Heat exchange – Regenerator – Movable heat storage mass with enclosure
Patent
1999-04-27
2000-09-19
Atkinson, Christopher
Heat exchange
Regenerator
Movable heat storage mass with enclosure
165 111, F23L 1502
Patent
active
061197645
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention pertains to an arrangement in regenerative rotary heat exchangers, particularly air preheaters, for detecting and controlling clearance between a flange that projects radially outwards around the end surfaces of the rotor and axially in relation to movable sector plates of the rotor that mutually separate the two heat exchanging media.
Arrangements of this kind have been the subject of comprehensive development over a long period of time. The problem to be solved is that clearance detecting or sensing devices in particular are often exposed to troublesome ambient conditions, namely a corrosive and dirty atmosphere with considerable variations in pressure and temperature as the rotor rotates. This is because as the rotor sectors pass in towards and out from the edges of the sector plates the heat exchanging media will flow alternately around the sensors active between the sector plates and rotor flanges at alternately high and low pressures and exert a disturbing influence thereon. Despite efforts to compensate for disturbances, the effect of the ambient conditions renders sensing unreliable. As a result, developments have leaned towards more sophisticated solutions, such as slip shoes that include forward feed arrangements for compensating wear, and air cushion arrangements.
OBJECTS OF THE INVENTION
The object of the present invention is to provide a simple and reliable sensor or detector arrangement on which ambient conditions will have substantially no effect.
This object is achieved with an arrangement that has the characteristic features set forth in the accompanying independent claim. Preferred embodiments are defined in the accompanying dependent claims.
As a result of placing the detectors or sensors connected with the sector plates outside the regions of said plates, i.e. in the passageways for respective heat exchange media, the ambient conditions to which the sensors are subjected will be stable in normal operation. As will be apparent from the dependent claim, simple, operationally reliable sensors or detectors based on through-flushing with cooling and cleansing compressed air can be used without subjecting the sensors to worse disturbances than those that can be compensated for in an appropriate manner.
BRIEF DESCRIPTION OF THE DRAWINGS
So that the invention will be understood more readily and its features made more apparent, the invention will now be described in more detail with reference to an exemplifying embodiment of an inventive sensing arrangement and with reference to the accompanying schematic drawings, in which
FIG. 1 illustrates an air preheater from above; and
FIG. 2 illustrates sensing and controlling of clearance between a rotor flange and a sector plate, in side view.
DETAILED DESCRIPTION
FIG. 1 illustrates a typical rotary, regenerative air preheater intended for preheating combustion air with the aid of exhaust gases. The preheater includes a stationary housing 1 in which there is mounted a rotatable rotor which has a regeneratable mass and which is rotated at a speed of about one (1) r.p.m. Two sector plates 3, 4 are mounted for axial movement relative to the rotor and disposed close to the end surface of the rotor, both above and beneath said rotor. The sector plates 3, 4 separate a gas side 5 from an air side 6, wherewith although gas and air are able to enter beneath the edges of respective sector plates due to rotation of the rotor, there need be no direct leakage from one side to the other provided that the clearance between the sector plates 3, 4 and the ends of the rotor can be kept low in spite of the fact that the rotor ends are never completely flat but are liable to deviate markedly from a flat state as a result of thermal deformation.
The outer ends of the sector plates are each guided by two sensors 7. The sensors coact with a flange 8 that extends circumferentially around the rotor, at the top and bottom thereof respectively, as shown in FIG. 2 for the upper part of the air preheater, seen in the direc
REFERENCES:
patent: 3232335 (1966-02-01), Kalbfleisch
patent: 3250316 (1966-05-01), Nyberg
patent: 3968569 (1976-07-01), Faris
patent: 4000774 (1977-01-01), Puritz et al.
patent: 4219069 (1980-08-01), Stockman
patent: 4301858 (1981-11-01), Mock
patent: 4610297 (1986-09-01), Gibson et al.
Karlsson Kurt
Lundin Stig
ABB Air Preheater Inc.
Atkinson Christopher
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