JP3608093B2 - Rotating regenerative heat exchanger with water cleaning device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water washing cleaning device capable of removing dust or the like in exhaust gas adhering to a heat transfer surface of a rotary regenerative heat exchanger used in a power plant or the like during operation without stopping the plant or the like. The present invention relates to a rotary regenerative heat exchanger with a heater.
[0002]
[Prior art]
When exhaust gas passes through the fluid passage of the heat transfer body of the regenerative heat exchanger, dust in the exhaust gas adheres to the heat transfer surface, so this dust is usually removed by soot blow. When the adhesive force is strong, the purpose cannot be achieved by this operation alone.
[0003]
In this case, it is necessary to wash with water. However, when washing with low water pressure, a large amount of water injection is required, so washing with water during operation of the heat exchanger may cause a thermal shock to the members of the heat exchanger. There is. Therefore, the exhaust gas passing through the heat exchanger must be bypassed or the plant is temporarily stopped, so that the heat exchanger must be separated from the operating system of the temporary plant and washed with water.
[0004]
Therefore, a method and an apparatus for washing and cleaning the heat exchanger in a state where exhaust gas is passed through without injecting the plant by injecting a small amount of high-pressure water and steam or air have been developed. (See JP-A-61-289296, 289297) These washing-cleaning devices that can be cleaned during the conventional operation are supplied from the washing-nozzle header 2 and sprayed from a nozzle (not shown) as shown in FIG. The high-pressure water thus made has a structure that directly touches the diaphragm 1, the stay plate 3, and other members.
[0005]
[Problems to be solved by the invention]
In the conventional apparatus described above, a cleaning method using a small amount of high-pressure water is performed in order to reduce thermal shock due to water washing during operation, but damage to the heat exchanger member due to thermal shock occurs. The cause of the thermal shock due to the water washing during operation is due to the temperature difference between the low temperature washing water and the high temperature heat exchanger member, and due to structural restrictions on the arrangement of the water washing nozzles, for example, the stay plate 3 and the basket support 8 Another cause is that a member having a large temperature drop rate and a member having a low temperature drop rate such as the diaphragm 1 are mixed.
[0006]
It is an object of the present invention to provide a rotary regenerative heat exchanger with a water cleaning device that can be cleaned during operation, equipped with various means for reducing damage to heat exchanger members due to thermal shock.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, a rotary regenerative heat exchanger with a water washing cleaning device according to the present invention includes a plurality of diaphragms arranged radially in a rotor rotating around a rotor post, and a circumference in the rotor. A stay plate arranged in a direction, and a heat transfer member that is accommodated in a space defined by the diaphragm and the stay plate and allows exhaust gas to pass through. A high pressure is applied from one end face of the rotor toward the heat transfer member. In a rotary regenerative heat exchanger having a flush cleaning device that moves a nozzle for spraying flush water in a radial direction, a protector plate is installed along the flush water jet side edge of the diaphragm, and the stay plate is washed with water. A cover plate is installed along the edge of the water ejection side . In addition, a plurality of diaphragms arranged in a radial direction in a rotor rotating around a rotor post, a stay plate arranged in a circumferential direction in the rotor, and a space defined by the diaphragm and the stay plate Rotational regeneration comprising a water washing cleaning device that is housed in a heat transfer body that allows exhaust gas to pass through, and that moves a nozzle that injects high-pressure water washing water from one end face of the rotor toward the heat transfer body in a radial direction. In the heat exchanger, a protector plate is installed along the edge of the diaphragm on the washing water injection side, and the nozzle is passed through the nozzle so as to reflect and disperse the washing water injected from the nozzle. The deflector plate is installed at the passing position of the stay plate . Furthermore, a plurality of diaphragms arranged radially in the rotor rotating around the rotor post, a stay plate arranged in the circumferential direction in the rotor, and a space defined by the diaphragm and the stay plate Rotational regeneration comprising a water washing cleaning device that is housed in a heat transfer body that allows exhaust gas to pass through, and that moves a nozzle that injects high-pressure water washing water from one end face of the rotor toward the heat transfer body in a radial direction. The type heat exchanger is characterized in that a cutout is provided at an end edge of the stay plate. Still further, a plurality of diaphragms arranged radially in the rotor rotating around the rotor post, a stay plate arranged in the circumferential direction in the rotor, and the diaphragm and the stay plate are defined by the diaphragm and the stay plate. Rotation equipped with a water washing cleaning device that consists of a heat transfer body that is accommodated in the space and allows exhaust gas to pass through, and that moves a nozzle that injects high-pressure water washing water from one end face of the rotor toward the heat transfer body in the radial direction. In the regenerative heat exchanger, the stay plate is divided into a high temperature side stay plate and a low temperature side stay plate. Furthermore, a plurality of diaphragms arranged in the radial direction in the rotor rotating around the rotor post, a stay plate arranged in the circumferential direction in the rotor, and the diaphragm and the stay plate are defined by the diaphragm and the stay plate. Rotation equipped with a water washing cleaning device that consists of a heat transfer body that is accommodated in the space and allows exhaust gas to pass through, and that moves a nozzle that injects high-pressure water washing water from one end face of the rotor toward the heat transfer body in the radial direction. in regenerative heat exchangers, provided with a notch on either side of the basket support side of the stay plates, the basket support is characterized by being configured so as not to directly joined to the diaphragm.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a plurality of diaphragms 1 arranged radially in a rotor rotating around a rotor post 10, a stay plate 3 arranged circumferentially in the rotor, and these diaphragms 1 and stays. A flush nozzle header that is comprised of a heat transfer body (not shown) that is accommodated in a space defined by the plate 3 and allows exhaust gas to pass through, and that injects high-pressure flush water from one end face of the rotor toward the heat transfer body. 2 shows a rotary regenerative heat exchanger equipped with a water cleaning device that moves two nozzles (not shown) in a radial direction . 9 is a soot blower nozzle header. For the purpose of protecting the diaphragm 1, a protector plate 5 is provided along the edge of the diaphragm 1 on the washing water ejection side to prevent the washing water from coming into direct contact with the diaphragm 1 . In addition , for the purpose of protecting the stay plate 3, a cover plate 4 is installed along the edge of the wash plate 3 on the washing water jet side to prevent the flush water from coming into direct contact with the stay plate 3. It is .
[0009]
The cross-sectional structures of the cover plate 4 and the protector plate 5 are as shown in FIG. In FIG. 2, the cover plate 4 is joined to the basket shell 12 or a holding bar (not shown). The protector plate 5 is joined to the diaphragm 1.
[0010]
The cover plate 4 is provided with a stopper 13 for preventing the washing water from flowing into the diaphragm 1. Further, the width of the cover plate 4 in the circumferential direction of the heat exchanger is appropriately determined depending on the size of the heat exchanger in order to prevent flush water from flowing into the stay plate 3 from the gap of the basket shell 12.
[0011]
A flushing water sprayed from a nozzle (not shown) of the flushing nozzle header 2 by installing a deflector plate 6 at the passing position of the flushing nozzle header 2 and at the passing position of the stay plate 3. Is reflected and dispersed to prevent the washing water from coming into direct contact with the stay plate 3 . The deflector plate 6 is installed together with the cover plate 4 or in place of the cover plate 4.
[0012]
Further, as shown in FIG. 1, the stay plate 3 is provided with a notch 8a on the basket support 8 side, and a structure that prevents permanent distortion by relaxing thermal stress due to a difference in temperature drop rate between members. It is said. Further, as shown in FIG. 3, a cutout 8 a ′ may be provided in another part (for example, the upper part) of the stay plate 3.
[0013]
As a structure for preventing this distortion, as shown in FIG. 4, the stay plate 3 is divided into a high temperature side stay plate 3a and a low temperature side stay plate 3b, and as shown in FIG. Alternatively, the cutout 3c may be provided to join the stay plate 3 directly without being joined directly to the stay plate 3.
[0014]
On the other hand, in the low temperature side part of the heat exchanger, the same means as that of the high temperature side part can be taken, but the protection plate 5 and the deflector plate 6 can be sufficiently protected.
[0015]
In addition, as shown in FIG. 1, it is also possible to use a means for cleaning the heat exchanger by injecting steam or air supplied from the soot blower nozzle header 9 at the high temperature side portion.
[0016]
Similarly, other cleaning means can be used at the low temperature side.
[0017]
【The invention's effect】
1) By protecting the diaphragm 1 with the protector plate 5 and the stay plate 3 with the cover plate 4 or the deflector plate 6, direct contact with flush water is avoided to prevent a sudden drop in temperature and damage due to thermal stress is prevented.
2) By changing the structure of the stay plate 3 and the basket support 8, the thermal stress due to the difference in temperature drop rate between the members is relieved to prevent permanent distortion.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a high temperature side portion of a rotary regenerative air preheater equipped with a water washing cleaning device of the present invention.
FIG. 2 is a cross-sectional structural view of the E-I in FIG. 1;
FIG. 3 is a diagram illustrating a structure of a stay plate.
FIG. 4 is a diagram illustrating a structure of a stay plate.
FIG. 5 is a diagram illustrating a structure of a stay plate.
FIG. 6 is a perspective view of a high temperature side portion of a rotary regenerative air preheater equipped with a conventional water washing apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Diaphragm 2 Flushing nozzle header 3 Stay plate 3a High temperature side stay plate 3b Low temperature side stay plate 3c Notch 4 Cover plate 5 Protector plate 6 Deflector plate 7 Radial seal 8 Basket support 8a Notch 8a 'Notch 9 Soot blower nozzle header 10 Rotor Post 11 Rotor seal 12 Basket shell 13 Stopper

Claims (5)

A plurality of diaphragms arranged radially in a rotor rotating around the rotor post, a stay plate arranged circumferentially in the rotor, and a space defined by the diaphragm and the stay plate Rotating regenerative heat comprising a heat transfer device that is housed and is made of a heat transfer material that allows exhaust gas to pass through, and that moves a nozzle that injects high-pressure wash water from one end face of the rotor toward the heat transfer member in a radial direction. in exchangers, as well as installing a protector plate along the washing water jetting side edge of the diaphragm, with rinsing cleaning apparatus characterized by installing the cover plate along a washing water jetting side edges of the stay plate Rotating regenerative heat exchanger. A plurality of diaphragms arranged radially in a rotor rotating around the rotor post, a stay plate arranged circumferentially in the rotor, and a space defined by the diaphragm and the stay plate Rotating regenerative heat comprising a heat transfer device that is housed and is made of a heat transfer material that allows exhaust gas to pass through, and that moves a nozzle that injects high-pressure wash water from one end face of the rotor toward the heat transfer member in a radial direction. in exchangers, as well as installing a protector plate along the washing water jetting side edge of the diaphragm, as to reflect dispersed washing water sprayed from the nozzle, a passage position of the nozzle, moreover, Stay Rotating regenerative type with water cleaning device, characterized by a deflector plate installed at the plate passing position Exchanger. A plurality of diaphragms arranged radially in a rotor rotating around the rotor post, a stay plate arranged circumferentially in the rotor, and a space defined by the diaphragm and the stay plate Rotating regenerative heat comprising a heat transfer device that is contained in a heat transfer material that allows exhaust gas to pass through, and has a nozzle that injects high-pressure wash water from one end face of the rotor toward the heat transfer material in a radial direction. in exchanger, rinsing the cleaning device with rotary type regenerative heat exchanger, characterized in that a notch at the edge of the stay plate. A plurality of diaphragms arranged radially in a rotor rotating around the rotor post, a stay plate arranged circumferentially in the rotor, and a space defined by the diaphragm and the stay plate Rotating regenerative heat comprising a heat transfer device that is contained in a heat transfer material that allows exhaust gas to pass through, and has a nozzle that injects high-pressure wash water from one end face of the rotor toward the heat transfer material in a radial direction. in exchanger, rotary regenerative heat exchanger with rinsing cleaning apparatus characterized by dividing the above stay plates to the high temperature side stay plates and cold side stay plates. A plurality of diaphragms arranged radially in a rotor rotating around the rotor post, a stay plate arranged circumferentially in the rotor, and a space defined by the diaphragm and the stay plate Rotating regenerative heat comprising a heat transfer device that is housed and is made of a heat transfer material that allows exhaust gas to pass through, and that moves a nozzle that injects high-pressure wash water from one end face of the rotor toward the heat transfer member in a radial direction. in exchanger, provided with a notch on either side of the basket support side of the stay plates, washing the cleaning device with rotary type regenerative heat exchanger in which the basket support is characterized by being configured so as not to directly joined to the diaphragm.

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