DE102012011707A1 - Controlled thermal and acoustic insulation structure for machine housing e.g. power station turbine housing, has isolation chambers that are filled or emptied with insulation materials or hot and cold mediums - Google Patents

Abstract

The insulation structure has isolation chambers (6-9) which are enclosed with machine housing (1). The chambers are filled or emptied with insulation materials or hot and cold mediums by pumping and suction processes.

Description

In order to operate machinery, in particular power plant turbines in their optimal thermal limits, they are encapsulated and thus thermally insulated. During maintenance work, however, the insulating panels must be dismantled and it takes some time until after shutdown, the cooling of the turbines has progressed so far that this can be done. For power plant gas turbines, this additional time required for inspection and inspection is about 24 hours.

On the other hand, the insulation with the currently common, multi-part fiberglass mats by no means ideal: it is almost inevitable that arise at transition points between the individual elements and their lack of form fit to the turbine housing air gaps, which lead to "stray" air currents - which in turn different hot zones , so-called "hot spots" trigger. This can cause significant damage if the thermal differences z. B. cause a delay of housing elements. This will include in WO2011 / 039050 described.

In addition, the problem of starting turbines requires a solution: turbines designed for maximum efficiency have very small clearances between guide vanes and turbine blades, which, however, are subject to strong expansion and contraction forces due to the high temperature differences between rest and full load. Therefore, when starting turbines, a set of exactly compliant sequences must be observed to prevent damage. This usually delays commissioning by hours and the same applies to the shutdown.

It is therefore an object of the present invention to provide a system with which, on the one hand, a better and, in particular, uniform comprehensive insulation is achieved, with which an uneven thermal loading of turbine elements is avoided, as well as a preheating or rapid cooling can be achieved to start - and reduce service times. In addition, increased sound insulation should be realized.

This is achieved according to the invention by using a housing capsule that is distanced to the machine housing, preferably of a modular design, and injected into or filled with insulating materials or, if required, also hot or cold air or liquid media.

Depending on the operating temperatures to be expected, different materials, in particular granules, but in particular volcanic perlites or aerogels, or else only ground blast-furnace slag, may be used as insulating materials. but are also conceivable liquids that foam at elevated temperature and z. B. collapse under radiation and then can be easily sucked off.

But even for insulating solids or granules, it is conceivable to speed up the emptying process, z. B. by the valves of the filling and emptying nozzle are opened alternately, and / or additional compressed air is blown. This way, not only the Entleeungsvorgang can be accelerated, it is caused by the resulting turbulence in Dead zones remaining materials whirled up and thus completes the emptying.

The invention is described below with reference to the drawing 1 described in more detail:

1 shows the schematic structure of a turbine housing 1 in longitudinal section, with its elements compressor housing 2 , Combustion chamber housing 3 , central turbine housing 4 and exhaust housing 5 , They are the isolation chambers that surround them 6 to 9 assigned via the inlet valves 10 to 13 filled by Einblase- and overpressure pumps (not shown) and using the exhaust valves 14 to 17 be emptied by vacuum pumps.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2011/039050 [0002]

Claims (8)

Regulated thermal and acoustic insulation of machine and equipment housings, in which one or more isolation chambers enclose the machine housing, characterized in that the chambers are filled or emptied by pumping and suction of insulation materials or hot and cold media. Controlled isolation of machine and equipment housings according to claim 1, characterized in that the insulation materials are structured granular or perlated. Controlled isolation of machine and equipment housings according to claim 2, characterized in that the granules or perlite are injected with an air flow in the insulation chambers. Controlled isolation of machine and equipment housings according to claim 2 and 3, characterized in that the granules or perlite can be sucked with Unterduck by a drain valve from the insulation chambers. Controlled insulation of machine and equipment housings according to claim 4, characterized in that injection and exhaust valves are operated in mutual rhythm to accelerate and complete the emptying of insulating solids, as well as perlites and granules by whirling. Controlled isolation of machine and equipment housings according to claim 1, characterized in that the insulating materials consist of foams of liquid media or contain them. Controlled isolation of machine and equipment housings according to claim 6, characterized in that the foaming agent under defined thermal conditions or under the influence of electromagnetic radiation foam or liquefy and the insulation chambers thus can be easily filled or emptied. Controlled isolation of machine and plant housing according to claim 1, characterized in that the isolation chambers emptied for rapid temperature control of the turbine housing and can be quickly filled or emptied with steam or hot and cold air, or appropriately tempered liquid media.

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