JPH06300237A - Fluidized bed type combustion method and apparatus - Google Patents

Abstract

PURPOSE:To quickly start up a fluidized bed incinerator and minimize the fuel consumption of auxiliary burners by a method wherein the auxiliary burners having specified capacities are arranged between two or more fluidizing gas blow pipes in a pattern corresponding to the required heat load in a fluidized medium bed. CONSTITUTION:Distribution nozzles 7 are in contact with a fluidized medium bed 6 and blow air to fluidize the fluidized bed 6, and air diffusing pipes 10 also blow fluidizing air through nozzles to fluidize the fluidized bed 6. Auxiliary burners 9 are arranged at selected positions between the air diffusion pipes 10 or between distribution nozzles 7 on the furnace bottom. In the case the fluidized medium bed 6 is divided into sections each having the equal volume to be heated by the auxiliary burners 9, the auxiliary burners 9b have a larger capacity than the auxiliary burners 9a. In the case the auxiliary burners 9 having the same capacity are arranged, the fluidized medium bed 6 is divided into sections having different volumes to be heated by the auxiliary burners 9. Thereby, the combustion efficiency in the fluidized medium bed is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incineration facility for industrial waste, and more particularly, to improve the heating efficiency of a combustion burner provided in a fluidized bed in a fluidized medium, to early start and assist the combustion of a fluidized bed combustion apparatus. The present invention relates to a fluidized bed combustor for industrial waste or the like, which is suitable for saving fuel in a burner.

[0002]

2. Description of the Related Art A conventional fluidized bed incinerator for industrial waste is
For example, as shown in FIG. 10 and FIG. 12, the fluidized medium layer 6 is heated from an auxiliary combustion burner (in-bed burner) 9 provided on the side wall of the furnace to burn the fluidized bed. When incinerating industrial waste such as paper sludge, sewage sludge, and various other sludges, these sludges are dehydrated, and the dehydrated sludges are discharged from the waste input port 2 to a fluidized bed incinerator. The method of throwing in 1 and carrying out fluid combustion and incineration is adopted. This fluidized bed incinerator is suitable for secondary pollution control because of good combustion of waste, less unburned residue, less odor and generation of nitrogen oxides (NOx). Incineration of industrial waste by the furnace 1 is increasing. FIG. 10 is a schematic diagram showing an example of the structure of a conventional fluidized bed incinerator for waste such as papermaking sludge, and FIG. 12 is an example of the structure of a conventional fluidized bed incinerator for waste such as sewage sludge. It is a schematic diagram which shows. Since both of the above fluidized bed incinerators are functionally almost the same, common reference numerals will be used for description. In the figure, fluidized bed incinerator 1
The outer shell is made of steel plate, and the inner shell is made of refractory brick, heat insulating brick, castable alumina and the like. Then, dewatered sludge or the like is input from the waste input port (incinerator input port) 2. The fluidized bed incinerator 1 has an exhaust gas outlet 3,
A viewing window 4 and a secondary air supply port 5 are provided. At the bottom of the fluidized bed incinerator 1, a fluidized medium layer 6 is formed of silica sand or the like,
A fluidized bed combustion unit is configured. And the fluid medium layer 6
In the state where the temperature is preheated to 750 ° C. to 850 ° C., dehydrated sludge or the like is put into the fluid medium layer 6 from the waste inlet 2 and mixed with the fluid medium to be combusted in the fluidized bed. A plurality of dispersion nozzles 7 are provided in contact with the fluidized medium layer 6,
The flowing air is jetted to flow the flowing medium, and the air diffuser 10 also has the same function as the dispersion nozzle 7. Air heated by an air preheater (not shown) is fed into the wind box 8. The auxiliary burner 9 is a fluidized medium layer 6
It is used to raise the temperature and to assist the burning of incinerated materials. Although not shown, a startup burner is installed above the fluidized medium layer 6, and when the bed temperature of the fluidized medium layer 6 rises to about 500 ° C., the auxiliary combustion burner 9 is used to increase the bed temperature. The temperature is further raised to about 750 ° C, and the incineration of the incinerated substances is started. The slide gate damper 11 is provided on the upper part of the device 12 for extracting fluid media, incineration materials, and foreign matter. 11 and 13 are views showing an example of the arrangement of the auxiliary combustion burner 9, and the arrow A indicates the injection direction of fuel from the auxiliary combustion burner 9. The material to be incinerated introduced from the waste introduction port 2 is fluidized and burned in the fluidized medium layer 6 at 750 ° C to 850 ° C. At this time, the air diffuser 1 by the FDF (forced blower)
0 or preheated air sent to the wind box 8 is jetted from the dispersion nozzle 7 or the diffuser pipe 10 to flow the fluidized medium layer 6 to effectively perform fluidized bed combustion. In the fluidized medium layer 6, the industrial waste that is the incineration object is dried, the dried waste is burned, and the combustible gas generated by the combustion is burned at the same time. The combustible gas that could not be combusted in the fluidized medium layer 6 is combusted by the secondary air from the secondary air supply port 5 and discharged from the exhaust gas outlet 3 to the outside of the furnace. However, in the auxiliary combustion burner 9 on the side wall of the conventional fluidized bed incinerator 1, as shown in FIG. 14, for example, the flame of the auxiliary combustion burner 9 is burned at a position about 30 cm from the side wall of the furnace to form the fluidized medium layer 6
Of the fluidized medium layer 6 is extremely poor, and the bed temperature distribution of the fluidized medium layer 6 is as shown in, for example, FIG. Since it is low, it is difficult to start the fluidized bed combustion at an early stage, and the auxiliary burner 9 requires a large amount of fuel, which is extremely uneconomical. And, in that the combustion effect of the auxiliary combustion burner 9 in the fluidized medium layer 6 is improved, that is, when the industrial waste incineration facility is started, early fluidized bed combustion can be started, and the heating efficiency by the auxiliary combustion burner can be improved. Conventionally, no consideration has been given to the reduction of the amount of fuel oil to be raised. Note that as conventional techniques for incineration of wastes and the like in a fluidized bed, for example, JP-A-57-74579 and JP-A-58-1753.
42 and Japanese Utility Model Laid-Open No. 59-92310.

[0003]

As described above, according to the prior art, since the auxiliary combustion burner for combusting the industrial waste and the like in the fluidized bed is provided on the side wall of the furnace, the bed in the fluidizing medium of the auxiliary combustion burner flame is formed. The internal retention time is short, the heating efficiency is poor because it does not reach the center of the bed, and it takes a long time to raise the temperature of the fluidized medium bed, which delays the start of waste incineration operation.
In addition, there is a problem that the fuel consumption of the auxiliary burner increases and the running cost increases.

An object of the present invention is to solve the above problems in the prior art, in which a plurality of auxiliary burners arranged in the fluidized medium layer are provided inside the fluidized medium layer or at the bottom of the furnace. Depending on the size of the required heat load in the fluidized medium layer, it is installed at or near the position of the air dispersion nozzle or air diffuser that causes the fluidized medium to flow, and the jet direction of the auxiliary combustion burner flame is directed downward in the layer. Economical fluidized bed combustion of waste by minimizing the fuel consumption of auxiliary combustion burners by increasing the residence time to improve heating efficiency, enabling early startup of fluidized bed incinerators for industrial waste, etc. A method and an apparatus therefor are provided.

[0005]

In order to achieve the above object of the present invention, a plurality of auxiliary burners provided in the fluidized medium bed of a fluidized bed combustor for waste are not arranged in the side wall of the furnace. The auxiliary combustion burner is placed in or near an air dispersion nozzle, which is a gas injection pipe for flowing a fluidized medium, or an air diffuser, and the fuel oil of the auxiliary combustion burner is introduced into a portion of the fluidized medium layer where the heat load required is large. Either set a large amount of heat or set the arrangement pattern of the auxiliary combustion burners densely, and make the direction of the injected oil from the auxiliary combustion burners downward to increase the residence time in the auxiliary combustion burner flame in the layer and to move the waste etc. This is an economical fluidized bed combustion method that improves bed combustion efficiency, enables early start-up of fluidized bed incinerators for industrial waste, etc., and minimizes fuel consumption of the auxiliary burner. is there. According to the present invention, in a fluidized medium layer, at least a plurality of flow gas ejection pipes having gas ejection ports for flowing the fluidized medium and a plurality of auxiliary combustion burners for heating the fluidized medium layer are arranged. In a fluidized bed combustion method in which waste, which is an object to be incinerated, is put into a bed and burned in a fluidized bed to incinerate the waste, in the fluidized medium bed, fuel is supplied to the plurality of fluid gas jet pipes or in the vicinity thereof. This is a fluidized bed combustion method in which an auxiliary combustion burner having a predetermined capacity to be injected and heated into the fluidized bed is arranged in a layout pattern according to the required heat load capacity in the fluidized medium bed to perform fluidized bed combustion. Further, in the fluidized bed combustion method, the present invention provides an auxiliary combustion burner for injecting fuel into the fluidized medium layer to heat the fluidized gas ejection pipes or in the vicinity thereof, and Is a fluidized bed combustion method in which the capacity of the auxiliary combustion burner is set according to the required heat load capacity and the amount of fuel corresponding to the required heat load capacity is supplied to the auxiliary combustion burner for control. Further, it is preferable that the auxiliary combustion burner is arranged in an arrangement pattern of a setting selected from an air dispersion pipe or an air dispersion nozzle that is a flow gas ejection pipe. Further, according to the present invention, in the fluidized medium layer, a plurality of gas jetting pipes for flowing having a gas jetting port for flowing the fluidized medium and a plurality of auxiliary combustion burners for heating the fluidized medium layer are arranged, In a fluidized bed combustor that incinerates waste by injecting waste to be incinerated into it and burning it in a fluidized bed, the temperature in the furnace, the temperature in the fluidized medium bed, the pressure in the wind box, the nitrogen in the exhaust gas Detects oxide (NOx), carbon monoxide (CO) or oxygen (O ₂ ) concentration,
A means for detecting the operating state of the fluidized bed combustion device, a required time for starting the fluidized bed combustion device, and a temperature rise rate target value of the fluidized medium bed are set, and the temperature rise rate target value and the actually measured temperature rise rate are compared and calculated. The present invention relates to a fluidized bed combustion apparatus including at least means for obtaining the deviation and means for adjusting and controlling the amount of fuel supplied to the auxiliary combustion burner arranged in the fluidized medium layer from the above deviation.

[0006]

In the conventional fluidized bed incinerator for waste, as shown in FIG. 16, for example, since the auxiliary combustion burner is arranged on the furnace side wall of the fluidized bed combustion furnace, the temperature is raised only near the furnace side wall portion. As in the F region shown in FIG. 16 (the larger the fluidized bed incinerator, the larger the F region tends to be), it was difficult to raise the temperature of the fluidized medium layer in the central part of the furnace. In the present invention, an auxiliary combustion burner is attached to an air diffuser nozzle provided in the air diffuser that is a gas jet pipe for flowing or on the furnace bottom side, and the heat input amount of fuel oil increases as the required heat load in the fluidized medium layer increases. Increase or arrange the auxiliary combustion burner according to the required heat load in the fluidized medium layer, and increase the residence time of the auxiliary combustion burner flame by directing the in-layer injection direction of the fuel oil injected from the auxiliary combustion burner downward. By adjusting in this way, it becomes possible to improve the combustion efficiency of the entire fluidized medium layer. As a result, it is possible to solve the problem that the temperature of the fluidized bed combustion incinerator is raised only near the side wall of the furnace and the temperature of the entire fluidized medium bed cannot be raised. The start can be achieved, a large amount of fuel oil is not consumed to raise the temperature of the fluidized medium layer, and economical waste incineration operation can be achieved.

[0007]

Embodiments of the present invention will be described below in more detail with reference to the drawings. FIG. 1 is a schematic view showing an example of the structure of a fluidized bed incinerator (square furnace) for paper sludge, and FIGS. 2 and 3 are views taken along the line AA of FIG. 1 showing the arrangement of the auxiliary burners 9. It is explanatory drawing which shows an example of a combination. In FIG.
9a and 9b show that the capacity of the auxiliary burner is different. The symbols B, C, D and E shown in FIG. 3 indicate the size of the region of the fluidized medium layer 6 in which the auxiliary burner 9 is arranged. 4 is a schematic view showing an example of the structure of a fluidized bed incinerator (round furnace) for sewage sludge, and FIG.
FIG. 6 is a view taken along the line BB of FIG. 4B, which is an explanatory view showing the arrangement of the auxiliary combustion burners 9 provided in the furnace bottom portion, and the auxiliary combustion burners 9 are arranged in a fan-shaped substantially central portion obtained by dividing a circular furnace bottom portion into eight. The round type fluidized bed incinerator 1 is shown. 1 and 4, the fluidized bed incinerator 1 has a steel plate as an outer shell, a refractory brick, a heat insulating brick, and an alumina castable as an inner shell.
Dewatered sludge or the like is input from the incineration object input port 2.
The fluidized bed incinerator 1 is provided with an exhaust gas outlet 3, a viewing window 4, and a secondary air supply port 5. The fluidized medium layer 6 is composed of a fluidized medium such as silica sand. And the auxiliary burner 9
Thus, the fluidized medium layer 6 is heated to a temperature of 750 ° C. to 850 ° C., and then the sludge and the like dehydrated from the waste input port 2 are put into the fluidized medium layer 6 and mixed with the fluidized medium and burned.
The dispersion nozzle 7 is provided in contact with the fluidized medium layer 6,
Air is ejected to flow the fluidized medium layer 6, and the air diffuser 10 also has a function similar to that of the dispersion nozzle 7. The fluidizing air is jetted from the nozzle of the air diffuser 10 to cause the fluidized medium to flow. Is what makes it flow. Preheated air heated by an air preheater (not shown) is introduced into the wind box 8. In this embodiment, all of the auxiliary combustion burners 9 are selected from the diffuser tubes 10 or selected from the dispersion nozzles on the furnace bottom side and arranged. Then, the fuel oil was injected from these auxiliary combustion burners 9 in the furnace bottom direction (direction of arrow A) to lengthen the in-bed residence time to raise the temperature of the fluidized medium layer 6 and assist the combustion of the incineration material. The slide gate damper 11
The fluidized medium, the incinerated foreign matter, and the like are discharged from the extraction device 12 to the outside of the system. FIG. 6 shows an example of the structure of the auxiliary combustion burner 9 of the present invention used in the square furnace.
FIG. 7 shows an auxiliary combustion burner 9 of the present invention used in the round furnace.
2 shows an example of the structure of FIG. In the figure, the direction indicated by arrow A indicates the direction of fuel injection from the auxiliary combustion burner 9. In both cases, fuel is injected toward the bottom of the furnace to extend the residence time of the fuel in the fluidized medium layer 6 to increase the auxiliary combustion. It improves efficiency. The incinerated substances such as dewatered sludge that are input from the waste input port (incinerator input port) 2 are 75
It is mixed in the fluidized medium layer 6 at a temperature of about 0 ° C. to 850 ° C. and incinerated by fluidized combustion. At this time, the preheated air sent to the air diffuser 10 or the wind box 8 by the FDF is jetted from the respective dispersion nozzles 7 or the air diffusers 10 to flow the fluidized medium layer 6 to effectively incinerate the waste. To do. 750 ° C
In the fluidized medium layer 6 at a temperature of up to 850 ° C., the incineration object is dried, the dried incineration object is burned, and the combustible gas generated by the combustion of the incineration object is simultaneously burned. The combustible gas that has not been completely burned in the fluidized medium layer 6 is burned by the secondary air from the secondary air supply port 5, and the exhaust gas outlet 3
Is discharged from the furnace. In the conventional fluidized bed incinerator, the fluidized bed incinerator is started to operate after the bed temperature is heated to about 500 ° C. by heating with the auxiliary combustion burner, and as shown in FIGS. It takes a considerably long time to raise the temperature of only the fluidized bed on the side wall of the furnace to raise the temperature of the entire fluidized medium layer 6 to about 750 ° C., and a large amount of fuel oil is added to the auxiliary burner. However, as in the fluidized bed incinerator shown in the present embodiment, a portion of the fluidized medium layer 6 having a large required heat load (because the vicinity of the furnace side wall requires heat energy to raise the temperature of the furnace side wall as compared with the central part of the furnace). The larger the required heat load is, the larger the heat input amount of the fuel oil of the auxiliary combustion burner is made to correspond to the required heat load of the fluidized medium layer. That is,
When the heating volume of the fluidized medium layer 6 by the auxiliary combustion burner is equally divided, the auxiliary combustion burner 9 capacity is increased to 9a <9b as shown in FIG. 2, and the auxiliary combustion burner 9 having the same capacity is arranged. When the fluidized medium layer 6 is installed, the heating volume of the fluidized medium layer 6 by the auxiliary combustion burner is changed. Further, regardless of the size of the auxiliary combustion burner 9 and the size of the heating volume of the fluidized medium layer 6 which is in charge of the auxiliary combustion burner 9, the direction of fuel injection from the auxiliary combustion burner 9 is that the flowing air flowing through the fluidized bed flows from bottom to top. Therefore, the fuel was injected in the furnace bottom direction (the direction of arrow A) so as to set the in-layer residence time of the auxiliary burner flame to be long, and the combustion efficiency in the fluidized medium layer was improved. Next, the automatic control of the fluidized bed combustion apparatus for wastes of the present invention will be described with reference to FIG. In the figure, various sensors (detectors) 13 are arranged around the fluidized bed incinerator 1, and the temperature inside the furnace is F ₁ , the O ₂ concentration in the exhaust gas is F ₂ , the NOx concentration in the exhaust gas is F ₃ , CO concentration in exhaust gas; F ₄ , temperature in fluidized medium bed; B ₁ ,
B _2, the pressure of the windbox; measured B _3, etc., to record the operating conditions of the fluidized bed combustion system. The signal of each of the above measured values is input as a detection signal to the calculator 16 via the circuit 14. Necessary data is extracted by the detector (M) of the arithmetic unit 16, and the operating state display arithmetic unit (CO), the required start-up time of the fluidized bed combustion device and the temperature rise rate target value (set value) in the fluidized medium bed are displayed. A temperature rise rate comparison display calculator (COM) for setting and comparing the preset temperature rise rate set value with the actually measured temperature rise rate calculates the deviation between the temperature increase rate set value and the actually measured temperature rise rate. However, the amount of fuel supplied to each auxiliary burner is adjusted and controlled based on the deviation. Figure 9
An example of the temperature increase rate comparison display model is shown in FIG. The broken line shows the temperature rise rate set value, and the solid line shows the actually measured temperature rise rate.
Then, the temperature increase rate set value and the actually measured temperature increase rate are compared, and the ± temperature increase rate (deviation) is input as a fuel control signal 18 via the controller 17, and fuel adjustment is operated by the terminal device. It is automatically controlled so as to be in a normal operating state. The minimum and maximum fuel supply amounts were set in advance and the fuel supply amount was set within that range. As an example of the round furnace of the fluidized bed combustion apparatus of the present invention, the auxiliary combustion burner is not arranged in the central portion of the fluidized medium layer, but the auxiliary combustion burner is arranged in the central portion to flow other auxiliary combustion burners. It may be arranged as a uniform volume division of the medium layer,
The same effect as in the above embodiment can be obtained. Further, as shown in the example of the rectangular furnace, the heat input amount is controlled by adjusting the capacity of the auxiliary combustion burner provided in the central portion of the fluidized medium layer and the capacity of the auxiliary combustion burner provided in the side wall of the furnace to control the heat input amount so that the fluidized medium layer is evenly distributed. Even if the heating is performed or the heating volume of the fluidized medium layer supported by the auxiliary combustion burner is adjusted to evenly heat the fluidized medium layer, the same effect as that of the above-described embodiment can be obtained. Further, the auxiliary combustion burner may be attached to the air dispersion nozzle or the air diffusing pipe by screwing or by attaching a bolt or nut by a flange. In the present embodiment, an example in which the auxiliary combustion burner is vertically arranged from the air diffuser is shown, but in some cases, the auxiliary air burner is penetrated into the fluidized bed at an arbitrary angle up to the position of the combined arrangement of the auxiliary burners, and the final It may be arranged vertically in the fluidized bed which is required in particular.

[0008]

As described in detail above, according to the method for fluidized combustion of industrial wastes and the like according to the present invention, an air diffuser for flowing a fluidized medium through an auxiliary combustion burner, an air dispersion nozzle provided on the furnace bottom side, or the same. It is arranged in the vicinity so that the fluidized medium layer is heated uniformly, the heat input amount of the fuel is adjusted according to the required heat load of the fluidized medium layer, and the fuel injection direction from the auxiliary combustion burner is adjusted. The heating efficiency in the fluidized-medium layer can be improved by injecting the fluidized-bed medium downward so as to adjust the residence time of the supplementary burner flame in the fluidized-medium layer to be long. Therefore, unlike the conventional fluidized bed incinerator, the problem that the temperature near the furnace side wall only rises and the temperature of the central part of the fluidized medium layer does not rise easily is solved, and early incineration operation of waste etc. can be started. It is possible to reduce the consumption of fuel supplied to the auxiliary combustion burner.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of the configuration of a fluidized bed incinerator (square furnace) exemplified in an embodiment of the present invention.

FIG. 2 is an explanatory view showing an example of an arrangement configuration based on the capacity of the auxiliary burner in the AA arrow view of FIG. 1.

FIG. 3 is an explanatory diagram showing an example of an arrangement configuration based on the heating volume of the auxiliary combustion burner in the AA arrow view of FIG. 1.

FIG. 4 is a schematic diagram showing an example of the configuration of a fluidized bed incinerator (round furnace) exemplified in the examples of the present invention.

5 is an explanatory view showing an example of an arrangement configuration based on the heating volume of the auxiliary burner in the BB arrow view of FIG. 4. FIG.

FIG. 6 is a schematic diagram showing an example of the structure of an auxiliary combustion burner of the fluidized bed incinerator (square furnace) exemplified in the embodiment of the present invention.

FIG. 7 is a schematic diagram showing an example of a structure of an auxiliary combustion burner of a fluidized bed incinerator (round furnace) exemplified in the embodiment of the present invention.

FIG. 8 is an explanatory diagram showing an example of an automatic temperature rising control method for the fluidized bed incinerator illustrated in the embodiment of the present invention.

9 is a graph showing an example of a temperature rising rate model of a fluidized medium layer by the automatic temperature rising control method shown in FIG.

FIG. 10 is a schematic diagram showing an example of the configuration of a conventional fluidized bed incinerator (square furnace).

FIG. 11 is a view on arrow CC of FIG.

FIG. 12 is a schematic diagram showing an example of the configuration of a conventional fluidized bed incinerator (round furnace).

13 is a view on arrow D-D of FIG.

FIG. 14 is a schematic diagram showing a state of an auxiliary burner flame of a conventional fluidized bed incinerator.

FIG. 15 is an explanatory view showing a temperature distribution and a furnace state of a fluidized medium layer by heating of a conventional auxiliary burner.

FIG. 16 is a schematic diagram showing an arrangement configuration of auxiliary combustion burners in a fluidized medium layer of a conventional fluidized bed incinerator (square furnace).

FIG. 17 is a schematic diagram showing an example of the structure of a conventional auxiliary combustion burner.

[Explanation of symbols]

 1 ... Fluidized bed incinerator 2 ... Waste input port (incinerator input port) 3 ... Exhaust gas outlet 4 ... Peep window 5 ... Secondary air supply port 6 ... Fluid medium layer 7 ... Dispersion nozzle 8 ... Wind box 9, 9a , 9b ... Auxiliary burner (in-bed burner) 10 ... Air diffuser 11 ... Slide gate damper 12 ... Extractor device 13 ... Sensor (detector) 14 ... Circuit 15 ... Measured value 16 ... Arithmetic unit 17 ... Controller 18 ... Fuel control signal 19 ... Auxiliary burner flame 20 ... Furnace wall 21 ... Furnace bottom

Claims (4)

[Claims] 1. A fluidized medium layer having at least a plurality of fluidizing gas jetting pipes each having a gas jetting port for fluidizing the fluidized medium and a plurality of auxiliary burners for heating the fluidized medium layer. In a fluidized bed combustion method of injecting waste, which is an object to be incinerated, into a medium layer to combust the fluidized bed to incinerate the waste, in a plurality of fluid gas jet pipes or in the vicinity thereof, fuel is fluidized medium layer. A fluidized bed combustion method, characterized in that a prescribed volume of auxiliary combustion burners that are injected and heated inside are arranged in a pattern according to the required heat load in the fluidized medium bed to perform fluidized bed combustion. 2. At least a plurality of flowing gas ejection pipes having a gas ejection port for flowing the fluidized medium and a plurality of auxiliary combustion burners for heating the inside of the fluidized medium layer are provided in the fluidized medium layer, and the above-mentioned flow is provided. In a fluidized bed combustion method of injecting waste, which is an object to be incinerated, into a medium layer to combust the fluidized bed to incinerate the waste, in a plurality of fluid gas jet pipes or in the vicinity thereof, fuel is fluidized medium layer. An auxiliary combustion burner for injecting and heating is provided inside, and the capacity of the auxiliary combustion burner is set according to the size of the required heat load in the fluidized medium layer, and the amount of the auxiliary combustion burner is adjusted according to the required heat load. A fluidized bed combustion method characterized by supplying and controlling fuel. 3. The auxiliary burner according to claim 1 or 2, wherein the auxiliary burners are arranged in a layout pattern selected from a plurality of air dispersion pipes or air dispersion nozzles, which are flow gas ejection pipes. And a fluidized bed combustion method. 4. At least a plurality of flowing gas ejection pipes having a gas ejection port for flowing the fluidized medium and a plurality of auxiliary combustion burners for heating the inside of the fluidized medium layer are provided in the fluidized medium layer, and the above-mentioned flow is provided. In a fluidized bed combustor that incinerates waste by injecting waste to be incinerated into the medium bed and burning it in a fluidized bed, the temperature inside the furnace, the temperature inside the fluidized bed, the pressure in the wind box, and the exhaust gas Nitrogen oxides (NOx), carbon monoxide (C
O) or oxygen (O ₂ ) concentration to detect the operating state of the fluidized bed combustor, the time required to start the fluidized bed combustor, and the temperature rise rate target value of the fluidized medium bed. A means for comparing and calculating the temperature rise rate target value and the actually measured temperature rise rate to obtain the deviation, and means for adjusting and controlling the fuel supply amount to the auxiliary combustion burner arranged in the fluidized medium layer from the above deviation. A fluidized bed combustion device characterized by being provided.