JPH0411794B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary regenerative heat exchanger for gaseous media, comprising: a rotor having a number of fan-shaped chambers for conducting regenerative heat exchange material; a casing and adjustable sector plates for mutually opposite flow of a primary gaseous medium to be heated and a secondary gaseous medium to be cooled, each at a pressure different from that of the primary medium; a stationary structure comprising an end plate having separate inlet and outlet openings and providing two flow paths through the heat exchanger between the inlet and outlet openings; a gaseous medium at least at low pressure; and a device for reducing leakage by trapping it in a high-pressure gaseous medium in a fan-shaped chamber.

Means for eliminating induced leakage through rotor fans are conventionally known in connection with air preheaters. The means comprises piping including a fan and arranged to move air by suction from a suitable location in the air preheater to a fan-shaped chamber, in which the gas is supplied to a fan-shaped chamber, for example The guided gas is guided in order to replace it with air before entering the flow path for air as shown in Patent No. 2,892,616.

This type of means for eliminating induced leakage is very space consuming and cannot be combined in an easy way with existing regenerative heat exchangers.

The aim of the invention is to provide a more favorable solution to the aforementioned problem, so as to allow the improvement of existing heat exchangers of this type in an easy manner.

This object can be achieved by the means of the invention described below. That is, in the rotary regenerative heat exchanger according to the present invention, a primary gaseous medium to be heated and a secondary gaseous medium to be cooled having a pressure different from that of the primary medium flow in opposite directions. , comprising a rotor having a number of fan-shaped chambers for guiding these media,
an adjustable sector plate forming a passage for high pressure medium and low pressure medium through said rotor and an end plate forming respective inlet and outlet openings for high pressure medium and low pressure medium; A leakage of high pressure medium is provided between the end of the rotor and the sector plate in order to displace the low pressure medium by the high pressure medium by pushing out the medium with high pressure medium, and an axis between the end of the rotor and the sector plate is provided. A fan-shaped plate adjustment device is provided to adjust the amount of leakage of the high-pressure medium by changing the center direction distance, and a part of the fan-shaped plate on the outlet opening side of the low-pressure medium that pushes out the low-pressure medium in the small chamber with the high-pressure medium is provided. a low-pressure medium detection device located nearby; the low-pressure medium detection device detects the presence or absence of a low-pressure medium in the chamber in which the low-pressure medium is forced out by the high-pressure medium to control the sector plate adjustment device; It is characterized by its configuration.

A preferred embodiment of the invention comprises a low pressure medium detection device located proximate to the portion of the sector plate in which the outlet opening for the low pressure medium flow and the sector chamber moves towards the high pressure medium flow, the presence or absence of said low pressure medium or characterized by a sector plate adjustment device controlled by the low pressure medium detection device such that the gap increases or decreases when absence is indicated respectively.

Thus, according to the present invention, undesirable leakage can be easily eliminated by controlling the gap between the sector plates, thereby preventing contamination by leaking gas.

Furthermore, space-wasting piping or ducts and fans are not required, making it considerably easier to combine the present invention with existing heat exchangers.

The present invention will now be described with reference to the attached diagrammatic representation of the air preheating rotor of the drawings, which is shown by way of example in FIG. This will be explained in detail with reference to explanatory drawings, and FIG. 2 shows a perspective view of the rotary regenerative heat exchanger.

In the drawing, a rotor 1 is shown, and the rotor 1
is subdivided by partitions 2 into a number of fan-shaped chambers, the rotor having a casing and an inlet opening 5 and an outlet opening 6 for the air flow, as well as an inlet opening 7 and an outlet opening for the gas flow. 8
It is rotatably supported by a stationary structure consisting of two end plates 4 having . The rotor chamber is assumed to move from left to right as indicated by arrow 3 in FIG.

The openings 6, 7 and 5, 8 of each end plate 4 are separated by sector plates 9, 10, respectively, which sectors 9, 10 are adjusted to the appropriate spacing with respect to the end of the rotor by means of an adjusting device. 13, 14. The gap 13 prevents air leakage (arrow 15 ) is made as small as possible to reduce the air flow, and the pressure of the air flow is higher than the pressure of the gas flow so that the gas does not contaminate the air. On the other hand, the gap 14 is quite large, and the gap 14 is adjusted so that an intentional leakage (arrow 16) is maintained, and the intentional leakage occurs when the fan-shaped chamber 17 is between the fan-shaped plates 9 and 10. After passing through, the gas is gradually forced out of the fan-shaped chamber 17 before opening to the air flow path between the openings 5-6. The volume transferred from the gas flow path to the air flow path therefore consists mostly of pure air.

By knowing the heat exchanger and prevailing pressure differential data, it is easy to calculate the required distance 14. However, a more accurate method is to detect the pressure of the low-pressure medium, e.g. combustion gas, close to the outlet opening of the low-pressure medium and the part of the sector plate 10 in which the sector chamber moves towards the flow of the high-pressure medium between the openings 5, 6. The first step is to install a low-pressure medium detection device 20 for this purpose. The detection device 20 is connected to a control device 21, known per se, of the regulating device 11 for adjusting the pressure gap 14, and another part of the control circuit 22 of the control device 21 ensures that the detection device 20 detects the presence of a low-pressure medium. It is designed to increase the gap 14 when the low pressure medium is indicated, and to decrease the gap 14 when the low pressure medium is not indicated.

In order to provide a clean high-pressure medium, e.g. air, without contamination with low-pressure medium, e.g. The vertical movement is adjusted by .

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 shows the outer circumferential surface of the rotor, together with the flat plate and the device for adjusting the fan-shaped plate, in an expanded form on the paper surface of the drawing. A diagrammatic illustration of the preheating rotor, FIG. 2 is a perspective view of the rotary regenerative heat exchanger. 1... Rotor, 2... Partition wall, 4... End plate, 5...
...Air inlet opening, 6... Air outlet opening, 7...
...Gas inlet opening, 8...Gas outlet opening, 9...
... Fan-shaped plate, 10... Fan-shaped plate, 11... Fan-shaped plate adjustment device, 13... Between, 14... Between, 17... Fan-shaped chamber, 20... Low pressure medium pressure detection device, 21...
...Control device, 22...Control circuit.

Claims (1)

[Claims] 1. A primary gaseous medium to be heated and a secondary gaseous medium to be cooled having a pressure different from that of the primary medium flow in mutually opposite directions and have a number of fan-shaped chambers 17 for guiding these media. comprising a rotor 1 and adjustable sector plates 9, 10 forming passages for high-pressure and low-pressure media through the rotor 1 and respective inlet openings 5 for high-pressure and low-pressure media;
7 and an end plate 4 forming an outlet opening 6, 8;
In order to push out the low-pressure medium in the small chamber 17 with the high-pressure medium and replace the low-pressure medium with the high-pressure medium, leakage of the high-pressure medium is caused between the end of the rotor 1 and the fan-shaped plate 9. A fan-shaped plate adjustment device 11 is provided to adjust the amount of leakage of the high-pressure medium by changing the axial distance 14 between the chamber and the sector-shaped plate 9, and the low-pressure medium in the small chamber 17 is pushed out by the high-pressure medium. the sector plate 10 on the side of the outlet opening 8 of the low pressure medium;
A low pressure medium detection device 2 located near the part of
0, and the fan-shaped plate adjusting device 11 is controlled by detecting the presence or absence of the low-pressure medium in the small chamber 17, where the low-pressure medium is pushed out by the high-pressure medium, by the low-pressure medium detection device 20. Rotary regenerative heat exchanger.