JP2756213B2 - Power unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power plant in which coal or the like is burned at a pressure higher than the atmospheric pressure to generate a high-temperature gas, particularly when the furnace is isolated while maintaining the pressure in an abnormal condition. The present invention relates to a power unit suitable for reducing pressure and temperature in the furnace.

[0002]

2. Description of the Related Art A power unit conventionally used in a pressurized fluidized bed combustion plant is disclosed, for example, in Japanese Patent Application Laid-Open No. Sho 62-17873.
As shown in FIG. 6 and FIG. 7, a furnace 4 for burning coal or the like at a pressure higher than the atmospheric pressure to generate a high-temperature gas and supplying compressed air to the furnace 4 are described. Driven by the compressor 1 and the high-temperature gas from the furnace 4,
A first pipe 8 having a first shut-off valve 5 while connecting the compressor 1 and the furnace 4 with the expansion turbine 2 for driving the compressor 1 and the generator 3;
A second pipe 9 having a second shut-off valve 6 connected to the furnace 4 and the expansion turbine 2, and a second pipe 9 upstream of the first shut-off valve 5 of the first pipe 8 and the second pipe 9. There has been proposed a configuration in which the downstream side of the second shutoff valve 6 is connected and a first bypass pipe 11 having a bypass valve 10 is provided.

In the above-described power unit, during normal operation, as shown in FIG. 6, two shutoff valves 5 and 6 are opened, a bypass valve 10 is closed, and compressed air from the compressor 1 is supplied to the first shutoff valve. 5
When the gas is sent to the furnace 4 through the furnace, high-temperature gas is generated in the furnace 4, and is sent to the expansion turbine 2 through the second shut-off valve 6 to rotate the expansion turbine 2, and the compressor 1 and the generator 3 Rotate.

Next, a case where a trouble occurs in the power unit will be described with reference to FIG. For example, furnace 4
The supply of the high-pressure gas from the turbine to the expansion turbine 2 may increase abnormally. In this case, if this is maintained, the expansion turbine 2 causes a sudden speed change or load change. Therefore, the shutoff valves 5 and 6 are closed to shut off the supply of the compressed air from the compressor 1 to the furnace 4 and to cut off the supply of the high-pressure gas from the furnace 4 to the expansion turbine 2. At this time, if the shutoff valve 5 is suddenly fully closed, there is no place for the compressed air from the compressor 1 to go. Therefore, the bypass valve 10 is opened to allow the compressed air to bypass the expansion turbine 2.

[0005] When the furnace 4 itself is abnormal, the same method as described above is performed.

[0006]

In the above prior art, when an abnormality occurs in the power unit, both shutoff valves are closed to shut off the furnace, the compressor and the expansion turbine. for that reason,
The pressure in the furnace remains at the high operating pressure. Moreover, when the fuel is coal or the like, the combustion in the furnace does not stop immediately even if the supply air is shut off, so that the gas in the furnace remains at a sufficiently high temperature. However, since the amount of supplied air is not sufficient, toxic gas such as carbon monoxide may be generated in the furnace due to incomplete combustion or the like. Also, in order to recover the abnormality and restart the power unit,
It is necessary to quickly return the pressure in the furnace to the normal pressure state at the time of starting. However, sudden opening of the shutoff valve between the furnace and the expansion turbine means that the toxic gas flows out at a high temperature and is supplied to the stopped expansion turbine,
No consideration was given to this point, and the equipment could be damaged. Dust such as coal ash generated when burning coal in a furnace is mixed with high-pressure gas and sent to the expansion turbine.However, no consideration is given to this point, and the operation of the expansion turbine is not considered. The wings could be worn by dust.

[0007] A first object of the present invention is to generate an abnormality.
It is an object of the present invention to provide a power plant capable of quickly and safely reducing the pressure in a furnace to a normal pressure state at the time of starting when the furnace is isolated from a compressor and an expansion turbine.

[0008] A second object of the present invention is to generate an error.
It is an object of the present invention to provide a power unit that can cool high-pressure gas from a furnace and improve the reliability of equipment when the furnace is isolated from a compressor and an expansion turbine.

A third object of the present invention is to separate dust such as ash generated when burning fuel in a furnace from high-pressure gas, and to prevent damage to equipment connected to the inside of the expansion turbine and to the exhaust pipe of the expansion turbine. It is an object of the present invention to provide a power unit capable of preventing such a failure.

[0010]

[0011]

Means for Solving the Problems The first and second eyes described above are used.
In order to achieve the target, in the present invention, a furnace for burning a fuel such as coal at a pressure higher than the atmospheric pressure to generate a high-temperature gas, a compressor for supplying compressed air to the furnace, and a high-temperature Gas- driven compressor and power generator
Expansion turbine that drives the compressor, and compression from the compressor
The air is sent to the furnace and the flow is shut off.
A first pipe having a shut-off valve and a high-temperature gas from the furnace;
To the expansion turbine and shut off the flow rate
A second pipe having a second shut-off valve, and a first pipe described above.
Of the first shutoff valve upstream of the second shutoff valve and the second shutoff valve of the second pipe.
Connect the downstream side of the valve cutoff and have a bypass valve
In a power plant with one bypass pipe ,
When the first and second shut-off valves are closed, the height from the furnace increases.
The pressurized gas is distributed from the upstream side of the second shut-off valve of the second pipe.
Divide and send to the expansion turbine exhaust pipe and adjust the flow rate
Provide a second bypass pipe with a valve, and
The compressed air is supplied to the first pipe downstream of the first shut-off valve.
And a first control valve in the second bypass pipe.
A third bypass pipe to be sent to the upstream side is provided .

In order to achieve the first to third objects ,
In the present invention, the second pipe is disposed upstream of the second shut-off valve.
And remove dust from the high pressure gas from the furnace
While installing a dust removal device that feeds to the pipe 2
When the first and second shut-off valves are closed, the high-pressure gas from the furnace is
Branch from the upstream side of the second shut-off valve of the second pipe.
To the exhaust pipe of the expansion turbine, and set the flow control valve
And a second bypass pipe having
Compress the compressed air from the downstream side of the first shutoff valve of the first pipe.
Branch, upstream of the first control valve in the second bypass pipe.
A third bypass pipe to be sent to the side is provided .

[0013] Further , the dust removing device includes a hopper and the hopper.
Are installed above and to the side of the
Gas inlet connected to the pipe and below the gas inlet
In addition to providing a gas outlet for
A plurality of filters having a large number of holes for passing only gas are provided.

[0014] To achieve the above first to third objects, the present invention, distribution to the shut-off valve upstream of the second pipe
And two hoppers connected vertically
High pressure gas from the furnace is
When supplied from the inlet, it is included in the high-pressure gas by the filter.
Remove dust and remove high pressure gas only
The gas is discharged from the gas outlet to the second pipe,
Some high-pressure gas contained in the strike is dropped into the lower hopper.
While separating dust and high pressure gas
Only from the second gas outlet to the second bypass pipe,
A dust removal device that discharges dust from the dust outlet below.
When the first and second shut-off valves are closed due to normal occurrence,
The high-pressure gas from which dust from the device has been removed is supplied to the second distribution system.
Branching from the upstream side of the second shut-off valve of the pipe,
Second bypasser which feeds the exhaust pipe of the
Pipe and compressed air from the compressor
The first branch valve branches off from the downstream side to the second bypass pipe.
And a third bypass pipe for sending upstream of the first control valve in the first control valve
It is a thing.

[0015]

[0016]

[0017]

According to the present invention, the abnormality occurrence, the first pipe
And the first shut-off valve and the second
2 When the shut-off valve is closed, the upstream side of the second shut-off valve of the second pipe
Exhaust of expansion turbine by second bypass pipe branched
The pressure inside the furnace is quickly and safely reduced because it is discharged to a pipe.
Can reduce the amount of compressed air inside the furnace.
Toxicities such as carbon monoxide due to incomplete combustion due to lack of fuel
Prevent gas generation and improve equipment reliability
I can do it. Moreover, the first shutoff of the first pipe is performed.
The first bypass pipe branched from the downstream side of the valve allows the
The compressed air downstream of the first shut-off valve of the pipe is passed through a second bypass pipe.
To the high pressure gas.
Then, the cooled high-pressure gas is discharged to the exhaust pipe through the first control valve.
As a result, the reliability of the device can be further improved.

Further, according to the present invention , dust such as coal ash contained in the high-pressure gas is removed by the dust removing device provided on the upstream side of the second shut-off valve of the second pipe. Then, during normal operation, the high-pressure gas from which the dust is separated is sent to the expansion turbine, so that damage to equipment in the expansion turbine can be prevented. Further, when the first shut-off valve and the second shut-off valve provided respectively on the first pipe and the second pipe are closed due to the occurrence of an abnormality, the high-pressure gas from which dust is separated by the dust removing device is supplied to the second pipe. A third bypass pipe branched from the first pipe through the second bypass pipe branched from the first pipe and discharged to the exhaust pipe of the expansion turbine while the compressed air downstream of the first shut-off valve of the first pipe is branched from the first pipe. through feed in the middle of the second bypass pipe, since cooling the high pressure gas, can be devices connected to the device and the exhaust pipe in the expansion turbine is prevented from being damaged by dust <br/> strike , This point
It is possible to improve the reliability of the equipment from.

Further , according to the present invention , the second piping
Connect the dust removal device provided on the upstream side of the shut-off valve vertically.
When high-pressure gas from a furnace is fed into the upper hopper, dust contained in the high-pressure gas is removed, and dust and a part of the dust are contained. The high-pressure gas is dropped into the lower hopper to separate dust and high-pressure gas, and only the high-pressure gas is sent to the second bypass pipe to discharge dust from below. During normal operation, since the second shut-off valve is open, high-pressure gas separated from dust in the upper hopper can be sent to the expansion turbine to prevent damage to equipment in the expansion turbine. When an abnormality occurs, high-pressure gas separated from dust from the lower hopper is discharged to the exhaust pipe of the expansion turbine,
The compressed air downstream of the first shut-off valve of the pipe is sent through the third bypass pipe branched from the first pipe to the middle of the second bypass pipe to cool the high-pressure gas. Efficiency can be improved, which can also improve the reliability of the device.

[0020]

FIG. 1 shows a power unit according to an embodiment of the present invention . The difference between the embodiment shown in FIG. 1 and FIGS. 6 and 7 showing the prior art is that the high pressure gas in the furnace 4 branches off from the second pipe 9 from the upstream side of the second shutoff valve 6 and the expansion turbine 3, a second bypass pipe 12 for feeding in the middle of the exhaust pipe 16, and a first control valve 13 installed in the middle of the second bypass pipe 12 for controlling the flow rate of the high-pressure gas in the furnace 4. A third bypass pipe 14 branching from a downstream side of the first shutoff valve 5 of the first pipe 8 and sending compressed air to an upstream side of the first control valve 13 of the second bypass pipe 12;
4 and a second control valve 15 for controlling the flow rate of the compressed air. Therefore, the same reference numerals as those in FIGS.

Next, the operation will be described. During normal operation, the first and second shut-off valves 5 and 6 are opened, and the bypass valve 1 is opened.
0 and the first and second control valves 13 and 15 are closed and the compressor 1
Is sent to the furnace 4 through the first shut-off valve 6, high-temperature gas is generated in the furnace 4 and sent to the expansion turbine 2 through the second shut-off valve 6 to rotate the expansion turbine 2. At the same time, the compressor 1 and the generator 3 are rotated.

Next, when a trouble occurs in the power unit, the first and second shut-off valves 5 and 6 are closed and the compressor 1 is turned off.
Further, the expansion turbine 2 and the furnace 4 are shut off. In this state, the bypass valve 10 is opened, and the compressed air from the compressor 1 is sent to the expansion turbine 2 through the bypass valve 10, so that there is no place for the compressed air to go due to the sudden full closure of the compressor 1. . Further, the first control valve 13 is opened, and the high-pressure gas remaining between the furnace 4 and the second shut-off valve 6 in the second pipe 9 passes through the second bypass pipe 12 to the exhaust pipe 16 of the expansion turbine 2. , The pressure in the furnace 4 is reduced. At the same time, the second control valve 15 is opened, and the compressed air remaining between the furnace 4 and the first cutoff valve 5 in the first pipe 8 is sent to the second bypass pipe 12 through the third bypass pipe 14. Therefore, the high-pressure gas passing through the second bypass pipe 12 is cooled by the compressed air, and the cooled high-pressure gas passes through the first control valve 13.
It is discharged to the exhaust pipe 16. Therefore, in the event of an abnormality, the pressure and temperature of the high-pressure gas in the furnace 4 are changed from a state in which the high-temperature and high-pressure gas is held in the furnace 4 to a state in which the high-temperature and high-pressure gas can be restarted. Control can be performed safely and without impairing the reliability of other devices.

Next, a power unit according to another embodiment of the present invention and a dust removing device used in the power unit will be described with reference to FIGS. The difference between the embodiment shown in FIG. 2 and the embodiment shown in FIG.
Is a point that a dust removing device 17 is provided between the furnace 4 and the branch point of the second bypass pipe 12.
The same reference numerals are used, and the description will be made focusing on the dust removing device 17. As shown in FIG. 3, the dust removing device 17 is a filter 2 having a cylindrical shape formed of ceramic in a hopper 18 and having a large number of holes 19 through which high-pressure gas passes.
When a high-pressure gas containing dust is supplied from a gas inlet 21 connected to the upper second pipe 9, the high-pressure gas is separated from the dust while passing through the plurality of filters 20, and the holes 19 are formed. The gas is discharged from the gas discharge port 22 connected to the second pipe 9. Dust separated from high-pressure gas is
After dropping downward and accumulating at the bottom, the dust outlet 2
It is discharged from 3. The gas inlet 21 and the gas outlet 22 are connected to the second pipe 9, and the dust outlet 23
Is connected to a dust discharge device (not shown).

Next, the operation will be described. During normal operation, the first and second shut-off valves 5 and 6 are opened and the bypass valve 10 is opened.
And the first and second control valves 13 and 15 are closed,
The high-pressure gas containing dust from the furnace 4 is sent to the dust removing device 17 through the second pipe 9. The dust removing device 17 separates the high-pressure gas from the dust, and supplies the high-pressure gas to the gas outlet 2.
2 to the expansion turbine 2 through the second pipe 9. On the other hand, the dust separated from the high-pressure gas is discharged outside through the dust discharge port 23. Therefore, during normal operation, it is possible to prevent blades and the like in the expansion turbine 2 from being damaged by dust. When a trouble occurs in the power unit, the first and second shutoff valves 5 and 6 are closed, and the bypass valve 10 and the first and second control valves 13 and 15 are opened. The high-pressure gas contained is sent to the dust removal device 17 through the second pipe 9, separated from dust, and discharged from the expansion turbine 2 through the second pipe 9 and the second bypass 12 through the gas outlet 23. It is sent to tube 16. On the other hand, dust separated from the high-pressure gas is discharged outside through the dust discharge port 23. Therefore, when an abnormality occurs, it is possible to prevent the device connected to the exhaust pipe 16 of the expansion turbine 2 from being damaged by dust.

FIGS. 4 and 5 show a power unit and a dust removing unit according to still another embodiment of the present invention .
Will be described. The only difference between the embodiment shown in FIG. 4 and the embodiment shown in FIG. 2 is that the configuration of the dust removal device 24 is different from the dust removal device 17 shown in FIG. Since the other components are the same, they will be denoted by the same reference numerals, and the description will be made focusing on the dust removing device 24. As shown in FIG. 5, the dust removing device 24 is provided with two hoppers 25 and 26 that are connected vertically. Upper hopper 25
3, a plurality of filters 28 each having a cylindrical shape formed of ceramic and having a hole 27 through which high-pressure gas passes are provided on the outer periphery, and a second pipe 9 is provided above the hopper 18 shown in FIG. , A first gas outlet 22 connected to the second pipe 9 on the side, and a first dust outlet 31 for discharging dust containing a part of high-pressure gas below. Are provided. The lower hopper 26 is provided with a dust inlet 32 connected to the first dust outlet 31 above, a second gas outlet 33 connected to the second bypass pipe 12 diagonally above, and a second gas outlet 33 below. A dust outlet 34 is provided. Next, the operation of the dust removing device 24 will be described. When high-pressure gas containing dust is supplied from the gas inlet 29, the high-pressure gas and dust are separated by the filter 28, and the high-pressure gas is supplied from the first gas outlet 31 to the second pipe 9.
Sent to On the other hand, the dust cannot be completely separated from the variable-pressure gas by the filter 28 and contains a part of the high-pressure gas. Therefore, the dust is discharged together with a part of the high-pressure gas into the lower first dust outlet 31 and the lower dust inlet 3.
2 and falls into the lower hopper 26. At this time,
Part of the high-pressure gas is separated from the dust, and sent to the second bypass pipe 12 from the second gas outlet 33 obliquely above. On the other hand, the dust from which some high-pressure gas has been separated is discharged to the lower second outlet 3
It is discharged outside from 4.

Therefore, the dust removing device 24 according to the present embodiment
Can improve the efficiency of separating dust from the high-pressure gas sent to the exhaust pipe 16 of the expansion turbine 2, thereby further preventing damage to equipment connected to the exhaust pipe 16.

[0027]

Since the present invention is constructed as described above, it has the following effects.

[0028]

As described above, according to the present invention,
Due to the occurrence, it is installed in each of the first piping and the second piping.
When the first and second shutoff valves are closed, the furnace
Exhaust gas from the expansion turbine through the second bypass pipe.
As it discharges into the trachea, the pressure inside the furnace is quickly and safely increased
Incomplete combustion due to lack of compressed air in the furnace
To prevent the generation of toxic gases such as carbon monoxide
The reliability of the vessel can be improved. Moreover, the first arrangement
The compressed air downstream of the first shut-off valve of the pipe is passed through a third bypass pipe.
The high-pressure gas is sent to the middle of the second bypass pipe through which the high-pressure gas is cooled, so that damage to the device can be prevented and the reliability of the device can be improved.

According to the present invention , the dust contained in the high-pressure gas from the furnace is removed by the dust removal device provided on the upstream side of the second shut-off valve of the second pipe during normal operation. Only gas can be sent to the expansion turbine, and when the first shutoff valve and the second shutoff valve provided in the first pipe and the second pipe are closed due to an abnormality, dust is removed by the dust removing device. Discharging the separated high-pressure gas to the exhaust pipe of the expansion turbine, and sending compressed air downstream of the first shut-off valve of the first pipe through a third bypass pipe to the middle of the second bypass pipe; Since the high-pressure gas is cooled, damage to the equipment can be prevented, and in that respect , the reliability of the equipment can be improved.

Further, according to the present invention , the second pipe
Connect the dust removal device provided on the upstream side of the shut-off valve vertically.
When the high-pressure gas from the furnace is fed into the upper hopper, the dust contained in the high-pressure gas is removed, and the dust and some of the dust contained in the dust are removed. The high-pressure gas is dropped into the lower hopper to separate the high-pressure gas from the dust, and only the high-pressure gas is sent to the second bypass pipe to discharge the dust from below. During normal operation, since the second shut-off valve is open, high-pressure gas separated from dust in the upper hopper can be sent to the expansion turbine to prevent damage to equipment in the expansion turbine. When an abnormality occurs, high-pressure gas separated from dust from the lower hopper is discharged to the exhaust pipe of the expansion turbine,
The compressed air downstream of the first shut-off valve of the pipe is sent through the third bypass pipe branched from the first pipe to the middle of the second bypass pipe to cool the high-pressure gas. Separation efficiency can be improved, and from that point
However, the reliability of the device can be further improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a power unit according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a power unit according to a second embodiment of the present invention.

FIG. 3 is an enlarged sectional view of the dust removing device in FIG.

FIG. 4 is a diagram showing a power unit according to a third embodiment of the present invention.

FIG. 5 is an enlarged sectional view of the dust removing device shown in FIG.

FIG. 6 is a diagram showing a conventional power unit during normal operation.

FIG. 7 is a diagram showing an abnormal operation of a conventional power unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Expansion turbine, 3 ... Generator, 4 ... Furnace, 5 ... 1st shut-off valve, 6 ... 2nd shut-off valve, 8 ... 1st piping, 9 ... 2nd piping, 10 ... Bypass Valve, 11: first bypass pipe, 12: second bypass pipe, 13: first control valve,
14: third bypass pipe, 15: second control valve, 16: exhaust pipe, 17, 24: dust removing device.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Satoshi Sato 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Pref. Hitachi, Ltd. Inside the Hitachi Plant (72) Inventor Junji Shimomura 3-1-1 Sachimachi, Hitachi-shi, Ibaraki No. 1 Hitachi, Ltd. Hitachi Plant (72) Inventor Shuichi Kusunuma 3-2-2, Sachimachi, Hitachi City, Ibaraki Pref. Hitachi Engineering Services Co., Ltd. (56) References JP 1-195928 (JP, A) JP-A-62-178731 (JP, A) JP-A-1-232122 (JP, A) JP-A-5-7941 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) ) F02C 3/28 F02C 6/00 F02C 7/00 F23C 11/02 305 F23C 11/02 310

Claims (4)

(57) [Claims] 1. A furnace for burning a fuel such as coal at a pressure higher than the atmospheric pressure to generate a high-temperature gas, a compressor for supplying compressed air to the furnace, and a high-temperature gas from the furnace.
The expansion that is driven and drives the compressor and generator
Tension turbine and compressed air from the compressor to the furnace
Has a first shut-off valve that shuts off the flow while sending
The first pipe and the high-temperature gas from the furnace
A second shutoff valve that shuts off the flow
A second pipe having the first shut-off valve of the first pipe
Connect the upstream side and the downstream side of the second shut-off valve of the second pipe
In addition, in the power plant including the first bypass pipe having the bypass valve, the first and second shut-off
When the valve is closed, the high-pressure gas from the furnace is
Branching from the upstream side of the second shut-off valve of the pipe
2nd bar which is sent to the exhaust pipe of the
In addition to providing an ipass pipe, the compressed air from the compressor is
The first pipe branches off from the downstream side of the first shutoff valve,
The third sent upstream of the first control valve in the second bypass pipe
A power plant comprising a bypass pipe . 2. A furnace for burning a fuel such as coal at a pressure higher than the atmospheric pressure to generate a high-temperature gas, a compressor for supplying compressed air to the furnace, and a high-temperature gas from the furnace.
The expansion that is driven and drives the compressor and generator
Tension turbine and compressed air from the compressor to the furnace
Has a first shut-off valve that shuts off the flow while sending
The first pipe and the high-temperature gas from the furnace
A second shutoff valve that shuts off the flow
A second pipe having the first shut-off valve of the first pipe
Connect the upstream side and the downstream side of the second shut-off valve of the second pipe
While the power plant that includes a first bypass pipe having a bypass valve, the second barrier of the second pipe
It is located upstream of the valve cutoff and is
Removes the gas and sends the removed high-pressure gas to the second pipe
While the dust removal device is installed, the first and second cutoffs occur when an abnormality occurs.
When the valve is closed, the high pressure gas from the furnace is
Branching from the upstream side of the second shut-off valve of the pipe,
A second vial that feeds the bottle exhaust and has a flow control valve
By installing a pass pipe, the compressed air from the compressor
The first pipe branches from the downstream side of the first shutoff valve, and
Third by sending the first control valve upstream of the 2 bypass tube
A power plant comprising a pass tube . 3. A dust removing device comprising: a hopper;
It is installed in the upper part and the side part, and each
With connecting gas inlet and gas outlet
And a dust outlet at the bottom of the hopper
Multiple filters with multiple holes to allow passage of high pressure gas only
The power plant according to claim 2, further comprising a filter . 4. A fuel such as coal at a pressure higher than the atmospheric pressure.
A furnace for burning gas to generate high-temperature gas, and pressurizing the furnace
Compressor that supplies compressed air and hot gas from the furnace
The expansion that is driven and drives the compressor and generator
Tension turbine and compressed air from the compressor to the furnace
Has a first shut-off valve that shuts off the flow while sending
The first pipe and the high-temperature gas from the furnace
A second shutoff valve that shuts off the flow
A second pipe having the first shut-off valve of the first pipe
Connect the upstream side and the downstream side of the second shut-off valve of the second pipe
And a first bypass pipe having a bypass valve.
A power unit provided with the shut-off valve of the second pipe.
Two that are arranged on the upstream side and are connected in the vertical direction
And the high-pressure gas from the furnace above
Filter from the hopper's gas inlet.
The dust contained in the high-pressure gas
From the first gas outlet on the side to the second pipe.
The gas and some high-pressure gas contained in the dust.
Separates dust and high-pressure gas while dropping to the other hopper
Only the high-pressure gas from the second gas outlet to the second bypass
Dust is discharged into the pipe and the dust is discharged from the lower dust outlet
The dust removal device and the first and second shut-off valves were closed due to an abnormality
When the high pressure gas from which dust from the dust removal device has been removed
From the upstream of the second shut-off valve of the second pipe.
And sent to the exhaust pipe of the expansion turbine, and a flow control valve.
And a compressed air from the compressor,
The first pipe branches off from the downstream side of the first shutoff valve,
The third sent upstream of the first control valve in the second bypass pipe
A power plant comprising a bypass pipe .