JPH10300047A - Temperature control method of fluidized bed pyrolysis furnace, waste pyrolysis furnace, and waste treating equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature control method in which fluidized bed temperature is prevented from being lowered to stably operate a fluidized bed pyrolysis furnace, and provide a waste pyrolysis furnace using the temperature control method, and waste processing equipment. SOLUTION: In a single tower waste pyrolysis furnace where waste is thrown into a fluidized bed and is pyrolyzed and gassified, there is provided means in which part of a combustible component such as pylorysys gas produced from a fluidized bed FD is combusted and combustion heat thereof is provided to the fluidized bed. The means comprises a nozzle 116 provided penetrating a furnace wall surrounding the fluidized bed FD, directed toward an upper surface of the fluidized bed, gas supply means 118, 119 for supplying partial combustion gas to the nozzle, flow rate regulating means 120, 121 for regulate a gas flow rate supplied to the nozzle 116.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pyrolysis method for introducing combustibles such as industrial waste, municipal solid waste, and coal into a fluidized bed pyrolysis furnace to pyrolyze and gasify the waste, and a pyrolysis of waste using the pyrolysis gas. The present invention relates to a furnace, and further relates to a waste treatment facility for burning and melting ash containing combustibles and char at a high temperature by using a combustible gas generated by thermal decomposition.

[0002]

2. Description of the Related Art In recent years, the amount of municipal solid waste disposal has been increasing steadily, and it has become increasingly difficult to secure land for landfill disposal. In addition, groundwater is contaminated in landfill treatment, and under the situation where laws and regulations for preventing environmental pollution are being strengthened, studies are being made on, for example, volume reduction and fixation by melting waste. In addition, as seen in the Recycling Law, effective resource recovery, recovery of unused energy, recycling of processed materials, etc. have been promoted, and efforts for effective use of waste have been strengthened. Furthermore, there are many issues required for waste treatment, such as the control of trace contaminants such as dioxins, for the stable treatment of harmful substances.

Under these circumstances, waste is introduced into a fluidized bed to generate pyrolysis gas, the pyrolysis gas is burned at high temperature to decompose trace contaminants, and the heat of combustion is used to generate external energy. Attention has been focused on a process for melting ash without using ash.

[0004] The term "pyrolysis" as used herein refers to an operation of heating waste to a high temperature in an oxygen-free or low-concentration oxygen atmosphere, and in a so-called fluidized bed incinerator in which sludge or the like is burned at 750 to 1000 ° C. Unlike the exothermic reaction, the upper limit of the heating temperature is limited to approximately 650 ° C. to perform the thermal decomposition reaction.

[0005] Generally, when thermal decomposition of organic waste is carried out, a combustible gas containing hydrogen, carbon monoxide, hydrocarbons, etc., char and ash are produced. The advantages of performing pyrolysis in this way are (a) recoverable fuel that can be stored and transported, and (b) relatively slow reaction,
It can absorb fluctuations in waste quality and supply amount of waste, (c) The amount of NOx generated is relatively low due to relatively low temperature, and (d) the amount of generated gas is significantly smaller than the amount of incineration exhaust gas. Small size, (e) Valuable metals can be recovered in an unoxidized state without melting by low-temperature pyrolysis.
F) Dry distillation or partial combustion in the pyrolysis furnace can increase the load of waste input into the pyrolysis furnace.

[0006] When the melting process is combined with the above-mentioned thermal decomposition, the following advantages are obtained. In other words, (g) the ash can be melted using the energy of the waste, and (h) the combustion air to be introduced into the melting furnace is low in air ratio. The equipment can be made more compact, and (iii) the amount of trace harmful substances such as dioxins generated by high-temperature combustion in a melting furnace can be reduced.

[0007] In a fluidized bed pyrolysis-melting process using a fluidized bed for pyrolysis, waste is introduced into a fluidized bed of a fluidized bed pyrolysis furnace and gas is circulated in a fluidized bed together with a fluidized medium such as sand. Be transformed into At this time, the amount of air supplied to the pyrolysis furnace is set to 30 to 40% or less of the theoretical air amount, and the fluidized bed temperature is set to 450 to 650 ° C. so that the generated gas contains a large amount of combustible components. ing. That is, the fluidized bed temperature is set to a range not lower than the lower limit temperature necessary for obtaining good thermal decomposition and not higher than the upper limit temperature at which aluminum as a valuable metal can be recovered without being melted and oxidized.

Then, the combustible gas, char, and ash generated in the pyrolysis furnace are successively introduced into a subsequent melting combustion furnace,
High-temperature combustion is performed at a low air ratio of about 1.3, whereby ash is melted. That is, by combining a fluidized bed pyrolysis furnace and a melting combustion furnace,
A method of treating waste without using external energy is realized. Exhaust gas sent from the melting and burning furnace is recovered by a waste heat boiler and an air preheater, and then discharged to the atmosphere via an exhaust gas treatment device.

[0009]

In the fluidized bed pyrolysis furnace described above, in order to continuously carry out the thermal decomposition, it is necessary to stably flow the fluidized medium while maintaining a low air ratio and an appropriate sand layer temperature. There is. However, the calorific value of the waste is not always constant, and a waste with a low calorific value may be supplied. Under such operating conditions, it is difficult to maintain an appropriate sand layer temperature. In addition, factors that make it impossible to maintain the sand layer temperature properly include a change in waste quality and a change in supply amount. In addition, since the properties of the pyrolysis gas are greatly affected by the temperature of the sand layer, the stable operation of the melting and burning furnace, which is located downstream of the fluidized bed pyrolysis furnace and uses the pyrolysis gas as energy, is required. However, it is extremely important to stabilize the sand layer temperature.

The present invention has been made to solve the problems in such a conventional fluidized bed pyrolysis-melting process, and stably performs thermal decomposition while preventing a fluidized bed temperature from lowering. A method for controlling the temperature of a fluidized bed pyrolysis furnace capable of burning and melting ash at a high temperature using a pyrolysis gas having stable components, a waste pyrolysis furnace, and a waste treatment facility It is.

[0011]

According to the temperature control method for a pyrolysis furnace of the present invention, a fluid medium is charged into a furnace provided with a gas dispersion plate at the bottom, and the gas is fed from below the gas dispersion plate to remove the fluid medium. In the pyrolysis method of fluidizing and supplying a substance to be burned to a fluidized bed in a fluidized state and pyrolysis gasification, a combustion gas is supplied toward the upper surface of the fluidized bed and pyrolysis generated from the fluidized bed The gist of the present invention is to prevent a decrease in the temperature of a fluidized bed by burning a part of a combustible component such as gas and giving the combustion heat to the fluidized bed.

In the waste pyrolysis furnace of the present invention, a fluid medium is filled in a furnace provided with a gas dispersion plate at the bottom, and a gas is sent from below the gas dispersion plate to fluidize the fluid medium to be fluidized. In a single-column waste pyrolysis furnace that supplies waste to the fluidized bed in the state and pyrolyzes it into gas, a part of combustible components such as pyrolysis gas generated from the fluidized bed are burned, and the combustion heat is reduced. The gist of the invention is to provide a fluidized bed temperature control means for preventing the temperature of the fluidized bed from lowering by giving the fluidized bed.

The fluidized bed temperature control means includes a nozzle provided through a furnace wall surrounding the fluidized bed, a gas supply means for supplying a combustion gas to the nozzle, and a gas flow rate supplied to the nozzle. Flow rate adjusting means. Further, it is preferable that the nozzle is arranged so that the combustion gas is blown toward the upper surface of the fluidized bed.

Further, a waste pyrolysis furnace having the above-described structure, and a melt combustion for receiving a supply of a pyrolysis gas sent from the waste pyrolysis furnace to perform high-temperature combustion to melt ash in the pyrolysis gas By providing a furnace, a waste treatment facility can be configured.

According to the temperature control method for a fluidized bed pyrolysis furnace of the present invention, for example, when a fluidized bed having a low calorific value is supplied and the temperature of the fluidized bed decreases, a combustion gas is supplied into the fluidized bed. Some of the combustible components such as pyrolysis gas generated from the fluidized bed are burned by the supplied combustion gas, and the heat of combustion is absorbed by the fluidized bed to increase the temperature of the fluidized bed.

According to the waste pyrolysis furnace of the present invention, when waste having a low calorific value is introduced into the fluidized bed, the fluidized bed temperature control means supplies the combustion gas from the nozzle toward the upper surface of the fluidized bed. By doing so, a part of the combustible components generated from the fluidized bed is burned and acts to maintain an appropriate thermal decomposition temperature.

According to the waste treatment equipment of the present invention, the temperature of the fluidized bed is stabilized because the temperature of the waste pyrolysis furnace is prevented from lowering, whereby the composition of the pyrolysis gas generated in the pyrolysis is stabilized. Therefore, the combustion in the melting and burning furnace provided at the subsequent stage of the fluidized bed pyrolysis furnace is stabilized, and the melting and burning furnace can be operated stably.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a waste pyrolysis furnace in which the temperature control method for a fluidized bed pyrolysis furnace according to the present invention is used, and a waste combustion furnace having a configuration in which a melting combustion furnace is connected to the latter stage of the waste pyrolysis furnace. 1 shows the overall configuration of a material processing facility.

The waste treatment equipment shown in FIG. 1 includes a dust feeder 10, a fluidized bed pyrolysis furnace 11,
It is provided with a melting and burning furnace 12, a heat exchanger 13, a waste heat boiler 14, a gas cooling chamber 15, a bag filter 16, and an exhaust fan (induction blower) 17. From 7, wastes scooped by the garbage crane 8 are supplied. The refuse crane 8 is operated by an operator in the crane operation room 9.

An incombustible discharge device 18 having a screw feeder 18a built therein is provided below the waste pyrolysis furnace 11, and is separated by a separation device and a magnetic separation device (not shown) attached to the incombustible discharge device 18. Impurities, non-ferrous metals, and iron are recycled and used,
The sand is returned to the fluidized bed of the waste pyrolysis furnace 11.

At the lower part of the melting and burning furnace 12, a conveyor 19 is provided.
a slag unloading device 19 which incorporates a screw conveyor 20a below the slag unloading device 19.
And a water sealing tank 20 for collecting molten slag. The molten slag obtained from the water sealing tank 20 is also recycled.

The molten fly ash recovered from the waste heat boiler 14 and the bottom of the gas cooling chamber 15 is supplied to a molten fly ash heavy metal recovery device 25, and the recovered heavy metals such as Cu, Pb, Zn, etc. To be recycled for refining. In addition, the molten fly ash heavy metal recovery device 25
The wastewater separated from the wastewater is recycled through a wastewater treatment facility 26 and a salt recovery facility 27.

Further, harmful components such as dioxin contained in the exhaust gas from the bag filter 16 are sent to the heater 21 by the exhaust fan 17, heated to satisfy the reaction conditions, and then supplied to the catalytic reaction tower 22. After the harmful components are removed, they are released from the chimney 23 into the atmosphere. Further, the exhaust gas sent from the bag filter 16 is branched and provided to the circulation fan 24, and the exhaust gas sent from the circulation fan 24 is returned to the fluidizing gas inlet 11 a of the waste pyrolysis furnace 11. Exhaust gas sent out from the heat exchanger 13 is also returned to the fluidizing gas inlet 11a.

The heat recovered by the waste heat boiler 14 is used for power generation and is consumed by the owner or sold. Reference numeral 28 denotes a fan for introducing the intake air from the dust pit into the exhaust gas system.

Next, the configuration of the main part of the waste treatment facility will be described in more detail. FIG. 2 shows the configuration of the waste pyrolysis furnace 11. In the figure, a waste pyrolysis furnace 11 is provided with a dispersion plate 112 having a number of gas injection holes 111 at the bottom thereof, and a wind box 113 below the dispersion plate 112. In the wind box 113, a fluidizing gas inlet 11a is provided.
The fluidizing gas is introduced from. Therefore, the gas injection holes 11 of the dispersion plate 112 are
When the fluidizing gas is injected upward through 1, the sand particles filled on the dispersion plate 112 are fluidized, and a fluidized sand particle layer, that is, a fluidized bed FD is formed.

Fluidized bed FD in waste pyrolysis furnace 11
A waste inlet 114 and a main burner 115 for starting are provided opposite to the waste inlet 114, and a free board unit 1 is provided above the fluidized bed FD.
1b is formed.

In the center of the dispersion plate 112, a cylindrical incombustible discharge passage 1 for discharging incombustibles and valuable metals is provided.
1d is provided, and an incombustible discharge device 18 is disposed at the outlet thereof. The incombustible discharge device 18 includes:
A screw conveyor 18a and a vibration sieving device (not shown) are provided.
Incombustibles are separated from the sand particles transported by a. The sand particles from which incombustible substances have been removed by the incombustible substance discharge device 18 are returned to the fluidized bed FD by a conveyor (not shown). A configuration for maintaining the fluidized bed temperature in the waste pyrolysis furnace 11 will be described below.

In order to maintain the temperature of the fluidized bed, secondary air is supplied as a combustion gas. The secondary air is provided on the furnace wall of the fluidized bed section and introduces the secondary air toward the upper surface of the fluidized bed. A plurality of nozzles 116, a secondary air passage 117 connected to each of these nozzles 116, and a secondary air passage 11
And a damper 119 provided in the secondary air passage 117 on the upstream side of the blower 118.
A flow rate detector 120 for detecting a flow rate in the secondary air passage 117; and a flow rate controller 12 for adjusting the opening degree of the damper 119 based on the flow rate output from the flow rate detector 120.
1 is provided. The secondary air passage 117 and the blower 1
18 can be regarded as a gas supply means, and the damper 11
9. The flow detector 120 and the flow controller 121 can be regarded as flow control means.

The flow controller 121 includes a thermocouple 122
The fluidized bed temperature signal measured by the thermocouple 122, specifically, the voltage generated by the thermocouple 122 is provided. The thermocouple 122 is fixed to the furnace wall while penetrating the furnace wall in the fluidized bed portion.

Further, the nozzles 116 are arranged substantially uniformly on the entire circumference of the furnace wall, and are connected to the secondary air passage 117 via an annular header 116a arranged so as to surround the decomposition furnace. . The nozzle 116 is mounted at a position higher than the upper surface of the fluidized bed FD,
The secondary air supplied through the nozzle 116 is supplied to the fluidized bed FD
It is designed to be sprayed on the upper surface. The purpose of this arrangement is to prevent the secondary air introduced from the nozzle 116 from affecting the flow state of the fluidized bed. Further, since the nozzle 116 is disposed near the upper surface of the fluidized bed FD and secondary air is not blown into the fluidized bed FD, the nozzle 116 is so configured that the resistance of the fluidized bed is exceeded.
It is not necessary to pressurize the secondary air to be supplied to the air, and the air can be supplied at atmospheric pressure using the blower 118 as described above. Therefore, there is an advantage that the means for supplying the secondary air can be realized with a simple configuration.

Next, the temperature control operation in the waste pyrolysis furnace 11 will be described. When waste having a low calorific value is input from the waste input port 114, or when the temperature of the fluidized bed FD starts to decrease due to a decrease in the supply amount or the like, the temperature is output from the thermocouple 122 that detects the fluidized bed temperature. Voltage drops. The flow controller 121 detects this decrease in voltage, opens the damper 119, and drives the blower 118. Thereby, the secondary air is blown toward the upper surface of the fluidized bed FD through the nozzle 116, and the blown secondary air burns a part of a combustible component such as a pyrolysis gas generated from the fluidized bed FD. Accordingly, the temperature of the fluidized bed rises due to the heat of combustion, thereby suppressing the temperature drop of the fluidized bed.

FIGS. 3 and 4 are graphs showing the temperature control operation. FIG. 3A shows the transition of the temperature of a fluidized bed in the related art as a comparative example. Once the temperature of the fluidized bed starts to fall, the temperature falls below the lower limit of the temperature suitable for thermal decomposition. On the other hand, in the present invention, FIG.
As shown in (2), when the temperature of the fluidized bed approaches the lower limit of the appropriate temperature, secondary air is blown into the upper surface of the fluidized bed, so that the temperature of the fluidized bed deviates from the lower limit of the appropriate temperature for thermal decomposition. To do so. At this time, the supply amount of the secondary air is changed according to the fluidized bed temperature or the change amount thereof. FIG. 4 shows the fluctuation of the fluidized bed temperature under the control of the present invention. As shown in the figure,
Although the fluidized bed temperature slightly increased on average, it was confirmed that the fluidized bed temperature did not fluctuate greatly and was stabilized.

Next, the melting and burning furnace 12 connected to the latter stage of the waste pyrolysis furnace 11 will be described. In FIG. 1, a melting combustion furnace 12 uses combustion air to be supplied and an auxiliary fuel depending on conditions.
Is further burned, and the heat generated by this combustion is used to melt the ash in the gas and discharge it as slag. The inner wall of the melting and burning furnace 12 is made of a refractory material. In the furnace, a combustion and melting chamber 12a and a slag separation section 12b are formed along the flow of gas, and a slag discharge section is formed below the slag separation section 12b. It has an outlet 12c and its slag discharge port 1
An exhaust gas outlet 12d is provided branching from the position 2c.

A pipe 12e extending from an outlet 11c of the waste pyrolysis furnace 11 is connected to an upper portion of the melting combustion chamber 12a.
Nozzle 12f for introducing combustion air into b
Is provided. Nozzles 12f arranged in the molten combustion chamber 12a form a swirling flow in the molten combustion chamber 12a by injecting combustion air into the molten combustion furnace 12 from a direction close to a tangential direction of a furnace wall having a circular cross section. You can do it. Note that a start burner 12g is provided at the top of the melting combustion chamber 12a.

Next, the heat exchanger 13 is provided for heating the fluidizing gas supplied to the waste pyrolysis furnace 11 by utilizing the heat of the high-temperature combustion gas sent from the melting furnace 12. ing.

The boiler 14 has a heat exchanger 13
Is used to evaporate water by using the heat of the exhaust gas provided from the steam generator. The energy of the steam generated by the boiler 14 is converted into electric energy by the generator 29 and recovered as surplus electric power or equipment required electric power. Is done.

Next, the processing operation of the waste disposal equipment having the above configuration will be described. First, in the pyrolysis furnace 11, the main burner 115 is ignited, the surface of the sand layer is heated, the fluidizing gas is supplied from the fluidizing gas inlet 11 a into the wind box 113, and the gas flows upward through the gas injection port 111 of the dispersion plate 112. When the fluidizing gas is injected into the
The sand particles filled above the fluid bed are blown up and fluidized bed F
D is formed. When the main burner 115 is turned off in a state where the fluidized bed is formed, and then the waste (object to be treated) such as municipal waste is introduced from the waste inlet 114, the sand falling on the fluidized bed FD and flowing sand The particles are caught in the particles and pyrolyzed by primary combustion.

By setting the amount of air introduced into the waste pyrolysis furnace 11 in this state to 30 to 40% or less of the theoretical air amount and setting the temperature of the fluidized bed FD to 450 to 650 ° C.
The generated pyrolysis gas contains a large amount of combustibles. When the amount of heat generated by the waste input to the waste pyrolysis furnace 11 is low and the temperature of the fluidized bed FD decreases, the flow controller 121 increases the opening of the damper 119 to increase the blower 11.
8 drives the secondary air flowing through the secondary air passage 117 to increase the flow rate, and partially burns the upper layer of the fluidized bed FD. When the temperature of the fluidized bed FD rises due to the partial combustion, the flow controller 121 reduces the opening degree of the damper 119 and reduces the supply amount of the secondary air.

By controlling the temperature of the fluidized bed in this way, the pyrolysis gas generated in the pyrolysis furnace 11 rises from the fluidized bed FD in a state in which the composition is stable, and the pyrolysis gas at the upper end of the free board portion 11b is formed. It is sent out from the outlet 11g. The sent pyrolysis gas is then sent to the melting combustion furnace 12 where it is further burned at a high temperature, the ash in the pyrolysis gas is melted, discharged from the slag discharge port 12c as slag, and sent to the slag discharge device 20. The high-temperature gas after combustion is introduced into the high-temperature gas inlet of the heat exchanger 13 through the heat-resistant pipe 12i.

On the other hand, some of the sand particles constituting the fluidized bed FD in the waste pyrolysis furnace 11 are guided to the incombustible discharge passage 11d together with the incombustible mixed therein and sent to the incombustible discharge device 18. Can be In this incombustible discharge device 18,
The mixture is sieved, coarse incombustibles and fine sand particles S
And separated. The coarse incombustibles contain valuable metals such as unmelted aluminum and iron, and these valuable metals are extracted as resources for recycling.

The sand particles from which incombustible substances have been removed in this way are returned to the fluidized bed FD of the pyrolysis furnace 11. On the other hand, the gas cooled by the heat exchanger 13 is sent out from the low-temperature side gas outlet, and is discharged from the chimney 23 through the boiler 14 and the bag filter 16 to the outside of the waste treatment facility. That is, after sufficiently lowering the temperature of the exhaust gas sent from the melting and burning furnace 12, the boiler 14 and the bag filter 16
Through the boiler 14 and the bag filter 16
Can be prevented from being thermally damaged.

[0042]

As is apparent from the above description,
According to the temperature control method of the fluidized bed pyrolysis furnace of the present invention, when the fluidized bed with a small calorific value is supplied, or when the supply amount of waste fluctuates and the fluidized bed temperature decreases,
The pyrolysis furnace can be operated stably by increasing the temperature of the fluidized bed.

According to the waste pyrolysis furnace of the present invention, waste having a low calorific value is introduced into the fluidized bed, or the supply amount of waste fluctuates and the temperature of the waste pyrolysis furnace is lowered. In such a case, the waste pyrolysis furnace can be maintained at an appropriate pyrolysis temperature.

According to the waste treatment equipment of the present invention, since the waste pyrolysis furnace can be operated stably, the composition of the pyrolysis gas generated in the pyrolysis can be stabilized.
Combustion in the melting and burning furnace provided at the subsequent stage of the fluidized bed pyrolysis furnace is stabilized, and the melting and burning furnace can be operated stably.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing the overall configuration of a waste treatment facility to which the present invention is applied.

FIG. 2 is a longitudinal sectional view showing one embodiment of a waste pyrolysis furnace according to the present invention.

FIG. 3 is a graph illustrating fluidized bed temperature control by a waste pyrolysis furnace according to the present invention.

FIG. 4 is a graph showing a change in fluidized bed temperature by the waste pyrolysis furnace of the present invention.

[Explanation of symbols]

 11 Waste Pyrolysis Furnace 11a Fluidizing Gas Injection Port 11b Free Board Unit 12 Melting Combustion Furnace 13 Heat Exchanger 14 Waste Heat Boiler 18 Impurity Discharge Device 116 Nozzle 117 Secondary Air Passage 118 Blower 119 Damper 121 Flow Controller FD Fluidized Bed

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Mamoru Suyari 1-5-5 Takatsukadai, Nishi-ku, Kobe City Inside Kobe Steel Research Laboratory, Kobe Steel Ltd. (72) Inventor Tadayuki Minoura 1-chome, Takatsukadai, Nishi-ku, Kobe No.5-5 Inside Kobe Research Institute, Kobe Steel, Ltd.

Claims (5)

[Claims] 1. A fluidized medium is charged into a furnace having a gas dispersion plate at the bottom, and a gas is sent from below the gas dispersion plate to fluidize the fluidized medium, thereby covering the fluidized bed in a fluidized state. In the pyrolysis method of supplying a combustion product and pyrolyzing gas, supplying a combustion gas toward the upper surface of the fluidized bed and burning a part of a combustible component such as a pyrolyzed gas generated from the fluidized bed, A method for controlling the temperature of a fluidized bed pyrolysis furnace, wherein the combustion heat is applied to the fluidized bed to prevent the temperature of the fluidized bed from lowering. 2. A fluidized medium is charged into a furnace having a gas dispersion plate at the bottom, and gas is sent from below the gas dispersion plate to fluidize the fluidized medium and is discarded in a fluidized bed in a fluidized state. In a single-column waste pyrolysis furnace that supplies materials and pyrolyzes and gasifies, a part of combustible components such as pyrolysis gas generated from the fluidized bed is burned, and the combustion heat is given to the fluidized bed. A waste pyrolysis furnace comprising a fluidized bed temperature control means for preventing the temperature of the fluidized bed from lowering. 3. The fluidized bed temperature control means is provided to a nozzle provided through a furnace wall surrounding the fluidized bed, gas supply means for supplying a combustion gas to the nozzle, and supplied to the nozzle. The waste pyrolysis furnace according to claim 2, comprising flow rate adjusting means for adjusting a gas flow rate. 4. The waste pyrolysis furnace according to claim 3, wherein the nozzle is arranged so that the combustion gas is blown toward the upper surface of the fluidized bed. 5. The waste pyrolysis furnace according to claim 2, wherein the pyrolysis gas is supplied from the waste pyrolysis furnace and a high-temperature combustion is carried out. A waste treatment facility comprising a melting and burning furnace for melting ash therein.