JP2002295985A - Fire extinguisher for regenerative air preheater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire extinguisher capable of effectively scattering fire extinguishing liquid to a fire generating position even when a heat exchanging rotary element cannot rotate due to the fire upon generation of the fire of the heat exchanging rotary element of a regenerative air pre-heater. SOLUTION: On the upper surface of the heat exchanging rotary element 7, a substantially rod type movable fire extinguishing nozzles 11 formed by arranging a plurality of fire extinguishing liquid scattering openings 12 is disposed. The fire extinguishing nozzle 11 can rotate about the same rotation axis as that of the heat exchanging rotary element 7 on the upper surface of the heat exchanging rotary element 7 by a motor 13, gears 15 and 16 and a manually rotating handle 14. The fire extinguishing nozzle 11 is moved to the fire generating position to scatter the fire extinguishing liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fire extinguishing system for a regenerative air preheater.

[0002]

2. Description of the Related Art FIG. 6A is a plan view showing a conventional fire extinguishing system for a regenerative air preheater, and FIG. 6B is a sectional view taken along a line AA in FIG.

[0003] 1 is a regenerative air preheater, 2 is a gas duct,
3 is an air duct, 4 is a seal plate, 5 is a combustion gas,
Reference numeral 6 denotes air, 7 denotes a heat exchange rotary element, 8 denotes a motor for rotating the heat exchange rotary element 7, 9 denotes a fire extinguishing nozzle, and 10 denotes a fire extinguishing liquid.

A regenerative air preheater 1 provided in a boiler facility includes a gas duct 2 through which high-temperature combustion gas 5 flows and an air duct 3 through which low-temperature air 6 flows, and a seal plate 4.
It is divided by. Then, a disk-shaped heat exchange rotary element 7 constituted by laminating thin metal plates is
Thus, the heat of the combustion gas 5 is transmitted to the air 6 while rotating.

[0005] The heat exchange rotary element 7 is provided with a fire extinguishing system using a fire extinguishing liquid 10 and a fire extinguishing nozzle 9 because a fire may be caused due to accumulation of unburned components in the combustion gas 5.

[0006] The fire extinguishing equipment of the conventional regenerative air preheater 1 is as follows.
As shown in FIG. 6, a fixed fire extinguishing nozzle 9 is installed at one location on the upper surface of the heat exchange rotary element 7 on the gas duct (ie, flue) 2 side of the regenerative air preheater 1. The structure was such that the fire extinguishing liquid 10 was sprayed from the surface.

[0007]

In the conventional fire extinguishing system of the regenerative air preheater 1 shown in FIG. 6, since the fire extinguishing nozzle 9 is fixedly installed, a fire occurs in the heat exchange rotary element 7. Since the fire occurrence position could not be specified in advance, and the fire occurrence position did not always coincide with the installation position of the fire extinguishing nozzle 9, the fire extinguishing liquid 10 could not be effectively sprayed to the fire occurrence position.

That is, conventionally, when a fire occurs in the heat exchange rotary element 7, the heat exchange rotary element 7 is rotated by the motor 8 so that the fire occurrence position of the heat exchange rotary element 7 is fixed. This is considered to be moved below the fire extinguishing nozzle 9. However, in practice, power is not supplied to the drive motor 8 of the heat exchange rotary element 7 due to a fire, or the motor 8 and its wiring are damaged, so that the heat exchange rotary element 7 cannot rotate, and Often the fire extinguishing liquid 10 did not arrive.

If the fire is not properly extinguished in the early stage of the fire, the fire spreads, the damage increases, and it becomes enormous. Therefore, the initial extinguishing is extremely important.

[0010] An object of the present invention is to provide a heat exchange rotary element which can be rotated at any fire position regardless of the location of the heat exchange rotary element. An object of the present invention is to provide a fire extinguishing system for a regenerative air preheater that can effectively spray a fire extinguishing liquid at a fire occurrence position, enable quick initial fire extinguishing, and prevent an increase in loss due to a fire.

[0011]

In order to solve the above-mentioned problems, a fire extinguishing system for a regenerative air preheater according to the present invention comprises a movable fire extinguishing nozzle disposed on an upper surface of a heat exchange rotary element.
The fire extinguishing nozzle is moved to a fire occurrence position to spray a fire extinguishing liquid.

In the fire extinguishing system for a regenerative air preheater according to the present invention, a fire extinguishing nozzle having a substantially rod-like shape formed by arranging a plurality of fire extinguishing liquid spraying openings is disposed on the upper surface of the heat exchange rotary element. The nozzle is rotatable on the upper surface of the heat exchange rotary element about the same rotation axis as the heat exchange rotary element, and moves the fire extinguishing nozzle to a fire occurrence position to spray the fire extinguishing liquid.

In the fire extinguishing system for a regenerative air preheater according to the present invention, a substantially rod-shaped fire extinguishing nozzle formed by arranging a plurality of openings for spraying a fire extinguishing liquid is disposed on an upper surface of a heat exchange rotary element. The nozzle is movable in parallel on the upper surface of the heat exchange rotary element, and the fire extinguishing nozzle is moved to a fire occurrence position to spray a fire extinguishing liquid.

The fire extinguishing equipment for a regenerative air preheater according to the present invention comprises a plurality of substantially rod-shaped fire extinguishing nozzles formed by arranging a plurality of fire extinguishing liquid spraying openings on an upper surface of a heat exchange rotary element. The fire-extinguishing nozzle has a fire-extinguishing liquid stop valve, and the fire-extinguishing liquid is sprayed by opening the stop valve of the fire-extinguishing nozzle located above the fire occurrence position.

Further, the fire extinguishing equipment of the regenerative air preheater of the present invention has a fire occurrence position detecting device, a movable fire extinguishing nozzle arranged on the upper surface of the heat exchange rotary element, and a control device. According to the detection of the fire occurrence position by the detection device, the control device moves the fire extinguishing nozzle above the fire occurrence position and sprays the fire extinguishing liquid.

Further, the fire extinguishing system of the regenerative air preheater of the present invention comprises a device for detecting a fire occurrence position, a plurality of fire extinguishing nozzles arranged on the upper surface of the heat exchange rotary element, a stop valve for the fire extinguishing nozzle, and a control system. The control device opens the stop valve of the fire extinguishing nozzle on the fire occurrence position by detecting the fire occurrence position by the detection device, and moves to the fire occurrence position by the fire extinguishing nozzle with the stop valve opened. Spray fire extinguisher.

As described above, in the present invention, when the fire extinguishing nozzle is movable, the fire extinguishing liquid can be selectively sprayed to the fire occurrence position by moving the fire extinguishing nozzle. Also,
When a plurality of fire-extinguishing nozzles with a stop valve are provided, the fire-extinguishing liquid is selectively sprayed to the fire-occurring position by opening the stop valve of the fire-extinguishing nozzle on the fire-occurring position among the plurality of fire-extinguishing nozzles. be able to.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings described below, those having the same functions are denoted by the same reference numerals, and the repeated description thereof will be omitted.

Embodiment 1 FIG. 1 (a) is a plan view showing a fire extinguishing system of a regenerative air preheater according to Embodiment 1 of the present invention, and FIG. 1 (b) is a sectional view taken along the line AA in FIG. 1 (a). (C) is an enlarged detailed view of a main part (nozzle driving unit) of (b).

1 is a regenerative air preheater, 2 is a gas duct,
3 is an air duct, 4 is a seal plate, 5 is a combustion gas,
6 is air, 7 is a heat exchange rotary element, 8 is a motor for rotating the heat exchange rotary element 7, 11 is a rotary fire extinguishing nozzle, 12 is an opening for spraying a fire extinguishing liquid, 10 is a fire extinguishing liquid, and 13 is a rotating fire extinguishing liquid. A motor mounted around the rotation axis of the heat exchange rotary element 7 for rotating the movable fire extinguishing nozzle 11, 14 is a manual rotary handle, 15 is a gear mounted on the motor 13, 16 is engaged with the gear 15, and is rotatable. The gear 17 mounted on the fire extinguishing nozzle 11 is a bearing.

In the first embodiment, a substantially rod-shaped movable fire extinguishing nozzle 11 formed by arranging a plurality of openings 12 for spraying a fire extinguishing liquid is arranged on the upper surface of the heat exchange rotary element 7. The upper surface of the heat exchange rotary element 7 can be rotated about the same rotation axis as the heat exchange rotary element 7 by the motor 13, the gears 15, 16 and the manual rotary handle 14, and the fire extinguishing nozzle 11 is moved to the fire occurrence position. Spray fire extinguishing liquid.

The fire extinguishing nozzle 11 operates in a fan shape on the heat exchange rotating element 7 and can move all over the upper surface of the heat exchange rotating element 7. Can be reached.

That is, when a fire occurs in the heat exchange rotary element 7, when the motor 13 is driven, or when the motor 13 cannot be driven, the movable fire extinguishing nozzle 11 is moved by the manual rotary handle 14 in FIG. (A) Rotate in the direction of the arrow to spray the fire extinguishing liquid at the fire occurrence position.

As described above, when a fire occurs in the heat exchange rotary element 7, no matter where the fire occurs, even if the heat exchange rotary element 7 cannot rotate due to the fire, The fire-extinguishing liquid 10 can be effectively sprayed to the fire occurrence position, enabling quick initial fire-extinguishing and preventing an increase in loss due to fire. Second Embodiment FIG. 2A shows a second embodiment of the present invention. FIG. 2 is a plan view showing the fire extinguishing equipment of the regenerative air preheater, and FIG. 2B is a cross-sectional view taken along line AA of FIG.

Reference numeral 18 denotes a parallel fire extinguishing nozzle, 19 denotes a worm gear for moving the parallel moving fire extinguishing nozzle 18 in parallel, 20 denotes a motor for rotating the worm gear and move the parallel moving fire extinguishing nozzle 18 in parallel, and 21 denotes a motor. It is a manual rotation handle.

In the second embodiment, a substantially rod-shaped fire extinguishing nozzle 18 formed by arranging a plurality of fire extinguishing liquid spraying openings 12 is disposed on the upper surface of the heat exchange rotary element 7. The fire extinguishing nozzle 18 is a worm gear 19. The motor 20 or the manual rotary handle 21 can be moved in parallel on the upper surface of the heat exchange rotary element 7, and the fire extinguishing nozzle 18 is moved to a position where a fire occurs to spray a fire extinguishing liquid.

Third Embodiment FIG. 3 is a plan view showing a fire extinguishing system for a regenerative air preheater according to a third embodiment of the present invention (a sectional view is omitted).

Reference numeral 22 denotes a fixed radial fire extinguishing nozzle.

In the third embodiment, a plurality of substantially rod-shaped fire-extinguishing nozzles 23 formed by arranging a plurality of fire-extinguishing liquid spraying openings 12 on the upper surface of the heat exchange rotary element 7 are arranged. A fire extinguishing liquid stop valve (not shown) is provided, and the fire extinguishing liquid is sprayed by opening the stop valve of the fire extinguishing nozzle 23 located above the fire occurrence position.

In other words, by opening the stop valve of the fire extinguishing nozzle 23 on the fire occurrence position of the plurality of fire extinguishing nozzles 23, the fire extinguishing liquid can be selectively sprayed on the fire occurrence position.

The fixed fire extinguishing nozzles provided in large numbers are:
Obviously, the shape need not be radial as in the third embodiment. For example, a large number may be provided in parallel in the vertical and horizontal directions.

Embodiment 4 FIG. 4A is a block diagram showing a configuration of a fire extinguishing system for a regenerative air preheater according to Embodiment 4 of the present invention, and FIG. 4B is a flowchart.

In FIG. 4 (a), reference numeral 31 denotes a thermocouple (thermocouple), a heat sensor (not shown), etc., which are provided in large numbers so as to extend over the upper and lower surfaces of the heat exchange rotary element 7 (FIGS. 1 and 2). , A control device, 32 is a nozzle drive device (drive device of the motor 8 or 20 in FIG. 1), and 34 is a water injection device (pump).

In the third embodiment, a fire occurrence position detecting device 31 and a movable fire extinguishing nozzle (11 in FIG. 1 or 18 in FIG. 2) disposed on the upper surface of the heat exchange rotary element 7 are used.
And a control device 32, and the fire occurrence position detecting device 31
The controller 32 moves the movable fire extinguishing nozzle (11 or 18) to the fire occurrence position by the detection of the fire occurrence position, and sprays the fire extinguishing liquid to the fire occurrence position.

A plurality of thermocouples and heat sensors are installed on the upper and lower surfaces of the heat exchange rotary element 7 so that the thermocouples and the heat sensors are located near the fire occurrence position. The control device 32 identifies the coordinates of the fire occurrence position, and moves the fire extinguishing nozzle to that position to stop it. An apparatus related to this apparatus is described in Japanese Patent Application Laid-Open No. 2-197701 by the same applicant. As the fire occurrence position detection device 31,
The temperature monitoring device described in this publication may be applied and installed.

That is, as shown in FIG. 4 (b), the flow of the operation is as follows. The fire occurrence position is detected by the fire occurrence position detection device 31 (S1), and the control device 32 is operated by a signal from the fire occurrence position detection device 31. Drives the movable fire extinguishing nozzle (11 or 18) to move it to the position where the fire occurred (S
2) After that, the control device 32 controls the water injection device 34 such as a pump.
Is driven to spray the fire extinguishing liquid to the fire occurrence position (S3).

Fifth Embodiment FIG. 5A is a block diagram showing a configuration of a fire extinguishing system for a regenerative air preheater according to a fifth embodiment of the present invention, and FIG. 5B is a flowchart.

In FIG. 5 (a), reference numeral 31 denotes a fire occurrence position detection which is composed of a plurality of thermocouples, heat sensors, etc. installed so as to extend over the upper and lower surfaces of the heat exchange rotary element 7 (FIGS. 1, 2). Device, 32 is a control device, 3
Reference numeral 5 denotes a driving device for the stop valve of the nozzle, and reference numeral 34 denotes a water injection device (pump).

In the fifth embodiment, the fire occurrence position detecting device 31, a plurality of fire extinguishing nozzles (22 in FIG. 3) arranged on the upper surface of the heat exchange rotary element 7, and a stop valve (not shown) for the fire extinguishing nozzle A fire extinguishing nozzle (22) which is located above the fire occurrence position by detecting the fire occurrence position by the fire occurrence position detection device 31.
The fire extinguishing liquid is sprayed to the fire occurrence position by the fire extinguishing nozzle (22) with the stop valve opened.

That is, as shown in FIG. 5B, the fire occurrence position is detected by the fire occurrence position detecting device 31 (S
4) The fire extinguishing nozzle (22) at the fire occurrence position is selected based on the signal from the fire occurrence position detection device 31 (S5).
The control device 32 opens the stop valve of the fire extinguishing nozzle (22) located above the fire occurrence position (S6).
Drives the water injection device 34 to spray the fire extinguishing liquid to the fire occurrence position (S7).

Although the present invention has been specifically described based on the embodiments, the present invention is not limited to the above-described embodiments, and it is needless to say that various changes can be made without departing from the gist of the present invention. It is. For example, the fire extinguishing nozzle need not necessarily be substantially rod-shaped.

[0042]

As described above, according to the fire extinguishing system of the regenerative air preheater of the present invention, when a fire occurs in the heat exchange rotary element, regardless of the fire occurrence position, Further, even if the heat exchange rotating element becomes unable to rotate due to a fire, the fire extinguishing liquid can be effectively sprayed at the fire occurrence position, enabling quick initial fire extinguishing and preventing an increase in loss due to the fire.

[Brief description of the drawings]

FIG. 1A is a plan view showing a fire extinguishing system for a regenerative air preheater according to a first embodiment of the present invention, and FIG.
FIG. 3C is a cross-sectional view taken along a cutting line, and FIG.

FIG. 2A is a plan view showing a fire extinguishing system for a regenerative air preheater according to a second embodiment of the present invention, and FIG.
It is sectional drawing in a cutting line.

FIG. 3 is a plan view showing a fire extinguishing system for a regenerative air preheater according to Embodiment 3 of the present invention.

FIG. 4A is a configuration block diagram illustrating a fire extinguishing facility of a regenerative air preheater according to a fourth embodiment of the present invention, and FIG. 4B is a flowchart.

FIG. 5A is a configuration block diagram showing a fire extinguishing facility of a regenerative air preheater according to a fifth embodiment of the present invention, and FIG. 5B is a flowchart.

6A is a plan view showing a conventional fire extinguishing system for a regenerative air preheater, and FIG. 6B is a cross-sectional view taken along the line AA in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Regeneration air preheater, 2 ... Gas duct, 3 ... Air duct, 4 ... Seal plate, 5 ... Combustion gas, 6 ... Air, 7
... heat exchange rotary element, 8 ... heat exchange rotary element drive motor, 10 ... fire extinguishing liquid, 11 ... rotary fire extinguishing nozzle,
12: Fire extinguishing liquid spray opening, 13: Fire extinguishing nozzle drive motor, 14: Manual rotating handle, 15, 16 ... Gear, 17
... Bearing, 18 ... Parallel movement type fire extinguishing nozzle, 19 ... Warm gear, 20 ... Motor for driving fire extinguishing nozzle, 21 ... Manual rotating handle, 31 ... Fire occurrence position detecting device, 32 ...
Control device, 33: nozzle drive device, 34: water injection device, 3
5 ... Stop valve driving device.

Claims (6)

[Claims] 1. A regenerative air preheater characterized in that a movable fire extinguishing nozzle is disposed on an upper surface of a heat exchange rotary element, and the fire extinguishing nozzle is moved to a fire occurrence position to spray a fire extinguishing liquid. Fire extinguishing equipment. 2. A fire extinguishing nozzle having a substantially rod-like shape formed by arranging a plurality of openings for spraying a fire extinguishing liquid on the upper surface of the heat exchanging rotary element. A fire extinguishing system for a regenerative air preheater, which is rotatable about the same rotation axis as the replacement rotating element, and moves the fire extinguishing nozzle to a fire occurrence position to spray a fire extinguishing liquid. 3. A substantially rod-shaped fire extinguishing nozzle formed by arranging a plurality of fire extinguishing liquid spraying openings on an upper surface of the heat exchanging rotary element, wherein the fire extinguishing nozzle is arranged in parallel on the upper surface of the heat exchanging rotary element. A fire extinguishing system for a regenerative air preheater, which is movable and moves the fire extinguishing nozzle over a fire occurrence position to spray a fire extinguishing liquid. 4. A plurality of substantially rod-shaped fire-extinguishing nozzles formed by arranging a plurality of openings for spraying a fire-extinguishing liquid on the upper surface of the heat exchange rotary element, the fire-extinguishing nozzles having a stop valve for the fire-extinguishing liquid, A fire extinguishing system for a regenerative air preheater, characterized in that the stop valve of the fire extinguishing nozzle located above a fire occurrence position is opened to spray a fire extinguishing liquid. 5. A control system for detecting a fire occurrence position, comprising: a fire detection position detection device; a movable fire extinguishing nozzle disposed on an upper surface of the heat exchange rotary element; and a control device. A fire extinguishing system for a regenerative air preheater, wherein an apparatus moves the fire extinguishing nozzle to a position where a fire occurs and sprays a fire extinguishing liquid. 6. A fire occurrence position detecting device, comprising: a plurality of fire extinguishing nozzles disposed on the upper surface of the heat exchange rotary element; a stop valve for the fire extinguishing nozzle; and a control device. Wherein the control device opens the stop valve of the fire extinguishing nozzle on the fire occurrence position, and sprays the fire extinguishing liquid to the fire occurrence position by the fire extinguishing nozzle with the stop valve opened. Fire extinguishing equipment for preheater.