JP2007271203A - Fluidized bed gasification furnace and its fluidized bed monitoring/controlling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluidized bed gasification furnace and its monitoring/controlling method capable of easily detecting a state of a fluidized bed such as a bed height and defective flowing in a fluidized bed gasification furnace, and specifying a position of occurrence of local defective flowing. <P>SOLUTION: This fluidized bed gasification furnace 1 generating a thermal decomposition gas 53 by thermally decomposing a waste 50, having a plurality of blast boxes 10a, 10b arranged in parallel with each other at a furnace lower portion, and forming a fluidized bed 9 by fluidizing fluid sand by combustion air 51 supplied into the furnace through the blast boxes, comprises a first group of temperature sensors 23, 24, 25 including at least one temperature sensor 23 positioned in the fluidized bed 9 in starting the fluidized bed gasification furnace 1, and composed of the plurality of temperature sensors arranged in the depth direction of the fluidized bed, and a second group of temperature sensors 21, 24, 22 composed of a plurality of temperature sensors disposed in the arrangement direction of the blast boxes, and the position of defective flowing is specified on the basis of a temperature distribution obtained from the groups of temperature sensors. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fluidized bed gasification furnace in a gasification and melting system in which waste is pyrolyzed to generate pyrolysis gas and ash is melted by the combustion heat of the pyrolysis gas. The present invention relates to a fluidized bed gasification furnace capable of monitoring a fluidized bed state such as a bed height, and quickly eliminating the occurrence of a fluid failure so as to stabilize the flow, and a fluidized bed monitoring and control method thereof. .

  Conventionally, a gasification and melting system is known as a technology capable of processing a wide range of wastes such as municipal waste, non-combustible waste, incineration residue, sludge, landfill waste, and the like. The gasification and melting system includes a gasification furnace that thermally decomposes and gasifies waste, and a pyrolysis gas that is provided downstream of the gasification furnace and that is generated in the gasification furnace at high temperature. It has a melting furnace that melts ash content into slag and a secondary combustion chamber that combusts exhaust gas discharged from the melting furnace. In order to reduce the waste resources, reduce the volume and make them harmless, The slag is taken out from the furnace and reused as a civil engineering material such as a roadbed material, or the waste heat is recovered from the exhaust gas discharged from the secondary combustion chamber to generate electric power (Patent Document 1, etc.).

As a gasification furnace of such a gasification melting system, a fluidized bed gasification furnace is often used. In a fluidized bed gasification furnace, a fluidized bed is formed in which the fluidized medium is fluidized by supplying combustion air to the bottom of the furnace, and the waste thrown into the fluidized bed is partially combusted and maintained at a high temperature by the combustion heat. It is a device that thermally decomposes waste in a fluidized bed. The incombustible material mixed in the waste is floated by the combustion air and discharged from the incombustible material discharge port provided in the furnace bottom.
In this way, the fluidized bed is responsible for fluidizing the fluidized medium by supplying combustion air from the lower part of the furnace and promoting partial combustion of the waste to maintain the temperature in the fluidized bed. It is important to maintain it stably.

  In Patent Document 2 (Japanese Patent Laid-Open No. 10-9511), in a fluidized bed having two different regions, the mass velocity and the oxygen content of fluidized gas (combustion air) in these two regions are made different so that the inside of the fluidized bed A configuration for forming a circulating flow of a fluid medium is proposed. By making the fluid medium in a good fluid state in this way, heat can be diffused to enable high-load operation, and combustibles are prevented from sinking too much into the bottom of the furnace, and the rise of pyrolysis gas is promoted. In addition, it encourages the discharge of non-combustible materials.

Further, as a technique for appropriately maintaining the temperature in the fluidized bed, Patent Document 3 (Japanese Patent Laid-Open No. 2003-343823) discloses a technique in which a temperature detector is installed in the fluidized bed, and the flow detected by the temperature detector. A configuration is disclosed in which the supply amount of fluidized air (combustion air) is controlled so that the bed temperature matches a set value.
Further, Patent Document 4 (Japanese Patent Application Laid-Open No. 2004-132667) proposes a fluidized bed gasification melting furnace system that ensures stable flow and enables temperature control, and air and oxygen with high nitrogen concentration are proposed. The air is separated into high-concentration air, and air having a high nitrogen concentration is supplied to the fluidized bed gasifier, so that fluidization is maintained while suppressing combustion in the gasifier. Further, the layer temperature is detected by a thermometer, and when the temperature tends to decrease, air having a high oxygen concentration is supplied.

JP 2004-144402 A Japanese Patent Laid-Open No. 10-9511 JP 2003-343823 A JP 2004-132667 A

As described above, in a fluidized bed gasifier, it is important to stably generate a pyrolysis gas containing a combustible component. Therefore, the state of the fluidized bed in which pyrolysis is performed is sequentially monitored, and this is improved. Need to keep. That is, it is necessary to maintain the bed height of the fluidized bed in accordance with the waste quality, and to detect and quickly eliminate the occurrence of a flow failure.
The gasification and melting system described in Patent Document 1 does not have a configuration for detecting the state of the fluidized bed, and the fluidized bed gasification method described in Patent Document 2 has a problem such as poor flow and bed height. There is no means for detecting the flow state.

  Further, the configurations described in Patent Document 3 and Patent Document 4 detect and control the temperature of the fluidized bed, and it is difficult to accurately grasp the fluidized bed state such as fluidity failure and bed height. In addition, as one of the causes of poor flow, the diffuser pipe that supplies fluidized gas (combustion air) is blocked by waste or incombustibles, and the amount of fluidized gas required for fluidization is not supplied. It is conceivable to cause local flow failure. However, in the above prior art, it is difficult to specify the site where the flow failure occurs, and it is actually impossible to deal with such a local flow failure.

Therefore, in view of the above-mentioned problems of the prior art, the present invention can easily and in real time detect the fluidized bed state such as the bed height and the fluidity failure in the fluidized bed gasification furnace, and the occurrence of the local fluidity failure. The purpose is to propose a fluidized bed gasifier capable of specifying the part and a fluidized bed monitoring / controlling method.
Further, when a local fluid failure in the fluidized bed is detected, a fluidized bed gasification furnace capable of quickly eliminating the fluid failure and stabilizing the fluidized state, and a fluidized bed monitoring and control method thereof The purpose is to propose.

Accordingly, in order to solve such a problem, the present invention is a fluidized bed gasification furnace that thermally decomposes waste to generate pyrolysis gas, and has a plurality of wind boxes arranged in parallel at the lower part of the furnace, In a fluidized bed gasification furnace in which a fluidized bed is formed by fluidizing a fluidized medium by combustion air supplied into the furnace through an air box,
A first sensor group comprising at least one temperature sensor located in the fluidized bed when the fluidized bed gasifier is started up, and comprising a plurality of temperature sensors installed in the depth direction of the fluidized bed;
And a second temperature sensor group comprising a plurality of temperature sensors installed in the direction in which the wind boxes are arranged.

According to the present invention, the bed height of the fluidized bed can be easily grasped by the first temperature sensor group installed in the depth direction of the fluidized bed, and the second temperature sensor installed in the direction in which the wind boxes are arranged. Since the site where the flow failure occurs can be easily specified by the group, it is possible to grasp the fluidized bed state in real time with a simple configuration.
In addition, since at least one temperature sensor in the first temperature sensor group is located in the fluidized bed that is filled when the fluidized bed gasification furnace is started up, the fluidization start at the start-up is accurately performed. I can judge. This is because the fluidized bed temperature rises after the start of fluidization than before the start of fluidization, and therefore the start of fluidization can be determined by detecting this temperature change. Since the combustion air may not be supplied at startup, the fluidized bed at startup includes a stationary state.
Furthermore, since the first temperature sensor group is installed in the depth direction of the fluidized bed, the bed height and the fluidized state of the fluidized bed can be easily grasped from the temperature distribution in the depth direction.

On the other hand, a plurality of second temperature sensor groups are installed at a predetermined interval in the arrangement direction of the wind boxes, with the installation height in the depth direction being substantially the same. A temperature distribution in a horizontal section of the fluidized bed is obtained by the second temperature sensor group, and an abnormal portion of the fluidized bed is detected by comparing this temperature distribution with the temperature distribution during steady operation. For example, it is considered that a local flow failure has occurred at a position where the temperature distribution partially shows a low temperature. As a result, it is possible to easily identify the poor flow region in real time.
In the present invention, the pyrolysis gas generated in the fluidized bed gasifier includes char (unburned carbon) and ash.

The fluidized bed is divided into three strip regions in the direction in which the wind boxes are arranged, and in the second temperature sensor group, at least one temperature sensor is arranged in each strip region. To do.
In this way, by dividing the fluidized bed into three strip regions and detecting the temperature of each region, the temperature distribution of the entire fluidized bed can be efficiently grasped.

The air temperature control means for detecting the temperature distribution of the horizontal section of the fluidized bed by the second temperature sensor group and controlling the amount of combustion air supplied to the wind box based on the detected temperature distribution. Features.
According to the present invention, it is possible to identify a flow failure portion from the temperature distribution obtained by the second temperature sensor group, and to quickly eliminate the flow failure by controlling the combustion air supply amount, thereby stabilizing the flow. be able to.

Further, at least one temperature sensor in the second temperature sensor group is installed at or near the falling position of the fluidized medium when the fluidized medium is supplied to the fluidized bed. .
It is considered that the portion where fluid failure is most likely to occur in the fluidized bed of the fluidized bed gasification furnace is near the falling position of the fluidized medium. Therefore, as in the present invention, by arranging the second temperature sensor group at or near the falling position of the fluid medium, it is possible to reliably detect the occurrence of fluid failure.

Furthermore, the position of the fluidized medium when the fluidized medium is supplied to the fluidized bed is a position close to the side wall of the fluidized bed gasification furnace, and the first temperature sensor group is the position of the fluidized medium falling. Alternatively, it is installed in the depth direction near the dropping position.
In this way, by installing the first temperature sensor group at or near the falling position of the fluidized medium, it is easy to detect the bed height and flow failure of the fluidized bed, and the temperature sensor is installed near the center of the fluidized bed. Since it is difficult, the temperature sensor can be easily installed by setting the falling position of the fluid medium close to the side wall.

Also, a fluidized bed gasification furnace for pyrolyzing waste to generate pyrolysis gas, wherein combustion air is supplied into the furnace through a plurality of wind boxes arranged in parallel at the lower part of the fluidized bed gasification furnace. In a method for monitoring and controlling a fluidized bed formed by supplying and fluidizing a fluid medium with the combustion air,
The fluidized bed is mainly composed of a first sensor group including at least one temperature sensor positioned in the fluidized bed when the fluidized bed gasification furnace is started up, and a plurality of temperature sensors installed in the depth direction of the fluidized bed. Detect the height of the
A temperature distribution of a horizontal section of a fluidized bed is detected by a second temperature sensor group consisting of a plurality of temperature sensors arranged in the direction in which the wind boxes are arranged, and a defective flow portion is specified based on the detected temperature distribution. And

Further, when the poor flow region is specified, the amount of combustion air supplied to the wind box located below the poor flow region is temporarily increased.
Furthermore, after increasing the combustion air supply amount, the pressure in the wind box is detected, and when the pressure falls within a steady operation range, the increased combustion air supply amount is restored. .

  As described above, according to the present invention, by installing the first temperature sensor group and the second sensor group in the fluidized bed, fluidization at the time of start-up, fluidized bed height, and local It is possible to specify the flow failure portion, and it is possible to easily and in real time detect the state of the fluidized bed in the fluidized bed gasification furnace. Furthermore, when a poor flow region is specified, it is possible to quickly eliminate the defective flow and stabilize the flow state by controlling the amount of combustion air supplied to the wind box.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.
FIG. 1 shows the configuration of a fluidized bed gasification furnace according to an embodiment of the present invention, where (a) is a side sectional view, (b) is a sectional view taken along line XX of (a), and FIG. 2 is a gasification melting system. It is a whole block diagram which shows the outline of this.

First, the schematic configuration of the gasification and melting system according to the present embodiment will be described with reference to FIG.
The waste 50 input from the waste input hopper 30 is crushed and dried as necessary, and then quantitatively supplied to the fluidized bed gasifier 1 through the dust feeder 31. In the fluidized bed gasification furnace 1, combustion air 51 having a temperature of about 120 to 230 ° C. and an air ratio of about 0.2 to 0.7 is blown into the furnace through the wind box 10 from the lower part of the furnace, and the fluidized bed temperature is 500. It is maintained at about ˜650 ° C.
The waste 50 is pyrolyzed and gasified in the fluidized bed gasification furnace 1 and decomposed into gas, tar and char (carbide). Tar is a component that becomes liquid at room temperature, but is present in a gaseous state in the gasification furnace.
The char is gradually pulverized in the fluidized bed and is introduced into the swirl melting furnace 33 of the melting facility 32 along with the gas and tar. Hereinafter, these components introduced into the swirl melting furnace 33 are collectively referred to as a pyrolysis gas 53. The melting facility 32 includes a swirl melting furnace 33, a secondary combustion chamber 34 connected above the swirl melting furnace 33, and a boiler unit 35 connected to the downstream side of the secondary combustion chamber 34. Is done.

The pyrolysis gas 53 discharged from the top of the fluidized bed gasification furnace 1 is introduced into the pyrolysis gas burner of the swirl melting furnace 33 through a lining duct. In the pyrolysis gas burner, pyrolysis gas 53 is mixed with combustion air 54 and introduced into the furnace to form a swirling flow. At this time, the combustion air may have an air ratio of 0.9 to 1.1, preferably about 1.0.
In the swirl melting furnace 33, the mixed gas of the pyrolysis gas 53 and the combustion air 54 is combusted so that the furnace temperature is maintained at 1300 to 1500 ° C., and the ash content in the pyrolysis gas 53 is melted and slagged. The molten slag adheres and flows down on the inner wall surface of the swirl melting furnace 33 and is discharged from the slag outlet at the bottom of the furnace. The slag discharged from the slewing melting furnace 33 is rapidly cooled in the granulated water tank 36, carried out by the slag conveyor 37, and collected as granulated slag. The recovered granulated slag can be effectively used for roadbed materials and the like.

On the other hand, the combustion exhaust gas discharged from the swirl melting furnace 33 is introduced into the secondary combustion chamber 34. In the secondary combustion chamber 34, the combustion air 55 is supplied so as to have an air ratio of 1.2 to 1.5, and unburned components in the combustion exhaust gas are completely burned here.
The combustion exhaust gas is heat-recovered by the boiler unit 35 and cooled to about 200 to 250 ° C. The combustion exhaust gas discharged from the boiler unit 35 is introduced into the temperature reducing tower 38 and is cooled to about 150 ° C. by direct water spray. The combustion exhaust gas discharged from the temperature reducing tower 38 is sprayed with slaked lime and activated carbon in the flue as necessary, and introduced into the reaction dust collector 39. The reaction dust collector 39 removes soot, acid gas, DXNs and the like in the combustion exhaust gas. The dust ash discharged from the reaction dust collector 39 is treated with chemicals and disposed of in landfill. The combustion exhaust gas is reheated by the steam heater 40 and NO _x is removed by the catalyst reactor 41, and then the attracting fan 42. It is emitted from the chimney 43 through the atmosphere.

Next, a fluidized bed gasification furnace which is a main configuration of the present embodiment will be described with reference to FIG.
As shown in FIGS. 1A and 1B, a fluidized bed gasification furnace 1 has a gasification furnace main body 2 having a rectangular tube shape, and a waste inlet 3 is provided on one side wall of the main body 2. In addition, a fluidized sand supply port 6 disposed on the side wall facing the waste input port 3 and an auxiliary combustion burner 7 disposed adjacent to the fluidized sand supply port 6 are provided at the bottom of the side wall. Is provided with an incombustible discharge port 5. In addition, the shape of the gasification furnace main body 2, and the attachment position of the waste supply port 3, the fluidized sand supply port 6, and the auxiliary combustion burner 7 are not limited to the above-described configuration.

The bottom portion 8 of the gasification furnace main body 2 is inclined downward from the waste supply port 3 side toward the incombustible discharge port 5 side, and a plurality of air diffusers (not shown) are provided on the bottom portion 8. Yes.
A plurality of wind boxes 10 (10a, 10b) are provided below the bottom 8. A plurality of wind boxes 10 are arranged in parallel in the inclination direction of the furnace bottom 8. In this embodiment, a configuration in which two wind boxes 10a and 10b are arranged is shown. Combustion air 51 is supplied to each of the wind boxes 10a and 10b by the pushing fan 12. The combustion air 51 is preferably set to a temperature of about 120 to 230 ° C. and an air ratio of about 0.2 to 0.7, and steam may be added as necessary.

Dampers 11a and 11b are installed on the combustion air flow path to the wind boxes 10a and 10b, and the amount of combustion air supplied to the wind boxes 10a and 10b (air volume) is adjusted by adjusting the opening of the dampers 11a and 11b. It comes to control. The combustion air 51 supplied to the wind boxes 10a and 10b is jetted from the diffuser tube at the furnace bottom 8 into the furnace. The airflows to the wind boxes 10a and 10b set by the dampers 11a and 11b are defined as F ₁ and F ₂ .
The wind boxes 10a and 10b are each provided with a pressure sensor (not shown) for detecting the pressure in the wind box. The pressure of the wind box 10a _{P 1,} the the _{P 2} pressure windbox 10b.

The gasification furnace main body 2 is filled with fluidized sand supplied from the fluidized sand supply port 6, and a fluidized bed 9 in which the fluidized sand is fluidized by the combustion air 51 supplied from the bottom portion 2 through the wind box 10. Is formed. The fluidized bed 9 during operation is maintained at a temperature of about 500 to 650 ° C. The bed height of the fluidized bed is set according to the moisture evaporation load of the waste. In this embodiment, since the combustion air 51 may not be supplied when the fluidized bed gasification furnace 1 is started up, the fluidized bed 9 at the time of startup includes a case where the fluidized bed 9 is stationary. In FIG. 1A, the bed height of the fluidized bed 9 at the time of start-up is indicated by H ₀ , and the bed height of the fluidized bed 9 at the time of operation is indicated by H ₁ .

Fluidized bed at the time of start-up of the gasification furnace 1, supplying the fluidized sand from previously fluidized sand supply port 6 into the furnace, filling at least until the bed height H _0. Then, the start burner 7 is ignited to start the temperature increase, and the fluidized sand is additionally supplied while the temperature is increased. At this time, supply of the combustion air 51 to the wind box 10 is also started. Finally, supplies fluidized sand until a predetermined bed height H ₁ in a fluidized state.
The fluidized bed 9 at the time of operation is in a fluidized state, and the input waste 50 is dried and thermally decomposed in the fluidized bed 9. The bed height of the fluidized bed 9 is determined by the pressures P ₁ and P ₂ of the wind box 10. During operation, the fluidized sand may be discharged together with the incombustible material 52, or may be accompanied by the pyrolysis gas 53 and escape to the melting equipment side, which may reduce the bed height. Therefore, when the pressure value of the wind box 10 becomes a predetermined value or less, additional fluidized sand is supplied.

Further, as a characteristic configuration of the present embodiment, at least one temperature sensor 23 located in the fluidized bed at the time of start-up is included, and a plurality of temperature sensors 23, 24, 25 installed in the depth direction of the fluidized bed 9 are used. And a second temperature sensor group including a plurality of temperature sensors 21, 24, and 22 installed in the direction in which the wind boxes 10 are arranged. It is preferable to use a thermocouple or the like as the temperature sensor. The temperatures detected by the respective temperature sensors 21 to 25 are represented by T _{1 to} T ₅ . Preferably, the second temperature sensor group divides the fluidized bed 9 into three strip regions in the direction in which the wind boxes 10 are arranged, and is arranged so that at least one temperature sensor exists in each strip region.

Of the first temperature sensor group, the temperature sensor 23 present in the fluidized bed at the time of startup mainly detects the start of fluidization at the time of startup. This is because the fluidized bed temperature rises after the start of fluidization than before the start of fluidization, and therefore the start of fluidization can be determined by detecting this temperature change.
Further, the first temperature sensor groups 23, 24, and 25 mainly detect the fluidized state of the fluidized bed 9 in the height direction and the depth direction. As described above, the bed height of the fluidized bed 9 can also be detected by the air box internal pressure. However, when fluidization failure such as blockage of the air diffuser occurs, the bed height cannot be obtained from the air box internal pressure. Therefore, an accurate layer height can be obtained by simultaneously detecting the layer height even in the first temperature sensor group.

A plurality of second temperature sensor groups 21, 24, and 22 are installed at a predetermined interval in the arrangement direction of the wind boxes 10, with the installation height in the depth direction of the fluidized bed 9 being substantially the same. A temperature distribution in the horizontal cross section of the fluidized bed 9 is obtained by the second temperature sensor group. A local flow failure can be detected by comparing this temperature distribution with the temperature distribution during steady operation. For example, when a partial low-temperature location exists in the obtained temperature distribution, it is determined that the fluidized bed 9 located at this low-temperature location has poor flow. For example, when the temperature T ₄ detected by the temperature sensor 24 shows a value lower than the temperatures T ₁ and T ₂ detected by other temperature sensors, the vicinity of the temperature sensor 24 is locally defective. You can see that Similarly, in the first temperature sensor groups 23, 24, and 25, since the temperature distribution in the depth direction of the fluidized bed is obtained, a flow failure in the depth direction can be detected.
Therefore, by installing the second temperature sensor groups 21, 24, and 22, it is possible to easily identify the defective flow region in real time.

  As described above, according to the configuration of the present embodiment, the bed height and the fluid state of the fluidized bed 9 can be easily grasped by the first temperature sensor groups 23, 24, 25 installed in the depth direction of the fluidized bed 9. In addition, the second temperature sensor group 21, 24, 22 installed in the direction in which the wind boxes 10 are arranged can easily identify the location where the flow failure has occurred, so the fluidized bed state can be grasped in real time with a simple configuration. It becomes possible to do.

Furthermore, in this embodiment, when it is detected that a local flow failure has occurred during the steady operation of the fluidized bed gasifier 1, the flow failure is eliminated.
As one of the causes of the poor flow, it is conceivable that the pressure loss becomes large due to the obstruction of the diffuser pipe and the combustion air 51 required for fluidization is not supplied.
As described above, when the flow failure portion is specified by the second temperature sensor, the air volume of the wind box 10 located below the flow rate is increased from that in the steady operation, and the flow is positively generated. As shown in the figure, when the combustion air supply mechanism is configured by the pushing fan 12 and the dampers 11a and 11b, an operation for changing the air volume balance of the dampers 11a and 11b is performed. In this way, by increasing the air volume at the poorly flowable portion, the obstruction is blown off and the flow is recovered.

It is preferable to confirm whether or not the flow has recovered by looking at the pressure P ₁ or P ₂ of the wind box 10. When the flow failure occurs, the pressure of the wind box 10 located below the value is higher than that in the steady operation. Accordingly, the air box pressure is detected while performing the recovery operation, and it is determined that the flow has been recovered when the air box pressure decreases. When the flow is restored, the air volume to the wind box 20 is returned to the value at the time of steady operation.
Alternatively, the flow rate may be returned to the value at the time of steady operation after a predetermined time has elapsed from the increase in the flow rate of the wind box 10 without detecting the recovery of the flow.
According to this configuration, even if a flow failure is detected, it is possible to quickly eliminate the flow failure by controlling the air volume to the wind box 10 and stabilize the flow state.

Furthermore, as an example of the arrangement of the first and second temperature sensors, as shown in FIG. 1B, at least one temperature sensor of the first temperature sensors 23, 24, 25, or the second temperature sensor. 24 may be installed in the flow failure frequent occurrence region 9b of the fluidized bed 9. The flow failure frequent occurrence region 9b is caused by the structure of the fluidized bed gasification furnace 1, but the falling position 9a of the fluid sand supplied from the fluid sand supply port 6 or its vicinity is considered as a part where the fluid failure is particularly likely to occur. It is done. Therefore, it is preferable to arrange the temperature sensor with this range as the poor flow occurrence region 9b.
Further, at this time, it is preferable to provide the fluid sand supply port 6 at a position close to one side wall of the gasification furnace main body 2, whereby the falling position 9 a of the fluid sand becomes a position near the side wall, and the temperature sensor can be easily installed. Become.

BRIEF DESCRIPTION OF THE DRAWINGS The structure of the fluidized bed gasification furnace which concerns on the Example of this invention is shown, (a) is a sectional side view, (b) is XX sectional drawing of (a). It is a whole lineblock diagram showing the outline of a gasification fusion system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluidized bed gasification furnace 2 Gasification furnace main body 3 Waste supply port 6 Fluidized sand supply port 8 Furnace bottom 9 Fluidized bed 9a Fluidized sand fall position 9b Flow failure frequent occurrence area 10, 10a, 10b Wind box 11a, 11b Damper 12 Push Fans 21 to 25 Temperature sensor 32 Melting facility 33 Swivel melting furnace 34 Secondary combustion chamber 35 Boiler H ₀ Start up bed height H ₁ Run up bed height

Claims (8)

A fluidized bed gasification furnace for thermally decomposing waste to generate pyrolysis gas, having a plurality of juxtaposed air boxes at the lower part of the furnace, and combustion air supplied into the furnace through the air box In a fluidized bed gasification furnace in which a fluidized medium is fluidized to form a fluidized bed,
A first sensor group comprising at least one temperature sensor located in the fluidized bed when the fluidized bed gasifier is started up, and comprising a plurality of temperature sensors installed in the depth direction of the fluidized bed;
A fluidized bed gasification furnace comprising: a second temperature sensor group including a plurality of temperature sensors installed in a direction in which the wind boxes are arranged.   The fluidized bed is divided into three strip regions in the direction in which the wind boxes are arranged, and in the second temperature sensor group, at least one temperature sensor is arranged in each strip region. Item 2. A fluidized bed gasifier according to item 1.   The air temperature control means for detecting the temperature distribution of the horizontal section of the fluidized bed by the second temperature sensor group and controlling the amount of combustion air supplied to the wind box based on the detected temperature distribution. The fluidized bed gasifier according to claim 1.   The at least one temperature sensor in the second temperature sensor group is installed at or near the dropping position of the fluidized medium when the fluidized medium is supplied to the fluidized bed. The fluidized bed gasifier according to claim 1.   The falling position of the fluidized medium when the fluidized medium is supplied to the fluidized bed is a position close to the side wall of the fluidized bed gasification furnace, and the first temperature sensor group is the position where the fluidized medium is dropped or dropped. 2. The fluidized bed gasifier according to claim 1, wherein the fluidized bed gasifier is installed in a depth direction near the position. A fluidized bed gasification furnace for thermally decomposing waste to generate pyrolysis gas, and supplying combustion air into the furnace through a plurality of wind boxes arranged in parallel at the lower part of the fluidized bed gasification furnace In a method for monitoring and controlling a fluidized bed formed by fluidizing a fluid medium with the combustion air,
The fluidized bed is mainly composed of a first sensor group including at least one temperature sensor positioned in the fluidized bed when the fluidized bed gasification furnace is started up, and a plurality of temperature sensors installed in the depth direction of the fluidized bed. Detect the height of the
Detecting a temperature distribution of a horizontal section of a fluidized bed by a second temperature sensor group composed of a plurality of temperature sensors installed in a direction in which the wind boxes are arranged, and mainly identifying a defective flow site based on the detected temperature distribution. A fluid bed monitoring and control method for a fluidized bed gasifier.   The fluidized bed gasifier according to claim 6, wherein when the poor flow region is specified, the amount of combustion air supplied to the wind box located below the poor flow region is temporarily increased. Fluid bed monitoring and control method. 8. The pressure in the wind box is detected after increasing the combustion air supply amount, and the increased combustion air supply amount is restored when the pressure falls within a steady operation range. A fluidized bed gasification furnace fluidized bed monitoring and control method as described.

Images