JP6554985B2 - Operating method and operating apparatus for pressurized circulating fluidized furnace - Google Patents

Description

  The present invention relates to a method and an apparatus for operating a pressurized circulating fluidized furnace that burns an object to be treated such as sewage sludge, biomass, and municipal waste.

  A pressurized fluidized furnace is known as an incineration facility that focuses on effectively taking out the energy of combustion gas discharged from an incinerator by burning an object to be treated such as sewage sludge, biomass, and municipal waste. The pressurized fluidized furnace is a pressurized fluidized furnace that combusts a workpiece, a turbine that is rotated by combustion gas discharged from the pressurized fluidized furnace, and a turbine that is coaxially fixed to the turbine. It is a system characterized by having a supercharger that houses a compressor that rotates and supplies pressurized air.

  In the pressurized fluidized furnace system, the turbine of the turbocharger is driven by the combustion gas generated when the workpiece is completely burned, and it is necessary for the combustion of the workpiece and the fluidized bed flow by the pressurized air discharged from the compressor. Independent operation that covers all the combustion air is possible. It has been known that the self-sustained operation makes it unnecessary to use a flow blower and an induction fan that have been necessary in the past, and the running cost is reduced (see Patent Document 1).

  On the other hand, a technique using a circulating fluidized furnace as an incineration facility is also known (Patent Document 2). The circulating fluidized furnace comprises a riser that burns a workpiece to be supplied, a hot cyclone that separates a fluid medium (sand) and combustion gas from the riser, a downcomer, and a loop seal. Moreover, in order to make the fluid medium with which the riser was filled, the 1st blower 2 which supplies primary air to a riser bottom part, and the 2nd blower which supplies secondary air to a riser from a position higher than primary air are provided. The advantage of using a circulating fluidized furnace is that there is no or little freeboard combustion compared to a bubble fluidized furnace, and therefore stable combustion is obtained, combustion efficiency is high, and equipment is compact. However, it is necessary to raise the fluid sand in the riser at a superficial velocity equal to or higher than the terminal velocity, which may require a fluid blower for secondary air.

JP 2005-28251 A JP 2002-286216 A

  Then, the main subject of this invention is to construct | assemble the system which brings a further advantage, utilizing the advantage which each furnace has by utilizing a circulating flow furnace as a pressurized flow furnace.

The present invention that has solved the above problems is as follows.
A riser that combusts the workpiece to be supplied; and a cyclone that receives the fluid medium and the combustion gas from the riser via a connecting path and separates them, and the separated fluid medium is disposed in the lower part of the riser. In the circulating fluidized furnace configured to return and discharge the combustion gas,
A turbocharger having a turbine that is rotated using combustion gas discharged from the fluidized furnace as a drive source, and a compressor that is rotated as the turbine rotates to generate pressurized air:
A supply path for supplying compressed air generated by the compressor as primary air for flowing the fluid medium in the riser and secondary air supplied into the riser from a position above the primary air;
Temperature detecting means including: temperature detecting means for detecting an internal temperature of the riser; and temperature detecting means for detecting an internal temperature of at least one of the connection path and the cyclone outlet.
An air amount control means for adjusting at least the primary air amount of the primary air amount and the secondary air amount based on temperature signals from these temperature detecting means;
A method of operating a pressurized circulating fluidized furnace comprising:

(Function and effect)
A riser that combusts the workpiece to be supplied; and a cyclone that receives the fluid medium and the combustion gas from the riser via a connecting path and separates them, and the separated fluid medium is disposed in the lower part of the riser. A circulating fluidized furnace is used in which the combustion gas is discharged.
By using such a circulating fluidized furnace, there is no or little free board combustion for the object to be supplied, so that stable combustion can be achieved mainly with a riser.
Furthermore, in the present invention, a turbocharger having a turbine that is rotated by using combustion gas discharged from a fluidized furnace as a drive source, and a compressor that is rotated in accordance with the rotation of the turbine and generates pressurized air; By the structure which has the supply path which supplies the compressed air generated by the compressor as primary air which flows the fluid medium of the riser of a fluidized furnace, and secondary air supplied in a riser from a position above primary air In addition, sufficient fluidization of the fluid medium (fluid sand) and combustion treatment can be achieved.
If the viewpoint is changed, the turbocharger turbine is driven by the combustion gas generated when the workpiece is completely burned, and it is necessary for the burning of the workpiece and the flow of the fluid medium by the pressurized air discharged from the compressor. Independent operation that covers all the combustion air is possible. Since the self-sustained operation is possible, the conventionally required fluid blower and induction fan are not required, and the running cost is reduced. Furthermore, the pressure of the generated pressurized air is sufficiently high, and it is possible to supply the entire amount of primary air that requires a higher pressure than the secondary air.
Temperature detection means including temperature detection means for detecting an internal temperature of the riser and temperature detection means for detecting an internal temperature of at least one of the connection path and the cyclone outlet.
Furthermore, it has air amount control means for adjusting at least the primary air amount of the primary air amount and the secondary air amount based on temperature signals from these temperature detecting means.
As a result, combustion can be stabilized by adjusting at least the primary air amount of the primary air amount and the secondary air amount based on the temperature signal by the temperature detecting means.
In the present invention, in addition to temperature detection with the riser (one or more in the height direction), in particular, at least one of the connection path and the cyclone outlet, temperature detection is performed to detect the primary air amount and the secondary air amount. Of these, adjust the primary air flow at least.
In the present invention, if necessary, a circulating fluidized furnace and a supercharger are combined so that a flow / attracting blower is not required, and combustion is performed at an appropriate temperature by adjusting the amount of air.

A method of operating a pressurized circulating fluidized furnace, wherein the primary air is varied in a range of 10% to 100% of the total air amount, which is the sum of primary air and secondary air, by the air amount control means.

(Function and effect)
By changing the flow rate in the range of 10% to 100% of the total air amount, which is the sum of primary air and secondary air, the flow state of the fluid medium and the combustion of the workpiece can be made appropriate.
In the conventional circulating flow furnace, the flow rate of air that can be supplied to the primary air out of the total flow rate of combustion air supplied into the furnace is limited by the capacity of the flow blower. This is because the primary air is supplied into the fluidized bed of the circulating fluidized furnace, so that a higher supply pressure is required compared to the secondary air. On the other hand, according to the present invention, since the pressure of the pressurized air discharged from the compressor is sufficiently high, the proportion of primary air in the total combustion air flow rate can be freely changed even after the construction of the facility.

A method for operating a pressurized circulating fluidized furnace in which a superficial velocity in the riser is set to 3.0 to 6.0 m / sec by controlling the primary air amount.

(Function and effect)
By slowing the superficial velocity in the riser, it is possible to achieve stable combustion of the workpiece.

The circulating fluidized furnace has a seal pot for temporarily storing the fluid medium in the middle of a path for returning the fluid medium separated by a cyclone to the lower portion of the riser. An operation method of a pressurized circulating fluidized furnace having fluidized air supply means so as to return to the lower part of the riser.

(Function and effect)
The fluidized medium separated in a cyclone in the middle of the path to return back to the riser bottom, providing a seal pot for temporarily storing the fluid medium, it can be prevented blow from the riser bottom to the cyclone. In order to cause the stored fluid medium to flow and return to the lower part of the riser, the amount of fluid medium returned can be controlled.

The circulating flow reactor, the fluidized medium separated, the seal pot is returned continuously without a path back to the riser bottom, the path downward back, a configuration in which a fluidizing air supply means under pressure circulates How to operate a fluidized furnace.

(Function and effect)
The fluid medium separated by the cyclone can be returned continuously without a seal pot in the path returning to the lower part of the riser. In this case, even if a seal pot is not provided in the lower part of the return path, it is necessary for the fluid medium to be present at the required density in the lower part of the return path in order to prevent blow-through from the lower part of the riser to the cyclone. Fluidized air facilitates movement of the fluid medium in the return path .

Desulfurizing agent operating method of Bei obtaining pressurized circulating fluidized furnace supply means for supplying a desulfurizing agent within the riser.

(Function and effect)
It is desirable to remove as much sulfur as possible from the combustion gas. Therefore, it is possible to remove sulfur by supplying a desulfurizing agent into the riser. The greatest advantage of introducing the desulfurizing agent into the circulating fluidized furnace is that the desulfurizing agent is also circulated, so that the amount of unreacted desulfurizing agent is reduced and the amount of desulfurizing agent used per hour is sufficient.

The method of operating a pressurized circulating fluidized furnace for supplying into said riser by the desulfurizing agent supply means said desulfurizing agent in a slurry state.

(Function and effect)
The desulfurizing agent (a representative example of which is limestone) may be supplied as, for example, 10 to 500 μm particles. However, there is a possibility that unreacted desulfurizing agent (particularly small-diameter desulfurizing agent) may be discharged out of the circulating fluidized furnace. On the other hand, if it is excessively large, the total specific surface area per supply amount does not increase, resulting in a problem of poor reaction efficiency. Furthermore, in the particle form, it is difficult to strictly adjust the supply amount to the circulating fluidized furnace. Moreover, as a fundamental problem, in the present invention, the inside of the riser is in a pressurized state, which makes it difficult to supply the particle form. On the other hand, all the above-mentioned problems can be solved by supplying the desulfurizing agent into the riser by the desulfurizing agent supplying means in a slurry state.

The circulating fluid furnace is configured so that the separated fluid medium is continuously returned without a seal pot in a path for returning to the lower part of the riser,
After passing the combustion gas discharged from the cyclone through an air preheater, the dust is collected by the dust collector, the air removed by the dust collector is supplied to the turbine of the supercharger, and the compressed air generated by the compressor After passing a part through the air preheater, it is used as primary air and secondary air,
The remainder of the pressurized air, not through the air preheater, direct method of supplying the operating pressure circulating fluidized furnace for the fluidizing air supply means provided in the return path.

(Function and effect)
As the pressurized air supplied to the fluidized air blowing means provided in the return path , if the temperature is high, there is a problem in handling, etc., so the compressed air generated by the compressor is not directly passed through the air preheater. This is desirable because it is supplied.

A riser that combusts the workpiece to be supplied; and a cyclone that receives the fluid medium and the combustion gas from the riser via a connecting path and separates them, and the separated fluid medium is disposed in the lower part of the riser. In the circulating fluidized furnace configured to return and discharge the combustion gas,
A turbocharger having a turbine that is rotated by using combustion gas discharged from the fluidized furnace as a drive source, and a compressor that is rotated as the turbine rotates to generate pressurized air;
A supply path for supplying the pressurized air generated by the compressor to the riser of the fluid furnace as primary air and secondary air;
Temperature detection means for detecting the internal temperature of the riser and at least one of the connection path and the cyclone outlet;
An air amount control means for adjusting the primary air amount and the secondary air amount based on a temperature signal from the temperature detecting means;
An apparatus for operating a pressurized circulating fluidized furnace, comprising:

  According to the above invention, by using the circulating fluidized furnace as a pressurized fluidized furnace, the above-described further advantages are exhibited while taking advantage of the advantages of each of the furnaces.

It is an outline explanatory view of a 1st embodiment of the present invention. It is outline | summary explanatory drawing of the 2nd Embodiment of this invention.

  Hereinafter, this embodiment of the present invention will be described in detail with reference to the accompanying drawings.

<First Embodiment>
The circulating fluidized furnace 1 includes a riser 2 that burns a workpiece to be supplied, and a fluid medium (sand) and combustion gas from the riser 2 that are received via a connection path 3 to separate them (hot) cyclone 4. The separated fluid medium is returned to the lower portion of the riser 2 through the inclined return path 5, and the combustion gas is discharged from the top of the cyclone 4.
A primary air supply port for mainly flowing a fluid medium is provided at the bottom of the riser 2, and a secondary air supply port is provided above the primary air intake port.

  Further, a turbine 30a that is rotated by using the combustion gas discharged from the fluidized furnace 1 as a drive source, and a compressor 30b that is rotated along with the rotation of the turbine 30a and takes in the outside air A to generate pressurized air. The supercharger 30 is included.

  Furthermore, supply passages 31, 32, for supplying pressurized air obtained by increasing the pressure of the air sucked by the compressor 30 b to, for example, 0.05 to 0.3 MPa to the riser 2 of the fluidized furnace 1 as primary air and secondary air. 33, 34A, 34B, temperature detecting means 60, 60, 61, 62 for detecting the internal temperature of the riser 2, at least one of the connecting path 3 and the cyclone 4 outlet, and temperature detecting means 60, 60, , 61, 62 based on the temperature signal, air amount control means 34a, 34b for adjusting the primary air amount and the secondary air amount are provided.

  The combustion gas discharged from the top of the cyclone 4 is guided to the air preheater 10 through the conduit 6 so as to preheat the pressurized air introduced through the connection passages 31 and 32 generated by the compressor 30b. It has become. As the air preheater 10, a shell and tube heat exchanger or the like can be used.

The combustion gas after passing through the air preheater 10 is supplied to the dust collector 20 through the conduit 7 and is contained in the combustion gas sent from the air-air preheater 10, such as dust, finely divided fluidized sand, etc. Remove impurities. The trapped impurities D are discharged out of the system through the discharge path 9.
As a filter installed in the dust collector 20, for example, a ceramic filter can be used. In the dust collector 20, a supply port for supplying combustion gas into the apparatus is formed in the lower portion of the lower side wall, and in the upper portion, An exhaust port is formed for discharging clean combustion gas from which impurities and the like have been removed to the outside of the device.

(Supercharger)
The supercharger 30 is provided in the subsequent stage of the dust collector 20, receives the combustion gas sent from the dust collector 20 through the pipe line 8, and is rotated by this, and the rotation of the turbine 30a. And a compressor 30b which is fixed coaxially with the turbine and transmits the rotation by the shaft 30c to generate pressurized air. The generated pressurized air is supplied to the pressurized fluidized furnace 1 as combustion air.

  A part of the combustion gas passing through the pipe line 8 is directly guided to the exhaust means 40 such as a chimney through the flow rate adjusting valve 9a and released to the atmosphere. In addition, on the upstream side of the exhaust means 40, a smoke exhausting means (not shown) for removing sulfur and the like in the combustion gas is provided.

(Operation example)
An object to be treated such as sewage sludge, biomass, and municipal waste is cut out from the temporary storage device 70 and supplied from the middle stage of the riser 2 to the inside. The supplied workpiece is combusted while rising as the fluid medium (sand) in the riser 2 rises, and is transferred from the upper portion of the riser 2 to the cyclone 4 via the connecting path 3.
In the cyclone 4, the combustion gas and the fluidized medium are separated, and the combustion gas is guided to the air preheater 10 as the combustion gas.
The fluid medium separated by the cyclone 4 moves to the lower part thereof, and is returned to the lower part of the riser 2 through the inclined return path 5.

  As described above, the compressed air generated by the compressor 30b passes through the supply passages 31, 32, 33, 34A, and 34B, and passes through the air preheater 10 to the riser 2 of the fluidized furnace 1 to generate primary air and secondary air. Supply as air.

Temperature detection means 60, 61, 62 for detecting the internal temperature of the riser 2 and at least one (both in the illustrated embodiment) of the connecting path 3 and the cyclone 4 outlet are provided. These temperature detection means 60, 61, Based on the temperature signal 62, the arithmetic processing unit 36 provides flow rate signals to the air amount control means 34a, 34b for adjusting the primary air amount and the secondary air amount.
The signal processing form in this case is not limited, but preferably the detected temperatures of the temperature detecting means 60, 61, 62 from the secondary air blowing site to the cyclone 4 outlet are substantially the same (15 ° C. (Temperature difference within a range) is desirable.
The primary air amount can be varied in the range of 10% to 100% of the total air amount, which is the sum of primary air and secondary air.
It is desirable that the superficial velocity in the riser 2 is set to 3.0 to 6.0 m / sec by controlling the primary air amount.
These control the total amount of primary air, secondary air, or the sum of these from the viewpoint of increasing the residence time in the riser 2 and slowing the superficial velocity in order to achieve complete combustion. Can do.

In addition to primary air and secondary air, a tertiary air blowing path 34C may be provided. It is desirable that the primary air is blown from the lower portion of the riser 2 and the lowest temperature detecting means 60 is provided above the primary air. The upper surface of the fluidized bed of the fluidized medium is preferably set to a level at which the lower part of the return path 5 is submerged.
And it is desirable to blow in secondary air from above the upper surface of the fluidized bed through the secondary air blowing path 34B.

  On the other hand, a desulfurizing agent supply means for supplying a desulfurizing agent X (limestone, slaked lime, dolomite, etc.) into the riser 2 is provided. In the example of FIG. 1, the desulfurizing agent X is dissolved in the dissolution tank 52 and is supplied into the riser 2 by the pump 53 as a slurry. On the other hand, as shown in FIG. 2, the granular desulfurizing agent X may be cut out from the temporary reservoir 50 and supplied by the feeder 51.

  By adding the desulfurizing agent X, sulfur contained in the exhaust gas is removed as much as possible. The amount of desulfurizing agent X added is the amount of desulfurizing agent X for removing sulfur content by measuring the sulfur content of the object to be treated and measuring the concentration of sulfur in the exhaust gas discharged from the chimney 40 into the atmosphere. The desulfurizing agent X can be continuously supplied into the riser 2.

When the desulfurizing agent is granular, it is desirable that the desulfurizing agent be 10 to 500 μm, for example. If it is too small, there is a possibility that unreacted desulfurizing agent may be discharged out of the circulating fluidizing furnace, and if it is too large, the total specific surface area per supply amount does not increase, resulting in poor reaction efficiency.
If the desulfurizing agent is supplied into the riser 2 by the desulfurizing agent supply means in a slurry state, all the problems can be solved, which is an optimum form.

  As other desulfurizing agent X supply methods, a powdery desulfurizing agent is supplied into the furnace by pneumatic transportation, or sludge and desulfurizing agent X are mixed in a mixer (not shown) and then supplied into the furnace. You can also The mixer may be provided upstream or downstream of the temporary storage device 70, and the temporary storage device 70 may be used as a mixer.

Some of the pressurized air, as shown in FIG. 1, as the assist air 35B for promoting the flow of purge air 35A and return path 5 near the outlet to promote movement of the fluidized medium in the path 5 to return Can be used.
In this case, since heating with the air preheater 10 causes a reduction in handling properties, it is desirable to supply the air through the bypass path 35 while avoiding the air preheater 10.

<Second Embodiment>
As shown in FIG. 2, the circulating fluid furnace 1 is provided with a seal pot 80 for temporarily storing the fluid medium in the middle of a path 5 for returning the fluid medium separated by the cyclone 4 to the lower part of the riser 2. 80, fluidized air supply means 81 can be provided to flow the stored fluid medium and return it to the lower part of the riser 2.

If a seal pot 80 for temporarily storing the fluid medium is provided in the middle of the path 5 for returning the fluid medium separated by the cyclone 4 to the lower part of the riser 2, it is possible to prevent blow-through from the lower part of the riser 2 to the cyclone 4. However, since the temporarily stored fluid medium needs to be circulated back to the lower portion of the riser 2, fluidized air supply means 81 can be provided.
In this second embodiment, as the air blown from the fluidized air supply means 81, a compressed air generated by the compressor 30b can be used instead of preparing a separate blower.

DESCRIPTION OF SYMBOLS 1 Circulation flow furnace 2 Riser 3 Connection path 4 Cyclone 5 return path 10 Air preheater 20 Dust collector 30 Supercharger 30a Turbine 30b Compressor 34A Primary air supply path 34B Secondary air supply path 34C Tertiary air supply path 60 Temperature detection means 61 Temperature detection means
62 Temperature detection means 80 Seal pot X Desulfurization agent

Claims (8)

A riser that combusts the workpiece to be supplied; and a cyclone that receives the fluid medium and the combustion gas from the riser via a connecting path and separates them, and the separated fluid medium is disposed in the lower part of the riser. In the circulating fluidized furnace configured to return through the return path and discharge the combustion gas,
An air preheater for passing the combustion gas discharged from the cyclone;
A dust collector for removing dust from the combustion gas after passing through the air preheater :
A turbocharger that is provided at a subsequent stage of the dust collector and is rotated by using a combustion gas delivered from the dust collector as a drive source, and a compressor that is rotated as the turbine rotates to generate pressurized air. With the machine:
Pressurized air of 0.05 to 0.3 MPa generated by the compressor is supplied as primary air for flowing the fluid medium in the riser and secondary air supplied into the riser from a position above the primary air. Supply path to:
A purge air supply means for promoting the movement of the fluid medium provided in the return path, wherein the return path has no seal pot and is continuously returned.
Temperature detecting means including: temperature detecting means for detecting an internal temperature of the riser; and temperature detecting means for detecting an internal temperature of at least one of the connection path and the cyclone outlet.
Air amount control means for adjusting at least the primary air amount of the primary air amount and the secondary air amount based on temperature signals from these temperature detecting means ,
A portion of the compressed air generated by the compressor is used as the primary air and the secondary air after passing through the air preheater,
The remainder of the pressurized air is supplied directly to the purge air supply means provided in the return path without passing through the air preheater.
A method for operating a pressurized circulating fluidized furnace. A riser that combusts the workpiece to be supplied; and a cyclone that receives the fluid medium and the combustion gas from the riser via a connecting path and separates them, and the separated fluid medium is disposed in the lower part of the riser. In the circulating fluidized furnace configured to return through the return path and discharge the combustion gas,
An air preheater for passing the combustion gas discharged from the cyclone;
A dust collector for removing dust from the combustion gas after passing through the air preheater:
A turbocharger that is provided at a subsequent stage of the dust collector and is rotated by using a combustion gas delivered from the dust collector as a drive source, and a compressor that is rotated as the turbine rotates to generate pressurized air. With the machine:
Pressurized air of 0.05 to 0.3 MPa generated by the compressor is supplied as primary air for flowing the fluid medium in the riser and secondary air supplied into the riser from a position above the primary air. Supply path to:
A seal pot for temporarily storing a fluid medium provided in the return path;
Fluidized air supply means for flowing the fluid medium stored in the seal pot;
Temperature detecting means including: temperature detecting means for detecting an internal temperature of the riser; and temperature detecting means for detecting an internal temperature of at least one of the connection path and the cyclone outlet.
Air amount control means for adjusting at least the primary air amount of the primary air amount and the secondary air amount based on temperature signals from these temperature detecting means ,
A portion of the compressed air generated by the compressor is used as the primary air and the secondary air after passing through the air preheater,
The remainder of the pressurized air is supplied directly to the fluidized air supply means provided in the return path without passing through the air preheater.
A method for operating a pressurized circulating fluidized furnace. 3. The pressurized circulating fluidized furnace according to claim 1, wherein the primary air is varied in a range of 10% to 100% of a total air amount that is a sum of primary air and secondary air by the air amount control means. how to drive. The operating method of the pressurized circulation flow furnace of Claim 1 or 2 which makes the superficial velocity in the said riser 3.0-6.0m / sec by control of the said primary air quantity. The operating method of the pressurized circulation flow furnace of any one of Claims 1-4 provided with the desulfurization agent supply means which supplies a desulfurization agent in the said riser. 6. A method for operating a pressurized circulating fluidized furnace according to claim 5 , wherein the desulfurizing agent is supplied into the riser by the desulfurizing agent supply means in a slurry state. A riser that combusts the workpiece to be supplied; and a cyclone that receives the fluid medium and the combustion gas from the riser via a connecting path and separates them, and the separated fluid medium is disposed in the lower part of the riser. In the circulating fluidized furnace configured to return through the return path and discharge the combustion gas,
An air preheater for passing the combustion gas discharged from the cyclone;
A dust collector for removing dust from the combustion gas after passing through the air preheater:
A turbocharger that is provided at a subsequent stage of the dust collector and is rotated by using a combustion gas delivered from the dust collector as a drive source, and a compressor that is rotated as the turbine rotates to generate pressurized air. With the machine:
Pressurized air of 0.05 to 0.3 MPa generated by the compressor is supplied as primary air for flowing the fluid medium in the riser and secondary air supplied into the riser from a position above the primary air. Supply path to:
A purge air supply means for promoting the movement of the fluid medium provided in the return path, wherein the return path has no seal pot and is continuously returned.
Temperature detecting means including: temperature detecting means for detecting an internal temperature of the riser; and temperature detecting means for detecting an internal temperature of at least one of the connection path and the cyclone outlet.
Air amount control means for adjusting at least the primary air amount of the primary air amount and the secondary air amount based on temperature signals from these temperature detecting means ,
Means for using a portion of the compressed air generated by the compressor as the primary air and the secondary air after passing through the air preheater;
The remaining portion of the pressurized air has means for directly supplying the purge air supply means provided in the return path without passing through the air preheater,
An apparatus for operating a pressurized circulating fluidized furnace. A riser that combusts the workpiece to be supplied; and a cyclone that receives the fluid medium and the combustion gas from the riser via a connecting path and separates them, and the separated fluid medium is disposed in the lower part of the riser. In the circulating fluidized furnace configured to return through the return path and discharge the combustion gas,
An air preheater for passing the combustion gas discharged from the cyclone;
A dust collector for removing dust from the combustion gas after passing through the air preheater:
A turbocharger that is provided at a subsequent stage of the dust collector and is rotated by using a combustion gas delivered from the dust collector as a drive source, and a compressor that is rotated as the turbine rotates to generate pressurized air. With the machine:
Pressurized air of 0.05 to 0.3 MPa generated by the compressor is supplied as primary air for flowing the fluid medium in the riser and secondary air supplied into the riser from a position above the primary air. Supply path to:
A seal pot for temporarily storing a fluid medium provided in the return path;
Fluidized air supply means for flowing the fluid medium stored in the seal pot;
Temperature detecting means including: temperature detecting means for detecting an internal temperature of the riser; and temperature detecting means for detecting an internal temperature of at least one of the connection path and the cyclone outlet.
Air amount control means for adjusting at least the primary air amount of the primary air amount and the secondary air amount based on temperature signals from these temperature detecting means ,
Means for using a portion of the compressed air generated by the compressor as the primary air and the secondary air after passing through the air preheater;
The remainder of the compressed air has means for supplying directly to fluidized air supply means provided in the return path without passing through the air preheater,
An apparatus for operating a pressurized circulating fluidized furnace.

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