JPH1183362A - Rotary regenerative heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a rotary regenerative heat exchanger for improving leakage preventive performance. SOLUTION: In the rotary regenerative type heat exchanger for minimizing leakage of the air between the air side and a gas side by reducing a gap between a sector plate arranged between a gas side passage and an air side passage and a radial plate 3 mounted at a loader 2 by detecting the gap by sensors and displacing the plate based on the detected value by sealing gap setters, the plate is radially divided into a plurality of sector plates 4a, 4b, and the sensors 5a, 5b, and sealing gap setters 8a, 8b are provided at the respective plates 4a, 4b.

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 having improved leakage prevention performance.

[0002]

2. Description of the Related Art A rotary regenerative heat exchanger is a device (also referred to as an "air preheater") for preheating with the heat of waste gas of a boiler of a thermal power plant, and FIG. Show. In the rotary regenerative heat exchanger, as shown in FIG. 3, a rotor 2 having a heat storage element called an element 1 therein is rotating around its axis at a constant speed. Air and waste gas flow in opposite directions to each other as shown by arrows in FIG.
In this process, heat exchange between the air and the waste gas is performed using the element 1 as a medium.

[0003] In the rotary regenerative heat exchanger, a gap is formed between the rotor 2 and a fixed structure surrounding the rotor 2 due to its structure. The gap causes high pressure air to flow to the low pressure waste gas side. Leakage reduces the efficiency of heat exchange.

For this reason, seals are attached to the respective seals of the rotary regenerative heat exchanger so that the above-mentioned leakage is minimized. The gap 7 between the radial radial seal 3 on the high-temperature side of the rotary regenerative heat exchanger 3 and the sector plate 4 varies greatly depending on the temperature of the rotary regenerative heat exchanger.
As described above, the gap 7 is curved during hot operation (during boiler operation) than during cold operation (during normal temperature) due to thermal deformation.

In the conventional apparatus, as shown in FIG. 5, one sector plate 4 is formed in a radial direction. One gap sensor 5 is provided at the outermost position. Rotor 2
Rotor tire (target of gap sensor) 6
The gap sensor 5 is detected by the gap sensor 5 and the sector plate 4 is adjusted and controlled so that the gap 7 on the outer peripheral portion thereof becomes a target set value.

[0006]

In the conventional apparatus described above, when the rotor diameter is large or the thermal deformation is large, there is a limit to keeping the gap between the rigid rigid sector plate and the rigid rigid rotor and the radial seal constant. there were.

[0007] It is an object of the present invention to provide a rotary regenerative heat exchanger having a high leakage reducing effect.

[0008]

The present invention employs the following means to solve the above-mentioned problems.

That is, a gap between a sector plate disposed between the gas side passage and the air side passage and a radial seal mounted on the rotor is detected by a sensor, and based on the detected value, a seal gap setting device sets the gap. In a rotary regenerative heat exchanger in which the gap is reduced by displacing the sector plate to minimize air leakage between the air side and the gas side, the sector plate is divided into a plurality in the radial direction. In addition, a sensor and a seal gap setting device were provided on each sector plate.

In the above, the gap is detected by each sensor and sent to each seal gap setting device. Then, each sector plate is easily deformed by the seal gap setting device so that the gap becomes the set target value, and the gap is adjusted.

In this way, the gap between the sector plates is adjusted to the set target value, respectively, so that the effect of reducing leakage is greatly improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

The parts described in the prior art will be assigned the same reference numerals and their explanation will be omitted, and the parts related to the present invention will be mainly described. In FIG. 1, the sector plate is
For example, the gap sensor 5b is divided into two, and the gap sensor 5b is provided at the tip of the inner sector plate 4b as in the related art. Further, a rotor tire 6b is provided on the opposed portion of the rotor 2 as in the related art.
A seal gap setting device 8b is provided on the sector plate 4b, and receives an output of the gap sensor 5b.

The outer sector plate 4a is connected to the tip of the inner sector plate 4b so as to be deformable 8 toward the rotor 2. The outer gap sensor 5a and the rotor tire 6a are the same as the conventional one. Also the sector plate 4a
Is provided with a seal gap setting device 8a as in the prior art, and receives the output of the gap sensor 5a.

In the above, the gaps 7a and 7b are detected by the respective sensors 5a and 5b and sent to the respective seal gap setting units 8a and 8b. Then, the sector plates 4a and 4b are easily deformed by the seal gap setting device so that the gaps 7a and 7b become the set target values, and the gaps are adjusted (see FIG. 2).

In this manner, the gap between the sector plates is adjusted to the set target value, respectively, so that the effect of reducing leakage is greatly improved.

[0017]

As described above, according to the present invention, the sector plate is divided into a plurality in the radial direction, and the respective gaps are adjusted. Thereby, the gap can be stably maintained at the set target value, so that the amount of leakage between heat exchange fluids can be minimized.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of one embodiment of the present invention.

FIG. 2 is an operation explanatory view of the above-described embodiment.

FIG. 3 is a perspective view showing the entire structure of a conventional example, partially cut away.

FIG. 4 is an operation explanatory view of the conventional example.

FIG. 5 is an operation explanatory view of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Element 2 Rotor 3 Radial seal 4, 4a, 4b Sector plate 5, 5a, 5b Gap sensor 6, 6a, 6b Rotor tire 7, 7a, 7b Gap 8, 8a, 8b Seal gap setting device

Claims (1)

[Claims] 1. A gap between a sector plate disposed between a gas side passage and an air side passage and a radial seal mounted on a rotor is detected by a sensor. In a rotary regenerative heat exchanger in which the gap is reduced by displacing the sector plate to minimize air leakage between the air side and the gas side, the sector plate is divided into a plurality in the radial direction. And a sensor and a seal gap setting device are provided for each sector plate.