JPS6014114Y2 - Multi-drum sludge incinerator - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a multi-drum sludge incinerator.

Conventionally, rotary kilns or vertical multistage furnaces have been used to incinerate sludge.

A rotary kiln incinerates sludge while transporting it within a rotating drum, but in order to be able to incinerate sludge with a high water content, it requires large-scale equipment, and the larger the drum, the greater the heat loss. There's a problem.

In a vertical multistage furnace, a shaft equipped with a scraper is passed through the center of a circular vertical multistage shelf, and the sludge is sequentially dried and incinerated from the top, and then discharged as ash from the bottom.

However, the sludge sending mechanism by the scraper is strained due to thermal deformation, etc., and the equipment tends to be large-scale, such as a shaft.

In addition, ash tends to remain in a portion of each column, making maintenance troublesome.

The purpose of this invention is to provide a sludge incinerator that uses a multi-drum type to reduce equipment space, reduce heat radiation loss, improve thermal efficiency, and facilitate maintenance. It is.

Therefore, in the present invention, a pair of rotating drums each having a plurality of cylindrical portions with one end closed and having different diameters are fitted together from the other end side, and the cylindrical portions are moved inward and outward at intervals in the radial direction. At the same time as polymerization, the pair of rotating drums are supported rotatably around a horizontal axis, and a sludge supply port is provided at the axial center of one end wall of one of the rotating drums, and a cylindrical portion located at the outermost side and a cylindrical portion located inside thereof. A burner is provided opposite to the opening of the annular space between the two rotary drums, and an exhaust gas outlet is provided at the axial center of one end wall of the other rotating drum.

An embodiment of the present invention will be described below based on the drawings.

1.2 is a pair of rotating drums.

These rotating drums 1 and 2 are constructed as double cylinders,
Inner and outer cylindrical portions 3a and 3b have different diameters from each other.

4at4b, and one end is closed with end walls 5 and 6.

7 is a fireproof material provided on the end walls 5 and 6.

The other parts of the rotating drums 1, 2 are preferably made of steel, particularly heat-resistant cast steel.

The circumferential rotating drums 1 and 2 are fitted into each other from the other end side, that is, from the non-closed end side, to form their cylindrical parts 3a, 3b, 4a.
, 4b are alternately loosely fitted and are supported by a suitable support device so as to be rotatable around the same horizontal axis.

The outermost cylindrical portion 3b is supported by a socket roller 8.

Further, the rotating drums 1 and 2 are connected to a rotational drive device that rotates them independently or synchronously.

Arrows "a" and "b" in FIG. 2 indicate the rotational directions of the rotating drums 1 and 2, respectively.

Note that the support and drive system for the rotating drums 1 and 2 is preferably such that the rotating drums 1 and 2 can be removed from each other to both sides for maintenance.

A sludge supply tube 9 constituting a sludge supply port is provided at the axial center of the end wall 5 of one rotary drum 1 and protrudes inward.
A screw feeder 10 for supplying sludge is installed in the sludge supply cylinder 9.
One end of the is inserted.

The screw feeder 10 has a casing pipe 11 and a screw 12.

The sludge supply port 9a at the tip of the sludge supply tube 9 is located closer to the end wall 6 of the other rotating drum 2 than the center.

An exhaust gas outlet 1 is provided at the axial center of the end wall 6 of the other rotating drum 2.
3 is provided, and the exhaust gas outlet 13 is connected to a suction device such as an induction fan via a suction pipe so that negative pressure operation can be performed within the rotating drums 1 and 2.

Each cylindrical part 3at 3bt 4a of rotating drum 1゜2
A plurality of sludge feeding blades 14 are provided at appropriate intervals in the circumferential direction on the inner surface of t4b.

The sending blade 14 has one end and the other end, and the one end is located on the end wall side of each cylindrical part 3a, 3b, 4a, 4b, and the other end is located at each cylindrical part 3at, 3bt, 4a,
The rotary drum 4b is located at the non-closed end side and is provided obliquely so that the other end portion is located rearward in the rotational direction of the rotary drums 1 and 2 than the one end portion.

For this reason, the sludge is transferred to each cylindrical portion 3at 3b, 4a, 4b.
can be sent from the closed end to the non-closed end.

The space between the outer cylindrical portion 3b of one rotating drum 1 and the outer cylindrical portion 4b of the other rotating drum 2 is closed off by an annular seal plate 15 whose position is fixed.

A hole communicating with an ash discharge hopper 16 is provided at the lowest part of the seal plate 15, and a rotary valve 11 is provided at the outlet of the ash discharge hopper 16 to air-seal the inside of the rotating drums 1 and 2 as much as possible.

Further, a burner 18 is provided in the hole at the bottom of the seal plate 15 .

The burner 18 is provided in a direction facing the feeding blades 14 provided diagonally, and injects a flame toward the sludge lifted up along the feeding blades 14.

Next, the operation of the above configuration will be explained.

The sludge supplied from the screw feeder 10 into the rotary drums 1 and 2 is transported by the feed blades 1 as the rotary drum 2 rotates.
4 moves to the left in FIG. 1 on the innermost cylindrical portion 4a and falls onto the cylindrical portion 3a of the rotating drum 1.

In FIG. 1, white arrows indicate the movement of sludge, and black arrows indicate the flow of exhaust gas.

Next, as the rotating drum 1 rotates, the sludge moves to the right while being stirred, and falls onto the outer cylindrical portion 4b of the rotating drum 2.

Through such repetition, the sludge reaches the outermost cylindrical part 3b of the rotating drum 1, where it is burned by the flame of the burner 18, and the ash produced by the combustion is discharged to the outside via the ash discharge hopper 16 and the rotary valve 17. be discharged.

As described above, the burner 18 injects the sludge countercurrently to the sludge rising up by the sending blade 14, thereby effectively burning the sludge.

If the sludge has a calorific value that allows it to self-combust, the burner 18 is used only during ignition.

The combustion gas of the sludge flows through the cylindrical parts 3a and 3 of the rotating drums 1 and 2.
b.

The sludge passes between 4a and 4b, dries the sludge on the way, and is finally drawn and discharged from the exhaust gas outlet 13 of the rotating drum 2 to the outside.

A is the incineration zone and B is the drying zone.

The rotational speed of the rotating drums 1 and 2 is set to a level that does not interfere with the combustion of sludge.

In the above embodiment, both the rotating drums 1 and 2 are double-layered, but they can be further multiplexed depending on the installation space and required thermal efficiency.

The sludge supply port 9a and the exhaust gas outlet 13 are connected to both rotating drums 1,
It may be provided on either side of 2.

The present invention can be implemented as described above, and the following effects can be obtained thereby.

■ Since it is a multiplex system using a pair of rotating drums, the surface area of the outermost cylindrical part is reduced, which reduces radiation heat loss and improves thermal efficiency.

Each rotating drum itself can be multiplexed to further improve thermal efficiency.

■ Since the sludge transfer distance is long, a sufficient drying zone is provided in addition to the combustion zone, ensuring reliable combustion.

■ Particularly in the drying zone, in addition to airflow drying, the effect of heat transfer drying from a heated rotating drum can also be expected.

■ Since it is a multi-drum type, the installation space is small.

■ Maintenance is easy because both paper drums can be removed on both sides.

- Appropriate agitation and transfer of sludge is possible by the rotation of the rotating drum, and transfer is more reliable than with conventional scrapers.

Therefore, no sludge or ash remains inside, and maintenance is easy from this point of view as well.

■ Since most of the rotating drum can be made of steel, it is possible to shorten the start-up time before and after operation, and the time after stopping.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being a sectional view and FIG.
The figure is a view taken along the line II in FIG. 1. 1, 2 @@@-6-Rotating drum, 3a, 3b, 4
a, 4b... Cylindrical part, 5, 6... End wall, 9a... Sludge supply port, 10... Screw feeder, 13...・Exhaust gas outlet, 14・
...Feeding blade, 15...Seal plate, 16
... Ash discharge hopper, 18 ... Burner.

Claims (1)

[Scope of utility model registration request] A pair of rotating drums each having a plurality of cylindrical portions each having a closed end and having different diameters are fitted together from the other end to overlap the cylindrical portions inwardly and outwardly at intervals in the radial direction. A rotating drum is rotatably supported around a horizontal axis, a sludge supply port is provided at the axial center of one end wall of one of the rotating drums, and an annular space is formed between the outermost cylindrical part and the inner cylindrical part. A multi-drum sludge incinerator characterized in that a burner is provided opposite to the opening of the rotary drum, and an exhaust gas outlet is provided at the axial center of one end wall of the other rotating drum.