JPH0979563A - Cyclone cleaning device for pressurized fluidized bed boiler - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To enable cleaning of an inner surface of a cyclone in a short time efficiently and in a good working atmosphere. SOLUTION: A rotation drive device 35 that can be fixed to an upper inspection port flange 24 from which an upper closing flange 25 of the cyclones 14 and 17 is removed, and an upper end thereof is connected to the rotation drive device 35 and is inserted into a cyclone main body 23. A center support member 37 having a rotary joint 36, a locking member 39 which is attached to the lower portion of the rotary joint 36 and can be locked to the lower inspection port flange 28 from which the lower closing flange is removed, and the radius of the inner surface of the cyclone body 23. A cleaning wire 38 having a longer length and having a plurality of small diameters attached along the longitudinal direction of the center support member 37, and by rotating the cleaning wire 38 together with the center support member 37, the tip of the cleaning wire 38 To collide with the inner surface of the cyclone main body 23 to remove the ash 15 adhering thereto.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cyclone cleaning device for a pressurized fluidized bed boiler.

[0002]

2. Description of the Related Art An example of a pressurized fluidized-bed boiler will be described with reference to FIG.
A fluidized bed boiler 2 is provided inside, and a plurality of air diffusers 3 extending in the left-right direction in the drawing are arranged side by side in the lower part in the fluidized bed boiler 2. Pressure vessel 1
The pressurized air 4 inside is taken in through the lower intake port 3a and jetted upward.

A fuel supply pipe 5 for supplying a fuel such as coal particles or coal slurry is disposed above the air diffuser pipe 3, and desulfurization material such as limestone for forming a fluidized bed 6 and sand are also provided. The mixed bed material 7 is supplied, and the pressurized air 4 supplied from the compressor (not shown) into the pressure vessel 1 by the air supply port 8 is supplied from the lower intake port 3a to the diffuser pipe 3 and is jetted upward. As a result, the fluidized bed 6 is formed, and the fuel supplied from the fuel supply pipe 5 flows into the fluidized bed 6
By being agitated and efficiently burned in the inside of the container, the water is heated by the heat transfer tube 9 arranged in the formation portion of the fluidized bed 6 to generate steam.

Further, the ash produced by the combustion and a part of the bed material 7 fall from between the air diffusers 3 to the ash discharge hopper 10 provided on the lower side, and the ash discharge pipe 11 at the lower part is removed. It is designed to be taken out through the bottom.

At the upper part of the fluidized bed boiler 2, a plurality of (for example, 6) cyclones 14 are arranged so that the high temperature and high pressure exhaust gas 12 is introduced tangentially by an exhaust gas duct 13 branched into a plurality of parts. Ashes 1 in the exhaust gas 12
5 are separated.

Further, the exhaust gas outlets of the respective cyclones 14 are further connected to a second-stage cyclone 17 (for example, 6) via an exhaust gas duct 16 to separate the ash 15 in the exhaust gas 12 in two stages. I am trying to do it.

The exhaust gas 12 from which the ash 15 has been separated by the cyclones 14 and 17 is supplied via an exhaust gas pipe 18 to a gas turbine (not shown) arranged outside the pressure vessel 1 to drive the gas turbine. The gas turbine generator is driven by surplus power as well as driving the compressor described above.

An ash extraction chamber 19 is formed in the lower portion of each of the cyclones 14 and 17, and an ash extraction pipe 20 connected to each ash extraction chamber 19 is bent in the pressure container 1 to bend the ash cooler. 21 to form the compressed air 4
The ash 15 is cooled by means of the ash cooler 21, and each ash extraction pipe 20 after the ash cooler 21 is formed is connected to a decompression tank (not shown) provided outside the pressure vessel 1 and an ash processing device. There is. Since the pressure inside the cyclones 14 and 17 is high and the pressure inside the decompression tank is low (atmospheric pressure), pressure reduction in the decompression tank causes ash in the lower part of the cyclones 14 and 17 due to the differential pressure. The ash 15 that has fallen into the take-out chamber 19 is sucked and discharged to the outside by each ash take-out pipe 20.

FIG. 4 shows the structure of the cyclones 14 and 17, and the cyclones 14 and 17 are exhaust gas ducts 13 and 16 for introducing the exhaust gas 12 of the fluidized bed boiler 2.
Is tangentially connected to the outer circumference of the upper end and has a cyclone main body 23 having a tapered portion 22 whose diameter decreases toward the lower part, and is penetrated through the center of the upper part of the cyclone main body 23. A central pipe 26 provided with the upper inspection port flange 24 closed by an upper closing flange 25, an exhaust gas discharge pipe 27 connected to an outer side surface of the cyclone body 23 of the central pipe 26, and a taper of the cyclone body 23. An ash extraction chamber 19 formed at the lower end of the portion 22 and provided with a lower inspection port flange 28 at the lower end, and the lower inspection port flange 28 is closed by a lower closing flange 29;
An ash extraction pipe 20 that opens inside the ash extraction chamber 19 is provided. Reference numeral 31 in the drawing denotes a bolt fixing the upper closing flange 25 and the lower closing flange 29.

In the cyclones 14 and 17, the exhaust gas 12 tangentially introduced from the exhaust gas ducts 13 and 16 is
A swirl flow is formed in the cyclone body 23, and the particles of the ash 15 are moved downward by the centrifugal force along the inner surface of the cyclone body 23 and fall into the ash extraction chamber 19, and the exhaust gas 12 from which the ash 15 is separated is at the center. It is guided from the pipe 26 to the upper part and taken out to the outside from the exhaust gas discharge pipe 27.

On the other hand, the ash 15 that has fallen into the ash extraction chamber 19
Is sucked by the ash extraction pipe 20 whose pressure is reduced in the pressure reduction tank and removed to the outside.

In the cyclones 14 and 17, ash 15 adheres to the inner surface of the cyclone main body 23 as shown in FIG. 4 due to the nature of the exhaust gas 12 or the unevenness of the inner surface of the cyclone main body 23. If so, the ash 15 having a gradually increasing thickness and increasing the layer thickness may be peeled off and fall off.

When the layer thickness of the ash 15 becomes large and falls into the ash removal chamber 19 as described above, there is a problem that the ash 15 blockages the opening of the ash removal pipe 20 and disables the removal of the ash 15. Occurs.

Therefore, conventionally, as described above, the ash 15 adhering to the inner surface of the cyclone body 23 is prevented from growing.
The inner surface of the cyclone body 23 is regularly cleaned.

FIG. 5 shows a general example of a conventional cleaning device for the inner surface of the cyclone body 23. As shown in the drawing, the upper closing flange 25 and the lower closing flange 29 are removed by loosening bolts 31 and then the upper portion. An air hose 32 is inserted from the inspection port flange 24 into the cyclone main body 23 through the center pipe 26, and while the compressed air 33 is jetted from the lower end by the air hose 32, an operator manually supports the upper part of the air hose 32. By moving the air hose 32 up or down, or by bending the lower end of the air hose 32 outward and rotating it at the rotary joint 32a to change the spraying direction, and the ash 15 on the inner surface of the cyclone body 23 adheres. The compressed air 33 is blown to the portion where it is removed.

[0016]

However, in the conventional cyclone cleaning device shown in FIG. 5, the air hose 32 is inserted from the upper inspection port flange 24 into the cyclone body 23 and the compressed air 33 is blown. ,
The ash 15 adhering to the inner surface of the cyclone main body 23 is removed, but the range in which the ash 15 can be removed by spraying the compressed air 33 is relatively narrow, and the compressed air 33 is sprayed accurately at the target position. Since the work is difficult, it takes a long time to remove the attached ash 15.
Moreover, a large number of cyclones 14, 1 are installed in the pressurized fluidized bed boiler.
7, all cyclones 14, 17 are equipped.
It took a very long time to finish the cleaning.

Further, in the method of removing the ash adhered by blowing the compressed air 33 as described above, the removed ash 15 is blown out from the cyclones 14 and 17 and scattered to the surroundings, so that a very atmosphere is created. It had the problem of being forced to work in bad conditions.

The present invention has been made in view of the above circumstances, and is a cyclone cleaning device for a pressurized fluidized bed boiler that can clean the inner surface of the cyclone efficiently in a short time in a good working atmosphere. Is intended to provide.

[0019]

In a cyclone cleaning device for a pressurized fluidized bed boiler of the present invention, an exhaust gas duct for introducing the exhaust gas of the pressurized fluidized bed boiler is tangentially connected to the outer periphery of the upper end and has a diameter toward the lower part. A cyclone body having a taper portion that decreases, and a penetratingly arranged in the upper center of the cyclone body,
An upper inspection port flange is provided at the outer upper end, and a central pipe in which the upper inspection port flange is closed by an upper closing flange, an exhaust gas discharge pipe connected to an outer side surface of the cyclone main body of the central pipe, and the cyclone main body An ash extraction chamber formed at the lower end of the taper portion and provided with a lower inspection port flange at the lower end, the lower inspection port flange being closed by a lower closing flange, and an ash extraction pipe opening in the ash extraction chamber are provided. A cyclone cleaning device for a pressurized fluidized bed boiler,
A rotary drive device that can be fixed to the upper inspection port flange from which the upper blocking flange has been removed; a center support member having an upper end connected to the rotary drive device and inserted into the cyclone main body; An engaging member attached to the lower part of the rotary joint and capable of engaging with the lower inspection port flange from which the lower closing flange has been removed; and a longitudinal direction of the center support member having a length longer than the radius of the inner surface of the cyclone body. A plurality of cleaning wires having a small diameter are attached along the line.

Further, an elastic elastic member is interposed between the rotary joint and the locking member.

In the present invention, the central support member having the cleaning wire having a length longer than the radius of the inner surface of the cyclone main body is linearly arranged in the cyclone main body, and the central support member is rotated by the rotary drive device. As a result, the tip of the rotating cleaning wire continuously collides with the inner surface of the cyclone body,
Ash attached to the inner surface of the cyclone body is efficiently removed in a short time.

The ash removed from the inner surface of the cyclone body by the cleaning device falls into the ash extraction chamber and is taken out from the lower inspection port flange, so that the working atmosphere is not deteriorated.

Further, since the elastic member is provided between the rotary joint and the locking member, the center support member can be easily formed.
It can be surely held straight.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an example of an embodiment of the present invention applied to the cyclone of the pressurized fluidized bed boiler shown in FIG. 3, in which the same symbols are assigned to the same components. It represents.

As shown in FIGS. 1 and 2, the cleaning device 34 of the present invention includes a rotary drive device 35 which can be fixed to the upper inspection port flange 24 from which the upper closing flange 25 of FIG. Is attached to the rotary drive device 35 by a joint 3
5a, which is connected through 5a and is inserted into the cyclone body 23, and has a center support member 37 having a rotary joint 36 at its lower portion, and the center support member 37 having a length slightly longer than the radius of the inner surface of the cyclone body 23. A plurality of cleaning wires 38 having a small diameter are attached along the longitudinal direction of the cleaning wire 38. At this time, since the cyclone body 23 is provided with the taper portion 22 in the lower portion, the length of the cleaning wire 38 is shorter in the lower portion than in the upper portion.

The center support member 37 is composed of, for example, twisted wires, and the cleaning wire 38 having the small diameter is knitted and fixed to the wire,
Alternatively, it is possible to use a structure in which a thin cleaning wire 38 is attached to the outer peripheral surface of a rod- or pipe-shaped center support member 37 by welding or screwing.

Further, at the lower end of the rotary joint 36, there is attached a hook 39 or a locking tool 39 which can be fixed to the lower inspection port flange 28 with a bolt or the like. FIG.
In the case of, the pin 39a is attached to the lower end of the center support member 37
A hook 39b is attached so that it can be bent, and the hook 39b can be linearly opened and locked to the lower inspection port flange 28 as shown in FIG.

Further, in order to keep the central support member 37 in a linearly tensioned state, an elastic elastic member 40 is interposed between the rotary joint 36 and the locking member 39.

Next, the operation of the above embodiment will be described.

After the operation of the pressurized fluidized bed boiler shown in FIG. 3 is stopped and the cyclones 14 and 17 are cooled to a predetermined temperature, the upper closing flange 25 and the lower closing flange 29 shown in FIG. 4 are removed by loosening bolts 31. As shown in FIG. 1, the center support member 37 of the cleaning device 34 of FIG. 2 is passed through the center pipe 26 from the upper inspection port flange 24 and the cyclone main body 23.
Insert the rotary drive 35 into the upper inspection port flange 2
Fix to 4.

On the other hand, an engaging member 39 attached to the lower end of the center support member 37 via a rotary joint 36 and an elastic elastic member 40 is hooked on the lower inspection port flange 28 or fixed by bolts. Stop it.

At this time, if the expandable elastic member 40 is interposed between the rotary joint 36 and the locking member 39, the center support member 37 is pulled by locking the locking member 39. Can be held in a linearly tense state.

When the rotary drive unit 35 is driven in the above state, the center support member 37 rotates between the center support member 37 and the rotary joint 36, and the rotation of the center support member 37 causes a large number of cleaning wires 3 having a small diameter.
8 also rotates. At this time, since the cleaning wire 38 has a length longer than the radius of the inner surface of the cyclone main body 23, the tip of the cleaning wire 38 continuously collides with the inner surface of the cyclone main body 23 and the ash attached to the inner surface of the cyclone main body 23. 15 can be efficiently removed in a short time.

Further, the ash 15 removed from the inner surface of the cyclone main body 23 by the cleaning device 34 of the present invention falls into the ash extraction chamber 19 and is taken out from the lower inspection port flange 28, so that the ash receiving container 41 is arranged at the lower part. By collecting the removed ash 15 in this way, it is possible to prevent the ash 15 from falling down and scattering and to prevent the working atmosphere from deteriorating.

[0036]

According to the cyclone cleaning device for a pressurized fluidized bed boiler of the present invention, a central support member having a cleaning wire having a length longer than the radius of the inner surface of the cyclone body is linearly arranged in the cyclone body. However, since the center support member is rotated by the rotation drive device, the tip of the rotating cleaning wire continuously collides with the inner surface of the cyclone main body, and the ash attached to the inner surface of the cyclone main body is efficiently transferred in a short time. Can be removed.

Since the ash removed from the inner surface of the cyclone body by the cleaning device falls into the ash extraction chamber and is taken out from the lower inspection port flange, the working atmosphere is not deteriorated.

Further, since the expansion and contraction elastic member is provided between the rotary joint and the locking member, the center support member can be easily formed.
It can be surely held straight.

[Brief description of drawings]

FIG. 1 is a cut side view of a cyclone showing a usage state of a cleaning device of the present invention.

FIG. 2 is a side view showing an example of an embodiment of a cleaning device of the present invention.

FIG. 3 is a cut side view showing an example of a pressurized fluidized bed boiler.

FIG. 4 is a cut side view showing an example of a cyclone.

FIG. 5 is a cut side view of a cyclone showing a usage state of a conventional cleaning device.

[Explanation of symbols]

 12 Exhaust gas 13 Exhaust gas duct 14 Cyclone 15 Ash 16 Exhaust gas duct 17 Cyclone 19 Ash extraction chamber 20 Ash extraction pipe 22 Tapered part 23 Cyclone body 24 Upper inspection port flange 25 Upper obstruction flange 26 Center pipe 27 Exhaust gas outlet pipe 28 Lower inspection port flange 29 Lower closure flange 34 Cleaning device 35 Rotation drive device 36 Rotary joint 37 Center support material 38 Cleaning wire 39 Locking tool 40 Elastic elastic member

Claims (2)

[Claims] 1. A cyclone main body having a taper portion in which an exhaust gas duct for introducing the exhaust gas of a pressurized fluidized bed boiler is tangentially connected to the outer periphery of the upper end and the diameter decreases toward the lower part, and at the center of the upper part of the cyclone main body. A central pipe, which is disposed through and is provided with an upper inspection port flange on the outer upper end, and the upper inspection port flange is closed by an upper closing flange, and an exhaust gas discharge pipe connected to the external side surface of the cyclone body of the central pipe,
An ash extraction chamber formed at the lower end of the taper portion of the cyclone body, having a lower inspection port flange at the lower end, the lower inspection port flange being closed by a lower closing flange, and an ash extraction pipe opening in the ash extraction chamber. A cyclone cleaning device for a pressurized fluidized bed boiler, comprising: a rotary drive device that can be fixed to an upper inspection port flange from which the upper blocking flange has been removed; and a cyclone body whose upper end is connected to the rotary drive device. A center support member that is inserted into the lower part of the rotary joint, has a lower part that has a rotary joint, and a locking device that is attached to the lower part of the rotary joint and that can be locked to the lower inspection port flange from which the lower closing flange is removed; A pressure fluidized bed boiler, comprising a plurality of small-diameter cleaning wires having a length longer than the radius of the inner surface and attached along the longitudinal direction of the center support member. Ron cleaning device. 2. The cyclone cleaning device for a pressurized fluidized bed boiler according to claim 1, wherein an elastic elastic member is interposed between the rotary joint and the locking tool.