JP3678839B2 - Fluidized bed heat recovery device and operation method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fluidized bed heat recovery apparatus that incinerates industrial waste, municipal waste, coal, and the like by forming a fluidized bed composed of sand particles and recovers the heat generated thereby, and an operating method thereof.
[0002]
[Prior art]
Conventionally, a fluidized bed heat recovery device in which a fluidized bed made of sand particles is formed on the bottom of a furnace is often used as a device for recovering heat from incineration of industrial waste or the like. This device has the advantages that the mixing of the particles in the fluidized bed is extremely good, the temperature in the bed can be kept uniform, and the restarting is easy due to the large heat retention capacity of the particle bed. ing.
[0003]
As this type of apparatus, for example, Japanese Patent Laid-Open No. 63-187001 discloses an apparatus as shown in FIG.
[0004]
In the figure, a mountain-shaped air dispersion plate 92 is provided at the bottom of a furnace 90, and the air discharged from the blower 91, that is, fluidized gas, is ejected upward from the air dispersion plate 92, thereby comprising sand particles. A fluidized bed is formed. Specifically, the gas injection speeds at the left and right wing portions of the dispersion plate 92 are set to be higher than those at the center portion, and a reflection partition 93 having a shape facing the fluidizing gas injection direction is provided above the air dispersion plate 92. Therefore, the sand particles form a fluidized bed that is blown up vigorously by the left and right wings and then reflected by the reflection partition 93 and settles at the center.
[0005]
When an object to be treated such as municipal waste is introduced into the main main combustion chamber 96 from the upper inlet 89 to such a fluidized bed, the object to be treated flows with sand particles in the fluidized bed. The incombustible material is combusted, and the incombustible material is carried out of the apparatus by the screw conveyor 99 through the incombustible material discharge port 98. Further, part of the sand particles passes through the reflection partition 93 and enters the heat recovery chamber 94 outside the partition, and settles in the heat recovery chamber 94. A heat transfer tube 95 is disposed in the heat recovery chamber 94, and the heat of the sand particles that has entered the heat recovery chamber 94 is recovered by the heat transfer tube 95.
[0006]
[Problems to be solved by the invention]
In the above apparatus, heat generated by the combustion of the workpiece is transferred to the heat transfer tube 95 through sand particles flowing in the furnace. In other words, only the heat generated in the fluidized bed out of the heat generated by incineration of the workpiece can be recovered by the heat transfer tube 95, and other heat, for example, generated by combustion in the freeboard above the fluidized bed. In order to recover the generated heat, a much larger heat transfer area is required as compared with the heat recovery by the heat transfer tube in the fluidized bed.
[0007]
Here, in the conventional heat recovery apparatus, the amount of heat generated in the fluidized bed out of the total heat amount, that is, the ratio of the recoverable heat amount (hereinafter referred to as the combustion rate) is said to be a little more than 50%. Heat recovery loss is large, and its improvement is a major issue. In particular, when a waste or the like that is easily gasified and combusted, such as plastics, is administered as the object to be treated, the combustion rate is remarkably lowered, and the inconvenience becomes more serious.
[0008]
As a means for improving the heat recovery efficiency, the applicant of the present invention has applied for a method for promoting combustion of an object to be processed in a fluidized bed using a fluidized gas for fluidizing the fluidized bed as an oxygen-enriched gas. Although proposed in Japanese Patent No. 7-185972, it is necessary to use a large amount of oxygen gas in this method, which disadvantageously increases the cost.
[0009]
In addition, there is a method of increasing the flow rate of the fluidized gas itself. However, since the fluidized gas is injected against the resistance of the fluidized bed, the operating power is greatly increased to increase the flow rate. It is also disadvantageous in terms of cost.
[0010]
An object of this invention is to provide the fluidized-bed heat recovery apparatus which can improve the heat recovery efficiency from a fluidized bed effectively with a simple and cheap structure, and its operating method in view of the said situation.
[0011]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems, the present invention provides a processing object in which a fluidized bed made of fluidized particles is formed at the bottom of the apparatus main body, and the object to be processed is introduced into the fluidized bed above the fluidized bed. In the fluidized bed heat recovery apparatus provided with a charging section and provided with heat recovery means for recovering heat generated by incineration of the object to be processed in the fluidized bed in the fluidized bed, the fluidized bed is in a stationary state. An intermediate ceiling is provided at a height position just above the upper surface of the fluidized bed at which the fluidized particles of the fluidized bed can be returned , and blocks a part of the space at the height position. On the side wall on the opposite side of the intermediate ceiling, obliquely downward so that the combustion auxiliary air spreads below the intermediate ceiling from the position higher than the upper surface of the fluidized bed when the fluidized bed is stationary. Supply combustion auxiliary air In which the supply means.
[0012]
According to this apparatus, by the combustion auxiliary air supply means, by the combustion auxiliary air is supplied to the fluidized layer from the fluidized bed upper surface above a height position when the fluidized bed is at rest, the combustion Combustion of the material to be processed in the fluidized bed portion supplied with the auxiliary air is remarkably accelerated, and the amount of heat recovered from the fluidized bed is increased correspondingly.
[0013]
Moreover, the combustion auxiliary air supply means, since those which the fluidized bed is supplied from a position higher than the fluidized bed upper surface when in a quiescent state the combustion auxiliary air obliquely downward, the fluidized bed by the combustion auxiliary air Ascending exhaust gas can be pressed downward, and the amount of heat recovered through the fluidized bed can be increased accordingly.
[0014]
In addition, an intermediate ceiling is provided at a height position just above the upper surface of the fluidized bed when the fluidized bed is in a stationary state, so that a part of the space at this height position is blocked. In addition, the amount of heat recovered from the fluidized bed is further increased by pushing back the rising fluid particles.
[0015]
Then, the side wall of the intermediate ceiling opposite provided with the combustion auxiliary air supply means, by supplying the combustion auxiliary air obliquely downward with respect to the fluidized bed, easily spread the supply air to an intermediate ceiling of the lower Can be made.
[0016]
It is preferable that the depression angle of the combustion auxiliary air supplied by the combustion auxiliary air supply means is 15 ° or more. However, if the supply depression angle is too large, the area where the combustion auxiliary air hits the upper part of the fluidized bed becomes small. Therefore, in order to reach the combustion auxiliary air over a wide range, the supply depression angle is preferably 45 ° or less.
[0017]
Further, by providing the workpiece input section on the intermediate ceiling, it becomes possible to easily input the workpiece to the fluidized bed from above.
[0018]
Further, heat exchange means for heating the combustion auxiliary air by heat exchange of the combustion auxiliary air with the apparatus exhaust gas at a stage before the supply of the combustion auxiliary air is provided, or a heat recovery fluid is caused to flow inside as the heat recovery means. When the heat transfer tube is arranged in the fluidized bed, heat exchange is performed between the heat recovery fluid discharged from the heat transfer tube and performing work and the combustion auxiliary air before the combustion auxiliary air is supplied. By providing heat exchange means for heating the combustion auxiliary air, the exhaust heat of the device can be effectively used to heat the combustion auxiliary air and then supply it to the fluidized bed. Can be improved efficiently.
[0019]
As described above, since the amount of heat generated in the fluidized bed and thus the fluidized bed temperature can be significantly affected by the supply of the combustion auxiliary air, by adjusting the amount of combustion auxiliary air supplied,
It is possible to control the fluidized bed temperature to a favorable temperature. Specifically, the fluidized bed temperature is maintained at an appropriate temperature by detecting the temperature of the fluidized bed and adjusting the supply flow rate of the combustion auxiliary air so that the temperature approaches the target temperature. It becomes possible.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS.
[0021]
The fluidized bed heat recovery apparatus shown in FIG. 3 includes an incinerator 10 surrounded by a heat insulating wall 11. A fluidized bed 12 made of sand or the like is formed at the bottom of the incinerator 10, and a free board 14 is above the fluidized bed 12. At the middle position of the incinerator 10, the heat insulating wall 11 partially protrudes inward to form an intermediate ceiling 15. The height of the intermediate ceiling 15 corresponds to the height of the fluidized bed 12 when the fluidized bed 12 is stationary. The height is just above the upper surface of the fluidized bed 12 (hereinafter referred to as the stationary fluidized bed surface). The intermediate ceiling 15 is formed with an incinerator inlet 16 through which an object to be processed can be thrown obliquely downward. An incinerator feeder 18 is connected to the incinerator inlet 16. In addition, secondary air is supplied from the secondary air blower 20 at a height position slightly above the intermediate ceiling 15.
[0022]
The heat insulating wall 11 of the free board 14 has a membrane structure in which an inner surface is covered with a refractory at a certain height, and is configured to absorb heat from the gas layer through the wall surface.
[0023]
A duct 24 is connected to the upper portion of the incinerator 10, and a steam reservoir 25 is provided at the inlet of the duct 24. The vapor evaporated by the membrane collects in the vapor reservoir 25, and the vapor collects the heat of the exhaust gas by the super heater 26 in the duct 24 and is sent to a heat transfer tube 46 described later as a heat recovery fluid. The exhaust gas is deprived of heat by the super heater 26, and further deprived of heat by an evaporator 28, a feed water heater 29 for avoiding low temperature corrosion, and an air heater 30 for combustion air. Then, after being cooled by the gas cooler 32, dust is removed by the bag filter 34 and exhausted from the chimney through the exhaust fan 36.
[0024]
Next, the structure of the bottom part of the said incinerator 10 and its vicinity part is demonstrated based on FIG.1 and FIG.2.
[0025]
A first dispersion plate 38 is disposed at the center in the left-right direction of the furnace bottom, and second dispersion plates 40 are disposed on both the left and right sides of the first dispersion plate 38. Both the second dispersion plates 40 are thermally insulated. Adjacent to the wall (side wall of the apparatus main body) 11. The first dispersion plate 38 is inclined in a mountain shape that becomes lower toward the left and right incombustible discharge parts 42, and the second distribution plate 40 is also inclined in a direction that becomes lower as it goes toward the incombustible discharge parts 42.
[0026]
The first dispersion plate 38 and the second dispersion plate 40 are spaced apart from each other in the horizontal direction, and this portion serves as an incombustible discharge part 42. A non-combustible material extraction device 44 is provided below the non-combustible material discharge portion 42. The non-combustible material extraction device 44 is a screw conveyor that conveys the non-combustible material-containing sand derived from the non-combustible material discharge portion 42 to the left and right outer sides. Built-in.
[0027]
Above both the second dispersion plates 40, a plurality of heat transfer tubes (heat recovery means) 46 are arranged in parallel in the depth direction in FIG. 1 (up and down direction in FIG. 2) at equal intervals. Each heat transfer tube 46 penetrates the lower part of the heat insulation wall 11 to the side, faces the furnace, meanders on the second dispersion plate 40, passes through the heat insulation wall 11 above the penetration part, and goes out of the furnace. Both ends are connected to an inlet header (not shown) and an outlet header 48 (FIG. 2) extending in the depth direction of FIG. The steam sent from the super heater 26 to the inlet header flows through the heat transfer pipe 46 as a heat recovery fluid, and is collected by the outlet header 48, and then sent to a turbine (not shown) to perform work. Has been.
[0028]
In the furnace, an air diffusion pipe 50 that divides the fluidized bed 12 into a main combustion part and a heat recovery part is disposed. Each diffuser tube 50 includes an upper portion 51 positioned above the heat transfer tube 46 and a vertical portion extending from the upper portion 51 through the side of the heat transfer tube 46 in a substantially vertical direction and reaching the second dispersion plate 40. 52, and a plurality of gas injection holes are formed in the side surface of the tube wall of the upper portion 51 and in the vicinity thereof.
[0029]
The upper part 51 is inclined in a direction that becomes lower toward the incombustible discharge part 42, and the upper surface of the fluidized bed 12 is located slightly above the upper part 51. A baffle 54 made of a refractory material, a jacket, or the like is disposed around the middle portion of the upright portion 52, and sand particles can be circulated in a small amount through a minute gap 55 provided between the baffles 54. ing.
[0030]
A large number of fluidized gas injection holes are formed in the dispersion plates 38 and 40. A plurality of gas chambers 41b are arranged below the first dispersion plate 38, and a plurality of gas chambers 41a, 40a, 40b, 40c are arranged below the second dispersion plate 40 in the left-right direction. A diffuser is comprised with the dispersion plate.
[0031]
A primary air blower 56 is connected to the gas chambers 41 a, 40 a, 40 b, and 40 c via a pipe 57, and fluidized gas (air) discharged from the primary air blower 56 flows through the dispersion plates 38 and 40. The fluidized gas injection port and the fluidized gas injection port of the diffuser tube 52 are injected into the fluidized bed 12. In the middle of each pipe 57, a damper (not shown) for adjusting the flow rate of the fluidized gas is provided, and the fluidized gas injection amount can be adjusted for each pipe 57 using this damper.
[0032]
Further, as a feature of this apparatus, a combustion auxiliary air nozzle 62 is provided on the side wall (the right side wall in FIGS. 1 and 3) opposite to the side wall forming the intermediate ceiling 15 in the heat insulating wall 11. . On the other hand, a combustion auxiliary air blower 60 is connected to the inlet end (right end in FIG. 3) of the air heater 30, and the outlet end is connected to the combustion auxiliary air nozzle 62 via a pipe. Air discharged from the blower 60 is supplied from the combustion auxiliary air nozzle 62 into the furnace through the air heater 30. That is, the combustion auxiliary air blower 60 and the combustion auxiliary air nozzle 62 constitute combustion auxiliary air supply means in the present invention, and before the air discharged from the combustion auxiliary air blower 60 reaches the combustion auxiliary air nozzle 62. In addition, the air heater 30 is heated by heat exchange with the apparatus exhaust gas.
[0033]
The combustion auxiliary air nozzle 62 is provided at a height slightly above the surface of the stationary fluidized bed, and is configured to supply combustion auxiliary air obliquely downward at a depression angle α (about 20 ° in the example). The depression angle α and the height position of the combustion auxiliary air nozzle 62 are set so that the combustion auxiliary air is supplied from the combustion auxiliary air nozzle 62 toward the upper end portion of the fluidized bed 12.
[0034]
Next, the operation of this apparatus will be described.
[0035]
Wastes (objects to be treated) such as municipal waste that are thrown obliquely downward from the incineration material inlet 16 first fall into the fluidized bed 12 (in the main combustion section) on the first dispersion plate 38 and burn. In the fluidized bed 12, the sand particles rising through the vicinity of the baffle 54 overflow to the center side of the furnace and the left and right end sides (the side toward the upper side of the air diffuser 50), and sink.
[0036]
More specifically, the particles overflowing to the left and right ends pass through the gap between the diffuser tubes 50 and settle between the heat transfer tubes 46 in the heat recovery section sandwiched between the baffle 54 and the heat insulating wall 11. After incineration heat is applied to the heat pipe 46 (that is, after the heat transfer pipe 46 collects the incineration heat), the heat pipe 46 slides down along the inclined surface of the second dispersion plate 40 toward the incombustible discharge section 42. Further, the particles overflowing to the center of the furnace settle down as they are to the center of the mountain of the first dispersion plate 38 and slide down along the inclined surface of the first dispersion plate 38 toward the incombustible material discharge part 42 side. Here, since strong fluidized gas is injected from the gas chamber 40a immediately before the incombustible discharge part 42, some sand particles are pushed up by the fluidized gas and recirculated to the main combustion part. Then, the other sand particles fall into the incombustible discharge section 42 together with the incombustible (solid), and are carried out to the left and right outer sides by the incombustible extractor 44. The output is sieved and only fine sand particles are re-supplied to the fluidized bed 12.
[0037]
Here, since combustion auxiliary air is supplied to the upper end portion of the fluidized bed 12 from the combustion auxiliary air nozzle 62, combustion of the object to be processed can be activated in this portion. Accordingly, the combustion rate in the fluidized bed 12 increases, and the amount of heat recovered from the fluidized bed 12 through the heat transfer tube 46 increases. In particular, the increase in the air ratio in the upper part of the fluidized bed 12 significantly affects the combustion of the object to be processed in the fluidized bed 12, so that the heat recovery amount can be greatly increased. The fluidized bed temperature can be freely controlled by adjusting the combustion auxiliary air amount. Specifically, as shown in FIG. 1, a thermometer 66 for detecting the temperature of the upper part of the fluidized bed 12 is provided, while a damper is provided in the middle of a pipe that communicates with the combustion auxiliary air nozzle 62, and is detected by the thermometer 66. When the measured temperature falls below the target temperature, the combustion auxiliary air supply amount is increased by operating the damper, and conversely, when the detected temperature exceeds the target temperature, the combustion auxiliary air supply amount is reduced to reduce the actual fluidized bed temperature. Can be maintained at a suitable temperature.
[0038]
Moreover, in this embodiment, since the combustion auxiliary air is heated after using the heat of the apparatus exhaust gas to supply the combustion auxiliary air, combustion in the fluidized bed 12 can be promoted efficiently, It is possible to reduce energy consumption.
[0039]
Further, in this embodiment, since the intermediate ceiling 15 is formed at a height position immediately above the stationary fluidized bed surface, the flow is caused by heat radiation from the intermediate ceiling 15 or return of the fluid medium by the intermediate ceiling 15. The proportion of activation of combustion in the bed 12 contributing to the fluidized bed temperature is further increased. Therefore, the heat recovery efficiency can be significantly increased by a small combustion auxiliary air supply amount, and the range of fluidized bed temperature that can be controlled by the combustion auxiliary air supply amount can be widened.
[0040]
Further, by providing the workpiece inlet 16 in the intermediate ceiling 15, there is also an advantage that the workpiece can be easily charged into the fluidized bed 12 from above.
[0041]
In addition, since the combustion auxiliary air nozzle 62 is disposed above the fluidized bed 12 and is supplied obliquely below, the rising exhaust gas from the fluidized bed 12 is suppressed by this supplied air, There is an advantage that the amount of heat recovery can be further increased. Specifically, the supply depression angle α is preferably set to 15 ° or more. However, if the supply depression angle α is too large, the area where the combustion auxiliary air is supplied to the fluidized bed 12 becomes narrow. Therefore, in order to supply the combustion auxiliary air over almost the entire upper part of the fluidized bed 12, The supply depression angle α is preferably set to 45 ° or less.
[0042]
When the supply depression angle α is set in the range of 15 ° to 45 ° as described above in the apparatus shown in FIG. 1, the position of the combustion auxiliary air nozzle 62 is set within the range of the height region H in FIG. It will be.
[0043]
In addition, since the combustion auxiliary air nozzle 62 is provided on the side wall opposite to the intermediate ceiling 15 (that is, the side wall facing the intermediate ceiling 15), the advantage that the supplied air can be easily distributed below the intermediate ceiling 15 can be obtained.
[0044]
A second embodiment is shown in FIG.
[0045]
Here, a steam type air heater (heat exchange means) 64 is provided between the combustion auxiliary air blower 60 and the combustion auxiliary air nozzle 62. Then, steam (heat recovery fluid) that has exited the heat transfer tube 46 and worked in the turbine is introduced into the steam air heater 64, where the steam and combustion auxiliary air exchange heat, thereby combusting. The auxiliary air is heated.
[0046]
Also in this apparatus, the combustion auxiliary air can be efficiently heated by effectively using the exhaust heat, the heat recovery efficiency from the fluidized bed 12 can be increased with less energy consumption, and the supply amount of the combustion auxiliary air is adjusted. The range of the fluidized bed temperature that can be controlled by this can be expanded.
[0047]
In addition, this invention is not limited to the above embodiment, It can also take the following aspects as an example.
[0048]
(1) As described above, in the present invention, the fluidized bed temperature can be satisfactorily controlled by adjusting the supply amount of combustion auxiliary air. When the temperature variation is large, the fluidized bed gas supply amount may be increased or decreased in parallel with this.
[0049]
(2) The flow rate of the combustion auxiliary air may be set as appropriate. When considering the penetration of combustion auxiliary air, the flow rate may be determined using the following formula as a guide.
[0050]
[Expression 1]
Vj = a * djb / Vm
Here, dj is the diameter of the supply port, Vj is the flow velocity at the supply port, Vm is the main flow velocity, and a and b are experimental constants.
[0051]
(3) The ratio of the combustion auxiliary air supply amount to the total air supply amount including the primary air supply amount and the secondary air supply amount may be set as appropriate. However, considering the operational balance of the entire incinerator, the above ratio should be set to 25% or less as a guide.
[0052]
【Example】
In the apparatus shown in FIG. 1, when the combustion auxiliary air amount is changed stepwise as shown in FIG. 5 (a), the fluidized bed temperature (sand layer temperature) fluctuated as shown in FIG. 5 (b). . Comparing these graphs, it can be understood that the fluidized bed temperature is sensitive to the amount of combustion auxiliary air.
[0053]
【The invention's effect】
As described above, according to the present invention, in the fluidized bed heat recovery apparatus, with respect to the fluidized bed formed at the bottom of the apparatus main body, the fluidized bed is inclined downward from a height position above the fluidized bed upper surface when the fluidized bed is in a stationary state. Is provided with combustion auxiliary air supply means for supplying combustion auxiliary air to the chamber, so that the combustion of the object to be processed in the fluidized bed is significantly accelerated to effectively increase the amount of heat recovered from the fluidized bed. Can be made.
[0054]
In particular, since the combustion auxiliary air is supplied obliquely downward from a position higher than the upper surface of the fluidized bed when the fluidized bed is in a stationary state, the exhaust gas rising from the fluidized bed is lowered downward by the combustion auxiliary air. By pressing down, there is an effect that the amount of heat recovered from the fluidized bed can be further increased.
[0055]
In addition, an intermediate ceiling is provided at a height position just above the upper surface of the fluidized bed when the fluidized bed is in a stationary state, so that the amount of heat recovered from the fluidized bed. Can be further increased.
[0056]
Moreover, the combustion auxiliary air supply means to the side wall of the intermediate ceiling opposite provided, by supplying a combustion auxiliary air obliquely downward with respect to the fluidized bed, easily spread the supply air to an intermediate ceiling of the lower Can be made.
[0057]
Further, in the present invention, by setting the combustion auxiliary air supply depression angle by the combustion auxiliary air supply means to be not less than 15 ° and not more than 45 °, the combustion auxiliary air is supplied to the fluidized bed while sufficiently securing the above-mentioned pressing effect. An effect capable of reaching a wide range is obtained.
[0058]
Further, by providing the workpiece input portion on the intermediate ceiling, an effect that the workpiece can be easily input from above into the fluidized bed is obtained.
[0059]
Furthermore, heat exchange means for heating the combustion auxiliary air by heat exchange of the combustion auxiliary air with the apparatus exhaust gas at a stage before the supply is provided, or a heat recovery fluid is caused to flow inside as the heat recovery means. When the heat transfer tube is arranged in the fluidized bed, heat exchange is performed between the heat recovery fluid discharged from the heat transfer tube and performing work and the combustion auxiliary air before the combustion auxiliary air is supplied. By providing heat exchange means for heating the combustion auxiliary air, the exhaust heat of the device can be effectively used to heat the combustion auxiliary air and then supply it to the fluidized bed. The effect that can be improved efficiently is obtained.
[0060]
Then, in each of the above devices, the fluidized bed temperature is adjusted to an appropriate temperature by detecting the temperature of the fluidized bed and adjusting the supply flow rate of the combustion auxiliary air so that the temperature approaches the target temperature. Can be maintained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional front view showing a main part of a fluidized bed heat recovery apparatus according to a first embodiment of the present invention.
FIG. 2 is a partial cross-sectional plan view showing the main part.
FIG. 3 is an overall configuration diagram of the fluidized bed heat recovery apparatus.
FIG. 4 is an overall configuration diagram of a fluidized bed heat recovery apparatus according to a second embodiment of the present invention.
5A is a graph showing a time change of the combustion auxiliary air amount adjusted in the apparatus shown in FIG. 1, and FIG. 5B is a graph showing a time change of the sand layer temperature corresponding thereto.
FIG. 6 is a sectional front view showing an example of a conventional fluidized bed heat recovery apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Incinerator 11 Insulation wall 12 Fluidized bed 15 Intermediate ceiling 16 Processed object inlet 30 Air heater (heat exchange means)
46 Heat transfer tube (heat recovery means)
60 Combustion auxiliary air blower (combustion auxiliary air supply means)
62 Combustion auxiliary air nozzle (combustion auxiliary air supply means)
64 Steam air heater (heat exchange means)
66 Thermometer α Combustion auxiliary air supply depression angle

Claims (6)

A fluidized bed composed of fluidized particles is formed at the bottom of the apparatus main body, and a workpiece input part for introducing a workpiece into the fluidized bed is provided above the fluidized bed, and the fluidized bed is provided with the fluidized bed. in the fluidized bed heat recovery unit heat recovery means is provided for recovering the heat generated by incineration of the object in the layer, just height above the fluidized bed upper surface when the fluidized bed is at rest An intermediate ceiling that blocks a part of the space at the height position is provided at a position where the fluidized particles of the fluidized bed can be returned , and the fluidized bed is stationary on the side wall opposite to the intermediate ceiling. Combustion auxiliary air supply means for supplying combustion auxiliary air to the fluidized bed obliquely downward from the position higher than the upper surface of the fluidized bed when in a state is provided to the lower side of the intermediate ceiling. Characteristic flow Heat recovery equipment.   2. The fluidized bed heat recovery apparatus according to claim 1, wherein a combustion auxiliary air supply depression angle by the combustion auxiliary air supply means is 15 ° or more and 45 ° or less.   The fluidized bed heat recovery apparatus according to claim 1 or 2, wherein the workpiece input portion is provided on the intermediate ceiling.   The fluidized bed heat recovery apparatus according to any one of claims 1 to 3, further comprising heat exchange means for heating the combustion auxiliary air by exchanging heat with the apparatus exhaust gas at a stage before the combustion auxiliary air is supplied. A fluidized bed heat recovery apparatus.   The fluidized bed heat recovery apparatus according to any one of claims 1 to 4, wherein, as the heat recovery means, a heat transfer tube in which a heat recovery fluid is flowed is disposed in the fluidized bed and discharged from the heat transfer tube. And a heat exchange means for heating the combustion auxiliary air by exchanging heat between the heat recovery fluid that has been worked and the combustion auxiliary air in a stage before the supply of the combustion auxiliary air. Layer heat recovery device.   A method for operating the fluidized bed heat recovery apparatus according to any one of claims 1 to 5, wherein the temperature of the fluidized bed is detected, and the supply flow rate of the combustion auxiliary air is adjusted so as to approach the target temperature. A method of operating a fluidized bed heat recovery apparatus, characterized by adjusting.

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