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Controlling variables in boiler pressure vessels

A boiler pressure and container technology, applied in the field of variable systems, can solve problems such as limiting the rate or quantity of starting, increasing negative stress, etc.

Pending Publication Date: 2018-12-18
GENERAL ELECTRIC TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a given barrel diameter, positive hoop stress (tension) can be reduced by increasing the thickness of the barrel wall, but this increases negative stress due to temperature across the wall at actuation, and limits the rate of actuation or quantity

Method used

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  • Controlling variables in boiler pressure vessels
  • Controlling variables in boiler pressure vessels
  • Controlling variables in boiler pressure vessels

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0015] now refer to figure 2 , an exemplary embodiment of a steam drum of a boiler is shown generally at 10, and is hereinafter referred to as "drum 10" or "steam drum 10". The drum 10 may be from a natural circulation boiler, an auxiliary circulation boiler or any other type of boiler. The cartridge 10 has an elongated cylindrical shape and has a wall 12 pierced by nozzles 14 which receive a high temperature vapor / liquid mixture and discharge this mixture to the cartridge liner or partition 18 and the inner surface 15 of the wall 12 In the annular space 16 between. Wall 12 also has an outer surface 17 . The nozzle 14 may extend beyond the inner surface 15 of the wall ( figure 2 ) or they may terminate at the inner surface 15 ( image 3 ). A liquid 26 , such as water, for example, accumulates in the bottom of the cartridge 10 . One or more vapor separation units 24 are located outside the volume enclosed by the partition 18 . Steam from vapor / liquid mixture 34 and fro...

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PUM

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Abstract

A method of controlling stress in a boiler pressure vessel comprises limiting the diameter of a drum (10) of the boiler pressure vessel and preheating at least a portion of the wall (12) of the drum (10). Limiting the diameter of the drum (10) allows pressure in the drum (10) to be increased for a given mechanical stress. Furthermore, preheating the wall (12) of the drum (10) reduces peak thermally induced stresses in a material from which the drum (10) is fabricated.

Description

technical field [0001] The present application generally relates to systems and methods for controlling variables in boiler pressure vessels. In more detail, the present application relates to systems and methods for reducing stress in the walls of boiler pressure vessels. Background technique [0002] Boiler A pressure vessel (hereinafter "boiler") is a closed vessel comprising a shell and containing a liquid which can be heated under controlled conditions with fuel or hot gas. The shell is a drum (hereinafter referred to as "drum" or "boiler drum") defined by one or more walls. The chemical energy contained in the fuel is converted into thermal energy, which heats and vaporizes the liquid in the boiler. A mixture of liquid and vapor enters the cartridge. The walls of the cartridge are designed so as to withstand the pressure exerted by the vaporized liquid. Vaporized liquid is available from the cartridge and used to provide work, or as a heat source. [0003] Startin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B37/22F22B5/04
CPCF01K3/22F22B5/04F22B35/04F22B37/22
Inventor D.W.拜尔利I.J.佩兰F.德鲁瓦C.鲁奇蒂F.吕克G.T.塞尔比W.P.鲍弗二世
Owner GENERAL ELECTRIC TECH GMBH