JP2001272017A - Method and equipment for fluidized furnace operation for incineration of marine waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency of marine waste incineration by a fluidized furnace. SOLUTION: A fluidized bed 2 is formed in the lower position of a fluidized furnace 1, in which heated primary air 21 is supplied through an air-diffuser tube 18, a fuel oil 23 is blown by an in-sand burner 24 to incinerate the marine waste. Shut-off dumpers 44a and 44b, and 44 are provided respectively to a discharge duct 8 of waste-carrying equipment 9 for supplying the marine waste into the furnace and a discharge duct 14 of waste-retaining equipment 15 for retaining the marine waste to be carried to the equipment 9. Further there are provided a thermometer 47 for detecting temperature of the fluidized bed 2 and a controller 48 for sending a shut-off command to the shut-off damper 44a, 44b, and 44, at the time when the operation of the furnace 1 is judged to be suspended based on the detected value of the thermometer 47.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for controlling the operation of a fluidized-bed furnace for incinerating marine waste such as starfish and shells of cultured scallops.

[0002]

2. Description of the Related Art Foreign matter such as starfish and the like that are caught and caught in fishery catches, and undesired materials such as shells of cultured scallops generated during the processing process have been dumped into the ocean as marine waste. Although it did not exist as waste requiring intermediate treatment, in recent years, intermediate disposal by incineration has been performed with the ban on ocean dumping.

[0003] As an incinerator for intermediate treatment of the above-mentioned marine waste, marine waste is high in moisture and contains many contaminants.
Kiln furnaces are mainly used.

However, in the case of a kiln, since the incinerated material stays in the furnace for a certain period of time and is discharged regardless of the incineration situation, it is difficult to completely incinerate the incineration residue because there are many unburned components. There's a problem.

[0005] Therefore, recently, a fluidized furnace that can completely burn incinerated materials having high moisture, low calorie and containing many incombustible substances such as shells to a burning loss value of 1% or less has been used. As an incinerator for marine waste using a fluidized-bed furnace, a fluidized bed 2 filled with sand in a lower part of the furnace and a free board 3 above the furnace are shown in FIG. The fluidized-bed furnace 1 is equipped with various operating devices.

That is, the incinerated material (marine waste) 4 put into the dust hopper 5 is sent to the side of the fluidized furnace 1 by the dust conveyor 7 driven by the drive motor 6 and passed through the discharge duct 8. A duster 9 to be discharged is connected to the discharge duct 8 via a dust chute 10, and a storage hopper 1 is provided upstream of the duster 9.
A storage device 15 is provided, in which the incineration material 4 accommodated in the storage device 1 is sent out by a discharge conveyor 13 as a discharge device driven by a drive motor 12 and discharged through a discharge duct 14. 15 discharge ducts 1
The incineration material 4 stored in the storage hopper 11 of the storage device 15 is communicated between the feeder 4 and the dust hopper 5 of the dust feeder 9 by a transport conveyor 17 driven by a drive motor 16. 13 and the conveyor 1
7 feeds to a dust feeder 9, which can feed the fluidized bed 2 of the fluidized-bed furnace 1 through a feed chute 10. The transport conveyor 17 is driven based on the operation of a level switch LS installed on the dust hopper 5 of the dust feeder 9.

In addition, an air diffuser 18 having a large number of holes is provided below the fluidized furnace 1 and a hot air generator 20 is installed in a primary air pipe 19 connected to the air diffuser 18. , Primary air (flowing air) heated by hot air generator 20
21 is blown out from the air diffuser 18 so that the temperature of the fluidized bed 2 is maintained at the incineration temperature (for example, 650 ° C.). Are installed at a plurality of locations along the longitudinal direction of the fluidized bed 2, and when the temperature of the fluidized bed 2 becomes lower than the incineration temperature, the fuel oil 23 fed through the fuel oil pipe 22 is
Is blown into sand with medium pressure air to be burned.

Further, a sand extractor 26 driven by a drive motor 25 is provided at the bottom of the fluidized furnace 1, and an outlet of the sand extractor 26 is provided upstream of a sand conveyor 28 driven by a drive motor 27. The vibrating sieve 30 as a sand separator driven by a drive motor 29 is connected to the end of the sand conveyor 28 and guided at the downstream end of the sand conveyor 28 upward.
The sand a containing the non-combustible material b extracted from the lower part of the fluidized bed 2 by the sand extracting machine 26 is sent to the vibrating sieve 30 by the sand conveyor 28 to be separated into the sand a and the non-combustible material b. On the other hand, a sand injection chute 36 having a sand injection damper 35 that is opened and closed by a drive motor 34 is connected to a side wall above the fluidized bed 2 of the fluidized furnace 1,
A sand circulating conveyor 38 driven by a driving motor 37 is provided between the upper end of the sand chute 36 and the sand outlet 32 of the vibrating sieve 30, and the sand a separated and recovered by the vibrating sieve 30 is fed to the sand circulating conveyor. A sand circulating system 39 is constructed by circulating and supplying the sand through a sand input chute 36 through the sand 38, and the incombustibles b discharged from the incombustibles outlet 33 of the vibrating sieve 30 are temporarily stored in an incombustibles container 42. It is like that. Further, a sand extraction gate 40 is provided as an excess sand extraction device at a position in the middle of the sand circulation conveyor 38, and the excess sand a of the fluidized bed 2 is extracted from the sand extraction gate 40 and discarded.

Reference numeral 41 denotes a flue gas G generated in the furnace.
2 shows an exhaust gas duct for sending air to a downstream dust collector.

[0010]

However, marine waste incineration equipment using the fluidized-bed furnace 1 has the following problems.

In other words, mollusks such as starfishes have the property of being transformed into syrup during storage, and are easy to flow out. In general, the storage device 15 is a device for discharging the contents of a screw conveyor. Since the discharge conveyor 13 is provided in a semi-open state as described above, water-soluble substances cannot be stored. On the other hand, marine waste incineration facilities are usually
At night, the operation is stopped. During the night, the processing residue of the day is often stored, and when the stored material becomes syrupy as described above, the effluent is discharged to the discharge conveyor 13 in the next morning.
In addition, the lower part of the conveyor 17 is full and the operation may not be possible. In addition, since the dust conveyor 9 is also used in the dust feeder 9 for supplying the incineration (marine waste) 4 to the fluidized furnace 1, storage leakage may occur, and the supply amount may be arbitrarily controlled. Can not be done. In such a state, the incinerated material 4 in the dust hopper 5 flows into the fluidized-bed furnace 1 irrespective of the control of the duster 9, and at this time, the incinerated material 4 is a low calorie material. As a result, not only the combustion temperature of the fluidized bed 2 is lowered and incineration becomes impossible, but also a mass of unburned matter is generated in the fluidized bed 2 and a great deal of labor is required for its removal. During that time, operation must be stopped.

Further, marine waste as incinerated material contains a large amount of solid incombustible substances such as shells, and further contains NaCl,
Since an alkali metal such as KCl forms an alkali metal salt having a low melting point, clinker is likely to be generated and normal flow is hindered, and the fluidized bed 2 may not flow locally.
On the other hand, the fluidized bed 2 is provided with a plurality of sand burners 24 for assisting combustion, and fuel oil 23 is blown.
There is a possibility that the fuel oil 23 injected into the place where the fluidized state has deteriorated as described above cannot perform normal combustion, becomes tar-like, and the fluidized bed 2 is dry-distilled and solidified, and cannot be incinerated. There is. Once the fluidization of a part of the fluidized bed 2 is solidified, the injected low calorie incinerated material 4 is in a steamed state, the non-flowable portion increases at an accelerated rate, and the entire fluidized furnace 1 becomes incinerated.

Further, a sand circulation system 39 is provided in the fluidized-bed furnace 1 to remove solid incombustible substances such as shells and clinkers generated in the fluidized bed 2 from the fluidized sand a.
Since the sand a is circulated, abrasion due to the sand a occurs in the system. Therefore, a countermeasure is taken by arranging a wear-resistant material at a key point in the system and performing the operation intermittently by a timer or the like. However, wear-resistant materials are expensive, and even if the timer is operated intermittently, sudden changes in the properties of the incinerated material 4, for example, a large amount of incombustibles are mixed or unevenly distributed, or excessive amounts of alkali metals It is not possible to cope with a sudden deterioration of the flow state due to the mixture of the fluidized bed and the like, and there is a possibility that the fluidized bed 2 is closed. If the sand circulating system 39 is continuously operated without the intermittent operation by the timer, the wear and wear of the parts increase, and the frequency of replacing expensive wear-resistant parts increases.

Further, the volume of the fluidized bed 2 is determined to be a fixed amount. However, small particles of incombustible substances such as shells remain in the fluidized bed 2 and the volume gradually increases. In order to keep the volume constant, sand a is extracted from the sand extraction gate 40 as an excess sand extraction device provided in the middle of the sand circulation system 39. In some cases, sand useful as the fluidized bed 2, and sometimes fresh sand just added, may be contained, so that the content of shells in the fluidized bed 2 will increase.
In the fluidized bed 2, high-purity silica sand for SiO ₂ is used as fluidized sand to prevent clinker formation.
When silica sand is gradually replaced by shells, the heat resistance of the fluidized bed 2 is reduced, and the fluidity of the fluidized bed 2 is deteriorated because the fluidized bed 2 is flat and not granular. In order to increase the proportion of silica sand in the fluidized bed 2 as much as possible, it is conceivable to introduce a large amount of fresh sand, but this is uneconomical. Incidentally, the vibrating sieve 30 provided in the sand circulation system 39 is generally provided with a louver type screen and separates according to the size of the particles, so that it is impossible to separate only the sand with high accuracy.

The present invention is intended to eliminate the above-mentioned problems and improve the efficiency of incineration of marine waste by a fluidized-bed furnace.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to feed heated flowing air through a diffuser tube to a fluidized bed made of sand and to remove a plurality of sands provided on the side wall of the fluidized bed portion. An outlet of a feeder for supplying incinerated material to the fluidized bed when the operation of the fluidized bed furnace is stopped by injecting fuel oil into the fluidized bed by the middle burner to incinerate marine waste as incinerated material. And an operation control method and apparatus for a marine waste incineration fluidized-bed furnace, which controls the operation so as to close an outlet of a storage device for storing incineration materials to be sent to the dust feeder via a conveyor. .

At night or the like, when the operation of the fluidized-bed furnace is stopped, if the outlet of the feeder and the outlet of the storage device are closed, even if the incinerated material is altered and becomes syrupy, In addition, outflow from the duster and the storage device is prevented.

In addition, heated fluidized air is sent through a diffuser tube to a fluidized bed made of sand, and fuel oil is blown into the fluidized bed by a plurality of sand burners installed on the side walls of the fluidized bed portion to produce incinerated material. When the temperature of each part of the fluidized bed of the fluidized-bed furnace in which the marine waste is incinerated becomes lower than a set temperature, the injection of fuel oil from the sand burner located near the part is stopped. In the early stage, it is possible to eliminate the fluidized bed solidification trouble caused by poor fuel oil combustion due to poor flow conditions by using a method and apparatus for controlling the operation of a marine waste incineration fluidized furnace that controls the operation as described above. Can be.

Further, heated fluidized air is fed into the fluidized bed made of sand through an air diffuser, and fuel oil is blown into the fluidized bed by a plurality of sand burners installed on the side walls of the fluidized bed portion, so as to be incinerated. The sand extracted from the lower part of the fluidized bed of a fluidized furnace which is designed to incinerate marine waste, so that incombustibles can be removed from the sand so that it can be circulated, and when sand circulation is stopped, When the pressure difference between the furnace pressure and the inlet pressure of the air diffuser exceeds a set value, the operation control method and apparatus of the marine waste incineration fluidized furnace for controlling the operation so as to perform sand circulation are performed, and the fluidized bed is provided. It is possible to recover the fluidized state by removing the incombustibles and the like increased in the inside.

Further, heated fluidized air is fed into the fluidized bed made of sand through a diffuser pipe, and fuel oil is blown into the fluidized bed by a plurality of sand burners installed on the side walls of the fluidized bed portion to produce incinerated material. After removing incombustibles from the sand extracted from the lower part of the above fluidized bed of a fluidized bed furnace that incinerates marine waste, the operation is controlled so that shells are further removed from the sand and then returned to the fluidized bed. The operation control method and apparatus of the marine waste incineration fluidized furnace described above can prevent the capacity of the fluidized bed from being increased by shells.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In the configuration similar to that of the marine waste incineration equipment shown in FIG. 9, the incineration material 4 in a dust hopper 5 of a dust dispenser 9 is removed. When the remaining amount exceeds a certain level, the level switch L
In addition to the drive motor 16 of the conveyor 17 and the drive motor 12 of the discharge conveyor 13 of the storage device 15,
Is stopped, and the discharge duct 14 of the storage device 15 is connected to the discharge duct 1 by the operation of the air cylinder 43.
A closing damper 44 for opening and closing the shutter 4 is installed to be openable and closable, and closing dampers 44a and 44b for closing the discharge duct 8 in the discharge duct 8 of the duster 9 by operating the air cylinders 43a and 43b. Are installed to be openable and closable in upper and lower stages at a required interval, and in the middle of an air supply line 45 to the air cylinder 43,
A control valve 46 is provided in the middle of the air supply lines 45a, 45b branched from the air supply line 45 and connected to the air cylinders 43a, 43b, respectively. A thermometer 47 for detecting the temperature of the bed 2 is installed. When it is determined based on the detected value of the thermometer 47 that the temperature of the fluidized bed 2 is low and the operation of the fluidized bed 1 is stopped, the control valve 46, A controller for controlling the closing dampers 44, 44a, 44b by controlling the closing dampers 44, 44a, 44b at the same time as controlling the driving motor 12 of the discharge conveyor 13 and the driving motor 6 of the dust feeding conveyor 7 of the storage device 15. When the temperature of the fluidized bed 2 drops abnormally during the operation of the fluidized-bed furnace 1 (for example, 550 ° C. or lower), the controller 48 a, closing the damper 44a of the upper and lower stages giving switching command alternately 46b, so as to open and close the 44b alternately.

The closing dampers 44, 44a and 44b are open during the operation of the fluidized-bed furnace 1, but when the temperature of the fluidized bed 2 is reduced by suspending the operation of the fluidized-bed furnace 1, a detection signal of the thermometer 47 is generated. Is closed by sending a control command from the controller 48 to the control valves 46, 46a, and 46b based on the control command, and at the same time, the control command from the controller 48 is transmitted to the drive motor 12 of the discharge conveyor 13 of the storage device 15 and Drive motor 6 for dust conveyor 7 of duster 9
And the driving of the discharge conveyor 13 and the feed conveyor 7 is stopped. Therefore, even if the incinerated material 4 remaining in the storage hopper 11 of the storage device 15 or the dust hopper 5 of the dust dispenser 9 is altered and becomes syrupy at night or the like, the storage device 15 and the dust hopper are not removed. It does not flow out of the machine 9.

In the above state, when the operation of the fluidized-bed furnace 1 is restarted and the temperature of the fluidized bed 2 rises to the incineration temperature, the closing dampers 44 and 44a, 44a
b is opened and the discharge conveyor 13 of the storage device 15 and the dust conveyor 7 of the dust feeder 9 are started, and the same operation control is repeated thereafter. At this time, when the level of the incineration material 4 in the dust hopper 5 rises, the discharge conveyor 13 and the transport conveyor 17 are stopped by a command from the level switch LS.

On the other hand, if the temperature of the fluidized bed 2 drops abnormally during the operation of the fluidized-bed furnace 1, a control command from the controller 48 is sent to the control valve 46 based on the detection signal of the thermometer 47.
a, 46b, the upper and lower two-stage closing dampers 44a, 44b are controlled to be opened and closed alternately. As a result, the incinerated material 4 can be supplied from the duster 9 to the fixed-rate fluidized-bed furnace 1, and the incinerated material 4 is not injected into the fluidized bed 2 in an uncontrolled state, and the temperature of the fluidized bed 2 is incinerated. The temperature can be raised and maintained.

Therefore, the incineration efficiency of marine waste as incineration 4 can be improved.

Next, FIGS. 2 and 3 show another embodiment of the present invention. In the same construction as shown in FIG. A burner control controller for providing thermometers 49 in the vicinity of the burners 24 and sending an open / close command to a control valve 50 provided in the fuel oil pipe 22 of each submerged burner 24 based on a detection signal from each thermometer 49. 51 to the burner 24 in the sand located in the part of the fluidized bed 2 where the temperature has been lowered.
Is stopped.

The burner control controller 51 comprises:
As shown in detail in FIG. 3, an average calculator 52 for averaging the fluidized bed temperature detected by each thermometer 49, and an average calculated by the average calculator 52 and the individual thermometers 49. Set temperature (for example, 50 ° C) by comparing with the detected value
As described above, when the detected value is decreased, the comparison arithmetic unit 54 outputs a shut-off command to the control valve 50 corresponding to the burner 24 in the sand near the corresponding thermometer 49 via the command unit 53, and When one of the middle burners 24 stops, an alarm is issued via an alarm controller (not shown).

The temperatures of the two fluidized beds detected by the respective thermometers 49 are input to an average value calculator 52 to calculate an average value.
Next, the difference from the average value is calculated by the comparison arithmetic unit 54, and when the difference from the average value is equal to or higher than the preset temperature, the corresponding command unit 53 is activated to activate the control valve 50. When the fuel oil 23 is closed, the injection of the fuel oil 23 from the corresponding sand burner 24 is stopped. This allows
Obstacles such as solidification of the fluidized bed 2 due to poor combustion of the fuel oil 23 due to poor flow conditions can be eliminated at an early stage.
There is no need to remove the solidified portion.

Therefore, the incineration efficiency of the incinerated material 4 can be improved.

FIG. 4 shows still another embodiment of the present invention. In the same configuration as shown in FIG.
Gas pressure of free board 3 as furnace pressure and diffuser 18
A differential pressure transmitter 55 for obtaining a difference from the air pressure in the primary air pipe 19 which is the inlet pressure of the air is provided, and when the pressure loss, which is the obtained differential pressure, exceeds a set value (for example, 1 Pa), sand Drive motor 25 of sand extractor 26 constituting circulation system 39
, A drive motor 27 for the sand conveyor 28, and the vibrating sieve 3
0, a drive motor 37 of a sand circulation conveyor 38, and a drive motor 34 of a sand introduction damper 35 provided on a sand introduction chute 36 to drive the sand circulation system 39, thereby the fluidized bed 2 It is intended to be able to recover from the rapid deterioration of the current flow situation.

When the medium pressure primary air 21 from a not-shown primary blower is blown into the fluidized bed 2 as fluidized air through the diffuser 18, the fluidized bed 2 becomes fluidized.
Although the resistance to the primary air 21 blown from the air diffuser 18 sharply decreases, conversely, an element that causes poor flow occurs in the fluidized bed 2 and the flow becomes inactive. Rapidly increases, and when the differential pressure between the air pressure at the inlet of the diffuser 18 and the gas pressure in the furnace is detected by the differential pressure transmitter 55, it is possible to determine the pressure loss of the fluidized bed 2, that is, the air resistance. it can. Therefore, the pressure loss is set to a constant value (for example, 1 Pa), and when the fluidized state of the fluidized bed 2 deteriorates and exceeds the set value, the sand pressure of the sand circulating system is increased by the operation of the differential pressure transmitter 55. 39 is activated and fluidized bed 2
The incombustible material such as shells or clinker generated therein is removed by the vibrating sieve 30 and the incombustible material container 42 is removed.
If it is excluded, the recovery of the flow state and the further deterioration of the flow state can be prevented.

In the above case, when the fluidized state of the fluidized bed 2 deteriorates and the sand circulating system 39 is activated by the differential pressure transmitter 55 with an increase in the pressure loss of the fluidized bed 2, incombustible substances and the like in the fluidized bed 2 are removed. Since it is gradually removed, the set value of the pressure loss can be changed so as to activate the sand circulation system 39 in consideration of the time difference. The operation of the sand circulation system 39 causes the fluidized bed 2
When the pressure loss decreases to a value equal to or lower than the set value, the sand circulation system 39 is stopped by the operation of the differential pressure transmitter 55. The set values of the differential pressure transmitter 55 for starting and stopping the sand circulating system 39 are not the same values but can be appropriately determined so as not to cause hunting. Since the operation of the sand circulation system 39 is limited to the minimum required time, the frequency of replacing the wear-resistant parts can be minimized.

Therefore, the incineration efficiency of the incinerated material 4 can be improved.

FIG. 5 shows still another embodiment of the present invention. In the same configuration as that shown in FIG. 9, a vibrating sieve 30 having a louver type screen is used instead of a sand separator. A vibrating sieve equipped with a screen made of a perforated plate is used as the coarse sand separator 56, and a fine sand separator 65 is provided downstream of the sand discharge gate 40.
5 is a sand collection conveyor 5 in which the sand outlet 57 is vertically arranged.
8 and an outlet 60 at the upper end of the sand collection conveyor 58 is connected to a sand return port 61 provided downstream of the sand discharge gate 40 of the sand circulation conveyor 38.
Connected to.

The coarse sand separator 56 is shown in FIG.
As shown in FIG.
The inside of the box-shaped casing 64 which is inclined and installed so as to vibrate through the elastic force of 3 is divided into two upper and lower stages by a screen 66 having a large number of holes 66a having a diameter of 3 to 4 mm. The sand a containing the incombustible material b is supplied from the inlet 67 provided, and the sand a passing through the hole 66a of the screen 66 is discharged from the sand outlet 68 provided downstream of the lower section. The non-combustible material b that has not been discharged is discharged from the non-combustible material outlet 69.

The fine sand separator 65 is shown in FIG.
As shown in an example, a table 71 having a long rectangular shape in the front-rear direction and having a shape in which weirs 70 are provided at the rear end and left and right ends and only the front end is opened is provided. The required range is partitioned left and right by partition walls 72 along the front-rear direction, and the right partition is cut off, and the entire table 71 is installed diagonally inclining so that the cut-out portion is the lowest, and cut off. The formed right front end opening portion is a sand outlet 57, the remaining left front end opening portion is a shell outlet 73, and a sand extraction gate is placed on the highest left rear end portion of the table 71. A sand supply port 74 for dropping and feeding the roughly separated sand a pulled out from the container 40 obliquely forward is provided. Further, the table 71 is equipped with a drive motor 75 for applying a vibration force in the front-back direction. By supplying the sand a through the sand supply port 74 on the table 71 that is vibrating,
The sand a and the shells c mixed in the sand a are separated from each other by the difference in the degree of rolling based on the difference in the shape of the sand a and the sand a
In addition, the shells c are separated and discharged from the upper shell outlet 73, respectively.

The sand a including the non-combustible material b extracted from the lower part of the fluidized bed 2 by the sand extractor 26 is transferred to the sand conveyor 2.
8, the mixture is put into a coarse sand separator 56, where it is roughly separated into sand a and incombustible material b. In this case, FIG.
As shown in the figure, the sand a containing the noncombustible material b supplied into the casing 64 of the coarse sand separator 56 is a screen 6 made of a perforated plate.
6, when the sand a slides down on the hole 66 of the screen 66.
Since it passes through a and is separated into sand a and incombustibles b, there is no possibility that pieces of shells or the like are clogged in the holes 66 a of the screen 66 to cause blockage. That is, the vibrating sieve 30 used as a conventional sand separator mainly employs a screen made of a thin steel plate formed into a louver shape as a screen, but in a louver type screen,
Flat shell fragments tend to cause clogging and may not be able to separate sand a. However, in the case of the screen 66 made of a perforated plate as described above, clogging is caused by flat shell fragments. It does not happen.

However, the sand a separated by the coarse sand separator 56 using the screen 66 made of a perforated plate contains shells c having the same particle size as the sand a. When the fluidized bed 2 is charged, the volume of the fluidized bed 2 gradually increases.
Is extracted from the sand extraction gate 40 in the middle of the process, and only the sand a is separated by the fine sand separator 65. In this case, as shown in FIGS.
When the sand a including the shells c is supplied through the sand supply port 74 onto the left rear end of the table 71 vibrated in the front-rear direction by the driving of the drive motor 75, the sand a easily rolls. It moves to the lowest position while being largely deflected to the right along the slope of 71, and is discharged from the sand outlet 57. On the other hand, since the shells c are less likely to roll than the sand a, the front is mainly in the vibration direction. To be discharged from the shell outlet 73.

The shells c separated in the sand separator 65 in this way are collected in the noncombustible container 42 and the sand a
Is returned to the middle of the sand circulation conveyor 38 by the sand recovery conveyor 58, and is returned to the fluidized bed 2 through the sand charging chute 36. This can prevent the volume of the fluidized bed 2 from increasing.

Therefore, the efficiency of incineration of marine waste by the fluidized-bed furnace 1 can be improved.

Next, FIGS. 8A and 8B show the sand circulation system 3.
9 shows another example of the fine sand separator 65 used in FIG. 9, in which a V-shaped trough 76 is arranged so as to be inclined so that the front end is lowered, and the trough 76 is vibrated in the front-rear direction by a drive motor 75. A sorting plate 77 is attached to the front end of the trough 76 so as to partition the inside of the trough 76 into upper and lower regions, and a part of the front end of the trough 76 in the lower region of the sorting plate 77 is cut off. Sand exit 57
At the same time, the front end of the upper region of the sorting plate 77 is used as a shell outlet 73 and the sand supply port 7 above the rear end of the trough 76.
The sand a containing the shells c supplied into the trough 76 from 4,
Sorted up and down by the difference in bulk specific gravity between shells c and sand a,
The sand a is separated and discharged from the lower sand outlet 57, and the shells c are separated and discharged from the upper shell outlet 73.

Even when the fine sand separator 65 shown in FIGS. 8 (a) and 8 (b) is used, the same operation and effect as in the case where the fine sand separator 65 shown in FIGS. 7 (a) and 7 (b) are used can be obtained. .

It is to be noted that it is optional to appropriately combine the operation control devices of the fluidized-bed furnace described in each of the above embodiments.
Of course, various changes can be made without departing from the scope of the present invention.

[0045]

As described above, according to the present invention, heated fluidized air is fed into a fluidized bed made of sand through an air diffuser, and a plurality of burners in the sand provided on the side wall of the fluidized bed portion are used to fluidize the fluidized bed. When the fluidized-bed furnace is inactive so as to incinerate marine waste as incineration by injecting fuel oil into the fluidized bed, an outlet of a duster for supplying incineration to the fluidized bed, and Marine waste incineration fluidized-bed furnace, which controls the operation so as to close the outlet of the storage device that stores the incineration material to be sent to the machine via the conveyor, so that it can be used at night, etc. Even if the incinerated material changes into a syrup-like shape, it can be prevented from flowing out of the duster and the storage device. Floor The fuel oil is blown into the fluidized bed by a plurality of sand burners installed on the side walls of the fluidized bed, and the temperature of each part of the fluidized bed of the fluidized bed of a fluidized furnace which is designed to incinerate marine waste as incineration is higher than a set temperature. When it gets low,
A method and an apparatus for controlling the operation of a marine waste incineration fluidized-bed furnace for controlling the operation of stopping the injection of fuel oil from a submerged burner located in the vicinity of the portion by the use of the fuel oil caused by poor flow conditions In the initial stage, obstacles such as solidification of the fluidized bed caused by poor combustion can be eliminated, eliminating the need to stop the operation of the fluidized furnace and remove the solidified portion. Heated flowing air is sent through the diffuser pipe, and fuel oil is blown into the fluidized bed by a plurality of sand burners installed on the side walls of the fluidized bed to incinerate marine waste as incineration. The sand extracted from the lower part of the fluidized bed of the fluidized furnace is
Remove incombustibles from the sand so that it can be circulated and supplied,
When the sand circulation is stopped, if the pressure difference between the furnace internal pressure and the inlet pressure of the diffuser pipe exceeds a set value, the operation control of the marine waste incineration fluidized furnace for controlling the operation to perform the sand circulation is performed. By using the method and the apparatus, it is possible to cope with a sudden deterioration of the fluidized state of the fluidized bed, and it is possible to operate the sand circulation system only for a minimum necessary time, and to replace the wear-resistant parts. Frequency can be kept to a minimum,
The heated fluidized air is sent through a diffuser to the fluidized bed made of sand, and fuel oil is blown into the fluidized bed by a plurality of sand burners installed on the side walls of the fluidized bed to incinerate marine waste as incineration. After removing incombustibles from the sand extracted from the lower part of the fluidized bed of the fluidized furnace, the marine waste incineration that controls the operation so that shells are further removed from the sand and then returned to the fluidized bed With the method and apparatus for controlling the operation of the fluidized-bed furnace, it is possible to prevent the volume of the fluidized bed from being increased by the shells, and therefore, it is possible to improve the efficiency of incineration of marine waste by the fluidized-bed furnace. Demonstrates excellent effects.

[Brief description of the drawings]

FIG. 1 is a schematic view of an entire incineration facility showing an embodiment of an operation control device of a fluidized-bed furnace for marine waste incineration according to the present invention.

FIG. 2 is a schematic view showing another embodiment of the present invention.

FIG. 3 is a view taken in the direction of arrows AA in FIG. 2;

FIG. 4 is a schematic diagram showing still another embodiment of the present invention.

FIG. 5 is a schematic view showing still another embodiment of the present invention.

6 shows a rough sand separator used in the apparatus of FIG. 5,
(A) is a cut side view, and (B) is a partial plan view of (A).

7 shows an example of a fine sand separator used in the apparatus shown in FIG. 5, (a) is a perspective view, and (b) is a plan view.

8 shows another example of the fine sand separator used in the apparatus of FIG. 5, wherein (a) is a cut side view and (b) is a front view.

FIG. 9 is a schematic diagram showing a recently proposed marine waste incineration facility.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fluidized bed 2 fluidized bed 4 incinerated material (marine waste) 8 discharge duct 9 duster 14 discharge duct 15 storage device 21 primary air (flowing air) 22 fuel oil pipe 23 fuel oil 24 burner in sand 39 sand circulation system 44, 44a, 44b closing damper 47 thermometer 48 controller 49 thermometer 50 control valve 51 burner control device 55 differential pressure transmitter 56 sand coarse separator 65 fine sand separator a sand b incombustibles c shells

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F23C 10/24 F23G 5/30 ZABE 10/02 7/00 ZABZ F23G 5/30 ZAB F23C 11/02 308 7/00 ZAB 311 (72) Inventor Mikio Qingtang 13-6 Shinmachi, Kanagawa-ku, Yokohama-shi, Kanagawa F-term (reference) in Keihin Sangyo Co., Ltd. 3K062 AA11 AB01 AC12 AC20 BA02 BB02 DA01 DA11 DB30 3K064 AA20 AB03 AC06 AC07 AC12 AC13 AD08 BA07 BB05

Claims (8)

[Claims] 1. In addition to feeding heated fluidized air through a diffuser tube to a fluidized bed made of sand, fuel oil is blown into the fluidized bed by a plurality of sand burners installed on the side walls of the fluidized bed portion to produce incinerated material. When the operation of the fluidized-bed furnace in which marine waste is incinerated is stopped, the discharge port of a duster for supplying the incinerated material to the fluidized bed and the incinerated material to be sent to the duster via a conveyor are provided. An operation control method of a fluidized-bed incinerator for marine wastes, comprising controlling operation so as to close an outlet of a storage device for storing marine waste. 2. A heated fluidized air is fed into a fluidized bed made of sand through an air diffuser, and fuel oil is blown into the fluidized bed by a plurality of sand burners installed on the side walls of the fluidized bed portion to produce incinerated material. When the temperature of each part of the fluidized bed of the fluidized-bed furnace in which the marine waste is incinerated becomes lower than a set temperature, the injection of fuel oil from the sand burner located near the part is stopped. Control method for marine waste incineration fluidized-bed furnace that controls the operation as described above. 3. A heated fluidized air is fed into a fluidized bed made of sand through an air diffuser, and a fuel oil is blown into the fluidized bed by a plurality of sand burners installed on the side walls of the fluidized bed portion so as to be incinerated. The sand extracted from the lower part of the fluidized bed of a fluidized furnace which is designed to incinerate marine waste, so that incombustibles can be removed from the sand so that it can be circulated, and when sand circulation is stopped, An operation control method for a marine waste incineration fluidized-bed furnace, wherein the operation is controlled so that sand circulation is performed when the pressure difference between the furnace pressure and the inlet pressure of the air diffuser exceeds a set value. 4. In addition to feeding heated fluidized air through a diffuser tube to a fluidized bed made of sand, fuel oil is blown into the fluidized bed by a plurality of sand burners installed on the side walls of the fluidized bed portion, thereby producing incinerated material. After removing incombustibles from the sand extracted from the lower part of the fluidized bed of a fluidized-bed furnace in which marine waste is incinerated, the operation is controlled so that shells are further removed from the sand and then returned to the fluidized bed. A method for controlling the operation of a fluidized-bed furnace for incineration of marine wastes, comprising: 5. In addition to feeding heated fluidized air through a diffuser tube to a fluidized bed made of sand, fuel oil is blown into the fluidized bed by a plurality of sand burners installed on the side walls of the fluidized bed portion to produce incinerated material. Closing dampers are installed in two upper and lower stages in the discharge duct of a feeder for supplying incinerated material to the fluidized bed of a fluidized-bed furnace in which marine waste is incinerated, and the conveyor is connected to the duster. A closing damper is installed in the discharge duct of the storage device that stores the incinerated matter to be transported through the thermometer, and a thermometer for detecting the temperature of the fluidized bed, and a fluidized-bed furnace based on the value detected by the thermometer. An operation control device for a marine waste incineration fluidized-bed furnace, comprising: a controller configured to instruct the closing dampers to close when an operation suspension due to a temperature drop is detected. 6. In addition to feeding heated fluidized air through a diffuser tube to a fluidized bed made of sand, fuel oil is blown into the fluidized bed by a plurality of sand burners installed on the side walls of the fluidized bed portion, and the incinerated material is produced. A control valve is provided in each of the fuel oil pipes of each of the submerged burners of the fluidized-bed furnace in which marine waste is incinerated, and a thermometer for detecting a fluidized-bed temperature is provided near each submerged-burner in the fluidized bed. Each of which is provided with a controller for instructing to close the control valve for the submerged burner corresponding to a place where the fluidized bed temperature is abnormally reduced. Control device. 7. In addition to sending heated fluidized air through a diffuser tube to a fluidized bed made of sand, fuel oil is blown into the fluidized bed by a plurality of sand burners installed on the side walls of the fluidized bed portion, and the incinerated material is A sand circulating system for removing sand extracted from the lower part of the fluidized bed of the fluidized bed furnace for incineration of marine waste to remove incombustibles by a sand separator and return the sand to the fluidized bed; When the circulation system is stopped, the pressure difference between the furnace internal pressure and the inlet pressure of the diffuser tube is obtained, and a differential pressure transmitter that starts the sand circulation system when the pressure difference exceeds a set value is provided. An operation control device for a fluidized-bed furnace for incineration of marine waste, comprising: 8. In addition to feeding heated fluidized air through a diffuser tube to a fluidized bed of sand, fuel oil is blown into the fluidized bed by a plurality of sand burners installed on the side walls of the fluidized bed portion, and the incinerated material is A sand circulation system is provided for returning the sand extracted from the lower part of the fluidized bed of the fluidized bed of a fluidized furnace for incineration of marine waste to the fluidized bed. A sand coarse separator for separating and removing the material, and a sand fine separator for separating and removing shells contained in the sand separated by the sand coarse separator, and circulating the sand from which the shells have been removed by sand circulation. An operation control device for a marine waste incineration fluidized-bed furnace, wherein the operation control device has a configuration to be returned to the system.