JP7249685B2 - Incinerator cleaning method - Google Patents

Description

The present invention relates to an incinerator cleaning method.

In waste disposal facilities, incinerators are used to incinerate collected general wastes and industrial wastes. When incinerating waste, clinker is generated in the incinerator and sticks to the inner wall of the incinerator. Clinker is produced by melting ash at localized high temperatures, entraining incombustible materials such as metal, glass wool, plastic, etc., and becoming large, and sticks to the refractory materials that make up the incinerator.

Therefore, the clinker stuck in the incinerator is removed periodically. In general, clinker is removed manually by building scaffolding in an incinerator and using blasting or tools such as rods by workers.

In addition, a method of drilling a hole in the clinker and placing an expanding crushing agent in the hole to crush the clinker (for example, Patent Document 1), and an incinerator equipped with a clinker removing device that injects an injection medium to remove the clinker. (For example, Patent Document 2), a method in which a device that generates running water is arranged in an incinerator to prevent the formation of clinker, and the running water comes into contact with the accumulated clinker, destroying the clinker by heat shock and peeling it off ( Various means for removing clinker have been proposed, such as Patent Document 3).

JP-A-61-11596 JP 2010-243122 A JP-A-2008-82660

The method of Patent Literature 1 requires drilling a hole for each clinker and arranging an expanding crushing agent in the hole, so it is difficult to say that it is efficient. Moreover, in Patent Documents 2 and 3, since an incinerator incorporating a clinker removing device is required, it cannot be used in existing incinerators.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its object is to provide an incinerator cleaning method that can be applied to existing incinerators and that can effectively remove clinker. It is in.

The incinerator cleaning method according to the present invention comprises:
A step of closing the opening of the incinerator;
placing an agitating device in the incinerator;
A step of placing a microbubble generator in the incinerator;
filling the incinerator with a clinker-dissolving agent-containing liquid;
A step of removing clinker from the inner wall of the incinerator by driving the microbubble generator and the stirring device.
It is characterized by

Moreover, it is preferable to arrange the stirring device at the bottom of the incinerator.

Moreover, it is preferable to dispose the microbubble generator at the bottom of the incinerator.

ADVANTAGE OF THE INVENTION According to this invention, the incinerator cleaning method which can be applied also in the existing incinerator and can remove a clinker effectively can be provided.

It is a schematic block diagram of a stoker-type incinerator. It is a figure explaining an incinerator washing method.

The incinerator cleaning method according to the present embodiment includes a step of closing an opening of the incinerator (blocking step), a step of arranging a microbubble generator in the incinerator (a microbubble generator arranging step), and an incinerator a step of placing a stirring device in the incinerator (a stirring device placement step); a step of filling the incinerator with a clinker-dissolving agent-containing liquid (clinker-dissolving agent-containing liquid filling step); and driving the fine bubble generator and the stirring device, and a step of removing clinker from the inner wall of the incinerator (clinker removing step).

A stoker-type incinerator, which is widely used in garbage incineration facilities, will be described below as an example of the incinerator. Here, as shown in FIG. 1, the stoker-type incinerator 10 includes a hopper 11 into which waste is put, a supply feeder 12 that supplies waste to the combustion chamber, a combustion chamber 13, a stoker 14, and a fan that feeds combustion gas. Boxes 15, 16, 17, ash chute 18, boiler 19, falling ash conveyor 20, ash extrusion device 21, ash pit 22, wind boxes 15, 16, 17, connecting pipes connecting ash chute 18 and falling ash conveyor 20 23.

The closing step is a step of closing the opening of the incinerator so that the clinker-dissolving agent-containing liquid does not leak when the incinerator is filled with the clinker-dissolving agent-containing liquid, which will be described later. The closing method may be performed by means of closing means according to each opening location. For example, depending on the structure of the incinerator and the location of the opening, select and apply a method of closing the opening by placing a blocking member such as a shield plate or packing, or a method of filling and hardening the joint material to close the opening. do it. The openings of the stoker-type incinerator 10 include the waste supply point where the waste is fed into the combustion chamber 13 by the supply feeder 12, the lower portions of the wind boxes 15, 16, 17, the lower portion of the ash chute 18, and the like. shows an example in which the opening of is blocked by shielding plates C1 and C2. Here, the connection pipe 23 connecting the wind boxes 15, 16, 17 and the fallen ash conveyor 20 is removed, and the shielding plate C2 is arranged between the wind boxes 15, 16, 17 and the fallen ash conveyor 20. is blocked by In addition, if there are other openings such as supply ports for supplying secondary combustion gas to the combustion chamber 13, those openings are also appropriately closed.

In the stirring device arrangement step, the stirring device 30 is arranged inside the incinerator. As the stirring device 30, any system may be used as long as the clinker-dissolving agent-containing liquid can be sufficiently stirred in the incinerator. A general stirring device 30 that rotates stirring blades such as inclined paddle blades can be used.

Here, one stirring device 30 is arranged on the bottom surface of the incinerator. can be set according to the internal structure of the incinerator, the use of the agitator to be used, and the like.

In the microbubble generator arrangement step, the microbubble generator 40 is arranged inside the incinerator. The microbubble generator 40 may be of any type, such as an ultrasonic method, a swirling flow method, a pressurized dissolution method, or a micropore method, as long as it can generate microbubbles. Microbubbles to be generated may be microbubbles of 100 μm or less or nanobubbles of 1 μm or less. The micro-bubble generator 40 may be placed anywhere in the incinerator, and examples of the placement position include the bottom of the incinerator and the lower portion of the side wall.

In the clinker-dissolving agent-containing liquid filling step, the incinerator is filled with the clinker-dissolving agent-containing liquid. The clinker-dissolving agent-containing liquid may be filled up to a height where the generated clinker is buried. Here, the clinker-dissolving agent-containing liquid is filled from the hopper 11 . The clinker-dissolving agent-containing liquid may chemically react with the clinker formed on the inner wall of the incinerator to decompose the clinker. In an incinerator, clinker containing various components is produced depending on the waste to be incinerated. For example, silica component clinker based on _SiO2 , calcium component clinker based on calcium bicarbonate or calcium chloride, There are magnesium component clinker based on magnesium hydrogen and magnesium chloride. Therefore, as the clinker-dissolving agent-containing liquid, a liquid that softens these components and allows other clinker mixed therewith to be peeled off and removed from the inner wall of the incinerator may be used. Examples of the clinker-dissolving agent-containing liquid include aqueous solutions in which SiO ₂ , Na ₂ O, B ₂ O _{3 ,} Ag ₂ O, Al ₂ O _{3 ,} MgO, K ₂ CO ₃ , etc. are dissolved in water. A commercially available treatment liquid used for circulating cooling water or a solution obtained by dissolving a treatment agent in water may be used.

In the clinker removal step, the stirring device 30 and the microbubble generator 40 arranged in the incinerator are driven. Microbubbles generated from the microbubble generator 40 and the clinker-dissolving agent are circulated in the incinerator by the stirring device 30, and the clinker is efficiently removed.

The clinker is removed by the clinker-dissolving agent-containing liquid. By generating microbubbles, microbubbles enter into small gaps to adhere to dirt and remove it, or to float and separate dirt that occurs in water. The impact can produce an impact pressure action that acts against surrounding dirt. Effective decomposition and removal of clinker can be achieved by combining the effects of the clinker-dissolving agent-containing liquid, stirring, and microbubbles.

After removing the clinker, the fine bubble generator 40 and the stirring device 30 are stopped. Then, by removing the shielding plate C2 used to close the opening of the incinerator, the clinker-dissolving agent-containing liquid containing the removed clinker is dropped from the ash chute 18 and the wind boxes 15, 16, 17, and the fallen ash is It is discharged through a conveyor 20, an ash extruder 21 and an ash pit 22. Then, the shielding plate C1, the microbubble generator 40 and the stirring device 30 are removed.

In the incinerator cleaning method of this embodiment, the clinker can be chemically decomposed and the incinerator can be cleaned. Since scaffolding is not built in the incinerator and workers manually remove clinker, the burden on workers and dangerous work can be reduced, and manual labor is unnecessary, so the incinerator is low cost. can be washed. It is also applicable to existing incinerators.

10 Stoker type incinerator 30 Stirrer 40 Fine bubble generator C1 Shielding plate C2 Shielding plate

Claims (3)

A step of closing the opening of the incinerator;
placing an agitating device in the incinerator;
A step of placing a microbubble generator in the incinerator;
filling the incinerator with a clinker-dissolving agent-containing liquid;
A step of removing clinker from the inner wall of the incinerator by driving the microbubble generator and the stirring device.
An incinerator cleaning method characterized by: placing the agitator at the bottom of the incinerator;
The incinerator cleaning method according to claim 1, characterized in that: placing the microbubble generator at the bottom of the incinerator;
The incinerator cleaning method according to claim 1, characterized in that:

Images