JP6916974B1 - Fluidized bed processing furnace - Google Patents

Abstract

The fluidized bed type processing furnace (10) includes a primary combustion chamber (11), a secondary combustion chamber (13), and an internal pressure stabilization chamber (12). The primary combustion chamber (11) has a primary combustion region. The primary combustion region is a region for supplying a flowable gas to a fluidized medium and primary combusting waste in a state where the fluidized medium is fluidized. The secondary combustion chamber (13) has a secondary combustion region. The secondary combustion region is a region for performing secondary combustion in which the primary combustion gas including the unburned gas generated in the primary combustion is burned. The furnace pressure stabilization chamber (12) is a space connected to the primary combustion chamber (11), and primary combustion and secondary combustion do not occur, and the primary combustion chamber (11) and the secondary combustion chamber (13) are not generated. It has a large volume compared to the volume required to connect, and stabilizes the pressure of the gas in the furnace.

Description

The present invention mainly relates to a fluidized bed type treatment furnace that treats waste using a fluidized medium.

In the fluidized bed type processing furnace, the fluidized bed flows by supplying the fluidized gas to the fluidized bed such as silica sand. Waste is supplied into the furnace from above the fluidized bed. The waste naturally falls to the fluidized bed and is taken into the fluidized bed. As a result, the fluidized medium in the fluidized state comes into contact with the waste, and the flowing gas rising in the fluidized bed comes into contact with the waste. As a result, the waste is heated in a short time, and heat treatment such as drying, thermal decomposition, and combustion proceeds.

The properties of the waste supplied to the fluidized bed treatment furnace are not constant, and change depending on, for example, the waste collection place or the season. Further, the supply amount of waste supplied to the fluidized bed type processing furnace is not constant, and for example, a lump of waste may fall together and the supply amount may temporarily increase.

When the properties and supply amount of waste supplied to the fluidized bed processing furnace change, the amount of mixed gas released from the fluidized bed may increase significantly due to the following events. The mixed gas includes, for example, a fluidized gas, a pyrolyzed gas generated by thermal decomposition of waste, and a primary combustion gas (including unburned gas) generated by primary combustion in a fluidized bed. Due to changes in the properties of waste and the amount of supply, the amount of mixed gas (particularly pyrolysis gas or primary combustion gas) may increase locally at some points in the fluidized bed. As a result, the amount of the mixed gas generated at the relevant location increases, so that the flow state at the relevant location becomes more intense than at other locations. As a result, the amount of the mixed gas (particularly the pyrolysis gas or the primary combustion gas) generated at the location is further increased, which exceeds the average value of the amount generated in the entire fluidized bed.

As described above, once the amount of the mixed gas generated increases, the amount of the mixed gas generated continues to increase as long as the event causing the increase of the mixed gas exists. As a result, the pressure inside the furnace becomes significantly large, proper secondary combustion is not performed in the secondary combustion chamber in the subsequent stage, and a large amount of unburned gas is supplied to the downstream side of the secondary combustion chamber.

Since the reaction in which the amount of the mixed gas continues to increase proceeds immediately, the mixed gas rapidly increases in a very short time. Therefore, the control for adjusting the adjusting damper and the blower for attracting the mixed gas, which are arranged in the flow path of the mixed gas, cannot cope with the rapid increase of the mixed gas.

Here, Patent Document 1 discloses a configuration in which a bypass line and a damper are provided in a fluidized air line for supplying fluidized air to a fluidized bed type incinerator. The fluidized air that has passed through the bypass line is blown into the upper part of the incinerator. The proportion of fluidized air passing through the bypass line can be adjusted by the damper. With this configuration, control can be performed so that the amount of fluidized air supplied to the fluidized bed does not become too large. As a result, the fluidization becomes slow, so that the increase in the pressure inside the furnace can be suppressed. Further, Patent Document 1 also discloses a process of limiting the proportion of fluidized air passing through a bypass line in order to prevent flow defects due to a decrease in the amount of fluidized air.

Japanese Unexamined Patent Publication No. 11-325437

In the method of Patent Document 1, since the ratio of the flowing air passing through the bypass line is limited, it is not possible to increase the amount of the flowing air passing through the bypass line so much. Therefore, in the method of Patent Document 1, the effect of reducing the amount of fluidized air and slowing down the fluidized state is very limited. Further, as described above, since the mixed gas rapidly increases in a very short time, there is a possibility that the damper of the bypass line cannot be controlled in time to cope with the rapid increase of the mixed gas.

The present invention has been made in view of the above circumstances, and its main purpose is to be able to stabilize the pressure inside the furnace even when the mixed gas released from the fluidized bed increases rapidly. The purpose is to provide a fluidized bed processing furnace.

The problem to be solved by the present invention is as described above, and next, the means for solving this problem and its effect will be described.

From the viewpoint of the present invention, a fluidized bed type processing furnace having the following configuration is provided. That is, the fluidized bed type processing furnace includes a primary combustion chamber, a secondary combustion chamber, and a furnace pressure stabilizing chamber. The primary combustion chamber has a primary combustion region. The primary combustion region is a region for supplying a flowable gas to a fluidized medium and primary combusting waste in a state where the fluidized medium is fluidized. The secondary combustion chamber has a secondary combustion region. The secondary combustion region is a region for performing secondary combustion for burning the primary combustion gas including the unburned gas generated in the primary combustion. The furnace pressure stabilization chamber is a space connected to the primary combustion chamber. In the in-core stabilization chamber, the primary combustion and the secondary combustion do not occur. The in-combustion stabilization chamber has a large volume as compared with the volume required for connecting the primary combustion chamber and the secondary combustion chamber, and stabilizes the pressure of the gas in the furnace. Let C (%) be the estimated value of the fluctuation of the water content in the waste at the time of being charged into the primary combustion chamber, and the mass per waste at the time of being charged into the primary combustion chamber. The estimated maximum value is D (kg), the normal flow rate of the gas released from the primary combustion region in the steady state is E (m ³ N / h), and the volume of the primary combustion region is F (m ³ ). ^{When β (m 3} ) indicating the volume of the in-combustion pressure stabilization chamber is
α = (D x C / 200 x 1/18 x 22.4) / (E x 1/60 x 1/6)
β> α × F
Meet.

As a result, even when the mixed gas discharged from the fluidized bed suddenly increases, the mixed gas immediately diffuses into the furnace pressure stabilizing chamber, so that the increase in the furnace pressure can be suppressed. Therefore, the pressure inside the furnace can be stabilized.

According to the present invention, the pressure inside the furnace can be stabilized even when the mixed gas discharged from the fluidized bed of the fluidized bed type processing furnace suddenly increases.

The schematic block diagram of the incinerator including the fluidized bed type processing furnace of 1st Embodiment of this invention. The schematic block diagram of the incinerator including the fluidized bed type processing furnace of the 2nd Embodiment of this invention. The figure explaining the calculation formula for calculating the desirable volume of a furnace pressure stabilization chamber.

<Rough Configuration of Processing Equipment> First, the configuration of the incinerator 100 including the fluidized bed type processing furnace 10 of the present embodiment will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of an incinerator 100 including a fluidized bed type processing furnace 10 according to the first embodiment of the present invention. In the following description, the terms "upstream" and "downstream" mean upstream and downstream in the direction in which the object to be treated, combustion gas, exhaust gas, flowing gas, etc. flow.

The incinerator 100 performs heat treatment such as drying, thermal decomposition, and combustion on the solid waste, and also treats the exhaust gas generated by the heat treatment and discharges it to the outside. As shown in FIG. 1, the incinerator 100 includes a fluidized bed processing furnace 10, a gas cooling facility 21, a gas purification facility 22, an attracting blower 23, a first blower 31, and a second blower 32. Be prepared.

Waste is put into the fluidized bed type processing furnace 10 and the above-mentioned heat treatment is performed. Details of the fluidized bed processing furnace 10 will be described later.

The exhaust gas (combustion gas) generated in the fluidized bed type processing furnace 10 is sucked by the attracting blower 23. The exhaust gas generated in the fluidized bed type processing furnace 10 is first supplied to the gas cooling facility 21. The gas cooling facility 21 is provided with an injection device for injecting cooling water. With this configuration, the exhaust gas supplied to the gas cooling facility 21 can be cooled. The cooled exhaust gas is supplied to the gas purification equipment 22.

The gas purification equipment 22 is provided with, for example, a supply device for supplying a chemical substance that reduces the concentration of harmful substances, a filter for collecting ash, and the like. With this configuration, the exhaust gas supplied to the gas purification equipment 22 can be purified. Further, the exhaust gas purified by the gas purification equipment 22 is discharged to the outside through a chimney or the like.

The incinerator 100 of the present embodiment is an example, and may have a different configuration. For example, a heat recovery facility for recovering the heat of the exhaust gas may be provided. The heat recovery equipment may be a boiler that converts the heat of the exhaust gas into steam, or a hot water generator that converts the heat of the exhaust gas into hot water.

<Structure of Fluidized Bed Type Processing Furnace 10> Next, the fluidized bed type processing furnace 10 will be described in detail. As shown in FIG. 1, the fluidized bed type processing furnace 10 includes a primary combustion chamber 11, a furnace pressure stabilizing chamber 12, and a secondary combustion chamber 13.

A fluid medium such as silica sand is deposited in the lower region of the primary combustion chamber 11. Further, fluidized air is supplied to the lower part of the primary combustion chamber 11. The fluidized air is the outside air sucked by the first blower 31 and sent out toward the primary combustion chamber 11. The fluidizing air is supplied upward from below the fluidized medium. As a result, the fluidized medium flows to form a fluidized bed. Further, the fluidized air also has a function as an oxygen source (primary air) for causing primary combustion.

The primary combustion chamber 11 is provided with an inlet (not shown). The inlet is provided at a position higher than the upper surface of the fluidized bed. Waste is supplied above the fluidized bed through the inlet. The waste naturally falls to the fluidized bed and is taken into the fluidized bed. Since the fluid medium is violently flowing, the heating of the waste is promoted by the contact between the fluid medium and the waste, and the heat treatment of the waste proceeds.

In the primary combustion chamber 11, drying, thermal decomposition, and primary combustion occur as heat treatment of the waste. Drying is the evaporation of water contained in waste. Pyrolysis is the generation of pyrolysis gas by thermally decomposing waste and changing its composition. The primary combustion is that a combustion reaction (for example, formation of a flame) occurs due to pyrolysis gas, waste, or the like and oxygen contained in the flowing air. The gas generated by the occurrence of primary combustion is called primary combustion gas. Further, the primary combustion gas includes unburned gas such as hydrocarbon or carbon monoxide. This unburned gas is burned by the secondary combustion described later. Further, a gas (hereinafter referred to as a mixed gas) in which a fluidized gas, a pyrolysis gas, a primary combustion gas and the like are mixed is discharged from the fluidized bed.

Further, in the present embodiment, the region where the waste is dried, thermally decomposed, and the primary combustion is (sufficiently) generated is referred to as a “primary combustion region”. That is, the main treatments that occur in the primary combustion region are waste drying, pyrolysis, and primary combustion. Therefore, the primary combustion chamber 11 includes a primary combustion region. Specifically, a part of the primary combustion chamber 11 (specifically, a region excluding the upper part) corresponds to the primary combustion region.

The mixed gas generated in the primary combustion chamber 11 is supplied to the secondary combustion chamber 13 via the furnace pressure stabilizing chamber 12. The details of the furnace pressure stabilization chamber 12 will be described later. In addition to the mixed gas, secondary combustion air is supplied to the secondary combustion chamber 13. The secondary combustion air is the outside air sucked by the second blower 32 and sent out toward the secondary combustion chamber 13. In the secondary combustion chamber 13, secondary combustion occurs. The secondary combustion means that a combustion reaction (for example, combustion in which a flame is not formed) occurs due to the unburned gas contained in the primary combustion gas and the oxygen contained in the secondary combustion air. The exhaust gas generated in the primary combustion and the secondary combustion is supplied to the gas cooling facility 21 described above.

Further, in the present embodiment, a region where secondary combustion is (sufficiently) generated is referred to as a "secondary combustion region". That is, the main treatment that occurs in the secondary combustion region is secondary combustion. Therefore, the secondary combustion chamber 13 includes a secondary combustion region. Specifically, a part of the secondary combustion chamber 13 (a region on the upstream side of the portion where the secondary combustion is substantially completed) corresponds to the secondary combustion region. Further, in the present embodiment, the secondary combustion air is supplied to the secondary combustion chamber 13, but if it is used for the secondary combustion, it is supplied to another location (for example, the primary combustion chamber 11 or the furnace pressure stabilizing chamber 12). Secondary combustion air may be supplied.

Further, the ash or residue produced by burning the waste is discharged from the lower part of the primary combustion chamber 11. Alternatively, the secondary combustion chamber 13 may melt ash or the like to generate molten slag, and the molten slag may be discharged from the secondary combustion chamber 13.

Here, as described in the background technology column, once the amount of the mixed gas generated in the primary combustion chamber 11 increases, the amount of the mixed gas generated continues to increase for a while. As a result, the pressure inside the furnace becomes significantly large, appropriate secondary combustion does not occur in the secondary combustion chamber in the subsequent stage, and a large amount of unburned gas is supplied to the downstream side of the secondary combustion chamber.

<Function of Internal Pressure Stabilization Chamber 12> The internal pressure stabilization chamber 12 is provided to stabilize the internal pressure of the furnace by suppressing a large increase in the internal pressure of the furnace. Hereinafter, the furnace pressure stabilizing chamber 12 will be described in detail.

The furnace pressure stabilization chamber 12 is connected to the primary combustion chamber 11. Specifically, in the flow direction of the mixed gas, the furnace pressure stabilizing chamber 12 is located on the downstream side of the primary combustion chamber 11 (that is, the primary combustion region, the same applies hereinafter). Furthermore, in the flow direction of the mixed gas, the furnace pressure stabilizing chamber 12 is located on the upstream side of the secondary combustion chamber 13 (that is, the secondary combustion region, the same applies hereinafter). That is, when the region connecting the primary combustion chamber 11 and the secondary combustion chamber 13 is referred to as a connection region, the furnace pressure stabilizing chamber 12 constitutes a part of the connection region. The furnace pressure stabilizing chamber 12 may be formed at a different position as long as it is connected to the primary combustion chamber 11 (see the second embodiment for details).

Further, the furnace pressure stabilizing chamber 12 is connected to a portion where the primary combustion is almost (substantially) completed, and the furnace pressure stabilizing chamber 12 is connected to a portion before the secondary combustion starts. .. Therefore, in the furnace pressure stabilization chamber 12, combustion reactions such as primary combustion and secondary combustion hardly occur. Strictly speaking, there is a possibility that a slight combustion reaction occurs in the furnace pressure stabilization chamber 12, but the degree of combustion progress is almost (substantially) zero compared to the primary combustion chamber 11 or the secondary combustion chamber 13. equal. Therefore, in the following, it is expressed as "a combustion reaction has not occurred in the furnace pressure stabilizing chamber 12".

The furnace pressure stabilization chamber 12 can temporarily store the mixed gas generated in the primary combustion chamber 11. That is, the furnace pressure stabilizing chamber 12 functions as a kind of buffer. Specifically, the mixture gas locally generated in the primary combustion chamber 11 immediately diffuses and spreads. If the furnace pressure stabilizing chamber 12 does not exist, the volume in which the mixed gas can diffuse is small, so that the furnace pressure tends to rise. On the other hand, since the furnace pressure stabilizing chamber 12 has a large volume in which the mixed gas can diffuse, it is possible to suppress an increase in the furnace pressure.

In addition, since the reaction in which the amount of the mixed gas generated continues to increase proceeds immediately, the mixed gas rapidly increases in a very short time. Therefore, for example, the control of changing the output of the attracting blower 23 according to the height of the internal pressure of the furnace cannot cope with the sudden increase of the mixed gas. In this respect, the furnace pressure stabilizing chamber 12 is always connected to the primary combustion chamber 11, and control itself is unnecessary, so that it is possible to cope with a rapid increase in the mixed gas.

In order to sufficiently suppress the increase in the furnace pressure, it is necessary that the volume of the furnace pressure stabilizing chamber 12 is large to some extent. Therefore, the furnace pressure stabilizing chamber 12 has a volume larger than the “volume required for connecting the primary combustion chamber 11 and the secondary combustion chamber 13”. The "volume required to connect the primary combustion chamber 11 and the secondary combustion chamber 13" is the positional relationship between the primary combustion chamber 11 and the secondary combustion chamber 13, their respective sizes, appropriate primary combustion and secondary combustion. Is calculated comprehensively in consideration of the distance between the primary combustion chamber 11 and the secondary combustion chamber 13 for producing the above. For example, in a situation where a new fluidized bed processing furnace having a furnace pressure stabilization chamber 12 is designed based on an existing fluidized bed processing furnace, the volume of the connection area of the base fluidized bed processing furnace is ". It is the volume required to connect the primary combustion chamber and the secondary combustion chamber. " Therefore, for example, when a new fluidized bed processing furnace having a region larger than the connection region of the base fluidized bed processing furnace is manufactured, that region corresponds to the furnace pressure stabilization chamber 12.

Further, for example, when the connection region is tubular, the furnace pressure stabilizing chamber 12 may be configured by making the cross-sectional area of a part of the flow path of the connection region larger than the others. Alternatively, the furnace pressure stabilizing chamber 12 may be configured by making the length of the connection region in the gas flow direction longer than that of the normal connection region.

<Second Embodiment> Next, the second embodiment will be described with reference to FIG. In the description of the second embodiment, the same or similar members as those in the first embodiment may be designated by the same reference numerals in the drawings, and the description may be omitted.

The position of the furnace pressure stabilizing chamber 12 is different between the first embodiment and the second embodiment. Specifically, in the first embodiment, the furnace pressure stabilizing chamber 12 is located on the downstream side of the primary combustion chamber 11. On the other hand, in the second embodiment, the furnace pressure stabilizing chamber 12 is located at a position in parallel, which is neither upstream nor downstream of the primary combustion chamber 11.

In the second embodiment, the furnace pressure stabilizing chamber 12 is connected to a portion above the center of the primary combustion chamber 11. Since the portion above the center of the primary combustion chamber 11 has almost or no primary combustion, that is, in the second embodiment as well as in the first embodiment, the primary combustion in the furnace pressure stabilizing chamber 12 And no secondary combustion occurs. Further, in the first embodiment and the second embodiment, the effect exhibited by providing the furnace pressure stabilizing chamber 12 is the same.

Also in the second embodiment, the furnace pressure stabilizing chamber 12 has a volume larger than the “volume required for connecting the primary combustion chamber 11 and the secondary combustion chamber 13”. Further, in the second embodiment, the connection region and the furnace pressure stabilizing chamber 12 do not overlap. Therefore, the furnace pressure stabilizing chamber 12 of the second embodiment has a volume larger than the "volume of the connection region connecting the primary combustion chamber 11 and the secondary combustion chamber 13".

In this way, by providing the furnace internal pressure stabilizing chamber 12 in any form, the effect of stabilizing the furnace internal pressure can be exhibited. Furthermore, in the situation of designing a new fluidized bed type processing furnace based on the existing fluidized bed type processing furnace, when the connection area of the base fluidized bed type processing furnace is increased, this enlarged part becomes the furnace. It corresponds to the internal pressure stabilization chamber 12.

<Specific Volume of Internal Pressure Stabilization Chamber 12> Next, with reference to FIG. 3, the volume of the internal pressure stabilization chamber 12 capable of sufficiently stabilizing the internal pressure of the furnace will be described. Although the furnace pressure stabilizing chamber 12 of the second embodiment is shown in FIG. 3, the same calculation method can be applied to the furnace pressure stabilizing chamber 12 of the first embodiment.

As the capacity of the furnace pressure stabilizing chamber 12 is increased, the furnace pressure is less likely to change, so that the furnace pressure can be stabilized. However, as the capacity of the furnace pressure stabilizing chamber 12 increases, the space of the fluidized bed processing furnace 10 increases and the heat loss increases. Therefore, it is preferable that the furnace pressure stabilizing chamber 12 has a necessary and sufficient volume.

As described above, the cause of the rapid increase in the amount of the mixed gas generated is a change in the properties and the amount of waste supplied to the primary combustion chamber 11. More specifically, particularly in the fluidized bed type processing furnace 10, the amount of the mixed gas generated increases as the amount of water contained in the waste supplied per unit time increases. This point is also demonstrated by simulations performed by the applicant.

Therefore, by estimating the amount of water contained in the waste supplied per unit time, it is possible to estimate the degree of increase in the amount of mixed gas generated. If the degree of increase in the amount of the mixed gas generated can be estimated, the volume of the furnace pressure stabilizing chamber 12 required to stabilize the furnace pressure can be specified.

Specifically, the desired volume of the furnace pressure stabilizing chamber 12 can be calculated by using the formulas (1) and (2) shown in FIG. The values described in the formulas (1) and (2) are as follows.
C (%): Estimated value of the magnitude of fluctuation in the water content of the waste at the time of being put into the primary combustion chamber 11. For example, the water content of the currently supplied waste is in the range of 10% to 60%. In the case of, 50 which is the difference between 10% and 60% is C.
D (kg): Estimated value of the maximum value of the mass per waste at the time of being put into the primary combustion chamber 11. The mass per waste naturally varies, but the maximum value is D. Further, one waste is a mass of waste that is integrally supplied when it is supplied to the primary combustion chamber 11.
E (m ³ N / h): Flow rate (normal flow rate) of the mixed gas released from the primary combustion region in the steady state in the standard state.
The steady state is a state in which an abnormality such as a continuous increase in the mixed gas has not occurred.
F (m ³ ): Volume of the primary combustion region α: Coefficient β (m ³ ): Volume of the furnace pressure stabilization chamber 12 Note that C and D are the tendency of waste supplied to the fluidized bed processing furnace 10. It is inferred from the data showing. Further, E is calculated by simulation, experiment, or the like.

The denominator of equation (1) is the standard amount of mixed gas generated in the steady state. Specifically, by dividing E by 60 and further dividing by 6, the volume of the mixed gas generated per 10 seconds in the steady state in the standard state is calculated.

The molecule of the formula (1) is an index value for how rapidly the amount of water contained in the waste increases. Therefore, the larger the molecule of the formula (1), the larger the amount of increase in the mixed gas tends to be. Specifically, in the molecule of formula (1), the water content is converted from a percentage to a multiple by dividing C by 100. Further, since the change in the water content is assumed to be half the difference between the maximum value and the minimum value of the water content, C / 100 is further divided by 2. As a result, an index of the amount of change in the water content is calculated. Then, by multiplying C / 200 by D, an index of the amount of change in the amount of water (mass) is calculated. The index is divided by the molecular weight of water (18) to convert it to the amount of substance (kmol), and the volume in the standard state (22.4) is integrated with this amount of substance. As a result, the index of the amount of change in the amount of water contained in the waste can be converted into the volume of the gas in the standard state.

Since the meanings of the numerator and denominator of the formula (1) are as described above, the coefficient α is an index indicating the magnitude of the change in the furnace pressure. That is, the larger the coefficient α, the larger the amount of increase in the furnace pressure is likely to be.

In the formula (2), it is specified that the volume of the furnace pressure stabilizing chamber 12 is larger than the value obtained by integrating the coefficient α with the volume of the primary combustion region.

By determining the volume of the furnace pressure stabilizing chamber 12 so as to satisfy the formulas (1) and (2), fluctuations in the furnace pressure can be sufficiently suppressed even if the mixed gas suddenly increases.

It is preferable that α is calculated using the equation (1). However, since α is not a value that greatly changes depending on the fluidized bed type processing furnace 10, the volume of the internal pressure stabilization chamber 12 may be determined by setting α as a fixed value. According to the knowledge of the applicants, an appropriate volume of the furnace pressure stabilizing chamber 12 can be calculated by setting α = 0.3.

As described above, the fluidized bed type processing furnace 10 of the above embodiment includes a primary combustion chamber 11, a secondary combustion chamber 13, and an in-core pressure stabilizing chamber 12. The primary combustion chamber 11 has a primary combustion region. The primary combustion region is a region for supplying a fluidizing gas to a fluidized medium and primary combusting waste in a state where the fluidized medium is fluidized. The secondary combustion chamber 13 has a secondary combustion region. The secondary combustion region is a region for performing secondary combustion in which the primary combustion gas including the unburned gas generated in the primary combustion is burned. The furnace pressure stabilizing chamber 12 is a space connected to the primary combustion chamber 11. In the furnace pressure stabilization chamber 12, primary combustion and secondary combustion have not occurred. The furnace pressure stabilizing chamber 12 has a large volume as compared with the volume required for connecting the primary combustion chamber 11 and the secondary combustion chamber 13, and stabilizes the pressure of the gas in the furnace.

As a result, even when the mixed gas discharged from the fluidized bed suddenly increases, the mixed gas immediately diffuses into the furnace pressure stabilizing chamber, so that the increase in the furnace pressure can be suppressed. Therefore, the pressure inside the furnace can be stabilized.

Further, in the fluidized bed type processing furnace 10 of the above embodiment, the volume of the furnace pressure stabilizing chamber 12 satisfies the formulas (1) and (2) shown in FIG. Alternatively, the volume of the furnace pressure stabilizing chamber 12 satisfies the equation (2) with α as 0.3.

As a result, the furnace pressure stabilizing chamber 12 has a volume required for stabilizing the furnace pressure, so that the effect of stabilizing the furnace pressure can be fully exerted.

Although the preferred embodiment of the present invention has been described above, the above configuration can be changed as follows, for example.

In the above embodiment, since the primary combustion chamber 11 and the secondary combustion chamber 13 are physically separated, the boundary between the primary combustion chamber 11 and the secondary combustion chamber 13 is clear. Instead of this, the fluidized bed type processing furnace 10 may have one space, and the primary combustion chamber 11 and the secondary combustion chamber 13 and the connection region may exist in this space so as to be continuous.

In the second embodiment, the primary combustion chamber 11 and the furnace pressure stabilizing chamber 12 are connected via a large-diameter duct, but the furnace pressure stabilizing chamber 12 is directly connected to the primary combustion chamber 11. May be good.

10 Fluidized bed processing furnace 11 Primary combustion chamber 12 Internal pressure stabilization chamber 13 Secondary combustion chamber

Claims (1)

A primary combustion chamber having a primary combustion region for primary combustion of waste in a state where a fluid gas is supplied to a fluid medium and the fluid medium is fluidized.
A secondary combustion chamber having a secondary combustion region for performing secondary combustion for burning the primary combustion gas including the unburned gas generated in the primary combustion, and
It is a space connected to the primary combustion chamber, in which the primary combustion and the secondary combustion do not occur, and compared with the volume required to connect the primary combustion chamber and the secondary combustion chamber. It has a large volume, and has a furnace pressure stabilization chamber for stabilizing the pressure of the gas in the furnace, and
Equipped with a,
Let C (%) be the estimated value of the fluctuation of the water content in the waste at the time of being put into the primary combustion chamber.
Let D (kg) be the estimated value of the maximum mass per waste at the time of being put into the primary combustion chamber.
The normal flow rate of the gas released from the primary combustion region in the steady state is E (m ³ N / h).
When the volume of the primary combustion region is F (m ³ ),
^{Β (m 3} ) indicating the volume of the furnace pressure stabilization chamber is
α = (D x C / 200 x 1/18 x 22.4) / (E x 1/60 x 1/6)
β> α × F
A fluidized bed processing furnace characterized by satisfying.

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