JP2011080703A - Incineration facility and method for operating the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To develop an incineration facility free from causing fire or powder dust explosion by the back flow of combustion gas or flame in a sealing hopper for supplying saw dust and through a path for feeding the saw dust even if the internal pressure of an incinerator rises because of rapid combustion of the saw dust which is an object to be incinerated, and a method for operating the incineration facility. <P>SOLUTION: When a material seal in the sealing hopper for storing the saw dust cannot be maintained, or when the pressure in the incinerator is higher than the atmospheric pressure, the incineration facility blocks a chute by a blocking damper provided for the chute through which the saw dust passes. In the incineration facility, the moisture of the saw dust is adjusted to be within a range of 10-20% for incineration. The inner surface lower end position of a screw-type supply device for supplying the saw dust to the incinerator is at the height within a vertical distance of 50 mm from the bottom surface of a stirring blade. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

In the incinerator that stirs the incinerated material on the hearth and burns the incinerated material, when incinerating fine biomass such as sawdust as the incinerated material, The present invention relates to an incineration facility and an incineration facility operating method capable of realizing an operation that does not cause a backfire, a dust explosion in a charging route, or a dust explosion in an incinerator.

2. Description of the Related Art A circular stirring incinerator having a stirrer that rotates horizontally while blowing air on the hearth is widely used to incinerate human waste sludge, residue, sewage sludge, and the like. The heat generated by the combustion of this incinerator is used as a heat source for drying human waste sludge in a human waste treatment plant, but in recent years there has been a decrease in the amount of residue generated, and there is not enough heat to dry human waste sludge. Therefore, fuel such as heavy oil is burned with a burner to compensate for the lack of heat. The amount of heavy oil used is enormous throughout the year, which contributes to a significant increase in running costs.
On the other hand, a large amount of sawdust is generated at woodworks, etc., so it is used effectively by composting sawdust. However, it takes time to compost, so it has not been widely used. Are often discarded as waste.
Therefore, instead of burning heavy oil or the like with a burner to make up for the shortage of heat, the present inventor attempted to make up for the shortage of heat by burning these sawdust in an incinerator.

JP-A-60-23715

In a normal incinerator, operation is performed while maintaining a negative pressure state rather than atmospheric pressure in order to prevent the combustion gas from leaking outside the incinerator. However, since saw dust easily burns rapidly, the internal pressure of the incinerator frequently increases, so that the combustion gas and flame in the supply device that supplies saw dust to the incinerator, the chute that sends saw dust to the supply device, and the hopper Backflowed (backfire), causing a problem in the feeder, chute or hopper.
In addition, when the saw dust is intense, dust explosion may occur.

The present invention has been made in view of such a background.
That is, the invention according to claim 1 is an incinerator equipped with a stirring blade, a seal hopper that accommodates an incinerator, a screw type supply device that supplies the incinerator to the incinerator, the seal hopper, and the screw type In an incineration facility comprising a chute for connecting a supply device, the seal hopper is provided with a level meter and / or a weight meter, the incinerator is provided with a pressure sensor, and the chute is configured to block the movement of the incinerated object or gas. It is characterized by comprising.

According to a second aspect of the present invention, in the incineration facility according to the first aspect, the lower end position of the inner surface of the screw type supply device is located at a height within 50 mm in a vertical distance from the bottom surface of the stirring blade of the incinerator. Features.

The invention according to claim 3 is the operation method of the incineration facility according to claim 1 or 2, when the level meter can no longer detect the stay of the incinerated object in the seal hopper, and / or the weight meter. The shut-off damper is shut off when the measured value obtained by the above becomes smaller than a predetermined value.

According to a fourth aspect of the present invention, in the method for operating an incineration facility according to the first, second, or third aspect, the shut-off damper is shut off when the pressure measured by the pressure sensor is higher than atmospheric pressure. .

The invention according to claim 5 is the operation method of the incineration facility according to claim 1, 2, 3 or 4, wherein the incinerated material is biomass.

The invention according to claim 6 is the operation method of the incineration equipment according to claim 1, 2, 3, 4 or 5, wherein the moisture of the incinerated material is in the range of 10% to 20%. And
The above problems can be solved by using the configuration of the invention described in each of the claims as a means.

First, according to the first aspect of the present invention, when the inside of the seal hopper for storing saw dust, which is an incinerator, is reduced to the amount of remaining saw dust that is insufficient to maintain the material seal, or the saw dust is generated in the incinerator. Combustion by shutting off sawdust and gas movement in the chute with a shutoff damper provided in the chute between the seal hopper and the screw type feeder when the incinerator internal pressure becomes higher than atmospheric pressure due to rapid combustion. Gas and flame can be prevented from flowing back to the screw type supply device and the seal hopper, and fire and dust explosion in the screw type supply device and hopper can be prevented.

According to the second aspect of the present invention, the sawdust sent out from the screw-type supply device becomes difficult to be wound up by the flame or combustion gas flow in the incinerator, and gently burns while being spread on the hearth by the stirring device. Therefore, the rapid fluctuation of the incinerator internal pressure is suppressed, and the backflow of the combustion gas and flame to the screw type supply device and the seal hopper can be suppressed.
Moreover, since a part of the sawdust sent out from the screw-type supply device is pushed into the incinerated material layer, it can be burned more gently by suppressing contact with air.

According to the invention of claim 3, when the inside of the seal hopper storing saw dust as incinerated material is reduced to the amount of remaining saw dust that is insufficient for maintaining the material seal, the seal hopper and the screw-type supply device are By shutting off the chute with the shut-off damper provided in the chute, the combustion gas and flames are prevented from flowing back to the screw-type supply device and seal hopper, and fire and dust explosion in the screw-type supply device and seal hopper are prevented. Can do.

Further, according to the invention described in claim 4, when the sawdust burns rapidly in the incinerator and the incinerator internal pressure becomes higher than the atmospheric pressure, the interruption provided in the chute between the seal hopper and the screw type supply device. By shutting off the chute with the damper, the combustion gas and flame can be prevented from flowing back to the screw type supply device and the seal hopper, and fire and dust explosion in the screw type supply device and hopper can be prevented.

According to the fifth aspect of the present invention, since the amount of heat generated by burning biomass that is difficult to effectively use in an incinerator can be used for drying sludge, the amount of fuel such as heavy oil can be reduced.

According to the sixth aspect of the present invention, if the water content is 10% or more, backfire into the screw supply device or chute is less likely to occur, and dust explosion in the incinerator is less likely to occur. On the other hand, if the moisture content is 20% or less, the incinerated products discharged from the incinerator will not be mixed with unburned materials, and the incineration operation can be efficiently performed by effectively using the heat generated during combustion of the incinerated materials. It can be carried out.

It is a block diagram which shows the incineration equipment of this invention. The notch cross section of the incinerator of this invention is illustrated.

The best mode of the incineration equipment and the incineration equipment operating method of the present invention is as shown in the following examples, but it is possible to make technical modifications to the present examples within the scope of the technical idea of the present invention. It is.

Below, the component of the incineration equipment S which is this invention is demonstrated.
FIG. 1 is a block diagram of an incineration facility S that is an embodiment of the present invention.
The incinerator 1 is made of a refractory material and has a circular horizontal cross section. The upper portion of the incinerator 1 is an exhaust part 14, and the exhaust part 14 is provided with an exhaust port 14 a.
Combustion gas generated by incineration is sent to a sludge drying facility (not shown) outside the incinerator 1 through the exhaust port 14a. The sludge drying facility or the like is usually provided with an exhaust fan, and the combustion gas is sucked by the exhaust fan, so that the incinerator 1 is in a negative pressure state from the atmospheric pressure.
Moreover, the pressure gauge 15 which is a pressure sensor is provided in the upper part of the incinerator 1, and the differential pressure | voltage between the incinerator 1 and atmospheric pressure is measured. This measured value is inputted to a programmable controller (not shown) in the operation panel B (hereinafter referred to as PLC), and an output signal from the PLC so that the pressure in the incinerator 1 becomes a negative pressure state from the atmospheric pressure. Based on the above, the suction force of the exhaust fan is controlled.

As shown in FIG. 2, the hearth 11 of the incinerator 1 includes a stirring device 2, and the stirring device 2 includes a stirring shaft 21 b, a stirring arm 21 c, a stirring blade 21 d, and a driving device 22.
The stirring blade 21d is provided with an air supply hole 21a for supplying air for combustion to the incinerated material layer Y. The stirring shaft 21b and the stirring blade 21d have a hollow structure, and air sent from an air supply source (not shown) passes through the hollow portion and is ejected from the air supply hole 21a. The stirring blade 21d is rotated around the stirring shaft 21b so as to spread the incinerated material layer Y by the driving device 22.

The side wall 12 of the incinerator 1 is provided with a supply port 12a for introducing sawdust W, the side wall 12 is provided with a supply port 12b for introducing residue (or dried sludge), and the side wall 12 is provided with heavy oil. An auxiliary combustion burner 13 is provided for burning the like.
Sawdust W and residue (or dried sludge) thrown in the vicinity of the side wall 12 are ignited or burned by the auxiliary burner 13 by being spread on the stirring blade 21d. When the water content of the sawdust W and residue (or dried sludge) decreases and the temperature rises, they start self-combustion. These sawdust W and residue (or dried sludge) are swollen in the direction of the center of the hearth 11 by the stirring blades 21d while burning, and eventually burn up to the vicinity of the center of the hearth 11 to become ash.

An incineration ash discharge hole 11 a is provided near the center of the hearth 11, and the burned ash passes through the incineration ash discharge hole 11 a and moves downward and is discharged out of the incinerator 1. .
The hearth 11 is preliminarily sanded, and sawdust W and residue (or dried sludge) are put into the hearth 11. Therefore, sand is also discharged together with the ash from the incineration ash discharge hole 11a.

The incineration ash discharge hole 11a is provided with a conveyor (not shown) for transferring ash (and sand). The ash (and sand) is always filled in the incineration ash discharge hole 11a, and the ash (and sand) is discharged from the ash discharge hole 11a so that the predetermined height of the incineration layer Y is maintained. ) Is extracted by the conveyor.
The height of the incinerated material layer Y is maintained at about 100 mm from the hearth surface 11b, and the range of 20 to 60 mm from the bottom surface 21e of the stirring blade 21d is buried in the incinerated material layer Y.
In addition, since the said sand of the hearth 11 reduces gradually with a driving | operation, it is replenished suitably.

A screw-type supply device 31a for supplying sawdust W is inserted into the supply port 12a. The screw-type supply device 31a is provided with a loading port 33, and a chute 41 is fastened to the loading port 33 with a bolt or the like.
Here, the screw-type supply device 31a has a configuration in which a screw 35 is provided in a pipe-shaped cylinder 34, and the lower end position L of the inner surface of the cylinder 34 is higher than the bottom surface 21e of the stirring blade 21d. It is located within 50 mm in vertical distance.
During the incineration operation, the screw type supply device 31 a is always rotated by the drive device 32.

In addition, the screw type supply device 31a has a short length as long as it is allowed in the arrangement of the device, and is preferably one. This is to minimize the space volume of the path from the downstream of the shut-off damper to the incinerator and to minimize the range of burning even if a reverse flow of the flame occurs.

The chute 41 is provided with a blocking damper 42.
The shut-off damper 42 is provided with a damper plate 42a, and the damper plate 42a is provided so as to be rotatable via a link mechanism 42c by an expansion / contraction operation of a rod of the air cylinder 42b.
When the damper plate 42a rotates, the damper plate 42a contacts the inner cylinder opening 42d, the inner cylinder opening 42d is closed by the damper plate 42a, and the movement of sawdust W and gas in the chute 41 is blocked. In a normal incineration operation state, the inner cylinder opening 42d is opened, and the sawdust W freely passes through the inner cylinder opening 42d. While the inner cylinder opening 42d is closed, the sawdust W is not discharged from the seal hopper 51 described later.
The expansion / contraction operation of the rod of the air cylinder 42b is performed with or without the supply of compressor air using the compressor air as a power source. The presence or absence of supply of compressor air is performed by opening and closing the electromagnetic valve 43, and the opening and closing of the electromagnetic valve 43 is controlled by the PLC.

A seal hopper 51 is provided on the upper portion of the chute 41.
The seal hopper 51 includes a screw conveyor 52 at a lower portion, and the saw dust W is discharged or stopped by a driving device 52a provided at an end of the screw conveyor 52.
A discharge port 52b of the screw conveyor 52 for discharging saw dust is provided with a soft flexible chute 53 formed into a cylindrical shape with a thin cloth heat resistant material, and the lower end of the flexible chute 53 is connected to the upper part of the chute 41. Yes.

A hopper portion 54 is provided on the upper portion of the screw conveyor 52. A bracket 54a is provided on the outer surface of the hopper 54, and a load cell 55 is provided on the lower surface of the bracket 54a as an example of a weight scale. The load cell 55 is supported by providing a frame or the like below the load cell 55.
Further, the upper surface of the hopper portion 54 is provided with an insertion port 54b into which sawdust W is introduced, and a soft flexible chute 56 formed in a cylindrical shape with thin cloth-like silicon rubber is provided above the insertion port 54b. It is prepared.

Here, since the discharge port 52 is provided with a soft flexible chute 53 and the input port 54b is provided with a flexible chute 56, the load hopper 55 determines the weight of saw swarf W accumulated in the seal hopper 51 and the seal hopper 51 by the load cell 55. It is measured with sufficient accuracy. Further, the weight of the seal hopper 51 includes the weight of the drive device 52a. However, since the power cable (not shown) to the drive device 52a is flexible, it hardly affects the weight measurement of the load cell 55. .

Sawdust W is sent from the paddle conveyor 61 to the seal hopper 51 by a conveying device (not shown).

Here, in the present embodiment, the load cell 55 measures the weight of the seal hopper 51 that does not contain the sawdust W, and also measures the weight in the state where the sawdust W is contained. The amount of staying of the sawdust W is determined by the PLC.
If it is determined that the amount of staying of the sawdust W in the seal hopper 51 is insufficient to maintain the material seal, the driving device 52a is stopped and the inner cylinder opening 42d is closed by the damper plate 42a. If it is determined that the amount of staying can be maintained by the material seal, the inner cylinder opening 42d is opened, the driving device 52a is driven, and the sawdust W is discharged from the discharge port 52b.
Further, when it is determined that the amount of staying of the sawdust W in the seal hopper 51 is sufficiently large, the equipment (not shown) on the upstream side of the seal hopper 51 including the paddle conveyor 61 is stopped so that the supply of the sawdust W to the seal hopper 51 is stopped. Is stopped.

A level meter can also be used as means for determining the amount of staying of the sawdust W in the seal hopper 51. For example, when a capacitance level meter is installed in the hopper unit 54, the material seal can be provided by providing a capacitance level meter at a position where the limit stagnation amount at which the material seal cannot be maintained by the seal hopper 51 can be detected. Whether it is sufficient or insufficient to maintain can be determined by the PLC based on the signal from the capacitance level meter.
In addition, the state where the material seal is maintained is a state where a certain amount of sawdust W stays in the seal hopper 51 so that gas cannot move between the discharge port 52b and the input port 54b by the sawdust W. It is.

The paddle conveyor 61 has an input port 61b into which the sawdust W is input at the upper part of one end, and a discharge port 61a under the other end.
A moisture meter 62 is provided on the upper surface 61c between the input port 61b and the discharge port 61a of the paddle conveyor 61, and a hydration nozzle 63 is provided on the upper surface 61c between the moisture meter 62 and the discharge port 61a. . As an example, the moisture meter 62 may be an infrared absorption moisture meter.
When the moisture content of the sawdust W is measured by the moisture meter 62 and the moisture content of the sawdust W is lower than 10%, water is sprayed from the water nozzle 63 to the sawdust W that is being mixed and stirred while being transported by the paddle conveyor 61. The water content of W is increased.
The moisture content of the sawdust W is a value expressed as a percentage by dividing the weight of moisture contained in the sawdust W by the weight of the sawdust W containing moisture.

Here, a certain amount of sawdust W is continuously fed into the paddle conveyor 61 using an appropriate device controlled by the PLC.
On the other hand, a moisture value as a management target of the sawdust W is input to the PLC.
When the moisture of the sawdust W is measured by the moisture meter 62 and the measured value is input to the PLC, it is compared with the moisture value as the management target in the PLC, and added to make the sawdust W into the moisture as the management target. The amount of water is calculated in the PLC. Based on the calculated value, the hydration pump 64 is driven by the PLC, and the calculated amount of hydration is added to the sawdust W from the hydration nozzle 63.

The supply port 12b of the incinerator 1 is provided with a screw type supply device 31b. On the other hand, residue (or dried sludge) is introduced into the incinerator 1 from the screw type supply device 31b. The screw type supply device 31b is charged with a residue (or dried sludge) from a hopper (not shown) that stores the residue (or dried sludge). The residue (or dried sludge) is usually high in moisture, and the hopper for storing the residue (or dried sludge) is kept with a material seal by an appropriate means, so that the combustion gas (gas) from the incinerator 1 is maintained. ) Backflow or backfire does not occur.

The incineration facility S of the present invention is configured as described above as an example, and the operation mode thereof will be described below.
First, before operation, sand is spread on the hearth surface 11b. Next, the exhaust fan is activated to bring the incinerator 1 into a negative pressure state. Next, the air is supplied to the stirring blade 21d while driving the driving device. The agitating blade 21 d is rotated by 22. Subsequently, sawdust W and residue (or dried sludge) are introduced into the incinerator 1 from the supply ports 12a and 12b, heavy oil or the like is burned by the auxiliary burner 13, and these are ignited to start combustion. Therefore, the incinerated material layer Y includes the sand, sawdust W and residue (or dried sludge), unburned material, burning material, or ash.
When the self-combustion starts and it is confirmed by a thermometer (not shown) of the exhaust section 14 of the incinerator 1 that the temperature of the combustion gas has risen sufficiently, the auxiliary burner 13 stops. Since the sawdust W and the residue (or dried sludge) are continuously supplied, a steady state of incineration operation in which self-combustion continues is obtained.
The generated combustion gas is used as a heat source for a sludge drying facility or the like through the exhaust port 14a.

Here, if the moisture of the sawdust W is not adjusted and is continuously put in a dry state where the moisture is lower than 10%, the sawdust W burns violently immediately after being put into the incinerator 1 or the fine powder of the sawdust W Is wound up by the combustion gas, and a dust explosion easily occurs above the surface Y1 of the incineration object. Further, since fine powder of sawdust W is scattered in the path from the screw type supply device 31a to the seal hopper 51, this path is in a state where it is very easy to backfire.
If the water content of the sawdust W is lower than 10%, the water content of the sawdust W is adjusted by the hydrating nozzle 63 and is put into the incinerator 1. Can be prevented.

On the other hand, the lower end position L on the inner surface of the screw type supply device 31a is above the stirring blade bottom surface 21e of the stirring blade 21d and is located within 50 mm in the vertical distance. It is difficult to wind up by the flame of the surface Y1 or the combustion gas flow. Thereby, the dust explosion which is easy to occur above the surface Y1 to be incinerated can be prevented more reliably.
Further, since the vertical distance between the lower end position L of the inner surface and the surface Y1 to be incinerated is close, the sawdust W is partially pushed into the incinerator layer Y by the action of pushing out the screw 35, and the pushed sawdust W Since the contact is suppressed, there is an effect that it is gently burned.

However, in the paddle conveyor 61, since uniform water is not sometimes formed, there is a possibility that sudden combustion occurs immediately after being put into the incinerator 1. Further, there is a possibility that the lumpy saw dust W which sometimes exists may collapse suddenly by the stirring blade 21d and cause abrupt combustion.
The exhaust fan is controlled so that the inside of the incinerator 1 maintains a negative pressure state, but this control cannot catch up during a sudden combustion, and the internal pressure in the incinerator 1 increases rapidly. Due to this sudden increase in internal pressure, the combustion gas (gas) tends to flow back to the seal hopper 51 side via the screw-type supply device 31a, but the pressure gauge 15 measures the increase in internal pressure. Based on the control of the PLC, the inner cylinder opening 42d is instantly closed by the damper plate 42a. Thereby, the path | route of the seal hopper 51 and the incinerator 1 is interrupted | blocked, and it can prevent that combustion gas (gas) and flashback reach the seal hopper 51. FIG.

On the other hand, if the material seal is maintained in the seal hopper 51 due to the stay of sawdust W, the backflow of the combustion gas (gas) can be prevented more reliably.
When the pressure gauge 15 measures that the internal pressure in the incinerator 1 has dropped, the inner cylinder opening 42d is opened and the normal operation state is restored.

On the other hand, if the sawdust W continues to be introduced in a damp state where the moisture content is higher than 20%, the temperature of the combustion gas tends to decrease. An operation that compensates for the shortage of heat supplied to the facility or the like is performed, and it may not be completely burned ash but may be discharged from the incineration ash discharge hole 11a in an unburned state.
As described above, if the moisture content is kept higher than 20%, the amount of heat generated during the combustion of the sawdust W is difficult to use effectively. Therefore, the moisture content of the sawdust W is preferably 20% or less.

When there is a possibility that the sawdust W in such a high moisture state is thrown into the paddle conveyor 61, a branch damper (not shown) is provided at the discharge port 61a of the paddle conveyor 61, and the moisture of the sawdust W becomes a moisture meter. If it is found by measurement of 62 that it is higher than 20%, the saw blade W may be sent to another route (not shown) so as not to be sent to the seal hopper 51 by the branch damper. The sawdust W sent to this other route may be dried by an appropriate means and then put into the paddle conveyor 61 again.
Alternatively, the moisture content of the sawdust W is measured before being supplied to the main incineration facility S. If the moisture content is higher than 20%, the sawdust W may be dried before use.

As described above, according to the present invention, when the material seal of the seal hopper 51 cannot be maintained, or when the internal pressure of the incinerator 1 rises from the atmospheric pressure, the path between the seal hopper 51 and the incinerator 1 is established by the cutoff damper 42a. It is interrupted | blocked, the backflow of the combustion gas (gas) to the sawdust W in the seal hopper 51, the fire and dust explosion in the seal hopper 51 accompanying it can be prevented, and a safe driving | operation can be performed.
In addition, by adjusting and managing the water content of the sawdust W, it is possible to more reliably prevent the backflow of the flame and the dust explosion to the supply path to the incinerator 1 or to efficiently use the heat generated during the burning of the sawdust W. Incineration operation.
In addition, by setting the supply position of the sawdust W to the incinerator 1 to an appropriate position, it is possible to more reliably prevent the backflow of combustion gas and flames or the dust explosion to the supply path to the incinerator 1 and a gentle incineration operation. Can be done.

The present invention can also be applied to the case where the sawdust W is combusted by adding or remodeling an apparatus, a meter, and a route based on the gist of the present invention to an incinerator that performs existing residue (or dried sludge).
Moreover, it may be an incinerator for dry matter such as sewage sludge, factory wastewater sludge, etc. as well as sewage sludge and dried sludge.
In addition to sawdust, biomass that is susceptible to rapid combustion, for example, pulverized waste of food, finely crushed waste of food, or pruned branches that are finely crushed may be used as incinerators. Absent.

DESCRIPTION OF SYMBOLS 1 Incinerator 11 Hearth 11a Incineration ash discharge hole 11b Hearth surface 12 Side wall 12a Supply port 12b Supply port 13 Combustion burner 14 Exhaust part 14a Exhaust port 15 Pressure gauge 2 Stirrer 21a Air supply hole 21b Stirring shaft 21c Stirring arm 21d Stirring blade 21e Stirring blade bottom surface 22 Drive device 31a Screw type supply device 31b Screw type supply device 32 Drive device 33 Input port 34 Cylindrical body 35 Screw 41 Chute 42 Shut off damper 42a Damper plate 42b Air cylinder 42c Link mechanism 42d Inner cylinder opening 43 Solenoid valve 51 Seal hopper 52 Screw conveyor 52a Driving device 52b Discharge port 53 Flexible chute 54 Hopper part 54a Bracket 54b Loading port 55 Flexible chute 61 Paddle conveyor 61a Discharge port 61b Loading port 61c Upper surface 62 Moisture meter 63 Water nozzle 64 hydro pump W sawdust S incinerator Y incinerated layer Y1 incinerated layer surface L inner surface lower end position B pendant

Claims (6)

An incinerator comprising an incinerator having a stirring blade, a seal hopper for storing the incinerator, a screw type supply device for supplying the incinerator to the incinerator, and a chute connecting the seal hopper and the screw type supply device. In equipment,
An incinerator having a level meter and / or a weight meter in the seal hopper, a pressure sensor in the incinerator, and a shut-off damper in the chute for blocking movement of the incinerated object or gas. The incineration facility according to claim 1, wherein the lower end position of the inner surface of the screw-type supply device is located at a height within 50 mm in vertical distance from the bottom surface of the stirring blade of the incinerator. 3. The method of operating an incineration facility according to claim 1 or 2, wherein the level meter cannot detect the stay of the incinerated object in the seal hopper and / or the measured value by the weight meter is smaller than a predetermined value. The operation method of the incineration facility is characterized by shutting off the shut-off damper when it becomes. 4. The method for operating an incinerator according to claim 1, wherein when the pressure measured by the pressure sensor is higher than atmospheric pressure, the shut-off damper is shut off. The incineration facility operating method according to claim 1, 2, 3, or 4, wherein the incinerated material is biomass. 6. The method for operating an incineration facility according to claim 1, wherein the water content of the incinerated material is in the range of 10% to 20%.

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