002]The invention relates to a method for producing steam generator tubes.BACKGROUND OF INVENTION[0003]A steam generator is a closed, heated vessel or a pressure pipe or tube system which serves the purpose of producing steam at high pressure and high temperature for heating and operational purposes (e.g. for the operation of a steam turbine). With particularly high steam capacities and pressures, such as, for example, during energy production in power stations, water-tube boilers are used in which the flow medium, usually water, is located in steam generator tubes. Water-tube...
Claims
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IPC IPC(8): F22B37/18B21F3/06B21C37/26
CPCF22B37/10F22B37/103B21F3/06B21C37/26F22B37/18F22B29/06B21F3/04
Inventor BRUCKNER, JANEFFERT, MARTINFRANKE, JOACHIMKLEMM, LARS
Owner SIEMENS AG