JPH1089621A - Rapid starter of pressurized fluidized bed boiler - Google Patents

Abstract

(57) [Problem] To provide a pressurized fluidized-bed boiler quick start-up device capable of feeding a bed material heated in advance into a fluidized-bed boiler main body at the time of start-up, thereby shortening the start-up time. A starting bed material supply device (39) for supplying a required amount of bed material (7) heated in advance to a fluidized bed boiler body (2) at the time of starting is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for rapidly starting 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.
Is provided with a fluidized-bed boiler main body 2, and a plurality of diffuser tubes 3 are disposed in a lower portion of the fluidized-bed boiler main body 2. The diffuser tubes 3 are pressurized in the pressure vessel 1. The air 4 is taken into a wind box 37 from an intake pipe 36 provided with an ash cooler 19 described later on the way, and is blown upward.

A fuel supply pipe 5 for supplying a fuel such as coal slurry is disposed above the air diffuser 3.
A bed material 7 mixed with a desulfurizing material such as limestone and coal ash for forming the fluidized bed 6 is supplied from a bed material storage container 24, and supplied from the compressor 8 into the pressure container 1. The pressurized air 4 is supplied from the intake pipe 36 to the diffuser pipe 3 via the wind box 37 and is jetted upward to form a fluidized bed 6, and the fuel supplied from the fuel supply pipe 5 is supplied to the fluidized bed 6. The water is heated by the heat transfer tube 9 disposed in the formation part of the fluidized bed 6 to generate steam by being stirred and efficiently burned.

[0004] The bed height of the fluidized bed 6 is controlled according to a boiler load command. When the bed height of the fluidized bed 6 is increased with an increase in load, a bed material storage container is required. L-shaped bed material injection pipe 25 connected to the bottom of
By supplying the pressurized air 4 in the pressure vessel 1 by adjusting the opening of the injection valve 26, the bed material storage vessel 2
When the bed material 7 in the bed 4 is injected into the fluidized-bed boiler main body 2 through the bed material injection pipe 25, and when the bed height of the fluidized bed 6 is lowered with a decrease in load, the bed material storage container 2
The bed material 7 in the fluidized-bed boiler main body 2 is reduced by reducing the internal pressure of the bed 4 by adjusting the opening degree of the extraction valve 27, so that the bed-material extracting pipe 2 protruding from the side of the fluidized-bed boiler main body 2.
8 to a bed material storage container 24.

If the bed material 7 in the fluidized-bed boiler body 2 increases due to ash or the like generated by combustion and the bed height of the fluidized bed 6 rises with respect to the current load, the ash and bed A part of the material 7 is a surplus as viewed in total, and the ash extraction hopper 1 provided below from the air diffuser 3 is provided.
After being dropped to 0 and taken out from the lower ash extraction pipe 11 to the lock hopper 30 via the L valve 29, it is cut out by the rotary valve 31 by a required amount into the discharge line 32, and is sucked by the operation of the blower 23. Discharge line 3
2 is introduced into the bed material silo 33, and the ash and the bed material 7 stored in the bed material silo 33 are appropriately cut out from the rotary valve 34,
It is carried out by a truck 35 or the like.

In the upper part of the fluidized bed boiler main body 2, a plurality (for example, six) of cyclones 14 through which a high-temperature and high-pressure exhaust gas 12 after heating water in the heat transfer tube 9 is guided through a branch duct 13. The ash in the exhaust gas 12 is disposed to separate the ash from the exhaust gas 12, and the exhaust gas 12 from which the ash has been separated by the cyclone 14 is sent to a gas turbine 16 provided outside the pressure vessel 1 via an exhaust gas pipe 15. The gas turbine 16 is supplied to drive the gas turbine 16. The gas turbine 16 drives the above-described compressor 8 and also drives the gas turbine generator 17 with excess power.

The separated ash 1 separated by the cyclone 14
8 is the ash cooler 19 from the intake pipe 36 to the wind box 3
After being cooled by the pressurized air 4 supplied to the air diffuser 3 through the ash transport pipe 7, the ash transport pipe 20 transports the compressed air to the outside of the pressure vessel 1. 37
The pressurized air 4 supplied to the air diffuser 3 via the ash cooler 19 is heated by depriving the separated ash 18 of heat in the ash cooler 19 and then jetted upward to form the fluidized bed 6.

Incidentally, the bed material storage container 24 is usually
Plural pieces are provided, and the total capacity is set to a capacity enough to store the bed material 7 required when the operation is performed with a load of 100% in the fluidized-bed boiler main body 2.

In the case of the pressurized fluidized-bed boiler as described above, at the time of normal shutdown such as at the weekend, first, in order to reduce the load, the internal pressure of the bed material storage container 24 is reduced by adjusting the opening of the extraction valve 27. As a result, the fluidized-bed boiler body 2
The bed material 7 in the inside is transferred from a bed material extraction pipe 28 projecting from the side of the fluidized bed boiler main body 2 to a bed material storage container 24.
After the height of the fluidized bed 6 is reduced to a certain level and the supply of fuel from the fuel supply pipe 5 is stopped, the bed material storage container 24 is controlled by adjusting the opening of the extraction valve 27 in the same manner as described above.
The bed material 7 in the fluidized-bed boiler main body 2 is pulled out from the bed material extraction pipe 28 into the bed material storage container 24 by reducing the internal pressure of the fluidized-bed boiler 2, the bed height of the fluidized bed 6 is reduced to the minimum bed height, and the gas turbine 16 is stopped. It is supposed to.

After the pressurized fluidized bed boiler is normally stopped, when the bed material 7 in the fluidized bed boiler main body 2 and the bed material storage container 24 is started from a state of being cooled to about room temperature, the gas turbine 16 is started. After activation, an L-shaped bed material injection pipe 25 connected to the bottom of the bed material storage container 24
By supplying the pressurized air 4 in the pressure vessel 1 by adjusting the opening of the injection valve 26, the bed material storage vessel 2
The bed material 7 in the bed 4 is injected into the fluidized-bed boiler main body 2 through the bed material injection pipe 25, the bed height of the fluidized bed 6 is raised from the minimum bed height to the starting bed height, and the wind box 37 is removed from the intake pipe 36. The pressurized air 4 supplied to the diffuser 3 via the
The bed material 7 of the fluidized bed 6 held at the height of the starting bed is heated to a required temperature (about 600 [° C.]) by jetting upward while heating with the fuel supply pipe 5. When the temperature of the bed material 7 rises to about 800 [° C.], the starting burner 38 is extinguished.

[0011]

However, as described above, when the pressurized fluidized-bed boiler is started up and the bed material 7 of the fluidized bed 6 is heated using only the start-up burner 38, especially after a long-term can-stop. There is a disadvantage that it takes a very long time (about 6 hours) when the bed material 7 is cooled.

The present invention has been made in view of the above circumstances and provides a pressurized fluidized-bed boiler quick start-up apparatus capable of feeding a pre-heated bed material to a fluidized-bed boiler main body at the time of start-up, thereby shortening the start-up time. It is something to offer.

[0013]

According to the present invention, a pressurized fluidized bed boiler is provided with a starting bed material supply device for supplying a preheated required amount of bed material to a fluidized bed boiler body at the time of starting. Of the present invention.

In the apparatus for rapidly starting a pressurized fluidized-bed boiler, a start-up bed material storage container capable of storing a required amount of bed material at the time of start-up and charging the bed material into a fluidized-bed boiler main body; A starting bed material supply device can be configured from a starting bed material heating hot blast furnace capable of supplying hot air into the starting bed material storage container.

According to the above means, the following effects can be obtained.

When the pressurized fluidized-bed boiler is started after a normal stop, a required amount of bed material heated in advance from the starting bed material supply device is supplied to the fluidized-bed boiler main body, and the bed height of the fluidized bed becomes the starting bed height. As soon as it rises, the fuel can be injected into the fluidized bed, without requiring a long time.

[0017] A starting bed material storage container capable of storing a required amount of bed material at the time of starting and capable of putting the bed material into the fluidized bed boiler main body, and supplying hot air into the starting bed material storing container. When the starting bed material supply device is configured from the starting bed material heating hot stove and the starting bed material stored in the starting bed material storage container, the required amount of bed material at the time of starting is supplied from the starting bed material heating hot stove. It is preheated by the supplied hot air.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an example of an embodiment of the present invention. In the figure, the portions denoted by the same reference numerals as those in FIG. 2 represent the same components, and the basic configuration is the same as that of the conventional device shown in FIG. Although the present embodiment is similar to that of the first embodiment, as shown in FIG. 1, a starting bed material supply device 3 for supplying a preheated required amount of bed material 7 to a fluidized bed boiler main body 2 at the time of starting, as shown in FIG.
9 is provided.

The starting bed material supply device 39 is capable of storing a required amount of the bed material 7 at the time of starting and is capable of putting the bed material 7 into the fluidized bed boiler main body 2 via the L valve 40. The starting material storage container 41 and a hot bed furnace 43 for heating the starting bed material capable of supplying hot air from the burner 42 into the starting bed material storage container 41 are provided.

A part of the bed material 7 stored in the bed material silo 33 is introduced into the starting bed material storage container 41 through the lock hopper 46 by opening and closing the valves 44 and 45. .

When the bed material 7 stored in the starting bed material storage container 41 is heated, the compressor 47
Is driven, and compressed air from the compressor 47 is supplied to the hot bed furnace 43 for heating the starting bed material through a valve 48 as combustion air for the burner 42, and is also used for dilution for temperature control. The air is supplied as air to the downstream side of the hot-bed stove 43 for heating the bed material for start-up through a valve 49, and hot air at a required temperature is supplied into the storage unit 41 for start-up bed material via a valve 50. After heating the bed material 7 in the storage container 41, the bed material 7 is discharged to the outside via a valve 51 and a throttle 52.

Further, when the bed material 7 is supplied from the starting bed material storage container 41 to the fluidized-bed boiler main body 2 at the time of starting, the compressed air from the compressor 47 is supplied to the L valve 40 via the valves 53 and 54. The bed material 7 in the starting bed material storage container 41 is supplied to the fluidized-bed boiler main body 2.

Next, the operation of the illustrated example will be described.

During normal operation, the bed material silo 33
A part of the bed material 7 stored in the bed is introduced into the starting bed material storage container 41 through the lock hopper 46 by opening and closing the valves 44 and 45, and the required amount of the bed material 7 is stored at the time of starting. It is stored in the container 41.

When a required amount of the bed material 7 is stored in the starting bed material storage container 41 at the time of starting, the valves 53 and 54 are provided.
Is closed, the compressor 47 is driven and the burner 42 of the hot-air stove 43 for starting bed material heating is ignited,
Compressed air from the compressor 47 is supplied to the hot bed furnace 43 for heating the starting bed material through a valve 48 as combustion air for the burner 42 via a valve 48, and a valve 49 is used as dilution air for temperature control. Is supplied to the downstream side of the hot bed furnace 43 for heating the bed material for starting, and the hot air at a required temperature is supplied through the valve 50 to the bed material for starting bed 4
1 and heats the bed material 7 in the starting bed material storage container 41, and then is discharged to the outside via the valve 51 and the throttle 52. The bed material 7 is at the required temperature (about 650-7
00 [° C.]).

After the pressurized fluidized-bed boiler is normally stopped, when the bed material 7 in the fluidized-bed boiler main body 2 and the bed material storage container 24 is started from a state of being cooled to about room temperature, the fluidized-bed boiler main body 2 The bed material 7 inside the bed material extraction pipe 2
The gas turbine 16 is started after the bed height is set to 0 (upper end of the diffuser pipe 3) by extracting the bed material from the bed material storage bed 8 to the bed material storage container 24 and discharging the bed material from the ash hopper 10, and the starting burner 38 is ignited and dispersed. Hot air from trachea 3 (approximately 800
[° C]) and the valves 48, 49, 5
When the compressed air from the compressor 47 is introduced into the L valve 40 via the valves 53 and 54, the heated bed material 7 in the starting bed material storage container 41 is supplied to the fluidized-bed boiler main body 2. Is done.

The bed material 7 supplied to the fluidized bed boiler main body 2 is heated in advance in the starting bed material storage container 41 and has a high temperature. Therefore, the bed height of the fluidized bed 6 rises to the starting bed height. This makes it possible to immediately supply fuel from the fuel supply pipe 5 and burn it.

Instead of introducing a part of the bed material 7 stored in the bed material silo 33 into the starting bed material storage container 41 via the lock hopper 46, a discharge line 32 is provided.
It goes without saying that a part of the bed material 7 may be introduced into the starting bed material storage container 41 via the lock hopper 46 in the middle.

In this way, the bed material 7 which has been heated in advance can be put into the fluidized bed boiler body 2 at the time of startup, and the startup time can be shortened.

The apparatus for rapidly starting a pressurized fluidized-bed boiler according to the present invention is not limited to the above-described embodiment.
It goes without saying that various changes can be made without departing from the spirit of the present invention.

[0032]

As described above, according to the apparatus for rapidly starting a pressurized fluidized-bed boiler of the present invention, a bed material heated in advance can be introduced into a fluidized-bed boiler body at the time of starting.
An excellent effect that the startup time can be shortened can be obtained.

[Brief description of the drawings]

FIG. 1 is an overall schematic configuration diagram of an example of an embodiment of the present invention.

FIG. 2 is an overall schematic configuration diagram of a conventional example.

[Explanation of symbols]

 2 Fluidized bed boiler main body 7 Bed material 39 Starting bed material supply device 41 Starting bed material storage container 43 Hot air stove for starting bed material heating

Claims (2)

[Claims] An apparatus for rapidly starting a pressurized fluidized bed boiler, comprising a starting bed material supply device for supplying a required amount of bed material heated in advance to a fluidized bed boiler main body at the time of starting. 2. A starting bed material storage container capable of storing a required amount of bed material at the time of starting and capable of putting the bed material into a fluidized bed boiler main body, and supplying hot air into the starting bed material storing container. 2. The rapid start-up device for a pressurized fluidized-bed boiler according to claim 1, wherein a start-up bed material supply device is constituted by a possible start-up bed material heating hot air furnace.