JP6716398B2 - Exhaust gas treatment device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an exhaust gas treatment device for neutralizing acid gas in combustion exhaust gas discharged from a combustion device such as a waste incinerator and for collecting dust.

The combustion exhaust gas discharged from the waste incinerator contains not only soot dust (fly ash) but also acid gases such as hydrogen chloride (HCl) and sulfur oxides (SO _x ). The acidic gas is also called a harmful gas component.

As a method of removing this type of acidic gas from the combustion exhaust gas, a method of supplying slaked lime in the form of powder in the combustion exhaust gas and then guiding the combustion exhaust gas to a dust collector to perform dust collection processing is widely used. In this method, the acid gas in the combustion exhaust gas is absorbed by the slaked lime by reacting with the slaked lime to form a salt, and then the slaked lime that absorbed the acid gas is collected together with the soot and dust by the dust collector, and burned. Acid gas is removed from the exhaust gas.

By the way, in the waste incinerator, the amount of combustion exhaust gas may fluctuate, and the ratio of acid gas in the combustion exhaust gas may change depending on the properties of the waste to be incinerated. Therefore, in general, slaked lime is supplied to the combustion exhaust gas in an amount, for example, twice as much as the equivalent ratio with respect to the acidic gas assumed to be contained in the combustion exhaust gas. Therefore, the dust collected from the dust collector contains a certain proportion of the slaked lime supplied to the combustion exhaust gas in an unreacted state.

Therefore, as one of the methods for effectively utilizing the unreacted slaked lime contained in the dust collection dust, the dust collection dust discharged from the dust collector is subjected to a fine powder classifier to remove the unreacted slaked lime into fly ash and reacted. It has been conventionally proposed to separate the slaked lime based on the difference in average particle size from the slaked lime, and to circulate and supply the separated unreacted slaked lime into the combustion exhaust gas (see, for example, Patent Document 1).

JP, 2001-219030, A

However, in the method disclosed in Patent Document 1, it is necessary to classify the unreacted slaked lime based on the classified particle size of about 7 μm. In addition, in the one disclosed in Patent Document 1, unreacted slaked lime, reacted slaked lime, and unreacted slaked lime from dust collection dust which is a mixture of particles having different physical properties such as particle density called fly ash, It is necessary to sort only on the basis of particle size.

Therefore, the slaked lime that can be used is limited to those having an average particle size that can be separated from the fly ash or the reacted slaked lime by classification, and the function shown in Patent Document 1 has the function of performing precise classification. A fine powder classifier equipped is required.

Therefore, the present invention, it is possible to effectively utilize the unreacted portion of the chemical for acid gas removal such as slaked lime contained in the dust collected from the dust collector, and the classification treatment of the dust collected by the classifier. The present invention aims to provide an exhaust gas treatment device that does not require it.

In order to solve the above problems, the present invention provides a dust collector, an inlet side flue connected to a gas inlet of the dust collector to guide combustion exhaust gas to the gas inlet, and a chemical supply nozzle provided in the inlet side flue. And a circulating material supply nozzle, a fluidized bed device connected to a dust outlet for discharging dust collecting dust from the dust collector, and a circulation line connecting an outlet of the fluidized bed device to the circulating material supply nozzle. The fluidized bed apparatus includes a container in which a fluidized medium is arranged, and a dust inlet for supplying dust collecting dust from the dust collector into the container, and the container is arranged below the container. And a region arranged on the upper side of the wind box to form a fluidized bed by the fluidized medium, the wind box includes a plurality of divided compartments, the fluidized bed apparatus, The flowing air is supplied to the flowing medium in each of the regions through each of the plurality of divided sections to generate a circulatory flow of the flowing medium in the container, and the flowing air is supplied to the flowing medium. Exhaust gas treatment having a configuration in which the flow rate and the flow rate of air are different between a position in the container where the dust collecting dust supplied from the dust inlet falls and a position in the container away from the drop position. The device.

The fluidized bed apparatus, prior Symbol dust dust collector supplied from the dust inlet was triturated with fluidized bed formed by the fluidized medium and dust pulverized product, conveying the dust pulverized by the flow of the fluidizing air to some as configuration discharged from the outlet.

The fluidized bed apparatus is configured to lower the fluidized medium at the dropping position and raise the fluidized medium at a position in the container away from the dropping position.
Further, there is as comprising a flow regulating valve for regulating the supply quantity of the fluidizing air to each of the divided sections of the multiple configurations.
In addition, the dust inlet is disposed on one side closer position of the container, the outlet is disposed on the other side near the position of the container, supplied to the fluid medium from said dividing partition positioned in the dust inlet side The flow rate and the flow rate of the flowing air are smaller than the flow rate and the flow rate of the flowing air supplied to the flowing medium from the divided section located on the outlet side.
Furthermore, the dust inlet is arranged on the center side of the container, the outlet is arranged on the outer peripheral side of the container, and the flow medium is supplied to the fluidized medium from the divided section located on the outlet side. The flow rate and the flow rate of the air are larger than the flow rate and the flow rate of the flowing air supplied to the fluidized medium from the divided section located on the dust inlet side.
Furthermore, a dust collector, an inlet side flue that is connected to a gas inlet of the dust collector and guides combustion exhaust gas to the gas inlet, a chemical supply nozzle and a circulating matter supply nozzle provided in the inlet side flue, and the dust collector A fluidized bed device connected to a dust outlet for discharging dust collecting dust from, and a circulation line connecting an outlet of the fluidized bed device to the circulating material supply nozzle, the fluidized bed device comprising: A container in which a fluidized medium is arranged, and a dust inlet for supplying dust collecting dust from the dust collector into the container, the container is a wind box arranged below the container, and the wind box. A region where the fluidized bed is formed by the fluidized medium, and a dispersion plate that partitions the air box and the region, the dispersion plate having a plurality of openings and a plurality of openings. The opening includes a first opening having a first opening ratio and a second opening having a second opening ratio different from the first opening ratio, and the fluidized bed apparatus supplies the flowing air to the first opening. The fluidizing medium in the region is supplied through the first opening and the second opening to generate a circulation of the fluidizing medium in the container, and the flow rate of the flowing air supplied to the fluidizing medium and The flow velocity is set to be an exhaust gas treating apparatus having a configuration in which the dust collection dust supplied from the dust inlet falls in a drop position in the container and a position in the container separated from the drop position.

According to the exhaust gas treatment apparatus of the present invention, it is possible to effectively use the unreacted portion of the chemical agent for removing the acidic gas contained in the dust collected from the dust collector. In addition, when the chemicals are effectively used, classification processing of dust collection dust by a classifier can be omitted.

It is a schematic diagram showing an embodiment of an exhaust gas treatment equipment. It is a figure which expands and shows the fluidized bed apparatus in FIG.

Hereinafter, an exhaust gas treatment apparatus of the present invention will be described with reference to the drawings.

FIG. 1 is a partially cut schematic side view showing an embodiment of an exhaust gas treatment device. FIG. 2 is a cutaway side view showing the fluidized bed apparatus shown in FIG. 1 in an enlarged manner.

As shown in FIG. 1, the exhaust gas treatment apparatus of this embodiment is provided in a bag filter 1 as a dust collector, an inlet side flue 3 connected to a gas inlet 2 of the bag filter 1, and an inlet side flue 3. The chemical supply nozzle 4 and the circulating material supply nozzle 5, the fluidized bed apparatus 7 connected to the dust discharge port 6 of the bag filter 1, and the circulation line 9 connecting the outlet 8 of the fluidized bed apparatus 7 to the circulating material supply nozzle 5. And is configured to include.

The bag filter 1 is provided with a tubular container 10 having a rectangular cross section and extending in the vertical direction and having a hopper shape in the lower portion. The container 10 is provided with a gas inlet 2 on the side portion near the lower portion and a gas outlet 11 on the side portion on the upper end portion. The bottom of the container 10 is provided with, for example, a screw conveyor type dust discharging device 12, and a dust discharging port 6 is provided below the destination side of the dust discharging device 12.

A cell plate 13 having a plurality of filter cloth attachment holes 14 opened is airtightly attached at a position below the gas outlet 11 in the upper portion of the container 10. Each filter cloth attachment hole 14 of the cell plate 13 supports an upper end portion of a retainer (not shown) in which a cylindrical and slender bag-like filter cloth 15 is covered and held from the lower side to the outer peripheral side. .. Thereby, the retainers and the filter cloths 15 are suspended below the cell plate 13, and in this state, the upper end openings of the filter cloths 15 are connected to the cell cloths through the corresponding filter cloth attachment holes 14. It communicates with the space above the plate 13. Further, a backwash device 16 used for backwashing each filter cloth 15 is provided above the cell plate 13 in the container 10.

The inlet side flue 3 connected to the gas inlet 2 guides the combustion exhaust gas 17 discharged from a combustion device (not shown) such as a waste incinerator to the gas inlet 2.

An outlet side flue 18 is connected to the gas outlet 11, and an unillustrated downstream side device such as an induced draft fan is connected to the downstream side of the outlet side flue 18.

As a result, in the bag filter 1, the combustion exhaust gas 17 flowing from the inlet side flue 3 through the gas inlet 2 into the container 10 passes through each filter cloth 15 from the outside to the inside and then flows toward the gas outlet 11. Become. Therefore, solid particles (not shown) such as soot and dust contained in the combustion exhaust gas 17 are collected by each filter cloth 15. Therefore, the combustion exhaust gas 17 is cleaned by removing the solid particles collected on each filter cloth 15, and the cleaned exhaust gas 17 a is discharged from the gas outlet 11 to the outlet side flue 18. ..

In the bag filter 1, when the process of collecting the solid particles in the combustion exhaust gas 17 by each filter cloth 15 is continuously performed, the collected solid particles are accumulated on the outer surface side of each filter cloth 15. Therefore, in the bag filter 1, in order to prevent the pressure loss from becoming excessive, the backwashing process of each filter cloth 15 by the backwashing device 16 is performed regularly or at every set operating time, and The deposit adhered to the outer surface of the filter cloth 15 is wiped off. The solid matter that is naturally dropped from each filter cloth 15 or is washed off by the backwash process and dropped on the inner bottom portion of the container 10 is sent to the dust discharge port 6 by the dust discharge device 12, and the dust discharge port 6 is discharged. 6 is discharged as dust collecting dust 19.

The chemical supply nozzle 4 is provided in the inlet side flue 3 at a position separated from the gas inlet 2 on the upstream side by a set distance.

The medicine supply nozzle 4 has a function of supplying, for example, slaked lime 20 into the inlet side flue 3 as a medicine for acid gas removal. In addition, it is preferable that the chemical supply nozzle 4 is of a type in which the slaked lime 20 is injected onto the flow of the carrier gas. According to the chemical supply nozzle 4 of this type, the slaked lime 20 is supplied to the combustion exhaust gas 17 flowing in the inlet side flue 3 toward the gas inlet 2 of the bag filter 1 in a state in which the dispersibility is enhanced. You can As a result, the slaked lime 20 can efficiently make contact with the acid gas contained in the combustion exhaust gas 17.

The slaked lime 20 dispersed in the combustion exhaust gas 17 is conveyed to the bag filter 1 by the flow of the combustion exhaust gas 17, and is also collected by the filter cloth 15 in the bag filter 1 together with soot dust (not shown). Therefore, the dust collection dust 19 discharged from the dust discharge port 6 contains the slaked lime 20 in addition to the soot dust.

In the present embodiment, the slaked lime 20 supplied from the chemical supply nozzle 4 is supplied in an amount that becomes excessive at a set ratio over the equivalent ratio to the acidic gas that is assumed to be contained in the combustion exhaust gas 17. To do. Therefore, the slaked lime 20 contained in the collected dust 19 contains the reacted one that has absorbed the acidic gas and the unreacted one.

If the chemical supply nozzle 4 can supply the slaked lime 20 to the combustion exhaust gas 17 flowing through the inlet side flue 3 while dispersing the slaked lime 20, the chemical supply nozzle 4 can use any form other than the type that injects the slaked lime 20 using the carrier gas. Of course, it is also possible to adopt the above.

An inlet 22 of the distribution device 21 is connected to the dust outlet 6.

The distributor 21 comprises two outlets 23, 24, the first outlet 23 being connected to the ash treatment device 25 and the second outlet 24 being connected to the dust inlet 26 of the fluidized bed device 7. Further, the distribution device 21 has a function of distributing the collected dust 19 received from the dust discharge port 6 of the bag filter 1 through the inlet 22 to the first outlet 23 and the second outlet 24 at a set ratio. There is. The distribution of the dust collection dust 19 in the distribution device 21 is performed by a switching device such as a valve or a flap (not shown) provided inside the distribution device 21 so that the first outlet 23 communicates with the inlet 22. The state in which the second outlet 24 communicates with the inlet 22 may be switched at a set time interval.

It is needless to say that the dust collection dust 19 in the distribution device 21 may be distributed to the first outlet 23 and the second outlet 24 by a method other than the above-described time-based switching. Although not shown, as an example, the distribution device 21 separates a certain amount of the dust collection dust 19 from the dust collection dust 19 moving from the inlet 22 toward the first outlet 23, and the second outlet 24. It may be configured to include means for sending to. Further, as another example, the distribution device 21 includes two branch passages communicating with the outlets 23 and 24 on the downstream side of the passage that guides the dust collecting dust 19 from the inlet 22, and the cross-sectional area of each branch passage is You may provide the structure used as the set ratio.

Further, the dust collecting dust 19 sent from the distribution device 21 to the fluidized bed device 7 via the second outlet 24 is subjected to a treatment described later in the fluidized bed device 7 and then passed through the circulation line 9 and the circulating material supply nozzle 5 to the inlet. It is supplied to the combustion exhaust gas 17 flowing through the side flue 3. In view of this point, the amount of the dust collecting dust 19 to be distributed to the second outlet 24 side, that is, the fluidized bed apparatus 7 side in the distribution apparatus 21, is determined by the capacity of the fluidized bed apparatus 7 and the inlet side flue 3. It may be determined according to the flow rate or flow velocity of the combustion exhaust gas 17 that is generated.

The dust collecting dust 19 discharged from the first outlet 23 of the distribution device 21 is sent to the ash processing device 25. In the ash processing device 25, the same processing as the conventional dust collection dust processing such as fixing of heavy metals is performed.

In the present embodiment, the fluidized bed device 7 is configured as shown in FIG. 2, for example.

The fluidized bed apparatus 7 includes a cylindrical container 27 extending in the vertical direction. A dust inlet 26 is provided at a position closer to one side of the upper end of the container 27 (a position closer to the right side in FIG. 2), and the dust inlet 26 is connected to the second outlet 24 of the distributor 21. Therefore, in the fluidized bed apparatus 7 of the present embodiment, the dust collecting dust 19 is dropped and supplied from the dust inlet 26 to a position in the container 27 that is close to one side. Although not shown, the dust inlet 26 is provided with a means such as a double damper for supplying the collected dust 19 while preventing the backflow of air from the inside of the container 27.

An outlet 8 is provided at a position away from the dust inlet 26 on the upper end side of the container 27, for example, at a position closer to the other side (position closer to the left side in FIG. 2). In this way, the outlet 8 is provided separately from the dust inlet 26, because the air flows toward the outlet 8 in the container 27, and the dust collection dust 19 dropped and supplied from the dust inlet 26 will be described later due to the influence of the air flow. This is to prevent the fluidized bed 7a from being blown off before it reaches the fluidized bed 7a. Therefore, if the dust collection dust 19 dropped and supplied from the dust inlet 26 can be made less susceptible to the influence of the air flow toward the outlet 8 in the container 27, the arrangement of the dust inlet 26 and the outlet 8 is, for example, one side. Alternatively, both of them may be arranged near the upper end of the side wall of the container 27, or may be arranged other than that shown in FIG.

A dispersion plate 28 is attached to a position near the lower part of the container 27 so as to partition the upper and lower spaces. The dispersion plate 28 is formed by a porous plate or a porous plate through which the fluid medium 29, which is solid particles such as alumina balls or sand, cannot pass, while allowing air to pass therethrough. The dispersion plate 28 has a strength capable of supporting the weight of the fluid medium 29 or is supported by a beam-shaped support member (not shown) capable of supporting the weight of the fluid medium 29.

The fluidized medium 29 is filled in the container 27 above the dispersion plate 28 so as to form a layer having a set thickness.

A wind box 30 is provided below the dispersion plate 28 on the lower end side of the container 27. The wind box 30 extends from below the position where the dust collecting dust 19 supplied from the dust inlet 26 falls to the side away from the dropping position, that is, in this embodiment, from one side of the container 27 to the other side. For example, it is provided with divided partitions 31a, 31b, 31c divided into three.

An air line 32 is individually connected to each of the divided sections 31a, 31b, 31c. The upstream side of each air line 32 is connected to the outlet side of the blower 34 of the flowing air 33 in a state where they are gathered together. Further, the air line 32 is provided with flow rate adjusting valves 35a, 35b, 35c for individually adjusting the flow rates of the flowing air 33 supplied to the respective divided sections 31a, 31b, 31c.

When the fluidized bed apparatus 7 is used, the blower 34 is operated to supply the flow air 33 delivered from the blower 34 to the respective divided sections 31a, 31b, 31c of the wind box 30 via the air line 32, The divided sections 31a, 31b, 31c are jetted upward through the dispersion plate 28. As a result, the flow air 33 is blown upward from below into the layer of the fluid medium 29 on the upper side of the dispersion plate 28, so that fluidization of the fluid medium 29 occurs, and the fluid plate 29 in the container 27 is discharged. The fluidized bed 7a is formed in the upper region.

Further, in the fluidized bed apparatus 7, as shown by the arrow X in FIG. 2, the fluidized medium 29 in the fluidized bed 7a descends at the position where the dust collecting dust 19 supplied from the dust inlet 26 falls. At a position distant from the position, a circulating flow in which the fluidized medium 29 rises is generated.

In order to generate this circulatory flow, in the present embodiment, the flow rate and the flow velocity of the flowing air 33 jetted upward from the divided section 31b are used as a reference with respect to the flow rate and the flow velocity of the flowing air 33 jetted upward from the divided section 31a. , So that the flow rate and the flow velocity of the flowing air 33 ejected upward from the divided sections 31c are successively increased, the supply amount of the flowing air 33 to the respective divided sections 31a, 31b, 31c is adjusted by the flow rate adjusting valves 35a, 35b,. It is adjusted by 35c. As a result, in the fluidized bed 7a, the fluidized air 29 blown in order of the fluidized medium 29 located above the divided compartment 31a, the fluidized medium 29 located above the divided compartment 31b, and the fluidized medium 29 located above the divided compartment 31c. The amount of 33 becomes large, and the apparent density becomes smaller as the flowing medium 29 in the region in which the amount of the blowing air 33 blown becomes larger. Therefore, in the fluidized bed 7a, the fluid medium 29 located above the division section 31a moves downward and the fluid medium 29 located above the division section 31c moves upward based on this apparent density difference. Like

In this way, in a state where the fluidized medium 29 is circulated in the fluidized bed 7a as indicated by the arrow X, when the dust collecting dust 19 supplied from the dust inlet 26 falls into the fluidized bed 7a, at that position, Since the downward movement of the fluidized medium 29 occurs, even if the density of the dust collection dust 19 is lower than the density of the fluidized medium 29, the dust collection dust 19 is entrained in the movement of the fluidized medium 29 to cause the dust collection dust 19 of the fluidized bed 7a to move. It can be taken inside.

In the fluidized bed 7a, collisions of the fluidized media 29 with each other and collisions of the fluidized media 29 with the wall surface of the container 27 occur frequently. And between the fluid medium 29 and the wall surface of the container 27.

By the way, in the bag filter 1 (see FIG. 1), when deposits adhering to the filter cloth 15 are washed off by backwashing and taken out as dust collecting dust 19 from the dust discharge port 6, soot dust, unreacted slaked lime, and reaction The particles such as slaked lime that have already been used may adhere to each other to form a flake-like aggregate. In the fluidized bed 7a, the agglomerates as described above contained in the dust collecting dust 19 can be crushed, so that the unreacted slaked lime 20 can be exposed to the outside.

Further, the collected dust 19 may contain, for example, reacted slaked lime in which salt is formed outside by reacting with acid gas, but in the fluidized bed 7a, such reacted slaked lime is contained. The particles of 20 can be crushed to newly expose the unreacted portion inside.

When the collected dust 19 is crushed in the fluidized bed 7a to become a dust crushed material 19a having a smaller particle size, and the flowing air 33 is conveyed by the airflow flowing toward the outlet 8, the dust crushed material 19a. Are discharged from the outlet 8 together with the flowing air 33.

The suction side of the blower 34 is preferably connected to the outlet side flue 18 via an exhaust gas suction line 36. According to this configuration, as the flowing air 33, the exhaust gas 17a that has passed through the bag filter 1 and has been cleaned can be circulated and used. Therefore, there is no need for a supply source of the flowing air 33, a filter for preventing dust and the like from mixing with the flowing air 33, and the amount of the exhaust gas 17a sent to the downstream side of the outlet side flue 18 is a flow amount. It does not increase by the amount of the working air 33.

Further, among the acidic gases contained in the combustion exhaust gas 17, even if the acidic gas that could not be removed by absorption by the slaked lime 20 remains in the exhaust gas 17a, the exhaust gas circulated as the flowing air 33 The acid gas contained in 17a can be efficiently brought into contact with the unreacted slaked lime 20 which is crushed and exposed in the fluidized bed 7a in the fluidized bed apparatus 7 to be absorbed. Therefore, the exhaust gas 17a used as the flowing air 33 can be further removed of the acidic gas.

The pulverized dust 19a discharged from the outlet 8 of the fluidized bed apparatus 7 together with the flowing air 33 is sent to the circulating substance supply nozzle 5 through the circulation line 9 and flows from the circulating substance supply nozzle 5 through the inlet side flue 3. Is blown into the combustion exhaust gas 17 As a result, the unreacted slaked lime 20 contained in the crushed dust 19a and the unreacted portion newly exposed by the crushing of the reacted slaked lime 20 absorb the acid gas in the combustion exhaust gas 17. Be seen.

As described above, according to the exhaust gas treating apparatus of the present embodiment, part of the unreacted slaked lime 20 contained in the dust collecting dust 19 discharged from the bag filter 1 is absorbed by the acid gas in the combustion exhaust gas 17. Can be used effectively. Further, even the reacted slaked lime 20 contained in the dust collection dust 19 can be crushed to absorb the acidic gas in the combustion exhaust gas 17 as long as the unreacted portion can be newly exposed. It can be effectively used.

Further, the exhaust gas treatment apparatus of the present embodiment is provided with the fluidized bed apparatus 7 so that it has a function of crushing the dust collecting dust 19 and a state in which the unreacted slaked lime 20 and the unreacted portion of the slaked lime 20 are exposed. It is possible to obtain the function of separating the crushed dust 19a from the uncrushed dust 19 or the dust that has not been sufficiently crushed and sending it to the circulating material supply nozzle 5 of the inlet side flue 3.

Therefore, in the exhaust gas treatment apparatus of the present embodiment, since the dust collection dust 19 discharged from the bag filter 1 need only be supplied to the fluidized bed apparatus 7 in a predetermined amount, the particle size of the unreacted slaked lime 20 is used as a reference. As a result, it is not necessary to classify with a classifier. Therefore, the exhaust gas treatment device of this embodiment does not require a classifier as disclosed in Patent Document 1.

In addition, since a general crusher often has a mechanical rotating part such as a rotating shaft, when crushing a processing object containing salt such as the dust collecting dust 19, salt adheres to the rotating part. A special structure such as a powder seal that protects the rotating part is required so that there is no risk of deliquescence and corrosion. On the other hand, in the present embodiment, the fluidized bed apparatus 7 for pulverizing the dust collecting dust 19 has a mechanical rotating portion as well as a mechanical rotating portion at the portion in contact with the dust collecting dust 19 and the dust pulverized material 19a. Since it does not have a movable part, no special structure such as the powder seal is required.

It should be noted that the present invention is not limited to the above-described embodiment, and the dimensions of the bag filter 1, the distribution device 21, and the fluidized bed device 7 and the respective dimensional ratios are for convenience of illustration, It does not reflect the actual dimensions.

Further, if a part of the dust collecting dust 19 discharged from the dust discharging port 6 of the bag filter 1 can be supplied to the dust inlet 26 of the fluidized bed apparatus 7, it can be collected on the upstream side of the dust inlet 26. It may be configured to include a storage means such as a hopper or a bottle that temporarily stores the dust dust 19.

The arrangement of each device shown in FIG. 1 is for convenience of illustration and does not reflect the actual arrangement.

In the fluidized bed apparatus 7, the fluidized medium 29 drops in the fluidized bed 7a at the position where the dust collecting dust 19 supplied from the dust inlet 26 falls, and the fluidized medium 29 rises at the position apart from the position. If it occurs, the number of divided sections for making the flow air flow rate and the flow velocity different in the wind box 30 may be two, or four or more. Further, in the fluidized bed 7a, depending on the position where the dust collecting dust 19 is dropped and supplied, for example, the circulating medium in which the fluidized medium 29 descends at the central portion of the container 27 and rises at the outer peripheral portion, and the container 27 It is also possible to generate a circulation flow other than that shown in FIG. 2, such as a circulation flow in which the fluid medium 29 rises in the central portion and the fluid medium 29 descends in the outer peripheral portion. In this case, the arrangement of the divided compartments provided in the wind box 30 may be changed appropriately according to the arrangement of the circulation flow to be generated.

Further, the function of causing a difference in the flow rate and the flow velocity of the flowing air 33 blown from below from the wind box 30 to the layer of the fluid medium 29 through the dispersion plate 28 is, for example, a configuration in which the dispersion plate 28 is provided with regions having different aperture ratios. For example, the wind box 30 may be realized by means other than the configuration including the divided sections 31a, 31b, 31c.

Although the slaked lime 20 is illustrated as the chemical for absorbing the acidic gas, a chemical other than slaked lime may be used as long as it is a chemical conventionally used for absorbing the acidic gas, such as a chemical containing sodium.

Although the bag filter 1 is illustrated as the dust collector, if the solid particles in the combustion exhaust gas 17 can be collected by a dry method and the collected solid particles can be taken out as the dust collecting dust 19 from the dust discharge port, A dust collector other than the bag filter 1 may be adopted.

The flowing air 33 is preferably used by circulating the exhaust gas 17a, but the exhaust gas 17a may not be used. In this case, the suction side of the blower 34 may be connected to the supply part of the flowing air 33.

The arrangement of the chemical supply nozzle 4 and the circulating material supply nozzle 5 provided in the inlet side flue 3 may be reversed from the upstream side in the order shown in FIG. Further, the nozzles 4 and 5 may be arranged in the inlet side flue 3 in a circumferentially arranged arrangement.

The exhaust gas treating apparatus of the present invention may be provided with a nozzle for supplying activated carbon to the inlet side flue 3 to have a function of adsorbing and removing dioxins and the like contained in the combustion exhaust gas 17. According to this configuration, the activated carbon contained in the dust collecting dust 19 is pulverized by a part of the fluidized bed apparatus 7 to expose a new surface, and then circulated and supplied to the inlet side flue 3 for combustion. It can be effectively used for adsorption of dioxins and the like in the exhaust gas 17.

The exhaust gas processing apparatus of the present invention may process the combustion exhaust gas 17 discharged from any combustion apparatus other than the waste incinerator as long as the combustion exhaust gas 17 may contain acid gas.

Of course, various changes can be made without departing from the scope of the present invention.

1 Bag filter (dust collector)
2 gas inlet 3 inlet side flue 4 chemical supply nozzle 5 circulating material supply nozzle 6 dust outlet 7 fluidized bed device 7a fluidized bed 8 outlet 9 circulation line 17 combustion exhaust gas 19 dust collection dust 19a dust crushed material 26 dust inlet 27 container 29 Flowing medium 33 Flowing air

Claims (7)

Dust collector,
An inlet side flue which is connected to the gas inlet of the dust collector and guides combustion exhaust gas to the gas inlet,
A chemical supply nozzle and a circulating material supply nozzle provided in the inlet side flue;
A fluidized bed device connected to a dust outlet for discharging dust collecting dust from the dust collector,
A circulation line connecting the outlet of the fluidized bed apparatus to the circulating material supply nozzle,
Have
The fluidized bed apparatus,
A container in which the fluid medium is placed,
A dust inlet for supplying dust collecting dust from the dust collector into the container,
Equipped with
The container is
A wind box arranged under the container,
A region disposed on the upper side of the air box, in which a fluidized bed is formed by the fluidized medium,
Equipped with
The wind box is
Multiple divisions
Equipped with
The fluidized bed device supplies the fluidizing air to the fluidized medium in the region via each of the plurality of divided sections to generate a circulatory flow of the fluidized medium in the container,
The flow rate and the flow velocity of the flowing air supplied to the fluidizing medium are a dropping position in the container where the dust collecting dust supplied from the dust inlet falls, and a position in the container away from the dropping position. And different with,
An exhaust gas treatment device characterized by the above. The fluidized bed apparatus pulverizes the collected dust supplied from the dust inlet in a fluidized bed formed by the fluidized medium to form a dust pulverized material, and conveys the dust pulverized material by the flow of the flowing air. Discharge from the outlet,
The exhaust gas treatment device according to claim 1. The fluidized bed apparatus lowers the fluidized medium at the dropping position, and raises the fluidized medium at a position in the container away from the dropping position,
The exhaust gas treatment device according to claim 1. A flow rate adjusting valve for adjusting the supply amount of the flowing air to each of the plurality of divided sections,
Have
The exhaust gas treatment device according to claim 1 . The dust inlet is arranged at a position closer to one side of the container,
The outlet is arranged at a position closer to the other side of the container,
The flow rate and the flow velocity of the flowing air supplied to the fluidized medium from the divided section located on the dust inlet side are equal to those of the flowing air supplied to the fluidized medium from the divided section located on the outlet side. Less than flow rate and flow rate,
Exhaust gas treatment apparatus according to claim 1 or 4, wherein. The dust inlet is arranged on the center side of the container,
The outlet is arranged on the outer peripheral side of the container,
The flow rate and the flow velocity of the flowing air supplied to the fluidized medium from the divided section located on the outlet side are equal to those of the flowing air supplied to the flowing medium from the divided section located on the dust inlet side. Greater than flow rate and flow rate,
Exhaust gas treatment apparatus according to claim 1 or 4, wherein. Dust collector,
An inlet side flue which is connected to the gas inlet of the dust collector and guides combustion exhaust gas to the gas inlet,
A chemical supply nozzle and a circulating material supply nozzle provided in the inlet side flue;
A fluidized bed device connected to a dust outlet for discharging dust collecting dust from the dust collector,
A circulation line connecting the outlet of the fluidized bed apparatus to the circulating material supply nozzle,
Have
The fluidized bed apparatus,
A container in which the fluid medium is placed,
A dust inlet for supplying dust collecting dust from the dust collector into the container,
Equipped with
The container is
A wind box arranged under the container,
A region disposed on the upper side of the wind box, in which the fluidized bed is formed by the fluidized medium,
A dispersion plate for partitioning the air box and the area,
Equipped with
The dispersion plate includes a plurality of openings,
A plurality of said openings,
A first aperture having a first aperture ratio;
A second aperture having a second aperture ratio different from the first aperture ratio,
The fluidized bed apparatus supplies the fluidizing air to the fluidized medium in the region through the first opening and the second opening, respectively, to generate a circulating stream of the fluidized medium in the container,
The flow rate and the flow velocity of the flowing air supplied to the fluidizing medium are a dropping position in the container where the dust collecting dust supplied from the dust inlet falls, and a position in the container away from the dropping position. And different with,
An exhaust gas treatment device characterized by the above .

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