JP2000018862A - Rotary regeneration type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install an automatic radial sealing unit for holding a gap between a sector plate and a rotor tire at a target set value and a circumferential seal using a solid sliding material together. SOLUTION: The rotary regeneration type heat exchanger comprises an automatic radial sealing unit for automatically controlling a gap between a sector plate 4 and a rotor tire 6. Further, the exchanger comprises a circumferential seal having solid sliding materials 9 (9-1, 9-2) and retainers 10 (10-1, 10-2) The material 9 and the retainer 10 are divided at an end face position of the plate 4. Then, the material 9-2 of the part of the plate 4 and the retainer 10-2 are mounted at the plate 4, and the material 9-1 of the other part and the retainer 10-1 are mounted at a casing 11 so that they can be independently displaced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerative heat exchanger, and more particularly to a regenerative heat exchanger having an improved sealing mechanism.

[0002]

2. Description of the Related Art A rotary regenerative heat exchanger is a heat exchanger used for preheating air with heat held by waste gas of a boiler of a thermal power plant. FIG. 4 shows an example of a conventional rotary regenerative heat exchanger for preheating air with boiler waste gas, which is also called an air preheater.

As shown in FIG. 4, this rotary regenerative heat exchanger has a rotor 2 having a heat storage element called an element denoted by reference numeral 1 therein, which rotates around its axis at a constant speed. And the waste gas pass through the element 1 in opposite directions, as indicated by the arrows in FIG.
Heat exchange between air and waste gas is performed using the element 1 as a medium.

[0004] The rotary regenerative heat exchanger has a rotor 2 rotating in a fixed structure. Due to its structure, a gap is formed between the rotor 2 and the fixed structure surrounding the rotor 2. The gap causes high-pressure air to leak to the low-pressure waste gas side, thereby reducing the efficiency of heat exchange.

For this reason, a seal is attached to each part of the rotary regenerative heat exchanger to minimize the above-mentioned leakage. However, the radial seal 3 in the radial direction on the high temperature side of the rotary regenerative heat exchanger is used. The gap 7 (hereinafter, referred to as gap 7) between the heat exchanger and the fan-shaped plate 4 varies greatly depending on the temperature of the rotary regenerative heat exchanger. That is, when hot (during boiler operation), the rotary regenerative heat exchanger bends due to thermal deformation as shown in FIG. 5, and the gap 7 becomes larger than when cold (at normal temperature).

For this reason, in the conventional rotary regenerative heat exchanger, as shown in FIG. 6, a gap sensor 5 is provided on a sector plate 4 so that a gap 7 between an outer peripheral portion of a rotor 2 and a rotor tire 6 is provided.
And a configuration called an automatic radial seal device in which the fan-shaped plate is made to follow such that the gap 7 on the outer peripheral portion thereof reaches a target set value has been considered.

Further, there is a mechanism for reducing the circumferential seal leakage by using a solid sliding material for the circumferential seal 8 of the heat exchanger, but the mechanism is installed in the heat exchanger provided with the above-mentioned automatic radial seal device. Things have been structurally problematic and have been considered impossible. The reason is as follows.

In the automatic radial seal device, since the sector plate 4 follows the deformation of the rotor 2, the sector plate 4 is absolutely displaced. On the other hand, the solid sliding member 9 of the circumferential seal 8 is also relatively displaced with respect to the deformation of the rotor 2, but the displacement of the retainer 10 holding it is zero because it is attached to the casing 11.

In order to install the circumferential seal 8 at the same time as the automatic radial seal device, a retainer for holding the solid sliding member must be attached to the sector plate 4, and the retainer is displaced. Some cages are displaced depending on the mounting position, and others are not.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a rotary regenerative heat exchanger, comprising: an automatic radial seal device for maintaining a gap between a sector plate and a rotor tire at a target set value; It is an object of the present invention to provide a regenerative heat exchanger that is configured to be installed together with a seal and has a high gas leak reduction effect.

[0011]

According to the present invention, there is provided a rotary regenerative heat exchanger having an automatic radial sealing device for detecting a gap between a rotor tire and a sector plate with a sensor and automatically controlling the gap. The circumferential seal is constituted by a solid sliding member divided at the end face position of the sector plate and its retainer, and the retainer and the solid sliding material of the sector plate portion are attached to the sector plate, The retainer and the solid sliding member are respectively attached to a casing.

As described above, in the rotary regenerative heat exchanger of the present invention, the circumferential seal is divided at the end face position of the sector plate, and the solid sliding material constituting the circumferential seal and the retainer are divided into the sector plate. Since the part and the other part have different structures, the function of the circumferential seal can be performed even if each part is relatively displaced. Therefore, in the rotary regenerative heat exchanger of the present invention, the automatic radial seal device and the circumferential seal can be provided together.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary regenerative heat exchanger according to the present invention will be specifically described below with reference to the embodiments shown in FIGS. FIG. 1 shows a state in which a circumferential seal portion of a rotary regenerative heat exchanger according to an embodiment of the present invention is cold (left side).
And a hot state (right side).

In FIGS. 1 and 2, a solid sliding member constituting a circumferential seal and its retainer are divided at the end face position of the sector plate 4, and the retainer 10-2 in the sector plate 4 is connected to the solid slide member. Slider 9-2 and cage 10 other than fan plate 4
-1 and the solid sliding material 9-1 are displaceable independently of each other.

The retainer 10-2 to which the solid sliding member 9-2 is attached is attached to the sector plate 4, and is configured to be displaceable together with the sector plate 4. On the other hand, solid sliding material 9-1
Is attached to the casing 11.

The fan-shaped plate 4 is automatically followed by the deformation of the rotor 2 by an automatic radial seal device in which the gap between the fan-shaped plate 4 and the radial seal is automatically controlled, so that the rotor outer peripheral side of the fan-shaped plate 4 is absolutely displaced. However, the retainer 10-2 can be displaced together. On the other hand, the retainer 10-1 of the solid sliding member 9-1 attached to the casing 11 that does not displace does not displace.

As described above, according to the circumferential seal of the rotary regenerative heat exchanger shown in FIGS. 1 and 2, the solid sliding member divided at the end face position of the sector plate and the retainer thereof are used. Also, it is possible to cope with the deformation of the rotor. That is,
As shown in the left half of FIG.
1 and 10-2 are at the same level, but as shown in the right half of FIG. 1A, the rotor 2 is lowered at the time of hot operation, and the outer peripheral portion of the sector plate 4 is also lowered in response thereto.

With the above configuration, the retainer 10-2 and the solid sliding member 9-2 at the sector plate 4 are also lowered.
On the other hand, the retainer 10-1 attached to the casing 11 other than the sector plate 4 and the solid sliding material 9-1 held by the retainer remain at the same position.

As described above, the retainer 10-2 fixed to the fan-shaped plate 4 following the thermal deformation of the rotor 2 always has the rotor tire 6 (the sliding surface of the outermost rotor 2 with the solid sliding material). And the relative displacement of the solid sliding member 9-2 and the retainer 10-2 that slide on the rotor tire 6 can be handled with the minimum shape.

On the other hand, since the cage 10-1 other than the fan-shaped plate portion is displaced relative to the rotor tire 6, the shapes of the solid sliding member 9-1 and the cage 10-1 correspond to the displacement. There is a need to. However, it is possible to cope with the above displacement due to the independent mounting method and shape.

Further, the automatic radial sealing device is provided with a system for withdrawing the fan-shaped plate 4 (to increase the relative displacement with respect to the rotor) in the event of any abnormality in which the fan-shaped plate 4 does not follow the deformation of the rotor 2 and safety. Figure 3
, The relative displacement between the rotor 2 and the sector plate 4 increases.

Similarly, since the relative displacement between the cage 10-2 and the rotor tire 6 in the sector plate 4 becomes large, the shape of the solid sliding material and the cage to follow the displacement is required. Since the cage and the solid sliding member are divided and attached independently at the position of the fan-shaped plate 4 and other positions, the displacement can be sufficiently coped with.

As described above, in the rotary regenerative heat exchanger of the present embodiment, in the rotary regenerative heat exchanger in which the automatic radial seal device is installed, the solid sliding material 9 can be used for the circumferential seal 8. Thus, the amount of leakage between heat exchange fluids can be effectively suppressed.

[0024]

As described above, the rotary regenerative heat exchanger of the present invention has a rotary regenerative heat exchanger having an automatic radial seal device for detecting the gap between the radial seal and the sector plate with a sensor and automatically controlling the gap. In the exchanger, the solid sliding member divided at the end face position of the fan-shaped plate and its holder are constituted, and the cage and the solid sliding material of the fan-shaped plate portion are provided on the fan-shaped plate, The retainer and the solid slide have respective circumferential seals attached to the casing.

In the rotary regenerative heat exchanger according to the present invention, as described above, the cage and the solid sliding material constituting the circumferential seal are separated at the fan-shaped plate position and other positions, and are displaced independently of each other. Since it is possible, the circumferential seal can maintain the sealing action even when the fan-shaped plate is displaced by the automatic radial sealing device in response to the thermal deformation of the rotor. Thus, according to the present invention, it is possible to provide a rotary regenerative heat exchanger provided with a sealing device capable of coping with movement such as thermal deformation.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing a state of a circumferential seal portion in a cold state and a hot state in a rotary regenerative heat exchanger according to an embodiment of the present invention, wherein FIG. Sectional view along
(B) is a plan view.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a cross-sectional view showing a state of a circumferential seal portion when an abnormality occurs in the automatic radial seal device in the rotary regeneration type heat exchanger according to the embodiment of the present invention.

FIG. 4 is a perspective view showing the structure of the rotary regenerative heat exchanger, partially cut away.

FIG. 5 is an explanatory diagram in a cold state and a hot state, which shows a state of generation of a gap in the rotary regenerative heat exchanger in a slightly exaggerated manner.

FIG. 6 is an explanatory diagram showing a state of an automatic radial sealing device in the rotary regeneration type heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Element 2 Rotor 3 Radial seal 4 Fan plate 5 Gap sensor 6 Rotor tire 7 Gap 8 Circumferential seal 9-1 Solid sliding material 9-2 Solid sliding material 10-1 Cage 10-2 Cage 11 Casing

Claims (1)

[Claims] In a rotary regenerative heat exchanger having an automatic radial seal device for detecting a gap between a rotor tire and a sector plate by a sensor and automatically controlling the gap, a solid slide divided at an end face position of the sector plate. Material and its retainer,
A rotary seal, wherein the retainer and the solid sliding member of the sector plate portion have a circumferential seal attached to the sector plate, and the other portion of the cage and the solid sliding material have a circumferential seal attached to the casing. Type heat exchanger.