JP3041618B1 - Dust recovery device for incinerator - Google Patents

Abstract

An object of the present invention is to facilitate disposal processing of dust removed from exhaust gas, reduce unnecessary labor, processing time and processing cost, and reliably prevent dust (harmful substances) from leaking to the outside. . A dust settling tank provided below a dust collecting section;
A collection tank 5 for storing the dust Ms, a transfer screw 6 having a carry-in side 6i facing the bottom of the dust settling tank 4 and a carry-out side 6o facing the inside of the collection tank 5, and a transfer covering the transfer screw 6. A dust transport section 8 composed of a tube 7 and a rotation drive section 9 for rotating the transport screw 6 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collecting apparatus for an incinerator provided with a dust collecting section for washing and cooling exhaust gas by injecting a shower from a scrubber nozzle.

[0002]

2. Description of the Related Art Conventionally, various types of incinerators for incinerating incinerated materials such as household waste and industrial waste are known, and in particular, relatively medium-scale incineration installed in companies and hospitals. The furnace is provided with an exhaust gas treatment unit for treating exhaust gas (smoke) discharged from the combustion chamber. In the exhaust gas treatment section,
Mainly, high-temperature exhaust gas generated during incineration is passed, and exhaust gas is washed and cooled by jetting showers from the plurality of scrubber nozzles to the passing exhaust gas.

[0003] By the way, harmful substances such as dioxins generated when burning plastics and the like and giving to ecosystems have become a social problem. The source of such harmful substances is the above-mentioned conventional incinerator. In many cases, leakage of harmful substances from incinerators must be reliably prevented.

However, in the above-mentioned conventional incinerator, it is difficult to dispose of the dust removed from the exhaust gas by washing, which consumes unnecessary labor, processing time and processing cost, and also emits dust (harmful substances) to the outside. There was a problem that it was not possible to reliably prevent the leakage of water.

The present invention has been made to solve the problems existing in the prior art, and makes it easy to dispose of dust removed from exhaust gas, thereby reducing unnecessary labor, processing time and processing cost. Accordingly, it is an object of the present invention to provide a dust collection device for an incinerator, which is capable of reliably preventing dust (hazardous substances) from leaking to the outside.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a dust collecting apparatus 1 for an incinerator provided with a dust collecting section 3 for injecting a shower S from scrubber nozzles 2 to clean and cool exhaust gas G. At the time of construction, the dust settling tank 4 communicated below the dust collecting section 3 through a relatively thin communicating section 31.
And a collection tank 5 configured in a sealed shape for storing dust Ms
And the transfer screw 6 having the carry-in side 6i facing the bottom of the dust settling tank 4 and the carry-out side 6o facing the inside of the collection tank 5, and covering the carry screw 6 and connecting the carry-out port 7o at the carry-out side with the dust. It is provided with a dust transport section 8 comprising a transport pipe 7 positioned above the liquid level Lu on the settling tank 4 side, and a rotary drive section 9 for rotating the transport screw 6.

[0007] Thus, the shower S (neutralized solution) after washing the exhaust gas G falls into the dust sedimentation tank 4 and is removed from the exhaust gas G contained in the shower S at the bottom of the dust sedimentation tank 4. The deposited dust Ms precipitates. On the other hand, the dust settling tank 4
At the bottom of, the carrying side 6i of the conveying screw 6 faces,
If the transport screw 6 is rotationally driven by the rotary drive unit 9,
The precipitated paste-like dust M is transported in the transport pipe 7 by the transport screw 6, and is collected in the recovery tank 5 from the outlet 7 o of the transport pipe 7. The outlet 7o of the transfer pipe 7
Is located above the liquid level Lu on the dust settling tank 4 side, so that the neutralizing liquid is prevented from entering the collection tank 5 from the dust settling tank 4 side.

[0008]

Next, preferred embodiments according to the present invention will be described in detail with reference to the drawings.

First, the overall configuration of the incinerator H including the configuration of the dust collection apparatus 1 according to the present embodiment will be described with reference to FIGS.

In the incinerator H, 50 is a primary combustion chamber Cf
The primary combustion unit 50 has an incineration ash accommodating chamber Ca at the lower portion inside the primary combustion unit 50 via a roastle 51. A charging device 52 for charging the incineration material into the primary combustion chamber Cf is attached to a front portion of the primary combustion unit 50. The loading device 52 has an outer door 53o and an inner door 53i that open and close alternately. Reference numeral 54 denotes a watering device for spraying the incineration ash Mf in the incineration ash storage chamber Ca so as not to be scattered when the incineration ash Mf is taken out, 55 a single primary combustion burner facing the primary combustion chamber Cf, 56 are a plurality of air supply units for supplying air to the primary combustion chamber Cf.

Reference numeral 57 denotes a cyclone type secondary combustion chamber C
The upper portion of the side portion of the secondary combustion unit 57 and the upper portion of the side portion of the primary combustion unit 50 are connected to each other by a conduit 58. The conduit 58 has two secondary combustion burners 5 directed toward the secondary combustion chamber Cs.
9,59.

On the other hand, reference numeral 60 denotes an exhaust gas treatment unit adjacent to the secondary combustion unit 57. The exhaust gas treatment unit 60 includes a dust collecting section (dust collecting tower) 3 and a dehumidifying section (dehumidifying tower) 62 therein. 3 and a neutralization tank 63 below the dehumidifying section 62.
The lower end opening of the dust collecting section 3 and the dehumidifying section 62 communicate with each other via a neutralization tank 63. The neutralization tank 63 also communicates with the bottom of the secondary combustion unit 57. The upper surface of the dust collecting section 3 is connected to the secondary combustion unit 57 via the curved smoke conduit 64, and the entrance of the smoke conduit 64 is particularly exposed to an intermediate position of the secondary combustion chamber Cs. The dust collecting unit 3 employs a scrubber system, and a plurality of shower units 65 are provided inside. One shower unit 65 (the same applies to other shower units) includes a plurality of scrubber nozzles 2 for spraying a shower (neutralizing solution) S in a mist state in a horizontal direction, and an umbrella-shaped guide 66 provided at the lower end of the shower unit 65. Having. Further, the dehumidifying section 62 has water drop removing plates 67 arranged in multiple layers therein, thereby forming a complicated flow path.

On the other hand, a neutralizing solution L is contained in the neutralizing tank 63. As shown in FIG. 1, this neutralizing solution L
Are supplied to the scrubber nozzles 2 by the circulating mechanism 22 having the nozzle 1 and are ejected from the scrubber nozzles 2.
The neutralization tank 63 has a pH for detecting the pH of the neutralization solution L.
A pH meter 23 and a neutralizing agent supply unit 24 for supplying a neutralizing agent are provided.
Connect to As a result, the pH of the neutralized solution L is adjusted to pH 2
3, the neutralizing agent is supplied from the neutralizing agent supply unit 24 so as to have a constant pH (usually pH 7), and water is supplied as necessary.

Further, the dust collecting apparatus 1 according to the present embodiment is attached to the neutralization tank 63. As shown in FIG. 1, the dust collection device 1 includes a dust settling tank 4 disposed below the dust collection unit 3, that is, directly below the neutralization tank 63, and a bottom portion of the neutralization tank 63 and the dust settling tank 4. Are connected by a relatively thin communicating portion 31. On the other hand, 5 is a collection tank that stores the dust Ms,
Construct in a closed state. In addition, the dust settling tank 4 and the collection tank 5
A dust transport section 8 including a transport screw 6 and a transport pipe 7 that covers the transport screw 6 is provided between the dust screws. in this case,
The carry-in side of the conveying pipe 7 is disposed below the dust settling tank 4 so that the carry-in side 6i of the conveying screw 6 faces the bottom of the dust settling tank 4, and the carry-out port 7o on the carry-out side of the conveying pipe 7 is
By being positioned at the upper end of the collection tank 5, the unloading side 6 o of the transport screw 6 faces the inside of the collection tank 5.
At this time, the transport pipe 7 is inclined, and the carry-out port 7o is positioned higher than the liquid level Lu of the neutralized liquid L in the neutralization tank 63 which is the liquid level Lu on the dust precipitation tank 4 side. Thus, the neutralization liquid L is prevented from entering the collection tank 5 from the dust precipitation tank 4 side. In addition, the bottom part of the dust settling tank 4 and the upper part of the conveying pipe 7 are connected by a relatively thin communicating part 32. In addition, the bottom surface of the neutralization tank 63 and the bottom surface of the dust precipitation tank 4 are formed as inclined surfaces with respect to the communication part 31 and the communication part 32, respectively.

Further, on the upper surface of the recovery tank 5, a rotary drive unit 9 having a built-in drive motor and a speed reduction mechanism is provided.
The rotation drive unit 9 is connected to the control unit 25, and the rotation output shaft of the rotation drive unit 9 is connected to one end of the transport screw 6.

On the other hand, a chimney 68 is erected on the upper surface of the dehumidifying section 62. In addition, 69 is an air blower attached to the chimney 68, and 70 is a heat storage tank.

Next, the overall operation of the incinerator H including the operation of the dust collection apparatus 1 according to the present embodiment will be described with reference to the drawings.

First, the material to be incinerated is charged by the charging device 52 into the primary combustion chamber Cf. In FIG. 2, an arrow W indicates a charging path of the incineration material. Then, the incineration material is primarily incinerated in the primary combustion chamber Cf. In this case, the primary combustion burner 5
5 are ignited, and air is supplied from the plurality of air supply units 56. Note that the incineration ash Mf is accumulated in the incineration ash storage chamber Ca through the roaster 51.

On the other hand, exhaust gas (smoke) G generated during incineration
Is sucked to the chimney 68 side by the induced draft by the blower 69. 2, the arrow F indicates the direction of the airflow. Therefore, the exhaust gas G in the primary combustion chamber Cf flows into the secondary combustion chamber Cs through the conduit 58. In this case, the exhaust gas G passing through the conduit 58 is supplied to the two secondary combustion burners 59, 59.
, And is secondarily incinerated in the cyclone type secondary combustion chamber Cs. Thereby, harmful substances such as dioxin are completely decomposed. In the secondary combustion chamber Cs, a part of the dust falls into the neutralized liquid L stored in the bottom.

Further, the exhaust gas G in the secondary combustion chamber Cs is:
The dust flows into the dust collecting section 3 through the smoke conduit 64. In the scrubber type dust collector 3, a shower (neutralizing solution) sprayed from the scrubber nozzles 2 provided in the shower units 65.
S is blown to the exhaust gas G, thereby removing the dust in the exhaust gas G and cooling the exhaust gas G.
The exhaust gas G from which the dust has been removed flows into the dehumidifying section 62, and after the moisture in the exhaust gas G is removed, is discharged from the chimney 68 into the atmosphere. Also, the shower S sprayed from the scrubber nozzles 2 and the water (water droplets) removed by the dehumidifying unit 62
Falls into the neutralization tank 63.

On the other hand, the shower S dropped into the neutralization tank 63
Since the (neutralized liquid L) contains dust removed from the exhaust gas G, the dust passes through the neutralization tank 63 and the communication part 31 and precipitates in the dust precipitation tank 4. Further, the dust Ms settled in the dust settling tank 4 enters the inside of the transport pipe 7 through the communication part 31. Therefore, if the control unit 25 controls the rotation of the rotation drive unit 9 and rotates the transport screw 6, the settled paste-like dust Ms is transported by the transport screw 6 to the transport pipe 7.
The inside is conveyed to the carry-out side, and is collected into the collection tank 5 from the carry-out port 7o of the transfer pipe 7. Therefore, according to the dust collection apparatus 1 according to the present embodiment, the dust Ms can be automatically collected, and the disposal of the dust Ms removed from the exhaust gas becomes easy, so that unnecessary labor, processing time, and processing cost are used. And the leakage of dust (harmful substances) to the outside is surely prevented.

When the incineration process is completed, water is sprayed from the water spray device 54 onto the incineration ash Mf accumulated in the incineration ash storage chamber Ca. Thereby, when taking out the incineration ash Mf outside, for example, even if the wind is strong, scattering of the incineration ash Mf is prevented.

The embodiment has been described in detail above.
The present invention is not limited to such an embodiment,
The configuration, shape, material, quantity, etc. of the details can be arbitrarily changed, added, or deleted without departing from the gist of the present invention. For example, the dust collection device 1 may be attached to the incineration ash storage chamber Ca provided in the lower part inside the primary combustion unit 50. Also in this case, the incinerated ash Mf after watering can be similarly recovered.

[0024]

As described above, the dust collecting apparatus for an incinerator according to the present invention comprises a dust sedimentation tank which is communicated below a dust collecting section through a relatively thin communicating part, and a dust-storing tank for storing dust. The configured recovery tank, the transport screw facing the carry-in side at the bottom of the dust sedimentation tank, and the transport side facing the discharge side inside the recovery tank, and covering the transport screw and setting the discharge port on the discharge side to the dust sedimentation tank side. Dust transport unit consisting of a transport pipe located above the liquid level of the above and a rotary drive unit that rotates the transport screw, automatic collection of dust is possible, and disposal of dust removed from exhaust gas can be performed. By making it easier, unnecessary labor, processing time and processing cost can be reduced, and in addition, there is a remarkable effect that leakage of dust (harmful substances) to the outside can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a dust collection device according to a preferred embodiment of the present invention,

FIG. 2 is a schematic overall configuration diagram showing the principle of an incinerator,

FIG. 3 is an overall external view of the incinerator,

FIG. 4 is a schematic overall perspective view showing a layout of the incinerator;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dust collection apparatus 2 ... Scrubber nozzle 3 Dust collection part 4 Dust sedimentation tank 5 Collection tank 6 Transfer screw 6i Transfer screw carry-in side 6o Transfer screw discharge side 7 Transfer pipe 7o Transfer pipe outlet 8 Dust transfer part 9 Rotary drive Part 31 communication part S shower G exhaust gas Ms dust Lu liquid level

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23J 1/02 F23G 5/44 ZAB F23J 15/04

Claims (1)

(57) [Claims] 1. A dust collection device for an incinerator provided with a dust collector for cleaning and cooling exhaust gas by injecting a shower from a scrubber nozzle, wherein the dust collector is communicated below the dust collector through a relatively thin communication part. A dust collection tank, a collection tank configured in a sealed shape for storing dust, a transfer screw having a loading side facing the bottom of the dust precipitation tank, and a delivery side facing the inside of the collection tank, and A dust transport section comprising a transport pipe that covers the transport screw and a transport outlet on the unloading side is positioned above the liquid level on the dust settling tank side, and a rotary drive section that rotationally drives the transport screw. Dust collection device of incinerator.