JP5518938B2 - Method of conveying fluid medium in pressurized fluidized furnace system - Google Patents

Description

  The present invention relates to a dust collection and discharge method for a pressurized fluidized furnace system for burning an object to be treated such as sewage sludge, biomass, municipal waste, and industrial waste, and more specifically, a pressurized fluidized furnace and a supercharger. The present invention relates to a transport method for efficiently transporting impurities, such as dust contained in combustion exhaust gas and finely divided fluidized sand, collected by a dust collector disposed between the machines to the outside of the machine.

2. Description of the Related Art Conventionally, a pressurized fluidized furnace system is known as an incineration facility that effectively burns an object to be treated such as sewage sludge, biomass, and municipal waste and effectively uses the energy of combustion exhaust gas discharged from the incinerator.
The pressurized fluidized furnace system rotates with the rotation of a pressurized fluidized furnace having a fluidized bed for burning an object to be processed, a turbine that is rotated by combustion exhaust gas discharged from the pressurized fluidized furnace, and the turbine. It consists of a turbocharger with a compressor that supplies combustion air necessary for combustion to the pressurized fluidized furnace.
In the pressurized fluidized moving furnace system, since all the combustion air necessary for combustion of the workpiece is supplied from the supercharger to the pressurized fluidized furnace for self-sustained operation, a fluidized blower and an induction fan are no longer required. It is known that costs can be reduced.
A conveying device that conveys sand as a fluidized medium to a fluidized bed furnace is disclosed. The conveying device includes a normal pressure tank for storing sand, a pressurized tank capable of raising and lowering the internal pressure, and a fluidized bed furnace, and the normal pressure tank and the pressurized tank, and the pressurized tank and the pressurized tank are respectively controlled by valves. It is connected.
When sand falls freely from the pressurized tank to the fluidized bed furnace, the valve between the pressurized tank and the fluidized bed furnace is connected to the fluidized bed furnace without increasing the pressure of the pressurized tank, and the sand is transferred from the pressurized tank to the fluidized bed furnace. On the other hand, if the internal pressure of the fluidized bed furnace is high and sand does not fall freely from the pressurized tank to the fluidized bed furnace, the valve between the pressurized tank and the fluidized bed furnace is communicated after the pressurized tank is pressurized. The sand is transported from the pressurized tank to the fluidized bed furnace. (Patent Document 1)

JP 59-156423 A

  However, if the pressurized fluidized furnace and the pressurized tank having a higher internal pressure than the pressurized fluidized furnace are connected, the internal pressure of the pressurized fluidized furnace may fluctuate and the combustion efficiency of the high pressurized fluidized furnace may not be maintained. Further, the inner surface of the pressurized tank may be corroded by the combustion exhaust gas of the pressurized fluidized furnace flowing into the pressurized tank. Furthermore, there is a risk that sand during conveyance, dust in a pressurized fluidized furnace, etc. will adhere to the seal portion, drive portion, etc. of the valve and cause the valve to malfunction early.

  Therefore, the main problem of the present invention is to eliminate such problems.

The present invention and effects obtained by solving the above problems are as follows.
The first invention is a pressurized flow furnace for burning a workpiece, an upper valve disposed between a tank and an upper supply device that conveys a fluid medium to the pressurized flow furnace, and a lower flow of the tank In a method of conveying a fluid medium in a pressurized fluidized furnace system comprising a conveying device having a lower stage valve disposed between a lower supply device that conveys a medium and the pressurized fluidized furnace,
The pressure in the tank is reduced, the upper valve is driven to communicate the upper supply device with the tank, the upper supply device is driven to transport the fluid medium to the tank, and then the upper valve is driven to A pre-stage process in which the supply device and the tank are not in communication;
The pressure in the tank is increased, the lower valve is driven to connect the tank and the pressurized fluidized furnace, the lower supply device is driven to transport the fluid medium to the pressurized fluidized furnace, and then the lower valve is after repeated one or more times also reduce the transfer step comprising a drive to the tank and the pressurized flow reactor and a subsequent step of the non-communicating,
Have a waiting step of maintaining the state of being boosted pressure in the tank,
During the transfer of the fluid medium from the upper supply device to the tank, the cleaning gas is supplied to the upper valve, and during the transfer of the fluid medium from the tank to the pressurized fluidized furnace, the cleaning gas is supplied to the lower valve.
It is characterized by that .

(Function and effect)
Since the pressure in the tank is reduced and the upper supply device is driven to transport the fluid medium to the tank, the fluid medium can be efficiently transported from the outside to the tank. Further, since the pressure in the tank is increased and the lower supply device is driven to transport the fluid medium to the pressurized fluidized furnace, the internal pressure of the tank is made substantially equal to the internal pressure of the pressurized fluidized furnace and applied during transportation of the fluidized medium. The fluctuation of the pressure in the pressure fluidized furnace can be reduced. Furthermore, since the pressure in the tank is maintained in a pressurized state after the transfer of the fluid medium, the backflow of the combustion exhaust gas generated in the pressurized fluidized furnace is prevented in the tank and the humus on the inner surface of the tank is suppressed. Can do.
The cleaning gas is supplied to the upper valve during the transfer of the fluid medium from the upper supply device to the tank, and the cleaning gas is supplied to the lower valve during the transfer of the fluid medium from the tank to the pressurized fluidized furnace. The fluid medium adhering to and mixed in the valve body and the seal portion is removed, the malfunction of the upper / lower valve due to the fluid medium is prevented, and the maintenance / inspection frequency of the upper / lower valve can be reduced.

The second invention is, in the configuration of the first invention, characterized by boosting the pressure in the tank to 0 to 0.01 P a higher pressure than the pressurized fluid Douro.

(Function and effect)
Since boosts the pressure in the tank to 0 to 0.01 P a higher pressure than the pressurized fluid Douro, it is possible to further reduce variations in the pressure of the pressurized flow furnace during conveying of the flow medium, the inner surface of the tank Humus can be further suppressed.

The third invention is characterized in that, in the configuration of the first or second invention, the deterioration state of the upper and lower valves is detected by pressure measuring means provided in a tank.

(Function and effect)
Since the deterioration status of the upper and lower valves is detected by the pressure measurement means provided in the tank, the deterioration status of the upper and lower valves can be accurately grasped, and a planned maintenance and replacement work plan can be made. .

A fourth invention is characterized in that, in the configuration of the first or second invention, the fluid medium is a mixture of an unused fluid medium and a used fluid medium.

(Function and effect)
Since the fluidized medium is a mixture of an unused fluidized medium and a used fluidized medium, the fluidized medium having a predetermined particle size interposed in the impurities carried out from the pressurized fluidized furnace can be reused, and the running cost can be reduced. Can be reduced.

According to a fifth aspect of the present invention, there is provided a pressurized fluidizing furnace for combusting an object to be processed, an upper valve disposed between a tank and an upper supply device for transporting a fluid medium to the pressurized fluidizing furnace, and a cleaning gas in the upper valve. A first cleaning device for supplying a fluid, a lower supply device for transporting a fluid medium below the tank, a lower valve disposed between the pressurized fluidized furnace, and a first gas for supplying a cleaning gas to the lower valve . In a pressurized flow furnace system provided with a transfer device provided with two cleaning devices ,
The tank includes an intake / exhaust device for raising and lowering the pressure in the tank,
During pressure reduction in the tank, the upper valve is used to switch between communication and non-communication between the upper supply device and the tank,
During the transfer of the fluid medium from the upper supply device to the tank, the cleaning gas is supplied to the upper valve by the first cleaning device,
During the pressure increase in the tank, the lower valve is used to switch between communication and non-communication between the tank and the pressurized fluidized furnace .
During transport of the pressurized flow reactor in the fluidized medium from the tank, by the second cleaning device, characterized by comprising the structure for supplying the cleaning gas to the lower valve.

(Function and effect)
While the pressure in the tank is reduced, the upper valve switches the communication state between the upper supply device and the tank, so that the fluid medium can be efficiently conveyed from the outside to the tank. In addition, during the pressure increase in the tank, the communication between the tank and the pressurized fluidized furnace is switched by the lower valve so that the tank internal pressure is substantially equivalent to the internal pressure of the pressurized fluidized furnace when transporting the fluid medium. The fluctuation of the pressure in the pressurized fluidized furnace can be reduced.
Further, since the cleaning gas is supplied to the upper valve while the fluid medium is being transferred from the upper supply device to the tank, and the cleaning gas is supplied to the lower valve while the fluid medium is being transferred from the tank to the pressurized fluidized furnace, The fluid medium adhering to and mixed in the valve body and the seal portion of the valve is removed, the malfunction of the upper / lower valve due to the fluid medium is prevented, and the maintenance / inspection frequency of the upper / lower valve can be reduced.

According to a sixth aspect of the invention, in the configuration of the fifth aspect of the invention, the lower supply device is a screw conveyor.

(Function and effect)
Since the lower supply device is composed of a screw conveyor, it is possible to further reduce the fluctuation of the pressure in the pressurized fluidized furnace when the fluid medium is conveyed.

A seventh aspect of the invention is characterized in that, in the configuration of the sixth aspect of the invention, the upper supply device is a screw conveyor.

(Function and effect)
Since the upper supply device is made up of a screw conveyor, the parts can be shared, and maintenance and inspection can be easily performed.

  According to the above invention, a fluid medium can be conveyed efficiently and the fluctuation of the internal pressure of a pressurization flow furnace can be controlled at the time of conveyance of a fluid medium.

It is explanatory drawing of a pressurized flow furnace system. It is a principal part enlarged view of a supply conveyance apparatus. It is a flowchart of the supply conveyance method of a fluid sand.

  Hereinafter, this embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, in order to make an understanding easy, although it showed and demonstrated the direction for convenience, the structure is not limited by these.

  A pressurized fluidized furnace system 1 is shown in FIG. The system includes a storage device 10 that stores a processing object containing organic matter such as sewage sludge, municipal waste, and industrial waste, a pressurized flow furnace 20 that incinerates the processing object, combustion exhaust gas, and combustion air. An air preheater 40 that performs heat exchange, a dust collector 50 that collects combustion ash, dust, and the like in the combustion exhaust gas, a turbine 61 that is rotated by the combustion exhaust gas, and rotation and pressurization as the turbine 61 rotates. A supercharger 60 that includes a compressor 62 that supplies combustion air to the fluidized furnace 20, a white smoke prevention preheater 70 that heats the white smoke prevention air using combustion exhaust gas discharged from the supercharger 60, and combustion exhaust gas Is provided with a flue gas treatment tower 80 for discharging the air to the outside.

(Storage device)
The storage device 10 stores an object to be processed such as sewage sludge that has been dehydrated to a moisture content of about 65 to 85% by mass.

  A quantitative feeder 11 for supplying a predetermined amount of workpiece to the pressurized fluidized furnace 20 is disposed at the lower part of the storage device 10. At the bottom of the quantitative feeder 11, a charging pump 12 that pumps the workpiece to the pressurized fluidized furnace 20 is disposed. As the input pump 12, a single screw pump, a piston pump or the like can be used.

(Pressurized flow furnace)
The lower part of the pressurized fluidized furnace 20 is filled with solid particles such as sand having a predetermined particle diameter to be a fluidized medium. The pressurized fluidized furnace 20 maintains the fluidized state of a fluidized bed (sand layer) made of solid particles by the supplied combustion air, while the object to be treated supplied from the outside, city gas, heavy oil supplied as needed. Auxiliary fuel such as is burned.

  In the pressurized fluidized furnace 20, an auxiliary fuel combustion device 21 such as an oil gun or a gas gun for heating the sand layer is disposed below the side wall on one side. A starter burner 22 that heats the sand layer at the time of start-up is disposed in the vicinity of the upper side of the auxiliary fuel combustion device 21, and a supply port 13B for the object to be processed is provided in the upper part of the starter burner 22 for supply. A water gun 23 for cooling the combustion exhaust gas is disposed in the vicinity of the upper side of the mouth 13B, and when the temperature of the combustion exhaust gas rises to a predetermined temperature or higher, cooling water is sprayed into the furnace. In addition, a plurality of temperature sensors (not shown) for measuring the furnace temperature are installed on the side wall in the height direction.

  At the bottom of the pressurized fluidized furnace 20, an extraction / conveying device that conveys fluidized sand and incombustibles to the outside of the furnace is disposed. A combustion air supply pipe 24 for supplying combustion air is disposed, and a supply transport device 106 for transporting new fluidized sand into the pressurized fluidized furnace 20 is disposed in the middle portion, on the narrowed side wall at the top. Is formed with an exhaust port for exhausting exhaust gas and water vapor generated by combustion of an object to be processed, auxiliary fuel, and the like to the outside. In the present specification, exhaust gas and water vapor are collectively referred to as combustion exhaust gas.

Next, the supply conveyance device 106 will be described with reference to FIG. The supply / conveyance device 106 connects the upper supply device 101 that supplies the fluidized sand conveyed by the conveyance conveyor 108 to the tank 103, the tank 103 that stores the fluidized sand, and the upper supply device 101 and the tank 103. An upper valve 102 provided in the pipe is provided.
For the upper supply device 101, a cone valve, a rotary valve, a swing valve damper, a pinch valve, a screw conveyor, or the like can be used, but it is preferable to use a rotary valve. Further, if necessary, an upper tank 101A can be provided above the upper supply device 101, and the fluidized sand transported from the transport conveyor 108 can be temporarily stored. The fluidized sand in the upper tank 101A stores unused fluidized sand and used fluidized sand having a predetermined particle size.

In order to remove impurities adhering to and mixed in the contact portion and drive portion between the valve body and the seat member, the upper stage valve 102 is supplied with cleaning gas such as air in the contact portion and drive portion between the valve body and the seat member. A circulating cleaning device ("first cleaning device" in the claims) 102A is provided. The cleaning device 102A is a device including a pipe and a valve, and is connected to a cleaning gas supply port (not shown) provided in the upper valve 102 by a pipe or a hose. The cleaning device 102 </ b> A is supplied with cleaning compressed gas used for cleaning when the upper valve 102 is operated from each compressed air supply source via a pipe. Pressure of the cleaning compressed air, 0.4~0.5M P a is preferable. The cleaning compressed gas pipe is provided with a valve for controlling the supply, and is controlled by a signal from the control device. This control device can be used as the one attached to the cleaning device 102A or the control device of the pressurized fluidized furnace system 1. As the cleaning gas, it is possible to use a separately provided air compressor, compressed air supplied from the supercharger 60 of the pressure fluidized furnace system 1, or compressed nitrogen supplied separately.

The tank 103 is provided with an intake / exhaust device 103A that raises and lowers the pressure in the tank 103, and a pressure measuring means 103B that detects the pressure.
The intake / exhaust device 103A includes a bag filter 113A that collects dust in the tank 103 during exhaust, and an intake pipe and an exhaust pipe that extend outward. One end of the intake pipe is connected to an air compressor, a supercharger 60, or the like that supplies a gas for pressurization to the tank 103. In particular, the use of compressed air generated by the supercharger 60 as the pressurizing gas is preferable because the tank 103 can be easily pressurized to a pressure slightly higher than that of the pressurized fluidized furnace 20. On the other hand, one end of the exhaust pipe is open to the atmosphere.
The intake pipe is preferably provided at a position where compressed air can be supplied into the tank 103 from the outside of the dust adhering surface of the bag filter 113A. With this configuration, dust adhering to the bag filter 113A is removed during intake. There is an effect of sieving into the tank 103.
The intake pipe is provided with an intake valve 113B, and the exhaust pipe is provided with an exhaust valve 113C. By controlling these valves, the pressure in the tank 103 is raised and lowered. In addition, it is not necessary to connect the intake pipe and the exhaust pipe to each bag filter 113A. The pipe connected to the bag filter 113A is shared, and the other end side of the pipe is branched into two and extended to the intake pipe. It can also be used as an exhaust pipe. With such a configuration, there is only one connection point with the bag filter 113A, and the maintainability is improved.
By observing the pressure in the tank 103 with the pressure measuring means 103B, damage to the upper supply device 101, the upper valve 102, etc. can be predicted.

A lower supply device 104 that conveys fluid sand from the tank 103 to the pressurized fluidized furnace 20 is provided below the tank 103, and a lower valve 105 is provided below the lower supply device 104. For the lower supply device 104, a cone valve, a rotary valve, a swing valve damper, a pinch valve, or a screw conveyor can be used.
Similarly to the upper valve 102, the lower valve 105 has a contact portion and a drive between the valve body and the seat member in order to remove impurities adhering to and mixed in the contact portion and the drive portion between the valve body and the seat member. A cleaning device (a “second cleaning device” in the claims) 105A for circulating cleaning gas inside the valve such as a part is provided. The structure and function of the cleaning device 105A are the same as the cleaning device 102A for the upper valve.

(Air preheater)
The combustion exhaust gas discharged from the pressurized fluidized furnace 20 is supplied to the air preheater 40 installed at the rear stage of the pressurized fluidized furnace 20 via the path 90. In the air preheater 40, the combustion air supplied to the pressurized fluidized furnace 20 and the combustion exhaust gas are indirectly heat-exchanged.

(Dust collector)
The combustion exhaust gas discharged from the air preheater 40 is supplied to the dust collector 50 via the path 92. In the dust collector 50, impurities such as incineration ash, dust, and fluidized sand in the combustion exhaust gas are removed, and the removed impurities are temporarily stored in the bottom of the dust collector 50 and then periodically discharged to the outside. . As the dust collector 50, a known dust collector such as a ceramic bag filter or a cyclone can be used, and a ceramic bag filter is particularly preferable.

(Supercharger)
The combustion exhaust gas discharged from the dust collector 50 is supplied to the supercharger 60 via the path 93. The supercharger 60 includes a turbine 61 that is rotated by combustion exhaust gas discharged from the dust collector 50, a shaft 63 that transmits the rotation of the turbine 61 to the compressor 62, and a rotation of the turbine 61 that is transmitted via the shaft 63. And a compressor 62 that rotates with movement to generate compressed air. The compressed air generated by the supercharger 60 is supplied to the air preheater 40 via the path 95 as combustion air. Further, the combustion exhaust gas supplied to the supercharger 60 is used to rotate the turbine 61 and then supplied to the white smoke prevention preheater 70 in the subsequent stage. An activation blower 65 that supplies combustion air at the time of activation is connected to the compressor 62 via a path 66.

(Preheater for white smoke prevention)
In the white smoke prevention heat exchanger 70, the flue gas supplied from the supercharger 60 and the white smoke prevention air supplied from the white smoke prevention fan 71 are indirectly heat-exchanged. The heated white smoke prevention air is supplied to the chimney 87 via the pipe 99, and the combustion exhaust gas whose temperature has been lowered by heat exchange is supplied to the flue gas treatment tower 80 via the pipe 98. As the white smoke prevention heat exchanger 70, a shell-and-tube heat exchanger, a plate heat exchanger, or the like can be used.

(Smoke exhaust treatment tower)
The flue gas treatment tower 80 performs predetermined gas treatment (for example, acid gas treatment with caustic soda) so as to become a combustion exhaust gas that can be discharged to the atmosphere. The gas-treated combustion exhaust gas is mixed with white smoke prevention air and discharged to the atmosphere from a chimney 87 disposed at the upper part of the flue gas treatment tower 80. In addition, although the chimney 87 is installed in the upper part of the flue gas processing tower 80, you may install independently from a flue gas processing tower, without being limited to this.

(Conveying method of fluidized sand)
Next, a conveying method for supplying fluidized sand from the upper tank 101A disposed outside the furnace to the pressurized fluidized furnace 20 will be described with reference to FIG. In addition, in order to make an understanding easy, each process is numbered, and for convenience, steps 1 to 5 are referred to as a pre-step, steps 6 to 10 are referred to as a post-step, and step 11 is referred to as a stand-by step. The latter process can be repeated at least once.

<Step 1>
In order to efficiently transport the fluidized sand from the upper tank 101A to the tank 103, the exhaust valve 113C of the intake / exhaust device 103A is opened and maintained at the same pressure as the pressurized fluidized furnace 20 or slightly higher than the pressurized fluidized furnace 20. The pressure in the tank 103 is reduced.

<Process 2>
The cleaning device 102A is driven to supply the cleaning gas to the upper valve 102 in order to remove the fluid sand adhering to and mixed in the contact portion and the drive portion between the valve body and the seat member of the upper valve 102.
Although the cleaning gas can be supplied to the upper valve 102 immediately before Step 3 and immediately after Step 4, in order to efficiently prevent fluid sand from adhering to the contact portion of the upper valve 102. The supply of the cleaning gas to the upper valve 102 is preferably performed continuously in steps 3 to 5 described later.

<Step 3>
In order to convey the fluid sand from the upper tank 101A to the tank 103, the upper valve 102 is driven to connect the tank 103 with the upper supply device 101 that conveys the fluid sand from the upper tank 101A.
In order to efficiently remove the fluid sand adhering to and mixed in the upper valve 102, it is preferable to start driving the upper valve 102 a few seconds after supplying the cleaning gas to the upper valve 102.

<Step 4>
In order to reduce power consumption and the like, the upper supply device 101 is driven for a predetermined time. Note that the predetermined time for driving the upper supply device 101 is determined from the transport amount per unit time of the upper supply device 101, the capacity of the tank 103, and the like.

<Step 5>
After the upper supply device 101 is driven for a predetermined time, the upper supply device 101 is stopped, the upper valve 102 is driven, and the upper supply device 101 and the tank 103 are disconnected.

<Step 6>
In order to prevent backflow of combustion exhaust gas and the like from the pressurized fluidized furnace 20 to the tank 103 and to prevent corrosion of the inner surface of the tank 103, the intake valve 113B of the intake / exhaust device 103A is driven to the same pressure as the pressurized fluidized furnace Alternatively, the pressure in the tank 103 is increased to a slightly higher pressure than the pressurized fluidized furnace 20.
In order to efficiently prevent the back flow such as a combustion exhaust gas from the pressurized fluidized furnace 20 to the tank 103, 0.001~0.01M P a pressure higher than the pressure of the pressure tank 103 pressurized fluidized furnace 20 to set the preferred, the pressure in the tank 103 and after reaching the 0.001~0.01M P a pressure higher than the pressure of the pressurized flow furnace 20 stops driving the intake valve 113B.

<Step 7>
The cleaning device 105A is driven to supply the cleaning gas to the lower valve 105 in order to remove the fluid sand adhering to and mixed in the contact portion and driving portion between the valve body and the seat member of the lower valve 105.
Although the supply of the cleaning gas to the lower valve 105 can be performed immediately before step 8 and immediately after step 9, which will be described later, in order to efficiently prevent fluid sand from adhering to the contact portion of the lower valve 105. The supply of the cleaning gas to the lower valve 105 is preferably performed continuously in steps 8 to 10 described later.

<Step 8>
In order to convey the fluidized sand from the tank 103 to the pressurized fluidized furnace 20, the lower valve 105 is driven to connect the pressurized fluidizer 20 with the lower supply device 104 that conveys the fluidized sand from the tank 103.
In order to efficiently remove the fluid sand adhering to and mixed in the lower valve 105, it is preferable to start driving the lower valve 105 a few seconds after supplying the cleaning gas to the lower valve 105.

<Step 9>
In order to reduce power consumption and the like, the lower supply device 104 is driven for a predetermined time. The predetermined time for driving the lower supply device 104 is determined based on the transport amount per unit time of the lower supply device 104, the capacity of the pressurized fluidized furnace 20, and the like.

<Step 10>
After the lower supply device 104 is driven for a predetermined time, the lower supply device 104 is stopped, the lower stage valve 105 is driven, and the lower supply device 104 and the pressurized flow furnace 20 are disconnected.

<Step 11>
In order to prevent backflow of combustion exhaust gas and the like from the pressurized fluidized furnace 20 to the tank 103 and to prevent corrosion of the inner surface of the tank 103, the pressure of the tank 103 is maintained at a pressure higher than that of the pressurized fluidized furnace 20.

1 Pressurized Fluid Furnace System 10 Storage Device 20 Pressurized Fluid Furnace 40 Air Preheater
50 Dust Collector 60 Supercharger 61 Turbine 62 Compressor 70 White Smoke Prevention Preheater 80 Smoke Treatment Tower 101 Upper Supply Device 101A Upper Tank 102 Upper Valve 102A Cleaning Device (First Cleaning Device)
103 Tank 103A Intake / exhaust device 103B Pressure measuring means 104 Lower supply device 105 Lower valve 105A Cleaning device (second cleaning device)
106 Supply conveyance device 113B Intake valve 113C Exhaust valve

Claims (7)

A pressurized fluidizing furnace for burning an object to be treated, an upper supply device arranged between the upper supply device for conveying the fluid medium to the pressurized fluidizing furnace and the tank, and a lower part for conveying the fluid medium below the tank In a method for conveying a fluid medium in a pressurized fluidized furnace system comprising a conveying device having a lower valve disposed between a supply device and the pressurized fluidized furnace,
The pressure in the tank is reduced, the upper valve is driven to communicate the upper supply device with the tank, the upper supply device is driven to transport the fluid medium to the tank, and then the upper valve is driven to A pre-stage process in which the supply device and the tank are not in communication;
The pressure in the tank is increased, the lower valve is driven to connect the tank and the pressurized fluidized furnace, the lower supply device is driven to transport the fluid medium to the pressurized fluidized furnace, and then the lower valve is after repeated one or more times also reduce the transfer step comprising a drive to the tank and the pressurized flow reactor and a subsequent step of the non-communicating,
Have a waiting step of maintaining the state of being boosted pressure in the tank,
During transport of the fluid medium to the tank from the upper supply device, supplying a cleaning gas to the upper valve, during transport of the pressurized flow reactor in the fluidized medium from the tank, to supply the cleaning gas into the lower valve A method for conveying a fluid medium in a pressurized fluidized-furnace system. Method of transporting impurities of pressurized fluid Douro system of claim 1, wherein for boosting the pressure in the tank to 0 to 0.01 P a higher pressure than the pressurized fluid Douro. The method of conveying a fluid medium in a pressurized fluidized furnace system according to claim 1 or 2, wherein the deterioration state of the upper and lower valves is detected by pressure measuring means provided in a tank. The method of conveying a fluid medium in a pressurized fluid furnace system according to claim 1 or 2 , wherein the fluid medium is a mixture of an unused fluid medium and a used fluid medium. A pressurized fluidizing furnace for burning an object to be treated; an upper supply device disposed between a tank and an upper supply device for conveying a fluid medium to the pressurized fluidizing furnace; and a first gas for supplying a cleaning gas to the upper valve . A cleaning device, a lower supply device that conveys a fluid medium below the tank, a lower valve disposed between the pressurized flow furnace, and a second cleaning device that supplies a cleaning gas to the lower valve. In a pressurized flow furnace system equipped with a transfer device,
The tank includes an intake / exhaust device for raising and lowering the pressure in the tank,
During pressure reduction in the tank, the upper valve is used to switch between communication and non-communication between the upper supply device and the tank,
During the transfer of the fluid medium from the upper supply device to the tank, the cleaning gas is supplied to the upper valve by the first cleaning device,
During the pressure increase in the tank, the lower valve is used to switch between communication and non-communication between the tank and the pressurized fluidized furnace .
Pressurized Douro system characterized by during transport of the pressurized flow reactor in the fluidized medium from the tank, made of the configuration by the second cleaning unit, to supply cleaning gas to the lower valve. 6. The pressurized fluidized furnace system according to claim 5, wherein the lower supply device comprises a screw conveyor. The pressurized fluidized furnace system according to claim 6, wherein the upper supply device comprises a screw conveyor.

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